Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Force-disables a regulator to power down a device
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*
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* Michael Klein <michael@fossekall.de>
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*
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* Copyright (C) 2020 Michael Klein
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*
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* Based on the gpio-poweroff driver.
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/reboot.h>
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#include <linux/regulator/consumer.h>
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#define TIMEOUT_MS 3000
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static int regulator_poweroff_do_poweroff(struct sys_off_data *data)
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{
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struct regulator *cpu_regulator = data->cb_data;
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if (cpu_regulator && regulator_is_enabled(cpu_regulator))
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regulator_force_disable(cpu_regulator);
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/* give it some time */
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mdelay(TIMEOUT_MS);
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WARN_ON(1);
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return NOTIFY_DONE;
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}
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static int regulator_poweroff_probe(struct platform_device *pdev)
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{
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struct regulator *cpu_regulator;
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cpu_regulator = devm_regulator_get(&pdev->dev, "cpu");
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if (IS_ERR(cpu_regulator))
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return PTR_ERR(cpu_regulator);
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/* Set this handler to low priority to not override an existing handler */
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return devm_register_sys_off_handler(&pdev->dev,
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SYS_OFF_MODE_POWER_OFF,
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SYS_OFF_PRIO_LOW,
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regulator_poweroff_do_poweroff,
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cpu_regulator);
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}
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static const struct of_device_id of_regulator_poweroff_match[] = {
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{ .compatible = "regulator-poweroff", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_regulator_poweroff_match);
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static struct platform_driver regulator_poweroff_driver = {
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.probe = regulator_poweroff_probe,
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.driver = {
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.name = "poweroff-regulator",
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.of_match_table = of_regulator_poweroff_match,
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},
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};
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module_platform_driver(regulator_poweroff_driver);
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MODULE_AUTHOR("Michael Klein <michael@fossekall.de>");
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MODULE_DESCRIPTION("Regulator poweroff driver");
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MODULE_ALIAS("platform:poweroff-regulator");
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