V4L/DVB: soc-camera: add runtime pm support for subdevices

To save power soc-camera powers subdevices down, when they are not in use,
if this is supported by the platform. However, the V4L standard dictates,
that video nodes shall preserve configuration between uses. This requires
runtime power management, which is implemented by this patch. It allows
subdevice drivers to specify their runtime power-management methods, by
assigning a type to the video device.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
index 5a173652cf4a..c9a5bbfa6ab5 100644
--- a/include/media/soc_camera.h
+++ b/include/media/soc_camera.h
@@ -284,4 +284,12 @@ static inline void soc_camera_limit_side(int *start, int *length,
 extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
                                                    unsigned long flags);
 
+/* This is only temporary here - until v4l2-subdev begins to link to video_device */
+#include <linux/i2c.h>
+static inline struct video_device *soc_camera_i2c_to_vdev(struct i2c_client *client)
+{
+        struct soc_camera_device *icd = client->dev.platform_data;
+        return icd->vdev;
+}
+
 #endif