LXR linux/include/linux/rtc.h

   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/* 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
 100#ifdef __KERNEL__
 101
 102#include <linux/types.h>
 103#include <linux/interrupt.h>
 104
 105extern int rtc_month_days(unsigned int month, unsigned int year);
 106extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
 107extern int rtc_valid_tm(struct rtc_time *tm);
 108extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
 109extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
 110
 111#include <linux/device.h>
 112#include <linux/seq_file.h>
 113#include <linux/cdev.h>
 114#include <linux/poll.h>
 115#include <linux/mutex.h>
 116
 117extern struct class *rtc_class;
 118
 119/*
 120 * For these RTC methods the device parameter is the physical device
 121 * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
 122 * was passed to rtc_device_register().  Its driver_data normally holds
 123 * device state, including the rtc_device pointer for the RTC.
 124 *
 125 * Most of these methods are called with rtc_device.ops_lock held,
 126 * through the rtc_*(struct rtc_device *, ...) calls.
 127 *
 128 * The (current) exceptions are mostly filesystem hooks:
 129 *   - the proc() hook for procfs
 130 *   - non-ioctl() chardev hooks:  open(), release(), read_callback()
 131 *   - periodic irq calls:  irq_set_state(), irq_set_freq()
 132 *
 133 * REVISIT those periodic irq calls *do* have ops_lock when they're
 134 * issued through ioctl() ...
 135 */
 136struct rtc_class_ops {
 137        int (*open)(struct device *);
 138        void (*release)(struct device *);
 139        int (*ioctl)(struct device *, unsigned int, unsigned long);
 140        int (*read_time)(struct device *, struct rtc_time *);
 141        int (*set_time)(struct device *, struct rtc_time *);
 142        int (*read_alarm)(struct device *, struct rtc_wkalrm *);
 143        int (*set_alarm)(struct device *, struct rtc_wkalrm *);
 144        int (*proc)(struct device *, struct seq_file *);
 145        int (*set_mmss)(struct device *, unsigned long secs);
 146        int (*irq_set_state)(struct device *, int enabled);
 147        int (*irq_set_freq)(struct device *, int freq);
 148        int (*read_callback)(struct device *, int data);
 149        int (*alarm_irq_enable)(struct device *, unsigned int enabled);
 150        int (*update_irq_enable)(struct device *, unsigned int enabled);
 151};
 152
 153#define RTC_DEVICE_NAME_SIZE 20
 154struct rtc_task;
 155
 156/* flags */
 157#define RTC_DEV_BUSY 0
 158
 159struct rtc_device
 160{
 161        struct device dev;
 162        struct module *owner;
 163
 164        int id;
 165        char name[RTC_DEVICE_NAME_SIZE];
 166
 167        const struct rtc_class_ops *ops;
 168        struct mutex ops_lock;
 169
 170        struct cdev char_dev;
 171        unsigned long flags;
 172
 173        unsigned long irq_data;
 174        spinlock_t irq_lock;
 175        wait_queue_head_t irq_queue;
 176        struct fasync_struct *async_queue;
 177
 178        struct rtc_task *irq_task;
 179        spinlock_t irq_task_lock;
 180        int irq_freq;
 181        int max_user_freq;
 182#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
 183        struct work_struct uie_task;
 184        struct timer_list uie_timer;
 185        /* Those fields are protected by rtc->irq_lock */
 186        unsigned int oldsecs;
 187        unsigned int uie_irq_active:1;
 188        unsigned int stop_uie_polling:1;
 189        unsigned int uie_task_active:1;
 190        unsigned int uie_timer_active:1;
 191#endif
 192};
 193#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
 194
 195extern struct rtc_device *rtc_device_register(const char *name,
 196                                        struct device *dev,
 197                                        const struct rtc_class_ops *ops,
 198                                        struct module *owner);
 199extern void rtc_device_unregister(struct rtc_device *rtc);
 200
 201extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
 202extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
 203extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
 204extern int rtc_read_alarm(struct rtc_device *rtc,
 205                        struct rtc_wkalrm *alrm);
 206extern int rtc_set_alarm(struct rtc_device *rtc,
 207                                struct rtc_wkalrm *alrm);
 208extern void rtc_update_irq(struct rtc_device *rtc,
 209                        unsigned long num, unsigned long events);
 210
 211extern struct rtc_device *rtc_class_open(char *name);
 212extern void rtc_class_close(struct rtc_device *rtc);
 213
 214extern int rtc_irq_register(struct rtc_device *rtc,
 215                                struct rtc_task *task);
 216extern void rtc_irq_unregister(struct rtc_device *rtc,
 217                                struct rtc_task *task);
 218extern int rtc_irq_set_state(struct rtc_device *rtc,
 219                                struct rtc_task *task, int enabled);
 220extern int rtc_irq_set_freq(struct rtc_device *rtc,
 221                                struct rtc_task *task, int freq);
 222extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 223extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
 224extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
 225                                                unsigned int enabled);
 226
 227typedef struct rtc_task {
 228        void (*func)(void *private_data);
 229        void *private_data;
 230} rtc_task_t;
 231
 232int rtc_register(rtc_task_t *task);
 233int rtc_unregister(rtc_task_t *task);
 234int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
 235
 236static inline bool is_leap_year(unsigned int year)
 237{
 238        return (!(year % 4) && (year % 100)) || !(year % 400);
 239}
 240
 241#endif /* __KERNEL__ */
 242
 243#endif /* _LINUX_RTC_H_ */
 244