iio: accel: Add driver for the MiraMEMS DA280 3-axis 14-bit digital accelerometer (f225951d) · Commits · 戴 / test

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

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		@@ -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

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		@@ -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");

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