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Subject[PATCH 4.14 080/183] platform/x86: thinkpad_acpi: suppress warning about palm detection
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Herrmann <dh.herrmann@gmail.com>


[ Upstream commit 587d8628fb71c3bfae29fb2bbe84c1478c59bac8 ]

This patch prevents the thinkpad_acpi driver from warning about 2 event
codes returned for keyboard palm-detection. No behavioral changes,
other than suppressing the warning in the kernel log. The events are
still forwarded via acpi-netlink channels.

We could, optionally, decide to forward the event through a
input-switch on the tpacpi input device. However, so far no suitable
input-code exists, and no similar drivers report such events. Hence,
leave it an acpi event for now.

Note that the event-codes are named based on empirical studies. On the
ThinkPad X1 5th Gen the sensor can be found underneath the arrow key.

Cc: Matthew Thode <mthode@mthode.org>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/platform/x86/thinkpad_acpi.c | 10 ++++++++++
1 file changed, 10 insertions(+)

--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -214,6 +214,10 @@ enum tpacpi_hkey_event_t {
/* AC-related events */
TP_HKEY_EV_AC_CHANGED = 0x6040, /* AC status changed */

+ /* Further user-interface events */
+ TP_HKEY_EV_PALM_DETECTED = 0x60b0, /* palm hoveres keyboard */
+ TP_HKEY_EV_PALM_UNDETECTED = 0x60b1, /* palm removed */
+
/* Misc */
TP_HKEY_EV_RFKILL_CHANGED = 0x7000, /* rfkill switch changed */
};
@@ -3973,6 +3977,12 @@ static bool hotkey_notify_6xxx(const u32
*send_acpi_ev = false;
break;

+ case TP_HKEY_EV_PALM_DETECTED:
+ case TP_HKEY_EV_PALM_UNDETECTED:
+ /* palm detected hovering the keyboard, forward to user-space
+ * via netlink for consumption */
+ return true;
+
default:
pr_warn("unknown possible thermal alarm or keyboard event received\n");
known = false;

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