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tea6330t.c

/*
 *  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 <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);

/*
 *  INIT part
 */

static int __init alsa_tea6330t_init(void)
{
      return 0;
}

static void __exit alsa_tea6330t_exit(void)
{
}

module_init(alsa_tea6330t_init)
module_exit(alsa_tea6330t_exit)

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