power: reset: new driver regulator-poweroff (ec66096b) · Commits · 戴 / test

drivers/power/reset/Kconfig

+7 −0

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		@@ -177,6 +177,13 @@ config POWER_RESET_QNAP

		Say Y if you have a QNAP NAS.

		config POWER_RESET_REGULATOR
		bool "Regulator subsystem power-off driver"
		depends on OF && REGULATOR
		help
		This driver supports turning off your board by disabling a
		power regulator defined in the devicetree.

		config POWER_RESET_RESTART
		bool "Restart power-off driver"
		help

drivers/power/reset/Makefile

+1 −0

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		@@ -19,6 +19,7 @@ obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
		obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
		obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
		obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
		obj-$(CONFIG_POWER_RESET_REGULATOR) += regulator-poweroff.o
		obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
		obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o
		obj-$(CONFIG_POWER_RESET_VERSATILE) += arm-versatile-reboot.o

drivers/power/reset/regulator-poweroff.c

0 → 100644

+82 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0-only
		/*
		* Force-disables a regulator to power down a device
		*
		* Michael Klein <michael@fossekall.de>
		*
		* Copyright (C) 2020 Michael Klein
		*
		* Based on the gpio-poweroff driver.
		*/
		#include <linux/delay.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/pm.h>
		#include <linux/regulator/consumer.h>

		#define TIMEOUT_MS 3000

		/*
		* Hold configuration here, cannot be more than one instance of the driver
		* since pm_power_off itself is global.
		*/
		static struct regulator *cpu_regulator;

		static void regulator_poweroff_do_poweroff(void)
		{
		if (cpu_regulator && regulator_is_enabled(cpu_regulator))
		regulator_force_disable(cpu_regulator);

		/* give it some time */
		mdelay(TIMEOUT_MS);

		WARN_ON(1);
		}

		static int regulator_poweroff_probe(struct platform_device *pdev)
		{
		/* If a pm_power_off function has already been added, leave it alone */
		if (pm_power_off != NULL) {
		dev_err(&pdev->dev,
		"%s: pm_power_off function already registered\n",
		__func__);
		return -EBUSY;
		}

		cpu_regulator = devm_regulator_get(&pdev->dev, "cpu");
		if (IS_ERR(cpu_regulator))
		return PTR_ERR(cpu_regulator);

		pm_power_off = &regulator_poweroff_do_poweroff;
		return 0;
		}

		static int regulator_poweroff_remove(__maybe_unused struct platform_device *pdev)
		{
		if (pm_power_off == &regulator_poweroff_do_poweroff)
		pm_power_off = NULL;

		return 0;
		}

		static const struct of_device_id of_regulator_poweroff_match[] = {
		{ .compatible = "regulator-poweroff", },
		{},
		};

		static struct platform_driver regulator_poweroff_driver = {
		.probe = regulator_poweroff_probe,
		.remove = regulator_poweroff_remove,
		.driver = {
		.name = "poweroff-regulator",
		.of_match_table = of_regulator_poweroff_match,
		},
		};

		module_platform_driver(regulator_poweroff_driver);

		MODULE_AUTHOR("Michael Klein <michael@fossekall.de>");
		MODULE_DESCRIPTION("Regulator poweroff driver");
		MODULE_LICENSE("GPL v2");
		MODULE_ALIAS("platform:poweroff-regulator");

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