1 /* 2 * Copyright (c) 2013 Lubomir Rintel 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions, and the following disclaimer, 10 * without modification. 11 * 2. The name of the author may not be used to endorse or promote products 12 * derived from this software without specific prior written permission. 13 * 14 * Alternatively, this software may be distributed under the terms of the 15 * GNU General Public License ("GPL"). 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 /* 30 * Fushicai USBTV007 Audio-Video Grabber Driver 31 * 32 * No physical hardware was harmed running Windows during the 33 * reverse-engineering activity 34 */ 35 36 #include <linux/module.h> 37 #include <linux/slab.h> 38 #include <linux/usb.h> 39 40 #include <media/v4l2-device.h> 41 #include <media/videobuf2-v4l2.h> 42 #include <media/videobuf2-vmalloc.h> 43 44 /* Hardware. */ 45 #define USBTV_VIDEO_ENDP 0x81 46 #define USBTV_AUDIO_ENDP 0x83 47 #define USBTV_BASE 0xc000 48 #define USBTV_REQUEST_REG 12 49 50 /* Number of concurrent isochronous urbs submitted. 51 * Higher numbers was seen to overly saturate the USB bus. */ 52 #define USBTV_ISOC_TRANSFERS 16 53 #define USBTV_ISOC_PACKETS 8 54 55 #define USBTV_CHUNK_SIZE 256 56 #define USBTV_CHUNK 240 57 58 #define USBTV_AUDIO_URBSIZE 20480 59 #define USBTV_AUDIO_HDRSIZE 4 60 #define USBTV_AUDIO_BUFFER 65536 61 62 /* Chunk header. */ 63 #define USBTV_MAGIC_OK(chunk) ((be32_to_cpu(chunk[0]) & 0xff000000) \ 64 == 0x88000000) 65 #define USBTV_FRAME_ID(chunk) ((be32_to_cpu(chunk[0]) & 0x00ff0000) >> 16) 66 #define USBTV_ODD(chunk) ((be32_to_cpu(chunk[0]) & 0x0000f000) >> 15) 67 #define USBTV_CHUNK_NO(chunk) (be32_to_cpu(chunk[0]) & 0x00000fff) 68 69 #define USBTV_TV_STD (V4L2_STD_525_60 | V4L2_STD_PAL) 70 71 /* parameters for supported TV norms */ 72 struct usbtv_norm_params { 73 v4l2_std_id norm; 74 int cap_width, cap_height; 75 }; 76 77 /* A single videobuf2 frame buffer. */ 78 struct usbtv_buf { 79 struct vb2_v4l2_buffer vb; 80 struct list_head list; 81 }; 82 83 /* Per-device structure. */ 84 struct usbtv { 85 struct device *dev; 86 struct usb_device *udev; 87 88 /* video */ 89 struct v4l2_device v4l2_dev; 90 struct video_device vdev; 91 struct vb2_queue vb2q; 92 struct mutex v4l2_lock; 93 struct mutex vb2q_lock; 94 95 /* List of videobuf2 buffers protected by a lock. */ 96 spinlock_t buflock; 97 struct list_head bufs; 98 99 /* Number of currently processed frame, useful find 100 * out when a new one begins. */ 101 u32 frame_id; 102 int chunks_done; 103 104 enum { 105 USBTV_COMPOSITE_INPUT, 106 USBTV_SVIDEO_INPUT, 107 } input; 108 v4l2_std_id norm; 109 int width, height; 110 int n_chunks; 111 int iso_size; 112 int last_odd; 113 unsigned int sequence; 114 struct urb *isoc_urbs[USBTV_ISOC_TRANSFERS]; 115 116 /* audio */ 117 struct snd_card *snd; 118 struct snd_pcm_substream *snd_substream; 119 atomic_t snd_stream; 120 struct work_struct snd_trigger; 121 struct urb *snd_bulk_urb; 122 size_t snd_buffer_pos; 123 size_t snd_period_pos; 124 }; 125 126 int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size); 127 128 int usbtv_video_init(struct usbtv *usbtv); 129 void usbtv_video_free(struct usbtv *usbtv); 130 131 int usbtv_audio_init(struct usbtv *usbtv); 132 void usbtv_audio_free(struct usbtv *usbtv); 133 void usbtv_audio_suspend(struct usbtv *usbtv); 134 void usbtv_audio_resume(struct usbtv *usbtv); 135