Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f225951d authored by Hans de Goede's avatar Hans de Goede Committed by Jonathan Cameron
Browse files

iio: accel: Add driver for the MiraMEMS DA280 3-axis 14-bit digital accelerometer 

Add an iio driver for the MiraMEMS DA280 3-axis 14-bit accelerometer, as
well as for the DA226 which is a fully compatible 2-axis version.

Datasheets for the DA280 and DA226 can be found at the manufacturers site:
http://www.miramems.com/en/products.asp?list=1



Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent a13e831f

Documentation/devicetree/bindings/i2c/trivial-devices.txt

+2 −0
Original line number Diff line number Diff line
@@ -125,6 +125,8 @@ microchip,mcp4662-502 Microchip 8-bit Dual I2C Digital Potentiometer with NV Mem 
microchip,mcp4662-103	Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (10k)

microchip,mcp4662-503	Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (50k)

microchip,mcp4662-104	Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (100k)

miramems,da226		MiraMEMS DA226 2-axis 14-bit digital accelerometer

miramems,da280		MiraMEMS DA280 3-axis 14-bit digital accelerometer

miramems,da311		MiraMEMS DA311 3-axis 12-bit digital accelerometer

national,lm63		Temperature sensor with integrated fan control

national,lm75		I2C TEMP SENSOR

drivers/iio/accel/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -52,6 +52,16 @@ config BMC150_ACCEL_SPI 
	tristate

	select REGMAP_SPI



config DA280

	tristate "MiraMEMS DA280 3-axis 14-bit digital accelerometer driver"

	depends on I2C

	help

	  Say yes here to build support for the MiraMEMS DA280 3-axis 14-bit

	  digital accelerometer.



	  To compile this driver as a module, choose M here: the

	  module will be called da280.



config DA311

	tristate "MiraMEMS DA311 3-axis 12-bit digital accelerometer driver"

	depends on I2C

drivers/iio/accel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ obj-$(CONFIG_BMA220) += bma220_spi.o 
obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o

obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o

obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o

obj-$(CONFIG_DA280)	+= da280.o

obj-$(CONFIG_DA311)	+= da311.o

obj-$(CONFIG_DMARD06)	+= dmard06.o

obj-$(CONFIG_DMARD09)	+= dmard09.o

drivers/iio/accel/da280.c

0 → 100644
+183 −0
Original line number Diff line number Diff line 
/**

 * IIO driver for the MiraMEMS DA280 3-axis accelerometer and

 * IIO driver for the MiraMEMS DA226 2-axis accelerometer

 *

 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 */



#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/byteorder/generic.h>



#define DA280_REG_CHIP_ID		0x01

#define DA280_REG_ACC_X_LSB		0x02

#define DA280_REG_ACC_Y_LSB		0x04

#define DA280_REG_ACC_Z_LSB		0x06

#define DA280_REG_MODE_BW		0x11



#define DA280_CHIP_ID			0x13

#define DA280_MODE_ENABLE		0x1e

#define DA280_MODE_DISABLE		0x9e



enum { da226, da280 };



/*

 * a value of + or -4096 corresponds to + or - 1G

 * scale = 9.81 / 4096 = 0.002395019

 */



static const int da280_nscale = 2395019;



#define DA280_CHANNEL(reg, axis) {	\

	.type = IIO_ACCEL,	\

	.address = reg,	\

	.modified = 1,	\

	.channel2 = IIO_MOD_##axis,	\

	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\

	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\

}



static const struct iio_chan_spec da280_channels[] = {

	DA280_CHANNEL(DA280_REG_ACC_X_LSB, X),

	DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y),

	DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z),

};



struct da280_data {

	struct i2c_client *client;

};



static int da280_enable(struct i2c_client *client, bool enable)

{

	u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE;



	return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data);

}



static int da280_read_raw(struct iio_dev *indio_dev,

				struct iio_chan_spec const *chan,

				int *val, int *val2, long mask)

{

	struct da280_data *data = iio_priv(indio_dev);

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		ret = i2c_smbus_read_word_data(data->client, chan->address);

		if (ret < 0)

			return ret;

		/*

		 * Values are 14 bits, stored as 16 bits with the 2

		 * least significant bits always 0.

		 */

		*val = (short)ret >> 2;

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:

		*val = 0;

		*val2 = da280_nscale;

		return IIO_VAL_INT_PLUS_NANO;

	default:

		return -EINVAL;

	}

}



static const struct iio_info da280_info = {

	.driver_module	= THIS_MODULE,

	.read_raw	= da280_read_raw,

};



static int da280_probe(struct i2c_client *client,

			const struct i2c_device_id *id)

{

	int ret;

	struct iio_dev *indio_dev;

	struct da280_data *data;



	ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID);

	if (ret != DA280_CHIP_ID)

		return (ret < 0) ? ret : -ENODEV;



	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));

	if (!indio_dev)

		return -ENOMEM;



	data = iio_priv(indio_dev);

	data->client = client;

	i2c_set_clientdata(client, indio_dev);



	indio_dev->dev.parent = &client->dev;

	indio_dev->info = &da280_info;

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = da280_channels;

	if (id->driver_data == da226) {

		indio_dev->name = "da226";

		indio_dev->num_channels = 2;

	} else {

		indio_dev->name = "da280";

		indio_dev->num_channels = 3;

	}



	ret = da280_enable(client, true);

	if (ret < 0)

		return ret;



	ret = iio_device_register(indio_dev);

	if (ret < 0) {

		dev_err(&client->dev, "device_register failed\n");

		da280_enable(client, false);

	}



	return ret;

}



static int da280_remove(struct i2c_client *client)

{

	struct iio_dev *indio_dev = i2c_get_clientdata(client);



	iio_device_unregister(indio_dev);



	return da280_enable(client, false);

}



#ifdef CONFIG_PM_SLEEP

static int da280_suspend(struct device *dev)

{

	return da280_enable(to_i2c_client(dev), false);

}



static int da280_resume(struct device *dev)

{

	return da280_enable(to_i2c_client(dev), true);

}

#endif



static SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);



static const struct i2c_device_id da280_i2c_id[] = {

	{ "da226", da226 },

	{ "da280", da280 },

	{}

};

MODULE_DEVICE_TABLE(i2c, da280_i2c_id);



static struct i2c_driver da280_driver = {

	.driver = {

		.name = "da280",

		.pm = &da280_pm_ops,

	},

	.probe		= da280_probe,

	.remove		= da280_remove,

	.id_table	= da280_i2c_id,

};



module_i2c_driver(da280_driver);



MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");

MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver");

MODULE_LICENSE("GPL v2");