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// SPDX-License-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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