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-v4l2.h> 28 #include <media/videobuf2-vmalloc.h> 29 30 /* Hardware. */ 31 #define USBTV_VIDEO_ENDP 0x81 32 #define USBTV_AUDIO_ENDP 0x83 33 #define USBTV_BASE 0xc000 34 #define USBTV_REQUEST_REG 12 35 36 /* Number of concurrent isochronous urbs submitted. 37 * Higher numbers was seen to overly saturate the USB bus. */ 38 #define USBTV_ISOC_TRANSFERS 16 39 #define USBTV_ISOC_PACKETS 8 40 41 #define USBTV_CHUNK_SIZE 256 42 #define USBTV_CHUNK 240 43 44 #define USBTV_AUDIO_URBSIZE 20480 45 #define USBTV_AUDIO_HDRSIZE 4 46 #define USBTV_AUDIO_BUFFER 65536 47 48 /* Chunk header. */ 49 #define USBTV_MAGIC_OK(chunk) ((be32_to_cpu(chunk[0]) & 0xff000000) \ 50 == 0x88000000) 51 #define USBTV_FRAME_ID(chunk) ((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16) 52 #define USBTV_ODD(chunk) ((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15) 53 #define USBTV_CHUNK_NO(chunk) (be32_to_cpu(chunk[0]) & 0x00000fff) 54 55 #define USBTV_TV_STD (V4L2_STD_525_60 | V4L2_STD_PAL) 56 57 /* parameters for supported TV norms */ 58 struct usbtv_norm_params { 59 v4l2_std_id norm; 60 int cap_width, cap_height; 61 }; 62 63 /* A single videobuf2 frame buffer. */ 64 struct usbtv_buf { 65 struct vb2_v4l2_buffer vb; 66 struct list_head list; 67 }; 68 69 /* Per-device structure. */ 70 struct usbtv { 71 struct device *dev; 72 struct usb_device *udev; 73 74 /* video */ 75 struct v4l2_device v4l2_dev; 76 struct video_device vdev; 77 struct vb2_queue vb2q; 78 struct mutex v4l2_lock; 79 struct mutex vb2q_lock; 80 81 /* List of videobuf2 buffers protected by a lock. */ 82 spinlock_t buflock; 83 struct list_head bufs; 84 85 /* Number of currently processed frame, useful find 86 * out when a new one begins. */ 87 u32 frame_id; 88 int chunks_done; 89 90 enum { 91 USBTV_COMPOSITE_INPUT, 92 USBTV_SVIDEO_INPUT, 93 } input; 94 v4l2_std_id norm; 95 int width, height; 96 int n_chunks; 97 int iso_size; 98 int last_odd; 99 unsigned int sequence; 100 struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS]; 101 102 /* audio */ 103 struct snd_card *snd; 104 struct snd_pcm_substream *snd_substream; 105 atomic_t snd_stream; 106 struct work_struct snd_trigger; 107 struct urb *snd_bulk_urb; 108 size_t snd_buffer_pos; 109 size_t snd_period_pos; 110 }; 111 112 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size); 113 114 int usbtv_video_init(struct usbtv *usbtv); 115 void usbtv_video_free(struct usbtv *usbtv); 116 117 int usbtv_audio_init(struct usbtv *usbtv); 118 void usbtv_audio_free(struct usbtv *usbtv); 119 void usbtv_audio_suspend(struct usbtv *usbtv); 120 void usbtv_audio_resume(struct usbtv *usbtv); 121