503 lines
12 KiB
C
503 lines
12 KiB
C
/*
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* ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
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*
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* Copyright (C) Nokia Corporation
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*
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* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <sound/tpa6130a2-plat.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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#include "tpa6130a2.h"
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static struct i2c_client *tpa6130a2_client;
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/* This struct is used to save the context */
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struct tpa6130a2_data {
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struct mutex mutex;
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unsigned char regs[TPA6130A2_CACHEREGNUM];
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struct regulator *supply;
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int power_gpio;
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u8 power_state:1;
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enum tpa_model id;
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};
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static int tpa6130a2_i2c_read(int reg)
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{
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struct tpa6130a2_data *data;
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int val;
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BUG_ON(tpa6130a2_client == NULL);
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data = i2c_get_clientdata(tpa6130a2_client);
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/* If powered off, return the cached value */
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if (data->power_state) {
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val = i2c_smbus_read_byte_data(tpa6130a2_client, reg);
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if (val < 0)
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dev_err(&tpa6130a2_client->dev, "Read failed\n");
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else
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data->regs[reg] = val;
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} else {
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val = data->regs[reg];
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}
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return val;
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}
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static int tpa6130a2_i2c_write(int reg, u8 value)
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{
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struct tpa6130a2_data *data;
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int val = 0;
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BUG_ON(tpa6130a2_client == NULL);
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data = i2c_get_clientdata(tpa6130a2_client);
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if (data->power_state) {
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val = i2c_smbus_write_byte_data(tpa6130a2_client, reg, value);
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if (val < 0) {
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dev_err(&tpa6130a2_client->dev, "Write failed\n");
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return val;
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}
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}
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/* Either powered on or off, we save the context */
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data->regs[reg] = value;
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return val;
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}
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static u8 tpa6130a2_read(int reg)
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{
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struct tpa6130a2_data *data;
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BUG_ON(tpa6130a2_client == NULL);
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data = i2c_get_clientdata(tpa6130a2_client);
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return data->regs[reg];
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}
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static int tpa6130a2_initialize(void)
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{
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struct tpa6130a2_data *data;
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int i, ret = 0;
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BUG_ON(tpa6130a2_client == NULL);
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data = i2c_get_clientdata(tpa6130a2_client);
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for (i = 1; i < TPA6130A2_REG_VERSION; i++) {
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ret = tpa6130a2_i2c_write(i, data->regs[i]);
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if (ret < 0)
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break;
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}
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return ret;
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}
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static int tpa6130a2_power(u8 power)
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{
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struct tpa6130a2_data *data;
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u8 val;
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int ret = 0;
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BUG_ON(tpa6130a2_client == NULL);
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data = i2c_get_clientdata(tpa6130a2_client);
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mutex_lock(&data->mutex);
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if (power == data->power_state)
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goto exit;
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if (power) {
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ret = regulator_enable(data->supply);
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if (ret != 0) {
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dev_err(&tpa6130a2_client->dev,
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"Failed to enable supply: %d\n", ret);
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goto exit;
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}
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/* Power on */
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if (data->power_gpio >= 0)
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gpio_set_value(data->power_gpio, 1);
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data->power_state = 1;
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ret = tpa6130a2_initialize();
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if (ret < 0) {
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dev_err(&tpa6130a2_client->dev,
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"Failed to initialize chip\n");
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if (data->power_gpio >= 0)
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gpio_set_value(data->power_gpio, 0);
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regulator_disable(data->supply);
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data->power_state = 0;
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goto exit;
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}
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} else {
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/* set SWS */
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val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
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val |= TPA6130A2_SWS;
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tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
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/* Power off */
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if (data->power_gpio >= 0)
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gpio_set_value(data->power_gpio, 0);
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ret = regulator_disable(data->supply);
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if (ret != 0) {
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dev_err(&tpa6130a2_client->dev,
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"Failed to disable supply: %d\n", ret);
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goto exit;
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}
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data->power_state = 0;
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}
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exit:
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mutex_unlock(&data->mutex);
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return ret;
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}
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static int tpa6130a2_get_volsw(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct soc_mixer_control *mc =
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(struct soc_mixer_control *)kcontrol->private_value;
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struct tpa6130a2_data *data;
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unsigned int reg = mc->reg;
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unsigned int shift = mc->shift;
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int max = mc->max;
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unsigned int mask = (1 << fls(max)) - 1;
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unsigned int invert = mc->invert;
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BUG_ON(tpa6130a2_client == NULL);
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data = i2c_get_clientdata(tpa6130a2_client);
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mutex_lock(&data->mutex);
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ucontrol->value.integer.value[0] =
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(tpa6130a2_read(reg) >> shift) & mask;
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if (invert)
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ucontrol->value.integer.value[0] =
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max - ucontrol->value.integer.value[0];
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mutex_unlock(&data->mutex);
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return 0;
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}
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static int tpa6130a2_put_volsw(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct soc_mixer_control *mc =
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(struct soc_mixer_control *)kcontrol->private_value;
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struct tpa6130a2_data *data;
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unsigned int reg = mc->reg;
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unsigned int shift = mc->shift;
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int max = mc->max;
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unsigned int mask = (1 << fls(max)) - 1;
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unsigned int invert = mc->invert;
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unsigned int val = (ucontrol->value.integer.value[0] & mask);
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unsigned int val_reg;
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BUG_ON(tpa6130a2_client == NULL);
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data = i2c_get_clientdata(tpa6130a2_client);
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if (invert)
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val = max - val;
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mutex_lock(&data->mutex);
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val_reg = tpa6130a2_read(reg);
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if (((val_reg >> shift) & mask) == val) {
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mutex_unlock(&data->mutex);
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return 0;
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}
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val_reg &= ~(mask << shift);
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val_reg |= val << shift;
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tpa6130a2_i2c_write(reg, val_reg);
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mutex_unlock(&data->mutex);
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return 1;
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}
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/*
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* TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
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* down in gain.
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*/
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static const unsigned int tpa6130_tlv[] = {
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TLV_DB_RANGE_HEAD(10),
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0, 1, TLV_DB_SCALE_ITEM(-5950, 600, 0),
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2, 3, TLV_DB_SCALE_ITEM(-5000, 250, 0),
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4, 5, TLV_DB_SCALE_ITEM(-4550, 160, 0),
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6, 7, TLV_DB_SCALE_ITEM(-4140, 190, 0),
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8, 9, TLV_DB_SCALE_ITEM(-3650, 120, 0),
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10, 11, TLV_DB_SCALE_ITEM(-3330, 160, 0),
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12, 13, TLV_DB_SCALE_ITEM(-3040, 180, 0),
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14, 20, TLV_DB_SCALE_ITEM(-2710, 110, 0),
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21, 37, TLV_DB_SCALE_ITEM(-1960, 74, 0),
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38, 63, TLV_DB_SCALE_ITEM(-720, 45, 0),
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};
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static const struct snd_kcontrol_new tpa6130a2_controls[] = {
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SOC_SINGLE_EXT_TLV("TPA6130A2 Headphone Playback Volume",
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TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
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tpa6130a2_get_volsw, tpa6130a2_put_volsw,
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tpa6130_tlv),
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};
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static const unsigned int tpa6140_tlv[] = {
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TLV_DB_RANGE_HEAD(3),
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0, 8, TLV_DB_SCALE_ITEM(-5900, 400, 0),
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9, 16, TLV_DB_SCALE_ITEM(-2500, 200, 0),
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17, 31, TLV_DB_SCALE_ITEM(-1000, 100, 0),
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};
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static const struct snd_kcontrol_new tpa6140a2_controls[] = {
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SOC_SINGLE_EXT_TLV("TPA6140A2 Headphone Playback Volume",
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TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
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tpa6130a2_get_volsw, tpa6130a2_put_volsw,
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tpa6140_tlv),
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};
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/*
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* Enable or disable channel (left or right)
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* The bit number for mute and amplifier are the same per channel:
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* bit 6: Right channel
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* bit 7: Left channel
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* in both registers.
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*/
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static void tpa6130a2_channel_enable(u8 channel, int enable)
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{
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u8 val;
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if (enable) {
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/* Enable channel */
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/* Enable amplifier */
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val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
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val |= channel;
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val &= ~TPA6130A2_SWS;
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tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
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/* Unmute channel */
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val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
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val &= ~channel;
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tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
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} else {
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/* Disable channel */
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/* Mute channel */
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val = tpa6130a2_read(TPA6130A2_REG_VOL_MUTE);
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val |= channel;
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tpa6130a2_i2c_write(TPA6130A2_REG_VOL_MUTE, val);
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/* Disable amplifier */
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val = tpa6130a2_read(TPA6130A2_REG_CONTROL);
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val &= ~channel;
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tpa6130a2_i2c_write(TPA6130A2_REG_CONTROL, val);
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}
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}
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int tpa6130a2_stereo_enable(struct snd_soc_codec *codec, int enable)
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{
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int ret = 0;
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if (enable) {
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ret = tpa6130a2_power(1);
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if (ret < 0)
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return ret;
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tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
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1);
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} else {
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tpa6130a2_channel_enable(TPA6130A2_HP_EN_R | TPA6130A2_HP_EN_L,
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0);
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ret = tpa6130a2_power(0);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(tpa6130a2_stereo_enable);
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int tpa6130a2_add_controls(struct snd_soc_codec *codec)
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{
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struct tpa6130a2_data *data;
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if (tpa6130a2_client == NULL)
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return -ENODEV;
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data = i2c_get_clientdata(tpa6130a2_client);
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if (data->id == TPA6140A2)
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return snd_soc_add_controls(codec, tpa6140a2_controls,
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ARRAY_SIZE(tpa6140a2_controls));
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else
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return snd_soc_add_controls(codec, tpa6130a2_controls,
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ARRAY_SIZE(tpa6130a2_controls));
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}
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EXPORT_SYMBOL_GPL(tpa6130a2_add_controls);
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static int __devinit tpa6130a2_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev;
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struct tpa6130a2_data *data;
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struct tpa6130a2_platform_data *pdata;
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const char *regulator;
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int ret;
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dev = &client->dev;
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if (client->dev.platform_data == NULL) {
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dev_err(dev, "Platform data not set\n");
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dump_stack();
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return -ENODEV;
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}
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL) {
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dev_err(dev, "Can not allocate memory\n");
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return -ENOMEM;
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}
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tpa6130a2_client = client;
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i2c_set_clientdata(tpa6130a2_client, data);
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pdata = client->dev.platform_data;
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data->power_gpio = pdata->power_gpio;
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data->id = pdata->id;
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mutex_init(&data->mutex);
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/* Set default register values */
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data->regs[TPA6130A2_REG_CONTROL] = TPA6130A2_SWS;
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data->regs[TPA6130A2_REG_VOL_MUTE] = TPA6130A2_MUTE_R |
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TPA6130A2_MUTE_L;
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if (data->power_gpio >= 0) {
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ret = gpio_request(data->power_gpio, "tpa6130a2 enable");
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if (ret < 0) {
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dev_err(dev, "Failed to request power GPIO (%d)\n",
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data->power_gpio);
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goto err_gpio;
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}
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gpio_direction_output(data->power_gpio, 0);
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}
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switch (data->id) {
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default:
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dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
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pdata->id);
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case TPA6130A2:
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regulator = "Vdd";
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break;
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case TPA6140A2:
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regulator = "AVdd";
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break;
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}
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data->supply = regulator_get(dev, regulator);
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if (IS_ERR(data->supply)) {
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ret = PTR_ERR(data->supply);
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dev_err(dev, "Failed to request supply: %d\n", ret);
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goto err_regulator;
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}
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ret = tpa6130a2_power(1);
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if (ret != 0)
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goto err_power;
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/* Read version */
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ret = tpa6130a2_i2c_read(TPA6130A2_REG_VERSION) &
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TPA6130A2_VERSION_MASK;
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if ((ret != 1) && (ret != 2))
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dev_warn(dev, "UNTESTED version detected (%d)\n", ret);
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/* Disable the chip */
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ret = tpa6130a2_power(0);
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if (ret != 0)
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goto err_power;
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return 0;
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err_power:
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regulator_put(data->supply);
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err_regulator:
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if (data->power_gpio >= 0)
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gpio_free(data->power_gpio);
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err_gpio:
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kfree(data);
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tpa6130a2_client = NULL;
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return ret;
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}
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static int __devexit tpa6130a2_remove(struct i2c_client *client)
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{
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struct tpa6130a2_data *data = i2c_get_clientdata(client);
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tpa6130a2_power(0);
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if (data->power_gpio >= 0)
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gpio_free(data->power_gpio);
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regulator_put(data->supply);
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kfree(data);
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tpa6130a2_client = NULL;
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return 0;
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}
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static const struct i2c_device_id tpa6130a2_id[] = {
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{ "tpa6130a2", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
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static struct i2c_driver tpa6130a2_i2c_driver = {
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.driver = {
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.name = "tpa6130a2",
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.owner = THIS_MODULE,
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},
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.probe = tpa6130a2_probe,
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.remove = __devexit_p(tpa6130a2_remove),
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.id_table = tpa6130a2_id,
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};
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static int __init tpa6130a2_init(void)
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{
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return i2c_add_driver(&tpa6130a2_i2c_driver);
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}
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static void __exit tpa6130a2_exit(void)
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{
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i2c_del_driver(&tpa6130a2_i2c_driver);
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}
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MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
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MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
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MODULE_LICENSE("GPL");
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module_init(tpa6130a2_init);
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module_exit(tpa6130a2_exit);
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