[deliverable/linux.git] / drivers / rtc / rtc-ds1286.c

/*
 * DS1286 Real Time Clock interface for Linux
 *
 * Copyright (C) 1998, 1999, 2000 Ralf Baechle
 * Copyright (C) 2008 Thomas Bogendoerfer
 *
 * Based on code written by Paul Gortmaker.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/bcd.h>
#include <linux/ds1286.h>
#include <linux/io.h>
#include <linux/slab.h>

#define DRV_VERSION		"1.0"

struct ds1286_priv {
	struct rtc_device *rtc;
	u32 __iomem *rtcregs;
	spinlock_t lock;
};

static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)
{
	return __raw_readl(&priv->rtcregs[reg]) & 0xff;
}

static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)
{
	__raw_writel(data, &priv->rtcregs[reg]);
}


static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct ds1286_priv *priv = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned char val;

	/* Allow or mask alarm interrupts */
	spin_lock_irqsave(&priv->lock, flags);
	val = ds1286_rtc_read(priv, RTC_CMD);
	if (enabled)
		val &=  ~RTC_TDM;
	else
		val |=  RTC_TDM;
	ds1286_rtc_write(priv, val, RTC_CMD);
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

#ifdef CONFIG_RTC_INTF_DEV

static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	struct ds1286_priv *priv = dev_get_drvdata(dev);
	unsigned long flags;
	unsigned char val;

	switch (cmd) {
	case RTC_WIE_OFF:
		/* Mask watchdog int. enab. bit	*/
		spin_lock_irqsave(&priv->lock, flags);
		val = ds1286_rtc_read(priv, RTC_CMD);
		val |= RTC_WAM;
		ds1286_rtc_write(priv, val, RTC_CMD);
		spin_unlock_irqrestore(&priv->lock, flags);
		break;
	case RTC_WIE_ON:
		/* Allow watchdog interrupts.	*/
		spin_lock_irqsave(&priv->lock, flags);
		val = ds1286_rtc_read(priv, RTC_CMD);
		val &= ~RTC_WAM;
		ds1286_rtc_write(priv, val, RTC_CMD);
		spin_unlock_irqrestore(&priv->lock, flags);
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return 0;
}

#else
#define ds1286_ioctl    NULL
#endif

#ifdef CONFIG_PROC_FS

static int ds1286_proc(struct device *dev, struct seq_file *seq)
{
	struct ds1286_priv *priv = dev_get_drvdata(dev);
	unsigned char month, cmd, amode;
	const char *s;

	month = ds1286_rtc_read(priv, RTC_MONTH);
	seq_printf(seq,
		   "oscillator\t: %s\n"
		   "square_wave\t: %s\n",
		   (month & RTC_EOSC) ? "disabled" : "enabled",
		   (month & RTC_ESQW) ? "disabled" : "enabled");

	amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) |
		((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) |
		((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7);
	switch (amode) {
	case 7:
		s = "each minute";
		break;
	case 3:
		s = "minutes match";
		break;
	case 1:
		s = "hours and minutes match";
		break;
	case 0:
		s = "days, hours and minutes match";
		break;
	default:
		s = "invalid";
		break;
	}
	seq_printf(seq, "alarm_mode\t: %s\n", s);

	cmd = ds1286_rtc_read(priv, RTC_CMD);
	seq_printf(seq,
		   "alarm_enable\t: %s\n"
		   "wdog_alarm\t: %s\n"
		   "alarm_mask\t: %s\n"
		   "wdog_alarm_mask\t: %s\n"
		   "interrupt_mode\t: %s\n"
		   "INTB_mode\t: %s_active\n"
		   "interrupt_pins\t: %s\n",
		   (cmd & RTC_TDF) ? "yes" : "no",
		   (cmd & RTC_WAF) ? "yes" : "no",
		   (cmd & RTC_TDM) ? "disabled" : "enabled",
		   (cmd & RTC_WAM) ? "disabled" : "enabled",
		   (cmd & RTC_PU_LVL) ? "pulse" : "level",
		   (cmd & RTC_IBH_LO) ? "low" : "high",
		   (cmd & RTC_IPSW) ? "unswapped" : "swapped");
	return 0;
}

#else
#define ds1286_proc     NULL
#endif

static int ds1286_read_time(struct device *dev, struct rtc_time *tm)
{
	struct ds1286_priv *priv = dev_get_drvdata(dev);
	unsigned char save_control;
	unsigned long flags;
	unsigned long uip_watchdog = jiffies;

	/*
	 * read RTC once any update in progress is done. The update
	 * can take just over 2ms. We wait 10 to 20ms. There is no need to
	 * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
	 * If you need to know *exactly* when a second has started, enable
	 * periodic update complete interrupts, (via ioctl) and then
	 * immediately read /dev/rtc which will block until you get the IRQ.
	 * Once the read clears, read the RTC time (again via ioctl). Easy.
	 */

	if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE)
		while (time_before(jiffies, uip_watchdog + 2*HZ/100))
			barrier();

	/*
	 * Only the values that we read from the RTC are set. We leave
	 * tm_wday, tm_yday and tm_isdst untouched. Even though the
	 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
	 * by the RTC when initially set to a non-zero value.
	 */
	spin_lock_irqsave(&priv->lock, flags);
	save_control = ds1286_rtc_read(priv, RTC_CMD);
	ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);

	tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS);
	tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES);
	tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f;
	tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE);
	tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f;
	tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR);

	ds1286_rtc_write(priv, save_control, RTC_CMD);
	spin_unlock_irqrestore(&priv->lock, flags);

	tm->tm_sec = bcd2bin(tm->tm_sec);
	tm->tm_min = bcd2bin(tm->tm_min);
	tm->tm_hour = bcd2bin(tm->tm_hour);
	tm->tm_mday = bcd2bin(tm->tm_mday);
	tm->tm_mon = bcd2bin(tm->tm_mon);
	tm->tm_year = bcd2bin(tm->tm_year);

	/*
	 * Account for differences between how the RTC uses the values
	 * and how they are defined in a struct rtc_time;
	 */
	if (tm->tm_year < 45)
		tm->tm_year += 30;
	tm->tm_year += 40;
	if (tm->tm_year < 70)
		tm->tm_year += 100;

	tm->tm_mon--;

	return rtc_valid_tm(tm);
}

static int ds1286_set_time(struct device *dev, struct rtc_time *tm)
{
	struct ds1286_priv *priv = dev_get_drvdata(dev);
	unsigned char mon, day, hrs, min, sec;
	unsigned char save_control;
	unsigned int yrs;
	unsigned long flags;

	yrs = tm->tm_year + 1900;
	mon = tm->tm_mon + 1;   /* tm_mon starts at zero */
	day = tm->tm_mday;
	hrs = tm->tm_hour;
	min = tm->tm_min;
	sec = tm->tm_sec;

	if (yrs < 1970)
		return -EINVAL;

	yrs -= 1940;
	if (yrs > 255)    /* They are unsigned */
		return -EINVAL;

	if (yrs >= 100)
		yrs -= 100;

	sec = bin2bcd(sec);
	min = bin2bcd(min);
	hrs = bin2bcd(hrs);
	day = bin2bcd(day);
	mon = bin2bcd(mon);
	yrs = bin2bcd(yrs);

	spin_lock_irqsave(&priv->lock, flags);
	save_control = ds1286_rtc_read(priv, RTC_CMD);
	ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);

	ds1286_rtc_write(priv, yrs, RTC_YEAR);
	ds1286_rtc_write(priv, mon, RTC_MONTH);
	ds1286_rtc_write(priv, day, RTC_DATE);
	ds1286_rtc_write(priv, hrs, RTC_HOURS);
	ds1286_rtc_write(priv, min, RTC_MINUTES);
	ds1286_rtc_write(priv, sec, RTC_SECONDS);
	ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND);

	ds1286_rtc_write(priv, save_control, RTC_CMD);
	spin_unlock_irqrestore(&priv->lock, flags);
	return 0;
}

static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct ds1286_priv *priv = dev_get_drvdata(dev);
	unsigned long flags;

	/*
	 * Only the values that we read from the RTC are set. That
	 * means only tm_wday, tm_hour, tm_min.
	 */
	spin_lock_irqsave(&priv->lock, flags);
	alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f;
	alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM)  & 0x1f;
	alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM)    & 0x07;
	ds1286_rtc_read(priv, RTC_CMD);
	spin_unlock_irqrestore(&priv->lock, flags);

	alm->time.tm_min = bcd2bin(alm->time.tm_min);
	alm->time.tm_hour = bcd2bin(alm->time.tm_hour);
	alm->time.tm_sec = 0;
	return 0;
}

static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct ds1286_priv *priv = dev_get_drvdata(dev);
	unsigned char hrs, min, sec;

	hrs = alm->time.tm_hour;
	min = alm->time.tm_min;
	sec = alm->time.tm_sec;

	if (hrs >= 24)
		hrs = 0xff;

	if (min >= 60)
		min = 0xff;

	if (sec != 0)
		return -EINVAL;

	min = bin2bcd(min);
	hrs = bin2bcd(hrs);

	spin_lock(&priv->lock);
	ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM);
	ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM);
	spin_unlock(&priv->lock);

	return 0;
}

static const struct rtc_class_ops ds1286_ops = {
	.ioctl		= ds1286_ioctl,
	.proc		= ds1286_proc,
	.read_time	= ds1286_read_time,
	.set_time	= ds1286_set_time,
	.read_alarm	= ds1286_read_alarm,
	.set_alarm	= ds1286_set_alarm,
	.alarm_irq_enable = ds1286_alarm_irq_enable,
};

static int ds1286_probe(struct platform_device *pdev)
{
	struct rtc_device *rtc;
	struct resource *res;
	struct ds1286_priv *priv;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;
	priv = devm_kzalloc(&pdev->dev, sizeof(struct ds1286_priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->rtcregs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->rtcregs))
		return PTR_ERR(priv->rtcregs);

	spin_lock_init(&priv->lock);
	platform_set_drvdata(pdev, priv);
	rtc = devm_rtc_device_register(&pdev->dev, "ds1286", &ds1286_ops,
					THIS_MODULE);
	if (IS_ERR(rtc))
		return PTR_ERR(rtc);
	priv->rtc = rtc;
	return 0;
}

static struct platform_driver ds1286_platform_driver = {
	.driver		= {
		.name	= "rtc-ds1286",
	},
	.probe		= ds1286_probe,
};

module_platform_driver(ds1286_platform_driver);

MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
MODULE_DESCRIPTION("DS1286 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_ALIAS("platform:rtc-ds1286");
Commit	Line	Data
5f119f29 TB	1	/*
	2	* DS1286 Real Time Clock interface for Linux
	3	*
	4	* Copyright (C) 1998, 1999, 2000 Ralf Baechle
	5	* Copyright (C) 2008 Thomas Bogendoerfer
	6	*
	7	* Based on code written by Paul Gortmaker.
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/rtc.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/bcd.h>
	19	#include <linux/ds1286.h>
d7a6119f	20	#include <linux/io.h>
5a0e3ad6	21	#include <linux/slab.h>
5f119f29 TB	22
	23	#define DRV_VERSION "1.0"
	24
	25	struct ds1286_priv {
	26	struct rtc_device *rtc;
	27	u32 __iomem *rtcregs;
5f119f29 TB	28	spinlock_t lock;
	29	};
	30
	31	static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)
	32	{
	33	return __raw_readl(&priv->rtcregs[reg]) & 0xff;
	34	}
	35
	36	static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)
	37	{
	38	__raw_writel(data, &priv->rtcregs[reg]);
	39	}
	40
16380c15 JS	41
	42	static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled)
	43	{
	44	struct ds1286_priv *priv = dev_get_drvdata(dev);
	45	unsigned long flags;
	46	unsigned char val;
	47
	48	/* Allow or mask alarm interrupts */
	49	spin_lock_irqsave(&priv->lock, flags);
	50	val = ds1286_rtc_read(priv, RTC_CMD);
	51	if (enabled)
	52	val &= ~RTC_TDM;
	53	else
	54	val \|= RTC_TDM;
	55	ds1286_rtc_write(priv, val, RTC_CMD);
	56	spin_unlock_irqrestore(&priv->lock, flags);
	57
	58	return 0;
	59	}
	60
5f119f29 TB	61	#ifdef CONFIG_RTC_INTF_DEV
	62
	63	static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	64	{
	65	struct ds1286_priv *priv = dev_get_drvdata(dev);
	66	unsigned long flags;
	67	unsigned char val;
	68
	69	switch (cmd) {
5f119f29 TB	70	case RTC_WIE_OFF:
	71	/* Mask watchdog int. enab. bit */
	72	spin_lock_irqsave(&priv->lock, flags);
	73	val = ds1286_rtc_read(priv, RTC_CMD);
	74	val \|= RTC_WAM;
	75	ds1286_rtc_write(priv, val, RTC_CMD);
	76	spin_unlock_irqrestore(&priv->lock, flags);
	77	break;
	78	case RTC_WIE_ON:
	79	/* Allow watchdog interrupts. */
	80	spin_lock_irqsave(&priv->lock, flags);
	81	val = ds1286_rtc_read(priv, RTC_CMD);
	82	val &= ~RTC_WAM;
	83	ds1286_rtc_write(priv, val, RTC_CMD);
	84	spin_unlock_irqrestore(&priv->lock, flags);
	85	break;
	86	default:
	87	return -ENOIOCTLCMD;
	88	}
	89	return 0;
	90	}
	91
	92	#else
	93	#define ds1286_ioctl NULL
	94	#endif
	95
	96	#ifdef CONFIG_PROC_FS
	97
	98	static int ds1286_proc(struct device dev, struct seq_file seq)
	99	{
	100	struct ds1286_priv *priv = dev_get_drvdata(dev);
	101	unsigned char month, cmd, amode;
	102	const char *s;
	103
	104	month = ds1286_rtc_read(priv, RTC_MONTH);
	105	seq_printf(seq,
	106	"oscillator\t: %s\n"
	107	"square_wave\t: %s\n",
	108	(month & RTC_EOSC) ? "disabled" : "enabled",
	109	(month & RTC_ESQW) ? "disabled" : "enabled");
	110
	111	amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) \|
	112	((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) \|
	113	((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7);
	114	switch (amode) {
	115	case 7:
	116	s = "each minute";
	117	break;
	118	case 3:
	119	s = "minutes match";
	120	break;
	121	case 1:
	122	s = "hours and minutes match";
	123	break;
	124	case 0:
	125	s = "days, hours and minutes match";
	126	break;
	127	default:
	128	s = "invalid";
	129	break;
	130	}
	131	seq_printf(seq, "alarm_mode\t: %s\n", s);
	132
	133	cmd = ds1286_rtc_read(priv, RTC_CMD);
134	seq_printf(seq,
135	"alarm_enable\t: %s\n"
136	"wdog_alarm\t: %s\n"
137	"alarm_mask\t: %s\n"
138	"wdog_alarm_mask\t: %s\n"
139	"interrupt_mode\t: %s\n"
140	"INTB_mode\t: %s_active\n"
141	"interrupt_pins\t: %s\n",
142	(cmd & RTC_TDF) ? "yes" : "no",
143	(cmd & RTC_WAF) ? "yes" : "no",
144	(cmd & RTC_TDM) ? "disabled" : "enabled",
145	(cmd & RTC_WAM) ? "disabled" : "enabled",
146	(cmd & RTC_PU_LVL) ? "pulse" : "level",
147	(cmd & RTC_IBH_LO) ? "low" : "high",
148	(cmd & RTC_IPSW) ? "unswapped" : "swapped");
149	return 0;
150	}
151
152	#else
153	#define ds1286_proc NULL
154	#endif
155
156	static int ds1286_read_time(struct device dev, struct rtc_time tm)
157	{
158	struct ds1286_priv *priv = dev_get_drvdata(dev);
159	unsigned char save_control;
160	unsigned long flags;
161	unsigned long uip_watchdog = jiffies;
162
163	/*
164	* read RTC once any update in progress is done. The update
165	* can take just over 2ms. We wait 10 to 20ms. There is no need to
166	* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
167	* If you need to know exactly when a second has started, enable
168	* periodic update complete interrupts, (via ioctl) and then
169	* immediately read /dev/rtc which will block until you get the IRQ.
170	* Once the read clears, read the RTC time (again via ioctl). Easy.
171	*/
172
173	if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE)
174	while (time_before(jiffies, uip_watchdog + 2*HZ/100))
175	barrier();
176
177	/*
178	* Only the values that we read from the RTC are set. We leave
179	* tm_wday, tm_yday and tm_isdst untouched. Even though the
180	* RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
181	* by the RTC when initially set to a non-zero value.
182	*/
183	spin_lock_irqsave(&priv->lock, flags);
184	save_control = ds1286_rtc_read(priv, RTC_CMD);
185	ds1286_rtc_write(priv, (save_control\|RTC_TE), RTC_CMD);
186
187	tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS);
188	tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES);
189	tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f;
190	tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE);
191	tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f;
192	tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR);
193
194	ds1286_rtc_write(priv, save_control, RTC_CMD);
195	spin_unlock_irqrestore(&priv->lock, flags);
196
197	tm->tm_sec = bcd2bin(tm->tm_sec);
198	tm->tm_min = bcd2bin(tm->tm_min);
199	tm->tm_hour = bcd2bin(tm->tm_hour);
200	tm->tm_mday = bcd2bin(tm->tm_mday);
201	tm->tm_mon = bcd2bin(tm->tm_mon);
202	tm->tm_year = bcd2bin(tm->tm_year);
203
204	/*
205	* Account for differences between how the RTC uses the values
206	* and how they are defined in a struct rtc_time;
207	*/
208	if (tm->tm_year < 45)
209	tm->tm_year += 30;
210	tm->tm_year += 40;
211	if (tm->tm_year < 70)
212	tm->tm_year += 100;
213
214	tm->tm_mon--;
215
216	return rtc_valid_tm(tm);
217	}
218
219	static int ds1286_set_time(struct device dev, struct rtc_time tm)
220	{
221	struct ds1286_priv *priv = dev_get_drvdata(dev);
222	unsigned char mon, day, hrs, min, sec;
223	unsigned char save_control;
224	unsigned int yrs;
225	unsigned long flags;
226
227	yrs = tm->tm_year + 1900;
228	mon = tm->tm_mon + 1; /* tm_mon starts at zero */
229	day = tm->tm_mday;
230	hrs = tm->tm_hour;
231	min = tm->tm_min;
232	sec = tm->tm_sec;
233
234	if (yrs < 1970)
235	return -EINVAL;
236
237	yrs -= 1940;
238	if (yrs > 255) /* They are unsigned */
239	return -EINVAL;
240
241	if (yrs >= 100)
242	yrs -= 100;
243
244	sec = bin2bcd(sec);
245	min = bin2bcd(min);
246	hrs = bin2bcd(hrs);
247	day = bin2bcd(day);
248	mon = bin2bcd(mon);
249	yrs = bin2bcd(yrs);
250
251	spin_lock_irqsave(&priv->lock, flags);
252	save_control = ds1286_rtc_read(priv, RTC_CMD);
253	ds1286_rtc_write(priv, (save_control\|RTC_TE), RTC_CMD);
254
255	ds1286_rtc_write(priv, yrs, RTC_YEAR);
256	ds1286_rtc_write(priv, mon, RTC_MONTH);
257	ds1286_rtc_write(priv, day, RTC_DATE);
258	ds1286_rtc_write(priv, hrs, RTC_HOURS);
259	ds1286_rtc_write(priv, min, RTC_MINUTES);
260	ds1286_rtc_write(priv, sec, RTC_SECONDS);
261	ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND);
262
263	ds1286_rtc_write(priv, save_control, RTC_CMD);
264	spin_unlock_irqrestore(&priv->lock, flags);
265	return 0;
266	}
267
268	static int ds1286_read_alarm(struct device dev, struct rtc_wkalrm alm)
269	{
270	struct ds1286_priv *priv = dev_get_drvdata(dev);
5f119f29 TB	271	unsigned long flags;
	272
	273	/*
	274	* Only the values that we read from the RTC are set. That
	275	* means only tm_wday, tm_hour, tm_min.
	276	*/
	277	spin_lock_irqsave(&priv->lock, flags);
	278	alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f;
	279	alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f;
	280	alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07;
cb72f60c	281	ds1286_rtc_read(priv, RTC_CMD);
5f119f29 TB	282	spin_unlock_irqrestore(&priv->lock, flags);
	283
	284	alm->time.tm_min = bcd2bin(alm->time.tm_min);
	285	alm->time.tm_hour = bcd2bin(alm->time.tm_hour);
	286	alm->time.tm_sec = 0;
	287	return 0;
	288	}
	289
	290	static int ds1286_set_alarm(struct device dev, struct rtc_wkalrm alm)
	291	{
	292	struct ds1286_priv *priv = dev_get_drvdata(dev);
	293	unsigned char hrs, min, sec;
	294
	295	hrs = alm->time.tm_hour;
	296	min = alm->time.tm_min;
	297	sec = alm->time.tm_sec;
	298
	299	if (hrs >= 24)
	300	hrs = 0xff;
	301
	302	if (min >= 60)
	303	min = 0xff;
	304
	305	if (sec != 0)
	306	return -EINVAL;
	307
	308	min = bin2bcd(min);
	309	hrs = bin2bcd(hrs);
	310
	311	spin_lock(&priv->lock);
	312	ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM);
	313	ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM);
	314	spin_unlock(&priv->lock);
	315
	316	return 0;
	317	}
	318
	319	static const struct rtc_class_ops ds1286_ops = {
16380c15 JS	320	.ioctl = ds1286_ioctl,
16380c15 JS	321	.proc = ds1286_proc,
5f119f29 TB	322	.read_time = ds1286_read_time,
	323	.set_time = ds1286_set_time,
	324	.read_alarm = ds1286_read_alarm,
	325	.set_alarm = ds1286_set_alarm,
16380c15	326	.alarm_irq_enable = ds1286_alarm_irq_enable,
5f119f29 TB	327	};
5f119f29 TB	328
5a167f45	329	static int ds1286_probe(struct platform_device *pdev)
5f119f29 TB	330	{
	331	struct rtc_device *rtc;
	332	struct resource *res;
	333	struct ds1286_priv *priv;
5f119f29 TB	334
	335	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	336	if (!res)
	337	return -ENODEV;
061d698e	338	priv = devm_kzalloc(&pdev->dev, sizeof(struct ds1286_priv), GFP_KERNEL);
5f119f29 TB	339	if (!priv)
	340	return -ENOMEM;
	341
061d698e JH	342	priv->rtcregs = devm_ioremap_resource(&pdev->dev, res);
	343	if (IS_ERR(priv->rtcregs))
	344	return PTR_ERR(priv->rtcregs);
	345
5f119f29	346	spin_lock_init(&priv->lock);
9a281a67	347	platform_set_drvdata(pdev, priv);
061d698e JH	348	rtc = devm_rtc_device_register(&pdev->dev, "ds1286", &ds1286_ops,
	349	THIS_MODULE);
	350	if (IS_ERR(rtc))
	351	return PTR_ERR(rtc);
5f119f29	352	priv->rtc = rtc;
5f119f29	353	return 0;
5f119f29 TB	354	}
5f119f29 TB	355
5f119f29 TB	356	static struct platform_driver ds1286_platform_driver = {
	357	.driver = {
	358	.name = "rtc-ds1286",
5f119f29 TB	359	},
5f119f29 TB	360	.probe = ds1286_probe,
5f119f29 TB	361	};
5f119f29 TB	362
0c4eae66	363	module_platform_driver(ds1286_platform_driver);
5f119f29 TB	364
	365	MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
	366	MODULE_DESCRIPTION("DS1286 RTC driver");
	367	MODULE_LICENSE("GPL");
	368	MODULE_VERSION(DRV_VERSION);
	369	MODULE_ALIAS("platform:rtc-ds1286");