132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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* 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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#include <linux/slab.h>
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static const 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 = kmalloc(50, GFP_KERNEL);
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unsigned char data[4];
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const u8 *ptr;
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if (!buf)
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return -ENOMEM;
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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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ret = -ENODEV;
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goto out;
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}
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ptr = firmware->data;
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buf[0] = 0x01;
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 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 (ptr+4 <= firmware->data+firmware->size) {
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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 = min(len, 50);
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len -= llen;
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if (ptr+llen > firmware->data+firmware->size) {
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printk(KERN_ERR
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"Malformed isight firmware");
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ret = -ENODEV;
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goto out;
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}
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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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ret = -ENODEV;
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goto out;
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}
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}
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}
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buf[0] = 0x00;
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if (usb_control_msg
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(dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 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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kfree(buf);
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release_firmware(firmware);
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return ret;
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}
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MODULE_FIRMWARE("isight.fw");
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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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module_usb_driver(isight_firmware_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
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