linux/include/linux/rtc.h
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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 * The struct used to pass data via the following ioctl. Similar to the
  16 * struct tm in <time.h>, but it needs to be here so that the kernel
  17 * 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 {
  37        unsigned char enabled;  /* 0 = alarm disabled, 1 = alarm enabled */
  38        unsigned char pending;  /* 0 = alarm not pending, 1 = alarm pending */
  39        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
  53 */
  54
  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
  94#define RTC_VL_READ     _IOR('p', 0x13, int)    /* Voltage low detector */
  95#define RTC_VL_CLR      _IO('p', 0x14)          /* Clear voltage low information */
  96
  97/* interrupt flags */
  98#define RTC_IRQF 0x80   /* Any of the following is active */
  99#define RTC_PF 0x40     /* Periodic interrupt */
 100#define RTC_AF 0x20     /* Alarm interrupt */
 101#define RTC_UF 0x10     /* Update interrupt for 1Hz RTC */
 102
 103
 104#define RTC_MAX_FREQ    8192
 105
 106#ifdef __KERNEL__
 107
 108#include <linux/types.h>
 109#include <linux/interrupt.h>
 110
 111extern int rtc_month_days(unsigned int month, unsigned int year);
 112extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
 113extern int rtc_valid_tm(struct rtc_time *tm);
 114extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
 115extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
 116ktime_t rtc_tm_to_ktime(struct rtc_time tm);
 117struct rtc_time rtc_ktime_to_tm(ktime_t kt);
 118
 119
 120#include <linux/device.h>
 121#include <linux/seq_file.h>
 122#include <linux/cdev.h>
 123#include <linux/poll.h>
 124#include <linux/mutex.h>
 125#include <linux/timerqueue.h>
 126#include <linux/workqueue.h>
 127
 128extern struct class *rtc_class;
 129
 130/*
 131 * For these RTC methods the device parameter is the physical device
 132 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
 133 * was passed to rtc_device_register().  Its driver_data normally holds
 134 * device state, including the rtc_device pointer for the RTC.
 135 *
 136 * Most of these methods are called with rtc_device.ops_lock held,
 137 * through the rtc_*(struct rtc_device *, ...) calls.
 138 *
 139 * The (current) exceptions are mostly filesystem hooks:
 140 *   - the proc() hook for procfs
 141 *   - non-ioctl() chardev hooks:  open(), release(), read_callback()
 142 *
 143 * REVISIT those periodic irq calls *do* have ops_lock when they're
 144 * issued through ioctl() ...
 145 */
 146struct rtc_class_ops {
 147        int (*open)(struct device *);
 148        void (*release)(struct device *);
 149        int (*ioctl)(struct device *, unsigned int, unsigned long);
 150        int (*read_time)(struct device *, struct rtc_time *);
 151        int (*set_time)(struct device *, struct rtc_time *);
 152        int (*read_alarm)(struct device *, struct rtc_wkalrm *);
 153        int (*set_alarm)(struct device *, struct rtc_wkalrm *);
 154        int (*proc)(struct device *, struct seq_file *);
 155        int (*set_mmss)(struct device *, unsigned long secs);
 156        int (*read_callback)(struct device *, int data);
 157        int (*alarm_irq_enable)(struct device *, unsigned int enabled);
 158};
 159
 160#define RTC_DEVICE_NAME_SIZE 20
 161typedef struct rtc_task {
 162        void (*func)(void *private_data);
 163        void *private_data;
 164} rtc_task_t;
 165
 166
 167struct rtc_timer {
 168        struct rtc_task task;
 169        struct timerqueue_node node;
 170        ktime_t period;
 171        int enabled;
 172};
 173
 174
 175/* flags */
 176#define RTC_DEV_BUSY 0
 177
 178struct rtc_device
 179{
 180        struct device dev;
 181        struct module *owner;
 182
 183        int id;
 184        char name[RTC_DEVICE_NAME_SIZE];
 185
 186        const struct rtc_class_ops *ops;
 187        struct mutex ops_lock;
 188
 189        struct cdev char_dev;
 190        unsigned long flags;
 191
 192        unsigned long irq_data;
 193        spinlock_t irq_lock;
 194        wait_queue_head_t irq_queue;
 195        struct fasync_struct *async_queue;
 196
 197        struct rtc_task *irq_task;
 198        spinlock_t irq_task_lock;
 199        int irq_freq;
 200        int max_user_freq;
 201
 202        struct timerqueue_head timerqueue;
 203        struct rtc_timer aie_timer;
 204        struct rtc_timer uie_rtctimer;
 205        struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
 206        int pie_enabled;
 207        struct work_struct irqwork;
 208        /* Some hardware can't support UIE mode */
 209        int uie_unsupported;
 210
 211#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
 212        struct work_struct uie_task;
 213        struct timer_list uie_timer;
 214        /* Those fields are protected by rtc->irq_lock */
 215        unsigned int oldsecs;
 216        unsigned int uie_irq_active:1;
 217        unsigned int stop_uie_polling:1;
 218        unsigned int uie_task_active:1;
 219        unsigned int uie_timer_active:1;
 220#endif
 221};
 222#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
 223
 224extern struct rtc_device *rtc_device_register(const char *name,
 225                                        struct device *dev,
 226                                        const struct rtc_class_ops *ops,
 227                                        struct module *owner);
 228extern void rtc_device_unregister(struct rtc_device *rtc);
 229
 230extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
 231extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
 232extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
 233int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
 234extern int rtc_read_alarm(struct rtc_device *rtc,
 235                        struct rtc_wkalrm *alrm);
 236extern int rtc_set_alarm(struct rtc_device *rtc,
 237                                struct rtc_wkalrm *alrm);
 238extern int rtc_initialize_alarm(struct rtc_device *rtc,
 239                                struct rtc_wkalrm *alrm);
 240extern void rtc_update_irq(struct rtc_device *rtc,
 241                        unsigned long num, unsigned long events);
 242
 243extern struct rtc_device *rtc_class_open(char *name);
 244extern void rtc_class_close(struct rtc_device *rtc);
 245
 246extern int rtc_irq_register(struct rtc_device *rtc,
 247                                struct rtc_task *task);
 248extern void rtc_irq_unregister(struct rtc_device *rtc,
 249                                struct rtc_task *task);
 250extern int rtc_irq_set_state(struct rtc_device *rtc,
 251                                struct rtc_task *task, int enabled);
 252extern int rtc_irq_set_freq(struct rtc_device *rtc,
 253                                struct rtc_task *task, int freq);
 254extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 255extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 256extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
 257                                                unsigned int enabled);
 258
 259void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
 260void rtc_aie_update_irq(void *private);
 261void rtc_uie_update_irq(void *private);
 262enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
 263
 264int rtc_register(rtc_task_t *task);
 265int rtc_unregister(rtc_task_t *task);
 266int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
 267
 268void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data);
 269int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer,
 270                        ktime_t expires, ktime_t period);
 271int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer);
 272void rtc_timer_do_work(struct work_struct *work);
 273
 274static inline bool is_leap_year(unsigned int year)
 275{
 276        return (!(year % 4) && (year % 100)) || !(year % 400);
 277}
 278
 279#ifdef CONFIG_RTC_HCTOSYS
 280extern int rtc_hctosys_ret;
 281#else
 282#define rtc_hctosys_ret -ENODEV
 283#endif
 284
 285#endif /* __KERNEL__ */
 286
 287#endif /* _LINUX_RTC_H_ */
 288
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