261 строка
8.6 KiB
C
261 строка
8.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* 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 <linux/nvmem-provider.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);
|
|
|
|
/*
|
|
* rtc_tm_sub - Return the difference in seconds.
|
|
*/
|
|
static inline time64_t rtc_tm_sub(struct rtc_time *lhs, struct rtc_time *rhs)
|
|
{
|
|
return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
|
|
}
|
|
|
|
#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
|
|
*/
|
|
struct rtc_class_ops {
|
|
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 (*alarm_irq_enable)(struct device *, unsigned int enabled);
|
|
int (*read_offset)(struct device *, long *offset);
|
|
int (*set_offset)(struct device *, long offset);
|
|
};
|
|
|
|
struct rtc_device;
|
|
|
|
struct rtc_timer {
|
|
struct timerqueue_node node;
|
|
ktime_t period;
|
|
void (*func)(struct rtc_device *rtc);
|
|
struct rtc_device *rtc;
|
|
int enabled;
|
|
};
|
|
|
|
/* flags */
|
|
#define RTC_DEV_BUSY 0
|
|
|
|
struct rtc_device {
|
|
struct device dev;
|
|
struct module *owner;
|
|
|
|
int id;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
/*
|
|
* This offset specifies the update timing of the RTC.
|
|
*
|
|
* tsched t1 write(t2.tv_sec - 1sec)) t2 RTC increments seconds
|
|
*
|
|
* The offset defines how tsched is computed so that the write to
|
|
* the RTC (t2.tv_sec - 1sec) is correct versus the time required
|
|
* for the transport of the write and the time which the RTC needs
|
|
* to increment seconds the first time after the write (t2).
|
|
*
|
|
* For direct accessible RTCs tsched ~= t1 because the write time
|
|
* is negligible. For RTCs behind slow busses the transport time is
|
|
* significant and has to be taken into account.
|
|
*
|
|
* The time between the write (t1) and the first increment after
|
|
* the write (t2) is RTC specific. For a MC146818 RTC it's 500ms,
|
|
* for many others it's exactly 1 second. Consult the datasheet.
|
|
*
|
|
* The value of this offset is also used to calculate the to be
|
|
* written value (t2.tv_sec - 1sec) at tsched.
|
|
*
|
|
* The default value for this is NSEC_PER_SEC + 10 msec default
|
|
* transport time. The offset can be adjusted by drivers so the
|
|
* calculation for the to be written value at tsched becomes
|
|
* correct:
|
|
*
|
|
* newval = tsched + set_offset_nsec - NSEC_PER_SEC
|
|
* and (tsched + set_offset_nsec) % NSEC_PER_SEC == 0
|
|
*/
|
|
unsigned long set_offset_nsec;
|
|
|
|
time64_t range_min;
|
|
timeu64_t range_max;
|
|
time64_t start_secs;
|
|
time64_t offset_secs;
|
|
bool set_start_time;
|
|
|
|
#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)
|
|
|
|
#define rtc_lock(d) mutex_lock(&d->ops_lock)
|
|
#define rtc_unlock(d) mutex_unlock(&d->ops_lock)
|
|
|
|
/* useful timestamps */
|
|
#define RTC_TIMESTAMP_BEGIN_0000 -62167219200ULL /* 0000-01-01 00:00:00 */
|
|
#define RTC_TIMESTAMP_BEGIN_1900 -2208988800LL /* 1900-01-01 00:00:00 */
|
|
#define RTC_TIMESTAMP_BEGIN_2000 946684800LL /* 2000-01-01 00:00:00 */
|
|
#define RTC_TIMESTAMP_END_2063 2966371199LL /* 2063-12-31 23:59:59 */
|
|
#define RTC_TIMESTAMP_END_2079 3471292799LL /* 2079-12-31 23:59:59 */
|
|
#define RTC_TIMESTAMP_END_2099 4102444799LL /* 2099-12-31 23:59:59 */
|
|
#define RTC_TIMESTAMP_END_2199 7258118399LL /* 2199-12-31 23:59:59 */
|
|
#define RTC_TIMESTAMP_END_9999 253402300799LL /* 9999-12-31 23:59:59 */
|
|
|
|
extern struct rtc_device *devm_rtc_device_register(struct device *dev,
|
|
const char *name,
|
|
const struct rtc_class_ops *ops,
|
|
struct module *owner);
|
|
struct rtc_device *devm_rtc_allocate_device(struct device *dev);
|
|
int __devm_rtc_register_device(struct module *owner, 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);
|
|
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_set_state(struct rtc_device *rtc, int enabled);
|
|
extern int rtc_irq_set_freq(struct rtc_device *rtc, 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(struct rtc_device *rtc);
|
|
void rtc_uie_update_irq(struct rtc_device *rtc);
|
|
enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
|
|
|
|
void rtc_timer_init(struct rtc_timer *timer, void (*f)(struct rtc_device *r),
|
|
struct rtc_device *rtc);
|
|
int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,
|
|
ktime_t expires, ktime_t period);
|
|
void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer);
|
|
int rtc_read_offset(struct rtc_device *rtc, long *offset);
|
|
int rtc_set_offset(struct rtc_device *rtc, long offset);
|
|
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);
|
|
}
|
|
|
|
#define devm_rtc_register_device(device) \
|
|
__devm_rtc_register_device(THIS_MODULE, device)
|
|
|
|
#ifdef CONFIG_RTC_HCTOSYS_DEVICE
|
|
extern int rtc_hctosys_ret;
|
|
#else
|
|
#define rtc_hctosys_ret -ENODEV
|
|
#endif
|
|
|
|
#ifdef CONFIG_RTC_NVMEM
|
|
int devm_rtc_nvmem_register(struct rtc_device *rtc,
|
|
struct nvmem_config *nvmem_config);
|
|
#else
|
|
static inline int devm_rtc_nvmem_register(struct rtc_device *rtc,
|
|
struct nvmem_config *nvmem_config)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_RTC_INTF_SYSFS
|
|
int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp);
|
|
int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps);
|
|
#else
|
|
static inline
|
|
int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
#endif /* _LINUX_RTC_H_ */
|