path: root/drivers/iio/imu/kmx61.c

/*
 * KMX61 - Kionix 6-axis Accelerometer/Magnetometer
 *
 * Copyright (c) 2014, Intel Corporation.
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License.  See the file COPYING in the main
 * directory of this archive for more details.
 *
 * IIO driver for KMX61 (7-bit I2C slave address 0x0E or 0x0F).
 *
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/trigger.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>

#define KMX61_DRV_NAME "kmx61"
#define KMX61_GPIO_NAME "kmx61_int"
#define KMX61_IRQ_NAME "kmx61_event"

#define KMX61_REG_WHO_AM_I	0x00
#define KMX61_REG_INS1		0x01
#define KMX61_REG_INS2		0x02

/*
 * three 16-bit accelerometer output registers for X/Y/Z axis
 * we use only XOUT_L as a base register, all other addresses
 * can be obtained by applying an offset and are provided here
 * only for clarity.
 */
#define KMX61_ACC_XOUT_L	0x0A
#define KMX61_ACC_XOUT_H	0x0B
#define KMX61_ACC_YOUT_L	0x0C
#define KMX61_ACC_YOUT_H	0x0D
#define KMX61_ACC_ZOUT_L	0x0E
#define KMX61_ACC_ZOUT_H	0x0F

/*
 * one 16-bit temperature output register
 */
#define KMX61_TEMP_L		0x10
#define KMX61_TEMP_H		0x11

/*
 * three 16-bit magnetometer output registers for X/Y/Z axis
 */
#define KMX61_MAG_XOUT_L	0x12
#define KMX61_MAG_XOUT_H	0x13
#define KMX61_MAG_YOUT_L	0x14
#define KMX61_MAG_YOUT_H	0x15
#define KMX61_MAG_ZOUT_L	0x16
#define KMX61_MAG_ZOUT_H	0x17

#define KMX61_REG_INL		0x28
#define KMX61_REG_STBY		0x29
#define KMX61_REG_CTRL1		0x2A
#define KMX61_REG_CTRL2		0x2B
#define KMX61_REG_ODCNTL	0x2C
#define KMX61_REG_INC1		0x2D

#define KMX61_REG_WUF_THRESH	0x3D
#define KMX61_REG_WUF_TIMER	0x3E

#define KMX61_ACC_STBY_BIT	BIT(0)
#define KMX61_MAG_STBY_BIT	BIT(1)
#define KMX61_ACT_STBY_BIT	BIT(7)

#define KMX61_ALL_STBY		(KMX61_ACC_STBY_BIT | KMX61_MAG_STBY_BIT)

#define KMX61_REG_INS1_BIT_WUFS		BIT(1)

#define KMX61_REG_INS2_BIT_ZP		BIT(0)
#define KMX61_REG_INS2_BIT_ZN		BIT(1)
#define KMX61_REG_INS2_BIT_YP		BIT(2)
#define KMX61_REG_INS2_BIT_YN		BIT(3)
#define KMX61_REG_INS2_BIT_XP		BIT(4)
#define KMX61_REG_INS2_BIT_XN		BIT(5)

#define KMX61_REG_CTRL1_GSEL_MASK	0x03

#define KMX61_REG_CTRL1_BIT_RES		BIT(4)
#define KMX61_REG_CTRL1_BIT_DRDYE	BIT(5)
#define KMX61_REG_CTRL1_BIT_WUFE	BIT(6)
#define KMX61_REG_CTRL1_BIT_BTSE	BIT(7)

#define KMX61_REG_INC1_BIT_WUFS		BIT(0)
#define KMX61_REG_INC1_BIT_DRDYM	BIT(1)
#define KMX61_REG_INC1_BIT_DRDYA	BIT(2)
#define KMX61_REG_INC1_BIT_IEN		BIT(5)

#define KMX61_ACC_ODR_SHIFT	0
#define KMX61_MAG_ODR_SHIFT	4
#define KMX61_ACC_ODR_MASK	0x0F
#define KMX61_MAG_ODR_MASK	0xF0

#define KMX61_OWUF_MASK		0x7

#define KMX61_DEFAULT_WAKE_THRESH	1
#define KMX61_DEFAULT_WAKE_DURATION	1

#define KMX61_SLEEP_DELAY_MS	2000

#define KMX61_CHIP_ID		0x12

/* KMX61 devices */
#define KMX61_ACC	0x01
#define KMX61_MAG	0x02

struct kmx61_data {
	struct i2c_client *client;

	/* serialize access to non-atomic ops, e.g set_mode */
	struct mutex lock;

	/* standby state */
	bool acc_stby;
	bool mag_stby;

	/* power state */
	bool acc_ps;
	bool mag_ps;

	/* config bits */
	u8 range;
	u8 odr_bits;
	u8 wake_thresh;
	u8 wake_duration;

	/* accelerometer specific data */
	struct iio_dev *acc_indio_dev;
	struct iio_trigger *acc_dready_trig;
	struct iio_trigger *motion_trig;
	bool acc_dready_trig_on;
	bool motion_trig_on;
	bool ev_enable_state;

	/* magnetometer specific data */
	struct iio_dev *mag_indio_dev;
	struct iio_trigger *mag_dready_trig;
	bool mag_dready_trig_on;
};

enum kmx61_range {
	KMX61_RANGE_2G,
	KMX61_RANGE_4G,
	KMX61_RANGE_8G,
};

enum kmx61_axis {
	KMX61_AXIS_X,
	KMX61_AXIS_Y,
	KMX61_AXIS_Z,
};

static const u16 kmx61_uscale_table[] = {9582, 19163, 38326};

static const struct {
	int val;
	int val2;
} kmx61_samp_freq_table[] = { {12, 500000},
			{25, 0},
			{50, 0},
			{100, 0},
			{200, 0},
			{400, 0},
			{800, 0},
			{1600, 0},
			{0, 781000},
			{1, 563000},
			{3, 125000},
			{6, 250000} };

static const struct {
	int val;
	int val2;
	int odr_bits;
} kmx61_wake_up_odr_table[] = { {0, 781000, 0x00},
				 {1, 563000, 0x01},
				 {3, 125000, 0x02},
				 {6, 250000, 0x03},
				 {12, 500000, 0x04},
				 {25, 0, 0x05},
				 {50, 0, 0x06},
				 {100, 0, 0x06},
				 {200, 0, 0x06},
				 {400, 0, 0x06},
				 {800, 0, 0x06},
				 {1600, 0, 0x06} };

static IIO_CONST_ATTR(accel_scale_available, "0.009582 0.019163 0.038326");
static IIO_CONST_ATTR(magn_scale_available, "0.001465");
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
	"0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800");

static struct attribute *kmx61_acc_attributes[] = {
	&iio_const_attr_accel_scale_available.dev_attr.attr,
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};

static struct attribute *kmx61_mag_attributes[] = {
	&iio_const_attr_magn_scale_available.dev_attr.attr,
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group kmx61_acc_attribute_group = {
	.attrs = kmx61_acc_attributes,
};

static const struct attribute_group kmx61_mag_attribute_group = {
	.attrs = kmx61_mag_attributes,
};

static const struct iio_event_spec kmx61_event = {
	.type = IIO_EV_TYPE_THRESH,
	.dir = IIO_EV_DIR_EITHER,
	.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			 BIT(IIO_EV_INFO_ENABLE) |
			 BIT(IIO_EV_INFO_PERIOD),
};

#define KMX61_ACC