mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
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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