/*
 * 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 _LINUX_RTC_H_
#define _LINUX_RTC_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 */
};

/*
 * 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 */

/* interrupt flags */
#define RTC_IRQF 0x80 /* any of the following is active */
#define RTC_PF 0x40
#define RTC_AF 0x20
#define RTC_UF 0x10


#endif /* _LINUX_RTC_H_ */