Merge tag 'platform-drivers-x86-v5.4-1' of git://git.infradead.org/linux-platform-drivers-x86

Pull x86 platform-drivers updates from Andy Shevchenko:

 - ASUS WMI driver got a couple of updates, i.e. support of FAN is fixed
   for recent products and the charge threshold support has been added

 - Two uknown key events for Dell laptops are being ignored now to avoid
   spamming users with harmless messages

 - HP ZBook 17 G5 and ASUS Zenbook UX430UNR got accelerometer support.

 - Intel CherryTrail platforms had a regression with wake up. Now it's
   fixed

 - Intel PMC driver got fixed in order to work nicely in Xen
   environment

 - Intel Speed Select driver provides bucket vs core count relationship.
   Besides that the tools has been updated for better output

 - The PrivacyGuard is enabled on Lenovo ThinkPad laptops

 - Three tablets - Trekstor Primebook C11B 2-in-1, Irbis TW90 and Chuwi
   Surbook Mini - got touchscreen support

* tag 'platform-drivers-x86-v5.4-1' of git://git.infradead.org/linux-platform-drivers-x86: (53 commits)
  MAINTAINERS: Switch PDx86 subsystem status to Odd Fixes
  platform/x86: asus-wmi: Refactor charge threshold to use the battery hooking API
  platform/x86: asus-wmi: Rename CHARGE_THRESHOLD to RSOC
  platform/x86: asus-wmi: Reorder ASUS_WMI_CHARGE_THRESHOLD
  tools/power/x86/intel-speed-select: Display core count for bucket
  platform/x86: ISST: Allow additional TRL MSRs
  tools/power/x86/intel-speed-select: Fix memory leak
  tools/power/x86/intel-speed-select: Output success/failed for command output
  tools/power/x86/intel-speed-select: Output human readable CPU list
  tools/power/x86/intel-speed-select: Change turbo ratio output to maximum turbo frequency
  tools/power/x86/intel-speed-select: Switch output to MHz
  tools/power/x86/intel-speed-select: Simplify output for turbo-freq and base-freq
  tools/power/x86/intel-speed-select: Fix cpu-count output
  tools/power/x86/intel-speed-select: Fix help option typo
  tools/power/x86/intel-speed-select: Fix package typo
  tools/power/x86/intel-speed-select: Fix a read overflow in isst_set_tdp_level_msr()
  platform/x86: intel_int0002_vgpio: Use device_init_wakeup
  platform/x86: intel_int0002_vgpio: Fix wakeups not working on Cherry Trail
  platform/x86: compal-laptop: Initialize "value" in ec_read_u8()
  platform/x86: touchscreen_dmi: Add info for the Trekstor Primebook C11B 2-in-1
  ...

1 files changed, 23 insertions, 0 deletions

diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
index adea0bf2acc5..822907dcc845 100644
--- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst
+++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
@@ -49,6 +49,7 @@ detailed description):
 	- Fan control and monitoring: fan speed, fan enable/disable
 	- WAN enable and disable
 	- UWB enable and disable
+	- LCD Shadow (PrivacyGuard) enable and disable
 
 A compatibility table by model and feature is maintained on the web
 site, http://ibm-acpi.sf.net/. I appreciate any success or failure
@@ -1409,6 +1410,28 @@ Sysfs notes
 	Documentation/driver-api/rfkill.rst for details.
 
 
+LCD Shadow control
+------------------
+
+procfs: /proc/acpi/ibm/lcdshadow
+
+Some newer T480s and T490s ThinkPads provide a feature called
+PrivacyGuard. By turning this feature on, the usable vertical and
+horizontal viewing angles of the LCD can be limited (as if some privacy
+screen was applied manually in front of the display).
+
+procfs notes
+^^^^^^^^^^^^
+
+The available commands are::
+
+	echo '0' >/proc/acpi/ibm/lcdshadow
+	echo '1' >/proc/acpi/ibm/lcdshadow
+
+The first command ensures the best viewing angle and the latter one turns
+on the feature, restricting the viewing angles.
+
+
 EXPERIMENTAL: UWB
 -----------------