drivers/media/usb/usbtv/usbtv.h

   1 /*
   2  * Fushicai USBTV007 Video Grabber Driver
   3  *
   4  * Copyright (c) 2013 Lubomir Rintel
   5  * All rights reserved.
   6  * No physical hardware was harmed running Windows during the
   7  * reverse-engineering activity
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions, and the following disclaimer,
  14  *    without modification.
  15  * 2. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * Alternatively, this software may be distributed under the terms of the
  19  * GNU General Public License ("GPL").
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/usb.h>
  25
  26 #include <media/v4l2-device.h>
  27 #include <media/videobuf2-vmalloc.h>
  28
  29 /* Hardware. */
  30 #define USBTV_VIDEO_ENDP        0x81
  31 #define USBTV_BASE              0xc000
  32 #define USBTV_REQUEST_REG       12
  33
  34 /* Number of concurrent isochronous urbs submitted.
  35  * Higher numbers was seen to overly saturate the USB bus. */
  36 #define USBTV_ISOC_TRANSFERS    16
  37 #define USBTV_ISOC_PACKETS      8
  38
  39 #define USBTV_CHUNK_SIZE        256
  40 #define USBTV_CHUNK             240
  41
  42 /* Chunk header. */
  43 #define USBTV_MAGIC_OK(chunk)   ((be32_to_cpu(chunk[0]) & 0xff000000) \
  44                                                         == 0x88000000)
  45 #define USBTV_FRAME_ID(chunk)   ((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16)
  46 #define USBTV_ODD(chunk)        ((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15)
  47 #define USBTV_CHUNK_NO(chunk)   (be32_to_cpu(chunk[0]) & 0x00000fff)
  48
  49 #define USBTV_TV_STD  (V4L2_STD_525_60 | V4L2_STD_PAL)
  50
  51 /* parameters for supported TV norms */
  52 struct usbtv_norm_params {
  53         v4l2_std_id norm;
  54         int cap_width, cap_height;
  55 };
  56
  57 /* A single videobuf2 frame buffer. */
  58 struct usbtv_buf {
  59         struct vb2_buffer vb;
  60         struct list_head list;
  61 };
  62
  63 /* Per-device structure. */
  64 struct usbtv {
  65         struct device *dev;
  66         struct usb_device *udev;
  67
  68         /* video */
  69         struct v4l2_device v4l2_dev;
  70         struct video_device vdev;
  71         struct vb2_queue vb2q;
  72         struct mutex v4l2_lock;
  73         struct mutex vb2q_lock;
  74
  75         /* List of videobuf2 buffers protected by a lock. */
  76         spinlock_t buflock;
  77         struct list_head bufs;
  78
  79         /* Number of currently processed frame, useful find
  80          * out when a new one begins. */
  81         u32 frame_id;
  82         int chunks_done;
  83
  84         enum {
  85                 USBTV_COMPOSITE_INPUT,
  86                 USBTV_SVIDEO_INPUT,
  87         } input;
  88         v4l2_std_id norm;
  89         int width, height;
  90         int n_chunks;
  91         int iso_size;
  92         unsigned int sequence;
  93         struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS];
  94 };
  95
  96 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size);
  97
  98 int usbtv_video_init(struct usbtv *usbtv);
  99 void usbtv_video_free(struct usbtv *usbtv);