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Commit 2816ac64 authored by Angelo Compagnucci's avatar Angelo Compagnucci Committed by Jonathan Cameron
Browse files

Add support for Microchip Technology's MCP3426/7/8 ADC 



This patch extends previous mcp3422 driver to support
missing members of the family, mcp3426/7/8.

Signed-off-by: default avatarAngelo Compagnucci <angelo.compagnucci@gmail.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent bd75afaa

drivers/iio/adc/Kconfig

+4 −3
Original line number Diff line number Diff line
@@ -157,11 +157,12 @@ config MCP320X 
	  called mcp320x.



config MCP3422

	tristate "Microchip Technology MCP3422/3/4 driver"

	tristate "Microchip Technology MCP3422/3/4/6/7/8 driver"

	depends on I2C

	help

	  Say yes here to build support for Microchip Technology's MCP3422,

	  MCP3423 or MCP3424 analog to digital converters.

	  Say yes here to build support for Microchip Technology's

	  MCP3422, MCP3423, MCP3424, MCP3426, MCP3427 or MCP3428

	  analog to digital converters.



	  This driver can also be built as a module. If so, the module will be

	  called mcp3422.

drivers/iio/adc/mcp3422.c

+28 −5
Original line number Diff line number Diff line 
/*

 * mcp3422.c - driver for the Microchip mcp3422/3/4 chip family

 * mcp3422.c - driver for the Microchip mcp3422/3/4/6/7/8 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

 *

 * This driver exports the value of analog input voltage to sysfs, the

 * voltage unit is nV.
@@ -96,6 +97,7 @@ static const int mcp3422_sign_extend[4] = { 
/* Client data (each client gets its own) */

struct mcp3422 {

	struct i2c_client *i2c;

	u8 id;

	u8 config;

	u8 pga[4];

	struct mutex lock;
@@ -238,6 +240,8 @@ static int mcp3422_write_raw(struct iio_dev *iio, 
			temp = MCP3422_SRATE_15;

			break;

		case 3:

			if (adc->id > 4)

				return -EINVAL;

			temp = MCP3422_SRATE_3;

			break;

		default:
@@ -271,6 +275,17 @@ static int mcp3422_write_raw_get_fmt(struct iio_dev *indio_dev, 
	}

}



static ssize_t mcp3422_show_samp_freqs(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct mcp3422 *adc = iio_priv(dev_to_iio_dev(dev));



	if (adc->id > 4)

		return sprintf(buf, "240 60 15\n");



	return sprintf(buf, "240 60 15 3\n");

}



static ssize_t mcp3422_show_scales(struct device *dev,

		struct device_attribute *attr, char *buf)

{
@@ -284,12 +299,13 @@ static ssize_t mcp3422_show_scales(struct device *dev, 
		mcp3422_scales[sample_rate][3]);

}



static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("240 60 15 3");

static IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO,

		mcp3422_show_samp_freqs, NULL, 0);

static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO,

		mcp3422_show_scales, NULL, 0);



static struct attribute *mcp3422_attributes[] = {

	&iio_const_attr_sampling_frequency_available.dev_attr.attr,

	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,

	&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,

	NULL,

};
@@ -335,6 +351,7 @@ static int mcp3422_probe(struct i2c_client *client, 


	adc = iio_priv(indio_dev);

	adc->i2c = client;

	adc->id = (u8)(id->driver_data);



	mutex_init(&adc->lock);
@@ -343,13 +360,16 @@ static int mcp3422_probe(struct i2c_client *client, 
	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->info = &mcp3422_info;



	switch ((unsigned int)(id->driver_data)) {

	switch (adc->id) {

	case 2:

	case 3:

	case 6:

	case 7:

		indio_dev->channels = mcp3422_channels;

		indio_dev->num_channels = ARRAY_SIZE(mcp3422_channels);

		break;

	case 4:

	case 8:

		indio_dev->channels = mcp3424_channels;

		indio_dev->num_channels = ARRAY_SIZE(mcp3424_channels);

		break;
@@ -375,6 +395,9 @@ static const struct i2c_device_id mcp3422_id[] = { 
	{ "mcp3422", 2 },

	{ "mcp3423", 3 },

	{ "mcp3424", 4 },

	{ "mcp3426", 6 },

	{ "mcp3427", 7 },

	{ "mcp3428", 8 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, mcp3422_id);
@@ -399,5 +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 driver");

MODULE_DESCRIPTION("Microchip mcp3422/3/4/6/7/8 driver");

MODULE_LICENSE("GPL v2");