| 1 | |
| 2 | |
| 3 | * Driver for loading USB isight firmware
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| 4 | *
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| 5 | * Copyright (C) 2008 Matthew Garrett <[email protected]>
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| 6 | *
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| 7 | * The USB isight cameras in recent Apples are roughly compatible with the USB
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| 8 | * video class specification, and can be driven by uvcvideo. However, they
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| 9 | * need firmware to be loaded beforehand. After firmware loading, the device
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| 10 | * detaches from the USB bus and reattaches with a new device ID. It can then
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| 11 | * be claimed by the uvc driver.
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| 12 | *
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| 13 | * The firmware is non-free and must be extracted by the user. Tools to do this
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| 14 | * are available at http://bersace03.free.fr/ift/
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| 15 | *
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| 16 | * The isight firmware loading was reverse engineered by Johannes Berg
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| 17 | * <[email protected]>, and this driver is based on code by Ronald
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| 18 | * Bultje <[email protected]>
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| 19 |
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| 20 |
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| 21 | #include <linux/usb.h>
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| 22 | #include <linux/firmware.h>
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| 23 | #include <linux/errno.h>
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| 24 | #include <linux/module.h>
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| 25 | #include <linux/slab.h>
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| 26 |
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| 27 | static const struct usb_device_id id_table[] = {
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| 28 | {USB_DEVICE(0x05ac, 0x8300)},
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| 29 | {},
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| 30 | };
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| 31 |
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| 32 | MODULE_DEVICE_TABLE(usb, id_table);
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| 33 |
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| 34 | static int isight_firmware_load(struct usb_interface *intf,
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| 35 | const struct usb_device_id *id)
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| 36 | {
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| 37 | struct usb_device *dev = interface_to_usbdev(intf);
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| 38 | int llen, len, req, ret = 0;
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| 39 | const struct firmware *firmware;
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| 40 | unsigned char *buf = kmalloc(50, GFP_KERNEL);
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| 41 | unsigned char data[4];
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| 42 | const u8 *ptr;
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| 43 |
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| 44 | if (!buf)
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| 45 | return -ENOMEM;
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| 46 |
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| 47 | if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) {
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| 48 | printk(KERN_ERR "Unable to load isight firmware\n");
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| 49 | ret = -ENODEV;
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| 50 | goto out;
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| 51 | }
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| 52 |
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| 53 | ptr = firmware->data;
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| 54 |
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| 55 | buf[0] = 0x01;
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| 56 | if (usb_control_msg
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| 57 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1,
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| 58 | 300) != 1) {
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| 59 | printk(KERN_ERR
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| 60 | "Failed to initialise isight firmware loader\n");
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| 61 | ret = -ENODEV;
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| 62 | goto out;
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| 63 | }
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| 64 |
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| 65 | while (ptr+4 <= firmware->data+firmware->size) {
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| 66 | memcpy(data, ptr, 4);
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| 67 | len = (data[0] << 8 | data[1]);
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| 68 | req = (data[2] << 8 | data[3]);
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| 69 | ptr += 4;
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| 70 |
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| 71 | if (len == 0x8001)
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| 72 | break;
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| 73 | else if (len == 0)
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| 74 | continue;
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| 75 |
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| 76 | for (; len > 0; req += 50) {
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| 77 | llen = min(len, 50);
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| 78 | len -= llen;
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| 79 | if (ptr+llen > firmware->data+firmware->size) {
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| 80 | printk(KERN_ERR
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| 81 | "Malformed isight firmware");
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| 82 | ret = -ENODEV;
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| 83 | goto out;
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| 84 | }
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| 85 | memcpy(buf, ptr, llen);
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| 86 |
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| 87 | ptr += llen;
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| 88 |
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| 89 | if (usb_control_msg
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| 90 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0,
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| 91 | buf, llen, 300) != llen) {
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| 92 | printk(KERN_ERR
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| 93 | "Failed to load isight firmware\n");
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| 94 | ret = -ENODEV;
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| 95 | goto out;
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| 96 | }
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| 97 |
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| 98 | }
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| 99 | }
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| 100 |
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| 101 | buf[0] = 0x00;
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| 102 | if (usb_control_msg
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| 103 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1,
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| 104 | 300) != 1) {
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| 105 | printk(KERN_ERR "isight firmware loading completion failed\n");
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| 106 | ret = -ENODEV;
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| 107 | }
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| 108 |
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| 109 | out:
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| 110 | kfree(buf);
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| 111 | release_firmware(firmware);
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| 112 | return ret;
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| 113 | }
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| 114 |
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| 115 | MODULE_FIRMWARE("isight.fw");
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| 116 |
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| 117 | static void isight_firmware_disconnect(struct usb_interface *intf)
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| 118 | {
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| 119 | }
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| 120 |
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| 121 | static struct usb_driver isight_firmware_driver = {
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| 122 | .name = "isight_firmware",
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| 123 | .probe = isight_firmware_load,
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| 124 | .disconnect = isight_firmware_disconnect,
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| 125 | .id_table = id_table,
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| 126 | };
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| 127 |
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| 128 | module_usb_driver(isight_firmware_driver);
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| 129 |
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| 130 | MODULE_DESCRIPTION("iSight firmware loading support");
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| 131 | MODULE_LICENSE("GPL");
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| 132 | MODULE_AUTHOR("Matthew Garrett <[email protected]>");
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