20 files changed, 1577 insertions, 478 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b57fba5c6d0..f660ef3e5b2 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -220,22 +220,22 @@ config RTC_DRV_PCF8583
 	  will be called rtc-pcf8583.
 
 config RTC_DRV_M41T80
-	tristate "ST M41T80/81/82/83/84/85/87"
+	tristate "ST M41T65/M41T80/81/82/83/84/85/87"
 	help
-	  If you say Y here you will get support for the
-	  ST M41T80 RTC chips series. Currently following chips are
-	  supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85
-	  and M41ST87.
+	  If you say Y here you will get support for the ST M41T60
+	  and M41T80 RTC chips series. Currently, the following chips are
+	  supported: M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
+	  M41ST85, and M41ST87.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-m41t80.
 
 config RTC_DRV_M41T80_WDT
-	bool "ST M41T80 series RTC watchdog timer"
+	bool "ST M41T65/M41T80 series RTC watchdog timer"
 	depends on RTC_DRV_M41T80
 	help
 	  If you say Y here you will get support for the
-	  watchdog timer in ST M41T80 RTC chips series.
+	  watchdog timer in the ST M41T60 and M41T80 RTC chips series.
 
 config RTC_DRV_TWL92330
 	boolean "TI TWL92330/Menelaus"
@@ -319,6 +319,15 @@ config RTC_DRV_RS5C348
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-rs5c348.
 
+config RTC_DRV_DS3234
+	tristate "Maxim/Dallas DS3234"
+	help
+	  If you say yes here you get support for the
+	  Maxim/Dallas DS3234 SPI RTC chip.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-ds3234.
+
 endif # SPI_MASTER
 
 comment "Platform RTC drivers"
@@ -352,6 +361,11 @@ config RTC_DRV_DS1216
 	help
 	  If you say yes here you get support for the Dallas DS1216 RTC chips.
 
+config RTC_DRV_DS1286
+	tristate "Dallas DS1286"
+	help
+	  If you say yes here you get support for the Dallas DS1286 RTC chips.
+
 config RTC_DRV_DS1302
 	tristate "Dallas DS1302"
 	depends on SH_SECUREEDGE5410
@@ -405,6 +419,15 @@ config RTC_DRV_M48T86
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-m48t86.
 
+config RTC_DRV_M48T35
+	tristate "ST M48T35"
+	help
+	  If you say Y here you will get support for the
+	  ST M48T35 RTC chip.
+
+	  This driver can also be built as a module, if so, the module
+	  will be called "rtc-m48t35".
+
 config RTC_DRV_M48T59
 	tristate "ST M48T59/M48T08/M48T02"
 	help
@@ -589,7 +612,7 @@ config RTC_DRV_RS5C313
 
 config RTC_DRV_PPC
        tristate "PowerPC machine dependent RTC support"
-       depends on PPC_MERGE
+       depends on PPC
        help
 	 The PowerPC kernel has machine-specific functions for accessing
 	 the RTC. This exposes that functionality through the generic RTC
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 10f41f85c38..d05928b3ca9 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_RTC_DRV_AT91SAM9)	+= rtc-at91sam9.o
 obj-$(CONFIG_RTC_DRV_BFIN)	+= rtc-bfin.o
 obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o
 obj-$(CONFIG_RTC_DRV_DS1216)	+= rtc-ds1216.o
+obj-$(CONFIG_RTC_DRV_DS1286)	+= rtc-ds1286.o
 obj-$(CONFIG_RTC_DRV_DS1302)	+= rtc-ds1302.o
 obj-$(CONFIG_RTC_DRV_DS1305)	+= rtc-ds1305.o
 obj-$(CONFIG_RTC_DRV_DS1307)	+= rtc-ds1307.o
@@ -31,11 +32,13 @@ obj-$(CONFIG_RTC_DRV_DS1511)	+= rtc-ds1511.o
 obj-$(CONFIG_RTC_DRV_DS1553)	+= rtc-ds1553.o
 obj-$(CONFIG_RTC_DRV_DS1672)	+= rtc-ds1672.o
 obj-$(CONFIG_RTC_DRV_DS1742)	+= rtc-ds1742.o
+obj-$(CONFIG_RTC_DRV_DS3234)	+= rtc-ds3234.o
 obj-$(CONFIG_RTC_DRV_EP93XX)	+= rtc-ep93xx.o
 obj-$(CONFIG_RTC_DRV_FM3130)	+= rtc-fm3130.o
 obj-$(CONFIG_RTC_DRV_ISL1208)	+= rtc-isl1208.o
 obj-$(CONFIG_RTC_DRV_M41T80)	+= rtc-m41t80.o
 obj-$(CONFIG_RTC_DRV_M41T94)	+= rtc-m41t94.o
+obj-$(CONFIG_RTC_DRV_M48T35)	+= rtc-m48t35.o
 obj-$(CONFIG_RTC_DRV_M48T59)	+= rtc-m48t59.o
 obj-$(CONFIG_RTC_DRV_M48T86)	+= rtc-m48t86.o
 obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index 4e888cc8be5..37082616482 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -29,10 +29,10 @@
 #include <linux/completion.h>
 
 #include <asm/uaccess.h>
+
 #include <mach/at91_rtc.h>
 
 
-#define AT91_RTC_FREQ		1
 #define AT91_RTC_EPOCH		1900UL	/* just like arch/arm/common/rtctime.c */
 
 static DECLARE_COMPLETION(at91_rtc_updated);
@@ -228,8 +228,6 @@ static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
 			(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
 	seq_printf(seq, "periodic_IRQ\t: %s\n",
 			(imr & AT91_RTC_SECEV) ? "yes" : "no");
-	seq_printf(seq, "periodic_freq\t: %ld\n",
-			(unsigned long) AT91_RTC_FREQ);
 
 	return 0;
 }
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 52e2743b04e..079e9ed907e 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -432,9 +432,15 @@ static int rtc_dev_release(struct inode *inode, struct file *file)
 {
 	struct rtc_device *rtc = file->private_data;
 
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
-	clear_uie(rtc);
-#endif
+	/* We shut down the repeating IRQs that userspace enabled,
+	 * since nothing is listening to them.
+	 *  - Update (UIE) ... currently only managed through ioctls
+	 *  - Periodic (PIE) ... also used through rtc_*() interface calls
+	 *
+	 * Leave the alarm alone; it may be set to trigger a system wakeup
+	 * later, or be used by kernel code, and is a one-shot event anyway.
+	 */
+	rtc_dev_ioctl(file, RTC_UIE_OFF, 0);
 	rtc_irq_set_state(rtc, NULL, 0);
 
 	if (rtc->ops->release)
diff --git a/drivers/rtc/rtc-ds1286.c b/drivers/rtc/rtc-ds1286.c
new file mode 100644
index 00000000000..4b4c1b6a418
--- /dev/null
+++ b/drivers/rtc/rtc-ds1286.c
@@ -0,0 +1,409 @@
+/*
+ * 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>
+
+#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]);
+}
+
+#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_AIE_OFF:
+		/* Mask alarm int. enab. bit	*/
+		spin_lock_irqsave(&priv->lock, flags);
+		val = ds1286_rtc_read(priv, RTC_CMD);
+		val |=  RTC_TDM;
+		ds1286_rtc_write(priv, val, RTC_CMD);
+		spin_unlock_irqrestore(&priv->lock, flags);
+		break;
+	case RTC_AIE_ON:
+		/* Allow alarm interrupts.	*/
+		spin_lock_irqsave(&priv->lock, flags);
+		val = ds1286_rtc_read(priv, RTC_CMD);
+		val &=  ~RTC_TDM;
+		ds1286_rtc_write(priv, val, RTC_CMD);
+		spin_unlock_irqrestore(&priv->lock, flags);
+		break;
+	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,
+};
+
+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 = res->end - res->start + 1;
+	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);
+	rtc = rtc_device_register("ds1286", &pdev->dev,
+				  &ds1286_ops, THIS_MODULE);
+	if (IS_ERR(rtc)) {
+		ret = PTR_ERR(rtc);
+		goto out;
+	}
+	priv->rtc = rtc;
+	platform_set_drvdata(pdev, priv);
+	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),
+};
+
+static int __init ds1286_init(void)
+{
+	return platform_driver_register(&ds1286_platform_driver);
+}
+
+static void __exit ds1286_exit(void)
+{
+	platform_driver_unregister(&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");
+
+module_init(ds1286_init);
+module_exit(ds1286_exit);
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index bbf97e65202..4fcf0734a6e 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -23,10 +23,6 @@
  * to have set the chip up as a clock (turning on the oscillator and
  * setting the date and time), Linux can ignore the non-clock features.
  * That's a natural job for a factory or repair bench.
- *
- * This is currently a simple no-alarms driver.  If your board has the
- * alarm irq wired up on a ds1337 or ds1339, and you want to use that,
- * then look at the rtc-rs5c372 driver for code to steal...
  */
 enum ds_type {
 	ds_1307,
@@ -67,6 +63,7 @@ enum ds_type {
 #	define DS1307_BIT_RS0		0x01
 #define DS1337_REG_CONTROL	0x0e
 #	define DS1337_BIT_nEOSC		0x80
+#	define DS1339_BIT_BBSQI		0x20
 #	define DS1337_BIT_RS2		0x10
 #	define DS1337_BIT_RS1		0x08
 #	define DS1337_BIT_INTCN		0x04
@@ -83,19 +80,22 @@ enum ds_type {
 #	define DS1337_BIT_OSF		0x80
 #	define DS1337_BIT_A2I		0x02
 #	define DS1337_BIT_A1I		0x01
+#define DS1339_REG_ALARM1_SECS	0x07
 #define DS1339_REG_TRICKLE	0x10
 
 
 
 struct ds1307 {
 	u8			reg_addr;
-	bool			has_nvram;
-	u8			regs[8];
+	u8			regs[11];
 	enum ds_type		type;
+	unsigned long		flags;
+#define HAS_NVRAM	0		/* bit 0 == sysfs file active */
+#define HAS_ALARM	1		/* bit 1 == irq claimed */
 	struct i2c_msg		msg[2];
 	struct i2c_client	*client;
-	struct i2c_client	dev;
 	struct rtc_device	*rtc;
+	struct work_struct	work;
 };
 
 struct chip_desc {
@@ -132,12 +132,79 @@ static const struct i2c_device_id ds1307_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, ds1307_id);
 
+/*----------------------------------------------------------------------*/
+
+/*
+ * The IRQ logic includes a "real" handler running in IRQ context just
+ * long enough to schedule this workqueue entry.   We need a task context
+ * to talk to the RTC, since I2C I/O calls require that; and disable the
+ * IRQ until we clear its status on the chip, so that this handler can
+ * work with any type of triggering (not just falling edge).
+ *
+ * The ds1337 and ds1339 both have two alarms, but we only use the first
+ * one (with a "seconds" field).  For ds1337 we expect nINTA is our alarm
+ * signal; ds1339 chips have only one alarm signal.
+ */
+static void ds1307_work(struct work_struct *work)
+{
+	struct ds1307		*ds1307;
+	struct i2c_client	*client;
+	struct mutex		*lock;
+	int			stat, control;
+
+	ds1307 = container_of(work, struct ds1307, work);
+	client = ds1307->client;
+	lock = &ds1307->rtc->ops_lock;
+
+	mutex_lock(lock);
+	stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
+	if (stat < 0)
+		goto out;
+
+	if (stat & DS1337_BIT_A1I) {
+		stat &= ~DS1337_BIT_A1I;
+		i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat);
+
+		control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
+		if (control < 0)
+			goto out;
+
+		control &= ~DS1337_BIT_A1IE;
+		i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
+
+		/* rtc_update_irq() assumes that it is called
+		 * from IRQ-disabled context.
+		 */
+		local_irq_disable();
+		rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
+		local_irq_enable();
+	}
+
+out:
+	if (test_bit(HAS_ALARM, &ds1307->flags))
+		enable_irq(client->irq);
+	mutex_unlock(lock);
+}
+
+static irqreturn_t ds1307_irq(int irq, void *dev_id)
+{
+	struct i2c_client	*client = dev_id;
+	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+
+	disable_irq_nosync(irq);
+	schedule_work(&ds1307->work);
+	return IRQ_HANDLED;
+}
+
+/*----------------------------------------------------------------------*/
+
 static int ds1307_get_time(struct device *dev, struct rtc_time *t)
 {
 	struct ds1307	*ds1307 = dev_get_drvdata(dev);
 	int		tmp;
 
 	/* read the RTC date and time registers all at once */
+	ds1307->reg_addr = 0;
 	ds1307->msg[1].flags = I2C_M_RD;
 	ds1307->msg[1].len = 7;
 
@@ -231,9 +298,186 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
 	return 0;
 }
 
+static int ds1307_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct i2c_client       *client = to_i2c_client(dev);
+	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+	int			ret;
+
+	if (!test_bit(HAS_ALARM, &ds1307->flags))
+		return -EINVAL;
+
+	/* read all ALARM1, ALARM2, and status registers at once */
+	ds1307->reg_addr = DS1339_REG_ALARM1_SECS;
+	ds1307->msg[1].flags = I2C_M_RD;
+	ds1307->msg[1].len = 9;
+
+	ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
+			ds1307->msg, 2);
+	if (ret != 2) {
+		dev_err(dev, "%s error %d\n", "alarm read", ret);
+		return -EIO;
+	}
+
+	dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n",
+			"alarm read",
+			ds1307->regs[0], ds1307->regs[1],
+			ds1307->regs[2], ds1307->regs[3],
+			ds1307->regs[4], ds1307->regs[5],
+			ds1307->regs[6], ds1307->regs[7],
+			ds1307->regs[8]);
+
+	/* report alarm time (ALARM1); assume 24 hour and day-of-month modes,
+	 * and that all four fields are checked matches
+	 */
+	t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f);
+	t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f);
+	t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f);
+	t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f);
+	t->time.tm_mon = -1;
+	t->time.tm_year = -1;
+	t->time.tm_wday = -1;
+	t->time.tm_yday = -1;
+	t->time.tm_isdst = -1;
+
+	/* ... and status */
+	t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE);
+	t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I);
+
+	dev_dbg(dev, "%s secs=%d, mins=%d, "
+		"hours=%d, mday=%d, enabled=%d, pending=%d\n",
+		"alarm read", t->time.tm_sec, t->time.tm_min,
+		t->time.tm_hour, t->time.tm_mday,
+		t->enabled, t->pending);
+
+	return 0;
+}
+
+static int ds1307_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct i2c_client       *client = to_i2c_client(dev);
+	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+	unsigned char		*buf = ds1307->regs;
+	u8			control, status;
+	int			ret;
+
+	if (!test_bit(HAS_ALARM, &ds1307->flags))
+		return -EINVAL;
+
+	dev_dbg(dev, "%s secs=%d, mins=%d, "
+		"hours=%d, mday=%d, enabled=%d, pending=%d\n",
+		"alarm set", t->time.tm_sec, t->time.tm_min,
+		t->time.tm_hour, t->time.tm_mday,
+		t->enabled, t->pending);
+
+	/* read current status of both alarms and the chip */
+	ds1307->reg_addr = DS1339_REG_ALARM1_SECS;
+	ds1307->msg[1].flags = I2C_M_RD;
+	ds1307->msg[1].len = 9;
+
+	ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
+			ds1307->msg, 2);
+	if (ret != 2) {
+		dev_err(dev, "%s error %d\n", "alarm write", ret);
+		return -EIO;
+	}
+	control = ds1307->regs[7];
+	status = ds1307->regs[8];
+
+	dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n",
+			"alarm set (old status)",
+			ds1307->regs[0], ds1307->regs[1],
+			ds1307->regs[2], ds1307->regs[3],
+			ds1307->regs[4], ds1307->regs[5],
+			ds1307->regs[6], control, status);
+
+	/* set ALARM1, using 24 hour and day-of-month modes */
+	*buf++ = DS1339_REG_ALARM1_SECS;	/* first register addr */
+	buf[0] = bin2bcd(t->time.tm_sec);
+	buf[1] = bin2bcd(t->time.tm_min);
+	buf[2] = bin2bcd(t->time.tm_hour);
+	buf[3] = bin2bcd(t->time.tm_mday);
+
+	/* set ALARM2 to non-garbage */
+	buf[4] = 0;
+	buf[5] = 0;
+	buf[6] = 0;
+
+	/* optionally enable ALARM1 */
+	buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE);
+	if (t->enabled) {
+		dev_dbg(dev, "alarm IRQ armed\n");
+		buf[7] |= DS1337_BIT_A1IE;	/* only ALARM1 is used */
+	}
+	buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
+
+	ds1307->msg[1].flags = 0;
+	ds1307->msg[1].len = 10;
+
+	ret = i2c_transfer(to_i2c_adapter(client->dev.parent),
+			&ds1307->msg[1], 1);
+	if (ret != 1) {
+		dev_err(dev, "can't set alarm time\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int ds1307_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+	struct i2c_client	*client = to_i2c_client(dev);
+	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+	int			ret;
+
+	switch (cmd) {
+	case RTC_AIE_OFF:
+		if (!test_bit(HAS_ALARM, &ds1307->flags))
+			return -ENOTTY;
+
+		ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
+		if (ret < 0)
+			return ret;
+
+		ret &= ~DS1337_BIT_A1IE;
+
+		ret = i2c_smbus_write_byte_data(client,
+						DS1337_REG_CONTROL, ret);
+		if (ret < 0)
+			return ret;
+
+		break;
+
+	case RTC_AIE_ON:
+		if (!test_bit(HAS_ALARM, &ds1307->flags))
+			return -ENOTTY;
+
+		ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
+		if (ret < 0)
+			return ret;
+
+		ret |= DS1337_BIT_A1IE;
+
+		ret = i2c_smbus_write_byte_data(client,
+						DS1337_REG_CONTROL, ret);
+		if (ret < 0)
+			return ret;
+
+		break;
+
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return 0;
+}
+
 static const struct rtc_class_ops ds13xx_rtc_ops = {
 	.read_time	= ds1307_get_time,
 	.set_time	= ds1307_set_time,
+	.read_alarm	= ds1307_read_alarm,
+	.set_alarm	= ds1307_set_alarm,
+	.ioctl		= ds1307_ioctl,
 };
 
 /*----------------------------------------------------------------------*/
@@ -327,6 +571,7 @@ static int __devinit ds1307_probe(struct i2c_client *client,
 	int			tmp;
 	const struct chip_desc	*chip = &chips[id->driver_data];
 	struct i2c_adapter	*adapter = to_i2c_adapter(client->dev.parent);
+	int			want_irq = false;
 
 	if (!i2c_check_functionality(adapter,
 			I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
@@ -353,6 +598,12 @@ static int __devinit ds1307_probe(struct i2c_client *client,
 	switch (ds1307->type) {
 	case ds_1337:
 	case ds_1339:
+		/* has IRQ? */
+		if (ds1307->client->irq > 0 && chip->alarm) {
+			INIT_WORK(&ds1307->work, ds1307_work);
+			want_irq = true;
+		}
+
 		ds1307->reg_addr = DS1337_REG_CONTROL;
 		ds1307->msg[1].len = 2;
 
@@ -369,8 +620,20 @@ static int __devinit ds1307_probe(struct i2c_client *client,
 
 		/* oscillator off?  turn it on, so clock can tick. */
 		if (ds1307->regs[0] & DS1337_BIT_nEOSC)
-			i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL,
-				ds1307->regs[0] & ~DS1337_BIT_nEOSC);
+			ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
+
+		/* Using IRQ?  Disable the square wave and both alarms.
+		 * For ds1339, be sure alarms can trigger when we're
+		 * running on Vbackup (BBSQI); we assume ds1337 will
+		 * ignore that bit
+		 */
+		if (want_irq) {
+			ds1307->regs[0] |= DS1337_BIT_INTCN | DS1339_BIT_BBSQI;
+			ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
+		}
+
+		i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL,
+							ds1307->regs[0]);
 
 		/* oscillator fault?  clear flag, and warn */
 		if (ds1307->regs[1] & DS1337_BIT_OSF) {
@@ -495,10 +758,22 @@ read_rtc:
 		goto exit_free;
 	}
 
+	if (want_irq) {
+		err = request_irq(client->irq, ds1307_irq, 0,
+			  ds1307->rtc->name, client);
+		if (err) {
+			dev_err(&client->dev,
+				"unable to request IRQ!\n");
+			goto exit_irq;
+		}
+		set_bit(HAS_ALARM, &ds1307->flags);
+		dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
+	}
+
 	if (chip->nvram56) {
 		err = sysfs_create_bin_file(&client->dev.kobj, &nvram);
 		if (err == 0) {
-			ds1307->has_nvram = true;
+			set_bit(HAS_NVRAM, &ds1307->flags);
 			dev_info(&client->dev, "56 bytes nvram\n");
 		}
 	}
@@ -512,7 +787,9 @@ exit_bad:
 			ds1307->regs[2], ds1307->regs[3],
 			ds1307->regs[4], ds1307->regs[5],
 			ds1307->regs[6]);
-
+exit_irq:
+	if (ds1307->rtc)
+		rtc_device_unregister(ds1307->rtc);
 exit_free:
 	kfree(ds1307);
 	return err;
@@ -520,9 +797,14 @@ exit_free:
 
 static int __devexit ds1307_remove(struct i2c_client *client)
 {
-	struct ds1307	*ds1307 = i2c_get_clientdata(client);
+	struct ds1307		*ds1307 = i2c_get_clientdata(client);
+
+	if (test_and_clear_bit(