// SPDX-License-Identifier: GPL-2.0-only/* * TI LP8788 MFD - rtc driver * * Copyright 2012 Texas Instruments * * Author: Milo(Woogyom) Kim <milo.kim@ti.com> */ #include <linux/err.h>#include <linux/irqdomain.h>#include <linux/mfd/lp8788.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/rtc.h>#include <linux/slab.h> /* register address */#define LP8788_INTEN_3			0x05#define LP8788_RTC_UNLOCK		0x64#define LP8788_RTC_SEC			0x70#define LP8788_ALM1_SEC			0x77#define LP8788_ALM1_EN			0x7D#define LP8788_ALM2_SEC			0x7E#define LP8788_ALM2_EN			0x84 /* mask/shift bits */#define LP8788_INT_RTC_ALM1_M		BIT(1)	/* Addr 05h */#define LP8788_INT_RTC_ALM1_S		1#define LP8788_INT_RTC_ALM2_M		BIT(2)	/* Addr 05h */#define LP8788_INT_RTC_ALM2_S		2#define LP8788_ALM_EN_M			BIT(7)	/* Addr 7Dh or 84h */#define LP8788_ALM_EN_S			7 #define DEFAULT_ALARM_SEL		LP8788_ALARM_1#define LP8788_MONTH_OFFSET		1#define LP8788_BASE_YEAR		2000#define MAX_WDAY_BITS			7#define LP8788_WDAY_SET			1#define RTC_UNLOCK			0x1#define RTC_LATCH			0x2#define ALARM_IRQ_FLAG			(RTC_IRQF | RTC_AF) enum lp8788_time {	LPTIME_SEC,	LPTIME_MIN,	LPTIME_HOUR,	LPTIME_MDAY,	LPTIME_MON,	LPTIME_YEAR,	LPTIME_WDAY,	LPTIME_MAX,}; struct lp8788_rtc {	struct lp8788 *lp;	struct rtc_device *rdev;	enum lp8788_alarm_sel alarm;	int irq;}; static const u8 addr_alarm_sec[LP8788_ALARM_MAX] = {	LP8788_ALM1_SEC,	LP8788_ALM2_SEC,}; static const u8 addr_alarm_en[LP8788_ALARM_MAX] = {	LP8788_ALM1_EN,	LP8788_ALM2_EN,}; static const u8 mask_alarm_en[LP8788_ALARM_MAX] = {	LP8788_INT_RTC_ALM1_M,	LP8788_INT_RTC_ALM2_M,}; static const u8 shift_alarm_en[LP8788_ALARM_MAX] = {	LP8788_INT_RTC_ALM1_S,	LP8788_INT_RTC_ALM2_S,}; static int _to_tm_wday(u8 lp8788_wday){	int i; 	if (lp8788_wday == 0)		return 0; 	/* lookup defined weekday from read register value */	for (i = 0; i < MAX_WDAY_BITS; i++) {		if ((lp8788_wday >> i) == LP8788_WDAY_SET)			break;	} 	return i + 1;} static inline int _to_lp8788_wday(int tm_wday){	return LP8788_WDAY_SET << (tm_wday - 1);} static void lp8788_rtc_unlock(struct lp8788 *lp){	lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_UNLOCK);	lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_LATCH);} static int lp8788_rtc_read_time(struct device *dev, struct rtc_time *tm){	struct lp8788_rtc *rtc = dev_get_drvdata(dev);	struct lp8788 *lp = rtc->lp;	u8 data[LPTIME_MAX];	int ret; 	lp8788_rtc_unlock(lp); 	ret = lp8788_read_multi_bytes(lp, LP8788_RTC_SEC, data,	LPTIME_MAX);	if (ret)		return ret; 	tm->tm_sec  = data[LPTIME_SEC];	tm->tm_min  = data[LPTIME_MIN];	tm->tm_hour = data[LPTIME_HOUR];	tm->tm_mday = data[LPTIME_MDAY];	tm->tm_mon  = data[LPTIME_MON] - LP8788_MONTH_OFFSET;	tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;	tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]); 	return 0;} static int lp8788_rtc_set_time(struct device *dev, struct rtc_time *tm){	struct lp8788_rtc *rtc = dev_get_drvdata(dev);	struct lp8788 *lp = rtc->lp;	u8 data[LPTIME_MAX - 1];	int ret, i, year; 	year = tm->tm_year + 1900 - LP8788_BASE_YEAR;	if (year < 0) {		dev_err(lp->dev, "invalid year: %d\n", year);		return -EINVAL;	} 	/* because rtc weekday is a readonly register, do not update */	data[LPTIME_SEC]  = tm->tm_sec;	data[LPTIME_MIN]  = tm->tm_min;	data[LPTIME_HOUR] = tm->tm_hour;	data[LPTIME_MDAY] = tm->tm_mday;	data[LPTIME_MON]  = tm->tm_mon + LP8788_MONTH_OFFSET;	data[LPTIME_YEAR] = year; 	for (i = 0; i < ARRAY_SIZE(data); i++) {		ret = lp8788_write_byte(lp, LP8788_RTC_SEC + i, data[i]);		if (ret)			return ret;	} 	return 0;} static int lp8788_read_alarm(struct device *dev, struct rtc_wkalrm *alarm){	struct lp8788_rtc *rtc = dev_get_drvdata(dev);	struct lp8788 *lp = rtc->lp;	struct rtc_time *tm = &alarm->time;	u8 addr, data[LPTIME_MAX];	int ret; 	addr = addr_alarm_sec[rtc->alarm];	ret = lp8788_read_multi_bytes(lp, addr, data, LPTIME_MAX);	if (ret)		return ret; 	tm->tm_sec  = data[LPTIME_SEC];	tm->tm_min  = data[LPTIME_MIN];	tm->tm_hour = data[LPTIME_HOUR];	tm->tm_mday = data[LPTIME_MDAY];	tm->tm_mon  = data[LPTIME_MON] - LP8788_MONTH_OFFSET;	tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900;	tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]);	alarm->enabled = data[LPTIME_WDAY] & LP8788_ALM_EN_M; 	return 0;} static int lp8788_set_alarm(struct device *dev, struct rtc_wkalrm *alarm){	struct lp8788_rtc *rtc = dev_get_drvdata(dev);	struct lp8788 *lp = rtc->lp;	struct rtc_time *tm = &alarm->time;	u8 addr, data[LPTIME_MAX];	int ret, i, year; 	year = tm->tm_year + 1900 - LP8788_BASE_YEAR;	if (year < 0) {		dev_err(lp->dev, "invalid year: %d\n", year);		return -EINVAL;	} 	data[LPTIME_SEC]  = tm->tm_sec;	data[LPTIME_MIN]  = tm->tm_min;	data[LPTIME_HOUR] = tm->tm_hour;	data[LPTIME_MDAY] = tm->tm_mday;	data[LPTIME_MON]  = tm->tm_mon + LP8788_MONTH_OFFSET;	data[LPTIME_YEAR] = year;	data[LPTIME_WDAY] = _to_lp8788_wday(tm->tm_wday); 	for (i = 0; i < ARRAY_SIZE(data); i++) {		addr = addr_alarm_sec[rtc->alarm] + i;		ret = lp8788_write_byte(lp, addr, data[i]);		if (ret)			return ret;	} 	alarm->enabled = 1;	addr = addr_alarm_en[rtc->alarm]; 	return lp8788_update_bits(lp, addr, LP8788_ALM_EN_M,				alarm->enabled << LP8788_ALM_EN_S);} static int lp8788_alarm_irq_enable(struct device *dev, unsigned int enable){	struct lp8788_rtc *rtc = dev_get_drvdata(dev);	struct lp8788 *lp = rtc->lp;	u8 mask, shift; 	if (!rtc->irq)		return -EIO; 	mask = mask_alarm_en[rtc->alarm];	shift = shift_alarm_en[rtc->alarm]; 	return lp8788_update_bits(lp, LP8788_INTEN_3, mask, enable << shift);} static const struct rtc_class_ops lp8788_rtc_ops = {	.read_time = lp8788_rtc_read_time,	.set_time = lp8788_rtc_set_time,	.read_alarm = lp8788_read_alarm,	.set_alarm = lp8788_set_alarm,	.alarm_irq_enable = lp8788_alarm_irq_enable,}; static irqreturn_t lp8788_alarm_irq_handler(int irq, void *ptr){	struct lp8788_rtc *rtc = ptr; 	rtc_update_irq(rtc->rdev, 1, ALARM_IRQ_FLAG);	return IRQ_HANDLED;} static int lp8788_alarm_irq_register(struct platform_device *pdev,				struct lp8788_rtc *rtc){	struct resource *r;	struct lp8788 *lp = rtc->lp;	struct irq_domain *irqdm = lp->irqdm;	int irq; 	rtc->irq = 0; 	/* even the alarm IRQ number is not specified, rtc time should work */	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, LP8788_ALM_IRQ);	if (!r)		return 0; 	if (rtc->alarm == LP8788_ALARM_1)		irq = r->start;	else		irq = r->end; 	rtc->irq = irq_create_mapping(irqdm, irq); 	return devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,				lp8788_alarm_irq_handler,				0, LP8788_ALM_IRQ, rtc);} static int lp8788_rtc_probe(struct platform_device *pdev){	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);	struct lp8788_rtc *rtc;	struct device *dev = &pdev->dev; 	rtc = devm_kzalloc(dev, sizeof(struct lp8788_rtc), GFP_KERNEL);	if (!rtc)		return -ENOMEM; 	rtc->lp = lp;	rtc->alarm = lp->pdata ? lp->pdata->alarm_sel : DEFAULT_ALARM_SEL;	platform_set_drvdata(pdev, rtc); 	device_init_wakeup(dev, true); 	rtc->rdev = devm_rtc_device_register(dev, "lp8788_rtc",					&lp8788_rtc_ops, THIS_MODULE);	if (IS_ERR(rtc->rdev)) {		dev_err(dev, "can not register rtc device\n");		return PTR_ERR(rtc->rdev);	} 	if (lp8788_alarm_irq_register(pdev, rtc))		dev_warn(lp->dev, "no rtc irq handler\n"); 	return 0;} static struct platform_driver lp8788_rtc_driver = {	.probe = lp8788_rtc_probe,	.driver = {		.name = LP8788_DEV_RTC,	},};module_platform_driver(lp8788_rtc_driver); MODULE_DESCRIPTION("Texas Instruments LP8788 RTC Driver");MODULE_AUTHOR("Milo Kim");MODULE_LICENSE("GPL");MODULE_ALIAS("platform:lp8788-rtc");