V4L/DVB (9876): gspca - main: Allow subdrivers to handle v4l2_streamparm requests.

Add get_streamparm and set_streamparm operations so subdrivers can
get/set stream parameters such as framerate.

Signed-off-by: Jim Paris <jim@jtan.com>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index a5c21ca959d8..76cfb096e4f8 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -1327,6 +1327,17 @@ static int vidioc_g_parm(struct file *filp, void *priv,
         memset(parm, 0, sizeof *parm);
         parm->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
         parm->parm.capture.readbuffers = gspca_dev->nbufread;
+
+        if (gspca_dev->sd_desc->get_streamparm) {
+                int ret;
+
+                if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+                        return -ERESTARTSYS;
+                ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
+                mutex_unlock(&gspca_dev->usb_lock);
+                return ret;
+        }
+
         return 0;
 }
 
@@ -1341,6 +1352,17 @@ static int vidioc_s_parm(struct file *filp, void *priv,
                 parm->parm.capture.readbuffers = gspca_dev->nbufread;
         else
                 gspca_dev->nbufread = n;
+
+        if (gspca_dev->sd_desc->set_streamparm) {
+                int ret;
+
+                if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+                        return -ERESTARTSYS;
+                ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
+                mutex_unlock(&gspca_dev->usb_lock);
+                return ret;
+        }
+
         return 0;
 }