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// SPDX-License-Identifier: GPL-2.0
// Audio driver for PCM1789
// Copyright (C) 2018 Bootlin
// Mylène Josserand <mylene.josserand@bootlin.com>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include "pcm1789.h"
#define PCM1789_MUTE_CONTROL 0x10
#define PCM1789_FMT_CONTROL 0x11
#define PCM1789_SOFT_MUTE 0x14
#define PCM1789_DAC_VOL_LEFT 0x18
#define PCM1789_DAC_VOL_RIGHT 0x19
#define PCM1789_FMT_MASK 0x07
#define PCM1789_MUTE_MASK 0x03
#define PCM1789_MUTE_SRET 0x06
struct pcm1789_private {
struct regmap *regmap;
unsigned int format;
unsigned int rate;
struct gpio_desc *reset;
struct work_struct work;
struct device *dev;
};
static const struct reg_default pcm1789_reg_defaults[] = {
{ PCM1789_FMT_CONTROL, 0x00 },
{ PCM1789_SOFT_MUTE, 0x00 },
{ PCM1789_DAC_VOL_LEFT, 0xff },
{ PCM1789_DAC_VOL_RIGHT, 0xff },
};
static bool pcm1789_accessible_reg(struct device *dev, unsigned int reg)
{
return reg >= PCM1789_MUTE_CONTROL && reg <= PCM1789_DAC_VOL_RIGHT;
}
static bool pcm1789_writeable_reg(struct device *dev, unsigned int reg)
{
return pcm1789_accessible_reg(dev, reg);
}
static int pcm1789_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_component *component = codec_dai->component;
struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
priv->format = format;
return 0;
}
static int pcm1789_digital_mute(struct snd_soc_dai *codec_dai, int mute)
{
struct snd_soc_component *component = codec_dai->component;
struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
return regmap_update_bits(priv->regmap, PCM1789_SOFT_MUTE,
PCM1789_MUTE_MASK,
mute ? 0 : PCM1789_MUTE_MASK);
}
static int pcm1789_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *codec_dai)
{
struct snd_soc_component *component = codec_dai->component;
struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
int val = 0, ret;
priv->rate = params_rate(params);
switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
switch (params_width(params)) {
case 24:
val = 2;
break;
case 16:
val = 3;
break;
default:
return -EINVAL;
}
break;
case SND_SOC_DAIFMT_I2S:
switch (params_width(params)) {
case 16:
case 24:
case 32:
val = 0;
break;
default:
return -EINVAL;
}
break;
case SND_SOC_DAIFMT_LEFT_J:
switch (params_width(params)) {
case 16:
case 24:
case 32:
val = 1;
break;
default:
return -EINVAL;
}
break;
default:
dev_err(component->dev, "Invalid DAI format\n");
return -EINVAL;
}
ret = regmap_update_bits(priv->regmap, PCM1789_FMT_CONTROL,
PCM1789_FMT_MASK, val);
if (ret < 0)
return ret;
return 0;
}
static void pcm1789_work_queue(struct work_struct *work)
{
struct pcm1789_private *priv = container_of(work,
struct pcm1789_private,
work);
/* Perform a software reset to remove codec from desynchronized state */
if (regmap_update_bits(priv->regmap, PCM1789_MUTE_CONTROL,
0x3 << PCM1789_MUTE_SRET, 0) < 0)
dev_err(priv->dev, "Error while setting SRET");
}
static int pcm1789_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
schedule_work(&priv->work);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
break;
default:
ret = -EINVAL;
}
return ret;
}
static const struct snd_soc_dai_ops pcm1789_dai_ops = {
.set_fmt = pcm1789_set_dai_fmt,
.hw_params = pcm1789_hw_params,
.digital_mute = pcm1789_digital_mute,
.trigger = pcm1789_trigger,
};
static const DECLARE_TLV_DB_SCALE(pcm1789_dac_tlv, -12000, 50, 1);
static const struct snd_kcontrol_new pcm1789_controls[] = {
SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1789_DAC_VOL_LEFT,
PCM1789_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
pcm1789_dac_tlv),
};
static const struct snd_soc_dapm_widget pcm1789_dapm_widgets[] = {
SND_SOC_DAPM_OUTPUT("IOUTL+"),
SND_SOC_DAPM_OUTPUT("IOUTL-"),
SND_SOC_DAPM_OUTPUT("IOUTR+"),
SND_SOC_DAPM_OUTPUT("IOUTR-"),
};
static const struct snd_soc_dapm_route pcm1789_dapm_routes[] = {
{ "IOUTL+", NULL, "Playback" },
{ "IOUTL-", NULL, "Playback" },
{ "IOUTR+", NULL, "Playback" },
{ "IOUTR-", NULL, "Playback" },
};
static struct snd_soc_dai_driver pcm1789_dai = {
.name = "pcm1789-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_CONTINUOUS,
.rate_min = 10000,
.rate_max = 200000,
.formats = PCM1789_FORMATS,
},
.ops = &pcm1789_dai_ops,
};
const struct regmap_config pcm1789_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = PCM1789_DAC_VOL_RIGHT,
.reg_defaults = pcm1789_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(pcm1789_reg_defaults),
.writeable_reg = pcm1789_writeable_reg,
.readable_reg = pcm1789_accessible_reg,
};
EXPORT_SYMBOL_GPL(pcm1789_regmap_config);
static const struct snd_soc_component_driver soc_component_dev_pcm1789 = {
.controls = pcm1789_controls,
.num_controls = ARRAY_SIZE(pcm1789_controls),
.dapm_widgets = pcm1789_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(pcm1789_dapm_widgets),
.dapm_routes = pcm1789_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(pcm1789_dapm_routes),
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
.non_legacy_dai_naming = 1,
};
int pcm1789_common_init(struct device *dev, struct regmap *regmap)
{
struct pcm1789_private *pcm1789;
pcm1789 = devm_kzalloc(dev, sizeof(struct pcm1789_private),
GFP_KERNEL);
if (!pcm1789)
return -ENOMEM;
pcm1789->regmap = regmap;
pcm1789->dev = dev;
dev_set_drvdata(dev, pcm1789);
pcm1789->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(pcm1789->reset))
return PTR_ERR(pcm1789->reset);
gpiod_set_value_cansleep(pcm1789->reset, 0);
msleep(300);
INIT_WORK(&pcm1789->work, pcm1789_work_queue);
return devm_snd_soc_register_component(dev, &soc_component_dev_pcm1789,
&pcm1789_dai, 1);
}
EXPORT_SYMBOL_GPL(pcm1789_common_init);
int pcm1789_common_exit(struct device *dev)
{
struct pcm1789_private *priv = dev_get_drvdata(dev);
if (&priv->work)
flush_work(&priv->work);
return 0;
}
EXPORT_SYMBOL_GPL(pcm1789_common_exit);
MODULE_DESCRIPTION("ASoC PCM1789 driver");
MODULE_AUTHOR("Mylène Josserand <mylene.josserand@free-electrons.com>");
MODULE_LICENSE("GPL");
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