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linux/sound/soc/codecs/tpa6130a2.c
Gustavo A. R. Silva 402954f8e5
ASoC: tpa6130a2: mark expected switch fall-through 
In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 115164
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2017-11-08 21:28:15 +00:00

343 lines
9.1 KiB
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/*
* ALSA SoC Texas Instruments TPA6130A2 headset stereo amplifier driver
*
* Copyright (C) Nokia Corporation
*
* Author: Peter Ujfalusi <peter.ujfalusi@ti.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 <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include "tpa6130a2.h"
enum tpa_model {
TPA6130A2,
TPA6140A2,
};
/* This struct is used to save the context */
struct tpa6130a2_data {
struct device *dev;
struct regmap *regmap;
struct regulator *supply;
int power_gpio;
enum tpa_model id;
};
static int tpa6130a2_power(struct tpa6130a2_data *data, bool enable)
{
int ret = 0, ret2;
if (enable) {
ret = regulator_enable(data->supply);
if (ret != 0) {
dev_err(data->dev,
"Failed to enable supply: %d\n", ret);
return ret;
}
/* Power on */
if (data->power_gpio >= 0)
gpio_set_value(data->power_gpio, 1);
/* Sync registers */
regcache_cache_only(data->regmap, false);
ret = regcache_sync(data->regmap);
if (ret != 0) {
dev_err(data->dev,
"Failed to sync registers: %d\n", ret);
regcache_cache_only(data->regmap, true);
if (data->power_gpio >= 0)
gpio_set_value(data->power_gpio, 0);
ret2 = regulator_disable(data->supply);
if (ret2 != 0)
dev_err(data->dev,
"Failed to disable supply: %d\n", ret2);
return ret;
}
} else {
/* Powered off device does not retain registers. While device
* is off, any register updates (i.e. volume changes) should
* happen in cache only.
*/
regcache_mark_dirty(data->regmap);
regcache_cache_only(data->regmap, true);
/* Power off */
if (data->power_gpio >= 0)
gpio_set_value(data->power_gpio, 0);
ret = regulator_disable(data->supply);
if (ret != 0) {
dev_err(data->dev,
"Failed to disable supply: %d\n", ret);
return ret;
}
}
return ret;
}
static int tpa6130a2_power_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kctrl, int event)
{
struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
struct tpa6130a2_data *data = snd_soc_component_get_drvdata(c);
if (SND_SOC_DAPM_EVENT_ON(event)) {
/* Before widget power up: turn chip on, sync registers */
return tpa6130a2_power(data, true);
} else {
/* After widget power down: turn chip off */
return tpa6130a2_power(data, false);
}
}
/*
* TPA6130 volume. From -59.5 to 4 dB with increasing step size when going
* down in gain.
*/
static const DECLARE_TLV_DB_RANGE(tpa6130_tlv,
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_TLV("Headphone Playback Volume",
TPA6130A2_REG_VOL_MUTE, 0, 0x3f, 0,
tpa6130_tlv),
};
static const DECLARE_TLV_DB_RANGE(tpa6140_tlv,
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_TLV("Headphone Playback Volume",
TPA6130A2_REG_VOL_MUTE, 1, 0x1f, 0,
tpa6140_tlv),
};
static int tpa6130a2_component_probe(struct snd_soc_component *component)
{
struct tpa6130a2_data *data = snd_soc_component_get_drvdata(component);
if (data->id == TPA6140A2)
return snd_soc_add_component_controls(component,
tpa6140a2_controls, ARRAY_SIZE(tpa6140a2_controls));
else
return snd_soc_add_component_controls(component,
tpa6130a2_controls, ARRAY_SIZE(tpa6130a2_controls));
}
static const struct snd_soc_dapm_widget tpa6130a2_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("LEFTIN"),
SND_SOC_DAPM_INPUT("RIGHTIN"),
SND_SOC_DAPM_OUTPUT("HPLEFT"),
SND_SOC_DAPM_OUTPUT("HPRIGHT"),
SND_SOC_DAPM_PGA("Left Mute", TPA6130A2_REG_VOL_MUTE,
TPA6130A2_HP_EN_L_SHIFT, 1, NULL, 0),
SND_SOC_DAPM_PGA("Right Mute", TPA6130A2_REG_VOL_MUTE,
TPA6130A2_HP_EN_R_SHIFT, 1, NULL, 0),
SND_SOC_DAPM_PGA("Left PGA", TPA6130A2_REG_CONTROL,
TPA6130A2_HP_EN_L_SHIFT, 0, NULL, 0),
SND_SOC_DAPM_PGA("Right PGA", TPA6130A2_REG_CONTROL,
TPA6130A2_HP_EN_R_SHIFT, 0, NULL, 0),
SND_SOC_DAPM_SUPPLY("Power", TPA6130A2_REG_CONTROL,
TPA6130A2_SWS_SHIFT, 1, tpa6130a2_power_event,
SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
};
static const struct snd_soc_dapm_route tpa6130a2_dapm_routes[] = {
{ "Left PGA", NULL, "LEFTIN" },
{ "Right PGA", NULL, "RIGHTIN" },
{ "Left Mute", NULL, "Left PGA" },
{ "Right Mute", NULL, "Right PGA" },
{ "HPLEFT", NULL, "Left Mute" },
{ "HPRIGHT", NULL, "Right Mute" },
{ "Left PGA", NULL, "Power" },
{ "Right PGA", NULL, "Power" },
};
static const struct snd_soc_component_driver tpa6130a2_component_driver = {
.name = "tpa6130a2",
.probe = tpa6130a2_component_probe,
.dapm_widgets = tpa6130a2_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(tpa6130a2_dapm_widgets),
.dapm_routes = tpa6130a2_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(tpa6130a2_dapm_routes),
};
static const struct reg_default tpa6130a2_reg_defaults[] = {
{ TPA6130A2_REG_CONTROL, TPA6130A2_SWS },
{ TPA6130A2_REG_VOL_MUTE, TPA6130A2_MUTE_R | TPA6130A2_MUTE_L },
};
static const struct regmap_config tpa6130a2_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TPA6130A2_REG_VERSION,
.reg_defaults = tpa6130a2_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(tpa6130a2_reg_defaults),
.cache_type = REGCACHE_RBTREE,
};
static int tpa6130a2_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev;
struct tpa6130a2_data *data;
struct tpa6130a2_platform_data *pdata = client->dev.platform_data;
struct device_node *np = client->dev.of_node;
const char *regulator;
unsigned int version;
int ret;
dev = &client->dev;
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->dev = dev;
data->regmap = devm_regmap_init_i2c(client, &tpa6130a2_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
if (pdata) {
data->power_gpio = pdata->power_gpio;
} else if (np) {
data->power_gpio = of_get_named_gpio(np, "power-gpio", 0);
} else {
dev_err(dev, "Platform data not set\n");
dump_stack();
return -ENODEV;
}
i2c_set_clientdata(client, data);
data->id = id->driver_data;
if (data->power_gpio >= 0) {
ret = devm_gpio_request(dev, data->power_gpio,
"tpa6130a2 enable");
if (ret < 0) {
dev_err(dev, "Failed to request power GPIO (%d)\n",
data->power_gpio);
return ret;
}
gpio_direction_output(data->power_gpio, 0);
}
switch (data->id) {
default:
dev_warn(dev, "Unknown TPA model (%d). Assuming 6130A2\n",
data->id);
/* fall through */
case TPA6130A2:
regulator = "Vdd";
break;
case TPA6140A2:
regulator = "AVdd";
break;
}
data->supply = devm_regulator_get(dev, regulator);
if (IS_ERR(data->supply)) {
ret = PTR_ERR(data->supply);
dev_err(dev, "Failed to request supply: %d\n", ret);
return ret;
}
ret = tpa6130a2_power(data, true);
if (ret != 0)
return ret;
/* Read version */
regmap_read(data->regmap, TPA6130A2_REG_VERSION, &version);
version &= TPA6130A2_VERSION_MASK;
if ((version != 1) && (version != 2))
dev_warn(dev, "UNTESTED version detected (%d)\n", version);
/* Disable the chip */
ret = tpa6130a2_power(data, false);
if (ret != 0)
return ret;
return devm_snd_soc_register_component(&client->dev,
&tpa6130a2_component_driver, NULL, 0);
}
static const struct i2c_device_id tpa6130a2_id[] = {
{ "tpa6130a2", TPA6130A2 },
{ "tpa6140a2", TPA6140A2 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tpa6130a2_id);
#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id tpa6130a2_of_match[] = {
{ .compatible = "ti,tpa6130a2", },
{ .compatible = "ti,tpa6140a2" },
{},
};
MODULE_DEVICE_TABLE(of, tpa6130a2_of_match);
#endif
static struct i2c_driver tpa6130a2_i2c_driver = {
.driver = {
.name = "tpa6130a2",
.of_match_table = of_match_ptr(tpa6130a2_of_match),
},
.probe = tpa6130a2_probe,
.id_table = tpa6130a2_id,
};
module_i2c_driver(tpa6130a2_i2c_driver);
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
MODULE_DESCRIPTION("TPA6130A2 Headphone amplifier driver");
MODULE_LICENSE("GPL");
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