pmaports/device/testing/linux-nokia-n9/0009-misc-apds990x-convert-to-iio.patch

From 2a57f7d84874c3b7ec1b6faf69e376bf75c18636 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Filip=20Matijevi=C4=87?= <filip.matijevic.pz@gmail.com>
Date: Sat, 10 Feb 2018 21:28:19 +0100
Subject: [PATCH 09/11] misc: apds990x: convert to iio
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Filip Matijević <filip.matijevic.pz@gmail.com>
---
 drivers/misc/apds990x.c | 959 +++++++++++++++++++++-------------------
 1 file changed, 493 insertions(+), 466 deletions(-)

diff --git a/drivers/misc/apds990x.c b/drivers/misc/apds990x.c
index 7bb9cd76110a..363a6bf85a6c 100644
--- a/drivers/misc/apds990x.c
+++ b/drivers/misc/apds990x.c
@@ -1,4 +1,5 @@
 /*
+ *
  * This file is part of the APDS990x sensor driver.
  * Chip is combined proximity and ambient light sensor.
  *
@@ -35,6 +36,12 @@
 #include <linux/platform_data/apds990x.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+#define APDS990X_DRV_NAME	"apds990x"
+#define APDS990X_SLEEP_DELAY_MS 3000
 
 /* Register map */
 #define APDS990X_ENABLE	 0x00 /* Enable of states and interrupts */
@@ -130,10 +137,12 @@ struct apds990x_chip {
 	struct i2c_client		*client;
 	struct mutex			mutex; /* avoid parallel access */
 	struct regulator_bulk_data	regs[2];
-	wait_queue_head_t		wait;
+	wait_queue_head_t		wait_lux;
+	wait_queue_head_t		wait_prox;
 
-	int	prox_en;
-	bool	prox_continuous_mode;
+	bool    lux_en;
+	bool    prox_en;
+	bool	prox_wait_fresh_res;
 	bool	lux_wait_fresh_res;
 
 	/* Chip parameters */
@@ -207,7 +216,6 @@ static int apds990x_read_byte(struct apds990x_chip *chip, u8 reg, u8 *data)
 
 	reg &= ~APDS990x_CMD_TYPE_MASK;
 	reg |= APDS990x_CMD | APDS990x_CMD_TYPE_RB;
-
 	ret = i2c_smbus_read_byte_data(client, reg);
 	*data = ret;
 	return (int)ret;
@@ -233,7 +241,6 @@ static int apds990x_write_byte(struct apds990x_chip *chip, u8 reg, u8 data)
 
 	reg &= ~APDS990x_CMD_TYPE_MASK;
 	reg |= APDS990x_CMD | APDS990x_CMD_TYPE_RB;
-
 	ret = i2c_smbus_write_byte_data(client, reg, data);
 	return (int)ret;
 }
@@ -250,18 +257,6 @@ static int apds990x_write_word(struct apds990x_chip *chip, u8 reg, u16 data)
 	return (int)ret;
 }
 
-static int apds990x_mode_on(struct apds990x_chip *chip)
-{
-	/* ALS is mandatory, proximity optional */
-	u8 reg = APDS990X_EN_AIEN | APDS990X_EN_PON | APDS990X_EN_AEN |
-		APDS990X_EN_WEN;
-
-	if (chip->prox_en)
-		reg |= APDS990X_EN_PIEN | APDS990X_EN_PEN;
-
-	return apds990x_write_byte(chip, APDS990X_ENABLE, reg);
-}
-
 static u16 apds990x_lux_to_threshold(struct apds990x_chip *chip, u32 lux)
 {
 	u32 thres;
@@ -346,10 +341,7 @@ static int apds990x_refresh_pthres(struct apds990x_chip *chip, int data)
 		hi = chip->prox_thres;
 	} else {
 		lo = chip->prox_thres - APDS_PROX_HYSTERESIS;
-		if (chip->prox_continuous_mode)
-			hi = chip->prox_thres;
-		else
-			hi = APDS_RANGE;
+		hi = APDS_RANGE;
 	}
 
 	ret = apds990x_write_word(chip, APDS990X_PILTL, lo);
@@ -490,8 +482,10 @@ static int apds990x_ack_int(struct apds990x_chip *chip, u8 mode)
 
 static irqreturn_t apds990x_irq(int irq, void *data)
 {
-	struct apds990x_chip *chip = data;
+	struct iio_dev *indio_dev = data;
+	struct apds990x_chip *chip = iio_priv(indio_dev);
 	u8 status;
+	int ev_dir = IIO_EV_DIR_EITHER;
 
 	apds990x_read_byte(chip, APDS990X_STATUS, &status);
 	apds990x_ack_int(chip, status);
@@ -514,14 +508,25 @@ static irqreturn_t apds990x_irq(int irq, void *data)
 				/* Result is valid */
 				chip->lux = chip->lux_raw;
 				chip->lux_wait_fresh_res = false;
-				wake_up(&chip->wait);
-				sysfs_notify(&chip->client->dev.kobj,
-					NULL, "lux0_input");
+				wake_up(&chip->wait_lux);
+				if (chip->lux_en) {
+					if (chip->lux < chip->lux_thres_lo) {
+						ev_dir = IIO_EV_DIR_FALLING;
+					} else if (chip->lux > chip->lux_thres_hi) {
+						ev_dir = IIO_EV_DIR_RISING;
+					}
+					iio_push_event(indio_dev,
+								IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
+													IIO_EV_TYPE_THRESH,
+													ev_dir),
+								iio_get_time_ns(indio_dev));
+				}
 			}
 		}
 
-		if ((status & APDS990X_ST_PINT) && chip->prox_en) {
+		if (status & APDS990X_ST_PINT) {
 			u16 clr_ch;
+			bool prox_ok = false;
 
 			apds990x_read_word(chip, APDS990X_CDATAL, &clr_ch);
 			/*
@@ -529,27 +534,58 @@ static irqreturn_t apds990x_irq(int irq, void *data)
 			 * proximity gives false posivite values.
 			 * Just ignore them.
 			 */
-			if (chip->again_meas == 0 &&
-				clr_ch == chip->a_max_result)
+			if ((chip->again_meas == 0)
+					&& (clr_ch == chip->a_max_result)) {
 				chip->prox_data = 0;
-			else
+			} else {
+				prox_ok = true;
 				apds990x_read_word(chip,
 						APDS990X_PDATAL,
 						&chip->prox_data);
+				if (chip->prox_data < chip->prox_thres) {
+					chip->prox_data = 0;
+					ev_dir = IIO_EV_DIR_FALLING;
+				} else {
+					chip->prox_data = APDS_PROX_RANGE;
+					ev_dir = IIO_EV_DIR_RISING;
+				}
+				chip->prox_wait_fresh_res = false;
+				wake_up(&chip->wait_prox);
+			}
 
 			apds990x_refresh_pthres(chip, chip->prox_data);
-			if (chip->prox_data < chip->prox_thres)
-				chip->prox_data = 0;
-			else if (!chip->prox_continuous_mode)
-				chip->prox_data = APDS_PROX_RANGE;
-			sysfs_notify(&chip->client->dev.kobj,
-				NULL, "prox0_raw");
+			if (prox_ok && chip->prox_en) {
+				iio_push_event(indio_dev,
+							IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+												IIO_EV_TYPE_THRESH,
+												ev_dir),
+							iio_get_time_ns(indio_dev));
+			}
 		}
 	}
 	mutex_unlock(&chip->mutex);
 	return IRQ_HANDLED;
 }
 
+static int apds990x_set_mode(struct apds990x_chip *chip)
+{
+	u8 reg = 0;
+
+	if (pm_runtime_suspended(&chip->client->dev))
+		return 0;
+
+	if (chip->lux_en || chip->lux_wait_fresh_res
+	    || chip->prox_en || chip->prox_wait_fresh_res) {
+		reg = APDS990X_EN_PON | APDS990X_EN_WEN;
+		if (chip->lux_en || chip->lux_wait_fresh_res)
+			reg |= APDS990X_EN_AIEN | APDS990X_EN_AEN;
+
+		if (chip->prox_en || chip->prox_wait_fresh_res)
+			reg |= APDS990X_EN_PIEN | APDS990X_EN_PEN;
+	}
+	return apds990x_write_byte(chip, APDS990X_ENABLE, reg);
+}
+
 static int apds990x_configure(struct apds990x_chip *chip)
 {
 	/* It is recommended to use disabled mode during these operations */
@@ -577,6 +613,7 @@ static int apds990x_configure(struct apds990x_chip *chip)
 			(chip->pdiode << 4) |
 			(chip->pgain << 2) |
 			(chip->again_next << 0));
+
 	return 0;
 }
 
@@ -611,106 +648,8 @@ static int apds990x_detect(struct apds990x_chip *chip)
 	return ret;
 }
 
-#ifdef CONFIG_PM
-static int apds990x_chip_on(struct apds990x_chip *chip)
-{
-	int err	 = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
-					chip->regs);
-	if (err < 0)
-		return err;
-
-	usleep_range(APDS_STARTUP_DELAY, 2 * APDS_STARTUP_DELAY);
-
-	/* Refresh all configs in case of regulators were off */
-	chip->prox_data = 0;
-	apds990x_configure(chip);
-	apds990x_mode_on(chip);
-	return 0;
-}
-#endif
-
-static int apds990x_chip_off(struct apds990x_chip *chip)
-{
-	apds990x_write_byte(chip, APDS990X_ENABLE, APDS990X_EN_DISABLE_ALL);
-	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
-	return 0;
-}
-
-static ssize_t apds990x_lux_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	struct apds990x_chip *chip = dev_get_drvdata(dev);
-	ssize_t ret;
-	u32 result;
-	long timeout;
-
-	if (pm_runtime_suspended(dev))
-		return -EIO;
-
-	timeout = wait_event_interruptible_timeout(chip->wait,
-						!chip->lux_wait_fresh_res,
-						msecs_to_jiffies(APDS_TIMEOUT));
-	if (!timeout)
-		return -EIO;
-
-	mutex_lock(&chip->mutex);
-	result = (chip->lux * chip->lux_calib) / APDS_CALIB_SCALER;
-	if (result > (APDS_RANGE * APDS990X_LUX_OUTPUT_SCALE))
-		result = APDS_RANGE * APDS990X_LUX_OUTPUT_SCALE;
-
-	ret = sprintf(buf, "%d.%d\n",
-		result / APDS990X_LUX_OUTPUT_SCALE,
-		result % APDS990X_LUX_OUTPUT_SCALE);
-	mutex_unlock(&chip->mutex);
-	return ret;
-}
-
-static DEVICE_ATTR(lux0_input, S_IRUGO, apds990x_lux_show, NULL);
-
-static ssize_t apds990x_lux_range_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%u\n", APDS_RANGE);
-}
-
-static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, apds990x_lux_range_show, NULL);
-
-static ssize_t apds990x_lux_calib_format_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%u\n", APDS_CALIB_SCALER);
-}
-
-static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
-		apds990x_lux_calib_format_show, NULL);
-
-static ssize_t apds990x_lux_calib_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	struct apds990x_chip *chip = dev_get_drvdata(dev);
-
-	return sprintf(buf, "%u\n", chip->lux_calib);
-}
-
-static ssize_t apds990x_lux_calib_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
-{
-	struct apds990x_chip *chip = dev_get_drvdata(dev);
-	unsigned long value;
-	int ret;
-
-	ret = kstrtoul(buf, 0, &value);
-	if (ret)
-		return ret;
-
-	chip->lux_calib = value;
-
-	return len;
-}
-
-static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, apds990x_lux_calib_show,
-		apds990x_lux_calib_store);
+static IIO_CONST_ATTR(intensity_calibscale_default,
+						__stringify(APDS_CALIB_SCALER));
 
 static ssize_t apds990x_rate_avail(struct device *dev,
 				   struct device_attribute *attr, char *buf)
@@ -724,13 +663,8 @@ static ssize_t apds990x_rate_avail(struct device *dev,
 	return pos;
 }
 
-static ssize_t apds990x_rate_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
-
-	return sprintf(buf, "%d\n", chip->arate);
-}
+static IIO_DEVICE_ATTR(intensity_rate_avail, S_IRUGO,
+						apds990x_rate_avail, NULL, 0);
 
 static int apds990x_set_arate(struct apds990x_chip *chip, int rate)
 {
@@ -757,315 +691,420 @@ static int apds990x_set_arate(struct apds990x_chip *chip, int rate)
 			(chip->prox_persistence << APDS990X_PPERS_SHIFT));
 }
 
-static ssize_t apds990x_rate_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
+static ssize_t apds990x_set_lux_thresh(struct apds990x_chip *chip,
+				u32 *target, unsigned long thresh)
 {
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
-	unsigned long value;
-	int ret;
 
-	ret = kstrtoul(buf, 0, &value);
-	if (ret)
-		return ret;
+	if (thresh > APDS_RANGE)
+		return -EINVAL;
 
 	mutex_lock(&chip->mutex);
-	ret = apds990x_set_arate(chip, value);
+	*target = thresh;
+	/*
+	 * Don't update values in HW if we are still waiting for
+	 * first interrupt to come after device handle open call.
+	 */
+	if (!chip->lux_wait_fresh_res)
+		apds990x_refresh_athres(chip);
 	mutex_unlock(&chip->mutex);
-
-	if (ret < 0)
-		return ret;
-	return len;
+	return 0;
 }
 
-static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, apds990x_rate_avail, NULL);
-
-static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, apds990x_rate_show,
-						 apds990x_rate_store);
-
-static ssize_t apds990x_prox_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
+static int apds990x_set_prox_thresh(struct apds990x_chip *chip,
+									u32 thresh)
 {
-	ssize_t ret;
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
 
-	if (pm_runtime_suspended(dev) || !chip->prox_en)
-		return -EIO;
+	if ((thresh > APDS_RANGE) || (thresh == 0) ||
+		(thresh < APDS_PROX_HYSTERESIS))
+		return -EINVAL;
 
 	mutex_lock(&chip->mutex);
-	ret = sprintf(buf, "%d\n", chip->prox_data);
-	mutex_unlock(&chip->mutex);
-	return ret;
-}
-
-static DEVICE_ATTR(prox0_raw, S_IRUGO, apds990x_prox_show, NULL);
+	chip->prox_thres = thresh;
 
-static ssize_t apds990x_prox_range_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%u\n", APDS_PROX_RANGE);
+	apds990x_force_p_refresh(chip);
+	mutex_unlock(&chip->mutex);
+	return 0;
 }
 
-static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, apds990x_prox_range_show, NULL);
-
-static ssize_t apds990x_prox_enable_show(struct device *dev,
+static ssize_t apds990x_chip_id_show(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct apds990x_chip *chip = iio_priv(indio_dev);
 
-	return sprintf(buf, "%d\n", chip->prox_en);
+	return sprintf(buf, "%s %d\n", chip->chipname, chip->revision);
 }
 
-static ssize_t apds990x_prox_enable_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
-	unsigned long value;
-	int ret;
-
-	ret = kstrtoul(buf, 0, &value);
-	if (ret)
-		return ret;
+static IIO_DEVICE_ATTR(chip_id, S_IRUGO,
+						apds990x_chip_id_show, NULL, 0);
 
-	mutex_lock(&chip->mutex);
+#define APDS990X_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
+#define APDS990X_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
 
-	if (!chip->prox_en)
-		chip->prox_data = 0;
+static struct attribute *sysfs_attrs_ctrl[] = {
+	APDS990X_CONST_ATTR(intensity_calibscale_default),
+	APDS990X_DEV_ATTR(intensity_rate_avail),
+	APDS990X_DEV_ATTR(chip_id),
+	NULL,
+};
 
-	if (value)
-		chip->prox_en++;
-	else if (chip->prox_en > 0)
-		chip->prox_en--;
+static struct attribute_group apds990x_attribute_group = {
+	.attrs = sysfs_attrs_ctrl,
+};
 
-	if (!pm_runtime_suspended(dev))
-		apds990x_mode_on(chip);
-	mutex_unlock(&chip->mutex);
-	return len;
-}
+static const struct iio_event_spec apds990x_lux_event_spec[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+						 BIT(IIO_EV_INFO_ENABLE),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+						 BIT(IIO_EV_INFO_ENABLE),
+	},
+};
 
-static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, apds990x_prox_enable_show,
-						   apds990x_prox_enable_store);
+static const struct iio_event_spec apds990x_prox_event_spec[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_EITHER,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+						 BIT(IIO_EV_INFO_ENABLE),
+	},
+};
 
-static const char *reporting_modes[] = {"trigger", "periodic"};
+static const struct iio_chan_spec apds990x_channels[] = {
+	{
+		.type = IIO_INTENSITY,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+							  BIT(IIO_CHAN_INFO_SCALE) |
+							  BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+							  BIT(IIO_CHAN_INFO_CALIBSCALE),
+		.event_spec = apds990x_lux_event_spec,
+		.num_event_specs = ARRAY_SIZE(apds990x_lux_event_spec),
+	},
+	{
+		.type = IIO_PROXIMITY,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+							  BIT(IIO_CHAN_INFO_SCALE),
+		.event_spec = apds990x_prox_event_spec,
+		.num_event_specs = ARRAY_SIZE(apds990x_prox_event_spec),
+	},
+};
 
-static ssize_t apds990x_prox_reporting_mode_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
+static int apds990x_set_power_state(struct apds990x_chip *chip, bool on)
 {
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	struct device *dev = &chip->client->dev;
+	int ret = 0;
 
-	return sprintf(buf, "%s\n",
-		reporting_modes[!!chip->prox_continuous_mode]);
-}
+	mutex_lock(&chip->mutex);
+	apds990x_set_mode(chip);
 
-static ssize_t apds990x_prox_reporting_mode_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
-	int ret;
+	if (on) {
+		ret = pm_runtime_get_sync(dev);
+		if (ret < 0)
+			pm_runtime_put_noidle(dev);
+	} else {
+		pm_runtime_mark_last_busy(dev);
+		ret = pm_runtime_put_autosuspend(dev);
+	}
 
-	ret = sysfs_match_string(reporting_modes, buf);
-	if (ret < 0)
-		return ret;
+	mutex_unlock(&chip->mutex);
 
-	chip->prox_continuous_mode = ret;
-	return len;
+	return ret;
 }
 
-static DEVICE_ATTR(prox0_reporting_mode, S_IRUGO | S_IWUSR,
-		apds990x_prox_reporting_mode_show,
-		apds990x_prox_reporting_mode_store);
-
-static ssize_t apds990x_prox_reporting_avail_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
+static int apds990x_read_raw(struct iio_dev *indio_dev,
+							 struct iio_chan_spec const *chan,
+							 int *val, int *val2, long mask)
 {
-	return sprintf(buf, "%s %s\n", reporting_modes[0], reporting_modes[1]);
-}
-
-static DEVICE_ATTR(prox0_reporting_mode_avail, S_IRUGO | S_IWUSR,
-		apds990x_prox_reporting_avail_show, NULL);
+	struct apds990x_chip *chip = iio_priv(indio_dev);
+	long timeout;
+	u32 result;
+	int ret;
 
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			if (!chip->lux_en)
+				chip->lux_wait_fresh_res = true;
+			apds990x_set_power_state(chip, true);
+			if (chip->lux_wait_fresh_res) {
+				apds990x_force_a_refresh(chip);
+				timeout = wait_event_interruptible_timeout(chip->wait_lux,
+							!chip->lux_wait_fresh_res,
+							msecs_to_jiffies(APDS_TIMEOUT));
+				if (!timeout)
+					return -EIO;
+			}
 
-static ssize_t apds990x_lux_thresh_above_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+			mutex_lock(&chip->mutex);
+			result = (chip->lux * chip->lux_calib) / APDS_CALIB_SCALER;
+			if (result > (APDS_RANGE * APDS990X_LUX_OUTPUT_SCALE))
+				result = APDS_RANGE * APDS990X_LUX_OUTPUT_SCALE;
 
-	return sprintf(buf, "%d\n", chip->lux_thres_hi);
-}
+			*val = result;
+			*val2 = APDS990X_LUX_OUTPUT_SCALE;
+			ret = IIO_VAL_FRACTIONAL;
+			mutex_unlock(&chip->mutex);
+			apds990x_set_power_state(chip, false);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_PROXIMITY:
+			if (!chip->prox_en)
+				chip->prox_wait_fresh_res = true;
+			apds990x_set_power_state(chip, true);
+			if (chip->prox_wait_fresh_res) {
+				apds990x_force_p_refresh(chip);
+				timeout = wait_event_interruptible_timeout(chip->wait_prox,
+							!chip->prox_wait_fresh_res,
+							msecs_to_jiffies(APDS_TIMEOUT));
+				if (!timeout)
+					return -EIO;
+			}
 
-static ssize_t apds990x_lux_thresh_below_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+			mutex_lock(&chip->mutex);
+			*val = chip->prox_data;
+			mutex_unlock(&chip->mutex);
+			ret = IIO_VAL_INT;
+			apds990x_set_power_state(chip, false);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case IIO_CHAN_INFO_SCALE:
+		mutex_lock(&chip->mutex);
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			*val = APDS_RANGE;
+			ret = IIO_VAL_INT;
+			break;
+		case IIO_PROXIMITY:
+			*val = APDS_PROX_RANGE;
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			return -EINVAL;
+		}
+		mutex_unlock(&chip->mutex);
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			*val = chip->arate;
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case IIO_CHAN_INFO_CALIBSCALE:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			*val = chip->lux_calib;
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
 
-	return sprintf(buf, "%d\n", chip->lux_thres_lo);
+	return ret;
 }
 
-static ssize_t apds990x_set_lux_thresh(struct apds990x_chip *chip, u32 *target,
-				const char *buf)
+static int apds990x_write_raw(struct iio_dev *indio_dev,
+							  struct iio_chan_spec const *chan,
+							  int val, int val2, long mask)
 {
-	unsigned long thresh;
+	struct apds990x_chip *chip = iio_priv(indio_dev);
 	int ret;
 
-	ret = kstrtoul(buf, 0, &thresh);
-	if (ret)
-		return ret;
-
-	if (thresh > APDS_RANGE)
-		return -EINVAL;
-
 	mutex_lock(&chip->mutex);
-	*target = thresh;
-	/*
-	 * Don't update values in HW if we are still waiting for
-	 * first interrupt to come after device handle open call.
-	 */
-	if (!chip->lux_wait_fresh_res)
-		apds990x_refresh_athres(chip);
-	mutex_unlock(&chip->mutex);
-	return ret;
 
-}
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			if (val != 0) {
+				ret = -EINVAL;
+				break;
+			}
+			ret = apds990x_set_arate(chip, val2);
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	case IIO_CHAN_INFO_CALIBSCALE:
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			if (val < 0 || val > USHRT_MAX || val2 != 0){
+				ret = -EINVAL;
+				break;
+			}
+			chip->lux_calib = val;
+			ret = 0;
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
 
-static ssize_t apds990x_lux_thresh_above_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
-	int ret = apds990x_set_lux_thresh(chip, &chip->lux_thres_hi, buf);
+	mutex_unlock(&chip->mutex);
 
-	if (ret < 0)
-		return ret;
-	return len;
+	return ret;
 }
 
-static ssize_t apds990x_lux_thresh_below_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
+static int apds990x_read_event(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 apds990x_chip *chip =  dev_get_drvdata(dev);
-	int ret = apds990x_set_lux_thresh(chip, &chip->lux_thres_lo, buf);
-
-	if (ret < 0)
-		return ret;
-	return len;
-}
+	struct apds990x_chip *chip = iio_priv(indio_dev);
 
-static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
-		apds990x_lux_thresh_above_show,
-		apds990x_lux_thresh_above_store);
-
-static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
-		apds990x_lux_thresh_below_show,
-		apds990x_lux_thresh_below_store);
-
-static ssize_t apds990x_prox_threshold_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			*val = chip->lux_thres_hi;
+			break;
+		case IIO_EV_DIR_FALLING:
+			*val = chip->lux_thres_lo;
+			break;
+		default:
+			return -EINVAL;
+		}
+	case IIO_PROXIMITY:
+		*val = chip->prox_thres;
+		break;
+	default:
+		return -EINVAL;
+	}
 
-	return sprintf(buf, "%d\n", chip->prox_thres);
+	return IIO_VAL_INT;
 }
 
-static ssize_t apds990x_prox_threshold_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
+static int apds990x_write_event(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 apds990x_chip *chip =  dev_get_drvdata(dev);
-	unsigned long value;
+	struct apds990x_chip *chip = iio_priv(indio_dev);
+	u32 *thresh;
 	int ret;
 
-	ret = kstrtoul(buf, 0, &value);
-	if (ret)
-		return ret;
-
-	if ((value > APDS_RANGE) || (value == 0) ||
-		(value < APDS_PROX_HYSTERESIS))
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			thresh = &chip->lux_thres_hi;
+			break;
+		case IIO_EV_DIR_FALLING:
+			thresh = &chip->lux_thres_lo;
+			break;
+		default:
+			return -EINVAL;
+		}
+		mutex_lock(&chip->mutex);
+		ret = apds990x_set_lux_thresh(chip, thresh, val);
+		mutex_unlock(&chip->mutex);
+		break;
+	case IIO_PROXIMITY:
+		switch (dir) {
+		case IIO_EV_DIR_RISING:
+			mutex_lock(&chip->mutex);
+			ret = apds990x_set_prox_thresh(chip, val);
+			mutex_unlock(&chip->mutex);
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	default:
 		return -EINVAL;
+	}
 
-	mutex_lock(&chip->mutex);
-	chip->prox_thres = value;
-
-	apds990x_force_p_refresh(chip);
-	mutex_unlock(&chip->mutex);
-	return len;
+	return ret;
 }
 
-static DEVICE_ATTR(prox0_thresh_above_value, S_IRUGO | S_IWUSR,
-		apds990x_prox_threshold_show,
-		apds990x_prox_threshold_store);
-
-static ssize_t apds990x_power_state_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
+static int apds990x_read_event_config(struct iio_dev *indio_dev,
+					 const struct iio_chan_spec *chan,
+					 enum iio_event_type type,
+					 enum iio_event_direction dir)
 {
-	return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
+	struct apds990x_chip *chip = iio_priv(indio_dev);
+
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		return chip->lux_en;
+	case IIO_PROXIMITY:
+		return chip->prox_en;
+	default:
+		return -EINVAL;
+	}
+
 	return 0;
 }
 
-static ssize_t apds990x_power_state_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t len)
+static int apds990x_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 apds990x_chip *chip =  dev_get_drvdata(dev);
-	unsigned long value;
-	int ret;
+	struct apds990x_chip *chip = iio_priv(indio_dev);
 
-	ret = kstrtoul(buf, 0, &value);
-	if (ret)
-		return ret;
+	state = !!state;
 
-	if (value) {
-		pm_runtime_get_sync(dev);
-		mutex_lock(&chip->mutex);
-		chip->lux_wait_fresh_res = true;
-		apds990x_force_a_refresh(chip);
-		apds990x_force_p_refresh(chip);
-		mutex_unlock(&chip->mutex);
-	} else {
-		if (!pm_runtime_suspended(dev))
-			pm_runtime_put(dev);
-	}
-	return len;
-}
+	switch (chan->type) {
+	case IIO_INTENSITY:
+		if (chip->lux_en == state)
+			return -EINVAL;
 
-static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
-		apds990x_power_state_show,
-		apds990x_power_state_store);
+		chip->lux_en = state;
+		chip->lux_wait_fresh_res = true;
+		apds990x_set_mode(chip);
+		break;
+	case IIO_PROXIMITY:
+		if (chip->prox_en == state)
+			return -EINVAL;
 
-static ssize_t apds990x_chip_id_show(struct device *dev,
-				   struct device_attribute *attr, char *buf)
-{
-	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+		chip->prox_en = state;
+		chip->prox_wait_fresh_res = true;
+		apds990x_set_mode(chip);
+		break;
+	default:
+		return -EINVAL;
+	}
 
-	return sprintf(buf, "%s %d\n", chip->chipname, chip->revision);
+	return 0;
 }
 
-static DEVICE_ATTR(chip_id, S_IRUGO, apds990x_chip_id_show, NULL);
-
-static struct attribute *sysfs_attrs_ctrl[] = {
-	&dev_attr_lux0_calibscale.attr,
-	&dev_attr_lux0_calibscale_default.attr,
-	&dev_attr_lux0_input.attr,
-	&dev_attr_lux0_sensor_range.attr,
-	&dev_attr_lux0_rate.attr,
-	&dev_attr_lux0_rate_avail.attr,
-	&dev_attr_lux0_thresh_above_value.attr,
-	&dev_attr_lux0_thresh_below_value.attr,
-	&dev_attr_prox0_raw_en.attr,
-	&dev_attr_prox0_raw.attr,
-	&dev_attr_prox0_sensor_range.attr,
-	&dev_attr_prox0_thresh_above_value.attr,
-	&dev_attr_prox0_reporting_mode.attr,
-	&dev_attr_prox0_reporting_mode_avail.attr,
-	&dev_attr_chip_id.attr,
-	&dev_attr_power_state.attr,
-	NULL
-};
-
-static const struct attribute_group apds990x_attribute_group[] = {
-	{.attrs = sysfs_attrs_ctrl },
+static const struct iio_info apds990x_info = {
+	.read_raw = apds990x_read_raw,
+	.write_raw = apds990x_write_raw,
+	.read_event_value = apds990x_read_event,
+	.write_event_value = apds990x_write_event,
+	.read_event_config = apds990x_read_event_config,
+	.write_event_config = apds990x_write_event_config,
+	.attrs = &apds990x_attribute_group,
 };
 
 static const int apds990x_parse_dt(struct device *dev,
@@ -1132,16 +1171,27 @@ static int apds990x_probe(struct i2c_client *client,
 				const struct i2c_device_id *id)
 {
 	struct apds990x_chip *chip;
+	struct iio_dev *indio_dev;
 	int err = 0;
 
-	chip = kzalloc(sizeof *chip, GFP_KERNEL);
-	if (!chip)
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
+	if (!indio_dev)
 		return -ENOMEM;
 
-	i2c_set_clientdata(client, chip);
-	chip->client  = client;
+	indio_dev->info = &apds990x_info;
+	indio_dev->name = id->name;
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->channels = apds990x_channels;
+	indio_dev->num_channels = ARRAY_SIZE(apds990x_channels);
+	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	init_waitqueue_head(&chip->wait);
+	chip = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+
+	chip->client = client;
+
+	init_waitqueue_head(&chip->wait_lux);
+	init_waitqueue_head(&chip->wait_prox);
 	mutex_init(&chip->mutex);
 	chip->pdata	= client->dev.platform_data;
 
@@ -1157,8 +1207,7 @@ static int apds990x_probe(struct i2c_client *client,
 
 	if (chip->pdata == NULL) {
 		dev_err(&client->dev, "platform data is mandatory\n");
-		err = -EINVAL;
-		goto fail1;
+		return -EINVAL;
 	}
 
 	if (chip->pdata->cf.ga == 0) {
@@ -1197,22 +1246,23 @@ static int apds990x_probe(struct i2c_client *client,
 	chip->pgain = APDS_PGAIN_1X;
 	chip->prox_calib = APDS_PROX_NEUTRAL_CALIB_VALUE;
 	chip->prox_persistence = APDS_DEFAULT_PROX_PERS;
-	chip->prox_continuous_mode = false;
 
 	chip->regs[0].supply = reg_vcc;
 	chip->regs[1].supply = reg_vled;
 
-	err = regulator_bulk_get(&client->dev,
+	chip->lux_en = true;
+
+	err = devm_regulator_bulk_get(&client->dev,
 				 ARRAY_SIZE(chip->regs), chip->regs);
 	if (err < 0) {
 		dev_err(&client->dev, "Cannot get regulators\n");
-		goto fail1;
+		return err;
 	}
 
 	err = regulator_bulk_enable(ARRAY_SIZE(chip->regs), chip->regs);
 	if (err < 0) {
 		dev_err(&client->dev, "Cannot enable regulators\n");
-		goto fail2;
+		return err;
 	}
 
 	usleep_range(APDS_STARTUP_DELAY, 2 * APDS_STARTUP_DELAY);
@@ -1220,141 +1270,119 @@ static int apds990x_probe(struct i2c_client *client,
 	err = apds990x_detect(chip);
 	if (err < 0) {
 		dev_err(&client->dev, "APDS990X not found\n");
-		goto fail3;
+		goto fail1;
 	}
 
-	pm_runtime_set_active(&client->dev);
-
-	apds990x_configure(chip);
-	apds990x_set_arate(chip, APDS_LUX_DEFAULT_RATE);
-	apds990x_mode_on(chip);
-
 	pm_runtime_enable(&client->dev);
+	pm_runtime_set_autosuspend_delay(&client->dev,
+									APDS990X_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(&client->dev);
 
 	if (chip->pdata->setup_resources) {
 		err = chip->pdata->setup_resources();
 		if (err) {
 			err = -EINVAL;
-			goto fail3;
+			goto fail1;
 		}
 	}
 
-	err = sysfs_create_group(&chip->client->dev.kobj,
-				apds990x_attribute_group);
-	if (err < 0) {
-		dev_err(&chip->client->dev, "Sysfs registration failed\n");
-		goto fail4;
-	}
-
-	err = request_threaded_irq(client->irq, NULL,
-				apds990x_irq,
-				IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW |
-				IRQF_ONESHOT,
-				"apds990x", chip);
+	err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+				apds990x_irq, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW |
+				IRQF_ONESHOT, "apds990x", indio_dev);
 	if (err) {
 		dev_err(&client->dev, "could not get IRQ %d\n",
 			client->irq);
-		goto fail5;
+		goto fail2;
 	}
-	return err;
-fail5:
-	sysfs_remove_group(&chip->client->dev.kobj,
-			&apds990x_attribute_group[0]);
-fail4:
+
+	err = devm_iio_device_register(&client->dev, indio_dev);
+	if (err)
+		goto fail2;
+
+	return 0;
+fail2:
 	if (chip->pdata && chip->pdata->release_resources)
 		chip->pdata->release_resources();
-fail3:
-	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
-fail2:
-	regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
 fail1:
-	kfree(chip);
+	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
+
 	return err;
 }
 
 static int apds990x_remove(struct i2c_client *client)
 {
-	struct apds990x_chip *chip = i2c_get_clientdata(client);
-
-	free_irq(client->irq, chip);
-	sysfs_remove_group(&chip->client->dev.kobj,
-			apds990x_attribute_group);
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct apds990x_chip *chip = iio_priv(indio_dev);
 
 	if (chip->pdata && chip->pdata->release_resources)
 		chip->pdata->release_resources();
 
-	if (!pm_runtime_suspended(&client->dev))
-		apds990x_chip_off(chip);
-
 	pm_runtime_disable(&client->dev);
 	pm_runtime_set_suspended(&client->dev);
+	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
 
-	regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
-
-	kfree(chip);
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int apds990x_suspend(struct device *dev)
+static int apds990x_set_power(struct apds990x_chip *chip, bool on)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct apds990x_chip *chip = i2c_get_clientdata(client);
+	int ret = 0;
 
-	apds990x_chip_off(chip);
-	return 0;
-}
+	if (on) {
+		ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
+					chip->regs);
+		if (ret < 0)
+			return ret;
 
-static int apds990x_resume(struct device *dev)
-{
-	struct i2c_client *client = to_i2c_client(dev);
-	struct apds990x_chip *chip = i2c_get_clientdata(client);
+		usleep_range(APDS_STARTUP_DELAY, 2 * APDS_STARTUP_DELAY);
 
-	/*
-	 * If we were enabled at suspend time, it is expected
-	 * everything works nice and smoothly. Chip_on is enough
-	 */
-	apds990x_chip_on(chip);
+		apds990x_configure(chip);
+		apds990x_set_arate(chip, APDS_LUX_DEFAULT_RATE);
 
-	return 0;
+		chip->lux_wait_fresh_res = true;
+		chip->prox_wait_fresh_res = true;
+
+		apds990x_set_mode(chip);
+
+	} else {
+		ret = regulator_bulk_disable(ARRAY_SIZE(chip->regs),
+					chip->regs);
+	}
+
+	return ret;
 }
-#endif
 
-#ifdef CONFIG_PM
 static int apds990x_runtime_suspend(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct apds990x_chip *chip = i2c_get_clientdata(client);
+	struct apds990x_chip *chip =
+					iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 
-	apds990x_chip_off(chip);
+	apds990x_set_power(chip, false);
 	return 0;
 }
 
 static int apds990x_runtime_resume(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct apds990x_chip *chip = i2c_get_clientdata(client);
+	struct apds990x_chip *chip =
+					iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
 
-	apds990x_chip_on(chip);
+	apds990x_set_power(chip, true);
 	return 0;
 }
 
-#endif
+static const struct dev_pm_ops apds990x_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(apds990x_runtime_suspend,
+							apds990x_runtime_resume)
+	SET_RUNTIME_PM_OPS(apds990x_runtime_suspend,
+					   apds990x_runtime_resume, NULL)
+};
 
 static const struct i2c_device_id apds990x_id[] = {
 	{"apds990x", 0 },
 	{}
 };
-
 MODULE_DEVICE_TABLE(i2c, apds990x_id);
 
-static const struct dev_pm_ops apds990x_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(apds990x_suspend, apds990x_resume)
-	SET_RUNTIME_PM_OPS(apds990x_runtime_suspend,
-			apds990x_runtime_resume,
-			NULL)
-};
-
 static const struct of_device_id apds990x_of_match[] = {
 	{.compatible = "avago,apds990x" },
 	{}
@@ -1363,7 +1391,7 @@ MODULE_DEVICE_TABLE(of, apds990x_of_match);
 
 static struct i2c_driver apds990x_driver = {
 	.driver	 = {
-		.name	= "apds990x",
+		.name	= APDS990X_DRV_NAME,
 		.of_match_table	= apds990x_of_match,
 		.pm	= &apds990x_pm_ops,
 	},
@@ -1371,7 +1399,6 @@ static struct i2c_driver apds990x_driver = {
 	.remove	  = apds990x_remove,
 	.id_table = apds990x_id,
 };
-
 module_i2c_driver(apds990x_driver);
 
 MODULE_DESCRIPTION("APDS990X combined ALS and proximity sensor");
-- 
2.17.0