--- /dev/null
+/*
+ * 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>
+
+MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
+MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1.1");
+MODULE_ALIAS("mem2mem_testdev");
+
+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 "vim2m"
+
+/* 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 40
+#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 vim2m_dev_release(struct device *dev)
+{}
+
+static struct platform_device vim2m_pdev = {
+ .name = MEM2MEM_NAME,
+ .dev.release = vim2m_dev_release,
+};
+
+struct vim2m_fmt {
+ char *name;
+ u32 fourcc;
+ int depth;
+ /* Types the format can be used for */
+ u32 types;
+};
+
+static struct vim2m_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 vim2m_q_data {
+ unsigned int width;
+ unsigned int height;
+ unsigned int sizeimage;
+ unsigned int sequence;
+ struct vim2m_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 vim2m_fmt *find_format(struct v4l2_format *f)
+{
+ struct vim2m_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 vim2m_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 vim2m_ctx {
+ struct v4l2_fh fh;
+ struct vim2m_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;
+
+ /* Source and destination queue data */
+ struct vim2m_q_data q_data[2];
+};
+
+static inline struct vim2m_ctx *file2ctx(struct file *file)
+{
+ return container_of(file->private_data, struct vim2m_ctx, fh);
+}
+
+static struct vim2m_q_data *get_q_data(struct vim2m_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 vim2m_ctx *ctx,
+ struct vb2_buffer *in_vb,
+ struct vb2_buffer *out_vb)
+{
+ struct vim2m_dev *dev = ctx->dev;
+ struct vim2m_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;
+
+ out_vb->v4l2_buf.sequence = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE)->sequence++;
+ in_vb->v4l2_buf.sequence = q_data->sequence++;
+ memcpy(&out_vb->v4l2_buf.timestamp,
+ &in_vb->v4l2_buf.timestamp,
+ sizeof(struct timeval));
+ if (in_vb->v4l2_buf.flags & V4L2_BUF_FLAG_TIMECODE)
+ memcpy(&out_vb->v4l2_buf.timecode, &in_vb->v4l2_buf.timecode,
+ sizeof(struct v4l2_timecode));
+ out_vb->v4l2_buf.field = in_vb->v4l2_buf.field;
+ out_vb->v4l2_buf.flags = in_vb->v4l2_buf.flags &
+ (V4L2_BUF_FLAG_TIMECODE |
+ V4L2_BUF_FLAG_KEYFRAME |
+ V4L2_BUF_FLAG_PFRAME |
+ V4L2_BUF_FLAG_BFRAME |
+ V4L2_BUF_FLAG_TSTAMP_SRC_MASK);
+
+ 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 vim2m_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 vim2m_ctx *ctx = priv;
+
+ if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen
+ || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) {
+ dprintk(ctx->dev, "Not enough buffers available\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static void job_abort(void *priv)
+{
+ struct vim2m_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 vim2m_ctx *ctx = priv;
+ struct vim2m_dev *dev = ctx->dev;
+ struct vb2_buffer *src_buf, *dst_buf;
+
+ src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
+ dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.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 vim2m_dev *vim2m_dev = (struct vim2m_dev *)priv;
+ struct vim2m_ctx *curr_ctx;
+ struct vb2_buffer *src_vb, *dst_vb;
+ unsigned long flags;
+
+ curr_ctx = v4l2_m2m_get_curr_priv(vim2m_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->fh.m2m_ctx);
+ dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
+
+ curr_ctx->num_processed++;
+
+ spin_lock_irqsave(&vim2m_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(&vim2m_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(vim2m_dev->m2m_dev, curr_ctx->fh.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 vim2m_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 vim2m_ctx *ctx, struct v4l2_format *f)
+{
+ struct vb2_queue *vq;
+ struct vim2m_q_data *q_data;
+
+ vq = v4l2_m2m_get_vq(ctx->fh.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 vim2m_fmt *fmt)
+{
+ /* V4L2 specification suggests the driver corrects the format struct
+ * if any of the dimensions is unsupported */
+ 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;
+ f->fmt.pix.field = V4L2_FIELD_NONE;
+
+ return 0;
+}
+
+static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ struct vim2m_fmt *fmt;
+ struct vim2m_ctx *ctx = file2ctx(file);
+
+ fmt = find_format(f);
+ if (!fmt) {
+ f->fmt.pix.pixelformat = formats[0].fourcc;
+ fmt = find_format(f);
+ }
+ if (!(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 vim2m_fmt *fmt;
+ struct vim2m_ctx *ctx = file2ctx(file);
+
+ fmt = find_format(f);
+ if (!fmt) {
+ f->fmt.pix.pixelformat = formats[0].fourcc;
+ fmt = find_format(f);
+ }
+ if (!(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 vim2m_ctx *ctx, struct v4l2_format *f)
+{
+ struct vim2m_q_data *q_data;
+ struct vb2_queue *vq;
+
+ vq = v4l2_m2m_get_vq(ctx->fh.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 vim2m_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 vim2m_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct vim2m_ctx *ctx =
+ container_of(ctrl->handler, struct vim2m_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 vim2m_ctrl_ops = {
+ .s_ctrl = vim2m_s_ctrl,
+};
+
+
+static const struct v4l2_ioctl_ops vim2m_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 = v4l2_m2m_ioctl_reqbufs,
+ .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
+ .vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
+ .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
+ .vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
+
+ .vidioc_streamon = v4l2_m2m_ioctl_streamon,
+ .vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
+
+ .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
+ .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+
+/*
+ * Queue operations
+ */
+
+static int vim2m_queue_setup(struct vb2_queue *vq,
+ const struct v4l2_format *fmt,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct vim2m_ctx *ctx = vb2_get_drv_priv(vq);
+ struct vim2m_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 vim2m_buf_prepare(struct vb2_buffer *vb)
+{
+ struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+ struct vim2m_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 (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
+ if (vb->v4l2_buf.field == V4L2_FIELD_ANY)
+ vb->v4l2_buf.field = V4L2_FIELD_NONE;
+ if (vb->v4l2_buf.field != V4L2_FIELD_NONE) {
+ dprintk(ctx->dev, "%s field isn't supported\n",
+ __func__);
+ return -EINVAL;
+ }
+ }
+
+ 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 vim2m_buf_queue(struct vb2_buffer *vb)
+{
+ struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+
+ v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vb);
+}
+
+static int vim2m_start_streaming(struct vb2_queue *q, unsigned count)
+{
+ struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
+ struct vim2m_q_data *q_data = get_q_data(ctx, q->type);
+
+ q_data->sequence = 0;
+ return 0;
+}
+
+static void vim2m_stop_streaming(struct vb2_queue *q)
+{
+ struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
+ struct vb2_buffer *vb;
+ unsigned long flags;
+
+ for (;;) {
+ if (V4L2_TYPE_IS_OUTPUT(q->type))
+ vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
+ else
+ vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
+ if (vb == NULL)
+ return;
+ spin_lock_irqsave(&ctx->dev->irqlock, flags);
+ v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
+ spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
+ }
+}
+
+static struct vb2_ops vim2m_qops = {
+ .queue_setup = vim2m_queue_setup,
+ .buf_prepare = vim2m_buf_prepare,
+ .buf_queue = vim2m_buf_queue,
+ .start_streaming = vim2m_start_streaming,
+ .stop_streaming = vim2m_stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};
+
+static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
+{
+ struct vim2m_ctx *ctx = priv;
+ int ret;
+
+ src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
+ src_vq->drv_priv = ctx;
+ src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+ src_vq->ops = &vim2m_qops;
+ src_vq->mem_ops = &vb2_vmalloc_memops;
+ src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+ src_vq->lock = &ctx->dev->dev_mutex;
+
+ 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_USERPTR | VB2_DMABUF;
+ dst_vq->drv_priv = ctx;
+ dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
+ dst_vq->ops = &vim2m_qops;
+ dst_vq->mem_ops = &vb2_vmalloc_memops;
+ dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+ dst_vq->lock = &ctx->dev->dev_mutex;
+
+ return vb2_queue_init(dst_vq);
+}
+
+static const struct v4l2_ctrl_config vim2m_ctrl_trans_time_msec = {
+ .ops = &vim2m_ctrl_ops,
+ .id = V4L2_CID_TRANS_TIME_MSEC,
+ .name = "Transaction Time (msec)",
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .def = MEM2MEM_DEF_TRANSTIME,
+ .min = 1,
+ .max = 10001,
+ .step = 1,
+};
+
+static const struct v4l2_ctrl_config vim2m_ctrl_trans_num_bufs = {
+ .ops = &vim2m_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 vim2m_open(struct file *file)
+{
+ struct vim2m_dev *dev = video_drvdata(file);
+ struct vim2m_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, &vim2m_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
+ v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
+ v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_time_msec, NULL);
+ v4l2_ctrl_new_custom(hdl, &vim2m_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->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
+
+ if (IS_ERR(ctx->fh.m2m_ctx)) {
+ rc = PTR_ERR(ctx->fh.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->fh.m2m_ctx);
+
+open_unlock:
+ mutex_unlock(&dev->dev_mutex);
+ return rc;
+}
+
+static int vim2m_release(struct file *file)
+{
+ struct vim2m_dev *dev = video_drvdata(file);
+ struct vim2m_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->fh.m2m_ctx);
+ mutex_unlock(&dev->dev_mutex);
+ kfree(ctx);
+
+ atomic_dec(&dev->num_inst);
+
+ return 0;
+}
+
+static const struct v4l2_file_operations vim2m_fops = {
+ .owner = THIS_MODULE,
+ .open = vim2m_open,
+ .release = vim2m_release,
+ .poll = v4l2_m2m_fop_poll,
+ .unlocked_ioctl = video_ioctl2,
+ .mmap = v4l2_m2m_fop_mmap,
+};
+
+static struct video_device vim2m_videodev = {
+ .name = MEM2MEM_NAME,
+ .vfl_dir = VFL_DIR_M2M,
+ .fops = &vim2m_fops,
+ .ioctl_ops = &vim2m_ioctl_ops,
+ .minor = -1,
+ .release = video_device_release_empty,
+};
+
+static struct v4l2_m2m_ops m2m_ops = {
+ .device_run = device_run,
+ .job_ready = job_ready,
+ .job_abort = job_abort,
+};
+
+static int vim2m_probe(struct platform_device *pdev)
+{
+ struct vim2m_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);
+
+ dev->vfd = vim2m_videodev;
+ vfd = &dev->vfd;
+ 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 unreg_dev;
+ }
+
+ video_set_drvdata(vfd, dev);
+ snprintf(vfd->name, sizeof(vfd->name), "%s", vim2m_videodev.name);
+ 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);
+unreg_dev:
+ v4l2_device_unregister(&dev->v4l2_dev);
+
+ return ret;
+}
+
+static int vim2m_remove(struct platform_device *pdev)
+{
+ struct vim2m_dev *dev = platform_get_drvdata(pdev);
+
+ v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_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 vim2m_pdrv = {
+ .probe = vim2m_probe,
+ .remove = vim2m_remove,
+ .driver = {
+ .name = MEM2MEM_NAME,
+ },
+};
+
+static void __exit vim2m_exit(void)
+{
+ platform_driver_unregister(&vim2m_pdrv);
+ platform_device_unregister(&vim2m_pdev);
+}
+
+static int __init vim2m_init(void)
+{
+ int ret;
+
+ ret = platform_device_register(&vim2m_pdev);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&vim2m_pdrv);
+ if (ret)
+ platform_device_unregister(&vim2m_pdev);
+
+ return 0;
+}
+
+module_init(vim2m_init);
+module_exit(vim2m_exit);
Code Review / kvmfornfv.git / blobdiff