98 строки
2.2 KiB
C
98 строки
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Power off through MediaTek PMIC
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*
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* Copyright (C) 2018 MediaTek Inc.
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*
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* Author: Sean Wang <sean.wang@mediatek.com>
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*
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/mt6397/core.h>
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#include <linux/mfd/mt6397/rtc.h>
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struct mt6323_pwrc {
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struct device *dev;
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struct regmap *regmap;
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u32 base;
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};
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static struct mt6323_pwrc *mt_pwrc;
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static void mt6323_do_pwroff(void)
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{
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struct mt6323_pwrc *pwrc = mt_pwrc;
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unsigned int val;
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int ret;
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regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY);
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regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR_MT6323, 1);
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ret = regmap_read_poll_timeout(pwrc->regmap,
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pwrc->base + RTC_BBPU, val,
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!(val & RTC_BBPU_CBUSY),
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MTK_RTC_POLL_DELAY_US,
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MTK_RTC_POLL_TIMEOUT);
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if (ret)
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dev_err(pwrc->dev, "failed to write BBPU: %d\n", ret);
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/* Wait some time until system down, otherwise, notice with a warn */
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mdelay(1000);
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WARN_ONCE(1, "Unable to power off system\n");
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}
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static int mt6323_pwrc_probe(struct platform_device *pdev)
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{
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struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
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struct mt6323_pwrc *pwrc;
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struct resource *res;
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pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);
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if (!pwrc)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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pwrc->base = res->start;
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pwrc->regmap = mt6397_chip->regmap;
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pwrc->dev = &pdev->dev;
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mt_pwrc = pwrc;
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pm_power_off = &mt6323_do_pwroff;
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return 0;
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}
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static int mt6323_pwrc_remove(struct platform_device *pdev)
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{
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if (pm_power_off == &mt6323_do_pwroff)
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pm_power_off = NULL;
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return 0;
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}
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static const struct of_device_id mt6323_pwrc_dt_match[] = {
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{ .compatible = "mediatek,mt6323-pwrc" },
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{},
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};
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MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match);
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static struct platform_driver mt6323_pwrc_driver = {
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.probe = mt6323_pwrc_probe,
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.remove = mt6323_pwrc_remove,
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.driver = {
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.name = "mt6323-pwrc",
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.of_match_table = mt6323_pwrc_dt_match,
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},
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};
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module_platform_driver(mt6323_pwrc_driver);
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MODULE_DESCRIPTION("Poweroff driver for MT6323 PMIC");
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MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
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MODULE_LICENSE("GPL v2");
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