1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*
* Driver for loading USB isight firmware
*
* Copyright (C) 2008 Matthew Garrett <mjg@redhat.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, version 2.
*
* The USB isight cameras in recent Apples are roughly compatible with the USB
* video class specification, and can be driven by uvcvideo. However, they
* need firmware to be loaded beforehand. After firmware loading, the device
* detaches from the USB bus and reattaches with a new device ID. It can then
* be claimed by the uvc driver.
*
* The firmware is non-free and must be extracted by the user. Tools to do this
* are available at http://bersace03.free.fr/ift/
*
* The isight firmware loading was reverse engineered by Johannes Berg
* <johannes@sipsolutions.de>, and this driver is based on code by Ronald
* Bultje <rbultje@ronald.bitfreak.net>
*/
#include <linux/usb.h>
#include <linux/firmware.h>
#include <linux/errno.h>
#include <linux/module.h>
static const struct usb_device_id id_table[] = {
{USB_DEVICE(0x05ac, 0x8300)},
{},
};
MODULE_DEVICE_TABLE(usb, id_table);
static int isight_firmware_load(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
int llen, len, req, ret = 0;
const struct firmware *firmware;
unsigned char *buf = kmalloc(50, GFP_KERNEL);
unsigned char data[4];
const u8 *ptr;
if (!buf)
return -ENOMEM;
if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) {
printk(KERN_ERR "Unable to load isight firmware\n");
ret = -ENODEV;
goto out;
}
ptr = firmware->data;
if (usb_control_msg
(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\1", 1,
300) != 1) {
printk(KERN_ERR
"Failed to initialise isight firmware loader\n");
ret = -ENODEV;
goto out;
}
while (ptr+4 <= firmware->data+firmware->size) {
memcpy(data, ptr, 4);
len = (data[0] << 8 | data[1]);
req = (data[2] << 8 | data[3]);
ptr += 4;
if (len == 0x8001)
break; /* success */
else if (len == 0)
continue;
for (; len > 0; req += 50) {
llen = min(len, 50);
len -= llen;
if (ptr+llen > firmware->data+firmware->size) {
printk(KERN_ERR
"Malformed isight firmware");
ret = -ENODEV;
goto out;
}
memcpy(buf, ptr, llen);
ptr += llen;
if (usb_control_msg
(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0,
buf, llen, 300) != llen) {
printk(KERN_ERR
"Failed to load isight firmware\n");
ret = -ENODEV;
goto out;
}
}
}
if (usb_control_msg
(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\0", 1,
300) != 1) {
printk(KERN_ERR "isight firmware loading completion failed\n");
ret = -ENODEV;
}
out:
kfree(buf);
release_firmware(firmware);
return ret;
}
MODULE_FIRMWARE("isight.fw");
static void isight_firmware_disconnect(struct usb_interface *intf)
{
}
static struct usb_driver isight_firmware_driver = {
.name = "isight_firmware",
.probe = isight_firmware_load,
.disconnect = isight_firmware_disconnect,
.id_table = id_table,
};
static int __init isight_firmware_init(void)
{
return usb_register(&isight_firmware_driver);
}
static void __exit isight_firmware_exit(void)
{
usb_deregister(&isight_firmware_driver);
}
module_init(isight_firmware_init);
module_exit(isight_firmware_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
|
