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); 100