Orange Pi5 kernel

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