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ASoC: max9759: Add Amplifier Driver
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The max9759 is a gpio controlled amplifier.
Tested on a Variscite Dart MX6 SoM based custom board.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Neil Armstrong authored and Mark Brown committed Feb 20, 2018
1 parent 01182d6 commit fa8d915
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Showing 3 changed files with 214 additions and 0 deletions.
5 changes: 5 additions & 0 deletions sound/soc/codecs/Kconfig
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Expand Up @@ -98,6 +98,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_MAX98373 if I2C
select SND_SOC_MAX9850 if I2C
select SND_SOC_MAX9860 if I2C
select SND_SOC_MAX9759
select SND_SOC_MAX9768 if I2C
select SND_SOC_MAX9877 if I2C
select SND_SOC_MC13783 if MFD_MC13XXX
Expand Down Expand Up @@ -1187,6 +1188,10 @@ config SND_SOC_ZX_AUD96P22
config SND_SOC_LM4857
tristate

config SND_SOC_MAX9759
tristate "Maxim MAX9759 speaker Amplifier"
select GPIOLIB

config SND_SOC_MAX9768
tristate

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2 changes: 2 additions & 0 deletions sound/soc/codecs/Makefile
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Expand Up @@ -80,6 +80,7 @@ snd-soc-jz4740-codec-objs := jz4740.o
snd-soc-l3-objs := l3.o
snd-soc-lm4857-objs := lm4857.o
snd-soc-lm49453-objs := lm49453.o
snd-soc-max9759-objs := max9759.o
snd-soc-max9768-objs := max9768.o
snd-soc-max98088-objs := max98088.o
snd-soc-max98090-objs := max98090.o
Expand Down Expand Up @@ -325,6 +326,7 @@ obj-$(CONFIG_SND_SOC_JZ4740_CODEC) += snd-soc-jz4740-codec.o
obj-$(CONFIG_SND_SOC_L3) += snd-soc-l3.o
obj-$(CONFIG_SND_SOC_LM4857) += snd-soc-lm4857.o
obj-$(CONFIG_SND_SOC_LM49453) += snd-soc-lm49453.o
obj-$(CONFIG_SND_SOC_MAX9759) += snd-soc-max9759.o
obj-$(CONFIG_SND_SOC_MAX9768) += snd-soc-max9768.o
obj-$(CONFIG_SND_SOC_MAX98088) += snd-soc-max98088.o
obj-$(CONFIG_SND_SOC_MAX98090) += snd-soc-max98090.o
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207 changes: 207 additions & 0 deletions sound/soc/codecs/max9759.c
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@@ -0,0 +1,207 @@
// SPDX-Licence-Identifier: GPL-2.0
/*
* MAX9759 Amplifier Driver
*
* Copyright (c) 2017 BayLibre, SAS.
* Author: Neil Armstrong <narmstrong@baylibre.com>
*/

#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/tlv.h>

#define DRV_NAME "max9759"

struct max9759 {
struct gpio_desc *gpiod_shutdown;
struct gpio_desc *gpiod_mute;
struct gpio_descs *gpiod_gain;
bool is_mute;
unsigned int gain;
};

static int pga_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *control, int event)
{
struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
struct max9759 *priv = snd_soc_component_get_drvdata(c);

if (SND_SOC_DAPM_EVENT_ON(event))
gpiod_set_value_cansleep(priv->gpiod_shutdown, 0);
else
gpiod_set_value_cansleep(priv->gpiod_shutdown, 1);

return 0;
}

/* From 6dB to 24dB in steps of 6dB */
static const DECLARE_TLV_DB_SCALE(speaker_gain_tlv, 600, 600, 0);

static int speaker_gain_control_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
struct max9759 *priv = snd_soc_component_get_drvdata(c);

ucontrol->value.integer.value[0] = priv->gain;

return 0;
}

static const bool speaker_gain_table[4][2] = {
/* G1, G2 */
{true, true}, /* +6dB */
{false, true}, /* +12dB */
{true, false}, /* +18dB */
{false, false}, /* +24dB */
};

static int speaker_gain_control_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
struct max9759 *priv = snd_soc_component_get_drvdata(c);

if (ucontrol->value.integer.value[0] > 3)
return -EINVAL;

priv->gain = ucontrol->value.integer.value[0];

/* G1 */
gpiod_set_value_cansleep(priv->gpiod_gain->desc[0],
speaker_gain_table[priv->gain][0]);
/* G2 */
gpiod_set_value_cansleep(priv->gpiod_gain->desc[1],
speaker_gain_table[priv->gain][1]);

return 1;
}

static int speaker_mute_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
struct max9759 *priv = snd_soc_component_get_drvdata(c);

ucontrol->value.integer.value[0] = !priv->is_mute;

return 0;
}

static int speaker_mute_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
struct max9759 *priv = snd_soc_component_get_drvdata(c);

priv->is_mute = !ucontrol->value.integer.value[0];

gpiod_set_value_cansleep(priv->gpiod_mute, priv->is_mute);

return 1;
}

static const struct snd_kcontrol_new max9759_dapm_controls[] = {
SOC_SINGLE_EXT_TLV("Speaker Gain Volume", 0, 0, 3, 0,
speaker_gain_control_get, speaker_gain_control_put,
speaker_gain_tlv),
SOC_SINGLE_BOOL_EXT("Playback Switch", 0,
speaker_mute_get, speaker_mute_put),
};

static const struct snd_soc_dapm_widget max9759_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("INL"),
SND_SOC_DAPM_INPUT("INR"),
SND_SOC_DAPM_PGA_E("PGA", SND_SOC_NOPM, 0, 0, NULL, 0, pga_event,
(SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD)),
SND_SOC_DAPM_OUTPUT("OUTL"),
SND_SOC_DAPM_OUTPUT("OUTR"),
};

static const struct snd_soc_dapm_route max9759_dapm_routes[] = {
{ "PGA", NULL, "INL" },
{ "PGA", NULL, "INR" },
{ "OUTL", NULL, "PGA" },
{ "OUTR", NULL, "PGA" },
};

static const struct snd_soc_component_driver max9759_component_driver = {
.controls = max9759_dapm_controls,
.num_controls = ARRAY_SIZE(max9759_dapm_controls),
.dapm_widgets = max9759_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(max9759_dapm_widgets),
.dapm_routes = max9759_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(max9759_dapm_routes),
};

static int max9759_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct max9759 *priv;
int err;

priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;

platform_set_drvdata(pdev, priv);

priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown", GPIOD_OUT_HIGH);
if (IS_ERR(priv->gpiod_shutdown)) {
err = PTR_ERR(priv->gpiod_shutdown);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'shutdown' gpio: %d", err);
return err;
}

priv->gpiod_mute = devm_gpiod_get(dev, "mute", GPIOD_OUT_HIGH);
if (IS_ERR(priv->gpiod_mute)) {
err = PTR_ERR(priv->gpiod_mute);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'mute' gpio: %d", err);
return err;
}
priv->is_mute = true;

priv->gpiod_gain = devm_gpiod_get_array(dev, "gain", GPIOD_OUT_HIGH);
if (IS_ERR(priv->gpiod_gain)) {
err = PTR_ERR(priv->gpiod_gain);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'gain' gpios: %d", err);
return err;
}
priv->gain = 0;

if (priv->gpiod_gain->ndescs != 2) {
dev_err(dev, "Invalid 'gain' gpios count: %d",
priv->gpiod_gain->ndescs);
return -EINVAL;
}

return devm_snd_soc_register_component(dev, &max9759_component_driver,
NULL, 0);
}

#ifdef CONFIG_OF
static const struct of_device_id max9759_ids[] = {
{ .compatible = "maxim,max9759", },
{ }
};
MODULE_DEVICE_TABLE(of, max9759_ids);
#endif

static struct platform_driver max9759_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(max9759_ids),
},
.probe = max9759_probe,
};

module_platform_driver(max9759_driver);

MODULE_DESCRIPTION("ASoC MAX9759 amplifier driver");
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
MODULE_LICENSE("GPL");

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