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kernel/linux-imx6_3.14.28/include/uapi/linux/rtc.h 3.87 KB
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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 _UAPI_LINUX_RTC_H_
  #define _UAPI_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 */
  
  #define RTC_VL_READ	_IOR('p', 0x13, int)	/* Voltage low detector */
  #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 */
  
  
  #define RTC_MAX_FREQ	8192
  
  
  #endif /* _UAPI_LINUX_RTC_H_ */