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Release 4.14 drivers/power/reset/as3722-poweroff.c

 * Power off driver for ams AS3722 device.
 * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
 * Author: Laxman Dewangan <>
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.

#include <linux/mfd/as3722.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

struct as3722_poweroff {
struct device *dev;
struct as3722 *as3722;

static struct as3722_poweroff *as3722_pm_poweroff;

static void as3722_pm_power_off(void) { int ret; if (!as3722_pm_poweroff) { pr_err("AS3722 poweroff is not initialised\n"); return; } 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); }


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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; as3722_pm_poweroff = as3722_poweroff; if (!pm_power_off) pm_power_off = as3722_pm_power_off; return 0; }


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static int as3722_poweroff_remove(struct platform_device *pdev) { if (pm_power_off == as3722_pm_power_off) pm_power_off = NULL; as3722_pm_poweroff = NULL; return 0; }


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static struct platform_driver as3722_poweroff_driver = { .driver = { .name = "as3722-power-off", }, .probe = as3722_poweroff_probe, .remove = as3722_poweroff_remove, }; 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 <>"); MODULE_LICENSE("GPL v2");

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