| /* |
| * Power off driver for ams AS3722 device. |
| * |
| * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. |
| * |
| * Author: Laxman Dewangan <ldewangan@nvidia.com> |
| * |
| * 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); |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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 <ldewangan@nvidia.com>"); |
| MODULE_LICENSE("GPL v2"); |