1 /* 2 * Fushicai USBTV007 Audio-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_AUDIO_ENDP 0x83 32 #define USBTV_BASE 0xc000 33 #define USBTV_REQUEST_REG 12 34 35 /* Number of concurrent isochronous urbs submitted. 36 * Higher numbers was seen to overly saturate the USB bus. */ 37 #define USBTV_ISOC_TRANSFERS 16 38 #define USBTV_ISOC_PACKETS 8 39 40 #define USBTV_CHUNK_SIZE 256 41 #define USBTV_CHUNK 240 42 43 #define USBTV_AUDIO_URBSIZE 20480 44 #define USBTV_AUDIO_HDRSIZE 4 45 #define USBTV_AUDIO_BUFFER 65536 46 47 /* Chunk header. */ 48 #define USBTV_MAGIC_OK(chunk) ((be32_to_cpu(chunk[0]) & 0xff000000) \ 49 == 0x88000000) 50 #define USBTV_FRAME_ID(chunk) ((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16) 51 #define USBTV_ODD(chunk) ((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15) 52 #define USBTV_CHUNK_NO(chunk) (be32_to_cpu(chunk[0]) & 0x00000fff) 53 54 #define USBTV_TV_STD (V4L2_STD_525_60 | V4L2_STD_PAL) 55 56 /* parameters for supported TV norms */ 57 struct usbtv_norm_params { 58 v4l2_std_id norm; 59 int cap_width, cap_height; 60 }; 61 62 /* A single videobuf2 frame buffer. */ 63 struct usbtv_buf { 64 struct vb2_buffer vb; 65 struct list_head list; 66 }; 67 68 /* Per-device structure. */ 69 struct usbtv { 70 struct device *dev; 71 struct usb_device *udev; 72 73 /* video */ 74 struct v4l2_device v4l2_dev; 75 struct video_device vdev; 76 struct vb2_queue vb2q; 77 struct mutex v4l2_lock; 78 struct mutex vb2q_lock; 79 80 /* List of videobuf2 buffers protected by a lock. */ 81 spinlock_t buflock; 82 struct list_head bufs; 83 84 /* Number of currently processed frame, useful find 85 * out when a new one begins. */ 86 u32 frame_id; 87 int chunks_done; 88 89 enum { 90 USBTV_COMPOSITE_INPUT, 91 USBTV_SVIDEO_INPUT, 92 } input; 93 v4l2_std_id norm; 94 int width, height; 95 int n_chunks; 96 int iso_size; 97 unsigned int sequence; 98 struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS]; 99 100 /* audio */ 101 struct snd_card *snd; 102 struct snd_pcm_substream *snd_substream; 103 atomic_t snd_stream; 104 struct work_struct snd_trigger; 105 struct urb *snd_bulk_urb; 106 size_t snd_buffer_pos; 107 size_t snd_period_pos; 108 }; 109 110 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size); 111 112 int usbtv_video_init(struct usbtv *usbtv); 113 void usbtv_video_free(struct usbtv *usbtv); 114 115 int usbtv_audio_init(struct usbtv *usbtv); 116 void usbtv_audio_free(struct usbtv *usbtv); 117 void usbtv_audio_suspend(struct usbtv *usbtv); 118 void usbtv_audio_resume(struct usbtv *usbtv); 119