sound/i2c/tea6330t.c



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/*
 *  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