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