include/linux/rtc.h

   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
  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 int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
  23 extern void rtc_time_to_tm(unsigned long 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);
  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
  36 extern 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  */
  54 struct 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
  69 typedef struct rtc_task {
  70         void (*func)(void *private_data);
  71         void *private_data;
  72 } rtc_task_t;
  73
  74
  75 struct 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
  86 struct 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
 132 extern struct rtc_device *rtc_device_register(const char *name,
 133                                         struct device *dev,
 134                                         const struct rtc_class_ops *ops,
 135                                         struct module *owner);
 136 extern struct rtc_device *devm_rtc_device_register(struct device *dev,
 137                                         const char *name,
 138                                         const struct rtc_class_ops *ops,
 139                                         struct module *owner);
 140 extern void rtc_device_unregister(struct rtc_device *rtc);
 141 extern void devm_rtc_device_unregister(struct device *dev,
 142                                         struct rtc_device *rtc);
 143
 144 extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
 145 extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
 146 extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
 147 extern int rtc_set_ntp_time(struct timespec now);
 148 int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
 149 extern int rtc_read_alarm(struct rtc_device *rtc,
 150                         struct rtc_wkalrm *alrm);
 151 extern int rtc_set_alarm(struct rtc_device *rtc,
 152                                 struct rtc_wkalrm *alrm);
 153 extern int rtc_initialize_alarm(struct rtc_device *rtc,
 154                                 struct rtc_wkalrm *alrm);
 155 extern void rtc_update_irq(struct rtc_device *rtc,
 156                         unsigned long num, unsigned long events);
 157
 158 extern struct rtc_device *rtc_class_open(const char *name);
 159 extern void rtc_class_close(struct rtc_device *rtc);
 160
 161 extern int rtc_irq_register(struct rtc_device *rtc,
 162                                 struct rtc_task *task);
 163 extern void rtc_irq_unregister(struct rtc_device *rtc,
 164                                 struct rtc_task *task);
 165 extern int rtc_irq_set_state(struct rtc_device *rtc,
 166                                 struct rtc_task *task, int enabled);
 167 extern int rtc_irq_set_freq(struct rtc_device *rtc,
 168                                 struct rtc_task *task, int freq);
 169 extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 170 extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 171 extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
 172                                                 unsigned int enabled);
 173
 174 void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
 175 void rtc_aie_update_irq(void *private);
 176 void rtc_uie_update_irq(void *private);
 177 enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
 178
 179 int rtc_register(rtc_task_t *task);
 180 int rtc_unregister(rtc_task_t *task);
 181 int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
 182
 183 void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data);
 184 int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer,
 185                         ktime_t expires, ktime_t period);
 186 int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer);
 187 void rtc_timer_do_work(struct work_struct *work);
 188
 189 static inline bool is_leap_year(unsigned int year)
 190 {
 191         return (!(year % 4) && (year % 100)) || !(year % 400);
 192 }
 193
 194 #ifdef CONFIG_RTC_HCTOSYS_DEVICE
 195 extern int rtc_hctosys_ret;
 196 #else
 197 #define rtc_hctosys_ret -ENODEV
 198 #endif
 199
 200 #endif /* _LINUX_RTC_H_ */