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path: root/drivers/usb/misc/isight_firmware.c
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Diffstat (limited to 'drivers/usb/misc/isight_firmware.c')
-rw-r--r--drivers/usb/misc/isight_firmware.c131
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>");