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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 <linux/nvmem-provider.h>
18#include <uapi/linux/rtc.h>
19
20extern int rtc_month_days(unsigned int month, unsigned int year);
21extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
22extern int rtc_valid_tm(struct rtc_time *tm);
23extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
24extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
25ktime_t rtc_tm_to_ktime(struct rtc_time tm);
26struct rtc_time rtc_ktime_to_tm(ktime_t kt);
27
28/*
29 * rtc_tm_sub - Return the difference in seconds.
30 */
31static inline time64_t rtc_tm_sub(struct rtc_time *lhs, struct rtc_time *rhs)
32{
33 return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
34}
35
36static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
37{
38 rtc_time64_to_tm(time, tm);
39}
40
41static inline int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
42{
43 *time = rtc_tm_to_time64(tm);
44
45 return 0;
46}
47
48#include <linux/device.h>
49#include <linux/seq_file.h>
50#include <linux/cdev.h>
51#include <linux/poll.h>
52#include <linux/mutex.h>
53#include <linux/timerqueue.h>
54#include <linux/workqueue.h>
55
56extern struct class *rtc_class;
57
58/*
59 * For these RTC methods the device parameter is the physical device
60 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
61 * was passed to rtc_device_register(). Its driver_data normally holds
62 * device state, including the rtc_device pointer for the RTC.
63 *
64 * Most of these methods are called with rtc_device.ops_lock held,
65 * through the rtc_*(struct rtc_device *, ...) calls.
66 *
67 * The (current) exceptions are mostly filesystem hooks:
68 * - the proc() hook for procfs
69 * - non-ioctl() chardev hooks: open(), release(), read_callback()
70 *
71 * REVISIT those periodic irq calls *do* have ops_lock when they're
72 * issued through ioctl() ...
73 */
74struct rtc_class_ops {
75 int (*open)(struct device *);
76 void (*release)(struct device *);
77 int (*ioctl)(struct device *, unsigned int, unsigned long);
78 int (*read_time)(struct device *, struct rtc_time *);
79 int (*set_time)(struct device *, struct rtc_time *);
80 int (*read_alarm)(struct device *, struct rtc_wkalrm *);
81 int (*set_alarm)(struct device *, struct rtc_wkalrm *);
82 int (*proc)(struct device *, struct seq_file *);
83 int (*set_mmss64)(struct device *, time64_t secs);
84 int (*set_mmss)(struct device *, unsigned long secs);
85 int (*read_callback)(struct device *, int data);
86 int (*alarm_irq_enable)(struct device *, unsigned int enabled);
87 int (*read_offset)(struct device *, long *offset);
88 int (*set_offset)(struct device *, long offset);
89};
90
91#define RTC_DEVICE_NAME_SIZE 20
92typedef struct rtc_task {
93 void (*func)(void *private_data);
94 void *private_data;
95} rtc_task_t;
96
97
98struct rtc_timer {
99 struct rtc_task task;
100 struct timerqueue_node node;
101 ktime_t period;
102 int enabled;
103};
104
105
106/* flags */
107#define RTC_DEV_BUSY 0
108
109struct rtc_device {
110 struct device dev;
111 struct module *owner;
112
113 int id;
114
115 const struct rtc_class_ops *ops;
116 struct mutex ops_lock;
117
118 struct cdev char_dev;
119 unsigned long flags;
120
121 unsigned long irq_data;
122 spinlock_t irq_lock;
123 wait_queue_head_t irq_queue;
124 struct fasync_struct *async_queue;
125
126 struct rtc_task *irq_task;
127 spinlock_t irq_task_lock;
128 int irq_freq;
129 int max_user_freq;
130
131 struct timerqueue_head timerqueue;
132 struct rtc_timer aie_timer;
133 struct rtc_timer uie_rtctimer;
134 struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
135 int pie_enabled;
136 struct work_struct irqwork;
137 /* Some hardware can't support UIE mode */
138 int uie_unsupported;
139
140 bool registered;
141
142 struct nvmem_config *nvmem_config;
143 struct nvmem_device *nvmem;
144 /* Old ABI support */
145 bool nvram_old_abi;
146 struct bin_attribute *nvram;
147
148#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
149 struct work_struct uie_task;
150 struct timer_list uie_timer;
151 /* Those fields are protected by rtc->irq_lock */
152 unsigned int oldsecs;
153 unsigned int uie_irq_active:1;
154 unsigned int stop_uie_polling:1;
155 unsigned int uie_task_active:1;
156 unsigned int uie_timer_active:1;
157#endif
158};
159#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
160
161extern struct rtc_device *rtc_device_register(const char *name,
162 struct device *dev,
163 const struct rtc_class_ops *ops,
164 struct module *owner);
165extern struct rtc_device *devm_rtc_device_register(struct device *dev,
166 const char *name,
167 const struct rtc_class_ops *ops,
168 struct module *owner);
169struct rtc_device *devm_rtc_allocate_device(struct device *dev);
170int __rtc_register_device(struct module *owner, struct rtc_device *rtc);
171extern void rtc_device_unregister(struct rtc_device *rtc);
172extern void devm_rtc_device_unregister(struct device *dev,
173 struct rtc_device *rtc);
174
175extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
176extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
177extern int rtc_set_ntp_time(struct timespec64 now);
178int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
179extern int rtc_read_alarm(struct rtc_device *rtc,
180 struct rtc_wkalrm *alrm);
181extern int rtc_set_alarm(struct rtc_device *rtc,
182 struct rtc_wkalrm *alrm);
183extern int rtc_initialize_alarm(struct rtc_device *rtc,
184 struct rtc_wkalrm *alrm);
185extern void rtc_update_irq(struct rtc_device *rtc,
186 unsigned long num, unsigned long events);
187
188extern struct rtc_device *rtc_class_open(const char *name);
189extern void rtc_class_close(struct rtc_device *rtc);
190
191extern int rtc_irq_register(struct rtc_device *rtc,
192 struct rtc_task *task);
193extern void rtc_irq_unregister(struct rtc_device *rtc,
194 struct rtc_task *task);
195extern int rtc_irq_set_state(struct rtc_device *rtc,
196 struct rtc_task *task, int enabled);
197extern int rtc_irq_set_freq(struct rtc_device *rtc,
198 struct rtc_task *task, int freq);
199extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
200extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
201extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
202 unsigned int enabled);
203
204void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
205void rtc_aie_update_irq(void *private);
206void rtc_uie_update_irq(void *private);
207enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
208
209int rtc_register(rtc_task_t *task);
210int rtc_unregister(rtc_task_t *task);
211int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
212
213void rtc_timer_init(struct rtc_timer *timer, void (*f)(void *p), void *data);
214int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,
215 ktime_t expires, ktime_t period);
216void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer);
217int rtc_read_offset(struct rtc_device *rtc, long *offset);
218int rtc_set_offset(struct rtc_device *rtc, long offset);
219void rtc_timer_do_work(struct work_struct *work);
220
221static inline bool is_leap_year(unsigned int year)
222{
223 return (!(year % 4) && (year % 100)) || !(year % 400);
224}
225
226#define rtc_register_device(device) \
227 __rtc_register_device(THIS_MODULE, device)
228
229#ifdef CONFIG_RTC_HCTOSYS_DEVICE
230extern int rtc_hctosys_ret;
231#else
232#define rtc_hctosys_ret -ENODEV
233#endif
234
235#endif /* _LINUX_RTC_H_ */