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 #include <linux/const.h>
  16 #include <linux/ioctl.h>
  17 #include <linux/types.h>
  18
  19 /*
  20  * The struct used to pass data via the following ioctl. Similar to the
  21  * struct tm in <time.h>, but it needs to be here so that the kernel
  22  * source is self contained, allowing cross-compiles, etc. etc.
  23  */
  24
  25 struct rtc_time {
  26         int tm_sec;
  27         int tm_min;
  28         int tm_hour;
  29         int tm_mday;
  30         int tm_mon;
  31         int tm_year;
  32         int tm_wday;
  33         int tm_yday;
  34         int tm_isdst;
  35 };
  36
  37 /*
  38  * This data structure is inspired by the EFI (v0.92) wakeup
  39  * alarm API.
  40  */
  41 struct rtc_wkalrm {
  42         unsigned char enabled;  /* 0 = alarm disabled, 1 = alarm enabled */
  43         unsigned char pending;  /* 0 = alarm not pending, 1 = alarm pending */
  44         struct rtc_time time;   /* time the alarm is set to */
  45 };
  46
  47 /*
  48  * Data structure to control PLL correction some better RTC feature
  49  * pll_value is used to get or set current value of correction,
  50  * the rest of the struct is used to query HW capabilities.
  51  * This is modeled after the RTC used in Q40/Q60 computers but
  52  * should be sufficiently flexible for other devices
  53  *
  54  * +ve pll_value means clock will run faster by
  55  *   pll_value*pll_posmult/pll_clock
  56  * -ve pll_value means clock will run slower by
  57  *   pll_value*pll_negmult/pll_clock
  58  */
  59
  60 struct rtc_pll_info {
  61         int pll_ctrl;       /* placeholder for fancier control */
  62         int pll_value;      /* get/set correction value */
  63         int pll_max;        /* max +ve (faster) adjustment value */
  64         int pll_min;        /* max -ve (slower) adjustment value */
  65         int pll_posmult;    /* factor for +ve correction */
  66         int pll_negmult;    /* factor for -ve correction */
  67         long pll_clock;     /* base PLL frequency */
  68 };
  69
  70 struct rtc_param {
  71         __u64 param;
  72         union {
  73                 __u64 uvalue;
  74                 __s64 svalue;
  75                 __u64 ptr;
  76         };
  77         __u32 index;
  78         __u32 __pad;
  79 };
  80
  81 /*
  82  * ioctl calls that are permitted to the /dev/rtc interface, if
  83  * any of the RTC drivers are enabled.
  84  */
  85
  86 #define RTC_AIE_ON      _IO('p', 0x01)  /* Alarm int. enable on         */
  87 #define RTC_AIE_OFF     _IO('p', 0x02)  /* ... off                      */
  88 #define RTC_UIE_ON      _IO('p', 0x03)  /* Update int. enable on        */
  89 #define RTC_UIE_OFF     _IO('p', 0x04)  /* ... off                      */
  90 #define RTC_PIE_ON      _IO('p', 0x05)  /* Periodic int. enable on      */
  91 #define RTC_PIE_OFF     _IO('p', 0x06)  /* ... off                      */
  92 #define RTC_WIE_ON      _IO('p', 0x0f)  /* Watchdog int. enable on      */
  93 #define RTC_WIE_OFF     _IO('p', 0x10)  /* ... off                      */
  94
  95 #define RTC_ALM_SET     _IOW('p', 0x07, struct rtc_time) /* Set alarm time  */
  96 #define RTC_ALM_READ    _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
  97 #define RTC_RD_TIME     _IOR('p', 0x09, struct rtc_time) /* Read RTC time   */
  98 #define RTC_SET_TIME    _IOW('p', 0x0a, struct rtc_time) /* Set RTC time    */
  99 #define RTC_IRQP_READ   _IOR('p', 0x0b, unsigned long)   /* Read IRQ rate   */
 100 #define RTC_IRQP_SET    _IOW('p', 0x0c, unsigned long)   /* Set IRQ rate    */
 101 #define RTC_EPOCH_READ  _IOR('p', 0x0d, unsigned long)   /* Read epoch      */
 102 #define RTC_EPOCH_SET   _IOW('p', 0x0e, unsigned long)   /* Set epoch       */
 103
 104 #define RTC_WKALM_SET   _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
 105 #define RTC_WKALM_RD    _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
 106
 107 #define RTC_PLL_GET     _IOR('p', 0x11, struct rtc_pll_info)  /* Get PLL correction */
 108 #define RTC_PLL_SET     _IOW('p', 0x12, struct rtc_pll_info)  /* Set PLL correction */
 109
 110 #define RTC_PARAM_GET   _IOW('p', 0x13, struct rtc_param)  /* Get parameter */
 111 #define RTC_PARAM_SET   _IOW('p', 0x14, struct rtc_param)  /* Set parameter */
 112
 113 #define RTC_VL_DATA_INVALID     _BITUL(0) /* Voltage too low, RTC data is invalid */
 114 #define RTC_VL_BACKUP_LOW       _BITUL(1) /* Backup voltage is low */
 115 #define RTC_VL_BACKUP_EMPTY     _BITUL(2) /* Backup empty or not present */
 116 #define RTC_VL_ACCURACY_LOW     _BITUL(3) /* Voltage is low, RTC accuracy is reduced */
 117 #define RTC_VL_BACKUP_SWITCH    _BITUL(4) /* Backup switchover happened */
 118
 119 #define RTC_VL_READ     _IOR('p', 0x13, unsigned int)   /* Voltage low detection */
 120 #define RTC_VL_CLR      _IO('p', 0x14)          /* Clear voltage low information */
 121
 122 /* interrupt flags */
 123 #define RTC_IRQF 0x80   /* Any of the following is active */
 124 #define RTC_PF 0x40     /* Periodic interrupt */
 125 #define RTC_AF 0x20     /* Alarm interrupt */
 126 #define RTC_UF 0x10     /* Update interrupt for 1Hz RTC */
 127
 128 /* feature list */
 129 #define RTC_FEATURE_ALARM               0
 130 #define RTC_FEATURE_ALARM_RES_MINUTE    1
 131 #define RTC_FEATURE_NEED_WEEK_DAY       2
 132 #define RTC_FEATURE_ALARM_RES_2S        3
 133 #define RTC_FEATURE_UPDATE_INTERRUPT    4
 134 #define RTC_FEATURE_CORRECTION          5
 135 #define RTC_FEATURE_BACKUP_SWITCH_MODE  6
 136 #define RTC_FEATURE_ALARM_WAKEUP_ONLY   7
 137 #define RTC_FEATURE_CNT                 8
 138
 139 /* parameter list */
 140 #define RTC_PARAM_FEATURES              0
 141 #define RTC_PARAM_CORRECTION            1
 142 #define RTC_PARAM_BACKUP_SWITCH_MODE    2
 143
 144 #define RTC_BSM_DISABLED        0
 145 #define RTC_BSM_DIRECT          1
 146 #define RTC_BSM_LEVEL           2
 147 #define RTC_BSM_STANDBY         3
 148
 149 #define RTC_MAX_FREQ    8192
 150
 151
 152 #endif /* _UAPI_LINUX_RTC_H_ */