Commit 121354b2 authored by Song Qiang's avatar Song Qiang Committed by Jonathan Cameron
Browse files

iio: magnetometer: Add driver support for PNI RM3100 



PNI RM3100 is a high resolution, large signal immunity magnetometer,
composed of 3 single sensors and a processing chip with a MagI2C
interface.

Following functions are available:
 - Single-shot measurement from
   /sys/bus/iio/devices/iio:deviceX/in_magn_{axis}_raw
 - Triggerd buffer measurement.
 - DRDY pin for data ready trigger.
 - Both i2c and spi interface are supported.
 - Both interrupt and polling measurement is supported, depends on if
   the 'interrupts' in DT is declared.

Signed-off-by: default avatarSong Qiang <songqiang1304521@gmail.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 9a8d64fa

MAINTAINERS

+7 −0
Original line number Diff line number Diff line
@@ -11607,6 +11607,13 @@ M: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com> 
S:	Maintained

F:	drivers/pnp/



PNI RM3100 IIO DRIVER

M:	Song Qiang <songqiang1304521@gmail.com>

L:	linux-iio@vger.kernel.org

S:	Maintained

F:	drivers/iio/magnetometer/rm3100*

F:	Documentation/devicetree/bindings/iio/magnetometer/pni,rm3100.txt



POSIX CLOCKS and TIMERS

M:	Thomas Gleixner <tglx@linutronix.de>

L:	linux-kernel@vger.kernel.org

drivers/iio/magnetometer/Kconfig

+29 −0
Original line number Diff line number Diff line
@@ -175,4 +175,33 @@ config SENSORS_HMC5843_SPI 
	  - hmc5843_core (core functions)

	  - hmc5843_spi (support for HMC5983)



config SENSORS_RM3100

	tristate

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER



config SENSORS_RM3100_I2C

	tristate "PNI RM3100 3-Axis Magnetometer (I2C)"

	depends on I2C

	select SENSORS_RM3100

	select REGMAP_I2C

	help

	  Say Y here to add support for the PNI RM3100 3-Axis Magnetometer.



	  This driver can also be compiled as a module.

	  To compile this driver as a module, choose M here: the module

	  will be called rm3100-i2c.



config SENSORS_RM3100_SPI

	tristate "PNI RM3100 3-Axis Magnetometer (SPI)"

	depends on SPI_MASTER

	select SENSORS_RM3100

	select REGMAP_SPI

	help

	  Say Y here to add support for the PNI RM3100 3-Axis Magnetometer.



	  This driver can also be compiled as a module.

	  To compile this driver as a module, choose M here: the module

	  will be called rm3100-spi.



endmenu

drivers/iio/magnetometer/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -24,3 +24,7 @@ obj-$(CONFIG_IIO_ST_MAGN_SPI_3AXIS) += st_magn_spi.o 
obj-$(CONFIG_SENSORS_HMC5843)		+= hmc5843_core.o

obj-$(CONFIG_SENSORS_HMC5843_I2C)	+= hmc5843_i2c.o

obj-$(CONFIG_SENSORS_HMC5843_SPI)	+= hmc5843_spi.o



obj-$(CONFIG_SENSORS_RM3100)		+= rm3100-core.o

obj-$(CONFIG_SENSORS_RM3100_I2C)	+= rm3100-i2c.o

obj-$(CONFIG_SENSORS_RM3100_SPI)	+= rm3100-spi.o

drivers/iio/magnetometer/rm3100-core.c

0 → 100644
+616 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * PNI RM3100 3-axis geomagnetic sensor driver core.

 *

 * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>

 *

 * User Manual available at

 * <https://www.pnicorp.com/download/rm3100-user-manual/>

 *

 * TODO: event generation, pm.

 */



#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/module.h>

#include <linux/slab.h>



#include <linux/iio/buffer.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/iio/trigger.h>

#include <linux/iio/triggered_buffer.h>

#include <linux/iio/trigger_consumer.h>



#include "rm3100.h"



/* Cycle Count Registers. */

#define RM3100_REG_CC_X			0x05

#define RM3100_REG_CC_Y			0x07

#define RM3100_REG_CC_Z			0x09



/* Poll Measurement Mode register. */

#define RM3100_REG_POLL			0x00

#define		RM3100_POLL_X		BIT(4)

#define		RM3100_POLL_Y		BIT(5)

#define		RM3100_POLL_Z		BIT(6)



/* Continuous Measurement Mode register. */

#define RM3100_REG_CMM			0x01

#define		RM3100_CMM_START	BIT(0)

#define		RM3100_CMM_X		BIT(4)

#define		RM3100_CMM_Y		BIT(5)

#define		RM3100_CMM_Z		BIT(6)



/* TiMe Rate Configuration register. */

#define RM3100_REG_TMRC			0x0B

#define RM3100_TMRC_OFFSET		0x92



/* Result Status register. */

#define RM3100_REG_STATUS		0x34

#define		RM3100_STATUS_DRDY	BIT(7)



/* Measurement result registers. */

#define RM3100_REG_MX2			0x24

#define RM3100_REG_MY2			0x27

#define RM3100_REG_MZ2			0x2a



#define RM3100_W_REG_START		RM3100_REG_POLL

#define RM3100_W_REG_END		RM3100_REG_TMRC

#define RM3100_R_REG_START		RM3100_REG_POLL

#define RM3100_R_REG_END		RM3100_REG_STATUS

#define RM3100_V_REG_START		RM3100_REG_POLL

#define RM3100_V_REG_END		RM3100_REG_STATUS



/*

 * This is computed by hand, is the sum of channel storage bits and padding

 * bits, which is 4+4+4+12=24 in here.

 */

#define RM3100_SCAN_BYTES		24



#define RM3100_CMM_AXIS_SHIFT		4



struct rm3100_data {

	struct regmap *regmap;

	struct completion measuring_done;

	bool use_interrupt;

	int conversion_time;

	int scale;

	u8 buffer[RM3100_SCAN_BYTES];

	struct iio_trigger *drdy_trig;



	/*

	 * This lock is for protecting the consistency of series of i2c

	 * operations, that is, to make sure a measurement process will

	 * not be interrupted by a set frequency operation, which should

	 * be taken where a series of i2c operation starts, released where

	 * the operation ends.

	 */

	struct mutex lock;

};



static const struct regmap_range rm3100_readable_ranges[] = {

	regmap_reg_range(RM3100_R_REG_START, RM3100_R_REG_END),

};



const struct regmap_access_table rm3100_readable_table = {

	.yes_ranges = rm3100_readable_ranges,

	.n_yes_ranges = ARRAY_SIZE(rm3100_readable_ranges),

};

EXPORT_SYMBOL_GPL(rm3100_readable_table);



static const struct regmap_range rm3100_writable_ranges[] = {

	regmap_reg_range(RM3100_W_REG_START, RM3100_W_REG_END),

};



const struct regmap_access_table rm3100_writable_table = {

	.yes_ranges = rm3100_writable_ranges,

	.n_yes_ranges = ARRAY_SIZE(rm3100_writable_ranges),

};

EXPORT_SYMBOL_GPL(rm3100_writable_table);



static const struct regmap_range rm3100_volatile_ranges[] = {

	regmap_reg_range(RM3100_V_REG_START, RM3100_V_REG_END),

};



const struct regmap_access_table rm3100_volatile_table = {

	.yes_ranges = rm3100_volatile_ranges,

	.n_yes_ranges = ARRAY_SIZE(rm3100_volatile_ranges),

};

EXPORT_SYMBOL_GPL(rm3100_volatile_table);



static irqreturn_t rm3100_thread_fn(int irq, void *d)

{

	struct iio_dev *indio_dev = d;

	struct rm3100_data *data = iio_priv(indio_dev);



	/*

	 * Write operation to any register or read operation

	 * to first byte of results will clear the interrupt.

	 */

	regmap_write(data->regmap, RM3100_REG_POLL, 0);



	return IRQ_HANDLED;

}



static irqreturn_t rm3100_irq_handler(int irq, void *d)

{

	struct iio_dev *indio_dev = d;

	struct rm3100_data *data = iio_priv(indio_dev);



	switch (indio_dev->currentmode) {

	case INDIO_DIRECT_MODE:

		complete(&data->measuring_done);

		break;

	case INDIO_BUFFER_TRIGGERED:

		iio_trigger_poll(data->drdy_trig);

		break;

	default:

		dev_err(indio_dev->dev.parent,

			"device mode out of control, current mode: %d",

			indio_dev->currentmode);

	}



	return IRQ_WAKE_THREAD;

}



static int rm3100_wait_measurement(struct rm3100_data *data)

{

	struct regmap *regmap = data->regmap;

	unsigned int val;

	int tries = 20;

	int ret;



	/*

	 * A read cycle of 400kbits i2c bus is about 20us, plus the time

	 * used for scheduling, a read cycle of fast mode of this device

	 * can reach 1.7ms, it may be possible for data to arrive just

	 * after we check the RM3100_REG_STATUS. In this case, irq_handler is

	 * called before measuring_done is reinitialized, it will wait

	 * forever for data that has already been ready.

	 * Reinitialize measuring_done before looking up makes sure we

	 * will always capture interrupt no matter when it happens.

	 */

	if (data->use_interrupt)

		reinit_completion(&data->measuring_done);



	ret = regmap_read(regmap, RM3100_REG_STATUS, &val);

	if (ret < 0)

		return ret;



	if ((val & RM3100_STATUS_DRDY) != RM3100_STATUS_DRDY) {

		if (data->use_interrupt) {

			ret = wait_for_completion_timeout(&data->measuring_done,

				msecs_to_jiffies(data->conversion_time));

			if (!ret)

				return -ETIMEDOUT;

		} else {

			do {

				usleep_range(1000, 5000);



				ret = regmap_read(regmap, RM3100_REG_STATUS,

						  &val);

				if (ret < 0)

					return ret;



				if (val & RM3100_STATUS_DRDY)

					break;

			} while (--tries);

			if (!tries)

				return -ETIMEDOUT;

		}

	}

	return 0;

}



static int rm3100_read_mag(struct rm3100_data *data, int idx, int *val)

{

	struct regmap *regmap = data->regmap;

	u8 buffer[3];

	int ret;



	mutex_lock(&data->lock);

	ret = regmap_write(regmap, RM3100_REG_POLL, BIT(4 + idx));

	if (ret < 0)

		goto unlock_return;



	ret = rm3100_wait_measurement(data);

	if (ret < 0)

		goto unlock_return;



	ret = regmap_bulk_read(regmap, RM3100_REG_MX2 + 3 * idx, buffer, 3);

	if (ret < 0)

		goto unlock_return;

	mutex_unlock(&data->lock);



	*val = sign_extend32((buffer[0] << 16) | (buffer[1] << 8) | buffer[2],

			     23);



	return IIO_VAL_INT;



unlock_return:

	mutex_unlock(&data->lock);

	return ret;

}



#define RM3100_CHANNEL(axis, idx)					\

	{								\

		.type = IIO_MAGN,					\

		.modified = 1,						\

		.channel2 = IIO_MOD_##axis,				\

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\

		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |	\

			BIT(IIO_CHAN_INFO_SAMP_FREQ),			\

		.scan_index = idx,					\

		.scan_type = {						\

			.sign = 's',					\

			.realbits = 24,					\

			.storagebits = 32,				\

			.shift = 8,					\

			.endianness = IIO_BE,				\

		},							\

	}



static const struct iio_chan_spec rm3100_channels[] = {

	RM3100_CHANNEL(X, 0),

	RM3100_CHANNEL(Y, 1),

	RM3100_CHANNEL(Z, 2),

	IIO_CHAN_SOFT_TIMESTAMP(3),

};



static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(

	"600 300 150 75 37 18 9 4.5 2.3 1.2 0.6 0.3 0.015 0.075"

);



static struct attribute *rm3100_attributes[] = {

	&iio_const_attr_sampling_frequency_available.dev_attr.attr,

	NULL,

};



static const struct attribute_group rm3100_attribute_group = {

	.attrs = rm3100_attributes,

};



#define RM3100_SAMP_NUM			14



/*

 * Frequency : rm3100_samp_rates[][0].rm3100_samp_rates[][1]Hz.

 * Time between reading: rm3100_sam_rates[][2]ms.

 * The first one is actually 1.7ms.

 */

static const int rm3100_samp_rates[RM3100_SAMP_NUM][3] = {

	{600, 0, 2}, {300, 0, 3}, {150, 0, 7}, {75, 0, 13}, {37, 0, 27},

	{18, 0, 55}, {9, 0, 110}, {4, 500000, 220}, {2, 300000, 440},

	{1, 200000, 800}, {0, 600000, 1600}, {0, 300000, 3300},

	{0, 15000, 6700},  {0, 75000, 13000}

};



static int rm3100_get_samp_freq(struct rm3100_data *data, int *val, int *val2)

{

	unsigned int tmp;

	int ret;



	mutex_lock(&data->lock);

	ret = regmap_read(data->regmap, RM3100_REG_TMRC, &tmp);

	mutex_unlock(&data->lock);

	if (ret < 0)

		return ret;

	*val = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][0];

	*val2 = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][1];



	return IIO_VAL_INT_PLUS_MICRO;

}



static int rm3100_set_cycle_count(struct rm3100_data *data, int val)

{

	int ret;

	u8 i;



	for (i = 0; i < 3; i++) {

		ret = regmap_write(data->regmap, RM3100_REG_CC_X + 2 * i, val);

		if (ret < 0)

			return ret;

	}



	/*

	 * The scale of this sensor depends on the cycle count value, these

	 * three values are corresponding to the cycle count value 50, 100,

	 * 200. scale = output / gain * 10^4.

	 */

	switch (val) {

	case 50:

		data->scale = 500;

		break;

	case 100:

		data->scale = 263;

		break;

	/*

	 * case 200:

	 * This function will never be called by users' code, so here we

	 * assume that it will never get a wrong parameter.

	 */

	default:

		data->scale = 133;

	}



	return 0;

}



static int rm3100_set_samp_freq(struct iio_dev *indio_dev, int val, int val2)

{

	struct rm3100_data *data = iio_priv(indio_dev);

	struct regmap *regmap = data->regmap;

	unsigned int cycle_count;

	int ret;

	int i;



	mutex_lock(&data->lock);

	/* All cycle count registers use the same value. */

	ret = regmap_read(regmap, RM3100_REG_CC_X, &cycle_count);

	if (ret < 0)

		goto unlock_return;



	for (i = 0; i < RM3100_SAMP_NUM; i++) {

		if (val == rm3100_samp_rates[i][0] &&

		    val2 == rm3100_samp_rates[i][1])

			break;

	}

	if (i == RM3100_SAMP_NUM) {

		ret = -EINVAL;

		goto unlock_return;

	}



	ret = regmap_write(regmap, RM3100_REG_TMRC, i + RM3100_TMRC_OFFSET);

	if (ret < 0)

		goto unlock_return;



	/* Checking if cycle count registers need changing. */

	if (val == 600 && cycle_count == 200) {

		ret = rm3100_set_cycle_count(data, 100);

		if (ret < 0)

			goto unlock_return;

	} else if (val != 600 && cycle_count == 100) {

		ret = rm3100_set_cycle_count(data, 200);

		if (ret < 0)

			goto unlock_return;

	}



	if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {

		/* Writing TMRC registers requires CMM reset. */

		ret = regmap_write(regmap, RM3100_REG_CMM, 0);

		if (ret < 0)

			goto unlock_return;

		ret = regmap_write(data->regmap, RM3100_REG_CMM,

			(*indio_dev->active_scan_mask & 0x7) <<

			RM3100_CMM_AXIS_SHIFT | RM3100_CMM_START);

		if (ret < 0)

			goto unlock_return;

	}

	mutex_unlock(&data->lock);



	data->conversion_time = rm3100_samp_rates[i][2] * 2;

	return 0;



unlock_return:

	mutex_unlock(&data->lock);

	return ret;

}



static int rm3100_read_raw(struct iio_dev *indio_dev,

			   const struct iio_chan_spec *chan,

			   int *val, int *val2, long mask)

{

	struct rm3100_data *data = iio_priv(indio_dev);

	int ret;



	switch (mask) {

	case IIO_CHAN_INFO_RAW:

		ret = iio_device_claim_direct_mode(indio_dev);

		if (ret < 0)

			return ret;



		ret = rm3100_read_mag(data, chan->scan_index, val);

		iio_device_release_direct_mode(indio_dev);



		return ret;

	case IIO_CHAN_INFO_SCALE:

		*val = 0;

		*val2 = data->scale;



		return IIO_VAL_INT_PLUS_MICRO;

	case IIO_CHAN_INFO_SAMP_FREQ:

		return rm3100_get_samp_freq(data, val, val2);

	default:

		return -EINVAL;

	}

}



static int rm3100_write_raw(struct iio_dev *indio_dev,

			    struct iio_chan_spec const *chan,

			    int val, int val2, long mask)

{

	switch (mask) {

	case IIO_CHAN_INFO_SAMP_FREQ:

		return rm3100_set_samp_freq(indio_dev, val, val2);

	default:

		return -EINVAL;

	}

}



static const struct iio_info rm3100_info = {

	.attrs = &rm3100_attribute_group,

	.read_raw = rm3100_read_raw,

	.write_raw = rm3100_write_raw,

};



static int rm3100_buffer_preenable(struct iio_dev *indio_dev)

{

	struct rm3100_data *data = iio_priv(indio_dev);



	/* Starting channels enabled. */

	return regmap_write(data->regmap, RM3100_REG_CMM,

		(*indio_dev->active_scan_mask & 0x7) << RM3100_CMM_AXIS_SHIFT |

		RM3100_CMM_START);

}



static int rm3100_buffer_postdisable(struct iio_dev *indio_dev)

{

	struct rm3100_data *data = iio_priv(indio_dev);



	return regmap_write(data->regmap, RM3100_REG_CMM, 0);

}



static const struct iio_buffer_setup_ops rm3100_buffer_ops = {

	.preenable = rm3100_buffer_preenable,

	.postenable = iio_triggered_buffer_postenable,

	.predisable = iio_triggered_buffer_predisable,

	.postdisable = rm3100_buffer_postdisable,

};



static irqreturn_t rm3100_trigger_handler(int irq, void *p)

{

	struct iio_poll_func *pf = p;

	struct iio_dev *indio_dev = pf->indio_dev;

	unsigned long scan_mask = *indio_dev->active_scan_mask;

	unsigned int mask_len = indio_dev->masklength;

	struct rm3100_data *data = iio_priv(indio_dev);

	struct regmap *regmap = data->regmap;

	int ret, i, bit;



	mutex_lock(&data->lock);

	switch (scan_mask) {

	case BIT(0) | BIT(1) | BIT(2):

		ret = regmap_bulk_read(regmap, RM3100_REG_MX2, data->buffer, 9);

		mutex_unlock(&data->lock);

		if (ret < 0)

			goto done;

		/* Convert XXXYYYZZZxxx to XXXxYYYxZZZx. x for paddings. */

		for (i = 2; i > 0; i--)

			memmove(data->buffer + i * 4, data->buffer + i * 3, 3);

		break;

	case BIT(0) | BIT(1):

		ret = regmap_bulk_read(regmap, RM3100_REG_MX2, data->buffer, 6);

		mutex_unlock(&data->lock);

		if (ret < 0)

			goto done;

		memmove(data->buffer + 4, data->buffer + 3, 3);

		break;

	case BIT(1) | BIT(2):

		ret = regmap_bulk_read(regmap, RM3100_REG_MY2, data->buffer, 6);

		mutex_unlock(&data->lock);

		if (ret < 0)

			goto done;

		memmove(data->buffer + 4, data->buffer + 3, 3);

		break;

	case BIT(0) | BIT(2):

		ret = regmap_bulk_read(regmap, RM3100_REG_MX2, data->buffer, 9);

		mutex_unlock(&data->lock);

		if (ret < 0)

			goto done;

		memmove(data->buffer + 4, data->buffer + 6, 3);

		break;

	default:

		for_each_set_bit(bit, &scan_mask, mask_len) {

			ret = regmap_bulk_read(regmap, RM3100_REG_MX2 + 3 * bit,

					       data->buffer, 3);

			if (ret < 0) {

				mutex_unlock(&data->lock);

				goto done;

			}

		}

		mutex_unlock(&data->lock);

	}

	/*

	 * Always using the same buffer so that we wouldn't need to set the

	 * paddings to 0 in case of leaking any data.

	 */

	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,

					   pf->timestamp);

done:

	iio_trigger_notify_done(indio_dev->trig);



	return IRQ_HANDLED;

}



int rm3100_common_probe(struct device *dev, struct regmap *regmap, int irq)

{

	struct iio_dev *indio_dev;

	struct rm3100_data *data;

	unsigned int tmp;

	int ret;



	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));

	if (!indio_dev)

		return -ENOMEM;



	data = iio_priv(indio_dev);

	data->regmap = regmap;



	mutex_init(&data->lock);



	indio_dev->dev.parent = dev;

	indio_dev->name = "rm3100";

	indio_dev->info = &rm3100_info;

	indio_dev->channels = rm3100_channels;

	indio_dev->num_channels = ARRAY_SIZE(rm3100_channels);

	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_TRIGGERED;

	indio_dev->currentmode = INDIO_DIRECT_MODE;



	if (!irq)

		data->use_interrupt = false;

	else {

		data->use_interrupt = true;



		init_completion(&data->measuring_done);

		ret = devm_request_threaded_irq(dev,

						irq,

						rm3100_irq_handler,

						rm3100_thread_fn,

						IRQF_TRIGGER_HIGH |

						IRQF_ONESHOT,

						indio_dev->name,

						indio_dev);

		if (ret < 0) {

			dev_err(dev, "request irq line failed.\n");

			return ret;

		}



		data->drdy_trig = devm_iio_trigger_alloc(dev, "%s-drdy%d",

							 indio_dev->name,

							 indio_dev->id);

		if (!data->drdy_trig)

			return -ENOMEM;



		data->drdy_trig->dev.parent = dev;

		ret = devm_iio_trigger_register(dev, data->drdy_trig);

		if (ret < 0)

			return ret;

	}



	ret = devm_iio_triggered_buffer_setup(dev, indio_dev,

					      &iio_pollfunc_store_time,

					      rm3100_trigger_handler,

					      &rm3100_buffer_ops);

	if (ret < 0)

		return ret;



	ret = regmap_read(regmap, RM3100_REG_TMRC, &tmp);

	if (ret < 0)

		return ret;

	/* Initializing max wait time, which is double conversion time. */

	data->conversion_time = rm3100_samp_rates[tmp - RM3100_TMRC_OFFSET][2]

				* 2;



	/* Cycle count values may not be what we want. */

	if ((tmp - RM3100_TMRC_OFFSET) == 0)

		rm3100_set_cycle_count(data, 100);

	else

		rm3100_set_cycle_count(data, 200);



	return devm_iio_device_register(dev, indio_dev);

}

EXPORT_SYMBOL_GPL(rm3100_common_probe);



MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");

MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer i2c driver");

MODULE_LICENSE("GPL v2");

drivers/iio/magnetometer/rm3100-i2c.c

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// SPDX-License-Identifier: GPL-2.0

/*

 * Support for PNI RM3100 3-axis geomagnetic sensor on a i2c bus.

 *

 * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>

 *

 * i2c slave address: 0x20 + SA1 << 1 + SA0.

 */



#include <linux/i2c.h>

#include <linux/module.h>



#include "rm3100.h"



static const struct regmap_config rm3100_regmap_config = {

	.reg_bits = 8,

	.val_bits = 8,



	.rd_table = &rm3100_readable_table,

	.wr_table = &rm3100_writable_table,

	.volatile_table = &rm3100_volatile_table,



	.cache_type = REGCACHE_RBTREE,

};



static int rm3100_probe(struct i2c_client *client)

{

	struct regmap *regmap;



	regmap = devm_regmap_init_i2c(client, &rm3100_regmap_config);

	if (IS_ERR(regmap))

		return PTR_ERR(regmap);



	return rm3100_common_probe(&client->dev, regmap, client->irq);

}



static const struct of_device_id rm3100_dt_match[] = {

	{ .compatible = "pni,rm3100", },

	{ }

};

MODULE_DEVICE_TABLE(of, rm3100_dt_match);



static struct i2c_driver rm3100_driver = {

	.driver = {

		.name = "rm3100-i2c",

		.of_match_table = rm3100_dt_match,

	},

	.probe_new = rm3100_probe,

};

module_i2c_driver(rm3100_driver);



MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");

MODULE_DESCRIPTION("PNI RM3100 3-axis magnetometer i2c driver");

MODULE_LICENSE("GPL v2");

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