[PATCH] RTC subsystem: class

Add the basic RTC subsystem infrastructure to the kernel. rtc/class.c - registration facilities for RTC drivers rtc/interface.c - kernel/rtc interface functions rtc/hctosys.c - snippet of code that copies hw clock to sw clock at bootup, if configured to do so. Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] RTC subsystem: class
Add the basic RTC subsystem infrastructure to the kernel. rtc/class.c - registration facilities for RTC drivers rtc/interface.c - kernel/rtc interface functions rtc/hctosys.c - snippet of code that copies hw clock to sw clock at bootup, if configured to do so. Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Alessandro Zummo · Linus Torvalds
1 parent 4079c39aaa
Showing 8 changed files with 633 additions and 5 deletions Side-by-side Diff
CREDITS
MAINTAINERS
drivers/rtc/Kconfig
drivers/rtc/Makefile
drivers/rtc/class.c
drivers/rtc/hctosys.c
drivers/rtc/interface.c
include/linux/rtc.h
@@ -3741,10 +3741,11 @@
 D: Miscellaneous kernel fixes
  
 N: Alessandro Zummo
-E: azummo@ita.flashnet.it
-W: http://freepage.logicom.it/azummo/
+E: a.zummo@towertech.it
 D: CMI8330 support is sb_card.c
 D: ISAPnP fixes in sb_card.c
+D: ZyXEL omni.net lcd plus driver
+D: RTC subsystem
 S: Italy
  
 N: Marc Zyngier
@@ -2233,6 +2233,12 @@
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
  
+REAL TIME CLOCK (RTC) SUBSYSTEM
+P:	Alessandro Zummo
+M:	a.zummo@towertech.it
+L:	linux-kernel@vger.kernel.org
+S:	Maintained
+
 REISERFS FILE SYSTEM
 P:	Hans Reiser
 M:	reiserfs-dev@namesys.com
-#
+\#
 # RTC class/drivers configuration
 #
  
+menu "Real Time Clock"
+
 config RTC_LIB
 	tristate
+
+config RTC_CLASS
+	tristate "RTC class"
+	depends on EXPERIMENTAL
+	default n
+	select RTC_LIB
+	help
+	  Generic RTC class support. If you say yes here, you will
+ 	  be allowed to plug one or more RTCs to your system. You will
+	  probably want to enable one of more of the interfaces below.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-class.
+
+config RTC_HCTOSYS
+	bool "Set system time from RTC on startup"
+	depends on RTC_CLASS = y
+	default y
+	help
+	  If you say yes here, the system time will be set using
+	  the value read from the specified RTC device. This is useful
+	  in order to avoid unnecessary fschk runs.
+
+config RTC_HCTOSYS_DEVICE
+	string "The RTC to read the time from"
+	depends on RTC_HCTOSYS = y
+	default "rtc0"
+	help
+	  The RTC device that will be used as the source for
+	  the system time, usually rtc0.
+
+comment "RTC interfaces"
+	depends on RTC_CLASS
+
+comment "RTC drivers"
+	depends on RTC_CLASS
+
+endmenu
@@ -2,5 +2,8 @@
 # Makefile for RTC class/drivers.
 #
  
-obj-$(CONFIG_RTC_LIB)	+= rtc-lib.o
+obj-$(CONFIG_RTC_LIB)		+= rtc-lib.o
+obj-$(CONFIG_RTC_HCTOSYS)	+= hctosys.o
+obj-$(CONFIG_RTC_CLASS)		+= rtc-core.o
+rtc-core-y			:= class.o interface.o
+/*
+ * RTC subsystem, base class
+ *
+ * Copyright (C) 2005 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * class skeleton from drivers/hwmon/hwmon.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/kdev_t.h>
+#include <linux/idr.h>
+
+static DEFINE_IDR(rtc_idr);
+static DEFINE_MUTEX(idr_lock);
+struct class *rtc_class;
+
+static void rtc_device_release(struct class_device *class_dev)
+{
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+	mutex_lock(&idr_lock);
+	idr_remove(&rtc_idr, rtc->id);
+	mutex_unlock(&idr_lock);
+	kfree(rtc);
+}
+
+/**
+ * rtc_device_register - register w/ RTC class
+ * @dev: the device to register
+ *
+ * rtc_device_unregister() must be called when the class device is no
+ * longer needed.
+ *
+ * Returns the pointer to the new struct class device.
+ */
+struct rtc_device *rtc_device_register(const char *name, struct device *dev,
+					struct rtc_class_ops *ops,
+					struct module *owner)
+{
+	struct rtc_device *rtc;
+	int id, err;
+
+	if (idr_pre_get(&rtc_idr, GFP_KERNEL) == 0) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+
+	mutex_lock(&idr_lock);
+	err = idr_get_new(&rtc_idr, NULL, &id);
+	mutex_unlock(&idr_lock);
+
+	if (err < 0)
+		goto exit;
+
+	id = id & MAX_ID_MASK;
+
+	rtc = kzalloc(sizeof(struct rtc_device), GFP_KERNEL);
+	if (rtc == NULL) {
+		err = -ENOMEM;
+		goto exit_idr;
+	}
+
+	rtc->id = id;
+	rtc->ops = ops;
+	rtc->owner = owner;
+	rtc->class_dev.dev = dev;
+	rtc->class_dev.class = rtc_class;
+	rtc->class_dev.release = rtc_device_release;
+
+	mutex_init(&rtc->ops_lock);
+	spin_lock_init(&rtc->irq_lock);
+	spin_lock_init(&rtc->irq_task_lock);
+
+	strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE);
+	snprintf(rtc->class_dev.class_id, BUS_ID_SIZE, "rtc%d", id);
+
+	err = class_device_register(&rtc->class_dev);
+	if (err)
+		goto exit_kfree;
+
+	dev_info(dev, "rtc core: registered %s as %s\n",
+			rtc->name, rtc->class_dev.class_id);
+
+	return rtc;
+
+exit_kfree:
+	kfree(rtc);
+
+exit_idr:
+	idr_remove(&rtc_idr, id);
+
+exit:
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(rtc_device_register);
+
+
+/**
+ * rtc_device_unregister - removes the previously registered RTC class device
+ *
+ * @rtc: the RTC class device to destroy
+ */
+void rtc_device_unregister(struct rtc_device *rtc)
+{
+	mutex_lock(&rtc->ops_lock);
+	rtc->ops = NULL;
+	mutex_unlock(&rtc->ops_lock);
+	class_device_unregister(&rtc->class_dev);
+}
+EXPORT_SYMBOL_GPL(rtc_device_unregister);
+
+int rtc_interface_register(struct class_interface *intf)
+{
+	intf->class = rtc_class;
+	return class_interface_register(intf);
+}
+EXPORT_SYMBOL_GPL(rtc_interface_register);
+
+static int __init rtc_init(void)
+{
+	rtc_class = class_create(THIS_MODULE, "rtc");
+	if (IS_ERR(rtc_class)) {
+		printk(KERN_ERR "%s: couldn't create class\n", __FILE__);
+		return PTR_ERR(rtc_class);
+	}
+	return 0;
+}
+
+static void __exit rtc_exit(void)
+{
+	class_destroy(rtc_class);
+}
+
+module_init(rtc_init);
+module_exit(rtc_exit);
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towerteh.it>");
+MODULE_DESCRIPTION("RTC class support");
+MODULE_LICENSE("GPL");
+/*
+ * RTC subsystem, initialize system time on startup
+ *
+ * Copyright (C) 2005 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/rtc.h>
+
+/* IMPORTANT: the RTC only stores whole seconds. It is arbitrary
+ * whether it stores the most close value or the value with partial
+ * seconds truncated. However, it is important that we use it to store
+ * the truncated value. This is because otherwise it is necessary,
+ * in an rtc sync function, to read both xtime.tv_sec and
+ * xtime.tv_nsec. On some processors (i.e. ARM), an atomic read
+ * of >32bits is not possible. So storing the most close value would
+ * slow down the sync API. So here we have the truncated value and
+ * the best guess is to add 0.5s.
+ */
+
+static int __init rtc_hctosys(void)
+{
+	int err;
+	struct rtc_time tm;
+	struct class_device *class_dev = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
+
+	if (class_dev == NULL) {
+		printk("%s: unable to open rtc device (%s)\n",
+			__FILE__, CONFIG_RTC_HCTOSYS_DEVICE);
+		return -ENODEV;
+	}
+
+	err = rtc_read_time(class_dev, &tm);
+	if (err == 0) {
+		err = rtc_valid_tm(&tm);
+		if (err == 0) {
+			struct timespec tv;
+
+			tv.tv_nsec = NSEC_PER_SEC >> 1;
+
+			rtc_tm_to_time(&tm, &tv.tv_sec);
+
+			do_settimeofday(&tv);
+
+			dev_info(class_dev->dev,
+				"setting the system clock to "
+				"%d-%02d-%02d %02d:%02d:%02d (%u)\n",
+				tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+				tm.tm_hour, tm.tm_min, tm.tm_sec,
+				(unsigned int) tv.tv_sec);
+		}
+		else
+			dev_err(class_dev->dev,
+				"hctosys: invalid date/time\n");
+	}
+	else
+		dev_err(class_dev->dev,
+			"hctosys: unable to read the hardware clock\n");
+
+	rtc_class_close(class_dev);
+
+	return 0;
+}
+
+late_initcall(rtc_hctosys);
+/*
+ * RTC subsystem, interface functions
+ *
+ * Copyright (C) 2005 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * based on arch/arm/common/rtctime.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/rtc.h>
+
+int rtc_read_time(struct class_device *class_dev, struct rtc_time *tm)
+{
+	int err;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	err = mutex_lock_interruptible(&rtc->ops_lock);
+	if (err)
+		return -EBUSY;
+
+	if (!rtc->ops)
+		err = -ENODEV;
+	else if (!rtc->ops->read_time)
+		err = -EINVAL;
+	else {
+		memset(tm, 0, sizeof(struct rtc_time));
+		err = rtc->ops->read_time(class_dev->dev, tm);
+	}
+
+	mutex_unlock(&rtc->ops_lock);
+	return err;
+}
+EXPORT_SYMBOL_GPL(rtc_read_time);
+
+int rtc_set_time(struct class_device *class_dev, struct rtc_time *tm)
+{
+	int err;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	err = rtc_valid_tm(tm);
+	if (err != 0)
+		return err;
+
+	err = mutex_lock_interruptible(&rtc->ops_lock);
+	if (err)
+		return -EBUSY;
+
+	if (!rtc->ops)
+		err = -ENODEV;
+	else if (!rtc->ops->set_time)
+		err = -EINVAL;
+	else
+		err = rtc->ops->set_time(class_dev->dev, tm);
+
+	mutex_unlock(&rtc->ops_lock);
+	return err;
+}
+EXPORT_SYMBOL_GPL(rtc_set_time);
+
+int rtc_set_mmss(struct class_device *class_dev, unsigned long secs)
+{
+	int err;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	err = mutex_lock_interruptible(&rtc->ops_lock);
+	if (err)
+		return -EBUSY;
+
+	if (!rtc->ops)
+		err = -ENODEV;
+	else if (rtc->ops->set_mmss)
+		err = rtc->ops->set_mmss(class_dev->dev, secs);
+	else if (rtc->ops->read_time && rtc->ops->set_time) {
+		struct rtc_time new, old;
+
+		err = rtc->ops->read_time(class_dev->dev, &old);
+		if (err == 0) {
+			rtc_time_to_tm(secs, &new);
+
+			/*
+			 * avoid writing when we're going to change the day of
+			 * the month. We will retry in the next minute. This
+			 * basically means that if the RTC must not drift
+			 * by more than 1 minute in 11 minutes.
+			 */
+			if (!((old.tm_hour == 23 && old.tm_min == 59) ||
+				(new.tm_hour == 23 && new.tm_min == 59)))
+				err = rtc->ops->set_time(class_dev->dev, &new);
+		}
+	}
+	else
+		err = -EINVAL;
+
+	mutex_unlock(&rtc->ops_lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(rtc_set_mmss);
+
+int rtc_read_alarm(struct class_device *class_dev, struct rtc_wkalrm *alarm)
+{
+	int err;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	err = mutex_lock_interruptible(&rtc->ops_lock);
+	if (err)
+		return -EBUSY;
+
+	if (rtc->ops == NULL)
+		err = -ENODEV;
+	else if (!rtc->ops->read_alarm)
+		err = -EINVAL;
+	else {
+		memset(alarm, 0, sizeof(struct rtc_wkalrm));
+		err = rtc->ops->read_alarm(class_dev->dev, alarm);
+	}
+
+	mutex_unlock(&rtc->ops_lock);
+	return err;
+}
+EXPORT_SYMBOL_GPL(rtc_read_alarm);
+
+int rtc_set_alarm(struct class_device *class_dev, struct rtc_wkalrm *alarm)
+{
+	int err;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	err = mutex_lock_interruptible(&rtc->ops_lock);
+	if (err)
+		return -EBUSY;
+
+	if (!rtc->ops)
+		err = -ENODEV;
+	else if (!rtc->ops->set_alarm)
+		err = -EINVAL;
+	else
+		err = rtc->ops->set_alarm(class_dev->dev, alarm);
+
+	mutex_unlock(&rtc->ops_lock);
+	return err;
+}
+EXPORT_SYMBOL_GPL(rtc_set_alarm);
+
+void rtc_update_irq(struct class_device *class_dev,
+		unsigned long num, unsigned long events)
+{
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	spin_lock(&rtc->irq_lock);
+	rtc->irq_data = (rtc->irq_data + (num << 8)) | events;
+	spin_unlock(&rtc->irq_lock);
+
+	spin_lock(&rtc->irq_task_lock);
+	if (rtc->irq_task)
+		rtc->irq_task->func(rtc->irq_task->private_data);
+	spin_unlock(&rtc->irq_task_lock);
+
+	wake_up_interruptible(&rtc->irq_queue);
+	kill_fasync(&rtc->async_queue, SIGIO, POLL_IN);
+}
+EXPORT_SYMBOL_GPL(rtc_update_irq);
+
+struct class_device *rtc_class_open(char *name)
+{
+	struct class_device *class_dev = NULL,
+				*class_dev_tmp;
+
+	down(&rtc_class->sem);
+	list_for_each_entry(class_dev_tmp, &rtc_class->children, node) {
+		if (strncmp(class_dev_tmp->class_id, name, BUS_ID_SIZE) == 0) {
+			class_dev = class_dev_tmp;
+			break;
+		}
+	}
+
+	if (class_dev) {
+		if (!try_module_get(to_rtc_device(class_dev)->owner))
+			class_dev = NULL;
+	}
+	up(&rtc_class->sem);
+
+	return class_dev;
+}
+EXPORT_SYMBOL_GPL(rtc_class_open);
+
+void rtc_class_close(struct class_device *class_dev)
+{
+	module_put(to_rtc_device(class_dev)->owner);
+}
+EXPORT_SYMBOL_GPL(rtc_class_close);
+
+int rtc_irq_register(struct class_device *class_dev, struct rtc_task *task)
+{
+	int retval = -EBUSY;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	if (task == NULL || task->func == NULL)
+		return -EINVAL;
+
+	spin_lock(&rtc->irq_task_lock);
+	if (rtc->irq_task == NULL) {
+		rtc->irq_task = task;
+		retval = 0;
+	}
+	spin_unlock(&rtc->irq_task_lock);
+
+	return retval;
+}
+EXPORT_SYMBOL_GPL(rtc_irq_register);
+
+void rtc_irq_unregister(struct class_device *class_dev, struct rtc_task *task)
+{
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	spin_lock(&rtc->irq_task_lock);
+	if (rtc->irq_task == task)
+		rtc->irq_task = NULL;
+	spin_unlock(&rtc->irq_task_lock);
+}
+EXPORT_SYMBOL_GPL(rtc_irq_unregister);
+
+int rtc_irq_set_state(struct class_device *class_dev, struct rtc_task *task, int enabled)
+{
+	int err = 0;
+	unsigned long flags;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	spin_lock_irqsave(&rtc->irq_task_lock, flags);
+	if (rtc->irq_task != task)
+		err = -ENXIO;
+	spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
+
+	if (err == 0)
+		err = rtc->ops->irq_set_state(class_dev->dev, enabled);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(rtc_irq_set_state);
+
+int rtc_irq_set_freq(struct class_device *class_dev, struct rtc_task *task, int freq)
+{
+	int err = 0, tmp = 0;
+	unsigned long flags;
+	struct rtc_device *rtc = to_rtc_device(class_dev);
+
+	/* allowed range is 2-8192 */
+	if (freq < 2 || freq > 8192)
+		return -EINVAL;
+/*
+	FIXME: this does not belong here, will move where appropriate
+	at a later stage. It cannot hurt right now, trust me :)
+	if ((freq > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE)))
+		return -EACCES;
+*/
+	/* check if freq is a power of 2 */
+	while (freq > (1 << tmp))
+		tmp++;
+
+	if (freq != (1 << tmp))
+		return -EINVAL;
+
+	spin_lock_irqsave(&rtc->irq_task_lock, flags);
+	if (rtc->irq_task != task)
+		err = -ENXIO;
+	spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
+
+	if (err == 0) {
+		err = rtc->ops->irq_set_freq(class_dev->dev, freq);
+		if (err == 0)
+			rtc->irq_freq = freq;
+	}
+	return err;
+}
@@ -91,6 +91,12 @@
 #define RTC_PLL_GET	_IOR('p', 0x11, struct rtc_pll_info)  /* Get PLL correction */
 #define RTC_PLL_SET	_IOW('p', 0x12, struct rtc_pll_info)  /* Set PLL correction */
  
+/* interrupt flags */
+#define RTC_IRQF 0x80 /* any of the following is active */
+#define RTC_PF 0x40
+#define RTC_AF 0x20
+#define RTC_UF 0x10
+
 #ifdef __KERNEL__
  
 #include <linux/interrupt.h>
@@ -99,6 +105,87 @@
 extern int rtc_valid_tm(struct rtc_time *tm);
 extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
 extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
+
+#include <linux/device.h>
+#include <linux/seq_file.h>
+#include <linux/cdev.h>
+#include <linux/poll.h>
+#include <linux/mutex.h>
+
+extern struct class *rtc_class;
+
+struct rtc_class_ops {
+	int (*open)(struct device *);
+	void (*release)(struct device *);
+	int (*ioctl)(struct device *, unsigned int, unsigned long);
+	int (*read_time)(struct device *, struct rtc_time *);
+	int (*set_time)(struct device *, struct rtc_time *);
+	int (*read_alarm)(struct device *, struct rtc_wkalrm *);
+	int (*set_alarm)(struct device *, struct rtc_wkalrm *);
+	int (*proc)(struct device *, struct seq_file *);
+	int (*set_mmss)(struct device *, unsigned long secs);
+	int (*irq_set_state)(struct device *, int enabled);
+	int (*irq_set_freq)(struct device *, int freq);
+	int (*read_callback)(struct device *, int data);
+};
+
+#define RTC_DEVICE_NAME_SIZE 20
+struct rtc_task;
+
+struct rtc_device
+{
+	struct class_device class_dev;
+	struct module *owner;
+
+	int id;
+	char name[RTC_DEVICE_NAME_SIZE];
+
+	struct rtc_class_ops *ops;
+	struct mutex ops_lock;
+
+	struct class_device *rtc_dev;
+	struct cdev char_dev;
+	struct mutex char_lock;
+
+	unsigned long irq_data;
+	spinlock_t irq_lock;
+	wait_queue_head_t irq_queue;
+	struct fasync_struct *async_queue;
+
+	struct rtc_task *irq_task;
+	spinlock_t irq_task_lock;
+	int irq_freq;
+};
+#define to_rtc_device(d) container_of(d, struct rtc_device, class_dev)
+
+extern struct rtc_device *rtc_device_register(const char *name,
+					struct device *dev,
+					struct rtc_class_ops *ops,
+					struct module *owner);
+extern void rtc_device_unregister(struct rtc_device *rdev);
+extern int rtc_interface_register(struct class_interface *intf);
+
+extern int rtc_read_time(struct class_device *class_dev, struct rtc_time *tm);
+extern int rtc_set_time(struct class_device *class_dev, struct rtc_time *tm);
+extern int rtc_set_mmss(struct class_device *class_dev, unsigned long secs);
+extern int rtc_read_alarm(struct class_device *class_dev,
+			struct rtc_wkalrm *alrm);
+extern int rtc_set_alarm(struct class_device *class_dev,
+				struct rtc_wkalrm *alrm);
+extern void rtc_update_irq(struct class_device *class_dev,
+			unsigned long num, unsigned long events);
+
+extern struct class_device *rtc_class_open(char *name);
+extern void rtc_class_close(struct class_device *class_dev);
+
+extern int rtc_irq_register(struct class_device *class_dev,
+				struct rtc_task *task);
+extern void rtc_irq_unregister(struct class_device *class_dev,
+				struct rtc_task *task);
+extern int rtc_irq_set_state(struct class_device *class_dev,
+				struct rtc_task *task, int enabled);
+extern int rtc_irq_set_freq(struct class_device *class_dev,
+				struct rtc_task *task, int freq);
  
 typedef struct rtc_task {
 	void (*func)(void *private_data);
...	...	@@ -3741,10 +3741,11 @@
3741	3741	D: Miscellaneous kernel fixes
3742	3742
3743	3743	N: Alessandro Zummo
3744		-E: azummo@ita.flashnet.it
3745		-W: http://freepage.logicom.it/azummo/
	3744	+E: a.zummo@towertech.it
3746	3745	D: CMI8330 support is sb_card.c
3747	3746	D: ISAPnP fixes in sb_card.c
	3747	+D: ZyXEL omni.net lcd plus driver
	3748	+D: RTC subsystem
3748	3749	S: Italy
3749	3750
3750	3751	N: Marc Zyngier
...	...	@@ -2233,6 +2233,12 @@
2233	2233	L: linux-kernel@vger.kernel.org
2234	2234	S: Maintained
2235	2235
	2236	+REAL TIME CLOCK (RTC) SUBSYSTEM
	2237	+P: Alessandro Zummo
	2238	+M: a.zummo@towertech.it
	2239	+L: linux-kernel@vger.kernel.org
	2240	+S: Maintained
	2241	+
2236	2242	REISERFS FILE SYSTEM
2237	2243	P: Hans Reiser
2238	2244	M: reiserfs-dev@namesys.com
1		-#
	1	+\#
2	2	# RTC class/drivers configuration
3	3	#
4	4
	5	+menu "Real Time Clock"
	6	+
5	7	config RTC_LIB
6	8	tristate
	9	+
	10	+config RTC_CLASS
	11	+ tristate "RTC class"
	12	+ depends on EXPERIMENTAL
	13	+ default n
	14	+ select RTC_LIB
	15	+ help
	16	+ Generic RTC class support. If you say yes here, you will
	17	+ be allowed to plug one or more RTCs to your system. You will
	18	+ probably want to enable one of more of the interfaces below.
	19	+
	20	+ This driver can also be built as a module. If so, the module
	21	+ will be called rtc-class.
	22	+
	23	+config RTC_HCTOSYS
	24	+ bool "Set system time from RTC on startup"
	25	+ depends on RTC_CLASS = y
	26	+ default y
	27	+ help
	28	+ If you say yes here, the system time will be set using
	29	+ the value read from the specified RTC device. This is useful
	30	+ in order to avoid unnecessary fschk runs.
	31	+
	32	+config RTC_HCTOSYS_DEVICE
	33	+ string "The RTC to read the time from"
	34	+ depends on RTC_HCTOSYS = y
	35	+ default "rtc0"
	36	+ help
	37	+ The RTC device that will be used as the source for
	38	+ the system time, usually rtc0.
	39	+
	40	+comment "RTC interfaces"
	41	+ depends on RTC_CLASS
	42	+
	43	+comment "RTC drivers"
	44	+ depends on RTC_CLASS
	45	+
	46	+endmenu
...	...	@@ -2,5 +2,8 @@
2	2	# Makefile for RTC class/drivers.
3	3	#
4	4
5		-obj-$(CONFIG_RTC_LIB) += rtc-lib.o
	5	+obj-$(CONFIG_RTC_LIB) += rtc-lib.o
	6	+obj-$(CONFIG_RTC_HCTOSYS) += hctosys.o
	7	+obj-$(CONFIG_RTC_CLASS) += rtc-core.o
	8	+rtc-core-y := class.o interface.o
	1	+/*
	2	+ * RTC subsystem, base class
	3	+ *
	4	+ * Copyright (C) 2005 Tower Technologies
	5	+ * Author: Alessandro Zummo <a.zummo@towertech.it>
	6	+ *
	7	+ * class skeleton from drivers/hwmon/hwmon.c
	8	+ *
	9	+ * This program is free software; you can redistribute it and/or modify
	10	+ * it under the terms of the GNU General Public License version 2 as
	11	+ * published by the Free Software Foundation.
	12	+*/
	13	+
	14	+#include <linux/module.h>
	15	+#include <linux/rtc.h>
	16	+#include <linux/kdev_t.h>
	17	+#include <linux/idr.h>
	18	+
	19	+static DEFINE_IDR(rtc_idr);
	20	+static DEFINE_MUTEX(idr_lock);
	21	+struct class *rtc_class;
	22	+
	23	+static void rtc_device_release(struct class_device *class_dev)
	24	+{
	25	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	26	+ mutex_lock(&idr_lock);
	27	+ idr_remove(&rtc_idr, rtc->id);
	28	+ mutex_unlock(&idr_lock);
	29	+ kfree(rtc);
	30	+}
	31	+
	32	+/**
	33	+ * rtc_device_register - register w/ RTC class
	34	+ * @dev: the device to register
	35	+ *
	36	+ * rtc_device_unregister() must be called when the class device is no
	37	+ * longer needed.
	38	+ *
	39	+ * Returns the pointer to the new struct class device.
	40	+ */
	41	+struct rtc_device rtc_device_register(const char name, struct device *dev,
	42	+ struct rtc_class_ops *ops,
	43	+ struct module *owner)
	44	+{
	45	+ struct rtc_device *rtc;
	46	+ int id, err;
	47	+
	48	+ if (idr_pre_get(&rtc_idr, GFP_KERNEL) == 0) {
	49	+ err = -ENOMEM;
	50	+ goto exit;
	51	+ }
	52	+
	53	+
	54	+ mutex_lock(&idr_lock);
	55	+ err = idr_get_new(&rtc_idr, NULL, &id);
	56	+ mutex_unlock(&idr_lock);
	57	+
	58	+ if (err < 0)
	59	+ goto exit;
	60	+
	61	+ id = id & MAX_ID_MASK;
	62	+
	63	+ rtc = kzalloc(sizeof(struct rtc_device), GFP_KERNEL);
	64	+ if (rtc == NULL) {
	65	+ err = -ENOMEM;
	66	+ goto exit_idr;
	67	+ }
	68	+
	69	+ rtc->id = id;
	70	+ rtc->ops = ops;
	71	+ rtc->owner = owner;
	72	+ rtc->class_dev.dev = dev;
	73	+ rtc->class_dev.class = rtc_class;
	74	+ rtc->class_dev.release = rtc_device_release;
	75	+
	76	+ mutex_init(&rtc->ops_lock);
	77	+ spin_lock_init(&rtc->irq_lock);
	78	+ spin_lock_init(&rtc->irq_task_lock);
	79	+
	80	+ strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE);
	81	+ snprintf(rtc->class_dev.class_id, BUS_ID_SIZE, "rtc%d", id);
	82	+
	83	+ err = class_device_register(&rtc->class_dev);
	84	+ if (err)
	85	+ goto exit_kfree;
	86	+
	87	+ dev_info(dev, "rtc core: registered %s as %s\n",
	88	+ rtc->name, rtc->class_dev.class_id);
	89	+
	90	+ return rtc;
	91	+
	92	+exit_kfree:
	93	+ kfree(rtc);
	94	+
	95	+exit_idr:
	96	+ idr_remove(&rtc_idr, id);
	97	+
	98	+exit:
	99	+ return ERR_PTR(err);
	100	+}
	101	+EXPORT_SYMBOL_GPL(rtc_device_register);
	102	+
	103	+
	104	+/**
	105	+ * rtc_device_unregister - removes the previously registered RTC class device
	106	+ *
	107	+ * @rtc: the RTC class device to destroy
	108	+ */
	109	+void rtc_device_unregister(struct rtc_device *rtc)
	110	+{
	111	+ mutex_lock(&rtc->ops_lock);
	112	+ rtc->ops = NULL;
	113	+ mutex_unlock(&rtc->ops_lock);
	114	+ class_device_unregister(&rtc->class_dev);
	115	+}
	116	+EXPORT_SYMBOL_GPL(rtc_device_unregister);
	117	+
	118	+int rtc_interface_register(struct class_interface *intf)
	119	+{
	120	+ intf->class = rtc_class;
	121	+ return class_interface_register(intf);
	122	+}
	123	+EXPORT_SYMBOL_GPL(rtc_interface_register);
	124	+
	125	+static int __init rtc_init(void)
	126	+{
	127	+ rtc_class = class_create(THIS_MODULE, "rtc");
	128	+ if (IS_ERR(rtc_class)) {
	129	+ printk(KERN_ERR "%s: couldn't create class\n", __FILE__);
	130	+ return PTR_ERR(rtc_class);
	131	+ }
	132	+ return 0;
	133	+}
	134	+
	135	+static void __exit rtc_exit(void)
	136	+{
	137	+ class_destroy(rtc_class);
	138	+}
	139	+
	140	+module_init(rtc_init);
	141	+module_exit(rtc_exit);
	142	+
	143	+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towerteh.it>");
	144	+MODULE_DESCRIPTION("RTC class support");
	145	+MODULE_LICENSE("GPL");
	1	+/*
	2	+ * RTC subsystem, initialize system time on startup
	3	+ *
	4	+ * Copyright (C) 2005 Tower Technologies
	5	+ * Author: Alessandro Zummo <a.zummo@towertech.it>
	6	+ *
	7	+ * This program is free software; you can redistribute it and/or modify
	8	+ * it under the terms of the GNU General Public License version 2 as
	9	+ * published by the Free Software Foundation.
	10	+*/
	11	+
	12	+#include <linux/rtc.h>
	13	+
	14	+/* IMPORTANT: the RTC only stores whole seconds. It is arbitrary
	15	+ * whether it stores the most close value or the value with partial
	16	+ * seconds truncated. However, it is important that we use it to store
	17	+ * the truncated value. This is because otherwise it is necessary,
	18	+ * in an rtc sync function, to read both xtime.tv_sec and
	19	+ * xtime.tv_nsec. On some processors (i.e. ARM), an atomic read
	20	+ * of >32bits is not possible. So storing the most close value would
	21	+ * slow down the sync API. So here we have the truncated value and
	22	+ * the best guess is to add 0.5s.
	23	+ */
	24	+
	25	+static int __init rtc_hctosys(void)
	26	+{
	27	+ int err;
	28	+ struct rtc_time tm;
	29	+ struct class_device *class_dev = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
	30	+
	31	+ if (class_dev == NULL) {
	32	+ printk("%s: unable to open rtc device (%s)\n",
	33	+ __FILE__, CONFIG_RTC_HCTOSYS_DEVICE);
	34	+ return -ENODEV;
	35	+ }
	36	+
	37	+ err = rtc_read_time(class_dev, &tm);
	38	+ if (err == 0) {
	39	+ err = rtc_valid_tm(&tm);
	40	+ if (err == 0) {
	41	+ struct timespec tv;
	42	+
	43	+ tv.tv_nsec = NSEC_PER_SEC >> 1;
	44	+
	45	+ rtc_tm_to_time(&tm, &tv.tv_sec);
	46	+
	47	+ do_settimeofday(&tv);
	48	+
	49	+ dev_info(class_dev->dev,
	50	+ "setting the system clock to "
	51	+ "%d-%02d-%02d %02d:%02d:%02d (%u)\n",
	52	+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
	53	+ tm.tm_hour, tm.tm_min, tm.tm_sec,
	54	+ (unsigned int) tv.tv_sec);
	55	+ }
	56	+ else
	57	+ dev_err(class_dev->dev,
	58	+ "hctosys: invalid date/time\n");
	59	+ }
	60	+ else
	61	+ dev_err(class_dev->dev,
	62	+ "hctosys: unable to read the hardware clock\n");
	63	+
	64	+ rtc_class_close(class_dev);
	65	+
	66	+ return 0;
	67	+}
	68	+
	69	+late_initcall(rtc_hctosys);
	1	+/*
	2	+ * RTC subsystem, interface functions
	3	+ *
	4	+ * Copyright (C) 2005 Tower Technologies
	5	+ * Author: Alessandro Zummo <a.zummo@towertech.it>
	6	+ *
	7	+ * based on arch/arm/common/rtctime.c
	8	+ *
	9	+ * This program is free software; you can redistribute it and/or modify
	10	+ * it under the terms of the GNU General Public License version 2 as
	11	+ * published by the Free Software Foundation.
	12	+*/
	13	+
	14	+#include <linux/rtc.h>
	15	+
	16	+int rtc_read_time(struct class_device class_dev, struct rtc_time tm)
	17	+{
	18	+ int err;
	19	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	20	+
	21	+ err = mutex_lock_interruptible(&rtc->ops_lock);
	22	+ if (err)
	23	+ return -EBUSY;
	24	+
	25	+ if (!rtc->ops)
	26	+ err = -ENODEV;
	27	+ else if (!rtc->ops->read_time)
	28	+ err = -EINVAL;
	29	+ else {
	30	+ memset(tm, 0, sizeof(struct rtc_time));
	31	+ err = rtc->ops->read_time(class_dev->dev, tm);
	32	+ }
	33	+
	34	+ mutex_unlock(&rtc->ops_lock);
	35	+ return err;
	36	+}
	37	+EXPORT_SYMBOL_GPL(rtc_read_time);
	38	+
	39	+int rtc_set_time(struct class_device class_dev, struct rtc_time tm)
	40	+{
	41	+ int err;
	42	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	43	+
	44	+ err = rtc_valid_tm(tm);
	45	+ if (err != 0)
	46	+ return err;
	47	+
	48	+ err = mutex_lock_interruptible(&rtc->ops_lock);
	49	+ if (err)
	50	+ return -EBUSY;
	51	+
	52	+ if (!rtc->ops)
	53	+ err = -ENODEV;
	54	+ else if (!rtc->ops->set_time)
	55	+ err = -EINVAL;
	56	+ else
	57	+ err = rtc->ops->set_time(class_dev->dev, tm);
	58	+
	59	+ mutex_unlock(&rtc->ops_lock);
	60	+ return err;
	61	+}
	62	+EXPORT_SYMBOL_GPL(rtc_set_time);
	63	+
	64	+int rtc_set_mmss(struct class_device *class_dev, unsigned long secs)
	65	+{
	66	+ int err;
	67	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	68	+
	69	+ err = mutex_lock_interruptible(&rtc->ops_lock);
	70	+ if (err)
	71	+ return -EBUSY;
	72	+
	73	+ if (!rtc->ops)
	74	+ err = -ENODEV;
	75	+ else if (rtc->ops->set_mmss)
	76	+ err = rtc->ops->set_mmss(class_dev->dev, secs);
	77	+ else if (rtc->ops->read_time && rtc->ops->set_time) {
	78	+ struct rtc_time new, old;
	79	+
	80	+ err = rtc->ops->read_time(class_dev->dev, &old);
	81	+ if (err == 0) {
	82	+ rtc_time_to_tm(secs, &new);
	83	+
	84	+ /*
	85	+ * avoid writing when we're going to change the day of
	86	+ * the month. We will retry in the next minute. This
	87	+ * basically means that if the RTC must not drift
	88	+ * by more than 1 minute in 11 minutes.
	89	+ */
	90	+ if (!((old.tm_hour == 23 && old.tm_min == 59) \|\|
	91	+ (new.tm_hour == 23 && new.tm_min == 59)))
	92	+ err = rtc->ops->set_time(class_dev->dev, &new);
	93	+ }
	94	+ }
	95	+ else
	96	+ err = -EINVAL;
	97	+
	98	+ mutex_unlock(&rtc->ops_lock);
	99	+
	100	+ return err;
	101	+}
	102	+EXPORT_SYMBOL_GPL(rtc_set_mmss);
	103	+
	104	+int rtc_read_alarm(struct class_device class_dev, struct rtc_wkalrm alarm)
	105	+{
	106	+ int err;
	107	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	108	+
	109	+ err = mutex_lock_interruptible(&rtc->ops_lock);
	110	+ if (err)
	111	+ return -EBUSY;
	112	+
	113	+ if (rtc->ops == NULL)
	114	+ err = -ENODEV;
	115	+ else if (!rtc->ops->read_alarm)
	116	+ err = -EINVAL;
	117	+ else {
	118	+ memset(alarm, 0, sizeof(struct rtc_wkalrm));
	119	+ err = rtc->ops->read_alarm(class_dev->dev, alarm);
	120	+ }
	121	+
	122	+ mutex_unlock(&rtc->ops_lock);
	123	+ return err;
	124	+}
	125	+EXPORT_SYMBOL_GPL(rtc_read_alarm);
	126	+
	127	+int rtc_set_alarm(struct class_device class_dev, struct rtc_wkalrm alarm)
	128	+{
	129	+ int err;
	130	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	131	+
	132	+ err = mutex_lock_interruptible(&rtc->ops_lock);
	133	+ if (err)
	134	+ return -EBUSY;
	135	+
	136	+ if (!rtc->ops)
	137	+ err = -ENODEV;
	138	+ else if (!rtc->ops->set_alarm)
	139	+ err = -EINVAL;
	140	+ else
	141	+ err = rtc->ops->set_alarm(class_dev->dev, alarm);
	142	+
	143	+ mutex_unlock(&rtc->ops_lock);
	144	+ return err;
	145	+}
	146	+EXPORT_SYMBOL_GPL(rtc_set_alarm);
	147	+
	148	+void rtc_update_irq(struct class_device *class_dev,
	149	+ unsigned long num, unsigned long events)
	150	+{
	151	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	152	+
	153	+ spin_lock(&rtc->irq_lock);
	154	+ rtc->irq_data = (rtc->irq_data + (num << 8)) \| events;
	155	+ spin_unlock(&rtc->irq_lock);
	156	+
	157	+ spin_lock(&rtc->irq_task_lock);
	158	+ if (rtc->irq_task)
	159	+ rtc->irq_task->func(rtc->irq_task->private_data);
	160	+ spin_unlock(&rtc->irq_task_lock);
	161	+
	162	+ wake_up_interruptible(&rtc->irq_queue);
	163	+ kill_fasync(&rtc->async_queue, SIGIO, POLL_IN);
	164	+}
	165	+EXPORT_SYMBOL_GPL(rtc_update_irq);
	166	+
	167	+struct class_device rtc_class_open(char name)
	168	+{
	169	+ struct class_device *class_dev = NULL,
	170	+ *class_dev_tmp;
	171	+
	172	+ down(&rtc_class->sem);
	173	+ list_for_each_entry(class_dev_tmp, &rtc_class->children, node) {
	174	+ if (strncmp(class_dev_tmp->class_id, name, BUS_ID_SIZE) == 0) {
	175	+ class_dev = class_dev_tmp;
	176	+ break;
	177	+ }
	178	+ }
	179	+
	180	+ if (class_dev) {
	181	+ if (!try_module_get(to_rtc_device(class_dev)->owner))
	182	+ class_dev = NULL;
	183	+ }
	184	+ up(&rtc_class->sem);
	185	+
	186	+ return class_dev;
	187	+}
	188	+EXPORT_SYMBOL_GPL(rtc_class_open);
	189	+
	190	+void rtc_class_close(struct class_device *class_dev)
	191	+{
	192	+ module_put(to_rtc_device(class_dev)->owner);
	193	+}
	194	+EXPORT_SYMBOL_GPL(rtc_class_close);
	195	+
	196	+int rtc_irq_register(struct class_device class_dev, struct rtc_task task)
	197	+{
	198	+ int retval = -EBUSY;
	199	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	200	+
	201	+ if (task == NULL \|\| task->func == NULL)
	202	+ return -EINVAL;
	203	+
	204	+ spin_lock(&rtc->irq_task_lock);
	205	+ if (rtc->irq_task == NULL) {
	206	+ rtc->irq_task = task;
	207	+ retval = 0;
	208	+ }
	209	+ spin_unlock(&rtc->irq_task_lock);
	210	+
	211	+ return retval;
	212	+}
	213	+EXPORT_SYMBOL_GPL(rtc_irq_register);
	214	+
	215	+void rtc_irq_unregister(struct class_device class_dev, struct rtc_task task)
	216	+{
	217	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	218	+
	219	+ spin_lock(&rtc->irq_task_lock);
	220	+ if (rtc->irq_task == task)
	221	+ rtc->irq_task = NULL;
	222	+ spin_unlock(&rtc->irq_task_lock);
	223	+}
	224	+EXPORT_SYMBOL_GPL(rtc_irq_unregister);
	225	+
	226	+int rtc_irq_set_state(struct class_device class_dev, struct rtc_task task, int enabled)
	227	+{
	228	+ int err = 0;
	229	+ unsigned long flags;
	230	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	231	+
	232	+ spin_lock_irqsave(&rtc->irq_task_lock, flags);
	233	+ if (rtc->irq_task != task)
	234	+ err = -ENXIO;
	235	+ spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
	236	+
	237	+ if (err == 0)
	238	+ err = rtc->ops->irq_set_state(class_dev->dev, enabled);
	239	+
	240	+ return err;
	241	+}
	242	+EXPORT_SYMBOL_GPL(rtc_irq_set_state);
	243	+
	244	+int rtc_irq_set_freq(struct class_device class_dev, struct rtc_task task, int freq)
	245	+{
	246	+ int err = 0, tmp = 0;
	247	+ unsigned long flags;
	248	+ struct rtc_device *rtc = to_rtc_device(class_dev);
	249	+
	250	+ /* allowed range is 2-8192 */
	251	+ if (freq < 2 \|\| freq > 8192)
	252	+ return -EINVAL;
	253	+/*
	254	+ FIXME: this does not belong here, will move where appropriate
	255	+ at a later stage. It cannot hurt right now, trust me :)
	256	+ if ((freq > rtc_max_user_freq) && (!capable(CAP_SYS_RESOURCE)))
	257	+ return -EACCES;
	258	+*/
	259	+ /* check if freq is a power of 2 */
	260	+ while (freq > (1 << tmp))
	261	+ tmp++;
	262	+
	263	+ if (freq != (1 << tmp))
	264	+ return -EINVAL;
	265	+
	266	+ spin_lock_irqsave(&rtc->irq_task_lock, flags);
	267	+ if (rtc->irq_task != task)
	268	+ err = -ENXIO;
	269	+ spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
	270	+
	271	+ if (err == 0) {
	272	+ err = rtc->ops->irq_set_freq(class_dev->dev, freq);
	273	+ if (err == 0)
	274	+ rtc->irq_freq = freq;
	275	+ }
	276	+ return err;
	277	+}
...	...	@@ -91,6 +91,12 @@
91	91	#define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */
92	92	#define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */
93	93
	94	+/* interrupt flags */
	95	+#define RTC_IRQF 0x80 /* any of the following is active */
	96	+#define RTC_PF 0x40
	97	+#define RTC_AF 0x20
	98	+#define RTC_UF 0x10
	99	+
94	100	#ifdef __KERNEL__
95	101
96	102	#include <linux/interrupt.h>
...	...	@@ -99,6 +105,87 @@
99	105	extern int rtc_valid_tm(struct rtc_time *tm);
100	106	extern int rtc_tm_to_time(struct rtc_time tm, unsigned long time);
101	107	extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
	108	+
	109	+#include <linux/device.h>
	110	+#include <linux/seq_file.h>
	111	+#include <linux/cdev.h>
	112	+#include <linux/poll.h>
	113	+#include <linux/mutex.h>
	114	+
	115	+extern struct class *rtc_class;
	116	+
	117	+struct rtc_class_ops {
	118	+ int (open)(struct device );
	119	+ void (release)(struct device );
	120	+ int (ioctl)(struct device , unsigned int, unsigned long);
	121	+ int (read_time)(struct device , struct rtc_time *);
	122	+ int (set_time)(struct device , struct rtc_time *);
	123	+ int (read_alarm)(struct device , struct rtc_wkalrm *);
	124	+ int (set_alarm)(struct device , struct rtc_wkalrm *);
	125	+ int (proc)(struct device , struct seq_file *);
	126	+ int (set_mmss)(struct device , unsigned long secs);
	127	+ int (irq_set_state)(struct device , int enabled);
	128	+ int (irq_set_freq)(struct device , int freq);
	129	+ int (read_callback)(struct device , int data);
	130	+};
	131	+
	132	+#define RTC_DEVICE_NAME_SIZE 20
	133	+struct rtc_task;
	134	+
	135	+struct rtc_device
	136	+{
	137	+ struct class_device class_dev;
	138	+ struct module *owner;
	139	+
	140	+ int id;
	141	+ char name[RTC_DEVICE_NAME_SIZE];
	142	+
	143	+ struct rtc_class_ops *ops;
	144	+ struct mutex ops_lock;
	145	+
	146	+ struct class_device *rtc_dev;
	147	+ struct cdev char_dev;
	148	+ struct mutex char_lock;
	149	+
	150	+ unsigned long irq_data;
	151	+ spinlock_t irq_lock;
	152	+ wait_queue_head_t irq_queue;
	153	+ struct fasync_struct *async_queue;
	154	+
	155	+ struct rtc_task *irq_task;
	156	+ spinlock_t irq_task_lock;
	157	+ int irq_freq;
	158	+};
	159	+#define to_rtc_device(d) container_of(d, struct rtc_device, class_dev)
	160	+
	161	+extern struct rtc_device rtc_device_register(const char name,
	162	+ struct device *dev,
	163	+ struct rtc_class_ops *ops,
	164	+ struct module *owner);
	165	+extern void rtc_device_unregister(struct rtc_device *rdev);
	166	+extern int rtc_interface_register(struct class_interface *intf);
	167	+
	168	+extern int rtc_read_time(struct class_device class_dev, struct rtc_time tm);
	169	+extern int rtc_set_time(struct class_device class_dev, struct rtc_time tm);
	170	+extern int rtc_set_mmss(struct class_device *class_dev, unsigned long secs);
	171	+extern int rtc_read_alarm(struct class_device *class_dev,
	172	+ struct rtc_wkalrm *alrm);
	173	+extern int rtc_set_alarm(struct class_device *class_dev,
	174	+ struct rtc_wkalrm *alrm);
	175	+extern void rtc_update_irq(struct class_device *class_dev,
	176	+ unsigned long num, unsigned long events);
	177	+
	178	+extern struct class_device rtc_class_open(char name);
	179	+extern void rtc_class_close(struct class_device *class_dev);
	180	+
	181	+extern int rtc_irq_register(struct class_device *class_dev,
	182	+ struct rtc_task *task);
	183	+extern void rtc_irq_unregister(struct class_device *class_dev,
	184	+ struct rtc_task *task);
	185	+extern int rtc_irq_set_state(struct class_device *class_dev,
	186	+ struct rtc_task *task, int enabled);
	187	+extern int rtc_irq_set_freq(struct class_device *class_dev,
	188	+ struct rtc_task *task, int freq);
102	189
103	190	typedef struct rtc_task {
104	191	void (func)(void private_data);