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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <sbi/sbi_error.h>
#include <sbi_utils/gpio/gpio.h>
static SBI_LIST_HEAD(gpio_chip_list);
struct gpio_chip *gpio_chip_find(unsigned int id)
{
struct sbi_dlist *pos;
sbi_list_for_each(pos, &(gpio_chip_list)) {
struct gpio_chip *chip = to_gpio_chip(pos);
if (chip->id == id)
return chip;
}
return NULL;
}
int gpio_chip_add(struct gpio_chip *gc)
{
if (!gc)
return SBI_EINVAL;
if (gpio_chip_find(gc->id))
return SBI_EALREADY;
sbi_list_add(&(gc->node), &(gpio_chip_list));
return 0;
}
void gpio_chip_remove(struct gpio_chip *gc)
{
if (!gc)
return;
sbi_list_del(&(gc->node));
}
int gpio_get_direction(struct gpio_pin *gp)
{
if (!gp || !gp->chip || (gp->chip->ngpio <= gp->offset))
return SBI_EINVAL;
if (!gp->chip->get_direction)
return SBI_ENOSYS;
return gp->chip->get_direction(gp);
}
int gpio_direction_input(struct gpio_pin *gp)
{
if (!gp || !gp->chip || (gp->chip->ngpio <= gp->offset))
return SBI_EINVAL;
if (!gp->chip->direction_input)
return SBI_ENOSYS;
return gp->chip->direction_input(gp);
}
int gpio_direction_output(struct gpio_pin *gp, int value)
{
if (!gp || !gp->chip || (gp->chip->ngpio <= gp->offset))
return SBI_EINVAL;
if (!gp->chip->direction_output)
return SBI_ENOSYS;
if (gp->flags & GPIO_FLAG_ACTIVE_LOW)
value = value == 0 ? 1 : 0;
return gp->chip->direction_output(gp, value);
}
int gpio_get(struct gpio_pin *gp)
{
int value;
if (!gp || !gp->chip || (gp->chip->ngpio <= gp->offset))
return SBI_EINVAL;
if (!gp->chip->get)
return SBI_ENOSYS;
value = gp->chip->get(gp);
if (gp->flags & GPIO_FLAG_ACTIVE_LOW)
value = value == 0 ? 1 : 0;
return value;
}
int gpio_set(struct gpio_pin *gp, int value)
{
if (!gp || !gp->chip || (gp->chip->ngpio <= gp->offset))
return SBI_EINVAL;
if (!gp->chip->set)
return SBI_ENOSYS;
if (gp->flags & GPIO_FLAG_ACTIVE_LOW)
value = value == 0 ? 1 : 0;
gp->chip->set(gp, value);
return 0;
}
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