// SPDX-License-Identifier: GPL-2.0-only /* * Power off driver for ams AS3722 device. * * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. * * Author: Laxman Dewangan <ldewangan@nvidia.com> */ #include <linux/mfd/as3722.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/slab.h> struct as3722_poweroff { struct device *dev; struct as3722 *as3722; }; static int as3722_pm_power_off(struct sys_off_data *data) { struct as3722_poweroff *as3722_pm_poweroff = data->cb_data; int ret; ret = as3722_update_bits(as3722_pm_poweroff->as3722, AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF); if (ret < 0) dev_err(as3722_pm_poweroff->dev, "RESET_CONTROL_REG update failed, %d\n", ret); return NOTIFY_DONE; } static int as3722_poweroff_probe(struct platform_device *pdev) { struct as3722_poweroff *as3722_poweroff; struct device_node *np = pdev->dev.parent->of_node; if (!np) return -EINVAL; if (!of_property_read_bool(np, "ams,system-power-controller")) return 0; as3722_poweroff = devm_kzalloc(&pdev->dev, sizeof(*as3722_poweroff), GFP_KERNEL); if (!as3722_poweroff) return -ENOMEM; as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent); as3722_poweroff->dev = &pdev->dev; return devm_register_sys_off_handler(as3722_poweroff->dev, SYS_OFF_MODE_POWER_OFF, SYS_OFF_PRIO_DEFAULT, as3722_pm_power_off, as3722_poweroff); return 0; } static struct platform_driver as3722_poweroff_driver = { .driver = { .name = "as3722-power-off", }, .probe = as3722_poweroff_probe, }; module_platform_driver(as3722_poweroff_driver); MODULE_DESCRIPTION("Power off driver for ams AS3722 PMIC Device"); MODULE_ALIAS("platform:as3722-power-off"); MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");