[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;
	size_t size;
	unsigned long baseaddr;
	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 char cmd;
	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;
	cmd = 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 __devinit ds1286_probe(struct platform_device *pdev)
{
	struct rtc_device *rtc;
	struct resource *res;
	struct ds1286_priv *priv;
	int ret = 0;

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

	priv->size = resource_size(res);
	if (!request_mem_region(res->start, priv->size, pdev->name)) {
		ret = -EBUSY;
		goto out;
	}
	priv->baseaddr = res->start;
	priv->rtcregs = ioremap(priv->baseaddr, priv->size);
	if (!priv->rtcregs) {
		ret = -ENOMEM;
		goto out;
	}
	spin_lock_init(&priv->lock);
	platform_set_drvdata(pdev, priv);
	rtc = rtc_device_register("ds1286", &pdev->dev,
				  &ds1286_ops, THIS_MODULE);
	if (IS_ERR(rtc)) {
		ret = PTR_ERR(rtc);
		goto out;
	}
	priv->rtc = rtc;
	return 0;

out:
	if (priv->rtc)
		rtc_device_unregister(priv->rtc);
	if (priv->rtcregs)
		iounmap(priv->rtcregs);
	if (priv->baseaddr)
		release_mem_region(priv->baseaddr, priv->size);
	kfree(priv);
	return ret;
}

static int __devexit ds1286_remove(struct platform_device *pdev)
{
	struct ds1286_priv *priv = platform_get_drvdata(pdev);

	rtc_device_unregister(priv->rtc);
	iounmap(priv->rtcregs);
	release_mem_region(priv->baseaddr, priv->size);
	kfree(priv);
	return 0;
}

static struct platform_driver ds1286_platform_driver = {
	.driver		= {
		.name	= "rtc-ds1286",
		.owner	= THIS_MODULE,
	},
	.probe		= ds1286_probe,
	.remove		= __devexit_p(ds1286_remove),
};

module_platform_driver(ds1286_platform_driver);

MODULE_AUTHOR("Thomas Bogendoerfer <[email protected]>");
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;
	28	size_t size;
	29	unsigned long baseaddr;
	30	spinlock_t lock;
	31	};
	32
	33	static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)
	34	{
	35	return __raw_readl(&priv->rtcregs[reg]) & 0xff;
	36	}
	37
	38	static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)
	39	{
	40	__raw_writel(data, &priv->rtcregs[reg]);
	41	}
	42
16380c15 JS	43
	44	static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled)
	45	{
	46	struct ds1286_priv *priv = dev_get_drvdata(dev);
	47	unsigned long flags;
	48	unsigned char val;
	49
	50	/* Allow or mask alarm interrupts */
	51	spin_lock_irqsave(&priv->lock, flags);
	52	val = ds1286_rtc_read(priv, RTC_CMD);
	53	if (enabled)
	54	val &= ~RTC_TDM;
	55	else
	56	val \|= RTC_TDM;
	57	ds1286_rtc_write(priv, val, RTC_CMD);
	58	spin_unlock_irqrestore(&priv->lock, flags);
	59
	60	return 0;
	61	}
	62
5f119f29 TB	63	#ifdef CONFIG_RTC_INTF_DEV
	64
	65	static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	66	{
	67	struct ds1286_priv *priv = dev_get_drvdata(dev);
	68	unsigned long flags;
	69	unsigned char val;
	70
	71	switch (cmd) {
5f119f29 TB	72	case RTC_WIE_OFF:
	73	/* Mask watchdog int. enab. bit */
	74	spin_lock_irqsave(&priv->lock, flags);
	75	val = ds1286_rtc_read(priv, RTC_CMD);
	76	val \|= RTC_WAM;
	77	ds1286_rtc_write(priv, val, RTC_CMD);
	78	spin_unlock_irqrestore(&priv->lock, flags);
	79	break;
	80	case RTC_WIE_ON:
	81	/* Allow watchdog interrupts. */
	82	spin_lock_irqsave(&priv->lock, flags);
	83	val = ds1286_rtc_read(priv, RTC_CMD);
	84	val &= ~RTC_WAM;
	85	ds1286_rtc_write(priv, val, RTC_CMD);
	86	spin_unlock_irqrestore(&priv->lock, flags);
	87	break;
	88	default:
	89	return -ENOIOCTLCMD;
	90	}
	91	return 0;
	92	}
	93
	94	#else
	95	#define ds1286_ioctl NULL
	96	#endif
	97
	98	#ifdef CONFIG_PROC_FS
	99
	100	static int ds1286_proc(struct device dev, struct seq_file seq)
	101	{
	102	struct ds1286_priv *priv = dev_get_drvdata(dev);
	103	unsigned char month, cmd, amode;
	104	const char *s;
	105
	106	month = ds1286_rtc_read(priv, RTC_MONTH);
	107	seq_printf(seq,
	108	"oscillator\t: %s\n"
	109	"square_wave\t: %s\n",
	110	(month & RTC_EOSC) ? "disabled" : "enabled",
	111	(month & RTC_ESQW) ? "disabled" : "enabled");
	112
	113	amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) \|
	114	((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) \|
	115	((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7);
	116	switch (amode) {
	117	case 7:
	118	s = "each minute";
	119	break;
	120	case 3:
	121	s = "minutes match";
	122	break;
	123	case 1:
	124	s = "hours and minutes match";
	125	break;
	126	case 0:
	127	s = "days, hours and minutes match";
	128	break;
	129	default:
	130	s = "invalid";
	131	break;
	132	}
	133	seq_printf(seq, "alarm_mode\t: %s\n", s);
	134
	135	cmd = ds1286_rtc_read(priv, RTC_CMD);
136	seq_printf(seq,
137	"alarm_enable\t: %s\n"
138	"wdog_alarm\t: %s\n"
139	"alarm_mask\t: %s\n"
140	"wdog_alarm_mask\t: %s\n"
141	"interrupt_mode\t: %s\n"
142	"INTB_mode\t: %s_active\n"
143	"interrupt_pins\t: %s\n",
144	(cmd & RTC_TDF) ? "yes" : "no",
145	(cmd & RTC_WAF) ? "yes" : "no",
146	(cmd & RTC_TDM) ? "disabled" : "enabled",
147	(cmd & RTC_WAM) ? "disabled" : "enabled",
148	(cmd & RTC_PU_LVL) ? "pulse" : "level",
149	(cmd & RTC_IBH_LO) ? "low" : "high",
150	(cmd & RTC_IPSW) ? "unswapped" : "swapped");
151	return 0;
152	}
153
154	#else
155	#define ds1286_proc NULL
156	#endif
157
158	static int ds1286_read_time(struct device dev, struct rtc_time tm)
159	{
160	struct ds1286_priv *priv = dev_get_drvdata(dev);
161	unsigned char save_control;
162	unsigned long flags;
163	unsigned long uip_watchdog = jiffies;
164
165	/*
166	* read RTC once any update in progress is done. The update
167	* can take just over 2ms. We wait 10 to 20ms. There is no need to
168	* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
169	* If you need to know exactly when a second has started, enable
170	* periodic update complete interrupts, (via ioctl) and then
171	* immediately read /dev/rtc which will block until you get the IRQ.
172	* Once the read clears, read the RTC time (again via ioctl). Easy.
173	*/
174
175	if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE)
176	while (time_before(jiffies, uip_watchdog + 2*HZ/100))
177	barrier();
178
179	/*
180	* Only the values that we read from the RTC are set. We leave
181	* tm_wday, tm_yday and tm_isdst untouched. Even though the
182	* RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
183	* by the RTC when initially set to a non-zero value.
184	*/
185	spin_lock_irqsave(&priv->lock, flags);
186	save_control = ds1286_rtc_read(priv, RTC_CMD);
187	ds1286_rtc_write(priv, (save_control\|RTC_TE), RTC_CMD);
188
189	tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS);
190	tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES);
191	tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f;
192	tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE);
193	tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f;
194	tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR);
195
196	ds1286_rtc_write(priv, save_control, RTC_CMD);
197	spin_unlock_irqrestore(&priv->lock, flags);
198
199	tm->tm_sec = bcd2bin(tm->tm_sec);
200	tm->tm_min = bcd2bin(tm->tm_min);
201	tm->tm_hour = bcd2bin(tm->tm_hour);
202	tm->tm_mday = bcd2bin(tm->tm_mday);
203	tm->tm_mon = bcd2bin(tm->tm_mon);
204	tm->tm_year = bcd2bin(tm->tm_year);
205
206	/*
207	* Account for differences between how the RTC uses the values
208	* and how they are defined in a struct rtc_time;
209	*/
210	if (tm->tm_year < 45)
211	tm->tm_year += 30;
212	tm->tm_year += 40;
213	if (tm->tm_year < 70)
214	tm->tm_year += 100;
215
216	tm->tm_mon--;
217
218	return rtc_valid_tm(tm);
219	}
220
221	static int ds1286_set_time(struct device dev, struct rtc_time tm)
222	{
223	struct ds1286_priv *priv = dev_get_drvdata(dev);
224	unsigned char mon, day, hrs, min, sec;
225	unsigned char save_control;
226	unsigned int yrs;
227	unsigned long flags;
228
229	yrs = tm->tm_year + 1900;
230	mon = tm->tm_mon + 1; /* tm_mon starts at zero */
231	day = tm->tm_mday;
232	hrs = tm->tm_hour;
233	min = tm->tm_min;
234	sec = tm->tm_sec;
235
236	if (yrs < 1970)
237	return -EINVAL;
238
239	yrs -= 1940;
240	if (yrs > 255) /* They are unsigned */
241	return -EINVAL;
242
243	if (yrs >= 100)
244	yrs -= 100;
245
246	sec = bin2bcd(sec);
247	min = bin2bcd(min);
248	hrs = bin2bcd(hrs);
249	day = bin2bcd(day);
250	mon = bin2bcd(mon);
251	yrs = bin2bcd(yrs);
252
253	spin_lock_irqsave(&priv->lock, flags);
254	save_control = ds1286_rtc_read(priv, RTC_CMD);
255	ds1286_rtc_write(priv, (save_control\|RTC_TE), RTC_CMD);
256
257	ds1286_rtc_write(priv, yrs, RTC_YEAR);
258	ds1286_rtc_write(priv, mon, RTC_MONTH);
259	ds1286_rtc_write(priv, day, RTC_DATE);
260	ds1286_rtc_write(priv, hrs, RTC_HOURS);
261	ds1286_rtc_write(priv, min, RTC_MINUTES);
262	ds1286_rtc_write(priv, sec, RTC_SECONDS);
263	ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND);
264
265	ds1286_rtc_write(priv, save_control, RTC_CMD);
266	spin_unlock_irqrestore(&priv->lock, flags);
267	return 0;
268	}
269
270	static int ds1286_read_alarm(struct device dev, struct rtc_wkalrm alm)
271	{
272	struct ds1286_priv *priv = dev_get_drvdata(dev);
273	unsigned char cmd;
274	unsigned long flags;
275
276	/*
277	* Only the values that we read from the RTC are set. That
278	* means only tm_wday, tm_hour, tm_min.
279	*/
280	spin_lock_irqsave(&priv->lock, flags);
281	alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f;
282	alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f;
283	alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07;
284	cmd = ds1286_rtc_read(priv, RTC_CMD);
285	spin_unlock_irqrestore(&priv->lock, flags);
286
287	alm->time.tm_min = bcd2bin(alm->time.tm_min);
288	alm->time.tm_hour = bcd2bin(alm->time.tm_hour);
289	alm->time.tm_sec = 0;
290	return 0;
291	}
292
293	static int ds1286_set_alarm(struct device dev, struct rtc_wkalrm alm)
294	{
295	struct ds1286_priv *priv = dev_get_drvdata(dev);
296	unsigned char hrs, min, sec;
297
298	hrs = alm->time.tm_hour;
299	min = alm->time.tm_min;
300	sec = alm->time.tm_sec;
301
302	if (hrs >= 24)
303	hrs = 0xff;
304
305	if (min >= 60)
306	min = 0xff;
307
308	if (sec != 0)
309	return -EINVAL;
310
311	min = bin2bcd(min);
312	hrs = bin2bcd(hrs);
313
314	spin_lock(&priv->lock);
315	ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM);
316	ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM);
317	spin_unlock(&priv->lock);
318
319	return 0;
320	}
321
322	static const struct rtc_class_ops ds1286_ops = {
16380c15 JS	323	.ioctl = ds1286_ioctl,
16380c15 JS	324	.proc = ds1286_proc,
5f119f29 TB	325	.read_time = ds1286_read_time,
	326	.set_time = ds1286_set_time,
	327	.read_alarm = ds1286_read_alarm,
	328	.set_alarm = ds1286_set_alarm,
16380c15	329	.alarm_irq_enable = ds1286_alarm_irq_enable,
5f119f29 TB	330	};
	331
	332	static int __devinit ds1286_probe(struct platform_device *pdev)
	333	{
	334	struct rtc_device *rtc;
	335	struct resource *res;
	336	struct ds1286_priv *priv;
	337	int ret = 0;
	338
	339	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	340	if (!res)
	341	return -ENODEV;
	342	priv = kzalloc(sizeof(struct ds1286_priv), GFP_KERNEL);
	343	if (!priv)
	344	return -ENOMEM;
	345
28f65c11	346	priv->size = resource_size(res);
5f119f29 TB	347	if (!request_mem_region(res->start, priv->size, pdev->name)) {
	348	ret = -EBUSY;
	349	goto out;
	350	}
	351	priv->baseaddr = res->start;
	352	priv->rtcregs = ioremap(priv->baseaddr, priv->size);
	353	if (!priv->rtcregs) {
	354	ret = -ENOMEM;
	355	goto out;
	356	}
	357	spin_lock_init(&priv->lock);
9a281a67	358	platform_set_drvdata(pdev, priv);
5f119f29 TB	359	rtc = rtc_device_register("ds1286", &pdev->dev,
	360	&ds1286_ops, THIS_MODULE);
	361	if (IS_ERR(rtc)) {
	362	ret = PTR_ERR(rtc);
	363	goto out;
	364	}
	365	priv->rtc = rtc;
5f119f29 TB	366	return 0;
	367
	368	out:
	369	if (priv->rtc)
	370	rtc_device_unregister(priv->rtc);
	371	if (priv->rtcregs)
	372	iounmap(priv->rtcregs);
	373	if (priv->baseaddr)
	374	release_mem_region(priv->baseaddr, priv->size);
	375	kfree(priv);
	376	return ret;
	377	}
	378
	379	static int __devexit ds1286_remove(struct platform_device *pdev)
	380	{
	381	struct ds1286_priv *priv = platform_get_drvdata(pdev);
	382
	383	rtc_device_unregister(priv->rtc);
	384	iounmap(priv->rtcregs);
	385	release_mem_region(priv->baseaddr, priv->size);
	386	kfree(priv);
	387	return 0;
	388	}
	389
	390	static struct platform_driver ds1286_platform_driver = {
	391	.driver = {
	392	.name = "rtc-ds1286",
	393	.owner = THIS_MODULE,
	394	},
	395	.probe = ds1286_probe,
	396	.remove = __devexit_p(ds1286_remove),
	397	};
	398
0c4eae66	399	module_platform_driver(ds1286_platform_driver);
5f119f29 TB	400
	401	MODULE_AUTHOR("Thomas Bogendoerfer <[email protected]>");
	402	MODULE_DESCRIPTION("DS1286 RTC driver");
	403	MODULE_LICENSE("GPL");
	404	MODULE_VERSION(DRV_VERSION);
	405	MODULE_ALIAS("platform:rtc-ds1286");