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_ */ |
153 | |