1 /* 2 * Copyright (c) 2013 Lubomir Rintel 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions, and the following disclaimer, 10 * without modification. 11 * 2. The name of the author may not be used to endorse or promote products 12 * derived from this software without specific prior written permission. 13 * 14 * Alternatively, this software may be distributed under the terms of the 15 * GNU General Public License ("GPL"). 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 /* 30 * Fushicai USBTV007 Audio-Video Grabber Driver 31 * 32 * Product web site: 33 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html 34 * 35 * Following LWN articles were very useful in construction of this driver: 36 * Video4Linux2 API series: http://lwn.net/Articles/203924/ 37 * videobuf2 API explanation: http://lwn.net/Articles/447435/ 38 * Thanks go to Jonathan Corbet for providing this quality documentation. 39 * He is awesome. 40 * 41 * No physical hardware was harmed running Windows during the 42 * reverse-engineering activity 43 */ 44 45 #include "usbtv.h" 46 47 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size) 48 { 49 int ret; 50 int pipe = usb_rcvctrlpipe(usbtv->udev, 0); 51 int i; 52 53 for (i = 0; i < size; i++) { 54 u16 index = regs[i][0]; 55 u16 value = regs[i][1]; 56 57 ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG, 58 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 59 value, index, NULL, 0, 0); 60 if (ret < 0) 61 return ret; 62 } 63 64 return 0; 65 } 66 67 static int usbtv_probe(struct usb_interface *intf, 68 const struct usb_device_id *id) 69 { 70 int ret; 71 int size; 72 struct device *dev = &intf->dev; 73 struct usbtv *usbtv; 74 75 /* Checks that the device is what we think it is. */ 76 if (intf->num_altsetting != 2) 77 return -ENODEV; 78 if (intf->altsetting[1].desc.bNumEndpoints != 4) 79 return -ENODEV; 80 81 /* Packet size is split into 11 bits of base size and count of 82 * extra multiplies of it.*/ 83 size = usb_endpoint_maxp(&intf->altsetting[1].endpoint[0].desc); 84 size = (size & 0x07ff) * (((size & 0x1800) >> 11) + 1); 85 86 /* Device structure */ 87 usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL); 88 if (usbtv == NULL) 89 return -ENOMEM; 90 usbtv->dev = dev; 91 usbtv->udev = usb_get_dev(interface_to_usbdev(intf)); 92 93 usbtv->iso_size = size; 94 95 usb_set_intfdata(intf, usbtv); 96 97 ret = usbtv_video_init(usbtv); 98 if (ret < 0) 99 goto usbtv_video_fail; 100 101 ret = usbtv_audio_init(usbtv); 102 if (ret < 0) 103 goto usbtv_audio_fail; 104 105 /* for simplicity we exploit the v4l2_device reference counting */ 106 v4l2_device_get(&usbtv->v4l2_dev); 107 108 dev_info(dev, "Fushicai USBTV007 Audio-Video Grabber\n"); 109 return 0; 110 111 usbtv_audio_fail: 112 usbtv_video_free(usbtv); 113 114 usbtv_video_fail: 115 usb_set_intfdata(intf, NULL); 116 usb_put_dev(usbtv->udev); 117 kfree(usbtv); 118 119 return ret; 120 } 121 122 static void usbtv_disconnect(struct usb_interface *intf) 123 { 124 struct usbtv *usbtv = usb_get_intfdata(intf); 125 126 usb_set_intfdata(intf, NULL); 127 128 if (!usbtv) 129 return; 130 131 usbtv_audio_free(usbtv); 132 usbtv_video_free(usbtv); 133 134 usb_put_dev(usbtv->udev); 135 usbtv->udev = NULL; 136 137 /* the usbtv structure will be deallocated when v4l2 will be 138 done using it */ 139 v4l2_device_put(&usbtv->v4l2_dev); 140 } 141 142 static struct usb_device_id usbtv_id_table[] = { 143 { USB_DEVICE(0x1b71, 0x3002) }, 144 {} 145 }; 146 MODULE_DEVICE_TABLE(usb, usbtv_id_table); 147 148 MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli"); 149 MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver"); 150 MODULE_LICENSE("Dual BSD/GPL"); 151 152 static struct usb_driver usbtv_usb_driver = { 153 .name = "usbtv", 154 .id_table = usbtv_id_table, 155 .probe = usbtv_probe, 156 .disconnect = usbtv_disconnect, 157 }; 158 159 module_usb_driver(usbtv_usb_driver); 160