146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
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* Fushicai USBTV007 Audio-Video Grabber Driver
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*
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* Product web site:
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* http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
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*
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* Following LWN articles were very useful in construction of this driver:
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* Video4Linux2 API series: http://lwn.net/Articles/203924/
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* videobuf2 API explanation: http://lwn.net/Articles/447435/
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* Thanks go to Jonathan Corbet for providing this quality documentation.
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* He is awesome.
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*
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* Copyright (c) 2013 Lubomir Rintel
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* All rights reserved.
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* No physical hardware was harmed running Windows during the
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* reverse-engineering activity
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL").
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*/
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#include "usbtv.h"
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int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size)
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{
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int ret;
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int pipe = usb_rcvctrlpipe(usbtv->udev, 0);
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int i;
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for (i = 0; i < size; i++) {
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u16 index = regs[i][0];
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u16 value = regs[i][1];
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ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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value, index, NULL, 0, 0);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int usbtv_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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int ret;
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int size;
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struct device *dev = &intf->dev;
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struct usbtv *usbtv;
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/* Checks that the device is what we think it is. */
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if (intf->num_altsetting != 2)
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return -ENODEV;
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if (intf->altsetting[1].desc.bNumEndpoints != 4)
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return -ENODEV;
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/* Packet size is split into 11 bits of base size and count of
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* extra multiplies of it.*/
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size = usb_endpoint_maxp(&intf->altsetting[1].endpoint[0].desc);
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size = (size & 0x07ff) * (((size & 0x1800) >> 11) + 1);
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/* Device structure */
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usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
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if (usbtv == NULL)
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return -ENOMEM;
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usbtv->dev = dev;
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usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
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usbtv->iso_size = size;
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usb_set_intfdata(intf, usbtv);
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ret = usbtv_video_init(usbtv);
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if (ret < 0)
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goto usbtv_video_fail;
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ret = usbtv_audio_init(usbtv);
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if (ret < 0)
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goto usbtv_audio_fail;
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/* for simplicity we exploit the v4l2_device reference counting */
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v4l2_device_get(&usbtv->v4l2_dev);
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dev_info(dev, "Fushicai USBTV007 Audio-Video Grabber\n");
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return 0;
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usbtv_audio_fail:
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usbtv_video_free(usbtv);
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usbtv_video_fail:
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usb_set_intfdata(intf, NULL);
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usb_put_dev(usbtv->udev);
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kfree(usbtv);
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return ret;
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}
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static void usbtv_disconnect(struct usb_interface *intf)
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{
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struct usbtv *usbtv = usb_get_intfdata(intf);
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usb_set_intfdata(intf, NULL);
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if (!usbtv)
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return;
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usbtv_audio_free(usbtv);
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usbtv_video_free(usbtv);
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usb_put_dev(usbtv->udev);
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usbtv->udev = NULL;
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/* the usbtv structure will be deallocated when v4l2 will be
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done using it */
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v4l2_device_put(&usbtv->v4l2_dev);
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}
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static struct usb_device_id usbtv_id_table[] = {
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{ USB_DEVICE(0x1b71, 0x3002) },
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{}
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};
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MODULE_DEVICE_TABLE(usb, usbtv_id_table);
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MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli");
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MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver");
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MODULE_LICENSE("Dual BSD/GPL");
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static struct usb_driver usbtv_usb_driver = {
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.name = "usbtv",
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.id_table = usbtv_id_table,
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.probe = usbtv_probe,
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.disconnect = usbtv_disconnect,
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};
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module_usb_driver(usbtv_usb_driver);
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