drivers/media/video/cx25840/cx25840-audio.c - maze/linux - Git at Google

 /* cx25840 audio functions
  *
  * 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 <linux/videodev2.h>
 #include <linux/i2c.h>
 #include <media/v4l2-common.h>
 #include <media/cx25840.h>

 #include "cx25840-core.h"

 static int set_audclk_freq(struct i2c_client *client, u32 freq)
 {
 	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

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

 	/* common for all inputs and rates */
 	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
 	if (!state->is_cx23885 && !state->is_cx231xx)
 		cx25840_write(client, 0x127, 0x50);

 	if (state->aud_input != CX25840_AUDIO_SERIAL) {
 		switch (freq) {
 		case 32000:
 			if (state->is_cx23885) {
 				/* We don't have register values
 				 * so avoid destroying registers. */
 				break;
 			}

 			if (!state->is_cx231xx) {
 				/* VID_PLL and AUX_PLL */
 				cx25840_write4(client, 0x108, 0x1006040f);

 				/* AUX_PLL_FRAC */
 				cx25840_write4(client, 0x110, 0x01bb39ee);
 			}

 			if (state->is_cx25836)
 				break;

 			/* src3/4/6_ctl = 0x0801f77f */
 			cx25840_write4(client, 0x900, 0x0801f77f);
 			cx25840_write4(client, 0x904, 0x0801f77f);
 			cx25840_write4(client, 0x90c, 0x0801f77f);
 			break;

 		case 44100:
 			if (state->is_cx23885) {
 				/* We don't have register values
 				 * so avoid destroying registers. */
 				break;
 			}

 			if (!state->is_cx231xx) {
 				/* VID_PLL and AUX_PLL */
 				cx25840_write4(client, 0x108, 0x1009040f);

 				/* AUX_PLL_FRAC */
 				cx25840_write4(client, 0x110, 0x00ec6bd6);
 			}

 			if (state->is_cx25836)
 				break;

 			/* src3/4/6_ctl = 0x08016d59 */
 			cx25840_write4(client, 0x900, 0x08016d59);
 			cx25840_write4(client, 0x904, 0x08016d59);
 			cx25840_write4(client, 0x90c, 0x08016d59);
 			break;

 		case 48000:
 			if (state->is_cx23885) {
 				/* We don't have register values
 				 * so avoid destroying registers. */
 				break;
 			}

 			if (!state->is_cx231xx) {
 				/* VID_PLL and AUX_PLL */
 				cx25840_write4(client, 0x108, 0x100a040f);

 				/* AUX_PLL_FRAC */
 				cx25840_write4(client, 0x110, 0x0098d6e5);
 			}

 			if (state->is_cx25836)
 				break;

 			/* src3/4/6_ctl = 0x08014faa */
 			cx25840_write4(client, 0x900, 0x08014faa);
 			cx25840_write4(client, 0x904, 0x08014faa);
 			cx25840_write4(client, 0x90c, 0x08014faa);
 			break;
 		}
 	} else {
 		switch (freq) {
 		case 32000:
 			if (state->is_cx23885) {
 				/* We don't have register values
 				 * so avoid destroying registers. */
 				break;
 			}

 			if (!state->is_cx231xx) {
 				/* VID_PLL and AUX_PLL */
 				cx25840_write4(client, 0x108, 0x1e08040f);

 				/* AUX_PLL_FRAC */
 				cx25840_write4(client, 0x110, 0x012a0869);
 			}

 			if (state->is_cx25836)
 				break;

 			/* src1_ctl = 0x08010000 */
 			cx25840_write4(client, 0x8f8, 0x08010000);

 			/* src3/4/6_ctl = 0x08020000 */
 			cx25840_write4(client, 0x900, 0x08020000);
 			cx25840_write4(client, 0x904, 0x08020000);
 			cx25840_write4(client, 0x90c, 0x08020000);

 			/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
 			cx25840_write(client, 0x127, 0x54);
 			break;

 		case 44100:
 			if (state->is_cx23885) {
 				/* We don't have register values
 				 * so avoid destroying registers. */
 				break;
 			}


 			if (!state->is_cx231xx) {
 				/* VID_PLL and AUX_PLL */
 				cx25840_write4(client, 0x108, 0x1809040f);

 				/* AUX_PLL_FRAC */
 				cx25840_write4(client, 0x110, 0x00ec6bd6);
 			}

 			if (state->is_cx25836)
 				break;

 			/* src1_ctl = 0x08010000 */
 			cx25840_write4(client, 0x8f8, 0x080160cd);

 			/* src3/4/6_ctl = 0x08020000 */
 			cx25840_write4(client, 0x900, 0x08017385);
 			cx25840_write4(client, 0x904, 0x08017385);
 			cx25840_write4(client, 0x90c, 0x08017385);
 			break;

 		case 48000:
 			if (!state->is_cx23885 && !state->is_cx231xx) {
 				/* VID_PLL and AUX_PLL */
 				cx25840_write4(client, 0x108, 0x180a040f);

 				/* AUX_PLL_FRAC */
 				cx25840_write4(client, 0x110, 0x0098d6e5);
 			}

 			if (state->is_cx25836)
 				break;

 			if (!state->is_cx23885 && !state->is_cx231xx) {
 				/* src1_ctl */
 				cx25840_write4(client, 0x8f8, 0x08018000);

 				/* src3/4/6_ctl */
 				cx25840_write4(client, 0x900, 0x08015555);
 				cx25840_write4(client, 0x904, 0x08015555);
 				cx25840_write4(client, 0x90c, 0x08015555);
 			} else {

 				cx25840_write4(client, 0x8f8, 0x0801867c);

 				cx25840_write4(client, 0x900, 0x08014faa);
 				cx25840_write4(client, 0x904, 0x08014faa);
 				cx25840_write4(client, 0x90c, 0x08014faa);
 			}
 			break;
 		}
 	}

 	state->audclk_freq = freq;

 	return 0;
 }

 void cx25840_audio_set_path(struct i2c_client *client)
 {
 	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

 	/* assert soft reset */
 	cx25840_and_or(client, 0x810, ~0x1, 0x01);

 	/* stop microcontroller */
 	cx25840_and_or(client, 0x803, ~0x10, 0);

 	/* Mute everything to prevent the PFFT! */
 	cx25840_write(client, 0x8d3, 0x1f);

 	if (state->aud_input == CX25840_AUDIO_SERIAL) {
 		/* Set Path1 to Serial Audio Input */
 		cx25840_write4(client, 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 */
 		cx25840_write4(client, 0x8d0, 0x1f063870);
 	}

 	set_audclk_freq(client, state->audclk_freq);

 	if (state->aud_input != CX25840_AUDIO_SERIAL) {
 		/* When the microcontroller detects the
 		 * audio format, it will unmute the lines */
 		cx25840_and_or(client, 0x803, ~0x10, 0x10);
 	}

 	/* deassert soft reset */
 	cx25840_and_or(client, 0x810, ~0x1, 0x00);

 	/* Ensure the controller is running when we exit */
 	if (state->is_cx23885 || state->is_cx231xx)
 		cx25840_and_or(client, 0x803, ~0x10, 0x10);
 }

 static int get_volume(struct i2c_client *client)
 {
 	struct cx25840_state *state = to_state(i2c_get_clientdata(client));
 	int vol;

 	if (state->unmute_volume >= 0)
 		return state->unmute_volume;

 	/* Volume runs +18dB to -96dB in 1/2dB steps
 	 * change to fit the msp3400 -114dB to +12dB range */

 	/* check PATH1_VOLUME */
 	vol = 228 - cx25840_read(client, 0x8d4);
 	vol = (vol / 2) + 23;
 	return vol << 9;
 }

 static void set_volume(struct i2c_client *client, int volume)
 {
 	struct cx25840_state *state = to_state(i2c_get_clientdata(client));
 	int vol;

 	if (state->unmute_volume >= 0) {
 		state->unmute_volume = volume;
 		return;
 	}

 	/* Convert the volume to msp3400 values (0-127) */
 	vol = volume >> 9;

 	/* now scale it up to cx25840 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 */
 	cx25840_write(client, 0x8d4, 228 - (vol * 2));
 }

 static int get_bass(struct i2c_client *client)
 {
 	/* bass is 49 steps +12dB to -12dB */

 	/* check PATH1_EQ_BASS_VOL */
 	int bass = cx25840_read(client, 0x8d9) & 0x3f;
 	bass = (((48 - bass) * 0xffff) + 47) / 48;
 	return bass;
 }

 static void set_bass(struct i2c_client *client, int bass)
 {
 	/* PATH1_EQ_BASS_VOL */
 	cx25840_and_or(client, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
 }

 static int get_treble(struct i2c_client *client)
 {
 	/* treble is 49 steps +12dB to -12dB */

 	/* check PATH1_EQ_TREBLE_VOL */
 	int treble = cx25840_read(client, 0x8db) & 0x3f;
 	treble = (((48 - treble) * 0xffff) + 47) / 48;
 	return treble;
 }

 static void set_treble(struct i2c_client *client, int treble)
 {
 	/* PATH1_EQ_TREBLE_VOL */
 	cx25840_and_or(client, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
 }

 static int get_balance(struct i2c_client *client)
 {
 	/* balance is 7 bit, 0 to -96dB */

 	/* check PATH1_BAL_LEVEL */
 	int balance = cx25840_read(client, 0x8d5) & 0x7f;
 	/* check PATH1_BAL_LEFT */
 	if ((cx25840_read(client, 0x8d5) & 0x80) == 0)
 		balance = 0x80 - balance;
 	else
 		balance = 0x80 + balance;
 	return balance << 8;
 }

 static void set_balance(struct i2c_client *client, int balance)
 {
 	int bal = balance >> 8;
 	if (bal > 0x80) {
 		/* PATH1_BAL_LEFT */
 		cx25840_and_or(client, 0x8d5, 0x7f, 0x80);
 		/* PATH1_BAL_LEVEL */
 		cx25840_and_or(client, 0x8d5, ~0x7f, bal & 0x7f);
 	} else {
 		/* PATH1_BAL_LEFT */
 		cx25840_and_or(client, 0x8d5, 0x7f, 0x00);
 		/* PATH1_BAL_LEVEL */
 		cx25840_and_or(client, 0x8d5, ~0x7f, 0x80 - bal);
 	}
 }

 static int get_mute(struct i2c_client *client)
 {
 	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

 	return state->unmute_volume >= 0;
 }

 static void set_mute(struct i2c_client *client, int mute)
 {
 	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

 	if (mute && state->unmute_volume == -1) {
 		int vol = get_volume(client);

 		set_volume(client, 0);
 		state->unmute_volume = vol;
 	}
 	else if (!mute && state->unmute_volume != -1) {
 		int vol = state->unmute_volume;

 		state->unmute_volume = -1;
 		set_volume(client, vol);
 	}
 }

 int cx25840_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	struct cx25840_state *state = to_state(sd);
 	int retval;

 	if (!state->is_cx25836)
 		cx25840_and_or(client, 0x810, ~0x1, 1);
 	if (state->aud_input != CX25840_AUDIO_SERIAL) {
 		cx25840_and_or(client, 0x803, ~0x10, 0);
 		cx25840_write(client, 0x8d3, 0x1f);
 	}
 	retval = set_audclk_freq(client, freq);
 	if (state->aud_input != CX25840_AUDIO_SERIAL)
 		cx25840_and_or(client, 0x803, ~0x10, 0x10);
 	if (!state->is_cx25836)
 		cx25840_and_or(client, 0x810, ~0x1, 0);
 	return retval;
 }

 int cx25840_audio_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_VOLUME:
 		ctrl->value = get_volume(client);
 		break;
 	case V4L2_CID_AUDIO_BASS:
 		ctrl->value = get_bass(client);
 		break;
 	case V4L2_CID_AUDIO_TREBLE:
 		ctrl->value = get_treble(client);
 		break;
 	case V4L2_CID_AUDIO_BALANCE:
 		ctrl->value = get_balance(client);
 		break;
 	case V4L2_CID_AUDIO_MUTE:
 		ctrl->value = get_mute(client);
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 int cx25840_audio_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_VOLUME:
 		set_volume(client, ctrl->value);
 		break;
 	case V4L2_CID_AUDIO_BASS:
 		set_bass(client, ctrl->value);
 		break;
 	case V4L2_CID_AUDIO_TREBLE:
 		set_treble(client, ctrl->value);
 		break;
 	case V4L2_CID_AUDIO_BALANCE:
 		set_balance(client, ctrl->value);
 		break;
 	case V4L2_CID_AUDIO_MUTE:
 		set_mute(client, ctrl->value);
 		break;
 	default:
 		return -EINVAL;
 	}
 	return 0;
 }
	/* cx25840 audio functions
	*
	* 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 <linux/videodev2.h>
	#include <linux/i2c.h>
	#include <media/v4l2-common.h>
	#include <media/cx25840.h>

	#include "cx25840-core.h"

	static int set_audclk_freq(struct i2c_client *client, u32 freq)
	{
	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

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

	/* common for all inputs and rates */
	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x10 */
	if (!state->is_cx23885 && !state->is_cx231xx)
	cx25840_write(client, 0x127, 0x50);

	if (state->aud_input != CX25840_AUDIO_SERIAL) {
	switch (freq) {
	case 32000:
	if (state->is_cx23885) {
	/* We don't have register values
	* so avoid destroying registers. */
	break;
	}

	if (!state->is_cx231xx) {
	/* VID_PLL and AUX_PLL */
	cx25840_write4(client, 0x108, 0x1006040f);

	/* AUX_PLL_FRAC */
	cx25840_write4(client, 0x110, 0x01bb39ee);
	}

	if (state->is_cx25836)
	break;

	/* src3/4/6_ctl = 0x0801f77f */
	cx25840_write4(client, 0x900, 0x0801f77f);
	cx25840_write4(client, 0x904, 0x0801f77f);
	cx25840_write4(client, 0x90c, 0x0801f77f);
	break;

	case 44100:
	if (state->is_cx23885) {
	/* We don't have register values
	* so avoid destroying registers. */
	break;
	}

	if (!state->is_cx231xx) {
	/* VID_PLL and AUX_PLL */
	cx25840_write4(client, 0x108, 0x1009040f);

	/* AUX_PLL_FRAC */
	cx25840_write4(client, 0x110, 0x00ec6bd6);
	}

	if (state->is_cx25836)
	break;

	/* src3/4/6_ctl = 0x08016d59 */
	cx25840_write4(client, 0x900, 0x08016d59);
	cx25840_write4(client, 0x904, 0x08016d59);
	cx25840_write4(client, 0x90c, 0x08016d59);
	break;

	case 48000:
	if (state->is_cx23885) {
	/* We don't have register values
	* so avoid destroying registers. */
	break;
	}

	if (!state->is_cx231xx) {
	/* VID_PLL and AUX_PLL */
	cx25840_write4(client, 0x108, 0x100a040f);

	/* AUX_PLL_FRAC */
	cx25840_write4(client, 0x110, 0x0098d6e5);
	}

	if (state->is_cx25836)
	break;

	/* src3/4/6_ctl = 0x08014faa */
	cx25840_write4(client, 0x900, 0x08014faa);
	cx25840_write4(client, 0x904, 0x08014faa);
	cx25840_write4(client, 0x90c, 0x08014faa);
	break;
	}
	} else {
	switch (freq) {
	case 32000:
	if (state->is_cx23885) {
	/* We don't have register values
	* so avoid destroying registers. */
	break;
	}

	if (!state->is_cx231xx) {
	/* VID_PLL and AUX_PLL */
	cx25840_write4(client, 0x108, 0x1e08040f);

	/* AUX_PLL_FRAC */
	cx25840_write4(client, 0x110, 0x012a0869);
	}

	if (state->is_cx25836)
	break;

	/* src1_ctl = 0x08010000 */
	cx25840_write4(client, 0x8f8, 0x08010000);

	/* src3/4/6_ctl = 0x08020000 */
	cx25840_write4(client, 0x900, 0x08020000);
	cx25840_write4(client, 0x904, 0x08020000);
	cx25840_write4(client, 0x90c, 0x08020000);

	/* SA_MCLK_SEL=1, SA_MCLK_DIV=0x14 */
	cx25840_write(client, 0x127, 0x54);
	break;

	case 44100:
	if (state->is_cx23885) {
	/* We don't have register values
	* so avoid destroying registers. */
	break;
	}


	if (!state->is_cx231xx) {
	/* VID_PLL and AUX_PLL */
	cx25840_write4(client, 0x108, 0x1809040f);

	/* AUX_PLL_FRAC */
	cx25840_write4(client, 0x110, 0x00ec6bd6);
	}

	if (state->is_cx25836)
	break;

	/* src1_ctl = 0x08010000 */
	cx25840_write4(client, 0x8f8, 0x080160cd);

	/* src3/4/6_ctl = 0x08020000 */
	cx25840_write4(client, 0x900, 0x08017385);
	cx25840_write4(client, 0x904, 0x08017385);
	cx25840_write4(client, 0x90c, 0x08017385);
	break;

	case 48000:
	if (!state->is_cx23885 && !state->is_cx231xx) {
	/* VID_PLL and AUX_PLL */
	cx25840_write4(client, 0x108, 0x180a040f);

	/* AUX_PLL_FRAC */
	cx25840_write4(client, 0x110, 0x0098d6e5);
	}

	if (state->is_cx25836)
	break;

	if (!state->is_cx23885 && !state->is_cx231xx) {
	/* src1_ctl */
	cx25840_write4(client, 0x8f8, 0x08018000);

	/* src3/4/6_ctl */
	cx25840_write4(client, 0x900, 0x08015555);
	cx25840_write4(client, 0x904, 0x08015555);
	cx25840_write4(client, 0x90c, 0x08015555);
	} else {

	cx25840_write4(client, 0x8f8, 0x0801867c);

	cx25840_write4(client, 0x900, 0x08014faa);
	cx25840_write4(client, 0x904, 0x08014faa);
	cx25840_write4(client, 0x90c, 0x08014faa);
	}
	break;
	}
	}

	state->audclk_freq = freq;

	return 0;
	}

	void cx25840_audio_set_path(struct i2c_client *client)
	{
	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

	/* assert soft reset */
	cx25840_and_or(client, 0x810, ~0x1, 0x01);

	/* stop microcontroller */
	cx25840_and_or(client, 0x803, ~0x10, 0);

	/* Mute everything to prevent the PFFT! */
	cx25840_write(client, 0x8d3, 0x1f);

	if (state->aud_input == CX25840_AUDIO_SERIAL) {
	/* Set Path1 to Serial Audio Input */
	cx25840_write4(client, 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 */
	cx25840_write4(client, 0x8d0, 0x1f063870);
	}

	set_audclk_freq(client, state->audclk_freq);

	if (state->aud_input != CX25840_AUDIO_SERIAL) {
	/* When the microcontroller detects the
	* audio format, it will unmute the lines */
	cx25840_and_or(client, 0x803, ~0x10, 0x10);
	}

	/* deassert soft reset */
	cx25840_and_or(client, 0x810, ~0x1, 0x00);

	/* Ensure the controller is running when we exit */
	if (state->is_cx23885 \|\| state->is_cx231xx)
	cx25840_and_or(client, 0x803, ~0x10, 0x10);
	}

	static int get_volume(struct i2c_client *client)
	{
	struct cx25840_state *state = to_state(i2c_get_clientdata(client));
	int vol;

	if (state->unmute_volume >= 0)
	return state->unmute_volume;

	/* Volume runs +18dB to -96dB in 1/2dB steps
	* change to fit the msp3400 -114dB to +12dB range */

	/* check PATH1_VOLUME */
	vol = 228 - cx25840_read(client, 0x8d4);
	vol = (vol / 2) + 23;
	return vol << 9;
	}

	static void set_volume(struct i2c_client *client, int volume)
	{
	struct cx25840_state *state = to_state(i2c_get_clientdata(client));
	int vol;

	if (state->unmute_volume >= 0) {
	state->unmute_volume = volume;
	return;
	}

	/* Convert the volume to msp3400 values (0-127) */
	vol = volume >> 9;

	/* now scale it up to cx25840 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 */
	cx25840_write(client, 0x8d4, 228 - (vol * 2));
	}

	static int get_bass(struct i2c_client *client)
	{
	/* bass is 49 steps +12dB to -12dB */

	/* check PATH1_EQ_BASS_VOL */
	int bass = cx25840_read(client, 0x8d9) & 0x3f;
	bass = (((48 - bass) * 0xffff) + 47) / 48;
	return bass;
	}

	static void set_bass(struct i2c_client *client, int bass)
	{
	/* PATH1_EQ_BASS_VOL */
	cx25840_and_or(client, 0x8d9, ~0x3f, 48 - (bass * 48 / 0xffff));
	}

	static int get_treble(struct i2c_client *client)
	{
	/* treble is 49 steps +12dB to -12dB */

	/* check PATH1_EQ_TREBLE_VOL */
	int treble = cx25840_read(client, 0x8db) & 0x3f;
	treble = (((48 - treble) * 0xffff) + 47) / 48;
	return treble;
	}

	static void set_treble(struct i2c_client *client, int treble)
	{
	/* PATH1_EQ_TREBLE_VOL */
	cx25840_and_or(client, 0x8db, ~0x3f, 48 - (treble * 48 / 0xffff));
	}

	static int get_balance(struct i2c_client *client)
	{
	/* balance is 7 bit, 0 to -96dB */

	/* check PATH1_BAL_LEVEL */
	int balance = cx25840_read(client, 0x8d5) & 0x7f;
	/* check PATH1_BAL_LEFT */
	if ((cx25840_read(client, 0x8d5) & 0x80) == 0)
	balance = 0x80 - balance;
	else
	balance = 0x80 + balance;
	return balance << 8;
	}

	static void set_balance(struct i2c_client *client, int balance)
	{
	int bal = balance >> 8;
	if (bal > 0x80) {
	/* PATH1_BAL_LEFT */
	cx25840_and_or(client, 0x8d5, 0x7f, 0x80);
	/* PATH1_BAL_LEVEL */
	cx25840_and_or(client, 0x8d5, ~0x7f, bal & 0x7f);
	} else {
	/* PATH1_BAL_LEFT */
	cx25840_and_or(client, 0x8d5, 0x7f, 0x00);
	/* PATH1_BAL_LEVEL */
	cx25840_and_or(client, 0x8d5, ~0x7f, 0x80 - bal);
	}
	}

	static int get_mute(struct i2c_client *client)
	{
	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

	return state->unmute_volume >= 0;
	}

	static void set_mute(struct i2c_client *client, int mute)
	{
	struct cx25840_state *state = to_state(i2c_get_clientdata(client));

	if (mute && state->unmute_volume == -1) {
	int vol = get_volume(client);

	set_volume(client, 0);
	state->unmute_volume = vol;
	}
	else if (!mute && state->unmute_volume != -1) {
	int vol = state->unmute_volume;

	state->unmute_volume = -1;
	set_volume(client, vol);
	}
	}

	int cx25840_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct cx25840_state *state = to_state(sd);
	int retval;

	if (!state->is_cx25836)
	cx25840_and_or(client, 0x810, ~0x1, 1);
	if (state->aud_input != CX25840_AUDIO_SERIAL) {
	cx25840_and_or(client, 0x803, ~0x10, 0);
	cx25840_write(client, 0x8d3, 0x1f);
	}
	retval = set_audclk_freq(client, freq);
	if (state->aud_input != CX25840_AUDIO_SERIAL)
	cx25840_and_or(client, 0x803, ~0x10, 0x10);
	if (!state->is_cx25836)
	cx25840_and_or(client, 0x810, ~0x1, 0);
	return retval;
	}

	int cx25840_audio_g_ctrl(struct v4l2_subdev sd, struct v4l2_control ctrl)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value = get_volume(client);
	break;
	case V4L2_CID_AUDIO_BASS:
	ctrl->value = get_bass(client);
	break;
	case V4L2_CID_AUDIO_TREBLE:
	ctrl->value = get_treble(client);
	break;
	case V4L2_CID_AUDIO_BALANCE:
	ctrl->value = get_balance(client);
	break;
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value = get_mute(client);
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	int cx25840_audio_s_ctrl(struct v4l2_subdev sd, struct v4l2_control ctrl)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME:
	set_volume(client, ctrl->value);
	break;
	case V4L2_CID_AUDIO_BASS:
	set_bass(client, ctrl->value);
	break;
	case V4L2_CID_AUDIO_TREBLE:
	set_treble(client, ctrl->value);
	break;
	case V4L2_CID_AUDIO_BALANCE:
	set_balance(client, ctrl->value);
	break;
	case V4L2_CID_AUDIO_MUTE:
	set_mute(client, ctrl->value);
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}