add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/rtc/rtc-lpc32xx.c
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@@ -1,14 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0+
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 /*
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  * Copyright (C) 2010 NXP Semiconductors
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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 as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- *  You should have received a copy of the GNU General Public License along
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- *  with this program; if not, write to the Free Software Foundation, Inc.,
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- *  675 Mass Ave, Cambridge, MA 02139, USA.
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  */
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 #include <linux/kernel.h>
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@@ -47,8 +39,6 @@
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39
 
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 #define LPC32XX_RTC_KEY_ONSW_LOADVAL	0xB5C13F27
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41
 
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-#define RTC_NAME "rtc-lpc32xx"
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-
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 #define rtc_readl(dev, reg) \
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 	__raw_readl((dev)->rtc_base + (reg))
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 #define rtc_writel(dev, reg, val) \
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@@ -68,14 +58,15 @@
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 	struct lpc32xx_rtc *rtc = dev_get_drvdata(dev);
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 	elapsed_sec = rtc_readl(rtc, LPC32XX_RTC_UCOUNT);
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-	rtc_time_to_tm(elapsed_sec, time);
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+	rtc_time64_to_tm(elapsed_sec, time);
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 	return 0;
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 }
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65
 
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-static int lpc32xx_rtc_set_mmss(struct device *dev, unsigned long secs)
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+static int lpc32xx_rtc_set_time(struct device *dev, struct rtc_time *time)
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 {
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 	struct lpc32xx_rtc *rtc = dev_get_drvdata(dev);
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+	u32 secs = rtc_tm_to_time64(time);
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 	u32 tmp;
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 	spin_lock_irq(&rtc->lock);
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@@ -97,7 +88,7 @@
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 {
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 	struct lpc32xx_rtc *rtc = dev_get_drvdata(dev);
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-	rtc_time_to_tm(rtc_readl(rtc, LPC32XX_RTC_MATCH0), &wkalrm->time);
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+	rtc_time64_to_tm(rtc_readl(rtc, LPC32XX_RTC_MATCH0), &wkalrm->time);
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 	wkalrm->enabled = rtc->alarm_enabled;
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 	wkalrm->pending = !!(rtc_readl(rtc, LPC32XX_RTC_INTSTAT) &
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 		LPC32XX_RTC_INTSTAT_MATCH0);
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@@ -111,13 +102,8 @@
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 	struct lpc32xx_rtc *rtc = dev_get_drvdata(dev);
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 	unsigned long alarmsecs;
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 	u32 tmp;
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-	int ret;
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-	ret = rtc_tm_to_time(&wkalrm->time, &alarmsecs);
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-	if (ret < 0) {
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-		dev_warn(dev, "Failed to convert time: %d\n", ret);
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-		return ret;
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-	}
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+	alarmsecs = rtc_tm_to_time64(&wkalrm->time);
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 	spin_lock_irq(&rtc->lock);
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@@ -191,7 +177,7 @@
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 static const struct rtc_class_ops lpc32xx_rtc_ops = {
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 	.read_time		= lpc32xx_rtc_read_time,
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-	.set_mmss		= lpc32xx_rtc_set_mmss,
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+	.set_time		= lpc32xx_rtc_set_time,
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 	.read_alarm		= lpc32xx_rtc_read_alarm,
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 	.set_alarm		= lpc32xx_rtc_set_alarm,
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 	.alarm_irq_enable	= lpc32xx_rtc_alarm_irq_enable,
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@@ -199,25 +185,15 @@
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 static int lpc32xx_rtc_probe(struct platform_device *pdev)
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 {
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-	struct resource *res;
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 	struct lpc32xx_rtc *rtc;
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-	int rtcirq;
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+	int err;
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 	u32 tmp;
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-
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-	rtcirq = platform_get_irq(pdev, 0);
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-	if (rtcirq < 0) {
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-		dev_warn(&pdev->dev, "Can't get interrupt resource\n");
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-		rtcirq = -1;
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-	}
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 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
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 	if (unlikely(!rtc))
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 		return -ENOMEM;
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-	rtc->irq = rtcirq;
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-
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-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	rtc->rtc_base = devm_ioremap_resource(&pdev->dev, res);
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+	rtc->rtc_base = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(rtc->rtc_base))
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 		return PTR_ERR(rtc->rtc_base);
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@@ -256,18 +232,25 @@
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 	platform_set_drvdata(pdev, rtc);
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-	rtc->rtc = devm_rtc_device_register(&pdev->dev, RTC_NAME,
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-					&lpc32xx_rtc_ops, THIS_MODULE);
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-	if (IS_ERR(rtc->rtc)) {
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-		dev_err(&pdev->dev, "Can't get RTC\n");
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+	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
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+	if (IS_ERR(rtc->rtc))
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 		return PTR_ERR(rtc->rtc);
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-	}
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+
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+	rtc->rtc->ops = &lpc32xx_rtc_ops;
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+	rtc->rtc->range_max = U32_MAX;
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+
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+	err = rtc_register_device(rtc->rtc);
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+	if (err)
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+		return err;
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 	/*
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 	 * IRQ is enabled after device registration in case alarm IRQ
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 	 * is pending upon suspend exit.
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 	 */
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-	if (rtc->irq >= 0) {
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+	rtc->irq = platform_get_irq(pdev, 0);
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+	if (rtc->irq < 0) {
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+		dev_warn(&pdev->dev, "Can't get interrupt resource\n");
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+	} else {
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 		if (devm_request_irq(&pdev->dev, rtc->irq,
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 				     lpc32xx_rtc_alarm_interrupt,
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 				     0, pdev->name, rtc) < 0) {
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@@ -277,16 +260,6 @@
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 			device_init_wakeup(&pdev->dev, 1);
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 		}
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 	}
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-
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-	return 0;
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-}
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-
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-static int lpc32xx_rtc_remove(struct platform_device *pdev)
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-{
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-	struct lpc32xx_rtc *rtc = platform_get_drvdata(pdev);
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-
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-	if (rtc->irq >= 0)
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-		device_init_wakeup(&pdev->dev, 0);
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 	return 0;
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 }
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@@ -372,9 +345,8 @@
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 static struct platform_driver lpc32xx_rtc_driver = {
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 	.probe		= lpc32xx_rtc_probe,
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-	.remove		= lpc32xx_rtc_remove,
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 	.driver = {
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-		.name	= RTC_NAME,
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+		.name	= "rtc-lpc32xx",
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 		.pm	= LPC32XX_RTC_PM_OPS,
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 		.of_match_table = of_match_ptr(lpc32xx_rtc_match),
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 	},