isp1301.c

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/*
 * NXP ISP1301 USB transceiver driver
 *
 * Copyright (C) 2012 Roland Stigge
 *
 * Author: Roland Stigge <[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.
 */

#include <linux/module.h>
#include <linux/i2c.h>

#define DRV_NAME        "isp1301"

static const struct i2c_device_id isp1301_id[] = {
    { "isp1301", 0 },
    { }
};

static struct i2c_client *isp1301_i2c_client;

static int isp1301_probe(struct i2c_client *client,
             const struct i2c_device_id *i2c_id)
{
    isp1301_i2c_client = client;
    return 0;
}

static int isp1301_remove(struct i2c_client *client)
{
    return 0;
}

static struct i2c_driver isp1301_driver = {
    .driver = {
        .name = DRV_NAME,
    },
    .probe = isp1301_probe,
    .remove = isp1301_remove,
    .id_table = isp1301_id,
};

module_i2c_driver(isp1301_driver);

static int match(struct device *dev, void *data)
{
    struct device_node *node = (struct device_node *)data;
    return (dev->of_node == node) &&
        (dev->driver == &isp1301_driver.driver);
}

struct i2c_client *isp1301_get_client(struct device_node *node)
{
    if (node) { /* reference of ISP1301 I2C node via DT */
        struct device *dev = bus_find_device(&i2c_bus_type, NULL,
                             node, match);
        if (!dev)
            return NULL;
        return to_i2c_client(dev);
    } else { /* non-DT: only one ISP1301 chip supported */
        return isp1301_i2c_client;
    }
}
EXPORT_SYMBOL_GPL(isp1301_get_client);

MODULE_AUTHOR("Roland Stigge <[email protected]>");
MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
MODULE_LICENSE("GPL");