linux/drivers/media/usb/usbtv/usbtv-core.c
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   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
  47int 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
  67static 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        struct usb_host_endpoint *ep;
  75
  76        /* Checks that the device is what we think it is. */
  77        if (intf->num_altsetting != 2)
  78                return -ENODEV;
  79        if (intf->altsetting[1].desc.bNumEndpoints != 4)
  80                return -ENODEV;
  81
  82        ep = &intf->altsetting[1].endpoint[0];
  83
  84        /* Packet size is split into 11 bits of base size and count of
  85         * extra multiplies of it.*/
  86        size = usb_endpoint_maxp(&ep->desc);
  87        size = (size & 0x07ff) * usb_endpoint_maxp_mult(&ep->desc);
  88
  89        /* Device structure */
  90        usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
  91        if (usbtv == NULL)
  92                return -ENOMEM;
  93        usbtv->dev = dev;
  94        usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
  95
  96        usbtv->iso_size = size;
  97
  98        usb_set_intfdata(intf, usbtv);
  99
 100        ret = usbtv_video_init(usbtv);
 101        if (ret < 0)
 102                goto usbtv_video_fail;
 103
 104        ret = usbtv_audio_init(usbtv);
 105        if (ret < 0)
 106                goto usbtv_audio_fail;
 107
 108        /* for simplicity we exploit the v4l2_device reference counting */
 109        v4l2_device_get(&usbtv->v4l2_dev);
 110
 111        dev_info(dev, "Fushicai USBTV007 Audio-Video Grabber\n");
 112        return 0;
 113
 114usbtv_audio_fail:
 115        usbtv_video_free(usbtv);
 116
 117usbtv_video_fail:
 118        usb_set_intfdata(intf, NULL);
 119        usb_put_dev(usbtv->udev);
 120        kfree(usbtv);
 121
 122        return ret;
 123}
 124
 125static void usbtv_disconnect(struct usb_interface *intf)
 126{
 127        struct usbtv *usbtv = usb_get_intfdata(intf);
 128
 129        usb_set_intfdata(intf, NULL);
 130
 131        if (!usbtv)
 132                return;
 133
 134        usbtv_audio_free(usbtv);
 135        usbtv_video_free(usbtv);
 136
 137        usb_put_dev(usbtv->udev);
 138        usbtv->udev = NULL;
 139
 140        /* the usbtv structure will be deallocated when v4l2 will be
 141           done using it */
 142        v4l2_device_put(&usbtv->v4l2_dev);
 143}
 144
 145static struct usb_device_id usbtv_id_table[] = {
 146        { USB_DEVICE(0x1b71, 0x3002) },
 147        {}
 148};
 149MODULE_DEVICE_TABLE(usb, usbtv_id_table);
 150
 151MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli");
 152MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver");
 153MODULE_LICENSE("Dual BSD/GPL");
 154
 155static struct usb_driver usbtv_usb_driver = {
 156        .name = "usbtv",
 157        .id_table = usbtv_id_table,
 158        .probe = usbtv_probe,
 159        .disconnect = usbtv_disconnect,
 160};
 161
 162module_usb_driver(usbtv_usb_driver);
 163
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