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/*
* Copyright (c) 2013 Lubomir Rintel
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Fushicai USBTV007 Audio-Video Grabber Driver
*
* Product web site:
* http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
*
* Following LWN articles were very useful in construction of this driver:
* Video4Linux2 API series: http://lwn.net/Articles/203924/
* videobuf2 API explanation: http://lwn.net/Articles/447435/
* Thanks go to Jonathan Corbet for providing this quality documentation.
* He is awesome.
*
* No physical hardware was harmed running Windows during the
* reverse-engineering activity
*/
#include "usbtv.h"
int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size)
{
int ret;
int pipe = usb_rcvctrlpipe(usbtv->udev, 0);
int i;
for (i = 0; i < size; i++) {
u16 index = regs[i][0];
u16 value = regs[i][1];
ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, index, NULL, 0, 0);
if (ret < 0)
return ret;
}
return 0;
}
static int usbtv_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
int ret;
int size;
struct device *dev = &intf->dev;
struct usbtv *usbtv;
struct usb_host_endpoint *ep;
/* Checks that the device is what we think it is. */
if (intf->num_altsetting != 2)
return -ENODEV;
if (intf->altsetting[1].desc.bNumEndpoints != 4)
return -ENODEV;
ep = &intf->altsetting[1].endpoint[0];
/* Packet size is split into 11 bits of base size and count of
* extra multiplies of it.*/
size = usb_endpoint_maxp(&ep->desc);
size = size * usb_endpoint_maxp_mult(&ep->desc);
/* Device structure */
usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
if (usbtv == NULL)
return -ENOMEM;
usbtv->dev = dev;
usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
usbtv->iso_size = size;
usb_set_intfdata(intf, usbtv);
ret = usbtv_video_init(usbtv);
if (ret < 0)
goto usbtv_video_fail;
ret = usbtv_audio_init(usbtv);
if (ret < 0)
goto usbtv_audio_fail;
/* for simplicity we exploit the v4l2_device reference counting */
v4l2_device_get(&usbtv->v4l2_dev);
dev_info(dev, "Fushicai USBTV007 Audio-Video Grabber\n");
return 0;
usbtv_audio_fail:
usbtv_video_free(usbtv);
usbtv_video_fail:
usb_set_intfdata(intf, NULL);
usb_put_dev(usbtv->udev);
kfree(usbtv);
return ret;
}
static void usbtv_disconnect(struct usb_interface *intf)
{
struct usbtv *usbtv = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
if (!usbtv)
return;
usbtv_audio_free(usbtv);
usbtv_video_free(usbtv);
usb_put_dev(usbtv->udev);
usbtv->udev = NULL;
/* the usbtv structure will be deallocated when v4l2 will be
done using it */
v4l2_device_put(&usbtv->v4l2_dev);
}
static const struct usb_device_id usbtv_id_table[] = {
{ USB_DEVICE(0x1b71, 0x3002) },
{}
};
MODULE_DEVICE_TABLE(usb, usbtv_id_table);
MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli");
MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver");
MODULE_LICENSE("Dual BSD/GPL");
static struct usb_driver usbtv_usb_driver = {
.name = "usbtv",
.id_table = usbtv_id_table,
.probe = usbtv_probe,
.disconnect = usbtv_disconnect,
};
module_usb_driver(usbtv_usb_driver);
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