drivers/media/video/cx18/cx18-controls.c - maze/linux - Git at Google

 /*
  *  cx18 ioctl control functions
  *
  *  Derived from ivtv-controls.c
  *
  *  Copyright (C) 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 "cx18-driver.h"
 #include "cx18-cards.h"
 #include "cx18-ioctl.h"
 #include "cx18-audio.h"
 #include "cx18-mailbox.h"
 #include "cx18-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 cx18_queryctrl(struct file *file, void *fh, struct v4l2_queryctrl *qctrl)
 {
 	struct cx18 *cx = ((struct cx18_open_id *)fh)->cx;
 	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_BRIGHTNESS:
 	case V4L2_CID_HUE:
 	case V4L2_CID_SATURATION:
 	case V4L2_CID_CONTRAST:
 		if (v4l2_subdev_call(cx->sd_av, 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(cx->sd_av, core, queryctrl, qctrl))
 			qctrl->flags |= V4L2_CTRL_FLAG_DISABLED;
 		return 0;

 	default:
 		if (cx2341x_ctrl_query(&cx->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 cx18_querymenu(struct file *file, void *fh, struct v4l2_querymenu *qmenu)
 {
 	struct cx18 *cx = ((struct cx18_open_id *)fh)->cx;
 	struct v4l2_queryctrl qctrl;

 	qctrl.id = qmenu->id;
 	cx18_queryctrl(file, fh, &qctrl);
 	return v4l2_ctrl_query_menu(qmenu, &qctrl,
 			cx2341x_ctrl_get_menu(&cx->params, qmenu->id));
 }

 static int cx18_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 = cx18_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 cx18_s_ctrl(struct cx18 *cx, 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(cx->sd_av, 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(cx->sd_av, core, s_ctrl, vctrl);

 	default:
 		CX18_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
 		return -EINVAL;
 	}
 	return 0;
 }

 static int cx18_g_ctrl(struct cx18 *cx, 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(cx->sd_av, 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(cx->sd_av, core, g_ctrl, vctrl);

 	default:
 		CX18_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
 		return -EINVAL;
 	}
 	return 0;
 }

 static int cx18_setup_vbi_fmt(struct cx18 *cx,
 			      enum v4l2_mpeg_stream_vbi_fmt fmt,
 			      enum v4l2_mpeg_stream_type type)
 {
 	if (!(cx->v4l2_cap & V4L2_CAP_SLICED_VBI_CAPTURE))
 		return -EINVAL;
 	if (atomic_read(&cx->ana_capturing) > 0)
 		return -EBUSY;

 	if (fmt != V4L2_MPEG_STREAM_VBI_FMT_IVTV ||
 	    type != V4L2_MPEG_STREAM_TYPE_MPEG2_PS) {
 		/* We don't do VBI insertion aside from IVTV format in a PS */
 		cx->vbi.insert_mpeg = V4L2_MPEG_STREAM_VBI_FMT_NONE;
 		CX18_DEBUG_INFO("disabled insertion of sliced VBI data into "
 				"the MPEG stream\n");
 		return 0;
 	}

 	/* Allocate sliced VBI buffers if needed. */
 	if (cx->vbi.sliced_mpeg_data[0] == NULL) {
 		int i;

 		for (i = 0; i < CX18_VBI_FRAMES; i++) {
 			cx->vbi.sliced_mpeg_data[i] =
 			       kmalloc(CX18_SLICED_MPEG_DATA_BUFSZ, GFP_KERNEL);
 			if (cx->vbi.sliced_mpeg_data[i] == NULL) {
 				while (--i >= 0) {
 					kfree(cx->vbi.sliced_mpeg_data[i]);
 					cx->vbi.sliced_mpeg_data[i] = NULL;
 				}
 				cx->vbi.insert_mpeg =
 						  V4L2_MPEG_STREAM_VBI_FMT_NONE;
 				CX18_WARN("Unable to allocate buffers for "
 					  "sliced VBI data insertion\n");
 				return -ENOMEM;
 			}
 		}
 	}

 	cx->vbi.insert_mpeg = fmt;
 	CX18_DEBUG_INFO("enabled insertion of sliced VBI data into the MPEG PS,"
 			"when sliced VBI is enabled\n");

 	/*
 	 * If our current settings have no lines set for capture, store a valid,
 	 * default set of service lines to capture, in our current settings.
 	 */
 	if (cx18_get_service_set(cx->vbi.sliced_in) == 0) {
 		if (cx->is_60hz)
 			cx->vbi.sliced_in->service_set =
 							V4L2_SLICED_CAPTION_525;
 		else
 			cx->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
 		cx18_expand_service_set(cx->vbi.sliced_in, cx->is_50hz);
 	}
 	return 0;
 }

 int cx18_g_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
 {
 	struct cx18 *cx = ((struct cx18_open_id *)fh)->cx;
 	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 = cx18_g_ctrl(cx, &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(&cx->params, 0, c, VIDIOC_G_EXT_CTRLS);
 	return -EINVAL;
 }

 int cx18_s_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
 {
 	struct cx18_open_id *id = fh;
 	struct cx18 *cx = id->cx;
 	int ret;
 	struct v4l2_control ctrl;

 	ret = v4l2_prio_check(&cx->prio, &id->prio);
 	if (ret)
 		return ret;

 	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 = cx18_s_ctrl(cx, &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 cx18_api_func_private priv;
 		struct cx2341x_mpeg_params p = cx->params;
 		int err = cx2341x_ext_ctrls(&p, atomic_read(&cx->ana_capturing),
 						c, VIDIOC_S_EXT_CTRLS);
 		unsigned int idx;

 		if (err)
 			return err;

 		if (p.video_encoding != cx->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 = cx->params.width
 						/ (is_mpeg1 ? 2 : 1);
 			fmt.fmt.pix.height = cx->params.height;
 			v4l2_subdev_call(cx->sd_av, video, s_fmt, &fmt);
 		}
 		priv.cx = cx;
 		priv.s = &cx->streams[id->type];
 		err = cx2341x_update(&priv, cx18_api_func, &cx->params, &p);
 		if (!err &&
 		    (cx->params.stream_vbi_fmt != p.stream_vbi_fmt ||
 		     cx->params.stream_type != p.stream_type))
 			err = cx18_setup_vbi_fmt(cx, p.stream_vbi_fmt,
 						 p.stream_type);
 		cx->params = p;
 		cx->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 < sizeof(freqs))
 			cx18_call_all(cx, audio, s_clock_freq, freqs[idx]);
 		return err;
 	}
 	return -EINVAL;
 }

 int cx18_try_ext_ctrls(struct file *file, void *fh, struct v4l2_ext_controls *c)
 {
 	struct cx18 *cx = ((struct cx18_open_id *)fh)->cx;

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

 		for (i = 0; i < c->count; i++) {
 			err = cx18_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(&cx->params,
 						atomic_read(&cx->ana_capturing),
 						c, VIDIOC_TRY_EXT_CTRLS);
 	return -EINVAL;
 }
	/*
	* cx18 ioctl control functions
	*
	* Derived from ivtv-controls.c
	*
	* Copyright (C) 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 "cx18-driver.h"
	#include "cx18-cards.h"
	#include "cx18-ioctl.h"
	#include "cx18-audio.h"
	#include "cx18-mailbox.h"
	#include "cx18-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 cx18_queryctrl(struct file file, void fh, struct v4l2_queryctrl *qctrl)
	{
	struct cx18 cx = ((struct cx18_open_id )fh)->cx;
	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_BRIGHTNESS:
	case V4L2_CID_HUE:
	case V4L2_CID_SATURATION:
	case V4L2_CID_CONTRAST:
	if (v4l2_subdev_call(cx->sd_av, 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(cx->sd_av, core, queryctrl, qctrl))
	qctrl->flags \|= V4L2_CTRL_FLAG_DISABLED;
	return 0;

	default:
	if (cx2341x_ctrl_query(&cx->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 cx18_querymenu(struct file file, void fh, struct v4l2_querymenu *qmenu)
	{
	struct cx18 cx = ((struct cx18_open_id )fh)->cx;
	struct v4l2_queryctrl qctrl;

	qctrl.id = qmenu->id;
	cx18_queryctrl(file, fh, &qctrl);
	return v4l2_ctrl_query_menu(qmenu, &qctrl,
	cx2341x_ctrl_get_menu(&cx->params, qmenu->id));
	}

	static int cx18_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 = cx18_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 cx18_s_ctrl(struct cx18 cx, 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(cx->sd_av, 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(cx->sd_av, core, s_ctrl, vctrl);

	default:
	CX18_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
	return -EINVAL;
	}
	return 0;
	}

	static int cx18_g_ctrl(struct cx18 cx, 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(cx->sd_av, 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(cx->sd_av, core, g_ctrl, vctrl);

	default:
	CX18_DEBUG_IOCTL("invalid control 0x%x\n", vctrl->id);
	return -EINVAL;
	}
	return 0;
	}

	static int cx18_setup_vbi_fmt(struct cx18 *cx,
	enum v4l2_mpeg_stream_vbi_fmt fmt,
	enum v4l2_mpeg_stream_type type)
	{
	if (!(cx->v4l2_cap & V4L2_CAP_SLICED_VBI_CAPTURE))
	return -EINVAL;
	if (atomic_read(&cx->ana_capturing) > 0)
	return -EBUSY;

	if (fmt != V4L2_MPEG_STREAM_VBI_FMT_IVTV \|\|
	type != V4L2_MPEG_STREAM_TYPE_MPEG2_PS) {
	/* We don't do VBI insertion aside from IVTV format in a PS */
	cx->vbi.insert_mpeg = V4L2_MPEG_STREAM_VBI_FMT_NONE;
	CX18_DEBUG_INFO("disabled insertion of sliced VBI data into "
	"the MPEG stream\n");
	return 0;
	}

	/* Allocate sliced VBI buffers if needed. */
	if (cx->vbi.sliced_mpeg_data[0] == NULL) {
	int i;

	for (i = 0; i < CX18_VBI_FRAMES; i++) {
	cx->vbi.sliced_mpeg_data[i] =
	kmalloc(CX18_SLICED_MPEG_DATA_BUFSZ, GFP_KERNEL);
	if (cx->vbi.sliced_mpeg_data[i] == NULL) {
	while (--i >= 0) {
	kfree(cx->vbi.sliced_mpeg_data[i]);
	cx->vbi.sliced_mpeg_data[i] = NULL;
	}
	cx->vbi.insert_mpeg =
	V4L2_MPEG_STREAM_VBI_FMT_NONE;
	CX18_WARN("Unable to allocate buffers for "
	"sliced VBI data insertion\n");
	return -ENOMEM;
	}
	}
	}

	cx->vbi.insert_mpeg = fmt;
	CX18_DEBUG_INFO("enabled insertion of sliced VBI data into the MPEG PS,"
	"when sliced VBI is enabled\n");

	/*
	* If our current settings have no lines set for capture, store a valid,
	* default set of service lines to capture, in our current settings.
	*/
	if (cx18_get_service_set(cx->vbi.sliced_in) == 0) {
	if (cx->is_60hz)
	cx->vbi.sliced_in->service_set =
	V4L2_SLICED_CAPTION_525;
	else
	cx->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
	cx18_expand_service_set(cx->vbi.sliced_in, cx->is_50hz);
	}
	return 0;
	}

	int cx18_g_ext_ctrls(struct file file, void fh, struct v4l2_ext_controls *c)
	{
	struct cx18 cx = ((struct cx18_open_id )fh)->cx;
	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 = cx18_g_ctrl(cx, &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(&cx->params, 0, c, VIDIOC_G_EXT_CTRLS);
	return -EINVAL;
	}

	int cx18_s_ext_ctrls(struct file file, void fh, struct v4l2_ext_controls *c)
	{
	struct cx18_open_id *id = fh;
	struct cx18 *cx = id->cx;
	int ret;
	struct v4l2_control ctrl;

	ret = v4l2_prio_check(&cx->prio, &id->prio);
	if (ret)
	return ret;

	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 = cx18_s_ctrl(cx, &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 cx18_api_func_private priv;
	struct cx2341x_mpeg_params p = cx->params;
	int err = cx2341x_ext_ctrls(&p, atomic_read(&cx->ana_capturing),
	c, VIDIOC_S_EXT_CTRLS);
	unsigned int idx;

	if (err)
	return err;

	if (p.video_encoding != cx->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 = cx->params.width
	/ (is_mpeg1 ? 2 : 1);
	fmt.fmt.pix.height = cx->params.height;
	v4l2_subdev_call(cx->sd_av, video, s_fmt, &fmt);
	}
	priv.cx = cx;
	priv.s = &cx->streams[id->type];
	err = cx2341x_update(&priv, cx18_api_func, &cx->params, &p);
	if (!err &&
	(cx->params.stream_vbi_fmt != p.stream_vbi_fmt \|\|
	cx->params.stream_type != p.stream_type))
	err = cx18_setup_vbi_fmt(cx, p.stream_vbi_fmt,
	p.stream_type);
	cx->params = p;
	cx->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 < sizeof(freqs))
	cx18_call_all(cx, audio, s_clock_freq, freqs[idx]);
	return err;
	}
	return -EINVAL;
	}

	int cx18_try_ext_ctrls(struct file file, void fh, struct v4l2_ext_controls *c)
	{
	struct cx18 cx = ((struct cx18_open_id )fh)->cx;

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

	for (i = 0; i < c->count; i++) {
	err = cx18_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(&cx->params,
	atomic_read(&cx->ana_capturing),
	c, VIDIOC_TRY_EXT_CTRLS);
	return -EINVAL;
	}