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/*
* Fushicai USBTV007 Video Grabber Driver
*
* Copyright (c) 2013 Lubomir Rintel
* All rights reserved.
* No physical hardware was harmed running Windows during the
* reverse-engineering activity
*
* 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").
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <media/v4l2-device.h>
#include <media/videobuf2-vmalloc.h>
/* Hardware. */
#define USBTV_VIDEO_ENDP 0x81
#define USBTV_BASE 0xc000
#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
/* 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)
/* 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_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 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;
unsigned int sequence;
struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
};
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);
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