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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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. | |
ab6a2d70 | 8 | * |
1da177e4 LT |
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 | ||
1da177e4 | 15 | |
78d89ef4 | 16 | #include <linux/types.h> |
4024ce5e | 17 | #include <linux/interrupt.h> |
697e5a47 | 18 | #include <linux/nvmem-provider.h> |
607ca46e | 19 | #include <uapi/linux/rtc.h> |
4024ce5e | 20 | |
c58411e9 | 21 | extern int rtc_month_days(unsigned int month, unsigned int year); |
8232212e | 22 | extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year); |
c58411e9 | 23 | extern int rtc_valid_tm(struct rtc_time *tm); |
c2c11ae4 | 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); | |
6610e089 JS |
26 | ktime_t rtc_tm_to_ktime(struct rtc_time tm); |
27 | struct rtc_time rtc_ktime_to_tm(ktime_t kt); | |
28 | ||
92000257 XP |
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 | ||
c2c11ae4 | 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 | ||
c2c11ae4 | 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 | } | |
c58411e9 | 48 | |
0c86edc0 AZ |
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> | |
6610e089 JS |
54 | #include <linux/timerqueue.h> |
55 | #include <linux/workqueue.h> | |
0c86edc0 AZ |
56 | |
57 | extern struct class *rtc_class; | |
58 | ||
5ad31a57 DB |
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() | |
5ad31a57 DB |
71 | * |
72 | * REVISIT those periodic irq calls *do* have ops_lock when they're | |
73 | * issued through ioctl() ... | |
74 | */ | |
0c86edc0 | 75 | struct rtc_class_ops { |
0c86edc0 AZ |
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 *); | |
8e4ff1a8 | 82 | int (*set_mmss64)(struct device *, time64_t secs); |
0c86edc0 | 83 | int (*set_mmss)(struct device *, unsigned long secs); |
0c86edc0 | 84 | int (*read_callback)(struct device *, int data); |
099e6576 | 85 | int (*alarm_irq_enable)(struct device *, unsigned int enabled); |
b3967067 JC |
86 | int (*read_offset)(struct device *, long *offset); |
87 | int (*set_offset)(struct device *, long offset); | |
0c86edc0 AZ |
88 | }; |
89 | ||
6610e089 | 90 | struct rtc_timer { |
6610e089 JS |
91 | struct timerqueue_node node; |
92 | ktime_t period; | |
5a5ba10f AB |
93 | void (*func)(void *private_data); |
94 | void *private_data; | |
6610e089 JS |
95 | int enabled; |
96 | }; | |
97 | ||
0c86edc0 | 98 | |
8853c202 JK |
99 | /* flags */ |
100 | #define RTC_DEV_BUSY 0 | |
101 | ||
1796dcce | 102 | struct rtc_device { |
cd966209 | 103 | struct device dev; |
0c86edc0 AZ |
104 | struct module *owner; |
105 | ||
106 | int id; | |
0c86edc0 | 107 | |
ff8371ac | 108 | const struct rtc_class_ops *ops; |
0c86edc0 AZ |
109 | struct mutex ops_lock; |
110 | ||
0c86edc0 | 111 | struct cdev char_dev; |
8853c202 | 112 | unsigned long flags; |
0c86edc0 AZ |
113 | |
114 | unsigned long irq_data; | |
115 | spinlock_t irq_lock; | |
116 | wait_queue_head_t irq_queue; | |
117 | struct fasync_struct *async_queue; | |
118 | ||
0c86edc0 | 119 | int irq_freq; |
110d693d | 120 | int max_user_freq; |
6610e089 JS |
121 | |
122 | struct timerqueue_head timerqueue; | |
123 | struct rtc_timer aie_timer; | |
124 | struct rtc_timer uie_rtctimer; | |
125 | struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */ | |
126 | int pie_enabled; | |
127 | struct work_struct irqwork; | |
4a649903 JS |
128 | /* Some hardware can't support UIE mode */ |
129 | int uie_unsupported; | |
6e57b1d6 | 130 | |
0f295b06 JG |
131 | /* Number of nsec it takes to set the RTC clock. This influences when |
132 | * the set ops are called. An offset: | |
133 | * - of 0.5 s will call RTC set for wall clock time 10.0 s at 9.5 s | |
134 | * - of 1.5 s will call RTC set for wall clock time 10.0 s at 8.5 s | |
135 | * - of -0.5 s will call RTC set for wall clock time 10.0 s at 10.5 s | |
136 | */ | |
137 | long set_offset_nsec; | |
138 | ||
3068a254 AB |
139 | bool registered; |
140 | ||
697e5a47 AB |
141 | struct nvmem_device *nvmem; |
142 | /* Old ABI support */ | |
143 | bool nvram_old_abi; | |
144 | struct bin_attribute *nvram; | |
145 | ||
71db049e AB |
146 | time64_t range_min; |
147 | timeu64_t range_max; | |
98951564 BW |
148 | time64_t start_secs; |
149 | time64_t offset_secs; | |
150 | bool set_start_time; | |
71db049e | 151 | |
6e57b1d6 JS |
152 | #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL |
153 | struct work_struct uie_task; | |
154 | struct timer_list uie_timer; | |
155 | /* Those fields are protected by rtc->irq_lock */ | |
156 | unsigned int oldsecs; | |
157 | unsigned int uie_irq_active:1; | |
158 | unsigned int stop_uie_polling:1; | |
159 | unsigned int uie_task_active:1; | |
160 | unsigned int uie_timer_active:1; | |
161 | #endif | |
0c86edc0 | 162 | }; |
cd966209 | 163 | #define to_rtc_device(d) container_of(d, struct rtc_device, dev) |
0c86edc0 | 164 | |
83bbc5ac AB |
165 | /* useful timestamps */ |
166 | #define RTC_TIMESTAMP_BEGIN_1900 -2208989361LL /* 1900-01-01 00:00:00 */ | |
167 | #define RTC_TIMESTAMP_BEGIN_2000 946684800LL /* 2000-01-01 00:00:00 */ | |
168 | #define RTC_TIMESTAMP_END_2099 4102444799LL /* 2099-12-31 23:59:59 */ | |
169 | ||
6636a994 JH |
170 | extern struct rtc_device *devm_rtc_device_register(struct device *dev, |
171 | const char *name, | |
3e217b66 JH |
172 | const struct rtc_class_ops *ops, |
173 | struct module *owner); | |
3068a254 AB |
174 | struct rtc_device *devm_rtc_allocate_device(struct device *dev); |
175 | int __rtc_register_device(struct module *owner, struct rtc_device *rtc); | |
3e217b66 JH |
176 | extern void devm_rtc_device_unregister(struct device *dev, |
177 | struct rtc_device *rtc); | |
0c86edc0 | 178 | |
ab6a2d70 DB |
179 | extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm); |
180 | extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm); | |
0f295b06 | 181 | extern int rtc_set_ntp_time(struct timespec64 now, unsigned long *target_nsec); |
f44f7f96 | 182 | int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm); |
ab6a2d70 | 183 | extern int rtc_read_alarm(struct rtc_device *rtc, |
0c86edc0 | 184 | struct rtc_wkalrm *alrm); |
ab6a2d70 | 185 | extern int rtc_set_alarm(struct rtc_device *rtc, |
0c86edc0 | 186 | struct rtc_wkalrm *alrm); |
f6d5b331 JS |
187 | extern int rtc_initialize_alarm(struct rtc_device *rtc, |
188 | struct rtc_wkalrm *alrm); | |
ab6a2d70 | 189 | extern void rtc_update_irq(struct rtc_device *rtc, |
0c86edc0 AZ |
190 | unsigned long num, unsigned long events); |
191 | ||
9f3b795a | 192 | extern struct rtc_device *rtc_class_open(const char *name); |
ab6a2d70 | 193 | extern void rtc_class_close(struct rtc_device *rtc); |
0c86edc0 | 194 | |
8719d3c9 AB |
195 | extern int rtc_irq_set_state(struct rtc_device *rtc, int enabled); |
196 | extern int rtc_irq_set_freq(struct rtc_device *rtc, int freq); | |
099e6576 AZ |
197 | extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled); |
198 | extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled); | |
6e57b1d6 JS |
199 | extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, |
200 | unsigned int enabled); | |
0c86edc0 | 201 | |
456d66ec | 202 | void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode); |
6610e089 JS |
203 | void rtc_aie_update_irq(void *private); |
204 | void rtc_uie_update_irq(void *private); | |
205 | enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer); | |
1da177e4 | 206 | |
1796dcce KK |
207 | void rtc_timer_init(struct rtc_timer *timer, void (*f)(void *p), void *data); |
208 | int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer, | |
209 | ktime_t expires, ktime_t period); | |
73744a64 | 210 | void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer); |
b3967067 JC |
211 | int rtc_read_offset(struct rtc_device *rtc, long *offset); |
212 | int rtc_set_offset(struct rtc_device *rtc, long offset); | |
96c8f06a | 213 | void rtc_timer_do_work(struct work_struct *work); |
6610e089 | 214 | |
78d89ef4 AM |
215 | static inline bool is_leap_year(unsigned int year) |
216 | { | |
217 | return (!(year % 4) && (year % 100)) || !(year % 400); | |
218 | } | |
219 | ||
0f295b06 JG |
220 | /* Determine if we can call to driver to set the time. Drivers can only be |
221 | * called to set a second aligned time value, and the field set_offset_nsec | |
222 | * specifies how far away from the second aligned time to call the driver. | |
223 | * | |
224 | * This also computes 'to_set' which is the time we are trying to set, and has | |
225 | * a zero in tv_nsecs, such that: | |
226 | * to_set - set_delay_nsec == now +/- FUZZ | |
227 | * | |
228 | */ | |
229 | static inline bool rtc_tv_nsec_ok(s64 set_offset_nsec, | |
230 | struct timespec64 *to_set, | |
231 | const struct timespec64 *now) | |
232 | { | |
233 | /* Allowed error in tv_nsec, arbitarily set to 5 jiffies in ns. */ | |
234 | const unsigned long TIME_SET_NSEC_FUZZ = TICK_NSEC * 5; | |
235 | struct timespec64 delay = {.tv_sec = 0, | |
236 | .tv_nsec = set_offset_nsec}; | |
237 | ||
238 | *to_set = timespec64_add(*now, delay); | |
239 | ||
240 | if (to_set->tv_nsec < TIME_SET_NSEC_FUZZ) { | |
241 | to_set->tv_nsec = 0; | |
242 | return true; | |
243 | } | |
244 | ||
245 | if (to_set->tv_nsec > NSEC_PER_SEC - TIME_SET_NSEC_FUZZ) { | |
246 | to_set->tv_sec++; | |
247 | to_set->tv_nsec = 0; | |
248 | return true; | |
249 | } | |
250 | return false; | |
251 | } | |
252 | ||
3068a254 AB |
253 | #define rtc_register_device(device) \ |
254 | __rtc_register_device(THIS_MODULE, device) | |
255 | ||
4c24e29e | 256 | #ifdef CONFIG_RTC_HCTOSYS_DEVICE |
d0ab4a4d UKK |
257 | extern int rtc_hctosys_ret; |
258 | #else | |
259 | #define rtc_hctosys_ret -ENODEV | |
260 | #endif | |
261 | ||
fd5cd21d AB |
262 | #ifdef CONFIG_RTC_NVMEM |
263 | int rtc_nvmem_register(struct rtc_device *rtc, | |
264 | struct nvmem_config *nvmem_config); | |
265 | void rtc_nvmem_unregister(struct rtc_device *rtc); | |
266 | #else | |
267 | static inline int rtc_nvmem_register(struct rtc_device *rtc, | |
268 | struct nvmem_config *nvmem_config) | |
269 | { | |
c59b3715 | 270 | return 0; |
fd5cd21d AB |
271 | } |
272 | static inline void rtc_nvmem_unregister(struct rtc_device *rtc) {} | |
273 | #endif | |
274 | ||
eb2bccb7 AB |
275 | #ifdef CONFIG_RTC_INTF_SYSFS |
276 | int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp); | |
277 | int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps); | |
278 | #else | |
279 | static inline | |
280 | int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp) | |
281 | { | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static inline | |
286 | int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps) | |
287 | { | |
288 | return 0; | |
289 | } | |
290 | #endif | |
1da177e4 | 291 | #endif /* _LINUX_RTC_H_ */ |