100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
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* Fushicai USBTV007 Video Grabber Driver
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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 <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <media/v4l2-device.h>
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#include <media/videobuf2-vmalloc.h>
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/* Hardware. */
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#define USBTV_VIDEO_ENDP 0x81
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#define USBTV_BASE 0xc000
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#define USBTV_REQUEST_REG 12
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/* Number of concurrent isochronous urbs submitted.
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* Higher numbers was seen to overly saturate the USB bus. */
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#define USBTV_ISOC_TRANSFERS 16
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#define USBTV_ISOC_PACKETS 8
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#define USBTV_CHUNK_SIZE 256
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#define USBTV_CHUNK 240
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/* Chunk header. */
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#define USBTV_MAGIC_OK(chunk) ((be32_to_cpu(chunk[0]) & 0xff000000) \
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== 0x88000000)
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#define USBTV_FRAME_ID(chunk) ((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16)
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#define USBTV_ODD(chunk) ((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15)
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#define USBTV_CHUNK_NO(chunk) (be32_to_cpu(chunk[0]) & 0x00000fff)
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#define USBTV_TV_STD (V4L2_STD_525_60 | V4L2_STD_PAL)
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/* parameters for supported TV norms */
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struct usbtv_norm_params {
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v4l2_std_id norm;
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int cap_width, cap_height;
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};
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/* A single videobuf2 frame buffer. */
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struct usbtv_buf {
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struct vb2_buffer vb;
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struct list_head list;
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};
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/* Per-device structure. */
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struct usbtv {
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struct device *dev;
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struct usb_device *udev;
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/* video */
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct vb2_queue vb2q;
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struct mutex v4l2_lock;
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struct mutex vb2q_lock;
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/* List of videobuf2 buffers protected by a lock. */
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spinlock_t buflock;
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struct list_head bufs;
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/* Number of currently processed frame, useful find
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* out when a new one begins. */
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u32 frame_id;
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int chunks_done;
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enum {
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USBTV_COMPOSITE_INPUT,
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USBTV_SVIDEO_INPUT,
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} input;
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v4l2_std_id norm;
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int width, height;
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int n_chunks;
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int iso_size;
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unsigned int sequence;
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struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
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};
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int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size);
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int usbtv_video_init(struct usbtv *usbtv);
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void usbtv_video_free(struct usbtv *usbtv);
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