drivers/media/video/ivtv/ivtv-controls.c - kernel/windcharger - Git at Google

 /*
     ioctl control functions
     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
     Copyright (C) 2005-2007  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/kernel.h>

 #include "ivtv-driver.h"
 #include "ivtv-cards.h"
 #include "ivtv-ioctl.h"
 #include "ivtv-routing.h"
 #include "ivtv-i2c.h"
 #include "ivtv-mailbox.h"
 #include "ivtv-controls.h"

 /* Must be sorted from low to high control ID! */
 static const u32 user_ctrls[] = {
 	V4L2_CID_USER_CLASS,
 	V4L2_CID_BRIGHTNESS,
 	V4L2_CID_CONTRAST,
 	V4L2_CID_SATURATION,
 	V4L2_CID_HUE,
 	V4L2_CID_AUDIO_VOLUME,
 	V4L2_CID_AUDIO_BALANCE,
 	V4L2_CID_AUDIO_BASS,
 	V4L2_CID_AUDIO_TREBLE,
 	V4L2_CID_AUDIO_MUTE,
 	V4L2_CID_AUDIO_LOUDNESS,
 	0
 };

 static const u32 *ctrl_classes[] = {
 	user_ctrls,
 	cx2341x_mpeg_ctrls,
 	NULL
 };


 int ivtv_queryctrl(struct file *file, void *fh, struct v4l2_queryctrl *qctrl)
 {
 	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
 	const char *name;

 	qctrl->id = v4l2_ctrl_next(ctrl_classes, qctrl->id);
 	if (qctrl->id == 0)
 		return -EINVAL;

 	switch (qctrl->id) {
 	/* Standard V4L2 controls */
 	case V4L2_CID_USER_CLASS:
 		return v4l2_ctrl_query_fill(qctrl, 0, 0, 0, 0);
 	case V4L2_CID_BRIGHTNESS:
 	case V4L2_CID_HUE:
 	case V4L2_CID_SATURATION:
 	case V4L2_CID_CONTRAST:
 		if (v4l2_subdev_call(itv->sd_video, core, queryctrl, qctrl))
 			qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 		return 0;

 	case V4L2_CID_AUDIO_VOLUME:
 	case V4L2_CID_AUDIO_MUTE:
 	case V4L2_CID_AUDIO_BALANCE:
 	case V4L2_CID_AUDIO_BASS:
 	case V4L2_CID_AUDIO_TREBLE:
 	case V4L2_CID_AUDIO_LOUDNESS:
 		if (v4l2_subdev_call(itv->sd_audio, core, queryctrl, qctrl))
 			qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 		return 0;

 	default:
 		if (cx2341x_ctrl_query(&itv->params, qctrl))
 			qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 		return 0;
 	}
 	strncpy(qctrl->name, name, sizeof(qctrl->name) - 1);
 	qctrl->name[sizeof(qctrl->name) - 1] = 0;
 	return 0;
 }

 int ivtv_querymenu(struct file *file, void *fh, struct v4l2_querymenu *qmenu)
 {
 	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
 	struct v4l2_queryctrl qctrl;

 	qctrl.id = qmenu->id;
 	ivtv_queryctrl(file, fh, &qctrl);
 	return v4l2_ctrl_query_menu(qmenu, &qctrl,
 			cx2341x_ctrl_get_menu(&itv->params, qmenu->id));
 }

 static int ivtv_try_ctrl(struct file *file, void *fh,
 					struct v4l2_ext_control *vctrl)
 {
 	struct v4l2_queryctrl qctrl;
 	const char **menu_items = NULL;
 	int err;

 	qctrl.id = vctrl->id;
 	err = ivtv_queryctrl(file, fh, &qctrl);
 	if (err)
 		return err;
 	if (qctrl.type == V4L2_CTRL_TYPE_MENU)
 		menu_items = v4l2_ctrl_get_menu(qctrl.id);
 	return v4l2_ctrl_check(vctrl, &qctrl, menu_items);
 }

 static int ivtv_s_ctrl(struct ivtv *itv, struct v4l2_control *vctrl)
 {
 	switch (vctrl->id) {
 		/* Standard V4L2 controls */
 	case V4L2_CID_BRIGHTNESS:
 	case V4L2_CID_HUE:
 	case V4L2_CID_SATURATION:
 	case V4L2_CID_CONTRAST:
 		return v4l2_subdev_call(itv->sd_video, core, s_ctrl, vctrl);

 	case V4L2_CID_AUDIO_VOLUME:
 	case V4L2_CID_AUDIO_MUTE:
 	case V4L2_CID_AUDIO_BALANCE:
 	case V4L2_CID_AUDIO_BASS:
 	case V4L2_CID_AUDIO_TREBLE:
 	case V4L2_CID_AUDIO_LOUDNESS:
 		return v4l2_subdev_call(itv->sd_audio, core, s_ctrl, vctrl);

 	default:
 		IVTV_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
 		return -EINVAL;
 	}
 	return 0;
 }

 static int ivtv_g_ctrl(struct ivtv *itv, struct v4l2_control *vctrl)
 {
 	switch (vctrl->id) {
 		/* Standard V4L2 controls */
 	case V4L2_CID_BRIGHTNESS:
 	case V4L2_CID_HUE:
 	case V4L2_CID_SATURATION:
 	case V4L2_CID_CONTRAST:
 		return v4l2_subdev_call(itv->sd_video, core, g_ctrl, vctrl);

 	case V4L2_CID_AUDIO_VOLUME:
 	case V4L2_CID_AUDIO_MUTE:
 	case V4L2_CID_AUDIO_BALANCE:
 	case V4L2_CID_AUDIO_BASS:
 	case V4L2_CID_AUDIO_TREBLE:
 	case V4L2_CID_AUDIO_LOUDNESS:
 		return v4l2_subdev_call(itv->sd_audio, core, g_ctrl, vctrl);
 	default:
 		IVTV_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
 		return -EINVAL;
 	}
 	return 0;
 }

 static int ivtv_setup_vbi_fmt(struct ivtv *itv, enum v4l2_mpeg_stream_vbi_fmt fmt)
 {
 	if (!(itv->v4l2_cap & V4L2_CAP_SLICED_VBI_CAPTURE))
 		return -EINVAL;
 	if (atomic_read(&itv->capturing) > 0)
 		return -EBUSY;

 	/* First try to allocate sliced VBI buffers if needed. */
 	if (fmt && itv->vbi.sliced_mpeg_data[0] == NULL) {
 		int i;

 		for (i = 0; i < IVTV_VBI_FRAMES; i++) {
 			/* Yuck, hardcoded. Needs to be a define */
 			itv->vbi.sliced_mpeg_data[i] = kmalloc(2049, GFP_KERNEL);
 			if (itv->vbi.sliced_mpeg_data[i] == NULL) {
 				while (--i >= 0) {
 					kfree(itv->vbi.sliced_mpeg_data[i]);
 					itv->vbi.sliced_mpeg_data[i] = NULL;
 				}
 				return -ENOMEM;
 			}
 		}
 	}

 	itv->vbi.insert_mpeg = fmt;

 	if (itv->vbi.insert_mpeg == 0) {
 		return 0;
 	}
 	/* Need sliced data for mpeg insertion */
 	if (ivtv_get_service_set(itv->vbi.sliced_in) == 0) {
 		if (itv->is_60hz)
 			itv->vbi.sliced_in->service_set = V4L2_SLICED_CAPTION_525;
 		else
 			itv->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
 		ivtv_expand_service_set(itv->vbi.sliced_in, itv->is_50hz);
 	}
 	return 0;
 }

 int ivtv_g_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
 {
 	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
 	struct v4l2_control ctrl;

 	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
 		int i;
 		int err = 0;

 		for (i = 0; i < c->count; i++) {
 			ctrl.id = c->controls[i].id;
 			ctrl.value = c->controls[i].value;
 			err = ivtv_g_ctrl(itv, &ctrl);
 			c->controls[i].value = ctrl.value;
 			if (err) {
 				c->error_idx = i;
 				break;
 			}
 		}
 		return err;
 	}
 	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG)
 		return cx2341x_ext_ctrls(&itv->params, 0, c, VIDIOC_G_EXT_CTRLS);
 	return -EINVAL;
 }

 int ivtv_s_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
 {
 	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;
 	struct v4l2_control ctrl;

 	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
 		int i;
 		int err = 0;

 		for (i = 0; i < c->count; i++) {
 			ctrl.id = c->controls[i].id;
 			ctrl.value = c->controls[i].value;
 			err = ivtv_s_ctrl(itv, &ctrl);
 			c->controls[i].value = ctrl.value;
 			if (err) {
 				c->error_idx = i;
 				break;
 			}
 		}
 		return err;
 	}
 	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
 		static u32 freqs[3] = { 44100, 48000, 32000 };
 		struct cx2341x_mpeg_params p = itv->params;
 		int err = cx2341x_ext_ctrls(&p, atomic_read(&itv->capturing), c, VIDIOC_S_EXT_CTRLS);
 		unsigned idx;

 		if (err)
 			return err;

 		if (p.video_encoding != itv->params.video_encoding) {
 			int is_mpeg1 = p.video_encoding ==
 				V4L2_MPEG_VIDEO_ENCODING_MPEG_1;
 			struct v4l2_format fmt;

 			/* fix videodecoder resolution */
 			fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 			fmt.fmt.pix.width = itv->params.width / (is_mpeg1 ? 2 : 1);
 			fmt.fmt.pix.height = itv->params.height;
 			v4l2_subdev_call(itv->sd_video, video, s_fmt, &fmt);
 		}
 		err = cx2341x_update(itv, ivtv_api_func, &itv->params, &p);
 		if (!err && itv->params.stream_vbi_fmt != p.stream_vbi_fmt)
 			err = ivtv_setup_vbi_fmt(itv, p.stream_vbi_fmt);
 		itv->params = p;
 		itv->dualwatch_stereo_mode = p.audio_properties & 0x0300;
 		idx = p.audio_properties & 0x03;
 		/* The audio clock of the digitizer must match the codec sample
 		   rate otherwise you get some very strange effects. */
 		if (idx < ARRAY_SIZE(freqs))
 			ivtv_call_all(itv, audio, s_clock_freq, freqs[idx]);
 		return err;
 	}
 	return -EINVAL;
 }

 int ivtv_try_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
 {
 	struct ivtv *itv = ((struct ivtv_open_id *)fh)->itv;

 	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
 		int i;
 		int err = 0;

 		for (i = 0; i < c->count; i++) {
 			err = ivtv_try_ctrl(file, fh, &c->controls[i]);
 			if (err) {
 				c->error_idx = i;
 				break;
 			}
 		}
 		return err;
 	}
 	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG)
 		return cx2341x_ext_ctrls(&itv->params, atomic_read(&itv->capturing), c, VIDIOC_TRY_EXT_CTRLS);
 	return -EINVAL;
 }
	/*
	ioctl control functions
	Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
	Copyright (C) 2005-2007 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/kernel.h>

	#include "ivtv-driver.h"
	#include "ivtv-cards.h"
	#include "ivtv-ioctl.h"
	#include "ivtv-routing.h"
	#include "ivtv-i2c.h"
	#include "ivtv-mailbox.h"
	#include "ivtv-controls.h"

	/* Must be sorted from low to high control ID! */
	static const u32 user_ctrls[] = {
	V4L2_CID_USER_CLASS,
	V4L2_CID_BRIGHTNESS,
	V4L2_CID_CONTRAST,
	V4L2_CID_SATURATION,
	V4L2_CID_HUE,
	V4L2_CID_AUDIO_VOLUME,
	V4L2_CID_AUDIO_BALANCE,
	V4L2_CID_AUDIO_BASS,
	V4L2_CID_AUDIO_TREBLE,
	V4L2_CID_AUDIO_MUTE,
	V4L2_CID_AUDIO_LOUDNESS,
	0
	};

	static const u32 *ctrl_classes[] = {
	user_ctrls,
	cx2341x_mpeg_ctrls,
	NULL
	};


	int ivtv_queryctrl(struct file file, void fh, struct v4l2_queryctrl *qctrl)
	{
	struct ivtv itv = ((struct ivtv_open_id )fh)->itv;
	const char *name;

	qctrl->id = v4l2_ctrl_next(ctrl_classes, qctrl->id);
	if (qctrl->id == 0)
	return -EINVAL;

	switch (qctrl->id) {
	/* Standard V4L2 controls */
	case V4L2_CID_USER_CLASS:
	return v4l2_ctrl_query_fill(qctrl, 0, 0, 0, 0);
	case V4L2_CID_BRIGHTNESS:
	case V4L2_CID_HUE:
	case V4L2_CID_SATURATION:
	case V4L2_CID_CONTRAST:
	if (v4l2_subdev_call(itv->sd_video, core, queryctrl, qctrl))
	qctrl->flags \|= V4L2_CTRL_FLAG_DISABLED;
	return 0;

	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_MUTE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_LOUDNESS:
	if (v4l2_subdev_call(itv->sd_audio, core, queryctrl, qctrl))
	qctrl->flags \|= V4L2_CTRL_FLAG_DISABLED;
	return 0;

	default:
	if (cx2341x_ctrl_query(&itv->params, qctrl))
	qctrl->flags \|= V4L2_CTRL_FLAG_DISABLED;
	return 0;
	}
	strncpy(qctrl->name, name, sizeof(qctrl->name) - 1);
	qctrl->name[sizeof(qctrl->name) - 1] = 0;
	return 0;
	}

	int ivtv_querymenu(struct file file, void fh, struct v4l2_querymenu *qmenu)
	{
	struct ivtv itv = ((struct ivtv_open_id )fh)->itv;
	struct v4l2_queryctrl qctrl;

	qctrl.id = qmenu->id;
	ivtv_queryctrl(file, fh, &qctrl);
	return v4l2_ctrl_query_menu(qmenu, &qctrl,
	cx2341x_ctrl_get_menu(&itv->params, qmenu->id));
	}

	static int ivtv_try_ctrl(struct file file, void fh,
	struct v4l2_ext_control *vctrl)
	{
	struct v4l2_queryctrl qctrl;
	const char **menu_items = NULL;
	int err;

	qctrl.id = vctrl->id;
	err = ivtv_queryctrl(file, fh, &qctrl);
	if (err)
	return err;
	if (qctrl.type == V4L2_CTRL_TYPE_MENU)
	menu_items = v4l2_ctrl_get_menu(qctrl.id);
	return v4l2_ctrl_check(vctrl, &qctrl, menu_items);
	}

	static int ivtv_s_ctrl(struct ivtv itv, struct v4l2_control vctrl)
	{
	switch (vctrl->id) {
	/* Standard V4L2 controls */
	case V4L2_CID_BRIGHTNESS:
	case V4L2_CID_HUE:
	case V4L2_CID_SATURATION:
	case V4L2_CID_CONTRAST:
	return v4l2_subdev_call(itv->sd_video, core, s_ctrl, vctrl);

	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_MUTE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_LOUDNESS:
	return v4l2_subdev_call(itv->sd_audio, core, s_ctrl, vctrl);

	default:
	IVTV_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
	return -EINVAL;
	}
	return 0;
	}

	static int ivtv_g_ctrl(struct ivtv itv, struct v4l2_control vctrl)
	{
	switch (vctrl->id) {
	/* Standard V4L2 controls */
	case V4L2_CID_BRIGHTNESS:
	case V4L2_CID_HUE:
	case V4L2_CID_SATURATION:
	case V4L2_CID_CONTRAST:
	return v4l2_subdev_call(itv->sd_video, core, g_ctrl, vctrl);

	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_MUTE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_LOUDNESS:
	return v4l2_subdev_call(itv->sd_audio, core, g_ctrl, vctrl);
	default:
	IVTV_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
	return -EINVAL;
	}
	return 0;
	}

	static int ivtv_setup_vbi_fmt(struct ivtv *itv, enum v4l2_mpeg_stream_vbi_fmt fmt)
	{
	if (!(itv->v4l2_cap & V4L2_CAP_SLICED_VBI_CAPTURE))
	return -EINVAL;
	if (atomic_read(&itv->capturing) > 0)
	return -EBUSY;

	/* First try to allocate sliced VBI buffers if needed. */
	if (fmt && itv->vbi.sliced_mpeg_data[0] == NULL) {
	int i;

	for (i = 0; i < IVTV_VBI_FRAMES; i++) {
	/* Yuck, hardcoded. Needs to be a define */
	itv->vbi.sliced_mpeg_data[i] = kmalloc(2049, GFP_KERNEL);
	if (itv->vbi.sliced_mpeg_data[i] == NULL) {
	while (--i >= 0) {
	kfree(itv->vbi.sliced_mpeg_data[i]);
	itv->vbi.sliced_mpeg_data[i] = NULL;
	}
	return -ENOMEM;
	}
	}
	}

	itv->vbi.insert_mpeg = fmt;

	if (itv->vbi.insert_mpeg == 0) {
	return 0;
	}
	/* Need sliced data for mpeg insertion */
	if (ivtv_get_service_set(itv->vbi.sliced_in) == 0) {
	if (itv->is_60hz)
	itv->vbi.sliced_in->service_set = V4L2_SLICED_CAPTION_525;
	else
	itv->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
	ivtv_expand_service_set(itv->vbi.sliced_in, itv->is_50hz);
	}
	return 0;
	}

	int ivtv_g_ext_ctrls(struct file file, void fh, struct v4l2_ext_controls *c)
	{
	struct ivtv itv = ((struct ivtv_open_id )fh)->itv;
	struct v4l2_control ctrl;

	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
	int i;
	int err = 0;

	for (i = 0; i < c->count; i++) {
	ctrl.id = c->controls[i].id;
	ctrl.value = c->controls[i].value;
	err = ivtv_g_ctrl(itv, &ctrl);
	c->controls[i].value = ctrl.value;
	if (err) {
	c->error_idx = i;
	break;
	}
	}
	return err;
	}
	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG)
	return cx2341x_ext_ctrls(&itv->params, 0, c, VIDIOC_G_EXT_CTRLS);
	return -EINVAL;
	}

	int ivtv_s_ext_ctrls(struct file file, void fh, struct v4l2_ext_controls *c)
	{
	struct ivtv itv = ((struct ivtv_open_id )fh)->itv;
	struct v4l2_control ctrl;

	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
	int i;
	int err = 0;

	for (i = 0; i < c->count; i++) {
	ctrl.id = c->controls[i].id;
	ctrl.value = c->controls[i].value;
	err = ivtv_s_ctrl(itv, &ctrl);
	c->controls[i].value = ctrl.value;
	if (err) {
	c->error_idx = i;
	break;
	}
	}
	return err;
	}
	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG) {
	static u32 freqs[3] = { 44100, 48000, 32000 };
	struct cx2341x_mpeg_params p = itv->params;
	int err = cx2341x_ext_ctrls(&p, atomic_read(&itv->capturing), c, VIDIOC_S_EXT_CTRLS);
	unsigned idx;

	if (err)
	return err;

	if (p.video_encoding != itv->params.video_encoding) {
	int is_mpeg1 = p.video_encoding ==
	V4L2_MPEG_VIDEO_ENCODING_MPEG_1;
	struct v4l2_format fmt;

	/* fix videodecoder resolution */
	fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	fmt.fmt.pix.width = itv->params.width / (is_mpeg1 ? 2 : 1);
	fmt.fmt.pix.height = itv->params.height;
	v4l2_subdev_call(itv->sd_video, video, s_fmt, &fmt);
	}
	err = cx2341x_update(itv, ivtv_api_func, &itv->params, &p);
	if (!err && itv->params.stream_vbi_fmt != p.stream_vbi_fmt)
	err = ivtv_setup_vbi_fmt(itv, p.stream_vbi_fmt);
	itv->params = p;
	itv->dualwatch_stereo_mode = p.audio_properties & 0x0300;
	idx = p.audio_properties & 0x03;
	/* The audio clock of the digitizer must match the codec sample
	rate otherwise you get some very strange effects. */
	if (idx < ARRAY_SIZE(freqs))
	ivtv_call_all(itv, audio, s_clock_freq, freqs[idx]);
	return err;
	}
	return -EINVAL;
	}

	int ivtv_try_ext_ctrls(struct file file, void fh, struct v4l2_ext_controls *c)
	{
	struct ivtv itv = ((struct ivtv_open_id )fh)->itv;

	if (c->ctrl_class == V4L2_CTRL_CLASS_USER) {
	int i;
	int err = 0;

	for (i = 0; i < c->count; i++) {
	err = ivtv_try_ctrl(file, fh, &c->controls[i]);
	if (err) {
	c->error_idx = i;
	break;
	}
	}
	return err;
	}
	if (c->ctrl_class == V4L2_CTRL_CLASS_MPEG)
	return cx2341x_ext_ctrls(&itv->params, atomic_read(&itv->capturing), c, VIDIOC_TRY_EXT_CTRLS);
	return -EINVAL;
	}