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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 | ||
58 | if (usb_control_msg | |
59 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\1", 1, | |
60 | 300) != 1) { | |
61 | printk(KERN_ERR | |
62 | "Failed to initialise isight firmware loader\n"); | |
63 | ret = -ENODEV; | |
64 | goto out; | |
65 | } | |
66 | ||
62b58848 | 67 | while (ptr+4 <= firmware->data+firmware->size) { |
62d104d0 MG |
68 | memcpy(data, ptr, 4); |
69 | len = (data[0] << 8 | data[1]); | |
70 | req = (data[2] << 8 | data[3]); | |
71 | ptr += 4; | |
72 | ||
73 | if (len == 0x8001) | |
74 | break; /* success */ | |
75 | else if (len == 0) | |
76 | continue; | |
77 | ||
78 | for (; len > 0; req += 50) { | |
62b58848 | 79 | llen = min(len, 50); |
62d104d0 | 80 | len -= llen; |
62b58848 MG |
81 | if (ptr+llen > firmware->data+firmware->size) { |
82 | printk(KERN_ERR | |
83 | "Malformed isight firmware"); | |
84 | ret = -ENODEV; | |
85 | goto out; | |
86 | } | |
62d104d0 MG |
87 | memcpy(buf, ptr, llen); |
88 | ||
89 | ptr += llen; | |
90 | ||
91 | if (usb_control_msg | |
92 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0, | |
93 | buf, llen, 300) != llen) { | |
94 | printk(KERN_ERR | |
95 | "Failed to load isight firmware\n"); | |
62d104d0 MG |
96 | ret = -ENODEV; |
97 | goto out; | |
98 | } | |
99 | ||
62d104d0 MG |
100 | } |
101 | } | |
62b58848 | 102 | |
62d104d0 MG |
103 | if (usb_control_msg |
104 | (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\0", 1, | |
105 | 300) != 1) { | |
106 | printk(KERN_ERR "isight firmware loading completion failed\n"); | |
107 | ret = -ENODEV; | |
108 | } | |
62b58848 | 109 | |
62d104d0 | 110 | out: |
62b58848 | 111 | kfree(buf); |
62d104d0 MG |
112 | release_firmware(firmware); |
113 | return ret; | |
114 | } | |
115 | ||
4e0961d5 BH |
116 | MODULE_FIRMWARE("isight.fw"); |
117 | ||
62d104d0 MG |
118 | static void isight_firmware_disconnect(struct usb_interface *intf) |
119 | { | |
120 | } | |
121 | ||
122 | static struct usb_driver isight_firmware_driver = { | |
123 | .name = "isight_firmware", | |
124 | .probe = isight_firmware_load, | |
125 | .disconnect = isight_firmware_disconnect, | |
126 | .id_table = id_table, | |
127 | }; | |
128 | ||
129 | static int __init isight_firmware_init(void) | |
130 | { | |
131 | return usb_register(&isight_firmware_driver); | |
132 | } | |
133 | ||
134 | static void __exit isight_firmware_exit(void) | |
135 | { | |
136 | usb_deregister(&isight_firmware_driver); | |
137 | } | |
138 | ||
139 | module_init(isight_firmware_init); | |
140 | module_exit(isight_firmware_exit); | |
141 | ||
142 | MODULE_LICENSE("GPL"); | |
143 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); |