linux-imx

/*

 * AD714X CapTouch Programmable Controller driver (I2C bus)

 *

 * Copyright 2009-2011 Analog Devices Inc.

 *

 * Licensed under the GPL-2 or later.

 */

​

#include <linux/input.h>    /* BUS_I2C */

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/types.h>

#include <linux/pm.h>

#include "ad714x.h"

​

static int __maybe_unused ad714x_i2c_suspend(struct device *dev)

{

    return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));

}

​

static int __maybe_unused ad714x_i2c_resume(struct device *dev)

{

    return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));

}

​

static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);

​

static int ad714x_i2c_write(struct ad714x_chip *chip,

                unsigned short reg, unsigned short data)

{

    struct i2c_client *client = to_i2c_client(chip->dev);

    int error;

​

    chip->xfer_buf[0] = cpu_to_be16(reg);

    chip->xfer_buf[1] = cpu_to_be16(data);

​

    error = i2c_master_send(client, (u8 *)chip->xfer_buf,

                2 * sizeof(*chip->xfer_buf));

    if (unlikely(error < 0)) {

        dev_err(&client->dev, "I2C write error: %d\n", error);

        return error;

    }

​

    return 0;

}

​

static int ad714x_i2c_read(struct ad714x_chip *chip,

               unsigned short reg, unsigned short *data, size_t len)

{

    struct i2c_client *client = to_i2c_client(chip->dev);

    int i;

    int error;

​

    chip->xfer_buf[0] = cpu_to_be16(reg);

​

    error = i2c_master_send(client, (u8 *)chip->xfer_buf,

                sizeof(*chip->xfer_buf));

    if (error >= 0)

        error = i2c_master_recv(client, (u8 *)chip->xfer_buf,

                    len * sizeof(*chip->xfer_buf));

​

    if (unlikely(error < 0)) {

        dev_err(&client->dev, "I2C read error: %d\n", error);