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Drivers like thinkpad_acpi and ideapad_laptop call the platform_profile_notify() helper when the profile is changed by hardware (the embedded-controller/EC) in response to an EC handled hotkey. This allows userspace to monitor for such changes by polling for POLLPRI on the platform_profile sysfs file. But the profile can also be changed underneath a userspace program monitoring it by anonther userspace program storing a new value. Add a sysfs_notify() call to platform_profile_store(), so that userspace programs monitoring for changes also get notified in this case. Also update the documentation to document that POLLPRI polling can be used to watch for changes. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
36 lines
1.4 KiB
Plaintext
36 lines
1.4 KiB
Plaintext
What: /sys/firmware/acpi/platform_profile_choices
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Date: October 2020
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Contact: Hans de Goede <hdegoede@redhat.com>
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Description: This file contains a space-separated list of profiles supported for this device.
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Drivers must use the following standard profile-names:
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==================== ========================================
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low-power Low power consumption
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cool Cooler operation
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quiet Quieter operation
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balanced Balance between low power consumption
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and performance
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balanced-performance Balance between performance and low
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power consumption with a slight bias
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towards performance
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performance High performance operation
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==================== ========================================
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Userspace may expect drivers to offer more than one of these
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standard profile names.
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What: /sys/firmware/acpi/platform_profile
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Date: October 2020
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Contact: Hans de Goede <hdegoede@redhat.com>
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Description: Reading this file gives the current selected profile for this
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device. Writing this file with one of the strings from
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platform_profile_choices changes the profile to the new value.
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This file can be monitored for changes by polling for POLLPRI,
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POLLPRI will be signalled on any changes, independent of those
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changes coming from a userspace write; or coming from another
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source such as e.g. a hotkey triggered profile change handled
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either directly by the embedded-controller or fully handled
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inside the kernel.
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