author: Nitin Joshi <nitjoshi@gmail.com> 2021-03-17 11:46:36 +0900
committer: Hans de Goede <hdegoede@redhat.com> 2021-03-21 18:04:19 +0100
commit: 3feb52a2b8d97989823f1aa9cfff281b8475ff4e
parent: 2728f39dfc720983e2b69f0f1f0c403aaa7c346f
Commit Summary:
Diffstat:
1 file changed, 14 insertions, 2 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
-----------------