gpio-ucb1400.c

Go to the documentation of this file.

/*
 * Philips UCB1400 GPIO driver
 *
 * Author: Marek Vasut <[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/ucb1400.h>

struct ucb1400_gpio_data *ucbdata;

static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
{
    struct ucb1400_gpio *gpio;
    gpio = container_of(gc, struct ucb1400_gpio, gc);
    ucb1400_gpio_set_direction(gpio->ac97, off, 0);
    return 0;
}

static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
{
    struct ucb1400_gpio *gpio;
    gpio = container_of(gc, struct ucb1400_gpio, gc);
    ucb1400_gpio_set_direction(gpio->ac97, off, 1);
    ucb1400_gpio_set_value(gpio->ac97, off, val);
    return 0;
}

static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
{
    struct ucb1400_gpio *gpio;
    gpio = container_of(gc, struct ucb1400_gpio, gc);
    return ucb1400_gpio_get_value(gpio->ac97, off);
}

static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
{
    struct ucb1400_gpio *gpio;
    gpio = container_of(gc, struct ucb1400_gpio, gc);
    ucb1400_gpio_set_value(gpio->ac97, off, val);
}

static int ucb1400_gpio_probe(struct platform_device *dev)
{
    struct ucb1400_gpio *ucb = dev->dev.platform_data;
    int err = 0;

    if (!(ucbdata && ucbdata->gpio_offset)) {
        err = -EINVAL;
        goto err;
    }

    platform_set_drvdata(dev, ucb);

    ucb->gc.label = "ucb1400_gpio";
    ucb->gc.base = ucbdata->gpio_offset;
    ucb->gc.ngpio = 10;
    ucb->gc.owner = THIS_MODULE;

    ucb->gc.direction_input = ucb1400_gpio_dir_in;
    ucb->gc.direction_output = ucb1400_gpio_dir_out;
    ucb->gc.get = ucb1400_gpio_get;
    ucb->gc.set = ucb1400_gpio_set;
    ucb->gc.can_sleep = 1;

    err = gpiochip_add(&ucb->gc);
    if (err)
        goto err;

    if (ucbdata && ucbdata->gpio_setup)
        err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio);

err:
    return err;

}

static int ucb1400_gpio_remove(struct platform_device *dev)
{
    int err = 0;
    struct ucb1400_gpio *ucb = platform_get_drvdata(dev);

    if (ucbdata && ucbdata->gpio_teardown) {
        err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio);
        if (err)
            return err;
    }

    err = gpiochip_remove(&ucb->gc);
    return err;
}

static struct platform_driver ucb1400_gpio_driver = {
    .probe  = ucb1400_gpio_probe,
    .remove = ucb1400_gpio_remove,
    .driver = {
        .name   = "ucb1400_gpio"
    },
};

void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data)
{
    ucbdata = data;
}

module_platform_driver(ucb1400_gpio_driver);

MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
MODULE_LICENSE("GPL");