/*
* 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, <p.osciak@samsung.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/version.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/videobuf-vmalloc.h>
#define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev"
MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
MODULE_AUTHOR("Pawel Osciak, <p.osciak@samsung.com>");
MODULE_LICENSE("GPL");
#define MIN_W 32
#define MIN_H 32
#define MAX_W 640
#define MAX_H 480
#define DIM_ALIGN_MASK 0x08 /* 8-alignment for dimensions */
/* 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,
};
/* Source and destination queue data */
static struct m2mtest_q_data q_data[2];
static struct m2mtest_q_data *get_q_data(enum v4l2_buf_type type)
{
switch (type) {
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
return &q_data[V4L2_M2M_SRC];
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
return &q_data[V4L2_M2M_DST];
default:
BUG();
}
return NULL;
}
#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;
};
struct m2mtest_buffer {
/* vb must be first! */
struct videobuf_buffer vb;
};
static struct v4l2_queryctrl *get_ctrl(int id)
{
int i;
for (i = 0; i < ARRAY_SIZE(m2mtest_ctrls); ++i) {
if (id == m2mtest_ctrls[i].id)
return &m2mtest_ctrls[i];
}
return NULL;
}
static int device_process(struct m2mtest_ctx *ctx,
struct m2mtest_buffer *in_buf,
struct m2mtest_buffer *out_buf)
{
struct m2mtest_dev *dev = ctx->dev;
u8 *p_in, *p_out;
int x, y, t, w;
int tile_w, bytes_left;
struct videobuf_queue *src_q;
struct videobuf_queue *dst_q;
src_q = v4l2_m2m_get_src_vq(ctx->m2m_ctx);
dst_q = v4l2_m2m_get_dst_vq(ctx->m2m_ctx);
p_in = videobuf_queue_to_vaddr(src_q, &in_buf->vb);
p_out = videobuf_queue_to_vaddr(dst_q, &out_buf->vb);
if (!p_in || !p_out) {
v4l2_err(&dev->v4l2_dev,
"Acquiring kernel pointers to buffers failed\n");
return -EFAULT;
}
if (in_buf->vb.size < out_buf->vb.size) {
v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
return -EINVAL;
}
tile_w = (in_buf->vb.width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
/ MEM2MEM_NUM_TILES;
bytes_left = in_buf->vb.bytesperline - tile_w * MEM2MEM_NUM_TILES;
w = 0;
for (y = 0; y < in_buf->vb.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;
}
/* 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 m2mtest_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 m2mtest_buffer *src_buf, *dst_buf;
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_buf = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx);
dst_buf = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx);
curr_ctx->num_processed++;
if (curr_ctx->num_processed == curr_ctx->translen
|| curr_ctx->aborting) {
dprintk(curr_ctx->dev, "Finishing transaction\n");
curr_ctx->num_processed = 0;
spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE;
wake_up(&src_buf->vb.done);
wake_up(&dst_buf->vb.done);
spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx);
} else {
spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE;
wake_up(&src_buf->vb.done);
wake_up(&dst_buf->vb.done);
spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
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);
cap->bus_info[0] = 0;
cap->version = KERNEL_VERSION(0, 1, 0);
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
| V4L2_CAP_STREAMING;
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 videobuf_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(f->type);
f->fmt.pix.width = q_data->width;
f->fmt.pix.height = q_data->height;
f->fmt.pix.field = vq->field;
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;
return 0;
}
static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
struct v4l2_format *f)
{
return vidioc_g_fmt(priv, f);
}
static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
return vidioc_g_fmt(priv, 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 = priv;
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;
}
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 = priv;
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;
}
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 videobuf_queue *vq;
int ret = 0;
vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
if (!vq)
return -EINVAL;
q_data = get_q_data(f->type);
if (!q_data)
return -EINVAL;
mutex_lock(&vq->vb_lock);
if (videobuf_queue_is_busy(vq)) {
v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
ret = -EBUSY;
goto out;
}
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;
vq->field = f->fmt.pix.field;
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);
out:
mutex_unlock(&vq->vb_lock);
return ret;
}
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(priv, f);
}
static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
struct v4l2_format *f)
{
int ret;
ret = vidioc_try_fmt_vid_out(file, priv, f);
if (ret)
return ret;
return vidioc_s_fmt(priv, f);
}
static int vidioc_reqbufs(struct file *file, void *priv,
struct v4l2_requestbuffers *reqbufs)
{
struct m2mtest_ctx *ctx = priv;
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 = priv;
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 = priv;
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 = priv;
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 = priv;
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 = priv;
return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
}
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
struct v4l2_queryctrl *c;
c = get_ctrl(qc->id);
if (!c)
return -EINVAL;
*qc = *c;
return 0;
}
static int vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct m2mtest_ctx *ctx = priv;
switch (ctrl->id) {
case V4L2_CID_TRANS_TIME_MSEC:
ctrl->value = ctx->transtime;
break;
case V4L2_CID_TRANS_NUM_BUFS:
ctrl->value = ctx->translen;
break;
default:
v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
return -EINVAL;
}
return 0;
}
static int check_ctrl_val(struct m2mtest_ctx *ctx, struct v4l2_control *ctrl)
{
struct v4l2_queryctrl *c;
c = get_ctrl(ctrl->id);
if (!c)
return -EINVAL;
if (ctrl->value < c->minimum || ctrl->value > c->maximum) {
v4l2_err(&ctx->dev->v4l2_dev, "Value out of range\n");
return -ERANGE;
}
return 0;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct m2mtest_ctx *ctx = priv;
int ret = 0;
ret = check_ctrl_val(ctx, ctrl);
if (ret != 0)
return ret;
switch (ctrl->id) {
case V4L2_CID_TRANS_TIME_MSEC:
ctx->transtime = ctrl->value;
break;
case V4L2_CID_TRANS_NUM_BUFS:
ctx->translen = ctrl->value;
break;
default:
v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
return -EINVAL;
}
return 0;
}
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_queryctrl = vidioc_queryctrl,
.vidioc_g_ctrl = vidioc_g_ctrl,
.vidioc_s_ctrl = vidioc_s_ctrl,
};
/*
* Queue operations
*/
static void m2mtest_buf_release(struct videobuf_queue *vq,
struct videobuf_buffer *vb)
{
struct m2mtest_ctx *ctx = vq->priv_data;
dprintk(ctx->dev, "type: %d, index: %d, state: %d\n",
vq->type, vb->i, vb->state);
videobuf_vmalloc_free(vb);
vb->state = VIDEOBUF_NEEDS_INIT;
}
static int m2mtest_buf_setup(struct videobuf_queue *vq, unsigned int *count,
unsigned int *size)
{
struct m2mtest_ctx *ctx = vq->priv_data;
struct m2mtest_q_data *q_data;
q_data = get_q_data(vq->type);
*size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
dprintk(ctx->dev, "size:%d, w/h %d/%d, depth: %d\n",
*size, q_data->width, q_data->height, q_data->fmt->depth);
if (0 == *count)
*count = MEM2MEM_DEF_NUM_BUFS;
while (*size * *count > MEM2MEM_VID_MEM_LIMIT)
(*count)--;
v4l2_info(&ctx->dev->v4l2_dev,
"%d buffers of size %d set up.\n", *count, *size);
return 0;
}
static int m2mtest_buf_prepare(struct videobuf_queue *vq,
struct videobuf_buffer *vb,
enum v4l2_field field)
{
struct m2mtest_ctx *ctx = vq->priv_data;
struct m2mtest_q_data *q_data;
int ret;
dprintk(ctx->dev, "type: %d, index: %d, state: %d\n",
vq->type, vb->i, vb->state);
q_data = get_q_data(vq->type);
if (vb->baddr) {
/* User-provided buffer */
if (vb->bsize < q_data->sizeimage) {
/* Buffer too small to fit a frame */
v4l2_err(&ctx->dev->v4l2_dev,
"User-provided buffer too small\n");
return -EINVAL;
}
} else if (vb->state != VIDEOBUF_NEEDS_INIT
&& vb->bsize < q_data->sizeimage) {
/* We provide the buffer, but it's already been initialized
* and is too small */
return -EINVAL;
}
vb->width = q_data->width;
vb->height = q_data->height;
vb->bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
vb->size = q_data->sizeimage;
vb->field = field;
if (VIDEOBUF_NEEDS_INIT == vb->state) {
ret = videobuf_iolock(vq, vb, NULL);
if (ret) {
v4l2_err(&ctx->dev->v4l2_dev,
"Iolock failed\n");
goto fail;
}
}
vb->state = VIDEOBUF_PREPARED;
return 0;
fail:
m2mtest_buf_release(vq, vb);
return ret;
}
static void m2mtest_buf_queue(struct videobuf_queue *vq,
struct videobuf_buffer *vb)
{
struct m2mtest_ctx *ctx = vq->priv_data;
v4l2_m2m_buf_queue(ctx->m2m_ctx, vq, vb);
}
static struct videobuf_queue_ops m2mtest_qops = {
.buf_setup = m2mtest_buf_setup,
.buf_prepare = m2mtest_buf_prepare,
.buf_queue = m2mtest_buf_queue,
.buf_release = m2mtest_buf_release,
};
static void queue_init(void *priv, struct videobuf_queue *vq,
enum v4l2_buf_type type)
{
struct m2mtest_ctx *ctx = priv;
videobuf_queue_vmalloc_init(vq, &m2mtest_qops, ctx->dev->v4l2_dev.dev,
&ctx->dev->irqlock, type, V4L2_FIELD_NONE,
sizeof(struct m2mtest_buffer), priv);
}
/*
* File operations
*/
static int m2mtest_open(struct file *file)
{
struct m2mtest_dev *dev = video_drvdata(file);
struct m2mtest_ctx *ctx = NULL;
ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
if (!ctx)
return -ENOMEM;
file->private_data = ctx;
ctx->dev = dev;
ctx->translen = MEM2MEM_DEF_TRANSLEN;
ctx->transtime = MEM2MEM_DEF_TRANSTIME;
ctx->num_processed = 0;
ctx->m2m_ctx = v4l2_m2m_ctx_init(ctx, dev->m2m_dev, queue_init);
if (IS_ERR(ctx->m2m_ctx)) {
int ret = PTR_ERR(ctx->m2m_ctx);
kfree(ctx);
return ret;
}
atomic_inc(&dev->num_inst);
dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);
return 0;
}
static int m2mtest_release(struct file *file)
{
struct m2mtest_dev *dev = video_drvdata(file);
struct m2mtest_ctx *ctx = file->private_data;
dprintk(dev, "Releasing instance %p\n", ctx);
v4l2_m2m_ctx_release(ctx->m2m_ctx);
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 = (struct m2mtest_ctx *)file->private_data;
return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
}
static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma)
{
struct m2mtest_ctx *ctx = (struct m2mtest_ctx *)file->private_data;
return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
}
static const struct v4l2_file_operations m2mtest_fops = {
.owner = THIS_MODULE,
.open = m2mtest_open,
.release = m2mtest_release,
.poll = m2mtest_poll,
.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,
};
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;
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;
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);