[PATCH v3 13/22] media: Change v4l-core to check if source is free

Shuah Khan
2016-02-11T23:49:18Z

Change s_input, s_fmt, s_tuner, s_frequency, querystd,
s_hw_freq_seek, and vb2_core_streamon interfaces that
alter the tuner configuration to check if it is free,
by calling v4l_enable_media_source(). If source isn't
free, return -EBUSY. v4l_disable_media_source() is
called from v4l2_fh_exit() to release tuner (source).
vb2_core_streamon() uses v4l_vb2q_enable_media_source().

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
---
drivers/media/v4l2-core/v4l2-fh.c | 2 ++
drivers/media/v4l2-core/v4l2-ioctl.c | 30 ++++++++++++++++++++++++++++++
drivers/media/v4l2-core/videobuf2-core.c | 4 ++++
3 files changed, 36 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-fh.c b/drivers/media/v4l2-core/v4l2-fh.c
index c97067a..c183f09 100644
--- a/drivers/media/v4l2-core/v4l2-fh.c
+++ b/drivers/media/v4l2-core/v4l2-fh.c
@@ -29,6 +29,7 @@
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include <media/v4l2-ioctl.h>
+#include <media/v4l2-mc.h>

void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev)
{
@@ -92,6 +93,7 @@ void v4l2_fh_exit(struct v4l2_fh *fh)
{
if (fh->vdev == NULL)
return;
+ v4l_disable_media_source(fh->vdev);
v4l2_event_unsubscribe_all(fh);
fh->vdev = NULL;
}
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 8a018c6..ceaa44a 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -27,6 +27,7 @@
#include <media/v4l2-event.h>
#include <media/v4l2-device.h>
#include <media/videobuf2-v4l2.h>
+#include <media/v4l2-mc.h>

#include <trace/events/v4l2.h>

@@ -1041,6 +1042,12 @@ static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
+ struct video_device *vfd = video_devdata(file);
+ int ret;
+
+ ret = v4l_enable_media_source(vfd);
+ if (ret)
+ return ret;
return ops->vidioc_s_input(file, fh, *(unsigned int *)arg);
}

@@ -1448,6 +1455,9 @@ static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
int ret;

+ ret = v4l_enable_media_source(vfd);
+ if (ret)
+ return ret;
v4l_sanitize_format(p);

switch (p->type) {
@@ -1637,7 +1647,11 @@ static int v4l_s_tuner(const struct v4l2_ioctl_ops *ops,
{
struct video_device *vfd = video_devdata(file);
struct v4l2_tuner *p = arg;
+ int ret;

+ ret = v4l_enable_media_source(vfd);
+ if (ret)
+ return ret;
p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
return ops->vidioc_s_tuner(file, fh, p);
@@ -1691,7 +1705,11 @@ static int v4l_s_frequency(const struct v4l2_ioctl_ops *ops,
struct video_device *vfd = video_devdata(file);
const struct v4l2_frequency *p = arg;
enum v4l2_tuner_type type;
+ int ret;

+ ret = v4l_enable_media_source(vfd);
+ if (ret)
+ return ret;
if (vfd->vfl_type == VFL_TYPE_SDR) {
if (p->type != V4L2_TUNER_SDR && p->type != V4L2_TUNER_RF)
return -EINVAL;
@@ -1746,7 +1764,11 @@ static int v4l_s_std(const struct v4l2_ioctl_ops *ops,
{
struct video_device *vfd = video_devdata(file);
v4l2_std_id id = *(v4l2_std_id *)arg, norm;
+ int ret;

+ ret = v4l_enable_media_source(vfd);
+ if (ret)
+ return ret;
norm = id & vfd->tvnorms;
if (vfd->tvnorms && !norm) /* Check if std is supported */
return -EINVAL;
@@ -1760,7 +1782,11 @@ static int v4l_querystd(const struct v4l2_ioctl_ops *ops,
{
struct video_device *vfd = video_devdata(file);
v4l2_std_id *p = arg;
+ int ret;

+ ret = v4l_enable_media_source(vfd);
+ if (ret)
+ return ret;
/*
* If no signal is detected, then the driver should return
* V4L2_STD_UNKNOWN. Otherwise it should return tvnorms with
@@ -1779,7 +1805,11 @@ static int v4l_s_hw_freq_seek(const struct v4l2_ioctl_ops *ops,
struct video_device *vfd = video_devdata(file);
struct v4l2_hw_freq_seek *p = arg;
enum v4l2_tuner_type type;
+ int ret;

+ ret = v4l_enable_media_source(vfd);
+ if (ret)
+ return ret;
/* s_hw_freq_seek is not supported for SDR for now */
if (vfd->vfl_type == VFL_TYPE_SDR)
return -EINVAL;
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index ec5b78e..d381478 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -25,6 +25,7 @@
#include <linux/kthread.h>

#include <media/videobuf2-core.h>
+#include <media/v4l2-mc.h>

#include <trace/events/vb2.h>

@@ -1873,6 +1874,9 @@ int vb2_core_streamon(struct vb2_queue *q, unsigned int type)
* are available.
*/
if (q->queued_count >= q->min_buffers_needed) {
+ ret = v4l_vb2q_enable_media_source(q);
+ if (ret)
+ return ret;
ret = vb2_start_streaming(q);
if (ret) {
__vb2_queue_cancel(q);
--
2.5.0