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1/*2 * Copyright (c) 2013 Lubomir Rintel3 * All rights reserved.4 *5 * Redistribution and use in source and binary forms, with or without6 * modification, are permitted provided that the following conditions7 * are met:8 * 1. Redistributions of source code must retain the above copyright9 * 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 products12 * derived from this software without specific prior written permission.13 *14 * Alternatively, this software may be distributed under the terms of the15 * GNU General Public License ("GPL").16 *17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.28 */29/*30 * Fushicai USBTV007 Audio-Video Grabber Driver31 *32 * Product web site:33 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html34 *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 the42 * reverse-engineering activity43 */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_sndctrlpipe(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, USB_CTRL_GET_TIMEOUT);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 of85 * extra multiplies of it.*/86 size = usb_endpoint_maxp(&ep->desc);87 size = size * 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 /* we must not free at this point */116 v4l2_device_get(&usbtv->v4l2_dev);117 /* this will undo the v4l2_device_get() */118 usbtv_video_free(usbtv);119 120usbtv_video_fail:121 usb_set_intfdata(intf, NULL);122 usb_put_dev(usbtv->udev);123 kfree(usbtv);124 125 return ret;126}127 128static void usbtv_disconnect(struct usb_interface *intf)129{130 struct usbtv *usbtv = usb_get_intfdata(intf);131 132 usb_set_intfdata(intf, NULL);133 134 if (!usbtv)135 return;136 137 usbtv_audio_free(usbtv);138 usbtv_video_free(usbtv);139 140 usb_put_dev(usbtv->udev);141 usbtv->udev = NULL;142 143 /* the usbtv structure will be deallocated when v4l2 will be144 done using it */145 v4l2_device_put(&usbtv->v4l2_dev);146}147 148static const struct usb_device_id usbtv_id_table[] = {149 { USB_DEVICE(0x1b71, 0x3002) },150 { USB_DEVICE(0x1f71, 0x3301) },151 { USB_DEVICE(0x1f71, 0x3306) },152 {}153};154MODULE_DEVICE_TABLE(usb, usbtv_id_table);155 156MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli");157MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver");158MODULE_LICENSE("Dual BSD/GPL");159 160static struct usb_driver usbtv_usb_driver = {161 .name = "usbtv",162 .id_table = usbtv_id_table,163 .probe = usbtv_probe,164 .disconnect = usbtv_disconnect,165};166 167module_usb_driver(usbtv_usb_driver);168