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/*

 * 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

#ifdef __KERNEL__

#include <linux/interrupt.h>

extern int rtc_month_days(unsigned int month, unsigned int year);

extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);

extern int rtc_valid_tm(struct rtc_time *tm);

extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);

extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);

#include <linux/device.h>

#include <linux/seq_file.h>

#include <linux/cdev.h>

#include <linux/poll.h>

#include <linux/mutex.h>

extern struct class *rtc_class;

struct rtc_class_ops {

        int (*open)(struct device *);

        void (*release)(struct device *);

        int (*ioctl)(struct device *, unsigned int, unsigned long);

        int (*read_time)(struct device *, struct rtc_time *);

        int (*set_time)(struct device *, struct rtc_time *);

        int (*read_alarm)(struct device *, struct rtc_wkalrm *);

        int (*set_alarm)(struct device *, struct rtc_wkalrm *);

        int (*proc)(struct device *, struct seq_file *);

        int (*set_mmss)(struct device *, unsigned long secs);

        int (*irq_set_state)(struct device *, int enabled);

        int (*irq_set_freq)(struct device *, int freq);

        int (*read_callback)(struct device *, int data);

};

#define RTC_DEVICE_NAME_SIZE 20

struct rtc_task;

/* flags */

#define RTC_DEV_BUSY 0

struct rtc_device

{

        struct device dev;

        struct module *owner;

        int id;

        char name[RTC_DEVICE_NAME_SIZE];

        const struct rtc_class_ops *ops;

        struct mutex ops_lock;

        struct cdev char_dev;

        unsigned long flags;

        unsigned long irq_data;

        spinlock_t irq_lock;

        wait_queue_head_t irq_queue;

        struct fasync_struct *async_queue;

        struct rtc_task *irq_task;

        spinlock_t irq_task_lock;

        int irq_freq;

        int max_user_freq;

#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL

        struct work_struct uie_task;

        struct timer_list uie_timer;

        /* Those fields are protected by rtc->irq_lock */

        unsigned int oldsecs;

        unsigned int irq_active:1;

        unsigned int stop_uie_polling:1;

        unsigned int uie_task_active:1;

        unsigned int uie_timer_active:1;

#endif

};

#define to_rtc_device(d) container_of(d, struct rtc_device, dev)

extern struct rtc_device *rtc_device_register(const char *name,

                                        struct device *dev,

                                        const struct rtc_class_ops *ops,

                                        struct module *owner);

extern void rtc_device_unregister(struct rtc_device *rtc);

extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);

extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);

extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);

extern int rtc_read_alarm(struct rtc_device *rtc,

                        struct rtc_wkalrm *alrm);

extern int rtc_set_alarm(struct rtc_device *rtc,

                                struct rtc_wkalrm *alrm);

extern void rtc_update_irq(struct rtc_device *rtc,

                        unsigned long num, unsigned long events);

extern struct rtc_device *rtc_class_open(char *name);

extern void rtc_class_close(struct rtc_device *rtc);

extern int rtc_irq_register(struct rtc_device *rtc,

                                struct rtc_task *task);

extern void rtc_irq_unregister(struct rtc_device *rtc,

                                struct rtc_task *task);

extern int rtc_irq_set_state(struct rtc_device *rtc,

                                struct rtc_task *task, int enabled);

extern int rtc_irq_set_freq(struct rtc_device *rtc,

                                struct rtc_task *task, int freq);

typedef struct rtc_task {

        void (*func)(void *private_data);

        void *private_data;

} rtc_task_t;

int rtc_register(rtc_task_t *task);

int rtc_unregister(rtc_task_t *task);

int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);

void rtc_get_rtc_time(struct rtc_time *rtc_tm);

irqreturn_t rtc_interrupt(int irq, void *dev_id);

#endif /* __KERNEL__ */

#endif /* _LINUX_RTC_H_ */