2 * Generic RTC interface.
3 * This version contains the part of the user interface to the Real Time Clock
4 * service. It is used with both the legacy mc146818 and also EFI
5 * Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
6 * from <linux/mc146818rtc.h> to this file for 2.4 kernels.
8 * Copyright (C) 1999 Hewlett-Packard Co.
9 * Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
14 #include <linux/interrupt.h>
17 * The struct used to pass data via the following ioctl. Similar to the
18 * struct tm in <time.h>, but it needs to be here so that the kernel
19 * source is self contained, allowing cross-compiles, etc. etc.
35 * This data structure is inspired by the EFI (v0.92) wakeup
39 unsigned char enabled; /* 0 = alarm disable, 1 = alarm disabled */
40 unsigned char pending; /* 0 = alarm pending, 1 = alarm not pending */
41 struct rtc_time time; /* time the alarm is set to */
45 * Data structure to control PLL correction some better RTC feature
46 * pll_value is used to get or set current value of correction,
47 * the rest of the struct is used to query HW capabilities.
48 * This is modeled after the RTC used in Q40/Q60 computers but
49 * should be sufficiently flexible for other devices
51 * +ve pll_value means clock will run faster by
52 * pll_value*pll_posmult/pll_clock
53 * -ve pll_value means clock will run slower by
54 * pll_value*pll_negmult/pll_clock
58 int pll_ctrl; /* placeholder for fancier control */
59 int pll_value; /* get/set correction value */
60 int pll_max; /* max +ve (faster) adjustment value */
61 int pll_min; /* max -ve (slower) adjustment value */
62 int pll_posmult; /* factor for +ve correction */
63 int pll_negmult; /* factor for -ve correction */
64 long pll_clock; /* base PLL frequency */
68 * ioctl calls that are permitted to the /dev/rtc interface, if
69 * any of the RTC drivers are enabled.
72 #define RTC_AIE_ON _IO('p', 0x01) /* Alarm int. enable on */
73 #define RTC_AIE_OFF _IO('p', 0x02) /* ... off */
74 #define RTC_UIE_ON _IO('p', 0x03) /* Update int. enable on */
75 #define RTC_UIE_OFF _IO('p', 0x04) /* ... off */
76 #define RTC_PIE_ON _IO('p', 0x05) /* Periodic int. enable on */
77 #define RTC_PIE_OFF _IO('p', 0x06) /* ... off */
78 #define RTC_WIE_ON _IO('p', 0x0f) /* Watchdog int. enable on */
79 #define RTC_WIE_OFF _IO('p', 0x10) /* ... off */
81 #define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time) /* Set alarm time */
82 #define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
83 #define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time) /* Read RTC time */
84 #define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time) /* Set RTC time */
85 #define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long) /* Read IRQ rate */
86 #define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long) /* Set IRQ rate */
87 #define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long) /* Read epoch */
88 #define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long) /* Set epoch */
90 #define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
91 #define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/
93 #define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */
94 #define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */
98 typedef struct rtc_task {
99 void (*func)(void *private_data);
103 int rtc_register(rtc_task_t *task);
104 int rtc_unregister(rtc_task_t *task);
105 int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
106 void rtc_get_rtc_time(struct rtc_time *rtc_tm);
107 irqreturn_t rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs);
109 #endif /* __KERNEL__ */
111 #endif /* _LINUX_RTC_H_ */