1/* 2 * TI OMAP4 ISS V4L2 Driver - Generic video node 3 * 4 * Copyright (C) 2012 Texas Instruments, Inc. 5 * 6 * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14#ifndef OMAP4_ISS_VIDEO_H 15#define OMAP4_ISS_VIDEO_H 16 17#include <linux/v4l2-mediabus.h> 18#include <media/media-entity.h> 19#include <media/v4l2-dev.h> 20#include <media/v4l2-fh.h> 21#include <media/videobuf2-core.h> 22#include <media/videobuf2-dma-contig.h> 23 24#define ISS_VIDEO_DRIVER_NAME "issvideo" 25#define ISS_VIDEO_DRIVER_VERSION "0.0.2" 26 27struct iss_device; 28struct iss_video; 29struct v4l2_mbus_framefmt; 30struct v4l2_pix_format; 31 32/* 33 * struct iss_format_info - ISS media bus format information 34 * @code: V4L2 media bus format code 35 * @truncated: V4L2 media bus format code for the same format truncated to 10 36 * bits. Identical to @code if the format is 10 bits wide or less. 37 * @uncompressed: V4L2 media bus format code for the corresponding uncompressed 38 * format. Identical to @code if the format is not DPCM compressed. 39 * @flavor: V4L2 media bus format code for the same pixel layout but 40 * shifted to be 8 bits per pixel. =0 if format is not shiftable. 41 * @pixelformat: V4L2 pixel format FCC identifier 42 * @bpp: Bits per pixel 43 * @description: Human-readable format description 44 */ 45struct iss_format_info { 46 enum v4l2_mbus_pixelcode code; 47 enum v4l2_mbus_pixelcode truncated; 48 enum v4l2_mbus_pixelcode uncompressed; 49 enum v4l2_mbus_pixelcode flavor; 50 u32 pixelformat; 51 unsigned int bpp; 52 const char *description; 53}; 54 55enum iss_pipeline_stream_state { 56 ISS_PIPELINE_STREAM_STOPPED = 0, 57 ISS_PIPELINE_STREAM_CONTINUOUS = 1, 58 ISS_PIPELINE_STREAM_SINGLESHOT = 2, 59}; 60 61enum iss_pipeline_state { 62 /* The stream has been started on the input video node. */ 63 ISS_PIPELINE_STREAM_INPUT = 1, 64 /* The stream has been started on the output video node. */ 65 ISS_PIPELINE_STREAM_OUTPUT = (1 << 1), 66 /* At least one buffer is queued on the input video node. */ 67 ISS_PIPELINE_QUEUE_INPUT = (1 << 2), 68 /* At least one buffer is queued on the output video node. */ 69 ISS_PIPELINE_QUEUE_OUTPUT = (1 << 3), 70 /* The input entity is idle, ready to be started. */ 71 ISS_PIPELINE_IDLE_INPUT = (1 << 4), 72 /* The output entity is idle, ready to be started. */ 73 ISS_PIPELINE_IDLE_OUTPUT = (1 << 5), 74 /* The pipeline is currently streaming. */ 75 ISS_PIPELINE_STREAM = (1 << 6), 76}; 77 78/* 79 * struct iss_pipeline - An OMAP4 ISS hardware pipeline 80 * @entities: Bitmask of entities in the pipeline (indexed by entity ID) 81 * @error: A hardware error occurred during capture 82 */ 83struct iss_pipeline { 84 struct media_pipeline pipe; 85 spinlock_t lock; /* Pipeline state and queue flags */ 86 unsigned int state; 87 enum iss_pipeline_stream_state stream_state; 88 struct iss_video *input; 89 struct iss_video *output; 90 unsigned int entities; 91 atomic_t frame_number; 92 bool do_propagation; /* of frame number */ 93 bool error; 94 struct v4l2_fract max_timeperframe; 95 struct v4l2_subdev *external; 96 unsigned int external_rate; 97 int external_bpp; 98}; 99 100#define to_iss_pipeline(__e) \ 101 container_of((__e)->pipe, struct iss_pipeline, pipe) 102 103static inline int iss_pipeline_ready(struct iss_pipeline *pipe) 104{ 105 return pipe->state == (ISS_PIPELINE_STREAM_INPUT | 106 ISS_PIPELINE_STREAM_OUTPUT | 107 ISS_PIPELINE_QUEUE_INPUT | 108 ISS_PIPELINE_QUEUE_OUTPUT | 109 ISS_PIPELINE_IDLE_INPUT | 110 ISS_PIPELINE_IDLE_OUTPUT); 111} 112 113/* 114 * struct iss_buffer - ISS buffer 115 * @buffer: ISS video buffer 116 * @iss_addr: Physical address of the buffer. 117 */ 118struct iss_buffer { 119 /* common v4l buffer stuff -- must be first */ 120 struct vb2_buffer vb; 121 struct list_head list; 122 dma_addr_t iss_addr; 123}; 124 125#define to_iss_buffer(buf) container_of(buf, struct iss_buffer, buffer) 126 127enum iss_video_dmaqueue_flags { 128 /* Set if DMA queue becomes empty when ISS_PIPELINE_STREAM_CONTINUOUS */ 129 ISS_VIDEO_DMAQUEUE_UNDERRUN = (1 << 0), 130 /* Set when queuing buffer to an empty DMA queue */ 131 ISS_VIDEO_DMAQUEUE_QUEUED = (1 << 1), 132}; 133 134#define iss_video_dmaqueue_flags_clr(video) \ 135 ({ (video)->dmaqueue_flags = 0; }) 136 137/* 138 * struct iss_video_operations - ISS video operations 139 * @queue: Resume streaming when a buffer is queued. Called on VIDIOC_QBUF 140 * if there was no buffer previously queued. 141 */ 142struct iss_video_operations { 143 int (*queue)(struct iss_video *video, struct iss_buffer *buffer); 144}; 145 146struct iss_video { 147 struct video_device video; 148 enum v4l2_buf_type type; 149 struct media_pad pad; 150 151 struct mutex mutex; /* format and crop settings */ 152 atomic_t active; 153 154 struct iss_device *iss; 155 156 unsigned int capture_mem; 157 unsigned int bpl_alignment; /* alignment value */ 158 unsigned int bpl_zero_padding; /* whether the alignment is optional */ 159 unsigned int bpl_max; /* maximum bytes per line value */ 160 unsigned int bpl_value; /* bytes per line value */ 161 unsigned int bpl_padding; /* padding at end of line */ 162 163 /* Pipeline state */ 164 struct iss_pipeline pipe; 165 struct mutex stream_lock; /* pipeline and stream states */ 166 bool error; 167 168 /* Video buffers queue */ 169 struct vb2_queue *queue; 170 spinlock_t qlock; /* protects dmaqueue and error */ 171 struct list_head dmaqueue; 172 enum iss_video_dmaqueue_flags dmaqueue_flags; 173 struct vb2_alloc_ctx *alloc_ctx; 174 175 const struct iss_video_operations *ops; 176}; 177 178#define to_iss_video(vdev) container_of(vdev, struct iss_video, video) 179 180struct iss_video_fh { 181 struct v4l2_fh vfh; 182 struct iss_video *video; 183 struct vb2_queue queue; 184 struct v4l2_format format; 185 struct v4l2_fract timeperframe; 186}; 187 188#define to_iss_video_fh(fh) container_of(fh, struct iss_video_fh, vfh) 189#define iss_video_queue_to_iss_video_fh(q) \ 190 container_of(q, struct iss_video_fh, queue) 191 192int omap4iss_video_init(struct iss_video *video, const char *name); 193void omap4iss_video_cleanup(struct iss_video *video); 194int omap4iss_video_register(struct iss_video *video, 195 struct v4l2_device *vdev); 196void omap4iss_video_unregister(struct iss_video *video); 197struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video); 198void omap4iss_video_cancel_stream(struct iss_video *video); 199struct media_pad *omap4iss_video_remote_pad(struct iss_video *video); 200 201const struct iss_format_info * 202omap4iss_video_format_info(enum v4l2_mbus_pixelcode code); 203 204#endif /* OMAP4_ISS_VIDEO_H */ 205