new file mode 100644
@@ -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";
+ };
@@ -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
@@ -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
@@ -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
new file mode 100644
@@ -0,0 +1,101 @@
+/*
+ * 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_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 = {
+ .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,
+ .rate_min = ICS43432_RATE_MIN,
+ .rate_max = ICS43432_RATE_MAX,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .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@axis.com>");
+MODULE_LICENSE("GPLv2");
Add support for the InvenSense ICS-43432 I2S MEMS microphone. This is a non-software-configurable MEMS microphone with I2S output. Tested on a setup with a single ICS-43432, although the device itself supports stereo operation using a hardware pin controlling left vs. right channel output. Signed-off-by: Ricard Wanderlof <ricardw@axis.com> --- V4: Updated commit message that the driver has been tested with real hardware, after off-list comment on V3. V3: Fixed MODULE_LICENSE string. V2: Update after comments from Lars-Peter: set rate to CONTINUOUS and let ALSA figure out the details, also removing hw_params as it is then not needed. I've left the checks in dai_set_fmt, as (IIUC) there currently doesn't seem to be a way for the ALSA framework to handle format constraints using the codec configuration struct. .../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 | 101 ++++++++++++++++++++ 5 files changed, 125 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/ics43432.txt create mode 100644 sound/soc/codecs/ics43432.c