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TOMOYO Linux Cross Reference
Linux/include/linux/rtc.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Generic RTC interface.
  4  * This version contains the part of the user interface to the Real Time Clock
  5  * service. It is used with both the legacy mc146818 and also  EFI
  6  * Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
  7  * from <linux/mc146818rtc.h> to this file for 2.4 kernels.
  8  *
  9  * Copyright (C) 1999 Hewlett-Packard Co.
 10  * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
 11  */
 12 #ifndef _LINUX_RTC_H_
 13 #define _LINUX_RTC_H_
 14 
 15 
 16 #include <linux/types.h>
 17 #include <linux/interrupt.h>
 18 #include <linux/nvmem-provider.h>
 19 #include <uapi/linux/rtc.h>
 20 
 21 extern int rtc_month_days(unsigned int month, unsigned int year);
 22 extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
 23 extern int rtc_valid_tm(struct rtc_time *tm);
 24 extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
 25 extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
 26 ktime_t rtc_tm_to_ktime(struct rtc_time tm);
 27 struct rtc_time rtc_ktime_to_tm(ktime_t kt);
 28 
 29 /*
 30  * rtc_tm_sub - Return the difference in seconds.
 31  */
 32 static inline time64_t rtc_tm_sub(struct rtc_time *lhs, struct rtc_time *rhs)
 33 {
 34         return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
 35 }
 36 
 37 static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
 38 {
 39         rtc_time64_to_tm(time, tm);
 40 }
 41 
 42 static inline int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
 43 {
 44         *time = rtc_tm_to_time64(tm);
 45 
 46         return 0;
 47 }
 48 
 49 #include <linux/device.h>
 50 #include <linux/seq_file.h>
 51 #include <linux/cdev.h>
 52 #include <linux/poll.h>
 53 #include <linux/mutex.h>
 54 #include <linux/timerqueue.h>
 55 #include <linux/workqueue.h>
 56 
 57 extern struct class *rtc_class;
 58 
 59 /*
 60  * For these RTC methods the device parameter is the physical device
 61  * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
 62  * was passed to rtc_device_register().  Its driver_data normally holds
 63  * device state, including the rtc_device pointer for the RTC.
 64  *
 65  * Most of these methods are called with rtc_device.ops_lock held,
 66  * through the rtc_*(struct rtc_device *, ...) calls.
 67  *
 68  * The (current) exceptions are mostly filesystem hooks:
 69  *   - the proc() hook for procfs
 70  *   - non-ioctl() chardev hooks:  open(), release(), read_callback()
 71  *
 72  * REVISIT those periodic irq calls *do* have ops_lock when they're
 73  * issued through ioctl() ...
 74  */
 75 struct rtc_class_ops {
 76         int (*ioctl)(struct device *, unsigned int, unsigned long);
 77         int (*read_time)(struct device *, struct rtc_time *);
 78         int (*set_time)(struct device *, struct rtc_time *);
 79         int (*read_alarm)(struct device *, struct rtc_wkalrm *);
 80         int (*set_alarm)(struct device *, struct rtc_wkalrm *);
 81         int (*proc)(struct device *, struct seq_file *);
 82         int (*set_mmss64)(struct device *, time64_t secs);
 83         int (*set_mmss)(struct device *, unsigned long secs);
 84         int (*read_callback)(struct device *, int data);
 85         int (*alarm_irq_enable)(struct device *, unsigned int enabled);
 86         int (*read_offset)(struct device *, long *offset);
 87         int (*set_offset)(struct device *, long offset);
 88 };
 89 
 90 #define RTC_DEVICE_NAME_SIZE 20
 91 typedef struct rtc_task {
 92         void (*func)(void *private_data);
 93         void *private_data;
 94 } rtc_task_t;
 95 
 96 
 97 struct rtc_timer {
 98         struct rtc_task task;
 99         struct timerqueue_node node;
100         ktime_t period;
101         int enabled;
102 };
103 
104 
105 /* flags */
106 #define RTC_DEV_BUSY 0
107 
108 struct rtc_device {
109         struct device dev;
110         struct module *owner;
111 
112         int id;
113 
114         const struct rtc_class_ops *ops;
115         struct mutex ops_lock;
116 
117         struct cdev char_dev;
118         unsigned long flags;
119 
120         unsigned long irq_data;
121         spinlock_t irq_lock;
122         wait_queue_head_t irq_queue;
123         struct fasync_struct *async_queue;
124 
125         struct rtc_task *irq_task;
126         spinlock_t irq_task_lock;
127         int irq_freq;
128         int max_user_freq;
129 
130         struct timerqueue_head timerqueue;
131         struct rtc_timer aie_timer;
132         struct rtc_timer uie_rtctimer;
133         struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
134         int pie_enabled;
135         struct work_struct irqwork;
136         /* Some hardware can't support UIE mode */
137         int uie_unsupported;
138 
139         bool registered;
140 
141         struct nvmem_config *nvmem_config;
142         struct nvmem_device *nvmem;
143         /* Old ABI support */
144         bool nvram_old_abi;
145         struct bin_attribute *nvram;
146 
147 #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
148         struct work_struct uie_task;
149         struct timer_list uie_timer;
150         /* Those fields are protected by rtc->irq_lock */
151         unsigned int oldsecs;
152         unsigned int uie_irq_active:1;
153         unsigned int stop_uie_polling:1;
154         unsigned int uie_task_active:1;
155         unsigned int uie_timer_active:1;
156 #endif
157 };
158 #define to_rtc_device(d) container_of(d, struct rtc_device, dev)
159 
160 extern struct rtc_device *rtc_device_register(const char *name,
161                                         struct device *dev,
162                                         const struct rtc_class_ops *ops,
163                                         struct module *owner);
164 extern struct rtc_device *devm_rtc_device_register(struct device *dev,
165                                         const char *name,
166                                         const struct rtc_class_ops *ops,
167                                         struct module *owner);
168 struct rtc_device *devm_rtc_allocate_device(struct device *dev);
169 int __rtc_register_device(struct module *owner, struct rtc_device *rtc);
170 extern void rtc_device_unregister(struct rtc_device *rtc);
171 extern void devm_rtc_device_unregister(struct device *dev,
172                                         struct rtc_device *rtc);
173 
174 extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
175 extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
176 extern int rtc_set_ntp_time(struct timespec64 now);
177 int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
178 extern int rtc_read_alarm(struct rtc_device *rtc,
179                         struct rtc_wkalrm *alrm);
180 extern int rtc_set_alarm(struct rtc_device *rtc,
181                                 struct rtc_wkalrm *alrm);
182 extern int rtc_initialize_alarm(struct rtc_device *rtc,
183                                 struct rtc_wkalrm *alrm);
184 extern void rtc_update_irq(struct rtc_device *rtc,
185                         unsigned long num, unsigned long events);
186 
187 extern struct rtc_device *rtc_class_open(const char *name);
188 extern void rtc_class_close(struct rtc_device *rtc);
189 
190 extern int rtc_irq_register(struct rtc_device *rtc,
191                                 struct rtc_task *task);
192 extern void rtc_irq_unregister(struct rtc_device *rtc,
193                                 struct rtc_task *task);
194 extern int rtc_irq_set_state(struct rtc_device *rtc,
195                                 struct rtc_task *task, int enabled);
196 extern int rtc_irq_set_freq(struct rtc_device *rtc,
197                                 struct rtc_task *task, int freq);
198 extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
199 extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
200 extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
201                                                 unsigned int enabled);
202 
203 void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
204 void rtc_aie_update_irq(void *private);
205 void rtc_uie_update_irq(void *private);
206 enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
207 
208 int rtc_register(rtc_task_t *task);
209 int rtc_unregister(rtc_task_t *task);
210 int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
211 
212 void rtc_timer_init(struct rtc_timer *timer, void (*f)(void *p), void *data);
213 int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,
214                     ktime_t expires, ktime_t period);
215 void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer);
216 int rtc_read_offset(struct rtc_device *rtc, long *offset);
217 int rtc_set_offset(struct rtc_device *rtc, long offset);
218 void rtc_timer_do_work(struct work_struct *work);
219 
220 static inline bool is_leap_year(unsigned int year)
221 {
222         return (!(year % 4) && (year % 100)) || !(year % 400);
223 }
224 
225 #define rtc_register_device(device) \
226         __rtc_register_device(THIS_MODULE, device)
227 
228 #ifdef CONFIG_RTC_HCTOSYS_DEVICE
229 extern int rtc_hctosys_ret;
230 #else
231 #define rtc_hctosys_ret -ENODEV
232 #endif
233 
234 #endif /* _LINUX_RTC_H_ */
235 

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