linux/include/linux/rtc.h
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   1/*
   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.
   7 *
   8 * Copyright (C) 1999 Hewlett-Packard Co.
   9 * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
  10 */
  11#ifndef _LINUX_RTC_H_
  12#define _LINUX_RTC_H_
  13
  14
  15#include <linux/types.h>
  16#include <linux/interrupt.h>
  17#include <uapi/linux/rtc.h>
  18
  19extern int rtc_month_days(unsigned int month, unsigned int year);
  20extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
  21extern int rtc_valid_tm(struct rtc_time *tm);
  22extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
  23extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
  24ktime_t rtc_tm_to_ktime(struct rtc_time tm);
  25struct rtc_time rtc_ktime_to_tm(ktime_t kt);
  26
  27
  28#include <linux/device.h>
  29#include <linux/seq_file.h>
  30#include <linux/cdev.h>
  31#include <linux/poll.h>
  32#include <linux/mutex.h>
  33#include <linux/timerqueue.h>
  34#include <linux/workqueue.h>
  35
  36extern struct class *rtc_class;
  37
  38/*
  39 * For these RTC methods the device parameter is the physical device
  40 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
  41 * was passed to rtc_device_register().  Its driver_data normally holds
  42 * device state, including the rtc_device pointer for the RTC.
  43 *
  44 * Most of these methods are called with rtc_device.ops_lock held,
  45 * through the rtc_*(struct rtc_device *, ...) calls.
  46 *
  47 * The (current) exceptions are mostly filesystem hooks:
  48 *   - the proc() hook for procfs
  49 *   - non-ioctl() chardev hooks:  open(), release(), read_callback()
  50 *
  51 * REVISIT those periodic irq calls *do* have ops_lock when they're
  52 * issued through ioctl() ...
  53 */
  54struct rtc_class_ops {
  55        int (*open)(struct device *);
  56        void (*release)(struct device *);
  57        int (*ioctl)(struct device *, unsigned int, unsigned long);
  58        int (*read_time)(struct device *, struct rtc_time *);
  59        int (*set_time)(struct device *, struct rtc_time *);
  60        int (*read_alarm)(struct device *, struct rtc_wkalrm *);
  61        int (*set_alarm)(struct device *, struct rtc_wkalrm *);
  62        int (*proc)(struct device *, struct seq_file *);
  63        int (*set_mmss)(struct device *, unsigned long secs);
  64        int (*read_callback)(struct device *, int data);
  65        int (*alarm_irq_enable)(struct device *, unsigned int enabled);
  66};
  67
  68#define RTC_DEVICE_NAME_SIZE 20
  69typedef struct rtc_task {
  70        void (*func)(void *private_data);
  71        void *private_data;
  72} rtc_task_t;
  73
  74
  75struct rtc_timer {
  76        struct rtc_task task;
  77        struct timerqueue_node node;
  78        ktime_t period;
  79        int enabled;
  80};
  81
  82
  83/* flags */
  84#define RTC_DEV_BUSY 0
  85
  86struct rtc_device
  87{
  88        struct device dev;
  89        struct module *owner;
  90
  91        int id;
  92        char name[RTC_DEVICE_NAME_SIZE];
  93
  94        const struct rtc_class_ops *ops;
  95        struct mutex ops_lock;
  96
  97        struct cdev char_dev;
  98        unsigned long flags;
  99
 100        unsigned long irq_data;
 101        spinlock_t irq_lock;
 102        wait_queue_head_t irq_queue;
 103        struct fasync_struct *async_queue;
 104
 105        struct rtc_task *irq_task;
 106        spinlock_t irq_task_lock;
 107        int irq_freq;
 108        int max_user_freq;
 109
 110        struct timerqueue_head timerqueue;
 111        struct rtc_timer aie_timer;
 112        struct rtc_timer uie_rtctimer;
 113        struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
 114        int pie_enabled;
 115        struct work_struct irqwork;
 116        /* Some hardware can't support UIE mode */
 117        int uie_unsupported;
 118
 119#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
 120        struct work_struct uie_task;
 121        struct timer_list uie_timer;
 122        /* Those fields are protected by rtc->irq_lock */
 123        unsigned int oldsecs;
 124        unsigned int uie_irq_active:1;
 125        unsigned int stop_uie_polling:1;
 126        unsigned int uie_task_active:1;
 127        unsigned int uie_timer_active:1;
 128#endif
 129};
 130#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
 131
 132extern struct rtc_device *rtc_device_register(const char *name,
 133                                        struct device *dev,
 134                                        const struct rtc_class_ops *ops,
 135                                        struct module *owner);
 136extern void rtc_device_unregister(struct rtc_device *rtc);
 137
 138extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
 139extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
 140extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
 141int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
 142extern int rtc_read_alarm(struct rtc_device *rtc,
 143                        struct rtc_wkalrm *alrm);
 144extern int rtc_set_alarm(struct rtc_device *rtc,
 145                                struct rtc_wkalrm *alrm);
 146extern int rtc_initialize_alarm(struct rtc_device *rtc,
 147                                struct rtc_wkalrm *alrm);
 148extern void rtc_update_irq(struct rtc_device *rtc,
 149                        unsigned long num, unsigned long events);
 150
 151extern struct rtc_device *rtc_class_open(char *name);
 152extern void rtc_class_close(struct rtc_device *rtc);
 153
 154extern int rtc_irq_register(struct rtc_device *rtc,
 155                                struct rtc_task *task);
 156extern void rtc_irq_unregister(struct rtc_device *rtc,
 157                                struct rtc_task *task);
 158extern int rtc_irq_set_state(struct rtc_device *rtc,
 159                                struct rtc_task *task, int enabled);
 160extern int rtc_irq_set_freq(struct rtc_device *rtc,
 161                                struct rtc_task *task, int freq);
 162extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 163extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 164extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
 165                                                unsigned int enabled);
 166
 167void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
 168void rtc_aie_update_irq(void *private);
 169void rtc_uie_update_irq(void *private);
 170enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
 171
 172int rtc_register(rtc_task_t *task);
 173int rtc_unregister(rtc_task_t *task);
 174int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
 175
 176void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data);
 177int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer,
 178                        ktime_t expires, ktime_t period);
 179int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer);
 180void rtc_timer_do_work(struct work_struct *work);
 181
 182static inline bool is_leap_year(unsigned int year)
 183{
 184        return (!(year % 4) && (year % 100)) || !(year % 400);
 185}
 186
 187#ifdef CONFIG_RTC_HCTOSYS_DEVICE
 188extern int rtc_hctosys_ret;
 189#else
 190#define rtc_hctosys_ret -ENODEV
 191#endif
 192
 193#endif /* _LINUX_RTC_H_ */
 194
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