62d104d0de
Uninitialised Apple iSight drivers present with a distinctive USB ID. Once firmware has been uploaded, they disconnect and reconnect with a new ID. At this point they can be driven by the uvcvideo driver. As this is unique to the Apple cameras and not functionality shared by any other UVC devices, it makes sense to provide the firmware loading functionality in a separate driver. This driver will read an isight.fw file extracted from the Apple driver using the tools at http://bersace03.free.fr/ift/ and upload it to the camera. It will also handle the case where the device loses its firmware during hibernation and must have it reloaded. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
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* Driver for loading USB isight firmware
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*
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* Copyright (C) 2008 Matthew Garrett <mjg@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation, version 2.
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*
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* The USB isight cameras in recent Apples are roughly compatible with the USB
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* video class specification, and can be driven by uvcvideo. However, they
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* need firmware to be loaded beforehand. After firmware loading, the device
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* detaches from the USB bus and reattaches with a new device ID. It can then
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* be claimed by the uvc driver.
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*
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* The firmware is non-free and must be extracted by the user. Tools to do this
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* are available at http://bersace03.free.fr/ift/
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*
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* The isight firmware loading was reverse engineered by Johannes Berg
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* <johannes@sipsolutions.de>, and this driver is based on code by Ronald
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* Bultje <rbultje@ronald.bitfreak.net>
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*/
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#include <linux/usb.h>
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#include <linux/firmware.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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static struct usb_device_id id_table[] = {
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{USB_DEVICE(0x05ac, 0x8300)},
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{},
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static int isight_firmware_load(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *dev = interface_to_usbdev(intf);
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int llen, len, req, ret = 0;
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const struct firmware *firmware;
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unsigned char *buf;
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unsigned char data[4];
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char *ptr;
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if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) {
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printk(KERN_ERR "Unable to load isight firmware\n");
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return -ENODEV;
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}
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ptr = firmware->data;
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\1", 1,
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300) != 1) {
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printk(KERN_ERR
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"Failed to initialise isight firmware loader\n");
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ret = -ENODEV;
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goto out;
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}
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while (1) {
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memcpy(data, ptr, 4);
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len = (data[0] << 8 | data[1]);
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req = (data[2] << 8 | data[3]);
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ptr += 4;
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if (len == 0x8001)
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break; /* success */
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else if (len == 0)
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continue;
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for (; len > 0; req += 50) {
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llen = len > 50 ? 50 : len;
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len -= llen;
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buf = kmalloc(llen, GFP_KERNEL);
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memcpy(buf, ptr, llen);
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ptr += llen;
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0,
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buf, llen, 300) != llen) {
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printk(KERN_ERR
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"Failed to load isight firmware\n");
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kfree(buf);
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ret = -ENODEV;
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goto out;
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}
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kfree(buf);
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}
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}
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\0", 1,
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300) != 1) {
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printk(KERN_ERR "isight firmware loading completion failed\n");
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ret = -ENODEV;
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}
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out:
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release_firmware(firmware);
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return ret;
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}
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static void isight_firmware_disconnect(struct usb_interface *intf)
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{
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}
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static struct usb_driver isight_firmware_driver = {
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.name = "isight_firmware",
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.probe = isight_firmware_load,
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.disconnect = isight_firmware_disconnect,
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.id_table = id_table,
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};
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static int __init isight_firmware_init(void)
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{
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return usb_register(&isight_firmware_driver);
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}
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static void __exit isight_firmware_exit(void)
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{
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usb_deregister(&isight_firmware_driver);
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}
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module_init(isight_firmware_init);
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module_exit(isight_firmware_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
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