iio: accel: Add driver for the MiraMEMS DA311 3-axis 12-bit digital accelerometer (598893e9) · Commits · 戴 / test

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

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Original line number	Diff line number	Diff line
		@@ -125,6 +125,7 @@ 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,da311 MiraMEMS DA311 3-axis 12-bit digital accelerometer
		national,lm63 Temperature sensor with integrated fan control
		national,lm75 I2C TEMP SENSOR
		national,lm80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor

drivers/iio/accel/Kconfig

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		@@ -52,6 +52,16 @@ config BMC150_ACCEL_SPI
		tristate
		select REGMAP_SPI

		config DA311
		tristate "MiraMEMS DA311 3-axis 12-bit digital accelerometer driver"
		depends on I2C
		help
		Say yes here to build support for the MiraMEMS DA311 3-axis 12-bit
		digital accelerometer.

		To compile this driver as a module, choose M here: the
		module will be called da311.

		config DMARD06
		tristate "Domintech DMARD06 Digital Accelerometer Driver"
		depends on OF \|\| COMPILE_TEST

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-$(CONFIG_DA311) += da311.o
		obj-$(CONFIG_DMARD06) += dmard06.o
		obj-$(CONFIG_DMARD09) += dmard09.o
		obj-$(CONFIG_DMARD10) += dmard10.o

drivers/iio/accel/da311.c

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+305 −0

Original line number	Diff line number	Diff line
		/**
		* IIO driver for the MiraMEMS DA311 3-axis accelerometer
		*
		* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
		* Copyright (c) 2011-2013 MiraMEMS Sensing Technology Co., Ltd.
		*
		* 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 DA311_CHIP_ID 0x13

		/*
		* Note register addressed go from 0 - 0x3f and then wrap.
		* For some reason there are 2 banks with 0 - 0x3f addresses,
		* rather then a single 0-0x7f bank.
		*/

		/* Bank 0 regs */
		#define DA311_REG_BANK 0x0000
		#define DA311_REG_LDO_REG 0x0006
		#define DA311_REG_CHIP_ID 0x000f
		#define DA311_REG_TEMP_CFG_REG 0x001f
		#define DA311_REG_CTRL_REG1 0x0020
		#define DA311_REG_CTRL_REG3 0x0022
		#define DA311_REG_CTRL_REG4 0x0023
		#define DA311_REG_CTRL_REG5 0x0024
		#define DA311_REG_CTRL_REG6 0x0025
		#define DA311_REG_STATUS_REG 0x0027
		#define DA311_REG_OUT_X_L 0x0028
		#define DA311_REG_OUT_X_H 0x0029
		#define DA311_REG_OUT_Y_L 0x002a
		#define DA311_REG_OUT_Y_H 0x002b
		#define DA311_REG_OUT_Z_L 0x002c
		#define DA311_REG_OUT_Z_H 0x002d
		#define DA311_REG_INT1_CFG 0x0030
		#define DA311_REG_INT1_SRC 0x0031
		#define DA311_REG_INT1_THS 0x0032
		#define DA311_REG_INT1_DURATION 0x0033
		#define DA311_REG_INT2_CFG 0x0034
		#define DA311_REG_INT2_SRC 0x0035
		#define DA311_REG_INT2_THS 0x0036
		#define DA311_REG_INT2_DURATION 0x0037
		#define DA311_REG_CLICK_CFG 0x0038
		#define DA311_REG_CLICK_SRC 0x0039
		#define DA311_REG_CLICK_THS 0x003a
		#define DA311_REG_TIME_LIMIT 0x003b
		#define DA311_REG_TIME_LATENCY 0x003c
		#define DA311_REG_TIME_WINDOW 0x003d

		/* Bank 1 regs */
		#define DA311_REG_SOFT_RESET 0x0105
		#define DA311_REG_OTP_XOFF_L 0x0110
		#define DA311_REG_OTP_XOFF_H 0x0111
		#define DA311_REG_OTP_YOFF_L 0x0112
		#define DA311_REG_OTP_YOFF_H 0x0113
		#define DA311_REG_OTP_ZOFF_L 0x0114
		#define DA311_REG_OTP_ZOFF_H 0x0115
		#define DA311_REG_OTP_XSO 0x0116
		#define DA311_REG_OTP_YSO 0x0117
		#define DA311_REG_OTP_ZSO 0x0118
		#define DA311_REG_OTP_TRIM_OSC 0x011b
		#define DA311_REG_LPF_ABSOLUTE 0x011c
		#define DA311_REG_TEMP_OFF1 0x0127
		#define DA311_REG_TEMP_OFF2 0x0128
		#define DA311_REG_TEMP_OFF3 0x0129
		#define DA311_REG_OTP_TRIM_THERM_H 0x011a

		/*
		* a value of + or -1024 corresponds to + or - 1G
		* scale = 9.81 / 1024 = 0.009580078
		*/

		static const int da311_nscale = 9580078;

		#define DA311_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 da311_channels[] = {
		/* \| 0x80 comes from the android driver */
		DA311_CHANNEL(DA311_REG_OUT_X_L \| 0x80, X),
		DA311_CHANNEL(DA311_REG_OUT_Y_L \| 0x80, Y),
		DA311_CHANNEL(DA311_REG_OUT_Z_L \| 0x80, Z),
		};

		struct da311_data {
		struct i2c_client *client;
		};

		static int da311_register_mask_write(struct i2c_client *client, u16 addr,
		u8 mask, u8 data)
		{
		int ret;
		u8 tmp_data = 0;

		if (addr & 0xff00) {
		/* Select bank 1 */
		ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x01);
		if (ret < 0)
		return ret;
		}

		if (mask != 0xff) {
		ret = i2c_smbus_read_byte_data(client, addr);
		if (ret < 0)
		return ret;
		tmp_data = ret;
		}

		tmp_data &= ~mask;
		tmp_data \|= data & mask;
		ret = i2c_smbus_write_byte_data(client, addr & 0xff, tmp_data);
		if (ret < 0)
		return ret;

		if (addr & 0xff00) {
		/* Back to bank 0 */
		ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x00);
		if (ret < 0)
		return ret;
		}

		return 0;
		}

		/* Init sequence taken from the android driver */
		static int da311_reset(struct i2c_client *client)
		{
		const struct {
		u16 addr;
		u8 mask;
		u8 data;
		} init_data[] = {
		{ DA311_REG_TEMP_CFG_REG, 0xff, 0x08 },
		{ DA311_REG_CTRL_REG5, 0xff, 0x80 },
		{ DA311_REG_CTRL_REG4, 0x30, 0x00 },
		{ DA311_REG_CTRL_REG1, 0xff, 0x6f },
		{ DA311_REG_TEMP_CFG_REG, 0xff, 0x88 },
		{ DA311_REG_LDO_REG, 0xff, 0x02 },
		{ DA311_REG_OTP_TRIM_OSC, 0xff, 0x27 },
		{ DA311_REG_LPF_ABSOLUTE, 0xff, 0x30 },
		{ DA311_REG_TEMP_OFF1, 0xff, 0x3f },
		{ DA311_REG_TEMP_OFF2, 0xff, 0xff },
		{ DA311_REG_TEMP_OFF3, 0xff, 0x0f },
		};
		int i, ret;

		/* Reset */
		ret = da311_register_mask_write(client, DA311_REG_SOFT_RESET,
		0xff, 0xaa);
		if (ret < 0)
		return ret;

		for (i = 0; i < ARRAY_SIZE(init_data); i++) {
		ret = da311_register_mask_write(client,
		init_data[i].addr,
		init_data[i].mask,
		init_data[i].data);
		if (ret < 0)
		return ret;
		}

		return 0;
		}

		static int da311_enable(struct i2c_client *client, bool enable)
		{
		u8 data = enable ? 0x00 : 0x20;

		return da311_register_mask_write(client, DA311_REG_TEMP_CFG_REG,
		0x20, data);
		}

		static int da311_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct da311_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 12 bits, stored as 16 bits with the 4
		* least significant bits always 0.
		*/
		*val = (short)ret >> 4;
		return IIO_VAL_INT;
		case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = da311_nscale;
		return IIO_VAL_INT_PLUS_NANO;
		default:
		return -EINVAL;
		}
		}

		static const struct iio_info da311_info = {
		.driver_module = THIS_MODULE,
		.read_raw = da311_read_raw,
		};

		static int da311_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int ret;
		struct iio_dev *indio_dev;
		struct da311_data *data;

		ret = i2c_smbus_read_byte_data(client, DA311_REG_CHIP_ID);
		if (ret != DA311_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 = &da311_info;
		indio_dev->name = "da311";
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->channels = da311_channels;
		indio_dev->num_channels = ARRAY_SIZE(da311_channels);

		ret = da311_reset(client);
		if (ret < 0)
		return ret;

		ret = da311_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");
		da311_enable(client, false);
		}

		return ret;
		}

		static int da311_remove(struct i2c_client *client)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(client);

		iio_device_unregister(indio_dev);

		return da311_enable(client, false);
		}

		#ifdef CONFIG_PM_SLEEP
		static int da311_suspend(struct device *dev)
		{
		return da311_enable(to_i2c_client(dev), false);
		}

		static int da311_resume(struct device *dev)
		{
		return da311_enable(to_i2c_client(dev), true);
		}
		#endif

		static SIMPLE_DEV_PM_OPS(da311_pm_ops, da311_suspend, da311_resume);

		static const struct i2c_device_id da311_i2c_id[] = {
		{"da311", 0},
		{}
		};
		MODULE_DEVICE_TABLE(i2c, da311_i2c_id);

		static struct i2c_driver da311_driver = {
		.driver = {
		.name = "da311",
		.pm = &da311_pm_ops,
		},
		.probe = da311_probe,
		.remove = da311_remove,
		.id_table = da311_i2c_id,
		};

		module_i2c_driver(da311_driver);

		MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
		MODULE_DESCRIPTION("MiraMEMS DA311 3-Axis Accelerometer driver");
		MODULE_LICENSE("GPL v2");

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