| .. | .. |
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| 33 | 33 | Requires a separate RTC_PIE_ON call to enable the periodic |
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| 34 | 34 | interrupts. |
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| 35 | 35 | |
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| 36 | + * RTC_VL_READ: Read the voltage inputs status of the RTC when |
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| 37 | + supported. The value is a bit field of RTC_VL_*, giving the |
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| 38 | + status of the main and backup voltages. |
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| 39 | + |
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| 40 | + * RTC_VL_CLEAR: Clear the voltage status of the RTC. Some RTCs |
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| 41 | + need user interaction when the backup power provider is |
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| 42 | + replaced or charged to be able to clear the status. |
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| 43 | + |
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| 36 | 44 | The ioctl() calls supported by the older /dev/rtc interface are |
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| 37 | 45 | also supported by the newer RTC class framework. However, |
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| 38 | 46 | because the chips and systems are not standardized, some PC/AT |
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