include/uapi/linux/rtc.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   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.
   8  *
   9  * Copyright (C) 1999 Hewlett-Packard Co.
  10  * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
  11  */
  12 #ifndef _UAPI_LINUX_RTC_H_
  13 #define _UAPI_LINUX_RTC_H_
  14
  15 /*
  16  * The struct used to pass data via the following ioctl. Similar to the
  17  * struct tm in <time.h>, but it needs to be here so that the kernel
  18  * source is self contained, allowing cross-compiles, etc. etc.
  19  */
  20
  21 struct rtc_time {
  22         int tm_sec;
  23         int tm_min;
  24         int tm_hour;
  25         int tm_mday;
  26         int tm_mon;
  27         int tm_year;
  28         int tm_wday;
  29         int tm_yday;
  30         int tm_isdst;
  31 };
  32
  33 /*
  34  * This data structure is inspired by the EFI (v0.92) wakeup
  35  * alarm API.
  36  */
  37 struct rtc_wkalrm {
  38         unsigned char enabled;  /* 0 = alarm disabled, 1 = alarm enabled */
  39         unsigned char pending;  /* 0 = alarm not pending, 1 = alarm pending */
  40         struct rtc_time time;   /* time the alarm is set to */
  41 };
  42
  43 /*
  44  * Data structure to control PLL correction some better RTC feature
  45  * pll_value is used to get or set current value of correction,
  46  * the rest of the struct is used to query HW capabilities.
  47  * This is modeled after the RTC used in Q40/Q60 computers but
  48  * should be sufficiently flexible for other devices
  49  *
  50  * +ve pll_value means clock will run faster by
  51  *   pll_value*pll_posmult/pll_clock
  52  * -ve pll_value means clock will run slower by
  53  *   pll_value*pll_negmult/pll_clock
  54  */
  55
  56 struct rtc_pll_info {
  57         int pll_ctrl;       /* placeholder for fancier control */
  58         int pll_value;      /* get/set correction value */
  59         int pll_max;        /* max +ve (faster) adjustment value */
  60         int pll_min;        /* max -ve (slower) adjustment value */
  61         int pll_posmult;    /* factor for +ve correction */
  62         int pll_negmult;    /* factor for -ve correction */
  63         long pll_clock;     /* base PLL frequency */
  64 };
  65
  66 /*
  67  * ioctl calls that are permitted to the /dev/rtc interface, if
  68  * any of the RTC drivers are enabled.
  69  */
  70
  71 #define RTC_AIE_ON      _IO('p', 0x01)  /* Alarm int. enable on         */
  72 #define RTC_AIE_OFF     _IO('p', 0x02)  /* ... off                      */
  73 #define RTC_UIE_ON      _IO('p', 0x03)  /* Update int. enable on        */
  74 #define RTC_UIE_OFF     _IO('p', 0x04)  /* ... off                      */
  75 #define RTC_PIE_ON      _IO('p', 0x05)  /* Periodic int. enable on      */
  76 #define RTC_PIE_OFF     _IO('p', 0x06)  /* ... off                      */
  77 #define RTC_WIE_ON      _IO('p', 0x0f)  /* Watchdog int. enable on      */
  78 #define RTC_WIE_OFF     _IO('p', 0x10)  /* ... off                      */
  79
  80 #define RTC_ALM_SET     _IOW('p', 0x07, struct rtc_time) /* Set alarm time  */
  81 #define RTC_ALM_READ    _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
  82 #define RTC_RD_TIME     _IOR('p', 0x09, struct rtc_time) /* Read RTC time   */
  83 #define RTC_SET_TIME    _IOW('p', 0x0a, struct rtc_time) /* Set RTC time    */
  84 #define RTC_IRQP_READ   _IOR('p', 0x0b, unsigned long)   /* Read IRQ rate   */
  85 #define RTC_IRQP_SET    _IOW('p', 0x0c, unsigned long)   /* Set IRQ rate    */
  86 #define RTC_EPOCH_READ  _IOR('p', 0x0d, unsigned long)   /* Read epoch      */
  87 #define RTC_EPOCH_SET   _IOW('p', 0x0e, unsigned long)   /* Set epoch       */
  88
  89 #define RTC_WKALM_SET   _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
  90 #define RTC_WKALM_RD    _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
  91
  92 #define RTC_PLL_GET     _IOR('p', 0x11, struct rtc_pll_info)  /* Get PLL correction */
  93 #define RTC_PLL_SET     _IOW('p', 0x12, struct rtc_pll_info)  /* Set PLL correction */
  94
  95 #define RTC_VL_READ     _IOR('p', 0x13, int)    /* Voltage low detector */
  96 #define RTC_VL_CLR      _IO('p', 0x14)          /* Clear voltage low information */
  97
  98 /* interrupt flags */
  99 #define RTC_IRQF 0x80   /* Any of the following is active */
 100 #define RTC_PF 0x40     /* Periodic interrupt */
 101 #define RTC_AF 0x20     /* Alarm interrupt */
 102 #define RTC_UF 0x10     /* Update interrupt for 1Hz RTC */
 103
 104
 105 #define RTC_MAX_FREQ    8192
 106
 107
 108 #endif /* _UAPI_LINUX_RTC_H_ */