1 /*
2 * Fushicai USBTV007 Audio-Video Grabber Driver
3 *
4 * Product web site:
5 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
6 *
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.
11 * He is awesome.
12 *
13 * Copyright (c) 2013 Lubomir Rintel
14 * All rights reserved.
15 * No physical hardware was harmed running Windows during the
16 * reverse-engineering activity
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
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.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL").
29 */
30
31 #include "usbtv.h"
32
usbtv_set_regs(struct usbtv * usbtv,const u16 regs[][2],int size)33 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size)
34 {
35 int ret;
36 int pipe = usb_rcvctrlpipe(usbtv->udev, 0);
37 int i;
38
39 for (i = 0; i < size; i++) {
40 u16 index = regs[i][0];
41 u16 value = regs[i][1];
42
43 ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
44 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
45 value, index, NULL, 0, USB_CTRL_GET_TIMEOUT);
46 if (ret < 0)
47 return ret;
48 }
49
50 return 0;
51 }
52
usbtv_probe(struct usb_interface * intf,const struct usb_device_id * id)53 static int usbtv_probe(struct usb_interface *intf,
54 const struct usb_device_id *id)
55 {
56 int ret;
57 int size;
58 struct device *dev = &intf->dev;
59 struct usbtv *usbtv;
60
61 /* Checks that the device is what we think it is. */
62 if (intf->num_altsetting != 2)
63 return -ENODEV;
64 if (intf->altsetting[1].desc.bNumEndpoints != 4)
65 return -ENODEV;
66
67 /* Packet size is split into 11 bits of base size and count of
68 * extra multiplies of it.*/
69 size = usb_endpoint_maxp(&intf->altsetting[1].endpoint[0].desc);
70 size = (size & 0x07ff) * (((size & 0x1800) >> 11) + 1);
71
72 /* Device structure */
73 usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
74 if (usbtv == NULL)
75 return -ENOMEM;
76 usbtv->dev = dev;
77 usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
78
79 usbtv->iso_size = size;
80
81 usb_set_intfdata(intf, usbtv);
82
83 ret = usbtv_video_init(usbtv);
84 if (ret < 0)
85 goto usbtv_video_fail;
86
87 ret = usbtv_audio_init(usbtv);
88 if (ret < 0)
89 goto usbtv_audio_fail;
90
91 /* for simplicity we exploit the v4l2_device reference counting */
92 v4l2_device_get(&usbtv->v4l2_dev);
93
94 dev_info(dev, "Fushicai USBTV007 Audio-Video Grabber\n");
95 return 0;
96
97 usbtv_audio_fail:
98 /* we must not free at this point */
99 v4l2_device_get(&usbtv->v4l2_dev);
100 /* this will undo the v4l2_device_get() */
101 usbtv_video_free(usbtv);
102
103 usbtv_video_fail:
104 usb_set_intfdata(intf, NULL);
105 usb_put_dev(usbtv->udev);
106 kfree(usbtv);
107
108 return ret;
109 }
110
usbtv_disconnect(struct usb_interface * intf)111 static void usbtv_disconnect(struct usb_interface *intf)
112 {
113 struct usbtv *usbtv = usb_get_intfdata(intf);
114
115 usb_set_intfdata(intf, NULL);
116
117 if (!usbtv)
118 return;
119
120 usbtv_audio_free(usbtv);
121 usbtv_video_free(usbtv);
122
123 usb_put_dev(usbtv->udev);
124 usbtv->udev = NULL;
125
126 /* the usbtv structure will be deallocated when v4l2 will be
127 done using it */
128 v4l2_device_put(&usbtv->v4l2_dev);
129 }
130
131 static struct usb_device_id usbtv_id_table[] = {
132 { USB_DEVICE(0x1b71, 0x3002) },
133 { USB_DEVICE(0x1f71, 0x3301) },
134 {}
135 };
136 MODULE_DEVICE_TABLE(usb, usbtv_id_table);
137
138 MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli");
139 MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver");
140 MODULE_LICENSE("Dual BSD/GPL");
141
142 static struct usb_driver usbtv_usb_driver = {
143 .name = "usbtv",
144 .id_table = usbtv_id_table,
145 .probe = usbtv_probe,
146 .disconnect = usbtv_disconnect,
147 };
148
149 module_usb_driver(usbtv_usb_driver);
150