iio: accel: Add driver for dmard10 3-axis Accelerometer (569906e2) · Commits · e / devices / android_kernel_fairphone_FP4

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

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Original line number	Diff line number	Diff line
		@@ -39,6 +39,7 @@ dallas,ds75 Digital Thermometer and Thermostat
		dlg,da9053 DA9053: flexible system level PMIC with multicore support
		dlg,da9063 DA9063: system PMIC for quad-core application processors
		domintech,dmard09 DMARD09: 3-axis Accelerometer
		domintech,dmard10 DMARD10: 3-axis Accelerometer
		epson,rx8010 I2C-BUS INTERFACE REAL TIME CLOCK MODULE
		epson,rx8025 High-Stability. I2C-Bus INTERFACE REAL TIME CLOCK MODULE
		epson,rx8581 I2C-BUS INTERFACE REAL TIME CLOCK MODULE

drivers/iio/accel/Kconfig

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		@@ -73,6 +73,16 @@ config DMARD09
		Choosing M will build the driver as a module. If so, the module
		will be called dmard09.

		config DMARD10
		tristate "Domintech DMARD10 3-axis Accelerometer Driver"
		depends on I2C
		help
		Say yes here to get support for the Domintech DMARD10 3-axis
		accelerometer.

		Choosing M will build the driver as a module. If so, the module
		will be called dmard10.

		config HID_SENSOR_ACCEL_3D
		depends on HID_SENSOR_HUB
		select IIO_BUFFER

drivers/iio/accel/Makefile

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		@@ -10,6 +10,7 @@ obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
		obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
		obj-$(CONFIG_DMARD06) += dmard06.o
		obj-$(CONFIG_DMARD09) += dmard09.o
		obj-$(CONFIG_DMARD10) += dmard10.o
		obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
		obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
		obj-$(CONFIG_KXSD9) += kxsd9.o

drivers/iio/accel/dmard10.c

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		/**
		* IIO driver for the 3-axis accelerometer Domintech ARD10.
		*
		* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
		* Copyright (c) 2012 Domintech 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 DMARD10_REG_ACTR 0x00
		#define DMARD10_REG_AFEM 0x0c
		#define DMARD10_REG_STADR 0x12
		#define DMARD10_REG_STAINT 0x1c
		#define DMARD10_REG_MISC2 0x1f
		#define DMARD10_REG_PD 0x21

		#define DMARD10_MODE_OFF 0x00
		#define DMARD10_MODE_STANDBY 0x02
		#define DMARD10_MODE_ACTIVE 0x06
		#define DMARD10_MODE_READ_OTP 0x12
		#define DMARD10_MODE_RESET_DATA_PATH 0x82

		/* AFEN set 1, ATM[2:0]=b'000 (normal), EN_Z/Y/X/T=1 */
		#define DMARD10_VALUE_AFEM_AFEN_NORMAL 0x8f
		/* ODR[3:0]=b'0111 (100Hz), CCK[3:0]=b'0100 (204.8kHZ) */
		#define DMARD10_VALUE_CKSEL_ODR_100_204 0x74
		/* INTC[6:5]=b'00 */
		#define DMARD10_VALUE_INTC 0x00
		/* TAP1/TAP2 Average 2 */
		#define DMARD10_VALUE_TAPNS_AVE_2 0x11

		#define DMARD10_VALUE_STADR 0x55
		#define DMARD10_VALUE_STAINT 0xaa
		#define DMARD10_VALUE_MISC2_OSCA_EN 0x08
		#define DMARD10_VALUE_PD_RST 0x52

		/* Offsets into the buffer read in dmard10_read_raw() */
		#define DMARD10_X_OFFSET 1
		#define DMARD10_Y_OFFSET 2
		#define DMARD10_Z_OFFSET 3

		/*
		* a value of + or -128 corresponds to + or - 1G
		* scale = 9.81 / 128 = 0.076640625
		*/

		static const int dmard10_nscale = 76640625;

		#define DMARD10_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 dmard10_channels[] = {
		DMARD10_CHANNEL(DMARD10_X_OFFSET, X),
		DMARD10_CHANNEL(DMARD10_Y_OFFSET, Y),
		DMARD10_CHANNEL(DMARD10_Z_OFFSET, Z),
		};

		struct dmard10_data {
		struct i2c_client *client;
		};

		/* Init sequence taken from the android driver */
		static int dmard10_reset(struct i2c_client *client)
		{
		unsigned char buffer[7];
		int ret;

		/* 1. Powerdown reset */
		ret = i2c_smbus_write_byte_data(client, DMARD10_REG_PD,
		DMARD10_VALUE_PD_RST);
		if (ret < 0)
		return ret;

		/*
		* 2. ACTR => Standby mode => Download OTP to parameter reg =>
		* Standby mode => Reset data path => Standby mode
		*/
		buffer[0] = DMARD10_REG_ACTR;
		buffer[1] = DMARD10_MODE_STANDBY;
		buffer[2] = DMARD10_MODE_READ_OTP;
		buffer[3] = DMARD10_MODE_STANDBY;
		buffer[4] = DMARD10_MODE_RESET_DATA_PATH;
		buffer[5] = DMARD10_MODE_STANDBY;
		ret = i2c_master_send(client, buffer, 6);
		if (ret < 0)
		return ret;

		/* 3. OSCA_EN = 1, TSTO = b'000 (INT1 = normal, TEST0 = normal) */
		ret = i2c_smbus_write_byte_data(client, DMARD10_REG_MISC2,
		DMARD10_VALUE_MISC2_OSCA_EN);
		if (ret < 0)
		return ret;

		/* 4. AFEN = 1 (AFE will powerdown after ADC) */
		buffer[0] = DMARD10_REG_AFEM;
		buffer[1] = DMARD10_VALUE_AFEM_AFEN_NORMAL;
		buffer[2] = DMARD10_VALUE_CKSEL_ODR_100_204;
		buffer[3] = DMARD10_VALUE_INTC;
		buffer[4] = DMARD10_VALUE_TAPNS_AVE_2;
		buffer[5] = 0x00; /* DLYC, no delay timing */
		buffer[6] = 0x07; /* INTD=1 push-pull, INTA=1 active high, AUTOT=1 */
		ret = i2c_master_send(client, buffer, 7);
		if (ret < 0)
		return ret;

		/* 5. Activation mode */
		ret = i2c_smbus_write_byte_data(client, DMARD10_REG_ACTR,
		DMARD10_MODE_ACTIVE);
		if (ret < 0)
		return ret;

		return 0;
		}

		/* Shutdown sequence taken from the android driver */
		static int dmard10_shutdown(struct i2c_client *client)
		{
		unsigned char buffer[3];

		buffer[0] = DMARD10_REG_ACTR;
		buffer[1] = DMARD10_MODE_STANDBY;
		buffer[2] = DMARD10_MODE_OFF;

		return i2c_master_send(client, buffer, 3);
		}

		static int dmard10_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct dmard10_data *data = iio_priv(indio_dev);
		__le16 buf[4];
		int ret;

		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		/*
		* Read 8 bytes starting at the REG_STADR register, trying to
		* read the individual X, Y, Z registers will always read 0.
		*/
		ret = i2c_smbus_read_i2c_block_data(data->client,
		DMARD10_REG_STADR,
		sizeof(buf), (u8 *)buf);
		if (ret < 0)
		return ret;
		ret = le16_to_cpu(buf[chan->address]);
		*val = sign_extend32(ret, 12);
		return IIO_VAL_INT;
		case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = dmard10_nscale;
		return IIO_VAL_INT_PLUS_NANO;
		default:
		return -EINVAL;
		}
		}

		static const struct iio_info dmard10_info = {
		.driver_module = THIS_MODULE,
		.read_raw = dmard10_read_raw,
		};

		static int dmard10_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int ret;
		struct iio_dev *indio_dev;
		struct dmard10_data *data;

		/* These 2 registers have special POR reset values used for id */
		ret = i2c_smbus_read_byte_data(client, DMARD10_REG_STADR);
		if (ret != DMARD10_VALUE_STADR)
		return (ret < 0) ? ret : -ENODEV;

		ret = i2c_smbus_read_byte_data(client, DMARD10_REG_STAINT);
		if (ret != DMARD10_VALUE_STAINT)
		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 = &dmard10_info;
		indio_dev->name = "dmard10";
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->channels = dmard10_channels;
		indio_dev->num_channels = ARRAY_SIZE(dmard10_channels);

		ret = dmard10_reset(client);
		if (ret < 0)
		return ret;

		ret = iio_device_register(indio_dev);
		if (ret < 0) {
		dev_err(&client->dev, "device_register failed\n");
		dmard10_shutdown(client);
		}

		return ret;
		}

		static int dmard10_remove(struct i2c_client *client)
		{
		struct iio_dev *indio_dev = i2c_get_clientdata(client);

		iio_device_unregister(indio_dev);

		return dmard10_shutdown(client);
		}

		#ifdef CONFIG_PM_SLEEP
		static int dmard10_suspend(struct device *dev)
		{
		return dmard10_shutdown(to_i2c_client(dev));
		}

		static int dmard10_resume(struct device *dev)
		{
		return dmard10_reset(to_i2c_client(dev));
		}
		#endif

		static SIMPLE_DEV_PM_OPS(dmard10_pm_ops, dmard10_suspend, dmard10_resume);

		static const struct i2c_device_id dmard10_i2c_id[] = {
		{"dmard10", 0},
		{}
		};
		MODULE_DEVICE_TABLE(i2c, dmard10_i2c_id);

		static struct i2c_driver dmard10_driver = {
		.driver = {
		.name = "dmard10",
		.pm = &dmard10_pm_ops,
		},
		.probe = dmard10_probe,
		.remove = dmard10_remove,
		.id_table = dmard10_i2c_id,
		};

		module_i2c_driver(dmard10_driver);

		MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
		MODULE_DESCRIPTION("Domintech ARD10 3-Axis Accelerometer driver");
		MODULE_LICENSE("GPL v2");