linux-imx

/*

 * drivers/hwmon/lis3lv02d_i2c.c

 *

 * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.

 * Driver is based on corresponding SPI driver written by Daniel Mack

 * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).

 *

 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

 *

 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>

 *

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

 * modify it under the terms of the GNU General Public License

 * version 2 as published by the Free Software Foundation.

 *

 * 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., 51 Franklin St, Fifth Floor, Boston, MA

 * 02110-1301 USA

 */

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/pm_runtime.h>

#include <linux/delay.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/of_device.h>

​

#include "lis3lv02d.h"

​

#define DRV_NAME    "lis3lv02d_i2c"

​

static const char reg_vdd[]    = "Vdd";

static const char reg_vdd_io[] = "Vdd_IO";

​

static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)

{

    int ret;

    if (state == LIS3_REG_OFF) {

        ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),

                    lis3->regulators);

    } else {

        ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),

                    lis3->regulators);

        /* Chip needs time to wakeup. Not mentioned in datasheet */

        usleep_range(10000, 20000);

    }

    return ret;

}

​

static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)

{

    struct i2c_client *c = lis3->bus_priv;

    return i2c_smbus_write_byte_data(c, reg, value);

}