[media] media: Change v4l-core to check if source is free

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>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 14843090fd61..86c4c19b5d7b 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);
 }
 
@@ -1452,6 +1459,9 @@ 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) {
@@ -1641,7 +1651,11 @@ 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);
@@ -1695,7 +1709,11 @@ 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;
@@ -1750,7 +1768,11 @@ 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;
@@ -1764,7 +1786,11 @@ 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
@@ -1783,7 +1809,11 @@ 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;