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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
*
* No physical hardware was harmed running Windows during the
* reverse-engineering activity
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>
/* Hardware. */
#define USBTV_VIDEO_ENDP 0x81
#define USBTV_AUDIO_ENDP 0x83
#define USBTV_BASE 0xc000
#define USBTV_CONTROL_REG 11
#define USBTV_REQUEST_REG 12
/* Number of concurrent isochronous urbs submitted.
* Higher numbers was seen to overly saturate the USB bus. */
#define USBTV_ISOC_TRANSFERS 16
#define USBTV_ISOC_PACKETS 8
#define USBTV_CHUNK_SIZE 256
#define USBTV_CHUNK 240
#define USBTV_AUDIO_URBSIZE 20480
#define USBTV_AUDIO_HDRSIZE 4
#define USBTV_AUDIO_BUFFER 65536
/* Chunk header. */
#define USBTV_MAGIC_OK(chunk) ((be32_to_cpu(chunk[0]) & 0xff000000) \
== 0x88000000)
#define USBTV_FRAME_ID(chunk) ((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16)
#define USBTV_ODD(chunk) ((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15)
#define USBTV_CHUNK_NO(chunk) (be32_to_cpu(chunk[0]) & 0x00000fff)
#define USBTV_TV_STD (V4L2_STD_525_60 | V4L2_STD_PAL | \
V4L2_STD_PAL_Nc | V4L2_STD_SECAM)
/* parameters for supported TV norms */
struct usbtv_norm_params {
v4l2_std_id norm;
int cap_width, cap_height;
};
/* A single videobuf2 frame buffer. */
struct usbtv_buf {
struct vb2_v4l2_buffer vb;
struct list_head list;
};
/* Per-device structure. */
struct usbtv {
struct device *dev;
struct usb_device *udev;
/* video */
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler ctrl;
struct video_device vdev;
struct vb2_queue vb2q;
struct mutex v4l2_lock;
struct mutex vb2q_lock;
/* List of videobuf2 buffers protected by a lock. */
spinlock_t buflock;
struct list_head bufs;
/* Number of currently processed frame, useful find
* out when a new one begins. */
u32 frame_id;
int chunks_done;
enum {
USBTV_COMPOSITE_INPUT,
USBTV_SVIDEO_INPUT,
} input;
v4l2_std_id norm;
int width, height;
int n_chunks;
int iso_size;
int last_odd;
unsigned int sequence;
struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
/* audio */
struct snd_card *snd;
struct snd_pcm_substream *snd_substream;
atomic_t snd_stream;
struct work_struct snd_trigger;
struct urb *snd_bulk_urb;
size_t snd_buffer_pos;
size_t snd_period_pos;
};
int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size);
int usbtv_video_init(struct usbtv *usbtv);
void usbtv_video_free(struct usbtv *usbtv);
int usbtv_audio_init(struct usbtv *usbtv);
void usbtv_audio_free(struct usbtv *usbtv);
void usbtv_audio_suspend(struct usbtv *usbtv);
void usbtv_audio_resume(struct usbtv *usbtv);
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