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| author | Nitin Joshi <nitjoshi@gmail.com> | 2021-03-17 03:46:36 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2021-03-21 18:04:19 +0100 |
| commit | 3feb52a2b8d97989823f1aa9cfff281b8475ff4e (patch) | |
| tree | d3e99f5d31afc7c80ed79e316d8f1452cf218056 /Documentation/admin-guide/laptops | |
| parent | platform/x86: intel-vbtn: Stop reporting SW_DOCK events (diff) | |
| download | linux-3feb52a2b8d97989823f1aa9cfff281b8475ff4e.tar.xz linux-3feb52a2b8d97989823f1aa9cfff281b8475ff4e.zip | |
platform/x86: thinkpad_acpi: sysfs interface to get wwan antenna type
On some newer Thinkpads we need to set SAR value based on antenna type.
This patch provides a sysfs interface that userspace can use to get
antenna type and set corresponding SAR value, as is required for FCC
certification.
Reviewed-by: Mark Pearson <markpearson@lenovo.com>
Signed-off-by: Nitin Joshi <njoshi1@lenovo.com>
Link: https://lore.kernel.org/r/20210317024636.356175-1-njoshi1@lenovo.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'Documentation/admin-guide/laptops')
| -rw-r--r-- | Documentation/admin-guide/laptops/thinkpad-acpi.rst | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst index 91fd6846ce17..6721a80a2d4f 100644 --- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst +++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst @@ -52,6 +52,7 @@ detailed description): - LCD Shadow (PrivacyGuard) enable and disable - Lap mode sensor - Setting keyboard language + - WWAN Antenna type A compatibility table by model and feature is maintained on the web site, http://ibm-acpi.sf.net/. I appreciate any success or failure @@ -1490,6 +1491,25 @@ fr(French), fr-ch(French(Switzerland)), hu(Hungarian), it(Italy), jp (Japan), nl(Dutch), nn(Norway), pl(Polish), pt(portugese), sl(Slovenian), sv(Sweden), tr(Turkey) +WWAN Antenna type +----------------- + +sysfs: wwan_antenna_type + +On some newer Thinkpads we need to set SAR value based on the antenna +type. This interface will be used by userspace to get the antenna type +and set the corresponding SAR value, as is required for FCC certification. + +The available commands are:: + + cat /sys/devices/platform/thinkpad_acpi/wwan_antenna_type + +Currently 2 antenna types are supported as mentioned below: +- type a +- type b + +The property is read-only. If the platform doesn't have support the sysfs +class is not created. Adaptive keyboard ----------------- |