Initial import

1 files changed, 218 insertions, 0 deletions

diff --git a/include/linux/rtc.h b/include/linux/rtc.h
new file mode 100644
index 000000000..8dcf6825f
--- /dev/null
+++ b/include/linux/rtc.h
@@ -0,0 +1,218 @@
+/*
+ * Generic RTC interface.
+ * This version contains the part of the user interface to the Real Time Clock
+ * service. It is used with both the legacy mc146818 and also  EFI
+ * Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
+ * from <linux/mc146818rtc.h> to this file for 2.4 kernels.
+ *
+ * Copyright (C) 1999 Hewlett-Packard Co.
+ * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
+ */
+#ifndef _LINUX_RTC_H_
+#define _LINUX_RTC_H_
+
+
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <uapi/linux/rtc.h>
+
+extern int rtc_month_days(unsigned int month, unsigned int year);
+extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
+extern int rtc_valid_tm(struct rtc_time *tm);
+extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
+extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
+ktime_t rtc_tm_to_ktime(struct rtc_time tm);
+struct rtc_time rtc_ktime_to_tm(ktime_t kt);
+
+/**
+ * Deprecated. Use rtc_time64_to_tm().
+ */
+static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
+{
+	rtc_time64_to_tm(time, tm);
+}
+
+/**
+ * Deprecated. Use rtc_tm_to_time64().
+ */
+static inline int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
+{
+	*time = rtc_tm_to_time64(tm);
+
+	return 0;
+}
+
+#include <linux/device.h>
+#include <linux/seq_file.h>
+#include <linux/cdev.h>
+#include <linux/poll.h>
+#include <linux/mutex.h>
+#include <linux/timerqueue.h>
+#include <linux/workqueue.h>
+
+extern struct class *rtc_class;
+
+/*
+ * For these RTC methods the device parameter is the physical device
+ * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
+ * was passed to rtc_device_register().  Its driver_data normally holds
+ * device state, including the rtc_device pointer for the RTC.
+ *
+ * Most of these methods are called with rtc_device.ops_lock held,
+ * through the rtc_*(struct rtc_device *, ...) calls.
+ *
+ * The (current) exceptions are mostly filesystem hooks:
+ *   - the proc() hook for procfs
+ *   - non-ioctl() chardev hooks:  open(), release(), read_callback()
+ *
+ * REVISIT those periodic irq calls *do* have ops_lock when they're
+ * issued through ioctl() ...
+ */
+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_mmss64)(struct device *, time64_t secs);
+	int (*set_mmss)(struct device *, unsigned long secs);
+	int (*read_callback)(struct device *, int data);
+	int (*alarm_irq_enable)(struct device *, unsigned int enabled);
+};
+
+#define RTC_DEVICE_NAME_SIZE 20
+typedef struct rtc_task {
+	void (*func)(void *private_data);
+	void *private_data;
+} rtc_task_t;
+
+
+struct rtc_timer {
+	struct rtc_task	task;
+	struct timerqueue_node node;
+	ktime_t period;
+	int enabled;
+};
+
+
+/* flags */
+#define RTC_DEV_BUSY 0
+
+struct rtc_device
+{
+	struct device dev;
+	struct module *owner;
+
+	int id;
+	char name[RTC_DEVICE_NAME_SIZE];
+
+	const struct rtc_class_ops *ops;
+	struct mutex ops_lock;
+
+	struct cdev char_dev;
+	unsigned long flags;
+
+	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;
+	int max_user_freq;
+
+	struct timerqueue_head timerqueue;
+	struct rtc_timer aie_timer;
+	struct rtc_timer uie_rtctimer;
+	struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
+	int pie_enabled;
+	struct work_struct irqwork;
+	/* Some hardware can't support UIE mode */
+	int uie_unsupported;
+
+#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
+	struct work_struct uie_task;
+	struct timer_list uie_timer;
+	/* Those fields are protected by rtc->irq_lock */
+	unsigned int oldsecs;
+	unsigned int uie_irq_active:1;
+	unsigned int stop_uie_polling:1;
+	unsigned int uie_task_active:1;
+	unsigned int uie_timer_active:1;
+#endif
+};
+#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
+
+extern struct rtc_device *rtc_device_register(const char *name,
+					struct device *dev,
+					const struct rtc_class_ops *ops,
+					struct module *owner);
+extern struct rtc_device *devm_rtc_device_register(struct device *dev,
+					const char *name,
+					const struct rtc_class_ops *ops,
+					struct module *owner);
+extern void rtc_device_unregister(struct rtc_device *rtc);
+extern void devm_rtc_device_unregister(struct device *dev,
+					struct rtc_device *rtc);
+
+extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
+extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
+extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
+extern int rtc_set_ntp_time(struct timespec64 now);
+int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
+extern int rtc_read_alarm(struct rtc_device *rtc,
+			struct rtc_wkalrm *alrm);
+extern int rtc_set_alarm(struct rtc_device *rtc,
+				struct rtc_wkalrm *alrm);
+extern int rtc_initialize_alarm(struct rtc_device *rtc,
+				struct rtc_wkalrm *alrm);
+extern void rtc_update_irq(struct rtc_device *rtc,
+			unsigned long num, unsigned long events);
+
+extern struct rtc_device *rtc_class_open(const char *name);
+extern void rtc_class_close(struct rtc_device *rtc);
+
+extern int rtc_irq_register(struct rtc_device *rtc,
+				struct rtc_task *task);
+extern void rtc_irq_unregister(struct rtc_device *rtc,
+				struct rtc_task *task);
+extern int rtc_irq_set_state(struct rtc_device *rtc,
+				struct rtc_task *task, int enabled);
+extern int rtc_irq_set_freq(struct rtc_device *rtc,
+				struct rtc_task *task, int freq);
+extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
+extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
+extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
+						unsigned int enabled);
+
+void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
+void rtc_aie_update_irq(void *private);
+void rtc_uie_update_irq(void *private);
+enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
+
+int rtc_register(rtc_task_t *task);
+int rtc_unregister(rtc_task_t *task);
+int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
+
+void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data);
+int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer,
+			ktime_t expires, ktime_t period);
+int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer);
+void rtc_timer_do_work(struct work_struct *work);
+
+static inline bool is_leap_year(unsigned int year)
+{
+	return (!(year % 4) && (year % 100)) || !(year % 400);
+}
+
+#ifdef CONFIG_RTC_HCTOSYS_DEVICE
+extern int rtc_hctosys_ret;
+#else
+#define rtc_hctosys_ret -ENODEV
+#endif
+
+#endif /* _LINUX_RTC_H_ */