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linux-sg2042/drivers/media/platform/mem2mem_testdev.c

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/*
* 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");
static unsigned debug;
module_param(debug, uint, 0644);
MODULE_PARM_DESC(debug, "activates debug info");
#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, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
static 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;
memcpy(&out_vb->v4l2_buf.timestamp,
&in_vb->v4l2_buf.timestamp,
sizeof(struct timeval));
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) {
pr_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);
snprintf(cap->bus_info, sizeof(cap->bus_info),
"platform:%s", MEM2MEM_NAME);
cap->device_caps = 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;
src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
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;
src_vq->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_COPY;
ret = vb2_queue_init(src_vq);
if (ret)
return ret;
dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
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;
dst_vq->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_COPY;
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) {
rc = hdl->error;
v4l2_ctrl_handler_free(hdl);
goto open_unlock;
}
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 rc;
}
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,
.vfl_dir = VFL_DIR_M2M,
.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 = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
spin_lock_init(&dev->irqlock);
ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
if (ret)
return ret;
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;
vfd->v4l2_dev = &dev->v4l2_dev;
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,
"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;
err_m2m:
v4l2_m2m_release(dev->m2m_dev);
video_unregister_device(dev->vfd);
rel_vdev:
video_device_release(vfd);
unreg_dev:
v4l2_device_unregister(&dev->v4l2_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);
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);
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