diff options
Diffstat (limited to 'sound/soc/codecs/max98357a.c')
| -rw-r--r-- | sound/soc/codecs/max98357a.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/sound/soc/codecs/max98357a.c b/sound/soc/codecs/max98357a.c new file mode 100644 index 000000000..2a2b286f1 --- /dev/null +++ b/sound/soc/codecs/max98357a.c @@ -0,0 +1,183 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved. + * + * max98357a.c -- MAX98357A ALSA SoC Codec driver + */ + +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/gpio/consumer.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <sound/pcm.h> +#include <sound/soc.h> +#include <sound/soc-dai.h> +#include <sound/soc-dapm.h> + +struct max98357a_priv { + struct gpio_desc *sdmode; + unsigned int sdmode_delay; + int sdmode_switch; +}; + +static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, + int cmd, struct snd_soc_dai *dai) +{ + struct snd_soc_component *component = dai->component; + struct max98357a_priv *max98357a = + snd_soc_component_get_drvdata(component); + + if (!max98357a->sdmode) + return 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + mdelay(max98357a->sdmode_delay); + if (max98357a->sdmode_switch) { + gpiod_set_value(max98357a->sdmode, 1); + dev_dbg(component->dev, "set sdmode to 1"); + } + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + gpiod_set_value(max98357a->sdmode, 0); + dev_dbg(component->dev, "set sdmode to 0"); + break; + } + + return 0; +} + +static int max98357a_sdmode_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 max98357a_priv *max98357a = + snd_soc_component_get_drvdata(component); + + if (event & SND_SOC_DAPM_POST_PMU) + max98357a->sdmode_switch = 1; + else if (event & SND_SOC_DAPM_POST_PMD) + max98357a->sdmode_switch = 0; + + return 0; +} + +static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { + SND_SOC_DAPM_OUTPUT("Speaker"), + SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0, + max98357a_sdmode_event, + SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD), +}; + +static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { + {"SD_MODE", NULL, "HiFi Playback"}, + {"Speaker", NULL, "SD_MODE"}, +}; + +static const struct snd_soc_component_driver max98357a_component_driver = { + .dapm_widgets = max98357a_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), + .dapm_routes = max98357a_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), + .idle_bias_on = 1, + .use_pmdown_time = 1, + .endianness = 1, +}; + +static const struct snd_soc_dai_ops max98357a_dai_ops = { + .trigger = max98357a_daiops_trigger, +}; + +static struct snd_soc_dai_driver max98357a_dai_driver = { + .name = "HiFi", + .playback = { + .stream_name = "HiFi Playback", + .formats = SNDRV_PCM_FMTBIT_S16 | + SNDRV_PCM_FMTBIT_S24 | + SNDRV_PCM_FMTBIT_S32, + .rates = SNDRV_PCM_RATE_8000 | + SNDRV_PCM_RATE_16000 | + SNDRV_PCM_RATE_32000 | + SNDRV_PCM_RATE_44100 | + SNDRV_PCM_RATE_48000 | + SNDRV_PCM_RATE_88200 | + SNDRV_PCM_RATE_96000, + .rate_min = 8000, + .rate_max = 96000, + .channels_min = 1, + .channels_max = 2, + }, + .ops = &max98357a_dai_ops, +}; + +static int max98357a_platform_probe(struct platform_device *pdev) +{ + struct max98357a_priv *max98357a; + int ret; + + max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL); + if (!max98357a) + return -ENOMEM; + + max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev, + "sdmode", GPIOD_OUT_LOW); + if (IS_ERR(max98357a->sdmode)) + return PTR_ERR(max98357a->sdmode); + + ret = device_property_read_u32(&pdev->dev, "sdmode-delay", + &max98357a->sdmode_delay); + if (ret) { + max98357a->sdmode_delay = 0; + dev_dbg(&pdev->dev, + "no optional property 'sdmode-delay' found, " + "default: no delay\n"); + } + + dev_set_drvdata(&pdev->dev, max98357a); + + return devm_snd_soc_register_component(&pdev->dev, + &max98357a_component_driver, + &max98357a_dai_driver, 1); +} + +#ifdef CONFIG_OF +static const struct of_device_id max98357a_device_id[] = { + { .compatible = "maxim,max98357a" }, + { .compatible = "maxim,max98360a" }, + {} +}; +MODULE_DEVICE_TABLE(of, max98357a_device_id); +#endif + +#ifdef CONFIG_ACPI +static const struct acpi_device_id max98357a_acpi_match[] = { + { "MX98357A", 0 }, + { "MX98360A", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match); +#endif + +static struct platform_driver max98357a_platform_driver = { + .driver = { + .name = "max98357a", + .of_match_table = of_match_ptr(max98357a_device_id), + .acpi_match_table = ACPI_PTR(max98357a_acpi_match), + }, + .probe = max98357a_platform_probe, +}; +module_platform_driver(max98357a_platform_driver); + +MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); +MODULE_LICENSE("GPL v2"); |