gpio-tps65912.c

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/*
 * Copyright 2011 Texas Instruments Inc.
 *
 * Author: Margarita Olaya <[email protected]>
 *
 *  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 driver is based on wm8350 implementation.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/mfd/core.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/mfd/tps65912.h>

struct tps65912_gpio_data {
    struct tps65912 *tps65912;
    struct gpio_chip gpio_chip;
};

static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
{
    struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
    int val;

    val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset);

    if (val & GPIO_STS_MASK)
        return 1;

    return 0;
}

static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
                  int value)
{
    struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);

    if (value)
        tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
                            GPIO_SET_MASK);
    else
        tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
                                GPIO_SET_MASK);
}

static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
                int value)
{
    struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);

    /* Set the initial value */
    tps65912_gpio_set(gc, offset, value);

    return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
                                GPIO_CFG_MASK);
}

static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
{
    struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);

    return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
                                GPIO_CFG_MASK);
}

static struct gpio_chip template_chip = {
    .label          = "tps65912",
    .owner          = THIS_MODULE,
    .direction_input    = tps65912_gpio_input,
    .direction_output   = tps65912_gpio_output,
    .get            = tps65912_gpio_get,
    .set            = tps65912_gpio_set,
    .can_sleep      = 1,
    .ngpio          = 5,
    .base           = -1,
};

static int __devinit tps65912_gpio_probe(struct platform_device *pdev)
{
    struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
    struct tps65912_board *pdata = tps65912->dev->platform_data;
    struct tps65912_gpio_data *tps65912_gpio;
    int ret;

    tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio),
                     GFP_KERNEL);
    if (tps65912_gpio == NULL)
        return -ENOMEM;

    tps65912_gpio->tps65912 = tps65912;
    tps65912_gpio->gpio_chip = template_chip;
    tps65912_gpio->gpio_chip.dev = &pdev->dev;
    if (pdata && pdata->gpio_base)
        tps65912_gpio->gpio_chip.base = pdata->gpio_base;

    ret = gpiochip_add(&tps65912_gpio->gpio_chip);
    if (ret < 0) {
        dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
        return ret;
    }

    platform_set_drvdata(pdev, tps65912_gpio);

    return ret;
}

static int __devexit tps65912_gpio_remove(struct platform_device *pdev)
{
    struct tps65912_gpio_data  *tps65912_gpio = platform_get_drvdata(pdev);

    return gpiochip_remove(&tps65912_gpio->gpio_chip);
}

static struct platform_driver tps65912_gpio_driver = {
    .driver = {
        .name = "tps65912-gpio",
        .owner = THIS_MODULE,
    },
    .probe = tps65912_gpio_probe,
    .remove = __devexit_p(tps65912_gpio_remove),
};

static int __init tps65912_gpio_init(void)
{
    return platform_driver_register(&tps65912_gpio_driver);
}
subsys_initcall(tps65912_gpio_init);

static void __exit tps65912_gpio_exit(void)
{
    platform_driver_unregister(&tps65912_gpio_driver);
}
module_exit(tps65912_gpio_exit);

MODULE_AUTHOR("Margarita Olaya Cabrera <[email protected]>");
MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65912-gpio");