[PATCH v2 2/2] V4L: Add a mem-to-mem V4L2 framework test device.
Pawel Osciak
p.osciak at samsung.com
Wed Dec 23 05:07:33 EST 2009
This is a virtual device driver for testing the mem-to-mem V4L2 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).
Signed-off-by: Pawel Osciak <p.osciak at samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park at samsung.com>
---
drivers/media/video/Kconfig | 10 +
drivers/media/video/Makefile | 1 +
drivers/media/video/mem2mem_testdev.c | 1052 +++++++++++++++++++++++++++++++++
3 files changed, 1063 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/mem2mem_testdev.c
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index caefd7b..6fe4b53 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -1090,4 +1090,14 @@ menuconfig V4L_MEM2MEM_DRIVERS
to capture and output drivers, which use memory buffers for just
one of those.
+config VIDEO_MEM2MEM_TESTDEV
+ tristate "Virtual test device for mem2mem framework"
+ depends on VIDEO_DEV && VIDEO_V4L2
+ select VIDEOBUF_VMALLOC
+ select V4L2_MEM2MEM_DEV
+ default n
+ ---help---
+ This is a virtual test device for the memory-to-memory driver
+ framework.
+
endif # V4L_MEM2MEM_DRIVERS
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index 9fe7d40..8667f1c 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -149,6 +149,7 @@ obj-$(CONFIG_VIDEO_IVTV) += ivtv/
obj-$(CONFIG_VIDEO_CX18) += cx18/
obj-$(CONFIG_VIDEO_VIVI) += vivi.o
+obj-$(CONFIG_VIDEO_MEM2MEM_TESTDEV) += mem2mem_testdev.o
obj-$(CONFIG_VIDEO_CX23885) += cx23885/
obj-$(CONFIG_VIDEO_OMAP2) += omap2cam.o
diff --git a/drivers/media/video/mem2mem_testdev.c b/drivers/media/video/mem2mem_testdev.c
new file mode 100644
index 0000000..ea54a68
--- /dev/null
+++ b/drivers/media/video/mem2mem_testdev.c
@@ -0,0 +1,1052 @@
+/*
+ * A virtual v4l2-mem2mem example device.
+ *
+ * This is a virtual device driver for testing the mem-to-mem V4L2 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 Samsung Electronics Co., Ltd.
+ * Pawel Osciak, <p.osciak at samsung.com>
+ * Marek Szyprowski, <m.szyprowski at 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/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 at 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_MAX_INSTANCES 10
+#define MEM2MEM_NAME "m2m-testdev"
+
+/* Per queue */
+#define MEM2MEM_DEF_NUM_BUFS 32
+/* 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 10
+
+#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; /* v4l2 format id */
+ 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 miliseconds */
+ 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_vmalloc(src_q, &in_buf->vb);
+ p_out = videobuf_queue_to_vmalloc(dst_q, &out_buf->vb);
+ if (!p_in || !p_out) {
+ v4l2_err(&dev->v4l2_dev,
+ "Acquiring kernel pointers to buffers failed\n");
+ return 1;
+ }
+
+ if (in_buf->vb.size < out_buf->vb.size) {
+ v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
+ return 1;
+ }
+
+ 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 fake 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 should be called by the framework when it devides 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;
+
+ curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev);
+
+ if (NULL == curr_ctx) {
+ printk(KERN_ERR
+ "Instance released before 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;
+ v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx);
+ src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE;
+ wake_up(&src_buf->vb.done);
+ wake_up(&dst_buf->vb.done);
+ } else {
+ src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE;
+ wake_up(&src_buf->vb.done);
+ wake_up(&dst_buf->vb.done);
+ device_run(curr_ctx);
+ }
+
+ return;
+}
+
+
+/*
+ * 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);
+ 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);
+ 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 (%d < %d)\n",
+ q_data->sizeimage, vb->bsize);
+ return -EINVAL;
+ }
+ } else if (vb->state != VIDEOBUF_NEEDS_INIT
+ && vb->bsize < q_data->sizeimage) {
+ /* We provide the buffer, but it's already been inited
+ * 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;
+
+ atomic_inc(&dev->num_inst);
+
+ ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
+ if (!ctx) {
+ atomic_dec(&dev->num_inst);
+ 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)) {
+ kfree(ctx);
+ atomic_dec(&dev->num_inst);
+ return PTR_ERR(ctx->m2m_ctx);
+ }
+
+ 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");
+ 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);
+
--
1.6.4.2.253.g0b1fac
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