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linux/sound/soc/codecs/tas6424.c
Uwe Kleine-König ed5c2f5fd1 i2c: Make remove callback return void 
The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Crt Mori <cmo@melexis.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5
Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b
Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-16 12:46:26 +02:00

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// SPDX-License-Identifier: GPL-2.0
/*
* ALSA SoC Texas Instruments TAS6424 Quad-Channel Audio Amplifier
*
* Copyright (C) 2016-2017 Texas Instruments Incorporated - https://www.ti.com/
* Author: Andreas Dannenberg <dannenberg@ti.com>
* Andrew F. Davis <afd@ti.com>
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/regulator/consumer.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/tlv.h>
#include "tas6424.h"
/* Define how often to check (and clear) the fault status register (in ms) */
#define TAS6424_FAULT_CHECK_INTERVAL 200
static const char * const tas6424_supply_names[] = {
"dvdd", /* Digital power supply. Connect to 3.3-V supply. */
"vbat", /* Supply used for higher voltage analog circuits. */
"pvdd", /* Class-D amp output FETs supply. */
};
#define TAS6424_NUM_SUPPLIES ARRAY_SIZE(tas6424_supply_names)
struct tas6424_data {
struct device *dev;
struct regmap *regmap;
struct regulator_bulk_data supplies[TAS6424_NUM_SUPPLIES];
struct delayed_work fault_check_work;
unsigned int last_cfault;
unsigned int last_fault1;
unsigned int last_fault2;
unsigned int last_warn;
struct gpio_desc *standby_gpio;
struct gpio_desc *mute_gpio;
};
/*
* DAC digital volumes. From -103.5 to 24 dB in 0.5 dB steps. Note that
* setting the gain below -100 dB (register value <0x7) is effectively a MUTE
* as per device datasheet.
*/
static DECLARE_TLV_DB_SCALE(dac_tlv, -10350, 50, 0);
static const struct snd_kcontrol_new tas6424_snd_controls[] = {
SOC_SINGLE_TLV("Speaker Driver CH1 Playback Volume",
TAS6424_CH1_VOL_CTRL, 0, 0xff, 0, dac_tlv),
SOC_SINGLE_TLV("Speaker Driver CH2 Playback Volume",
TAS6424_CH2_VOL_CTRL, 0, 0xff, 0, dac_tlv),
SOC_SINGLE_TLV("Speaker Driver CH3 Playback Volume",
TAS6424_CH3_VOL_CTRL, 0, 0xff, 0, dac_tlv),
SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",
TAS6424_CH4_VOL_CTRL, 0, 0xff, 0, dac_tlv),
SOC_SINGLE_STROBE("Auto Diagnostics Switch", TAS6424_DC_DIAG_CTRL1,
TAS6424_LDGBYPASS_SHIFT, 1),
};
static int tas6424_dac_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
dev_dbg(component->dev, "%s() event=0x%0x\n", __func__, event);
if (event & SND_SOC_DAPM_POST_PMU) {
/* Observe codec shutdown-to-active time */
msleep(12);
/* Turn on TAS6424 periodic fault checking/handling */
tas6424->last_fault1 = 0;
tas6424->last_fault2 = 0;
tas6424->last_warn = 0;
schedule_delayed_work(&tas6424->fault_check_work,
msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
} else if (event & SND_SOC_DAPM_PRE_PMD) {
/* Disable TAS6424 periodic fault checking/handling */
cancel_delayed_work_sync(&tas6424->fault_check_work);
}
return 0;
}
static const struct snd_soc_dapm_widget tas6424_dapm_widgets[] = {
SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas6424_dac_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
SND_SOC_DAPM_OUTPUT("OUT")
};
static const struct snd_soc_dapm_route tas6424_audio_map[] = {
{ "DAC", NULL, "DAC IN" },
{ "OUT", NULL, "DAC" },
};
static int tas6424_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
unsigned int rate = params_rate(params);
unsigned int width = params_width(params);
u8 sap_ctrl = 0;
dev_dbg(component->dev, "%s() rate=%u width=%u\n", __func__, rate, width);
switch (rate) {
case 44100:
sap_ctrl |= TAS6424_SAP_RATE_44100;
break;
case 48000:
sap_ctrl |= TAS6424_SAP_RATE_48000;
break;
case 96000:
sap_ctrl |= TAS6424_SAP_RATE_96000;
break;
default:
dev_err(component->dev, "unsupported sample rate: %u\n", rate);
return -EINVAL;
}
switch (width) {
case 16:
sap_ctrl |= TAS6424_SAP_TDM_SLOT_SZ_16;
break;
case 24:
break;
default:
dev_err(component->dev, "unsupported sample width: %u\n", width);
return -EINVAL;
}
snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
TAS6424_SAP_RATE_MASK |
TAS6424_SAP_TDM_SLOT_SZ_16,
sap_ctrl);
return 0;
}
static int tas6424_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct snd_soc_component *component = dai->component;
u8 serial_format = 0;
dev_dbg(component->dev, "%s() fmt=0x%0x\n", __func__, fmt);
/* clock masters */
switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
case SND_SOC_DAIFMT_CBC_CFC:
break;
default:
dev_err(component->dev, "Invalid DAI clocking\n");
return -EINVAL;
}
/* signal polarity */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
default:
dev_err(component->dev, "Invalid DAI clock signal polarity\n");
return -EINVAL;
}
/* interface format */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
serial_format |= TAS6424_SAP_I2S;
break;
case SND_SOC_DAIFMT_DSP_A:
serial_format |= TAS6424_SAP_DSP;
break;
case SND_SOC_DAIFMT_DSP_B:
/*
* We can use the fact that the TAS6424 does not care about the
* LRCLK duty cycle during TDM to receive DSP_B formatted data
* in LEFTJ mode (no delaying of the 1st data bit).
*/
serial_format |= TAS6424_SAP_LEFTJ;
break;
case SND_SOC_DAIFMT_LEFT_J:
serial_format |= TAS6424_SAP_LEFTJ;
break;
default:
dev_err(component->dev, "Invalid DAI interface format\n");
return -EINVAL;
}
snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
TAS6424_SAP_FMT_MASK, serial_format);
return 0;
}
static int tas6424_set_dai_tdm_slot(struct snd_soc_dai *dai,
unsigned int tx_mask, unsigned int rx_mask,
int slots, int slot_width)
{
struct snd_soc_component *component = dai->component;
unsigned int first_slot, last_slot;
bool sap_tdm_slot_last;
dev_dbg(component->dev, "%s() tx_mask=%d rx_mask=%d\n", __func__,
tx_mask, rx_mask);
if (!tx_mask || !rx_mask)
return 0; /* nothing needed to disable TDM mode */
/*
* Determine the first slot and last slot that is being requested so
* we'll be able to more easily enforce certain constraints as the
* TAS6424's TDM interface is not fully configurable.
*/
first_slot = __ffs(tx_mask);
last_slot = __fls(rx_mask);
if (last_slot - first_slot != 4) {
dev_err(component->dev, "tdm mask must cover 4 contiguous slots\n");
return -EINVAL;
}
switch (first_slot) {
case 0:
sap_tdm_slot_last = false;
break;
case 4:
sap_tdm_slot_last = true;
break;
default:
dev_err(component->dev, "tdm mask must start at slot 0 or 4\n");
return -EINVAL;
}
snd_soc_component_update_bits(component, TAS6424_SAP_CTRL, TAS6424_SAP_TDM_SLOT_LAST,
sap_tdm_slot_last ? TAS6424_SAP_TDM_SLOT_LAST : 0);
return 0;
}
static int tas6424_mute(struct snd_soc_dai *dai, int mute, int direction)
{
struct snd_soc_component *component = dai->component;
struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
unsigned int val;
dev_dbg(component->dev, "%s() mute=%d\n", __func__, mute);
if (tas6424->mute_gpio) {
gpiod_set_value_cansleep(tas6424->mute_gpio, mute);
return 0;
}
if (mute)
val = TAS6424_ALL_STATE_MUTE;
else
val = TAS6424_ALL_STATE_PLAY;
snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, val);
return 0;
}
static int tas6424_power_off(struct snd_soc_component *component)
{
struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
int ret;
snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_HIZ);
regcache_cache_only(tas6424->regmap, true);
regcache_mark_dirty(tas6424->regmap);
ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
tas6424->supplies);
if (ret < 0) {
dev_err(component->dev, "failed to disable supplies: %d\n", ret);
return ret;
}
return 0;
}
static int tas6424_power_on(struct snd_soc_component *component)
{
struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
int ret;
u8 chan_states;
int no_auto_diags = 0;
unsigned int reg_val;
if (!regmap_read(tas6424->regmap, TAS6424_DC_DIAG_CTRL1, &reg_val))
no_auto_diags = reg_val & TAS6424_LDGBYPASS_MASK;
ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
tas6424->supplies);
if (ret < 0) {
dev_err(component->dev, "failed to enable supplies: %d\n", ret);
return ret;
}
regcache_cache_only(tas6424->regmap, false);
ret = regcache_sync(tas6424->regmap);
if (ret < 0) {
dev_err(component->dev, "failed to sync regcache: %d\n", ret);
return ret;
}
if (tas6424->mute_gpio) {
gpiod_set_value_cansleep(tas6424->mute_gpio, 0);
/*
* channels are muted via the mute pin. Don't also mute
* them via the registers so that subsequent register
* access is not necessary to un-mute the channels
*/
chan_states = TAS6424_ALL_STATE_PLAY;
} else {
chan_states = TAS6424_ALL_STATE_MUTE;
}
snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, chan_states);
/* any time we come out of HIZ, the output channels automatically run DC
* load diagnostics if autodiagnotics are enabled. wait here until this
* completes.
*/
if (!no_auto_diags)
msleep(230);
return 0;
}
static int tas6424_set_bias_level(struct snd_soc_component *component,
enum snd_soc_bias_level level)
{
dev_dbg(component->dev, "%s() level=%d\n", __func__, level);
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF)
tas6424_power_on(component);
break;
case SND_SOC_BIAS_OFF:
tas6424_power_off(component);
break;
}
return 0;
}
static struct snd_soc_component_driver soc_codec_dev_tas6424 = {
.set_bias_level = tas6424_set_bias_level,
.controls = tas6424_snd_controls,
.num_controls = ARRAY_SIZE(tas6424_snd_controls),
.dapm_widgets = tas6424_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(tas6424_dapm_widgets),
.dapm_routes = tas6424_audio_map,
.num_dapm_routes = ARRAY_SIZE(tas6424_audio_map),
.use_pmdown_time = 1,
.endianness = 1,
};
static const struct snd_soc_dai_ops tas6424_speaker_dai_ops = {
.hw_params = tas6424_hw_params,
.set_fmt = tas6424_set_dai_fmt,
.set_tdm_slot = tas6424_set_dai_tdm_slot,
.mute_stream = tas6424_mute,
.no_capture_mute = 1,
};
static struct snd_soc_dai_driver tas6424_dai[] = {
{
.name = "tas6424-amplifier",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 4,
.rates = TAS6424_RATES,
.formats = TAS6424_FORMATS,
},
.ops = &tas6424_speaker_dai_ops,
},
};
static void tas6424_fault_check_work(struct work_struct *work)
{
struct tas6424_data *tas6424 = container_of(work, struct tas6424_data,
fault_check_work.work);
struct device *dev = tas6424->dev;
unsigned int reg;
int ret;
ret = regmap_read(tas6424->regmap, TAS6424_CHANNEL_FAULT, &reg);
if (ret < 0) {
dev_err(dev, "failed to read CHANNEL_FAULT register: %d\n", ret);
goto out;
}
if (!reg) {
tas6424->last_cfault = reg;
goto check_global_fault1_reg;
}
/*
* Only flag errors once for a given occurrence. This is needed as
* the TAS6424 will take time clearing the fault condition internally
* during which we don't want to bombard the system with the same
* error message over and over.
*/
if ((reg & TAS6424_FAULT_OC_CH1) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH1))
dev_crit(dev, "experienced a channel 1 overcurrent fault\n");
if ((reg & TAS6424_FAULT_OC_CH2) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH2))
dev_crit(dev, "experienced a channel 2 overcurrent fault\n");
if ((reg & TAS6424_FAULT_OC_CH3) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH3))
dev_crit(dev, "experienced a channel 3 overcurrent fault\n");
if ((reg & TAS6424_FAULT_OC_CH4) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH4))
dev_crit(dev, "experienced a channel 4 overcurrent fault\n");
if ((reg & TAS6424_FAULT_DC_CH1) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH1))
dev_crit(dev, "experienced a channel 1 DC fault\n");
if ((reg & TAS6424_FAULT_DC_CH2) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH2))
dev_crit(dev, "experienced a channel 2 DC fault\n");
if ((reg & TAS6424_FAULT_DC_CH3) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH3))
dev_crit(dev, "experienced a channel 3 DC fault\n");
if ((reg & TAS6424_FAULT_DC_CH4) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH4))
dev_crit(dev, "experienced a channel 4 DC fault\n");
/* Store current fault1 value so we can detect any changes next time */
tas6424->last_cfault = reg;
check_global_fault1_reg:
ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT1, &reg);
if (ret < 0) {
dev_err(dev, "failed to read GLOB_FAULT1 register: %d\n", ret);
goto out;
}
/*
* Ignore any clock faults as there is no clean way to check for them.
* We would need to start checking for those faults *after* the SAIF
* stream has been setup, and stop checking *before* the stream is
* stopped to avoid any false-positives. However there are no
* appropriate hooks to monitor these events.
*/
reg &= TAS6424_FAULT_PVDD_OV |
TAS6424_FAULT_VBAT_OV |
TAS6424_FAULT_PVDD_UV |
TAS6424_FAULT_VBAT_UV;
if (!reg) {
tas6424->last_fault1 = reg;
goto check_global_fault2_reg;
}
if ((reg & TAS6424_FAULT_PVDD_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_OV))
dev_crit(dev, "experienced a PVDD overvoltage fault\n");
if ((reg & TAS6424_FAULT_VBAT_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_OV))
dev_crit(dev, "experienced a VBAT overvoltage fault\n");
if ((reg & TAS6424_FAULT_PVDD_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_UV))
dev_crit(dev, "experienced a PVDD undervoltage fault\n");
if ((reg & TAS6424_FAULT_VBAT_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_UV))
dev_crit(dev, "experienced a VBAT undervoltage fault\n");
/* Store current fault1 value so we can detect any changes next time */
tas6424->last_fault1 = reg;
check_global_fault2_reg:
ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT2, &reg);
if (ret < 0) {
dev_err(dev, "failed to read GLOB_FAULT2 register: %d\n", ret);
goto out;
}
reg &= TAS6424_FAULT_OTSD |
TAS6424_FAULT_OTSD_CH1 |
TAS6424_FAULT_OTSD_CH2 |
TAS6424_FAULT_OTSD_CH3 |
TAS6424_FAULT_OTSD_CH4;
if (!reg) {
tas6424->last_fault2 = reg;
goto check_warn_reg;
}
if ((reg & TAS6424_FAULT_OTSD) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD))
dev_crit(dev, "experienced a global overtemp shutdown\n");
if ((reg & TAS6424_FAULT_OTSD_CH1) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH1))
dev_crit(dev, "experienced an overtemp shutdown on CH1\n");
if ((reg & TAS6424_FAULT_OTSD_CH2) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH2))
dev_crit(dev, "experienced an overtemp shutdown on CH2\n");
if ((reg & TAS6424_FAULT_OTSD_CH3) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH3))
dev_crit(dev, "experienced an overtemp shutdown on CH3\n");
if ((reg & TAS6424_FAULT_OTSD_CH4) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH4))
dev_crit(dev, "experienced an overtemp shutdown on CH4\n");
/* Store current fault2 value so we can detect any changes next time */
tas6424->last_fault2 = reg;
check_warn_reg:
ret = regmap_read(tas6424->regmap, TAS6424_WARN, &reg);
if (ret < 0) {
dev_err(dev, "failed to read WARN register: %d\n", ret);
goto out;
}
reg &= TAS6424_WARN_VDD_UV |
TAS6424_WARN_VDD_POR |
TAS6424_WARN_VDD_OTW |
TAS6424_WARN_VDD_OTW_CH1 |
TAS6424_WARN_VDD_OTW_CH2 |
TAS6424_WARN_VDD_OTW_CH3 |
TAS6424_WARN_VDD_OTW_CH4;
if (!reg) {
tas6424->last_warn = reg;
goto out;
}
if ((reg & TAS6424_WARN_VDD_UV) && !(tas6424->last_warn & TAS6424_WARN_VDD_UV))
dev_warn(dev, "experienced a VDD under voltage condition\n");
if ((reg & TAS6424_WARN_VDD_POR) && !(tas6424->last_warn & TAS6424_WARN_VDD_POR))
dev_warn(dev, "experienced a VDD POR condition\n");
if ((reg & TAS6424_WARN_VDD_OTW) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW))
dev_warn(dev, "experienced a global overtemp warning\n");
if ((reg & TAS6424_WARN_VDD_OTW_CH1) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH1))
dev_warn(dev, "experienced an overtemp warning on CH1\n");
if ((reg & TAS6424_WARN_VDD_OTW_CH2) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH2))
dev_warn(dev, "experienced an overtemp warning on CH2\n");
if ((reg & TAS6424_WARN_VDD_OTW_CH3) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH3))
dev_warn(dev, "experienced an overtemp warning on CH3\n");
if ((reg & TAS6424_WARN_VDD_OTW_CH4) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH4))
dev_warn(dev, "experienced an overtemp warning on CH4\n");
/* Store current warn value so we can detect any changes next time */
tas6424->last_warn = reg;
/* Clear any warnings by toggling the CLEAR_FAULT control bit */
ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
TAS6424_CLEAR_FAULT, TAS6424_CLEAR_FAULT);
if (ret < 0)
dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
TAS6424_CLEAR_FAULT, 0);
if (ret < 0)
dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
out:
/* Schedule the next fault check at the specified interval */
schedule_delayed_work(&tas6424->fault_check_work,
msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
}
static const struct reg_default tas6424_reg_defaults[] = {
{ TAS6424_MODE_CTRL, 0x00 },
{ TAS6424_MISC_CTRL1, 0x32 },
{ TAS6424_MISC_CTRL2, 0x62 },
{ TAS6424_SAP_CTRL, 0x04 },
{ TAS6424_CH_STATE_CTRL, 0x55 },
{ TAS6424_CH1_VOL_CTRL, 0xcf },
{ TAS6424_CH2_VOL_CTRL, 0xcf },
{ TAS6424_CH3_VOL_CTRL, 0xcf },
{ TAS6424_CH4_VOL_CTRL, 0xcf },
{ TAS6424_DC_DIAG_CTRL1, 0x00 },
{ TAS6424_DC_DIAG_CTRL2, 0x11 },
{ TAS6424_DC_DIAG_CTRL3, 0x11 },
{ TAS6424_PIN_CTRL, 0xff },
{ TAS6424_AC_DIAG_CTRL1, 0x00 },
{ TAS6424_MISC_CTRL3, 0x00 },
{ TAS6424_CLIP_CTRL, 0x01 },
{ TAS6424_CLIP_WINDOW, 0x14 },
{ TAS6424_CLIP_WARN, 0x00 },
{ TAS6424_CBC_STAT, 0x00 },
{ TAS6424_MISC_CTRL4, 0x40 },
};
static bool tas6424_is_writable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TAS6424_MODE_CTRL:
case TAS6424_MISC_CTRL1:
case TAS6424_MISC_CTRL2:
case TAS6424_SAP_CTRL:
case TAS6424_CH_STATE_CTRL:
case TAS6424_CH1_VOL_CTRL:
case TAS6424_CH2_VOL_CTRL:
case TAS6424_CH3_VOL_CTRL:
case TAS6424_CH4_VOL_CTRL:
case TAS6424_DC_DIAG_CTRL1:
case TAS6424_DC_DIAG_CTRL2:
case TAS6424_DC_DIAG_CTRL3:
case TAS6424_PIN_CTRL:
case TAS6424_AC_DIAG_CTRL1:
case TAS6424_MISC_CTRL3:
case TAS6424_CLIP_CTRL:
case TAS6424_CLIP_WINDOW:
case TAS6424_CLIP_WARN:
case TAS6424_CBC_STAT:
case TAS6424_MISC_CTRL4:
return true;
default:
return false;
}
}
static bool tas6424_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TAS6424_DC_LOAD_DIAG_REP12:
case TAS6424_DC_LOAD_DIAG_REP34:
case TAS6424_DC_LOAD_DIAG_REPLO:
case TAS6424_CHANNEL_STATE:
case TAS6424_CHANNEL_FAULT:
case TAS6424_GLOB_FAULT1:
case TAS6424_GLOB_FAULT2:
case TAS6424_WARN:
case TAS6424_AC_LOAD_DIAG_REP1:
case TAS6424_AC_LOAD_DIAG_REP2:
case TAS6424_AC_LOAD_DIAG_REP3:
case TAS6424_AC_LOAD_DIAG_REP4:
return true;
default:
return false;
}
}
static const struct regmap_config tas6424_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.writeable_reg = tas6424_is_writable_reg,
.volatile_reg = tas6424_is_volatile_reg,
.max_register = TAS6424_MAX,
.reg_defaults = tas6424_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(tas6424_reg_defaults),
.cache_type = REGCACHE_RBTREE,
};
#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id tas6424_of_ids[] = {
{ .compatible = "ti,tas6424", },
{ },
};
MODULE_DEVICE_TABLE(of, tas6424_of_ids);
#endif
static int tas6424_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct tas6424_data *tas6424;
int ret;
int i;
tas6424 = devm_kzalloc(dev, sizeof(*tas6424), GFP_KERNEL);
if (!tas6424)
return -ENOMEM;
dev_set_drvdata(dev, tas6424);
tas6424->dev = dev;
tas6424->regmap = devm_regmap_init_i2c(client, &tas6424_regmap_config);
if (IS_ERR(tas6424->regmap)) {
ret = PTR_ERR(tas6424->regmap);
dev_err(dev, "unable to allocate register map: %d\n", ret);
return ret;
}
/*
* Get control of the standby pin and set it LOW to take the codec
* out of the stand-by mode.
* Note: The actual pin polarity is taken care of in the GPIO lib
* according the polarity specified in the DTS.
*/
tas6424->standby_gpio = devm_gpiod_get_optional(dev, "standby",
GPIOD_OUT_LOW);
if (IS_ERR(tas6424->standby_gpio)) {
if (PTR_ERR(tas6424->standby_gpio) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_info(dev, "failed to get standby GPIO: %ld\n",
PTR_ERR(tas6424->standby_gpio));
tas6424->standby_gpio = NULL;
}
/*
* Get control of the mute pin and set it HIGH in order to start with
* all the output muted.
* Note: The actual pin polarity is taken care of in the GPIO lib
* according the polarity specified in the DTS.
*/
tas6424->mute_gpio = devm_gpiod_get_optional(dev, "mute",
GPIOD_OUT_HIGH);
if (IS_ERR(tas6424->mute_gpio)) {
if (PTR_ERR(tas6424->mute_gpio) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_info(dev, "failed to get nmute GPIO: %ld\n",
PTR_ERR(tas6424->mute_gpio));
tas6424->mute_gpio = NULL;
}
for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)
tas6424->supplies[i].supply = tas6424_supply_names[i];
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),
tas6424->supplies);
if (ret) {
dev_err(dev, "unable to request supplies: %d\n", ret);
return ret;
}
ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
tas6424->supplies);
if (ret) {
dev_err(dev, "unable to enable supplies: %d\n", ret);
return ret;
}
/* Reset device to establish well-defined startup state */
ret = regmap_update_bits(tas6424->regmap, TAS6424_MODE_CTRL,
TAS6424_RESET, TAS6424_RESET);
if (ret) {
dev_err(dev, "unable to reset device: %d\n", ret);
goto disable_regs;
}
INIT_DELAYED_WORK(&tas6424->fault_check_work, tas6424_fault_check_work);
ret = devm_snd_soc_register_component(dev, &soc_codec_dev_tas6424,
tas6424_dai, ARRAY_SIZE(tas6424_dai));
if (ret < 0) {
dev_err(dev, "unable to register codec: %d\n", ret);
goto disable_regs;
}
return 0;
disable_regs:
regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies), tas6424->supplies);
return ret;
}
static void tas6424_i2c_remove(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct tas6424_data *tas6424 = dev_get_drvdata(dev);
int ret;
cancel_delayed_work_sync(&tas6424->fault_check_work);
/* put the codec in stand-by */
if (tas6424->standby_gpio)
gpiod_set_value_cansleep(tas6424->standby_gpio, 1);
ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
tas6424->supplies);
if (ret < 0)
dev_err(dev, "unable to disable supplies: %d\n", ret);
}
static const struct i2c_device_id tas6424_i2c_ids[] = {
{ "tas6424", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tas6424_i2c_ids);
static struct i2c_driver tas6424_i2c_driver = {
.driver = {
.name = "tas6424",
.of_match_table = of_match_ptr(tas6424_of_ids),
},
.probe_new = tas6424_i2c_probe,
.remove = tas6424_i2c_remove,
.id_table = tas6424_i2c_ids,
};
module_i2c_driver(tas6424_i2c_driver);
MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("TAS6424 Audio amplifier driver");
MODULE_LICENSE("GPL v2");
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