2 * Fushicai USBTV007 Video Grabber Driver
5 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
7 * Following LWN articles were very useful in construction of this driver:
8 * Video4Linux2 API series: http://lwn.net/Articles/203924/
9 * videobuf2 API explanation: http://lwn.net/Articles/447435/
10 * Thanks go to Jonathan Corbet for providing this quality documentation.
13 * Copyright (c) 2013 Lubomir Rintel
14 * All rights reserved.
15 * No physical hardware was harmed running Windows during the
16 * reverse-engineering activity
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions, and the following disclaimer,
23 * without modification.
24 * 2. The name of the author may not be used to endorse or promote products
25 * derived from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL").
31 #include <linux/module.h>
35 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size)
38 int pipe = usb_rcvctrlpipe(usbtv->udev, 0);
41 for (i = 0; i < size; i++) {
42 u16 index = regs[i][0];
43 u16 value = regs[i][1];
45 ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
46 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
47 value, index, NULL, 0, 0);
55 static int usbtv_probe(struct usb_interface *intf,
56 const struct usb_device_id *id)
60 struct device *dev = &intf->dev;
63 /* Checks that the device is what we think it is. */
64 if (intf->num_altsetting != 2)
66 if (intf->altsetting[1].desc.bNumEndpoints != 4)
69 /* Packet size is split into 11 bits of base size and count of
70 * extra multiplies of it.*/
71 size = usb_endpoint_maxp(&intf->altsetting[1].endpoint[0].desc);
72 size = (size & 0x07ff) * (((size & 0x1800) >> 11) + 1);
74 /* Device structure */
75 usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
79 usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
81 usbtv->iso_size = size;
83 usb_set_intfdata(intf, usbtv);
85 ret = usbtv_video_init(usbtv);
87 goto usbtv_video_fail;
89 /* for simplicity we exploit the v4l2_device reference counting */
90 v4l2_device_get(&usbtv->v4l2_dev);
92 dev_info(dev, "Fushicai USBTV007 Video Grabber\n");
101 static void usbtv_disconnect(struct usb_interface *intf)
103 struct usbtv *usbtv = usb_get_intfdata(intf);
104 usb_set_intfdata(intf, NULL);
109 usbtv_video_free(usbtv);
111 usb_put_dev(usbtv->udev);
114 /* the usbtv structure will be deallocated when v4l2 will be
116 v4l2_device_put(&usbtv->v4l2_dev);
119 struct usb_device_id usbtv_id_table[] = {
120 { USB_DEVICE(0x1b71, 0x3002) },
123 MODULE_DEVICE_TABLE(usb, usbtv_id_table);
125 MODULE_AUTHOR("Lubomir Rintel");
126 MODULE_DESCRIPTION("Fushicai USBTV007 Video Grabber Driver");
127 MODULE_LICENSE("Dual BSD/GPL");
129 struct usb_driver usbtv_usb_driver = {
131 .id_table = usbtv_id_table,
132 .probe = usbtv_probe,
133 .disconnect = usbtv_disconnect,
136 module_usb_driver(usbtv_usb_driver);