adxl34x-i2c.c

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/*
 * ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface)
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Copyright (C) 2009 Michael Hennerich, 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 "adxl34x.h"

static int adxl34x_smbus_read(struct device *dev, unsigned char reg)
{
    struct i2c_client *client = to_i2c_client(dev);

    return i2c_smbus_read_byte_data(client, reg);
}

static int adxl34x_smbus_write(struct device *dev,
                   unsigned char reg, unsigned char val)
{
    struct i2c_client *client = to_i2c_client(dev);

    return i2c_smbus_write_byte_data(client, reg, val);
}

static int adxl34x_smbus_read_block(struct device *dev,
                    unsigned char reg, int count,
                    void *buf)
{
    struct i2c_client *client = to_i2c_client(dev);

    return i2c_smbus_read_i2c_block_data(client, reg, count, buf);
}

static int adxl34x_i2c_read_block(struct device *dev,
                  unsigned char reg, int count,
                  void *buf)
{
    struct i2c_client *client = to_i2c_client(dev);
    int ret;

    ret = i2c_master_send(client, &reg, 1);
    if (ret < 0)
        return ret;

    ret = i2c_master_recv(client, buf, count);
    if (ret < 0)
        return ret;

    if (ret != count)
        return -EIO;

    return 0;
}

static const struct adxl34x_bus_ops adxl34x_smbus_bops = {
    .bustype    = BUS_I2C,
    .write      = adxl34x_smbus_write,
    .read       = adxl34x_smbus_read,
    .read_block = adxl34x_smbus_read_block,
};

static const struct adxl34x_bus_ops adxl34x_i2c_bops = {
    .bustype    = BUS_I2C,
    .write      = adxl34x_smbus_write,
    .read       = adxl34x_smbus_read,
    .read_block = adxl34x_i2c_read_block,
};

static int __devinit adxl34x_i2c_probe(struct i2c_client *client,
                       const struct i2c_device_id *id)
{
    struct adxl34x *ac;
    int error;

    error = i2c_check_functionality(client->adapter,
            I2C_FUNC_SMBUS_BYTE_DATA);
    if (!error) {
        dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
        return -EIO;
    }

    ac = adxl34x_probe(&client->dev, client->irq, false,
               i2c_check_functionality(client->adapter,
                           I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
                &adxl34x_smbus_bops : &adxl34x_i2c_bops);
    if (IS_ERR(ac))
        return PTR_ERR(ac);

    i2c_set_clientdata(client, ac);

    return 0;
}

static int __devexit adxl34x_i2c_remove(struct i2c_client *client)
{
    struct adxl34x *ac = i2c_get_clientdata(client);

    return adxl34x_remove(ac);
}

#ifdef CONFIG_PM
static int adxl34x_i2c_suspend(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adxl34x *ac = i2c_get_clientdata(client);

    adxl34x_suspend(ac);

    return 0;
}

static int adxl34x_i2c_resume(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct adxl34x *ac = i2c_get_clientdata(client);

    adxl34x_resume(ac);

    return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(adxl34x_i2c_pm, adxl34x_i2c_suspend,
             adxl34x_i2c_resume);

static const struct i2c_device_id adxl34x_id[] = {
    { "adxl34x", 0 },
    { }
};

MODULE_DEVICE_TABLE(i2c, adxl34x_id);

static struct i2c_driver adxl34x_driver = {
    .driver = {
        .name = "adxl34x",
        .owner = THIS_MODULE,
        .pm = &adxl34x_i2c_pm,
    },
    .probe    = adxl34x_i2c_probe,
    .remove   = __devexit_p(adxl34x_i2c_remove),
    .id_table = adxl34x_id,
};

module_i2c_driver(adxl34x_driver);

MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
MODULE_LICENSE("GPL");