[media] v4l2: Add standard controls for FM receivers

This commit introduces new class of standard controls
V4L2_CTRL_CLASS_FM_RX. This class is intended to all controls
pertaining to FM receiver chips. Also, two controls belonging to said
class are added as a part of this commit: V4L2_CID_TUNE_DEEMPHASIS and
V4L2_CID_RDS_RECEPTION.
This patch is based on the code found in the patch by Manjunatha Halli [1]
[1] http://lists-archives.com/linux-kernel/27641307-new-control-class-and-features-for-fm-rx.html

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 844dc0205037..7d2604877a73 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -59,6 +59,7 @@
 #define V4L2_CTRL_CLASS_IMAGE_SOURCE    0x009e0000      /* Image source controls */
 #define V4L2_CTRL_CLASS_IMAGE_PROC      0x009f0000      /* Image processing controls */
 #define V4L2_CTRL_CLASS_DV              0x00a00000      /* Digital Video controls */
+#define V4L2_CTRL_CLASS_FM_RX           0x00a10000      /* Digital Video controls */
 
 /* User-class control IDs */
 
@@ -835,4 +836,16 @@ enum v4l2_dv_rgb_range {
 #define V4L2_CID_DV_RX_POWER_PRESENT            (V4L2_CID_DV_CLASS_BASE + 100)
 #define V4L2_CID_DV_RX_RGB_RANGE                (V4L2_CID_DV_CLASS_BASE + 101)
 
+#define V4L2_CID_FM_RX_CLASS_BASE               (V4L2_CTRL_CLASS_FM_RX | 0x900)
+#define V4L2_CID_FM_RX_CLASS                    (V4L2_CTRL_CLASS_FM_RX | 1)
+
+#define V4L2_CID_TUNE_DEEMPHASIS                (V4L2_CID_FM_RX_CLASS_BASE + 1)
+enum v4l2_deemphasis {
+        V4L2_DEEMPHASIS_DISABLED        = V4L2_PREEMPHASIS_DISABLED,
+        V4L2_DEEMPHASIS_50_uS           = V4L2_PREEMPHASIS_50_uS,
+        V4L2_DEEMPHASIS_75_uS           = V4L2_PREEMPHASIS_75_uS,
+};
+
+#define V4L2_CID_RDS_RECEPTION                  (V4L2_CID_FM_RX_CLASS_BASE + 2)
+
 #endif