linux-imx

/**

 * Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor

 *

 * Copyright (c) 2015, Intel Corporation.

 *

 * This file is subject to the terms and conditions of version 2 of

 * the GNU General Public License. See the file COPYING in the main

 * directory of this archive for more details.

 *

 * IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.

 */

​

#include <linux/acpi.h>

#include <linux/i2c.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/regmap.h>

#include <linux/iio/events.h>

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

​

#define STK3310_REG_STATE           0x00

#define STK3310_REG_PSCTRL          0x01

#define STK3310_REG_ALSCTRL         0x02

#define STK3310_REG_INT             0x04

#define STK3310_REG_THDH_PS         0x06

#define STK3310_REG_THDL_PS         0x08

#define STK3310_REG_FLAG            0x10

#define STK3310_REG_PS_DATA_MSB         0x11

#define STK3310_REG_PS_DATA_LSB         0x12

#define STK3310_REG_ALS_DATA_MSB        0x13

#define STK3310_REG_ALS_DATA_LSB        0x14

#define STK3310_REG_ID              0x3E

#define STK3310_MAX_REG             0x80

​

#define STK3310_STATE_EN_PS         BIT(0)

#define STK3310_STATE_EN_ALS            BIT(1)

#define STK3310_STATE_STANDBY           0x00

​

#define STK3310_CHIP_ID_VAL         0x13

#define STK3311_CHIP_ID_VAL         0x1D

#define STK3310_PSINT_EN            0x01

#define STK3310_PS_MAX_VAL          0xFFFF

​

#define STK3310_DRIVER_NAME         "stk3310"

#define STK3310_REGMAP_NAME         "stk3310_regmap"

#define STK3310_EVENT               "stk3310_event"

​

#define STK3310_SCALE_AVAILABLE         "6.4 1.6 0.4 0.1"

​

#define STK3310_IT_AVAILABLE \

    "0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \

    "0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \

    "3.031040 6.062080"

​

#define STK3310_REGFIELD(name)                          \

    do {                                    \

        data->reg_##name =                      \

            devm_regmap_field_alloc(&client->dev, regmap,       \

                stk3310_reg_field_##name);          \

        if (IS_ERR(data->reg_##name)) {                 \

            dev_err(&client->dev, "reg field alloc failed.\n"); \

            return PTR_ERR(data->reg_##name);           \

        }                               \

    } while (0)

​

static const struct reg_field stk3310_reg_field_state =

                REG_FIELD(STK3310_REG_STATE, 0, 2);

static const struct reg_field stk3310_reg_field_als_gain =

                REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);

static const struct reg_field stk3310_reg_field_ps_gain =

                REG_FIELD(STK3310_REG_PSCTRL, 4, 5);

static const struct reg_field stk3310_reg_field_als_it =

                REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);

static const struct reg_field stk3310_reg_field_ps_it =

                REG_FIELD(STK3310_REG_PSCTRL, 0, 3);

static const struct reg_field stk3310_reg_field_int_ps =

                REG_FIELD(STK3310_REG_INT, 0, 2);

static const struct reg_field stk3310_reg_field_flag_psint =

                REG_FIELD(STK3310_REG_FLAG, 4, 4);

static const struct reg_field stk3310_reg_field_flag_nf =

                REG_FIELD(STK3310_REG_FLAG, 0, 0);

​

/* Estimate maximum proximity values with regard to measurement scale. */

static const int stk3310_ps_max[4] = {

    STK3310_PS_MAX_VAL / 640,

    STK3310_PS_MAX_VAL / 160,

    STK3310_PS_MAX_VAL /  40,

    STK3310_PS_MAX_VAL /  10

};

​