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The _TTS object is defined in the section 7.3 of acpi 3.0b spec. The _TTS control method is executed by the OSPM at the beginning of the sleep transition process for S1,S2, S3, S4, and orderly S5 shutdown. OS will invoke _TTS before it has notified any native mode device drivers of the sleep state transition. The target sleeping state value is passed to the _TTS control method. The _TTS control method is also executed by the OSPM at the end of any sleep transition process when the system transitions to S0 from S1, S2, S3, or S4. The _TTS object should be evaluated after it has notified any native mode device drivers of the end of the sleep state transition. The working state value (0) is passed to the _TTS control method. So it is necessary to add the support for _TTS object. The _TTS object will be evaluated if it exists. At the same time a block notifier is added to the reboot notifier list so that the _TTS object will also be evaluated when the system shutdown. lenb: note that as of Sep 2008, I've not yet seen _TTS in any shipping BIOS. So this patch is to future-proof Linux, rather than fix the installed base. http://bugzilla.kernel.org/show_bug.cgi?id=11132 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Li Shaohua <shaohua.li@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com> |
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sleep.h | ||
wakeup.c |