linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * apds9802als.c - apds9802  ALS Driver

 *

 * Copyright (C) 2009 Intel Corp

 *

 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */

​

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/err.h>

#include <linux/delay.h>

#include <linux/mutex.h>

#include <linux/sysfs.h>

#include <linux/pm_runtime.h>

​

#define ALS_MIN_RANGE_VAL 1

#define ALS_MAX_RANGE_VAL 2

#define POWER_STA_ENABLE 1

#define POWER_STA_DISABLE 0

​

#define DRIVER_NAME "apds9802als"

​

struct als_data {

    struct mutex mutex;

};

​

static ssize_t als_sensing_range_show(struct device *dev,

            struct device_attribute *attr,  char *buf)

{

    struct i2c_client *client = to_i2c_client(dev);

    int  val;

​

    val = i2c_smbus_read_byte_data(client, 0x81);

    if (val < 0)

        return val;

    if (val & 1)

        return sprintf(buf, "4095\n");

    else

        return sprintf(buf, "65535\n");

}

​

static int als_wait_for_data_ready(struct device *dev)

{

    struct i2c_client *client = to_i2c_client(dev);

    int ret;

    int retry = 10;

​

    do {

        msleep(30);

        ret = i2c_smbus_read_byte_data(client, 0x86);

    } while (!(ret & 0x80) && retry--);

​

    if (retry < 0) {

        dev_warn(dev, "timeout waiting for data ready\n");

        return -ETIMEDOUT;

    }

​

    return 0;

}

​

static ssize_t als_lux0_input_data_show(struct device *dev,

            struct device_attribute *attr, char *buf)

{

    struct i2c_client *client = to_i2c_client(dev);

    struct als_data *data = i2c_get_clientdata(client);

    int ret_val;

    int temp;

​

    /* Protect against parallel reads */

    pm_runtime_get_sync(dev);

    mutex_lock(&data->mutex);

​

    /* clear EOC interrupt status */

    i2c_smbus_write_byte(client, 0x40);

    /* start measurement */

    temp = i2c_smbus_read_byte_data(client, 0x81);

    i2c_smbus_write_byte_data(client, 0x81, temp | 0x08);

​

    ret_val = als_wait_for_data_ready(dev);

    if (ret_val < 0)

        goto failed;

​

    temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */

    if (temp < 0) {

        ret_val = temp;

        goto failed;

    }