linux-imx

/*

 * isl29020.c - Intersil  ALS Driver

 *

 * Copyright (C) 2008 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.

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

 *

 * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf

 */

​

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/err.h>

#include <linux/delay.h>

#include <linux/sysfs.h>

#include <linux/pm_runtime.h>

​

static DEFINE_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, 0x00);

​

    if (val < 0)

        return val;

    return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));

​

}

​

static ssize_t als_lux_input_data_show(struct device *dev,

            struct device_attribute *attr, char *buf)

{

    struct i2c_client *client = to_i2c_client(dev);

    int ret_val, val;

    unsigned long int lux;

    int temp;

​

    pm_runtime_get_sync(dev);

    msleep(100);

​

    mutex_lock(&mutex);

    temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */

    if (temp < 0) {

        pm_runtime_put_sync(dev);