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Subject[PATCH 2/3] ASoC: pcm179x: Add I2C interface driver
Date
The PCM179x family supports both SPI and I2C. This patch adds support
for the I2C interface.

Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jacob Siverskog <jacob@teenage.engineering>
---
.../devicetree/bindings/sound/pcm179x.txt | 11 ++-
sound/soc/codecs/Kconfig | 9 +++
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/pcm179x-i2c.c | 82 ++++++++++++++++++++++
4 files changed, 103 insertions(+), 1 deletion(-)
create mode 100644 sound/soc/codecs/pcm179x-i2c.c

diff --git a/Documentation/devicetree/bindings/sound/pcm179x.txt b/Documentation/devicetree/bindings/sound/pcm179x.txt
index 4ae70d3..436c2b2 100644
--- a/Documentation/devicetree/bindings/sound/pcm179x.txt
+++ b/Documentation/devicetree/bindings/sound/pcm179x.txt
@@ -1,6 +1,6 @@
Texas Instruments pcm179x DT bindings

-This driver supports the SPI bus.
+This driver supports both the I2C and SPI bus.

Required properties:

@@ -9,6 +9,11 @@ Required properties:
For required properties on SPI, please consult
Documentation/devicetree/bindings/spi/spi-bus.txt

+Required properties on I2C:
+
+ - reg: the I2C address
+
+
Examples:

codec_spi: 1792a@0 {
@@ -16,3 +21,7 @@ Examples:
spi-max-frequency = <600000>;
};

+ codec_i2c: 1792a@4c {
+ compatible = "ti,pcm1792a";
+ reg = <0x4c>;
+ };
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index eaf13cb..45269cc 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -87,6 +87,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_ML26124 if I2C
select SND_SOC_NAU8825 if I2C
select SND_SOC_PCM1681 if I2C
+ select SND_SOC_PCM179X_I2C if I2C
select SND_SOC_PCM179X_SPI if SPI_MASTER
select SND_SOC_PCM3008
select SND_SOC_PCM3168A_I2C if I2C
@@ -529,6 +530,14 @@ config SND_SOC_PCM1681
config SND_SOC_PCM179X
tristate

+config SND_SOC_PCM179X_I2C
+ tristate "Texas Instruments PCM179X CODEC family (I2C)"
+ depends on I2C
+ select SND_SOC_PCM179X
+ help
+ Enable support for Texas Instruments PCM179x CODEC family.
+ Select this if your PCM179x is connected via an I2C bus.
+
config SND_SOC_PCM179X_SPI
tristate "Texas Instruments PCM179X CODEC family (SPI)"
depends on SPI_MASTER
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 56e94d8..9acd777 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -81,6 +81,7 @@ snd-soc-ml26124-objs := ml26124.o
snd-soc-nau8825-objs := nau8825.o
snd-soc-pcm1681-objs := pcm1681.o
snd-soc-pcm179x-codec-objs := pcm179x.o
+snd-soc-pcm179x-i2c-objs := pcm179x-i2c.o
snd-soc-pcm179x-spi-objs := pcm179x-spi.o
snd-soc-pcm3008-objs := pcm3008.o
snd-soc-pcm3168a-objs := pcm3168a.o
@@ -286,6 +287,7 @@ obj-$(CONFIG_SND_SOC_ML26124) += snd-soc-ml26124.o
obj-$(CONFIG_SND_SOC_NAU8825) += snd-soc-nau8825.o
obj-$(CONFIG_SND_SOC_PCM1681) += snd-soc-pcm1681.o
obj-$(CONFIG_SND_SOC_PCM179X) += snd-soc-pcm179x-codec.o
+obj-$(CONFIG_SND_SOC_PCM179X_I2C) += snd-soc-pcm179x-i2c.o
obj-$(CONFIG_SND_SOC_PCM179X_SPI) += snd-soc-pcm179x-spi.o
obj-$(CONFIG_SND_SOC_PCM3008) += snd-soc-pcm3008.o
obj-$(CONFIG_SND_SOC_PCM3168A) += snd-soc-pcm3168a.o
diff --git a/sound/soc/codecs/pcm179x-i2c.c b/sound/soc/codecs/pcm179x-i2c.c
new file mode 100644
index 0000000..0b20870
--- /dev/null
+++ b/sound/soc/codecs/pcm179x-i2c.c
@@ -0,0 +1,82 @@
+/*
+ * PCM179X ASoC I2C driver
+ *
+ * Copyright (c) Teenage Engineering AB 2016
+ *
+ * Jacob Siverskog <jacob@teenage.engineering>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+
+#include "pcm179x.h"
+
+static int pcm179x_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct pcm179x_private *pcm179x;
+ int ret;
+
+ pcm179x = devm_kzalloc(&client->dev, sizeof(struct pcm179x_private),
+ GFP_KERNEL);
+ if (!pcm179x)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, pcm179x);
+
+ pcm179x->dev = &client->dev;
+
+ pcm179x->regmap = devm_regmap_init_i2c(client, &pcm179x_regmap_config);
+ if (IS_ERR(pcm179x->regmap)) {
+ ret = PTR_ERR(pcm179x->regmap);
+ dev_err(&client->dev, "Failed to register regmap: %d\n", ret);
+ return ret;
+ }
+
+ return pcm179x_common_init(pcm179x);
+}
+
+static int pcm179x_i2c_remove(struct i2c_client *client)
+{
+ return pcm179x_common_exit(i2c_get_clientdata(client));
+}
+
+const struct of_device_id pcm179x_of_match[] = {
+ { .compatible = "ti,pcm1792a", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pcm179x_of_match);
+
+static const struct i2c_device_id pcm179x_i2c_ids[] = {
+ { "pcm179x", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pcm179x_i2c_ids);
+
+static struct i2c_driver pcm179x_i2c_driver = {
+ .driver = {
+ .name = "pcm179x",
+ .of_match_table = of_match_ptr(pcm179x_of_match),
+ },
+ .id_table = pcm179x_i2c_ids,
+ .probe = pcm179x_i2c_probe,
+ .remove = pcm179x_i2c_remove,
+};
+
+module_i2c_driver(pcm179x_i2c_driver);
+
+MODULE_DESCRIPTION("ASoC PCM179X I2C driver");
+MODULE_AUTHOR("Jacob Siverskog <jacob@teenage.engineering>");
+MODULE_LICENSE("GPL");
--
2.7.0

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