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From 13b35027202496be168b3c345cd6fc65055f9604 Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Wed, 24 Oct 2018 10:35:17 +1000
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Subject: [PATCH 4/4] Remember the event types we receive and skip events with
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no data
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On RHEL7.x kernels we get event frames with merely MSC_SERIAL -1 for some
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devices on proximity in. This is caused by the accelerometer data that is
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otherwise suppressed by those kernels.
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E: 123.456 0000 0000 0000 # ------------ SYN_REPORT (0) ----------
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E: 123.456 0004 0000 -001 # EV_MSC / MSC_SERIAL -1
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For a MSC_SERIAL -1 we default to the PAD_ID (0x10), despite the events
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happening on the Pen device node. This triggers an error message during EV_SYN
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processing:
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(EE) usbDispatchEvents: Device Type mismatch - 16 -> 0. This is a BUG.
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Once we receive the BTN_TOOL_PEN when the actual pen comes into proximity, the
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error message goes away because our tool type matches with what we expect.
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Fix this issue by remembering which event types we received in the current
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frame. If all we got was EV_MSC, skip the event dispatch - we don't have any
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data to process anyway.
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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
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(cherry picked from commit 84400df38f0f9abe664de26a8d3747b10f3a05e5)
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---
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src/wcmUSB.c | 24 ++++++++++++++++++------
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1 file changed, 18 insertions(+), 6 deletions(-)
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diff --git a/src/wcmUSB.c b/src/wcmUSB.c
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index cf89ff8..2bb6b78 100644
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--- a/src/wcmUSB.c
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+++ b/src/wcmUSB.c
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@@ -38,6 +38,7 @@ typedef struct {
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int wcmMTChannel;
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int wcmEventCnt;
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struct input_event wcmEvents[MAX_USB_EVENTS];
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+ uint32_t wcmEventFlags; /* event types received in this frame */
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int nbuttons; /* total number of buttons */
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int npadkeys; /* number of pad keys in the above array */
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int padkey_code[WCM_MAX_BUTTONS];/* hardware codes for buttons */
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@@ -973,6 +974,13 @@ static int usbChooseChannel(WacomCommonPtr common, int device_type, unsigned int
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return channel;
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}
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+static inline void
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+usbResetEventCounter(wcmUSBData *private)
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+{
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+ private->wcmEventCnt = 0;
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+ private->wcmEventFlags = 0;
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+}
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+
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static void usbParseEvent(InputInfoPtr pInfo,
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const struct input_event* event)
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{
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@@ -989,12 +997,13 @@ static void usbParseEvent(InputInfoPtr pInfo,
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{
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LogMessageVerbSigSafe(X_ERROR, 0, "%s: usbParse: Exceeded event queue (%d) \n",
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pInfo->name, private->wcmEventCnt);
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- private->wcmEventCnt = 0;
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+ usbResetEventCounter(private);
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return;
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}
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/* save it for later */
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private->wcmEvents[private->wcmEventCnt++] = *event;
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+ private->wcmEventFlags |= 1 << event->type;
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switch (event->type)
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{
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@@ -1032,7 +1041,7 @@ static void usbParseMscEvent(InputInfoPtr pInfo,
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LogMessageVerbSigSafe(X_ERROR, 0,
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"%s: usbParse: Ignoring event from invalid serial 0\n",
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pInfo->name);
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- private->wcmEventCnt = 0;
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+ usbResetEventCounter(private);
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}
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}
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@@ -1048,6 +1057,7 @@ static void usbParseSynEvent(InputInfoPtr pInfo,
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WacomDevicePtr priv = (WacomDevicePtr)pInfo->private;
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WacomCommonPtr common = priv->common;
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wcmUSBData* private = common->private;
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+ const uint32_t significant_event_types = ~(1 << EV_SYN | 1 << EV_MSC);
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if (event->code != SYN_REPORT)
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return;
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@@ -1060,9 +1070,11 @@ static void usbParseSynEvent(InputInfoPtr pInfo,
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goto skipEvent;
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}
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- /* ignore sync windows that contain no data */
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- if (private->wcmEventCnt == 1 &&
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- private->wcmEvents->type == EV_SYN) {
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+
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+ /* If all we get in an event frame is EV_SYN/EV_MSC, we don't have
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+ * real data to process. */
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+ if ((private->wcmEventFlags & significant_event_types) == 0)
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+ {
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DBG(6, common, "no real events received\n");
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goto skipEvent;
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}
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@@ -1071,7 +1083,7 @@ static void usbParseSynEvent(InputInfoPtr pInfo,
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usbDispatchEvents(pInfo);
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skipEvent:
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- private->wcmEventCnt = 0;
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+ usbResetEventCounter(private);
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}
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static int usbFilterEvent(WacomCommonPtr common, struct input_event *event)
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--
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2.19.2
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