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HID: multitouch: implement precision touchpad latency and switches

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The Win 8.1 precision touchpad spec introduce new modes for touchpads
that can come in handy[1].

Implement the settings of these modes, so we are not taken off-guard if
a firmware decides to enforce them.

[1] https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/windows-precision-touchpad-required-hid-top-level-collections

Signed-off-by: Benjamin Tissoires <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Benjamin Tissoires 2018-04-24 10:04:37 +02:00 • committed by Jiri Kosina
commit 02946f4b43
2 changed files with 32 additions and 5 deletions
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34
drivers/hid/hid-multitouch.c
View file

@ -81,6 +81,11 @@ MODULE_LICENSE("GPL");
#define MT_BUTTONTYPE_CLICKPAD 0
enum latency_mode {
HID_LATENCY_NORMAL = 0,
HID_LATENCY_HIGH = 1,
};
#define MT_IO_FLAGS_RUNNING 0
#define MT_IO_FLAGS_ACTIVE_SLOTS 1
#define MT_IO_FLAGS_PENDING_SLOTS 2
@ -1156,7 +1161,10 @@ static void mt_report(struct hid_device *hid, struct hid_report *report)
static bool mt_need_to_apply_feature(struct hid_device *hdev,
struct hid_field *field,
struct hid_usage *usage)
struct hid_usage *usage,
enum latency_mode latency,
bool surface_switch,
bool button_switch)
{
struct mt_device *td = hid_get_drvdata(hdev);
struct mt_class *cls = &td->mtclass;
@ -1195,12 +1203,25 @@ static bool mt_need_to_apply_feature(struct hid_device *hdev,
}
}
break;
case HID_DG_LATENCYMODE:
field->value[index] = latency;
return 1;
case HID_DG_SURFACESWITCH:
field->value[index] = surface_switch;
return 1;
case HID_DG_BUTTONSWITCH:
field->value[index] = button_switch;
return 1;
}
return false; /* no need to update the report */
}
static void mt_set_modes(struct hid_device *hdev)
static void mt_set_modes(struct hid_device *hdev, enum latency_mode latency,
bool surface_switch, bool button_switch)
{
struct hid_report_enum *rep_enum;
struct hid_report *rep;
@ -1222,7 +1243,10 @@ static void mt_set_modes(struct hid_device *hdev)
if (mt_need_to_apply_feature(hdev,
rep->field[i],
usage))
usage,
latency,
surface_switch,
button_switch))
update_report = true;
}
}
@ -1467,7 +1491,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
dev_warn(&hdev->dev, "Cannot allocate sysfs group for %s\n",
hdev->name);
mt_set_modes(hdev);
mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
/* release .fields memory as it is not used anymore */
devm_kfree(&hdev->dev, td->fields);
@ -1480,7 +1504,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
static int mt_reset_resume(struct hid_device *hdev)
{
mt_release_contacts(hdev);
mt_set_modes(hdev);
mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
return 0;
}