263 lines
8.7 KiB
C
263 lines
8.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Generic RTC interface.
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* This version contains the part of the user interface to the Real Time Clock
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* service. It is used with both the legacy mc146818 and also EFI
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* Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
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* from <linux/mc146818rtc.h> to this file for 2.4 kernels.
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*
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* Copyright (C) 1999 Hewlett-Packard Co.
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* Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
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*/
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#ifndef _LINUX_RTC_H_
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#define _LINUX_RTC_H_
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/nvmem-provider.h>
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#include <uapi/linux/rtc.h>
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extern int rtc_month_days(unsigned int month, unsigned int year);
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extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
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extern int rtc_valid_tm(struct rtc_time *tm);
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extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
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extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
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ktime_t rtc_tm_to_ktime(struct rtc_time tm);
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struct rtc_time rtc_ktime_to_tm(ktime_t kt);
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/*
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* rtc_tm_sub - Return the difference in seconds.
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*/
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static inline time64_t rtc_tm_sub(struct rtc_time *lhs, struct rtc_time *rhs)
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{
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return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
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}
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#include <linux/device.h>
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#include <linux/seq_file.h>
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#include <linux/cdev.h>
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#include <linux/poll.h>
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#include <linux/mutex.h>
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#include <linux/timerqueue.h>
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#include <linux/workqueue.h>
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extern struct class *rtc_class;
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/*
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* For these RTC methods the device parameter is the physical device
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* on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
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* was passed to rtc_device_register(). Its driver_data normally holds
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* device state, including the rtc_device pointer for the RTC.
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*
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* Most of these methods are called with rtc_device.ops_lock held,
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* through the rtc_*(struct rtc_device *, ...) calls.
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*
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* The (current) exceptions are mostly filesystem hooks:
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* - the proc() hook for procfs
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*/
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struct rtc_class_ops {
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int (*ioctl)(struct device *, unsigned int, unsigned long);
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int (*read_time)(struct device *, struct rtc_time *);
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int (*set_time)(struct device *, struct rtc_time *);
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int (*read_alarm)(struct device *, struct rtc_wkalrm *);
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int (*set_alarm)(struct device *, struct rtc_wkalrm *);
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int (*proc)(struct device *, struct seq_file *);
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int (*alarm_irq_enable)(struct device *, unsigned int enabled);
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int (*read_offset)(struct device *, long *offset);
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int (*set_offset)(struct device *, long offset);
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};
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struct rtc_device;
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struct rtc_timer {
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struct timerqueue_node node;
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ktime_t period;
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void (*func)(struct rtc_device *rtc);
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struct rtc_device *rtc;
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int enabled;
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};
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/* flags */
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#define RTC_DEV_BUSY 0
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struct rtc_device {
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struct device dev;
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struct module *owner;
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int id;
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const struct rtc_class_ops *ops;
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struct mutex ops_lock;
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struct cdev char_dev;
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unsigned long flags;
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unsigned long irq_data;
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spinlock_t irq_lock;
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wait_queue_head_t irq_queue;
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struct fasync_struct *async_queue;
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int irq_freq;
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int max_user_freq;
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struct timerqueue_head timerqueue;
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struct rtc_timer aie_timer;
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struct rtc_timer uie_rtctimer;
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struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
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int pie_enabled;
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struct work_struct irqwork;
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/* Some hardware can't support UIE mode */
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int uie_unsupported;
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/*
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* This offset specifies the update timing of the RTC.
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*
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* tsched t1 write(t2.tv_sec - 1sec)) t2 RTC increments seconds
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*
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* The offset defines how tsched is computed so that the write to
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* the RTC (t2.tv_sec - 1sec) is correct versus the time required
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* for the transport of the write and the time which the RTC needs
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* to increment seconds the first time after the write (t2).
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*
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* For direct accessible RTCs tsched ~= t1 because the write time
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* is negligible. For RTCs behind slow busses the transport time is
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* significant and has to be taken into account.
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*
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* The time between the write (t1) and the first increment after
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* the write (t2) is RTC specific. For a MC146818 RTC it's 500ms,
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* for many others it's exactly 1 second. Consult the datasheet.
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*
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* The value of this offset is also used to calculate the to be
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* written value (t2.tv_sec - 1sec) at tsched.
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*
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* The default value for this is NSEC_PER_SEC + 10 msec default
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* transport time. The offset can be adjusted by drivers so the
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* calculation for the to be written value at tsched becomes
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* correct:
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*
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* newval = tsched + set_offset_nsec - NSEC_PER_SEC
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* and (tsched + set_offset_nsec) % NSEC_PER_SEC == 0
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*/
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unsigned long set_offset_nsec;
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unsigned long features[BITS_TO_LONGS(RTC_FEATURE_CNT)];
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time64_t range_min;
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timeu64_t range_max;
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time64_t start_secs;
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time64_t offset_secs;
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bool set_start_time;
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#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
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struct work_struct uie_task;
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struct timer_list uie_timer;
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/* Those fields are protected by rtc->irq_lock */
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unsigned int oldsecs;
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unsigned int uie_irq_active:1;
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unsigned int stop_uie_polling:1;
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unsigned int uie_task_active:1;
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unsigned int uie_timer_active:1;
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#endif
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};
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#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
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#define rtc_lock(d) mutex_lock(&d->ops_lock)
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#define rtc_unlock(d) mutex_unlock(&d->ops_lock)
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/* useful timestamps */
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#define RTC_TIMESTAMP_BEGIN_0000 -62167219200ULL /* 0000-01-01 00:00:00 */
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#define RTC_TIMESTAMP_BEGIN_1900 -2208988800LL /* 1900-01-01 00:00:00 */
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#define RTC_TIMESTAMP_BEGIN_2000 946684800LL /* 2000-01-01 00:00:00 */
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#define RTC_TIMESTAMP_END_2063 2966371199LL /* 2063-12-31 23:59:59 */
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#define RTC_TIMESTAMP_END_2079 3471292799LL /* 2079-12-31 23:59:59 */
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#define RTC_TIMESTAMP_END_2099 4102444799LL /* 2099-12-31 23:59:59 */
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#define RTC_TIMESTAMP_END_2199 7258118399LL /* 2199-12-31 23:59:59 */
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#define RTC_TIMESTAMP_END_9999 253402300799LL /* 9999-12-31 23:59:59 */
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extern struct rtc_device *devm_rtc_device_register(struct device *dev,
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const char *name,
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const struct rtc_class_ops *ops,
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struct module *owner);
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struct rtc_device *devm_rtc_allocate_device(struct device *dev);
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int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc);
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extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
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extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
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int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
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extern int rtc_read_alarm(struct rtc_device *rtc,
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struct rtc_wkalrm *alrm);
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extern int rtc_set_alarm(struct rtc_device *rtc,
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struct rtc_wkalrm *alrm);
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extern int rtc_initialize_alarm(struct rtc_device *rtc,
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struct rtc_wkalrm *alrm);
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extern void rtc_update_irq(struct rtc_device *rtc,
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unsigned long num, unsigned long events);
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extern struct rtc_device *rtc_class_open(const char *name);
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extern void rtc_class_close(struct rtc_device *rtc);
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extern int rtc_irq_set_state(struct rtc_device *rtc, int enabled);
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extern int rtc_irq_set_freq(struct rtc_device *rtc, int freq);
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extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
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extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
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extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
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unsigned int enabled);
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void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
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void rtc_aie_update_irq(struct rtc_device *rtc);
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void rtc_uie_update_irq(struct rtc_device *rtc);
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enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
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void rtc_timer_init(struct rtc_timer *timer, void (*f)(struct rtc_device *r),
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struct rtc_device *rtc);
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int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,
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ktime_t expires, ktime_t period);
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void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer);
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int rtc_read_offset(struct rtc_device *rtc, long *offset);
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int rtc_set_offset(struct rtc_device *rtc, long offset);
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void rtc_timer_do_work(struct work_struct *work);
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static inline bool is_leap_year(unsigned int year)
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{
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return (!(year % 4) && (year % 100)) || !(year % 400);
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}
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#define devm_rtc_register_device(device) \
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__devm_rtc_register_device(THIS_MODULE, device)
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#ifdef CONFIG_RTC_HCTOSYS_DEVICE
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extern int rtc_hctosys_ret;
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#else
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#define rtc_hctosys_ret -ENODEV
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#endif
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#ifdef CONFIG_RTC_NVMEM
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int devm_rtc_nvmem_register(struct rtc_device *rtc,
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struct nvmem_config *nvmem_config);
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#else
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static inline int devm_rtc_nvmem_register(struct rtc_device *rtc,
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struct nvmem_config *nvmem_config)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_RTC_INTF_SYSFS
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int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp);
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int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps);
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#else
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static inline
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int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
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{
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return 0;
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}
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static inline
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int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
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{
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return 0;
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}
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#endif
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#endif /* _LINUX_RTC_H_ */
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