drivers/media/video/cx18/cx18-av-audio.c - linux - Git at Google

 /*
  *  cx18 ADEC audio functions
  *
  *  Derived from cx25840-audio.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., 51 Franklin Street, Fifth Floor, Boston, MA
  *  02110-1301, USA.
  */

 #include "cx18-driver.h"

 static int set_audclk_freq(struct cx18 *cx, u32 freq)
 {
 	struct cx18_av_state *state = &cx->av_state;

 	if (freq != 32000 && freq != 44100 && freq != 48000)
 		return -EINVAL;

 	/* common for all inputs and rates */
 	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
 	cx18_av_write(cx, 0x127, 0x50);

 	if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
 		switch (freq) {
 		case 32000:
 			/* VID_PLL and AUX_PLL */
 			cx18_av_write4(cx, 0x108, 0x1006040f);

 			/* AUX_PLL_FRAC */
 			cx18_av_write4(cx, 0x110, 0x01bb39ee);

 			/* src3/4/6_ctl = 0x0801f77f */
 			cx18_av_write4(cx, 0x900, 0x0801f77f);
 			cx18_av_write4(cx, 0x904, 0x0801f77f);
 			cx18_av_write4(cx, 0x90c, 0x0801f77f);
 			break;

 		case 44100:
 			/* VID_PLL and AUX_PLL */
 			cx18_av_write4(cx, 0x108, 0x1009040f);

 			/* AUX_PLL_FRAC */
 			cx18_av_write4(cx, 0x110, 0x00ec6bd6);

 			/* src3/4/6_ctl = 0x08016d59 */
 			cx18_av_write4(cx, 0x900, 0x08016d59);
 			cx18_av_write4(cx, 0x904, 0x08016d59);
 			cx18_av_write4(cx, 0x90c, 0x08016d59);
 			break;

 		case 48000:
 			/* VID_PLL and AUX_PLL */
 			cx18_av_write4(cx, 0x108, 0x100a040f);

 			/* AUX_PLL_FRAC */
 			cx18_av_write4(cx, 0x110, 0x0098d6e5);

 			/* src3/4/6_ctl = 0x08014faa */
 			cx18_av_write4(cx, 0x900, 0x08014faa);
 			cx18_av_write4(cx, 0x904, 0x08014faa);
 			cx18_av_write4(cx, 0x90c, 0x08014faa);
 			break;
 		}
 	} else {
 		switch (freq) {
 		case 32000:
 			/* VID_PLL and AUX_PLL */
 			cx18_av_write4(cx, 0x108, 0x1e08040f);

 			/* AUX_PLL_FRAC */
 			cx18_av_write4(cx, 0x110, 0x012a0869);

 			/* src1_ctl = 0x08010000 */
 			cx18_av_write4(cx, 0x8f8, 0x08010000);

 			/* src3/4/6_ctl = 0x08020000 */
 			cx18_av_write4(cx, 0x900, 0x08020000);
 			cx18_av_write4(cx, 0x904, 0x08020000);
 			cx18_av_write4(cx, 0x90c, 0x08020000);

 			/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
 			cx18_av_write(cx, 0x127, 0x54);
 			break;

 		case 44100:
 			/* VID_PLL and AUX_PLL */
 			cx18_av_write4(cx, 0x108, 0x1809040f);

 			/* AUX_PLL_FRAC */
 			cx18_av_write4(cx, 0x110, 0x00ec6bd6);

 			/* src1_ctl = 0x08010000 */
 			cx18_av_write4(cx, 0x8f8, 0x080160cd);

 			/* src3/4/6_ctl = 0x08020000 */
 			cx18_av_write4(cx, 0x900, 0x08017385);
 			cx18_av_write4(cx, 0x904, 0x08017385);
 			cx18_av_write4(cx, 0x90c, 0x08017385);
 			break;

 		case 48000:
 			/* VID_PLL and AUX_PLL */
 			cx18_av_write4(cx, 0x108, 0x180a040f);

 			/* AUX_PLL_FRAC */
 			cx18_av_write4(cx, 0x110, 0x0098d6e5);

 			/* src1_ctl = 0x08010000 */
 			cx18_av_write4(cx, 0x8f8, 0x08018000);

 			/* src3/4/6_ctl = 0x08020000 */
 			cx18_av_write4(cx, 0x900, 0x08015555);
 			cx18_av_write4(cx, 0x904, 0x08015555);
 			cx18_av_write4(cx, 0x90c, 0x08015555);
 			break;
 		}
 	}

 	state->audclk_freq = freq;

 	return 0;
 }

 void cx18_av_audio_set_path(struct cx18 *cx)
 {
 	struct cx18_av_state *state = &cx->av_state;

 	/* stop microcontroller */
 	cx18_av_and_or(cx, 0x803, ~0x10, 0);

 	/* assert soft reset */
 	cx18_av_and_or(cx, 0x810, ~0x1, 0x01);

 	/* Mute everything to prevent the PFFT! */
 	cx18_av_write(cx, 0x8d3, 0x1f);

 	if (state->aud_input == CX18_AV_AUDIO_SERIAL) {
 		/* Set Path1 to Serial Audio Input */
 		cx18_av_write4(cx, 0x8d0, 0x01011012);

 		/* The microcontroller should not be started for the
 		 * non-tuner inputs: autodetection is specific for
 		 * TV audio. */
 	} else {
 		/* Set Path1 to Analog Demod Main Channel */
 		cx18_av_write4(cx, 0x8d0, 0x1f063870);
 	}

 	set_audclk_freq(cx, state->audclk_freq);

 	/* deassert soft reset */
 	cx18_av_and_or(cx, 0x810, ~0x1, 0x00);

 	if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
 		/* When the microcontroller detects the
 		 * audio format, it will unmute the lines */
 		cx18_av_and_or(cx, 0x803, ~0x10, 0x10);
 	}
 }

 static int get_volume(struct cx18 *cx)
 {
 	/* Volume runs +18dB to -96dB in 1/2dB steps
 	 * change to fit the msp3400 -114dB to +12dB range */

 	/* check PATH1_VOLUME */
 	int vol = 228 - cx18_av_read(cx, 0x8d4);
 	vol = (vol / 2) + 23;
 	return vol << 9;
 }

 static void set_volume(struct cx18 *cx, int volume)
 {
 	/* First convert the volume to msp3400 values (0-127) */
 	int vol = volume >> 9;
 	/* now scale it up to cx18_av values
 	 * -114dB to -96dB maps to 0
 	 * this should be 19, but in my testing that was 4dB too loud */
 	if (vol <= 23)
 		vol = 0;
 	else
 		vol -= 23;

 	/* PATH1_VOLUME */
 	cx18_av_write(cx, 0x8d4, 228 - (vol * 2));
 }

 static int get_bass(struct cx18 *cx)
 {
 	/* bass is 49 steps +12dB to -12dB */

 	/* check PATH1_EQ_BASS_VOL */
 	int bass = cx18_av_read(cx, 0x8d9) & 0x3f;
 	bass = (((48 - bass) * 0xffff) + 47) / 48;
 	return bass;
 }

 static void set_bass(struct cx18 *cx, int bass)
 {
 	/* PATH1_EQ_BASS_VOL */
 	cx18_av_and_or(cx, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
 }

 static int get_treble(struct cx18 *cx)
 {
 	/* treble is 49 steps +12dB to -12dB */

 	/* check PATH1_EQ_TREBLE_VOL */
 	int treble = cx18_av_read(cx, 0x8db) & 0x3f;
 	treble = (((48 - treble) * 0xffff) + 47) / 48;
 	return treble;
 }

 static void set_treble(struct cx18 *cx, int treble)
 {
 	/* PATH1_EQ_TREBLE_VOL */
 	cx18_av_and_or(cx, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
 }

 static int get_balance(struct cx18 *cx)
 {
 	/* balance is 7 bit, 0 to -96dB */

 	/* check PATH1_BAL_LEVEL */
 	int balance = cx18_av_read(cx, 0x8d5) & 0x7f;
 	/* check PATH1_BAL_LEFT */
 	if ((cx18_av_read(cx, 0x8d5) & 0x80) == 0)
 		balance = 0x80 - balance;
 	else
 		balance = 0x80 + balance;
 	return balance << 8;
 }

 static void set_balance(struct cx18 *cx, int balance)
 {
 	int bal = balance >> 8;
 	if (bal > 0x80) {
 		/* PATH1_BAL_LEFT */
 		cx18_av_and_or(cx, 0x8d5, 0x7f, 0x80);
 		/* PATH1_BAL_LEVEL */
 		cx18_av_and_or(cx, 0x8d5, ~0x7f, bal & 0x7f);
 	} else {
 		/* PATH1_BAL_LEFT */
 		cx18_av_and_or(cx, 0x8d5, 0x7f, 0x00);
 		/* PATH1_BAL_LEVEL */
 		cx18_av_and_or(cx, 0x8d5, ~0x7f, 0x80 - bal);
 	}
 }

 static int get_mute(struct cx18 *cx)
 {
 	/* check SRC1_MUTE_EN */
 	return cx18_av_read(cx, 0x8d3) & 0x2 ? 1 : 0;
 }

 static void set_mute(struct cx18 *cx, int mute)
 {
 	struct cx18_av_state *state = &cx->av_state;

 	if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
 		/* Must turn off microcontroller in order to mute sound.
 		 * Not sure if this is the best method, but it does work.
 		 * If the microcontroller is running, then it will undo any
 		 * changes to the mute register. */
 		if (mute) {
 			/* disable microcontroller */
 			cx18_av_and_or(cx, 0x803, ~0x10, 0x00);
 			cx18_av_write(cx, 0x8d3, 0x1f);
 		} else {
 			/* enable microcontroller */
 			cx18_av_and_or(cx, 0x803, ~0x10, 0x10);
 		}
 	} else {
 		/* SRC1_MUTE_EN */
 		cx18_av_and_or(cx, 0x8d3, ~0x2, mute ? 0x02 : 0x00);
 	}
 }

 int cx18_av_audio(struct cx18 *cx, unsigned int cmd, void *arg)
 {
 	struct cx18_av_state *state = &cx->av_state;
 	struct v4l2_control *ctrl = arg;
 	int retval;

 	switch (cmd) {
 	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
 		if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
 			cx18_av_and_or(cx, 0x803, ~0x10, 0);
 			cx18_av_write(cx, 0x8d3, 0x1f);
 		}
 		cx18_av_and_or(cx, 0x810, ~0x1, 1);
 		retval = set_audclk_freq(cx, *(u32 *)arg);
 		cx18_av_and_or(cx, 0x810, ~0x1, 0);
 		if (state->aud_input != CX18_AV_AUDIO_SERIAL)
 			cx18_av_and_or(cx, 0x803, ~0x10, 0x10);
 		return retval;

 	case VIDIOC_G_CTRL:
 		switch (ctrl->id) {
 		case V4L2_CID_AUDIO_VOLUME:
 			ctrl->value = get_volume(cx);
 			break;
 		case V4L2_CID_AUDIO_BASS:
 			ctrl->value = get_bass(cx);
 			break;
 		case V4L2_CID_AUDIO_TREBLE:
 			ctrl->value = get_treble(cx);
 			break;
 		case V4L2_CID_AUDIO_BALANCE:
 			ctrl->value = get_balance(cx);
 			break;
 		case V4L2_CID_AUDIO_MUTE:
 			ctrl->value = get_mute(cx);
 			break;
 		default:
 			return -EINVAL;
 		}
 		break;

 	case VIDIOC_S_CTRL:
 		switch (ctrl->id) {
 		case V4L2_CID_AUDIO_VOLUME:
 			set_volume(cx, ctrl->value);
 			break;
 		case V4L2_CID_AUDIO_BASS:
 			set_bass(cx, ctrl->value);
 			break;
 		case V4L2_CID_AUDIO_TREBLE:
 			set_treble(cx, ctrl->value);
 			break;
 		case V4L2_CID_AUDIO_BALANCE:
 			set_balance(cx, ctrl->value);
 			break;
 		case V4L2_CID_AUDIO_MUTE:
 			set_mute(cx, ctrl->value);
 			break;
 		default:
 			return -EINVAL;
 		}
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }
	/*
	* cx18 ADEC audio functions
	*
	* Derived from cx25840-audio.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., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*/

	#include "cx18-driver.h"

	static int set_audclk_freq(struct cx18 *cx, u32 freq)
	{
	struct cx18_av_state *state = &cx->av_state;

	if (freq != 32000 && freq != 44100 && freq != 48000)
	return -EINVAL;

	/* common for all inputs and rates */
	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
	cx18_av_write(cx, 0x127, 0x50);

	if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
	switch (freq) {
	case 32000:
	/* VID_PLL and AUX_PLL */
	cx18_av_write4(cx, 0x108, 0x1006040f);

	/* AUX_PLL_FRAC */
	cx18_av_write4(cx, 0x110, 0x01bb39ee);

	/* src3/4/6_ctl = 0x0801f77f */
	cx18_av_write4(cx, 0x900, 0x0801f77f);
	cx18_av_write4(cx, 0x904, 0x0801f77f);
	cx18_av_write4(cx, 0x90c, 0x0801f77f);
	break;

	case 44100:
	/* VID_PLL and AUX_PLL */
	cx18_av_write4(cx, 0x108, 0x1009040f);

	/* AUX_PLL_FRAC */
	cx18_av_write4(cx, 0x110, 0x00ec6bd6);

	/* src3/4/6_ctl = 0x08016d59 */
	cx18_av_write4(cx, 0x900, 0x08016d59);
	cx18_av_write4(cx, 0x904, 0x08016d59);
	cx18_av_write4(cx, 0x90c, 0x08016d59);
	break;

	case 48000:
	/* VID_PLL and AUX_PLL */
	cx18_av_write4(cx, 0x108, 0x100a040f);

	/* AUX_PLL_FRAC */
	cx18_av_write4(cx, 0x110, 0x0098d6e5);

	/* src3/4/6_ctl = 0x08014faa */
	cx18_av_write4(cx, 0x900, 0x08014faa);
	cx18_av_write4(cx, 0x904, 0x08014faa);
	cx18_av_write4(cx, 0x90c, 0x08014faa);
	break;
	}
	} else {
	switch (freq) {
	case 32000:
	/* VID_PLL and AUX_PLL */
	cx18_av_write4(cx, 0x108, 0x1e08040f);

	/* AUX_PLL_FRAC */
	cx18_av_write4(cx, 0x110, 0x012a0869);

	/* src1_ctl = 0x08010000 */
	cx18_av_write4(cx, 0x8f8, 0x08010000);

	/* src3/4/6_ctl = 0x08020000 */
	cx18_av_write4(cx, 0x900, 0x08020000);
	cx18_av_write4(cx, 0x904, 0x08020000);
	cx18_av_write4(cx, 0x90c, 0x08020000);

	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
	cx18_av_write(cx, 0x127, 0x54);
	break;

	case 44100:
	/* VID_PLL and AUX_PLL */
	cx18_av_write4(cx, 0x108, 0x1809040f);

	/* AUX_PLL_FRAC */
	cx18_av_write4(cx, 0x110, 0x00ec6bd6);

	/* src1_ctl = 0x08010000 */
	cx18_av_write4(cx, 0x8f8, 0x080160cd);

	/* src3/4/6_ctl = 0x08020000 */
	cx18_av_write4(cx, 0x900, 0x08017385);
	cx18_av_write4(cx, 0x904, 0x08017385);
	cx18_av_write4(cx, 0x90c, 0x08017385);
	break;

	case 48000:
	/* VID_PLL and AUX_PLL */
	cx18_av_write4(cx, 0x108, 0x180a040f);

	/* AUX_PLL_FRAC */
	cx18_av_write4(cx, 0x110, 0x0098d6e5);

	/* src1_ctl = 0x08010000 */
	cx18_av_write4(cx, 0x8f8, 0x08018000);

	/* src3/4/6_ctl = 0x08020000 */
	cx18_av_write4(cx, 0x900, 0x08015555);
	cx18_av_write4(cx, 0x904, 0x08015555);
	cx18_av_write4(cx, 0x90c, 0x08015555);
	break;
	}
	}

	state->audclk_freq = freq;

	return 0;
	}

	void cx18_av_audio_set_path(struct cx18 *cx)
	{
	struct cx18_av_state *state = &cx->av_state;

	/* stop microcontroller */
	cx18_av_and_or(cx, 0x803, ~0x10, 0);

	/* assert soft reset */
	cx18_av_and_or(cx, 0x810, ~0x1, 0x01);

	/* Mute everything to prevent the PFFT! */
	cx18_av_write(cx, 0x8d3, 0x1f);

	if (state->aud_input == CX18_AV_AUDIO_SERIAL) {
	/* Set Path1 to Serial Audio Input */
	cx18_av_write4(cx, 0x8d0, 0x01011012);

	/* The microcontroller should not be started for the
	* non-tuner inputs: autodetection is specific for
	* TV audio. */
	} else {
	/* Set Path1 to Analog Demod Main Channel */
	cx18_av_write4(cx, 0x8d0, 0x1f063870);
	}

	set_audclk_freq(cx, state->audclk_freq);

	/* deassert soft reset */
	cx18_av_and_or(cx, 0x810, ~0x1, 0x00);

	if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
	/* When the microcontroller detects the
	* audio format, it will unmute the lines */
	cx18_av_and_or(cx, 0x803, ~0x10, 0x10);
	}
	}

	static int get_volume(struct cx18 *cx)
	{
	/* Volume runs +18dB to -96dB in 1/2dB steps
	* change to fit the msp3400 -114dB to +12dB range */

	/* check PATH1_VOLUME */
	int vol = 228 - cx18_av_read(cx, 0x8d4);
	vol = (vol / 2) + 23;
	return vol << 9;
	}

	static void set_volume(struct cx18 *cx, int volume)
	{
	/* First convert the volume to msp3400 values (0-127) */
	int vol = volume >> 9;
	/* now scale it up to cx18_av values
	* -114dB to -96dB maps to 0
	* this should be 19, but in my testing that was 4dB too loud */
	if (vol <= 23)
	vol = 0;
	else
	vol -= 23;

	/* PATH1_VOLUME */
	cx18_av_write(cx, 0x8d4, 228 - (vol * 2));
	}

	static int get_bass(struct cx18 *cx)
	{
	/* bass is 49 steps +12dB to -12dB */

	/* check PATH1_EQ_BASS_VOL */
	int bass = cx18_av_read(cx, 0x8d9) & 0x3f;
	bass = (((48 - bass) * 0xffff) + 47) / 48;
	return bass;
	}

	static void set_bass(struct cx18 *cx, int bass)
	{
	/* PATH1_EQ_BASS_VOL */
	cx18_av_and_or(cx, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
	}

	static int get_treble(struct cx18 *cx)
	{
	/* treble is 49 steps +12dB to -12dB */

	/* check PATH1_EQ_TREBLE_VOL */
	int treble = cx18_av_read(cx, 0x8db) & 0x3f;
	treble = (((48 - treble) * 0xffff) + 47) / 48;
	return treble;
	}

	static void set_treble(struct cx18 *cx, int treble)
	{
	/* PATH1_EQ_TREBLE_VOL */
	cx18_av_and_or(cx, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
	}

	static int get_balance(struct cx18 *cx)
	{
	/* balance is 7 bit, 0 to -96dB */

	/* check PATH1_BAL_LEVEL */
	int balance = cx18_av_read(cx, 0x8d5) & 0x7f;
	/* check PATH1_BAL_LEFT */
	if ((cx18_av_read(cx, 0x8d5) & 0x80) == 0)
	balance = 0x80 - balance;
	else
	balance = 0x80 + balance;
	return balance << 8;
	}

	static void set_balance(struct cx18 *cx, int balance)
	{
	int bal = balance >> 8;
	if (bal > 0x80) {
	/* PATH1_BAL_LEFT */
	cx18_av_and_or(cx, 0x8d5, 0x7f, 0x80);
	/* PATH1_BAL_LEVEL */
	cx18_av_and_or(cx, 0x8d5, ~0x7f, bal & 0x7f);
	} else {
	/* PATH1_BAL_LEFT */
	cx18_av_and_or(cx, 0x8d5, 0x7f, 0x00);
	/* PATH1_BAL_LEVEL */
	cx18_av_and_or(cx, 0x8d5, ~0x7f, 0x80 - bal);
	}
	}

	static int get_mute(struct cx18 *cx)
	{
	/* check SRC1_MUTE_EN */
	return cx18_av_read(cx, 0x8d3) & 0x2 ? 1 : 0;
	}

	static void set_mute(struct cx18 *cx, int mute)
	{
	struct cx18_av_state *state = &cx->av_state;

	if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
	/* Must turn off microcontroller in order to mute sound.
	* Not sure if this is the best method, but it does work.
	* If the microcontroller is running, then it will undo any
	* changes to the mute register. */
	if (mute) {
	/* disable microcontroller */
	cx18_av_and_or(cx, 0x803, ~0x10, 0x00);
	cx18_av_write(cx, 0x8d3, 0x1f);
	} else {
	/* enable microcontroller */
	cx18_av_and_or(cx, 0x803, ~0x10, 0x10);
	}
	} else {
	/* SRC1_MUTE_EN */
	cx18_av_and_or(cx, 0x8d3, ~0x2, mute ? 0x02 : 0x00);
	}
	}

	int cx18_av_audio(struct cx18 cx, unsigned int cmd, void arg)
	{
	struct cx18_av_state *state = &cx->av_state;
	struct v4l2_control *ctrl = arg;
	int retval;

	switch (cmd) {
	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
	if (state->aud_input != CX18_AV_AUDIO_SERIAL) {
	cx18_av_and_or(cx, 0x803, ~0x10, 0);
	cx18_av_write(cx, 0x8d3, 0x1f);
	}
	cx18_av_and_or(cx, 0x810, ~0x1, 1);
	retval = set_audclk_freq(cx, (u32 )arg);
	cx18_av_and_or(cx, 0x810, ~0x1, 0);
	if (state->aud_input != CX18_AV_AUDIO_SERIAL)
	cx18_av_and_or(cx, 0x803, ~0x10, 0x10);
	return retval;

	case VIDIOC_G_CTRL:
	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value = get_volume(cx);
	break;
	case V4L2_CID_AUDIO_BASS:
	ctrl->value = get_bass(cx);
	break;
	case V4L2_CID_AUDIO_TREBLE:
	ctrl->value = get_treble(cx);
	break;
	case V4L2_CID_AUDIO_BALANCE:
	ctrl->value = get_balance(cx);
	break;
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value = get_mute(cx);
	break;
	default:
	return -EINVAL;
	}
	break;

	case VIDIOC_S_CTRL:
	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME:
	set_volume(cx, ctrl->value);
	break;
	case V4L2_CID_AUDIO_BASS:
	set_bass(cx, ctrl->value);
	break;
	case V4L2_CID_AUDIO_TREBLE:
	set_treble(cx, ctrl->value);
	break;
	case V4L2_CID_AUDIO_BALANCE:
	set_balance(cx, ctrl->value);
	break;
	case V4L2_CID_AUDIO_MUTE:
	set_mute(cx, ctrl->value);
	break;
	default:
	return -EINVAL;
	}
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}