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/*
* fixed regulator support
*
* Copyright (c) 2014 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* 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 <common.h>
#include <malloc.h>
#include <init.h>
#include <regulator.h>
#include <of.h>
#include <of_gpio.h>
#include <gpio.h>
struct regulator_fixed {
int gpio;
int active_low;
struct regulator_dev rdev;
};
static int regulator_fixed_enable(struct regulator_dev *rdev)
{
struct regulator_fixed *fix = container_of(rdev, struct regulator_fixed, rdev);
if (!gpio_is_valid(fix->gpio))
return 0;
return gpio_direction_output(fix->gpio, !fix->active_low);
}
static int regulator_fixed_disable(struct regulator_dev *rdev)
{
struct regulator_fixed *fix = container_of(rdev, struct regulator_fixed, rdev);
if (!gpio_is_valid(fix->gpio))
return 0;
return gpio_direction_output(fix->gpio, fix->active_low);
}
static struct regulator_ops fixed_ops = {
.enable = regulator_fixed_enable,
.disable = regulator_fixed_disable,
};
static int regulator_fixed_probe(struct device_d *dev)
{
struct regulator_fixed *fix;
enum of_gpio_flags gpioflags;
int ret;
if (!dev->device_node)
return -EINVAL;
fix = xzalloc(sizeof(*fix));
if (of_get_property(dev->device_node, "gpio", NULL)) {
fix->gpio = of_get_named_gpio_flags(dev->device_node, "gpio", 0, &gpioflags);
if (fix->gpio < 0) {
ret = fix->gpio;
goto err;
}
if (gpioflags & OF_GPIO_ACTIVE_LOW)
fix->active_low = 1;
}
fix->rdev.ops = &fixed_ops;
ret = of_regulator_register(&fix->rdev, dev->device_node);
if (ret)
return ret;
return 0;
err:
free(fix);
return ret;
}
static struct of_device_id regulator_fixed_of_ids[] = {
{ .compatible = "regulator-fixed", },
{ }
};
static struct driver_d regulator_fixed_driver = {
.name = "regulator-fixed",
.probe = regulator_fixed_probe,
.of_compatible = DRV_OF_COMPAT(regulator_fixed_of_ids),
};
coredevice_platform_driver(regulator_fixed_driver);
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