Quelle rtc.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Generic RTC interface.
* This version contains the part of the user interface to the Real Time Clock
* service. It is used with both the legacy mc146818 and also  EFI
* Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
* from <linux/mc146818rtc.h> to this file for 2.4 kernels.
*
* Copyright (C) 1999 Hewlett-Packard Co.
* Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
*/
#ifndef _UAPI_LINUX_RTC_H_
#define _UAPI_LINUX_RTC_H_

#include <linux/const.h>
#include <linux/ioctl.h>
#include <linux/types.h>

/*
* The struct used to pass data via the following ioctl. Similar to the
* struct tm in <time.h>, but it needs to be here so that the kernel
* source is self contained, allowing cross-compiles, etc. etc.
*/

struct rtc_time {
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
};

/*
* This data structure is inspired by the EFI (v0.92) wakeup
* alarm API.
*/
struct rtc_wkalrm {
unsigned char enabled; /* 0 = alarm disabled, 1 = alarm enabled */
unsigned char pending;  /* 0 = alarm not pending, 1 = alarm pending */
struct rtc_time time; /* time the alarm is set to */
};

/*
* Data structure to control PLL correction some better RTC feature
* pll_value is used to get or set current value of correction,
* the rest of the struct is used to query HW capabilities.
* This is modeled after the RTC used in Q40/Q60 computers but
* should be sufficiently flexible for other devices
*
* +ve pll_value means clock will run faster by
*   pll_value*pll_posmult/pll_clock
* -ve pll_value means clock will run slower by
*   pll_value*pll_negmult/pll_clock
*/

struct rtc_pll_info {
int pll_ctrl;       /* placeholder for fancier control */
int pll_value;      /* get/set correction value */
int pll_max;        /* max +ve (faster) adjustment value */
int pll_min;        /* max -ve (slower) adjustment value */
int pll_posmult;    /* factor for +ve correction */
int pll_negmult;    /* factor for -ve correction */
long pll_clock;     /* base PLL frequency */
};

struct rtc_param {
__u64 param;
union {
  __u64 uvalue;
  __s64 svalue;
  __u64 ptr;
};
__u32 index;
__u32 __pad;
};

/*
* ioctl calls that are permitted to the /dev/rtc interface, if
* any of the RTC drivers are enabled.
*/

#define RTC_AIE_ON _IO('p', 0x01) /* Alarm int. enable on */
#define RTC_AIE_OFF _IO('p', 0x02) /* ... off */
#define RTC_UIE_ON _IO('p', 0x03) /* Update int. enable on */
#define RTC_UIE_OFF _IO('p', 0x04) /* ... off */
#define RTC_PIE_ON _IO('p', 0x05) /* Periodic int. enable on */
#define RTC_PIE_OFF _IO('p', 0x06) /* ... off */
#define RTC_WIE_ON _IO('p', 0x0f)  /* Watchdog int. enable on */
#define RTC_WIE_OFF _IO('p', 0x10)  /* ... off */

#define RTC_ALM_SET _IOW('p', 0x07, struct rtc_time) /* Set alarm time  */
#define RTC_ALM_READ _IOR('p', 0x08, struct rtc_time) /* Read alarm time */
#define RTC_RD_TIME _IOR('p', 0x09, struct rtc_time) /* Read RTC time   */
#define RTC_SET_TIME _IOW('p', 0x0a, struct rtc_time) /* Set RTC time    */
#define RTC_IRQP_READ _IOR('p', 0x0b, unsigned long)  /* Read IRQ rate   */
#define RTC_IRQP_SET _IOW('p', 0x0c, unsigned long)  /* Set IRQ rate    */
#define RTC_EPOCH_READ _IOR('p', 0x0d, unsigned long)  /* Read epoch      */
#define RTC_EPOCH_SET _IOW('p', 0x0e, unsigned long)  /* Set epoch       */

#define RTC_WKALM_SET _IOW('p', 0x0f, struct rtc_wkalrm)/* Set wakeup alarm*/
#define RTC_WKALM_RD _IOR('p', 0x10, struct rtc_wkalrm)/* Get wakeup alarm*/

#define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info)  /* Get PLL correction */
#define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info)  /* Set PLL correction */

#define RTC_PARAM_GET _IOW('p', 0x13, struct rtc_param)  /* Get parameter */
#define RTC_PARAM_SET _IOW('p', 0x14, struct rtc_param)  /* Set parameter */

#define RTC_VL_DATA_INVALID _BITUL(0) /* Voltage too low, RTC data is invalid */
#define RTC_VL_BACKUP_LOW _BITUL(1) /* Backup voltage is low */
#define RTC_VL_BACKUP_EMPTY _BITUL(2) /* Backup empty or not present */
#define RTC_VL_ACCURACY_LOW _BITUL(3) /* Voltage is low, RTC accuracy is reduced */
#define RTC_VL_BACKUP_SWITCH _BITUL(4) /* Backup switchover happened */

#define RTC_VL_READ _IOR('p', 0x13, unsigned int) /* Voltage low detection */
#define RTC_VL_CLR _IO('p', 0x14)  /* Clear voltage low information */

/* interrupt flags */
#define RTC_IRQF 0x80 /* Any of the following is active */
#define RTC_PF 0x40 /* Periodic interrupt */
#define RTC_AF 0x20 /* Alarm interrupt */
#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */

/* feature list */
#define RTC_FEATURE_ALARM  0
#define RTC_FEATURE_ALARM_RES_MINUTE 1
#define RTC_FEATURE_NEED_WEEK_DAY 2
#define RTC_FEATURE_ALARM_RES_2S 3
#define RTC_FEATURE_UPDATE_INTERRUPT 4
#define RTC_FEATURE_CORRECTION  5
#define RTC_FEATURE_BACKUP_SWITCH_MODE 6
#define RTC_FEATURE_ALARM_WAKEUP_ONLY 7
#define RTC_FEATURE_CNT   8

/* parameter list */
#define RTC_PARAM_FEATURES  0
#define RTC_PARAM_CORRECTION  1
#define RTC_PARAM_BACKUP_SWITCH_MODE 2

#define RTC_BSM_DISABLED 0
#define RTC_BSM_DIRECT  1
#define RTC_BSM_LEVEL  2
#define RTC_BSM_STANDBY  3

#define RTC_MAX_FREQ 8192

#endif /* _UAPI_LINUX_RTC_H_ */

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