Hi All,
We have received multiple bug reports that Plantronics headsets are causing or interfering with mouse events. We've identified the root cause of this in hid-input.c, where un-handled usages (from any usage page) will be mapped to miscellaneous LEDs, buttons, or movements. In short, press a USB equipped volume, mute, or hang-up button and get a random mouse event.
This intermittent behavior isn't consistent across all headsets since with similar capabilities as usages marked 'constant' are ignored early on in 'hidinput_configure_usage'. While interpretation of the correct use of 'constant usages' is left to the individual vendors, we still feel that the HID input driver should not be mapping otherwise unhandled usages to LED_/BIN_/REL_/ABS_MISC usages events.
Solving this issue is a larger effort and it's hard for us to comment on the needs of other manufacturers. That said, we would like to propose the attached interim fix which assumes mouse events don't come from the Telephony page.
jd
------------------ snip --------------------
>From 647545b985b75434609c58dda2ef6612e231a44e Mon Sep 17 00:00:00 2001
From: JD Cole <jd.cole@xxxxxxxxxxxxxxx>
Date: Fri, 10 Oct 2014 17:41:27 -0400
Subject: [PATCH] Prevent HID Telephony page events from being mapped to
miscellaneous buttons.
The hid-input previously interpreted un-mapped telephony page usages, incorrectly,
to misc mouse, button, or LED messages. Exhibited most commonly as an USB telephony
headsets causing intermittent or "random" mouse behavior.
Signed-off-by: JD Cole <jd.cole@xxxxxxxxxxxxxxx>
---
drivers/hid/hid-input.c | 3 +++
include/linux/hid.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 012880a..1e9ef8e 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -895,6 +895,9 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
}
break;
+ case HID_UP_TELEPHONY:
+ goto ignore;
+
default:
unknown:
if (field->report_size == 1) {
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 4f8aa47..6489a93 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -159,6 +159,7 @@ struct hid_item {
#define HID_UP_LED 0x00080000
#define HID_UP_BUTTON 0x00090000
#define HID_UP_ORDINAL 0x000a0000
+#define HID_UP_TELEPHONY 0x000b0000
#define HID_UP_CONSUMER 0x000c0000
#define HID_UP_DIGITIZER 0x000d0000
#define HID_UP_PID 0x000f0000
--
1.8.3.1
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