[alsa-devel] [PATCH] ALSA: ASoC: Add codec driver for AK5386
Daniel Mack
zonque at gmail.com
Fri Mar 8 12:07:28 CET 2013
Adds a driver for Asahi Kasei's AK5386 Single-ended 24-Bit 192kHz
delta-sigma ADC. The device has no control port interface but an
optional RESET/PDN GPIO pin.
Signed-off-by: Daniel Mack <zonque at gmail.com>
---
Documentation/devicetree/bindings/sound/ak5386.txt | 19 +++
sound/soc/codecs/Kconfig | 4 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/ak5386.c | 152 +++++++++++++++++++++
4 files changed, 177 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/ak5386.txt
create mode 100644 sound/soc/codecs/ak5386.c
diff --git a/Documentation/devicetree/bindings/sound/ak5386.txt b/Documentation/devicetree/bindings/sound/ak5386.txt
new file mode 100644
index 0000000..dc3914f
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/ak5386.txt
@@ -0,0 +1,19 @@
+AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
+
+This device has no control interface.
+
+Required properties:
+
+ - compatible : "asahi-kasei,ak5386"
+
+Optional properties:
+
+ - reset-gpio : a GPIO spec for the reset/power down pin.
+ If specified, it will be deasserted at probe time.
+
+Example:
+
+spdif: ak5386 at 0 {
+ compatible = "asahi-kasei,ak5386";
+ reset-gpio = <&gpio0 23>;
+};
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 86b3524..18fea10 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -26,6 +26,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_AK4641 if I2C
select SND_SOC_AK4642 if I2C
select SND_SOC_AK4671 if I2C
+ select SND_SOC_AK5386
select SND_SOC_ALC5623 if I2C
select SND_SOC_ALC5632 if I2C
select SND_SOC_CQ0093VC if MFD_DAVINCI_VOICECODEC
@@ -204,6 +205,9 @@ config SND_SOC_AK4642
config SND_SOC_AK4671
tristate
+config SND_SOC_AK5386
+ tristate
+
config SND_SOC_ALC5623
tristate
config SND_SOC_ALC5632
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 8077bc2..b9e41c9 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -14,6 +14,7 @@ snd-soc-ak4535-objs := ak4535.o
snd-soc-ak4641-objs := ak4641.o
snd-soc-ak4642-objs := ak4642.o
snd-soc-ak4671-objs := ak4671.o
+snd-soc-ak5386-objs := ak5386.o
snd-soc-arizona-objs := arizona.o
snd-soc-cq93vc-objs := cq93vc.o
snd-soc-cs42l51-objs := cs42l51.o
@@ -138,6 +139,7 @@ obj-$(CONFIG_SND_SOC_AK4535) += snd-soc-ak4535.o
obj-$(CONFIG_SND_SOC_AK4641) += snd-soc-ak4641.o
obj-$(CONFIG_SND_SOC_AK4642) += snd-soc-ak4642.o
obj-$(CONFIG_SND_SOC_AK4671) += snd-soc-ak4671.o
+obj-$(CONFIG_SND_SOC_AK5386) += snd-soc-ak5386.o
obj-$(CONFIG_SND_SOC_ALC5623) += snd-soc-alc5623.o
obj-$(CONFIG_SND_SOC_ALC5632) += snd-soc-alc5632.o
obj-$(CONFIG_SND_SOC_ARIZONA) += snd-soc-arizona.o
diff --git a/sound/soc/codecs/ak5386.c b/sound/soc/codecs/ak5386.c
new file mode 100644
index 0000000..1f30398
--- /dev/null
+++ b/sound/soc/codecs/ak5386.c
@@ -0,0 +1,152 @@
+/*
+ * ALSA SoC driver for
+ * Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
+ *
+ * (c) 2013 Daniel Mack <zonque at gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
+#include <sound/soc.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+
+struct ak5386_priv {
+ int reset_gpio;
+};
+
+static struct snd_soc_codec_driver soc_codec_ak5386;
+
+static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
+ unsigned int format)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+
+ format &= SND_SOC_DAIFMT_FORMAT_MASK;
+ if (format != SND_SOC_DAIFMT_LEFT_J &&
+ format != SND_SOC_DAIFMT_I2S) {
+ dev_err(codec->dev, "Invalid DAI format\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ak5386_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
+
+ /*
+ * From the datasheet:
+ *
+ * All external clocks (MCLK, SCLK and LRCK) must be present unless
+ * PDN pin = “L”. If these clocks are not provided, the AK5386 may
+ * draw excess current due to its use of internal dynamically
+ * refreshed logic. If the external clocks are not present, place
+ * the AK5386 in power-down mode (PDN pin = “L”).
+ */
+
+ if (gpio_is_valid(priv->reset_gpio))
+ gpio_set_value(priv->reset_gpio, 1);
+
+ return 0;
+}
+
+static int ak5386_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
+
+ if (gpio_is_valid(priv->reset_gpio))
+ gpio_set_value(priv->reset_gpio, 0);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops ak5386_dai_ops = {
+ .set_fmt = ak5386_set_dai_fmt,
+ .hw_params = ak5386_hw_params,
+ .hw_free = ak5386_hw_free,
+};
+
+static struct snd_soc_dai_driver ak5386_dai = {
+ .name = "ak5386-hifi",
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S8 |
+ SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S24_LE |
+ SNDRV_PCM_FMTBIT_S24_3LE,
+ },
+ .ops = &ak5386_dai_ops,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id ak5386_dt_ids[] = {
+ { .compatible = "asahi-kasei,ak5386", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
+#endif
+
+static int ak5386_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ak5386_priv *priv;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->reset_gpio = -EINVAL;
+ dev_set_drvdata(dev, priv);
+
+ if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
+ priv->reset_gpio = of_get_named_gpio(dev->of_node,
+ "reset-gpio", 0);
+
+ if (gpio_is_valid(priv->reset_gpio))
+ if (devm_gpio_request_one(dev, priv->reset_gpio,
+ GPIOF_OUT_INIT_LOW,
+ "AK5386 Reset"))
+ priv->reset_gpio = -EINVAL;
+
+ return snd_soc_register_codec(dev, &soc_codec_ak5386,
+ &ak5386_dai, 1);
+}
+
+static int ak5386_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_codec(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver ak5386_driver = {
+ .probe = ak5386_probe,
+ .remove = ak5386_remove,
+ .driver = {
+ .name = "ak5386",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ak5386_dt_ids),
+ },
+};
+
+module_platform_driver(ak5386_driver);
+
+MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
+MODULE_AUTHOR("Daniel Mack <zonque at gmail.com>");
+MODULE_LICENSE("GPL");
--
1.8.1.4
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