ASoC: nau8315: add codec driver

Add codec driver for Nuvoton NAU8315.

Signed-off-by: David Lin <CTLIN0@nuvoton.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20201102023212.594137-1-CTLIN0@nuvoton.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/nau8315.txt b/Documentation/devicetree/bindings/sound/nau8315.txt
new file mode 100644 (file)
index 0000000..6eaec46
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/nau8315.txt
@@ -0,0 +1,18 @@
+Nuvoton NAU8315 Mono Class-D Amplifier
+
+Required properties:
+- compatible   : "nuvoton,nau8315"
+
+Optional properties:
+- enable-gpios : GPIO specifier for the chip's device enable input(EN) pin.
+        If this option is not specified then driver does not manage
+        the pin state (e.g. chip is always on).
+
+Example:
+
+#include <dt-bindings/gpio/gpio.h>
+
+nau8315 {
+       compatible = "nuvoton,nau8315";
+       enable-gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;
+};

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 5791b7056af65c239ce904d2292697168c746d2f..2b6eceb3573c899b3b9b03a5129a032cd4a14c32 100644 (file)
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -130,6 +130,7 @@ config SND_SOC_ALL_CODECS
        imply SND_SOC_MT6358
        imply SND_SOC_MT6359
        imply SND_SOC_MT6660
+       imply SND_SOC_NAU8315
        imply SND_SOC_NAU8540
        imply SND_SOC_NAU8810
        imply SND_SOC_NAU8822
@@ -1760,6 +1761,10 @@ config SND_SOC_MT6660
          Select N if you don't have MT6660 on board.
          Select M to build this as module.
 
+config SND_SOC_NAU8315
+       tristate "Nuvoton Technology Corporation NAU8315 CODEC"
+       depends on GPIOLIB
+
 config SND_SOC_NAU8540
        tristate "Nuvoton Technology Corporation NAU85L40 CODEC"
        depends on I2C

diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 11ce98c25d6cca68f13afc292fd8c03ea23fbc9f..144d9256d4d50d43cddcf882c716df51fac24240 100644 (file)
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -129,6 +129,7 @@ snd-soc-mt6351-objs := mt6351.o
 snd-soc-mt6358-objs := mt6358.o
 snd-soc-mt6359-objs := mt6359.o
 snd-soc-mt6660-objs := mt6660.o
+snd-soc-nau8315-objs := nau8315.o
 snd-soc-nau8540-objs := nau8540.o
 snd-soc-nau8810-objs := nau8810.o
 snd-soc-nau8822-objs := nau8822.o
@@ -438,6 +439,7 @@ obj-$(CONFIG_SND_SOC_MT6351)        += snd-soc-mt6351.o
 obj-$(CONFIG_SND_SOC_MT6358)   += snd-soc-mt6358.o
 obj-$(CONFIG_SND_SOC_MT6359)   += snd-soc-mt6359.o
 obj-$(CONFIG_SND_SOC_MT6660)   += snd-soc-mt6660.o
+obj-$(CONFIG_SND_SOC_NAU8315)   += snd-soc-nau8315.o
 obj-$(CONFIG_SND_SOC_NAU8540)   += snd-soc-nau8540.o
 obj-$(CONFIG_SND_SOC_NAU8810)   += snd-soc-nau8810.o
 obj-$(CONFIG_SND_SOC_NAU8822)   += snd-soc-nau8822.o

diff --git a/sound/soc/codecs/nau8315.c b/sound/soc/codecs/nau8315.c
new file mode 100644 (file)
index 0000000..e6bc5c0
--- /dev/null
+++ b/sound/soc/codecs/nau8315.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// nau8315.c  --  NAU8315 ALSA SoC Audio Amplifier Driver
+//
+// Copyright 2020 Nuvoton Technology Crop.
+//
+// Author: David Lin <ctlin0@nuvoton.com>
+//
+// Based on MAX98357A.c
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.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 nau8315_priv {
+       struct gpio_desc *enable;
+       int enpin_switch;
+};
+
+static int nau8315_daiops_trigger(struct snd_pcm_substream *substream,
+               int cmd, struct snd_soc_dai *dai)
+{
+       struct snd_soc_component *component = dai->component;
+       struct nau8315_priv *nau8315 =
+               snd_soc_component_get_drvdata(component);
+
+       if (!nau8315->enable)
+               return 0;
+
+       switch (cmd) {
+       case SNDRV_PCM_TRIGGER_START:
+       case SNDRV_PCM_TRIGGER_RESUME:
+       case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+               if (nau8315->enpin_switch) {
+                       gpiod_set_value(nau8315->enable, 1);
+                       dev_dbg(component->dev, "set enable to 1");
+               }
+               break;
+       case SNDRV_PCM_TRIGGER_STOP:
+       case SNDRV_PCM_TRIGGER_SUSPEND:
+       case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+               gpiod_set_value(nau8315->enable, 0);
+               dev_dbg(component->dev, "set enable to 0");
+               break;
+       }
+
+       return 0;
+}
+
+static int nau8315_enpin_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 nau8315_priv *nau8315 =
+               snd_soc_component_get_drvdata(component);
+
+       if (event & SND_SOC_DAPM_POST_PMU)
+               nau8315->enpin_switch = 1;
+       else if (event & SND_SOC_DAPM_POST_PMD)
+               nau8315->enpin_switch = 0;
+
+       return 0;
+}
+
+static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = {
+       SND_SOC_DAPM_OUTPUT("Speaker"),
+       SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0,
+                       nau8315_enpin_event,
+                       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
+};
+
+static const struct snd_soc_dapm_route nau8315_dapm_routes[] = {
+       {"EN_Pin", NULL, "HiFi Playback"},
+       {"Speaker", NULL, "EN_Pin"},
+};
+
+static const struct snd_soc_component_driver nau8315_component_driver = {
+       .dapm_widgets           = nau8315_dapm_widgets,
+       .num_dapm_widgets       = ARRAY_SIZE(nau8315_dapm_widgets),
+       .dapm_routes            = nau8315_dapm_routes,
+       .num_dapm_routes        = ARRAY_SIZE(nau8315_dapm_routes),
+       .idle_bias_on           = 1,
+       .use_pmdown_time        = 1,
+       .endianness             = 1,
+       .non_legacy_dai_naming  = 1,
+};
+
+static const struct snd_soc_dai_ops nau8315_dai_ops = {
+       .trigger        = nau8315_daiops_trigger,
+};
+
+#define NAU8315_RATES SNDRV_PCM_RATE_8000_96000
+#define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE)
+
+static struct snd_soc_dai_driver nau8315_dai_driver = {
+       .name = "nau8315-hifi",
+       .playback = {
+               .stream_name    = "HiFi Playback",
+               .formats        = NAU8315_FORMATS,
+               .rates          = NAU8315_RATES,
+               .channels_min   = 1,
+               .channels_max   = 2,
+       },
+       .ops    = &nau8315_dai_ops,
+};
+
+static int nau8315_platform_probe(struct platform_device *pdev)
+{
+       struct nau8315_priv *nau8315;
+
+       nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL);
+       if (!nau8315)
+               return -ENOMEM;
+
+       nau8315->enable = devm_gpiod_get_optional(&pdev->dev,
+                               "enable", GPIOD_OUT_LOW);
+       if (IS_ERR(nau8315->enable))
+               return PTR_ERR(nau8315->enable);
+
+       dev_set_drvdata(&pdev->dev, nau8315);
+
+       return devm_snd_soc_register_component(&pdev->dev,
+                       &nau8315_component_driver,
+                       &nau8315_dai_driver, 1);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id nau8315_device_id[] = {
+       { .compatible = "nuvoton,nau8315" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, nau8315_device_id);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id nau8315_acpi_match[] = {
+       { "NVTN2010", 0 },
+       {},
+};
+MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);
+#endif
+
+static struct platform_driver nau8315_platform_driver = {
+       .driver = {
+               .name = "nau8315",
+               .of_match_table = of_match_ptr(nau8315_device_id),
+               .acpi_match_table = ACPI_PTR(nau8315_acpi_match),
+       },
+       .probe  = nau8315_platform_probe,
+};
+module_platform_driver(nau8315_platform_driver);
+
+MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");
+MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");
+MODULE_LICENSE("GPL v2");