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5d62afbe95
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Keith Packard <keithp@keithp.com> Cc: Juergen Stuber <starblue@users.sourceforge.net> Cc: Cesar Miquel <miquel@df.uba.ar> Cc: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
131 lines
3.1 KiB
C
131 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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