sound/i2c/tea6330t.c - linux/kernel/git/viro/vfs - Git at Google


            
            /*

            
             *  Routines for control of the TEA6330T circuit via i2c bus

            
             *  Sound fader control circuit for car radios by Philips Semiconductors

            
             *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>

            
             *

            
             *

            
             *   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/init.h>

            
            #include <linux/slab.h>

            
            #include <linux/module.h>

            
            #include <sound/core.h>

            
            #include <sound/control.h>

            
            #include <sound/tea6330t.h>


            MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");

            
            MODULE_DESCRIPTION("Routines for control of the TEA6330T circuit via i2c bus");

            
            MODULE_LICENSE("GPL");


            #define TEA6330T_ADDR			(0x80>>1) /* fixed address */


            #define TEA6330T_SADDR_VOLUME_LEFT	0x00	/* volume left */

            
            #define TEA6330T_SADDR_VOLUME_RIGHT	0x01	/* volume right */

            
            #define TEA6330T_SADDR_BASS		0x02	/* bass control */

            
            #define TEA6330T_SADDR_TREBLE		0x03	/* treble control */

            
            #define TEA6330T_SADDR_FADER		0x04	/* fader control */

            
            #define   TEA6330T_MFN			0x20	/* mute control for selected channels */

            
            #define   TEA6330T_FCH			0x10	/* select fader channels - front or rear */

            
            #define TEA6330T_SADDR_AUDIO_SWITCH	0x05	/* audio switch */

            
            #define   TEA6330T_GMU			0x80	/* mute control, general mute */

            
            #define   TEA6330T_EQN			0x40	/* equalizer switchover (0=equalizer-on) */


            struct tea6330t {

            
            	struct snd_i2c_device *device;

            
            	struct snd_i2c_bus *bus;

            
            	int equalizer;

            
            	int fader;

            
            	unsigned char regs[8];

            
            	unsigned char mleft, mright;

            
            	unsigned char bass, treble;

            
            	unsigned char max_bass, max_treble;

            
            };


            int snd_tea6330t_detect(struct snd_i2c_bus *bus, int equalizer)

            
            {

            
            	int res;


            	snd_i2c_lock(bus);

            
            	res = snd_i2c_probeaddr(bus, TEA6330T_ADDR);

            
            	snd_i2c_unlock(bus);

            
            	return res;

            
            }


            #if 0

            
            static void snd_tea6330t_set(struct tea6330t *tea,

            
            			     unsigned char addr, unsigned char value)

            
            {

            
            #if 0

            
            	printk(KERN_DEBUG "set - 0x%x/0x%x\n", addr, value);

            
            #endif

            
            	snd_i2c_write(tea->bus, TEA6330T_ADDR, addr, value, 1);

            
            }

            
            #endif


            #define TEA6330T_MASTER_VOLUME(xname, xindex) \

            
            { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \

            
              .info = snd_tea6330t_info_master_volume, \

            
              .get = snd_tea6330t_get_master_volume, .put = snd_tea6330t_put_master_volume }


            static int snd_tea6330t_info_master_volume(struct snd_kcontrol *kcontrol,

            
            					   struct snd_ctl_elem_info *uinfo)

            
            {

            
            	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

            
            	uinfo->count = 2;

            
            	uinfo->value.integer.min = 0;

            
            	uinfo->value.integer.max = 43;

            
            	return 0;

            
            }


            static int snd_tea6330t_get_master_volume(struct snd_kcontrol *kcontrol,

            
            					  struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);


            	snd_i2c_lock(tea->bus);

            
            	ucontrol->value.integer.value[0] = tea->mleft - 0x14;

            
            	ucontrol->value.integer.value[1] = tea->mright - 0x14;

            
            	snd_i2c_unlock(tea->bus);

            
            	return 0;

            
            }


            static int snd_tea6330t_put_master_volume(struct snd_kcontrol *kcontrol,

            
            					  struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

            
            	int change, count, err;

            
            	unsigned char bytes[3];

            
            	unsigned char val1, val2;


            	val1 = (ucontrol->value.integer.value[0] % 44) + 0x14;

            
            	val2 = (ucontrol->value.integer.value[1] % 44) + 0x14;

            
            	snd_i2c_lock(tea->bus);

            
            	change = val1 != tea->mleft || val2 != tea->mright;

            
            	tea->mleft = val1;

            
            	tea->mright = val2;

            
            	count = 0;

            
            	if (tea->regs[TEA6330T_SADDR_VOLUME_LEFT] != 0) {

            
            		bytes[count++] = TEA6330T_SADDR_VOLUME_LEFT;

            
            		bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = tea->mleft;

            
            	}

            
            	if (tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] != 0) {

            
            		if (count == 0)

            
            			bytes[count++] = TEA6330T_SADDR_VOLUME_RIGHT;

            
            		bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = tea->mright;

            
            	}

            
            	if (count > 0) {

            
            		if ((err = snd_i2c_sendbytes(tea->device, bytes, count)) < 0)

            
            			change = err;

            
            	}

            
            	snd_i2c_unlock(tea->bus);

            
            	return change;

            
            }


            #define TEA6330T_MASTER_SWITCH(xname, xindex) \

            
            { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \

            
              .info = snd_tea6330t_info_master_switch, \

            
              .get = snd_tea6330t_get_master_switch, .put = snd_tea6330t_put_master_switch }


            #define snd_tea6330t_info_master_switch		snd_ctl_boolean_stereo_info


            static int snd_tea6330t_get_master_switch(struct snd_kcontrol *kcontrol,

            
            					  struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);


            	snd_i2c_lock(tea->bus);

            
            	ucontrol->value.integer.value[0] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;

            
            	ucontrol->value.integer.value[1] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;

            
            	snd_i2c_unlock(tea->bus);

            
            	return 0;

            
            }


            static int snd_tea6330t_put_master_switch(struct snd_kcontrol *kcontrol,

            
            					  struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

            
            	int change, err;

            
            	unsigned char bytes[3];

            
            	unsigned char oval1, oval2, val1, val2;


            	val1 = ucontrol->value.integer.value[0] & 1;

            
            	val2 = ucontrol->value.integer.value[1] & 1;

            
            	snd_i2c_lock(tea->bus);

            
            	oval1 = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;

            
            	oval2 = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;

            
            	change = val1 != oval1 || val2 != oval2;

            
            	tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = val1 ? tea->mleft : 0;

            
            	tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = val2 ? tea->mright : 0;

            
            	bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;

            
            	bytes[1] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT];

            
            	bytes[2] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT];

            
            	if ((err = snd_i2c_sendbytes(tea->device, bytes, 3)) < 0)

            
            		change = err;

            
            	snd_i2c_unlock(tea->bus);

            
            	return change;

            
            }


            #define TEA6330T_BASS(xname, xindex) \

            
            { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \

            
              .info = snd_tea6330t_info_bass, \

            
              .get = snd_tea6330t_get_bass, .put = snd_tea6330t_put_bass }


            static int snd_tea6330t_info_bass(struct snd_kcontrol *kcontrol,

            
            				  struct snd_ctl_elem_info *uinfo)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);


            	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

            
            	uinfo->count = 1;

            
            	uinfo->value.integer.min = 0;

            
            	uinfo->value.integer.max = tea->max_bass;

            
            	return 0;

            
            }


            static int snd_tea6330t_get_bass(struct snd_kcontrol *kcontrol,

            
            				 struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);


            	ucontrol->value.integer.value[0] = tea->bass;

            
            	return 0;

            
            }


            static int snd_tea6330t_put_bass(struct snd_kcontrol *kcontrol,

            
            				 struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

            
            	int change, err;

            
            	unsigned char bytes[2];

            
            	unsigned char val1;


            	val1 = ucontrol->value.integer.value[0] % (tea->max_bass + 1);

            
            	snd_i2c_lock(tea->bus);

            
            	tea->bass = val1;

            
            	val1 += tea->equalizer ? 7 : 3;

            
            	change = tea->regs[TEA6330T_SADDR_BASS] != val1;

            
            	bytes[0] = TEA6330T_SADDR_BASS;

            
            	bytes[1] = tea->regs[TEA6330T_SADDR_BASS] = val1;

            
            	if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)

            
            		change = err;

            
            	snd_i2c_unlock(tea->bus);

            
            	return change;

            
            }


            #define TEA6330T_TREBLE(xname, xindex) \

            
            { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \

            
              .info = snd_tea6330t_info_treble, \

            
              .get = snd_tea6330t_get_treble, .put = snd_tea6330t_put_treble }


            static int snd_tea6330t_info_treble(struct snd_kcontrol *kcontrol,

            
            				    struct snd_ctl_elem_info *uinfo)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);


            	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

            
            	uinfo->count = 1;

            
            	uinfo->value.integer.min = 0;

            
            	uinfo->value.integer.max = tea->max_treble;

            
            	return 0;

            
            }


            static int snd_tea6330t_get_treble(struct snd_kcontrol *kcontrol,

            
            				   struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);


            	ucontrol->value.integer.value[0] = tea->treble;

            
            	return 0;

            
            }


            static int snd_tea6330t_put_treble(struct snd_kcontrol *kcontrol,

            
            				   struct snd_ctl_elem_value *ucontrol)

            
            {

            
            	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

            
            	int change, err;

            
            	unsigned char bytes[2];

            
            	unsigned char val1;


            	val1 = ucontrol->value.integer.value[0] % (tea->max_treble + 1);

            
            	snd_i2c_lock(tea->bus);

            
            	tea->treble = val1;

            
            	val1 += 3;

            
            	change = tea->regs[TEA6330T_SADDR_TREBLE] != val1;

            
            	bytes[0] = TEA6330T_SADDR_TREBLE;

            
            	bytes[1] = tea->regs[TEA6330T_SADDR_TREBLE] = val1;

            
            	if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)

            
            		change = err;

            
            	snd_i2c_unlock(tea->bus);

            
            	return change;

            
            }


            static struct snd_kcontrol_new snd_tea6330t_controls[] = {

            
            TEA6330T_MASTER_SWITCH("Master Playback Switch", 0),

            
            TEA6330T_MASTER_VOLUME("Master Playback Volume", 0),

            
            TEA6330T_BASS("Tone Control - Bass", 0),

            
            TEA6330T_TREBLE("Tone Control - Treble", 0)

            
            };


            static void snd_tea6330_free(struct snd_i2c_device *device)

            
            {

            
            	kfree(device->private_data);

            
            }


            int snd_tea6330t_update_mixer(struct snd_card *card,

            
            			      struct snd_i2c_bus *bus,

            
            			      int equalizer, int fader)

            
            {

            
            	struct snd_i2c_device *device;

            
            	struct tea6330t *tea;

            
            	struct snd_kcontrol_new *knew;

            
            	unsigned int idx;

            
            	int err = -ENOMEM;

            
            	u8 default_treble, default_bass;

            
            	unsigned char bytes[7];


            	tea = kzalloc(sizeof(*tea), GFP_KERNEL);

            
            	if (tea == NULL)

            
            		return -ENOMEM;

            
            	if ((err = snd_i2c_device_create(bus, "TEA6330T", TEA6330T_ADDR, &device)) < 0) {

            
            		kfree(tea);

            
            		return err;

            
            	}

            
            	tea->device = device;

            
            	tea->bus = bus;

            
            	tea->equalizer = equalizer;

            
            	tea->fader = fader;

            
            	device->private_data = tea;

            
            	device->private_free = snd_tea6330_free;


            	snd_i2c_lock(bus);


            	/* turn fader off and handle equalizer */

            
            	tea->regs[TEA6330T_SADDR_FADER] = 0x3f;

            
            	tea->regs[TEA6330T_SADDR_AUDIO_SWITCH] = equalizer ? 0 : TEA6330T_EQN;

            
            	/* initialize mixer */

            
            	if (!tea->equalizer) {

            
            		tea->max_bass = 9;

            
            		tea->max_treble = 8;

            
            		default_bass = 3 + 4;

            
            		tea->bass = 4;

            
            		default_treble = 3 + 4;

            
            		tea->treble = 4;

            
            	} else {

            
            		tea->max_bass = 5;

            
            		tea->max_treble = 0;

            
            		default_bass = 7 + 4;

            
            		tea->bass = 4;

            
            		default_treble = 3;

            
            		tea->treble = 0;

            
            	}

            
            	tea->mleft = tea->mright = 0x14;

            
            	tea->regs[TEA6330T_SADDR_BASS] = default_bass;

            
            	tea->regs[TEA6330T_SADDR_TREBLE] = default_treble;


            	/* compose I2C message and put the hardware to initial state */

            
            	bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;

            
            	for (idx = 0; idx < 6; idx++)

            
            		bytes[idx+1] = tea->regs[idx];

            
            	if ((err = snd_i2c_sendbytes(device, bytes, 7)) < 0)

            
            		goto __error;


            	strcat(card->mixername, ",TEA6330T");

            
            	if ((err = snd_component_add(card, "TEA6330T")) < 0)

            
            		goto __error;


            	for (idx = 0; idx < ARRAY_SIZE(snd_tea6330t_controls); idx++) {

            
            		knew = &snd_tea6330t_controls[idx];

            
            		if (tea->treble == 0 && !strcmp(knew->name, "Tone Control - Treble"))

            
            			continue;

            
            		if ((err = snd_ctl_add(card, snd_ctl_new1(knew, tea))) < 0)

            
            			goto __error;

            
            	}


            	snd_i2c_unlock(bus);

            
            	return 0;


                  __error:

            
                  	snd_i2c_unlock(bus);

            
                  	snd_i2c_device_free(device);

            
                  	return err;

            
            }


            EXPORT_SYMBOL(snd_tea6330t_detect);

            
            EXPORT_SYMBOL(snd_tea6330t_update_mixer);
	/*
	* Routines for control of the TEA6330T circuit via i2c bus
	* Sound fader control circuit for car radios by Philips Semiconductors
	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
	*
	*
	* 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/init.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <sound/core.h>
	#include <sound/control.h>
	#include <sound/tea6330t.h>

	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
	MODULE_DESCRIPTION("Routines for control of the TEA6330T circuit via i2c bus");
	MODULE_LICENSE("GPL");

	#define TEA6330T_ADDR (0x80>>1) /* fixed address */

	#define TEA6330T_SADDR_VOLUME_LEFT 0x00 /* volume left */
	#define TEA6330T_SADDR_VOLUME_RIGHT 0x01 /* volume right */
	#define TEA6330T_SADDR_BASS 0x02 /* bass control */
	#define TEA6330T_SADDR_TREBLE 0x03 /* treble control */
	#define TEA6330T_SADDR_FADER 0x04 /* fader control */
	#define TEA6330T_MFN 0x20 /* mute control for selected channels */
	#define TEA6330T_FCH 0x10 /* select fader channels - front or rear */
	#define TEA6330T_SADDR_AUDIO_SWITCH 0x05 /* audio switch */
	#define TEA6330T_GMU 0x80 /* mute control, general mute */
	#define TEA6330T_EQN 0x40 /* equalizer switchover (0=equalizer-on) */


	struct tea6330t {
	struct snd_i2c_device *device;
	struct snd_i2c_bus *bus;
	int equalizer;
	int fader;
	unsigned char regs[8];
	unsigned char mleft, mright;
	unsigned char bass, treble;
	unsigned char max_bass, max_treble;
	};


	int snd_tea6330t_detect(struct snd_i2c_bus *bus, int equalizer)
	{
	int res;

	snd_i2c_lock(bus);
	res = snd_i2c_probeaddr(bus, TEA6330T_ADDR);
	snd_i2c_unlock(bus);
	return res;
	}

	#if 0
	static void snd_tea6330t_set(struct tea6330t *tea,
	unsigned char addr, unsigned char value)
	{
	#if 0
	printk(KERN_DEBUG "set - 0x%x/0x%x\n", addr, value);
	#endif
	snd_i2c_write(tea->bus, TEA6330T_ADDR, addr, value, 1);
	}
	#endif

	#define TEA6330T_MASTER_VOLUME(xname, xindex) \
	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
	.info = snd_tea6330t_info_master_volume, \
	.get = snd_tea6330t_get_master_volume, .put = snd_tea6330t_put_master_volume }

	static int snd_tea6330t_info_master_volume(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo)
	{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 43;
	return 0;
	}

	static int snd_tea6330t_get_master_volume(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

	snd_i2c_lock(tea->bus);
	ucontrol->value.integer.value[0] = tea->mleft - 0x14;
	ucontrol->value.integer.value[1] = tea->mright - 0x14;
	snd_i2c_unlock(tea->bus);
	return 0;
	}

	static int snd_tea6330t_put_master_volume(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
	int change, count, err;
	unsigned char bytes[3];
	unsigned char val1, val2;

	val1 = (ucontrol->value.integer.value[0] % 44) + 0x14;
	val2 = (ucontrol->value.integer.value[1] % 44) + 0x14;
	snd_i2c_lock(tea->bus);
	change = val1 != tea->mleft \|\| val2 != tea->mright;
	tea->mleft = val1;
	tea->mright = val2;
	count = 0;
	if (tea->regs[TEA6330T_SADDR_VOLUME_LEFT] != 0) {
	bytes[count++] = TEA6330T_SADDR_VOLUME_LEFT;
	bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = tea->mleft;
	}
	if (tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] != 0) {
	if (count == 0)
	bytes[count++] = TEA6330T_SADDR_VOLUME_RIGHT;
	bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = tea->mright;
	}
	if (count > 0) {
	if ((err = snd_i2c_sendbytes(tea->device, bytes, count)) < 0)
	change = err;
	}
	snd_i2c_unlock(tea->bus);
	return change;
	}

	#define TEA6330T_MASTER_SWITCH(xname, xindex) \
	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
	.info = snd_tea6330t_info_master_switch, \
	.get = snd_tea6330t_get_master_switch, .put = snd_tea6330t_put_master_switch }

	#define snd_tea6330t_info_master_switch snd_ctl_boolean_stereo_info

	static int snd_tea6330t_get_master_switch(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

	snd_i2c_lock(tea->bus);
	ucontrol->value.integer.value[0] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;
	ucontrol->value.integer.value[1] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;
	snd_i2c_unlock(tea->bus);
	return 0;
	}

	static int snd_tea6330t_put_master_switch(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
	int change, err;
	unsigned char bytes[3];
	unsigned char oval1, oval2, val1, val2;

	val1 = ucontrol->value.integer.value[0] & 1;
	val2 = ucontrol->value.integer.value[1] & 1;
	snd_i2c_lock(tea->bus);
	oval1 = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;
	oval2 = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;
	change = val1 != oval1 \|\| val2 != oval2;
	tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = val1 ? tea->mleft : 0;
	tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = val2 ? tea->mright : 0;
	bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;
	bytes[1] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT];
	bytes[2] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT];
	if ((err = snd_i2c_sendbytes(tea->device, bytes, 3)) < 0)
	change = err;
	snd_i2c_unlock(tea->bus);
	return change;
	}

	#define TEA6330T_BASS(xname, xindex) \
	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
	.info = snd_tea6330t_info_bass, \
	.get = snd_tea6330t_get_bass, .put = snd_tea6330t_put_bass }

	static int snd_tea6330t_info_bass(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = tea->max_bass;
	return 0;
	}

	static int snd_tea6330t_get_bass(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

	ucontrol->value.integer.value[0] = tea->bass;
	return 0;
	}

	static int snd_tea6330t_put_bass(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
	int change, err;
	unsigned char bytes[2];
	unsigned char val1;

	val1 = ucontrol->value.integer.value[0] % (tea->max_bass + 1);
	snd_i2c_lock(tea->bus);
	tea->bass = val1;
	val1 += tea->equalizer ? 7 : 3;
	change = tea->regs[TEA6330T_SADDR_BASS] != val1;
	bytes[0] = TEA6330T_SADDR_BASS;
	bytes[1] = tea->regs[TEA6330T_SADDR_BASS] = val1;
	if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)
	change = err;
	snd_i2c_unlock(tea->bus);
	return change;
	}

	#define TEA6330T_TREBLE(xname, xindex) \
	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
	.info = snd_tea6330t_info_treble, \
	.get = snd_tea6330t_get_treble, .put = snd_tea6330t_put_treble }

	static int snd_tea6330t_info_treble(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_info *uinfo)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = tea->max_treble;
	return 0;
	}

	static int snd_tea6330t_get_treble(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);

	ucontrol->value.integer.value[0] = tea->treble;
	return 0;
	}

	static int snd_tea6330t_put_treble(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
	int change, err;
	unsigned char bytes[2];
	unsigned char val1;

	val1 = ucontrol->value.integer.value[0] % (tea->max_treble + 1);
	snd_i2c_lock(tea->bus);
	tea->treble = val1;
	val1 += 3;
	change = tea->regs[TEA6330T_SADDR_TREBLE] != val1;
	bytes[0] = TEA6330T_SADDR_TREBLE;
	bytes[1] = tea->regs[TEA6330T_SADDR_TREBLE] = val1;
	if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)
	change = err;
	snd_i2c_unlock(tea->bus);
	return change;
	}

	static struct snd_kcontrol_new snd_tea6330t_controls[] = {
	TEA6330T_MASTER_SWITCH("Master Playback Switch", 0),
	TEA6330T_MASTER_VOLUME("Master Playback Volume", 0),
	TEA6330T_BASS("Tone Control - Bass", 0),
	TEA6330T_TREBLE("Tone Control - Treble", 0)
	};

	static void snd_tea6330_free(struct snd_i2c_device *device)
	{
	kfree(device->private_data);
	}

	int snd_tea6330t_update_mixer(struct snd_card *card,
	struct snd_i2c_bus *bus,
	int equalizer, int fader)
	{
	struct snd_i2c_device *device;
	struct tea6330t *tea;
	struct snd_kcontrol_new *knew;
	unsigned int idx;
	int err = -ENOMEM;
	u8 default_treble, default_bass;
	unsigned char bytes[7];

	tea = kzalloc(sizeof(*tea), GFP_KERNEL);
	if (tea == NULL)
	return -ENOMEM;
	if ((err = snd_i2c_device_create(bus, "TEA6330T", TEA6330T_ADDR, &device)) < 0) {
	kfree(tea);
	return err;
	}
	tea->device = device;
	tea->bus = bus;
	tea->equalizer = equalizer;
	tea->fader = fader;
	device->private_data = tea;
	device->private_free = snd_tea6330_free;

	snd_i2c_lock(bus);

	/* turn fader off and handle equalizer */
	tea->regs[TEA6330T_SADDR_FADER] = 0x3f;
	tea->regs[TEA6330T_SADDR_AUDIO_SWITCH] = equalizer ? 0 : TEA6330T_EQN;
	/* initialize mixer */
	if (!tea->equalizer) {
	tea->max_bass = 9;
	tea->max_treble = 8;
	default_bass = 3 + 4;
	tea->bass = 4;
	default_treble = 3 + 4;
	tea->treble = 4;
	} else {
	tea->max_bass = 5;
	tea->max_treble = 0;
	default_bass = 7 + 4;
	tea->bass = 4;
	default_treble = 3;
	tea->treble = 0;
	}
	tea->mleft = tea->mright = 0x14;
	tea->regs[TEA6330T_SADDR_BASS] = default_bass;
	tea->regs[TEA6330T_SADDR_TREBLE] = default_treble;

	/* compose I2C message and put the hardware to initial state */
	bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;
	for (idx = 0; idx < 6; idx++)
	bytes[idx+1] = tea->regs[idx];
	if ((err = snd_i2c_sendbytes(device, bytes, 7)) < 0)
	goto __error;

	strcat(card->mixername, ",TEA6330T");
	if ((err = snd_component_add(card, "TEA6330T")) < 0)
	goto __error;

	for (idx = 0; idx < ARRAY_SIZE(snd_tea6330t_controls); idx++) {
	knew = &snd_tea6330t_controls[idx];
	if (tea->treble == 0 && !strcmp(knew->name, "Tone Control - Treble"))
	continue;
	if ((err = snd_ctl_add(card, snd_ctl_new1(knew, tea))) < 0)
	goto __error;
	}

	snd_i2c_unlock(bus);
	return 0;

	__error:
	snd_i2c_unlock(bus);
	snd_i2c_device_free(device);
	return err;
	}

	EXPORT_SYMBOL(snd_tea6330t_detect);
	EXPORT_SYMBOL(snd_tea6330t_update_mixer);