cma3000_d0x_i2c.c

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/*
 * Implements I2C interface for VTI CMA300_D0x Accelerometer driver
 *
 * Copyright (C) 2010 Texas Instruments
 * Author: Hemanth V <[email protected]>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/input/cma3000.h>
#include "cma3000_d0x.h"

static int cma3000_i2c_set(struct device *dev,
               u8 reg, u8 val, char *msg)
{
    struct i2c_client *client = to_i2c_client(dev);
    int ret;

    ret = i2c_smbus_write_byte_data(client, reg, val);
    if (ret < 0)
        dev_err(&client->dev,
            "%s failed (%s, %d)\n", __func__, msg, ret);
    return ret;
}

static int cma3000_i2c_read(struct device *dev, u8 reg, char *msg)
{
    struct i2c_client *client = to_i2c_client(dev);
    int ret;

    ret = i2c_smbus_read_byte_data(client, reg);
    if (ret < 0)
        dev_err(&client->dev,
            "%s failed (%s, %d)\n", __func__, msg, ret);
    return ret;
}

static const struct cma3000_bus_ops cma3000_i2c_bops = {
    .bustype    = BUS_I2C,
#define CMA3000_BUSI2C     (0 << 4)
    .ctrl_mod   = CMA3000_BUSI2C,
    .read       = cma3000_i2c_read,
    .write      = cma3000_i2c_set,
};

static int __devinit cma3000_i2c_probe(struct i2c_client *client,
                    const struct i2c_device_id *id)
{
    struct cma3000_accl_data *data;

    data = cma3000_init(&client->dev, client->irq, &cma3000_i2c_bops);
    if (IS_ERR(data))
        return PTR_ERR(data);

    i2c_set_clientdata(client, data);

    return 0;
}

static int __devexit cma3000_i2c_remove(struct i2c_client *client)
{
    struct cma3000_accl_data *data = i2c_get_clientdata(client);

    cma3000_exit(data);

    return 0;
}

#ifdef CONFIG_PM
static int cma3000_i2c_suspend(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct cma3000_accl_data *data = i2c_get_clientdata(client);

    cma3000_suspend(data);

    return 0;
}

static int cma3000_i2c_resume(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct cma3000_accl_data *data = i2c_get_clientdata(client);

    cma3000_resume(data);

    return 0;
}

static const struct dev_pm_ops cma3000_i2c_pm_ops = {
    .suspend    = cma3000_i2c_suspend,
    .resume     = cma3000_i2c_resume,
};
#endif

static const struct i2c_device_id cma3000_i2c_id[] = {
    { "cma3000_d01", 0 },
    { },
};

MODULE_DEVICE_TABLE(i2c, cma3000_i2c_id);

static struct i2c_driver cma3000_i2c_driver = {
    .probe      = cma3000_i2c_probe,
    .remove     = __devexit_p(cma3000_i2c_remove),
    .id_table   = cma3000_i2c_id,
    .driver = {
        .name   = "cma3000_i2c_accl",
        .owner  = THIS_MODULE,
#ifdef CONFIG_PM
        .pm = &cma3000_i2c_pm_ops,
#endif
    },
};

module_i2c_driver(cma3000_i2c_driver);

MODULE_DESCRIPTION("CMA3000-D0x Accelerometer I2C Driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Hemanth V <[email protected]>");