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Subject[PATCH 6/9] HID: multitouch: remove one copy of values
Date
The current way of handling multitouch data is not very straightforward:
- in mt_event() we do nothing
- in mt_report() we:
- do some gym to fetch the scantime and the contact count
- then iterate over the input fields where we copy the data to a
temporary place
- when we see the last field in a slot, we then use this data to emit
the input data

A more streamlined way is to first get all of the address in the report
of all fields, and then just pick the fields we are interested in in
mt_report()

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
drivers/hid/hid-multitouch.c | 546 +++++++++++++++++++++----------------------
1 file changed, 264 insertions(+), 282 deletions(-)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index ff763c0b936a..424fb5f66b7d 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -87,30 +87,34 @@ enum latency_mode {
#define MT_IO_FLAGS_ACTIVE_SLOTS 1
#define MT_IO_FLAGS_PENDING_SLOTS 2

-struct mt_slot {
- __s32 x, y, cx, cy, p, w, h, a;
- __s32 contactid; /* the device ContactID assigned to this slot */
- bool touch_state; /* is the touch valid? */
- bool inrange_state; /* is the finger in proximity of the sensor? */
- bool confidence_state; /* is the touch made by a finger? */
- bool has_azimuth; /* the contact reports azimuth */
+static const bool mtrue = true; /* default for true */
+static const bool mfalse; /* default for false */
+static const __s32 mzero; /* default for 0 */
+
+#define DEFAULT_TRUE ((void *)&mtrue)
+#define DEFAULT_FALSE ((void *)&mfalse)
+#define DEFAULT_ZERO ((void *)&mzero)
+
+struct mt_usages {
+ struct list_head list;
+ __s32 *x, *y, *cx, *cy, *p, *w, *h, *a;
+ __s32 *contactid; /* the device ContactID assigned to this slot */
+ bool *tip_state; /* is the touch valid? */
+ bool *inrange_state; /* is the finger in proximity of the sensor? */
+ bool *confidence_state; /* is the touch made by a finger? */
};

struct mt_application {
struct list_head list;
unsigned int application;
+ struct list_head mt_usages; /* mt usages list */

__s32 quirks;

- struct mt_slot curdata; /* placeholder of incoming data */
-
- 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 */
- unsigned int last_slot_field; /* the last field of a slot */
- bool curvalid; /* is the current contact valid? */
+ __s32 *scantime; /* scantime reported */
+ __s32 scantime_logical_max; /* max value for raw scantime */

+ __s32 *raw_cc; /* contact count in the report */
int left_button_state; /* left button state */
unsigned int mt_flags; /* flags to pass to input-mt */

@@ -142,11 +146,6 @@ struct mt_class {
bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
};

-struct mt_fields {
- unsigned usages[HID_MAX_FIELDS];
- unsigned int length;
-};
-
struct mt_report_data {
struct list_head list;
struct hid_report *report;
@@ -158,8 +157,6 @@ struct mt_device {
struct mt_class mtclass; /* our mt device class */
struct timer_list release_timer; /* to release sticky fingers */
struct hid_device *hdev; /* hid_device we're attached to */
- struct mt_fields *fields; /* temporary placeholder for storing the
- multitouch fields */
unsigned long mt_io_flags; /* mt flags (MT_IO_FLAGS_*) */
__u8 inputmode_value; /* InputMode HID feature value */
__u8 maxcontacts;
@@ -225,10 +222,11 @@ static void mt_post_parse(struct mt_device *td, struct mt_application *app);
* to a valid contact that was just read.
*/

-static int cypress_compute_slot(struct mt_application *app)
+static int cypress_compute_slot(struct mt_application *application,
+ struct mt_usages *slot)
{
- if (app->curdata.contactid != 0 || app->num_received == 0)
- return app->curdata.contactid;
+ if (*slot->contactid != 0 || application->num_received == 0)
+ return *slot->contactid;
else
return -1;
}
@@ -483,6 +481,34 @@ static void set_abs(struct input_dev *input, unsigned int code,
input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
}

+static struct mt_usages *mt_allocate_usage(struct hid_device *hdev,
+ struct mt_application *application)
+{
+ struct mt_usages *usage;
+
+ usage = devm_kzalloc(&hdev->dev, sizeof(*usage), GFP_KERNEL);
+ if (!usage)
+ return NULL;
+
+ /* set some defaults so we do not need to check for null pointers */
+ usage->x = DEFAULT_ZERO;
+ usage->y = DEFAULT_ZERO;
+ usage->cx = DEFAULT_ZERO;
+ usage->cy = DEFAULT_ZERO;
+ usage->p = DEFAULT_ZERO;
+ usage->w = DEFAULT_ZERO;
+ usage->h = DEFAULT_ZERO;
+ usage->a = DEFAULT_ZERO;
+ usage->contactid = DEFAULT_ZERO;
+ usage->tip_state = DEFAULT_FALSE;
+ usage->inrange_state = DEFAULT_FALSE;
+ usage->confidence_state = DEFAULT_TRUE;
+
+ list_add_tail(&usage->list, &application->mt_usages);
+
+ return usage;
+}
+
static struct mt_application *mt_allocate_application(struct mt_device *td,
unsigned int application)
{
@@ -494,6 +520,7 @@ static struct mt_application *mt_allocate_application(struct mt_device *td,
return NULL;

mt_application->application = application;
+ INIT_LIST_HEAD(&mt_application->mt_usages);

if (application == HID_DG_TOUCHSCREEN)
mt_application->mt_flags |= INPUT_MT_DIRECT;
@@ -506,8 +533,8 @@ static struct mt_application *mt_allocate_application(struct mt_device *td,
td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
}

- mt_application->cc_index = -1;
- mt_application->scantime_index = -1;
+ mt_application->scantime = DEFAULT_ZERO;
+ mt_application->raw_cc = DEFAULT_ZERO;
mt_application->quirks = td->mtclass.quirks;

list_add_tail(&mt_application->list, &td->applications);
@@ -587,17 +614,45 @@ static struct mt_report_data *mt_find_report_data(struct mt_device *td,
return rdata;
}

-static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
- struct hid_input *hi)
+static void mt_store_field(struct hid_device *hdev,
+ struct mt_application *application,
+ __s32 *value,
+ size_t offset)
{
- struct mt_fields *f = td->fields;
+ struct mt_usages *usage;
+ __s32 **target;
+
+ if (list_empty(&application->mt_usages))
+ usage = mt_allocate_usage(hdev, application);
+ else
+ usage = list_last_entry(&application->mt_usages,
+ struct mt_usages,
+ list);

- if (f->length >= HID_MAX_FIELDS)
+ if (!usage)
return;

- f->usages[f->length++] = usage->hid;
+ target = (__s32 **)((char *)usage + offset);
+
+ /* the value has already been filled, create a new slot */
+ if (*target != DEFAULT_TRUE &&
+ *target != DEFAULT_FALSE &&
+ *target != DEFAULT_ZERO) {
+ usage = mt_allocate_usage(hdev, application);
+ if (!usage)
+ return;
+
+ target = (__s32 **)((char *)usage + offset);
+ }
+
+ *target = value;
}

+#define MT_STORE_FIELD(__name) \
+ mt_store_field(hdev, app, \
+ &field->value[usage->usage_index], \
+ offsetof(struct mt_usages, __name))
+
static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max, struct mt_application *app)
@@ -627,24 +682,28 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
- if (prev_usage && (prev_usage->hid == usage->hid))
+ if (prev_usage && (prev_usage->hid == usage->hid)) {
code = ABS_MT_TOOL_X;
- else
+ MT_STORE_FIELD(cx);
+ } else {
code = ABS_MT_POSITION_X;
+ MT_STORE_FIELD(x);
+ }

- hid_map_usage(hi, usage, bit, max, EV_ABS, code);
set_abs(hi->input, code, field, cls->sn_move);
- mt_store_field(usage, td, hi);
+
return 1;
case HID_GD_Y:
- if (prev_usage && (prev_usage->hid == usage->hid))
+ if (prev_usage && (prev_usage->hid == usage->hid)) {
code = ABS_MT_TOOL_Y;
- else
+ MT_STORE_FIELD(cy);
+ } else {
code = ABS_MT_POSITION_Y;
+ MT_STORE_FIELD(y);
+ }

- hid_map_usage(hi, usage, bit, max, EV_ABS, code);
set_abs(hi->input, code, field, cls->sn_move);
- mt_store_field(usage, td, hi);
+
return 1;
}
return 0;
@@ -653,40 +712,33 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
switch (usage->hid) {
case HID_DG_INRANGE:
if (app->quirks & MT_QUIRK_HOVERING) {
- hid_map_usage(hi, usage, bit, max,
- EV_ABS, ABS_MT_DISTANCE);
input_set_abs_params(hi->input,
ABS_MT_DISTANCE, 0, 1, 0, 0);
}
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(inrange_state);
return 1;
case HID_DG_CONFIDENCE:
if ((cls->name == MT_CLS_WIN_8 ||
cls->name == MT_CLS_WIN_8_DUAL) &&
field->application == HID_DG_TOUCHPAD)
app->quirks |= MT_QUIRK_CONFIDENCE;
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(confidence_state);
return 1;
case HID_DG_TIPSWITCH:
- hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
input_set_capability(hi->input, EV_KEY, BTN_TOUCH);
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(tip_state);
return 1;
case HID_DG_CONTACTID:
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(contactid);
app->touches_by_report++;
return 1;
case HID_DG_WIDTH:
- hid_map_usage(hi, usage, bit, max,
- EV_ABS, ABS_MT_TOUCH_MAJOR);
if (!(app->quirks & MT_QUIRK_NO_AREA))
set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
cls->sn_width);
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(w);
return 1;
case HID_DG_HEIGHT:
- hid_map_usage(hi, usage, bit, max,
- EV_ABS, ABS_MT_TOUCH_MINOR);
if (!(app->quirks & MT_QUIRK_NO_AREA)) {
set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
cls->sn_height);
@@ -700,38 +752,23 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
input_set_abs_params(hi->input,
ABS_MT_ORIENTATION, 0, 1, 0, 0);
}
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(h);
return 1;
case HID_DG_TIPPRESSURE:
- hid_map_usage(hi, usage, bit, max,
- EV_ABS, ABS_MT_PRESSURE);
set_abs(hi->input, ABS_MT_PRESSURE, field,
cls->sn_pressure);
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(p);
return 1;
case HID_DG_SCANTIME:
- hid_map_usage(hi, usage, bit, max,
- 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;
- app->scantime_index = field->index;
- app->scantime_val_index = usage->usage_index;
+ app->scantime = &field->value[usage->usage_index];
+ app->scantime_logical_max = field->logical_maximum;
return 1;
case HID_DG_CONTACTCOUNT:
- /* Ignore if indexes are out of bounds. */
- if (field->index >= field->report->maxfield ||
- usage->usage_index >= field->report_count)
- return 1;
- app->cc_index = field->index;
- app->cc_value_index = usage->usage_index;
+ app->have_contact_count = true;
+ app->raw_cc = &field->value[usage->usage_index];
return 1;
case HID_DG_AZIMUTH:
- hid_map_usage(hi, usage, bit, max,
- EV_ABS, ABS_MT_ORIENTATION);
/*
* Azimuth has the range of [0, MAX) representing a full
* revolution. Set ABS_MT_ORIENTATION to a quarter of
@@ -742,11 +779,10 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
field->logical_maximum / 4,
cls->sn_move ?
field->logical_maximum / cls->sn_move : 0, 0);
- mt_store_field(usage, td, hi);
+ MT_STORE_FIELD(a);
return 1;
case HID_DG_CONTACTMAX:
- /* we don't set td->last_slot_field as contactcount and
- * contact max are global to the report */
+ /* contact max are global to the report */
return -1;
case HID_DG_TOUCH:
/* Legacy devices use TIPSWITCH and not TOUCH.
@@ -779,95 +815,24 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
}

static int mt_compute_slot(struct mt_device *td, struct mt_application *app,
+ struct mt_usages *slot,
struct input_dev *input)
{
__s32 quirks = app->quirks;

if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
- return app->curdata.contactid;
+ return *slot->contactid;

if (quirks & MT_QUIRK_CYPRESS)
- return cypress_compute_slot(app);
+ return cypress_compute_slot(app, slot);

if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
return app->num_received;

if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
- return app->curdata.contactid - 1;
+ return *slot->contactid - 1;

- return input_mt_get_slot_by_key(input, app->curdata.contactid);
-}
-
-/*
- * this function is called when a whole contact has been processed,
- * so that it can assign it to a slot and store the data there
- */
-static void mt_complete_slot(struct mt_device *td, struct mt_application *app,
- struct input_dev *input)
-{
- if ((app->quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
- app->num_received >= app->num_expected)
- return;
-
- if (app->curvalid || (app->quirks & MT_QUIRK_ALWAYS_VALID)) {
- int active;
- int slotnum = mt_compute_slot(td, app, input);
- struct mt_slot *s = &app->curdata;
- struct input_mt *mt = input->mt;
-
- if (slotnum < 0 || slotnum >= td->maxcontacts)
- return;
-
- if ((app->quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
- struct input_mt_slot *slot = &mt->slots[slotnum];
- if (input_mt_is_active(slot) &&
- input_mt_is_used(mt, slot))
- return;
- }
-
- if (!(app->quirks & MT_QUIRK_CONFIDENCE))
- s->confidence_state = true;
- active = (s->touch_state || s->inrange_state) &&
- s->confidence_state;
-
- input_mt_slot(input, slotnum);
- input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
- if (active) {
- /* this finger is in proximity of the sensor */
- int wide = (s->w > s->h);
- int major = max(s->w, s->h);
- int minor = min(s->w, s->h);
- int orientation = wide;
-
- if (s->has_azimuth)
- orientation = s->a;
-
- /*
- * divided by two to match visual scale of touch
- * for devices with this quirk
- */
- if (app->quirks & MT_QUIRK_TOUCH_SIZE_SCALING) {
- major = major >> 1;
- minor = minor >> 1;
- }
-
- input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
- input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
- input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx);
- input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
- input_event(input, EV_ABS, ABS_MT_DISTANCE,
- !s->touch_state);
- input_event(input, EV_ABS, ABS_MT_ORIENTATION,
- orientation);
- input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
- input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
- input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
-
- set_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
- }
- }
-
- app->num_received++;
+ return input_mt_get_slot_by_key(input, *slot->contactid);
}

/*
@@ -893,8 +858,7 @@ static void mt_sync_frame(struct mt_device *td, struct mt_application *app,
clear_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
}

-static int mt_compute_timestamp(struct mt_application *app,
- struct hid_field *field, __s32 value)
+static int mt_compute_timestamp(struct mt_application *app, __s32 value)
{
long delta = value - app->prev_scantime;
unsigned long jdelta = jiffies_to_usecs(jiffies - app->jiffies);
@@ -902,7 +866,7 @@ static int mt_compute_timestamp(struct mt_application *app,
app->jiffies = jiffies;

if (delta < 0)
- delta += field->logical_maximum;
+ delta += app->scantime_logical_max;

/* HID_DG_SCANTIME is expressed in 100us, we want it in us. */
delta *= 100;
@@ -924,64 +888,69 @@ static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
return 1;
}

-static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
- struct hid_usage *usage, __s32 value,
- struct mt_application *app, bool first_packet)
+static int mt_process_slot(struct mt_device *td, struct input_dev *input,
+ struct mt_application *app,
+ struct mt_usages *slot)
{
- struct mt_device *td = hid_get_drvdata(hid);
+ struct input_mt *mt = input->mt;
__s32 quirks = app->quirks;
- struct input_dev *input = field->hidinput->input;
+ bool valid = true;
+ bool confidence_state = true;
+ bool inrange_state = false;
+ int active;
+ int slotnum;

- if (hid->claimed & HID_CLAIMED_INPUT) {
- switch (usage->hid) {
- case HID_DG_INRANGE:
- if (quirks & MT_QUIRK_VALID_IS_INRANGE)
- app->curvalid = value;
- if (quirks & MT_QUIRK_HOVERING)
- app->curdata.inrange_state = value;
- break;
- case HID_DG_TIPSWITCH:
- if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
- app->curvalid = value;
- app->curdata.touch_state = value;
- break;
- case HID_DG_CONFIDENCE:
- if (quirks & MT_QUIRK_CONFIDENCE)
- app->curdata.confidence_state = value;
- if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
- app->curvalid = value;
- break;
- case HID_DG_CONTACTID:
- app->curdata.contactid = value;
- break;
- case HID_DG_TIPPRESSURE:
- app->curdata.p = value;
- break;
- case HID_GD_X:
- if (usage->code == ABS_MT_TOOL_X)
- app->curdata.cx = value;
- else
- app->curdata.x = value;
- break;
- case HID_GD_Y:
- if (usage->code == ABS_MT_TOOL_Y)
- app->curdata.cy = value;
- else
- app->curdata.y = value;
- break;
- case HID_DG_WIDTH:
- app->curdata.w = value;
- break;
- case HID_DG_HEIGHT:
- app->curdata.h = value;
- break;
- case HID_DG_SCANTIME:
- app->timestamp = mt_compute_timestamp(app, field,
- value);
- break;
- case HID_DG_CONTACTCOUNT:
- break;
- case HID_DG_AZIMUTH:
+ if (!slot)
+ return -EINVAL;
+
+ if ((quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
+ app->num_received >= app->num_expected)
+ return -EAGAIN;
+
+ if (!(quirks & MT_QUIRK_ALWAYS_VALID)) {
+ if (quirks & MT_QUIRK_VALID_IS_INRANGE)
+ valid = *slot->inrange_state;
+ if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
+ valid = *slot->tip_state;
+ if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
+ valid = *slot->confidence_state;
+
+ if (!valid)
+ return 0;
+ }
+
+ slotnum = mt_compute_slot(td, app, slot, input);
+ if (slotnum < 0 || slotnum >= td->maxcontacts)
+ return 0;
+
+ if ((quirks & MT_QUIRK_IGNORE_DUPLICATES) && mt) {
+ struct input_mt_slot *i_slot = &mt->slots[slotnum];
+
+ if (input_mt_is_active(i_slot) &&
+ input_mt_is_used(mt, i_slot))
+ return -EAGAIN;
+ }
+
+ if (quirks & MT_QUIRK_CONFIDENCE)
+ confidence_state = *slot->confidence_state;
+
+ if (quirks & MT_QUIRK_HOVERING)
+ inrange_state = *slot->inrange_state;
+
+ active = (*slot->tip_state || inrange_state) && confidence_state;
+
+ input_mt_slot(input, slotnum);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
+ if (active) {
+ /* this finger is in proximity of the sensor */
+ int wide = (*slot->w > *slot->h);
+ int major = max(*slot->w, *slot->h);
+ int minor = min(*slot->w, *slot->h);
+ int orientation = wide;
+ int max_azimuth;
+ int azimuth;
+
+ if (slot->a != DEFAULT_ZERO) {
/*
* Azimuth is counter-clockwise and ranges from [0, MAX)
* (a full revolution). Convert it to clockwise ranging
@@ -992,52 +961,76 @@ static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
* out of range to [-MAX/2, MAX/2] to report an upside
* down ellipsis.
*/
- if (value > field->logical_maximum / 2)
- value -= field->logical_maximum;
- app->curdata.a = -value;
- app->curdata.has_azimuth = true;
- break;
- case HID_DG_TOUCH:
- /* do nothing */
- break;
+ azimuth = *slot->a;
+ max_azimuth = input_abs_get_max(input,
+ ABS_MT_ORIENTATION);
+ if (azimuth > max_azimuth * 2)
+ azimuth -= max_azimuth * 4;
+ orientation = -azimuth;
+ }

- 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 ((quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
- !first_packet)
- return;
+ /*
+ * divided by two to match visual scale of touch
+ * for devices with this quirk
+ */
+ if (quirks & MT_QUIRK_TOUCH_SIZE_SCALING) {
+ major = major >> 1;
+ minor = minor >> 1;
+ }

- /*
- * 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 ((quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
- usage->type == EV_KEY && usage->code == BTN_LEFT) {
- app->left_button_state |= value;
- return;
- }
+ input_event(input, EV_ABS, ABS_MT_POSITION_X, *slot->x);
+ input_event(input, EV_ABS, ABS_MT_POSITION_Y, *slot->y);
+ input_event(input, EV_ABS, ABS_MT_TOOL_X, *slot->cx);
+ input_event(input, EV_ABS, ABS_MT_TOOL_Y, *slot->cy);
+ input_event(input, EV_ABS, ABS_MT_DISTANCE, !*slot->tip_state);
+ input_event(input, EV_ABS, ABS_MT_ORIENTATION, orientation);
+ input_event(input, EV_ABS, ABS_MT_PRESSURE, *slot->p);
+ input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
+ input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
+
+ set_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
+ }

- if (usage->type)
- input_event(input, usage->type, usage->code,
- value);
+ return 0;
+}
+
+static void mt_process_mt_event(struct hid_device *hid,
+ struct mt_application *app,
+ struct hid_field *field,
+ struct hid_usage *usage,
+ __s32 value,
+ bool first_packet)
+{
+ __s32 quirks = app->quirks;
+ struct input_dev *input = field->hidinput->input;
+
+ if (!usage->type || !(hid->claimed & HID_CLAIMED_INPUT))
+ return;
+
+ if (quirks & MT_QUIRK_WIN8_PTP_BUTTONS) {
+
+ /*
+ * For Win8 PTP touchpads we should only look at
+ * non finger/touch events in the first_packet of a
+ * (possible) multi-packet frame.
+ */
+ if (!first_packet)
return;
- }

- if (usage->usage_index + 1 == field->report_count) {
- /* we only take into account the last report. */
- if (usage->hid == app->last_slot_field)
- mt_complete_slot(td, app,
- field->hidinput->input);
+ /*
+ * 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 (usage->type == EV_KEY && usage->code == BTN_LEFT) {
+ app->left_button_state |= value;
+ return;
}
-
}
+
+ input_event(input, usage->type, usage->code, value);
}

static void mt_touch_report(struct hid_device *hid,
@@ -1047,6 +1040,8 @@ static void mt_touch_report(struct hid_device *hid,
struct hid_report *report = rdata->report;
struct mt_application *app = rdata->application;
struct hid_field *field;
+ struct input_dev *input;
+ struct mt_usages *slot;
bool first_packet;
unsigned count;
int r, n;
@@ -1057,18 +1052,16 @@ static void mt_touch_report(struct hid_device *hid,
if (test_and_set_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
return;

+ scantime = *app->scantime;
+ app->timestamp = mt_compute_timestamp(app, scantime);
+ if (app->raw_cc != DEFAULT_ZERO)
+ contact_count = *app->raw_cc;
+
/*
* Includes multi-packet support where subsequent
* packets are sent with zero contactcount.
*/
- if (app->scantime_index >= 0) {
- field = report->field[app->scantime_index];
- scantime = field->value[app->scantime_val_index];
- }
- if (app->cc_index >= 0) {
- field = report->field[app->cc_index];
- contact_count = field->value[app->cc_value_index];
-
+ if (contact_count >= 0) {
/*
* For Win8 PTPs the first packet (td->num_received == 0) may
* have a contactcount of 0 if there only is a button event.
@@ -1087,6 +1080,14 @@ static void mt_touch_report(struct hid_device *hid,
app->prev_scantime = scantime;

first_packet = app->num_received == 0;
+
+ input = report->field[0]->hidinput->input;
+
+ list_for_each_entry(slot, &app->mt_usages, list) {
+ if (!mt_process_slot(td, input, app, slot))
+ app->num_received++;
+ }
+
for (r = 0; r < report->maxfield; r++) {
field = report->field[r];
count = field->report_count;
@@ -1095,12 +1096,13 @@ static void mt_touch_report(struct hid_device *hid,
continue;

for (n = 0; n < count; n++)
- mt_process_mt_event(hid, field, &field->usage[n],
- field->value[n], app, first_packet);
+ mt_process_mt_event(hid, app, field,
+ &field->usage[n], field->value[n],
+ first_packet);
}

if (app->num_received >= app->num_expected)
- mt_sync_frame(td, app, report->field[0]->hidinput->input);
+ mt_sync_frame(td, app, input);

/*
* Windows 8 specs says 2 things:
@@ -1392,7 +1394,7 @@ static void mt_post_parse_default_settings(struct mt_device *td,
__s32 quirks = app->quirks;

/* unknown serial device needs special quirks */
- if (app->touches_by_report == 1) {
+ if (list_is_singular(&app->mt_usages)) {
quirks |= MT_QUIRK_ALWAYS_VALID;
quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
@@ -1405,16 +1407,7 @@ static void mt_post_parse_default_settings(struct mt_device *td,

static void mt_post_parse(struct mt_device *td, struct mt_application *app)
{
- struct mt_fields *f = td->fields;
-
- if (app->touches_by_report > 0) {
- int field_count_per_touch;
-
- field_count_per_touch = f->length / app->touches_by_report;
- app->last_slot_field = f->usages[field_count_per_touch - 1];
- }
-
- if (app->cc_index < 0)
+ if (!app->have_contact_count)
app->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
}

@@ -1597,13 +1590,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
INIT_LIST_HEAD(&td->applications);
INIT_LIST_HEAD(&td->reports);

- td->fields = devm_kzalloc(&hdev->dev, sizeof(struct mt_fields),
- GFP_KERNEL);
- if (!td->fields) {
- dev_err(&hdev->dev, "cannot allocate multitouch fields data\n");
- return -ENOMEM;
- }
-
if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
td->serial_maybe = true;

@@ -1639,10 +1625,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)

mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);

- /* release .fields memory as it is not used anymore */
- devm_kfree(&hdev->dev, td->fields);
- td->fields = NULL;
-
return 0;
}

--
2.14.3
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