2 * Generic RTC interface.
3 * This version contains the part of the user interface to the Real Time Clock
4 * service. It is used with both the legacy mc146818 and also EFI
5 * Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
6 * from <linux/mc146818rtc.h> to this file for 2.4 kernels.
8 * Copyright (C) 1999 Hewlett-Packard Co.
15 #include <linux/types.h>
16 #include <linux/interrupt.h>
17 #include <uapi/linux/rtc.h>
19 extern int rtc_month_days(unsigned int month, unsigned int year);
20 extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
21 extern int rtc_valid_tm(struct rtc_time *tm);
22 extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
23 extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
24 ktime_t rtc_tm_to_ktime(struct rtc_time tm);
25 struct rtc_time rtc_ktime_to_tm(ktime_t kt);
28 * Deprecated. Use rtc_time64_to_tm().
30 static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
32 rtc_time64_to_tm(time, tm);
36 * Deprecated. Use rtc_tm_to_time64().
38 static inline int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
40 *time = rtc_tm_to_time64(tm);
45 #include <linux/device.h>
46 #include <linux/seq_file.h>
47 #include <linux/cdev.h>
48 #include <linux/poll.h>
49 #include <linux/mutex.h>
50 #include <linux/timerqueue.h>
51 #include <linux/workqueue.h>
53 extern struct class *rtc_class;
56 * For these RTC methods the device parameter is the physical device
57 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
58 * was passed to rtc_device_register(). Its driver_data normally holds
59 * device state, including the rtc_device pointer for the RTC.
61 * Most of these methods are called with rtc_device.ops_lock held,
62 * through the rtc_*(struct rtc_device *, ...) calls.
64 * The (current) exceptions are mostly filesystem hooks:
65 * - the proc() hook for procfs
66 * - non-ioctl() chardev hooks: open(), release(), read_callback()
68 * REVISIT those periodic irq calls *do* have ops_lock when they're
69 * issued through ioctl() ...
71 struct rtc_class_ops {
72 int (*open)(struct device *);
73 void (*release)(struct device *);
74 int (*ioctl)(struct device *, unsigned int, unsigned long);
75 int (*read_time)(struct device *, struct rtc_time *);
76 int (*set_time)(struct device *, struct rtc_time *);
77 int (*read_alarm)(struct device *, struct rtc_wkalrm *);
78 int (*set_alarm)(struct device *, struct rtc_wkalrm *);
79 int (*proc)(struct device *, struct seq_file *);
80 int (*set_mmss64)(struct device *, time64_t secs);
81 int (*set_mmss)(struct device *, unsigned long secs);
82 int (*read_callback)(struct device *, int data);
83 int (*alarm_irq_enable)(struct device *, unsigned int enabled);
86 #define RTC_DEVICE_NAME_SIZE 20
87 typedef struct rtc_task {
88 void (*func)(void *private_data);
95 struct timerqueue_node node;
102 #define RTC_DEV_BUSY 0
107 struct module *owner;
110 char name[RTC_DEVICE_NAME_SIZE];
112 const struct rtc_class_ops *ops;
113 struct mutex ops_lock;
115 struct cdev char_dev;
118 unsigned long irq_data;
120 wait_queue_head_t irq_queue;
121 struct fasync_struct *async_queue;
123 struct rtc_task *irq_task;
124 spinlock_t irq_task_lock;
128 struct timerqueue_head timerqueue;
129 struct rtc_timer aie_timer;
130 struct rtc_timer uie_rtctimer;
131 struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
133 struct work_struct irqwork;
134 /* Some hardware can't support UIE mode */
137 #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
138 struct work_struct uie_task;
139 struct timer_list uie_timer;
140 /* Those fields are protected by rtc->irq_lock */
141 unsigned int oldsecs;
142 unsigned int uie_irq_active:1;
143 unsigned int stop_uie_polling:1;
144 unsigned int uie_task_active:1;
145 unsigned int uie_timer_active:1;
148 #define to_rtc_device(d) container_of(d, struct rtc_device, dev)
150 extern struct rtc_device *rtc_device_register(const char *name,
152 const struct rtc_class_ops *ops,
153 struct module *owner);
154 extern struct rtc_device *devm_rtc_device_register(struct device *dev,
156 const struct rtc_class_ops *ops,
157 struct module *owner);
158 extern void rtc_device_unregister(struct rtc_device *rtc);
159 extern void devm_rtc_device_unregister(struct device *dev,
160 struct rtc_device *rtc);
162 extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
163 extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
164 extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
165 extern int rtc_set_ntp_time(struct timespec64 now);
166 int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
167 extern int rtc_read_alarm(struct rtc_device *rtc,
168 struct rtc_wkalrm *alrm);
169 extern int rtc_set_alarm(struct rtc_device *rtc,
170 struct rtc_wkalrm *alrm);
171 extern int rtc_initialize_alarm(struct rtc_device *rtc,
172 struct rtc_wkalrm *alrm);
173 extern void rtc_update_irq(struct rtc_device *rtc,
174 unsigned long num, unsigned long events);
176 extern struct rtc_device *rtc_class_open(const char *name);
177 extern void rtc_class_close(struct rtc_device *rtc);
179 extern int rtc_irq_register(struct rtc_device *rtc,
180 struct rtc_task *task);
181 extern void rtc_irq_unregister(struct rtc_device *rtc,
182 struct rtc_task *task);
183 extern int rtc_irq_set_state(struct rtc_device *rtc,
184 struct rtc_task *task, int enabled);
185 extern int rtc_irq_set_freq(struct rtc_device *rtc,
186 struct rtc_task *task, int freq);
187 extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
188 extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
189 extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
190 unsigned int enabled);
192 void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
193 void rtc_aie_update_irq(void *private);
194 void rtc_uie_update_irq(void *private);
195 enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
197 int rtc_register(rtc_task_t *task);
198 int rtc_unregister(rtc_task_t *task);
199 int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
201 void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data);
202 int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer,
203 ktime_t expires, ktime_t period);
204 int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer);
205 void rtc_timer_do_work(struct work_struct *work);
207 static inline bool is_leap_year(unsigned int year)
209 return (!(year % 4) && (year % 100)) || !(year % 400);
212 #ifdef CONFIG_RTC_HCTOSYS_DEVICE
213 extern int rtc_hctosys_ret;
215 #define rtc_hctosys_ret -ENODEV
218 #endif /* _LINUX_RTC_H_ */