drivers/gpio/gpio-tps65910.c

/*
 * TI TPS6591x GPIO driver
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 * Author: Jorge Eduardo Candelaria jedu@slimlogic.co.uk>
 *
 *  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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/mfd/tps65910.h>

static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
	uint8_t val;

	tps65910->read(tps65910, TPS65910_GPIO0 + offset, 1, &val);

	if (val & GPIO_STS_MASK)
		return 1;

	return 0;
}

static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
			      int value)
{
	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);

	if (value)
		tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_SET_MASK);
	else
		tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_SET_MASK);
}

static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
				int value)
{
	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);

	/* Set the initial value */
	tps65910_gpio_set(gc, 0, value);

	return tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_CFG_MASK);
}

static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
{
	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);

	return tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,
						GPIO_CFG_MASK);
}

void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
{
	int ret;

	if (!gpio_base)
		return;

	tps65910->gpio.owner		= THIS_MODULE;
	tps65910->gpio.label		= tps65910->i2c_client->name;
	tps65910->gpio.dev		= tps65910->dev;
	tps65910->gpio.base		= gpio_base;

	switch(tps65910_chip_id(tps65910)) {
	case TPS65910:
		tps65910->gpio.ngpio	= 6;
		break;
	case TPS65911:
		tps65910->gpio.ngpio	= 9;
		break;
	default:
		return;
	}
	tps65910->gpio.can_sleep	= 1;

	tps65910->gpio.direction_input	= tps65910_gpio_input;
	tps65910->gpio.direction_output	= tps65910_gpio_output;
	tps65910->gpio.set		= tps65910_gpio_set;
	tps65910->gpio.get		= tps65910_gpio_get;

	ret = gpiochip_add(&tps65910->gpio);

	if (ret)
		dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);
}