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62d104d0 MG |
1 | /* |
2 | * Driver for loading USB isight firmware | |
3 | * | |
4 | * Copyright (C) 2008 Matthew Garrett <mjg@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation, version 2. | |
9 | * | |
10 | * The USB isight cameras in recent Apples are roughly compatible with the USB | |
11 | * video class specification, and can be driven by uvcvideo. However, they | |
12 | * need firmware to be loaded beforehand. After firmware loading, the device | |
13 | * detaches from the USB bus and reattaches with a new device ID. It can then | |
14 | * be claimed by the uvc driver. | |
15 | * | |
16 | * The firmware is non-free and must be extracted by the user. Tools to do this | |
17 | * are available at http://bersace03.free.fr/ift/ | |
18 | * | |
19 | * The isight firmware loading was reverse engineered by Johannes Berg | |
20 | * <johannes@sipsolutions.de>, and this driver is based on code by Ronald | |
21 | * Bultje <rbultje@ronald.bitfreak.net> | |
22 | */ | |
23 | ||
24 | #include <linux/usb.h> | |
25 | #include <linux/firmware.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/module.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
62d104d0 | 29 | |
33b9e162 | 30 | static const struct usb_device_id id_table[] = { |
62d104d0 MG |
31 | {USB_DEVICE(0x05ac, 0x8300)}, |
32 | {}, | |
33 | }; | |
34 | ||
35 | MODULE_DEVICE_TABLE(usb, id_table); | |
36 | ||
37 | static int isight_firmware_load(struct usb_interface *intf, | |
38 | const struct usb_device_id *id) | |
39 | { | |
40 | struct usb_device *dev = interface_to_usbdev(intf); | |
41 | int llen, len, req, ret = 0; | |
42 | const struct firmware *firmware; | |
62b58848 | 43 | unsigned char *buf = kmalloc(50, GFP_KERNEL); |
62d104d0 | 44 | unsigned char data[4]; |
ed5a2825 | 45 | const u8 *ptr; |
62b58848 MG |
46 | |
47 | if (!buf) | |
48 | return -ENOMEM; | |
62d104d0 MG |
49 | |
50 | if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) { | |
51 | printk(KERN_ERR "Unable to load isight firmware\n"); | |
ff1a4a7b PW |
52 | ret = -ENODEV; |
53 | goto out; | |
62d104d0 MG |
54 | } |
55 | ||
56 | ptr = firmware->data; | |
57 | ||
59bf5cf9 | 58 | buf[0] = 0x01; |
62d104d0 | 59 | if (usb_control_msg |
59bf5cf9 | 60 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1, |
62d104d0 MG |
61 | 300) != 1) { |
62 | printk(KERN_ERR | |
63 | "Failed to initialise isight firmware loader\n"); | |
64 | ret = -ENODEV; | |
65 | goto out; | |
66 | } | |
67 | ||
62b58848 | 68 | while (ptr+4 <= firmware->data+firmware->size) { |
62d104d0 MG |
69 | memcpy(data, ptr, 4); |
70 | len = (data[0] << 8 | data[1]); | |
71 | req = (data[2] << 8 | data[3]); | |
72 | ptr += 4; | |
73 | ||
74 | if (len == 0x8001) | |
75 | break; /* success */ | |
76 | else if (len == 0) | |
77 | continue; | |
78 | ||
79 | for (; len > 0; req += 50) { | |
62b58848 | 80 | llen = min(len, 50); |
62d104d0 | 81 | len -= llen; |
62b58848 MG |
82 | if (ptr+llen > firmware->data+firmware->size) { |
83 | printk(KERN_ERR | |
84 | "Malformed isight firmware"); | |
85 | ret = -ENODEV; | |
86 | goto out; | |
87 | } | |
62d104d0 MG |
88 | memcpy(buf, ptr, llen); |
89 | ||
90 | ptr += llen; | |
91 | ||
92 | if (usb_control_msg | |
93 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0, | |
94 | buf, llen, 300) != llen) { | |
95 | printk(KERN_ERR | |
96 | "Failed to load isight firmware\n"); | |
62d104d0 MG |
97 | ret = -ENODEV; |
98 | goto out; | |
99 | } | |
100 | ||
62d104d0 MG |
101 | } |
102 | } | |
62b58848 | 103 | |
59bf5cf9 | 104 | buf[0] = 0x00; |
62d104d0 | 105 | if (usb_control_msg |
59bf5cf9 | 106 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1, |
62d104d0 MG |
107 | 300) != 1) { |
108 | printk(KERN_ERR "isight firmware loading completion failed\n"); | |
109 | ret = -ENODEV; | |
110 | } | |
62b58848 | 111 | |
62d104d0 | 112 | out: |
62b58848 | 113 | kfree(buf); |
62d104d0 MG |
114 | release_firmware(firmware); |
115 | return ret; | |
116 | } | |
117 | ||
4e0961d5 BH |
118 | MODULE_FIRMWARE("isight.fw"); |
119 | ||
62d104d0 MG |
120 | static void isight_firmware_disconnect(struct usb_interface *intf) |
121 | { | |
122 | } | |
123 | ||
124 | static struct usb_driver isight_firmware_driver = { | |
125 | .name = "isight_firmware", | |
126 | .probe = isight_firmware_load, | |
127 | .disconnect = isight_firmware_disconnect, | |
128 | .id_table = id_table, | |
129 | }; | |
130 | ||
65db4305 | 131 | module_usb_driver(isight_firmware_driver); |
62d104d0 MG |
132 | |
133 | MODULE_LICENSE("GPL"); | |
134 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); |