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tpa6130a2.c

/*
 * ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
 *
 * Copyright (C) Nokia Corporation
 *
 * Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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 St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <sound/tpa6130a2-plat.h>
#include <sound/soc.h>
#include <sound/tlv.h>

#include "tpa6130a2.h"

static struct i2c_client *tpa6130a2_client;

/* This struct is used to save the context */
00039 struct tpa6130a2_data {
      struct mutex mutex;
      unsigned char regs[TPA6130A2_CACHEREGNUM];
      struct regulator *supply;
      int power_gpio;
      u8 power_state:1;
      enum tpa_model id;
};

static int tpa6130a2_i2c_read(int reg)
{
      struct tpa6130a2_data *data;
      int val;

      BUG_ON(tpa6130a2_client == NULL);
      data = i2c_get_clientdata(tpa6130a2_client);

      /* If powered off, return the cached value */
      if (data->power_state) {
            val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
            if (val < 0)
                  dev_err(&tpa6130a2_client->dev, "Read failed\n");
            else
                  data->regs[reg] = val;
      } else {
            val = data->regs[reg];
      }

      return val;
}

static int tpa6130a2_i2c_write(int reg, u8 value)
{
      struct tpa6130a2_data *data;
      int val = 0;

      BUG_ON(tpa6130a2_client == NULL);
      data = i2c_get_clientdata(tpa6130a2_client);

      if (data->power_state) {
            val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
            if (val < 0) {
                  dev_err(&tpa6130a2_client->dev, "Write failed\n");
                  return val;
            }
      }

      /* Either powered on or off, we save the context */
      data->regs[reg] = value;

      return val;
}

static u8 tpa6130a2_read(int reg)
{
      struct tpa6130a2_data *data;

      BUG_ON(tpa6130a2_client == NULL);
      data = i2c_get_clientdata(tpa6130a2_client);

      return data->regs[reg];
}

static int tpa6130a2_initialize(void)
{
      struct tpa6130a2_data *data;
      int i, ret = 0;

      BUG_ON(tpa6130a2_client == NULL);
      data = i2c_get_clientdata(tpa6130a2_client);

      for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
            ret = tpa6130a2_i2c_write(i, data->regs[i]);
            if (ret < 0)
                  break;
      }

      return ret;
}

static int tpa6130a2_power(u8 power)
{
      struct      tpa6130a2_data *data;
      u8    val;
      int   ret = 0;

      BUG_ON(tpa6130a2_client == NULL);
      data = i2c_get_clientdata(tpa6130a2_client);

      mutex_lock(&data->mutex);
      if (power == data->power_state)
            goto exit;

      if (power) {
            ret = regulator_enable(data->supply);
            if (ret != 0) {
                  dev_err(&tpa6130a2_client->dev,
                        "Failed to enable supply: %d\n", ret);
                  goto exit;
            }
            /* Power on */
            if (data->power_gpio >= 0)
                  gpio_set_value(data->power_gpio, 1);

            data->power_state = 1;
            ret = tpa6130a2_initialize();
            if (ret < 0) {
                  dev_err(&tpa6130a2_client->dev,
                        "Failed to initialize chip\n");
                  if (data->power_gpio >= 0)
                        gpio_set_value(data->power_gpio, 0);
                  regulator_disable(data->supply);
                  data->power_state = 0;
                  goto exit;
            }
      } else {
            /* set SWS */
            val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
            val |= TPA6130A2_SWS;
            tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);

            /* Power off */
            if (data->power_gpio >= 0)
                  gpio_set_value(data->power_gpio, 0);

            ret = regulator_disable(data->supply);
            if (ret != 0) {
                  dev_err(&tpa6130a2_client->dev,
                        "Failed to disable supply: %d\n", ret);
                  goto exit;
            }

            data->power_state = 0;
      }

exit:
      mutex_unlock(&data->mutex);
      return ret;
}

static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct soc_mixer_control *mc =
            (struct soc_mixer_control *)kcontrol->private_value;
      struct tpa6130a2_data *data;
      unsigned int reg = mc->reg;
      unsigned int shift = mc->shift;
      int max = mc->max;
      unsigned int mask = (1 << fls(max)) - 1;
      unsigned int invert = mc->invert;

      BUG_ON(tpa6130a2_client == NULL);
      data = i2c_get_clientdata(tpa6130a2_client);

      mutex_lock(&data->mutex);

      ucontrol->value.integer.value[0] =
            (tpa6130a2_read(reg) >> shift) & mask;

      if (invert)
            ucontrol->value.integer.value[0] =
                  max - ucontrol->value.integer.value[0];

      mutex_unlock(&data->mutex);
      return 0;
}

static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_value *ucontrol)
{
      struct soc_mixer_control *mc =
            (struct soc_mixer_control *)kcontrol->private_value;
      struct tpa6130a2_data *data;
      unsigned int reg = mc->reg;
      unsigned int shift = mc->shift;
      int max = mc->max;
      unsigned int mask = (1 << fls(max)) - 1;
      unsigned int invert = mc->invert;
      unsigned int val = (ucontrol->value.integer.value[0] & mask);
      unsigned int val_reg;

      BUG_ON(tpa6130a2_client == NULL);
      data = i2c_get_clientdata(tpa6130a2_client);

      if (invert)
            val = max - val;

      mutex_lock(&data->mutex);

      val_reg = tpa6130a2_read(reg);
      if (((val_reg >> shift) & mask) == val) {
            mutex_unlock(&data->mutex);
            return 0;
      }

      val_reg &= ~(mask << shift);
      val_reg |= val << shift;
      tpa6130a2_i2c_write(reg, val_reg);

      mutex_unlock(&data->mutex);

      return 1;
}

/*
 * TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
 * down in gain.
 */
static const unsigned int tpa6130_tlv[] = {
      TLV_DB_RANGE_HEAD(10),
      0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
      2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
      4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
      6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
      8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
      10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
      12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
      14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
      21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
      38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
};

static const struct snd_kcontrol_new tpa6130a2_controls[] = {
      SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
                   TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
                   tpa6130a2_get_volsw, tpa6130a2_put_volsw,
                   tpa6130_tlv),
};

static const unsigned int tpa6140_tlv[] = {
      TLV_DB_RANGE_HEAD(3),
      0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
      9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
      17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
};

static const struct snd_kcontrol_new tpa6140a2_controls[] = {
      SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
                   TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
                   tpa6130a2_get_volsw, tpa6130a2_put_volsw,
                   tpa6140_tlv),
};

/*
 * Enable or disable channel (left or right)
 * The bit number for mute and amplifier are the same per channel:
 * bit 6: Right channel
 * bit 7: Left channel
 * in both registers.
 */
static void tpa6130a2_channel_enable(u8 channel, int enable)
{
      u8    val;

      if (enable) {
            /* Enable channel */
            /* Enable amplifier */
            val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
            val |= channel;
            val &= ~TPA6130A2_SWS;
            tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);

            /* Unmute channel */
            val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
            val &= ~channel;
            tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
      } else {
            /* Disable channel */
            /* Mute channel */
            val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
            val |= channel;
            tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);

            /* Disable amplifier */
            val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
            val &= ~channel;
            tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
      }
}

int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
{
      int ret = 0;
      if (enable) {
            ret = tpa6130a2_power(1);
            if (ret < 0)
                  return ret;
            tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
                               1);
      } else {
            tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
                               0);
            ret = tpa6130a2_power(0);
      }

      return ret;
}
EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);

int tpa6130a2_add_controls(struct snd_soc_codec *codec)
{
      struct      tpa6130a2_data *data;

      if (tpa6130a2_client == NULL)
            return -ENODEV;

      data = i2c_get_clientdata(tpa6130a2_client);

      if (data->id == TPA6140A2)
            return snd_soc_add_controls(codec, tpa6140a2_controls,
                                    ARRAY_SIZE(tpa6140a2_controls));
      else
            return snd_soc_add_controls(codec, tpa6130a2_controls,
                                    ARRAY_SIZE(tpa6130a2_controls));
}
EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);

static int __devinit tpa6130a2_probe(struct i2c_client *client,
                             const struct i2c_device_id *id)
{
      struct device *dev;
      struct tpa6130a2_data *data;
      struct tpa6130a2_platform_data *pdata;
      const char *regulator;
      int ret;

      dev = &client->dev;

      if (client->dev.platform_data == NULL) {
            dev_err(dev, "Platform data not set\n");
            dump_stack();
            return -ENODEV;
      }

      data = kzalloc(sizeof(*data), GFP_KERNEL);
      if (data == NULL) {
            dev_err(dev, "Can not allocate memory\n");
            return -ENOMEM;
      }

      tpa6130a2_client = client;

      i2c_set_clientdata(tpa6130a2_client, data);

      pdata = client->dev.platform_data;
      data->power_gpio = pdata->power_gpio;
      data->id = pdata->id;

      mutex_init(&data->mutex);

      /* Set default register values */
      data->regs[TPA6130A2_REG_CONTROL] = TPA6130A2_SWS;
      data->regs[TPA6130A2_REG_VOL_MUTE] =      TPA6130A2_MUTE_R |
                                    TPA6130A2_MUTE_L;

      if (data->power_gpio >= 0) {
            ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
            if (ret < 0) {
                  dev_err(dev, "Failed to request power GPIO (%d)\n",
                        data->power_gpio);
                  goto err_gpio;
            }
            gpio_direction_output(data->power_gpio, 0);
      }

      switch (data->id) {
      default:
            dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
                   pdata->id);
      case TPA6130A2:
            regulator = "Vdd";
            break;
      case TPA6140A2:
            regulator = "AVdd";
            break;
      }

      data->supply = regulator_get(dev, regulator);
      if (IS_ERR(data->supply)) {
            ret = PTR_ERR(data->supply);
            dev_err(dev, "Failed to request supply: %d\n", ret);
            goto err_regulator;
      }

      ret = tpa6130a2_power(1);
      if (ret != 0)
            goto err_power;


      /* Read version */
      ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
                         TPA6130A2_VERSION_MASK;
      if ((ret != 1) && (ret != 2))
            dev_warn(dev, "UNTESTED version detected (%d)\n", ret);

      /* Disable the chip */
      ret = tpa6130a2_power(0);
      if (ret != 0)
            goto err_power;

      return 0;

err_power:
      regulator_put(data->supply);
err_regulator:
      if (data->power_gpio >= 0)
            gpio_free(data->power_gpio);
err_gpio:
      kfree(data);
      i2c_set_clientdata(tpa6130a2_client, NULL);
      tpa6130a2_client = NULL;

      return ret;
}

static int __devexit tpa6130a2_remove(struct i2c_client *client)
{
      struct tpa6130a2_data *data = i2c_get_clientdata(client);

      tpa6130a2_power(0);

      if (data->power_gpio >= 0)
            gpio_free(data->power_gpio);

      regulator_put(data->supply);

      kfree(data);
      tpa6130a2_client = NULL;

      return 0;
}

static const struct i2c_device_id tpa6130a2_id[] = {
      { "tpa6130a2", 0 },
      { }
};
MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);

static struct i2c_driver tpa6130a2_i2c_driver = {
      .driver = {
            .name = "tpa6130a2",
            .owner = THIS_MODULE,
      },
      .probe = tpa6130a2_probe,
      .remove = __devexit_p(tpa6130a2_remove),
      .id_table = tpa6130a2_id,
};

static int __init tpa6130a2_init(void)
{
      return i2c_add_driver(&tpa6130a2_i2c_driver);
}

static void __exit tpa6130a2_exit(void)
{
      i2c_del_driver(&tpa6130a2_i2c_driver);
}

MODULE_AUTHOR("Peter Ujfalusi");
MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
MODULE_LICENSE("GPL");

module_init(tpa6130a2_init);
module_exit(tpa6130a2_exit);

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