include/rtc_.h

   1 /*
   2  * Common defines/structures/etc... for applets that need to work with the RTC.
   3  *
   4  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   5  */
   6
   7 #ifndef BB_RTC_H
   8 #define BB_RTC_H 1
   9
  10 #include "libbb.h"
  11
  12 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
  13
  14 #if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
  15 # define ADJTIME_PATH "/var/lib/hwclock/adjtime"
  16 #else
  17 # define ADJTIME_PATH "/etc/adjtime"
  18 #endif
  19
  20 int rtc_adjtime_is_utc(void) FAST_FUNC;
  21 int rtc_xopen(const char **default_rtc, int flags) FAST_FUNC;
  22 void rtc_read_tm(struct tm *ptm, int fd) FAST_FUNC;
  23 time_t rtc_tm2time(struct tm *ptm, int utc) FAST_FUNC;
  24
  25
  26 /*
  27  * Everything below this point has been copied from linux/rtc.h
  28  * to eliminate the kernel header dependency
  29  */
  30
  31 struct linux_rtc_time {
  32         int tm_sec;
  33         int tm_min;
  34         int tm_hour;
  35         int tm_mday;
  36         int tm_mon;
  37         int tm_year;
  38         int tm_wday;
  39         int tm_yday;
  40         int tm_isdst;
  41 };
  42
  43 struct linux_rtc_wkalrm {
  44         unsigned char enabled;  /* 0 = alarm disabled, 1 = alarm enabled */
  45         unsigned char pending;  /* 0 = alarm not pending, 1 = alarm pending */
  46         struct linux_rtc_time time;  /* time the alarm is set to */
  47 };
  48
  49 struct rtc_param {
  50         uint64_t param;
  51         union {
  52                 uint64_t uvalue;
  53                 int64_t svalue;
  54                 uint64_t ptr;
  55         };
  56         uint32_t index;
  57         uint32_t __pad;
  58 };
  59
  60 /*
  61  * ioctl calls that are permitted to the /dev/rtc interface, if
  62  * any of the RTC drivers are enabled.
  63  */
  64 #define RTC_AIE_ON      _IO('p', 0x01)  /* Alarm int. enable on         */
  65 #define RTC_AIE_OFF     _IO('p', 0x02)  /* ... off                      */
  66 #define RTC_UIE_ON      _IO('p', 0x03)  /* Update int. enable on        */
  67 #define RTC_UIE_OFF     _IO('p', 0x04)  /* ... off                      */
  68 #define RTC_PIE_ON      _IO('p', 0x05)  /* Periodic int. enable on      */
  69 #define RTC_PIE_OFF     _IO('p', 0x06)  /* ... off                      */
  70 #define RTC_WIE_ON      _IO('p', 0x0f)  /* Watchdog int. enable on      */
  71 #define RTC_WIE_OFF     _IO('p', 0x10)  /* ... off                      */
  72
  73 #define RTC_ALM_SET     _IOW('p', 0x07, struct linux_rtc_time) /* Set alarm time  */
  74 #define RTC_ALM_READ    _IOR('p', 0x08, struct linux_rtc_time) /* Read alarm time */
  75 #define RTC_RD_TIME     _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time   */
  76 #define RTC_SET_TIME    _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time    */
  77 #define RTC_IRQP_READ   _IOR('p', 0x0b, unsigned long)   /* Read IRQ rate   */
  78 #define RTC_IRQP_SET    _IOW('p', 0x0c, unsigned long)   /* Set IRQ rate    */
  79 #define RTC_EPOCH_READ  _IOR('p', 0x0d, unsigned long)   /* Read epoch      */
  80 #define RTC_EPOCH_SET   _IOW('p', 0x0e, unsigned long)   /* Set epoch       */
  81
  82 #define RTC_WKALM_SET   _IOW('p', 0x0f, struct linux_rtc_wkalrm)/* Set wakeup alarm*/
  83 #define RTC_WKALM_RD    _IOR('p', 0x10, struct linux_rtc_wkalrm)/* Get wakeup alarm*/
  84
  85 #define RTC_PARAM_GET   _IOW('p', 0x13, struct rtc_param)  /* Get parameter */
  86 #define RTC_PARAM_SET   _IOW('p', 0x14, struct rtc_param)  /* Set parameter */
  87
  88 /* interrupt flags */
  89 #define RTC_IRQF 0x80 /* any of the following is active */
  90 #define RTC_PF 0x40
  91 #define RTC_AF 0x20
  92 #define RTC_UF 0x10
  93
  94 #define RTC_PARAM_FEATURES           0
  95 #define RTC_PARAM_CORRECTION         1
  96 #define RTC_PARAM_BACKUP_SWITCH_MODE 2
  97
  98 POP_SAVED_FUNCTION_VISIBILITY
  99
 100 #endif