[media] rename drivers/media/video as .../platform

The remaining drivers are mostly platform drivers. Name the
dir to reflect it.

It makes sense to latter break it into a few other dirs.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 1131 insertions, 0 deletions

diff --git a/drivers/media/platform/mem2mem_testdev.c b/drivers/media/platform/mem2mem_testdev.c
new file mode 100644
index 000000000000..6d0d2fb11bbe
--- /dev/null
+++ b/drivers/media/platform/mem2mem_testdev.c
@@ -0,0 +1,1131 @@
+/*
+ * 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/v4l2-ctrls.h>
+#include <media/v4l2-event.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
+
+/* Flags that indicate processing mode */
+#define MEM2MEM_HFLIP   (1 << 0)
+#define MEM2MEM_VFLIP   (1 << 1)
+
+#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,
+        },
+};
+
+#define NUM_FORMATS ARRAY_SIZE(formats)
+
+/* 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_USER_BASE + 0x1000)
+#define V4L2_CID_TRANS_NUM_BUFS         (V4L2_CID_USER_BASE + 0x1001)
+
+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 v4l2_fh          fh;
+        struct m2mtest_dev      *dev;
+
+        struct v4l2_ctrl_handler hdl;
+
+        /* 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;
+
+        /* Processing mode */
+        int                     mode;
+
+        enum v4l2_colorspace    colorspace;
+
+        struct v4l2_m2m_ctx     *m2m_ctx;
+
+        /* Source and destination queue data */
+        struct m2mtest_q_data   q_data[2];
+};
+
+static inline struct m2mtest_ctx *file2ctx(struct file *file)
+{
+        return container_of(file->private_data, struct m2mtest_ctx, fh);
+}
+
+static struct m2mtest_q_data *get_q_data(struct m2mtest_ctx *ctx,
+                                         enum v4l2_buf_type type)
+{
+        switch (type) {
+        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+                return &ctx->q_data[V4L2_M2M_SRC];
+        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+                return &ctx->q_data[V4L2_M2M_DST];
+        default:
+                BUG();
+        }
+        return NULL;
+}
+
+
+static int device_process(struct m2mtest_ctx *ctx,
+                          struct vb2_buffer *in_vb,
+                          struct vb2_buffer *out_vb)
+{
+        struct m2mtest_dev *dev = ctx->dev;
+        struct m2mtest_q_data *q_data;
+        u8 *p_in, *p_out;
+        int x, y, t, w;
+        int tile_w, bytes_left;
+        int width, height, bytesperline;
+
+        q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
+
+        width   = q_data->width;
+        height  = q_data->height;
+        bytesperline    = (q_data->width * q_data->fmt->depth) >> 3;
+
+        p_in = vb2_plane_vaddr(in_vb, 0);
+        p_out = vb2_plane_vaddr(out_vb, 0);
+        if (!p_in || !p_out) {
+                v4l2_err(&dev->v4l2_dev,
+                         "Acquiring kernel pointers to buffers failed\n");
+                return -EFAULT;
+        }
+
+        if (vb2_plane_size(in_vb, 0) > vb2_plane_size(out_vb, 0)) {
+                v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
+                return -EINVAL;
+        }
+
+        tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
+                / MEM2MEM_NUM_TILES;
+        bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES;
+        w = 0;
+
+        switch (ctx->mode) {
+        case MEM2MEM_HFLIP | MEM2MEM_VFLIP:
+                p_out += bytesperline * height - bytes_left;
+                for (y = 0; y < height; ++y) {
+                        for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
+                                if (w & 0x1) {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *--p_out = *p_in++ +
+                                                        MEM2MEM_COLOR_STEP;
+                                } else {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *--p_out = *p_in++ -
+                                                        MEM2MEM_COLOR_STEP;
+                                }
+                                ++w;
+                        }
+                        p_in += bytes_left;
+                        p_out -= bytes_left;
+                }
+                break;
+
+        case MEM2MEM_HFLIP:
+                for (y = 0; y < height; ++y) {
+                        p_out += MEM2MEM_NUM_TILES * tile_w;
+                        for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
+                                if (w & 0x01) {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *--p_out = *p_in++ +
+                                                        MEM2MEM_COLOR_STEP;
+                                } else {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *--p_out = *p_in++ -
+                                                        MEM2MEM_COLOR_STEP;
+                                }
+                                ++w;
+                        }
+                        p_in += bytes_left;
+                        p_out += bytesperline;
+                }
+                break;
+
+        case MEM2MEM_VFLIP:
+                p_out += bytesperline * (height - 1);
+                for (y = 0; y < height; ++y) {
+                        for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
+                                if (w & 0x1) {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *p_out++ = *p_in++ +
+                                                        MEM2MEM_COLOR_STEP;
+                                } else {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *p_out++ = *p_in++ -
+                                                        MEM2MEM_COLOR_STEP;
+                                }
+                                ++w;
+                        }
+                        p_in += bytes_left;
+                        p_out += bytes_left - 2 * bytesperline;
+                }
+                break;
+
+        default:
+                for (y = 0; y < height; ++y) {
+                        for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
+                                if (w & 0x1) {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *p_out++ = *p_in++ +
+                                                        MEM2MEM_COLOR_STEP;
+                                } else {
+                                        for (x = 0; x < tile_w; ++x)
+                                                *p_out++ = *p_in++ -
+                                                        MEM2MEM_COLOR_STEP;
+                                }
+                                ++w;
+                        }
+                        p_in += bytes_left;
+                        p_out += bytes_left;
+                }
+        }
+
+        return 0;
+}
+
+static void schedule_irq(struct m2mtest_dev *dev, int msec_timeout)
+{
+        dprintk(dev, "Scheduling a simulated irq\n");
+        mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout));
+}
+
+/*
+ * mem2mem callbacks
+ */
+
+/**
+ * job_ready() - check whether an instance is ready to be scheduled to run
+ */
+static int job_ready(void *priv)
+{
+        struct m2mtest_ctx *ctx = priv;
+
+        if (v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) < ctx->translen
+            || v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx) < ctx->translen) {
+                dprintk(ctx->dev, "Not enough buffers available\n");
+                return 0;
+        }
+
+        return 1;
+}
+
+static void job_abort(void *priv)
+{
+        struct m2mtest_ctx *ctx = priv;
+
+        /* Will cancel the transaction in the next interrupt handler */
+        ctx->aborting = 1;
+}
+
+static void m2mtest_lock(void *priv)
+{
+        struct m2mtest_ctx *ctx = priv;
+        struct m2mtest_dev *dev = ctx->dev;
+        mutex_lock(&dev->dev_mutex);
+}
+
+static void m2mtest_unlock(void *priv)
+{
+        struct m2mtest_ctx *ctx = priv;
+        struct m2mtest_dev *dev = ctx->dev;
+        mutex_unlock(&dev->dev_mutex);
+}
+
+
+/* device_run() - prepares and starts the device
+ *
+ * This simulates all the immediate preparations required before starting
+ * a device. This will be called by the framework when it decides to schedule
+ * a particular instance.
+ */
+static void device_run(void *priv)
+{
+        struct m2mtest_ctx *ctx = priv;
+        struct m2mtest_dev *dev = ctx->dev;
+        struct vb2_buffer *src_buf, *dst_buf;
+
+        src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
+        dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
+
+        device_process(ctx, src_buf, dst_buf);
+
+        /* Run a timer, which simulates a hardware irq  */
+        schedule_irq(dev, ctx->transtime);
+}
+
+static void device_isr(unsigned long priv)
+{
+        struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv;
+        struct m2mtest_ctx *curr_ctx;
+        struct vb2_buffer *src_vb, *dst_vb;
+        unsigned long flags;
+
+        curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev);
+
+        if (NULL == curr_ctx) {
+                printk(KERN_ERR
+                        "Instance released before the end of transaction\n");
+                return;
+        }
+
+        src_vb = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx);
+        dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx);
+
+        curr_ctx->num_processed++;
+
+        spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
+        v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
+        v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
+        spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
+
+        if (curr_ctx->num_processed == curr_ctx->translen
+            || curr_ctx->aborting) {
+                dprintk(curr_ctx->dev, "Finishing transaction\n");
+                curr_ctx->num_processed = 0;
+                v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx);
+        } else {
+                device_run(curr_ctx);
+        }
+}
+
+/*
+ * video ioctls
+ */
+static int vidioc_querycap(struct file *file, void *priv,
+                           struct v4l2_capability *cap)
+{
+        strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
+        strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
+        strlcpy(cap->bus_info, MEM2MEM_NAME, sizeof(cap->bus_info));
+        cap->capabilities = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
+        cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+        return 0;
+}
+
+static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
+{
+        int i, num;
+        struct m2mtest_fmt *fmt;
+
+        num = 0;
+
+        for (i = 0; i < NUM_FORMATS; ++i) {
+                if (formats[i].types & type) {
+                        /* index-th format of type type found ? */
+                        if (num == f->index)
+                                break;
+                        /* Correct type but haven't reached our index yet,
+                         * just increment per-type index */
+                        ++num;
+                }
+        }
+
+        if (i < NUM_FORMATS) {
+                /* Format found */
+                fmt = &formats[i];
+                strncpy(f->description, fmt->name, sizeof(f->description) - 1);
+                f->pixelformat = fmt->fourcc;
+                return 0;
+        }
+
+        /* Format not found */
+        return -EINVAL;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+                                   struct v4l2_fmtdesc *f)
+{
+        return enum_fmt(f, MEM2MEM_CAPTURE);
+}
+
+static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
+                                   struct v4l2_fmtdesc *f)
+{
+        return enum_fmt(f, MEM2MEM_OUTPUT);
+}
+
+static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
+{
+        struct vb2_queue *vq;
+        struct m2mtest_q_data *q_data;
+
+        vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
+        if (!vq)
+                return -EINVAL;
+
+        q_data = get_q_data(ctx, f->type);
+
+        f->fmt.pix.width        = q_data->width;
+        f->fmt.pix.height       = q_data->height;
+        f->fmt.pix.field        = V4L2_FIELD_NONE;
+        f->fmt.pix.pixelformat  = q_data->fmt->fourcc;
+        f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
+        f->fmt.pix.sizeimage    = q_data->sizeimage;
+        f->fmt.pix.colorspace   = ctx->colorspace;
+
+        return 0;
+}
+
+static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
+                                struct v4l2_format *f)
+{
+        return vidioc_g_fmt(file2ctx(file), f);
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+                                struct v4l2_format *f)
+{
+        return vidioc_g_fmt(file2ctx(file), f);
+}
+
+static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt)
+{
+        enum v4l2_field field;
+
+        field = f->fmt.pix.field;
+
+        if (field == V4L2_FIELD_ANY)
+                field = V4L2_FIELD_NONE;
+        else if (V4L2_FIELD_NONE != field)
+                return -EINVAL;
+
+        /* V4L2 specification suggests the driver corrects the format struct
+         * if any of the dimensions is unsupported */
+        f->fmt.pix.field = field;
+
+        if (f->fmt.pix.height < MIN_H)
+                f->fmt.pix.height = MIN_H;
+        else if (f->fmt.pix.height > MAX_H)
+                f->fmt.pix.height = MAX_H;
+
+        if (f->fmt.pix.width < MIN_W)
+                f->fmt.pix.width = MIN_W;
+        else if (f->fmt.pix.width > MAX_W)
+                f->fmt.pix.width = MAX_W;
+
+        f->fmt.pix.width &= ~DIM_ALIGN_MASK;
+        f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
+        f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+
+        return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+                                  struct v4l2_format *f)
+{
+        struct m2mtest_fmt *fmt;
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        fmt = find_format(f);
+        if (!fmt || !(fmt->types & MEM2MEM_CAPTURE)) {
+                v4l2_err(&ctx->dev->v4l2_dev,
+                         "Fourcc format (0x%08x) invalid.\n",
+                         f->fmt.pix.pixelformat);
+                return -EINVAL;
+        }
+        f->fmt.pix.colorspace = ctx->colorspace;
+
+        return vidioc_try_fmt(f, fmt);
+}
+
+static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
+                                  struct v4l2_format *f)
+{
+        struct m2mtest_fmt *fmt;
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        fmt = find_format(f);
+        if (!fmt || !(fmt->types & MEM2MEM_OUTPUT)) {
+                v4l2_err(&ctx->dev->v4l2_dev,
+                         "Fourcc format (0x%08x) invalid.\n",
+                         f->fmt.pix.pixelformat);
+                return -EINVAL;
+        }
+        if (!f->fmt.pix.colorspace)
+                f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
+
+        return vidioc_try_fmt(f, fmt);
+}
+
+static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
+{
+        struct m2mtest_q_data *q_data;
+        struct vb2_queue *vq;
+
+        vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
+        if (!vq)
+                return -EINVAL;
+
+        q_data = get_q_data(ctx, f->type);
+        if (!q_data)
+                return -EINVAL;
+
+        if (vb2_is_busy(vq)) {
+                v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
+                return -EBUSY;
+        }
+
+        q_data->fmt             = find_format(f);
+        q_data->width           = f->fmt.pix.width;
+        q_data->height          = f->fmt.pix.height;
+        q_data->sizeimage       = q_data->width * q_data->height
+                                * q_data->fmt->depth >> 3;
+
+        dprintk(ctx->dev,
+                "Setting format for type %d, wxh: %dx%d, fmt: %d\n",
+                f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
+
+        return 0;
+}
+
+static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
+                                struct v4l2_format *f)
+{
+        int ret;
+
+        ret = vidioc_try_fmt_vid_cap(file, priv, f);
+        if (ret)
+                return ret;
+
+        return vidioc_s_fmt(file2ctx(file), f);
+}
+
+static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
+                                struct v4l2_format *f)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+        int ret;
+
+        ret = vidioc_try_fmt_vid_out(file, priv, f);
+        if (ret)
+                return ret;
+
+        ret = vidioc_s_fmt(file2ctx(file), f);
+        if (!ret)
+                ctx->colorspace = f->fmt.pix.colorspace;
+        return ret;
+}
+
+static int vidioc_reqbufs(struct file *file, void *priv,
+                          struct v4l2_requestbuffers *reqbufs)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
+}
+
+static int vidioc_querybuf(struct file *file, void *priv,
+                           struct v4l2_buffer *buf)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_streamon(struct file *file, void *priv,
+                           enum v4l2_buf_type type)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
+}
+
+static int vidioc_streamoff(struct file *file, void *priv,
+                            enum v4l2_buf_type type)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
+}
+
+static int m2mtest_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+        struct m2mtest_ctx *ctx =
+                container_of(ctrl->handler, struct m2mtest_ctx, hdl);
+
+        switch (ctrl->id) {
+        case V4L2_CID_HFLIP:
+                if (ctrl->val)
+                        ctx->mode |= MEM2MEM_HFLIP;
+                else
+                        ctx->mode &= ~MEM2MEM_HFLIP;
+                break;
+
+        case V4L2_CID_VFLIP:
+                if (ctrl->val)
+                        ctx->mode |= MEM2MEM_VFLIP;
+                else
+                        ctx->mode &= ~MEM2MEM_VFLIP;
+                break;
+
+        case V4L2_CID_TRANS_TIME_MSEC:
+                ctx->transtime = ctrl->val;
+                break;
+
+        case V4L2_CID_TRANS_NUM_BUFS:
+                ctx->translen = ctrl->val;
+                break;
+
+        default:
+                v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static const struct v4l2_ctrl_ops m2mtest_ctrl_ops = {
+        .s_ctrl = m2mtest_s_ctrl,
+};
+
+
+static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = {
+        .vidioc_querycap        = vidioc_querycap,
+
+        .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
+        .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
+        .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
+        .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
+
+        .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
+        .vidioc_g_fmt_vid_out   = vidioc_g_fmt_vid_out,
+        .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out,
+        .vidioc_s_fmt_vid_out   = vidioc_s_fmt_vid_out,
+
+        .vidioc_reqbufs         = vidioc_reqbufs,
+        .vidioc_querybuf        = vidioc_querybuf,
+
+        .vidioc_qbuf            = vidioc_qbuf,
+        .vidioc_dqbuf           = vidioc_dqbuf,
+
+        .vidioc_streamon        = vidioc_streamon,
+        .vidioc_streamoff       = vidioc_streamoff,
+        .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+
+/*
+ * Queue operations
+ */
+
+static int m2mtest_queue_setup(struct vb2_queue *vq,
+                                const struct v4l2_format *fmt,
+                                unsigned int *nbuffers, unsigned int *nplanes,
+                                unsigned int sizes[], void *alloc_ctxs[])
+{
+        struct m2mtest_ctx *ctx = vb2_get_drv_priv(vq);
+        struct m2mtest_q_data *q_data;
+        unsigned int size, count = *nbuffers;
+
+        q_data = get_q_data(ctx, vq->type);
+
+        size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
+
+        while (size * count > MEM2MEM_VID_MEM_LIMIT)
+                (count)--;
+
+        *nplanes = 1;
+        *nbuffers = count;
+        sizes[0] = size;
+
+        /*
+         * videobuf2-vmalloc allocator is context-less so no need to set
+         * alloc_ctxs array.
+         */
+
+        dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);
+
+        return 0;
+}
+
+static int m2mtest_buf_prepare(struct vb2_buffer *vb)
+{
+        struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+        struct m2mtest_q_data *q_data;
+
+        dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);
+
+        q_data = get_q_data(ctx, vb->vb2_queue->type);
+
+        if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
+                dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
+                                __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
+                return -EINVAL;
+        }
+
+        vb2_set_plane_payload(vb, 0, q_data->sizeimage);
+
+        return 0;
+}
+
+static void m2mtest_buf_queue(struct vb2_buffer *vb)
+{
+        struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+        v4l2_m2m_buf_queue(ctx->m2m_ctx, vb);
+}
+
+static void m2mtest_wait_prepare(struct vb2_queue *q)
+{
+        struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
+        m2mtest_unlock(ctx);
+}
+
+static void m2mtest_wait_finish(struct vb2_queue *q)
+{
+        struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
+        m2mtest_lock(ctx);
+}
+
+static struct vb2_ops m2mtest_qops = {
+        .queue_setup     = m2mtest_queue_setup,
+        .buf_prepare     = m2mtest_buf_prepare,
+        .buf_queue       = m2mtest_buf_queue,
+        .wait_prepare    = m2mtest_wait_prepare,
+        .wait_finish     = m2mtest_wait_finish,
+};
+
+static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
+{
+        struct m2mtest_ctx *ctx = priv;
+        int ret;
+
+        memset(src_vq, 0, sizeof(*src_vq));
+        src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+        src_vq->io_modes = VB2_MMAP;
+        src_vq->drv_priv = ctx;
+        src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+        src_vq->ops = &m2mtest_qops;
+        src_vq->mem_ops = &vb2_vmalloc_memops;
+
+        ret = vb2_queue_init(src_vq);
+        if (ret)
+                return ret;
+
+        memset(dst_vq, 0, sizeof(*dst_vq));
+        dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+        dst_vq->io_modes = VB2_MMAP;
+        dst_vq->drv_priv = ctx;
+        dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+        dst_vq->ops = &m2mtest_qops;
+        dst_vq->mem_ops = &vb2_vmalloc_memops;
+
+        return vb2_queue_init(dst_vq);
+}
+
+static const struct v4l2_ctrl_config m2mtest_ctrl_trans_time_msec = {
+        .ops = &m2mtest_ctrl_ops,
+        .id = V4L2_CID_TRANS_TIME_MSEC,
+        .name = "Transaction Time (msec)",
+        .type = V4L2_CTRL_TYPE_INTEGER,
+        .def = 1001,
+        .min = 1,
+        .max = 10001,
+        .step = 100,
+};
+
+static const struct v4l2_ctrl_config m2mtest_ctrl_trans_num_bufs = {
+        .ops = &m2mtest_ctrl_ops,
+        .id = V4L2_CID_TRANS_NUM_BUFS,
+        .name = "Buffers Per Transaction",
+        .type = V4L2_CTRL_TYPE_INTEGER,
+        .def = 1,
+        .min = 1,
+        .max = MEM2MEM_DEF_NUM_BUFS,
+        .step = 1,
+};
+
+/*
+ * File operations
+ */
+static int m2mtest_open(struct file *file)
+{
+        struct m2mtest_dev *dev = video_drvdata(file);
+        struct m2mtest_ctx *ctx = NULL;
+        struct v4l2_ctrl_handler *hdl;
+        int rc = 0;
+
+        if (mutex_lock_interruptible(&dev->dev_mutex))
+                return -ERESTARTSYS;
+        ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
+        if (!ctx) {
+                rc = -ENOMEM;
+                goto open_unlock;
+        }
+
+        v4l2_fh_init(&ctx->fh, video_devdata(file));
+        file->private_data = &ctx->fh;
+        ctx->dev = dev;
+        hdl = &ctx->hdl;
+        v4l2_ctrl_handler_init(hdl, 4);
+        v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
+        v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
+        v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_time_msec, NULL);
+        v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_num_bufs, NULL);
+        if (hdl->error) {
+                int err = hdl->error;
+
+                v4l2_ctrl_handler_free(hdl);
+                return err;
+        }
+        ctx->fh.ctrl_handler = hdl;
+        v4l2_ctrl_handler_setup(hdl);
+
+        ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0];
+        ctx->q_data[V4L2_M2M_SRC].width = 640;
+        ctx->q_data[V4L2_M2M_SRC].height = 480;
+        ctx->q_data[V4L2_M2M_SRC].sizeimage =
+                ctx->q_data[V4L2_M2M_SRC].width *
+                ctx->q_data[V4L2_M2M_SRC].height *
+                (ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3);
+        ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
+        ctx->colorspace = V4L2_COLORSPACE_REC709;
+
+        ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
+
+        if (IS_ERR(ctx->m2m_ctx)) {
+                rc = PTR_ERR(ctx->m2m_ctx);
+
+                v4l2_ctrl_handler_free(hdl);
+                kfree(ctx);
+                goto open_unlock;
+        }
+
+        v4l2_fh_add(&ctx->fh);
+        atomic_inc(&dev->num_inst);
+
+        dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);
+
+open_unlock:
+        mutex_unlock(&dev->dev_mutex);
+        return 0;
+}
+
+static int m2mtest_release(struct file *file)
+{
+        struct m2mtest_dev *dev = video_drvdata(file);
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        dprintk(dev, "Releasing instance %p\n", ctx);
+
+        v4l2_fh_del(&ctx->fh);
+        v4l2_fh_exit(&ctx->fh);
+        v4l2_ctrl_handler_free(&ctx->hdl);
+        mutex_lock(&dev->dev_mutex);
+        v4l2_m2m_ctx_release(ctx->m2m_ctx);
+        mutex_unlock(&dev->dev_mutex);
+        kfree(ctx);
+
+        atomic_dec(&dev->num_inst);
+
+        return 0;
+}
+
+static unsigned int m2mtest_poll(struct file *file,
+                                 struct poll_table_struct *wait)
+{
+        struct m2mtest_ctx *ctx = file2ctx(file);
+
+        return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
+}
+
+static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma)
+{
+        struct m2mtest_dev *dev = video_drvdata(file);
+        struct m2mtest_ctx *ctx = file2ctx(file);
+        int res;
+
+        if (mutex_lock_interruptible(&dev->dev_mutex))
+                return -ERESTARTSYS;
+        res = v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
+        mutex_unlock(&dev->dev_mutex);
+        return res;
+}
+
+static const struct v4l2_file_operations m2mtest_fops = {
+        .owner          = THIS_MODULE,
+        .open           = m2mtest_open,
+        .release        = m2mtest_release,
+        .poll           = m2mtest_poll,
+        .unlocked_ioctl = video_ioctl2,
+        .mmap           = m2mtest_mmap,
+};
+
+static struct video_device m2mtest_videodev = {
+        .name           = MEM2MEM_NAME,
+        .fops           = &m2mtest_fops,
+        .ioctl_ops      = &m2mtest_ioctl_ops,
+        .minor          = -1,
+        .release        = video_device_release,
+};
+
+static struct v4l2_m2m_ops m2m_ops = {
+        .device_run     = device_run,
+        .job_ready      = job_ready,
+        .job_abort      = job_abort,
+        .lock           = m2mtest_lock,
+        .unlock         = m2mtest_unlock,
+};
+
+static int m2mtest_probe(struct platform_device *pdev)
+{
+        struct m2mtest_dev *dev;
+        struct video_device *vfd;
+        int ret;
+
+        dev = kzalloc(sizeof *dev, GFP_KERNEL);
+        if (!dev)
+                return -ENOMEM;
+
+        spin_lock_init(&dev->irqlock);
+
+        ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
+        if (ret)
+                goto free_dev;
+
+        atomic_set(&dev->num_inst, 0);
+        mutex_init(&dev->dev_mutex);
+
+        vfd = video_device_alloc();
+        if (!vfd) {
+                v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
+                ret = -ENOMEM;
+                goto unreg_dev;
+        }
+
+        *vfd = m2mtest_videodev;
+        vfd->lock = &dev->dev_mutex;
+
+        ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
+        if (ret) {
+                v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
+                goto rel_vdev;
+        }
+
+        video_set_drvdata(vfd, dev);
+        snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name);
+        dev->vfd = vfd;
+        v4l2_info(&dev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME
+                        "Device registered as /dev/video%d\n", vfd->num);
+
+        setup_timer(&dev->timer, device_isr, (long)dev);
+        platform_set_drvdata(pdev, dev);
+
+        dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
+        if (IS_ERR(dev->m2m_dev)) {
+                v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
+                ret = PTR_ERR(dev->m2m_dev);
+                goto err_m2m;
+        }
+
+        return 0;
+
+        v4l2_m2m_release(dev->m2m_dev);
+err_m2m:
+        video_unregister_device(dev->vfd);
+rel_vdev:
+        video_device_release(vfd);
+unreg_dev:
+        v4l2_device_unregister(&dev->v4l2_dev);
+free_dev:
+        kfree(dev);
+
+        return ret;
+}
+
+static int m2mtest_remove(struct platform_device *pdev)
+{
+        struct m2mtest_dev *dev =
+                (struct m2mtest_dev *)platform_get_drvdata(pdev);
+
+        v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME);
+        v4l2_m2m_release(dev->m2m_dev);
+        del_timer_sync(&dev->timer);
+        video_unregister_device(dev->vfd);
+        v4l2_device_unregister(&dev->v4l2_dev);
+        kfree(dev);
+
+        return 0;
+}
+
+static struct platform_driver m2mtest_pdrv = {
+        .probe          = m2mtest_probe,
+        .remove         = m2mtest_remove,
+        .driver         = {
+                .name   = MEM2MEM_NAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+static void __exit m2mtest_exit(void)
+{
+        platform_driver_unregister(&m2mtest_pdrv);
+        platform_device_unregister(&m2mtest_pdev);
+}
+
+static int __init m2mtest_init(void)
+{
+        int ret;
+
+        ret = platform_device_register(&m2mtest_pdev);
+        if (ret)
+                return ret;
+
+        ret = platform_driver_register(&m2mtest_pdrv);
+        if (ret)
+                platform_device_unregister(&m2mtest_pdev);
+
+        return 0;
+}
+
+module_init(m2mtest_init);
+module_exit(m2mtest_exit);
+