diff options
Diffstat (limited to 'drivers/usb/misc/isight_firmware.c')
| -rw-r--r-- | drivers/usb/misc/isight_firmware.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/usb/misc/isight_firmware.c b/drivers/usb/misc/isight_firmware.c new file mode 100644 index 000000000..4d30095d6 --- /dev/null +++ b/drivers/usb/misc/isight_firmware.c @@ -0,0 +1,131 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for loading USB isight firmware + * + * Copyright (C) 2008 Matthew Garrett <mjg@redhat.com> + * + * 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> +#include <linux/slab.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; + + buf[0] = 0x01; + if (usb_control_msg + (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 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; + } + + } + } + + buf[0] = 0x00; + if (usb_control_msg + (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 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, +}; + +module_usb_driver(isight_firmware_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); |