f699c92b61
During board initialization read the shared memory item SMEM_POWER_ON_STATUS_INFO and place it in the procfs at /proc/sys/kernel/boot_reason The data item is an integer with a bit being set to identify the reason the device was powered on. The values of this data item is defined in the document Document/arm/msm/boot.txt, the following is the data in the documentation file. power_on_status values set by the PMIC for power on event: ---------------------------------------------------------- 0x01 -- keyboard power on 0x02 -- RTC alarm 0x04 -- cable power on 0x08 -- SMPL 0x10 -- Watch Dog timeout 0x20 -- USB charger 0x40 -- Wall charger 0xFF -- error reading power_on_status value Change-Id: I59e665f92e6e29f7dfef4380314f676a2d92c94b Signed-off-by: Rick Adams <rgadams@codeaurora.org>
24 lines
811 B
Plaintext
24 lines
811 B
Plaintext
Introduction
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=============
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The power management integrated circuit (PMIC) records the reason the
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Application processor was powered on in Shared Memory.
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The hardware and software used is the shared memory interface. This document
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is not for the purpose of describing this interface, but to identify the
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possible values for this data item.
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Description
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===========
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Shared memory item (SMEM_POWER_ON_STATUS_INFO) is read to get access to
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this data. The table below identifies the possible values stored.
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power_on_status values set by the PMIC for power on event:
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----------------------------------------------------------
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0x01 -- keyboard power on
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0x02 -- RTC alarm
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0x04 -- cable power on
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0x08 -- SMPL
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0x10 -- Watch Dog timeout
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0x20 -- USB charger
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0x40 -- Wall charger
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0xFF -- error reading power_on_status value
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