input: sensors: add lite-on ltr553 ALPS sensor driver

LTR-553ALS-01 optical sensor

LTR553 is an ambient light and proximity sensor. It connects to host SoC via

I2C bus.

Abbreviation:

ALS: ambient light sensor

PS: proximity sensor

ALPS: ambient light and proximity sensor

Required properties:

 - compatible		: Should be "liteon,ltr553".

 - reg			: i2c slave address of this device.

 - vdd-supply		: Analog power supply needed to power up this device.

 - vio-supply		: Digital IO power supply needed for IO and i2c.

 - interrupt-parent	: The interrupt controller this device is connected to.

 - interrupts		: L/P sample interrupt to indicate new data ready.

 - pinctrl-names	: pinctrl configuration names of this device. Should be

	"default" and "sleep".

 - pinctrl-0		: Should specify pin control groups used for this sensor.

 - pinctrl-1		: Should specify pin control groups used for this sensor.

 - liteon,irq-gpio	: GPIO pin for interrupt of this device.

 - liteon,als-ps-persist: The number of data out of range to trigger interrupt.

 - liteon,ps-led	: Proximity sensor LED settings.

 - liteon,ps-pulses	: Controls the number of LED pulses to be emitted.

 - liteon,als-integration-time	: ALS integration time configuration. The

	maximum value is 7.

 Optional properties:

 - liteon,ps-distance-table	: Proximity sensor ADC value to transfer into

	distance in centimeter.

 - liteon,als-equation-0	: Equation to convert ALS data into lux for

	light ratio below 0.45.

 - liteon,als-equation-1	: Equation to convert ALS data into lux for

	light ratio between 0.45 and 0.68.

 - liteon,als-equation-2	: Equation to convert ALS data into lux for

	light ratio between 0.68 and 0.99.

 - liteon,als-equation-3	: Equation to convert ALS data into lux for

	light ratio above 0.99.

 - liteon,wakeup-threshold	: Threshold in centimeter to wake up SoC in

	suspend mode when proximity is enabled.

 Example:

 i2c@78b5000 { /* BLSP1 QUP1 */

	 liteon@23 {

		 compatible = "liteon,ltr553";

		 reg = <0x23>;

		 vdd-supply = <&pm8916_l17>;

		 vio-supply = <&pm8916_l6>;

		 interrupt-parent = <&msm_gpio>;

		 interrupts = <113 0x2002>;

		 pinctrl-names = "default","sleep";

		 pinctrl-0 = <&ltr553_default>;

		 pinctrl-1 = <&ltr553_sleep>;

		 liteon,irq-gpio = <&msm_gpio 113 0x2002>;

		 liteon,als-ps-persist = <0>;

		 liteon,ps-led = <0x7f>;

		 liteon,ps-pulses = <4>;

		 liteon,wakeup-threshold = <4>;

		 liteon,als-integration-time = <0>;

	 };

 }

intersil	Intersil Corp.

lattice	Lattice Semiconductor.

linux	Linux-specific binding

liteon	Lite-On Technology Corporation

kionix	Kionix Inc.

marvell	Marvell Technology Group Ltd.

maxim	Maxim Integrated Products