93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Toggles a GPIO pin to power down a device
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*
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* Created using the Linux driver as reference, which
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* has been written by:
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*
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* Jamie Lentin <jm@lentin.co.uk>
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* Andrew Lunn <andrew@lunn.ch>
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*
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* Copyright (C) 2012 Jamie Lentin
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <log.h>
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#include <sysreset.h>
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#include <asm/gpio.h>
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#include <linux/delay.h>
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struct poweroff_gpio_info {
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struct gpio_desc gpio;
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u32 active_delay_ms;
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u32 inactive_delay_ms;
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u32 timeout_ms;
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};
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static int poweroff_gpio_request(struct udevice *dev, enum sysreset_t type)
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{
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struct poweroff_gpio_info *priv = dev_get_priv(dev);
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int r;
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if (type != SYSRESET_POWER_OFF)
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return -ENOSYS;
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debug("GPIO poweroff\n");
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/* drive it active, also inactive->active edge */
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r = dm_gpio_set_value(&priv->gpio, 1);
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if (r < 0)
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return r;
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mdelay(priv->active_delay_ms);
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/* drive inactive, also active->inactive edge */
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r = dm_gpio_set_value(&priv->gpio, 0);
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if (r < 0)
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return r;
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mdelay(priv->inactive_delay_ms);
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/* drive it active, also inactive->active edge */
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r = dm_gpio_set_value(&priv->gpio, 1);
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if (r < 0)
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return r;
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/* give it some time */
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mdelay(priv->timeout_ms);
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return -EINPROGRESS;
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}
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static int poweroff_gpio_probe(struct udevice *dev)
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{
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struct poweroff_gpio_info *priv = dev_get_priv(dev);
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int flags;
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flags = dev_read_bool(dev, "input") ? GPIOD_IS_IN : GPIOD_IS_OUT;
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priv->active_delay_ms = dev_read_u32_default(dev, "active-delay-ms", 100);
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priv->inactive_delay_ms = dev_read_u32_default(dev, "inactive-delay-ms", 100);
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priv->timeout_ms = dev_read_u32_default(dev, "timeout-ms", 3000);
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return gpio_request_by_name(dev, "gpios", 0, &priv->gpio, flags);
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}
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static struct sysreset_ops poweroff_gpio_ops = {
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.request = poweroff_gpio_request,
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};
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static const struct udevice_id poweroff_gpio_ids[] = {
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{ .compatible = "gpio-poweroff", },
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{},
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};
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U_BOOT_DRIVER(poweroff_gpio) = {
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.name = "poweroff-gpio",
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.id = UCLASS_SYSRESET,
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.ops = &poweroff_gpio_ops,
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.probe = poweroff_gpio_probe,
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.priv_auto = sizeof(struct poweroff_gpio_info),
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.of_match = poweroff_gpio_ids,
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};
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