[PATCH v3 13/21] media: Change v4l-core to check for tuner availability

From: Shuah Khan <shuahkh@osg.samsung.com>
To: mchehab@osg.samsung.com, hans.verkuil@cisco.com,
	laurent.pinchart@ideasonboard.com, sakari.ailus@linux.intel.com,
	tiwai@suse.de, pawel@osciak.com, m.szyprowski@samsung.com,
	kyungmin.park@samsung.com, perex@perex.cz,
	stefanr@s5r6.in-berlin.de, crope@iki.fi,
	dan.carpenter@oracle.com, tskd08@gmail.com,
	ruchandani.tina@gmail.com, arnd@arndb.de, chehabrafael@gmail.com,
	prabhakar.csengg@gmail.com, Julia.Lawall@lip6.fr,
	elfring@users.sourceforge.net, ricardo.ribalda@gmail.com,
	chris.j.arges@canonical.com,
	pierre-louis.bossart@linux.intel.com, gtmkramer@xs4all.nl,
	clemens@ladisch.de, misterpib@gmail.com, takamichiho@gmail.com,
	pmatilai@laiskiainen.org, damien@zamaudio.com, daniel@zonque.org,
	vladcatoi@gmail.com, normalperson@yhbt.net, joe@oampo.co.uk,
	bugzilla.frnkcg@spamgourmet.com, jussi@sonarnerd.net
Cc: Shuah Khan <shuahkh@osg.samsung.com>,
	linux-media@vger.kernel.org, alsa-devel@alsa-project.org
Subject: [PATCH v3 13/21] media: Change v4l-core to check for tuner availability
Date: Tue, 22 Sep 2015 11:19:32 -0600	[thread overview]
Message-ID: <2fd0fa2d594d7b67023e6484b08ef645925d77b8.1442937669.git.shuahkh@osg.samsung.com> (raw)
In-Reply-To: <cover.1442937669.git.shuahkh@osg.samsung.com>
In-Reply-To: <cover.1442937669.git.shuahkh@osg.samsung.com>

Change s_input, s_fmt, s_tuner, s_frequency, querystd,
s_hw_freq_seek, and vb2_internal_streamon interfaces that
alter the tuner configuration to check for tuner availability
by calling v4l_enable_media_tuner(). If tuner isn't free,
return -EBUSY. v4l_disable_media_tuner() is called from
v4l2_fh_exit() to release the tuner.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
---
 drivers/media/v4l2-core/v4l2-fh.c        |  1 +
 drivers/media/v4l2-core/v4l2-ioctl.c     | 29 +++++++++++++++++++++++++++++
 drivers/media/v4l2-core/videobuf2-core.c |  3 +++
 3 files changed, 33 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-fh.c b/drivers/media/v4l2-core/v4l2-fh.c
index c97067a..538db62 100644
--- a/drivers/media/v4l2-core/v4l2-fh.c
+++ b/drivers/media/v4l2-core/v4l2-fh.c
@@ -92,6 +92,7 @@ void v4l2_fh_exit(struct v4l2_fh *fh)
 {
 	if (fh->vdev == NULL)
 		return;
+	v4l_disable_media_tuner(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 85de455..deffc1b 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1035,6 +1035,12 @@ 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_tuner(vfd);
+	if (ret)
+		return ret;
 	return ops->vidioc_s_input(file, fh, *(unsigned int *)arg);
 }
 
@@ -1433,6 +1439,9 @@ 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_tuner(vfd);
+	if (ret)
+		return ret;
 	v4l_sanitize_format(p);
 
 	switch (p->type) {
@@ -1612,7 +1621,11 @@ 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_tuner(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);
@@ -1650,7 +1663,11 @@ 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_tuner(vfd);
+	if (ret)
+		return ret;
 	if (vfd->vfl_type == VFL_TYPE_SDR) {
 		if (p->type != V4L2_TUNER_ADC && p->type != V4L2_TUNER_RF)
 			return -EINVAL;
@@ -1705,7 +1722,11 @@ 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_tuner(vfd);
+	if (ret)
+		return ret;
 	norm = id & vfd->tvnorms;
 	if (vfd->tvnorms && !norm)	/* Check if std is supported */
 		return -EINVAL;
@@ -1719,7 +1740,11 @@ 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_tuner(vfd);
+	if (ret)
+		return ret;
 	/*
 	 * If no signal is detected, then the driver should return
 	 * V4L2_STD_UNKNOWN. Otherwise it should return tvnorms with
@@ -1738,7 +1763,11 @@ 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_tuner(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 d835814..f7304d8 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -2251,6 +2251,9 @@ static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
 	 * are available.
 	 */
 	if (q->queued_count >= q->min_buffers_needed) {
+		ret = v4l_enable_media_tuner(q->owner->vdev);
+		if (ret)
+			return ret;
 		ret = vb2_start_streaming(q);
 		if (ret) {
 			__vb2_queue_cancel(q);
-- 
2.1.4

