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Subject[PATCH v3 17/20] HID: Add an input configured notification callback
Date
With the input_configured() callback in place, the setup and frame
synchronization can be simplified. The input device initialization is
moved to mt_input_configured(), to make sure the full HID report has been
seen.

Cc: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
drivers/hid/hid-multitouch.c | 67 +++++++++++++++++++++++++-------------------
1 file changed, 38 insertions(+), 29 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index c400d90..1df86a7 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -92,8 +92,10 @@ struct mt_device {
__u8 touches_by_report; /* how many touches are present in one report:
* 1 means we should use a serial protocol
* > 1 means hybrid (multitouch) protocol */
+ bool serial_maybe; /* need to check for serial protocol */
bool curvalid; /* is the current contact valid? */
struct mt_slot *slots;
+ unsigned mt_flags; /* flags to pass to input-mt */
};

/* classes of device behavior */
@@ -319,24 +321,16 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
* We need to ignore fields that belong to other collections
* such as Mouse that might have the same GenericDesktop usages. */
if (field->application == HID_DG_TOUCHSCREEN)
- set_bit(INPUT_PROP_DIRECT, hi->input->propbit);
+ td->mt_flags |= INPUT_MT_DIRECT;
else if (field->application != HID_DG_TOUCHPAD)
return 0;

- /* In case of an indirect device (touchpad), we need to add
- * specific BTN_TOOL_* to be handled by the synaptics xorg
- * driver.
- * We also consider that touchscreens providing buttons are touchpads.
+ /*
+ * Model touchscreens providing buttons as touchpads.
*/
if (field->application == HID_DG_TOUCHPAD ||
- (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON ||
- cls->is_indirect) {
- set_bit(INPUT_PROP_POINTER, hi->input->propbit);
- set_bit(BTN_TOOL_FINGER, hi->input->keybit);
- set_bit(BTN_TOOL_DOUBLETAP, hi->input->keybit);
- set_bit(BTN_TOOL_TRIPLETAP, hi->input->keybit);
- set_bit(BTN_TOOL_QUADTAP, hi->input->keybit);
- }
+ (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
+ td->mt_flags |= INPUT_MT_POINTER;

/* eGalax devices provide a Digitizer.Stylus input which overrides
* the correct Digitizers.Finger X/Y ranges.
@@ -353,8 +347,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
EV_ABS, ABS_MT_POSITION_X);
set_abs(hi->input, ABS_MT_POSITION_X, field,
cls->sn_move);
- /* touchscreen emulation */
- set_abs(hi->input, ABS_X, field, cls->sn_move);
mt_store_field(usage, td, hi);
td->last_field_index = field->index;
return 1;
@@ -363,8 +355,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
EV_ABS, ABS_MT_POSITION_Y);
set_abs(hi->input, ABS_MT_POSITION_Y, field,
cls->sn_move);
- /* touchscreen emulation */
- set_abs(hi->input, ABS_Y, field, cls->sn_move);
mt_store_field(usage, td, hi);
td->last_field_index = field->index;
return 1;
@@ -388,9 +378,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
td->last_field_index = field->index;
return 1;
case HID_DG_CONTACTID:
- if (!td->maxcontacts)
- td->maxcontacts = MT_DEFAULT_MAXCONTACT;
- input_mt_init_slots(hi->input, td->maxcontacts, 0);
mt_store_field(usage, td, hi);
td->last_field_index = field->index;
td->touches_by_report++;
@@ -418,9 +405,6 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
EV_ABS, ABS_MT_PRESSURE);
set_abs(hi->input, ABS_MT_PRESSURE, field,
cls->sn_pressure);
- /* touchscreen emulation */
- set_abs(hi->input, ABS_PRESSURE, field,
- cls->sn_pressure);
mt_store_field(usage, td, hi);
td->last_field_index = field->index;
return 1;
@@ -536,7 +520,7 @@ static void mt_emit_event(struct mt_device *td, struct input_dev *input)

}

- input_mt_report_pointer_emulation(input, true);
+ input_mt_sync_frame(input);
input_sync(input);
td->num_received = 0;
}
@@ -685,6 +669,32 @@ static void mt_post_parse(struct mt_device *td)
}
}

+static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
+
+{
+ struct mt_device *td = hid_get_drvdata(hdev);
+ struct mt_class *cls = &td->mtclass;
+ struct input_dev *input = hi->input;
+
+ /* Only initialize slots for MT input devices */
+ if (!test_bit(ABS_MT_POSITION_X, input->absbit))
+ return;
+
+ if (!td->maxcontacts)
+ td->maxcontacts = MT_DEFAULT_MAXCONTACT;
+
+ mt_post_parse(td);
+ if (td->serial_maybe)
+ mt_post_parse_default_settings(td);
+
+ if (cls->is_indirect)
+ td->mt_flags |= INPUT_MT_POINTER;
+
+ input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
+
+ td->mt_flags = 0;
+}
+
static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret, i;
@@ -722,6 +732,9 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
goto fail;
}

+ if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
+ td->serial_maybe = true;
+
ret = hid_parse(hdev);
if (ret != 0)
goto fail;
@@ -730,11 +743,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (ret)
goto fail;

- mt_post_parse(td);
-
- if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
- mt_post_parse_default_settings(td);
-
td->slots = kzalloc(td->maxcontacts * sizeof(struct mt_slot),
GFP_KERNEL);
if (!td->slots) {
@@ -1087,6 +1095,7 @@ static struct hid_driver mt_driver = {
.remove = mt_remove,
.input_mapping = mt_input_mapping,
.input_mapped = mt_input_mapped,
+ .input_configured = mt_input_configured,
.feature_mapping = mt_feature_mapping,
.usage_table = mt_grabbed_usages,
.event = mt_event,
--
1.7.12


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