[alsa-devel] [PATCH] ASoC: ics43432: Add codec driver for InvenSense ICS-43432
Ricard Wanderlof
ricard.wanderlof at axis.com
Thu Aug 13 15:55:17 CEST 2015
Add support for the InvenSense ICS-43432 I2S MEMS microphone.
This is a non-software-configurable MEMS microphone with I2S output.
Signed-off-by: Ricard Wanderlof <ricardw at axis.com>
---
.../devicetree/bindings/sound/ics43432.txt | 17 +++
.../devicetree/bindings/vendor-prefixes.txt | 1 +
sound/soc/codecs/Kconfig | 4 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/ics43432.c | 111 ++++++++++++++++++++
5 files changed, 135 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/ics43432.txt
create mode 100644 sound/soc/codecs/ics43432.c
diff --git a/Documentation/devicetree/bindings/sound/ics43432.txt b/Documentation/devicetree/bindings/sound/ics43432.txt
new file mode 100644
index 0000000..b02e3a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/ics43432.txt
@@ -0,0 +1,17 @@
+Invensense ICS-43432 MEMS microphone with I2S output.
+
+There are no software configuration options for this device, indeed, the only
+host connection is the I2S interface. Apart from requirements on clock
+frequency (460 kHz to 3.379 MHz according to the data sheet) there must be
+64 clock cycles in each stereo output frame; 24 of the 32 available bits
+contain audio data. A hardware pin determines if the device outputs data
+on the left or right channel of the I2S frame.
+
+Required properties:
+ - compatible : Must be "invensense,ics43432"
+
+Example:
+
+ ics43432: ics43432 {
+ compatible = "invensense,ics43432";
+ };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 8033919..7966637 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -103,6 +103,7 @@ img Imagination Technologies Ltd.
innolux Innolux Corporation
intel Intel Corporation
intercontrol Inter Control Group
+invensense InvenSense Inc.
isee ISEE 2007 S.L.
isil Intersil
karo Ka-Ro electronics GmbH
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 061c465..d696c85 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -62,6 +62,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_BT_SCO
select SND_SOC_ES8328_SPI if SPI_MASTER
select SND_SOC_ES8328_I2C if I2C
+ select SND_SOC_ICS43432
select SND_SOC_ISABELLE if I2C
select SND_SOC_JZ4740_CODEC
select SND_SOC_LM4857 if I2C
@@ -444,6 +445,9 @@ config SND_SOC_ES8328_SPI
tristate
select SND_SOC_ES8328
+config SND_SOC_ICS43432
+ tristate
+
config SND_SOC_ISABELLE
tristate
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index abe2d7e..23a2caf 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -55,6 +55,7 @@ snd-soc-dmic-objs := dmic.o
snd-soc-es8328-objs := es8328.o
snd-soc-es8328-i2c-objs := es8328-i2c.o
snd-soc-es8328-spi-objs := es8328-spi.o
+snd-soc-ics43432-objs := ics43432.o
snd-soc-isabelle-objs := isabelle.o
snd-soc-jz4740-codec-objs := jz4740.o
snd-soc-l3-objs := l3.o
@@ -240,6 +241,7 @@ obj-$(CONFIG_SND_SOC_DMIC) += snd-soc-dmic.o
obj-$(CONFIG_SND_SOC_ES8328) += snd-soc-es8328.o
obj-$(CONFIG_SND_SOC_ES8328_I2C)+= snd-soc-es8328-i2c.o
obj-$(CONFIG_SND_SOC_ES8328_SPI)+= snd-soc-es8328-spi.o
+obj-$(CONFIG_SND_SOC_ICS43432) += snd-soc-ics43432.o
obj-$(CONFIG_SND_SOC_ISABELLE) += snd-soc-isabelle.o
obj-$(CONFIG_SND_SOC_JZ4740_CODEC) += snd-soc-jz4740-codec.o
obj-$(CONFIG_SND_SOC_L3) += snd-soc-l3.o
diff --git a/sound/soc/codecs/ics43432.c b/sound/soc/codecs/ics43432.c
new file mode 100644
index 0000000..902daae
--- /dev/null
+++ b/sound/soc/codecs/ics43432.c
@@ -0,0 +1,111 @@
+/*
+ * I2S MEMS microphone driver for InvenSense ICS-43432
+ *
+ * - Non configurable.
+ * - I2S interface, 64 BCLs per frame, 32 bits per channel, 24 bit data
+ *
+ * Copyright (c) 2015 Axis Communications AB
+ *
+ * Licensed under GPL2.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
+#include <sound/tlv.h>
+
+#define ICS43432_RATE_MIN 7190 /* Hz, from data sheet */
+#define ICS43432_RATE_MAX 52800 /* Hz, from data sheet */
+
+static int ics43432_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+ unsigned int rate = params_rate(params);
+
+ if (rate < ICS43432_RATE_MIN || rate > ICS43432_RATE_MAX)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int ics43432_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+#define ICS43432_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32)
+
+static const struct snd_soc_dai_ops ics43432_dai_ops = {
+ .hw_params = ics43432_hw_params,
+ .set_fmt = ics43432_set_dai_fmt,
+};
+
+static struct snd_soc_dai_driver ics43432_dai = {
+ .name = "ics43432-hifi",
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = ICS43432_FORMATS,
+ },
+ .ops = &ics43432_dai_ops,
+};
+
+static struct snd_soc_codec_driver ics43432_codec_driver = {
+};
+
+static int ics43432_probe(struct platform_device *pdev)
+{
+ return snd_soc_register_codec(&pdev->dev, &ics43432_codec_driver,
+ &ics43432_dai, 1);
+}
+
+static int ics43432_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_codec(&pdev->dev);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id ics43432_ids[] = {
+ { .compatible = "invensense,ics43432", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ics43432_dt_ids);
+#endif
+
+static struct platform_driver ics43432_driver = {
+ .driver = {
+ .name = "ics43432",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ics43432_ids),
+ },
+ .probe = ics43432_probe,
+ .remove = ics43432_remove,
+};
+
+module_platform_driver(ics43432_driver);
+
+MODULE_DESCRIPTION("ASoC ICS43432 driver");
+MODULE_AUTHOR("Ricard Wanderlof <ricardw at axis.com>");
+MODULE_LICENSE("GPL2");
--
1.7.10.4
--
Ricard Wolf Wanderlöf ricardw(at)axis.com
Axis Communications AB, Lund, Sweden www.axis.com
Phone +46 46 272 2016 Fax +46 46 13 61 30
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