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rtc-cdev

rtc-cdev 2.0 KB
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  1. What:		/dev/rtcX
    2. 

  2. Date:		April 2005
    3. 

  3. KernelVersion:	2.6.12
    4. 

  4. Contact:	[email protected]
    5. 

  5. Description:
    6. 

  6. 		The ioctl interface to drivers for real-time clocks (RTCs).
    7. 

  7. 		Following actions are supported:
    8. 

  8. 

  9. 		* RTC_RD_TIME, RTC_SET_TIME: Read or set the RTC time. Time
    10. 

  10. 		  format is a Gregorian calendar date and 24 hour wall clock
    11. 

  11. 		  time.
    12. 

  12. 

  13. 		* RTC_AIE_ON, RTC_AIE_OFF: Enable or disable the alarm interrupt
    14. 

  14. 		  for RTCs that support alarms
    15. 

  15. 

  16. 		* RTC_ALM_READ, RTC_ALM_SET: Read or set the alarm time for
    17. 

  17. 		  RTCs that support alarms. Can be set upto 24 hours in the
    18. 

  18. 		  future. Requires a separate RTC_AIE_ON call to enable the
    19. 

  19. 		  alarm interrupt. (Prefer to use RTC_WKALM_*)
    20. 

  20. 

  21. 		* RTC_WKALM_RD, RTC_WKALM_SET: For RTCs that support a more
    22. 

  22. 		  powerful interface, which can issue alarms beyond 24 hours and
    23. 

  23. 		  enable IRQs in the same request.
    24. 

  24. 

  25. 		* RTC_PIE_ON, RTC_PIE_OFF: Enable or disable the periodic
    26. 

  26. 		  interrupt for RTCs that support periodic interrupts.
    27. 

  27. 

  28. 		* RTC_UIE_ON, RTC_UIE_OFF: Enable or disable the update
    29. 

  29. 		  interrupt for RTCs that support it.
    30. 

  30. 

  31. 		* RTC_IRQP_READ, RTC_IRQP_SET: Read or set the frequency for
    32. 

  32. 		  periodic interrupts for RTCs that support periodic interrupts.
    33. 

  33. 		  Requires a separate RTC_PIE_ON call to enable the periodic
    34. 

  34. 		  interrupts.
    35. 

  35. 

  36. 		* RTC_VL_READ: Read the voltage inputs status of the RTC when
    37. 

  37. 		  supported. The value is a bit field of RTC_VL_*, giving the
    38. 

  38. 		  status of the main and backup voltages.
    39. 

  39. 

  40. 		* RTC_VL_CLEAR: Clear the voltage status of the RTC. Some RTCs
    41. 

  41. 		  need user interaction when the backup power provider is
    42. 

  42. 		  replaced or charged to be able to clear the status.
    43. 

  43. 

  44. 		The ioctl() calls supported by the older /dev/rtc interface are
    45. 

  45. 		also supported by the newer RTC class framework. However,
    46. 

  46. 		because the chips and systems are not standardized, some PC/AT
    47. 

  47. 		functionality might not be provided. And in the same way, some
    48. 

  48. 		newer features -- including those enabled by ACPI -- are exposed
    49. 

  49. 		by the RTC class framework, but can't be supported by the older
    50. 

  50. 		driver.
    51.