path: root/drivers/media/video/mem2mem_testdev.c

/*
 * A virtual v4l2-mem2mem example device.
 *
 * This is a virtual device driver for testing mem-to-mem videobuf framework.
 * It simulates a device that uses memory buffers for both source and
 * destination, processes the data and issues an "irq" (simulated by a timer).
 * The device is capable of multi-instance, multi-buffer-per-transaction
 * operation (via the mem2mem framework).
 *
 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
 * Pawel Osciak, <pawel@osciak.com>
 * Marek Szyprowski, <m.szyprowski@samsung.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
 */
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include <linux/platform_device.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-vmalloc.h>

#define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev"

MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1.1");

#define MIN_W 32
#define MIN_H 32
#define MAX_W 640
#define MAX_H 480
#define DIM_ALIGN_MASK 7 /* 8-byte alignment for line length */

/* Flags that indicate a format can be used for capture/output */
#define MEM2MEM_CAPTURE	(1 << 0)
#define MEM2MEM_OUTPUT	(1 << 1)

#define MEM2MEM_NAME		"m2m-testdev"

/* Per queue */
#define MEM2MEM_DEF_NUM_BUFS	VIDEO_MAX_FRAME
/* In bytes, per queue */
#define MEM2MEM_VID_MEM_LIMIT	(16 * 1024 * 1024)

/* Default transaction time in msec */
#define MEM2MEM_DEF_TRANSTIME	1000
/* Default number of buffers per transaction */
#define MEM2MEM_DEF_TRANSLEN	1
#define MEM2MEM_COLOR_STEP	(0xff >> 4)
#define MEM2MEM_NUM_TILES	8

#define dprintk(dev, fmt, arg...) \
	v4l2_dbg(1, 1, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)


void m2mtest_dev_release(struct device *dev)
{}

static struct platform_device m2mtest_pdev = {
	.name		= MEM2MEM_NAME,
	.dev.release	= m2mtest_dev_release,
};

struct m2mtest_fmt {
	char	*name;
	u32	fourcc;
	int	depth;
	/* Types the format can be used for */
	u32	types;
};

static struct m2mtest_fmt formats[] = {
	{
		.name	= "RGB565 (BE)",
		.fourcc	= V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
		.depth	= 16,
		/* Both capture and output format */
		.types	= MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
	},
	{
		.name	= "4:2:2, packed, YUYV",
		.fourcc	= V4L2_PIX_FMT_YUYV,
		.depth	= 16,
		/* Output-only format */
		.types	= MEM2MEM_OUTPUT,
	},
};

/* Per-queue, driver-specific private data */
struct m2mtest_q_data {
	unsigned int		width;
	unsigned int		height;
	unsigned int		sizeimage;
	struct m2mtest_fmt	*fmt;
};

enum {
	V4L2_M2M_SRC = 0,
	V4L2_M2M_DST = 1,
};

#define V4L2_CID_TRANS_TIME_MSEC	V4L2_CID_PRIVATE_BASE
#define V4L2_CID_TRANS_NUM_BUFS		(V4L2_CID_PRIVATE_BASE + 1)

static struct v4l2_queryctrl m2mtest_ctrls[] = {
	{
		.id		= V4L2_CID_TRANS_TIME_MSEC,
		.type		= V4L2_CTRL_TYPE_INTEGER,
		.name		= "Transaction time (msec)",
		.minimum	= 1,
		.maximum	= 10000,
		.step		= 100,
		.default_value	= 1000,
		.flags		= 0,
	}, {
		.id		= V4L2_CID_TRANS_NUM_BUFS,
		.type		= V4L2_CTRL_TYPE_INTEGER,
		.name		= "Buffers per transaction",
		.minimum	= 1,
		.maximum	= MEM2MEM_DEF_NUM_BUFS,
		.step		= 1,
		.default_value	= 1,
		.flags		= 0,
	},
};

#define NUM_FORMATS ARRAY_SIZE(formats)

static struct m2mtest_fmt *find_format(struct v4l2_format *f)
{
	struct m2mtest_fmt *fmt;
	unsigned int k;

	for (k = 0; k < NUM_FORMATS; k++) {
		fmt = &formats[k];
		if (fmt->fourcc == f->fmt.pix.pixelformat)
			break;
	}

	if (k == NUM_FORMATS)
		return NULL;

	return &formats[k];
}

struct m2mtest_dev {
	struct v4l2_device	v4l2_dev;
	struct video_device	*vfd;

	atomic_t		num_inst;
	struct mutex		dev_mutex;
	spinlock_t		irqlock;

	struct timer_list	timer;

	struct v4l2_m2m_dev	*m2m_dev;
};

struct m2mtest_ctx {
	struct m2mtest_dev	*dev;

	/* Processed buffers in this transaction */
	u8			num_processed;

	/* Transaction length (i.e. how many buffers per transaction) */
	u32			translen;
	/* Transaction time (i.e. simulated processing time) in milliseconds */
	u32			transtime;

	/* Abort requested by m2m */
	int			aborting;

	struct v4l2_m2m_ctx	*m2m_ctx;

	/* Source and destination queue data */
	struct m2mtest_q_data   q_data[2];
};

static struct m2mtest_q_data *get_q_data(struct m2mtest_ctx *ctx,
					 enum v4l2_buf_type type)
{
	switch (type) {