Commit 063e3303 authored by Hans de Goede's avatar Hans de Goede Committed by Jonathan Cameron
Browse files

iio: accel: Add driver for the mCube MC3230 3-axis accelerometer 

Add an IIO driver for the mCube MC3230 3-axis accelerometer.

A datasheet for the mCube MC3230 can be found here:
http://www.mcubemems.com/wp-content/uploads/2014/10/MC3230_2-Datasheet-APS-048-0007v1.6.pdf



Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 56203188

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

+1 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ maxim,ds1050 5 Bit Programmable, Pulse-Width Modulator 
maxim,max1237		Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs

maxim,max6625		9-Bit/12-Bit Temperature Sensors with I²C-Compatible Serial Interface

mc,rv3029c2		Real Time Clock Module with I2C-Bus

mcube,mc3230		mCube 3-axis 8-bit digital accelerometer

microchip,mcp4531-502	Microchip 7-bit Single I2C Digital Potentiometer (5k)

microchip,mcp4531-103	Microchip 7-bit Single I2C Digital Potentiometer (10k)

microchip,mcp4531-503	Microchip 7-bit Single I2C Digital Potentiometer (50k)

drivers/iio/accel/Kconfig

+10 −0
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@@ -161,6 +161,16 @@ config KXCJK1013 
	  To compile this driver as a module, choose M here: the module will

	  be called kxcjk-1013.



config MC3230

	tristate "mCube MC3230 Digital Accelerometer Driver"

	depends on I2C

	help

	  Say yes here to build support for the mCube MC3230 low-g tri-axial

	  digital accelerometer.



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

	  module will be called mc3230.



config MMA7455

	tristate

	select IIO_BUFFER

drivers/iio/accel/Makefile

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@@ -15,6 +15,7 @@ obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o 
obj-$(CONFIG_KXSD9)	+= kxsd9.o

obj-$(CONFIG_KXSD9_SPI)	+= kxsd9-spi.o

obj-$(CONFIG_KXSD9_I2C)	+= kxsd9-i2c.o

obj-$(CONFIG_MC3230)	+= mc3230.o



obj-$(CONFIG_MMA7455)		+= mma7455_core.o

obj-$(CONFIG_MMA7455_I2C)	+= mma7455_i2c.o

drivers/iio/accel/mc3230.c

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/**

 * mCube MC3230 3-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 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.

 *

 * IIO driver for mCube MC3230; 7-bit I2C address: 0x4c.

 */



#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>



#define MC3230_REG_XOUT			0x00

#define MC3230_REG_YOUT			0x01

#define MC3230_REG_ZOUT			0x02



#define MC3230_REG_MODE			0x07

#define MC3230_MODE_OPCON_MASK		0x03

#define MC3230_MODE_OPCON_WAKE		0x01

#define MC3230_MODE_OPCON_STANDBY	0x03



#define MC3230_REG_CHIP_ID		0x18

#define MC3230_CHIP_ID			0x01



#define MC3230_REG_PRODUCT_CODE		0x3b

#define MC3230_PRODUCT_CODE		0x19



/*

 * The accelerometer has one measurement range:

 *

 * -1.5g - +1.5g (8-bit, signed)

 *

 * scale = (1.5 + 1.5) * 9.81 / (2^8 - 1)	= 0.115411765

 */



static const int mc3230_nscale = 115411765;



#define MC3230_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 mc3230_channels[] = {

	MC3230_CHANNEL(MC3230_REG_XOUT, X),

	MC3230_CHANNEL(MC3230_REG_YOUT, Y),

	MC3230_CHANNEL(MC3230_REG_ZOUT, Z),

};



struct mc3230_data {

	struct i2c_client *client;

};



static int mc3230_set_opcon(struct mc3230_data *data, int opcon)

{

	int ret;

	struct i2c_client *client = data->client;



	ret = i2c_smbus_read_byte_data(client, MC3230_REG_MODE);

	if (ret < 0) {

		dev_err(&client->dev, "failed to read mode reg: %d\n", ret);

		return ret;

	}



	ret &= ~MC3230_MODE_OPCON_MASK;

	ret |= opcon;



	ret = i2c_smbus_write_byte_data(client, MC3230_REG_MODE, ret);

	if (ret < 0) {

		dev_err(&client->dev, "failed to write mode reg: %d\n", ret);

		return ret;

	}



	return 0;

}



static int mc3230_read_raw(struct iio_dev *indio_dev,

				struct iio_chan_spec const *chan,

				int *val, int *val2, long mask)

{

	struct mc3230_data *data = iio_priv(indio_dev);

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		ret = i2c_smbus_read_byte_data(data->client, chan->address);

		if (ret < 0)

			return ret;

		*val = sign_extend32(ret, 7);

		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:

		*val = 0;

		*val2 = mc3230_nscale;

		return IIO_VAL_INT_PLUS_NANO;

	default:

		return -EINVAL;

	}

}



static const struct iio_info mc3230_info = {

	.driver_module	= THIS_MODULE,

	.read_raw	= mc3230_read_raw,

};



static int mc3230_probe(struct i2c_client *client,

			const struct i2c_device_id *id)

{

	int ret;

	struct iio_dev *indio_dev;

	struct mc3230_data *data;



	/* First check chip-id and product-id */

	ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID);

	if (ret != MC3230_CHIP_ID)

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



	ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE);

	if (ret != MC3230_PRODUCT_CODE)

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



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

	if (!indio_dev) {

		dev_err(&client->dev, "iio allocation failed!\n");

		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 = &mc3230_info;

	indio_dev->name = "mc3230";

	indio_dev->modes = INDIO_DIRECT_MODE;

	indio_dev->channels = mc3230_channels;

	indio_dev->num_channels = ARRAY_SIZE(mc3230_channels);



	ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);

	if (ret < 0)

		return ret;



	ret = iio_device_register(indio_dev);

	if (ret < 0) {

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

		mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);

	}



	return ret;

}



static int mc3230_remove(struct i2c_client *client)

{

	struct iio_dev *indio_dev = i2c_get_clientdata(client);



	iio_device_unregister(indio_dev);



	return mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY);

}



#ifdef CONFIG_PM_SLEEP

static int mc3230_suspend(struct device *dev)

{

	struct mc3230_data *data;



	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));



	return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);

}



static int mc3230_resume(struct device *dev)

{

	struct mc3230_data *data;



	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));



	return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);

}

#endif



static SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume);



static const struct i2c_device_id mc3230_i2c_id[] = {

	{"mc3230", 0},

	{}

};

MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id);



static struct i2c_driver mc3230_driver = {

	.driver = {

		.name = "mc3230",

		.pm = &mc3230_pm_ops,

	},

	.probe		= mc3230_probe,

	.remove		= mc3230_remove,

	.id_table	= mc3230_i2c_id,

};



module_i2c_driver(mc3230_driver);



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

MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver");

MODULE_LICENSE("GPL v2");

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