drivers/misc: driver for APDS990X ALS and proximity sensors

This is a driver for Avago APDS990X combined ALS and proximity sensor.

Interface is sysfs based. The driver uses interrupts to provide new data.
The driver supports pm_runtime and regulator frameworks.

See Documentation/misc-devices/apds990x.txt for details

Signed-off-by: Samu Onkalo <[e-mail]>
Acked-by: Jonathan Cameron <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/misc/Kconfig

···
            To compile this driver as a module, choose M here: the
            module will be called bh1770glc. If unsure, say N here.
 
+config SENSORS_APDS990X
+	 tristate "APDS990X combined als and proximity sensors"
+	 depends on I2C
+	 default n
+	 ---help---
+	   Say Y here if you want to build a driver for Avago APDS990x
+	   combined ambient light and proximity sensor chip.
+
+	   To compile this driver as a module, choose M here: the
+	   module will be called apds990x. If unsure, say N here.
+
 config HMC6352
 	tristate "Honeywell HMC6352 compass"
 	depends on I2C

drivers/misc/Makefile

···
 obj-$(CONFIG_PHANTOM)		+= phantom.o
 obj-$(CONFIG_SENSORS_BH1780)	+= bh1780gli.o
 obj-$(CONFIG_SENSORS_BH1770)	+= bh1770glc.o
+obj-$(CONFIG_SENSORS_APDS990X)	+= apds990x.o
 obj-$(CONFIG_SGI_IOC4)		+= ioc4.o
 obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
 obj-$(CONFIG_KGDB_TESTS)	+= kgdbts.o

drivers/misc/apds990x.c

···
+/*
+ * This file is part of the APDS990x sensor driver.
+ * Chip is combined proximity and ambient light sensor.
+ *
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Samu Onkalo <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <linux/i2c/apds990x.h>
+
+/* Register map */
+#define APDS990X_ENABLE	 0x00 /* Enable of states and interrupts */
+#define APDS990X_ATIME	 0x01 /* ALS ADC time  */
+#define APDS990X_PTIME	 0x02 /* Proximity ADC time  */
+#define APDS990X_WTIME	 0x03 /* Wait time  */
+#define APDS990X_AILTL	 0x04 /* ALS interrupt low threshold low byte */
+#define APDS990X_AILTH	 0x05 /* ALS interrupt low threshold hi byte */
+#define APDS990X_AIHTL	 0x06 /* ALS interrupt hi threshold low byte */
+#define APDS990X_AIHTH	 0x07 /* ALS interrupt hi threshold hi byte */
+#define APDS990X_PILTL	 0x08 /* Proximity interrupt low threshold low byte */
+#define APDS990X_PILTH	 0x09 /* Proximity interrupt low threshold hi byte */
+#define APDS990X_PIHTL	 0x0a /* Proximity interrupt hi threshold low byte */
+#define APDS990X_PIHTH	 0x0b /* Proximity interrupt hi threshold hi byte */
+#define APDS990X_PERS	 0x0c /* Interrupt persistence filters */
+#define APDS990X_CONFIG	 0x0d /* Configuration */
+#define APDS990X_PPCOUNT 0x0e /* Proximity pulse count */
+#define APDS990X_CONTROL 0x0f /* Gain control register */
+#define APDS990X_REV	 0x11 /* Revision Number */
+#define APDS990X_ID	 0x12 /* Device ID */
+#define APDS990X_STATUS	 0x13 /* Device status */
+#define APDS990X_CDATAL	 0x14 /* Clear ADC low data register */
+#define APDS990X_CDATAH	 0x15 /* Clear ADC high data register */
+#define APDS990X_IRDATAL 0x16 /* IR ADC low data register */
+#define APDS990X_IRDATAH 0x17 /* IR ADC high data register */
+#define APDS990X_PDATAL	 0x18 /* Proximity ADC low data register */
+#define APDS990X_PDATAH	 0x19 /* Proximity ADC high data register */
+
+/* Control */
+#define APDS990X_MAX_AGAIN	3
+
+/* Enable register */
+#define APDS990X_EN_PIEN	(0x1 << 5)
+#define APDS990X_EN_AIEN	(0x1 << 4)
+#define APDS990X_EN_WEN		(0x1 << 3)
+#define APDS990X_EN_PEN		(0x1 << 2)
+#define APDS990X_EN_AEN		(0x1 << 1)
+#define APDS990X_EN_PON		(0x1 << 0)
+#define APDS990X_EN_DISABLE_ALL 0
+
+/* Status register */
+#define APDS990X_ST_PINT	(0x1 << 5)
+#define APDS990X_ST_AINT	(0x1 << 4)
+
+/* I2C access types */
+#define APDS990x_CMD_TYPE_MASK	(0x03 << 5)
+#define APDS990x_CMD_TYPE_RB	(0x00 << 5) /* Repeated byte */
+#define APDS990x_CMD_TYPE_INC	(0x01 << 5) /* Auto increment */
+#define APDS990x_CMD_TYPE_SPE	(0x03 << 5) /* Special function */
+
+#define APDS990x_ADDR_SHIFT	0
+#define APDS990x_CMD		0x80
+
+/* Interrupt ack commands */
+#define APDS990X_INT_ACK_ALS	0x6
+#define APDS990X_INT_ACK_PS	0x5
+#define APDS990X_INT_ACK_BOTH	0x7
+
+/* ptime */
+#define APDS990X_PTIME_DEFAULT	0xff /* Recommended conversion time 2.7ms*/
+
+/* wtime */
+#define APDS990X_WTIME_DEFAULT	0xee /* ~50ms wait time */
+
+#define APDS990X_TIME_TO_ADC	1024 /* One timetick as ADC count value */
+
+/* Persistence */
+#define APDS990X_APERS_SHIFT	0
+#define APDS990X_PPERS_SHIFT	4
+
+/* Supported ID:s */
+#define APDS990X_ID_0		0x0
+#define APDS990X_ID_4		0x4
+#define APDS990X_ID_29		0x29
+
+/* pgain and pdiode settings */
+#define APDS_PGAIN_1X	       0x0
+#define APDS_PDIODE_IR	       0x2
+
+#define APDS990X_LUX_OUTPUT_SCALE 10
+
+/* Reverse chip factors for threshold calculation */
+struct reverse_factors {
+	u32 afactor;
+	int cf1;
+	int irf1;
+	int cf2;
+	int irf2;
+};
+
+struct apds990x_chip {
+	struct apds990x_platform_data	*pdata;
+	struct i2c_client		*client;
+	struct mutex			mutex; /* avoid parallel access */
+	struct regulator_bulk_data	regs[2];
+	wait_queue_head_t		wait;
+
+	int	prox_en;
+	bool	prox_continuous_mode;
+	bool	lux_wait_fresh_res;
+
+	/* Chip parameters */
+	struct	apds990x_chip_factors	cf;
+	struct	reverse_factors		rcf;
+	u16	atime;		/* als integration time */
+	u16	arate;		/* als reporting rate */
+	u16	a_max_result;	/* Max possible ADC value with current atime */
+	u8	again_meas;	/* Gain used in last measurement */
+	u8	again_next;	/* Next calculated gain */
+	u8	pgain;
+	u8	pdiode;
+	u8	pdrive;
+	u8	lux_persistence;
+	u8	prox_persistence;
+
+	u32	lux_raw;
+	u32	lux;
+	u16	lux_clear;
+	u16	lux_ir;
+	u16	lux_calib;
+	u32	lux_thres_hi;
+	u32	lux_thres_lo;
+
+	u32	prox_thres;
+	u16	prox_data;
+	u16	prox_calib;
+
+	char	chipname[10];
+	u8	revision;
+};
+
+#define APDS_CALIB_SCALER		8192
+#define APDS_LUX_NEUTRAL_CALIB_VALUE	(1 * APDS_CALIB_SCALER)
+#define APDS_PROX_NEUTRAL_CALIB_VALUE	(1 * APDS_CALIB_SCALER)
+
+#define APDS_PROX_DEF_THRES		600
+#define APDS_PROX_HYSTERESIS		50
+#define APDS_LUX_DEF_THRES_HI		101
+#define APDS_LUX_DEF_THRES_LO		100
+#define APDS_DEFAULT_PROX_PERS		1
+
+#define APDS_TIMEOUT			2000
+#define APDS_STARTUP_DELAY		25000 /* us */
+#define APDS_RANGE			65535
+#define APDS_PROX_RANGE			1023
+#define APDS_LUX_GAIN_LO_LIMIT		100
+#define APDS_LUX_GAIN_LO_LIMIT_STRICT	25
+
+#define TIMESTEP			87 /* 2.7ms is about 87 / 32 */
+#define TIME_STEP_SCALER		32
+
+#define APDS_LUX_AVERAGING_TIME		50 /* tolerates 50/60Hz ripple */
+#define APDS_LUX_DEFAULT_RATE		200
+
+static const u8 again[]	= {1, 8, 16, 120}; /* ALS gain steps */
+static const u8 ir_currents[]	= {100, 50, 25, 12}; /* IRled currents in mA */
+
+/* Following two tables must match i.e 10Hz rate means 1 as persistence value */
+static const u16 arates_hz[] = {10, 5, 2, 1};
+static const u8 apersis[] = {1, 2, 4, 5};
+
+/* Regulators */
+static const char reg_vcc[] = "Vdd";
+static const char reg_vled[] = "Vled";
+
+static int apds990x_read_byte(struct apds990x_chip *chip, u8 reg, u8 *data)
+{
+	struct i2c_client *client = chip->client;
+	s32 ret;
+
+	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;
+}
+
+static int apds990x_read_word(struct apds990x_chip *chip, u8 reg, u16 *data)
+{
+	struct i2c_client *client = chip->client;
+	s32 ret;
+
+	reg &= ~APDS990x_CMD_TYPE_MASK;
+	reg |= APDS990x_CMD | APDS990x_CMD_TYPE_INC;
+
+	ret = i2c_smbus_read_word_data(client, reg);
+	*data = ret;
+	return (int)ret;
+}
+
+static int apds990x_write_byte(struct apds990x_chip *chip, u8 reg, u8 data)
+{
+	struct i2c_client *client = chip->client;
+	s32 ret;
+
+	reg &= ~APDS990x_CMD_TYPE_MASK;
+	reg |= APDS990x_CMD | APDS990x_CMD_TYPE_RB;
+
+	ret = i2c_smbus_write_byte_data(client, reg, data);
+	return (int)ret;
+}
+
+static int apds990x_write_word(struct apds990x_chip *chip, u8 reg, u16 data)
+{
+	struct i2c_client *client = chip->client;
+	s32 ret;
+
+	reg &= ~APDS990x_CMD_TYPE_MASK;
+	reg |= APDS990x_CMD | APDS990x_CMD_TYPE_INC;
+
+	ret = i2c_smbus_write_word_data(client, reg, 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;
+	u32 cpl;
+	u32 ir;
+
+	if (lux == 0)
+		return 0;
+	else if (lux == APDS_RANGE)
+		return APDS_RANGE;
+
+	/*
+	 * Reported LUX value is a combination of the IR and CLEAR channel
+	 * values. However, interrupt threshold is only for clear channel.
+	 * This function approximates needed HW threshold value for a given
+	 * LUX value in the current lightning type.
+	 * IR level compared to visible light varies heavily depending on the
+	 * source of the light
+	 *
+	 * Calculate threshold value for the next measurement period.
+	 * Math: threshold = lux * cpl where
+	 * cpl = atime * again / (glass_attenuation * device_factor)
+	 * (count-per-lux)
+	 *
+	 * First remove calibration. Division by four is to avoid overflow
+	 */
+	lux = lux * (APDS_CALIB_SCALER / 4) / (chip->lux_calib / 4);
+
+	/* Multiplication by 64 is to increase accuracy */
+	cpl = ((u32)chip->atime * (u32)again[chip->again_next] *
+		APDS_PARAM_SCALE * 64) / (chip->cf.ga * chip->cf.df);
+
+	thres = lux * cpl / 64;
+	/*
+	 * Convert IR light from the latest result to match with
+	 * new gain step. This helps to adapt with the current
+	 * source of light.
+	 */
+	ir = (u32)chip->lux_ir * (u32)again[chip->again_next] /
+		(u32)again[chip->again_meas];
+
+	/*
+	 * Compensate count with IR light impact
+	 * IAC1 > IAC2 (see apds990x_get_lux for formulas)
+	 */
+	if (chip->lux_clear * APDS_PARAM_SCALE >=
+		chip->rcf.afactor * chip->lux_ir)
+		thres = (chip->rcf.cf1 * thres + chip->rcf.irf1 * ir) /
+			APDS_PARAM_SCALE;
+	else
+		thres = (chip->rcf.cf2 * thres + chip->rcf.irf2 * ir) /
+			APDS_PARAM_SCALE;
+
+	if (thres >= chip->a_max_result)
+		thres = chip->a_max_result - 1;
+	return thres;
+}
+
+static inline int apds990x_set_atime(struct apds990x_chip *chip, u32 time_ms)
+{
+	u8 reg_value;
+
+	chip->atime = time_ms;
+	/* Formula is specified in the data sheet */
+	reg_value = 256 - ((time_ms * TIME_STEP_SCALER) / TIMESTEP);
+	/* Calculate max ADC value for given integration time */
+	chip->a_max_result = (u16)(256 - reg_value) * APDS990X_TIME_TO_ADC;
+	return apds990x_write_byte(chip, APDS990X_ATIME, reg_value);
+}
+
+/* Called always with mutex locked */
+static int apds990x_refresh_pthres(struct apds990x_chip *chip, int data)
+{
+	int ret, lo, hi;
+
+	/* If the chip is not in use, don't try to access it */
+	if (pm_runtime_suspended(&chip->client->dev))
+		return 0;
+
+	if (data < chip->prox_thres) {
+		lo = 0;
+		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;
+	}
+
+	ret = apds990x_write_word(chip, APDS990X_PILTL, lo);
+	ret |= apds990x_write_word(chip, APDS990X_PIHTL, hi);
+	return ret;
+}
+
+/* Called always with mutex locked */
+static int apds990x_refresh_athres(struct apds990x_chip *chip)
+{
+	int ret;
+	/* If the chip is not in use, don't try to access it */
+	if (pm_runtime_suspended(&chip->client->dev))
+		return 0;
+
+	ret = apds990x_write_word(chip, APDS990X_AILTL,
+			apds990x_lux_to_threshold(chip, chip->lux_thres_lo));
+	ret |= apds990x_write_word(chip, APDS990X_AIHTL,
+			apds990x_lux_to_threshold(chip, chip->lux_thres_hi));
+
+	return ret;
+}
+
+/* Called always with mutex locked */
+static void apds990x_force_a_refresh(struct apds990x_chip *chip)
+{
+	/* This will force ALS interrupt after the next measurement. */
+	apds990x_write_word(chip, APDS990X_AILTL, APDS_LUX_DEF_THRES_LO);
+	apds990x_write_word(chip, APDS990X_AIHTL, APDS_LUX_DEF_THRES_HI);
+}
+
+/* Called always with mutex locked */
+static void apds990x_force_p_refresh(struct apds990x_chip *chip)
+{
+	/* This will force proximity interrupt after the next measurement. */
+	apds990x_write_word(chip, APDS990X_PILTL, APDS_PROX_DEF_THRES - 1);
+	apds990x_write_word(chip, APDS990X_PIHTL, APDS_PROX_DEF_THRES);
+}
+
+/* Called always with mutex locked */
+static int apds990x_calc_again(struct apds990x_chip *chip)
+{
+	int curr_again = chip->again_meas;
+	int next_again = chip->again_meas;
+	int ret = 0;
+
+	/* Calculate suitable als gain */
+	if (chip->lux_clear == chip->a_max_result)
+		next_again -= 2; /* ALS saturated. Decrease gain by 2 steps */
+	else if (chip->lux_clear > chip->a_max_result / 2)
+		next_again--;
+	else if (chip->lux_clear < APDS_LUX_GAIN_LO_LIMIT_STRICT)
+		next_again += 2; /* Too dark. Increase gain by 2 steps */
+	else if (chip->lux_clear < APDS_LUX_GAIN_LO_LIMIT)
+		next_again++;
+
+	/* Limit gain to available range */
+	if (next_again < 0)
+		next_again = 0;
+	else if (next_again > APDS990X_MAX_AGAIN)
+		next_again = APDS990X_MAX_AGAIN;
+
+	/* Let's check can we trust the measured result */
+	if (chip->lux_clear == chip->a_max_result)
+		/* Result can be totally garbage due to saturation */
+		ret = -ERANGE;
+	else if (next_again != curr_again &&
+		chip->lux_clear < APDS_LUX_GAIN_LO_LIMIT_STRICT)
+		/*
+		 * Gain is changed and measurement result is very small.
+		 * Result can be totally garbage due to underflow
+		 */
+		ret = -ERANGE;
+
+	chip->again_next = next_again;
+	apds990x_write_byte(chip, APDS990X_CONTROL,
+			(chip->pdrive << 6) |
+			(chip->pdiode << 4) |
+			(chip->pgain << 2) |
+			(chip->again_next << 0));
+
+	/*
+	 * Error means bad result -> re-measurement is needed. The forced
+	 * refresh uses fastest possible persistence setting to get result
+	 * as soon as possible.
+	 */
+	if (ret < 0)
+		apds990x_force_a_refresh(chip);
+	else
+		apds990x_refresh_athres(chip);
+
+	return ret;
+}
+
+/* Called always with mutex locked */
+static int apds990x_get_lux(struct apds990x_chip *chip, int clear, int ir)
+{
+	int iac, iac1, iac2; /* IR adjusted counts */
+	u32 lpc; /* Lux per count */
+
+	/* Formulas:
+	 * iac1 = CF1 * CLEAR_CH - IRF1 * IR_CH
+	 * iac2 = CF2 * CLEAR_CH - IRF2 * IR_CH
+	 */
+	iac1 = (chip->cf.cf1 * clear - chip->cf.irf1 * ir) / APDS_PARAM_SCALE;
+	iac2 = (chip->cf.cf2 * clear - chip->cf.irf2 * ir) / APDS_PARAM_SCALE;
+
+	iac = max(iac1, iac2);
+	iac = max(iac, 0);
+
+	lpc = APDS990X_LUX_OUTPUT_SCALE * (chip->cf.df * chip->cf.ga) /
+		(u32)(again[chip->again_meas] * (u32)chip->atime);
+
+	return (iac * lpc) / APDS_PARAM_SCALE;
+}
+
+static int apds990x_ack_int(struct apds990x_chip *chip, u8 mode)
+{
+	struct i2c_client *client = chip->client;
+	s32 ret;
+	u8 reg = APDS990x_CMD | APDS990x_CMD_TYPE_SPE;
+
+	switch (mode & (APDS990X_ST_AINT | APDS990X_ST_PINT)) {
+	case APDS990X_ST_AINT:
+		reg |= APDS990X_INT_ACK_ALS;
+		break;
+	case APDS990X_ST_PINT:
+		reg |= APDS990X_INT_ACK_PS;
+		break;
+	default:
+		reg |= APDS990X_INT_ACK_BOTH;
+		break;
+	}
+
+	ret = i2c_smbus_read_byte_data(client, reg);
+	return (int)ret;
+}
+
+static irqreturn_t apds990x_irq(int irq, void *data)
+{
+	struct apds990x_chip *chip = data;
+	u8 status;
+
+	apds990x_read_byte(chip, APDS990X_STATUS, &status);
+	apds990x_ack_int(chip, status);
+
+	mutex_lock(&chip->mutex);
+	if (!pm_runtime_suspended(&chip->client->dev)) {
+		if (status & APDS990X_ST_AINT) {
+			apds990x_read_word(chip, APDS990X_CDATAL,
+					&chip->lux_clear);
+			apds990x_read_word(chip, APDS990X_IRDATAL,
+					&chip->lux_ir);
+			/* Store used gain for calculations */
+			chip->again_meas = chip->again_next;
+
+			chip->lux_raw = apds990x_get_lux(chip,
+							chip->lux_clear,
+							chip->lux_ir);
+
+			if (apds990x_calc_again(chip) == 0) {
+				/* 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");
+			}
+		}
+
+		if ((status & APDS990X_ST_PINT) && chip->prox_en) {
+			u16 clr_ch;
+
+			apds990x_read_word(chip, APDS990X_CDATAL, &clr_ch);
+			/*
+			 * If ALS channel is saturated at min gain,
+			 * proximity gives false posivite values.
+			 * Just ignore them.
+			 */
+			if (chip->again_meas == 0 &&
+				clr_ch == chip->a_max_result)
+				chip->prox_data = 0;
+			else
+				apds990x_read_word(chip,
+						APDS990X_PDATAL,
+						&chip->prox_data);
+
+			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");
+		}
+	}
+	mutex_unlock(&chip->mutex);
+	return IRQ_HANDLED;
+}
+
+static int apds990x_configure(struct apds990x_chip *chip)
+{
+	/* It is recommended to use disabled mode during these operations */
+	apds990x_write_byte(chip, APDS990X_ENABLE, APDS990X_EN_DISABLE_ALL);
+
+	/* conversion and wait times for different state machince states */
+	apds990x_write_byte(chip, APDS990X_PTIME, APDS990X_PTIME_DEFAULT);
+	apds990x_write_byte(chip, APDS990X_WTIME, APDS990X_WTIME_DEFAULT);
+	apds990x_set_atime(chip, APDS_LUX_AVERAGING_TIME);
+
+	apds990x_write_byte(chip, APDS990X_CONFIG, 0);
+
+	/* Persistence levels */
+	apds990x_write_byte(chip, APDS990X_PERS,
+			(chip->lux_persistence << APDS990X_APERS_SHIFT) |
+			(chip->prox_persistence << APDS990X_PPERS_SHIFT));
+
+	apds990x_write_byte(chip, APDS990X_PPCOUNT, chip->pdata->ppcount);
+
+	/* Start with relatively small gain */
+	chip->again_meas = 1;
+	chip->again_next = 1;
+	apds990x_write_byte(chip, APDS990X_CONTROL,
+			(chip->pdrive << 6) |
+			(chip->pdiode << 4) |
+			(chip->pgain << 2) |
+			(chip->again_next << 0));
+	return 0;
+}
+
+static int apds990x_detect(struct apds990x_chip *chip)
+{
+	struct i2c_client *client = chip->client;
+	int ret;
+	u8 id;
+
+	ret = apds990x_read_byte(chip, APDS990X_ID, &id);
+	if (ret < 0) {
+		dev_err(&client->dev, "ID read failed\n");
+		return ret;
+	}
+
+	ret = apds990x_read_byte(chip, APDS990X_REV, &chip->revision);
+	if (ret < 0) {
+		dev_err(&client->dev, "REV read failed\n");
+		return ret;
+	}
+
+	switch (id) {
+	case APDS990X_ID_0:
+	case APDS990X_ID_4:
+	case APDS990X_ID_29:
+		snprintf(chip->chipname, sizeof(chip->chipname), "APDS-990x");
+		break;
+	default:
+		ret = -ENODEV;
+		break;
+	}
+	return ret;
+}
+
+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;
+}
+
+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;
+
+	if (strict_strtoul(buf, 0, &value))
+		return -EINVAL;
+
+	if (chip->lux_calib > APDS_RANGE)
+		return -EINVAL;
+
+	chip->lux_calib = value;
+
+	return len;
+}
+
+static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, apds990x_lux_calib_show,
+		apds990x_lux_calib_store);
+
+static ssize_t apds990x_rate_avail(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	int i;
+	int pos = 0;
+	for (i = 0; i < ARRAY_SIZE(arates_hz); i++)
+		pos += sprintf(buf + pos, "%d ", arates_hz[i]);
+	sprintf(buf + pos - 1, "\n");
+	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 int apds990x_set_arate(struct apds990x_chip *chip, int rate)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(arates_hz); i++)
+		if (rate >= arates_hz[i])
+			break;
+
+	if (i == ARRAY_SIZE(arates_hz))
+		return -EINVAL;
+
+	/* Pick up corresponding persistence value */
+	chip->lux_persistence = apersis[i];
+	chip->arate = arates_hz[i];
+
+	/* If the chip is not in use, don't try to access it */
+	if (pm_runtime_suspended(&chip->client->dev))
+		return 0;
+
+	/* Persistence levels */
+	return apds990x_write_byte(chip, APDS990X_PERS,
+			(chip->lux_persistence << APDS990X_APERS_SHIFT) |
+			(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)
+{
+	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	unsigned long value;
+	int ret;
+
+	if (strict_strtoul(buf, 0, &value))
+		return -EINVAL;
+
+	mutex_lock(&chip->mutex);
+	ret = apds990x_set_arate(chip, value);
+	mutex_unlock(&chip->mutex);
+
+	if (ret < 0)
+		return ret;
+	return len;
+}
+
+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)
+{
+	ssize_t ret;
+	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	if (pm_runtime_suspended(dev) || !chip->prox_en)
+		return -EIO;
+
+	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);
+
+static ssize_t apds990x_prox_range_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%u\n", APDS_PROX_RANGE);
+}
+
+static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, apds990x_prox_range_show, NULL);
+
+static ssize_t apds990x_prox_enable_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	return sprintf(buf, "%d\n", chip->prox_en);
+}
+
+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;
+
+	if (strict_strtoul(buf, 0, &value))
+		return -EINVAL;
+
+	mutex_lock(&chip->mutex);
+
+	if (!chip->prox_en)
+		chip->prox_data = 0;
+
+	if (value)
+		chip->prox_en++;
+	else if (chip->prox_en > 0)
+		chip->prox_en--;
+
+	if (!pm_runtime_suspended(dev))
+		apds990x_mode_on(chip);
+	mutex_unlock(&chip->mutex);
+	return len;
+}
+
+static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, apds990x_prox_enable_show,
+						   apds990x_prox_enable_store);
+
+static const char reporting_modes[][9] = {"trigger", "periodic"};
+
+static ssize_t apds990x_prox_reporting_mode_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	return sprintf(buf, "%s\n",
+		reporting_modes[!!chip->prox_continuous_mode]);
+}
+
+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);
+
+	if (sysfs_streq(buf, reporting_modes[0]))
+		chip->prox_continuous_mode = 0;
+	else if (sysfs_streq(buf, reporting_modes[1]))
+		chip->prox_continuous_mode = 1;
+	else
+		return -EINVAL;
+	return len;
+}
+
+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)
+{
+	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);
+
+
+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);
+	return sprintf(buf, "%d\n", chip->lux_thres_hi);
+}
+
+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);
+	return sprintf(buf, "%d\n", chip->lux_thres_lo);
+}
+
+static ssize_t apds990x_set_lux_thresh(struct apds990x_chip *chip, u32 *target,
+				const char *buf)
+{
+	int ret = 0;
+	unsigned long thresh;
+
+	if (strict_strtoul(buf, 0, &thresh))
+		return -EINVAL;
+
+	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;
+
+}
+
+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);
+	if (ret < 0)
+		return ret;
+	return len;
+}
+
+static ssize_t apds990x_lux_thresh_below_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_lo, buf);
+	if (ret < 0)
+		return ret;
+	return len;
+}
+
+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);
+	return sprintf(buf, "%d\n", chip->prox_thres);
+}
+
+static ssize_t apds990x_prox_threshold_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;
+
+	if (strict_strtoul(buf, 0, &value))
+		return -EINVAL;
+
+	if ((value > APDS_RANGE) || (value == 0) ||
+		(value < APDS_PROX_HYSTERESIS))
+		return -EINVAL;
+
+	mutex_lock(&chip->mutex);
+	chip->prox_thres = value;
+
+	apds990x_force_p_refresh(chip);
+	mutex_unlock(&chip->mutex);
+	return len;
+}
+
+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)
+{
+	return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
+	return 0;
+}
+
+static ssize_t apds990x_power_state_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;
+
+	if (strict_strtoul(buf, 0, &value))
+		return -EINVAL;
+	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;
+}
+
+static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
+		apds990x_power_state_show,
+		apds990x_power_state_store);
+
+static ssize_t apds990x_chip_id_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	struct apds990x_chip *chip =  dev_get_drvdata(dev);
+	return sprintf(buf, "%s %d\n", chip->chipname, chip->revision);
+}
+
+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 struct attribute_group apds990x_attribute_group[] = {
+	{.attrs = sysfs_attrs_ctrl },
+};
+
+static int __devinit apds990x_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct apds990x_chip *chip;
+	int err;
+
+	chip = kzalloc(sizeof *chip, GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, chip);
+	chip->client  = client;
+
+	init_waitqueue_head(&chip->wait);
+	mutex_init(&chip->mutex);
+	chip->pdata	= client->dev.platform_data;
+
+	if (chip->pdata == NULL) {
+		dev_err(&client->dev, "platform data is mandatory\n");
+		err = -EINVAL;
+		goto fail1;
+	}
+
+	if (chip->pdata->cf.ga == 0) {
+		/* set uncovered sensor default parameters */
+		chip->cf.ga = 1966; /* 0.48 * APDS_PARAM_SCALE */
+		chip->cf.cf1 = 4096; /* 1.00 * APDS_PARAM_SCALE */
+		chip->cf.irf1 = 9134; /* 2.23 * APDS_PARAM_SCALE */
+		chip->cf.cf2 = 2867; /* 0.70 * APDS_PARAM_SCALE */
+		chip->cf.irf2 = 5816; /* 1.42 * APDS_PARAM_SCALE */
+		chip->cf.df = 52;
+	} else {
+		chip->cf = chip->pdata->cf;
+	}
+
+	/* precalculate inverse chip factors for threshold control */
+	chip->rcf.afactor =
+		(chip->cf.irf1 - chip->cf.irf2) * APDS_PARAM_SCALE /
+		(chip->cf.cf1 - chip->cf.cf2);
+	chip->rcf.cf1 = APDS_PARAM_SCALE * APDS_PARAM_SCALE /
+		chip->cf.cf1;
+	chip->rcf.irf1 = chip->cf.irf1 * APDS_PARAM_SCALE /
+		chip->cf.cf1;
+	chip->rcf.cf2 = APDS_PARAM_SCALE * APDS_PARAM_SCALE /
+		chip->cf.cf2;
+	chip->rcf.irf2 = chip->cf.irf2 * APDS_PARAM_SCALE /
+		chip->cf.cf2;
+
+	/* Set something to start with */
+	chip->lux_thres_hi = APDS_LUX_DEF_THRES_HI;
+	chip->lux_thres_lo = APDS_LUX_DEF_THRES_LO;
+	chip->lux_calib = APDS_LUX_NEUTRAL_CALIB_VALUE;
+
+	chip->prox_thres = APDS_PROX_DEF_THRES;
+	chip->pdrive = chip->pdata->pdrive;
+	chip->pdiode = APDS_PDIODE_IR;
+	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,
+				 ARRAY_SIZE(chip->regs), chip->regs);
+	if (err < 0) {
+		dev_err(&client->dev, "Cannot get regulators\n");
+		goto fail1;
+	}
+
+	err = regulator_bulk_enable(ARRAY_SIZE(chip->regs), chip->regs);
+	if (err < 0) {
+		dev_err(&client->dev, "Cannot enable regulators\n");
+		goto fail2;
+	}
+
+	usleep_range(APDS_STARTUP_DELAY, 2 * APDS_STARTUP_DELAY);
+
+	err = apds990x_detect(chip);
+	if (err < 0) {
+		dev_err(&client->dev, "APDS990X not found\n");
+		goto fail3;
+	}
+
+	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);
+
+	if (chip->pdata->setup_resources) {
+		err = chip->pdata->setup_resources();
+		if (err) {
+			err = -EINVAL;
+			goto fail3;
+		}
+	}
+
+	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);
+	if (err) {
+		dev_err(&client->dev, "could not get IRQ %d\n",
+			client->irq);
+		goto fail5;
+	}
+	return err;
+fail5:
+	sysfs_remove_group(&chip->client->dev.kobj,
+			&apds990x_attribute_group[0]);
+fail4:
+	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);
+	return err;
+}
+
+static int __devexit 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);
+
+	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_free(ARRAY_SIZE(chip->regs), chip->regs);
+
+	kfree(chip);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int apds990x_suspend(struct device *dev)
+{
+	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+	struct apds990x_chip *chip = i2c_get_clientdata(client);
+
+	apds990x_chip_off(chip);
+	return 0;
+}
+
+static int apds990x_resume(struct device *dev)
+{
+	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+	struct apds990x_chip *chip = i2c_get_clientdata(client);
+
+	/*
+	 * If we were enabled at suspend time, it is expected
+	 * everything works nice and smoothly. Chip_on is enough
+	 */
+	apds990x_chip_on(chip);
+
+	return 0;
+}
+#else
+#define apds990x_suspend  NULL
+#define apds990x_resume	  NULL
+#define apds990x_shutdown NULL
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int apds990x_runtime_suspend(struct device *dev)
+{
+	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+	struct apds990x_chip *chip = i2c_get_clientdata(client);
+
+	apds990x_chip_off(chip);
+	return 0;
+}
+
+static int apds990x_runtime_resume(struct device *dev)
+{
+	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+	struct apds990x_chip *chip = i2c_get_clientdata(client);
+
+	apds990x_chip_on(chip);
+	return 0;
+}
+
+#endif
+
+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 struct i2c_driver apds990x_driver = {
+	.driver	 = {
+		.name	= "apds990x",
+		.owner	= THIS_MODULE,
+		.pm	= &apds990x_pm_ops,
+	},
+	.probe	  = apds990x_probe,
+	.remove	  = __devexit_p(apds990x_remove),
+	.id_table = apds990x_id,
+};
+
+static int __init apds990x_init(void)
+{
+	return i2c_add_driver(&apds990x_driver);
+}
+
+static void __exit apds990x_exit(void)
+{
+	i2c_del_driver(&apds990x_driver);
+}
+
+MODULE_DESCRIPTION("APDS990X combined ALS and proximity sensor");
+MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
+MODULE_LICENSE("GPL v2");
+
+module_init(apds990x_init);
+module_exit(apds990x_exit);

include/linux/i2c/apds990x.h

···
+/*
+ * This file is part of the APDS990x sensor driver.
+ * Chip is combined proximity and ambient light sensor.
+ *
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Samu Onkalo <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __APDS990X_H__
+#define __APDS990X_H__
+
+
+#define APDS_IRLED_CURR_12mA	0x3
+#define APDS_IRLED_CURR_25mA	0x2
+#define APDS_IRLED_CURR_50mA	0x1
+#define APDS_IRLED_CURR_100mA	0x0
+
+/**
+ * struct apds990x_chip_factors - defines effect of the cover window
+ * @ga: Total glass attenuation
+ * @cf1: clear channel factor 1 for raw to lux conversion
+ * @irf1: IR channel factor 1 for raw to lux conversion
+ * @cf2: clear channel factor 2 for raw to lux conversion
+ * @irf2: IR channel factor 2 for raw to lux conversion
+ * @df: device factor for conversion formulas
+ *
+ * Structure for tuning ALS calculation to match with environment.
+ * Values depend on the material above the sensor and the sensor
+ * itself. If the GA is zero, driver will use uncovered sensor default values
+ * format: decimal value * APDS_PARAM_SCALE except df which is plain integer.
+ */
+#define APDS_PARAM_SCALE 4096
+struct apds990x_chip_factors {
+	int ga;
+	int cf1;
+	int irf1;
+	int cf2;
+	int irf2;
+	int df;
+};
+
+/**
+ * struct apds990x_platform_data - platform data for apsd990x.c driver
+ * @cf: chip factor data
+ * @pddrive: IR-led driving current
+ * @ppcount: number of IR pulses used for proximity estimation
+ * @setup_resources: interrupt line setup call back function
+ * @release_resources: interrupt line release call back function
+ *
+ * Proximity detection result depends heavily on correct ppcount, pdrive
+ * and cover window.
+ *
+ */
+
+struct apds990x_platform_data {
+	struct apds990x_chip_factors cf;
+	u8     pdrive;
+	u8     ppcount;
+	int    (*setup_resources)(void);
+	int    (*release_resources)(void);
+};
+
+#endif