diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index cc93859..2ea34a6 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -11,7 +11,7 @@ stkwebcam-objs	:=	stk-webcam.o stk-sensor.o
 omap2cam-objs	:=	omap24xxcam.o omap24xxcam-dma.o
 
 videodev-objs	:=	v4l2-dev.o v4l2-ioctl.o v4l2-device.o v4l2-fh.o \
-			v4l2-event.o
+			v4l2-event.o v4l2-ctrls.o
 
 # V4L2 core modules
 
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
index 4e53b0b..3ce7c64 100644
--- a/drivers/media/video/v4l2-common.c
+++ b/drivers/media/video/v4l2-common.c
@@ -62,6 +62,7 @@
 #define __OLD_VIDIOC_ /* To allow fixing old calls*/
 #include <media/v4l2-common.h>
 #include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
 #include <media/v4l2-chip-ident.h>
 
 #include <linux/videodev2.h>
@@ -172,487 +173,17 @@ int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
 }
 EXPORT_SYMBOL(v4l2_ctrl_check);
 
-/* Returns NULL or a character pointer array containing the menu for
-   the given control ID. The pointer array ends with a NULL pointer.
-   An empty string signifies a menu entry that is invalid. This allows
-   drivers to disable certain options if it is not supported. */
-const char **v4l2_ctrl_get_menu(u32 id)
-{
-	static const char *mpeg_audio_sampling_freq[] = {
-		"44.1 kHz",
-		"48 kHz",
-		"32 kHz",
-		NULL
-	};
-	static const char *mpeg_audio_encoding[] = {
-		"MPEG-1/2 Layer I",
-		"MPEG-1/2 Layer II",
-		"MPEG-1/2 Layer III",
-		"MPEG-2/4 AAC",
-		"AC-3",
-		NULL
-	};
-	static const char *mpeg_audio_l1_bitrate[] = {
-		"32 kbps",
-		"64 kbps",
-		"96 kbps",
-		"128 kbps",
-		"160 kbps",
-		"192 kbps",
-		"224 kbps",
-		"256 kbps",
-		"288 kbps",
-		"320 kbps",
-		"352 kbps",
-		"384 kbps",
-		"416 kbps",
-		"448 kbps",
-		NULL
-	};
-	static const char *mpeg_audio_l2_bitrate[] = {
-		"32 kbps",
-		"48 kbps",
-		"56 kbps",
-		"64 kbps",
-		"80 kbps",
-		"96 kbps",
-		"112 kbps",
-		"128 kbps",
-		"160 kbps",
-		"192 kbps",
-		"224 kbps",
-		"256 kbps",
-		"320 kbps",
-		"384 kbps",
-		NULL
-	};
-	static const char *mpeg_audio_l3_bitrate[] = {
-		"32 kbps",
-		"40 kbps",
-		"48 kbps",
-		"56 kbps",
-		"64 kbps",
-		"80 kbps",
-		"96 kbps",
-		"112 kbps",
-		"128 kbps",
-		"160 kbps",
-		"192 kbps",
-		"224 kbps",
-		"256 kbps",
-		"320 kbps",
-		NULL
-	};
-	static const char *mpeg_audio_ac3_bitrate[] = {
-		"32 kbps",
-		"40 kbps",
-		"48 kbps",
-		"56 kbps",
-		"64 kbps",
-		"80 kbps",
-		"96 kbps",
-		"112 kbps",
-		"128 kbps",
-		"160 kbps",
-		"192 kbps",
-		"224 kbps",
-		"256 kbps",
-		"320 kbps",
-		"384 kbps",
-		"448 kbps",
-		"512 kbps",
-		"576 kbps",
-		"640 kbps",
-		NULL
-	};
-	static const char *mpeg_audio_mode[] = {
-		"Stereo",
-		"Joint Stereo",
-		"Dual",
-		"Mono",
-		NULL
-	};
-	static const char *mpeg_audio_mode_extension[] = {
-		"Bound 4",
-		"Bound 8",
-		"Bound 12",
-		"Bound 16",
-		NULL
-	};
-	static const char *mpeg_audio_emphasis[] = {
-		"No Emphasis",
-		"50/15 us",
-		"CCITT J17",
-		NULL
-	};
-	static const char *mpeg_audio_crc[] = {
-		"No CRC",
-		"16-bit CRC",
-		NULL
-	};
-	static const char *mpeg_video_encoding[] = {
-		"MPEG-1",
-		"MPEG-2",
-		"MPEG-4 AVC",
-		NULL
-	};
-	static const char *mpeg_video_aspect[] = {
-		"1x1",
-		"4x3",
-		"16x9",
-		"2.21x1",
-		NULL
-	};
-	static const char *mpeg_video_bitrate_mode[] = {
-		"Variable Bitrate",
-		"Constant Bitrate",
-		NULL
-	};
-	static const char *mpeg_stream_type[] = {
-		"MPEG-2 Program Stream",
-		"MPEG-2 Transport Stream",
-		"MPEG-1 System Stream",
-		"MPEG-2 DVD-compatible Stream",
-		"MPEG-1 VCD-compatible Stream",
-		"MPEG-2 SVCD-compatible Stream",
-		NULL
-	};
-	static const char *mpeg_stream_vbi_fmt[] = {
-		"No VBI",
-		"Private packet, IVTV format",
-		NULL
-	};
-	static const char *camera_power_line_frequency[] = {
-		"Disabled",
-		"50 Hz",
-		"60 Hz",
-		NULL
-	};
-	static const char *camera_exposure_auto[] = {
-		"Auto Mode",
-		"Manual Mode",
-		"Shutter Priority Mode",
-		"Aperture Priority Mode",
-		NULL
-	};
-	static const char *colorfx[] = {
-		"None",
-		"Black & White",
-		"Sepia",
-		"Negative",
-		"Emboss",
-		"Sketch",
-		"Sky blue",
-		"Grass green",
-		"Skin whiten",
-		"Vivid",
-		NULL
-	};
-	static const char *tune_preemphasis[] = {
-		"No preemphasis",
-		"50 useconds",
-		"75 useconds",
-		NULL,
-	};
-
-	switch (id) {
-		case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
-			return mpeg_audio_sampling_freq;
-		case V4L2_CID_MPEG_AUDIO_ENCODING:
-			return mpeg_audio_encoding;
-		case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
-			return mpeg_audio_l1_bitrate;
-		case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
-			return mpeg_audio_l2_bitrate;
-		case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
-			return mpeg_audio_l3_bitrate;
-		case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
-			return mpeg_audio_ac3_bitrate;
-		case V4L2_CID_MPEG_AUDIO_MODE:
-			return mpeg_audio_mode;
-		case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
-			return mpeg_audio_mode_extension;
-		case V4L2_CID_MPEG_AUDIO_EMPHASIS:
-			return mpeg_audio_emphasis;
-		case V4L2_CID_MPEG_AUDIO_CRC:
-			return mpeg_audio_crc;
-		case V4L2_CID_MPEG_VIDEO_ENCODING:
-			return mpeg_video_encoding;
-		case V4L2_CID_MPEG_VIDEO_ASPECT:
-			return mpeg_video_aspect;
-		case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
-			return mpeg_video_bitrate_mode;
-		case V4L2_CID_MPEG_STREAM_TYPE:
-			return mpeg_stream_type;
-		case V4L2_CID_MPEG_STREAM_VBI_FMT:
-			return mpeg_stream_vbi_fmt;
-		case V4L2_CID_POWER_LINE_FREQUENCY:
-			return camera_power_line_frequency;
-		case V4L2_CID_EXPOSURE_AUTO:
-			return camera_exposure_auto;
-		case V4L2_CID_COLORFX:
-			return colorfx;
-		case V4L2_CID_TUNE_PREEMPHASIS:
-			return tune_preemphasis;
-		default:
-			return NULL;
-	}
-}
-EXPORT_SYMBOL(v4l2_ctrl_get_menu);
-
-/* Return the control name. */
-const char *v4l2_ctrl_get_name(u32 id)
-{
-	switch (id) {
-	/* USER controls */
-	case V4L2_CID_USER_CLASS: 		return "User Controls";
-	case V4L2_CID_BRIGHTNESS: 		return "Brightness";
-	case V4L2_CID_CONTRAST: 		return "Contrast";
-	case V4L2_CID_SATURATION: 		return "Saturation";
-	case V4L2_CID_HUE: 			return "Hue";
-	case V4L2_CID_AUDIO_VOLUME: 		return "Volume";
-	case V4L2_CID_AUDIO_BALANCE: 		return "Balance";
-	case V4L2_CID_AUDIO_BASS: 		return "Bass";
-	case V4L2_CID_AUDIO_TREBLE: 		return "Treble";
-	case V4L2_CID_AUDIO_MUTE: 		return "Mute";
-	case V4L2_CID_AUDIO_LOUDNESS: 		return "Loudness";
-	case V4L2_CID_BLACK_LEVEL:		return "Black Level";
-	case V4L2_CID_AUTO_WHITE_BALANCE:	return "White Balance, Automatic";
-	case V4L2_CID_DO_WHITE_BALANCE:		return "Do White Balance";
-	case V4L2_CID_RED_BALANCE:		return "Red Balance";
-	case V4L2_CID_BLUE_BALANCE:		return "Blue Balance";
-	case V4L2_CID_GAMMA:			return "Gamma";
-	case V4L2_CID_EXPOSURE:			return "Exposure";
-	case V4L2_CID_AUTOGAIN:			return "Gain, Automatic";
-	case V4L2_CID_GAIN:			return "Gain";
-	case V4L2_CID_HFLIP:			return "Horizontal Flip";
-	case V4L2_CID_VFLIP:			return "Vertical Flip";
-	case V4L2_CID_HCENTER:			return "Horizontal Center";
-	case V4L2_CID_VCENTER:			return "Vertical Center";
-	case V4L2_CID_POWER_LINE_FREQUENCY:	return "Power Line Frequency";
-	case V4L2_CID_HUE_AUTO:			return "Hue, Automatic";
-	case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
-	case V4L2_CID_SHARPNESS:		return "Sharpness";
-	case V4L2_CID_BACKLIGHT_COMPENSATION:	return "Backlight Compensation";
-	case V4L2_CID_CHROMA_AGC:		return "Chroma AGC";
-	case V4L2_CID_CHROMA_GAIN:		return "Chroma Gain";
-	case V4L2_CID_COLOR_KILLER:		return "Color Killer";
-	case V4L2_CID_COLORFX:			return "Color Effects";
-	case V4L2_CID_AUTOBRIGHTNESS:		return "Brightness, Automatic";
-	case V4L2_CID_BAND_STOP_FILTER:		return "Band-Stop Filter";
-	case V4L2_CID_ROTATE:			return "Rotate";
-	case V4L2_CID_BG_COLOR:			return "Background Color";
-
-	/* MPEG controls */
-	case V4L2_CID_MPEG_CLASS: 		return "MPEG Encoder Controls";
-	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
-	case V4L2_CID_MPEG_AUDIO_ENCODING: 	return "Audio Encoding";
-	case V4L2_CID_MPEG_AUDIO_L1_BITRATE: 	return "Audio Layer I Bitrate";
-	case V4L2_CID_MPEG_AUDIO_L2_BITRATE: 	return "Audio Layer II Bitrate";
-	case V4L2_CID_MPEG_AUDIO_L3_BITRATE: 	return "Audio Layer III Bitrate";
-	case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: 	return "Audio AAC Bitrate";
-	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: 	return "Audio AC-3 Bitrate";
-	case V4L2_CID_MPEG_AUDIO_MODE: 		return "Audio Stereo Mode";
-	case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
-	case V4L2_CID_MPEG_AUDIO_EMPHASIS: 	return "Audio Emphasis";
-	case V4L2_CID_MPEG_AUDIO_CRC: 		return "Audio CRC";
-	case V4L2_CID_MPEG_AUDIO_MUTE: 		return "Audio Mute";
-	case V4L2_CID_MPEG_VIDEO_ENCODING: 	return "Video Encoding";
-	case V4L2_CID_MPEG_VIDEO_ASPECT: 	return "Video Aspect";
-	case V4L2_CID_MPEG_VIDEO_B_FRAMES: 	return "Video B Frames";
-	case V4L2_CID_MPEG_VIDEO_GOP_SIZE: 	return "Video GOP Size";
-	case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: 	return "Video GOP Closure";
-	case V4L2_CID_MPEG_VIDEO_PULLDOWN: 	return "Video Pulldown";
-	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: 	return "Video Bitrate Mode";
-	case V4L2_CID_MPEG_VIDEO_BITRATE: 	return "Video Bitrate";
-	case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: 	return "Video Peak Bitrate";
-	case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
-	case V4L2_CID_MPEG_VIDEO_MUTE: 		return "Video Mute";
-	case V4L2_CID_MPEG_VIDEO_MUTE_YUV:	return "Video Mute YUV";
-	case V4L2_CID_MPEG_STREAM_TYPE: 	return "Stream Type";
-	case V4L2_CID_MPEG_STREAM_PID_PMT: 	return "Stream PMT Program ID";
-	case V4L2_CID_MPEG_STREAM_PID_AUDIO: 	return "Stream Audio Program ID";
-	case V4L2_CID_MPEG_STREAM_PID_VIDEO: 	return "Stream Video Program ID";
-	case V4L2_CID_MPEG_STREAM_PID_PCR: 	return "Stream PCR Program ID";
-	case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
-	case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
-	case V4L2_CID_MPEG_STREAM_VBI_FMT:	return "Stream VBI Format";
-
-	/* CAMERA controls */
-	case V4L2_CID_CAMERA_CLASS:		return "Camera Controls";
-	case V4L2_CID_EXPOSURE_AUTO:		return "Auto Exposure";
-	case V4L2_CID_EXPOSURE_ABSOLUTE:	return "Exposure Time, Absolute";
-	case V4L2_CID_EXPOSURE_AUTO_PRIORITY:	return "Exposure, Dynamic Framerate";
-	case V4L2_CID_PAN_RELATIVE:		return "Pan, Relative";
-	case V4L2_CID_TILT_RELATIVE:		return "Tilt, Relative";
-	case V4L2_CID_PAN_RESET:		return "Pan, Reset";
-	case V4L2_CID_TILT_RESET:		return "Tilt, Reset";
-	case V4L2_CID_PAN_ABSOLUTE:		return "Pan, Absolute";
-	case V4L2_CID_TILT_ABSOLUTE:		return "Tilt, Absolute";
-	case V4L2_CID_FOCUS_ABSOLUTE:		return "Focus, Absolute";
-	case V4L2_CID_FOCUS_RELATIVE:		return "Focus, Relative";
-	case V4L2_CID_FOCUS_AUTO:		return "Focus, Automatic";
-	case V4L2_CID_IRIS_ABSOLUTE:		return "Iris, Absolute";
-	case V4L2_CID_IRIS_RELATIVE:		return "Iris, Relative";
-	case V4L2_CID_ZOOM_ABSOLUTE:		return "Zoom, Absolute";
-	case V4L2_CID_ZOOM_RELATIVE:		return "Zoom, Relative";
-	case V4L2_CID_ZOOM_CONTINUOUS:		return "Zoom, Continuous";
-	case V4L2_CID_PRIVACY:			return "Privacy";
-
-	/* FM Radio Modulator control */
-	case V4L2_CID_FM_TX_CLASS:		return "FM Radio Modulator Controls";
-	case V4L2_CID_RDS_TX_DEVIATION:		return "RDS Signal Deviation";
-	case V4L2_CID_RDS_TX_PI:		return "RDS Program ID";
-	case V4L2_CID_RDS_TX_PTY:		return "RDS Program Type";
-	case V4L2_CID_RDS_TX_PS_NAME:		return "RDS PS Name";
-	case V4L2_CID_RDS_TX_RADIO_TEXT:	return "RDS Radio Text";
-	case V4L2_CID_AUDIO_LIMITER_ENABLED:	return "Audio Limiter Feature Enabled";
-	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
-	case V4L2_CID_AUDIO_LIMITER_DEVIATION:	return "Audio Limiter Deviation";
-	case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
-	case V4L2_CID_AUDIO_COMPRESSION_GAIN:	return "Audio Compression Gain";
-	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
-	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
-	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
-	case V4L2_CID_PILOT_TONE_ENABLED:	return "Pilot Tone Feature Enabled";
-	case V4L2_CID_PILOT_TONE_DEVIATION:	return "Pilot Tone Deviation";
-	case V4L2_CID_PILOT_TONE_FREQUENCY:	return "Pilot Tone Frequency";
-	case V4L2_CID_TUNE_PREEMPHASIS:	return "Pre-emphasis settings";
-	case V4L2_CID_TUNE_POWER_LEVEL:		return "Tune Power Level";
-	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:	return "Tune Antenna Capacitor";
-
-	default:
-		return NULL;
-	}
-}
-EXPORT_SYMBOL(v4l2_ctrl_get_name);
-
 /* Fill in a struct v4l2_queryctrl */
 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def)
 {
-	const char *name = v4l2_ctrl_get_name(qctrl->id);
+	const char *name;
+
+	v4l2_ctrl_fill(qctrl->id, &name, &qctrl->type,
+		       &min, &max, &step, &def, &qctrl->flags);
 
-	qctrl->flags = 0;
 	if (name == NULL)
 		return -EINVAL;
 
-	switch (qctrl->id) {
-	case V4L2_CID_AUDIO_MUTE:
-	case V4L2_CID_AUDIO_LOUDNESS:
-	case V4L2_CID_AUTO_WHITE_BALANCE:
-	case V4L2_CID_AUTOGAIN:
-	case V4L2_CID_HFLIP:
-	case V4L2_CID_VFLIP:
-	case V4L2_CID_HUE_AUTO:
-	case V4L2_CID_CHROMA_AGC:
-	case V4L2_CID_COLOR_KILLER:
-	case V4L2_CID_MPEG_AUDIO_MUTE:
-	case V4L2_CID_MPEG_VIDEO_MUTE:
-	case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
-	case V4L2_CID_MPEG_VIDEO_PULLDOWN:
-	case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
-	case V4L2_CID_FOCUS_AUTO:
-	case V4L2_CID_PRIVACY:
-	case V4L2_CID_AUDIO_LIMITER_ENABLED:
-	case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
-	case V4L2_CID_PILOT_TONE_ENABLED:
-		qctrl->type = V4L2_CTRL_TYPE_BOOLEAN;
-		min = 0;
-		max = step = 1;
-		break;
-	case V4L2_CID_PAN_RESET:
-	case V4L2_CID_TILT_RESET:
-		qctrl->type = V4L2_CTRL_TYPE_BUTTON;
-		qctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
-		min = max = step = def = 0;
-		break;
-	case V4L2_CID_POWER_LINE_FREQUENCY:
-	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
-	case V4L2_CID_MPEG_AUDIO_ENCODING:
-	case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
-	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
-	case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
-	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
-	case V4L2_CID_MPEG_AUDIO_MODE:
-	case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
-	case V4L2_CID_MPEG_AUDIO_EMPHASIS:
-	case V4L2_CID_MPEG_AUDIO_CRC:
-	case V4L2_CID_MPEG_VIDEO_ENCODING:
-	case V4L2_CID_MPEG_VIDEO_ASPECT:
-	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
-	case V4L2_CID_MPEG_STREAM_TYPE:
-	case V4L2_CID_MPEG_STREAM_VBI_FMT:
-	case V4L2_CID_EXPOSURE_AUTO:
-	case V4L2_CID_COLORFX:
-	case V4L2_CID_TUNE_PREEMPHASIS:
-		qctrl->type = V4L2_CTRL_TYPE_MENU;
-		step = 1;
-		break;
-	case V4L2_CID_RDS_TX_PS_NAME:
-	case V4L2_CID_RDS_TX_RADIO_TEXT:
-		qctrl->type = V4L2_CTRL_TYPE_STRING;
-		break;
-	case V4L2_CID_USER_CLASS:
-	case V4L2_CID_CAMERA_CLASS:
-	case V4L2_CID_MPEG_CLASS:
-	case V4L2_CID_FM_TX_CLASS:
-		qctrl->type = V4L2_CTRL_TYPE_CTRL_CLASS;
-		qctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
-		min = max = step = def = 0;
-		break;
-	case V4L2_CID_BG_COLOR:
-		qctrl->type = V4L2_CTRL_TYPE_INTEGER;
-		step = 1;
-		min = 0;
-		/* Max is calculated as RGB888 that is 2^24 */
-		max = 0xFFFFFF;
-		break;
-	default:
-		qctrl->type = V4L2_CTRL_TYPE_INTEGER;
-		break;
-	}
-	switch (qctrl->id) {
-	case V4L2_CID_MPEG_AUDIO_ENCODING:
-	case V4L2_CID_MPEG_AUDIO_MODE:
-	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
-	case V4L2_CID_MPEG_VIDEO_B_FRAMES:
-	case V4L2_CID_MPEG_STREAM_TYPE:
-		qctrl->flags |= V4L2_CTRL_FLAG_UPDATE;
-		break;
-	case V4L2_CID_AUDIO_VOLUME:
-	case V4L2_CID_AUDIO_BALANCE:
-	case V4L2_CID_AUDIO_BASS:
-	case V4L2_CID_AUDIO_TREBLE:
-	case V4L2_CID_BRIGHTNESS:
-	case V4L2_CID_CONTRAST:
-	case V4L2_CID_SATURATION:
-	case V4L2_CID_HUE:
-	case V4L2_CID_RED_BALANCE:
-	case V4L2_CID_BLUE_BALANCE:
-	case V4L2_CID_GAMMA:
-	case V4L2_CID_SHARPNESS:
-	case V4L2_CID_CHROMA_GAIN:
-	case V4L2_CID_RDS_TX_DEVIATION:
-	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
-	case V4L2_CID_AUDIO_LIMITER_DEVIATION:
-	case V4L2_CID_AUDIO_COMPRESSION_GAIN:
-	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
-	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
-	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
-	case V4L2_CID_PILOT_TONE_DEVIATION:
-	case V4L2_CID_PILOT_TONE_FREQUENCY:
-	case V4L2_CID_TUNE_POWER_LEVEL:
-	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
-		qctrl->flags |= V4L2_CTRL_FLAG_SLIDER;
-		break;
-	case V4L2_CID_PAN_RELATIVE:
-	case V4L2_CID_TILT_RELATIVE:
-	case V4L2_CID_FOCUS_RELATIVE:
-	case V4L2_CID_IRIS_RELATIVE:
-	case V4L2_CID_ZOOM_RELATIVE:
-		qctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
-		break;
-	}
 	qctrl->minimum = min;
 	qctrl->maximum = max;
 	qctrl->step = step;
diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
new file mode 100644
index 0000000..6c97ff0
--- /dev/null
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -0,0 +1,1840 @@
+/*
+    V4L2 controls framework implementation.
+
+    Copyright (C) 2010  Hans Verkuil <hverkuil@xs4all.nl>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/ctype.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-dev.h>
+
+/* Internal temporary helper struct, one for each v4l2_ext_control */
+struct ctrl_helper {
+	/* The control corresponding to the v4l2_ext_control ID field. */
+	struct v4l2_ctrl *ctrl;
+	/* Used internally to mark whether this control was already
+	   processed. */
+	bool handled;
+};
+
+/* Returns NULL or a character pointer array containing the menu for
+   the given control ID. The pointer array ends with a NULL pointer.
+   An empty string signifies a menu entry that is invalid. This allows
+   drivers to disable certain options if it is not supported. */
+const char **v4l2_ctrl_get_menu(u32 id)
+{
+	static const char *mpeg_audio_sampling_freq[] = {
+		"44.1 kHz",
+		"48 kHz",
+		"32 kHz",
+		NULL
+	};
+	static const char *mpeg_audio_encoding[] = {
+		"MPEG-1/2 Layer I",
+		"MPEG-1/2 Layer II",
+		"MPEG-1/2 Layer III",
+		"MPEG-2/4 AAC",
+		"AC-3",
+		NULL
+	};
+	static const char *mpeg_audio_l1_bitrate[] = {
+		"32 kbps",
+		"64 kbps",
+		"96 kbps",
+		"128 kbps",
+		"160 kbps",
+		"192 kbps",
+		"224 kbps",
+		"256 kbps",
+		"288 kbps",
+		"320 kbps",
+		"352 kbps",
+		"384 kbps",
+		"416 kbps",
+		"448 kbps",
+		NULL
+	};
+	static const char *mpeg_audio_l2_bitrate[] = {
+		"32 kbps",
+		"48 kbps",
+		"56 kbps",
+		"64 kbps",
+		"80 kbps",
+		"96 kbps",
+		"112 kbps",
+		"128 kbps",
+		"160 kbps",
+		"192 kbps",
+		"224 kbps",
+		"256 kbps",
+		"320 kbps",
+		"384 kbps",
+		NULL
+	};
+	static const char *mpeg_audio_l3_bitrate[] = {
+		"32 kbps",
+		"40 kbps",
+		"48 kbps",
+		"56 kbps",
+		"64 kbps",
+		"80 kbps",
+		"96 kbps",
+		"112 kbps",
+		"128 kbps",
+		"160 kbps",
+		"192 kbps",
+		"224 kbps",
+		"256 kbps",
+		"320 kbps",
+		NULL
+	};
+	static const char *mpeg_audio_ac3_bitrate[] = {
+		"32 kbps",
+		"40 kbps",
+		"48 kbps",
+		"56 kbps",
+		"64 kbps",
+		"80 kbps",
+		"96 kbps",
+		"112 kbps",
+		"128 kbps",
+		"160 kbps",
+		"192 kbps",
+		"224 kbps",
+		"256 kbps",
+		"320 kbps",
+		"384 kbps",
+		"448 kbps",
+		"512 kbps",
+		"576 kbps",
+		"640 kbps",
+		NULL
+	};
+	static const char *mpeg_audio_mode[] = {
+		"Stereo",
+		"Joint Stereo",
+		"Dual",
+		"Mono",
+		NULL
+	};
+	static const char *mpeg_audio_mode_extension[] = {
+		"Bound 4",
+		"Bound 8",
+		"Bound 12",
+		"Bound 16",
+		NULL
+	};
+	static const char *mpeg_audio_emphasis[] = {
+		"No Emphasis",
+		"50/15 us",
+		"CCITT J17",
+		NULL
+	};
+	static const char *mpeg_audio_crc[] = {
+		"No CRC",
+		"16-bit CRC",
+		NULL
+	};
+	static const char *mpeg_video_encoding[] = {
+		"MPEG-1",
+		"MPEG-2",
+		"MPEG-4 AVC",
+		NULL
+	};
+	static const char *mpeg_video_aspect[] = {
+		"1x1",
+		"4x3",
+		"16x9",
+		"2.21x1",
+		NULL
+	};
+	static const char *mpeg_video_bitrate_mode[] = {
+		"Variable Bitrate",
+		"Constant Bitrate",
+		NULL
+	};
+	static const char *mpeg_stream_type[] = {
+		"MPEG-2 Program Stream",
+		"MPEG-2 Transport Stream",
+		"MPEG-1 System Stream",
+		"MPEG-2 DVD-compatible Stream",
+		"MPEG-1 VCD-compatible Stream",
+		"MPEG-2 SVCD-compatible Stream",
+		NULL
+	};
+	static const char *mpeg_stream_vbi_fmt[] = {
+		"No VBI",
+		"Private packet, IVTV format",
+		NULL
+	};
+	static const char *camera_power_line_frequency[] = {
+		"Disabled",
+		"50 Hz",
+		"60 Hz",
+		NULL
+	};
+	static const char *camera_exposure_auto[] = {
+		"Auto Mode",
+		"Manual Mode",
+		"Shutter Priority Mode",
+		"Aperture Priority Mode",
+		NULL
+	};
+	static const char *colorfx[] = {
+		"None",
+		"Black & White",
+		"Sepia",
+		"Negative",
+		"Emboss",
+		"Sketch",
+		"Sky blue",
+		"Grass green",
+		"Skin whiten",
+		"Vivid",
+		NULL
+	};
+	static const char *tune_preemphasis[] = {
+		"No preemphasis",
+		"50 useconds",
+		"75 useconds",
+		NULL,
+	};
+
+	switch (id) {
+	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
+		return mpeg_audio_sampling_freq;
+	case V4L2_CID_MPEG_AUDIO_ENCODING:
+		return mpeg_audio_encoding;
+	case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
+		return mpeg_audio_l1_bitrate;
+	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
+		return mpeg_audio_l2_bitrate;
+	case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
+		return mpeg_audio_l3_bitrate;
+	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
+		return mpeg_audio_ac3_bitrate;
+	case V4L2_CID_MPEG_AUDIO_MODE:
+		return mpeg_audio_mode;
+	case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
+		return mpeg_audio_mode_extension;
+	case V4L2_CID_MPEG_AUDIO_EMPHASIS:
+		return mpeg_audio_emphasis;
+	case V4L2_CID_MPEG_AUDIO_CRC:
+		return mpeg_audio_crc;
+	case V4L2_CID_MPEG_VIDEO_ENCODING:
+		return mpeg_video_encoding;
+	case V4L2_CID_MPEG_VIDEO_ASPECT:
+		return mpeg_video_aspect;
+	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
+		return mpeg_video_bitrate_mode;
+	case V4L2_CID_MPEG_STREAM_TYPE:
+		return mpeg_stream_type;
+	case V4L2_CID_MPEG_STREAM_VBI_FMT:
+		return mpeg_stream_vbi_fmt;
+	case V4L2_CID_POWER_LINE_FREQUENCY:
+		return camera_power_line_frequency;
+	case V4L2_CID_EXPOSURE_AUTO:
+		return camera_exposure_auto;
+	case V4L2_CID_COLORFX:
+		return colorfx;
+	case V4L2_CID_TUNE_PREEMPHASIS:
+		return tune_preemphasis;
+	default:
+		return NULL;
+	}
+}
+EXPORT_SYMBOL(v4l2_ctrl_get_menu);
+
+/* Return the control name. */
+const char *v4l2_ctrl_get_name(u32 id)
+{
+	switch (id) {
+	/* USER controls */
+	case V4L2_CID_USER_CLASS: 		return "User Controls";
+	case V4L2_CID_BRIGHTNESS: 		return "Brightness";
+	case V4L2_CID_CONTRAST: 		return "Contrast";
+	case V4L2_CID_SATURATION: 		return "Saturation";
+	case V4L2_CID_HUE: 			return "Hue";
+	case V4L2_CID_AUDIO_VOLUME: 		return "Volume";
+	case V4L2_CID_AUDIO_BALANCE: 		return "Balance";
+	case V4L2_CID_AUDIO_BASS: 		return "Bass";
+	case V4L2_CID_AUDIO_TREBLE: 		return "Treble";
+	case V4L2_CID_AUDIO_MUTE: 		return "Mute";
+	case V4L2_CID_AUDIO_LOUDNESS: 		return "Loudness";
+	case V4L2_CID_BLACK_LEVEL:		return "Black Level";
+	case V4L2_CID_AUTO_WHITE_BALANCE:	return "White Balance, Automatic";
+	case V4L2_CID_DO_WHITE_BALANCE:		return "Do White Balance";
+	case V4L2_CID_RED_BALANCE:		return "Red Balance";
+	case V4L2_CID_BLUE_BALANCE:		return "Blue Balance";
+	case V4L2_CID_GAMMA:			return "Gamma";
+	case V4L2_CID_EXPOSURE:			return "Exposure";
+	case V4L2_CID_AUTOGAIN:			return "Gain, Automatic";
+	case V4L2_CID_GAIN:			return "Gain";
+	case V4L2_CID_HFLIP:			return "Horizontal Flip";
+	case V4L2_CID_VFLIP:			return "Vertical Flip";
+	case V4L2_CID_HCENTER:			return "Horizontal Center";
+	case V4L2_CID_VCENTER:			return "Vertical Center";
+	case V4L2_CID_POWER_LINE_FREQUENCY:	return "Power Line Frequency";
+	case V4L2_CID_HUE_AUTO:			return "Hue, Automatic";
+	case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
+	case V4L2_CID_SHARPNESS:		return "Sharpness";
+	case V4L2_CID_BACKLIGHT_COMPENSATION:	return "Backlight Compensation";
+	case V4L2_CID_CHROMA_AGC:		return "Chroma AGC";
+	case V4L2_CID_CHROMA_GAIN:		return "Chroma Gain";
+	case V4L2_CID_COLOR_KILLER:		return "Color Killer";
+	case V4L2_CID_COLORFX:			return "Color Effects";
+	case V4L2_CID_AUTOBRIGHTNESS:		return "Brightness, Automatic";
+	case V4L2_CID_BAND_STOP_FILTER:		return "Band-Stop Filter";
+	case V4L2_CID_ROTATE:			return "Rotate";
+	case V4L2_CID_BG_COLOR:			return "Background Color";
+
+	/* MPEG controls */
+	case V4L2_CID_MPEG_CLASS: 		return "MPEG Encoder Controls";
+	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
+	case V4L2_CID_MPEG_AUDIO_ENCODING: 	return "Audio Encoding";
+	case V4L2_CID_MPEG_AUDIO_L1_BITRATE: 	return "Audio Layer I Bitrate";
+	case V4L2_CID_MPEG_AUDIO_L2_BITRATE: 	return "Audio Layer II Bitrate";
+	case V4L2_CID_MPEG_AUDIO_L3_BITRATE: 	return "Audio Layer III Bitrate";
+	case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: 	return "Audio AAC Bitrate";
+	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: 	return "Audio AC-3 Bitrate";
+	case V4L2_CID_MPEG_AUDIO_MODE: 		return "Audio Stereo Mode";
+	case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
+	case V4L2_CID_MPEG_AUDIO_EMPHASIS: 	return "Audio Emphasis";
+	case V4L2_CID_MPEG_AUDIO_CRC: 		return "Audio CRC";
+	case V4L2_CID_MPEG_AUDIO_MUTE: 		return "Audio Mute";
+	case V4L2_CID_MPEG_VIDEO_ENCODING: 	return "Video Encoding";
+	case V4L2_CID_MPEG_VIDEO_ASPECT: 	return "Video Aspect";
+	case V4L2_CID_MPEG_VIDEO_B_FRAMES: 	return "Video B Frames";
+	case V4L2_CID_MPEG_VIDEO_GOP_SIZE: 	return "Video GOP Size";
+	case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: 	return "Video GOP Closure";
+	case V4L2_CID_MPEG_VIDEO_PULLDOWN: 	return "Video Pulldown";
+	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: 	return "Video Bitrate Mode";
+	case V4L2_CID_MPEG_VIDEO_BITRATE: 	return "Video Bitrate";
+	case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: 	return "Video Peak Bitrate";
+	case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
+	case V4L2_CID_MPEG_VIDEO_MUTE: 		return "Video Mute";
+	case V4L2_CID_MPEG_VIDEO_MUTE_YUV:	return "Video Mute YUV";
+	case V4L2_CID_MPEG_STREAM_TYPE: 	return "Stream Type";
+	case V4L2_CID_MPEG_STREAM_PID_PMT: 	return "Stream PMT Program ID";
+	case V4L2_CID_MPEG_STREAM_PID_AUDIO: 	return "Stream Audio Program ID";
+	case V4L2_CID_MPEG_STREAM_PID_VIDEO: 	return "Stream Video Program ID";
+	case V4L2_CID_MPEG_STREAM_PID_PCR: 	return "Stream PCR Program ID";
+	case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
+	case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
+	case V4L2_CID_MPEG_STREAM_VBI_FMT:	return "Stream VBI Format";
+
+	/* CAMERA controls */
+	case V4L2_CID_CAMERA_CLASS:		return "Camera Controls";
+	case V4L2_CID_EXPOSURE_AUTO:		return "Auto Exposure";
+	case V4L2_CID_EXPOSURE_ABSOLUTE:	return "Exposure Time, Absolute";
+	case V4L2_CID_EXPOSURE_AUTO_PRIORITY:	return "Exposure, Dynamic Framerate";
+	case V4L2_CID_PAN_RELATIVE:		return "Pan, Relative";
+	case V4L2_CID_TILT_RELATIVE:		return "Tilt, Relative";
+	case V4L2_CID_PAN_RESET:		return "Pan, Reset";
+	case V4L2_CID_TILT_RESET:		return "Tilt, Reset";
+	case V4L2_CID_PAN_ABSOLUTE:		return "Pan, Absolute";
+	case V4L2_CID_TILT_ABSOLUTE:		return "Tilt, Absolute";
+	case V4L2_CID_FOCUS_ABSOLUTE:		return "Focus, Absolute";
+	case V4L2_CID_FOCUS_RELATIVE:		return "Focus, Relative";
+	case V4L2_CID_FOCUS_AUTO:		return "Focus, Automatic";
+	case V4L2_CID_IRIS_ABSOLUTE:		return "Iris, Absolute";
+	case V4L2_CID_IRIS_RELATIVE:		return "Iris, Relative";
+	case V4L2_CID_ZOOM_ABSOLUTE:		return "Zoom, Absolute";
+	case V4L2_CID_ZOOM_RELATIVE:		return "Zoom, Relative";
+	case V4L2_CID_ZOOM_CONTINUOUS:		return "Zoom, Continuous";
+	case V4L2_CID_PRIVACY:			return "Privacy";
+
+	/* FM Radio Modulator control */
+	case V4L2_CID_FM_TX_CLASS:		return "FM Radio Modulator Controls";
+	case V4L2_CID_RDS_TX_DEVIATION:		return "RDS Signal Deviation";
+	case V4L2_CID_RDS_TX_PI:		return "RDS Program ID";
+	case V4L2_CID_RDS_TX_PTY:		return "RDS Program Type";
+	case V4L2_CID_RDS_TX_PS_NAME:		return "RDS PS Name";
+	case V4L2_CID_RDS_TX_RADIO_TEXT:	return "RDS Radio Text";
+	case V4L2_CID_AUDIO_LIMITER_ENABLED:	return "Audio Limiter Feature Enabled";
+	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
+	case V4L2_CID_AUDIO_LIMITER_DEVIATION:	return "Audio Limiter Deviation";
+	case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
+	case V4L2_CID_AUDIO_COMPRESSION_GAIN:	return "Audio Compression Gain";
+	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
+	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
+	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
+	case V4L2_CID_PILOT_TONE_ENABLED:	return "Pilot Tone Feature Enabled";
+	case V4L2_CID_PILOT_TONE_DEVIATION:	return "Pilot Tone Deviation";
+	case V4L2_CID_PILOT_TONE_FREQUENCY:	return "Pilot Tone Frequency";
+	case V4L2_CID_TUNE_PREEMPHASIS:		return "Pre-emphasis settings";
+	case V4L2_CID_TUNE_POWER_LEVEL:		return "Tune Power Level";
+	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:	return "Tune Antenna Capacitor";
+
+	default:
+		return NULL;
+	}
+}
+EXPORT_SYMBOL(v4l2_ctrl_get_name);
+
+void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
+		    s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags)
+{
+	*name = v4l2_ctrl_get_name(id);
+	*flags = 0;
+
+	switch (id) {
+	case V4L2_CID_AUDIO_MUTE:
+	case V4L2_CID_AUDIO_LOUDNESS:
+	case V4L2_CID_AUTO_WHITE_BALANCE:
+	case V4L2_CID_AUTOGAIN:
+	case V4L2_CID_HFLIP:
+	case V4L2_CID_VFLIP:
+	case V4L2_CID_HUE_AUTO:
+	case V4L2_CID_CHROMA_AGC:
+	case V4L2_CID_COLOR_KILLER:
+	case V4L2_CID_MPEG_AUDIO_MUTE:
+	case V4L2_CID_MPEG_VIDEO_MUTE:
+	case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
+	case V4L2_CID_MPEG_VIDEO_PULLDOWN:
+	case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
+	case V4L2_CID_FOCUS_AUTO:
+	case V4L2_CID_PRIVACY:
+	case V4L2_CID_AUDIO_LIMITER_ENABLED:
+	case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
+	case V4L2_CID_PILOT_TONE_ENABLED:
+		*type = V4L2_CTRL_TYPE_BOOLEAN;
+		*min = 0;
+		*max = *step = 1;
+		break;
+	case V4L2_CID_PAN_RESET:
+	case V4L2_CID_TILT_RESET:
+		*type = V4L2_CTRL_TYPE_BUTTON;
+		*flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
+		*min = *max = *step = *def = 0;
+		break;
+	case V4L2_CID_POWER_LINE_FREQUENCY:
+	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
+	case V4L2_CID_MPEG_AUDIO_ENCODING:
+	case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
+	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
+	case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
+	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
+	case V4L2_CID_MPEG_AUDIO_MODE:
+	case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
+	case V4L2_CID_MPEG_AUDIO_EMPHASIS:
+	case V4L2_CID_MPEG_AUDIO_CRC:
+	case V4L2_CID_MPEG_VIDEO_ENCODING:
+	case V4L2_CID_MPEG_VIDEO_ASPECT:
+	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
+	case V4L2_CID_MPEG_STREAM_TYPE:
+	case V4L2_CID_MPEG_STREAM_VBI_FMT:
+	case V4L2_CID_EXPOSURE_AUTO:
+	case V4L2_CID_COLORFX:
+	case V4L2_CID_TUNE_PREEMPHASIS:
+		*type = V4L2_CTRL_TYPE_MENU;
+		break;
+	case V4L2_CID_RDS_TX_PS_NAME:
+	case V4L2_CID_RDS_TX_RADIO_TEXT:
+		*type = V4L2_CTRL_TYPE_STRING;
+		break;
+	case V4L2_CID_USER_CLASS:
+	case V4L2_CID_CAMERA_CLASS:
+	case V4L2_CID_MPEG_CLASS:
+	case V4L2_CID_FM_TX_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;
+		*min = *max = *step = *def = 0;
+		break;
+	case V4L2_CID_BG_COLOR:
+		*type = V4L2_CTRL_TYPE_INTEGER;
+		*step = 1;
+		*min = 0;
+		/* Max is calculated as RGB888 that is 2^24 */
+		*max = 0xFFFFFF;
+		break;
+	default:
+		*type = V4L2_CTRL_TYPE_INTEGER;
+		break;
+	}
+	switch (id) {
+	case V4L2_CID_MPEG_AUDIO_ENCODING:
+	case V4L2_CID_MPEG_AUDIO_MODE:
+	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
+	case V4L2_CID_MPEG_VIDEO_B_FRAMES:
+	case V4L2_CID_MPEG_STREAM_TYPE:
+		*flags |= V4L2_CTRL_FLAG_UPDATE;
+		break;
+	case V4L2_CID_AUDIO_VOLUME:
+	case V4L2_CID_AUDIO_BALANCE:
+	case V4L2_CID_AUDIO_BASS:
+	case V4L2_CID_AUDIO_TREBLE:
+	case V4L2_CID_BRIGHTNESS:
+	case V4L2_CID_CONTRAST:
+	case V4L2_CID_SATURATION:
+	case V4L2_CID_HUE:
+	case V4L2_CID_RED_BALANCE:
+	case V4L2_CID_BLUE_BALANCE:
+	case V4L2_CID_GAMMA:
+	case V4L2_CID_SHARPNESS:
+	case V4L2_CID_CHROMA_GAIN:
+	case V4L2_CID_RDS_TX_DEVIATION:
+	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
+	case V4L2_CID_AUDIO_LIMITER_DEVIATION:
+	case V4L2_CID_AUDIO_COMPRESSION_GAIN:
+	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
+	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
+	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
+	case V4L2_CID_PILOT_TONE_DEVIATION:
+	case V4L2_CID_PILOT_TONE_FREQUENCY:
+	case V4L2_CID_TUNE_POWER_LEVEL:
+	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
+		*flags |= V4L2_CTRL_FLAG_SLIDER;
+		break;
+	case V4L2_CID_PAN_RELATIVE:
+	case V4L2_CID_TILT_RELATIVE:
+	case V4L2_CID_FOCUS_RELATIVE:
+	case V4L2_CID_IRIS_RELATIVE:
+	case V4L2_CID_ZOOM_RELATIVE:
+		*flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
+		break;
+	}
+}
+EXPORT_SYMBOL(v4l2_ctrl_fill);
+
+/* Helper function to determine whether the control type is compatible with
+   VIDIOC_G/S_CTRL. */
+static bool type_is_int(const struct v4l2_ctrl *ctrl)
+{
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_INTEGER64:
+	case V4L2_CTRL_TYPE_STRING:
+		/* Nope, these need v4l2_ext_control */
+		return false;
+	default:
+		return true;
+	}
+}
+
+/* Helper function: copy the current control value back to the caller */
+static int cur_to_user(struct v4l2_ext_control *c,
+		       struct v4l2_ctrl *ctrl)
+{
+	u32 len;
+
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_STRING:
+		len = strlen(ctrl->cur.string);
+		if (c->size < len + 1) {
+			c->size = len + 1;
+			return -ENOSPC;
+		}
+		return copy_to_user(c->string, ctrl->cur.string,
+						len + 1) ? -EFAULT : 0;
+	case V4L2_CTRL_TYPE_INTEGER64:
+		c->value64 = ctrl->cur.val64;
+		break;
+	default:
+		c->value = ctrl->cur.val;
+		break;
+	}
+	return 0;
+}
+
+/* Helper function: copy the caller-provider value as the new control value */
+static int user_to_new(struct v4l2_ext_control *c,
+		       struct v4l2_ctrl *ctrl)
+{
+	int ret;
+	u32 size;
+
+	ctrl->has_new = 1;
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_INTEGER64:
+		ctrl->val64 = c->value64;
+		break;
+	case V4L2_CTRL_TYPE_STRING:
+		size = c->size;
+		if (size == 0)
+			return -ERANGE;
+		if (size > ctrl->maximum + 1)
+			size = ctrl->maximum + 1;
+		ret = copy_from_user(ctrl->string, c->string, size);
+		if (!ret) {
+			char last = ctrl->string[size - 1];
+
+			ctrl->string[size - 1] = 0;
+			/* If the string was longer than ctrl->maximum,
+			   then return an error. */
+			if (strlen(ctrl->string) == ctrl->maximum && last)
+				return -ERANGE;
+		}
+		return ret ? -EFAULT : 0;
+	default:
+		ctrl->val = c->value;
+		break;
+	}
+	return 0;
+}
+
+/* Helper function: copy the new control value back to the caller */
+static int new_to_user(struct v4l2_ext_control *c,
+		       struct v4l2_ctrl *ctrl)
+{
+	u32 len;
+
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_STRING:
+		len = strlen(ctrl->string);
+		if (c->size < len + 1) {
+			c->size = ctrl->maximum + 1;
+			return -ENOSPC;
+		}
+		return copy_to_user(c->string, ctrl->string,
+						len + 1) ? -EFAULT : 0;
+	case V4L2_CTRL_TYPE_INTEGER64:
+		c->value64 = ctrl->val64;
+		break;
+	default:
+		c->value = ctrl->val;
+		break;
+	}
+	return 0;
+}
+
+/* Copy the new value to the current value. */
+static void new_to_cur(struct v4l2_ctrl *ctrl)
+{
+	if (ctrl == NULL)
+		return;
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_STRING:
+		/* strings are always 0-terminated */
+		strcpy(ctrl->cur.string, ctrl->string);
+		break;
+	case V4L2_CTRL_TYPE_INTEGER64:
+		ctrl->cur.val64 = ctrl->val64;
+		break;
+	default:
+		ctrl->cur.val = ctrl->val;
+		break;
+	}
+}
+
+/* Copy the current value to the new value */
+static void cur_to_new(struct v4l2_ctrl *ctrl)
+{
+	if (ctrl == NULL)
+		return;
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_STRING:
+		/* strings are always 0-terminated */
+		strcpy(ctrl->string, ctrl->cur.string);
+		break;
+	case V4L2_CTRL_TYPE_INTEGER64:
+		ctrl->val64 = ctrl->cur.val64;
+		break;
+	default:
+		ctrl->val = ctrl->cur.val;
+		break;
+	}
+}
+
+/* Return non-zero if one or more of the controls in the cluster has a new
+   value that differs from the current value. */
+static int cluster_changed(struct v4l2_ctrl *master)
+{
+	int diff = 0;
+	int i;
+
+	for (i = 0; !diff && i < master->ncontrols; i++) {
+		struct v4l2_ctrl *ctrl = master->cluster[i];
+
+		if (ctrl == NULL)
+			continue;
+		switch (ctrl->type) {
+		case V4L2_CTRL_TYPE_BUTTON:
+			/* Button controls are always 'different' */
+			return 1;
+		case V4L2_CTRL_TYPE_STRING:
+			/* strings are always 0-terminated */
+			diff = strcmp(ctrl->string, ctrl->cur.string);
+			break;
+		case V4L2_CTRL_TYPE_INTEGER64:
+			diff = ctrl->val64 != ctrl->cur.val64;
+			break;
+		default:
+			diff = ctrl->val != ctrl->cur.val;
+			break;
+		}
+	}
+	return diff;
+}
+
+/* Validate a new control */
+static int validate_new(struct v4l2_ctrl *ctrl)
+{
+	s32 val = ctrl->val;
+	char *s = ctrl->string;
+	u32 offset;
+	size_t len;
+
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_INTEGER:
+		/* Round towards the closest legal value */
+		val += ctrl->step / 2;
+		if (val < ctrl->minimum)
+			val = ctrl->minimum;
+		if (val > ctrl->maximum)
+			val = ctrl->maximum;
+		offset = val - ctrl->minimum;
+		offset = ctrl->step * (offset / ctrl->step);
+		val = ctrl->minimum + offset;
+		ctrl->val = val;
+		return 0;
+
+	case V4L2_CTRL_TYPE_BOOLEAN:
+		ctrl->val = !!ctrl->val;
+		return 0;
+
+	case V4L2_CTRL_TYPE_MENU:
+		if (val < ctrl->minimum || val > ctrl->maximum)
+			return -ERANGE;
+		if (ctrl->qmenu[val][0] == '\0' ||
+		    (ctrl->menu_skip_mask & (1 << val)))
+			return -EINVAL;
+		return 0;
+
+	case V4L2_CTRL_TYPE_BUTTON:
+	case V4L2_CTRL_TYPE_CTRL_CLASS:
+		ctrl->val64 = 0;
+		return 0;
+
+	case V4L2_CTRL_TYPE_INTEGER64:
+		return 0;
+
+	case V4L2_CTRL_TYPE_STRING:
+		len = strlen(s);
+		if (len < ctrl->minimum)
+			return -ERANGE;
+		if ((len - ctrl->minimum) % ctrl->step)
+			return -ERANGE;
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static inline u32 node2id(struct list_head *node)
+{
+	return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id;
+}
+
+/* Set the handler's error code if it wasn't set earlier already */
+static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err)
+{
+	if (hdl->error == 0)
+		hdl->error = err;
+	return err;
+}
+
+/* Initialize the handler */
+int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
+			   unsigned nr_of_controls_hint)
+{
+	mutex_init(&hdl->lock);
+	INIT_LIST_HEAD(&hdl->ctrls);
+	INIT_LIST_HEAD(&hdl->ctrl_refs);
+	hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8;
+	hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets,
+								GFP_KERNEL);
+	hdl->error = hdl->buckets ? 0 : -ENOMEM;
+	return hdl->error;
+}
+EXPORT_SYMBOL(v4l2_ctrl_handler_init);
+
+/* Free all controls and control refs */
+void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl)
+{
+	struct v4l2_ctrl_ref *ref, *next_ref;
+	struct v4l2_ctrl *ctrl, *next_ctrl;
+
+	if (hdl == NULL || hdl->buckets == NULL)
+		return;
+
+	mutex_lock(&hdl->lock);
+	/* Free all nodes */
+	list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) {
+		list_del(&ref->node);
+		kfree(ref);
+	}
+	/* Free all controls owned by the handler */
+	list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) {
+		list_del(&ctrl->node);
+		kfree(ctrl);
+	}
+	kfree(hdl->buckets);
+	hdl->buckets = NULL;
+	hdl->cached = NULL;
+	hdl->error = 0;
+	mutex_unlock(&hdl->lock);
+}
+EXPORT_SYMBOL(v4l2_ctrl_handler_free);
+
+/* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer
+   be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing
+   with applications that do not use the NEXT_CTRL flag.
+
+   We just find the n-th private user control. It's O(N), but that should not
+   be an issue in this particular case. */
+static struct v4l2_ctrl_ref *find_private_ref(
+		struct v4l2_ctrl_handler *hdl, u32 id)
+{
+	struct v4l2_ctrl_ref *ref;
+
+	id -= V4L2_CID_PRIVATE_BASE;
+	list_for_each_entry(ref, &hdl->ctrl_refs, node) {
+		/* Search for private user controls that are compatible with
+		   VIDIOC_G/S_CTRL. */
+		if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER &&
+		    V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id) &&
+		    ref->ctrl->ops->init == NULL &&
+		    type_is_int(ref->ctrl)) {
+			if (id == 0)
+				return ref;
+			id--;
+		}
+	}
+	return NULL;
+}
+
+static void v4l2_ctrl_initialize(struct v4l2_ctrl *ctrl)
+{
+	struct v4l2_ctrl *master = ctrl->cluster[0];
+	int i;
+
+	master->ops->init(master);
+	for (i = 0; i < master->ncontrols; i++)
+		master->cluster[i]->initialized = 1;
+}
+
+/* Find a control with the given ID. */
+static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id)
+{
+	struct v4l2_ctrl_ref *ref;
+	int bucket;
+
+	id &= V4L2_CTRL_ID_MASK;
+
+	/* Old-style private controls need special handling */
+	if (id >= V4L2_CID_PRIVATE_BASE)
+		return find_private_ref(hdl, id);
+	bucket = id % hdl->nr_of_buckets;
+
+	/* Simple optimization: cache the last control found */
+	if (hdl->cached && hdl->cached->ctrl->id == id)
+		return hdl->cached;
+
+	/* Not in cache, search the hash */
+	ref = hdl->buckets ? hdl->buckets[bucket] : NULL;
+	while (ref && ref->ctrl->id != id)
+		ref = ref->next;
+
+	if (ref) {
+		if (!ref->ctrl->initialized)
+			v4l2_ctrl_initialize(ref->ctrl);
+		hdl->cached = ref; /* cache it! */
+	}
+	return ref;
+}
+
+/* Find a control with the given ID. Take the handler's lock first. */
+static struct v4l2_ctrl_ref *find_ref_lock(
+		struct v4l2_ctrl_handler *hdl, u32 id)
+{
+	struct v4l2_ctrl_ref *ref = NULL;
+
+	if (hdl) {
+		mutex_lock(&hdl->lock);
+		ref = find_ref(hdl, id);
+		mutex_unlock(&hdl->lock);
+	}
+	return ref;
+}
+
+/* Find a control with the given ID. */
+struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id)
+{
+	struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id);
+
+	return ref ? ref->ctrl : NULL;
+}
+EXPORT_SYMBOL(v4l2_ctrl_find);
+
+/* Allocate a new v4l2_ctrl_ref and hook it into the handler. */
+static int handler_new_ref(struct v4l2_ctrl_handler *hdl,
+			   struct v4l2_ctrl *ctrl)
+{
+	struct v4l2_ctrl_ref *ref;
+	struct v4l2_ctrl_ref *new_ref;
+	u32 id = ctrl->id;
+	u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1;
+	int bucket = id % hdl->nr_of_buckets;	/* which bucket to use */
+
+	/* Automatically add the control class if it is not yet present. */
+	if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL)
+		if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0))
+			return hdl->error;
+
+	if (hdl->error)
+		return hdl->error;
+
+	new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL);
+	if (!new_ref)
+		return handler_set_err(hdl, -ENOMEM);
+	new_ref->ctrl = ctrl;
+	if (ctrl->handler == hdl) {
+		/* By default each control starts in a cluster of its own.
+		   new_ref->ctrl is basically a cluster array with one
+		   element, so that's perfect to use as the cluster pointer.
+		   But only do this for the handler that owns the control. */
+		ctrl->cluster = &new_ref->ctrl;
+		ctrl->ncontrols = 1;
+	}
+
+	INIT_LIST_HEAD(&new_ref->node);
+
+	mutex_lock(&hdl->lock);
+
+	/* Add immediately at the end of the list if the list is empty, or if
+	   the last element in the list has a lower ID.
+	   This ensures that when elements are added in ascending order the
+	   insertion is an O(1) operation. */
+	if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) {
+		list_add_tail(&new_ref->node, &hdl->ctrl_refs);
+		goto insert_in_hash;
+	}
+
+	/* Find insert position in sorted list */
+	list_for_each_entry(ref, &hdl->ctrl_refs, node) {
+		if (ref->ctrl->id < id)
+			continue;
+		/* Don't add duplicates */
+		if (ref->ctrl->id == id) {
+			kfree(new_ref);
+			goto unlock;
+		}
+		list_add(&new_ref->node, ref->node.prev);
+		break;
+	}
+
+insert_in_hash:
+	/* Insert the control node in the hash */
+	new_ref->next = hdl->buckets[bucket];
+	hdl->buckets[bucket] = new_ref;
+
+unlock:
+	mutex_unlock(&hdl->lock);
+	return 0;
+}
+
+/* Add a new control */
+static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_ops *ops,
+			u32 id, const char *name, enum v4l2_ctrl_type type,
+			s32 min, s32 max, u32 step, s32 def,
+			u32 flags, const char **qmenu, void *priv)
+{
+	struct v4l2_ctrl *ctrl;
+	unsigned sz_extra = 0;
+
+	if (hdl->error)
+		return NULL;
+
+	/* Sanity checks */
+	if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE ||
+	    def < min || def > max || max < min ||
+	    (type == V4L2_CTRL_TYPE_INTEGER && step == 0) ||
+	    (type == V4L2_CTRL_TYPE_STRING && max == 0)) {
+		handler_set_err(hdl, -ERANGE);
+		return NULL;
+	}
+
+	if (type == V4L2_CTRL_TYPE_BUTTON)
+		flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
+	else if (type == V4L2_CTRL_TYPE_CTRL_CLASS)
+		flags |= V4L2_CTRL_FLAG_READ_ONLY;
+	else if (type == V4L2_CTRL_TYPE_STRING)
+		sz_extra += 2 * (max + 1);
+
+	ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL);
+	if (ctrl == NULL) {
+		handler_set_err(hdl, -ENOMEM);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&ctrl->node);
+	ctrl->handler = hdl;
+	ctrl->ops = ops;
+	ctrl->id = id;
+	ctrl->name = name;
+	ctrl->type = type;
+	ctrl->flags = flags;
+	ctrl->minimum = min;
+	ctrl->maximum = max;
+	ctrl->step = step;
+	ctrl->qmenu = qmenu;
+	ctrl->priv = priv;
+	ctrl->cur.val = ctrl->val = ctrl->default_value = def;
+	if (!ops || !ops->init)
+		ctrl->initialized = 1;
+
+	if (ctrl->type == V4L2_CTRL_TYPE_STRING) {
+		ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1);
+		ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1);
+		if (ctrl->minimum)
+			memset(ctrl->cur.string, ' ', ctrl->minimum);
+	}
+	if (handler_new_ref(hdl, ctrl)) {
+		kfree(ctrl);
+		return NULL;
+	}
+	mutex_lock(&hdl->lock);
+	list_add_tail(&ctrl->node, &hdl->ctrls);
+	mutex_unlock(&hdl->lock);
+	return ctrl;
+}
+
+struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_config *cfg, void *priv)
+{
+	bool is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU);
+
+	if (is_menu)
+		WARN_ON(cfg->step);
+	else
+		WARN_ON(cfg->menu_skip_mask);
+
+	return v4l2_ctrl_new(hdl, cfg->ops, cfg->id, cfg->name,
+			cfg->type, cfg->min, cfg->max,
+			is_menu ? cfg->menu_skip_mask : cfg->step,
+			cfg->def, cfg->flags, cfg->qmenu, priv);
+}
+EXPORT_SYMBOL(v4l2_ctrl_new_custom);
+
+/* Helper function for standard controls */
+struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_ops *ops,
+			u32 id, s32 min, s32 max, u32 step, s32 def)
+{
+	const char *name;
+	enum v4l2_ctrl_type type;
+	u32 flags;
+	const char **qmenu = v4l2_ctrl_get_menu(id);
+
+	v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
+	return v4l2_ctrl_new(hdl, ops, id, name, type,
+				    min, max, step, def, flags, qmenu, NULL);
+}
+EXPORT_SYMBOL(v4l2_ctrl_new_std);
+
+/* Helper function for standard menu controls */
+struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_ops *ops,
+			u32 id, s32 mask, s32 def)
+{
+	const char **menu = v4l2_ctrl_get_menu(id);
+	s32 items = -1;
+
+	if (menu)
+		while (*menu++)
+			items++;
+	return v4l2_ctrl_new_std(hdl, ops, id, 0, items, mask, def);
+}
+EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
+
+/* Add a control from another handler to this handler */
+struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
+					  struct v4l2_ctrl *ctrl)
+{
+	if (hdl == NULL || hdl->error)
+		return NULL;
+	if (ctrl == NULL) {
+		handler_set_err(hdl, -EINVAL);
+		return NULL;
+	}
+	if (ctrl->handler == hdl)
+		return ctrl;
+	return handler_new_ref(hdl, ctrl) ? NULL : ctrl;
+}
+EXPORT_SYMBOL(v4l2_ctrl_add_ctrl);
+
+/* Add the controls from another handler to our own. */
+int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
+			  struct v4l2_ctrl_handler *add)
+{
+	struct v4l2_ctrl *ctrl;
+	int ret = 0;
+
+	/* Do nothing if either handler is NULL or if they are the same */
+	if (!hdl || !add || hdl == add)
+		return 0;
+	if (hdl->error)
+		return hdl->error;
+	mutex_lock(&add->lock);
+	list_for_each_entry(ctrl, &add->ctrls, node) {
+		/* Skip handler-private controls. */
+		if (ctrl->is_private)
+			continue;
+		ret = handler_new_ref(hdl, ctrl);
+		if (ret)
+			break;
+	}
+	mutex_unlock(&add->lock);
+	return ret;
+}
+EXPORT_SYMBOL(v4l2_ctrl_add_handler);
+
+/* Cluster controls */
+void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls)
+{
+	int i;
+
+	/* The first control is the master control and it must not be NULL */
+	BUG_ON(controls[0] == NULL);
+
+	for (i = 0; i < ncontrols; i++) {
+		if (controls[i]) {
+			controls[i]->cluster = controls;
+			controls[i]->ncontrols = ncontrols;
+		}
+	}
+}
+EXPORT_SYMBOL(v4l2_ctrl_cluster);
+
+/* Activate/deactivate a control. */
+void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active)
+{
+	if (ctrl && ctrl->initialized) {
+		if (active)
+			ctrl->flags &= ~V4L2_CTRL_FLAG_INACTIVE;
+		else
+			ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
+	}
+}
+EXPORT_SYMBOL(v4l2_ctrl_activate);
+
+/* Grab/ungrab a control.
+   Typically used when streaming starts and you want to lock controls,
+   preventing the user from changing them.
+
+   Just call this and the framework will block any attempts to change
+   these controls. */
+void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed)
+{
+	if (ctrl && ctrl->initialized) {
+		if (grabbed)
+			ctrl->flags |= V4L2_CTRL_FLAG_GRABBED;
+		else
+			ctrl->flags &= ~V4L2_CTRL_FLAG_GRABBED;
+		v4l2_ctrl_unlock(ctrl);
+	}
+}
+EXPORT_SYMBOL(v4l2_ctrl_grab);
+
+/* Log the control name and value */
+static void log_ctrl(const struct v4l2_ctrl *ctrl,
+		     const char *prefix, const char *colon)
+{
+	int fl_inact = ctrl->flags & V4L2_CTRL_FLAG_INACTIVE;
+	int fl_grabbed = ctrl->flags & V4L2_CTRL_FLAG_GRABBED;
+
+	if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY))
+		return;
+	if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
+		return;
+
+	printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name);
+
+	switch (ctrl->type) {
+	case V4L2_CTRL_TYPE_INTEGER:
+		printk(KERN_CONT "%d", ctrl->cur.val);
+		break;
+	case V4L2_CTRL_TYPE_BOOLEAN:
+		printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false");
+		break;
+	case V4L2_CTRL_TYPE_MENU:
+		printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]);
+		break;
+	case V4L2_CTRL_TYPE_INTEGER64:
+		printk(KERN_CONT "%lld", ctrl->cur.val64);
+		break;
+	case V4L2_CTRL_TYPE_STRING:
+		printk(KERN_CONT "%s", ctrl->cur.string);
+		break;
+	default:
+		printk(KERN_CONT "unknown type %d", ctrl->type);
+		break;
+	}
+	if (fl_inact && fl_grabbed)
+		printk(KERN_CONT " (inactive, grabbed)\n");
+	else if (fl_inact)
+		printk(KERN_CONT " (inactive)\n");
+	else if (fl_grabbed)
+		printk(KERN_CONT " (grabbed)\n");
+	else
+		printk(KERN_CONT "\n");
+}
+
+/* Log all controls owned by the handler */
+void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
+				  const char *prefix)
+{
+	struct v4l2_ctrl *ctrl;
+	const char *colon = "";
+	int len;
+
+	if (hdl == NULL)
+		return;
+	if (prefix == NULL)
+		prefix = "";
+	len = strlen(prefix);
+	if (len && prefix[len - 1] != ' ')
+		colon = ": ";
+	mutex_lock(&hdl->lock);
+	list_for_each_entry(ctrl, &hdl->ctrls, node) {
+		if (!ctrl->initialized)
+			v4l2_ctrl_initialize(ctrl);
+		if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED))
+			log_ctrl(ctrl, prefix, colon);
+	}
+	mutex_unlock(&hdl->lock);
+}
+EXPORT_SYMBOL(v4l2_ctrl_handler_log_status);
+
+/* Call s_ctrl for all controls owned by the handler */
+int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl)
+{
+	struct v4l2_ctrl *ctrl;
+	int ret = 0;
+
+	if (hdl == NULL)
+		return 0;
+	mutex_lock(&hdl->lock);
+	list_for_each_entry(ctrl, &hdl->ctrls, node)
+		ctrl->done = false;
+
+	list_for_each_entry(ctrl, &hdl->ctrls, node) {
+		struct v4l2_ctrl *master = ctrl->cluster[0];
+		int i;
+
+		/* Skip if this control was already handled by a cluster. */
+		if (ctrl->done)
+			continue;
+
+		/* Skip if this control is not yet initialized. */
+		if (!ctrl->initialized)
+			continue;
+
+		for (i = 0; i < master->ncontrols; i++)
+			cur_to_new(master->cluster[i]);
+
+		/* Skip button controls and read-only controls. */
+		if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
+		    (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY))
+			continue;
+		ret = master->ops->s_ctrl(master);
+		if (ret)
+			break;
+		for (i = 0; i < master->ncontrols; i++)
+			if (master->cluster[i])
+				master->cluster[i]->done = true;
+	}
+	mutex_unlock(&hdl->lock);
+	return ret;
+}
+EXPORT_SYMBOL(v4l2_ctrl_handler_setup);
+
+/* Implement VIDIOC_QUERYCTRL */
+int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc)
+{
+	u32 id = qc->id & V4L2_CTRL_ID_MASK;
+	struct v4l2_ctrl_ref *ref;
+	struct v4l2_ctrl *ctrl;
+
+	if (hdl == NULL)
+		return -EINVAL;
+
+	mutex_lock(&hdl->lock);
+
+	/* Try to find it */
+	ref = find_ref(hdl, id);
+
+	if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) {
+		/* Find the next control with ID > qc->id */
+
+		/* Did we reach the end of the control list? */
+		if (id >= node2id(hdl->ctrl_refs.prev)) {
+			ref = NULL; /* Yes, so there is no next control */
+		} else if (ref) {
+			/* We found a control with the given ID, so just get
+			   the next one in the list. */
+			ref = list_entry(ref->node.next, typeof(*ref), node);
+		} else {
+			/* No control with the given ID exists, so start
+			   searching for the next largest ID. We know there
+			   is one, otherwise the first 'if' above would have
+			   been true. */
+			list_for_each_entry(ref, &hdl->ctrl_refs, node)
+				if (id < ref->ctrl->id)
+					break;
+		}
+	}
+	if (ref && !ref->ctrl->initialized)
+		v4l2_ctrl_initialize(ref->ctrl);
+	mutex_unlock(&hdl->lock);
+	if (!ref)
+		return -EINVAL;
+
+	ctrl = ref->ctrl;
+	memset(qc, 0, sizeof(*qc));
+	qc->id = ctrl->id;
+	strlcpy(qc->name, ctrl->name, sizeof(qc->name));
+	qc->minimum = ctrl->minimum;
+	qc->maximum = ctrl->maximum;
+	qc->default_value = ctrl->default_value;
+	if (qc->type == V4L2_CTRL_TYPE_MENU)
+		qc->step = 1;
+	else
+		qc->step = ctrl->step;
+	qc->flags = ctrl->flags;
+	qc->type = ctrl->type;
+	return 0;
+}
+EXPORT_SYMBOL(v4l2_queryctrl);
+
+int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
+{
+	return v4l2_queryctrl(sd->ctrl_handler, qc);
+}
+EXPORT_SYMBOL(v4l2_subdev_queryctrl);
+
+/* Implement VIDIOC_QUERYMENU */
+int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm)
+{
+	struct v4l2_ctrl *ctrl;
+	u32 i = qm->index;
+
+	ctrl = v4l2_ctrl_find(hdl, qm->id);
+	if (!ctrl)
+		return -EINVAL;
+
+	qm->reserved = 0;
+	/* Sanity checks */
+	if (ctrl->qmenu == NULL ||
+	    i < ctrl->minimum || i > ctrl->maximum)
+		return -EINVAL;
+	/* Use mask to see if this menu item should be skipped */
+	if (ctrl->menu_skip_mask & (1 << i))
+		return -EINVAL;
+	/* Empty menu items should also be skipped */
+	if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0')
+		return -EINVAL;
+	strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name));
+	return 0;
+}
+EXPORT_SYMBOL(v4l2_querymenu);
+
+int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm)
+{
+	return v4l2_querymenu(sd->ctrl_handler, qm);
+}
+EXPORT_SYMBOL(v4l2_subdev_querymenu);
+
+
+
+/* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS:
+
+   It is not a fully atomic operation, just best-effort only. After all, if
+   multiple controls have to be set through multiple i2c writes (for example)
+   then some initial writes may succeed while others fail. Thus leaving the
+   system in an inconsistent state. The question is how much effort you are
+   willing to spend on trying to make something atomic that really isn't.
+
+   From the point of view of an application the main requirement is that
+   when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an
+   error should be returned without actually affecting any controls.
+
+   If all the values are correct, then it is acceptable to just give up
+   in case of low-level errors.
+
+   It is important though that the application can tell when only a partial
+   configuration was done. The way we do that is through the error_idx field
+   of struct v4l2_ext_controls: if that is equal to the count field then no
+   controls were affected. Otherwise all controls before that index were
+   successful in performing their 'get' or 'set' operation, the control at
+   the given index failed, and you don't know what happened with the controls
+   after the failed one. Since if they were part of a control cluster they
+   could have been successfully processed (if a cluster member was encountered
+   at index < error_idx), they could have failed (if a cluster member was at
+   error_idx), or they may not have been processed yet (if the first cluster
+   member appeared after error_idx).
+
+   It is all fairly theoretical, though. In practice all you can do is to
+   bail out. If error_idx == count, then it is an application bug. If
+   error_idx < count then it is only an application bug if the error code was
+   EBUSY. That usually means that something started streaming just when you
+   tried to set the controls. In all other cases it is a driver/hardware
+   problem and all you can do is to retry or bail out.
+
+   Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that
+   never modifies controls the error_idx is just set to whatever control
+   has an invalid value.
+ */
+
+/* Prepare for the extended g/s/try functions.
+   Find the controls in the control array and do some basic checks. */
+static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl,
+			     struct v4l2_ext_controls *cs,
+			     struct ctrl_helper *helpers,
+			     bool try)
+{
+	u32 i;
+
+	for (i = 0; i < cs->count; i++) {
+		struct v4l2_ext_control *c = &cs->controls[i];
+		struct v4l2_ctrl *ctrl;
+		u32 id = c->id & V4L2_CTRL_ID_MASK;
+
+		if (try)
+			cs->error_idx = i;
+
+		if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class)
+			return -EINVAL;
+
+		/* Old-style private controls are not allowed for
+		   extended controls */
+		if (id >= V4L2_CID_PRIVATE_BASE)
+			return -EINVAL;
+		ctrl = v4l2_ctrl_find(hdl, id);
+		if (ctrl == NULL)
+			return -EINVAL;
+		if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED)
+			return -EINVAL;
+
+		helpers[i].ctrl = ctrl;
+		helpers[i].handled = false;
+	}
+	return 0;
+}
+
+typedef int (*cluster_func)(struct v4l2_ext_control *c,
+			    struct v4l2_ctrl *ctrl);
+
+/* Walk over all controls in v4l2_ext_controls belonging to the same cluster
+   and call the provided function. */
+static int cluster_walk(unsigned from,
+			struct v4l2_ext_controls *cs,
+			struct ctrl_helper *helpers,
+			cluster_func f)
+{
+	struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
+	int ret = 0;
+	int i;
+
+	/* Find any controls from the same cluster and call the function */
+	for (i = from; !ret && i < cs->count; i++) {
+		struct v4l2_ctrl *ctrl = helpers[i].ctrl;
+
+		if (!helpers[i].handled && ctrl->cluster == cluster)
+			ret = f(&cs->controls[i], ctrl);
+	}
+	return ret;
+}
+
+static void cluster_done(unsigned from,
+			 struct v4l2_ext_controls *cs,
+			 struct ctrl_helper *helpers)
+{
+	struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster;
+	int i;
+
+	/* Find any controls from the same cluster and mark them as handled */
+	for (i = from; i < cs->count; i++)
+		if (helpers[i].ctrl->cluster == cluster)
+			helpers[i].handled = true;
+}
+
+/* Handles the corner case where cs->count == 0. It checks whether the
+   specified control class exists. If that class ID is 0, then it checks
+   whether there are any controls at all. */
+static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class)
+{
+	if (ctrl_class == 0)
+		return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0;
+	return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL;
+}
+
+
+
+/* Get extended controls. Allocates the helpers array if needed. */
+int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
+{
+	struct ctrl_helper helper[4];
+	struct ctrl_helper *helpers = helper;
+	int ret;
+	int i;
+
+	cs->error_idx = cs->count;
+	cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
+
+	if (hdl == NULL)
+		return -EINVAL;
+
+	if (cs->count == 0)
+		return class_check(hdl, cs->ctrl_class);
+
+	if (cs->count > ARRAY_SIZE(helper)) {
+		helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
+		if (helpers == NULL)
+			return -ENOMEM;
+	}
+
+	ret = prepare_ext_ctrls(hdl, cs, helpers, false);
+
+	for (i = 0; !ret && i < cs->count; i++)
+		if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
+			ret = -EACCES;
+
+	for (i = 0; !ret && i < cs->count; i++) {
+		struct v4l2_ctrl *ctrl = helpers[i].ctrl;
+		struct v4l2_ctrl *master = ctrl->cluster[0];
+
+		if (helpers[i].handled)
+			continue;
+
+		cs->error_idx = i;
+
+		v4l2_ctrl_lock(master);
+		/* g_volatile_ctrl will update the current control values */
+		if (master->ops->g_volatile_ctrl)
+			ret = master->ops->g_volatile_ctrl(master);
+		/* If OK, then copy the current control values to the caller */
+		if (!ret)
+			ret = cluster_walk(i, cs, helpers, cur_to_user);
+		v4l2_ctrl_unlock(master);
+		cluster_done(i, cs, helpers);
+	}
+
+	if (cs->count > ARRAY_SIZE(helper))
+		kfree(helpers);
+	return ret;
+}
+EXPORT_SYMBOL(v4l2_g_ext_ctrls);
+
+int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
+{
+	return v4l2_g_ext_ctrls(sd->ctrl_handler, cs);
+}
+EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls);
+
+/* Helper function to get a single control */
+static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
+{
+	struct v4l2_ctrl *master = ctrl->cluster[0];
+	int ret = 0;
+
+	if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)
+		return -EACCES;
+
+	v4l2_ctrl_lock(master);
+	/* g_volatile_ctrl will update the current control values */
+	if (master->ops->g_volatile_ctrl)
+		ret = master->ops->g_volatile_ctrl(master);
+	*val = ctrl->cur.val;
+	v4l2_ctrl_unlock(master);
+	return ret;
+}
+
+int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
+{
+	struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
+
+	if (ctrl == NULL || !type_is_int(ctrl))
+		return -EINVAL;
+	return get_ctrl(ctrl, &control->value);
+}
+EXPORT_SYMBOL(v4l2_g_ctrl);
+
+int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
+{
+	return v4l2_g_ctrl(sd->ctrl_handler, control);
+}
+EXPORT_SYMBOL(v4l2_subdev_g_ctrl);
+
+s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl)
+{
+	s32 val = 0;
+
+	if (!ctrl->initialized)
+		v4l2_ctrl_initialize(ctrl);
+
+	/* It's a driver bug if this happens. */
+	WARN_ON(!type_is_int(ctrl));
+	get_ctrl(ctrl, &val);
+	return val;
+}
+EXPORT_SYMBOL(v4l2_ctrl_g_ctrl);
+
+
+/* Core function that calls try/s_ctrl and ensures that the new value is
+   copied to the current value on a set.
+   Must be called with ctrl->handler->lock held. */
+static int try_or_set_control_cluster(struct v4l2_ctrl *master, bool set)
+{
+	bool try = !set;
+	int ret = 0;
+	int i;
+
+	/* Go through the cluster and either validate the new value or
+	   (if no new value was set), copy the current value to the new
+	   value, ensuring a consistent view for the control ops when
+	   called. */
+	for (i = 0; !ret && i < master->ncontrols; i++) {
+		struct v4l2_ctrl *ctrl = master->cluster[i];
+
+		if (ctrl == NULL)
+			continue;
+
+		if (ctrl->has_new) {
+			/* Double check this: it may have changed since the
+			   last check in try_or_set_ext_ctrls(). */
+			if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
+				return -EBUSY;
+
+			/* Validate if required */
+			if (!set)
+				ret = validate_new(ctrl);
+			continue;
+		}
+		/* No new value was set, so copy the current and force
+		   a call to try_ctrl later, since the values for the cluster
+		   may now have changed and the end result might be invalid. */
+		try = true;
+		cur_to_new(ctrl);
+	}
+
+	/* For larger clusters you have to call try_ctrl again to
+	   verify that the controls are still valid after the
+	   'cur_to_new' above. */
+	if (!ret && master->ops->try_ctrl && try)
+		ret = master->ops->try_ctrl(master);
+
+	/* Don't set if there is no change */
+	if (!ret && set && cluster_changed(master)) {
+		ret = master->ops->s_ctrl(master);
+		/* If OK, then make the new values permanent. */
+		if (!ret)
+			for (i = 0; i < master->ncontrols; i++)
+				new_to_cur(master->cluster[i]);
+	}
+	return ret;
+}
+
+/* Try or set controls. */
+static int try_or_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
+				struct v4l2_ext_controls *cs,
+				struct ctrl_helper *helpers,
+				bool set)
+{
+	unsigned i, j;
+	int ret = 0;
+
+	cs->error_idx = cs->count;
+	for (i = 0; i < cs->count; i++) {
+		struct v4l2_ctrl *ctrl = helpers[i].ctrl;
+
+		if (!set)
+			cs->error_idx = i;
+
+		if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)
+			return -EACCES;
+		/* This test is also done in try_set_control_cluster() which
+		   is called in atomic context, so that has the final say,
+		   but it makes sense to do an up-front check as well. Once
+		   an error occurs in try_set_control_cluster() some other
+		   controls may have been set already and we want to do a
+		   best-effort to avoid that. */
+		if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
+			return -EBUSY;
+	}
+
+	for (i = 0; !ret && i < cs->count; i++) {
+		struct v4l2_ctrl *ctrl = helpers[i].ctrl;
+		struct v4l2_ctrl *master = ctrl->cluster[0];
+
+		cs->error_idx = i;
+
+		if (helpers[i].handled)
+			continue;
+
+		v4l2_ctrl_lock(ctrl);
+
+		/* Reset the 'has_new' flags of the cluster */
+		for (j = 0; j < master->ncontrols; j++)
+			if (master->cluster[j])
+				master->cluster[j]->has_new = 0;
+
+		/* Copy the new caller-supplied control values.
+		   user_to_new() sets 'has_new' to 1. */
+		ret = cluster_walk(i, cs, helpers, user_to_new);
+
+		if (!ret)
+			ret = try_or_set_control_cluster(master, set);
+
+		/* Copy the new values back to userspace. */
+		if (!ret)
+			ret = cluster_walk(i, cs, helpers, new_to_user);
+
+		v4l2_ctrl_unlock(ctrl);
+		cluster_done(i, cs, helpers);
+	}
+	return ret;
+}
+
+/* Try or try-and-set controls */
+static int try_set_ext_ctrls(struct v4l2_ctrl_handler *hdl,
+			     struct v4l2_ext_controls *cs,
+			     bool set)
+{
+	struct ctrl_helper helper[4];
+	struct ctrl_helper *helpers = helper;
+	int ret;
+	int i;
+
+	cs->error_idx = cs->count;
+	cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class);
+
+	if (hdl == NULL)
+		return -EINVAL;
+
+	if (cs->count == 0)
+		return class_check(hdl, cs->ctrl_class);
+
+	if (cs->count > ARRAY_SIZE(helper)) {
+		helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL);
+		if (!helpers)
+			return -ENOMEM;
+	}
+	ret = prepare_ext_ctrls(hdl, cs, helpers, !set);
+	if (ret)
+		goto free;
+
+	/* First 'try' all controls and abort on error */
+	ret = try_or_set_ext_ctrls(hdl, cs, helpers, false);
+	/* If this is a 'set' operation and the initial 'try' failed,
+	   then set error_idx to count to tell the application that no
+	   controls changed value yet. */
+	if (set)
+		cs->error_idx = cs->count;
+	if (!ret && set) {
+		/* Reset 'handled' state */
+		for (i = 0; i < cs->count; i++)
+			helpers[i].handled = false;
+		ret = try_or_set_ext_ctrls(hdl, cs, helpers, true);
+	}
+
+free:
+	if (cs->count > ARRAY_SIZE(helper))
+		kfree(helpers);
+	return ret;
+}
+
+int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
+{
+	return try_set_ext_ctrls(hdl, cs, false);
+}
+EXPORT_SYMBOL(v4l2_try_ext_ctrls);
+
+int v4l2_s_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs)
+{
+	return try_set_ext_ctrls(hdl, cs, true);
+}
+EXPORT_SYMBOL(v4l2_s_ext_ctrls);
+
+int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
+{
+	return try_set_ext_ctrls(sd->ctrl_handler, cs, false);
+}
+EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls);
+
+int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs)
+{
+	return try_set_ext_ctrls(sd->ctrl_handler, cs, true);
+}
+EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls);
+
+/* Helper function for VIDIOC_S_CTRL compatibility */
+static int set_ctrl(struct v4l2_ctrl *ctrl, s32 *val)
+{
+	struct v4l2_ctrl *master = ctrl->cluster[0];
+	int ret;
+	int i;
+
+	v4l2_ctrl_lock(ctrl);
+
+	/* Reset the 'has_new' flags of the cluster */
+	for (i = 0; i < master->ncontrols; i++)
+		if (master->cluster[i])
+			master->cluster[i]->has_new = 0;
+
+	ctrl->val = *val;
+	ctrl->has_new = 1;
+	ret = try_or_set_control_cluster(master, false);
+	if (!ret)
+		ret = try_or_set_control_cluster(master, true);
+	*val = ctrl->cur.val;
+	v4l2_ctrl_unlock(ctrl);
+	return ret;
+}
+
+int v4l2_s_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control)
+{
+	struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id);
+
+	if (ctrl == NULL || !type_is_int(ctrl))
+		return -EINVAL;
+
+	return set_ctrl(ctrl, &control->value);
+}
+EXPORT_SYMBOL(v4l2_s_ctrl);
+
+int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control)
+{
+	return v4l2_s_ctrl(sd->ctrl_handler, control);
+}
+EXPORT_SYMBOL(v4l2_subdev_s_ctrl);
+
+int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val)
+{
+	if (!ctrl->initialized)
+		v4l2_ctrl_initialize(ctrl);
+
+	/* It's a driver bug if this happens. */
+	WARN_ON(!type_is_int(ctrl));
+	return set_ctrl(ctrl, &val);
+}
+EXPORT_SYMBOL(v4l2_ctrl_s_ctrl);
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
new file mode 100644
index 0000000..1bb3a17
--- /dev/null
+++ b/include/media/v4l2-ctrls.h
@@ -0,0 +1,448 @@
+/*
+    V4L2 controls support header.
+
+    Copyright (C) 2010  Hans Verkuil <hverkuil@xs4all.nl>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _V4L2_CTRLS_H
+#define _V4L2_CTRLS_H
+
+#include <linux/list.h>
+#include <linux/device.h>
+
+/* forward references */
+struct v4l2_ctrl_handler;
+struct v4l2_ctrl;
+struct video_device;
+struct v4l2_subdev;
+
+/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
+  * @init:	Initialize struct v4l2_ctrl fields on first use. The following
+  *		fields may be initialized here:
+  *		type, minimum, maximum, default_value, step/menu_skip_mask,
+  *		qmenu, flags, cur and priv.
+  *		Typically only used if one or more of these values only become
+  *		known during runtime or if obtaining these values is an
+  *		expensive operation.
+  * @g_volatile_ctrl: Get a new value for this control. Generally only relevant
+  *		for volatile (and usually read-only) controls such as a control
+  *		that returns the current signal strength which changes
+  *		continuously.
+  *		If not set, then the currently cached value will be returned.
+  * @try_ctrl:	Test whether the control's value is valid. Only relevant when
+  *		the usual min/max/step checks are not sufficient.
+  * @s_ctrl:	Actually set the new control value. s_ctrl is compulsory. The
+  *		ctrl->handler->lock is held when these ops are called, so no
+  *		one else can access controls owned by that handler.
+  */
+struct v4l2_ctrl_ops {
+	void (*init)(struct v4l2_ctrl *ctrl);
+	int (*g_volatile_ctrl)(struct v4l2_ctrl *ctrl);
+	int (*try_ctrl)(struct v4l2_ctrl *ctrl);
+	int (*s_ctrl)(struct v4l2_ctrl *ctrl);
+};
+
+/** struct v4l2_ctrl - The control structure.
+  * @node:	The list node.
+  * @handler:	The handler that owns the control.
+  * @cluster:	Point to start of cluster array.
+  * @ncontrols:	Number of controls in cluster array.
+  * @has_new:	Internal flag: set when there is a valid new value.
+  * @done:	Internal flag: set for each processed control.
+  * @initialized: Internal flag: set if the control was initialized.
+  * @is_private: If set, then this control is private to its handler and it
+  *		will not be added to any other handlers. Drivers can set
+  *		this flag.
+  * @ops:	The control ops.
+  * @id:	The control ID.
+  * @name:	The control name.
+  * @type:	The control type.
+  * @minimum:	The control's minimum value.
+  * @maximum:	The control's maximum value.
+  * @default_value: The control's default value.
+  * @step:	The control's step value for non-menu controls.
+  * @menu_skip_mask: The control's skip mask for menu controls. This makes it
+  *		easy to skip menu items that are not valid. If bit X is set,
+  *		then menu item X is skipped. Of course, this only works for
+  *		menus with <= 32 menu items. There are no menus that come
+  *		close to that number, so this is OK. Should we ever need more,
+  *		then this will have to be extended to a u64 or a bit array.
+  * @qmenu:	A const char * array for all menu items. Array entries that are
+  *		empty strings ("") correspond to non-existing menu items (this
+  *		is in addition to the menu_skip_mask above). The last entry
+  *		must be NULL.
+  * @flags:	The control's flags.
+  * @cur:	The control's current value.
+  * @val:	The control's new s32 value.
+  * @val64:	The control's new s64 value.
+  * @string:	The control's new string value.
+  * @priv:	The control's private pointer. For use by the driver. It is
+  *		untouched by the control framework. Note that this pointer is
+  *		not freed when the control is deleted. Should this be needed
+  *		then a new internal bitfield can be added to tell the framework
+  *		to free this pointer.
+  */
+struct v4l2_ctrl {
+	/* Administrative fields */
+	struct list_head node;
+	struct v4l2_ctrl_handler *handler;
+	struct v4l2_ctrl **cluster;
+	unsigned ncontrols;
+	unsigned int has_new:1;
+	unsigned int done:1;
+	unsigned int initialized:1;
+
+	unsigned int is_private:1;
+
+	const struct v4l2_ctrl_ops *ops;
+	u32 id;
+	const char *name;
+	enum v4l2_ctrl_type type;
+	s32 minimum, maximum, default_value;
+	union {
+		u32 step;
+		u32 menu_skip_mask;
+	};
+	const char **qmenu;
+	u32 flags;
+	union {
+		s32 val;
+		s64 val64;
+		char *string;
+	} cur;
+	union {
+		s32 val;
+		s64 val64;
+		char *string;
+	};
+	void *priv;
+};
+
+/** struct v4l2_ctrl_ref - The control reference.
+  * @node:	List node for the sorted list.
+  * @next:	Single-link list node for the hash.
+  * @ctrl:	The actual control information.
+  *
+  * Each control handler has a list of these refs. The list_head is used to
+  * keep a sorted-by-control-ID list of all controls, while the next pointer
+  * is used to link the control in the hash's bucket.
+  */
+struct v4l2_ctrl_ref {
+	struct list_head node;
+	struct v4l2_ctrl_ref *next;
+	struct v4l2_ctrl *ctrl;
+};
+
+/** struct v4l2_ctrl_handler - The control handler keeps track of all the
+  * controls: both the controls owned by the handler and those inherited
+  * from other handlers.
+  * @lock:	Lock to control access to this handler and its controls.
+  * @ctrls:	The list of controls owned by this handler.
+  * @ctrl_refs:	The list of control references.
+  * @cached:	The last found control reference. It is common that the same
+  *		control is needed multiple times, so this is a simple
+  *		optimization.
+  * @buckets:	Buckets for the hashing. Allows for quick control lookup.
+  * @nr_of_buckets: Total number of buckets in the array.
+  * @error:	The error code of the first failed control addition.
+  */
+struct v4l2_ctrl_handler {
+	struct mutex lock;
+	struct list_head ctrls;
+	struct list_head ctrl_refs;
+	struct v4l2_ctrl_ref *cached;
+	struct v4l2_ctrl_ref **buckets;
+	u16 nr_of_buckets;
+	int error;
+};
+
+/** struct v4l2_ctrl_config - Control configuration structure.
+  * @ops:	The control ops.
+  * @id:	The control ID.
+  * @name:	The control name.
+  * @type:	The control type.
+  * @min:	The control's minimum value.
+  * @max:	The control's maximum value.
+  * @step:	The control's step value for non-menu controls.
+  * @def: 	The control's default value.
+  * @flags:	The control's flags.
+  * @menu_skip_mask: The control's skip mask for menu controls. This makes it
+  *		easy to skip menu items that are not valid. If bit X is set,
+  *		then menu item X is skipped. Of course, this only works for
+  *		menus with <= 32 menu items. There are no menus that come
+  *		close to that number, so this is OK. Should we ever need more,
+  *		then this will have to be extended to a u64 or a bit array.
+  * @qmenu:	A const char * array for all menu items. Array entries that are
+  *		empty strings ("") correspond to non-existing menu items (this
+  *		is in addition to the menu_skip_mask above). The last entry
+  *		must be NULL.
+  */
+struct v4l2_ctrl_config {
+	const struct v4l2_ctrl_ops *ops;
+	u32 id;
+	const char *name;
+	enum v4l2_ctrl_type type;
+	s32 min;
+	s32 max;
+	u32 step;
+	s32 def;
+	u32 flags;
+	u32 menu_skip_mask;
+	const char **qmenu;
+};
+
+/** v4l2_ctrl_fill() - Fill in the control fields based on the control ID.
+  *
+  * This works for all standard V4L2 controls.
+  * For non-standard controls it will only fill in the given arguments
+  * and @name will be NULL.
+  *
+  * This function will overwrite the contents of @name, @type and @flags.
+  * The contents of @min, @max, @step and @def may be modified depending on
+  * the type.
+  *
+  * Do not use in drivers! It is used internally for backwards compatibility
+  * control handling only. Once all drivers are converted to use the new
+  * control framework this function will no longer be exported.
+  */
+void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
+		    s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags);
+
+
+/** v4l2_ctrl_handler_init() - Initialize the control handler.
+  * @hdl:	The control handler.
+  * @nr_of_controls_hint: A hint of how many controls this handler is
+  *		expected to refer to. This is the total number, so including
+  *		any inherited controls. It doesn't have to be precise, but if
+  *		it is way off, then you either waste memory (too many buckets
+  *		are allocated) or the control lookup becomes slower (not enough
+  *		buckets are allocated, so there are more slow list lookups).
+  *		It will always work, though.
+  *
+  * Returns an error if the buckets could not be allocated. This error will
+  * also be stored in @hdl->error.
+  */
+int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl,
+			   unsigned nr_of_controls_hint);
+
+/** v4l2_ctrl_handler_free() - Free all controls owned by the handler and free
+  * the control list.
+  * @hdl:	The control handler.
+  *
+  * Does nothing if @hdl == NULL.
+  */
+void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl);
+
+/** v4l2_ctrl_handler_setup() - Call the s_ctrl op for all controls belonging
+  * to the handler to initialize the hardware to the current control values.
+  * @hdl:	The control handler.
+  *
+  * Button controls will be skipped, as are read-only controls. Controls that
+  * require initialization (@ops->init is set) are also skipped.
+  *
+  * If @hdl == NULL, then this just returns 0.
+  */
+int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl);
+
+/** v4l2_ctrl_handler_log_status() - Log all controls owned by the handler.
+  * @hdl:	The control handler.
+  * @prefix:	The prefix to use when logging the control values. If the
+  *		prefix does not end with a space, then ": " will be added
+  *		after the prefix. If @prefix == NULL, then no prefix will be
+  *		used.
+  *
+  * For use with VIDIOC_LOG_STATUS.
+  *
+  * Does nothing if @hdl == NULL.
+  */
+void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl,
+				  const char *prefix);
+
+/** v4l2_ctrl_new_custom() - Allocate and initialize a new custom V4L2
+  * control.
+  * @hdl:	The control handler.
+  * @cfg:	The control's configuration data.
+  * @priv:	The control's driver-specific private data.
+  *
+  * If the &v4l2_ctrl struct could not be allocated then NULL is returned
+  * and @hdl->error is set to the error code (if it wasn't set already).
+  */
+struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_config *cfg, void *priv);
+
+/** v4l2_ctrl_new_std() - Allocate and initialize a new standard V4L2 control.
+  * @hdl:	The control handler.
+  * @ops:	The control ops.
+  * @id:	The control ID.
+  * @min:	The control's minimum value.
+  * @max:	The control's maximum value.
+  * @step:	The control's step value for non-menu controls.
+  * @def: 	The control's default value.
+  *
+  * If the &v4l2_ctrl struct could not be allocated, or the control
+  * ID is not known, then NULL is returned and @hdl->error is set to the
+  * appropriate error code (if it wasn't set already).
+  */
+struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_ops *ops,
+			u32 id, s32 min, s32 max, u32 step, s32 def);
+
+/** v4l2_ctrl_new_std_menu() - Helper function for standard menu controls.
+  * @hdl:	The control handler.
+  * @ops:	The control ops.
+  * @id:	The control ID.
+  * @mask: 	The control's skip mask for menu controls. This makes it
+  *		easy to skip menu items that are not valid. If bit X is set,
+  *		then menu item X is skipped. Of course, this only works for
+  *		menus with <= 32 menu items. There are no menus that come
+  *		close to that number, so this is OK. Should we ever need more,
+  *		then this will have to be extended to a u64 or a bit array.
+  * @def: 	The control's default value.
+  *
+  * Same as v4l2_ctrl_new_std(), but @min is set to 0, @max is calculated based
+  * on the size of the menu and the @mask value determines which menu items
+  * are to be skipped.
+  */
+struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
+			const struct v4l2_ctrl_ops *ops,
+			u32 id, s32 mask, s32 def);
+
+/** v4l2_ctrl_add_ctrl() - Add a control from another handler to this handler.
+  * @hdl:	The control handler.
+  * @ctrl:	The control to add.
+  *
+  * It will return NULL if it was unable to add the control reference.
+  * If the control already belonged to the handler, then it will do
+  * nothing and just return @ctrl.
+  */
+struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl,
+					  struct v4l2_ctrl *ctrl);
+
+/** v4l2_ctrl_add_handler() - Add all controls from handler @add to
+  * handler @hdl.
+  * @hdl:	The control handler.
+  * @add:	The control handler whose controls you want to add to
+  *		the @hdl control handler.
+  *
+  * Does nothing if either of the two is a NULL pointer.
+  * In case of an error @hdl->error will be set to the error code (if it
+  * wasn't set already).
+  */
+int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl,
+			  struct v4l2_ctrl_handler *add);
+
+
+/** v4l2_ctrl_cluster() - Mark all controls in the cluster as belonging to that cluster.
+  * @ncontrols:	The number of controls in this cluster.
+  * @controls: 	The cluster control array of size @ncontrols.
+  */
+void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls);
+
+
+/** v4l2_ctrl_find() - Find a control with the given ID.
+  * @hdl:	The control handler.
+  * @id:	The control ID to find.
+  *
+  * If @hdl == NULL this will return NULL as well. Will lock the handler so
+  * do not use from inside &v4l2_ctrl_ops.
+  */
+struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
+
+/** v4l2_ctrl_activate() - Make the control active or inactive.
+  * @ctrl:	The control to (de)activate.
+  * @active:	True if the control should become active.
+  *
+  * This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag.
+  * Does nothing if @ctrl == NULL or if the control is uninitialized.
+  * Does not lock the @ctrl->handler. This will usually be called from
+  * within the s_ctrl op.
+  */
+void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
+
+/** v4l2_ctrl_grab() - Mark the control as grabbed or not grabbed.
+  * @ctrl:	The control to (de)activate.
+  * @grabbed:	True if the control should become grabbed.
+  *
+  * This sets or clears the V4L2_CTRL_FLAG_GRABBED flag. Does nothing
+  * if @ctrl == NULL or if the control is uninitialized.
+  * Will lock the @ctrl->handler. This will usually be called when starting
+  * or stopping streaming in the driver.
+  */
+void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
+
+/** v4l2_ctrl_lock() - Helper function to lock the handler
+  * associated with the control.
+  * @ctrl:	The control to lock.
+  */
+static inline void v4l2_ctrl_lock(struct v4l2_ctrl *ctrl)
+{
+	mutex_lock(&ctrl->handler->lock);
+}
+
+/** v4l2_ctrl_lock() - Helper function to unlock the handler
+  * associated with the control.
+  * @ctrl:	The control to unlock.
+  */
+static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
+{
+	mutex_unlock(&ctrl->handler->lock);
+}
+
+/** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver.
+  * @ctrl:	The control.
+  *
+  * This returns the control's value safely by going through the control
+  * framework. This function will lock the control's handler, so it cannot be
+  * used from within the &v4l2_ctrl_ops functions.
+  *
+  * This function is for integer type controls only.
+  */
+s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
+
+/** v4l2_ctrl_s_ctrl() - Helper function to set the control's value from within a driver.
+  * @ctrl:	The control.
+  * @val:	The new value.
+  *
+  * This set the control's new value safely by going through the control
+  * framework. This function will lock the control's handler, so it cannot be
+  * used from within the &v4l2_ctrl_ops functions.
+  *
+  * This function is for integer type controls only.
+  */
+int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
+
+
+/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
+int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
+int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
+int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl);
+int v4l2_s_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *ctrl);
+int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
+int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
+int v4l2_s_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *c);
+
+/* Helpers for subdevices. If the associated ctrl_handler == NULL then they
+   will all return -EINVAL. */
+int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
+int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
+int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
+int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
+int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs);
+int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
+int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
+
+#endif
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index bebe44b..1efcacb 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -27,6 +27,7 @@
 struct v4l2_ioctl_callbacks;
 struct video_device;
 struct v4l2_device;
+struct v4l2_ctrl_handler;
 
 /* Flag to mark the video_device struct as registered.
    Drivers can clear this flag if they want to block all future
@@ -67,6 +68,9 @@ struct video_device
 	struct device *parent;		/* device parent */
 	struct v4l2_device *v4l2_dev;	/* v4l2_device parent */
 
+	/* Control handler associated with this device node. May be NULL. */
+	struct v4l2_ctrl_handler *ctrl_handler;
+
 	/* device info */
 	char name[32];
 	int vfl_type;
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index 5d5d550..8bcbd7a 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -32,6 +32,8 @@
 
 #define V4L2_DEVICE_NAME_SIZE (20 + 16)
 
+struct v4l2_ctrl_handler;
+
 struct v4l2_device {
 	/* dev->driver_data points to this struct.
 	   Note: dev might be NULL if there is no parent device
@@ -47,6 +49,8 @@ struct v4l2_device {
 	/* notify callback called by some sub-devices. */
 	void (*notify)(struct v4l2_subdev *sd,
 			unsigned int notification, void *arg);
+	/* The control handler. May be NULL. */
+	struct v4l2_ctrl_handler *ctrl_handler;
 };
 
 /* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev.
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index a888893..927b4a6 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -35,6 +35,7 @@
 #define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ	0x00000001
 
 struct v4l2_device;
+struct v4l2_ctrl_handler;
 struct v4l2_subdev;
 struct tuner_setup;
 
@@ -415,6 +416,8 @@ struct v4l2_subdev {
 	u32 flags;
 	struct v4l2_device *v4l2_dev;
 	const struct v4l2_subdev_ops *ops;
+	/* The control handler of this subdev. May be NULL. */
+	struct v4l2_ctrl_handler *ctrl_handler;
 	/* name must be unique */
 	char name[V4L2_SUBDEV_NAME_SIZE];
 	/* can be used to group similar subdevs, value is driver-specific */
