diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-power')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-power | 165 |
1 files changed, 137 insertions, 28 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-power b/Documentation/ABI/testing/sysfs-devices-power index 8ffbc25376a..676fdf5f2a9 100644 --- a/Documentation/ABI/testing/sysfs-devices-power +++ b/Documentation/ABI/testing/sysfs-devices-power @@ -1,6 +1,6 @@ What: /sys/devices/.../power/ Date: January 2009 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../power directory contains attributes allowing the user space to check and modify some power @@ -8,7 +8,7 @@ Description: What: /sys/devices/.../power/wakeup Date: January 2009 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../power/wakeup attribute allows the user space to check if the device is enabled to wake up the system @@ -34,7 +34,7 @@ Description: What: /sys/devices/.../power/control Date: January 2009 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../power/control attribute allows the user space to control the run-time power management of the device. @@ -53,7 +53,7 @@ Description: What: /sys/devices/.../power/async Date: January 2009 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../async attribute allows the user space to enable or diasble the device's suspend and resume callbacks to @@ -79,74 +79,109 @@ Description: What: /sys/devices/.../power/wakeup_count Date: September 2010 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../wakeup_count attribute contains the number of signaled wakeup events associated with the device. This - attribute is read-only. If the device is not enabled to wake up + attribute is read-only. If the device is not capable to wake up the system from sleep states, this attribute is not present. + If the device is not enabled to wake up the system from sleep + states, this attribute is empty. What: /sys/devices/.../power/wakeup_active_count Date: September 2010 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../wakeup_active_count attribute contains the number of times the processing of wakeup events associated with the device was completed (at the kernel level). This attribute - is read-only. If the device is not enabled to wake up the - system from sleep states, this attribute is not present. + is read-only. If the device is not capable to wake up the + system from sleep states, this attribute is not present. If + the device is not enabled to wake up the system from sleep + states, this attribute is empty. -What: /sys/devices/.../power/wakeup_hit_count -Date: September 2010 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +What: /sys/devices/.../power/wakeup_abort_count +Date: February 2012 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: - The /sys/devices/.../wakeup_hit_count attribute contains the + The /sys/devices/.../wakeup_abort_count attribute contains the number of times the processing of a wakeup event associated with - the device might prevent the system from entering a sleep state. - This attribute is read-only. If the device is not enabled to - wake up the system from sleep states, this attribute is not - present. + the device might have aborted system transition into a sleep + state in progress. This attribute is read-only. If the device + is not capable to wake up the system from sleep states, this + attribute is not present. If the device is not enabled to wake + up the system from sleep states, this attribute is empty. + +What: /sys/devices/.../power/wakeup_expire_count +Date: February 2012 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> +Description: + The /sys/devices/.../wakeup_expire_count attribute contains the + number of times a wakeup event associated with the device has + been reported with a timeout that expired. This attribute is + read-only. If the device is not capable to wake up the system + from sleep states, this attribute is not present. If the + device is not enabled to wake up the system from sleep states, + this attribute is empty. What: /sys/devices/.../power/wakeup_active Date: September 2010 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../wakeup_active attribute contains either 1, or 0, depending on whether or not a wakeup event associated with the device is being processed (1). This attribute is read-only. - If the device is not enabled to wake up the system from sleep - states, this attribute is not present. + If the device is not capable to wake up the system from sleep + states, this attribute is not present. If the device is not + enabled to wake up the system from sleep states, this attribute + is empty. What: /sys/devices/.../power/wakeup_total_time_ms Date: September 2010 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../wakeup_total_time_ms attribute contains the total time of processing wakeup events associated with the device, in milliseconds. This attribute is read-only. If the - device is not enabled to wake up the system from sleep states, - this attribute is not present. + device is not capable to wake up the system from sleep states, + this attribute is not present. If the device is not enabled to + wake up the system from sleep states, this attribute is empty. What: /sys/devices/.../power/wakeup_max_time_ms Date: September 2010 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../wakeup_max_time_ms attribute contains the maximum time of processing a single wakeup event associated with the device, in milliseconds. This attribute is read-only. - If the device is not enabled to wake up the system from sleep - states, this attribute is not present. + If the device is not capable to wake up the system from sleep + states, this attribute is not present. If the device is not + enabled to wake up the system from sleep states, this attribute + is empty. What: /sys/devices/.../power/wakeup_last_time_ms Date: September 2010 -Contact: Rafael J. Wysocki <rjw@sisk.pl> +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> Description: The /sys/devices/.../wakeup_last_time_ms attribute contains the value of the monotonic clock corresponding to the time of signaling the last wakeup event associated with the device, in milliseconds. This attribute is read-only. If the device is not enabled to wake up the system from sleep states, this - attribute is not present. + attribute is not present. If the device is not enabled to wake + up the system from sleep states, this attribute is empty. + +What: /sys/devices/.../power/wakeup_prevent_sleep_time_ms +Date: February 2012 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> +Description: + The /sys/devices/.../wakeup_prevent_sleep_time_ms attribute + contains the total time the device has been preventing + opportunistic transitions to sleep states from occurring. + This attribute is read-only. If the device is not capable to + wake up the system from sleep states, this attribute is not + present. If the device is not enabled to wake up the system + from sleep states, this attribute is empty. What: /sys/devices/.../power/autosuspend_delay_ms Date: September 2010 @@ -165,3 +200,77 @@ Description: Not all drivers support this attribute. If it isn't supported, attempts to read or write it will yield I/O errors. + +What: /sys/devices/.../power/pm_qos_resume_latency_us +Date: March 2012 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> +Description: + The /sys/devices/.../power/pm_qos_resume_latency_us attribute + contains the PM QoS resume latency limit for the given device, + which is the maximum allowed time it can take to resume the + device, after it has been suspended at run time, from a resume + request to the moment the device will be ready to process I/O, + in microseconds. If it is equal to 0, however, this means that + the PM QoS resume latency may be arbitrary. + + Not all drivers support this attribute. If it isn't supported, + it is not present. + + This attribute has no effect on system-wide suspend/resume and + hibernation. + +What: /sys/devices/.../power/pm_qos_latency_tolerance_us +Date: January 2014 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> +Description: + The /sys/devices/.../power/pm_qos_latency_tolerance_us attribute + contains the PM QoS active state latency tolerance limit for the + given device in microseconds. That is the maximum memory access + latency the device can suffer without any visible adverse + effects on user space functionality. If that value is the + string "any", the latency does not matter to user space at all, + but hardware should not be allowed to set the latency tolerance + for the device automatically. + + Reading "auto" from this file means that the maximum memory + access latency for the device may be determined automatically + by the hardware as needed. Writing "auto" to it allows the + hardware to be switched to this mode if there are no other + latency tolerance requirements from the kernel side. + + This attribute is only present if the feature controlled by it + is supported by the hardware. + + This attribute has no effect on runtime suspend and resume of + devices and on system-wide suspend/resume and hibernation. + +What: /sys/devices/.../power/pm_qos_no_power_off +Date: September 2012 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> +Description: + The /sys/devices/.../power/pm_qos_no_power_off attribute + is used for manipulating the PM QoS "no power off" flag. If + set, this flag indicates to the kernel that power should not + be removed entirely from the device. + + Not all drivers support this attribute. If it isn't supported, + it is not present. + + This attribute has no effect on system-wide suspend/resume and + hibernation. + +What: /sys/devices/.../power/pm_qos_remote_wakeup +Date: September 2012 +Contact: Rafael J. Wysocki <rjw@rjwysocki.net> +Description: + The /sys/devices/.../power/pm_qos_remote_wakeup attribute + is used for manipulating the PM QoS "remote wakeup required" + flag. If set, this flag indicates to the kernel that the + device is a source of user events that have to be signaled from + its low-power states. + + Not all drivers support this attribute. If it isn't supported, + it is not present. + + This attribute has no effect on system-wide suspend/resume and + hibernation. |