1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/usb/misc/isight_firmware.c b/drivers/usb/misc/isight_firmware.c
new file mode 100644
index 0000000..9f30aa1
--- /dev/null
+++ b/drivers/usb/misc/isight_firmware.c
@@ -0,0 +1,140 @@
+/*
+ * 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 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];
+	u8 *ptr;
+
+	if (!buf)
+		return -ENOMEM;
+
+	if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) {
+		printk(KERN_ERR "Unable to load isight firmware\n");
+		return -ENODEV;
+	}
+
+	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");
+				kfree(buf);
+				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;
+}
+
+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>");