[PATCH] iio: adc: mcp3422: Add support for MCP3425

[Akinobu Mita <akinobu.mita@gmail.com>]

The MCP3425 is a single channel up to 16-bit A/D converter which has
features:

- On-Board Programmable Gain Amplifier (PGA):
 - Gains of 1, 2, 4 or 8
- Programmable Data Rate Options:
 - 15 SPS (16 bits), 60 SPS (14 bits), 240 SPS (12 bits)

So we can support MCP3425 with a little changes to mcp3422 driver.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: linux-iio@vger.kernel.org
---
 Documentation/devicetree/bindings/iio/adc/mcp3422.txt |  1 +
 drivers/iio/adc/Kconfig                               |  4 ++--
 drivers/iio/adc/mcp3422.c                             | 16 +++++++++++++---
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/adc/mcp3422.txt b/Documentation/devicetree/bindings/iio/adc/mcp3422.txt
index 333139c..84289bd 100644
--- a/Documentation/devicetree/bindings/iio/adc/mcp3422.txt
+++ b/Documentation/devicetree/bindings/iio/adc/mcp3422.txt
@@ -5,6 +5,7 @@ Required properties:
 	"microchip,mcp3422" or
 	"microchip,mcp3423" or
 	"microchip,mcp3424" or
+	"microchip,mcp3425" or
 	"microchip,mcp3426" or
 	"microchip,mcp3427" or
 	"microchip,mcp3428"
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 7868c74..e4b1de9 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -246,11 +246,11 @@ config MCP320X
 	  called mcp320x.
 
 config MCP3422
-	tristate "Microchip Technology MCP3422/3/4/6/7/8 driver"
+	tristate "Microchip Technology MCP3422/3/4/5/6/7/8 driver"
 	depends on I2C
 	help
 	  Say yes here to build support for Microchip Technology's
-	  MCP3422, MCP3423, MCP3424, MCP3426, MCP3427 or MCP3428
+	  MCP3422, MCP3423, MCP3424, MCP3425, MCP3426, MCP3427 or MCP3428
 	  analog to digital converters.
 
 	  This driver can also be built as a module. If so, the module will be
diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
index 3555122..ba0c3ad 100644
--- a/drivers/iio/adc/mcp3422.c
+++ b/drivers/iio/adc/mcp3422.c
@@ -1,11 +1,12 @@
 /*
- * mcp3422.c - driver for the Microchip mcp3422/3/4/6/7/8 chip family
+ * mcp3422.c - driver for the Microchip mcp3422/3/4/5/6/7/8 chip family
  *
  * Copyright (C) 2013, Angelo Compagnucci
  * Author: Angelo Compagnucci <angelo.compagnucci@gmail.com>
  *
  * Datasheet: http://ww1.microchip.com/downloads/en/devicedoc/22088b.pdf
  *            http://ww1.microchip.com/downloads/en/DeviceDoc/22226a.pdf
+ *            http://ww1.microchip.com/downloads/en/DeviceDoc/22072b.pdf
  *
  * This driver exports the value of analog input voltage to sysfs, the
  * voltage unit is nV.
@@ -317,6 +318,10 @@ static const struct iio_chan_spec mcp3424_channels[] = {
 	MCP3422_CHAN(3),
 };
 
+static const struct iio_chan_spec mcp3425_channels[] = {
+	MCP3422_CHAN(0),
+};
+
 static const struct iio_info mcp3422_info = {
 	.read_raw = mcp3422_read_raw,
 	.write_raw = mcp3422_write_raw,
@@ -352,6 +357,10 @@ static int mcp3422_probe(struct i2c_client *client,
 	indio_dev->info = &mcp3422_info;
 
 	switch (adc->id) {
+	case 5:
+		indio_dev->channels = mcp3425_channels;
+		indio_dev->num_channels = ARRAY_SIZE(mcp3425_channels);
+		break;
 	case 2:
 	case 3:
 	case 6:
@@ -368,7 +377,7 @@ static int mcp3422_probe(struct i2c_client *client,
 
 	/* meaningful default configuration */
 	config = (MCP3422_CONT_SAMPLING
-		| MCP3422_CHANNEL_VALUE(1)
+		| MCP3422_CHANNEL_VALUE(0)
 		| MCP3422_PGA_VALUE(MCP3422_PGA_1)
 		| MCP3422_SAMPLE_RATE_VALUE(MCP3422_SRATE_240));
 	mcp3422_update_config(adc, config);
@@ -386,6 +395,7 @@ static const struct i2c_device_id mcp3422_id[] = {
 	{ "mcp3422", 2 },
 	{ "mcp3423", 3 },
 	{ "mcp3424", 4 },
+	{ "mcp3425", 5 },
 	{ "mcp3426", 6 },
 	{ "mcp3427", 7 },
 	{ "mcp3428", 8 },
@@ -412,5 +422,5 @@ static struct i2c_driver mcp3422_driver = {
 module_i2c_driver(mcp3422_driver);
 
 MODULE_AUTHOR("Angelo Compagnucci <angelo.compagnucci@gmail.com>");
-MODULE_DESCRIPTION("Microchip mcp3422/3/4/6/7/8 driver");
+MODULE_DESCRIPTION("Microchip mcp3422/3/4/5/6/7/8 driver");
 MODULE_LICENSE("GPL v2");
-- 
1.9.1