[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>

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index f662df3..ec89fd1 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -297,8 +297,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
                "Text",
                NULL
        };
-       static const char * const tune_preemphasis[] = {
-               "No Preemphasis",
+       static const char * const tune_emphasis[] = {
+               "None",
                "50 Microseconds",
                "75 Microseconds",
                NULL,
@@ -508,7 +508,9 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
        case V4L2_CID_SCENE_MODE:
                return scene_mode;
        case V4L2_CID_TUNE_PREEMPHASIS:
-               return tune_preemphasis;
+               return tune_emphasis;
+       case V4L2_CID_TUNE_DEEMPHASIS:
+               return tune_emphasis;
        case V4L2_CID_FLASH_LED_MODE:
                return flash_led_mode;
        case V4L2_CID_FLASH_STROBE_SOURCE:
@@ -800,6 +802,9 @@ const char *v4l2_ctrl_get_name(u32 id)
        case V4L2_CID_DV_RX_POWER_PRESENT:      return "Power Present";
        case V4L2_CID_DV_RX_RGB_RANGE:          return "Rx RGB Quantization Range";
 
+       case V4L2_CID_FM_RX_CLASS:              return "FM Radio Receiver Controls";
+       case V4L2_CID_TUNE_DEEMPHASIS:          return "De-Emphasis";
+       case V4L2_CID_RDS_RECEPTION:            return "RDS Reception";
        default:
                return NULL;
        }
@@ -848,6 +853,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
        case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:
        case V4L2_CID_WIDE_DYNAMIC_RANGE:
        case V4L2_CID_IMAGE_STABILIZATION:
+       case V4L2_CID_RDS_RECEPTION:
                *type = V4L2_CTRL_TYPE_BOOLEAN;
                *min = 0;
                *max = *step = 1;
@@ -906,6 +912,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
        case V4L2_CID_DV_TX_RGB_RANGE:
        case V4L2_CID_DV_RX_RGB_RANGE:
        case V4L2_CID_TEST_PATTERN:
+       case V4L2_CID_TUNE_DEEMPHASIS:
                *type = V4L2_CTRL_TYPE_MENU;
                break;
        case V4L2_CID_LINK_FREQ:
@@ -928,6 +935,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
        case V4L2_CID_IMAGE_SOURCE_CLASS:
        case V4L2_CID_IMAGE_PROC_CLASS:
        case V4L2_CID_DV_CLASS:
+       case V4L2_CID_FM_RX_CLASS:
                *type = V4L2_CTRL_TYPE_CTRL_CLASS;
                /* You can neither read not write these */
                *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY;

diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 844dc02..7d26048 100644 (file)
--- 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