[media] v4l: omap4iss: Add support for OMAP4 camera interface - Video devices

/*

 * TI OMAP4 ISS V4L2 Driver - Generic video node

 *

 * Copyright (C) 2012 Texas Instruments, Inc.

 *

 * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */

#ifndef OMAP4_ISS_VIDEO_H

#define OMAP4_ISS_VIDEO_H

#include <linux/v4l2-mediabus.h>

#include <media/media-entity.h>

#include <media/v4l2-dev.h>

#include <media/v4l2-fh.h>

#include <media/videobuf2-core.h>

#include <media/videobuf2-dma-contig.h>

#define ISS_VIDEO_DRIVER_NAME		"issvideo"

#define ISS_VIDEO_DRIVER_VERSION	"0.0.2"

struct iss_device;

struct iss_video;

struct v4l2_mbus_framefmt;

struct v4l2_pix_format;

/*

 * struct iss_format_info - ISS media bus format information

 * @code: V4L2 media bus format code

 * @truncated: V4L2 media bus format code for the same format truncated to 10

 *	bits. Identical to @code if the format is 10 bits wide or less.

 * @uncompressed: V4L2 media bus format code for the corresponding uncompressed

 *	format. Identical to @code if the format is not DPCM compressed.

 * @flavor: V4L2 media bus format code for the same pixel layout but

 *	shifted to be 8 bits per pixel. =0 if format is not shiftable.

 * @pixelformat: V4L2 pixel format FCC identifier

 * @bpp: Bits per pixel

 */

struct iss_format_info {

	enum v4l2_mbus_pixelcode code;

	enum v4l2_mbus_pixelcode truncated;

	enum v4l2_mbus_pixelcode uncompressed;

	enum v4l2_mbus_pixelcode flavor;

	u32 pixelformat;

	unsigned int bpp;

};

enum iss_pipeline_stream_state {

	ISS_PIPELINE_STREAM_STOPPED = 0,

	ISS_PIPELINE_STREAM_CONTINUOUS = 1,

	ISS_PIPELINE_STREAM_SINGLESHOT = 2,

};

enum iss_pipeline_state {

	/* The stream has been started on the input video node. */

	ISS_PIPELINE_STREAM_INPUT = 1,

	/* The stream has been started on the output video node. */

	ISS_PIPELINE_STREAM_OUTPUT = (1 << 1),

	/* At least one buffer is queued on the input video node. */

	ISS_PIPELINE_QUEUE_INPUT = (1 << 2),

	/* At least one buffer is queued on the output video node. */

	ISS_PIPELINE_QUEUE_OUTPUT = (1 << 3),

	/* The input entity is idle, ready to be started. */

	ISS_PIPELINE_IDLE_INPUT = (1 << 4),

	/* The output entity is idle, ready to be started. */

	ISS_PIPELINE_IDLE_OUTPUT = (1 << 5),

	/* The pipeline is currently streaming. */

	ISS_PIPELINE_STREAM = (1 << 6),

};

/*

 * struct iss_pipeline - An OMAP4 ISS hardware pipeline

 * @error: A hardware error occurred during capture

 */

struct iss_pipeline {

	struct media_pipeline pipe;

	spinlock_t lock;		/* Pipeline state and queue flags */

	unsigned int state;

	enum iss_pipeline_stream_state stream_state;

	struct iss_video *input;

	struct iss_video *output;

	atomic_t frame_number;

	bool do_propagation; /* of frame number */

	bool error;

	struct v4l2_fract max_timeperframe;

	struct v4l2_subdev *external;

	unsigned int external_rate;

	int external_bpp;

};

#define to_iss_pipeline(__e) \

	container_of((__e)->pipe, struct iss_pipeline, pipe)

static inline int iss_pipeline_ready(struct iss_pipeline *pipe)

{

	return pipe->state == (ISS_PIPELINE_STREAM_INPUT |

			       ISS_PIPELINE_STREAM_OUTPUT |

			       ISS_PIPELINE_QUEUE_INPUT |

			       ISS_PIPELINE_QUEUE_OUTPUT |

			       ISS_PIPELINE_IDLE_INPUT |

			       ISS_PIPELINE_IDLE_OUTPUT);

}

/*

 * struct iss_buffer - ISS buffer

 * @buffer: ISS video buffer

 * @iss_addr: Physical address of the buffer.

 */

struct iss_buffer {

	/* common v4l buffer stuff -- must be first */

	struct vb2_buffer	vb;

	struct list_head	list;

	dma_addr_t iss_addr;

};

#define to_iss_buffer(buf)	container_of(buf, struct iss_buffer, buffer)

enum iss_video_dmaqueue_flags {

	/* Set if DMA queue becomes empty when ISS_PIPELINE_STREAM_CONTINUOUS */

	ISS_VIDEO_DMAQUEUE_UNDERRUN = (1 << 0),

	/* Set when queuing buffer to an empty DMA queue */

	ISS_VIDEO_DMAQUEUE_QUEUED = (1 << 1),

};

#define iss_video_dmaqueue_flags_clr(video)	\

			({ (video)->dmaqueue_flags = 0; })

/*

 * struct iss_video_operations - ISS video operations

 * @queue:	Resume streaming when a buffer is queued. Called on VIDIOC_QBUF

 *		if there was no buffer previously queued.

 */

struct iss_video_operations {

	int(*queue)(struct iss_video *video, struct iss_buffer *buffer);

};

struct iss_video {

	struct video_device video;

	enum v4l2_buf_type type;

	struct media_pad pad;

	struct mutex mutex;		/* format and crop settings */

	atomic_t active;

	struct iss_device *iss;

	unsigned int capture_mem;

	unsigned int bpl_alignment;	/* alignment value */

	unsigned int bpl_zero_padding;	/* whether the alignment is optional */

	unsigned int bpl_max;		/* maximum bytes per line value */

	unsigned int bpl_value;		/* bytes per line value */

	unsigned int bpl_padding;	/* padding at end of line */

	/* Entity video node streaming */

	unsigned int streaming:1;

	/* Pipeline state */

	struct iss_pipeline pipe;

	struct mutex stream_lock;	/* pipeline and stream states */

	/* Video buffers queue */

	struct vb2_queue *queue;

	spinlock_t qlock;	/* Spinlock for dmaqueue */

	struct list_head dmaqueue;

	enum iss_video_dmaqueue_flags dmaqueue_flags;

	struct vb2_alloc_ctx *alloc_ctx;

	const struct iss_video_operations *ops;

};

#define to_iss_video(vdev)	container_of(vdev, struct iss_video, video)

struct iss_video_fh {

	struct v4l2_fh vfh;

	struct iss_video *video;

	struct vb2_queue queue;

	struct v4l2_format format;

	struct v4l2_fract timeperframe;

};

#define to_iss_video_fh(fh)	container_of(fh, struct iss_video_fh, vfh)

#define iss_video_queue_to_iss_video_fh(q) \

				container_of(q, struct iss_video_fh, queue)

int omap4iss_video_init(struct iss_video *video, const char *name);

void omap4iss_video_cleanup(struct iss_video *video);

int omap4iss_video_register(struct iss_video *video,

			    struct v4l2_device *vdev);

void omap4iss_video_unregister(struct iss_video *video);

struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video);

struct media_pad *omap4iss_video_remote_pad(struct iss_video *video);

const struct iss_format_info *

omap4iss_video_format_info(enum v4l2_mbus_pixelcode code);

#endif /* OMAP4_ISS_VIDEO_H */