diff options
Diffstat (limited to 'include/linux/rtc.h')
| -rw-r--r-- | include/linux/rtc.h | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/include/linux/rtc.h b/include/linux/rtc.h new file mode 100644 index 00000000000..60f88a7fb13 --- /dev/null +++ b/include/linux/rtc.h @@ -0,0 +1,243 @@ +/* + * 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/types.h> +#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; + +/* + * For these RTC methods the device parameter is the physical device + * on whatever bus holds the hardware (I2C, Platform, SPI, etc), which + * was passed to rtc_device_register(). Its driver_data normally holds + * device state, including the rtc_device pointer for the RTC. + * + * Most of these methods are called with rtc_device.ops_lock held, + * through the rtc_*(struct rtc_device *, ...) calls. + * + * The (current) exceptions are mostly filesystem hooks: + * - the proc() hook for procfs + * - non-ioctl() chardev hooks: open(), release(), read_callback() + * - periodic irq calls: irq_set_state(), irq_set_freq() + * + * REVISIT those periodic irq calls *do* have ops_lock when they're + * issued through ioctl() ... + */ +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); + int (*alarm_irq_enable)(struct device *, unsigned int enabled); + int (*update_irq_enable)(struct device *, unsigned int enabled); +}; + +#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 uie_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); +extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled); +extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled); +extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, + unsigned int enabled); + +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); + +static inline bool is_leap_year(unsigned int year) +{ + return (!(year % 4) && (year % 100)) || !(year % 400); +} + +#endif /* __KERNEL__ */ + +#endif /* _LINUX_RTC_H_ */ |