[linux-block.git] / drivers / rtc / rtc-wm8350.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Real Time Clock driver for Wolfson Microelectronics WM8350
 *
 *	Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
 *
 *  Author: Liam Girdwood
 *          linux@wolfsonmicro.com
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>
#include <linux/completion.h>
#include <linux/mfd/wm8350/rtc.h>
#include <linux/mfd/wm8350/core.h>
#include <linux/delay.h>
#include <linux/platform_device.h>

#define WM8350_SET_ALM_RETRIES	5
#define WM8350_SET_TIME_RETRIES	5
#define WM8350_GET_TIME_RETRIES	5

/*
 * Read current time and date in RTC
 */
static int wm8350_rtc_readtime(struct device *dev, struct rtc_time *tm)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	u16 time1[4], time2[4];
	int retries = WM8350_GET_TIME_RETRIES, ret;

	/*
	 * Read the time twice and compare.
	 * If time1 == time2, then time is valid else retry.
	 */
	do {
		ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
					4, time1);
		if (ret < 0)
			return ret;
		ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
					4, time2);
		if (ret < 0)
			return ret;

		if (memcmp(time1, time2, sizeof(time1)) == 0) {
			tm->tm_sec = time1[0] & WM8350_RTC_SECS_MASK;

			tm->tm_min = (time1[0] & WM8350_RTC_MINS_MASK)
			    >> WM8350_RTC_MINS_SHIFT;

			tm->tm_hour = time1[1] & WM8350_RTC_HRS_MASK;

			tm->tm_wday = ((time1[1] >> WM8350_RTC_DAY_SHIFT)
				       & 0x7) - 1;

			tm->tm_mon = ((time1[2] & WM8350_RTC_MTH_MASK)
				      >> WM8350_RTC_MTH_SHIFT) - 1;

			tm->tm_mday = (time1[2] & WM8350_RTC_DATE_MASK);

			tm->tm_year = ((time1[3] & WM8350_RTC_YHUNDREDS_MASK)
				       >> WM8350_RTC_YHUNDREDS_SHIFT) * 100;
			tm->tm_year += time1[3] & WM8350_RTC_YUNITS_MASK;

			tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
						    tm->tm_year);
			tm->tm_year -= 1900;

			dev_dbg(dev, "Read (%d left): %04x %04x %04x %04x\n",
				retries,
				time1[0], time1[1], time1[2], time1[3]);

			return 0;
		}
	} while (retries--);

	dev_err(dev, "timed out reading RTC time\n");
	return -EIO;
}

/*
 * Set current time and date in RTC
 */
static int wm8350_rtc_settime(struct device *dev, struct rtc_time *tm)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	u16 time[4];
	u16 rtc_ctrl;
	int ret, retries = WM8350_SET_TIME_RETRIES;

	time[0] = tm->tm_sec;
	time[0] |= tm->tm_min << WM8350_RTC_MINS_SHIFT;
	time[1] = tm->tm_hour;
	time[1] |= (tm->tm_wday + 1) << WM8350_RTC_DAY_SHIFT;
	time[2] = tm->tm_mday;
	time[2] |= (tm->tm_mon + 1) << WM8350_RTC_MTH_SHIFT;
	time[3] = ((tm->tm_year + 1900) / 100) << WM8350_RTC_YHUNDREDS_SHIFT;
	time[3] |= (tm->tm_year + 1900) % 100;

	dev_dbg(dev, "Setting: %04x %04x %04x %04x\n",
		time[0], time[1], time[2], time[3]);

	/* Set RTC_SET to stop the clock */
	ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET);
	if (ret < 0)
		return ret;

	/* Wait until confirmation of stopping */
	do {
		rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
		schedule_timeout_uninterruptible(msecs_to_jiffies(1));
	} while (--retries && !(rtc_ctrl & WM8350_RTC_STS));

	if (!retries) {
		dev_err(dev, "timed out on set confirmation\n");
		return -EIO;
	}

	/* Write time to RTC */
	ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time);
	if (ret < 0)
		return ret;

	/* Clear RTC_SET to start the clock */
	ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
				WM8350_RTC_SET);
	return ret;
}

/*
 * Read alarm time and date in RTC
 */
static int wm8350_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	struct rtc_time *tm = &alrm->time;
	u16 time[4];
	int ret;

	ret = wm8350_block_read(wm8350, WM8350_ALARM_SECONDS_MINUTES, 4, time);
	if (ret < 0)
		return ret;

	tm->tm_sec = time[0] & WM8350_RTC_ALMSECS_MASK;
	if (tm->tm_sec == WM8350_RTC_ALMSECS_MASK)
		tm->tm_sec = -1;

	tm->tm_min = time[0] & WM8350_RTC_ALMMINS_MASK;
	if (tm->tm_min == WM8350_RTC_ALMMINS_MASK)
		tm->tm_min = -1;
	else
		tm->tm_min >>= WM8350_RTC_ALMMINS_SHIFT;

	tm->tm_hour = time[1] & WM8350_RTC_ALMHRS_MASK;
	if (tm->tm_hour == WM8350_RTC_ALMHRS_MASK)
		tm->tm_hour = -1;

	tm->tm_wday = ((time[1] >> WM8350_RTC_ALMDAY_SHIFT) & 0x7) - 1;
	if (tm->tm_wday > 7)
		tm->tm_wday = -1;

	tm->tm_mon = time[2] & WM8350_RTC_ALMMTH_MASK;
	if (tm->tm_mon == WM8350_RTC_ALMMTH_MASK)
		tm->tm_mon = -1;
	else
		tm->tm_mon = (tm->tm_mon >> WM8350_RTC_ALMMTH_SHIFT) - 1;

	tm->tm_mday = (time[2] & WM8350_RTC_ALMDATE_MASK);
	if (tm->tm_mday == WM8350_RTC_ALMDATE_MASK)
		tm->tm_mday = -1;

	tm->tm_year = -1;

	alrm->enabled = !(time[3] & WM8350_RTC_ALMSTS);

	return 0;
}

static int wm8350_rtc_stop_alarm(struct wm8350 *wm8350)
{
	int retries = WM8350_SET_ALM_RETRIES;
	u16 rtc_ctrl;
	int ret;

	/* Set RTC_SET to stop the clock */
	ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
			      WM8350_RTC_ALMSET);
	if (ret < 0)
		return ret;

	/* Wait until confirmation of stopping */
	do {
		rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
		schedule_timeout_uninterruptible(msecs_to_jiffies(1));
	} while (retries-- && !(rtc_ctrl & WM8350_RTC_ALMSTS));

	if (!(rtc_ctrl & WM8350_RTC_ALMSTS))
		return -ETIMEDOUT;

	return 0;
}

static int wm8350_rtc_start_alarm(struct wm8350 *wm8350)
{
	int ret;
	int retries = WM8350_SET_ALM_RETRIES;
	u16 rtc_ctrl;

	ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
				WM8350_RTC_ALMSET);
	if (ret < 0)
		return ret;

	/* Wait until confirmation */
	do {
		rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
		schedule_timeout_uninterruptible(msecs_to_jiffies(1));
	} while (retries-- && rtc_ctrl & WM8350_RTC_ALMSTS);

	if (rtc_ctrl & WM8350_RTC_ALMSTS)
		return -ETIMEDOUT;

	return 0;
}

static int wm8350_rtc_alarm_irq_enable(struct device *dev,
				       unsigned int enabled)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);

	if (enabled)
		return wm8350_rtc_start_alarm(wm8350);
	else
		return wm8350_rtc_stop_alarm(wm8350);
}

static int wm8350_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	struct rtc_time *tm = &alrm->time;
	u16 time[3];
	int ret;

	memset(time, 0, sizeof(time));

	if (tm->tm_sec != -1)
		time[0] |= tm->tm_sec;
	else
		time[0] |= WM8350_RTC_ALMSECS_MASK;

	if (tm->tm_min != -1)
		time[0] |= tm->tm_min << WM8350_RTC_ALMMINS_SHIFT;
	else
		time[0] |= WM8350_RTC_ALMMINS_MASK;

	if (tm->tm_hour != -1)
		time[1] |= tm->tm_hour;
	else
		time[1] |= WM8350_RTC_ALMHRS_MASK;

	if (tm->tm_wday != -1)
		time[1] |= (tm->tm_wday + 1) << WM8350_RTC_ALMDAY_SHIFT;
	else
		time[1] |= WM8350_RTC_ALMDAY_MASK;

	if (tm->tm_mday != -1)
		time[2] |= tm->tm_mday;
	else
		time[2] |= WM8350_RTC_ALMDATE_MASK;

	if (tm->tm_mon != -1)
		time[2] |= (tm->tm_mon + 1) << WM8350_RTC_ALMMTH_SHIFT;
	else
		time[2] |= WM8350_RTC_ALMMTH_MASK;

	ret = wm8350_rtc_stop_alarm(wm8350);
	if (ret < 0)
		return ret;

	/* Write time to RTC */
	ret = wm8350_block_write(wm8350, WM8350_ALARM_SECONDS_MINUTES,
				 3, time);
	if (ret < 0)
		return ret;

	if (alrm->enabled)
		ret = wm8350_rtc_start_alarm(wm8350);

	return ret;
}

static irqreturn_t wm8350_rtc_alarm_handler(int irq, void *data)
{
	struct wm8350 *wm8350 = data;
	struct rtc_device *rtc = wm8350->rtc.rtc;
	int ret;

	rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);

	/* Make it one shot */
	ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
			      WM8350_RTC_ALMSET);
	if (ret != 0) {
		dev_err(&(wm8350->rtc.pdev->dev),
			"Failed to disable alarm: %d\n", ret);
	}

	return IRQ_HANDLED;
}

static irqreturn_t wm8350_rtc_update_handler(int irq, void *data)
{
	struct wm8350 *wm8350 = data;
	struct rtc_device *rtc = wm8350->rtc.rtc;

	rtc_update_irq(rtc, 1, RTC_IRQF | RTC_UF);

	return IRQ_HANDLED;
}

static const struct rtc_class_ops wm8350_rtc_ops = {
	.read_time = wm8350_rtc_readtime,
	.set_time = wm8350_rtc_settime,
	.read_alarm = wm8350_rtc_readalarm,
	.set_alarm = wm8350_rtc_setalarm,
	.alarm_irq_enable = wm8350_rtc_alarm_irq_enable,
};

#ifdef CONFIG_PM_SLEEP
static int wm8350_rtc_suspend(struct device *dev)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	int ret = 0;
	u16 reg;

	reg = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);

	if (device_may_wakeup(&wm8350->rtc.pdev->dev) &&
	    reg & WM8350_RTC_ALMSTS) {
		ret = wm8350_rtc_stop_alarm(wm8350);
		if (ret != 0)
			dev_err(dev, "Failed to stop RTC alarm: %d\n", ret);
	}

	return ret;
}

static int wm8350_rtc_resume(struct device *dev)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	int ret;

	if (wm8350->rtc.alarm_enabled) {
		ret = wm8350_rtc_start_alarm(wm8350);
		if (ret != 0)
			dev_err(dev, "Failed to restart RTC alarm: %d\n", ret);
	}

	return 0;
}
#endif

static int wm8350_rtc_probe(struct platform_device *pdev)
{
	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
	struct wm8350_rtc *wm_rtc = &wm8350->rtc;
	int ret = 0;
	u16 timectl, power5;

	timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
	if (timectl & WM8350_RTC_BCD) {
		dev_err(&pdev->dev, "RTC BCD mode not supported\n");
		return -EINVAL;
	}
	if (timectl & WM8350_RTC_12HR) {
		dev_err(&pdev->dev, "RTC 12 hour mode not supported\n");
		return -EINVAL;
	}

	/* enable the RTC if it's not already enabled */
	power5 = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
	if (!(power5 &  WM8350_RTC_TICK_ENA)) {
		dev_info(wm8350->dev, "Starting RTC\n");

		wm8350_reg_unlock(wm8350);

		ret = wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5,
				      WM8350_RTC_TICK_ENA);
		if (ret < 0) {
			dev_err(&pdev->dev, "failed to enable RTC: %d\n", ret);
			return ret;
		}

		wm8350_reg_lock(wm8350);
	}

	if (timectl & WM8350_RTC_STS) {
		int retries;

		ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
					WM8350_RTC_SET);
		if (ret < 0) {
			dev_err(&pdev->dev, "failed to start: %d\n", ret);
			return ret;
		}

		retries = WM8350_SET_TIME_RETRIES;
		do {
			timectl = wm8350_reg_read(wm8350,
						  WM8350_RTC_TIME_CONTROL);
		} while (timectl & WM8350_RTC_STS && --retries);

		if (retries == 0) {
			dev_err(&pdev->dev, "failed to start: timeout\n");
			return -ENODEV;
		}
	}

	device_init_wakeup(&pdev->dev, 1);

	wm_rtc->rtc = devm_rtc_device_register(&pdev->dev, "wm8350",
					&wm8350_rtc_ops, THIS_MODULE);
	if (IS_ERR(wm_rtc->rtc)) {
		ret = PTR_ERR(wm_rtc->rtc);
		dev_err(&pdev->dev, "failed to register RTC: %d\n", ret);
		return ret;
	}

	ret = wm8350_register_irq(wm8350, WM8350_IRQ_RTC_SEC,
			    wm8350_rtc_update_handler, 0,
			    "RTC Seconds", wm8350);
	if (ret)
		return ret;

	wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);

	ret = wm8350_register_irq(wm8350, WM8350_IRQ_RTC_ALM,
			    wm8350_rtc_alarm_handler, 0,
			    "RTC Alarm", wm8350);
	if (ret) {
		wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
		return ret;
	}

	return 0;
}

static int wm8350_rtc_remove(struct platform_device *pdev)
{
	struct wm8350 *wm8350 = platform_get_drvdata(pdev);

	wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
	wm8350_free_irq(wm8350, WM8350_IRQ_RTC_ALM, wm8350);

	return 0;
}

static SIMPLE_DEV_PM_OPS(wm8350_rtc_pm_ops, wm8350_rtc_suspend,
			wm8350_rtc_resume);

static struct platform_driver wm8350_rtc_driver = {
	.probe = wm8350_rtc_probe,
	.remove = wm8350_rtc_remove,
	.driver = {
		.name = "wm8350-rtc",
		.pm = &wm8350_rtc_pm_ops,
	},
};

module_platform_driver(wm8350_rtc_driver);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("RTC driver for the WM8350");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8350-rtc");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
077eaf5b MB	2	/*
	3	* Real Time Clock driver for Wolfson Microelectronics WM8350
	4	*
	5	* Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
	6	*
	7	* Author: Liam Girdwood
	8	* linux@wolfsonmicro.com
077eaf5b MB	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/kernel.h>
	13	#include <linux/time.h>
	14	#include <linux/rtc.h>
	15	#include <linux/bcd.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/ioctl.h>
	18	#include <linux/completion.h>
	19	#include <linux/mfd/wm8350/rtc.h>
	20	#include <linux/mfd/wm8350/core.h>
	21	#include <linux/delay.h>
	22	#include <linux/platform_device.h>
	23
	24	#define WM8350_SET_ALM_RETRIES 5
	25	#define WM8350_SET_TIME_RETRIES 5
	26	#define WM8350_GET_TIME_RETRIES 5
	27
077eaf5b MB	28	/*
	29	* Read current time and date in RTC
	30	*/
	31	static int wm8350_rtc_readtime(struct device dev, struct rtc_time tm)
	32	{
	33	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	34	u16 time1[4], time2[4];
	35	int retries = WM8350_GET_TIME_RETRIES, ret;
	36
	37	/*
	38	* Read the time twice and compare.
	39	* If time1 == time2, then time is valid else retry.
	40	*/
	41	do {
	42	ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
	43	4, time1);
	44	if (ret < 0)
	45	return ret;
	46	ret = wm8350_block_read(wm8350, WM8350_RTC_SECONDS_MINUTES,
	47	4, time2);
	48	if (ret < 0)
	49	return ret;
	50
	51	if (memcmp(time1, time2, sizeof(time1)) == 0) {
	52	tm->tm_sec = time1[0] & WM8350_RTC_SECS_MASK;
	53
	54	tm->tm_min = (time1[0] & WM8350_RTC_MINS_MASK)
	55	>> WM8350_RTC_MINS_SHIFT;
	56
	57	tm->tm_hour = time1[1] & WM8350_RTC_HRS_MASK;
	58
	59	tm->tm_wday = ((time1[1] >> WM8350_RTC_DAY_SHIFT)
	60	& 0x7) - 1;
	61
	62	tm->tm_mon = ((time1[2] & WM8350_RTC_MTH_MASK)
	63	>> WM8350_RTC_MTH_SHIFT) - 1;
	64
	65	tm->tm_mday = (time1[2] & WM8350_RTC_DATE_MASK);
	66
	67	tm->tm_year = ((time1[3] & WM8350_RTC_YHUNDREDS_MASK)
	68	>> WM8350_RTC_YHUNDREDS_SHIFT) * 100;
	69	tm->tm_year += time1[3] & WM8350_RTC_YUNITS_MASK;
	70
	71	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
	72	tm->tm_year);
	73	tm->tm_year -= 1900;
	74
	75	dev_dbg(dev, "Read (%d left): %04x %04x %04x %04x\n",
	76	retries,
	77	time1[0], time1[1], time1[2], time1[3]);
	78
	79	return 0;
	80	}
	81	} while (retries--);
	82
	83	dev_err(dev, "timed out reading RTC time\n");
	84	return -EIO;
	85	}
	86
	87	/*
	88	* Set current time and date in RTC
	89	*/
	90	static int wm8350_rtc_settime(struct device dev, struct rtc_time tm)
	91	{
92	struct wm8350 *wm8350 = dev_get_drvdata(dev);
93	u16 time[4];
94	u16 rtc_ctrl;
95	int ret, retries = WM8350_SET_TIME_RETRIES;
96
97	time[0] = tm->tm_sec;
98	time[0] \|= tm->tm_min << WM8350_RTC_MINS_SHIFT;
99	time[1] = tm->tm_hour;
100	time[1] \|= (tm->tm_wday + 1) << WM8350_RTC_DAY_SHIFT;
101	time[2] = tm->tm_mday;
102	time[2] \|= (tm->tm_mon + 1) << WM8350_RTC_MTH_SHIFT;
103	time[3] = ((tm->tm_year + 1900) / 100) << WM8350_RTC_YHUNDREDS_SHIFT;
104	time[3] \|= (tm->tm_year + 1900) % 100;
105
106	dev_dbg(dev, "Setting: %04x %04x %04x %04x\n",
107	time[0], time[1], time[2], time[3]);
108
109	/* Set RTC_SET to stop the clock */
110	ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET);
111	if (ret < 0)
112	return ret;
113
114	/* Wait until confirmation of stopping */
115	do {
116	rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
117	schedule_timeout_uninterruptible(msecs_to_jiffies(1));
62da659a	118	} while (--retries && !(rtc_ctrl & WM8350_RTC_STS));
077eaf5b MB	119
	120	if (!retries) {
	121	dev_err(dev, "timed out on set confirmation\n");
	122	return -EIO;
	123	}
	124
	125	/* Write time to RTC */
	126	ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time);
	127	if (ret < 0)
	128	return ret;
	129
	130	/* Clear RTC_SET to start the clock */
	131	ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
	132	WM8350_RTC_SET);
	133	return ret;
	134	}
	135
	136	/*
	137	* Read alarm time and date in RTC
	138	*/
	139	static int wm8350_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	140	{
	141	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	142	struct rtc_time *tm = &alrm->time;
	143	u16 time[4];
	144	int ret;
	145
	146	ret = wm8350_block_read(wm8350, WM8350_ALARM_SECONDS_MINUTES, 4, time);
	147	if (ret < 0)
	148	return ret;
	149
	150	tm->tm_sec = time[0] & WM8350_RTC_ALMSECS_MASK;
	151	if (tm->tm_sec == WM8350_RTC_ALMSECS_MASK)
	152	tm->tm_sec = -1;
	153
	154	tm->tm_min = time[0] & WM8350_RTC_ALMMINS_MASK;
	155	if (tm->tm_min == WM8350_RTC_ALMMINS_MASK)
	156	tm->tm_min = -1;
	157	else
	158	tm->tm_min >>= WM8350_RTC_ALMMINS_SHIFT;
	159
	160	tm->tm_hour = time[1] & WM8350_RTC_ALMHRS_MASK;
	161	if (tm->tm_hour == WM8350_RTC_ALMHRS_MASK)
	162	tm->tm_hour = -1;
	163
	164	tm->tm_wday = ((time[1] >> WM8350_RTC_ALMDAY_SHIFT) & 0x7) - 1;
	165	if (tm->tm_wday > 7)
	166	tm->tm_wday = -1;
	167
	168	tm->tm_mon = time[2] & WM8350_RTC_ALMMTH_MASK;
	169	if (tm->tm_mon == WM8350_RTC_ALMMTH_MASK)
	170	tm->tm_mon = -1;
	171	else
	172	tm->tm_mon = (tm->tm_mon >> WM8350_RTC_ALMMTH_SHIFT) - 1;
	173
	174	tm->tm_mday = (time[2] & WM8350_RTC_ALMDATE_MASK);
	175	if (tm->tm_mday == WM8350_RTC_ALMDATE_MASK)
	176	tm->tm_mday = -1;
	177
	178	tm->tm_year = -1;
	179
	180	alrm->enabled = !(time[3] & WM8350_RTC_ALMSTS);
	181
	182	return 0;
183	}
184
185	static int wm8350_rtc_stop_alarm(struct wm8350 *wm8350)
186	{
187	int retries = WM8350_SET_ALM_RETRIES;
188	u16 rtc_ctrl;
189	int ret;
190
191	/* Set RTC_SET to stop the clock */
192	ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
193	WM8350_RTC_ALMSET);
194	if (ret < 0)
195	return ret;
196
197	/* Wait until confirmation of stopping */
198	do {
199	rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
200	schedule_timeout_uninterruptible(msecs_to_jiffies(1));
201	} while (retries-- && !(rtc_ctrl & WM8350_RTC_ALMSTS));
202
203	if (!(rtc_ctrl & WM8350_RTC_ALMSTS))
204	return -ETIMEDOUT;
205
206	return 0;
207	}
208
209	static int wm8350_rtc_start_alarm(struct wm8350 *wm8350)
210	{
211	int ret;
212	int retries = WM8350_SET_ALM_RETRIES;
213	u16 rtc_ctrl;
214
215	ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
216	WM8350_RTC_ALMSET);
217	if (ret < 0)
218	return ret;
219
220	/* Wait until confirmation */
221	do {
222	rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
223	schedule_timeout_uninterruptible(msecs_to_jiffies(1));
224	} while (retries-- && rtc_ctrl & WM8350_RTC_ALMSTS);
225
226	if (rtc_ctrl & WM8350_RTC_ALMSTS)
227	return -ETIMEDOUT;
228
229	return 0;
230	}
231
47367a3b MB	232	static int wm8350_rtc_alarm_irq_enable(struct device *dev,
	233	unsigned int enabled)
	234	{
	235	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	236
	237	if (enabled)
	238	return wm8350_rtc_start_alarm(wm8350);
	239	else
	240	return wm8350_rtc_stop_alarm(wm8350);
	241	}
	242
077eaf5b MB	243	static int wm8350_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	244	{
	245	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	246	struct rtc_time *tm = &alrm->time;
	247	u16 time[3];
	248	int ret;
	249
	250	memset(time, 0, sizeof(time));
	251
	252	if (tm->tm_sec != -1)
	253	time[0] \|= tm->tm_sec;
	254	else
	255	time[0] \|= WM8350_RTC_ALMSECS_MASK;
	256
	257	if (tm->tm_min != -1)
	258	time[0] \|= tm->tm_min << WM8350_RTC_ALMMINS_SHIFT;
	259	else
	260	time[0] \|= WM8350_RTC_ALMMINS_MASK;
	261
	262	if (tm->tm_hour != -1)
	263	time[1] \|= tm->tm_hour;
	264	else
	265	time[1] \|= WM8350_RTC_ALMHRS_MASK;
	266
	267	if (tm->tm_wday != -1)
	268	time[1] \|= (tm->tm_wday + 1) << WM8350_RTC_ALMDAY_SHIFT;
	269	else
	270	time[1] \|= WM8350_RTC_ALMDAY_MASK;
	271
	272	if (tm->tm_mday != -1)
	273	time[2] \|= tm->tm_mday;
	274	else
	275	time[2] \|= WM8350_RTC_ALMDATE_MASK;
	276
	277	if (tm->tm_mon != -1)
	278	time[2] \|= (tm->tm_mon + 1) << WM8350_RTC_ALMMTH_SHIFT;
	279	else
	280	time[2] \|= WM8350_RTC_ALMMTH_MASK;
	281
	282	ret = wm8350_rtc_stop_alarm(wm8350);
	283	if (ret < 0)
	284	return ret;
	285
	286	/* Write time to RTC */
	287	ret = wm8350_block_write(wm8350, WM8350_ALARM_SECONDS_MINUTES,
	288	3, time);
	289	if (ret < 0)
	290	return ret;
	291
	292	if (alrm->enabled)
	293	ret = wm8350_rtc_start_alarm(wm8350);
	294
	295	return ret;
	296	}
	297
5a65edbc	298	static irqreturn_t wm8350_rtc_alarm_handler(int irq, void *data)
077eaf5b	299	{
5a65edbc	300	struct wm8350 *wm8350 = data;
077eaf5b MB	301	struct rtc_device *rtc = wm8350->rtc.rtc;
	302	int ret;
	303
	304	rtc_update_irq(rtc, 1, RTC_IRQF \| RTC_AF);
	305
	306	/* Make it one shot */
	307	ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL,
	308	WM8350_RTC_ALMSET);
	309	if (ret != 0) {
	310	dev_err(&(wm8350->rtc.pdev->dev),
	311	"Failed to disable alarm: %d\n", ret);
	312	}
5a65edbc MB	313
5a65edbc MB	314	return IRQ_HANDLED;
077eaf5b MB	315	}
077eaf5b MB	316
5a65edbc	317	static irqreturn_t wm8350_rtc_update_handler(int irq, void *data)
077eaf5b	318	{
5a65edbc	319	struct wm8350 *wm8350 = data;
077eaf5b MB	320	struct rtc_device *rtc = wm8350->rtc.rtc;
	321
	322	rtc_update_irq(rtc, 1, RTC_IRQF \| RTC_UF);
5a65edbc MB	323
5a65edbc MB	324	return IRQ_HANDLED;
077eaf5b MB	325	}
	326
	327	static const struct rtc_class_ops wm8350_rtc_ops = {
077eaf5b MB	328	.read_time = wm8350_rtc_readtime,
	329	.set_time = wm8350_rtc_settime,
	330	.read_alarm = wm8350_rtc_readalarm,
	331	.set_alarm = wm8350_rtc_setalarm,
47367a3b	332	.alarm_irq_enable = wm8350_rtc_alarm_irq_enable,
077eaf5b MB	333	};
077eaf5b MB	334
7d17158c	335	#ifdef CONFIG_PM_SLEEP
6f38b043	336	static int wm8350_rtc_suspend(struct device *dev)
077eaf5b	337	{
527bd754	338	struct wm8350 *wm8350 = dev_get_drvdata(dev);
077eaf5b MB	339	int ret = 0;
	340	u16 reg;
	341
	342	reg = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
	343
	344	if (device_may_wakeup(&wm8350->rtc.pdev->dev) &&
	345	reg & WM8350_RTC_ALMSTS) {
	346	ret = wm8350_rtc_stop_alarm(wm8350);
	347	if (ret != 0)
527bd754	348	dev_err(dev, "Failed to stop RTC alarm: %d\n", ret);
077eaf5b MB	349	}
	350
	351	return ret;
	352	}
	353
6f38b043	354	static int wm8350_rtc_resume(struct device *dev)
077eaf5b	355	{
527bd754	356	struct wm8350 *wm8350 = dev_get_drvdata(dev);
077eaf5b MB	357	int ret;
	358
	359	if (wm8350->rtc.alarm_enabled) {
	360	ret = wm8350_rtc_start_alarm(wm8350);
	361	if (ret != 0)
527bd754	362	dev_err(dev, "Failed to restart RTC alarm: %d\n", ret);
077eaf5b MB	363	}
	364
	365	return 0;
	366	}
077eaf5b MB	367	#endif
	368
	369	static int wm8350_rtc_probe(struct platform_device *pdev)
	370	{
	371	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
	372	struct wm8350_rtc *wm_rtc = &wm8350->rtc;
	373	int ret = 0;
	374	u16 timectl, power5;
	375
	376	timectl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
	377	if (timectl & WM8350_RTC_BCD) {
	378	dev_err(&pdev->dev, "RTC BCD mode not supported\n");
	379	return -EINVAL;
	380	}
	381	if (timectl & WM8350_RTC_12HR) {
	382	dev_err(&pdev->dev, "RTC 12 hour mode not supported\n");
	383	return -EINVAL;
	384	}
	385
	386	/* enable the RTC if it's not already enabled */
	387	power5 = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
	388	if (!(power5 & WM8350_RTC_TICK_ENA)) {
	389	dev_info(wm8350->dev, "Starting RTC\n");
	390
	391	wm8350_reg_unlock(wm8350);
	392
	393	ret = wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5,
	394	WM8350_RTC_TICK_ENA);
	395	if (ret < 0) {
	396	dev_err(&pdev->dev, "failed to enable RTC: %d\n", ret);
	397	return ret;
	398	}
	399
	400	wm8350_reg_lock(wm8350);
	401	}
	402
	403	if (timectl & WM8350_RTC_STS) {
	404	int retries;
	405
	406	ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
	407	WM8350_RTC_SET);
	408	if (ret < 0) {
	409	dev_err(&pdev->dev, "failed to start: %d\n", ret);
	410	return ret;
	411	}
	412
	413	retries = WM8350_SET_TIME_RETRIES;
	414	do {
	415	timectl = wm8350_reg_read(wm8350,
	416	WM8350_RTC_TIME_CONTROL);
62da659a	417	} while (timectl & WM8350_RTC_STS && --retries);
077eaf5b MB	418
	419	if (retries == 0) {
	420	dev_err(&pdev->dev, "failed to start: timeout\n");
	421	return -ENODEV;
	422	}
	423	}
	424
	425	device_init_wakeup(&pdev->dev, 1);
	426
a5aa7776 JH	427	wm_rtc->rtc = devm_rtc_device_register(&pdev->dev, "wm8350",
a5aa7776 JH	428	&wm8350_rtc_ops, THIS_MODULE);
077eaf5b MB	429	if (IS_ERR(wm_rtc->rtc)) {
	430	ret = PTR_ERR(wm_rtc->rtc);
	431	dev_err(&pdev->dev, "failed to register RTC: %d\n", ret);
	432	return ret;
	433	}
	434
43f0269b	435	ret = wm8350_register_irq(wm8350, WM8350_IRQ_RTC_SEC,
5a65edbc MB	436	wm8350_rtc_update_handler, 0,
5a65edbc MB	437	"RTC Seconds", wm8350);
43f0269b JJ	438	if (ret)
	439	return ret;
	440
6a612746	441	wm8350_mask_irq(wm8350, WM8350_IRQ_RTC_SEC);
077eaf5b	442
43f0269b	443	ret = wm8350_register_irq(wm8350, WM8350_IRQ_RTC_ALM,
5a65edbc MB	444	wm8350_rtc_alarm_handler, 0,
5a65edbc MB	445	"RTC Alarm", wm8350);
43f0269b JJ	446	if (ret) {
	447	wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
	448	return ret;
	449	}
077eaf5b MB	450
	451	return 0;
	452	}
	453
5a167f45	454	static int wm8350_rtc_remove(struct platform_device *pdev)
077eaf5b MB	455	{
077eaf5b MB	456	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
077eaf5b	457
f99344fc MB	458	wm8350_free_irq(wm8350, WM8350_IRQ_RTC_SEC, wm8350);
f99344fc MB	459	wm8350_free_irq(wm8350, WM8350_IRQ_RTC_ALM, wm8350);
077eaf5b	460
077eaf5b MB	461	return 0;
	462	}
	463
7d17158c JH	464	static SIMPLE_DEV_PM_OPS(wm8350_rtc_pm_ops, wm8350_rtc_suspend,
7d17158c JH	465	wm8350_rtc_resume);
6f38b043	466
077eaf5b MB	467	static struct platform_driver wm8350_rtc_driver = {
077eaf5b MB	468	.probe = wm8350_rtc_probe,
5a167f45	469	.remove = wm8350_rtc_remove,
077eaf5b MB	470	.driver = {
077eaf5b MB	471	.name = "wm8350-rtc",
6f38b043	472	.pm = &wm8350_rtc_pm_ops,
077eaf5b MB	473	},
	474	};
	475
0c4eae66	476	module_platform_driver(wm8350_rtc_driver);
077eaf5b MB	477
	478	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	479	MODULE_DESCRIPTION("RTC driver for the WM8350");
	480	MODULE_LICENSE("GPL");
	481	MODULE_ALIAS("platform:wm8350-rtc");