| 1 | |
| 2 | |
| 3 | * USB Debug cable driver
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| 4 | *
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| 5 | * Copyright (C) 2006 Greg Kroah-Hartman <[email protected]>
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| 6 |
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| 7 |
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| 8 | #include <linux/gfp.h>
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| 9 | #include <linux/kernel.h>
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| 10 | #include <linux/tty.h>
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| 11 | #include <linux/module.h>
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| 12 | #include <linux/usb.h>
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| 13 | #include <linux/usb/serial.h>
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| 14 |
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| 15 | #define USB_DEBUG_MAX_PACKET_SIZE 8
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| 16 | #define USB_DEBUG_BRK_SIZE 8
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| 17 | static const char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
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| 18 | 0x00,
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| 19 | 0xff,
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| 20 | 0x01,
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| 21 | 0xfe,
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| 22 | 0x00,
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| 23 | 0xfe,
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| 24 | 0x01,
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| 25 | 0xff,
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| 26 | };
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| 27 |
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| 28 | static const struct usb_device_id id_table[] = {
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| 29 | { USB_DEVICE(0x0525, 0x127a) },
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| 30 | { },
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| 31 | };
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| 32 |
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| 33 | static const struct usb_device_id dbc_id_table[] = {
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| 34 | { USB_DEVICE(0x1d6b, 0x0010) },
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| 35 | { USB_DEVICE(0x1d6b, 0x0011) },
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| 36 | { },
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| 37 | };
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| 38 |
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| 39 | static const struct usb_device_id id_table_combined[] = {
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| 40 | { USB_DEVICE(0x0525, 0x127a) },
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| 41 | { USB_DEVICE(0x1d6b, 0x0010) },
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| 42 | { USB_DEVICE(0x1d6b, 0x0011) },
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| 43 | { },
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| 44 | };
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| 45 | MODULE_DEVICE_TABLE(usb, id_table_combined);
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| 46 |
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| 47 | |
| 48 | * emulated when ever the break state is set to true.
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| 49 |
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| 50 | static int usb_debug_break_ctl(struct tty_struct *tty, int break_state)
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| 51 | {
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| 52 | struct usb_serial_port *port = tty->driver_data;
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| 53 | int ret;
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| 54 |
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| 55 | if (!break_state)
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| 56 | return 0;
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| 57 |
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| 58 | ret = usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
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| 59 | if (ret < 0)
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| 60 | return ret;
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| 61 |
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| 62 | return 0;
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| 63 | }
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| 64 |
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| 65 | static void usb_debug_process_read_urb(struct urb *urb)
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| 66 | {
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| 67 | struct usb_serial_port *port = urb->context;
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| 68 |
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| 69 | if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
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| 70 | memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
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| 71 | USB_DEBUG_BRK_SIZE) == 0) {
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| 72 | usb_serial_handle_break(port);
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| 73 | return;
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| 74 | }
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| 75 |
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| 76 | usb_serial_generic_process_read_urb(urb);
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| 77 | }
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| 78 |
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| 79 | static void usb_debug_init_termios(struct tty_struct *tty)
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| 80 | {
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| 81 | tty->termios.c_lflag &= ~(ECHO | ECHONL);
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| 82 | }
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| 83 |
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| 84 | static struct usb_serial_driver debug_device = {
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| 85 | .driver = {
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| 86 | .name = "debug",
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| 87 | },
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| 88 | .id_table = id_table,
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| 89 | .num_ports = 1,
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| 90 | .bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE,
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| 91 | .break_ctl = usb_debug_break_ctl,
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| 92 | .init_termios = usb_debug_init_termios,
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| 93 | .process_read_urb = usb_debug_process_read_urb,
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| 94 | };
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| 95 |
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| 96 | static struct usb_serial_driver dbc_device = {
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| 97 | .driver = {
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| 98 | .name = "xhci_dbc",
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| 99 | },
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| 100 | .id_table = dbc_id_table,
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| 101 | .num_ports = 1,
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| 102 | .break_ctl = usb_debug_break_ctl,
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| 103 | .init_termios = usb_debug_init_termios,
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| 104 | .process_read_urb = usb_debug_process_read_urb,
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| 105 | };
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| 106 |
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| 107 | static struct usb_serial_driver * const serial_drivers[] = {
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| 108 | &debug_device, &dbc_device, NULL
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| 109 | };
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| 110 |
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| 111 | module_usb_serial_driver(serial_drivers, id_table_combined);
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| 112 | MODULE_DESCRIPTION("USB Debug cable driver");
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| 113 | MODULE_LICENSE("GPL v2");
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