linux-imx

/*

 * Device driver for monitoring ambient light intensity (lux)

 * within the TAOS tsl258x family of devices (tsl2580, tsl2581, tsl2583).

 *

 * Copyright (c) 2011, TAOS Corporation.

 * Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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.

 */

​

#include <linux/kernel.h>

#include <linux/i2c.h>

#include <linux/errno.h>

#include <linux/delay.h>

#include <linux/string.h>

#include <linux/mutex.h>

#include <linux/unistd.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/pm_runtime.h>

​

/* Device Registers and Masks */

#define TSL2583_CNTRL           0x00

#define TSL2583_ALS_TIME        0X01

#define TSL2583_INTERRUPT       0x02

#define TSL2583_GAIN            0x07

#define TSL2583_REVID           0x11

#define TSL2583_CHIPID          0x12

#define TSL2583_ALS_CHAN0LO     0x14

#define TSL2583_ALS_CHAN0HI     0x15

#define TSL2583_ALS_CHAN1LO     0x16

#define TSL2583_ALS_CHAN1HI     0x17

#define TSL2583_TMR_LO          0x18

#define TSL2583_TMR_HI          0x19

​

/* tsl2583 cmd reg masks */

#define TSL2583_CMD_REG         0x80

#define TSL2583_CMD_SPL_FN      0x60

#define TSL2583_CMD_ALS_INT_CLR     0x01

​

/* tsl2583 cntrl reg masks */

#define TSL2583_CNTL_ADC_ENBL       0x02

#define TSL2583_CNTL_PWR_OFF        0x00

#define TSL2583_CNTL_PWR_ON     0x01

​

/* tsl2583 status reg masks */

#define TSL2583_STA_ADC_VALID       0x01

#define TSL2583_STA_ADC_INTR        0x10

​

/* Lux calculation constants */

#define TSL2583_LUX_CALC_OVER_FLOW  65535

​

#define TSL2583_INTERRUPT_DISABLED  0x00

​

#define TSL2583_CHIP_ID         0x90

#define TSL2583_CHIP_ID_MASK        0xf0

​

#define TSL2583_POWER_OFF_DELAY_MS  2000

​

/* Per-device data */

struct tsl2583_als_info {

    u16 als_ch0;

    u16 als_ch1;

    u16 lux;

};

​

struct tsl2583_lux {

    unsigned int ratio;

    unsigned int ch0;

    unsigned int ch1;

};

​

static const struct tsl2583_lux tsl2583_default_lux[] = {

    {  9830,  8520, 15729 },

    { 12452, 10807, 23344 },

    { 14746,  6383, 11705 },

    { 17695,  4063,  6554 },

    {     0,     0,     0 }  /* Termination segment */

};

​

#define TSL2583_MAX_LUX_TABLE_ENTRIES 11

​