| 1 | |
| 2 | |
| 3 | * f_mass_storage.c -- Mass Storage USB Composite Function
|
| 4 | *
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| 5 | * Copyright (C) 2003-2008 Alan Stern
|
| 6 | * Copyright (C) 2009 Samsung Electronics
|
| 7 | * Author: Michal Nazarewicz <[email protected]>
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| 8 | * All rights reserved.
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| 9 |
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| 10 |
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| 11 | |
| 12 | * The Mass Storage Function acts as a USB Mass Storage device,
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| 13 | * appearing to the host as a disk drive or as a CD-ROM drive. In
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| 14 | * addition to providing an example of a genuinely useful composite
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| 15 | * function for a USB device, it also illustrates a technique of
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| 16 | * double-buffering for increased throughput.
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| 17 | *
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| 18 | * For more information about MSF and in particular its module
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| 19 | * parameters and sysfs interface read the
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| 20 | * <Documentation/usb/mass-storage.rst> file.
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| 21 |
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| 22 |
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| 23 | |
| 24 | * MSF is configured by specifying a fsg_config structure. It has the
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| 25 | * following fields:
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| 26 | *
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| 27 | * nluns Number of LUNs function have (anywhere from 1
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| 28 | * to FSG_MAX_LUNS).
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| 29 | * luns An array of LUN configuration values. This
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| 30 | * should be filled for each LUN that
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| 31 | * function will include (ie. for "nluns"
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| 32 | * LUNs). Each element of the array has
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| 33 | * the following fields:
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| 34 | * ->filename The path to the backing file for the LUN.
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| 35 | * Required if LUN is not marked as
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| 36 | * removable.
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| 37 | * ->ro Flag specifying access to the LUN shall be
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| 38 | * read-only. This is implied if CD-ROM
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| 39 | * emulation is enabled as well as when
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| 40 | * it was impossible to open "filename"
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| 41 | * in R/W mode.
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| 42 | * ->removable Flag specifying that LUN shall be indicated as
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| 43 | * being removable.
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| 44 | * ->cdrom Flag specifying that LUN shall be reported as
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| 45 | * being a CD-ROM.
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| 46 | * ->nofua Flag specifying that FUA flag in SCSI WRITE(10,12)
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| 47 | * commands for this LUN shall be ignored.
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| 48 | *
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| 49 | * vendor_name
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| 50 | * product_name
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| 51 | * release Information used as a reply to INQUIRY
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| 52 | * request. To use default set to NULL,
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| 53 | * NULL, 0xffff respectively. The first
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| 54 | * field should be 8 and the second 16
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| 55 | * characters or less.
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| 56 | *
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| 57 | * can_stall Set to permit function to halt bulk endpoints.
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| 58 | * Disabled on some USB devices known not
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| 59 | * to work correctly. You should set it
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| 60 | * to true.
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| 61 | *
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| 62 | * If "removable" is not set for a LUN then a backing file must be
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| 63 | * specified. If it is set, then NULL filename means the LUN's medium
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| 64 | * is not loaded (an empty string as "filename" in the fsg_config
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| 65 | * structure causes error). The CD-ROM emulation includes a single
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| 66 | * data track and no audio tracks; hence there need be only one
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| 67 | * backing file per LUN.
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| 68 | *
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| 69 | * This function is heavily based on "File-backed Storage Gadget" by
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| 70 | * Alan Stern which in turn is heavily based on "Gadget Zero" by David
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| 71 | * Brownell. The driver's SCSI command interface was based on the
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| 72 | * "Information technology - Small Computer System Interface - 2"
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| 73 | * document from X3T9.2 Project 375D, Revision 10L, 7-SEP-93,
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| 74 | * available at <http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf>.
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| 75 | * The single exception is opcode 0x23 (READ FORMAT CAPACITIES), which
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| 76 | * was based on the "Universal Serial Bus Mass Storage Class UFI
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| 77 | * Command Specification" document, Revision 1.0, December 14, 1998,
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| 78 | * available at
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| 79 | * <http://www.usb.org/developers/devclass_docs/usbmass-ufi10.pdf>.
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| 80 |
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| 81 |
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| 82 | |
| 83 | * Driver Design
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| 84 | *
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| 85 | * The MSF is fairly straightforward. There is a main kernel
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| 86 | * thread that handles most of the work. Interrupt routines field
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| 87 | * callbacks from the controller driver: bulk- and interrupt-request
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| 88 | * completion notifications, endpoint-0 events, and disconnect events.
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| 89 | * Completion events are passed to the main thread by wakeup calls. Many
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| 90 | * ep0 requests are handled at interrupt time, but SetInterface,
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| 91 | * SetConfiguration, and device reset requests are forwarded to the
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| 92 | * thread in the form of "exceptions" using SIGUSR1 signals (since they
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| 93 | * should interrupt any ongoing file I/O operations).
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| 94 | *
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| 95 | * The thread's main routine implements the standard command/data/status
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| 96 | * parts of a SCSI interaction. It and its subroutines are full of tests
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| 97 | * for pending signals/exceptions -- all this polling is necessary since
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| 98 | * the kernel has no setjmp/longjmp equivalents. (Maybe this is an
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| 99 | * indication that the driver really wants to be running in userspace.)
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| 100 | * An important point is that so long as the thread is alive it keeps an
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| 101 | * open reference to the backing file. This will prevent unmounting
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| 102 | * the backing file's underlying filesystem and could cause problems
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| 103 | * during system shutdown, for example. To prevent such problems, the
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| 104 | * thread catches INT, TERM, and KILL signals and converts them into
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| 105 | * an EXIT exception.
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| 106 | *
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| 107 | * In normal operation the main thread is started during the gadget's
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| 108 | * fsg_bind() callback and stopped during fsg_unbind(). But it can
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| 109 | * also exit when it receives a signal, and there's no point leaving
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| 110 | * the gadget running when the thread is dead. As of this moment, MSF
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| 111 | * provides no way to deregister the gadget when thread dies -- maybe
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| 112 | * a callback functions is needed.
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| 113 | *
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| 114 | * To provide maximum throughput, the driver uses a circular pipeline of
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| 115 | * buffer heads (struct fsg_buffhd). In principle the pipeline can be
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| 116 | * arbitrarily long; in practice the benefits don't justify having more
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| 117 | * than 2 stages (i.e., double buffering). But it helps to think of the
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| 118 | * pipeline as being a long one. Each buffer head contains a bulk-in and
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| 119 | * a bulk-out request pointer (since the buffer can be used for both
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| 120 | * output and input -- directions always are given from the host's
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| 121 | * point of view) as well as a pointer to the buffer and various state
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| 122 | * variables.
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| 123 | *
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| 124 | * Use of the pipeline follows a simple protocol. There is a variable
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| 125 | * (fsg->next_buffhd_to_fill) that points to the next buffer head to use.
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| 126 | * At any time that buffer head may still be in use from an earlier
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| 127 | * request, so each buffer head has a state variable indicating whether
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| 128 | * it is EMPTY, FULL, or BUSY. Typical use involves waiting for the
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| 129 | * buffer head to be EMPTY, filling the buffer either by file I/O or by
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| 130 | * USB I/O (during which the buffer head is BUSY), and marking the buffer
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| 131 | * head FULL when the I/O is complete. Then the buffer will be emptied
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| 132 | * (again possibly by USB I/O, during which it is marked BUSY) and
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| 133 | * finally marked EMPTY again (possibly by a completion routine).
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| 134 | *
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| 135 | * A module parameter tells the driver to avoid stalling the bulk
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| 136 | * endpoints wherever the transport specification allows. This is
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| 137 | * necessary for some UDCs like the SuperH, which cannot reliably clear a
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| 138 | * halt on a bulk endpoint. However, under certain circumstances the
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| 139 | * Bulk-only specification requires a stall. In such cases the driver
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| 140 | * will halt the endpoint and set a flag indicating that it should clear
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| 141 | * the halt in software during the next device reset. Hopefully this
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| 142 | * will permit everything to work correctly. Furthermore, although the
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| 143 | * specification allows the bulk-out endpoint to halt when the host sends
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| 144 | * too much data, implementing this would cause an unavoidable race.
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| 145 | * The driver will always use the "no-stall" approach for OUT transfers.
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| 146 | *
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| 147 | * One subtle point concerns sending status-stage responses for ep0
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| 148 | * requests. Some of these requests, such as device reset, can involve
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| 149 | * interrupting an ongoing file I/O operation, which might take an
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| 150 | * arbitrarily long time. During that delay the host might give up on
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| 151 | * the original ep0 request and issue a new one. When that happens the
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| 152 | * driver should not notify the host about completion of the original
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| 153 | * request, as the host will no longer be waiting for it. So the driver
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| 154 | * assigns to each ep0 request a unique tag, and it keeps track of the
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| 155 | * tag value of the request associated with a long-running exception
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| 156 | * (device-reset, interface-change, or configuration-change). When the
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| 157 | * exception handler is finished, the status-stage response is submitted
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| 158 | * only if the current ep0 request tag is equal to the exception request
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| 159 | * tag. Thus only the most recently received ep0 request will get a
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| 160 | * status-stage response.
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| 161 | *
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| 162 | * Warning: This driver source file is too long. It ought to be split up
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| 163 | * into a header file plus about 3 separate .c files, to handle the details
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| 164 | * of the Gadget, USB Mass Storage, and SCSI protocols.
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| 165 |
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| 166 |
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| 167 |
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| 168 |
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| 169 |
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| 170 |
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| 171 | #include <linux/blkdev.h>
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| 172 | #include <linux/completion.h>
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| 173 | #include <linux/dcache.h>
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| 174 | #include <linux/delay.h>
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| 175 | #include <linux/device.h>
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| 176 | #include <linux/fcntl.h>
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| 177 | #include <linux/file.h>
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| 178 | #include <linux/fs.h>
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| 179 | #include <linux/kstrtox.h>
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| 180 | #include <linux/kthread.h>
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| 181 | #include <linux/sched/signal.h>
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| 182 | #include <linux/limits.h>
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| 183 | #include <linux/overflow.h>
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| 184 | #include <linux/pagemap.h>
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| 185 | #include <linux/rwsem.h>
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| 186 | #include <linux/slab.h>
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| 187 | #include <linux/spinlock.h>
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| 188 | #include <linux/string.h>
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| 189 | #include <linux/freezer.h>
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| 190 | #include <linux/module.h>
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| 191 | #include <linux/uaccess.h>
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| 192 | #include <linux/unaligned.h>
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| 193 |
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| 194 | #include <linux/usb/ch9.h>
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| 195 | #include <linux/usb/gadget.h>
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| 196 | #include <linux/usb/composite.h>
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| 197 |
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| 198 | #include <linux/nospec.h>
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| 199 |
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| 200 | #include "configfs.h"
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| 201 |
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| 202 |
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| 203 |
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| 204 |
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| 205 | #define FSG_DRIVER_DESC "Mass Storage Function"
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| 206 |
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| 207 | static const char fsg_string_interface[] = "Mass Storage";
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| 208 |
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| 209 | #include "storage_common.h"
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| 210 | #include "f_mass_storage.h"
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| 211 |
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| 212 |
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| 213 | static struct usb_string fsg_strings[] = {
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| 214 | {FSG_STRING_INTERFACE, fsg_string_interface},
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| 215 | {}
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| 216 | };
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| 217 |
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| 218 | static struct usb_gadget_strings fsg_stringtab = {
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| 219 | .language = 0x0409,
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| 220 | .strings = fsg_strings,
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| 221 | };
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| 222 |
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| 223 | static struct usb_gadget_strings *fsg_strings_array[] = {
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| 224 | &fsg_stringtab,
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| 225 | NULL,
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| 226 | };
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| 227 |
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| 228 |
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| 229 |
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| 230 | struct fsg_dev;
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| 231 | struct fsg_common;
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| 232 |
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| 233 |
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| 234 | struct fsg_common {
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| 235 | struct usb_gadget *gadget;
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| 236 | struct usb_composite_dev *cdev;
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| 237 | struct fsg_dev *fsg;
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| 238 | wait_queue_head_t io_wait;
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| 239 | wait_queue_head_t fsg_wait;
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| 240 |
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| 241 |
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| 242 | struct rw_semaphore filesem;
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| 243 |
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| 244 |
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| 245 | spinlock_t lock;
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| 246 |
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| 247 | struct usb_ep *ep0;
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| 248 | struct usb_request *ep0req;
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| 249 | unsigned int ep0_req_tag;
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| 250 |
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| 251 | struct fsg_buffhd *next_buffhd_to_fill;
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| 252 | struct fsg_buffhd *next_buffhd_to_drain;
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| 253 | struct fsg_buffhd *buffhds;
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| 254 | unsigned int fsg_num_buffers;
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| 255 |
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| 256 | int cmnd_size;
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| 257 | u8 cmnd[MAX_COMMAND_SIZE];
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| 258 |
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| 259 | unsigned int lun;
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| 260 | struct fsg_lun *luns[FSG_MAX_LUNS];
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| 261 | struct fsg_lun *curlun;
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| 262 |
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| 263 | unsigned int bulk_out_maxpacket;
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| 264 | enum fsg_state state;
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| 265 | unsigned int exception_req_tag;
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| 266 | void *exception_arg;
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| 267 |
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| 268 | enum data_direction data_dir;
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| 269 | u32 data_size;
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| 270 | u32 data_size_from_cmnd;
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| 271 | u32 tag;
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| 272 | u32 residue;
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| 273 | u32 usb_amount_left;
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| 274 |
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| 275 | unsigned int can_stall:1;
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| 276 | unsigned int free_storage_on_release:1;
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| 277 | unsigned int phase_error:1;
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| 278 | unsigned int short_packet_received:1;
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| 279 | unsigned int bad_lun_okay:1;
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| 280 | unsigned int running:1;
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| 281 | unsigned int sysfs:1;
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| 282 |
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| 283 | struct completion thread_notifier;
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| 284 | struct task_struct *thread_task;
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| 285 |
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| 286 |
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| 287 | void *private_data;
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| 288 |
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| 289 | char inquiry_string[INQUIRY_STRING_LEN];
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| 290 | };
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| 291 |
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| 292 | struct fsg_dev {
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| 293 | struct usb_function function;
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| 294 | struct usb_gadget *gadget;
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| 295 | struct fsg_common *common;
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| 296 |
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| 297 | u16 interface_number;
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| 298 |
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| 299 | unsigned int bulk_in_enabled:1;
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| 300 | unsigned int bulk_out_enabled:1;
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| 301 |
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| 302 | unsigned long atomic_bitflags;
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| 303 | #define IGNORE_BULK_OUT 0
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| 304 |
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| 305 | struct usb_ep *bulk_in;
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| 306 | struct usb_ep *bulk_out;
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| 307 | };
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| 308 |
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| 309 | static inline int __fsg_is_set(struct fsg_common *common,
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| 310 | const char *func, unsigned line)
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| 311 | {
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| 312 | if (common->fsg)
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| 313 | return 1;
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| 314 | ERROR(common, "common->fsg is NULL in %s at %u\n", func, line);
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| 315 | WARN_ON(1);
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| 316 | return 0;
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| 317 | }
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| 318 |
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| 319 | #define fsg_is_set(common) likely(__fsg_is_set(common, __func__, __LINE__))
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| 320 |
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| 321 | static inline struct fsg_dev *fsg_from_func(struct usb_function *f)
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| 322 | {
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| 323 | return container_of(f, struct fsg_dev, function);
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| 324 | }
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| 325 |
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| 326 | static int exception_in_progress(struct fsg_common *common)
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| 327 | {
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| 328 | return common->state > FSG_STATE_NORMAL;
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| 329 | }
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| 330 |
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| 331 |
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| 332 | static void set_bulk_out_req_length(struct fsg_common *common,
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| 333 | struct fsg_buffhd *bh, unsigned int length)
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| 334 | {
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| 335 | unsigned int rem;
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| 336 |
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| 337 | bh->bulk_out_intended_length = length;
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| 338 | rem = length % common->bulk_out_maxpacket;
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| 339 | if (rem > 0)
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| 340 | length += common->bulk_out_maxpacket - rem;
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| 341 | bh->outreq->length = length;
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| 342 | }
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| 343 |
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| 344 |
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| 345 |
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| 346 |
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| 347 | static int fsg_set_halt(struct fsg_dev *fsg, struct usb_ep *ep)
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| 348 | {
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| 349 | const char *name;
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| 350 |
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| 351 | if (ep == fsg->bulk_in)
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| 352 | name = "bulk-in";
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| 353 | else if (ep == fsg->bulk_out)
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| 354 | name = "bulk-out";
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| 355 | else
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| 356 | name = ep->name;
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| 357 | DBG(fsg, "%s set halt\n", name);
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| 358 | return usb_ep_set_halt(ep);
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| 359 | }
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| 360 |
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| 361 |
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| 362 |
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| 363 |
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| 364 |
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| 365 |
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| 366 | static void __raise_exception(struct fsg_common *common, enum fsg_state new_state,
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| 367 | void *arg)
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| 368 | {
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| 369 | unsigned long flags;
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| 370 |
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| 371 | |
| 372 | * Do nothing if a higher-priority exception is already in progress.
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| 373 | * If a lower-or-equal priority exception is in progress, preempt it
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| 374 | * and notify the main thread by sending it a signal.
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| 375 |
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| 376 | spin_lock_irqsave(&common->lock, flags);
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| 377 | if (common->state <= new_state) {
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| 378 | common->exception_req_tag = common->ep0_req_tag;
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| 379 | common->state = new_state;
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| 380 | common->exception_arg = arg;
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| 381 | if (common->thread_task)
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| 382 | send_sig_info(SIGUSR1, SEND_SIG_PRIV,
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| 383 | common->thread_task);
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| 384 | }
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| 385 | spin_unlock_irqrestore(&common->lock, flags);
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| 386 | }
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| 387 |
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| 388 | static void raise_exception(struct fsg_common *common, enum fsg_state new_state)
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| 389 | {
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| 390 | __raise_exception(common, new_state, NULL);
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| 391 | }
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| 392 |
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| 393 |
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| 394 |
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| 395 | static int ep0_queue(struct fsg_common *common)
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| 396 | {
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| 397 | int rc;
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| 398 |
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| 399 | rc = usb_ep_queue(common->ep0, common->ep0req, GFP_ATOMIC);
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| 400 | common->ep0->driver_data = common;
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| 401 | if (rc != 0 && rc != -ESHUTDOWN) {
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| 402 |
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| 403 | WARNING(common, "error in submission: %s --> %d\n",
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| 404 | common->ep0->name, rc);
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| 405 | }
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| 406 | return rc;
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| 407 | }
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| 408 |
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| 409 |
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| 410 |
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| 411 |
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| 412 |
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| 413 |
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| 414 | static void bulk_in_complete(struct usb_ep *ep, struct usb_request *req)
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| 415 | {
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| 416 | struct fsg_common *common = ep->driver_data;
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| 417 | struct fsg_buffhd *bh = req->context;
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| 418 |
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| 419 | if (req->status || req->actual != req->length)
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| 420 | DBG(common, "%s --> %d, %u/%u\n", __func__,
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| 421 | req->status, req->actual, req->length);
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| 422 | if (req->status == -ECONNRESET)
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| 423 | usb_ep_fifo_flush(ep);
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| 424 |
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| 425 |
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| 426 | smp_store_release(&bh->state, BUF_STATE_EMPTY);
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| 427 | wake_up(&common->io_wait);
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| 428 | }
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| 429 |
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| 430 | static void bulk_out_complete(struct usb_ep *ep, struct usb_request *req)
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| 431 | {
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| 432 | struct fsg_common *common = ep->driver_data;
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| 433 | struct fsg_buffhd *bh = req->context;
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| 434 |
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| 435 | dump_msg(common, "bulk-out", req->buf, req->actual);
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| 436 | if (req->status || req->actual != bh->bulk_out_intended_length)
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| 437 | DBG(common, "%s --> %d, %u/%u\n", __func__,
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| 438 | req->status, req->actual, bh->bulk_out_intended_length);
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| 439 | if (req->status == -ECONNRESET)
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| 440 | usb_ep_fifo_flush(ep);
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| 441 |
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| 442 |
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| 443 | smp_store_release(&bh->state, BUF_STATE_FULL);
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| 444 | wake_up(&common->io_wait);
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| 445 | }
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| 446 |
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| 447 | static int _fsg_common_get_max_lun(struct fsg_common *common)
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| 448 | {
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| 449 | int i = ARRAY_SIZE(common->luns) - 1;
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| 450 |
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| 451 | while (i >= 0 && !common->luns[i])
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| 452 | --i;
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| 453 |
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| 454 | return i;
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| 455 | }
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| 456 |
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| 457 | static int fsg_setup(struct usb_function *f,
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| 458 | const struct usb_ctrlrequest *ctrl)
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| 459 | {
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| 460 | struct fsg_dev *fsg = fsg_from_func(f);
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| 461 | struct usb_request *req = fsg->common->ep0req;
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| 462 | u16 w_index = le16_to_cpu(ctrl->wIndex);
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| 463 | u16 w_value = le16_to_cpu(ctrl->wValue);
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| 464 | u16 w_length = le16_to_cpu(ctrl->wLength);
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| 465 |
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| 466 | if (!fsg_is_set(fsg->common))
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| 467 | return -EOPNOTSUPP;
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| 468 |
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| 469 | ++fsg->common->ep0_req_tag;
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| 470 | req->context = NULL;
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| 471 | req->length = 0;
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| 472 | dump_msg(fsg, "ep0-setup", (u8 *) ctrl, sizeof(*ctrl));
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| 473 |
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| 474 | switch (ctrl->bRequest) {
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| 475 |
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| 476 | case US_BULK_RESET_REQUEST:
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| 477 | if (ctrl->bRequestType !=
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| 478 | (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE))
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| 479 | break;
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| 480 | if (w_index != fsg->interface_number || w_value != 0 ||
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| 481 | w_length != 0)
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| 482 | return -EDOM;
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| 483 |
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| 484 | |
| 485 | * Raise an exception to stop the current operation
|
| 486 | * and reinitialize our state.
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| 487 |
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| 488 | DBG(fsg, "bulk reset request\n");
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| 489 | raise_exception(fsg->common, FSG_STATE_PROTOCOL_RESET);
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| 490 | return USB_GADGET_DELAYED_STATUS;
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| 491 |
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| 492 | case US_BULK_GET_MAX_LUN:
|
| 493 | if (ctrl->bRequestType !=
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| 494 | (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE))
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| 495 | break;
|
| 496 | if (w_index != fsg->interface_number || w_value != 0 ||
|
| 497 | w_length != 1)
|
| 498 | return -EDOM;
|
| 499 | VDBG(fsg, "get max LUN\n");
|
| 500 | *(u8 *)req->buf = _fsg_common_get_max_lun(fsg->common);
|
| 501 |
|
| 502 |
|
| 503 | req->length = min_t(u16, 1, w_length);
|
| 504 | return ep0_queue(fsg->common);
|
| 505 | }
|
| 506 |
|
| 507 | VDBG(fsg,
|
| 508 | "unknown class-specific control req %02x.%02x v%04x i%04x l%u\n",
|
| 509 | ctrl->bRequestType, ctrl->bRequest,
|
| 510 | le16_to_cpu(ctrl->wValue), w_index, w_length);
|
| 511 | return -EOPNOTSUPP;
|
| 512 | }
|
| 513 |
|
| 514 |
|
| 515 |
|
| 516 |
|
| 517 |
|
| 518 |
|
| 519 |
|
| 520 | static int start_transfer(struct fsg_dev *fsg, struct usb_ep *ep,
|
| 521 | struct usb_request *req)
|
| 522 | {
|
| 523 | int rc;
|
| 524 |
|
| 525 | if (ep == fsg->bulk_in)
|
| 526 | dump_msg(fsg, "bulk-in", req->buf, req->length);
|
| 527 |
|
| 528 | rc = usb_ep_queue(ep, req, GFP_KERNEL);
|
| 529 | if (rc) {
|
| 530 |
|
| 531 |
|
| 532 | req->status = rc;
|
| 533 |
|
| 534 | |
| 535 | * Note: currently the net2280 driver fails zero-length
|
| 536 | * submissions if DMA is enabled.
|
| 537 |
|
| 538 | if (rc != -ESHUTDOWN &&
|
| 539 | !(rc == -EOPNOTSUPP && req->length == 0))
|
| 540 | WARNING(fsg, "error in submission: %s --> %d\n",
|
| 541 | ep->name, rc);
|
| 542 | }
|
| 543 | return rc;
|
| 544 | }
|
| 545 |
|
| 546 | static bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 547 | {
|
| 548 | int rc;
|
| 549 |
|
| 550 | if (!fsg_is_set(common))
|
| 551 | return false;
|
| 552 | bh->state = BUF_STATE_SENDING;
|
| 553 | rc = start_transfer(common->fsg, common->fsg->bulk_in, bh->inreq);
|
| 554 | if (rc) {
|
| 555 | bh->state = BUF_STATE_EMPTY;
|
| 556 | if (rc == -ESHUTDOWN) {
|
| 557 | common->running = 0;
|
| 558 | return false;
|
| 559 | }
|
| 560 | }
|
| 561 | return true;
|
| 562 | }
|
| 563 |
|
| 564 | static bool start_out_transfer(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 565 | {
|
| 566 | int rc;
|
| 567 |
|
| 568 | if (!fsg_is_set(common))
|
| 569 | return false;
|
| 570 | bh->state = BUF_STATE_RECEIVING;
|
| 571 | rc = start_transfer(common->fsg, common->fsg->bulk_out, bh->outreq);
|
| 572 | if (rc) {
|
| 573 | bh->state = BUF_STATE_FULL;
|
| 574 | if (rc == -ESHUTDOWN) {
|
| 575 | common->running = 0;
|
| 576 | return false;
|
| 577 | }
|
| 578 | }
|
| 579 | return true;
|
| 580 | }
|
| 581 |
|
| 582 | static int sleep_thread(struct fsg_common *common, bool can_freeze,
|
| 583 | struct fsg_buffhd *bh)
|
| 584 | {
|
| 585 | int rc;
|
| 586 |
|
| 587 |
|
| 588 | if (can_freeze)
|
| 589 | |
| 590 | * synchronize with the smp_store_release(&bh->state) in
|
| 591 | * bulk_in_complete() or bulk_out_complete()
|
| 592 |
|
| 593 | rc = wait_event_freezable(common->io_wait,
|
| 594 | bh && smp_load_acquire(&bh->state) >=
|
| 595 | BUF_STATE_EMPTY);
|
| 596 | else
|
| 597 | rc = wait_event_interruptible(common->io_wait,
|
| 598 | bh && smp_load_acquire(&bh->state) >=
|
| 599 | BUF_STATE_EMPTY);
|
| 600 | return rc ? -EINTR : 0;
|
| 601 | }
|
| 602 |
|
| 603 |
|
| 604 |
|
| 605 |
|
| 606 | static int do_read(struct fsg_common *common)
|
| 607 | {
|
| 608 | struct fsg_lun *curlun = common->curlun;
|
| 609 | u64 lba;
|
| 610 | struct fsg_buffhd *bh;
|
| 611 | int rc;
|
| 612 | u32 amount_left;
|
| 613 | loff_t file_offset, file_offset_tmp;
|
| 614 | unsigned int amount;
|
| 615 | ssize_t nread;
|
| 616 |
|
| 617 | |
| 618 | * Get the starting Logical Block Address and check that it's
|
| 619 | * not too big.
|
| 620 |
|
| 621 | if (common->cmnd[0] == READ_6)
|
| 622 | lba = get_unaligned_be24(&common->cmnd[1]);
|
| 623 | else {
|
| 624 | if (common->cmnd[0] == READ_16)
|
| 625 | lba = get_unaligned_be64(&common->cmnd[2]);
|
| 626 | else
|
| 627 | lba = get_unaligned_be32(&common->cmnd[2]);
|
| 628 |
|
| 629 | |
| 630 | * We allow DPO (Disable Page Out = don't save data in the
|
| 631 | * cache) and FUA (Force Unit Access = don't read from the
|
| 632 | * cache), but we don't implement them.
|
| 633 |
|
| 634 | if ((common->cmnd[1] & ~0x18) != 0) {
|
| 635 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 636 | return -EINVAL;
|
| 637 | }
|
| 638 | }
|
| 639 | if (lba >= curlun->num_sectors) {
|
| 640 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
|
| 641 | return -EINVAL;
|
| 642 | }
|
| 643 | file_offset = ((loff_t) lba) << curlun->blkbits;
|
| 644 |
|
| 645 |
|
| 646 | amount_left = common->data_size_from_cmnd;
|
| 647 | if (unlikely(amount_left == 0))
|
| 648 | return -EIO;
|
| 649 |
|
| 650 | for (;;) {
|
| 651 | |
| 652 | * Figure out how much we need to read:
|
| 653 | * Try to read the remaining amount.
|
| 654 | * But don't read more than the buffer size.
|
| 655 | * And don't try to read past the end of the file.
|
| 656 |
|
| 657 | amount = min(amount_left, FSG_BUFLEN);
|
| 658 | amount = min_t(loff_t, amount,
|
| 659 | curlun->file_length - file_offset);
|
| 660 |
|
| 661 |
|
| 662 | bh = common->next_buffhd_to_fill;
|
| 663 | rc = sleep_thread(common, false, bh);
|
| 664 | if (rc)
|
| 665 | return rc;
|
| 666 |
|
| 667 | |
| 668 | * If we were asked to read past the end of file,
|
| 669 | * end with an empty buffer.
|
| 670 |
|
| 671 | if (amount == 0) {
|
| 672 | curlun->sense_data =
|
| 673 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
|
| 674 | curlun->sense_data_info =
|
| 675 | file_offset >> curlun->blkbits;
|
| 676 | curlun->info_valid = 1;
|
| 677 | bh->inreq->length = 0;
|
| 678 | bh->state = BUF_STATE_FULL;
|
| 679 | break;
|
| 680 | }
|
| 681 |
|
| 682 |
|
| 683 | file_offset_tmp = file_offset;
|
| 684 | nread = kernel_read(curlun->filp, bh->buf, amount,
|
| 685 | &file_offset_tmp);
|
| 686 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
|
| 687 | (unsigned long long)file_offset, (int)nread);
|
| 688 | if (signal_pending(current))
|
| 689 | return -EINTR;
|
| 690 |
|
| 691 | if (nread < 0) {
|
| 692 | LDBG(curlun, "error in file read: %d\n", (int)nread);
|
| 693 | nread = 0;
|
| 694 | } else if (nread < amount) {
|
| 695 | LDBG(curlun, "partial file read: %d/%u\n",
|
| 696 | (int)nread, amount);
|
| 697 | nread = round_down(nread, curlun->blksize);
|
| 698 | }
|
| 699 | file_offset += nread;
|
| 700 | amount_left -= nread;
|
| 701 | common->residue -= nread;
|
| 702 |
|
| 703 | |
| 704 | * Except at the end of the transfer, nread will be
|
| 705 | * equal to the buffer size, which is divisible by the
|
| 706 | * bulk-in maxpacket size.
|
| 707 |
|
| 708 | bh->inreq->length = nread;
|
| 709 | bh->state = BUF_STATE_FULL;
|
| 710 |
|
| 711 |
|
| 712 | if (nread < amount) {
|
| 713 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
|
| 714 | curlun->sense_data_info =
|
| 715 | file_offset >> curlun->blkbits;
|
| 716 | curlun->info_valid = 1;
|
| 717 | break;
|
| 718 | }
|
| 719 |
|
| 720 | if (amount_left == 0)
|
| 721 | break;
|
| 722 |
|
| 723 |
|
| 724 | bh->inreq->zero = 0;
|
| 725 | if (!start_in_transfer(common, bh))
|
| 726 |
|
| 727 | return -EIO;
|
| 728 | common->next_buffhd_to_fill = bh->next;
|
| 729 | }
|
| 730 |
|
| 731 | return -EIO;
|
| 732 | }
|
| 733 |
|
| 734 |
|
| 735 |
|
| 736 |
|
| 737 | static int do_write(struct fsg_common *common)
|
| 738 | {
|
| 739 | struct fsg_lun *curlun = common->curlun;
|
| 740 | u64 lba;
|
| 741 | struct fsg_buffhd *bh;
|
| 742 | int get_some_more;
|
| 743 | u32 amount_left_to_req, amount_left_to_write;
|
| 744 | loff_t usb_offset, file_offset, file_offset_tmp;
|
| 745 | unsigned int amount;
|
| 746 | ssize_t nwritten;
|
| 747 | int rc;
|
| 748 |
|
| 749 | if (curlun->ro) {
|
| 750 | curlun->sense_data = SS_WRITE_PROTECTED;
|
| 751 | return -EINVAL;
|
| 752 | }
|
| 753 | spin_lock(&curlun->filp->f_lock);
|
| 754 | curlun->filp->f_flags &= ~O_SYNC;
|
| 755 | spin_unlock(&curlun->filp->f_lock);
|
| 756 |
|
| 757 | |
| 758 | * Get the starting Logical Block Address and check that it's
|
| 759 | * not too big
|
| 760 |
|
| 761 | if (common->cmnd[0] == WRITE_6)
|
| 762 | lba = get_unaligned_be24(&common->cmnd[1]);
|
| 763 | else {
|
| 764 | if (common->cmnd[0] == WRITE_16)
|
| 765 | lba = get_unaligned_be64(&common->cmnd[2]);
|
| 766 | else
|
| 767 | lba = get_unaligned_be32(&common->cmnd[2]);
|
| 768 |
|
| 769 | |
| 770 | * We allow DPO (Disable Page Out = don't save data in the
|
| 771 | * cache) and FUA (Force Unit Access = write directly to the
|
| 772 | * medium). We don't implement DPO; we implement FUA by
|
| 773 | * performing synchronous output.
|
| 774 |
|
| 775 | if (common->cmnd[1] & ~0x18) {
|
| 776 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 777 | return -EINVAL;
|
| 778 | }
|
| 779 | if (!curlun->nofua && (common->cmnd[1] & 0x08)) {
|
| 780 | spin_lock(&curlun->filp->f_lock);
|
| 781 | curlun->filp->f_flags |= O_SYNC;
|
| 782 | spin_unlock(&curlun->filp->f_lock);
|
| 783 | }
|
| 784 | }
|
| 785 | if (lba >= curlun->num_sectors) {
|
| 786 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
|
| 787 | return -EINVAL;
|
| 788 | }
|
| 789 |
|
| 790 |
|
| 791 | get_some_more = 1;
|
| 792 | file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits;
|
| 793 | amount_left_to_req = common->data_size_from_cmnd;
|
| 794 | amount_left_to_write = common->data_size_from_cmnd;
|
| 795 |
|
| 796 | while (amount_left_to_write > 0) {
|
| 797 |
|
| 798 |
|
| 799 | bh = common->next_buffhd_to_fill;
|
| 800 | if (bh->state == BUF_STATE_EMPTY && get_some_more) {
|
| 801 |
|
| 802 | |
| 803 | * Figure out how much we want to get:
|
| 804 | * Try to get the remaining amount,
|
| 805 | * but not more than the buffer size.
|
| 806 |
|
| 807 | amount = min(amount_left_to_req, FSG_BUFLEN);
|
| 808 |
|
| 809 |
|
| 810 | if (usb_offset >= curlun->file_length) {
|
| 811 | get_some_more = 0;
|
| 812 | curlun->sense_data =
|
| 813 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
|
| 814 | curlun->sense_data_info =
|
| 815 | usb_offset >> curlun->blkbits;
|
| 816 | curlun->info_valid = 1;
|
| 817 | continue;
|
| 818 | }
|
| 819 |
|
| 820 |
|
| 821 | usb_offset += amount;
|
| 822 | common->usb_amount_left -= amount;
|
| 823 | amount_left_to_req -= amount;
|
| 824 | if (amount_left_to_req == 0)
|
| 825 | get_some_more = 0;
|
| 826 |
|
| 827 | |
| 828 | * Except at the end of the transfer, amount will be
|
| 829 | * equal to the buffer size, which is divisible by
|
| 830 | * the bulk-out maxpacket size.
|
| 831 |
|
| 832 | set_bulk_out_req_length(common, bh, amount);
|
| 833 | if (!start_out_transfer(common, bh))
|
| 834 |
|
| 835 | return -EIO;
|
| 836 | common->next_buffhd_to_fill = bh->next;
|
| 837 | continue;
|
| 838 | }
|
| 839 |
|
| 840 |
|
| 841 | bh = common->next_buffhd_to_drain;
|
| 842 | if (bh->state == BUF_STATE_EMPTY && !get_some_more)
|
| 843 | break;
|
| 844 |
|
| 845 |
|
| 846 | rc = sleep_thread(common, false, bh);
|
| 847 | if (rc)
|
| 848 | return rc;
|
| 849 |
|
| 850 | common->next_buffhd_to_drain = bh->next;
|
| 851 | bh->state = BUF_STATE_EMPTY;
|
| 852 |
|
| 853 |
|
| 854 | if (bh->outreq->status != 0) {
|
| 855 | curlun->sense_data = SS_COMMUNICATION_FAILURE;
|
| 856 | curlun->sense_data_info =
|
| 857 | file_offset >> curlun->blkbits;
|
| 858 | curlun->info_valid = 1;
|
| 859 | break;
|
| 860 | }
|
| 861 |
|
| 862 | amount = bh->outreq->actual;
|
| 863 | if (curlun->file_length - file_offset < amount) {
|
| 864 | LERROR(curlun, "write %u @ %llu beyond end %llu\n",
|
| 865 | amount, (unsigned long long)file_offset,
|
| 866 | (unsigned long long)curlun->file_length);
|
| 867 | amount = curlun->file_length - file_offset;
|
| 868 | }
|
| 869 |
|
| 870 | |
| 871 | * Don't accept excess data. The spec doesn't say
|
| 872 | * what to do in this case. We'll ignore the error.
|
| 873 |
|
| 874 | amount = min(amount, bh->bulk_out_intended_length);
|
| 875 |
|
| 876 |
|
| 877 | amount = round_down(amount, curlun->blksize);
|
| 878 | if (amount == 0)
|
| 879 | goto empty_write;
|
| 880 |
|
| 881 |
|
| 882 | file_offset_tmp = file_offset;
|
| 883 | nwritten = kernel_write(curlun->filp, bh->buf, amount,
|
| 884 | &file_offset_tmp);
|
| 885 | VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
|
| 886 | (unsigned long long)file_offset, (int)nwritten);
|
| 887 | if (signal_pending(current))
|
| 888 | return -EINTR;
|
| 889 |
|
| 890 | if (nwritten < 0) {
|
| 891 | LDBG(curlun, "error in file write: %d\n",
|
| 892 | (int) nwritten);
|
| 893 | nwritten = 0;
|
| 894 | } else if (nwritten < amount) {
|
| 895 | LDBG(curlun, "partial file write: %d/%u\n",
|
| 896 | (int) nwritten, amount);
|
| 897 | nwritten = round_down(nwritten, curlun->blksize);
|
| 898 | }
|
| 899 | file_offset += nwritten;
|
| 900 | amount_left_to_write -= nwritten;
|
| 901 | common->residue -= nwritten;
|
| 902 |
|
| 903 |
|
| 904 | if (nwritten < amount) {
|
| 905 | curlun->sense_data = SS_WRITE_ERROR;
|
| 906 | curlun->sense_data_info =
|
| 907 | file_offset >> curlun->blkbits;
|
| 908 | curlun->info_valid = 1;
|
| 909 | break;
|
| 910 | }
|
| 911 |
|
| 912 | empty_write:
|
| 913 |
|
| 914 | if (bh->outreq->actual < bh->bulk_out_intended_length) {
|
| 915 | common->short_packet_received = 1;
|
| 916 | break;
|
| 917 | }
|
| 918 | }
|
| 919 |
|
| 920 | return -EIO;
|
| 921 | }
|
| 922 |
|
| 923 |
|
| 924 |
|
| 925 |
|
| 926 | static int do_synchronize_cache(struct fsg_common *common)
|
| 927 | {
|
| 928 | struct fsg_lun *curlun = common->curlun;
|
| 929 | int rc;
|
| 930 |
|
| 931 | |
| 932 | * dirty data buffers.
|
| 933 | rc = fsg_lun_fsync_sub(curlun);
|
| 934 | if (rc)
|
| 935 | curlun->sense_data = SS_WRITE_ERROR;
|
| 936 | return 0;
|
| 937 | }
|
| 938 |
|
| 939 |
|
| 940 |
|
| 941 |
|
| 942 | static void invalidate_sub(struct fsg_lun *curlun)
|
| 943 | {
|
| 944 | struct file *filp = curlun->filp;
|
| 945 | struct inode *inode = file_inode(filp);
|
| 946 | unsigned long __maybe_unused rc;
|
| 947 |
|
| 948 | rc = invalidate_mapping_pages(inode->i_mapping, 0, -1);
|
| 949 | VLDBG(curlun, "invalidate_mapping_pages -> %ld\n", rc);
|
| 950 | }
|
| 951 |
|
| 952 | static int do_verify(struct fsg_common *common)
|
| 953 | {
|
| 954 | struct fsg_lun *curlun = common->curlun;
|
| 955 | u32 lba;
|
| 956 | u32 verification_length;
|
| 957 | struct fsg_buffhd *bh = common->next_buffhd_to_fill;
|
| 958 | loff_t file_offset, file_offset_tmp;
|
| 959 | u32 amount_left;
|
| 960 | unsigned int amount;
|
| 961 | ssize_t nread;
|
| 962 |
|
| 963 | |
| 964 | * Get the starting Logical Block Address and check that it's
|
| 965 | * not too big.
|
| 966 |
|
| 967 | lba = get_unaligned_be32(&common->cmnd[2]);
|
| 968 | if (lba >= curlun->num_sectors) {
|
| 969 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
|
| 970 | return -EINVAL;
|
| 971 | }
|
| 972 |
|
| 973 | |
| 974 | * We allow DPO (Disable Page Out = don't save data in the
|
| 975 | * cache) but we don't implement it.
|
| 976 |
|
| 977 | if (common->cmnd[1] & ~0x10) {
|
| 978 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 979 | return -EINVAL;
|
| 980 | }
|
| 981 |
|
| 982 | verification_length = get_unaligned_be16(&common->cmnd[7]);
|
| 983 | if (unlikely(verification_length == 0))
|
| 984 | return -EIO;
|
| 985 |
|
| 986 |
|
| 987 | amount_left = verification_length << curlun->blkbits;
|
| 988 | file_offset = ((loff_t) lba) << curlun->blkbits;
|
| 989 |
|
| 990 |
|
| 991 | fsg_lun_fsync_sub(curlun);
|
| 992 | if (signal_pending(current))
|
| 993 | return -EINTR;
|
| 994 |
|
| 995 | invalidate_sub(curlun);
|
| 996 | if (signal_pending(current))
|
| 997 | return -EINTR;
|
| 998 |
|
| 999 |
|
| 1000 | while (amount_left > 0) {
|
| 1001 | |
| 1002 | * Figure out how much we need to read:
|
| 1003 | * Try to read the remaining amount, but not more than
|
| 1004 | * the buffer size.
|
| 1005 | * And don't try to read past the end of the file.
|
| 1006 |
|
| 1007 | amount = min(amount_left, FSG_BUFLEN);
|
| 1008 | amount = min_t(loff_t, amount,
|
| 1009 | curlun->file_length - file_offset);
|
| 1010 | if (amount == 0) {
|
| 1011 | curlun->sense_data =
|
| 1012 | SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
|
| 1013 | curlun->sense_data_info =
|
| 1014 | file_offset >> curlun->blkbits;
|
| 1015 | curlun->info_valid = 1;
|
| 1016 | break;
|
| 1017 | }
|
| 1018 |
|
| 1019 |
|
| 1020 | file_offset_tmp = file_offset;
|
| 1021 | nread = kernel_read(curlun->filp, bh->buf, amount,
|
| 1022 | &file_offset_tmp);
|
| 1023 | VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
|
| 1024 | (unsigned long long) file_offset,
|
| 1025 | (int) nread);
|
| 1026 | if (signal_pending(current))
|
| 1027 | return -EINTR;
|
| 1028 |
|
| 1029 | if (nread < 0) {
|
| 1030 | LDBG(curlun, "error in file verify: %d\n", (int)nread);
|
| 1031 | nread = 0;
|
| 1032 | } else if (nread < amount) {
|
| 1033 | LDBG(curlun, "partial file verify: %d/%u\n",
|
| 1034 | (int)nread, amount);
|
| 1035 | nread = round_down(nread, curlun->blksize);
|
| 1036 | }
|
| 1037 | if (nread == 0) {
|
| 1038 | curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
|
| 1039 | curlun->sense_data_info =
|
| 1040 | file_offset >> curlun->blkbits;
|
| 1041 | curlun->info_valid = 1;
|
| 1042 | break;
|
| 1043 | }
|
| 1044 | file_offset += nread;
|
| 1045 | amount_left -= nread;
|
| 1046 | }
|
| 1047 | return 0;
|
| 1048 | }
|
| 1049 |
|
| 1050 |
|
| 1051 |
|
| 1052 |
|
| 1053 | static int do_inquiry(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1054 | {
|
| 1055 | struct fsg_lun *curlun = common->curlun;
|
| 1056 | u8 *buf = (u8 *) bh->buf;
|
| 1057 |
|
| 1058 | if (!curlun) {
|
| 1059 | common->bad_lun_okay = 1;
|
| 1060 | memset(buf, 0, 36);
|
| 1061 | buf[0] = TYPE_NO_LUN;
|
| 1062 | buf[4] = 31;
|
| 1063 | return 36;
|
| 1064 | }
|
| 1065 |
|
| 1066 | buf[0] = curlun->cdrom ? TYPE_ROM : TYPE_DISK;
|
| 1067 | buf[1] = curlun->removable ? 0x80 : 0;
|
| 1068 | buf[2] = 2;
|
| 1069 | buf[3] = 2;
|
| 1070 | buf[4] = 31;
|
| 1071 | buf[5] = 0;
|
| 1072 | buf[6] = 0;
|
| 1073 | buf[7] = 0;
|
| 1074 | if (curlun->inquiry_string[0])
|
| 1075 | memcpy(buf + 8, curlun->inquiry_string,
|
| 1076 | sizeof(curlun->inquiry_string));
|
| 1077 | else
|
| 1078 | memcpy(buf + 8, common->inquiry_string,
|
| 1079 | sizeof(common->inquiry_string));
|
| 1080 | return 36;
|
| 1081 | }
|
| 1082 |
|
| 1083 | static int do_request_sense(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1084 | {
|
| 1085 | struct fsg_lun *curlun = common->curlun;
|
| 1086 | u8 *buf = (u8 *) bh->buf;
|
| 1087 | u32 sd, sdinfo;
|
| 1088 | int valid;
|
| 1089 |
|
| 1090 | |
| 1091 | * From the SCSI-2 spec., section 7.9 (Unit attention condition):
|
| 1092 | *
|
| 1093 | * If a REQUEST SENSE command is received from an initiator
|
| 1094 | * with a pending unit attention condition (before the target
|
| 1095 | * generates the contingent allegiance condition), then the
|
| 1096 | * target shall either:
|
| 1097 | * a) report any pending sense data and preserve the unit
|
| 1098 | * attention condition on the logical unit, or,
|
| 1099 | * b) report the unit attention condition, may discard any
|
| 1100 | * pending sense data, and clear the unit attention
|
| 1101 | * condition on the logical unit for that initiator.
|
| 1102 | *
|
| 1103 | * FSG normally uses option a); enable this code to use option b).
|
| 1104 |
|
| 1105 | #if 0 |
| 1106 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE) {
|
| 1107 | curlun->sense_data = curlun->unit_attention_data;
|
| 1108 | curlun->unit_attention_data = SS_NO_SENSE;
|
| 1109 | }
|
| 1110 | #endif
|
| 1111 |
|
| 1112 | if (!curlun) {
|
| 1113 | common->bad_lun_okay = 1;
|
| 1114 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
|
| 1115 | sdinfo = 0;
|
| 1116 | valid = 0;
|
| 1117 | } else {
|
| 1118 | sd = curlun->sense_data;
|
| 1119 | sdinfo = curlun->sense_data_info;
|
| 1120 | valid = curlun->info_valid << 7;
|
| 1121 | curlun->sense_data = SS_NO_SENSE;
|
| 1122 | curlun->sense_data_info = 0;
|
| 1123 | curlun->info_valid = 0;
|
| 1124 | }
|
| 1125 |
|
| 1126 | memset(buf, 0, 18);
|
| 1127 | buf[0] = valid | 0x70;
|
| 1128 | buf[2] = SK(sd);
|
| 1129 | put_unaligned_be32(sdinfo, &buf[3]);
|
| 1130 | buf[7] = 18 - 8;
|
| 1131 | buf[12] = ASC(sd);
|
| 1132 | buf[13] = ASCQ(sd);
|
| 1133 | return 18;
|
| 1134 | }
|
| 1135 |
|
| 1136 | static int do_read_capacity(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1137 | {
|
| 1138 | struct fsg_lun *curlun = common->curlun;
|
| 1139 | u32 lba = get_unaligned_be32(&common->cmnd[2]);
|
| 1140 | int pmi = common->cmnd[8];
|
| 1141 | u8 *buf = (u8 *)bh->buf;
|
| 1142 | u32 max_lba;
|
| 1143 |
|
| 1144 |
|
| 1145 | if (pmi > 1 || (pmi == 0 && lba != 0)) {
|
| 1146 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1147 | return -EINVAL;
|
| 1148 | }
|
| 1149 |
|
| 1150 | if (curlun->num_sectors < 0x100000000ULL)
|
| 1151 | max_lba = curlun->num_sectors - 1;
|
| 1152 | else
|
| 1153 | max_lba = 0xffffffff;
|
| 1154 | put_unaligned_be32(max_lba, &buf[0]);
|
| 1155 | put_unaligned_be32(curlun->blksize, &buf[4]);
|
| 1156 | return 8;
|
| 1157 | }
|
| 1158 |
|
| 1159 | static int do_read_capacity_16(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1160 | {
|
| 1161 | struct fsg_lun *curlun = common->curlun;
|
| 1162 | u64 lba = get_unaligned_be64(&common->cmnd[2]);
|
| 1163 | int pmi = common->cmnd[14];
|
| 1164 | u8 *buf = (u8 *)bh->buf;
|
| 1165 |
|
| 1166 |
|
| 1167 | if (pmi > 1 || (pmi == 0 && lba != 0)) {
|
| 1168 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1169 | return -EINVAL;
|
| 1170 | }
|
| 1171 |
|
| 1172 | put_unaligned_be64(curlun->num_sectors - 1, &buf[0]);
|
| 1173 |
|
| 1174 | put_unaligned_be32(curlun->blksize, &buf[8]);
|
| 1175 |
|
| 1176 |
|
| 1177 | memset(&buf[12], 0, 32 - 12);
|
| 1178 | return 32;
|
| 1179 | }
|
| 1180 |
|
| 1181 | static int do_read_header(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1182 | {
|
| 1183 | struct fsg_lun *curlun = common->curlun;
|
| 1184 | int msf = common->cmnd[1] & 0x02;
|
| 1185 | u32 lba = get_unaligned_be32(&common->cmnd[2]);
|
| 1186 | u8 *buf = (u8 *)bh->buf;
|
| 1187 |
|
| 1188 | if (common->cmnd[1] & ~0x02) {
|
| 1189 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1190 | return -EINVAL;
|
| 1191 | }
|
| 1192 | if (lba >= curlun->num_sectors) {
|
| 1193 | curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
|
| 1194 | return -EINVAL;
|
| 1195 | }
|
| 1196 |
|
| 1197 | memset(buf, 0, 8);
|
| 1198 | buf[0] = 0x01;
|
| 1199 | store_cdrom_address(&buf[4], msf, lba);
|
| 1200 | return 8;
|
| 1201 | }
|
| 1202 |
|
| 1203 | static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1204 | {
|
| 1205 | struct fsg_lun *curlun = common->curlun;
|
| 1206 | int msf = common->cmnd[1] & 0x02;
|
| 1207 | int start_track = common->cmnd[6];
|
| 1208 | u8 *buf = (u8 *)bh->buf;
|
| 1209 | u8 format;
|
| 1210 | int i, len;
|
| 1211 |
|
| 1212 | format = common->cmnd[2] & 0xf;
|
| 1213 |
|
| 1214 | if ((common->cmnd[1] & ~0x02) != 0 ||
|
| 1215 | (start_track > 1 && format != 0x1)) {
|
| 1216 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1217 | return -EINVAL;
|
| 1218 | }
|
| 1219 |
|
| 1220 | |
| 1221 | * Check if CDB is old style SFF-8020i
|
| 1222 | * i.e. format is in 2 MSBs of byte 9
|
| 1223 | * Mac OS-X host sends us this.
|
| 1224 |
|
| 1225 | if (format == 0)
|
| 1226 | format = (common->cmnd[9] >> 6) & 0x3;
|
| 1227 |
|
| 1228 | switch (format) {
|
| 1229 | case 0:
|
| 1230 | case 1:
|
| 1231 | len = 4 + 2*8;
|
| 1232 | memset(buf, 0, len);
|
| 1233 | buf[1] = len - 2;
|
| 1234 | buf[2] = 1;
|
| 1235 | buf[3] = 1;
|
| 1236 | buf[5] = 0x16;
|
| 1237 | buf[6] = 0x01;
|
| 1238 | store_cdrom_address(&buf[8], msf, 0);
|
| 1239 |
|
| 1240 | buf[13] = 0x16;
|
| 1241 | buf[14] = 0xAA;
|
| 1242 | store_cdrom_address(&buf[16], msf, curlun->num_sectors);
|
| 1243 | return len;
|
| 1244 |
|
| 1245 | case 2:
|
| 1246 |
|
| 1247 | len = 4 + 3*11;
|
| 1248 | memset(buf, 0, len);
|
| 1249 | buf[1] = len - 2;
|
| 1250 | buf[2] = 1;
|
| 1251 | buf[3] = 1;
|
| 1252 |
|
| 1253 | buf += 4;
|
| 1254 |
|
| 1255 | for (i = 0; i < 3; i++) {
|
| 1256 | buf[0] = 1;
|
| 1257 | buf[1] = 0x16;
|
| 1258 |
|
| 1259 | buf[3] = 0xA0 + i;
|
| 1260 |
|
| 1261 | buf[8] = 1;
|
| 1262 | buf += 11;
|
| 1263 | }
|
| 1264 | buf -= 11;
|
| 1265 |
|
| 1266 |
|
| 1267 | store_cdrom_address(&buf[7], msf, curlun->num_sectors);
|
| 1268 | return len;
|
| 1269 |
|
| 1270 | default:
|
| 1271 |
|
| 1272 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1273 | return -EINVAL;
|
| 1274 | }
|
| 1275 | }
|
| 1276 |
|
| 1277 | static int do_mode_sense(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1278 | {
|
| 1279 | struct fsg_lun *curlun = common->curlun;
|
| 1280 | int mscmnd = common->cmnd[0];
|
| 1281 | u8 *buf = (u8 *) bh->buf;
|
| 1282 | u8 *buf0 = buf;
|
| 1283 | int pc, page_code;
|
| 1284 | int changeable_values, all_pages;
|
| 1285 | int valid_page = 0;
|
| 1286 | int len, limit;
|
| 1287 |
|
| 1288 | if ((common->cmnd[1] & ~0x08) != 0) {
|
| 1289 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1290 | return -EINVAL;
|
| 1291 | }
|
| 1292 | pc = common->cmnd[2] >> 6;
|
| 1293 | page_code = common->cmnd[2] & 0x3f;
|
| 1294 | if (pc == 3) {
|
| 1295 | curlun->sense_data = SS_SAVING_PARAMETERS_NOT_SUPPORTED;
|
| 1296 | return -EINVAL;
|
| 1297 | }
|
| 1298 | changeable_values = (pc == 1);
|
| 1299 | all_pages = (page_code == 0x3f);
|
| 1300 |
|
| 1301 | |
| 1302 | * Write the mode parameter header. Fixed values are: default
|
| 1303 | * medium type, no cache control (DPOFUA), and no block descriptors.
|
| 1304 | * The only variable value is the WriteProtect bit. We will fill in
|
| 1305 | * the mode data length later.
|
| 1306 |
|
| 1307 | memset(buf, 0, 8);
|
| 1308 | if (mscmnd == MODE_SENSE) {
|
| 1309 | buf[2] = (curlun->ro ? 0x80 : 0x00);
|
| 1310 | buf += 4;
|
| 1311 | limit = 255;
|
| 1312 | } else {
|
| 1313 | buf[3] = (curlun->ro ? 0x80 : 0x00);
|
| 1314 | buf += 8;
|
| 1315 | limit = 65535;
|
| 1316 | }
|
| 1317 |
|
| 1318 |
|
| 1319 |
|
| 1320 | |
| 1321 | * The mode pages, in numerical order. The only page we support
|
| 1322 | * is the Caching page.
|
| 1323 |
|
| 1324 | if (page_code == 0x08 || all_pages) {
|
| 1325 | valid_page = 1;
|
| 1326 | buf[0] = 0x08;
|
| 1327 | buf[1] = 10;
|
| 1328 | memset(buf+2, 0, 10);
|
| 1329 |
|
| 1330 | if (!changeable_values) {
|
| 1331 | buf[2] = 0x04;
|
| 1332 |
|
| 1333 |
|
| 1334 | put_unaligned_be16(0xffff, &buf[4]);
|
| 1335 |
|
| 1336 |
|
| 1337 | put_unaligned_be16(0xffff, &buf[8]);
|
| 1338 |
|
| 1339 | put_unaligned_be16(0xffff, &buf[10]);
|
| 1340 |
|
| 1341 | }
|
| 1342 | buf += 12;
|
| 1343 | }
|
| 1344 |
|
| 1345 | |
| 1346 | * Check that a valid page was requested and the mode data length
|
| 1347 | * isn't too long.
|
| 1348 |
|
| 1349 | len = buf - buf0;
|
| 1350 | if (!valid_page || len > limit) {
|
| 1351 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1352 | return -EINVAL;
|
| 1353 | }
|
| 1354 |
|
| 1355 |
|
| 1356 | if (mscmnd == MODE_SENSE)
|
| 1357 | buf0[0] = len - 1;
|
| 1358 | else
|
| 1359 | put_unaligned_be16(len - 2, buf0);
|
| 1360 | return len;
|
| 1361 | }
|
| 1362 |
|
| 1363 | static int do_start_stop(struct fsg_common *common)
|
| 1364 | {
|
| 1365 | struct fsg_lun *curlun = common->curlun;
|
| 1366 | int loej, start;
|
| 1367 |
|
| 1368 | if (!curlun) {
|
| 1369 | return -EINVAL;
|
| 1370 | } else if (!curlun->removable) {
|
| 1371 | curlun->sense_data = SS_INVALID_COMMAND;
|
| 1372 | return -EINVAL;
|
| 1373 | } else if ((common->cmnd[1] & ~0x01) != 0 ||
|
| 1374 | (common->cmnd[4] & ~0x03) != 0) {
|
| 1375 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1376 | return -EINVAL;
|
| 1377 | }
|
| 1378 |
|
| 1379 | loej = common->cmnd[4] & 0x02;
|
| 1380 | start = common->cmnd[4] & 0x01;
|
| 1381 |
|
| 1382 | |
| 1383 | * Our emulation doesn't support mounting; the medium is
|
| 1384 | * available for use as soon as it is loaded.
|
| 1385 |
|
| 1386 | if (start) {
|
| 1387 | if (!fsg_lun_is_open(curlun)) {
|
| 1388 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
|
| 1389 | return -EINVAL;
|
| 1390 | }
|
| 1391 | return 0;
|
| 1392 | }
|
| 1393 |
|
| 1394 |
|
| 1395 | if (curlun->prevent_medium_removal) {
|
| 1396 | LDBG(curlun, "unload attempt prevented\n");
|
| 1397 | curlun->sense_data = SS_MEDIUM_REMOVAL_PREVENTED;
|
| 1398 | return -EINVAL;
|
| 1399 | }
|
| 1400 |
|
| 1401 | if (!loej)
|
| 1402 | return 0;
|
| 1403 |
|
| 1404 | up_read(&common->filesem);
|
| 1405 | down_write(&common->filesem);
|
| 1406 | fsg_lun_close(curlun);
|
| 1407 | up_write(&common->filesem);
|
| 1408 | down_read(&common->filesem);
|
| 1409 |
|
| 1410 | return 0;
|
| 1411 | }
|
| 1412 |
|
| 1413 | static int do_prevent_allow(struct fsg_common *common)
|
| 1414 | {
|
| 1415 | struct fsg_lun *curlun = common->curlun;
|
| 1416 | int prevent;
|
| 1417 |
|
| 1418 | if (!common->curlun) {
|
| 1419 | return -EINVAL;
|
| 1420 | } else if (!common->curlun->removable) {
|
| 1421 | common->curlun->sense_data = SS_INVALID_COMMAND;
|
| 1422 | return -EINVAL;
|
| 1423 | }
|
| 1424 |
|
| 1425 | prevent = common->cmnd[4] & 0x01;
|
| 1426 | if ((common->cmnd[4] & ~0x01) != 0) {
|
| 1427 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1428 | return -EINVAL;
|
| 1429 | }
|
| 1430 |
|
| 1431 | if (curlun->prevent_medium_removal && !prevent)
|
| 1432 | fsg_lun_fsync_sub(curlun);
|
| 1433 | curlun->prevent_medium_removal = prevent;
|
| 1434 | return 0;
|
| 1435 | }
|
| 1436 |
|
| 1437 | static int do_read_format_capacities(struct fsg_common *common,
|
| 1438 | struct fsg_buffhd *bh)
|
| 1439 | {
|
| 1440 | struct fsg_lun *curlun = common->curlun;
|
| 1441 | u8 *buf = (u8 *) bh->buf;
|
| 1442 |
|
| 1443 | buf[0] = buf[1] = buf[2] = 0;
|
| 1444 | buf[3] = 8;
|
| 1445 | buf += 4;
|
| 1446 |
|
| 1447 | put_unaligned_be32(curlun->num_sectors, &buf[0]);
|
| 1448 |
|
| 1449 | put_unaligned_be32(curlun->blksize, &buf[4]);
|
| 1450 | buf[4] = 0x02;
|
| 1451 | return 12;
|
| 1452 | }
|
| 1453 |
|
| 1454 | static int do_mode_select(struct fsg_common *common, struct fsg_buffhd *bh)
|
| 1455 | {
|
| 1456 | struct fsg_lun *curlun = common->curlun;
|
| 1457 |
|
| 1458 |
|
| 1459 | if (curlun)
|
| 1460 | curlun->sense_data = SS_INVALID_COMMAND;
|
| 1461 | return -EINVAL;
|
| 1462 | }
|
| 1463 |
|
| 1464 |
|
| 1465 |
|
| 1466 |
|
| 1467 | static int halt_bulk_in_endpoint(struct fsg_dev *fsg)
|
| 1468 | {
|
| 1469 | int rc;
|
| 1470 |
|
| 1471 | rc = fsg_set_halt(fsg, fsg->bulk_in);
|
| 1472 | if (rc == -EAGAIN)
|
| 1473 | VDBG(fsg, "delayed bulk-in endpoint halt\n");
|
| 1474 | while (rc != 0) {
|
| 1475 | if (rc != -EAGAIN) {
|
| 1476 | WARNING(fsg, "usb_ep_set_halt -> %d\n", rc);
|
| 1477 | rc = 0;
|
| 1478 | break;
|
| 1479 | }
|
| 1480 |
|
| 1481 |
|
| 1482 | if (msleep_interruptible(100) != 0)
|
| 1483 | return -EINTR;
|
| 1484 | rc = usb_ep_set_halt(fsg->bulk_in);
|
| 1485 | }
|
| 1486 | return rc;
|
| 1487 | }
|
| 1488 |
|
| 1489 | static int wedge_bulk_in_endpoint(struct fsg_dev *fsg)
|
| 1490 | {
|
| 1491 | int rc;
|
| 1492 |
|
| 1493 | DBG(fsg, "bulk-in set wedge\n");
|
| 1494 | rc = usb_ep_set_wedge(fsg->bulk_in);
|
| 1495 | if (rc == -EAGAIN)
|
| 1496 | VDBG(fsg, "delayed bulk-in endpoint wedge\n");
|
| 1497 | while (rc != 0) {
|
| 1498 | if (rc != -EAGAIN) {
|
| 1499 | WARNING(fsg, "usb_ep_set_wedge -> %d\n", rc);
|
| 1500 | rc = 0;
|
| 1501 | break;
|
| 1502 | }
|
| 1503 |
|
| 1504 |
|
| 1505 | if (msleep_interruptible(100) != 0)
|
| 1506 | return -EINTR;
|
| 1507 | rc = usb_ep_set_wedge(fsg->bulk_in);
|
| 1508 | }
|
| 1509 | return rc;
|
| 1510 | }
|
| 1511 |
|
| 1512 | static int throw_away_data(struct fsg_common *common)
|
| 1513 | {
|
| 1514 | struct fsg_buffhd *bh, *bh2;
|
| 1515 | u32 amount;
|
| 1516 | int rc;
|
| 1517 |
|
| 1518 | for (bh = common->next_buffhd_to_drain;
|
| 1519 | bh->state != BUF_STATE_EMPTY || common->usb_amount_left > 0;
|
| 1520 | bh = common->next_buffhd_to_drain) {
|
| 1521 |
|
| 1522 |
|
| 1523 | bh2 = common->next_buffhd_to_fill;
|
| 1524 | if (bh2->state == BUF_STATE_EMPTY &&
|
| 1525 | common->usb_amount_left > 0) {
|
| 1526 | amount = min(common->usb_amount_left, FSG_BUFLEN);
|
| 1527 |
|
| 1528 | |
| 1529 | * Except at the end of the transfer, amount will be
|
| 1530 | * equal to the buffer size, which is divisible by
|
| 1531 | * the bulk-out maxpacket size.
|
| 1532 |
|
| 1533 | set_bulk_out_req_length(common, bh2, amount);
|
| 1534 | if (!start_out_transfer(common, bh2))
|
| 1535 |
|
| 1536 | return -EIO;
|
| 1537 | common->next_buffhd_to_fill = bh2->next;
|
| 1538 | common->usb_amount_left -= amount;
|
| 1539 | continue;
|
| 1540 | }
|
| 1541 |
|
| 1542 |
|
| 1543 | rc = sleep_thread(common, false, bh);
|
| 1544 | if (rc)
|
| 1545 | return rc;
|
| 1546 |
|
| 1547 |
|
| 1548 | bh->state = BUF_STATE_EMPTY;
|
| 1549 | common->next_buffhd_to_drain = bh->next;
|
| 1550 |
|
| 1551 |
|
| 1552 | if (bh->outreq->actual < bh->bulk_out_intended_length ||
|
| 1553 | bh->outreq->status != 0) {
|
| 1554 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT);
|
| 1555 | return -EINTR;
|
| 1556 | }
|
| 1557 | }
|
| 1558 | return 0;
|
| 1559 | }
|
| 1560 |
|
| 1561 | static int finish_reply(struct fsg_common *common)
|
| 1562 | {
|
| 1563 | struct fsg_buffhd *bh = common->next_buffhd_to_fill;
|
| 1564 | int rc = 0;
|
| 1565 |
|
| 1566 | switch (common->data_dir) {
|
| 1567 | case DATA_DIR_NONE:
|
| 1568 | break;
|
| 1569 |
|
| 1570 | |
| 1571 | * If we don't know whether the host wants to read or write,
|
| 1572 | * this must be CB or CBI with an unknown command. We mustn't
|
| 1573 | * try to send or receive any data. So stall both bulk pipes
|
| 1574 | * if we can and wait for a reset.
|
| 1575 |
|
| 1576 | case DATA_DIR_UNKNOWN:
|
| 1577 | if (!common->can_stall) {
|
| 1578 |
|
| 1579 | } else if (fsg_is_set(common)) {
|
| 1580 | fsg_set_halt(common->fsg, common->fsg->bulk_out);
|
| 1581 | rc = halt_bulk_in_endpoint(common->fsg);
|
| 1582 | } else {
|
| 1583 |
|
| 1584 | rc = -EIO;
|
| 1585 | }
|
| 1586 | break;
|
| 1587 |
|
| 1588 |
|
| 1589 | case DATA_DIR_TO_HOST:
|
| 1590 | if (common->data_size == 0) {
|
| 1591 |
|
| 1592 |
|
| 1593 |
|
| 1594 | } else if (!fsg_is_set(common)) {
|
| 1595 | rc = -EIO;
|
| 1596 |
|
| 1597 |
|
| 1598 | } else if (common->residue == 0) {
|
| 1599 | bh->inreq->zero = 0;
|
| 1600 | if (!start_in_transfer(common, bh))
|
| 1601 | return -EIO;
|
| 1602 | common->next_buffhd_to_fill = bh->next;
|
| 1603 |
|
| 1604 | |
| 1605 | * For Bulk-only, mark the end of the data with a short
|
| 1606 | * packet. If we are allowed to stall, halt the bulk-in
|
| 1607 | * endpoint. (Note: This violates the Bulk-Only Transport
|
| 1608 | * specification, which requires us to pad the data if we
|
| 1609 | * don't halt the endpoint. Presumably nobody will mind.)
|
| 1610 |
|
| 1611 | } else {
|
| 1612 | bh->inreq->zero = 1;
|
| 1613 | if (!start_in_transfer(common, bh))
|
| 1614 | rc = -EIO;
|
| 1615 | common->next_buffhd_to_fill = bh->next;
|
| 1616 | if (common->can_stall)
|
| 1617 | rc = halt_bulk_in_endpoint(common->fsg);
|
| 1618 | }
|
| 1619 | break;
|
| 1620 |
|
| 1621 | |
| 1622 | * We have processed all we want from the data the host has sent.
|
| 1623 | * There may still be outstanding bulk-out requests.
|
| 1624 |
|
| 1625 | case DATA_DIR_FROM_HOST:
|
| 1626 | if (common->residue == 0) {
|
| 1627 |
|
| 1628 |
|
| 1629 |
|
| 1630 | } else if (common->short_packet_received) {
|
| 1631 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT);
|
| 1632 | rc = -EINTR;
|
| 1633 |
|
| 1634 | |
| 1635 | * We haven't processed all the incoming data. Even though
|
| 1636 | * we may be allowed to stall, doing so would cause a race.
|
| 1637 | * The controller may already have ACK'ed all the remaining
|
| 1638 | * bulk-out packets, in which case the host wouldn't see a
|
| 1639 | * STALL. Not realizing the endpoint was halted, it wouldn't
|
| 1640 | * clear the halt -- leading to problems later on.
|
| 1641 |
|
| 1642 | #if 0 |
| 1643 | } else if (common->can_stall) {
|
| 1644 | if (fsg_is_set(common))
|
| 1645 | fsg_set_halt(common->fsg,
|
| 1646 | common->fsg->bulk_out);
|
| 1647 | raise_exception(common, FSG_STATE_ABORT_BULK_OUT);
|
| 1648 | rc = -EINTR;
|
| 1649 | #endif
|
| 1650 |
|
| 1651 | |
| 1652 | * We can't stall. Read in the excess data and throw it
|
| 1653 | * all away.
|
| 1654 |
|
| 1655 | } else {
|
| 1656 | rc = throw_away_data(common);
|
| 1657 | }
|
| 1658 | break;
|
| 1659 | }
|
| 1660 | return rc;
|
| 1661 | }
|
| 1662 |
|
| 1663 | static void send_status(struct fsg_common *common)
|
| 1664 | {
|
| 1665 | struct fsg_lun *curlun = common->curlun;
|
| 1666 | struct fsg_buffhd *bh;
|
| 1667 | struct bulk_cs_wrap *csw;
|
| 1668 | int rc;
|
| 1669 | u8 status = US_BULK_STAT_OK;
|
| 1670 | u32 sd, sdinfo = 0;
|
| 1671 |
|
| 1672 |
|
| 1673 | bh = common->next_buffhd_to_fill;
|
| 1674 | rc = sleep_thread(common, false, bh);
|
| 1675 | if (rc)
|
| 1676 | return;
|
| 1677 |
|
| 1678 | if (curlun) {
|
| 1679 | sd = curlun->sense_data;
|
| 1680 | sdinfo = curlun->sense_data_info;
|
| 1681 | } else if (common->bad_lun_okay)
|
| 1682 | sd = SS_NO_SENSE;
|
| 1683 | else
|
| 1684 | sd = SS_LOGICAL_UNIT_NOT_SUPPORTED;
|
| 1685 |
|
| 1686 | if (common->phase_error) {
|
| 1687 | DBG(common, "sending phase-error status\n");
|
| 1688 | status = US_BULK_STAT_PHASE;
|
| 1689 | sd = SS_INVALID_COMMAND;
|
| 1690 | } else if (sd != SS_NO_SENSE) {
|
| 1691 | DBG(common, "sending command-failure status\n");
|
| 1692 | status = US_BULK_STAT_FAIL;
|
| 1693 | VDBG(common, " sense data: SK x%02x, ASC x%02x, ASCQ x%02x;"
|
| 1694 | " info x%x\n",
|
| 1695 | SK(sd), ASC(sd), ASCQ(sd), sdinfo);
|
| 1696 | }
|
| 1697 |
|
| 1698 |
|
| 1699 | csw = (void *)bh->buf;
|
| 1700 |
|
| 1701 | csw->Signature = cpu_to_le32(US_BULK_CS_SIGN);
|
| 1702 | csw->Tag = common->tag;
|
| 1703 | csw->Residue = cpu_to_le32(common->residue);
|
| 1704 | csw->Status = status;
|
| 1705 |
|
| 1706 | bh->inreq->length = US_BULK_CS_WRAP_LEN;
|
| 1707 | bh->inreq->zero = 0;
|
| 1708 | if (!start_in_transfer(common, bh))
|
| 1709 |
|
| 1710 | return;
|
| 1711 |
|
| 1712 | common->next_buffhd_to_fill = bh->next;
|
| 1713 | return;
|
| 1714 | }
|
| 1715 |
|
| 1716 |
|
| 1717 |
|
| 1718 |
|
| 1719 | |
| 1720 | * Check whether the command is properly formed and whether its data size
|
| 1721 | * and direction agree with the values we already have.
|
| 1722 |
|
| 1723 | static int check_command(struct fsg_common *common, int cmnd_size,
|
| 1724 | enum data_direction data_dir, unsigned int mask,
|
| 1725 | int needs_medium, const char *name)
|
| 1726 | {
|
| 1727 | int i;
|
| 1728 | unsigned int lun = common->cmnd[1] >> 5;
|
| 1729 | static const char dirletter[4] = {'u', 'o', 'i', 'n'};
|
| 1730 | char hdlen[20];
|
| 1731 | struct fsg_lun *curlun;
|
| 1732 |
|
| 1733 | hdlen[0] = 0;
|
| 1734 | if (common->data_dir != DATA_DIR_UNKNOWN)
|
| 1735 | sprintf(hdlen, ", H%c=%u", dirletter[(int) common->data_dir],
|
| 1736 | common->data_size);
|
| 1737 | VDBG(common, "SCSI command: %s; Dc=%d, D%c=%u; Hc=%d%s\n",
|
| 1738 | name, cmnd_size, dirletter[(int) data_dir],
|
| 1739 | common->data_size_from_cmnd, common->cmnd_size, hdlen);
|
| 1740 |
|
| 1741 | |
| 1742 | * We can't reply at all until we know the correct data direction
|
| 1743 | * and size.
|
| 1744 |
|
| 1745 | if (common->data_size_from_cmnd == 0)
|
| 1746 | data_dir = DATA_DIR_NONE;
|
| 1747 | if (common->data_size < common->data_size_from_cmnd) {
|
| 1748 | |
| 1749 | * Host data size < Device data size is a phase error.
|
| 1750 | * Carry out the command, but only transfer as much as
|
| 1751 | * we are allowed.
|
| 1752 |
|
| 1753 | common->data_size_from_cmnd = common->data_size;
|
| 1754 | common->phase_error = 1;
|
| 1755 | }
|
| 1756 | common->residue = common->data_size;
|
| 1757 | common->usb_amount_left = common->data_size;
|
| 1758 |
|
| 1759 |
|
| 1760 | if (common->data_dir != data_dir && common->data_size_from_cmnd > 0) {
|
| 1761 | common->phase_error = 1;
|
| 1762 | return -EINVAL;
|
| 1763 | }
|
| 1764 |
|
| 1765 |
|
| 1766 | if (cmnd_size != common->cmnd_size) {
|
| 1767 |
|
| 1768 | |
| 1769 | * Special case workaround: There are plenty of buggy SCSI
|
| 1770 | * implementations. Many have issues with cbw->Length
|
| 1771 | * field passing a wrong command size. For those cases we
|
| 1772 | * always try to work around the problem by using the length
|
| 1773 | * sent by the host side provided it is at least as large
|
| 1774 | * as the correct command length.
|
| 1775 | * Examples of such cases would be MS-Windows, which issues
|
| 1776 | * REQUEST SENSE with cbw->Length == 12 where it should
|
| 1777 | * be 6, and xbox360 issuing INQUIRY, TEST UNIT READY and
|
| 1778 | * REQUEST SENSE with cbw->Length == 10 where it should
|
| 1779 | * be 6 as well.
|
| 1780 |
|
| 1781 | if (cmnd_size <= common->cmnd_size) {
|
| 1782 | DBG(common, "%s is buggy! Expected length %d "
|
| 1783 | "but we got %d\n", name,
|
| 1784 | cmnd_size, common->cmnd_size);
|
| 1785 | cmnd_size = common->cmnd_size;
|
| 1786 | } else {
|
| 1787 | common->phase_error = 1;
|
| 1788 | return -EINVAL;
|
| 1789 | }
|
| 1790 | }
|
| 1791 |
|
| 1792 |
|
| 1793 | if (common->lun != lun)
|
| 1794 | DBG(common, "using LUN %u from CBW, not LUN %u from CDB\n",
|
| 1795 | common->lun, lun);
|
| 1796 |
|
| 1797 |
|
| 1798 | curlun = common->curlun;
|
| 1799 | if (curlun) {
|
| 1800 | if (common->cmnd[0] != REQUEST_SENSE) {
|
| 1801 | curlun->sense_data = SS_NO_SENSE;
|
| 1802 | curlun->sense_data_info = 0;
|
| 1803 | curlun->info_valid = 0;
|
| 1804 | }
|
| 1805 | } else {
|
| 1806 | common->bad_lun_okay = 0;
|
| 1807 |
|
| 1808 | |
| 1809 | * INQUIRY and REQUEST SENSE commands are explicitly allowed
|
| 1810 | * to use unsupported LUNs; all others may not.
|
| 1811 |
|
| 1812 | if (common->cmnd[0] != INQUIRY &&
|
| 1813 | common->cmnd[0] != REQUEST_SENSE) {
|
| 1814 | DBG(common, "unsupported LUN %u\n", common->lun);
|
| 1815 | return -EINVAL;
|
| 1816 | }
|
| 1817 | }
|
| 1818 |
|
| 1819 | |
| 1820 | * If a unit attention condition exists, only INQUIRY and
|
| 1821 | * REQUEST SENSE commands are allowed; anything else must fail.
|
| 1822 |
|
| 1823 | if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
|
| 1824 | common->cmnd[0] != INQUIRY &&
|
| 1825 | common->cmnd[0] != REQUEST_SENSE) {
|
| 1826 | curlun->sense_data = curlun->unit_attention_data;
|
| 1827 | curlun->unit_attention_data = SS_NO_SENSE;
|
| 1828 | return -EINVAL;
|
| 1829 | }
|
| 1830 |
|
| 1831 |
|
| 1832 | common->cmnd[1] &= 0x1f;
|
| 1833 | for (i = 1; i < cmnd_size; ++i) {
|
| 1834 | if (common->cmnd[i] && !(mask & (1 << i))) {
|
| 1835 | if (curlun)
|
| 1836 | curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
|
| 1837 | return -EINVAL;
|
| 1838 | }
|
| 1839 | }
|
| 1840 |
|
| 1841 | |
| 1842 | * it, return an error.
|
| 1843 | if (curlun && !fsg_lun_is_open(curlun) && needs_medium) {
|
| 1844 | curlun->sense_data = SS_MEDIUM_NOT_PRESENT;
|
| 1845 | return -EINVAL;
|
| 1846 | }
|
| 1847 |
|
| 1848 | return 0;
|
| 1849 | }
|
| 1850 |
|
| 1851 |
|
| 1852 | static int check_command_size_in_blocks(struct fsg_common *common,
|
| 1853 | int cmnd_size, enum data_direction data_dir,
|
| 1854 | unsigned int mask, int needs_medium, const char *name)
|
| 1855 | {
|
| 1856 | if (common->curlun) {
|
| 1857 | if (check_shl_overflow(common->data_size_from_cmnd,
|
| 1858 | common->curlun->blkbits,
|
| 1859 | &common->data_size_from_cmnd)) {
|
| 1860 | common->phase_error = 1;
|
| 1861 | return -EINVAL;
|
| 1862 | }
|
| 1863 | }
|
| 1864 |
|
| 1865 | return check_command(common, cmnd_size, data_dir,
|
| 1866 | mask, needs_medium, name);
|
| 1867 | }
|
| 1868 |
|
| 1869 | static int do_scsi_command(struct fsg_common *common)
|
| 1870 | {
|
| 1871 | struct fsg_buffhd *bh;
|
| 1872 | int rc;
|
| 1873 | int reply = -EINVAL;
|
| 1874 | int i;
|
| 1875 | static char unknown[16];
|
| 1876 |
|
| 1877 | dump_cdb(common);
|
| 1878 |
|
| 1879 |
|
| 1880 | bh = common->next_buffhd_to_fill;
|
| 1881 | common->next_buffhd_to_drain = bh;
|
| 1882 | rc = sleep_thread(common, false, bh);
|
| 1883 | if (rc)
|
| 1884 | return rc;
|
| 1885 |
|
| 1886 | common->phase_error = 0;
|
| 1887 | common->short_packet_received = 0;
|
| 1888 |
|
| 1889 | down_read(&common->filesem);
|
| 1890 | switch (common->cmnd[0]) {
|
| 1891 |
|
| 1892 | case INQUIRY:
|
| 1893 | common->data_size_from_cmnd = common->cmnd[4];
|
| 1894 | reply = check_command(common, 6, DATA_DIR_TO_HOST,
|
| 1895 | (1<<4), 0,
|
| 1896 | "INQUIRY");
|
| 1897 | if (reply == 0)
|
| 1898 | reply = do_inquiry(common, bh);
|
| 1899 | break;
|
| 1900 |
|
| 1901 | case MODE_SELECT:
|
| 1902 | common->data_size_from_cmnd = common->cmnd[4];
|
| 1903 | reply = check_command(common, 6, DATA_DIR_FROM_HOST,
|
| 1904 | (1<<1) | (1<<4), 0,
|
| 1905 | "MODE SELECT(6)");
|
| 1906 | if (reply == 0)
|
| 1907 | reply = do_mode_select(common, bh);
|
| 1908 | break;
|
| 1909 |
|
| 1910 | case MODE_SELECT_10:
|
| 1911 | common->data_size_from_cmnd =
|
| 1912 | get_unaligned_be16(&common->cmnd[7]);
|
| 1913 | reply = check_command(common, 10, DATA_DIR_FROM_HOST,
|
| 1914 | (1<<1) | (3<<7), 0,
|
| 1915 | "MODE SELECT(10)");
|
| 1916 | if (reply == 0)
|
| 1917 | reply = do_mode_select(common, bh);
|
| 1918 | break;
|
| 1919 |
|
| 1920 | case MODE_SENSE:
|
| 1921 | common->data_size_from_cmnd = common->cmnd[4];
|
| 1922 | reply = check_command(common, 6, DATA_DIR_TO_HOST,
|
| 1923 | (1<<1) | (1<<2) | (1<<4), 0,
|
| 1924 | "MODE SENSE(6)");
|
| 1925 | if (reply == 0)
|
| 1926 | reply = do_mode_sense(common, bh);
|
| 1927 | break;
|
| 1928 |
|
| 1929 | case MODE_SENSE_10:
|
| 1930 | common->data_size_from_cmnd =
|
| 1931 | get_unaligned_be16(&common->cmnd[7]);
|
| 1932 | reply = check_command(common, 10, DATA_DIR_TO_HOST,
|
| 1933 | (1<<1) | (1<<2) | (3<<7), 0,
|
| 1934 | "MODE SENSE(10)");
|
| 1935 | if (reply == 0)
|
| 1936 | reply = do_mode_sense(common, bh);
|
| 1937 | break;
|
| 1938 |
|
| 1939 | case ALLOW_MEDIUM_REMOVAL:
|
| 1940 | common->data_size_from_cmnd = 0;
|
| 1941 | reply = check_command(common, 6, DATA_DIR_NONE,
|
| 1942 | (1<<4), 0,
|
| 1943 | "PREVENT-ALLOW MEDIUM REMOVAL");
|
| 1944 | if (reply == 0)
|
| 1945 | reply = do_prevent_allow(common);
|
| 1946 | break;
|
| 1947 |
|
| 1948 | case READ_6:
|
| 1949 | i = common->cmnd[4];
|
| 1950 | common->data_size_from_cmnd = (i == 0) ? 256 : i;
|
| 1951 | reply = check_command_size_in_blocks(common, 6,
|
| 1952 | DATA_DIR_TO_HOST,
|
| 1953 | (7<<1) | (1<<4), 1,
|
| 1954 | "READ(6)");
|
| 1955 | if (reply == 0)
|
| 1956 | reply = do_read(common);
|
| 1957 | break;
|
| 1958 |
|
| 1959 | case READ_10:
|
| 1960 | common->data_size_from_cmnd =
|
| 1961 | get_unaligned_be16(&common->cmnd[7]);
|
| 1962 | reply = check_command_size_in_blocks(common, 10,
|
| 1963 | DATA_DIR_TO_HOST,
|
| 1964 | (1<<1) | (0xf<<2) | (3<<7), 1,
|
| 1965 | "READ(10)");
|
| 1966 | if (reply == 0)
|
| 1967 | reply = do_read(common);
|
| 1968 | break;
|
| 1969 |
|
| 1970 | case READ_12:
|
| 1971 | common->data_size_from_cmnd =
|
| 1972 | get_unaligned_be32(&common->cmnd[6]);
|
| 1973 | reply = check_command_size_in_blocks(common, 12,
|
| 1974 | DATA_DIR_TO_HOST,
|
| 1975 | (1<<1) | (0xf<<2) | (0xf<<6), 1,
|
| 1976 | "READ(12)");
|
| 1977 | if (reply == 0)
|
| 1978 | reply = do_read(common);
|
| 1979 | break;
|
| 1980 |
|
| 1981 | case READ_16:
|
| 1982 | common->data_size_from_cmnd =
|
| 1983 | get_unaligned_be32(&common->cmnd[10]);
|
| 1984 | reply = check_command_size_in_blocks(common, 16,
|
| 1985 | DATA_DIR_TO_HOST,
|
| 1986 | (1<<1) | (0xff<<2) | (0xf<<10), 1,
|
| 1987 | "READ(16)");
|
| 1988 | if (reply == 0)
|
| 1989 | reply = do_read(common);
|
| 1990 | break;
|
| 1991 |
|
| 1992 | case READ_CAPACITY:
|
| 1993 | common->data_size_from_cmnd = 8;
|
| 1994 | reply = check_command(common, 10, DATA_DIR_TO_HOST,
|
| 1995 | (0xf<<2) | (1<<8), 1,
|
| 1996 | "READ CAPACITY");
|
| 1997 | if (reply == 0)
|
| 1998 | reply = do_read_capacity(common, bh);
|
| 1999 | break;
|
| 2000 |
|
| 2001 | case READ_HEADER:
|
| 2002 | if (!common->curlun || !common->curlun->cdrom)
|
| 2003 | goto unknown_cmnd;
|
| 2004 | common->data_size_from_cmnd =
|
| 2005 | get_unaligned_be16(&common->cmnd[7]);
|
| 2006 | reply = check_command(common, 10, DATA_DIR_TO_HOST,
|
| 2007 | (3<<7) | (0x1f<<1), 1,
|
| 2008 | "READ HEADER");
|
| 2009 | if (reply == 0)
|
| 2010 | reply = do_read_header(common, bh);
|
| 2011 | break;
|
| 2012 |
|
| 2013 | case READ_TOC:
|
| 2014 | if (!common->curlun || !common->curlun->cdrom)
|
| 2015 | goto unknown_cmnd;
|
| 2016 | common->data_size_from_cmnd =
|
| 2017 | get_unaligned_be16(&common->cmnd[7]);
|
| 2018 | reply = check_command(common, 10, DATA_DIR_TO_HOST,
|
| 2019 | (0xf<<6) | (3<<1), 1,
|
| 2020 | "READ TOC");
|
| 2021 | if (reply == 0)
|
| 2022 | reply = do_read_toc(common, bh);
|
| 2023 | break;
|
| 2024 |
|
| 2025 | case READ_FORMAT_CAPACITIES:
|
| 2026 | common->data_size_from_cmnd =
|
| 2027 | get_unaligned_be16(&common->cmnd[7]);
|
| 2028 | reply = check_command(common, 10, DATA_DIR_TO_HOST,
|
| 2029 | (3<<7), 1,
|
| 2030 | "READ FORMAT CAPACITIES");
|
| 2031 | if (reply == 0)
|
| 2032 | reply = do_read_format_capacities(common, bh);
|
| 2033 | break;
|
| 2034 |
|
| 2035 | case REQUEST_SENSE:
|
| 2036 | common->data_size_from_cmnd = common->cmnd[4];
|
| 2037 | reply = check_command(common, 6, DATA_DIR_TO_HOST,
|
| 2038 | (1<<4), 0,
|
| 2039 | "REQUEST SENSE");
|
| 2040 | if (reply == 0)
|
| 2041 | reply = do_request_sense(common, bh);
|
| 2042 | break;
|
| 2043 |
|
| 2044 | case SERVICE_ACTION_IN_16:
|
| 2045 | switch (common->cmnd[1] & 0x1f) {
|
| 2046 |
|
| 2047 | case SAI_READ_CAPACITY_16:
|
| 2048 | common->data_size_from_cmnd =
|
| 2049 | get_unaligned_be32(&common->cmnd[10]);
|
| 2050 | reply = check_command(common, 16, DATA_DIR_TO_HOST,
|
| 2051 | (1<<1) | (0xff<<2) | (0xf<<10) |
|
| 2052 | (1<<14), 1,
|
| 2053 | "READ CAPACITY(16)");
|
| 2054 | if (reply == 0)
|
| 2055 | reply = do_read_capacity_16(common, bh);
|
| 2056 | break;
|
| 2057 |
|
| 2058 | default:
|
| 2059 | goto unknown_cmnd;
|
| 2060 | }
|
| 2061 | break;
|
| 2062 |
|
| 2063 | case START_STOP:
|
| 2064 | common->data_size_from_cmnd = 0;
|
| 2065 | reply = check_command(common, 6, DATA_DIR_NONE,
|
| 2066 | (1<<1) | (1<<4), 0,
|
| 2067 | "START-STOP UNIT");
|
| 2068 | if (reply == 0)
|
| 2069 | reply = do_start_stop(common);
|
| 2070 | break;
|
| 2071 |
|
| 2072 | case SYNCHRONIZE_CACHE:
|
| 2073 | common->data_size_from_cmnd = 0;
|
| 2074 | reply = check_command(common, 10, DATA_DIR_NONE,
|
| 2075 | (0xf<<2) | (3<<7), 1,
|
| 2076 | "SYNCHRONIZE CACHE");
|
| 2077 | if (reply == 0)
|
| 2078 | reply = do_synchronize_cache(common);
|
| 2079 | break;
|
| 2080 |
|
| 2081 | case TEST_UNIT_READY:
|
| 2082 | common->data_size_from_cmnd = 0;
|
| 2083 | reply = check_command(common, 6, DATA_DIR_NONE,
|
| 2084 | 0, 1,
|
| 2085 | "TEST UNIT READY");
|
| 2086 | break;
|
| 2087 |
|
| 2088 | |
| 2089 | * Although optional, this command is used by MS-Windows. We
|
| 2090 | * support a minimal version: BytChk must be 0.
|
| 2091 |
|
| 2092 | case VERIFY:
|
| 2093 | common->data_size_from_cmnd = 0;
|
| 2094 | reply = check_command(common, 10, DATA_DIR_NONE,
|
| 2095 | (1<<1) | (0xf<<2) | (3<<7), 1,
|
| 2096 | "VERIFY");
|
| 2097 | if (reply == 0)
|
| 2098 | reply = do_verify(common);
|
| 2099 | break;
|
| 2100 |
|
| 2101 | case WRITE_6:
|
| 2102 | i = common->cmnd[4];
|
| 2103 | common->data_size_from_cmnd = (i == 0) ? 256 : i;
|
| 2104 | reply = check_command_size_in_blocks(common, 6,
|
| 2105 | DATA_DIR_FROM_HOST,
|
| 2106 | (7<<1) | (1<<4), 1,
|
| 2107 | "WRITE(6)");
|
| 2108 | if (reply == 0)
|
| 2109 | reply = do_write(common);
|
| 2110 | break;
|
| 2111 |
|
| 2112 | case WRITE_10:
|
| 2113 | common->data_size_from_cmnd =
|
| 2114 | get_unaligned_be16(&common->cmnd[7]);
|
| 2115 | reply = check_command_size_in_blocks(common, 10,
|
| 2116 | DATA_DIR_FROM_HOST,
|
| 2117 | (1<<1) | (0xf<<2) | (3<<7), 1,
|
| 2118 | "WRITE(10)");
|
| 2119 | if (reply == 0)
|
| 2120 | reply = do_write(common);
|
| 2121 | break;
|
| 2122 |
|
| 2123 | case WRITE_12:
|
| 2124 | common->data_size_from_cmnd =
|
| 2125 | get_unaligned_be32(&common->cmnd[6]);
|
| 2126 | reply = check_command_size_in_blocks(common, 12,
|
| 2127 | DATA_DIR_FROM_HOST,
|
| 2128 | (1<<1) | (0xf<<2) | (0xf<<6), 1,
|
| 2129 | "WRITE(12)");
|
| 2130 | if (reply == 0)
|
| 2131 | reply = do_write(common);
|
| 2132 | break;
|
| 2133 |
|
| 2134 | case WRITE_16:
|
| 2135 | common->data_size_from_cmnd =
|
| 2136 | get_unaligned_be32(&common->cmnd[10]);
|
| 2137 | reply = check_command_size_in_blocks(common, 16,
|
| 2138 | DATA_DIR_FROM_HOST,
|
| 2139 | (1<<1) | (0xff<<2) | (0xf<<10), 1,
|
| 2140 | "WRITE(16)");
|
| 2141 | if (reply == 0)
|
| 2142 | reply = do_write(common);
|
| 2143 | break;
|
| 2144 |
|
| 2145 | |
| 2146 | * Some mandatory commands that we recognize but don't implement.
|
| 2147 | * They don't mean much in this setting. It's left as an exercise
|
| 2148 | * for anyone interested to implement RESERVE and RELEASE in terms
|
| 2149 | * of Posix locks.
|
| 2150 |
|
| 2151 | case FORMAT_UNIT:
|
| 2152 | case RELEASE_6:
|
| 2153 | case RESERVE_6:
|
| 2154 | case SEND_DIAGNOSTIC:
|
| 2155 |
|
| 2156 | default:
|
| 2157 | unknown_cmnd:
|
| 2158 | common->data_size_from_cmnd = 0;
|
| 2159 | sprintf(unknown, "Unknown x%02x", common->cmnd[0]);
|
| 2160 | reply = check_command(common, common->cmnd_size,
|
| 2161 | DATA_DIR_UNKNOWN, ~0, 0, unknown);
|
| 2162 | if (reply == 0) {
|
| 2163 | common->curlun->sense_data = SS_INVALID_COMMAND;
|
| 2164 | reply = -EINVAL;
|
| 2165 | }
|
| 2166 | break;
|
| 2167 | }
|
| 2168 | up_read(&common->filesem);
|
| 2169 |
|
| 2170 | if (reply == -EINTR || signal_pending(current))
|
| 2171 | return -EINTR;
|
| 2172 |
|
| 2173 |
|
| 2174 | if (reply == -EINVAL)
|
| 2175 | reply = 0;
|
| 2176 | if (reply >= 0 && common->data_dir == DATA_DIR_TO_HOST) {
|
| 2177 | reply = min_t(u32, reply, common->data_size_from_cmnd);
|
| 2178 | bh->inreq->length = reply;
|
| 2179 | bh->state = BUF_STATE_FULL;
|
| 2180 | common->residue -= reply;
|
| 2181 | }
|
| 2182 |
|
| 2183 | return 0;
|
| 2184 | }
|
| 2185 |
|
| 2186 |
|
| 2187 |
|
| 2188 |
|
| 2189 | static int received_cbw(struct fsg_dev *fsg, struct fsg_buffhd *bh)
|
| 2190 | {
|
| 2191 | struct usb_request *req = bh->outreq;
|
| 2192 | struct bulk_cb_wrap *cbw = req->buf;
|
| 2193 | struct fsg_common *common = fsg->common;
|
| 2194 |
|
| 2195 |
|
| 2196 | if (req->status || test_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags))
|
| 2197 | return -EINVAL;
|
| 2198 |
|
| 2199 |
|
| 2200 | if (req->actual != US_BULK_CB_WRAP_LEN ||
|
| 2201 | cbw->Signature != cpu_to_le32(
|
| 2202 | US_BULK_CB_SIGN)) {
|
| 2203 | DBG(fsg, "invalid CBW: len %u sig 0x%x\n",
|
| 2204 | req->actual,
|
| 2205 | le32_to_cpu(cbw->Signature));
|
| 2206 |
|
| 2207 | |
| 2208 | * The Bulk-only spec says we MUST stall the IN endpoint
|
| 2209 | * (6.6.1), so it's unavoidable. It also says we must
|
| 2210 | * retain this state until the next reset, but there's
|
| 2211 | * no way to tell the controller driver it should ignore
|
| 2212 | * Clear-Feature(HALT) requests.
|
| 2213 | *
|
| 2214 | * We aren't required to halt the OUT endpoint; instead
|
| 2215 | * we can simply accept and discard any data received
|
| 2216 | * until the next reset.
|
| 2217 |
|
| 2218 | wedge_bulk_in_endpoint(fsg);
|
| 2219 | set_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
|
| 2220 | return -EINVAL;
|
| 2221 | }
|
| 2222 |
|
| 2223 |
|
| 2224 | if (cbw->Lun >= ARRAY_SIZE(common->luns) ||
|
| 2225 | cbw->Flags & ~US_BULK_FLAG_IN || cbw->Length <= 0 ||
|
| 2226 | cbw->Length > MAX_COMMAND_SIZE) {
|
| 2227 | DBG(fsg, "non-meaningful CBW: lun = %u, flags = 0x%x, "
|
| 2228 | "cmdlen %u\n",
|
| 2229 | cbw->Lun, cbw->Flags, cbw->Length);
|
| 2230 |
|
| 2231 | |
| 2232 | * We can do anything we want here, so let's stall the
|
| 2233 | * bulk pipes if we are allowed to.
|
| 2234 |
|
| 2235 | if (common->can_stall) {
|
| 2236 | fsg_set_halt(fsg, fsg->bulk_out);
|
| 2237 | halt_bulk_in_endpoint(fsg);
|
| 2238 | }
|
| 2239 | return -EINVAL;
|
| 2240 | }
|
| 2241 |
|
| 2242 |
|
| 2243 | common->cmnd_size = cbw->Length;
|
| 2244 | memcpy(common->cmnd, cbw->CDB, common->cmnd_size);
|
| 2245 | if (cbw->Flags & US_BULK_FLAG_IN)
|
| 2246 | common->data_dir = DATA_DIR_TO_HOST;
|
| 2247 | else
|
| 2248 | common->data_dir = DATA_DIR_FROM_HOST;
|
| 2249 | common->data_size = le32_to_cpu(cbw->DataTransferLength);
|
| 2250 | if (common->data_size == 0)
|
| 2251 | common->data_dir = DATA_DIR_NONE;
|
| 2252 | common->lun = cbw->Lun;
|
| 2253 | if (common->lun < ARRAY_SIZE(common->luns))
|
| 2254 | common->curlun = common->luns[common->lun];
|
| 2255 | else
|
| 2256 | common->curlun = NULL;
|
| 2257 | common->tag = cbw->Tag;
|
| 2258 | return 0;
|
| 2259 | }
|
| 2260 |
|
| 2261 | static int get_next_command(struct fsg_common *common)
|
| 2262 | {
|
| 2263 | struct fsg_buffhd *bh;
|
| 2264 | int rc = 0;
|
| 2265 |
|
| 2266 |
|
| 2267 | bh = common->next_buffhd_to_fill;
|
| 2268 | rc = sleep_thread(common, true, bh);
|
| 2269 | if (rc)
|
| 2270 | return rc;
|
| 2271 |
|
| 2272 |
|
| 2273 | set_bulk_out_req_length(common, bh, US_BULK_CB_WRAP_LEN);
|
| 2274 | if (!start_out_transfer(common, bh))
|
| 2275 |
|
| 2276 | return -EIO;
|
| 2277 |
|
| 2278 | |
| 2279 | * We will drain the buffer in software, which means we
|
| 2280 | * can reuse it for the next filling. No need to advance
|
| 2281 | * next_buffhd_to_fill.
|
| 2282 |
|
| 2283 |
|
| 2284 |
|
| 2285 | rc = sleep_thread(common, true, bh);
|
| 2286 | if (rc)
|
| 2287 | return rc;
|
| 2288 |
|
| 2289 | rc = fsg_is_set(common) ? received_cbw(common->fsg, bh) : -EIO;
|
| 2290 | bh->state = BUF_STATE_EMPTY;
|
| 2291 |
|
| 2292 | return rc;
|
| 2293 | }
|
| 2294 |
|
| 2295 |
|
| 2296 |
|
| 2297 |
|
| 2298 | static int alloc_request(struct fsg_common *common, struct usb_ep *ep,
|
| 2299 | struct usb_request **preq)
|
| 2300 | {
|
| 2301 | *preq = usb_ep_alloc_request(ep, GFP_ATOMIC);
|
| 2302 | if (*preq)
|
| 2303 | return 0;
|
| 2304 | ERROR(common, "can't allocate request for %s\n", ep->name);
|
| 2305 | return -ENOMEM;
|
| 2306 | }
|
| 2307 |
|
| 2308 |
|
| 2309 | static int do_set_interface(struct fsg_common *common, struct fsg_dev *new_fsg)
|
| 2310 | {
|
| 2311 | struct fsg_dev *fsg;
|
| 2312 | int i, rc = 0;
|
| 2313 |
|
| 2314 | if (common->running)
|
| 2315 | DBG(common, "reset interface\n");
|
| 2316 |
|
| 2317 | reset:
|
| 2318 |
|
| 2319 | if (common->fsg) {
|
| 2320 | fsg = common->fsg;
|
| 2321 |
|
| 2322 | for (i = 0; i < common->fsg_num_buffers; ++i) {
|
| 2323 | struct fsg_buffhd *bh = &common->buffhds[i];
|
| 2324 |
|
| 2325 | if (bh->inreq) {
|
| 2326 | usb_ep_free_request(fsg->bulk_in, bh->inreq);
|
| 2327 | bh->inreq = NULL;
|
| 2328 | }
|
| 2329 | if (bh->outreq) {
|
| 2330 | usb_ep_free_request(fsg->bulk_out, bh->outreq);
|
| 2331 | bh->outreq = NULL;
|
| 2332 | }
|
| 2333 | }
|
| 2334 |
|
| 2335 |
|
| 2336 | if (fsg->bulk_in_enabled) {
|
| 2337 | usb_ep_disable(fsg->bulk_in);
|
| 2338 | fsg->bulk_in_enabled = 0;
|
| 2339 | }
|
| 2340 | if (fsg->bulk_out_enabled) {
|
| 2341 | usb_ep_disable(fsg->bulk_out);
|
| 2342 | fsg->bulk_out_enabled = 0;
|
| 2343 | }
|
| 2344 |
|
| 2345 | common->fsg = NULL;
|
| 2346 | wake_up(&common->fsg_wait);
|
| 2347 | }
|
| 2348 |
|
| 2349 | common->running = 0;
|
| 2350 | if (!new_fsg || rc)
|
| 2351 | return rc;
|
| 2352 |
|
| 2353 | common->fsg = new_fsg;
|
| 2354 | fsg = common->fsg;
|
| 2355 |
|
| 2356 |
|
| 2357 | rc = config_ep_by_speed(common->gadget, &(fsg->function), fsg->bulk_in);
|
| 2358 | if (rc)
|
| 2359 | goto reset;
|
| 2360 | rc = usb_ep_enable(fsg->bulk_in);
|
| 2361 | if (rc)
|
| 2362 | goto reset;
|
| 2363 | fsg->bulk_in->driver_data = common;
|
| 2364 | fsg->bulk_in_enabled = 1;
|
| 2365 |
|
| 2366 | rc = config_ep_by_speed(common->gadget, &(fsg->function),
|
| 2367 | fsg->bulk_out);
|
| 2368 | if (rc)
|
| 2369 | goto reset;
|
| 2370 | rc = usb_ep_enable(fsg->bulk_out);
|
| 2371 | if (rc)
|
| 2372 | goto reset;
|
| 2373 | fsg->bulk_out->driver_data = common;
|
| 2374 | fsg->bulk_out_enabled = 1;
|
| 2375 | common->bulk_out_maxpacket = usb_endpoint_maxp(fsg->bulk_out->desc);
|
| 2376 | clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
|
| 2377 |
|
| 2378 |
|
| 2379 | for (i = 0; i < common->fsg_num_buffers; ++i) {
|
| 2380 | struct fsg_buffhd *bh = &common->buffhds[i];
|
| 2381 |
|
| 2382 | rc = alloc_request(common, fsg->bulk_in, &bh->inreq);
|
| 2383 | if (rc)
|
| 2384 | goto reset;
|
| 2385 | rc = alloc_request(common, fsg->bulk_out, &bh->outreq);
|
| 2386 | if (rc)
|
| 2387 | goto reset;
|
| 2388 | bh->inreq->buf = bh->outreq->buf = bh->buf;
|
| 2389 | bh->inreq->context = bh->outreq->context = bh;
|
| 2390 | bh->inreq->complete = bulk_in_complete;
|
| 2391 | bh->outreq->complete = bulk_out_complete;
|
| 2392 | }
|
| 2393 |
|
| 2394 | common->running = 1;
|
| 2395 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i)
|
| 2396 | if (common->luns[i])
|
| 2397 | common->luns[i]->unit_attention_data =
|
| 2398 | SS_RESET_OCCURRED;
|
| 2399 | return rc;
|
| 2400 | }
|
| 2401 |
|
| 2402 |
|
| 2403 |
|
| 2404 |
|
| 2405 | static int fsg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
|
| 2406 | {
|
| 2407 | struct fsg_dev *fsg = fsg_from_func(f);
|
| 2408 |
|
| 2409 | __raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE, fsg);
|
| 2410 | return USB_GADGET_DELAYED_STATUS;
|
| 2411 | }
|
| 2412 |
|
| 2413 | static void fsg_disable(struct usb_function *f)
|
| 2414 | {
|
| 2415 | struct fsg_dev *fsg = fsg_from_func(f);
|
| 2416 |
|
| 2417 |
|
| 2418 | if (fsg->bulk_in_enabled) {
|
| 2419 | usb_ep_disable(fsg->bulk_in);
|
| 2420 | fsg->bulk_in_enabled = 0;
|
| 2421 | }
|
| 2422 | if (fsg->bulk_out_enabled) {
|
| 2423 | usb_ep_disable(fsg->bulk_out);
|
| 2424 | fsg->bulk_out_enabled = 0;
|
| 2425 | }
|
| 2426 |
|
| 2427 | __raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE, NULL);
|
| 2428 | }
|
| 2429 |
|
| 2430 |
|
| 2431 |
|
| 2432 |
|
| 2433 | static void handle_exception(struct fsg_common *common)
|
| 2434 | {
|
| 2435 | int i;
|
| 2436 | struct fsg_buffhd *bh;
|
| 2437 | enum fsg_state old_state;
|
| 2438 | struct fsg_lun *curlun;
|
| 2439 | unsigned int exception_req_tag;
|
| 2440 | struct fsg_dev *new_fsg;
|
| 2441 |
|
| 2442 | |
| 2443 | * Clear the existing signals. Anything but SIGUSR1 is converted
|
| 2444 | * into a high-priority EXIT exception.
|
| 2445 |
|
| 2446 | for (;;) {
|
| 2447 | int sig = kernel_dequeue_signal();
|
| 2448 | if (!sig)
|
| 2449 | break;
|
| 2450 | if (sig != SIGUSR1) {
|
| 2451 | spin_lock_irq(&common->lock);
|
| 2452 | if (common->state < FSG_STATE_EXIT)
|
| 2453 | DBG(common, "Main thread exiting on signal\n");
|
| 2454 | common->state = FSG_STATE_EXIT;
|
| 2455 | spin_unlock_irq(&common->lock);
|
| 2456 | }
|
| 2457 | }
|
| 2458 |
|
| 2459 |
|
| 2460 | if (likely(common->fsg)) {
|
| 2461 | for (i = 0; i < common->fsg_num_buffers; ++i) {
|
| 2462 | bh = &common->buffhds[i];
|
| 2463 | if (bh->state == BUF_STATE_SENDING)
|
| 2464 | usb_ep_dequeue(common->fsg->bulk_in, bh->inreq);
|
| 2465 | if (bh->state == BUF_STATE_RECEIVING)
|
| 2466 | usb_ep_dequeue(common->fsg->bulk_out,
|
| 2467 | bh->outreq);
|
| 2468 |
|
| 2469 |
|
| 2470 | if (sleep_thread(common, false, bh))
|
| 2471 | return;
|
| 2472 | }
|
| 2473 |
|
| 2474 |
|
| 2475 | if (common->fsg->bulk_in_enabled)
|
| 2476 | usb_ep_fifo_flush(common->fsg->bulk_in);
|
| 2477 | if (common->fsg->bulk_out_enabled)
|
| 2478 | usb_ep_fifo_flush(common->fsg->bulk_out);
|
| 2479 | }
|
| 2480 |
|
| 2481 | |
| 2482 | * Reset the I/O buffer states and pointers, the SCSI
|
| 2483 | * state, and the exception. Then invoke the handler.
|
| 2484 |
|
| 2485 | spin_lock_irq(&common->lock);
|
| 2486 |
|
| 2487 | for (i = 0; i < common->fsg_num_buffers; ++i) {
|
| 2488 | bh = &common->buffhds[i];
|
| 2489 | bh->state = BUF_STATE_EMPTY;
|
| 2490 | }
|
| 2491 | common->next_buffhd_to_fill = &common->buffhds[0];
|
| 2492 | common->next_buffhd_to_drain = &common->buffhds[0];
|
| 2493 | exception_req_tag = common->exception_req_tag;
|
| 2494 | new_fsg = common->exception_arg;
|
| 2495 | old_state = common->state;
|
| 2496 | common->state = FSG_STATE_NORMAL;
|
| 2497 |
|
| 2498 | if (old_state != FSG_STATE_ABORT_BULK_OUT) {
|
| 2499 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) {
|
| 2500 | curlun = common->luns[i];
|
| 2501 | if (!curlun)
|
| 2502 | continue;
|
| 2503 | curlun->prevent_medium_removal = 0;
|
| 2504 | curlun->sense_data = SS_NO_SENSE;
|
| 2505 | curlun->unit_attention_data = SS_NO_SENSE;
|
| 2506 | curlun->sense_data_info = 0;
|
| 2507 | curlun->info_valid = 0;
|
| 2508 | }
|
| 2509 | }
|
| 2510 | spin_unlock_irq(&common->lock);
|
| 2511 |
|
| 2512 |
|
| 2513 | switch (old_state) {
|
| 2514 | case FSG_STATE_NORMAL:
|
| 2515 | break;
|
| 2516 |
|
| 2517 | case FSG_STATE_ABORT_BULK_OUT:
|
| 2518 | send_status(common);
|
| 2519 | break;
|
| 2520 |
|
| 2521 | case FSG_STATE_PROTOCOL_RESET:
|
| 2522 | |
| 2523 | * In case we were forced against our will to halt a
|
| 2524 | * bulk endpoint, clear the halt now. (The SuperH UDC
|
| 2525 | * requires this.)
|
| 2526 |
|
| 2527 | if (!fsg_is_set(common))
|
| 2528 | break;
|
| 2529 | if (test_and_clear_bit(IGNORE_BULK_OUT,
|
| 2530 | &common->fsg->atomic_bitflags))
|
| 2531 | usb_ep_clear_halt(common->fsg->bulk_in);
|
| 2532 |
|
| 2533 | if (common->ep0_req_tag == exception_req_tag)
|
| 2534 | ep0_queue(common);
|
| 2535 |
|
| 2536 | |
| 2537 | * Technically this should go here, but it would only be
|
| 2538 | * a waste of time. Ditto for the INTERFACE_CHANGE and
|
| 2539 | * CONFIG_CHANGE cases.
|
| 2540 |
|
| 2541 |
|
| 2542 |
|
| 2543 |
|
| 2544 |
|
| 2545 | break;
|
| 2546 |
|
| 2547 | case FSG_STATE_CONFIG_CHANGE:
|
| 2548 | do_set_interface(common, new_fsg);
|
| 2549 | if (new_fsg)
|
| 2550 | usb_composite_setup_continue(common->cdev);
|
| 2551 | break;
|
| 2552 |
|
| 2553 | case FSG_STATE_EXIT:
|
| 2554 | do_set_interface(common, NULL);
|
| 2555 | spin_lock_irq(&common->lock);
|
| 2556 | common->state = FSG_STATE_TERMINATED;
|
| 2557 | spin_unlock_irq(&common->lock);
|
| 2558 | break;
|
| 2559 |
|
| 2560 | case FSG_STATE_TERMINATED:
|
| 2561 | break;
|
| 2562 | }
|
| 2563 | }
|
| 2564 |
|
| 2565 |
|
| 2566 |
|
| 2567 |
|
| 2568 | static int fsg_main_thread(void *common_)
|
| 2569 | {
|
| 2570 | struct fsg_common *common = common_;
|
| 2571 | int i;
|
| 2572 |
|
| 2573 | |
| 2574 | * Allow the thread to be killed by a signal, but set the signal mask
|
| 2575 | * to block everything but INT, TERM, KILL, and USR1.
|
| 2576 |
|
| 2577 | allow_signal(SIGINT);
|
| 2578 | allow_signal(SIGTERM);
|
| 2579 | allow_signal(SIGKILL);
|
| 2580 | allow_signal(SIGUSR1);
|
| 2581 |
|
| 2582 |
|
| 2583 | set_freezable();
|
| 2584 |
|
| 2585 |
|
| 2586 | while (common->state != FSG_STATE_TERMINATED) {
|
| 2587 | if (exception_in_progress(common) || signal_pending(current)) {
|
| 2588 | handle_exception(common);
|
| 2589 | continue;
|
| 2590 | }
|
| 2591 |
|
| 2592 | if (!common->running) {
|
| 2593 | sleep_thread(common, true, NULL);
|
| 2594 | continue;
|
| 2595 | }
|
| 2596 |
|
| 2597 | if (get_next_command(common) || exception_in_progress(common))
|
| 2598 | continue;
|
| 2599 | if (do_scsi_command(common) || exception_in_progress(common))
|
| 2600 | continue;
|
| 2601 | if (finish_reply(common) || exception_in_progress(common))
|
| 2602 | continue;
|
| 2603 | send_status(common);
|
| 2604 | }
|
| 2605 |
|
| 2606 | spin_lock_irq(&common->lock);
|
| 2607 | common->thread_task = NULL;
|
| 2608 | spin_unlock_irq(&common->lock);
|
| 2609 |
|
| 2610 |
|
| 2611 |
|
| 2612 | down_write(&common->filesem);
|
| 2613 | for (i = 0; i < ARRAY_SIZE(common->luns); i++) {
|
| 2614 | struct fsg_lun *curlun = common->luns[i];
|
| 2615 |
|
| 2616 | if (curlun && fsg_lun_is_open(curlun))
|
| 2617 | fsg_lun_close(curlun);
|
| 2618 | }
|
| 2619 | up_write(&common->filesem);
|
| 2620 |
|
| 2621 |
|
| 2622 | kthread_complete_and_exit(&common->thread_notifier, 0);
|
| 2623 | }
|
| 2624 |
|
| 2625 |
|
| 2626 |
|
| 2627 |
|
| 2628 | static ssize_t ro_show(struct device *dev, struct device_attribute *attr, char *buf)
|
| 2629 | {
|
| 2630 | struct fsg_lun *curlun = fsg_lun_from_dev(dev);
|
| 2631 |
|
| 2632 | return fsg_show_ro(curlun, buf);
|
| 2633 | }
|
| 2634 |
|
| 2635 | static ssize_t nofua_show(struct device *dev, struct device_attribute *attr,
|
| 2636 | char *buf)
|
| 2637 | {
|
| 2638 | struct fsg_lun *curlun = fsg_lun_from_dev(dev);
|
| 2639 |
|
| 2640 | return fsg_show_nofua(curlun, buf);
|
| 2641 | }
|
| 2642 |
|
| 2643 | static ssize_t file_show(struct device *dev, struct device_attribute *attr,
|
| 2644 | char *buf)
|
| 2645 | {
|
| 2646 | struct fsg_lun *curlun = fsg_lun_from_dev(dev);
|
| 2647 | struct rw_semaphore *filesem = dev_get_drvdata(dev);
|
| 2648 |
|
| 2649 | return fsg_show_file(curlun, filesem, buf);
|
| 2650 | }
|
| 2651 |
|
| 2652 | static ssize_t ro_store(struct device *dev, struct device_attribute *attr,
|
| 2653 | const char *buf, size_t count)
|
| 2654 | {
|
| 2655 | struct fsg_lun *curlun = fsg_lun_from_dev(dev);
|
| 2656 | struct rw_semaphore *filesem = dev_get_drvdata(dev);
|
| 2657 |
|
| 2658 | return fsg_store_ro(curlun, filesem, buf, count);
|
| 2659 | }
|
| 2660 |
|
| 2661 | static ssize_t nofua_store(struct device *dev, struct device_attribute *attr,
|
| 2662 | const char *buf, size_t count)
|
| 2663 | {
|
| 2664 | struct fsg_lun *curlun = fsg_lun_from_dev(dev);
|
| 2665 |
|
| 2666 | return fsg_store_nofua(curlun, buf, count);
|
| 2667 | }
|
| 2668 |
|
| 2669 | static ssize_t file_store(struct device *dev, struct device_attribute *attr,
|
| 2670 | const char *buf, size_t count)
|
| 2671 | {
|
| 2672 | struct fsg_lun *curlun = fsg_lun_from_dev(dev);
|
| 2673 | struct rw_semaphore *filesem = dev_get_drvdata(dev);
|
| 2674 |
|
| 2675 | return fsg_store_file(curlun, filesem, buf, count);
|
| 2676 | }
|
| 2677 |
|
| 2678 | static ssize_t forced_eject_store(struct device *dev,
|
| 2679 | struct device_attribute *attr,
|
| 2680 | const char *buf, size_t count)
|
| 2681 | {
|
| 2682 | struct fsg_lun *curlun = fsg_lun_from_dev(dev);
|
| 2683 | struct rw_semaphore *filesem = dev_get_drvdata(dev);
|
| 2684 |
|
| 2685 | return fsg_store_forced_eject(curlun, filesem, buf, count);
|
| 2686 | }
|
| 2687 |
|
| 2688 | static DEVICE_ATTR_RW(nofua);
|
| 2689 | static DEVICE_ATTR_WO(forced_eject);
|
| 2690 |
|
| 2691 | |
| 2692 | * Mode of the ro and file attribute files will be overridden in
|
| 2693 | * fsg_lun_dev_is_visible() depending on if this is a cdrom, or if it is a
|
| 2694 | * removable device.
|
| 2695 |
|
| 2696 | static DEVICE_ATTR_RW(ro);
|
| 2697 | static DEVICE_ATTR_RW(file);
|
| 2698 |
|
| 2699 |
|
| 2700 |
|
| 2701 | static void fsg_lun_release(struct device *dev)
|
| 2702 | {
|
| 2703 |
|
| 2704 | }
|
| 2705 |
|
| 2706 | static struct fsg_common *fsg_common_setup(struct fsg_common *common)
|
| 2707 | {
|
| 2708 | if (!common) {
|
| 2709 | common = kzalloc_obj(*common);
|
| 2710 | if (!common)
|
| 2711 | return ERR_PTR(-ENOMEM);
|
| 2712 | common->free_storage_on_release = 1;
|
| 2713 | } else {
|
| 2714 | common->free_storage_on_release = 0;
|
| 2715 | }
|
| 2716 | init_rwsem(&common->filesem);
|
| 2717 | spin_lock_init(&common->lock);
|
| 2718 | init_completion(&common->thread_notifier);
|
| 2719 | init_waitqueue_head(&common->io_wait);
|
| 2720 | init_waitqueue_head(&common->fsg_wait);
|
| 2721 | common->state = FSG_STATE_TERMINATED;
|
| 2722 | memset(common->luns, 0, sizeof(common->luns));
|
| 2723 |
|
| 2724 | return common;
|
| 2725 | }
|
| 2726 |
|
| 2727 | void fsg_common_set_sysfs(struct fsg_common *common, bool sysfs)
|
| 2728 | {
|
| 2729 | common->sysfs = sysfs;
|
| 2730 | }
|
| 2731 | EXPORT_SYMBOL_GPL(fsg_common_set_sysfs);
|
| 2732 |
|
| 2733 | static void _fsg_common_free_buffers(struct fsg_buffhd *buffhds, unsigned n)
|
| 2734 | {
|
| 2735 | if (buffhds) {
|
| 2736 | struct fsg_buffhd *bh = buffhds;
|
| 2737 | while (n--) {
|
| 2738 | kfree(bh->buf);
|
| 2739 | ++bh;
|
| 2740 | }
|
| 2741 | kfree(buffhds);
|
| 2742 | }
|
| 2743 | }
|
| 2744 |
|
| 2745 | int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n)
|
| 2746 | {
|
| 2747 | struct fsg_buffhd *bh, *buffhds;
|
| 2748 | int i;
|
| 2749 |
|
| 2750 | if (n < 2)
|
| 2751 | return -EINVAL;
|
| 2752 |
|
| 2753 | buffhds = kzalloc_objs(*buffhds, n);
|
| 2754 | if (!buffhds)
|
| 2755 | return -ENOMEM;
|
| 2756 |
|
| 2757 |
|
| 2758 | bh = buffhds;
|
| 2759 | i = n;
|
| 2760 | goto buffhds_first_it;
|
| 2761 | do {
|
| 2762 | bh->next = bh + 1;
|
| 2763 | ++bh;
|
| 2764 | buffhds_first_it:
|
| 2765 | bh->buf = kmalloc(FSG_BUFLEN, GFP_KERNEL);
|
| 2766 | if (unlikely(!bh->buf))
|
| 2767 | goto error_release;
|
| 2768 | } while (--i);
|
| 2769 | bh->next = buffhds;
|
| 2770 |
|
| 2771 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers);
|
| 2772 | common->fsg_num_buffers = n;
|
| 2773 | common->buffhds = buffhds;
|
| 2774 |
|
| 2775 | return 0;
|
| 2776 |
|
| 2777 | error_release:
|
| 2778 | |
| 2779 | * "buf"s pointed to by heads after n - i are NULL
|
| 2780 | * so releasing them won't hurt
|
| 2781 |
|
| 2782 | _fsg_common_free_buffers(buffhds, n);
|
| 2783 |
|
| 2784 | return -ENOMEM;
|
| 2785 | }
|
| 2786 | EXPORT_SYMBOL_GPL(fsg_common_set_num_buffers);
|
| 2787 |
|
| 2788 | void fsg_common_remove_lun(struct fsg_lun *lun)
|
| 2789 | {
|
| 2790 | if (device_is_registered(&lun->dev))
|
| 2791 | device_unregister(&lun->dev);
|
| 2792 | fsg_lun_close(lun);
|
| 2793 | kfree(lun);
|
| 2794 | }
|
| 2795 | EXPORT_SYMBOL_GPL(fsg_common_remove_lun);
|
| 2796 |
|
| 2797 | static void _fsg_common_remove_luns(struct fsg_common *common, int n)
|
| 2798 | {
|
| 2799 | int i;
|
| 2800 |
|
| 2801 | for (i = 0; i < n; ++i)
|
| 2802 | if (common->luns[i]) {
|
| 2803 | fsg_common_remove_lun(common->luns[i]);
|
| 2804 | common->luns[i] = NULL;
|
| 2805 | }
|
| 2806 | }
|
| 2807 |
|
| 2808 | void fsg_common_remove_luns(struct fsg_common *common)
|
| 2809 | {
|
| 2810 | _fsg_common_remove_luns(common, ARRAY_SIZE(common->luns));
|
| 2811 | }
|
| 2812 | EXPORT_SYMBOL_GPL(fsg_common_remove_luns);
|
| 2813 |
|
| 2814 | void fsg_common_free_buffers(struct fsg_common *common)
|
| 2815 | {
|
| 2816 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers);
|
| 2817 | common->buffhds = NULL;
|
| 2818 | }
|
| 2819 | EXPORT_SYMBOL_GPL(fsg_common_free_buffers);
|
| 2820 |
|
| 2821 | int fsg_common_set_cdev(struct fsg_common *common,
|
| 2822 | struct usb_composite_dev *cdev, bool can_stall)
|
| 2823 | {
|
| 2824 | struct usb_string *us;
|
| 2825 |
|
| 2826 | common->gadget = cdev->gadget;
|
| 2827 | common->ep0 = cdev->gadget->ep0;
|
| 2828 | common->ep0req = cdev->req;
|
| 2829 | common->cdev = cdev;
|
| 2830 |
|
| 2831 | us = usb_gstrings_attach(cdev, fsg_strings_array,
|
| 2832 | ARRAY_SIZE(fsg_strings));
|
| 2833 | if (IS_ERR(us))
|
| 2834 | return PTR_ERR(us);
|
| 2835 |
|
| 2836 | fsg_intf_desc.iInterface = us[FSG_STRING_INTERFACE].id;
|
| 2837 |
|
| 2838 | |
| 2839 | * Some peripheral controllers are known not to be able to
|
| 2840 | * halt bulk endpoints correctly. If one of them is present,
|
| 2841 | * disable stalls.
|
| 2842 |
|
| 2843 | common->can_stall = can_stall &&
|
| 2844 | gadget_is_stall_supported(common->gadget);
|
| 2845 |
|
| 2846 | return 0;
|
| 2847 | }
|
| 2848 | EXPORT_SYMBOL_GPL(fsg_common_set_cdev);
|
| 2849 |
|
| 2850 | static struct attribute *fsg_lun_dev_attrs[] = {
|
| 2851 | &dev_attr_ro.attr,
|
| 2852 | &dev_attr_file.attr,
|
| 2853 | &dev_attr_nofua.attr,
|
| 2854 | &dev_attr_forced_eject.attr,
|
| 2855 | NULL
|
| 2856 | };
|
| 2857 |
|
| 2858 | static umode_t fsg_lun_dev_is_visible(struct kobject *kobj,
|
| 2859 | struct attribute *attr, int idx)
|
| 2860 | {
|
| 2861 | struct device *dev = kobj_to_dev(kobj);
|
| 2862 | struct fsg_lun *lun = fsg_lun_from_dev(dev);
|
| 2863 |
|
| 2864 | if (attr == &dev_attr_ro.attr)
|
| 2865 | return lun->cdrom ? S_IRUGO : (S_IWUSR | S_IRUGO);
|
| 2866 | if (attr == &dev_attr_file.attr)
|
| 2867 | return lun->removable ? (S_IWUSR | S_IRUGO) : S_IRUGO;
|
| 2868 | return attr->mode;
|
| 2869 | }
|
| 2870 |
|
| 2871 | static const struct attribute_group fsg_lun_dev_group = {
|
| 2872 | .attrs = fsg_lun_dev_attrs,
|
| 2873 | .is_visible = fsg_lun_dev_is_visible,
|
| 2874 | };
|
| 2875 |
|
| 2876 | static const struct attribute_group *fsg_lun_dev_groups[] = {
|
| 2877 | &fsg_lun_dev_group,
|
| 2878 | NULL
|
| 2879 | };
|
| 2880 |
|
| 2881 | int fsg_common_create_lun(struct fsg_common *common, struct fsg_lun_config *cfg,
|
| 2882 | unsigned int id, const char *name,
|
| 2883 | const char **name_pfx)
|
| 2884 | {
|
| 2885 | struct fsg_lun *lun;
|
| 2886 | char *pathbuf = NULL, *p = "(no medium)";
|
| 2887 | int rc = -ENOMEM;
|
| 2888 |
|
| 2889 | if (id >= ARRAY_SIZE(common->luns))
|
| 2890 | return -ENODEV;
|
| 2891 |
|
| 2892 | if (common->luns[id])
|
| 2893 | return -EBUSY;
|
| 2894 |
|
| 2895 | if (!cfg->filename && !cfg->removable) {
|
| 2896 | pr_err("no file given for LUN%d\n", id);
|
| 2897 | return -EINVAL;
|
| 2898 | }
|
| 2899 |
|
| 2900 | lun = kzalloc_obj(*lun);
|
| 2901 | if (!lun)
|
| 2902 | return -ENOMEM;
|
| 2903 |
|
| 2904 | lun->name_pfx = name_pfx;
|
| 2905 |
|
| 2906 | lun->cdrom = !!cfg->cdrom;
|
| 2907 | lun->ro = cfg->cdrom || cfg->ro;
|
| 2908 | lun->initially_ro = lun->ro;
|
| 2909 | lun->removable = !!cfg->removable;
|
| 2910 |
|
| 2911 | if (!common->sysfs) {
|
| 2912 |
|
| 2913 | lun->name = name;
|
| 2914 | } else {
|
| 2915 | lun->dev.release = fsg_lun_release;
|
| 2916 | lun->dev.parent = &common->gadget->dev;
|
| 2917 | lun->dev.groups = fsg_lun_dev_groups;
|
| 2918 | dev_set_drvdata(&lun->dev, &common->filesem);
|
| 2919 | dev_set_name(&lun->dev, "%s", name);
|
| 2920 | lun->name = dev_name(&lun->dev);
|
| 2921 |
|
| 2922 | rc = device_register(&lun->dev);
|
| 2923 | if (rc) {
|
| 2924 | pr_info("failed to register LUN%d: %d\n", id, rc);
|
| 2925 | put_device(&lun->dev);
|
| 2926 | goto error_sysfs;
|
| 2927 | }
|
| 2928 | }
|
| 2929 |
|
| 2930 | common->luns[id] = lun;
|
| 2931 |
|
| 2932 | if (cfg->filename) {
|
| 2933 | rc = fsg_lun_open(lun, cfg->filename);
|
| 2934 | if (rc)
|
| 2935 | goto error_lun;
|
| 2936 |
|
| 2937 | p = "(error)";
|
| 2938 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
|
| 2939 | if (pathbuf) {
|
| 2940 | p = file_path(lun->filp, pathbuf, PATH_MAX);
|
| 2941 | if (IS_ERR(p))
|
| 2942 | p = "(error)";
|
| 2943 | }
|
| 2944 | }
|
| 2945 | pr_info("LUN: %s%s%sfile: %s\n",
|
| 2946 | lun->removable ? "removable " : "",
|
| 2947 | lun->ro ? "read only " : "",
|
| 2948 | lun->cdrom ? "CD-ROM " : "",
|
| 2949 | p);
|
| 2950 | kfree(pathbuf);
|
| 2951 |
|
| 2952 | return 0;
|
| 2953 |
|
| 2954 | error_lun:
|
| 2955 | if (device_is_registered(&lun->dev))
|
| 2956 | device_unregister(&lun->dev);
|
| 2957 | common->luns[id] = NULL;
|
| 2958 | error_sysfs:
|
| 2959 | kfree(lun);
|
| 2960 | return rc;
|
| 2961 | }
|
| 2962 | EXPORT_SYMBOL_GPL(fsg_common_create_lun);
|
| 2963 |
|
| 2964 | int fsg_common_create_luns(struct fsg_common *common, struct fsg_config *cfg)
|
| 2965 | {
|
| 2966 | char buf[14];
|
| 2967 | int i, rc;
|
| 2968 |
|
| 2969 | fsg_common_remove_luns(common);
|
| 2970 |
|
| 2971 | for (i = 0; i < cfg->nluns; ++i) {
|
| 2972 | snprintf(buf, sizeof(buf), "lun%d", i);
|
| 2973 | rc = fsg_common_create_lun(common, &cfg->luns[i], i, buf, NULL);
|
| 2974 | if (rc)
|
| 2975 | goto fail;
|
| 2976 | }
|
| 2977 |
|
| 2978 | pr_info("Number of LUNs=%d\n", cfg->nluns);
|
| 2979 |
|
| 2980 | return 0;
|
| 2981 |
|
| 2982 | fail:
|
| 2983 | _fsg_common_remove_luns(common, i);
|
| 2984 | return rc;
|
| 2985 | }
|
| 2986 | EXPORT_SYMBOL_GPL(fsg_common_create_luns);
|
| 2987 |
|
| 2988 | void fsg_common_set_inquiry_string(struct fsg_common *common, const char *vn,
|
| 2989 | const char *pn)
|
| 2990 | {
|
| 2991 | int i;
|
| 2992 |
|
| 2993 |
|
| 2994 | i = get_default_bcdDevice();
|
| 2995 | snprintf(common->inquiry_string, sizeof(common->inquiry_string),
|
| 2996 | "%-8s%-16s%04x", vn ?: "Linux",
|
| 2997 |
|
| 2998 | pn ?: ((*common->luns)->cdrom
|
| 2999 | ? "File-CD Gadget"
|
| 3000 | : "File-Stor Gadget"),
|
| 3001 | i);
|
| 3002 | }
|
| 3003 | EXPORT_SYMBOL_GPL(fsg_common_set_inquiry_string);
|
| 3004 |
|
| 3005 | static void fsg_common_release(struct fsg_common *common)
|
| 3006 | {
|
| 3007 | int i;
|
| 3008 |
|
| 3009 |
|
| 3010 | if (common->state != FSG_STATE_TERMINATED) {
|
| 3011 | raise_exception(common, FSG_STATE_EXIT);
|
| 3012 | wait_for_completion(&common->thread_notifier);
|
| 3013 | }
|
| 3014 |
|
| 3015 | for (i = 0; i < ARRAY_SIZE(common->luns); ++i) {
|
| 3016 | struct fsg_lun *lun = common->luns[i];
|
| 3017 | if (!lun)
|
| 3018 | continue;
|
| 3019 | fsg_lun_close(lun);
|
| 3020 | if (device_is_registered(&lun->dev))
|
| 3021 | device_unregister(&lun->dev);
|
| 3022 | kfree(lun);
|
| 3023 | }
|
| 3024 |
|
| 3025 | _fsg_common_free_buffers(common->buffhds, common->fsg_num_buffers);
|
| 3026 | if (common->free_storage_on_release)
|
| 3027 | kfree(common);
|
| 3028 | }
|
| 3029 |
|
| 3030 |
|
| 3031 |
|
| 3032 |
|
| 3033 | static int fsg_bind(struct usb_configuration *c, struct usb_function *f)
|
| 3034 | {
|
| 3035 | struct fsg_dev *fsg = fsg_from_func(f);
|
| 3036 | struct fsg_common *common = fsg->common;
|
| 3037 | struct usb_gadget *gadget = c->cdev->gadget;
|
| 3038 | int i;
|
| 3039 | struct usb_ep *ep;
|
| 3040 | unsigned max_burst;
|
| 3041 | int ret;
|
| 3042 | struct fsg_opts *opts;
|
| 3043 |
|
| 3044 |
|
| 3045 | ret = _fsg_common_get_max_lun(common);
|
| 3046 | if (ret < 0) {
|
| 3047 | pr_err("There should be at least one LUN.\n");
|
| 3048 | return -EINVAL;
|
| 3049 | }
|
| 3050 |
|
| 3051 | opts = fsg_opts_from_func_inst(f->fi);
|
| 3052 | if (!opts->no_configfs) {
|
| 3053 | ret = fsg_common_set_cdev(fsg->common, c->cdev,
|
| 3054 | fsg->common->can_stall);
|
| 3055 | if (ret)
|
| 3056 | return ret;
|
| 3057 | fsg_common_set_inquiry_string(fsg->common, NULL, NULL);
|
| 3058 | }
|
| 3059 |
|
| 3060 | if (!common->thread_task) {
|
| 3061 | common->state = FSG_STATE_NORMAL;
|
| 3062 | common->thread_task =
|
| 3063 | kthread_run(fsg_main_thread, common, "file-storage");
|
| 3064 | if (IS_ERR(common->thread_task)) {
|
| 3065 | ret = PTR_ERR(common->thread_task);
|
| 3066 | common->thread_task = NULL;
|
| 3067 | common->state = FSG_STATE_TERMINATED;
|
| 3068 | return ret;
|
| 3069 | }
|
| 3070 | DBG(common, "I/O thread pid: %d\n",
|
| 3071 | task_pid_nr(common->thread_task));
|
| 3072 | }
|
| 3073 |
|
| 3074 | fsg->gadget = gadget;
|
| 3075 |
|
| 3076 |
|
| 3077 | i = usb_interface_id(c, f);
|
| 3078 | if (i < 0)
|
| 3079 | goto fail;
|
| 3080 | fsg_intf_desc.bInterfaceNumber = i;
|
| 3081 | fsg->interface_number = i;
|
| 3082 |
|
| 3083 |
|
| 3084 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_in_desc);
|
| 3085 | if (!ep)
|
| 3086 | goto autoconf_fail;
|
| 3087 | fsg->bulk_in = ep;
|
| 3088 |
|
| 3089 | ep = usb_ep_autoconfig(gadget, &fsg_fs_bulk_out_desc);
|
| 3090 | if (!ep)
|
| 3091 | goto autoconf_fail;
|
| 3092 | fsg->bulk_out = ep;
|
| 3093 |
|
| 3094 |
|
| 3095 | fsg_hs_bulk_in_desc.bEndpointAddress =
|
| 3096 | fsg_fs_bulk_in_desc.bEndpointAddress;
|
| 3097 | fsg_hs_bulk_out_desc.bEndpointAddress =
|
| 3098 | fsg_fs_bulk_out_desc.bEndpointAddress;
|
| 3099 |
|
| 3100 |
|
| 3101 | max_burst = min_t(unsigned, FSG_BUFLEN / 1024, 15);
|
| 3102 |
|
| 3103 | fsg_ss_bulk_in_desc.bEndpointAddress =
|
| 3104 | fsg_fs_bulk_in_desc.bEndpointAddress;
|
| 3105 | fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst;
|
| 3106 |
|
| 3107 | fsg_ss_bulk_out_desc.bEndpointAddress =
|
| 3108 | fsg_fs_bulk_out_desc.bEndpointAddress;
|
| 3109 | fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst;
|
| 3110 |
|
| 3111 | ret = usb_assign_descriptors(f, fsg_fs_function, fsg_hs_function,
|
| 3112 | fsg_ss_function, fsg_ss_function);
|
| 3113 | if (ret)
|
| 3114 | goto autoconf_fail;
|
| 3115 |
|
| 3116 | return 0;
|
| 3117 |
|
| 3118 | autoconf_fail:
|
| 3119 | ERROR(fsg, "unable to autoconfigure all endpoints\n");
|
| 3120 | i = -ENOTSUPP;
|
| 3121 | fail:
|
| 3122 |
|
| 3123 | if (fsg->common->state != FSG_STATE_TERMINATED) {
|
| 3124 | raise_exception(fsg->common, FSG_STATE_EXIT);
|
| 3125 | wait_for_completion(&fsg->common->thread_notifier);
|
| 3126 | }
|
| 3127 | return i;
|
| 3128 | }
|
| 3129 |
|
| 3130 |
|
| 3131 |
|
| 3132 | static void fsg_unbind(struct usb_configuration *c, struct usb_function *f)
|
| 3133 | {
|
| 3134 | struct fsg_dev *fsg = fsg_from_func(f);
|
| 3135 | struct fsg_common *common = fsg->common;
|
| 3136 |
|
| 3137 | DBG(fsg, "unbind\n");
|
| 3138 | if (fsg->common->fsg == fsg) {
|
| 3139 | __raise_exception(fsg->common, FSG_STATE_CONFIG_CHANGE, NULL);
|
| 3140 |
|
| 3141 | wait_event(common->fsg_wait, common->fsg != fsg);
|
| 3142 | }
|
| 3143 |
|
| 3144 | usb_free_all_descriptors(&fsg->function);
|
| 3145 | }
|
| 3146 |
|
| 3147 | static inline struct fsg_lun_opts *to_fsg_lun_opts(struct config_item *item)
|
| 3148 | {
|
| 3149 | return container_of(to_config_group(item), struct fsg_lun_opts, group);
|
| 3150 | }
|
| 3151 |
|
| 3152 | static inline struct fsg_opts *to_fsg_opts(struct config_item *item)
|
| 3153 | {
|
| 3154 | return container_of(to_config_group(item), struct fsg_opts,
|
| 3155 | func_inst.group);
|
| 3156 | }
|
| 3157 |
|
| 3158 | static void fsg_lun_attr_release(struct config_item *item)
|
| 3159 | {
|
| 3160 | struct fsg_lun_opts *lun_opts;
|
| 3161 |
|
| 3162 | lun_opts = to_fsg_lun_opts(item);
|
| 3163 | kfree(lun_opts);
|
| 3164 | }
|
| 3165 |
|
| 3166 | static const struct configfs_item_operations fsg_lun_item_ops = {
|
| 3167 | .release = fsg_lun_attr_release,
|
| 3168 | };
|
| 3169 |
|
| 3170 | static ssize_t fsg_lun_opts_file_show(struct config_item *item, char *page)
|
| 3171 | {
|
| 3172 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
|
| 3173 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
|
| 3174 |
|
| 3175 | return fsg_show_file(opts->lun, &fsg_opts->common->filesem, page);
|
| 3176 | }
|
| 3177 |
|
| 3178 | static ssize_t fsg_lun_opts_file_store(struct config_item *item,
|
| 3179 | const char *page, size_t len)
|
| 3180 | {
|
| 3181 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
|
| 3182 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
|
| 3183 |
|
| 3184 | return fsg_store_file(opts->lun, &fsg_opts->common->filesem, page, len);
|
| 3185 | }
|
| 3186 |
|
| 3187 | CONFIGFS_ATTR(fsg_lun_opts_, file);
|
| 3188 |
|
| 3189 | static ssize_t fsg_lun_opts_ro_show(struct config_item *item, char *page)
|
| 3190 | {
|
| 3191 | return fsg_show_ro(to_fsg_lun_opts(item)->lun, page);
|
| 3192 | }
|
| 3193 |
|
| 3194 | static ssize_t fsg_lun_opts_ro_store(struct config_item *item,
|
| 3195 | const char *page, size_t len)
|
| 3196 | {
|
| 3197 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
|
| 3198 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
|
| 3199 |
|
| 3200 | return fsg_store_ro(opts->lun, &fsg_opts->common->filesem, page, len);
|
| 3201 | }
|
| 3202 |
|
| 3203 | CONFIGFS_ATTR(fsg_lun_opts_, ro);
|
| 3204 |
|
| 3205 | static ssize_t fsg_lun_opts_removable_show(struct config_item *item,
|
| 3206 | char *page)
|
| 3207 | {
|
| 3208 | return fsg_show_removable(to_fsg_lun_opts(item)->lun, page);
|
| 3209 | }
|
| 3210 |
|
| 3211 | static ssize_t fsg_lun_opts_removable_store(struct config_item *item,
|
| 3212 | const char *page, size_t len)
|
| 3213 | {
|
| 3214 | return fsg_store_removable(to_fsg_lun_opts(item)->lun, page, len);
|
| 3215 | }
|
| 3216 |
|
| 3217 | CONFIGFS_ATTR(fsg_lun_opts_, removable);
|
| 3218 |
|
| 3219 | static ssize_t fsg_lun_opts_cdrom_show(struct config_item *item, char *page)
|
| 3220 | {
|
| 3221 | return fsg_show_cdrom(to_fsg_lun_opts(item)->lun, page);
|
| 3222 | }
|
| 3223 |
|
| 3224 | static ssize_t fsg_lun_opts_cdrom_store(struct config_item *item,
|
| 3225 | const char *page, size_t len)
|
| 3226 | {
|
| 3227 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
|
| 3228 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
|
| 3229 |
|
| 3230 | return fsg_store_cdrom(opts->lun, &fsg_opts->common->filesem, page,
|
| 3231 | len);
|
| 3232 | }
|
| 3233 |
|
| 3234 | CONFIGFS_ATTR(fsg_lun_opts_, cdrom);
|
| 3235 |
|
| 3236 | static ssize_t fsg_lun_opts_nofua_show(struct config_item *item, char *page)
|
| 3237 | {
|
| 3238 | return fsg_show_nofua(to_fsg_lun_opts(item)->lun, page);
|
| 3239 | }
|
| 3240 |
|
| 3241 | static ssize_t fsg_lun_opts_nofua_store(struct config_item *item,
|
| 3242 | const char *page, size_t len)
|
| 3243 | {
|
| 3244 | return fsg_store_nofua(to_fsg_lun_opts(item)->lun, page, len);
|
| 3245 | }
|
| 3246 |
|
| 3247 | CONFIGFS_ATTR(fsg_lun_opts_, nofua);
|
| 3248 |
|
| 3249 | static ssize_t fsg_lun_opts_inquiry_string_show(struct config_item *item,
|
| 3250 | char *page)
|
| 3251 | {
|
| 3252 | return fsg_show_inquiry_string(to_fsg_lun_opts(item)->lun, page);
|
| 3253 | }
|
| 3254 |
|
| 3255 | static ssize_t fsg_lun_opts_inquiry_string_store(struct config_item *item,
|
| 3256 | const char *page, size_t len)
|
| 3257 | {
|
| 3258 | return fsg_store_inquiry_string(to_fsg_lun_opts(item)->lun, page, len);
|
| 3259 | }
|
| 3260 |
|
| 3261 | CONFIGFS_ATTR(fsg_lun_opts_, inquiry_string);
|
| 3262 |
|
| 3263 | static ssize_t fsg_lun_opts_forced_eject_store(struct config_item *item,
|
| 3264 | const char *page, size_t len)
|
| 3265 | {
|
| 3266 | struct fsg_lun_opts *opts = to_fsg_lun_opts(item);
|
| 3267 | struct fsg_opts *fsg_opts = to_fsg_opts(opts->group.cg_item.ci_parent);
|
| 3268 |
|
| 3269 | return fsg_store_forced_eject(opts->lun, &fsg_opts->common->filesem,
|
| 3270 | page, len);
|
| 3271 | }
|
| 3272 |
|
| 3273 | CONFIGFS_ATTR_WO(fsg_lun_opts_, forced_eject);
|
| 3274 |
|
| 3275 | static struct configfs_attribute *fsg_lun_attrs[] = {
|
| 3276 | &fsg_lun_opts_attr_file,
|
| 3277 | &fsg_lun_opts_attr_ro,
|
| 3278 | &fsg_lun_opts_attr_removable,
|
| 3279 | &fsg_lun_opts_attr_cdrom,
|
| 3280 | &fsg_lun_opts_attr_nofua,
|
| 3281 | &fsg_lun_opts_attr_inquiry_string,
|
| 3282 | &fsg_lun_opts_attr_forced_eject,
|
| 3283 | NULL,
|
| 3284 | };
|
| 3285 |
|
| 3286 | static const struct config_item_type fsg_lun_type = {
|
| 3287 | .ct_item_ops = &fsg_lun_item_ops,
|
| 3288 | .ct_attrs = fsg_lun_attrs,
|
| 3289 | .ct_owner = THIS_MODULE,
|
| 3290 | };
|
| 3291 |
|
| 3292 | static struct config_group *fsg_lun_make(struct config_group *group,
|
| 3293 | const char *name)
|
| 3294 | {
|
| 3295 | struct fsg_lun_opts *opts;
|
| 3296 | struct fsg_opts *fsg_opts;
|
| 3297 | struct fsg_lun_config config;
|
| 3298 | char *num_str;
|
| 3299 | u8 num;
|
| 3300 | int ret;
|
| 3301 |
|
| 3302 | num_str = strchr(name, '.');
|
| 3303 | if (!num_str) {
|
| 3304 | pr_err("Unable to locate . in LUN.NUMBER\n");
|
| 3305 | return ERR_PTR(-EINVAL);
|
| 3306 | }
|
| 3307 | num_str++;
|
| 3308 |
|
| 3309 | ret = kstrtou8(num_str, 0, &num);
|
| 3310 | if (ret)
|
| 3311 | return ERR_PTR(ret);
|
| 3312 |
|
| 3313 | fsg_opts = to_fsg_opts(&group->cg_item);
|
| 3314 | if (num >= FSG_MAX_LUNS)
|
| 3315 | return ERR_PTR(-ERANGE);
|
| 3316 | num = array_index_nospec(num, FSG_MAX_LUNS);
|
| 3317 |
|
| 3318 | mutex_lock(&fsg_opts->lock);
|
| 3319 | if (fsg_opts->refcnt || fsg_opts->common->luns[num]) {
|
| 3320 | ret = -EBUSY;
|
| 3321 | goto out;
|
| 3322 | }
|
| 3323 |
|
| 3324 | opts = kzalloc_obj(*opts);
|
| 3325 | if (!opts) {
|
| 3326 | ret = -ENOMEM;
|
| 3327 | goto out;
|
| 3328 | }
|
| 3329 |
|
| 3330 | memset(&config, 0, sizeof(config));
|
| 3331 | config.removable = true;
|
| 3332 |
|
| 3333 | ret = fsg_common_create_lun(fsg_opts->common, &config, num, name,
|
| 3334 | (const char **)&group->cg_item.ci_name);
|
| 3335 | if (ret) {
|
| 3336 | kfree(opts);
|
| 3337 | goto out;
|
| 3338 | }
|
| 3339 | opts->lun = fsg_opts->common->luns[num];
|
| 3340 | opts->lun_id = num;
|
| 3341 | mutex_unlock(&fsg_opts->lock);
|
| 3342 |
|
| 3343 | config_group_init_type_name(&opts->group, name, &fsg_lun_type);
|
| 3344 |
|
| 3345 | return &opts->group;
|
| 3346 | out:
|
| 3347 | mutex_unlock(&fsg_opts->lock);
|
| 3348 | return ERR_PTR(ret);
|
| 3349 | }
|
| 3350 |
|
| 3351 | static void fsg_lun_drop(struct config_group *group, struct config_item *item)
|
| 3352 | {
|
| 3353 | struct fsg_lun_opts *lun_opts;
|
| 3354 | struct fsg_opts *fsg_opts;
|
| 3355 |
|
| 3356 | lun_opts = to_fsg_lun_opts(item);
|
| 3357 | fsg_opts = to_fsg_opts(&group->cg_item);
|
| 3358 |
|
| 3359 | mutex_lock(&fsg_opts->lock);
|
| 3360 | if (fsg_opts->refcnt) {
|
| 3361 | struct config_item *gadget;
|
| 3362 |
|
| 3363 | gadget = group->cg_item.ci_parent->ci_parent;
|
| 3364 | unregister_gadget_item(gadget);
|
| 3365 | }
|
| 3366 |
|
| 3367 | fsg_common_remove_lun(lun_opts->lun);
|
| 3368 | fsg_opts->common->luns[lun_opts->lun_id] = NULL;
|
| 3369 | lun_opts->lun_id = 0;
|
| 3370 | mutex_unlock(&fsg_opts->lock);
|
| 3371 |
|
| 3372 | config_item_put(item);
|
| 3373 | }
|
| 3374 |
|
| 3375 | static void fsg_attr_release(struct config_item *item)
|
| 3376 | {
|
| 3377 | struct fsg_opts *opts = to_fsg_opts(item);
|
| 3378 |
|
| 3379 | usb_put_function_instance(&opts->func_inst);
|
| 3380 | }
|
| 3381 |
|
| 3382 | static const struct configfs_item_operations fsg_item_ops = {
|
| 3383 | .release = fsg_attr_release,
|
| 3384 | };
|
| 3385 |
|
| 3386 | static ssize_t fsg_opts_stall_show(struct config_item *item, char *page)
|
| 3387 | {
|
| 3388 | struct fsg_opts *opts = to_fsg_opts(item);
|
| 3389 | int result;
|
| 3390 |
|
| 3391 | mutex_lock(&opts->lock);
|
| 3392 | result = sprintf(page, "%d", opts->common->can_stall);
|
| 3393 | mutex_unlock(&opts->lock);
|
| 3394 |
|
| 3395 | return result;
|
| 3396 | }
|
| 3397 |
|
| 3398 | static ssize_t fsg_opts_stall_store(struct config_item *item, const char *page,
|
| 3399 | size_t len)
|
| 3400 | {
|
| 3401 | struct fsg_opts *opts = to_fsg_opts(item);
|
| 3402 | int ret;
|
| 3403 | bool stall;
|
| 3404 |
|
| 3405 | mutex_lock(&opts->lock);
|
| 3406 |
|
| 3407 | if (opts->refcnt) {
|
| 3408 | mutex_unlock(&opts->lock);
|
| 3409 | return -EBUSY;
|
| 3410 | }
|
| 3411 |
|
| 3412 | ret = kstrtobool(page, &stall);
|
| 3413 | if (!ret) {
|
| 3414 | opts->common->can_stall = stall;
|
| 3415 | ret = len;
|
| 3416 | }
|
| 3417 |
|
| 3418 | mutex_unlock(&opts->lock);
|
| 3419 |
|
| 3420 | return ret;
|
| 3421 | }
|
| 3422 |
|
| 3423 | CONFIGFS_ATTR(fsg_opts_, stall);
|
| 3424 |
|
| 3425 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES
|
| 3426 | static ssize_t fsg_opts_num_buffers_show(struct config_item *item, char *page)
|
| 3427 | {
|
| 3428 | struct fsg_opts *opts = to_fsg_opts(item);
|
| 3429 | int result;
|
| 3430 |
|
| 3431 | mutex_lock(&opts->lock);
|
| 3432 | result = sprintf(page, "%d", opts->common->fsg_num_buffers);
|
| 3433 | mutex_unlock(&opts->lock);
|
| 3434 |
|
| 3435 | return result;
|
| 3436 | }
|
| 3437 |
|
| 3438 | static ssize_t fsg_opts_num_buffers_store(struct config_item *item,
|
| 3439 | const char *page, size_t len)
|
| 3440 | {
|
| 3441 | struct fsg_opts *opts = to_fsg_opts(item);
|
| 3442 | int ret;
|
| 3443 | u8 num;
|
| 3444 |
|
| 3445 | mutex_lock(&opts->lock);
|
| 3446 | if (opts->refcnt) {
|
| 3447 | ret = -EBUSY;
|
| 3448 | goto end;
|
| 3449 | }
|
| 3450 | ret = kstrtou8(page, 0, &num);
|
| 3451 | if (ret)
|
| 3452 | goto end;
|
| 3453 |
|
| 3454 | ret = fsg_common_set_num_buffers(opts->common, num);
|
| 3455 | if (ret)
|
| 3456 | goto end;
|
| 3457 | ret = len;
|
| 3458 |
|
| 3459 | end:
|
| 3460 | mutex_unlock(&opts->lock);
|
| 3461 | return ret;
|
| 3462 | }
|
| 3463 |
|
| 3464 | CONFIGFS_ATTR(fsg_opts_, num_buffers);
|
| 3465 | #endif
|
| 3466 |
|
| 3467 | static struct configfs_attribute *fsg_attrs[] = {
|
| 3468 | &fsg_opts_attr_stall,
|
| 3469 | #ifdef CONFIG_USB_GADGET_DEBUG_FILES
|
| 3470 | &fsg_opts_attr_num_buffers,
|
| 3471 | #endif
|
| 3472 | NULL,
|
| 3473 | };
|
| 3474 |
|
| 3475 | static const struct configfs_group_operations fsg_group_ops = {
|
| 3476 | .make_group = fsg_lun_make,
|
| 3477 | .drop_item = fsg_lun_drop,
|
| 3478 | };
|
| 3479 |
|
| 3480 | static const struct config_item_type fsg_func_type = {
|
| 3481 | .ct_item_ops = &fsg_item_ops,
|
| 3482 | .ct_group_ops = &fsg_group_ops,
|
| 3483 | .ct_attrs = fsg_attrs,
|
| 3484 | .ct_owner = THIS_MODULE,
|
| 3485 | };
|
| 3486 |
|
| 3487 | static void fsg_free_inst(struct usb_function_instance *fi)
|
| 3488 | {
|
| 3489 | struct fsg_opts *opts;
|
| 3490 |
|
| 3491 | opts = fsg_opts_from_func_inst(fi);
|
| 3492 | fsg_common_release(opts->common);
|
| 3493 | kfree(opts);
|
| 3494 | }
|
| 3495 |
|
| 3496 | static struct usb_function_instance *fsg_alloc_inst(void)
|
| 3497 | {
|
| 3498 | struct fsg_opts *opts;
|
| 3499 | struct fsg_lun_config config;
|
| 3500 | int rc;
|
| 3501 |
|
| 3502 | opts = kzalloc_obj(*opts);
|
| 3503 | if (!opts)
|
| 3504 | return ERR_PTR(-ENOMEM);
|
| 3505 | mutex_init(&opts->lock);
|
| 3506 | opts->func_inst.free_func_inst = fsg_free_inst;
|
| 3507 | opts->common = fsg_common_setup(opts->common);
|
| 3508 | if (IS_ERR(opts->common)) {
|
| 3509 | rc = PTR_ERR(opts->common);
|
| 3510 | goto release_opts;
|
| 3511 | }
|
| 3512 |
|
| 3513 | rc = fsg_common_set_num_buffers(opts->common,
|
| 3514 | CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS);
|
| 3515 | if (rc)
|
| 3516 | goto release_common;
|
| 3517 |
|
| 3518 | memset(&config, 0, sizeof(config));
|
| 3519 | config.removable = true;
|
| 3520 | rc = fsg_common_create_lun(opts->common, &config, 0, "lun.0",
|
| 3521 | (const char **)&opts->func_inst.group.cg_item.ci_name);
|
| 3522 | if (rc)
|
| 3523 | goto release_buffers;
|
| 3524 |
|
| 3525 | opts->lun0.lun = opts->common->luns[0];
|
| 3526 | opts->lun0.lun_id = 0;
|
| 3527 |
|
| 3528 | config_group_init_type_name(&opts->func_inst.group, "", &fsg_func_type);
|
| 3529 |
|
| 3530 | config_group_init_type_name(&opts->lun0.group, "lun.0", &fsg_lun_type);
|
| 3531 | configfs_add_default_group(&opts->lun0.group, &opts->func_inst.group);
|
| 3532 |
|
| 3533 | return &opts->func_inst;
|
| 3534 |
|
| 3535 | release_buffers:
|
| 3536 | fsg_common_free_buffers(opts->common);
|
| 3537 | release_common:
|
| 3538 | kfree(opts->common);
|
| 3539 | release_opts:
|
| 3540 | kfree(opts);
|
| 3541 | return ERR_PTR(rc);
|
| 3542 | }
|
| 3543 |
|
| 3544 | static void fsg_free(struct usb_function *f)
|
| 3545 | {
|
| 3546 | struct fsg_dev *fsg;
|
| 3547 | struct fsg_opts *opts;
|
| 3548 |
|
| 3549 | fsg = container_of(f, struct fsg_dev, function);
|
| 3550 | opts = container_of(f->fi, struct fsg_opts, func_inst);
|
| 3551 |
|
| 3552 | mutex_lock(&opts->lock);
|
| 3553 | opts->refcnt--;
|
| 3554 | mutex_unlock(&opts->lock);
|
| 3555 |
|
| 3556 | kfree(fsg);
|
| 3557 | }
|
| 3558 |
|
| 3559 | static struct usb_function *fsg_alloc(struct usb_function_instance *fi)
|
| 3560 | {
|
| 3561 | struct fsg_opts *opts = fsg_opts_from_func_inst(fi);
|
| 3562 | struct fsg_common *common = opts->common;
|
| 3563 | struct fsg_dev *fsg;
|
| 3564 |
|
| 3565 | fsg = kzalloc_obj(*fsg);
|
| 3566 | if (unlikely(!fsg))
|
| 3567 | return ERR_PTR(-ENOMEM);
|
| 3568 |
|
| 3569 | mutex_lock(&opts->lock);
|
| 3570 | opts->refcnt++;
|
| 3571 | mutex_unlock(&opts->lock);
|
| 3572 |
|
| 3573 | fsg->function.name = FSG_DRIVER_DESC;
|
| 3574 | fsg->function.bind = fsg_bind;
|
| 3575 | fsg->function.unbind = fsg_unbind;
|
| 3576 | fsg->function.setup = fsg_setup;
|
| 3577 | fsg->function.set_alt = fsg_set_alt;
|
| 3578 | fsg->function.disable = fsg_disable;
|
| 3579 | fsg->function.free_func = fsg_free;
|
| 3580 |
|
| 3581 | fsg->common = common;
|
| 3582 |
|
| 3583 | return &fsg->function;
|
| 3584 | }
|
| 3585 |
|
| 3586 | DECLARE_USB_FUNCTION_INIT(mass_storage, fsg_alloc_inst, fsg_alloc);
|
| 3587 | MODULE_DESCRIPTION("Mass Storage USB Composite Function");
|
| 3588 | MODULE_LICENSE("GPL");
|
| 3589 | MODULE_AUTHOR("Michal Nazarewicz");
|
| 3590 |
|
| 3591 |
|
| 3592 |
|
| 3593 |
|
| 3594 | void fsg_config_from_params(struct fsg_config *cfg,
|
| 3595 | const struct fsg_module_parameters *params,
|
| 3596 | unsigned int fsg_num_buffers)
|
| 3597 | {
|
| 3598 | struct fsg_lun_config *lun;
|
| 3599 | unsigned i;
|
| 3600 |
|
| 3601 |
|
| 3602 | cfg->nluns =
|
| 3603 | min(params->luns ?: (params->file_count ?: 1u),
|
| 3604 | (unsigned)FSG_MAX_LUNS);
|
| 3605 | for (i = 0, lun = cfg->luns; i < cfg->nluns; ++i, ++lun) {
|
| 3606 | lun->ro = !!params->ro[i];
|
| 3607 | lun->cdrom = !!params->cdrom[i];
|
| 3608 | lun->removable = !!params->removable[i];
|
| 3609 | lun->filename =
|
| 3610 | params->file_count > i && params->file[i][0]
|
| 3611 | ? params->file[i]
|
| 3612 | : NULL;
|
| 3613 | }
|
| 3614 |
|
| 3615 |
|
| 3616 | cfg->vendor_name = NULL;
|
| 3617 | cfg->product_name = NULL;
|
| 3618 |
|
| 3619 | cfg->ops = NULL;
|
| 3620 | cfg->private_data = NULL;
|
| 3621 |
|
| 3622 |
|
| 3623 | cfg->can_stall = params->stall;
|
| 3624 | cfg->fsg_num_buffers = fsg_num_buffers;
|
| 3625 | }
|
| 3626 | EXPORT_SYMBOL_GPL(fsg_config_from_params);
|