Support the "regulator-always-on" property for fixed regulators. The regulator gets enabled on probe and subsequent disable calls are ignored. Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/*
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* fixed regulator support
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*
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* Copyright (c) 2014 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <malloc.h>
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#include <init.h>
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#include <regulator.h>
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#include <of.h>
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#include <of_gpio.h>
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#include <gpio.h>
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struct regulator_fixed {
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int gpio;
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int active_low;
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int always_on;
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struct regulator_dev rdev;
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};
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static int regulator_fixed_enable(struct regulator_dev *rdev)
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{
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struct regulator_fixed *fix = container_of(rdev, struct regulator_fixed, rdev);
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if (!gpio_is_valid(fix->gpio))
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return 0;
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return gpio_direction_output(fix->gpio, !fix->active_low);
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}
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static int regulator_fixed_disable(struct regulator_dev *rdev)
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{
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struct regulator_fixed *fix = container_of(rdev, struct regulator_fixed, rdev);
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if (fix->always_on)
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return 0;
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if (!gpio_is_valid(fix->gpio))
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return 0;
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return gpio_direction_output(fix->gpio, fix->active_low);
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}
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static struct regulator_ops fixed_ops = {
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.enable = regulator_fixed_enable,
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.disable = regulator_fixed_disable,
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};
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static int regulator_fixed_probe(struct device_d *dev)
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{
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struct regulator_fixed *fix;
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enum of_gpio_flags gpioflags;
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int ret;
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if (!dev->device_node)
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return -EINVAL;
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fix = xzalloc(sizeof(*fix));
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if (of_get_property(dev->device_node, "gpio", NULL)) {
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fix->gpio = of_get_named_gpio_flags(dev->device_node, "gpio", 0, &gpioflags);
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if (fix->gpio < 0) {
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ret = fix->gpio;
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goto err;
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}
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if (gpioflags & OF_GPIO_ACTIVE_LOW)
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fix->active_low = 1;
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}
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fix->rdev.ops = &fixed_ops;
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if (of_find_property(dev->device_node, "regulator-always-on", NULL)) {
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fix->always_on = 1;
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regulator_fixed_enable(&fix->rdev);
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}
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ret = of_regulator_register(&fix->rdev, dev->device_node);
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if (ret)
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return ret;
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return 0;
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err:
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free(fix);
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return ret;
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}
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static struct of_device_id regulator_fixed_of_ids[] = {
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{ .compatible = "regulator-fixed", },
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{ }
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};
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static struct driver_d regulator_fixed_driver = {
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.name = "regulator-fixed",
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.probe = regulator_fixed_probe,
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.of_compatible = DRV_OF_COMPAT(regulator_fixed_of_ids),
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};
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coredevice_platform_driver(regulator_fixed_driver);
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