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d930596a3c
This patch implements Power Domain control based on Runtime PM framework. Each Power Domain is represented by a Power Domain device and the devices belong to these Power Domains should be set as a child device of the Power Domain devices. The corresponding drivers of the devices should implement Runtime PM to control the Power Domains. Signed-off-by: Changhwan Youn <chaos.youn at samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
/* linux/arch/arm/plat-samsung/pd.c
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*
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* Copyright (c) 2010 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Samsung Power domain support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/pm_runtime.h>
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#include <plat/pd.h>
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static int samsung_pd_probe(struct platform_device *pdev)
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{
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struct samsung_pd_info *pdata = pdev->dev.platform_data;
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struct device *dev = &pdev->dev;
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if (!pdata) {
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dev_err(dev, "no device data specified\n");
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return -ENOENT;
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}
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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dev_info(dev, "power domain registered\n");
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return 0;
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}
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static int __devexit samsung_pd_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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pm_runtime_disable(dev);
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return 0;
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}
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static int samsung_pd_runtime_suspend(struct device *dev)
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{
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struct samsung_pd_info *pdata = dev->platform_data;
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int ret = 0;
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if (pdata->disable)
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ret = pdata->disable(dev);
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dev_dbg(dev, "suspended\n");
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return ret;
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}
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static int samsung_pd_runtime_resume(struct device *dev)
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{
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struct samsung_pd_info *pdata = dev->platform_data;
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int ret = 0;
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if (pdata->enable)
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ret = pdata->enable(dev);
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dev_dbg(dev, "resumed\n");
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return ret;
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}
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static const struct dev_pm_ops samsung_pd_pm_ops = {
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.runtime_suspend = samsung_pd_runtime_suspend,
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.runtime_resume = samsung_pd_runtime_resume,
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};
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static struct platform_driver samsung_pd_driver = {
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.driver = {
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.name = "samsung-pd",
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.owner = THIS_MODULE,
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.pm = &samsung_pd_pm_ops,
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},
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.probe = samsung_pd_probe,
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.remove = __devexit_p(samsung_pd_remove),
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};
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static int __init samsung_pd_init(void)
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{
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int ret;
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ret = platform_driver_register(&samsung_pd_driver);
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if (ret)
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printk(KERN_ERR "%s: failed to add PD driver\n", __func__);
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return ret;
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}
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arch_initcall(samsung_pd_init);
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