1		ACPI Time and Alarm (TAD) device attributes.
2
3What:		/sys/bus/platform/devices/ACPI000E:00/caps
4Date:		March 2018
5Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
6Description:
7		(RO) Hexadecimal bitmask of the TAD attributes are reported by
8		the platform firmware (see ACPI 6.2, section 9.18.2):
9
10		======= ======================================================
11		BIT(0): AC wakeup implemented if set
12		BIT(1): DC wakeup implemented if set
13		BIT(2): Get/set real time features implemented if set
14		BIT(3): Real time accuracy in milliseconds if set
15		BIT(4): Correct status reported for wakeups from S4/S5 if set
16		BIT(5): The AC timer wakes up from S4 if set
17		BIT(6): The AC timer wakes up from S5 if set
18		BIT(7): The DC timer wakes up from S4 if set
19		BIT(8): The DC timer wakes up from S5 if set
20		======= ======================================================
21
22		The other bits are reserved.
23
24What:		/sys/bus/platform/devices/ACPI000E:00/ac_alarm
25Date:		March 2018
26Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
27Description:
28		(RW) The AC alarm timer value.
29
30		Reads return the current AC alarm timer value in seconds or
31		"disabled", if the AC alarm is not set to wake up the system.
32
33		Write a new AC alarm timer value in seconds or "disabled" to it
34		to set the AC alarm timer or to disable it, respectively.
35
36		If the AC alarm timer is set through this attribute and it
37		expires, it will immediately wake up the system from the S3
38		sleep state (and from S4/S5 too if supported) until its status
39		is explicitly cleared via the ac_status attribute.
40
41What:		/sys/bus/platform/devices/ACPI000E:00/ac_policy
42Date:		March 2018
43Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
44Description:
45		(RW) The AC alarm expired timer wake policy (see ACPI 6.2,
46		Section 9.18 for details).
47
48		Reads return the current expired timer wake delay for the AC
49		alarm timer or "never", if the policy is to discard AC timer
50		wakeups if the system is on DC power.
51
52		Write a new expired timer wake delay for the AC alarm timer in
53		seconds or "never" to it to set the expired timer wake delay for
54		the AC alarm timer or to set its expired wake policy to discard
55		wakeups if the system is on DC power, respectively.
56
57What:		/sys/bus/platform/devices/ACPI000E:00/ac_status
58Date:		March 2018
59Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
60Description:
61		(RW) The AC alarm status.
62
63		Reads return a hexadecimal bitmask representing the AC alarm
64		timer status with the following meaning of bits (see ACPI 6.2,
65		Section 9.18.5):
66
67		======= ======================================================
68		Bit(0): The timer has expired if set.
69		Bit(1): The timer has woken up the system from a sleep state
70		        (S3 or S4/S5 if supported) if set.
71		======= ======================================================
72
73		The other bits are reserved.
74
75		Reads also cause the AC alarm timer status to be reset.
76
77		Another way to reset the the status of the AC alarm timer is to
78		write (the number) 0 to this file.
79
80		If the status return value indicates that the timer has expired,
81		it will immediately wake up the system from the S3 sleep state
82		(and from S4/S5 too if supported) until its status is explicitly
83		cleared through this attribute.
84
85What:		/sys/bus/platform/devices/ACPI000E:00/dc_alarm
86Date:		March 2018
87Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
88Description:
89		(RW,optional) The DC alarm timer value.
90
91		This attribute is only present if the TAD supports a separate
92		DC timer.
93
94		It is analogous to the ac_alarm attribute.
95
96What:		/sys/bus/platform/devices/ACPI000E:00/dc_policy
97Date:		March 2018
98Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
99Description:
100		(RW,optional) The DC alarm expired timer wake policy.
101
102		This attribute is only present if the TAD supports a separate
103		DC timer.
104
105		It is analogous to the ac_policy attribute.
106
107What:		/sys/bus/platform/devices/ACPI000E:00/dc_status
108Date:		March 2018
109Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
110
111Description:
112		(RW,optional) The DC alarm status.
113
114		This attribute is only present if the TAD supports a separate
115		DC timer.
116
117		It is analogous to the ac_status attribute.
118