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: Hans de Goede <hdegoede@redhat.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Hans de Goede
Jonathan Cameron
parent
a13e831fca
commit
f225951dbb
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@ -125,6 +125,8 @@ microchip,mcp4662-502 Microchip 8-bit Dual I2C Digital Potentiometer with NV Mem
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microchip,mcp4662-103 Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (10k)
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microchip,mcp4662-503 Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (50k)
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microchip,mcp4662-104 Microchip 8-bit Dual I2C Digital Potentiometer with NV Memory (100k)
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miramems,da226 MiraMEMS DA226 2-axis 14-bit digital accelerometer
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miramems,da280 MiraMEMS DA280 3-axis 14-bit digital accelerometer
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miramems,da311 MiraMEMS DA311 3-axis 12-bit digital accelerometer
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national,lm63 Temperature sensor with integrated fan control
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national,lm75 I2C TEMP SENSOR
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@ -52,6 +52,16 @@ config BMC150_ACCEL_SPI
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tristate
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select REGMAP_SPI
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config DA280
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tristate "MiraMEMS DA280 3-axis 14-bit digital accelerometer driver"
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depends on I2C
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help
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Say yes here to build support for the MiraMEMS DA280 3-axis 14-bit
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digital accelerometer.
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To compile this driver as a module, choose M here: the
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module will be called da280.
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config DA311
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tristate "MiraMEMS DA311 3-axis 12-bit digital accelerometer driver"
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depends on I2C
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@ -8,6 +8,7 @@ obj-$(CONFIG_BMA220) += bma220_spi.o
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obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
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obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
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obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
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obj-$(CONFIG_DA280) += da280.o
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obj-$(CONFIG_DA311) += da311.o
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obj-$(CONFIG_DMARD06) += dmard06.o
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obj-$(CONFIG_DMARD09) += dmard09.o
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@ -0,0 +1,183 @@
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/**
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* IIO driver for the MiraMEMS DA280 3-axis accelerometer and
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* IIO driver for the MiraMEMS DA226 2-axis accelerometer
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*
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* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/byteorder/generic.h>
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#define DA280_REG_CHIP_ID 0x01
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#define DA280_REG_ACC_X_LSB 0x02
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#define DA280_REG_ACC_Y_LSB 0x04
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#define DA280_REG_ACC_Z_LSB 0x06
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#define DA280_REG_MODE_BW 0x11
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#define DA280_CHIP_ID 0x13
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#define DA280_MODE_ENABLE 0x1e
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#define DA280_MODE_DISABLE 0x9e
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enum { da226, da280 };
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/*
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* a value of + or -4096 corresponds to + or - 1G
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* scale = 9.81 / 4096 = 0.002395019
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*/
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static const int da280_nscale = 2395019;
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#define DA280_CHANNEL(reg, axis) { \
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.type = IIO_ACCEL, \
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.address = reg, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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}
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static const struct iio_chan_spec da280_channels[] = {
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DA280_CHANNEL(DA280_REG_ACC_X_LSB, X),
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DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y),
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DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z),
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};
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struct da280_data {
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struct i2c_client *client;
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};
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static int da280_enable(struct i2c_client *client, bool enable)
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{
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u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE;
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return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data);
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}
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static int da280_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct da280_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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if (ret < 0)
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return ret;
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/*
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* Values are 14 bits, stored as 16 bits with the 2
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* least significant bits always 0.
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*/
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*val = (short)ret >> 2;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = da280_nscale;
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return IIO_VAL_INT_PLUS_NANO;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info da280_info = {
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.driver_module = THIS_MODULE,
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.read_raw = da280_read_raw,
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};
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static int da280_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct da280_data *data;
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ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID);
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if (ret != DA280_CHIP_ID)
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return (ret < 0) ? ret : -ENODEV;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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data->client = client;
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i2c_set_clientdata(client, indio_dev);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &da280_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = da280_channels;
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if (id->driver_data == da226) {
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indio_dev->name = "da226";
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indio_dev->num_channels = 2;
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} else {
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indio_dev->name = "da280";
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indio_dev->num_channels = 3;
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}
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ret = da280_enable(client, true);
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if (ret < 0)
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return ret;
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev, "device_register failed\n");
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da280_enable(client, false);
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}
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return ret;
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}
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static int da280_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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iio_device_unregister(indio_dev);
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return da280_enable(client, false);
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}
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#ifdef CONFIG_PM_SLEEP
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static int da280_suspend(struct device *dev)
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{
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return da280_enable(to_i2c_client(dev), false);
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}
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static int da280_resume(struct device *dev)
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{
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return da280_enable(to_i2c_client(dev), true);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);
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static const struct i2c_device_id da280_i2c_id[] = {
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{ "da226", da226 },
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{ "da280", da280 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, da280_i2c_id);
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static struct i2c_driver da280_driver = {
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.driver = {
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.name = "da280",
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.pm = &da280_pm_ops,
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},
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.probe = da280_probe,
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.remove = da280_remove,
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.id_table = da280_i2c_id,
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};
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module_i2c_driver(da280_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver");
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MODULE_LICENSE("GPL v2");
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