[PATCH v8 21/34] media: imx: Add Capture Device Interface
Steve Longerbeam
slongerbeam at gmail.com
Wed Jun 7 11:34:00 PDT 2017
This is the capture device interface driver that provides the v4l2
user interface. Frames can be received from various sources:
- directly from CSI for capturing unconverted images directly from
camera sensors.
- from the IC pre-process encode task.
- from the IC pre-process viewfinder task.
Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
---
drivers/staging/media/imx/Makefile | 1 +
drivers/staging/media/imx/imx-media-capture.c | 702 ++++++++++++++++++++++++++
2 files changed, 703 insertions(+)
create mode 100644 drivers/staging/media/imx/imx-media-capture.c
diff --git a/drivers/staging/media/imx/Makefile b/drivers/staging/media/imx/Makefile
index ddd7d94..4606a3a 100644
--- a/drivers/staging/media/imx/Makefile
+++ b/drivers/staging/media/imx/Makefile
@@ -3,3 +3,4 @@ imx-media-common-objs := imx-media-utils.o imx-media-fim.o
obj-$(CONFIG_VIDEO_IMX_MEDIA) += imx-media.o
obj-$(CONFIG_VIDEO_IMX_MEDIA) += imx-media-common.o
+obj-$(CONFIG_VIDEO_IMX_MEDIA) += imx-media-capture.o
diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
new file mode 100644
index 0000000..f07ed9a
--- /dev/null
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -0,0 +1,702 @@
+/*
+ * Video Capture Subdev for Freescale i.MX5/6 SOC
+ *
+ * Copyright (c) 2012-2016 Mentor Graphics Inc.
+ *
+ * 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/delay.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mc.h>
+#include <media/v4l2-subdev.h>
+#include <media/videobuf2-dma-contig.h>
+#include <video/imx-ipu-v3.h>
+#include <media/imx.h>
+#include "imx-media.h"
+
+struct capture_priv {
+ struct imx_media_video_dev vdev;
+
+ struct v4l2_subdev *src_sd;
+ int src_sd_pad;
+ struct device *dev;
+
+ struct imx_media_dev *md;
+
+ struct media_pad vdev_pad;
+
+ struct mutex mutex; /* capture device mutex */
+
+ /* the videobuf2 queue */
+ struct vb2_queue q;
+ /* list of ready imx_media_buffer's from q */
+ struct list_head ready_q;
+ /* protect ready_q */
+ spinlock_t q_lock;
+
+ /* controls inherited from subdevs */
+ struct v4l2_ctrl_handler ctrl_hdlr;
+
+ /* misc status */
+ bool stop; /* streaming is stopping */
+};
+
+#define to_capture_priv(v) container_of(v, struct capture_priv, vdev)
+
+/* In bytes, per queue */
+#define VID_MEM_LIMIT SZ_64M
+
+static struct vb2_ops capture_qops;
+
+/*
+ * Video ioctls follow
+ */
+
+static int vidioc_querycap(struct file *file, void *fh,
+ struct v4l2_capability *cap)
+{
+ struct capture_priv *priv = video_drvdata(file);
+
+ strncpy(cap->driver, "imx-media-capture", sizeof(cap->driver) - 1);
+ strncpy(cap->card, "imx-media-capture", sizeof(cap->card) - 1);
+ snprintf(cap->bus_info, sizeof(cap->bus_info),
+ "platform:%s", priv->src_sd->name);
+
+ return 0;
+}
+
+static int capture_enum_fmt_vid_cap(struct file *file, void *fh,
+ struct v4l2_fmtdesc *f)
+{
+ struct capture_priv *priv = video_drvdata(file);
+ const struct imx_media_pixfmt *cc_src;
+ struct v4l2_subdev_format fmt_src;
+ u32 fourcc;
+ int ret;
+
+ fmt_src.pad = priv->src_sd_pad;
+ fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ ret = v4l2_subdev_call(priv->src_sd, pad, get_fmt, NULL, &fmt_src);
+ if (ret) {
+ v4l2_err(priv->src_sd, "failed to get src_sd format\n");
+ return ret;
+ }
+
+ cc_src = imx_media_find_ipu_format(fmt_src.format.code, CS_SEL_ANY);
+ if (!cc_src)
+ cc_src = imx_media_find_mbus_format(fmt_src.format.code,
+ CS_SEL_ANY, true);
+ if (!cc_src)
+ return -EINVAL;
+
+ if (cc_src->bayer) {
+ if (f->index != 0)
+ return -EINVAL;
+ fourcc = cc_src->fourcc;
+ } else {
+ u32 cs_sel = (cc_src->cs == IPUV3_COLORSPACE_YUV) ?
+ CS_SEL_YUV : CS_SEL_RGB;
+
+ ret = imx_media_enum_format(&fourcc, f->index, cs_sel);
+ if (ret)
+ return ret;
+ }
+
+ f->pixelformat = fourcc;
+
+ return 0;
+}
+
+static int capture_g_fmt_vid_cap(struct file *file, void *fh,
+ struct v4l2_format *f)
+{
+ struct capture_priv *priv = video_drvdata(file);
+
+ *f = priv->vdev.fmt;
+
+ return 0;
+}
+
+static int capture_try_fmt_vid_cap(struct file *file, void *fh,
+ struct v4l2_format *f)
+{
+ struct capture_priv *priv = video_drvdata(file);
+ struct v4l2_subdev_format fmt_src;
+ const struct imx_media_pixfmt *cc, *cc_src;
+ int ret;
+
+ fmt_src.pad = priv->src_sd_pad;
+ fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ ret = v4l2_subdev_call(priv->src_sd, pad, get_fmt, NULL, &fmt_src);
+ if (ret)
+ return ret;
+
+ cc_src = imx_media_find_ipu_format(fmt_src.format.code, CS_SEL_ANY);
+ if (!cc_src)
+ cc_src = imx_media_find_mbus_format(fmt_src.format.code,
+ CS_SEL_ANY, true);
+ if (!cc_src)
+ return -EINVAL;
+
+ if (cc_src->bayer) {
+ cc = cc_src;
+ } else {
+ u32 fourcc, cs_sel;
+
+ cs_sel = (cc_src->cs == IPUV3_COLORSPACE_YUV) ?
+ CS_SEL_YUV : CS_SEL_RGB;
+ fourcc = f->fmt.pix.pixelformat;
+
+ cc = imx_media_find_format(fourcc, cs_sel, false);
+ if (!cc) {
+ imx_media_enum_format(&fourcc, 0, cs_sel);
+ cc = imx_media_find_format(fourcc, cs_sel, false);
+ }
+ }
+
+ imx_media_mbus_fmt_to_pix_fmt(&f->fmt.pix, &fmt_src.format, cc);
+
+ return 0;
+}
+
+static int capture_s_fmt_vid_cap(struct file *file, void *fh,
+ struct v4l2_format *f)
+{
+ struct capture_priv *priv = video_drvdata(file);
+ int ret;
+
+ if (vb2_is_busy(&priv->q)) {
+ v4l2_err(priv->src_sd, "%s queue busy\n", __func__);
+ return -EBUSY;
+ }
+
+ ret = capture_try_fmt_vid_cap(file, priv, f);
+ if (ret)
+ return ret;
+
+ priv->vdev.fmt.fmt.pix = f->fmt.pix;
+ priv->vdev.cc = imx_media_find_format(f->fmt.pix.pixelformat,
+ CS_SEL_ANY, true);
+
+ return 0;
+}
+
+static int capture_querystd(struct file *file, void *fh, v4l2_std_id *std)
+{
+ struct capture_priv *priv = video_drvdata(file);
+
+ return v4l2_subdev_call(priv->src_sd, video, querystd, std);
+}
+
+static int capture_g_std(struct file *file, void *fh, v4l2_std_id *std)
+{
+ struct capture_priv *priv = video_drvdata(file);
+
+ return v4l2_subdev_call(priv->src_sd, video, g_std, std);
+}
+
+static int capture_s_std(struct file *file, void *fh, v4l2_std_id std)
+{
+ struct capture_priv *priv = video_drvdata(file);
+
+ if (vb2_is_busy(&priv->q))
+ return -EBUSY;
+
+ return v4l2_subdev_call(priv->src_sd, video, s_std, std);
+}
+
+static int capture_g_parm(struct file *file, void *fh,
+ struct v4l2_streamparm *a)
+{
+ struct capture_priv *priv = video_drvdata(file);
+ struct v4l2_subdev_frame_interval fi;
+ int ret;
+
+ if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+
+ memset(&fi, 0, sizeof(fi));
+ fi.pad = priv->src_sd_pad;
+ ret = v4l2_subdev_call(priv->src_sd, video, g_frame_interval, &fi);
+ if (ret < 0)
+ return ret;
+
+ a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+ a->parm.capture.timeperframe = fi.interval;
+
+ return 0;
+}
+
+static int capture_s_parm(struct file *file, void *fh,
+ struct v4l2_streamparm *a)
+{
+ struct capture_priv *priv = video_drvdata(file);
+ struct v4l2_subdev_frame_interval fi;
+ int ret;
+
+ if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+
+ memset(&fi, 0, sizeof(fi));
+ fi.pad = priv->src_sd_pad;
+ fi.interval = a->parm.capture.timeperframe;
+ ret = v4l2_subdev_call(priv->src_sd, video, s_frame_interval, &fi);
+ if (ret < 0)
+ return ret;
+
+ a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+ a->parm.capture.timeperframe = fi.interval;
+
+ return 0;
+}
+
+static const struct v4l2_ioctl_ops capture_ioctl_ops = {
+ .vidioc_querycap = vidioc_querycap,
+
+ .vidioc_enum_fmt_vid_cap = capture_enum_fmt_vid_cap,
+ .vidioc_g_fmt_vid_cap = capture_g_fmt_vid_cap,
+ .vidioc_try_fmt_vid_cap = capture_try_fmt_vid_cap,
+ .vidioc_s_fmt_vid_cap = capture_s_fmt_vid_cap,
+
+ .vidioc_querystd = capture_querystd,
+ .vidioc_g_std = capture_g_std,
+ .vidioc_s_std = capture_s_std,
+
+ .vidioc_g_parm = capture_g_parm,
+ .vidioc_s_parm = capture_s_parm,
+
+ .vidioc_reqbufs = vb2_ioctl_reqbufs,
+ .vidioc_create_bufs = vb2_ioctl_create_bufs,
+ .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+ .vidioc_querybuf = vb2_ioctl_querybuf,
+ .vidioc_qbuf = vb2_ioctl_qbuf,
+ .vidioc_dqbuf = vb2_ioctl_dqbuf,
+ .vidioc_expbuf = vb2_ioctl_expbuf,
+ .vidioc_streamon = vb2_ioctl_streamon,
+ .vidioc_streamoff = vb2_ioctl_streamoff,
+};
+
+/*
+ * Queue operations
+ */
+
+static int capture_queue_setup(struct vb2_queue *vq,
+ unsigned int *nbuffers,
+ unsigned int *nplanes,
+ unsigned int sizes[],
+ struct device *alloc_devs[])
+{
+ struct capture_priv *priv = vb2_get_drv_priv(vq);
+ struct v4l2_pix_format *pix = &priv->vdev.fmt.fmt.pix;
+ unsigned int count = *nbuffers;
+
+ if (vq->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+
+ if (*nplanes) {
+ if (*nplanes != 1 || sizes[0] < pix->sizeimage)
+ return -EINVAL;
+ count += vq->num_buffers;
+ }
+
+ count = min_t(__u32, VID_MEM_LIMIT / pix->sizeimage, count);
+
+ if (*nplanes)
+ *nbuffers = (count < vq->num_buffers) ? 0 :
+ count - vq->num_buffers;
+ else
+ *nbuffers = count;
+
+ *nplanes = 1;
+ sizes[0] = pix->sizeimage;
+
+ return 0;
+}
+
+static int capture_buf_init(struct vb2_buffer *vb)
+{
+ struct imx_media_buffer *buf = to_imx_media_vb(vb);
+
+ INIT_LIST_HEAD(&buf->list);
+
+ return 0;
+}
+
+static int capture_buf_prepare(struct vb2_buffer *vb)
+{
+ struct vb2_queue *vq = vb->vb2_queue;
+ struct capture_priv *priv = vb2_get_drv_priv(vq);
+ struct v4l2_pix_format *pix = &priv->vdev.fmt.fmt.pix;
+
+ if (vb2_plane_size(vb, 0) < pix->sizeimage) {
+ v4l2_err(priv->src_sd,
+ "data will not fit into plane (%lu < %lu)\n",
+ vb2_plane_size(vb, 0), (long)pix->sizeimage);
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(vb, 0, pix->sizeimage);
+
+ return 0;
+}
+
+static void capture_buf_queue(struct vb2_buffer *vb)
+{
+ struct capture_priv *priv = vb2_get_drv_priv(vb->vb2_queue);
+ struct imx_media_buffer *buf = to_imx_media_vb(vb);
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->q_lock, flags);
+
+ list_add_tail(&buf->list, &priv->ready_q);
+
+ spin_unlock_irqrestore(&priv->q_lock, flags);
+}
+
+static int capture_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+ struct capture_priv *priv = vb2_get_drv_priv(vq);
+ struct imx_media_buffer *buf, *tmp;
+ unsigned long flags;
+ int ret;
+
+ if (vb2_is_streaming(vq))
+ return 0;
+
+ ret = imx_media_pipeline_set_stream(priv->md, &priv->src_sd->entity,
+ true);
+ if (ret) {
+ v4l2_err(priv->src_sd, "pipeline start failed with %d\n", ret);
+ goto return_bufs;
+ }
+
+ priv->stop = false;
+
+ return 0;
+
+return_bufs:
+ spin_lock_irqsave(&priv->q_lock, flags);
+ list_for_each_entry_safe(buf, tmp, &priv->ready_q, list) {
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vbuf.vb2_buf, VB2_BUF_STATE_QUEUED);
+ }
+ spin_unlock_irqrestore(&priv->q_lock, flags);
+ return ret;
+}
+
+static void capture_stop_streaming(struct vb2_queue *vq)
+{
+ struct capture_priv *priv = vb2_get_drv_priv(vq);
+ struct imx_media_buffer *frame;
+ unsigned long flags;
+ int ret;
+
+ if (!vb2_is_streaming(vq))
+ return;
+
+ spin_lock_irqsave(&priv->q_lock, flags);
+ priv->stop = true;
+ spin_unlock_irqrestore(&priv->q_lock, flags);
+
+ ret = imx_media_pipeline_set_stream(priv->md, &priv->src_sd->entity,
+ false);
+ if (ret)
+ v4l2_warn(priv->src_sd, "pipeline stop failed with %d\n", ret);
+
+ /* release all active buffers */
+ spin_lock_irqsave(&priv->q_lock, flags);
+ while (!list_empty(&priv->ready_q)) {
+ frame = list_entry(priv->ready_q.next,
+ struct imx_media_buffer, list);
+ list_del(&frame->list);
+ vb2_buffer_done(&frame->vbuf.vb2_buf, VB2_BUF_STATE_ERROR);
+ }
+ spin_unlock_irqrestore(&priv->q_lock, flags);
+}
+
+static struct vb2_ops capture_qops = {
+ .queue_setup = capture_queue_setup,
+ .buf_init = capture_buf_init,
+ .buf_prepare = capture_buf_prepare,
+ .buf_queue = capture_buf_queue,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+ .start_streaming = capture_start_streaming,
+ .stop_streaming = capture_stop_streaming,
+};
+
+/*
+ * File operations
+ */
+static int capture_open(struct file *file)
+{
+ struct capture_priv *priv = video_drvdata(file);
+ struct video_device *vfd = priv->vdev.vfd;
+ int ret;
+
+ if (mutex_lock_interruptible(&priv->mutex))
+ return -ERESTARTSYS;
+
+ ret = v4l2_fh_open(file);
+ if (ret)
+ v4l2_err(priv->src_sd, "v4l2_fh_open failed\n");
+
+ ret = v4l2_pipeline_pm_use(&vfd->entity, 1);
+ if (ret)
+ v4l2_fh_release(file);
+
+ mutex_unlock(&priv->mutex);
+ return ret;
+}
+
+static int capture_release(struct file *file)
+{
+ struct capture_priv *priv = video_drvdata(file);
+ struct video_device *vfd = priv->vdev.vfd;
+ struct vb2_queue *vq = &priv->q;
+ int ret = 0;
+
+ mutex_lock(&priv->mutex);
+
+ if (file->private_data == vq->owner) {
+ vb2_queue_release(vq);
+ vq->owner = NULL;
+ }
+
+ v4l2_pipeline_pm_use(&vfd->entity, 0);
+
+ v4l2_fh_release(file);
+ mutex_unlock(&priv->mutex);
+ return ret;
+}
+
+static const struct v4l2_file_operations capture_fops = {
+ .owner = THIS_MODULE,
+ .open = capture_open,
+ .release = capture_release,
+ .poll = vb2_fop_poll,
+ .unlocked_ioctl = video_ioctl2,
+ .mmap = vb2_fop_mmap,
+};
+
+static struct video_device capture_videodev = {
+ .fops = &capture_fops,
+ .ioctl_ops = &capture_ioctl_ops,
+ .minor = -1,
+ .release = video_device_release,
+ .vfl_dir = VFL_DIR_RX,
+ .tvnorms = V4L2_STD_NTSC | V4L2_STD_PAL | V4L2_STD_SECAM,
+ .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING,
+};
+
+void imx_media_capture_device_set_format(struct imx_media_video_dev *vdev,
+ struct v4l2_pix_format *pix)
+{
+ struct capture_priv *priv = to_capture_priv(vdev);
+
+ mutex_lock(&priv->mutex);
+ priv->vdev.fmt.fmt.pix = *pix;
+ priv->vdev.cc = imx_media_find_format(pix->pixelformat, CS_SEL_ANY,
+ true);
+ mutex_unlock(&priv->mutex);
+}
+EXPORT_SYMBOL_GPL(imx_media_capture_device_set_format);
+
+struct imx_media_buffer *
+imx_media_capture_device_next_buf(struct imx_media_video_dev *vdev)
+{
+ struct capture_priv *priv = to_capture_priv(vdev);
+ struct imx_media_buffer *buf = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->q_lock, flags);
+
+ /* get next queued buffer */
+ if (!list_empty(&priv->ready_q)) {
+ buf = list_entry(priv->ready_q.next, struct imx_media_buffer,
+ list);
+ list_del(&buf->list);
+ }
+
+ spin_unlock_irqrestore(&priv->q_lock, flags);
+
+ return buf;
+}
+EXPORT_SYMBOL_GPL(imx_media_capture_device_next_buf);
+
+void imx_media_capture_device_error(struct imx_media_video_dev *vdev)
+{
+ struct capture_priv *priv = to_capture_priv(vdev);
+ struct vb2_queue *vq = &priv->q;
+ unsigned long flags;
+
+ if (!vb2_is_streaming(vq))
+ return;
+
+ spin_lock_irqsave(&priv->q_lock, flags);
+ vb2_queue_error(vq);
+ spin_unlock_irqrestore(&priv->q_lock, flags);
+}
+EXPORT_SYMBOL_GPL(imx_media_capture_device_error);
+
+int imx_media_capture_device_register(struct imx_media_video_dev *vdev)
+{
+ struct capture_priv *priv = to_capture_priv(vdev);
+ struct v4l2_subdev *sd = priv->src_sd;
+ struct video_device *vfd = vdev->vfd;
+ struct vb2_queue *vq = &priv->q;
+ struct v4l2_subdev_format fmt_src;
+ int ret;
+
+ /* get media device */
+ priv->md = dev_get_drvdata(sd->v4l2_dev->dev);
+
+ vfd->v4l2_dev = sd->v4l2_dev;
+
+ ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
+ if (ret) {
+ v4l2_err(sd, "Failed to register video device\n");
+ return ret;
+ }
+
+ vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ vq->io_modes = VB2_MMAP | VB2_DMABUF;
+ vq->drv_priv = priv;
+ vq->buf_struct_size = sizeof(struct imx_media_buffer);
+ vq->ops = &capture_qops;
+ vq->mem_ops = &vb2_dma_contig_memops;
+ vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+ vq->lock = &priv->mutex;
+ vq->min_buffers_needed = 2;
+ vq->dev = priv->dev;
+
+ ret = vb2_queue_init(vq);
+ if (ret) {
+ v4l2_err(sd, "vb2_queue_init failed\n");
+ goto unreg;
+ }
+
+ INIT_LIST_HEAD(&priv->ready_q);
+
+ priv->vdev_pad.flags = MEDIA_PAD_FL_SINK;
+ ret = media_entity_pads_init(&vfd->entity, 1, &priv->vdev_pad);
+ if (ret) {
+ v4l2_err(sd, "failed to init dev pad\n");
+ goto unreg;
+ }
+
+ /* create the link from the src_sd devnode pad to device node */
+ ret = media_create_pad_link(&sd->entity, priv->src_sd_pad,
+ &vfd->entity, 0, 0);
+ if (ret) {
+ v4l2_err(sd, "failed to create link to device node\n");
+ goto unreg;
+ }
+
+ /* setup default format */
+ fmt_src.pad = priv->src_sd_pad;
+ fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt_src);
+ if (ret) {
+ v4l2_err(sd, "failed to get src_sd format\n");
+ goto unreg;
+ }
+
+ vdev->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ imx_media_mbus_fmt_to_pix_fmt(&vdev->fmt.fmt.pix,
+ &fmt_src.format, NULL);
+ vdev->cc = imx_media_find_format(vdev->fmt.fmt.pix.pixelformat,
+ CS_SEL_ANY, false);
+
+ v4l2_info(sd, "Registered %s as /dev/%s\n", vfd->name,
+ video_device_node_name(vfd));
+
+ vfd->ctrl_handler = &priv->ctrl_hdlr;
+
+ return 0;
+unreg:
+ video_unregister_device(vfd);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(imx_media_capture_device_register);
+
+void imx_media_capture_device_unregister(struct imx_media_video_dev *vdev)
+{
+ struct capture_priv *priv = to_capture_priv(vdev);
+ struct video_device *vfd = priv->vdev.vfd;
+
+ mutex_lock(&priv->mutex);
+
+ if (video_is_registered(vfd)) {
+ video_unregister_device(vfd);
+ media_entity_cleanup(&vfd->entity);
+ }
+
+ mutex_unlock(&priv->mutex);
+}
+EXPORT_SYMBOL_GPL(imx_media_capture_device_unregister);
+
+struct imx_media_video_dev *
+imx_media_capture_device_init(struct v4l2_subdev *src_sd, int pad)
+{
+ struct capture_priv *priv;
+ struct video_device *vfd;
+
+ priv = devm_kzalloc(src_sd->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return ERR_PTR(-ENOMEM);
+
+ priv->src_sd = src_sd;
+ priv->src_sd_pad = pad;
+ priv->dev = src_sd->dev;
+
+ mutex_init(&priv->mutex);
+ spin_lock_init(&priv->q_lock);
+
+ snprintf(capture_videodev.name, sizeof(capture_videodev.name),
+ "%s capture", src_sd->name);
+
+ vfd = video_device_alloc();
+ if (!vfd)
+ return ERR_PTR(-ENOMEM);
+
+ *vfd = capture_videodev;
+ vfd->lock = &priv->mutex;
+ vfd->queue = &priv->q;
+ priv->vdev.vfd = vfd;
+
+ video_set_drvdata(vfd, priv);
+
+ v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);
+
+ return &priv->vdev;
+}
+EXPORT_SYMBOL_GPL(imx_media_capture_device_init);
+
+void imx_media_capture_device_remove(struct imx_media_video_dev *vdev)
+{
+ struct capture_priv *priv = to_capture_priv(vdev);
+
+ v4l2_ctrl_handler_free(&priv->ctrl_hdlr);
+}
+EXPORT_SYMBOL_GPL(imx_media_capture_device_remove);
+
+MODULE_DESCRIPTION("i.MX5/6 v4l2 video capture interface driver");
+MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam at mentor.com>");
+MODULE_LICENSE("GPL");
--
2.7.4
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