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| author |   Mark Pearson <markpearson@lenovo.com> | 2020-07-02 21:23:53 -0400 |
|---|---|---|
| committer |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-07-15 12:45:06 +0300 |
| commit | acf7f4a59114471c3964f118564fe8e7a6f34bb8 (patch) | |
| tree | d5131a5d3d09113df52b83fbf7f97d73a5509966 /Documentation/admin-guide/laptops/thinkpad-acpi.rst | |
| parent | platform/x86: thinkpad_acpi: Revert "Use strndup_user() in dispatch_proc_write()" (diff) | |
| download | linux-dev-acf7f4a59114471c3964f118564fe8e7a6f34bb8.tar.xz linux-dev-acf7f4a59114471c3964f118564fe8e7a6f34bb8.zip | |
platform/x86: thinkpad_acpi: lap or desk mode interface
Newer Lenovo Thinkpad platforms have support to identify whether the
system is on-lap or not using an ACPI DYTC event from the firmware.
This patch provides the ability to retrieve the current mode via sysfs
entrypoints and will be used by userspace for thermal mode and WWAN
functionality
Co-developed-by: Nitin Joshi <njoshi1@lenovo.com>
Signed-off-by: Nitin Joshi <njoshi1@lenovo.com>
Reviewed-by: Sugumaran <slacshiminar@lenovo.com>
Reviewed-by: Bastien Nocera <bnocera@redhat.com>
Signed-off-by: Mark Pearson <markpearson@lenovo.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'Documentation/admin-guide/laptops/thinkpad-acpi.rst')
| -rw-r--r-- | Documentation/admin-guide/laptops/thinkpad-acpi.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst index 822907dcc845..99066aa8d97b 100644 --- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst +++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst @@ -50,6 +50,7 @@ detailed description): - WAN enable and disable - UWB enable and disable - LCD Shadow (PrivacyGuard) enable and disable + - Lap mode sensor A compatibility table by model and feature is maintained on the web site, http://ibm-acpi.sf.net/. I appreciate any success or failure @@ -1432,6 +1433,20 @@ The first command ensures the best viewing angle and the latter one turns on the feature, restricting the viewing angles. +DYTC Lapmode sensor +------------------ + +sysfs: dytc_lapmode + +Newer thinkpads and mobile workstations have the ability to determine if +the device is in deskmode or lapmode. This feature is used by user space +to decide if WWAN transmission can be increased to maximum power and is +also useful for understanding the different thermal modes available as +they differ between desk and lap mode. + +The property is read-only. If the platform doesn't have support the sysfs +class is not created. + EXPERIMENTAL: UWB ----------------- |