V4L/DVB (4909): Add s/g_parm to cafe_ccic

Add s/g_parm support allowing applications to tweak the frame rate.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 33 insertions, 1 deletions

diff --git a/drivers/media/video/cafe_ccic.c b/drivers/media/video/cafe_ccic.c
index 9d9844e22951..e347c7ebc984 100644
--- a/drivers/media/video/cafe_ccic.c
+++ b/drivers/media/video/cafe_ccic.c
@@ -1671,6 +1671,37 @@ static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a)
         return 0;
 }
 
+/*
+ * G/S_PARM.  Most of this is done by the sensor, but we are
+ * the level which controls the number of read buffers.
+ */
+static int cafe_vidioc_g_parm(struct file *filp, void *priv,
+                struct v4l2_streamparm *parms)
+{
+        struct cafe_camera *cam = priv;
+        int ret;
+
+        mutex_lock(&cam->s_mutex);
+        ret = __cafe_cam_cmd(cam, VIDIOC_G_PARM, parms);
+        mutex_unlock(&cam->s_mutex);
+        parms->parm.capture.readbuffers = n_dma_bufs;
+        return ret;
+}
+
+static int cafe_vidioc_s_parm(struct file *filp, void *priv,
+                struct v4l2_streamparm *parms)
+{
+        struct cafe_camera *cam = priv;
+        int ret;
+
+        mutex_lock(&cam->s_mutex);
+        ret = __cafe_cam_cmd(cam, VIDIOC_S_PARM, parms);
+        mutex_unlock(&cam->s_mutex);
+        parms->parm.capture.readbuffers = n_dma_bufs;
+        return ret;
+}
+
+
 static void cafe_v4l_dev_release(struct video_device *vd)
 {
         struct cafe_camera *cam = container_of(vd, struct cafe_camera, v4ldev);
@@ -1724,7 +1755,8 @@ static struct video_device cafe_v4l_template = {
         .vidioc_queryctrl       = cafe_vidioc_queryctrl,
         .vidioc_g_ctrl          = cafe_vidioc_g_ctrl,
         .vidioc_s_ctrl          = cafe_vidioc_s_ctrl,
-        /* Do cropping someday */
+        .vidioc_g_parm          = cafe_vidioc_g_parm,
+        .vidioc_s_parm          = cafe_vidioc_s_parm,
 };