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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
David Brownellab6a2d72007-05-08 00:33:30 -07007 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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 * The struct used to pass data via the following ioctl. Similar to the
David Brownellab6a2d72007-05-08 00:33:30 -070016 * struct tm in <time.h>, but it needs to be here so that the kernel
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * source is self contained, allowing cross-compiles, etc. etc.
18 */
19
20struct rtc_time {
21 int tm_sec;
22 int tm_min;
23 int tm_hour;
24 int tm_mday;
25 int tm_mon;
26 int tm_year;
27 int tm_wday;
28 int tm_yday;
29 int tm_isdst;
30};
31
32/*
33 * This data structure is inspired by the EFI (v0.92) wakeup
34 * alarm API.
35 */
36struct rtc_wkalrm {
Andrew Victor304228e2006-06-30 01:56:01 -070037 unsigned char enabled; /* 0 = alarm disabled, 1 = alarm enabled */
38 unsigned char pending; /* 0 = alarm not pending, 1 = alarm pending */
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 struct rtc_time time; /* time the alarm is set to */
40};
41
42/*
43 * Data structure to control PLL correction some better RTC feature
44 * pll_value is used to get or set current value of correction,
45 * the rest of the struct is used to query HW capabilities.
46 * This is modeled after the RTC used in Q40/Q60 computers but
47 * should be sufficiently flexible for other devices
48 *
49 * +ve pll_value means clock will run faster by
50 * pll_value*pll_posmult/pll_clock
51 * -ve pll_value means clock will run slower by
52 * pll_value*pll_negmult/pll_clock
David Brownellab6a2d72007-05-08 00:33:30 -070053 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55struct rtc_pll_info {
56 int pll_ctrl; /* placeholder for fancier control */
57 int pll_value; /* get/set correction value */
58 int pll_max; /* max +ve (faster) adjustment value */
59 int pll_min; /* max -ve (slower) adjustment value */
60 int pll_posmult; /* factor for +ve correction */
61 int pll_negmult; /* factor for -ve correction */
62 long pll_clock; /* base PLL frequency */
63};
64
65/*
66 * ioctl calls that are permitted to the /dev/rtc interface, if
67 * any of the RTC drivers are enabled.
68 */
69
70#define RTC_AIE_ON _IO('p', 0x01) /* Alarm int. enable on */
71#define RTC_AIE_OFF _IO('p', 0x02) /* ... off */
72#define RTC_UIE_ON _IO('p', 0x03) /* Update int. enable on */
73#define RTC_UIE_OFF _IO('p', 0x04) /* ... off */
74#define RTC_PIE_ON _IO('p', 0x05) /* Periodic int. enable on */
75#define RTC_PIE_OFF _IO('p', 0x06) /* ... off */
76#define RTC_WIE_ON _IO('p', 0x0f) /* Watchdog int. enable on */
77#define RTC_WIE_OFF _IO('p', 0x10) /* ... off */
78
79#define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time) /* Set alarm time */
80#define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
81#define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time) /* Read RTC time */
82#define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time) /* Set RTC time */
83#define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long) /* Read IRQ rate */
84#define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long) /* Set IRQ rate */
85#define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long) /* Read epoch */
86#define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long) /* Set epoch */
87
88#define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
89#define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
90
91#define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */
92#define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */
93
Alessandro Zummo0c86edc2006-03-27 01:16:37 -080094/* interrupt flags */
95#define RTC_IRQF 0x80 /* any of the following is active */
96#define RTC_PF 0x40
97#define RTC_AF 0x20
98#define RTC_UF 0x10
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#ifdef __KERNEL__
101
Joe Korty4024ce52006-03-22 00:07:43 -0800102#include <linux/interrupt.h>
103
Alessandro Zummoc58411e2006-03-27 01:16:34 -0800104extern int rtc_month_days(unsigned int month, unsigned int year);
Andrew Victor82322122006-06-25 05:48:25 -0700105extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
Alessandro Zummoc58411e2006-03-27 01:16:34 -0800106extern int rtc_valid_tm(struct rtc_time *tm);
107extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
108extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
109
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800110#include <linux/device.h>
111#include <linux/seq_file.h>
112#include <linux/cdev.h>
113#include <linux/poll.h>
114#include <linux/mutex.h>
115
116extern struct class *rtc_class;
117
David Brownell5ad31a572008-07-23 21:30:33 -0700118/*
119 * For these RTC methods the device parameter is the physical device
120 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
121 * was passed to rtc_device_register(). Its driver_data normally holds
122 * device state, including the rtc_device pointer for the RTC.
123 *
124 * Most of these methods are called with rtc_device.ops_lock held,
125 * through the rtc_*(struct rtc_device *, ...) calls.
126 *
127 * The (current) exceptions are mostly filesystem hooks:
128 * - the proc() hook for procfs
129 * - non-ioctl() chardev hooks: open(), release(), read_callback()
130 * - periodic irq calls: irq_set_state(), irq_set_freq()
131 *
132 * REVISIT those periodic irq calls *do* have ops_lock when they're
133 * issued through ioctl() ...
134 */
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800135struct rtc_class_ops {
136 int (*open)(struct device *);
137 void (*release)(struct device *);
138 int (*ioctl)(struct device *, unsigned int, unsigned long);
139 int (*read_time)(struct device *, struct rtc_time *);
140 int (*set_time)(struct device *, struct rtc_time *);
141 int (*read_alarm)(struct device *, struct rtc_wkalrm *);
142 int (*set_alarm)(struct device *, struct rtc_wkalrm *);
143 int (*proc)(struct device *, struct seq_file *);
144 int (*set_mmss)(struct device *, unsigned long secs);
145 int (*irq_set_state)(struct device *, int enabled);
146 int (*irq_set_freq)(struct device *, int freq);
147 int (*read_callback)(struct device *, int data);
Alessandro Zummo099e6572009-01-04 12:00:54 -0800148 int (*alarm_irq_enable)(struct device *, unsigned int enabled);
149 int (*update_irq_enable)(struct device *, unsigned int enabled);
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800150};
151
152#define RTC_DEVICE_NAME_SIZE 20
153struct rtc_task;
154
Jiri Kosina8853c202007-11-28 16:22:03 -0800155/* flags */
156#define RTC_DEV_BUSY 0
157
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800158struct rtc_device
159{
David Brownellcd966202007-05-08 00:33:40 -0700160 struct device dev;
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800161 struct module *owner;
162
163 int id;
164 char name[RTC_DEVICE_NAME_SIZE];
165
David Brownellff8371a2006-09-30 23:28:17 -0700166 const struct rtc_class_ops *ops;
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800167 struct mutex ops_lock;
168
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800169 struct cdev char_dev;
Jiri Kosina8853c202007-11-28 16:22:03 -0800170 unsigned long flags;
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800171
172 unsigned long irq_data;
173 spinlock_t irq_lock;
174 wait_queue_head_t irq_queue;
175 struct fasync_struct *async_queue;
176
177 struct rtc_task *irq_task;
178 spinlock_t irq_task_lock;
179 int irq_freq;
Alessandro Zummo110d6932006-06-25 05:48:20 -0700180 int max_user_freq;
Atsushi Nemoto655066c2006-06-25 05:48:17 -0700181#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
182 struct work_struct uie_task;
183 struct timer_list uie_timer;
184 /* Those fields are protected by rtc->irq_lock */
185 unsigned int oldsecs;
Alessandro Zummo099e6572009-01-04 12:00:54 -0800186 unsigned int uie_irq_active:1;
Atsushi Nemoto655066c2006-06-25 05:48:17 -0700187 unsigned int stop_uie_polling:1;
188 unsigned int uie_task_active:1;
189 unsigned int uie_timer_active:1;
190#endif
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800191};
David Brownellcd966202007-05-08 00:33:40 -0700192#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800193
194extern struct rtc_device *rtc_device_register(const char *name,
195 struct device *dev,
David Brownellff8371a2006-09-30 23:28:17 -0700196 const struct rtc_class_ops *ops,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800197 struct module *owner);
David Brownellab6a2d72007-05-08 00:33:30 -0700198extern void rtc_device_unregister(struct rtc_device *rtc);
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800199
David Brownellab6a2d72007-05-08 00:33:30 -0700200extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
201extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
202extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
203extern int rtc_read_alarm(struct rtc_device *rtc,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800204 struct rtc_wkalrm *alrm);
David Brownellab6a2d72007-05-08 00:33:30 -0700205extern int rtc_set_alarm(struct rtc_device *rtc,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800206 struct rtc_wkalrm *alrm);
David Brownellab6a2d72007-05-08 00:33:30 -0700207extern void rtc_update_irq(struct rtc_device *rtc,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800208 unsigned long num, unsigned long events);
209
David Brownellab6a2d72007-05-08 00:33:30 -0700210extern struct rtc_device *rtc_class_open(char *name);
211extern void rtc_class_close(struct rtc_device *rtc);
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800212
David Brownellab6a2d72007-05-08 00:33:30 -0700213extern int rtc_irq_register(struct rtc_device *rtc,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800214 struct rtc_task *task);
David Brownellab6a2d72007-05-08 00:33:30 -0700215extern void rtc_irq_unregister(struct rtc_device *rtc,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800216 struct rtc_task *task);
David Brownellab6a2d72007-05-08 00:33:30 -0700217extern int rtc_irq_set_state(struct rtc_device *rtc,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800218 struct rtc_task *task, int enabled);
David Brownellab6a2d72007-05-08 00:33:30 -0700219extern int rtc_irq_set_freq(struct rtc_device *rtc,
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800220 struct rtc_task *task, int freq);
Alessandro Zummo099e6572009-01-04 12:00:54 -0800221extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
222extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
223extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
224 unsigned int enabled);
Alessandro Zummo0c86edc2006-03-27 01:16:37 -0800225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226typedef struct rtc_task {
227 void (*func)(void *private_data);
228 void *private_data;
229} rtc_task_t;
230
231int rtc_register(rtc_task_t *task);
232int rtc_unregister(rtc_task_t *task);
233int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235#endif /* __KERNEL__ */
236
237#endif /* _LINUX_RTC_H_ */