linux-imx

/*

 * i2c-smbus.c - SMBus extensions to the I2C protocol

 *

 * Copyright (C) 2008 David Brownell

 * Copyright (C) 2010 Jean Delvare <jdelvare@suse.de>

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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.

 */

​

#include <linux/device.h>

#include <linux/i2c.h>

#include <linux/i2c-smbus.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of_irq.h>

#include <linux/slab.h>

#include <linux/workqueue.h>

​

struct i2c_smbus_alert {

    struct work_struct  alert;

    struct i2c_client   *ara;       /* Alert response address */

};

​

struct alert_data {

    unsigned short      addr;

    enum i2c_alert_protocol type;

    unsigned int        data;

};

​

/* If this is the alerting device, notify its driver */

static int smbus_do_alert(struct device *dev, void *addrp)

{

    struct i2c_client *client = i2c_verify_client(dev);

    struct alert_data *data = addrp;

    struct i2c_driver *driver;

​

    if (!client || client->addr != data->addr)

        return 0;

    if (client->flags & I2C_CLIENT_TEN)

        return 0;

​

    /*

     * Drivers should either disable alerts, or provide at least

     * a minimal handler.  Lock so the driver won't change.

     */

    device_lock(dev);

    if (client->dev.driver) {

        driver = to_i2c_driver(client->dev.driver);

        if (driver->alert)

            driver->alert(client, data->type, data->data);

        else

            dev_warn(&client->dev, "no driver alert()!\n");

    } else

        dev_dbg(&client->dev, "alert with no driver\n");