iio: accel: add Freescale MMA7455L/MMA7456L 3-axis accelerometer driver (a84ef0d1) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/iio/accel/Kconfig

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		@@ -107,6 +107,35 @@ config KXCJK1013
		To compile this driver as a module, choose M here: the module will
		be called kxcjk-1013.

		config MMA7455
		tristate
		select IIO_BUFFER
		select IIO_TRIGGERED_BUFFER

		config MMA7455_I2C
		tristate "Freescale MMA7455L/MMA7456L Accelerometer I2C Driver"
		depends on I2C
		select MMA7455
		select REGMAP_I2C
		help
		Say yes here to build support for the Freescale MMA7455L and
		MMA7456L 3-axis accelerometer.

		To compile this driver as a module, choose M here: the module
		will be called mma7455_i2c.

		config MMA7455_SPI
		tristate "Freescale MMA7455L/MMA7456L Accelerometer SPI Driver"
		depends on SPI_MASTER
		select MMA7455
		select REGMAP_SPI
		help
		Say yes here to build support for the Freescale MMA7455L and
		MMA7456L 3-axis accelerometer.

		To compile this driver as a module, choose M here: the module
		will be called mma7455_spi.

		config MMA8452
		tristate "Freescale MMA8452Q and similar Accelerometers Driver"
		depends on I2C

drivers/iio/accel/Makefile

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		@@ -10,6 +10,11 @@ obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
		obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
		obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
		obj-$(CONFIG_KXSD9) += kxsd9.o

		obj-$(CONFIG_MMA7455) += mma7455_core.o
		obj-$(CONFIG_MMA7455_I2C) += mma7455_i2c.o
		obj-$(CONFIG_MMA7455_SPI) += mma7455_spi.o

		obj-$(CONFIG_MMA8452) += mma8452.o

		obj-$(CONFIG_MMA9551_CORE) += mma9551_core.o

drivers/iio/accel/mma7455.h

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		/*
		* IIO accel driver for Freescale MMA7455L 3-axis 10-bit accelerometer
		* Copyright 2015 Joachim Eastwood <manabian@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#ifndef __MMA7455_H
		#define __MMA7455_H

		extern const struct regmap_config mma7455_core_regmap;

		int mma7455_core_probe(struct device dev, struct regmap regmap,
		const char *name);
		int mma7455_core_remove(struct device *dev);

		#endif

drivers/iio/accel/mma7455_core.c

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		/*
		* IIO accel core driver for Freescale MMA7455L 3-axis 10-bit accelerometer
		* Copyright 2015 Joachim Eastwood <manabian@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* UNSUPPORTED hardware features:
		* - 8-bit mode with different scales
		* - INT1/INT2 interrupts
		* - Offset calibration
		* - Events
		*/

		#include <linux/delay.h>
		#include <linux/iio/iio.h>
		#include <linux/iio/sysfs.h>
		#include <linux/iio/buffer.h>
		#include <linux/iio/trigger.h>
		#include <linux/iio/trigger_consumer.h>
		#include <linux/iio/triggered_buffer.h>
		#include <linux/module.h>
		#include <linux/regmap.h>

		#include "mma7455.h"

		#define MMA7455_REG_XOUTL 0x00
		#define MMA7455_REG_XOUTH 0x01
		#define MMA7455_REG_YOUTL 0x02
		#define MMA7455_REG_YOUTH 0x03
		#define MMA7455_REG_ZOUTL 0x04
		#define MMA7455_REG_ZOUTH 0x05
		#define MMA7455_REG_STATUS 0x09
		#define MMA7455_STATUS_DRDY BIT(0)
		#define MMA7455_REG_WHOAMI 0x0f
		#define MMA7455_WHOAMI_ID 0x55
		#define MMA7455_REG_MCTL 0x16
		#define MMA7455_MCTL_MODE_STANDBY 0x00
		#define MMA7455_MCTL_MODE_MEASURE 0x01
		#define MMA7455_REG_CTL1 0x18
		#define MMA7455_CTL1_DFBW_MASK BIT(7)
		#define MMA7455_CTL1_DFBW_125HZ BIT(7)
		#define MMA7455_CTL1_DFBW_62_5HZ 0
		#define MMA7455_REG_TW 0x1e

		/*
		* When MMA7455 is used in 10-bit it has a fullscale of -8g
		* corresponding to raw value -512. The userspace interface
		* uses m/s^2 and we declare micro units.
		* So scale factor is given by:
		* g * 8 * 1e6 / 512 = 153228.90625, with g = 9.80665
		*/
		#define MMA7455_10BIT_SCALE 153229

		struct mma7455_data {
		struct regmap *regmap;
		struct device *dev;
		};

		static int mma7455_drdy(struct mma7455_data *mma7455)
		{
		unsigned int reg;
		int tries = 3;
		int ret;

		while (tries-- > 0) {
		ret = regmap_read(mma7455->regmap, MMA7455_REG_STATUS, &reg);
		if (ret)
		return ret;

		if (reg & MMA7455_STATUS_DRDY)
		return 0;

		msleep(20);
		}

		dev_warn(mma7455->dev, "data not ready\n");

		return -EIO;
		}

		static irqreturn_t mma7455_trigger_handler(int irq, void *p)
		{
		struct iio_poll_func *pf = p;
		struct iio_dev *indio_dev = pf->indio_dev;
		struct mma7455_data *mma7455 = iio_priv(indio_dev);
		u8 buf[16]; /* 3 x 16-bit channels + padding + ts */
		int ret;

		ret = mma7455_drdy(mma7455);
		if (ret)
		goto done;

		ret = regmap_bulk_read(mma7455->regmap, MMA7455_REG_XOUTL, buf,
		sizeof(__le16) * 3);
		if (ret)
		goto done;

		iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());

		done:
		iio_trigger_notify_done(indio_dev->trig);

		return IRQ_HANDLED;
		}

		static int mma7455_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct mma7455_data *mma7455 = iio_priv(indio_dev);
		unsigned int reg;
		__le16 data;
		int ret;

		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		if (iio_buffer_enabled(indio_dev))
		return -EBUSY;

		ret = mma7455_drdy(mma7455);
		if (ret)
		return ret;

		ret = regmap_bulk_read(mma7455->regmap, chan->address, &data,
		sizeof(data));
		if (ret)
		return ret;

		*val = sign_extend32(le16_to_cpu(data), 9);

		return IIO_VAL_INT;

		case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = MMA7455_10BIT_SCALE;

		return IIO_VAL_INT_PLUS_MICRO;

		case IIO_CHAN_INFO_SAMP_FREQ:
		ret = regmap_read(mma7455->regmap, MMA7455_REG_CTL1, &reg);
		if (ret)
		return ret;

		if (reg & MMA7455_CTL1_DFBW_MASK)
		*val = 250;
		else
		*val = 125;

		return IIO_VAL_INT;
		}

		return -EINVAL;
		}

		static int mma7455_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		struct mma7455_data *mma7455 = iio_priv(indio_dev);
		int i;

		switch (mask) {
		case IIO_CHAN_INFO_SAMP_FREQ:
		if (val == 250 && val2 == 0)
		i = MMA7455_CTL1_DFBW_125HZ;
		else if (val == 125 && val2 == 0)
		i = MMA7455_CTL1_DFBW_62_5HZ;
		else
		return -EINVAL;

		return regmap_update_bits(mma7455->regmap, MMA7455_REG_CTL1,
		MMA7455_CTL1_DFBW_MASK, i);

		case IIO_CHAN_INFO_SCALE:
		/* In 10-bit mode there is only one scale available */
		if (val == 0 && val2 == MMA7455_10BIT_SCALE)
		return 0;
		break;
		}

		return -EINVAL;
		}

		static IIO_CONST_ATTR(sampling_frequency_available, "125 250");

		static struct attribute *mma7455_attributes[] = {
		&iio_const_attr_sampling_frequency_available.dev_attr.attr,
		NULL
		};

		static const struct attribute_group mma7455_group = {
		.attrs = mma7455_attributes,
		};

		static const struct iio_info mma7455_info = {
		.attrs = &mma7455_group,
		.read_raw = mma7455_read_raw,
		.write_raw = mma7455_write_raw,
		.driver_module = THIS_MODULE,
		};

		#define MMA7455_CHANNEL(axis, idx) { \
		.type = IIO_ACCEL, \
		.modified = 1, \
		.address = MMA7455_REG_##axis##OUTL,\
		.channel2 = IIO_MOD_##axis, \
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) \| \
		BIT(IIO_CHAN_INFO_SCALE), \
		.scan_index = idx, \
		.scan_type = { \
		.sign = 's', \
		.realbits = 10, \
		.storagebits = 16, \
		.endianness = IIO_LE, \
		}, \
		}

		static const struct iio_chan_spec mma7455_channels[] = {
		MMA7455_CHANNEL(X, 0),
		MMA7455_CHANNEL(Y, 1),
		MMA7455_CHANNEL(Z, 2),
		IIO_CHAN_SOFT_TIMESTAMP(3),
		};

		static const unsigned long mma7455_scan_masks[] = {0x7, 0};

		const struct regmap_config mma7455_core_regmap = {
		.reg_bits = 8,
		.val_bits = 8,
		.max_register = MMA7455_REG_TW,
		};
		EXPORT_SYMBOL_GPL(mma7455_core_regmap);

		int mma7455_core_probe(struct device dev, struct regmap regmap,
		const char *name)
		{
		struct mma7455_data *mma7455;
		struct iio_dev *indio_dev;
		unsigned int reg;
		int ret;

		ret = regmap_read(regmap, MMA7455_REG_WHOAMI, &reg);
		if (ret) {
		dev_err(dev, "unable to read reg\n");
		return ret;
		}

		if (reg != MMA7455_WHOAMI_ID) {
		dev_err(dev, "device id mismatch\n");
		return -ENODEV;
		}

		indio_dev = devm_iio_device_alloc(dev, sizeof(*mma7455));
		if (!indio_dev)
		return -ENOMEM;

		dev_set_drvdata(dev, indio_dev);
		mma7455 = iio_priv(indio_dev);
		mma7455->regmap = regmap;
		mma7455->dev = dev;

		indio_dev->info = &mma7455_info;
		indio_dev->name = name;
		indio_dev->dev.parent = dev;
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->channels = mma7455_channels;
		indio_dev->num_channels = ARRAY_SIZE(mma7455_channels);
		indio_dev->available_scan_masks = mma7455_scan_masks;

		regmap_write(mma7455->regmap, MMA7455_REG_MCTL,
		MMA7455_MCTL_MODE_MEASURE);

		ret = iio_triggered_buffer_setup(indio_dev, NULL,
		mma7455_trigger_handler, NULL);
		if (ret) {
		dev_err(dev, "unable to setup triggered buffer\n");
		return ret;
		}

		ret = iio_device_register(indio_dev);
		if (ret) {
		dev_err(dev, "unable to register device\n");
		iio_triggered_buffer_cleanup(indio_dev);
		return ret;
		}

		return 0;
		}
		EXPORT_SYMBOL_GPL(mma7455_core_probe);

		int mma7455_core_remove(struct device *dev)
		{
		struct iio_dev *indio_dev = dev_get_drvdata(dev);
		struct mma7455_data *mma7455 = iio_priv(indio_dev);

		iio_device_unregister(indio_dev);
		iio_triggered_buffer_cleanup(indio_dev);

		regmap_write(mma7455->regmap, MMA7455_REG_MCTL,
		MMA7455_MCTL_MODE_STANDBY);

		return 0;
		}
		EXPORT_SYMBOL_GPL(mma7455_core_remove);

		MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
		MODULE_DESCRIPTION("Freescale MMA7455L core accelerometer driver");
		MODULE_LICENSE("GPL v2");

drivers/iio/accel/mma7455_i2c.c

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		/*
		* IIO accel I2C driver for Freescale MMA7455L 3-axis 10-bit accelerometer
		* Copyright 2015 Joachim Eastwood <manabian@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/i2c.h>
		#include <linux/module.h>
		#include <linux/regmap.h>

		#include "mma7455.h"

		static int mma7455_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
		{
		struct regmap *regmap;
		const char *name = NULL;

		regmap = devm_regmap_init_i2c(i2c, &mma7455_core_regmap);
		if (IS_ERR(regmap))
		return PTR_ERR(regmap);

		if (id)
		name = id->name;

		return mma7455_core_probe(&i2c->dev, regmap, name);
		}

		static int mma7455_i2c_remove(struct i2c_client *i2c)
		{
		return mma7455_core_remove(&i2c->dev);
		}

		static const struct i2c_device_id mma7455_i2c_ids[] = {
		{ "mma7455", 0 },
		{ "mma7456", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, mma7455_i2c_ids);

		static struct i2c_driver mma7455_i2c_driver = {
		.probe = mma7455_i2c_probe,
		.remove = mma7455_i2c_remove,
		.id_table = mma7455_i2c_ids,
		.driver = {
		.name = "mma7455-i2c",
		},
		};
		module_i2c_driver(mma7455_i2c_driver);

		MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
		MODULE_DESCRIPTION("Freescale MMA7455L I2C accelerometer driver");
		MODULE_LICENSE("GPL v2");