linux-imx

/*

 * apds9802als.c - apds9802  ALS Driver

 *

 * Copyright (C) 2009 Intel Corp

 *

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

 *

 * 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; version 2 of the License.

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

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

 *

 */

​

#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;