path: root/drivers/iio/light/rpr0521.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * RPR-0521 ROHM Ambient Light and Proximity Sensor
 *
 * Copyright (c) 2015, Intel Corporation.
 *
 * IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
 *
 * TODO: illuminance channel
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/delay.h>
#include <linux/acpi.h>

#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/sysfs.h>
#include <linux/pm_runtime.h>

#define RPR0521_REG_SYSTEM_CTRL		0x40
#define RPR0521_REG_MODE_CTRL		0x41
#define RPR0521_REG_ALS_CTRL		0x42
#define RPR0521_REG_PXS_CTRL		0x43
#define RPR0521_REG_PXS_DATA		0x44 /* 16-bit, little endian */
#define RPR0521_REG_ALS_DATA0		0x46 /* 16-bit, little endian */
#define RPR0521_REG_ALS_DATA1		0x48 /* 16-bit, little endian */
#define RPR0521_REG_INTERRUPT		0x4A
#define RPR0521_REG_PS_OFFSET_LSB	0x53
#define RPR0521_REG_ID			0x92

#define RPR0521_MODE_ALS_MASK		BIT(7)
#define RPR0521_MODE_PXS_MASK		BIT(6)
#define RPR0521_MODE_MEAS_TIME_MASK	GENMASK(3, 0)
#define RPR0521_ALS_DATA0_GAIN_MASK	GENMASK(5, 4)
#define RPR0521_ALS_DATA0_GAIN_SHIFT	4
#define RPR0521_ALS_DATA1_GAIN_MASK	GENMASK(3, 2)
#define RPR0521_ALS_DATA1_GAIN_SHIFT	2
#define RPR0521_PXS_GAIN_MASK		GENMASK(5, 4)
#define RPR0521_PXS_GAIN_SHIFT		4
#define RPR0521_PXS_PERSISTENCE_MASK	GENMASK(3, 0)
#define RPR0521_INTERRUPT_INT_TRIG_PS_MASK	BIT(0)
#define RPR0521_INTERRUPT_INT_TRIG_ALS_MASK	BIT(1)
#define RPR0521_INTERRUPT_INT_REASSERT_MASK	BIT(3)
#define RPR0521_INTERRUPT_ALS_INT_STATUS_MASK	BIT(6)
#define RPR0521_INTERRUPT_PS_INT_STATUS_MASK	BIT(7)

#define RPR0521_MODE_ALS_ENABLE		BIT(7)
#define RPR0521_MODE_ALS_DISABLE	0x00
#define RPR0521_MODE_PXS_ENABLE		BIT(6)
#define RPR0521_MODE_PXS_DISABLE	0x00
#define RPR0521_PXS_PERSISTENCE_DRDY	0x00

#define RPR0521_INTERRUPT_INT_TRIG_PS_ENABLE	BIT(0)
#define RPR0521_INTERRUPT_INT_TRIG_PS_DISABLE	0x00
#define RPR0521_INTERRUPT_INT_TRIG_ALS_ENABLE	BIT(1)
#define RPR0521_INTERRUPT_INT_TRIG_ALS_DISABLE	0x00
#define RPR0521_INTERRUPT_INT_REASSERT_ENABLE	BIT(3)
#define RPR0521_INTERRUPT_INT_REASSERT_DISABLE	0x00

#define RPR0521_MANUFACT_ID		0xE0
#define RPR0521_DEFAULT_MEAS_TIME	0x06 /* ALS - 100ms, PXS - 100ms */

#define RPR0521_DRV_NAME		"RPR0521"
#define RPR0521_IRQ_NAME		"rpr0521_event"
#define RPR0521_REGMAP_NAME		"rpr0521_regmap"

#define RPR0521_SLEEP_DELAY_MS	2000

#define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"
#define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"

struct rpr0521_gain {
	int scale;
	int uscale;
};

static const struct rpr0521_gain rpr0521_als_gain[4] = {
	{1, 0},		/* x1 */
	{0, 500000},	/* x2 */
	{0, 15625},	/* x64 */
	{0, 7812},	/* x128 */
};

static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
	{1, 0},		/* x1 */
	{0, 500000},	/* x2 */
	{0, 125000},	/* x4 */
};

enum rpr0521_channel {
	RPR0521_CHAN_PXS,
	RPR0521_CHAN_ALS_DATA0,
	RPR0521_CHAN_ALS_DATA1,
};

struct rpr0521_reg_desc {
	u8 address;
	u8 device_mask;
};

static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
	[RPR0521_CHAN_PXS]	= {
		.address	= RPR0521_REG_PXS_DATA,
		.device_mask	= RPR0521_MODE_PXS_MASK,
	},
	[RPR0521_CHAN_ALS_DATA0] = {
		.address	= RPR0521_REG_ALS_DATA0,
		.device_mask	= RPR0521_MODE_ALS_MASK,
	},
	[RPR0521_CHAN_ALS_DATA1] = {
		.address	= RPR0521_REG_ALS_DATA1,
		.device_mask	= RPR0521_MODE_ALS_MASK,
	},
};

static const struct rpr0521_gain_info {
	u8 reg;
	u8 mask;
	u8 shift;
	const struct rpr0521_gain *gain;
	int size;
} rpr0521_gain[] = {
	[RPR0521_CHAN_PXS] = {
		.reg	= RPR0521_REG_PXS_CTRL,
		.mask	= RPR0521_PXS_GAIN_MASK,
		.shift	= RPR0521_PXS_GAIN_SHIFT,
		.gain	= rpr0521_pxs_gain,
		.size	= ARRAY_SIZE(rpr0521_pxs_gain),
	},
	[RPR0521_CHAN_ALS_DATA0] = {
		.reg	= RPR0521_REG_ALS_CTRL,
		.mask	= RPR0521_ALS_DATA0_GAIN_MASK,
		.shift	= RPR0521_ALS_DATA0_GAIN_SHIFT,
		.gain	= rpr0521_als_gain,
		.size	= ARRAY_SIZE(rpr0521_als_gain),
	},
	[RPR0521_CHAN_ALS_DATA1] = {
		.reg	= RPR0521_REG_ALS_CTRL,
		.mask	= RPR0521_ALS_DATA1_GAIN_MASK,
		.shift	= RPR0521_ALS_DATA1_GAIN_SHIFT,
		.gain	= rpr0521_als_gain,
		.size	= ARRAY_SIZE(rpr0521_als_gain),
	},
};

struct rpr0521_samp_freq {
	int	als_hz;
	int	als_uhz;
	int	pxs_hz;
	int	pxs_uhz;
};

static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = {
/*	{ALS, PXS},		   W==currently writable option */
	{0, 0, 0, 0},		/* W0000, 0=standby */
	{0, 0, 100, 0},		/*  0001 */
	{0, 0, 25, 0},		/*  0010 */
	{0, 0, 10, 0},		/*  0011 */
	{0, 0, 2, 500000},	/*  0100 */
	{10, 0, 20, 0},		/*  0101 */
	{10, 0, 10, 0},		/* W0110 */
	{10, 0, 2, 500000},	/*  0111 */
	{2, 500000, 20, 0},	/*  1000, measurement 100ms, sleep 300ms */
	{2, 500000, 10, 0},	/*  1001, measurement 100ms, sleep 300ms */
	{2, 500000, 0, 0},	/*  1010, high sensitivity mode */
	{2, 500000, 2, 500000},	/* W1011, high sensitivity mode */
	{20, 0,