mirror of https://gitee.com/openkylin/linux.git
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*
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* Power off driver for ams AS3722 device.
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*
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* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/mfd/as3722.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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struct as3722_poweroff {
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struct device *dev;
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struct as3722 *as3722;
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};
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static struct as3722_poweroff *as3722_pm_poweroff;
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static void as3722_pm_power_off(void)
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{
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int ret;
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if (!as3722_pm_poweroff) {
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pr_err("AS3722 poweroff is not initialised\n");
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return;
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}
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ret = as3722_update_bits(as3722_pm_poweroff->as3722,
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AS3722_RESET_CONTROL_REG, AS3722_POWER_OFF, AS3722_POWER_OFF);
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if (ret < 0)
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dev_err(as3722_pm_poweroff->dev,
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"RESET_CONTROL_REG update failed, %d\n", ret);
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}
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static int as3722_poweroff_probe(struct platform_device *pdev)
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{
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struct as3722_poweroff *as3722_poweroff;
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struct device_node *np = pdev->dev.parent->of_node;
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if (!np)
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return -EINVAL;
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if (!of_property_read_bool(np, "ams,system-power-controller"))
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return 0;
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as3722_poweroff = devm_kzalloc(&pdev->dev, sizeof(*as3722_poweroff),
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GFP_KERNEL);
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if (!as3722_poweroff)
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return -ENOMEM;
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as3722_poweroff->as3722 = dev_get_drvdata(pdev->dev.parent);
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as3722_poweroff->dev = &pdev->dev;
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as3722_pm_poweroff = as3722_poweroff;
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if (!pm_power_off)
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pm_power_off = as3722_pm_power_off;
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return 0;
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}
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static int as3722_poweroff_remove(struct platform_device *pdev)
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{
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if (pm_power_off == as3722_pm_power_off)
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pm_power_off = NULL;
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as3722_pm_poweroff = NULL;
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return 0;
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}
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static struct platform_driver as3722_poweroff_driver = {
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.driver = {
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.name = "as3722-power-off",
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.owner = THIS_MODULE,
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},
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.probe = as3722_poweroff_probe,
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.remove = as3722_poweroff_remove,
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};
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module_platform_driver(as3722_poweroff_driver);
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MODULE_DESCRIPTION("Power off driver for ams AS3722 PMIC Device");
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MODULE_ALIAS("platform:as3722-power-off");
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_LICENSE("GPL v2");
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