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Fix left-button not working with some hid-multitouch touchpads

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Hans de Goede 2017-11-26 14:42:26 +01:00
parent 5d8f3c9211
commit f10b01dcd4
4 changed files with 278 additions and 0 deletions
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106
0001-HID-multitouch-Properly-deal-with-Win8-PTP-reports-w.patch Normal file
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@ -0,0 +1,106 @@
From f5c1da991de077420fda17a236342de5a0068f5d Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 22 Nov 2017 12:57:08 +0100
Subject: [PATCH v2 1/3] HID: multitouch: Properly deal with Win8 PTP reports
with 0 touches
The Windows Precision Touchpad spec "Figure 4 Button Only Down and Up"
and "Table 9 Report Sequence for Button Only Down and Up" indicate
that the first packet of a (possibly hybrid mode multi-packet) frame
may contain a contact-count of 0 if only a button is pressed and no
fingers are detected.
This means that a value of 0 for contact-count is a valid value and
should be used as expected contact count when it is the first packet
(num_received == 0), as extra check to make sure that this is the first
packet of a buttons only frame, we also check that the timestamp is
different.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
drivers/hid/hid-multitouch.c | 32 ++++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 9ef24b518f12..d8b1cad74faf 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -119,6 +119,9 @@ struct mt_device {
unsigned long mt_io_flags; /* mt flags (MT_IO_FLAGS_*) */
int cc_index; /* contact count field index in the report */
int cc_value_index; /* contact count value index in the field */
+ int scantime_index; /* scantime field index in the report */
+ int scantime_val_index; /* scantime value index in the field */
+ int prev_scantime; /* scantime reported in the previous packet */
unsigned last_slot_field; /* the last field of a slot */
unsigned mt_report_id; /* the report ID of the multitouch device */
unsigned long initial_quirks; /* initial quirks state */
@@ -599,6 +602,12 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
EV_MSC, MSC_TIMESTAMP);
input_set_capability(hi->input, EV_MSC, MSC_TIMESTAMP);
mt_store_field(usage, td, hi);
+ /* Ignore if indexes are out of bounds. */
+ if (field->index >= field->report->maxfield ||
+ usage->usage_index >= field->report_count)
+ return 1;
+ td->scantime_index = field->index;
+ td->scantime_val_index = usage->usage_index;
return 1;
case HID_DG_CONTACTCOUNT:
/* Ignore if indexes are out of bounds. */
@@ -855,9 +864,10 @@ static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
{
struct mt_device *td = hid_get_drvdata(hid);
+ __s32 cls = td->mtclass.name;
struct hid_field *field;
unsigned count;
- int r, n;
+ int r, n, scantime = 0;
/* sticky fingers release in progress, abort */
if (test_and_set_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
@@ -867,12 +877,29 @@ static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
* Includes multi-packet support where subsequent
* packets are sent with zero contactcount.
*/
+ if (td->scantime_index >= 0) {
+ field = report->field[td->scantime_index];
+ scantime = field->value[td->scantime_val_index];
+ }
if (td->cc_index >= 0) {
struct hid_field *field = report->field[td->cc_index];
int value = field->value[td->cc_value_index];
- if (value)
+
+ /*
+ * For Win8 PTPs the first packet (td->num_received == 0) may
+ * have a contactcount of 0 if there only is a button event.
+ * We double check that this is not a continuation packet
+ * of a possible multi-packet frame be checking that the
+ * timestamp has changed.
+ */
+ if ((cls == MT_CLS_WIN_8 || cls == MT_CLS_WIN_8_DUAL) &&
+ td->num_received == 0 && td->prev_scantime != scantime)
+ td->num_expected = value;
+ /* A non 0 contact count always indicates a first packet */
+ else if (value)
td->num_expected = value;
}
+ td->prev_scantime = scantime;
for (r = 0; r < report->maxfield; r++) {
field = report->field[r];
@@ -1329,6 +1356,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
td->maxcontact_report_id = -1;
td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
td->cc_index = -1;
+ td->scantime_index = -1;
td->mt_report_id = -1;
hid_set_drvdata(hdev, td);
--
2.14.3

84
0002-HID-multitouch-Only-look-at-non-touch-fields-in-firs.patch Normal file
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@ -0,0 +1,84 @@
From c25d877f4ee97deb92170129eee4777a5d5997d9 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 22 Nov 2017 12:57:09 +0100
Subject: [PATCH v2 2/3] HID: multitouch: Only look at non touch fields in
first packet of a frame
Devices in "single finger hybrid mode" will send one report per finger,
on some devices only the first report of such a multi-packet frame will
contain a value for BTN_LEFT, in subsequent reports (if multiple fingers
are down) the value is always 0, causing hid-mt to report BTN_LEFT going
1 - 0 - 1 - 0 when pressing a clickpad and putting down a second finger.
This happens for example on USB 0603:0002 mt touchpads.
This commit fixes this by only reporting non touch fields for the first
packet of a (possibly) multi-packet frame.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
drivers/hid/hid-multitouch.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index d8b1cad74faf..760c4a042e6a 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -787,9 +787,11 @@ static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
}
static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
- struct hid_usage *usage, __s32 value)
+ struct hid_usage *usage, __s32 value,
+ bool first_packet)
{
struct mt_device *td = hid_get_drvdata(hid);
+ __s32 cls = td->mtclass.name;
__s32 quirks = td->mtclass.quirks;
struct input_dev *input = field->hidinput->input;
@@ -846,6 +848,15 @@ static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
break;
default:
+ /*
+ * For Win8 PTP touchpads we should only look at
+ * non finger/touch events in the first_packet of
+ * a (possible) multi-packet frame.
+ */
+ if ((cls == MT_CLS_WIN_8 || cls == MT_CLS_WIN_8_DUAL) &&
+ !first_packet)
+ return;
+
if (usage->type)
input_event(input, usage->type, usage->code,
value);
@@ -866,6 +877,7 @@ static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
struct mt_device *td = hid_get_drvdata(hid);
__s32 cls = td->mtclass.name;
struct hid_field *field;
+ bool first_packet;
unsigned count;
int r, n, scantime = 0;
@@ -901,6 +913,7 @@ static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
}
td->prev_scantime = scantime;
+ first_packet = td->num_received == 0;
for (r = 0; r < report->maxfield; r++) {
field = report->field[r];
count = field->report_count;
@@ -910,7 +923,7 @@ static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
for (n = 0; n < count; n++)
mt_process_mt_event(hid, field, &field->usage[n],
- field->value[n]);
+ field->value[n], first_packet);
}
if (td->num_received >= td->num_expected)
--
2.14.3

78
0003-HID-multitouch-Combine-all-left-button-events-in-a-f.patch Normal file
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@ -0,0 +1,78 @@
From 1719566899e5a69b4ba767beb07dab7ceb9ae5a8 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 22 Nov 2017 12:57:10 +0100
Subject: [PATCH v2 3/3] HID: multitouch: Combine all left-button events in a
frame
According to the Win8 Precision Touchpad spec, inside the HID_UP_BUTTON
usage-page usage 1 is for a clickpad getting clicked, 2 for an external
left button and 3 for an external right button. Since Linux uses
BTN_LEFT for a clickpad being clicked we end up mapping both usage 1
and 2 to BTN_LEFT and if a single report contains both then we ended
up always reporting the value of both in a single SYN, e.g. :
BTN_LEFT 1, BTN_LEFT 0, SYN. This happens for example with Hantick
HTT5288 i2c mt touchpads.
This commit fixes this by not immediately reporting left button when we
parse the report, but instead storing or-ing together the values and
reporting the result from mt_sync_frame() when we've a complete frame.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
drivers/hid/hid-multitouch.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 760c4a042e6a..76088f2cf598 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -122,6 +122,7 @@ struct mt_device {
int scantime_index; /* scantime field index in the report */
int scantime_val_index; /* scantime value index in the field */
int prev_scantime; /* scantime reported in the previous packet */
+ int left_button_state; /* left button state */
unsigned last_slot_field; /* the last field of a slot */
unsigned mt_report_id; /* the report ID of the multitouch device */
unsigned long initial_quirks; /* initial quirks state */
@@ -743,10 +744,16 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
*/
static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
{
+ __s32 cls = td->mtclass.name;
+
+ if (cls == MT_CLS_WIN_8 || cls == MT_CLS_WIN_8_DUAL)
+ input_event(input, EV_KEY, BTN_LEFT, td->left_button_state);
+
input_mt_sync_frame(input);
input_event(input, EV_MSC, MSC_TIMESTAMP, td->timestamp);
input_sync(input);
td->num_received = 0;
+ td->left_button_state = 0;
if (test_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags))
set_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
else
@@ -857,6 +864,19 @@ static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
!first_packet)
return;
+ /*
+ * For Win8 PTP touchpads we map both the clickpad click
+ * and any "external" left buttons to BTN_LEFT if a
+ * device claims to have both we need to report 1 for
+ * BTN_LEFT if either is pressed, so we or all values
+ * together and report the result in mt_sync_frame().
+ */
+ if ((cls == MT_CLS_WIN_8 || cls == MT_CLS_WIN_8_DUAL) &&
+ usage->type == EV_KEY && usage->code == BTN_LEFT) {
+ td->left_button_state |= value;
+ return;
+ }
+
if (usage->type)
input_event(input, usage->type, usage->code,
value);
--
2.14.3

10
kernel.spec
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@ -641,6 +641,13 @@ Patch628: 0001-Bluetooth-btusb-Add-a-Kconfig-option-to-enable-USB-a.patch
# rhbz 1516584
Patch629: drm-ttm-don-t-attempt-to-use-hugepages-if-dma32-requested.mbox
# Fix left-button not working with some hid-multitouch touchpads
# Adding these suggested by Benjamin Tissoires
# Queued in hid.git/for-4.16/hid-quirks-cleanup/multitouch for merging into 4.16
Patch630: 0001-HID-multitouch-Properly-deal-with-Win8-PTP-reports-w.patch
Patch631: 0002-HID-multitouch-Only-look-at-non-touch-fields-in-firs.patch
Patch632: 0003-HID-multitouch-Combine-all-left-button-events-in-a-f.patch
# END OF PATCH DEFINITIONS
%endif
@ -2190,6 +2197,9 @@ fi
#
#
%changelog
* Sun Nov 26 2017 Hans de Goede <jwrdegoede@fedoraproject.org>
- Fix left-button not working with some hid-multitouch touchpads
* Thu Nov 23 2017 Laura Abbott <labbott@redhat.com> - 4.15.0-0.rc0.git7.2
- Fix for TTM regression (rhbz 1516584)