1 What: /dev/rtcX
2 Date: April 2005
3 KernelVersion: 2.6.12
4 Contact: linux-rtc@vger.kernel.org
5 Description:
6 The ioctl interface to drivers
7 Following actions are supporte
8
9 * RTC_RD_TIME, RTC_SET_TIME: R
10 format is a Gregorian calend
11 time.
12
13 * RTC_AIE_ON, RTC_AIE_OFF: Ena
14 for RTCs that support alarms
15
16 * RTC_ALM_READ, RTC_ALM_SET: R
17 RTCs that support alarms. Ca
18 future. Requires a separate
19 alarm interrupt. (Prefer to
20
21 * RTC_WKALM_RD, RTC_WKALM_SET:
22 powerful interface, which ca
23 enable IRQs in the same requ
24
25 * RTC_PIE_ON, RTC_PIE_OFF: Ena
26 interrupt for RTCs that supp
27
28 * RTC_UIE_ON, RTC_UIE_OFF: Ena
29 interrupt for RTCs that supp
30
31 * RTC_IRQP_READ, RTC_IRQP_SET:
32 periodic interrupts for RTCs
33 Requires a separate RTC_PIE_
34 interrupts.
35
36 * RTC_VL_READ: Read the voltag
37 supported. The value is a bi
38 status of the main and backu
39
40 * RTC_VL_CLEAR: Clear the volt
41 need user interaction when t
42 replaced or charged to be ab
43
44 The ioctl() calls supported by
45 also supported by the newer RT
46 because the chips and systems
47 functionality might not be pro
48 newer features -- including th
49 by the RTC class framework, bu
50 driver.
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