117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 MediaTek Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/cpuidle.h>
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#include <linux/soc/mediatek/mtk-lpm.h>
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#define MTK_PWR_CONSERVATION_PREPARE (0)
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#define MTK_PWR_CONSERVATION_RESUME (1)
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typedef int (*mtk_pwr_conservation_fn)(int type,
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struct cpuidle_driver *drv,
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int index);
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static struct mtk_cpuidle_op *mtk_lpm_ops __read_mostly;
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int mtk_lpm_drv_cpuidle_ops_set(struct mtk_cpuidle_op *op)
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{
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int ret = 0;
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cpuidle_pause_and_lock();
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if ((!op && mtk_lpm_ops) || (op && !mtk_lpm_ops))
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rcu_assign_pointer(mtk_lpm_ops, op);
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else
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ret = -EACCES;
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cpuidle_resume_and_unlock();
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return ret;
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}
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EXPORT_SYMBOL(mtk_lpm_drv_cpuidle_ops_set);
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int mtk_lpm_pwr_conservation(int type,
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struct cpuidle_driver *drv,
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int index)
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{
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int ret = -EBADR;
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if (!mtk_lpm_ops)
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return ret;
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switch (type) {
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case MTK_PWR_CONSERVATION_PREPARE:
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if (mtk_lpm_ops->cpuidle_prepare)
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ret = mtk_lpm_ops->cpuidle_prepare(drv, index);
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break;
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case MTK_PWR_CONSERVATION_RESUME:
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if (mtk_lpm_ops->cpuidle_resume)
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mtk_lpm_ops->cpuidle_resume(drv, index);
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ret = 0;
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break;
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default:
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break;
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}
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return ret;
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}
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static int mtk_lp_pm_driver_probe(struct platform_device *pdev)
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{
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struct platform_device *mtk_cpuidle_pm_dev;
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int ret = -ENOMEM;
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mtk_pwr_conservation_fn mtk_lpm_pwr = mtk_lpm_pwr_conservation;
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mtk_cpuidle_pm_dev =
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platform_device_alloc(MTK_CPUIDLE_PM_NAME, -1);
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if (!mtk_cpuidle_pm_dev)
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goto out_probe_alloc_fail;
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mtk_cpuidle_pm_dev->dev.parent = &pdev->dev;
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ret = platform_device_add(mtk_cpuidle_pm_dev);
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if (ret)
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goto put_device;
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ret = platform_device_add_data(mtk_cpuidle_pm_dev,
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&mtk_lpm_pwr,
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sizeof(mtk_lpm_pwr));
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if (ret)
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goto put_device;
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device_init_wakeup(&mtk_cpuidle_pm_dev->dev, true);
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return 0;
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put_device:
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platform_device_put(mtk_cpuidle_pm_dev);
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out_probe_alloc_fail:
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return ret;
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}
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static const struct of_device_id of_mtk_lp_pm_match[] = {
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{ .compatible = "mediatek,mtk-lpm" },
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{}
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};
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static struct platform_driver mtk_lp_pm_driver = {
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.probe = mtk_lp_pm_driver_probe,
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.driver = {
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.name = "mtk_lpm_driver",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(of_mtk_lp_pm_match),
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},
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};
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builtin_platform_driver(mtk_lp_pm_driver);
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