Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1266 insertions, 0 deletions

diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
new file mode 100644
index 000000000..a23a7685d
--- /dev/null
+++ b/drivers/iio/accel/mma9553.c
@@ -0,0 +1,1266 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Freescale MMA9553L Intelligent Pedometer driver
+ * Copyright (c) 2014, Intel Corporation.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+#include <linux/pm_runtime.h>
+#include "mma9551_core.h"
+
+#define MMA9553_DRV_NAME			"mma9553"
+#define MMA9553_IRQ_NAME			"mma9553_event"
+
+/* Pedometer configuration registers (R/W) */
+#define MMA9553_REG_CONF_SLEEPMIN		0x00
+#define MMA9553_REG_CONF_SLEEPMAX		0x02
+#define MMA9553_REG_CONF_SLEEPTHD		0x04
+#define MMA9553_MASK_CONF_WORD			GENMASK(15, 0)
+
+#define MMA9553_REG_CONF_CONF_STEPLEN		0x06
+#define MMA9553_MASK_CONF_CONFIG		BIT(15)
+#define MMA9553_MASK_CONF_ACT_DBCNTM		BIT(14)
+#define MMA9553_MASK_CONF_SLP_DBCNTM		BIT(13)
+#define MMA9553_MASK_CONF_STEPLEN		GENMASK(7, 0)
+
+#define MMA9553_REG_CONF_HEIGHT_WEIGHT		0x08
+#define MMA9553_MASK_CONF_HEIGHT		GENMASK(15, 8)
+#define MMA9553_MASK_CONF_WEIGHT		GENMASK(7, 0)
+
+#define MMA9553_REG_CONF_FILTER			0x0A
+#define MMA9553_MASK_CONF_FILTSTEP		GENMASK(15, 8)
+#define MMA9553_MASK_CONF_MALE			BIT(7)
+#define MMA9553_MASK_CONF_FILTTIME		GENMASK(6, 0)
+
+#define MMA9553_REG_CONF_SPEED_STEP		0x0C
+#define MMA9553_MASK_CONF_SPDPRD		GENMASK(15, 8)
+#define MMA9553_MASK_CONF_STEPCOALESCE		GENMASK(7, 0)
+
+#define MMA9553_REG_CONF_ACTTHD			0x0E
+#define MMA9553_MAX_ACTTHD			GENMASK(15, 0)
+
+/* Pedometer status registers (R-only) */
+#define MMA9553_REG_STATUS			0x00
+#define MMA9553_MASK_STATUS_MRGFL		BIT(15)
+#define MMA9553_MASK_STATUS_SUSPCHG		BIT(14)
+#define MMA9553_MASK_STATUS_STEPCHG		BIT(13)
+#define MMA9553_MASK_STATUS_ACTCHG		BIT(12)
+#define MMA9553_MASK_STATUS_SUSP		BIT(11)
+#define MMA9553_MASK_STATUS_ACTIVITY		GENMASK(10, 8)
+#define MMA9553_MASK_STATUS_VERSION		GENMASK(7, 0)
+
+#define MMA9553_REG_STEPCNT			0x02
+#define MMA9553_REG_DISTANCE			0x04
+#define MMA9553_REG_SPEED			0x06
+#define MMA9553_REG_CALORIES			0x08
+#define MMA9553_REG_SLEEPCNT			0x0A
+
+/* Pedometer events are always mapped to this pin. */
+#define MMA9553_DEFAULT_GPIO_PIN	mma9551_gpio6
+#define MMA9553_DEFAULT_GPIO_POLARITY	0
+
+/* Bitnum used for GPIO configuration = bit number in high status byte */
+#define MMA9553_STATUS_TO_BITNUM(bit)	(ffs(bit) - 9)
+#define MMA9553_MAX_BITNUM		MMA9553_STATUS_TO_BITNUM(BIT(16))
+
+#define MMA9553_DEFAULT_SAMPLE_RATE	30	/* Hz */
+
+/*
+ * The internal activity level must be stable for ACTTHD samples before
+ * ACTIVITY is updated. The ACTIVITY variable contains the current activity
+ * level and is updated every time a step is detected or once a second
+ * if there are no steps.
+ */
+#define MMA9553_ACTIVITY_THD_TO_SEC(thd) ((thd) / MMA9553_DEFAULT_SAMPLE_RATE)
+#define MMA9553_ACTIVITY_SEC_TO_THD(sec) ((sec) * MMA9553_DEFAULT_SAMPLE_RATE)
+
+/*
+ * Autonomously suspend pedometer if acceleration vector magnitude
+ * is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
+ */
+#define MMA9553_DEFAULT_SLEEPMIN	3688	/* 0,9 g */
+#define MMA9553_DEFAULT_SLEEPMAX	4508	/* 1,1 g */
+#define MMA9553_DEFAULT_SLEEPTHD	(MMA9553_DEFAULT_SAMPLE_RATE * 30)
+
+#define MMA9553_CONFIG_RETRIES		2
+
+/* Status register - activity field  */
+enum activity_level {
+	ACTIVITY_UNKNOWN,
+	ACTIVITY_REST,
+	ACTIVITY_WALKING,
+	ACTIVITY_JOGGING,
+	ACTIVITY_RUNNING,
+};
+
+static struct mma9553_event_info {
+	enum iio_chan_type type;
+	enum iio_modifier mod;
+	enum iio_event_direction dir;
+} mma9553_events_info[] = {
+	{
+		.type = IIO_STEPS,
+		.mod = IIO_NO_MOD,
+		.dir = IIO_EV_DIR_NONE,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_STILL,
+		.dir = IIO_EV_DIR_RISING,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_STILL,
+		.dir = IIO_EV_DIR_FALLING,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_WALKING,
+		.dir = IIO_EV_DIR_RISING,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_WALKING,
+		.dir = IIO_EV_DIR_FALLING,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_JOGGING,
+		.dir = IIO_EV_DIR_RISING,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_JOGGING,
+		.dir = IIO_EV_DIR_FALLING,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_RUNNING,
+		.dir = IIO_EV_DIR_RISING,
+	},
+	{
+		.type = IIO_ACTIVITY,
+		.mod = IIO_MOD_RUNNING,
+		.dir = IIO_EV_DIR_FALLING,
+	},
+};
+
+#define MMA9553_EVENTS_INFO_SIZE ARRAY_SIZE(mma9553_events_info)
+
+struct mma9553_event {
+	struct mma9553_event_info *info;
+	bool enabled;
+};
+
+struct mma9553_conf_regs {
+	u16 sleepmin;
+	u16 sleepmax;
+	u16 sleepthd;
+	u16 config;
+	u16 height_weight;
+	u16 filter;
+	u16 speed_step;
+	u16 actthd;
+} __packed;
+
+struct mma9553_data {
+	struct i2c_client *client;
+	/*
+	 * 1. Serialize access to HW (requested by mma9551_core API).
+	 * 2. Serialize sequences that power on/off the device and access HW.
+	 */
+	struct mutex mutex;
+	struct mma9553_conf_regs conf;
+	struct mma9553_event events[MMA9553_EVENTS_INFO_SIZE];
+	int num_events;
+	u8 gpio_bitnum;
+	/*
+	 * This is used for all features that depend on step count:
+	 * step count, distance, speed, calories.
+	 */
+	bool stepcnt_enabled;
+	u16 stepcnt;
+	u8 activity;
+	s64 timestamp;
+};
+
+static u8 mma9553_get_bits(u16 val, u16 mask)
+{
+	return (val & mask) >> (ffs(mask) - 1);
+}
+
+static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
+{
+	return (current_val & ~mask) | (val << (ffs(mask) - 1));
+}
+
+static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
+{
+	switch (activity) {
+	case ACTIVITY_RUNNING:
+		return IIO_MOD_RUNNING;
+	case ACTIVITY_JOGGING:
+		return IIO_MOD_JOGGING;
+	case ACTIVITY_WALKING:
+		return IIO_MOD_WALKING;
+	case ACTIVITY_REST:
+		return IIO_MOD_STILL;
+	case ACTIVITY_UNKNOWN:
+	default:
+		return IIO_NO_MOD;
+	}
+}
+
+static void mma9553_init_events(struct mma9553_data *data)
+{
+	int i;
+
+	data->num_events = MMA9553_EVENTS_INFO_SIZE;
+	for (i = 0; i < data->num_events; i++) {
+		data->events[i].info = &mma9553_events_info[i];
+		data->events[i].enabled = false;
+	}
+}
+
+static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
+					       enum iio_chan_type type,
+					       enum iio_modifier mod,
+					       enum iio_event_direction dir)
+{
+	int i;
+
+	for (i = 0; i < data->num_events; i++)
+		if (data->events[i].info->type == type &&
+		    data->events[i].info->mod == mod &&
+		    data->events[i].info->dir == dir)
+			return &data->events[i];
+
+	return NULL;
+}
+
+static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
+					 bool check_type,
+					 enum iio_chan_type type)
+{
+	int i;
+
+	for (i = 0; i < data->num_events; i++)
+		if ((check_type && data->events[i].info->type == type &&
+		     data->events[i].enabled) ||
+		     (!check_type && data->events[i].enabled))
+			return true;
+
+	return false;
+}
+
+static int mma9553_set_config(struct mma9553_data *data, u16 reg,
+			      u16 *p_reg_val, u16 val, u16 mask)
+{
+	int ret, retries;
+	u16 reg_val, config;
+
+	reg_val = *p_reg_val;
+	if (val == mma9553_get_bits(reg_val, mask))
+		return 0;
+
+	reg_val = mma9553_set_bits(reg_val, val, mask);
+	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
+					reg, reg_val);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"error writing config register 0x%x\n", reg);
+		return ret;
+	}
+
+	*p_reg_val = reg_val;
+
+	/* Reinitializes the pedometer with current configuration values */
+	config = mma9553_set_bits(data->conf.config, 1,
+				  MMA9553_MASK_CONF_CONFIG);
+
+	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
+					MMA9553_REG_CONF_CONF_STEPLEN, config);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"error writing config register 0x%x\n",
+			MMA9553_REG_CONF_CONF_STEPLEN);
+		return ret;
+	}
+
+	retries = MMA9553_CONFIG_RETRIES;
+	do {
+		mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
+		ret = mma9551_read_config_word(data->client,
+					       MMA9551_APPID_PEDOMETER,
+					       MMA9553_REG_CONF_CONF_STEPLEN,
+					       &config);
+		if (ret < 0)
+			return ret;
+	} while (mma9553_get_bits(config, MMA9553_MASK_CONF_CONFIG) &&
+		 --retries > 0);
+
+	return 0;
+}
+
+static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
+					 u8 *activity, u16 *stepcnt)
+{
+	u16 buf[2];
+	int ret;
+
+	ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
+					MMA9553_REG_STATUS, ARRAY_SIZE(buf),
+					buf);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"error reading status and stepcnt\n");
+		return ret;
+	}
+
+	*activity = mma9553_get_bits(buf[0], MMA9553_MASK_STATUS_ACTIVITY);
+	*stepcnt = buf[1];
+
+	return 0;
+}
+
+static int mma9553_conf_gpio(struct mma9553_data *data)
+{
+	u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
+	int ret;
+	struct mma9553_event *ev_step_detect;
+	bool activity_enabled;
+
+	activity_enabled = mma9553_is_any_event_enabled(data, true,
+							IIO_ACTIVITY);
+	ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
+					   IIO_EV_DIR_NONE);
+
+	/*
+	 * If both step detector and activity are enabled, use the MRGFL bit.
+	 * This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
+	 */
+	if (activity_enabled && ev_step_detect->enabled)
+		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_MRGFL);
+	else if (ev_step_detect->enabled)
+		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_STEPCHG);
+	else if (activity_enabled)
+		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_ACTCHG);
+	else			/* Reset */
+		appid = MMA9551_APPID_NONE;
+
+	if (data->gpio_bitnum == bitnum)
+		return 0;
+
+	/* Save initial values for activity and stepcnt */
+	if (activity_enabled || ev_step_detect->enabled) {
+		ret = mma9553_read_activity_stepcnt(data, &data->activity,
+						    &data->stepcnt);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = mma9551_gpio_config(data->client, MMA9553_DEFAULT_GPIO_PIN, appid,
+				  bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
+	if (ret < 0)
+		return ret;
+	data->gpio_bitnum = bitnum;
+
+	return 0;
+}
+
+static int mma9553_init(struct mma9553_data *data)
+{
+	int ret;
+
+	ret = mma9551_read_version(data->client);
+	if (ret)
+		return ret;
+
+	/*
+	 * Read all the pedometer configuration registers. This is used as
+	 * a device identification command to differentiate the MMA9553L
+	 * from the MMA9550L.
+	 */
+	ret = mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
+					MMA9553_REG_CONF_SLEEPMIN,
+					sizeof(data->conf) / sizeof(u16),
+					(u16 *)&data->conf);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"failed to read configuration registers\n");
+		return ret;
+	}
+
+	/* Reset GPIO */
+	data->gpio_bitnum = MMA9553_MAX_BITNUM;
+	ret = mma9553_conf_gpio(data);
+	if (ret < 0)
+		return ret;
+
+	ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
+	if (ret < 0)
+		return ret;
+
+	/* Init config registers */
+	data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
+	data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
+	data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
+	data->conf.config = mma9553_set_bits(data->conf.config, 1,
+					     MMA9553_MASK_CONF_CONFIG);
+	/*
+	 * Clear the activity debounce counter when the activity level changes,
+	 * so that the confidence level applies for any activity level.
+	 */
+	data->conf.config = mma9553_set_bits(data->conf.config, 1,
+					     MMA9553_MASK_CONF_ACT_DBCNTM);
+	ret = mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
+					 MMA9553_REG_CONF_SLEEPMIN,
+					 sizeof(data->conf) / sizeof(u16),
+					 (u16 *)&data->conf);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"failed to write configuration registers\n");
+		return ret;
+	}
+
+	return mma9551_set_device_state(data->client, true);
+}
+
+static int mma9553_read_status_word(struct mma9553_data *data, u16 reg,
+				    u16 *tmp)
+{
+	bool powered_on;
+	int ret;
+
+	/*
+	 * The HW only counts steps and other dependent
+	 * parameters (speed, distance, calories, activity)
+	 * if power is on (from enabling an event or the
+	 * step counter).
+	 */
+	powered_on = mma9553_is_any_event_enabled(data, false, 0) ||
+		     data->stepcnt_enabled;
+	if (!powered_on) {
+		dev_err(&data->client->dev, "No channels enabled\n");
+		return -EINVAL;
+	}
+
+	mutex_lock(&data->mutex);
+	ret = mma9551_read_status_word(data->client, MMA9551_APPID_PEDOMETER,
+				       reg, tmp);
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+
+static int mma9553_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+	int ret;
+	u16 tmp;
+	u8 activity;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (chan->type) {
+		case IIO_STEPS:
+			ret = mma9553_read_status_word(data,
+						       MMA9553_REG_STEPCNT,
+						       &tmp);
+			if (ret < 0)
+				return ret;
+			*val = tmp;
+			return IIO_VAL_INT;
+		case IIO_DISTANCE:
+			ret = mma9553_read_status_word(data,
+						       MMA9553_REG_DISTANCE,
+						       &tmp);
+			if (ret < 0)
+				return ret;
+			*val = tmp;
+			return IIO_VAL_INT;
+		case IIO_ACTIVITY:
+			ret = mma9553_read_status_word(data,
+						       MMA9553_REG_STATUS,
+						       &tmp);
+			if (ret < 0)
+				return ret;
+
+			activity =
+			    mma9553_get_bits(tmp, MMA9553_MASK_STATUS_ACTIVITY);
+
+			/*
+			 * The device does not support confidence value levels,
+			 * so we will always have 100% for current activity and
+			 * 0% for the others.
+			 */
+			if (chan->channel2 == mma9553_activity_to_mod(activity))
+				*val = 100;
+			else
+				*val = 0;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_VELOCITY:	/* m/h */
+			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
+				return -EINVAL;
+			ret = mma9553_read_status_word(data,
+						       MMA9553_REG_SPEED,
+						       &tmp);
+			if (ret < 0)
+				return ret;
+			*val = tmp;
+			return IIO_VAL_INT;
+		case IIO_ENERGY:	/* Cal or kcal */
+			ret = mma9553_read_status_word(data,
+						       MMA9553_REG_CALORIES,
+						       &tmp);
+			if (ret < 0)
+				return ret;
+			*val = tmp;
+			return IIO_VAL_INT;
+		case IIO_ACCEL:
+			mutex_lock(&data->mutex);
+			ret = mma9551_read_accel_chan(data->client,
+						      chan, val, val2);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_VELOCITY:	/* m/h to m/s */
+			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
+				return -EINVAL;
+			*val = 0;
+			*val2 = 277;	/* 0.000277 */
+			return IIO_VAL_INT_PLUS_MICRO;
+		case IIO_ENERGY:	/* Cal or kcal to J */
+			*val = 4184;
+			return IIO_VAL_INT;
+		case IIO_ACCEL:
+			return mma9551_read_accel_scale(val, val2);
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_ENABLE:
+		*val = data->stepcnt_enabled;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_CALIBHEIGHT:
+		tmp = mma9553_get_bits(data->conf.height_weight,
+				       MMA9553_MASK_CONF_HEIGHT);
+		*val = tmp / 100;	/* cm to m */
+		*val2 = (tmp % 100) * 10000;
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_CALIBWEIGHT:
+		*val = mma9553_get_bits(data->conf.height_weight,
+					MMA9553_MASK_CONF_WEIGHT);
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
+		switch (chan->type) {
+		case IIO_STEPS:
+			*val = mma9553_get_bits(data->conf.filter,
+						MMA9553_MASK_CONF_FILTSTEP);
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_DEBOUNCE_TIME:
+		switch (chan->type) {
+		case IIO_STEPS:
+			*val = mma9553_get_bits(data->conf.filter,
+						MMA9553_MASK_CONF_FILTTIME);
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_INT_TIME:
+		switch (chan->type) {
+		case IIO_VELOCITY:
+			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
+				return -EINVAL;
+			*val = mma9553_get_bits(data->conf.speed_step,
+						MMA9553_MASK_CONF_SPDPRD);
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9553_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+	int ret, tmp;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_ENABLE:
+		if (data->stepcnt_enabled == !!val)
+			return 0;
+		mutex_lock(&data->mutex);
+		ret = mma9551_set_power_state(data->client, val);
+		if (ret < 0) {
+			mutex_unlock(&data->mutex);
+			return ret;
+		}
+		data->stepcnt_enabled = val;
+		mutex_unlock(&data->mutex);
+		return 0;
+	case IIO_CHAN_INFO_CALIBHEIGHT:
+		/* m to cm */
+		tmp = val * 100 + val2 / 10000;
+		if (tmp < 0 || tmp > 255)
+			return -EINVAL;
+		mutex_lock(&data->mutex);
+		ret = mma9553_set_config(data,
+					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
+					 &data->conf.height_weight,
+					 tmp, MMA9553_MASK_CONF_HEIGHT);
+		mutex_unlock(&data->mutex);
+		return ret;
+	case IIO_CHAN_INFO_CALIBWEIGHT:
+		if (val < 0 || val > 255)
+			return -EINVAL;
+		mutex_lock(&data->mutex);
+		ret = mma9553_set_config(data,
+					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
+					 &data->conf.height_weight,
+					 val, MMA9553_MASK_CONF_WEIGHT);
+		mutex_unlock(&data->mutex);
+		return ret;
+	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
+		switch (chan->type) {
+		case IIO_STEPS:
+			/*
+			 * Set to 0 to disable step filtering. If the value
+			 * specified is greater than 6, then 6 will be used.
+			 */
+			if (val < 0)
+				return -EINVAL;
+			if (val > 6)
+				val = 6;
+			mutex_lock(&data->mutex);
+			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
+						 &data->conf.filter, val,
+						 MMA9553_MASK_CONF_FILTSTEP);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_DEBOUNCE_TIME:
+		switch (chan->type) {
+		case IIO_STEPS:
+			if (val < 0 || val > 127)
+				return -EINVAL;
+			mutex_lock(&data->mutex);
+			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
+						 &data->conf.filter, val,
+						 MMA9553_MASK_CONF_FILTTIME);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_INT_TIME:
+		switch (chan->type) {
+		case IIO_VELOCITY:
+			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
+				return -EINVAL;
+			/*
+			 * If set to a value greater than 5, then 5 will be
+			 * used. Warning: Do not set SPDPRD to 0 or 1 as
+			 * this may cause undesirable behavior.
+			 */
+			if (val < 2)
+				return -EINVAL;
+			if (val > 5)
+				val = 5;
+			mutex_lock(&data->mutex);
+			ret = mma9553_set_config(data,
+						 MMA9553_REG_CONF_SPEED_STEP,
+						 &data->conf.speed_step, val,
+						 MMA9553_MASK_CONF_SPDPRD);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9553_read_event_config(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+	struct mma9553_event *event;
+
+	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
+	if (!event)
+		return -EINVAL;
+
+	return event->enabled;
+}
+
+static int mma9553_write_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir, int state)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+	struct mma9553_event *event;
+	int ret;
+
+	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
+	if (!event)
+		return -EINVAL;
+
+	if (event->enabled == state)
+		return 0;
+
+	mutex_lock(&data->mutex);
+
+	ret = mma9551_set_power_state(data->client, state);
+	if (ret < 0)
+		goto err_out;
+	event->enabled = state;
+
+	ret = mma9553_conf_gpio(data);
+	if (ret < 0)
+		goto err_conf_gpio;
+
+	mutex_unlock(&data->mutex);
+
+	return 0;
+
+err_conf_gpio:
+	if (state) {
+		event->enabled = false;
+		mma9551_set_power_state(data->client, false);
+	}
+err_out:
+	mutex_unlock(&data->mutex);
+	return ret;
+}
+
+static int mma9553_read_event_value(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir,
+				    enum iio_event_info info,
+				    int *val, int *val2)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+
+	*val2 = 0;
+	switch (info) {
+	case IIO_EV_INFO_VALUE:
+		switch (chan->type) {
+		case IIO_STEPS:
+			*val = mma9553_get_bits(data->conf.speed_step,
+						MMA9553_MASK_CONF_STEPCOALESCE);
+			return IIO_VAL_INT;
+		case IIO_ACTIVITY:
+			/*
+			 * The device does not support confidence value levels.
+			 * We set an average of 50%.
+			 */
+			*val = 50;
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	case IIO_EV_INFO_PERIOD:
+		switch (chan->type) {
+		case IIO_ACTIVITY:
+			*val = MMA9553_ACTIVITY_THD_TO_SEC(data->conf.actthd);
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9553_write_event_value(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir,
+				     enum iio_event_info info,
+				     int val, int val2)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (info) {
+	case IIO_EV_INFO_VALUE:
+		switch (chan->type) {
+		case IIO_STEPS:
+			if (val < 0 || val > 255)
+				return -EINVAL;
+			mutex_lock(&data->mutex);
+			ret = mma9553_set_config(data,
+						MMA9553_REG_CONF_SPEED_STEP,
+						&data->conf.speed_step, val,
+						MMA9553_MASK_CONF_STEPCOALESCE);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	case IIO_EV_INFO_PERIOD:
+		switch (chan->type) {
+		case IIO_ACTIVITY:
+			if (val < 0 || val > MMA9553_ACTIVITY_THD_TO_SEC(
+			    MMA9553_MAX_ACTTHD))
+				return -EINVAL;
+			mutex_lock(&data->mutex);
+			ret = mma9553_set_config(data, MMA9553_REG_CONF_ACTTHD,
+						 &data->conf.actthd,
+						 MMA9553_ACTIVITY_SEC_TO_THD
+						 (val), MMA9553_MASK_CONF_WORD);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9553_get_calibgender_mode(struct iio_dev *indio_dev,
+					const struct iio_chan_spec *chan)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+	u8 gender;
+
+	gender = mma9553_get_bits(data->conf.filter, MMA9553_MASK_CONF_MALE);
+	/*
+	 * HW expects 0 for female and 1 for male,
+	 * while iio index is 0 for male and 1 for female.
+	 */
+	return !gender;
+}
+
+static int mma9553_set_calibgender_mode(struct iio_dev *indio_dev,
+					const struct iio_chan_spec *chan,
+					unsigned int mode)
+{
+	struct mma9553_data *data = iio_priv(indio_dev);
+	u8 gender = !mode;
+	int ret;
+
+	if ((mode != 0) && (mode != 1))
+		return -EINVAL;
+	mutex_lock(&data->mutex);
+	ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
+				 &data->conf.filter, gender,
+				 MMA9553_MASK_CONF_MALE);
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static const struct iio_event_spec mma9553_step_event = {
+	.type = IIO_EV_TYPE_CHANGE,
+	.dir = IIO_EV_DIR_NONE,
+	.mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
+};
+
+static const struct iio_event_spec mma9553_activity_events[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+				 BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_PERIOD),
+	 },
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+				 BIT(IIO_EV_INFO_VALUE) |
+				 BIT(IIO_EV_INFO_PERIOD),
+	},
+};
+
+static const char * const mma9553_calibgender_modes[] = { "male", "female" };
+
+static const struct iio_enum mma9553_calibgender_enum = {
+	.items = mma9553_calibgender_modes,
+	.num_items = ARRAY_SIZE(mma9553_calibgender_modes),
+	.get = mma9553_get_calibgender_mode,
+	.set = mma9553_set_calibgender_mode,
+};
+
+static const struct iio_chan_spec_ext_info mma9553_ext_info[] = {
+	IIO_ENUM("calibgender", IIO_SHARED_BY_TYPE, &mma9553_calibgender_enum),
+	IIO_ENUM_AVAILABLE("calibgender", &mma9553_calibgender_enum),
+	{},
+};
+
+#define MMA9553_PEDOMETER_CHANNEL(_type, _mask) {		\
+	.type = _type,						\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE)      |	\
+			      BIT(IIO_CHAN_INFO_CALIBHEIGHT) |	\
+			      _mask,				\
+	.ext_info = mma9553_ext_info,				\
+}
+
+#define MMA9553_ACTIVITY_CHANNEL(_chan2) {				\
+	.type = IIO_ACTIVITY,						\
+	.modified = 1,							\
+	.channel2 = _chan2,						\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT) |	\
+				    BIT(IIO_CHAN_INFO_ENABLE),		\
+	.event_spec = mma9553_activity_events,				\
+	.num_event_specs = ARRAY_SIZE(mma9553_activity_events),		\
+	.ext_info = mma9553_ext_info,					\
+}
+
+static const struct iio_chan_spec mma9553_channels[] = {
+	MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
+	MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
+	MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
+
+	{
+		.type = IIO_STEPS,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+				     BIT(IIO_CHAN_INFO_ENABLE) |
+				     BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
+				     BIT(IIO_CHAN_INFO_DEBOUNCE_TIME),
+		.event_spec = &mma9553_step_event,
+		.num_event_specs = 1,
+	},
+
+	MMA9553_PEDOMETER_CHANNEL(IIO_DISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
+	{
+		.type = IIO_VELOCITY,
+		.modified = 1,
+		.channel2 = IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_INT_TIME) |
+				      BIT(IIO_CHAN_INFO_ENABLE),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT),
+		.ext_info = mma9553_ext_info,
+	},
+	MMA9553_PEDOMETER_CHANNEL(IIO_ENERGY, BIT(IIO_CHAN_INFO_RAW) |
+				  BIT(IIO_CHAN_INFO_SCALE) |
+				  BIT(IIO_CHAN_INFO_CALIBWEIGHT)),
+
+	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
+	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_JOGGING),
+	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
+	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_STILL),
+};
+
+static const struct iio_info mma9553_info = {
+	.read_raw = mma9553_read_raw,
+	.write_raw = mma9553_write_raw,
+	.read_event_config = mma9553_read_event_config,
+	.write_event_config = mma9553_write_event_config,
+	.read_event_value = mma9553_read_event_value,
+	.write_event_value = mma9553_write_event_value,
+};
+
+static irqreturn_t mma9553_irq_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct mma9553_data *data = iio_priv(indio_dev);
+
+	data->timestamp = iio_get_time_ns(indio_dev);
+	/*
+	 * Since we only configure the interrupt pin when an
+	 * event is enabled, we are sure we have at least
+	 * one event enabled at this point.
+	 */
+	return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t mma9553_event_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct mma9553_data *data = iio_priv(indio_dev);
+	u16 stepcnt;
+	u8 activity;
+	struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
+	int ret;
+
+	mutex_lock(&data->mutex);
+	ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
+	if (ret < 0) {
+		mutex_unlock(&data->mutex);
+		return IRQ_HANDLED;
+	}
+
+	ev_prev_activity = mma9553_get_event(data, IIO_ACTIVITY,
+					     mma9553_activity_to_mod(
+					     data->activity),
+					     IIO_EV_DIR_FALLING);
+	ev_activity = mma9553_get_event(data, IIO_ACTIVITY,
+					mma9553_activity_to_mod(activity),
+					IIO_EV_DIR_RISING);
+	ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
+					   IIO_EV_DIR_NONE);
+
+	if (ev_step_detect->enabled && (stepcnt != data->stepcnt)) {
+		data->stepcnt = stepcnt;
+		iio_push_event(indio_dev,
+			       IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
+					      IIO_EV_DIR_NONE,
+					      IIO_EV_TYPE_CHANGE, 0, 0, 0),
+			       data->timestamp);
+	}
+
+	if (activity != data->activity) {
+		data->activity = activity;
+		/* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
+		if (ev_prev_activity && ev_prev_activity->enabled)
+			iio_push_event(indio_dev,
+				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
+						    ev_prev_activity->info->mod,
+						    IIO_EV_DIR_FALLING,
+						    IIO_EV_TYPE_THRESH, 0, 0,
+						    0),
+				       data->timestamp);
+
+		if (ev_activity && ev_activity->enabled)
+			iio_push_event(indio_dev,
+				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
+						      ev_activity->info->mod,
+						      IIO_EV_DIR_RISING,
+						      IIO_EV_TYPE_THRESH, 0, 0,
+						      0),
+				       data->timestamp);
+	}
+	mutex_unlock(&data->mutex);
+
+	return IRQ_HANDLED;
+}
+
+static const char *mma9553_match_acpi_device(struct device *dev)
+{
+	const struct acpi_device_id *id;
+
+	id = acpi_match_device(dev->driver->acpi_match_table, dev);
+	if (!id)
+		return NULL;
+
+	return dev_name(dev);
+}
+
+static int mma9553_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct mma9553_data *data;
+	struct iio_dev *indio_dev;
+	const char *name = NULL;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+
+	if (id)
+		name = id->name;
+	else if (ACPI_HANDLE(&client->dev))
+		name = mma9553_match_acpi_device(&client->dev);
+	else
+		return -ENOSYS;
+
+	mutex_init(&data->mutex);
+	mma9553_init_events(data);
+
+	ret = mma9553_init(data);
+	if (ret < 0)
+		return ret;
+
+	indio_dev->channels = mma9553_channels;
+	indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
+	indio_dev->name = name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &mma9553_info;
+
+	if (client->irq > 0) {
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+						mma9553_irq_handler,
+						mma9553_event_handler,
+						IRQF_TRIGGER_RISING,
+						MMA9553_IRQ_NAME, indio_dev);
+		if (ret < 0) {
+			dev_err(&client->dev, "request irq %d failed\n",
+				client->irq);
+			goto out_poweroff;
+		}
+	}
+
+	ret = pm_runtime_set_active(&client->dev);
+	if (ret < 0)
+		goto out_poweroff;
+
+	pm_runtime_enable(&client->dev);
+	pm_runtime_set_autosuspend_delay(&client->dev,
+					 MMA9551_AUTO_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(&client->dev);
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0) {
+		dev_err(&client->dev, "unable to register iio device\n");
+		goto err_pm_cleanup;
+	}
+
+	dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
+	return 0;
+
+err_pm_cleanup:
+	pm_runtime_dont_use_autosuspend(&client->dev);
+	pm_runtime_disable(&client->dev);
+out_poweroff:
+	mma9551_set_device_state(client, false);
+	return ret;
+}
+
+static int mma9553_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct mma9553_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+
+	pm_runtime_disable(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
+	pm_runtime_put_noidle(&client->dev);
+
+	mutex_lock(&data->mutex);
+	mma9551_set_device_state(data->client, false);
+	mutex_unlock(&data->mutex);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int mma9553_runtime_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma9553_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->mutex);
+	ret = mma9551_set_device_state(data->client, false);
+	mutex_unlock(&data->mutex);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "powering off device failed\n");
+		return -EAGAIN;
+	}
+
+	return 0;
+}
+
+static int mma9553_runtime_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma9553_data *data = iio_priv(indio_dev);
+	int ret;
+
+	ret = mma9551_set_device_state(data->client, true);
+	if (ret < 0)
+		return ret;
+
+	mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
+
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_PM_SLEEP
+static int mma9553_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma9553_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->mutex);
+	ret = mma9551_set_device_state(data->client, false);
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+
+static int mma9553_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma9553_data *data = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->mutex);
+	ret = mma9551_set_device_state(data->client, true);
+	mutex_unlock(&data->mutex);
+
+	return ret;
+}
+#endif
+
+static const struct dev_pm_ops mma9553_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
+	SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
+			   mma9553_runtime_resume, NULL)
+};
+
+static const struct acpi_device_id mma9553_acpi_match[] = {
+	{"MMA9553", 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
+
+static const struct i2c_device_id mma9553_id[] = {
+	{"mma9553", 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(i2c, mma9553_id);
+
+static struct i2c_driver mma9553_driver = {
+	.driver = {
+		   .name = MMA9553_DRV_NAME,
+		   .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
+		   .pm = &mma9553_pm_ops,
+		   },
+	.probe = mma9553_probe,
+	.remove = mma9553_remove,
+	.id_table = mma9553_id,
+};
+
+module_i2c_driver(mma9553_driver);
+
+MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MMA9553L pedometer platform driver");