Merge branch 'for-4.19/multitouch-multiaxis' into for-linus

Multitouch updates:

- Dial support
- Palm rejection for touchscreens
- a few small assorted fixes

Documentation/input/multi-touch-protocol.rst

···
 ABS_MT_TOOL_TYPE
     The type of approaching tool. A lot of kernel drivers cannot distinguish
     between different tool types, such as a finger or a pen. In such cases, the
-    event should be omitted. The protocol currently supports MT_TOOL_FINGER,
-    MT_TOOL_PEN, and MT_TOOL_PALM [#f2]_. For type B devices, this event is
-    handled by input core; drivers should instead use
-    input_mt_report_slot_state(). A contact's ABS_MT_TOOL_TYPE may change over
-    time while still touching the device, because the firmware may not be able
-    to determine which tool is being used when it first appears.
+    event should be omitted. The protocol currently mainly supports
+    MT_TOOL_FINGER, MT_TOOL_PEN, and MT_TOOL_PALM [#f2]_.
+    For type B devices, this event is handled by input core; drivers should
+    instead use input_mt_report_slot_state(). A contact's ABS_MT_TOOL_TYPE may
+    change over time while still touching the device, because the firmware may
+    not be able to determine which tool is being used when it first appears.
 
 ABS_MT_BLOB_ID
     The BLOB_ID groups several packets together into one arbitrarily shaped

drivers/hid/hid-core.c

···
 
 	usage = parser->local.usage[0];
 
-	if (parser->collection_stack_ptr == HID_COLLECTION_STACK_SIZE) {
-		hid_err(parser->device, "collection stack overflow\n");
-		return -EINVAL;
+	if (parser->collection_stack_ptr == parser->collection_stack_size) {
+		unsigned int *collection_stack;
+		unsigned int new_size = parser->collection_stack_size +
+					HID_COLLECTION_STACK_SIZE;
+
+		collection_stack = krealloc(parser->collection_stack,
+					    new_size * sizeof(unsigned int),
+					    GFP_KERNEL);
+		if (!collection_stack)
+			return -ENOMEM;
+
+		parser->collection_stack = collection_stack;
+		parser->collection_stack_size = new_size;
 	}
 
 	if (parser->device->maxcollection == parser->device->collection_size) {
···
 		break;
 	}
 
+	kfree(parser->collection_stack);
 	vfree(parser);
 	return 0;
 }

drivers/hid/hid-input.c

···
 		case HID_GD_WIRELESS_RADIO_CTLS:
 			suffix = "Wireless Radio Control";
 			break;
+		case HID_GD_SYSTEM_MULTIAXIS:
+			suffix = "System Multi Axis";
+			break;
 		default:
 			break;
 		}

drivers/hid/hid-microsoft.c

···
 
 #include "hid-ids.h"
 
-#define MS_HIDINPUT		0x01
-#define MS_ERGONOMY		0x02
-#define MS_PRESENTER		0x04
-#define MS_RDESC		0x08
-#define MS_NOGET		0x10
-#define MS_DUPLICATE_USAGES	0x20
+#define MS_HIDINPUT		BIT(0)
+#define MS_ERGONOMY		BIT(1)
+#define MS_PRESENTER		BIT(2)
+#define MS_RDESC		BIT(3)
+#define MS_NOGET		BIT(4)
+#define MS_DUPLICATE_USAGES	BIT(5)
+#define MS_SURFACE_DIAL		BIT(6)
 
 static __u8 *ms_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 		unsigned int *rsize)
···
 	return 1;
 }
 
+static int ms_surface_dial_quirk(struct hid_input *hi, struct hid_field *field,
+		struct hid_usage *usage, unsigned long **bit, int *max)
+{
+	switch (usage->hid & HID_USAGE_PAGE) {
+	case 0xff070000:
+		/* fall-through */
+	case HID_UP_DIGITIZER:
+		/* ignore those axis */
+		return -1;
+	case HID_UP_GENDESK:
+		switch (usage->hid) {
+		case HID_GD_X:
+			/* fall-through */
+		case HID_GD_Y:
+			/* fall-through */
+		case HID_GD_RFKILL_BTN:
+			/* ignore those axis */
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
 static int ms_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 		struct hid_field *field, struct hid_usage *usage,
 		unsigned long **bit, int *max)
···
 	if ((quirks & MS_PRESENTER) &&
 			ms_presenter_8k_quirk(hi, usage, bit, max))
 		return 1;
+
+	if (quirks & MS_SURFACE_DIAL) {
+		int ret = ms_surface_dial_quirk(hi, field, usage, bit, max);
+
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }
···
 	if (quirks & MS_NOGET)
 		hdev->quirks |= HID_QUIRK_NOGET;
 
+	if (quirks & MS_SURFACE_DIAL)
+		hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
+
 	ret = hid_parse(hdev);
 	if (ret) {
 		hid_err(hdev, "parse failed\n");
···
 
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_PRESENTER_8K_BT),
 		.driver_data = MS_PRESENTER },
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_MICROSOFT, 0x091B),
+		.driver_data = MS_SURFACE_DIAL },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, ms_devices);

drivers/hid/hid-multitouch.c

···
  */
 
 /*
- * This driver is regularly tested thanks to the tool hid-test[1].
- * This tool relies on hid-replay[2] and a database of hid devices[3].
+ * This driver is regularly tested thanks to the test suite in hid-tools[1].
  * Please run these regression tests before patching this module so that
  * your patch won't break existing known devices.
  *
- * [1] https://github.com/bentiss/hid-test
- * [2] https://github.com/bentiss/hid-replay
- * [3] https://github.com/bentiss/hid-devices
+ * [1] https://gitlab.freedesktop.org/libevdev/hid-tools
  */
 
 #include <linux/device.h>
···
 #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;
+
+	__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 */
+
+	unsigned long *pending_palm_slots;	/* slots where we reported palm
+						 * and need to release */
+
+	__u8 num_received;	/* how many contacts we received */
+	__u8 num_expected;	/* expected last contact index */
+	__u8 buttons_count;	/* number of physical buttons per touchpad */
+	__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
+				 */
+
+	__s32 dev_time;		/* the scan time provided by the device */
+	unsigned long jiffies;	/* the frame's jiffies */
+	int timestamp;		/* the timestamp to be sent */
+	int prev_scantime;		/* scantime reported previously */
+
+	bool have_contact_count;
 };
 
 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;
+	struct mt_application *application;
+	bool is_mt_collection;
 };
 
 struct mt_device {
-	struct mt_slot curdata;	/* placeholder of incoming data */
 	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_*) */
-	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 */
-	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 */
 	__u8 inputmode_value;	/* InputMode HID feature value */
-	__u8 num_received;	/* how many contacts we received */
-	__u8 num_expected;	/* expected last contact index */
 	__u8 maxcontacts;
-	__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 */
-	__u8 buttons_count;	/* number of physical buttons per touchpad */
 	bool is_buttonpad;	/* is this device a button pad? */
 	bool serial_maybe;	/* need to check for serial protocol */
-	bool curvalid;		/* is the current contact valid? */
-	unsigned mt_flags;	/* flags to pass to input-mt */
-	__s32 dev_time;		/* the scan time provided by the device */
-	unsigned long jiffies;	/* the frame's jiffies */
-	int timestamp;		/* the timestamp to be sent */
+
+	struct list_head applications;
+	struct list_head reports;
 };
 
-static void mt_post_parse_default_settings(struct mt_device *td);
-static void mt_post_parse(struct mt_device *td);
+static void mt_post_parse_default_settings(struct mt_device *td,
+					   struct mt_application *app);
+static void mt_post_parse(struct mt_device *td, struct mt_application *app);
 
 /* classes of device behavior */
 #define MT_CLS_DEFAULT				0x0001
···
  * to a valid contact that was just read.
  */
 
-static int cypress_compute_slot(struct mt_device *td)
+static int cypress_compute_slot(struct mt_application *application,
+				struct mt_usages *slot)
 {
-	if (td->curdata.contactid != 0 || td->num_received == 0)
-		return td->curdata.contactid;
+	if (*slot->contactid != 0 || application->num_received == 0)
+		return *slot->contactid;
 	else
 		return -1;
 }
 
-static struct mt_class mt_classes[] = {
+static const struct mt_class mt_classes[] = {
 	{ .name = MT_CLS_DEFAULT,
 		.quirks = MT_QUIRK_ALWAYS_VALID |
 			MT_QUIRK_CONTACT_CNT_ACCURATE },
···
 {
 	struct hid_device *hdev = to_hid_device(dev);
 	struct mt_device *td = hid_get_drvdata(hdev);
+	struct mt_application *application;
 
 	unsigned long val;
 
···
 
 	td->mtclass.quirks = val;
 
-	if (td->cc_index < 0)
-		td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
+	list_for_each_entry(application, &td->applications, list) {
+		application->quirks = val;
+		if (!application->have_contact_count)
+			application->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
+	}
 
 	return count;
 }
···
 	input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
 }
 
-static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
-		struct hid_input *hi)
+static struct mt_usages *mt_allocate_usage(struct hid_device *hdev,
+					   struct mt_application *application)
 {
-	struct mt_fields *f = td->fields;
+	struct mt_usages *usage;
 
-	if (f->length >= HID_MAX_FIELDS)
+	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)
+{
+	struct mt_application *mt_application;
+
+	mt_application = devm_kzalloc(&td->hdev->dev, sizeof(*mt_application),
+				      GFP_KERNEL);
+	if (!mt_application)
+		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;
+
+	/*
+	 * Model touchscreens providing buttons as touchpads.
+	 */
+	if (application == HID_DG_TOUCHPAD) {
+		mt_application->mt_flags |= INPUT_MT_POINTER;
+		td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
+	}
+
+	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);
+
+	return mt_application;
+}
+
+static struct mt_application *mt_find_application(struct mt_device *td,
+						  unsigned int application)
+{
+	struct mt_application *tmp, *mt_application = NULL;
+
+	list_for_each_entry(tmp, &td->applications, list) {
+		if (application == tmp->application) {
+			mt_application = tmp;
+			break;
+		}
+	}
+
+	if (!mt_application)
+		mt_application = mt_allocate_application(td, application);
+
+	return mt_application;
+}
+
+static struct mt_report_data *mt_allocate_report_data(struct mt_device *td,
+						      struct hid_report *report)
+{
+	struct mt_report_data *rdata;
+	struct hid_field *field;
+	int r, n;
+
+	rdata = devm_kzalloc(&td->hdev->dev, sizeof(*rdata), GFP_KERNEL);
+	if (!rdata)
+		return NULL;
+
+	rdata->report = report;
+	rdata->application = mt_find_application(td, report->application);
+
+	if (!rdata->application) {
+		devm_kfree(&td->hdev->dev, rdata);
+		return NULL;
+	}
+
+	for (r = 0; r < report->maxfield; r++) {
+		field = report->field[r];
+
+		if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
+			continue;
+
+		for (n = 0; n < field->report_count; n++) {
+			if (field->usage[n].hid == HID_DG_CONTACTID)
+				rdata->is_mt_collection = true;
+		}
+	}
+
+	list_add_tail(&rdata->list, &td->reports);
+
+	return rdata;
+}
+
+static struct mt_report_data *mt_find_report_data(struct mt_device *td,
+						  struct hid_report *report)
+{
+	struct mt_report_data *tmp, *rdata = NULL;
+
+	list_for_each_entry(tmp, &td->reports, list) {
+		if (report == tmp->report) {
+			rdata = tmp;
+			break;
+		}
+	}
+
+	if (!rdata)
+		rdata = mt_allocate_report_data(td, report);
+
+	return rdata;
+}
+
+static void mt_store_field(struct hid_device *hdev,
+			   struct mt_application *application,
+			   __s32 *value,
+			   size_t offset)
+{
+	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 (!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)
+		unsigned long **bit, int *max, struct mt_application *app)
 {
 	struct mt_device *td = hid_get_drvdata(hdev);
 	struct mt_class *cls = &td->mtclass;
 	int code;
 	struct hid_usage *prev_usage = NULL;
 
-	if (field->application == HID_DG_TOUCHSCREEN)
-		td->mt_flags |= INPUT_MT_DIRECT;
-
 	/*
 	 * Model touchscreens providing buttons as touchpads.
 	 */
-	if (field->application == HID_DG_TOUCHPAD ||
+	if (field->application == HID_DG_TOUCHSCREEN &&
 	    (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
-		td->mt_flags |= INPUT_MT_POINTER;
+		app->mt_flags |= INPUT_MT_POINTER;
 		td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
 	}
 
 	/* count the buttons on touchpads */
 	if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
-		td->buttons_count++;
+		app->buttons_count++;
 
 	if (usage->usage_index)
 		prev_usage = &field->usage[usage->usage_index - 1];
···
 		switch (usage->hid) {
 		case HID_GD_X:
 			if (prev_usage && (prev_usage->hid == usage->hid)) {
-				hid_map_usage(hi, usage, bit, max,
-					EV_ABS, ABS_MT_TOOL_X);
-				set_abs(hi->input, ABS_MT_TOOL_X, field,
-					cls->sn_move);
+				code = ABS_MT_TOOL_X;
+				MT_STORE_FIELD(cx);
 			} else {
-				hid_map_usage(hi, usage, bit, max,
-					EV_ABS, ABS_MT_POSITION_X);
-				set_abs(hi->input, ABS_MT_POSITION_X, field,
-					cls->sn_move);
+				code = ABS_MT_POSITION_X;
+				MT_STORE_FIELD(x);
 			}
 
-			mt_store_field(usage, td, hi);
+			set_abs(hi->input, code, field, cls->sn_move);
+
+			/*
+			 * A system multi-axis that exports X and Y has a high
+			 * chance of being used directly on a surface
+			 */
+			if (field->application == HID_GD_SYSTEM_MULTIAXIS) {
+				__set_bit(INPUT_PROP_DIRECT,
+					  hi->input->propbit);
+				input_set_abs_params(hi->input,
+						     ABS_MT_TOOL_TYPE,
+						     MT_TOOL_DIAL,
+						     MT_TOOL_DIAL, 0, 0);
+			}
+
 			return 1;
 		case HID_GD_Y:
 			if (prev_usage && (prev_usage->hid == usage->hid)) {
-				hid_map_usage(hi, usage, bit, max,
-					EV_ABS, ABS_MT_TOOL_Y);
-				set_abs(hi->input, ABS_MT_TOOL_Y, field,
-					cls->sn_move);
+				code = ABS_MT_TOOL_Y;
+				MT_STORE_FIELD(cy);
 			} else {
-				hid_map_usage(hi, usage, bit, max,
-					EV_ABS, ABS_MT_POSITION_Y);
-				set_abs(hi->input, ABS_MT_POSITION_Y, field,
-					cls->sn_move);
+				code = ABS_MT_POSITION_Y;
+				MT_STORE_FIELD(y);
 			}
 
-			mt_store_field(usage, td, hi);
+			set_abs(hi->input, code, field, cls->sn_move);
+
 			return 1;
 		}
 		return 0;
···
 	case HID_UP_DIGITIZER:
 		switch (usage->hid) {
 		case HID_DG_INRANGE:
-			if (cls->quirks & MT_QUIRK_HOVERING) {
-				hid_map_usage(hi, usage, bit, max,
-					EV_ABS, ABS_MT_DISTANCE);
+			if (app->quirks & MT_QUIRK_HOVERING) {
 				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)
-				cls->quirks |= MT_QUIRK_CONFIDENCE;
-			mt_store_field(usage, td, hi);
+				(field->application == HID_DG_TOUCHPAD ||
+				 field->application == HID_DG_TOUCHSCREEN))
+				app->quirks |= MT_QUIRK_CONFIDENCE;
+
+			if (app->quirks & MT_QUIRK_CONFIDENCE)
+				input_set_abs_params(hi->input,
+						     ABS_MT_TOOL_TYPE,
+						     MT_TOOL_FINGER,
+						     MT_TOOL_PALM, 0, 0);
+
+			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);
+			if (field->application != HID_GD_SYSTEM_MULTIAXIS)
+				input_set_capability(hi->input,
+						     EV_KEY, BTN_TOUCH);
+			MT_STORE_FIELD(tip_state);
 			return 1;
 		case HID_DG_CONTACTID:
-			mt_store_field(usage, td, hi);
-			td->touches_by_report++;
-			td->mt_report_id = field->report->id;
+			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 (!(cls->quirks & MT_QUIRK_NO_AREA))
+			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 (!(cls->quirks & MT_QUIRK_NO_AREA)) {
+			if (!(app->quirks & MT_QUIRK_NO_AREA)) {
 				set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
 					cls->sn_height);
 
···
 					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);
-			/* 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;
-			/*
-			 * We don't set td->last_slot_field as scan time is
-			 * global to the report.
-			 */
+			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;
-			td->cc_index = field->index;
-			td->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
···
 				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.
···
 		 * MS PTP spec says that external buttons left and right have
 		 * usages 2 and 3.
 		 */
-		if ((cls->quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
+		if ((app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
 		    field->application == HID_DG_TOUCHPAD &&
 		    (usage->hid & HID_USAGE) > 1)
 			code--;
+
+		if (field->application == HID_GD_SYSTEM_MULTIAXIS)
+			code = BTN_0  + ((usage->hid - 1) & HID_USAGE);
+
 		hid_map_usage(hi, usage, bit, max, EV_KEY, code);
 		input_set_capability(hi->input, EV_KEY, code);
 		return 1;
···
 	return 0;
 }
 
-static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
+static int mt_compute_slot(struct mt_device *td, struct mt_application *app,
+			   struct mt_usages *slot,
+			   struct input_dev *input)
 {
-	__s32 quirks = td->mtclass.quirks;
+	__s32 quirks = app->quirks;
 
 	if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
-		return td->curdata.contactid;
+		return *slot->contactid;
 
 	if (quirks & MT_QUIRK_CYPRESS)
-		return cypress_compute_slot(td);
+		return cypress_compute_slot(app, slot);
 
 	if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
-		return td->num_received;
+		return app->num_received;
 
 	if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
-		return td->curdata.contactid - 1;
+		return *slot->contactid - 1;
 
-	return input_mt_get_slot_by_key(input, td->curdata.contactid);
+	return input_mt_get_slot_by_key(input, *slot->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 input_dev *input)
+static void mt_release_pending_palms(struct mt_device *td,
+				     struct mt_application *app,
+				     struct input_dev *input)
 {
-	if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
-	    td->num_received >= td->num_expected)
-		return;
+	int slotnum;
+	bool need_sync = false;
 
-	if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
-		int active;
-		int slotnum = mt_compute_slot(td, input);
-		struct mt_slot *s = &td->curdata;
-		struct input_mt *mt = input->mt;
-
-		if (slotnum < 0 || slotnum >= td->maxcontacts)
-			return;
-
-		if ((td->mtclass.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 (!(td->mtclass.quirks & MT_QUIRK_CONFIDENCE))
-			s->confidence_state = true;
-		active = (s->touch_state || s->inrange_state) &&
-							s->confidence_state;
+	for_each_set_bit(slotnum, app->pending_palm_slots, td->maxcontacts) {
+		clear_bit(slotnum, app->pending_palm_slots);
 
 		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;
+		input_mt_report_slot_state(input, MT_TOOL_PALM, false);
 
-			if (s->has_azimuth)
-				orientation = s->a;
-
-			/*
-			 * divided by two to match visual scale of touch
-			 * for devices with this quirk
-			 */
-			if (td->mtclass.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);
-		}
+		need_sync = true;
 	}
 
-	td->num_received++;
+	if (need_sync) {
+		input_mt_sync_frame(input);
+		input_sync(input);
+	}
 }
 
 /*
  * this function is called when a whole packet has been received and processed,
  * so that it can decide what to send to the input layer.
  */
-static void mt_sync_frame(struct mt_device *td, struct input_dev *input)
+static void mt_sync_frame(struct mt_device *td, struct mt_application *app,
+			  struct input_dev *input)
 {
-	if (td->mtclass.quirks & MT_QUIRK_WIN8_PTP_BUTTONS)
-		input_event(input, EV_KEY, BTN_LEFT, td->left_button_state);
+	if (app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS)
+		input_event(input, EV_KEY, BTN_LEFT, app->left_button_state);
 
 	input_mt_sync_frame(input);
-	input_event(input, EV_MSC, MSC_TIMESTAMP, td->timestamp);
+	input_event(input, EV_MSC, MSC_TIMESTAMP, app->timestamp);
 	input_sync(input);
-	td->num_received = 0;
-	td->left_button_state = 0;
+
+	mt_release_pending_palms(td, app, input);
+
+	app->num_received = 0;
+	app->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
···
 	clear_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
 }
 
-static int mt_compute_timestamp(struct mt_device *td, struct hid_field *field,
-		__s32 value)
+static int mt_compute_timestamp(struct mt_application *app, __s32 value)
 {
-	long delta = value - td->dev_time;
-	unsigned long jdelta = jiffies_to_usecs(jiffies - td->jiffies);
+	long delta = value - app->prev_scantime;
+	unsigned long jdelta = jiffies_to_usecs(jiffies - app->jiffies);
 
-	td->jiffies = jiffies;
-	td->dev_time = value;
+	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;
···
 		/* No data received for a while, resync the timestamp. */
 		return 0;
 	else
-		return td->timestamp + delta;
+		return app->timestamp + delta;
 }
 
 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,
-				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);
-	__s32 quirks = td->mtclass.quirks;
-	struct input_dev *input = field->hidinput->input;
+	struct input_mt *mt = input->mt;
+	__s32 quirks = app->quirks;
+	bool valid = true;
+	bool confidence_state = true;
+	bool inrange_state = false;
+	int active;
+	int slotnum;
+	int tool = MT_TOOL_FINGER;
 
-	if (hid->claimed & HID_CLAIMED_INPUT) {
-		switch (usage->hid) {
-		case HID_DG_INRANGE:
-			if (quirks & MT_QUIRK_VALID_IS_INRANGE)
-				td->curvalid = value;
-			if (quirks & MT_QUIRK_HOVERING)
-				td->curdata.inrange_state = value;
-			break;
-		case HID_DG_TIPSWITCH:
-			if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
-				td->curvalid = value;
-			td->curdata.touch_state = value;
-			break;
-		case HID_DG_CONFIDENCE:
-			if (quirks & MT_QUIRK_CONFIDENCE)
-				td->curdata.confidence_state = value;
-			if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)
-				td->curvalid = value;
-			break;
-		case HID_DG_CONTACTID:
-			td->curdata.contactid = value;
-			break;
-		case HID_DG_TIPPRESSURE:
-			td->curdata.p = value;
-			break;
-		case HID_GD_X:
-			if (usage->code == ABS_MT_TOOL_X)
-				td->curdata.cx = value;
-			else
-				td->curdata.x = value;
-			break;
-		case HID_GD_Y:
-			if (usage->code == ABS_MT_TOOL_Y)
-				td->curdata.cy = value;
-			else
-				td->curdata.y = value;
-			break;
-		case HID_DG_WIDTH:
-			td->curdata.w = value;
-			break;
-		case HID_DG_HEIGHT:
-			td->curdata.h = value;
-			break;
-		case HID_DG_SCANTIME:
-			td->timestamp = mt_compute_timestamp(td, 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;
+
+	if (app->application == HID_GD_SYSTEM_MULTIAXIS)
+		tool = MT_TOOL_DIAL;
+	else if (unlikely(!confidence_state)) {
+		tool = MT_TOOL_PALM;
+		if (!active &&
+		    input_mt_is_active(&mt->slots[slotnum])) {
+			/*
+			 * The non-confidence was reported for
+			 * previously valid contact that is also no
+			 * longer valid. We can't simply report
+			 * lift-off as userspace will not be aware
+			 * of non-confidence, so we need to split
+			 * it into 2 events: active MT_TOOL_PALM
+			 * and a separate liftoff.
+			 */
+			active = true;
+			set_bit(slotnum, app->pending_palm_slots);
+		}
+	}
+
+	input_mt_slot(input, slotnum);
+	input_mt_report_slot_state(input, tool, 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
···
 			 * out of range to [-MAX/2, MAX/2] to report an upside
 			 * down ellipsis.
 			 */
-			if (value > field->logical_maximum / 2)
-				value -= field->logical_maximum;
-			td->curdata.a = -value;
-			td->curdata.has_azimuth = true;
-			break;
-		case HID_DG_TOUCH:
-			/* do nothing */
-			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 ((quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
-			    !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 ((quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
-			    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);
-			return;
+			azimuth = *slot->a;
+			max_azimuth = input_abs_get_max(input,
+							ABS_MT_ORIENTATION);
+			if (azimuth > max_azimuth * 2)
+				azimuth -= max_azimuth * 4;
+			orientation = -azimuth;
 		}
 
-		if (usage->usage_index + 1 == field->report_count) {
-			/* we only take into account the last report. */
-			if (usage->hid == td->last_slot_field)
-				mt_complete_slot(td, field->hidinput->input);
+		if (quirks & MT_QUIRK_TOUCH_SIZE_SCALING) {
+			/*
+			 * divided by two to match visual scale of touch
+			 * for devices with this quirk
+			 */
+			major = major >> 1;
+			minor = minor >> 1;
 		}
 
+		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);
 	}
+
+	return 0;
 }
 
-static void mt_touch_report(struct hid_device *hid, struct hid_report *report)
+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;
+
+		/*
+		 * 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,
+			    struct mt_report_data *rdata)
 {
 	struct mt_device *td = hid_get_drvdata(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, scantime = 0;
+	int r, n;
+	int scantime = 0;
+	int contact_count = -1;
 
 	/* sticky fingers release in progress, abort */
 	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 (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 (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.
···
 		 * of a possible multi-packet frame be checking that the
 		 * timestamp has changed.
 		 */
-		if ((td->mtclass.quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
-		    td->num_received == 0 && td->prev_scantime != scantime)
-			td->num_expected = value;
+		if ((app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
+		    app->num_received == 0 &&
+		    app->prev_scantime != scantime)
+			app->num_expected = contact_count;
 		/* A non 0 contact count always indicates a first packet */
-		else if (value)
-			td->num_expected = value;
+		else if (contact_count)
+			app->num_expected = contact_count;
 	}
-	td->prev_scantime = scantime;
+	app->prev_scantime = scantime;
 
-	first_packet = td->num_received == 0;
+	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;
···
 			continue;
 
 		for (n = 0; n < count; n++)
-			mt_process_mt_event(hid, field, &field->usage[n],
-					    field->value[n], first_packet);
+			mt_process_mt_event(hid, app, field,
+					    &field->usage[n], field->value[n],
+					    first_packet);
 	}
 
-	if (td->num_received >= td->num_expected)
-		mt_sync_frame(td, report->field[0]->hidinput->input);
+	if (app->num_received >= app->num_expected)
+		mt_sync_frame(td, app, input);
 
 	/*
 	 * Windows 8 specs says 2 things:
···
 	 * only affect laggish machines and the ones that have a firmware
 	 * defect.
 	 */
-	if (td->mtclass.quirks & MT_QUIRK_STICKY_FINGERS) {
+	if (app->quirks & MT_QUIRK_STICKY_FINGERS) {
 		if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
 			mod_timer(&td->release_timer,
 				  jiffies + msecs_to_jiffies(100));
···
 }
 
 static int mt_touch_input_configured(struct hid_device *hdev,
-					struct hid_input *hi)
+				     struct hid_input *hi,
+				     struct mt_application *app)
 {
 	struct mt_device *td = hid_get_drvdata(hdev);
 	struct mt_class *cls = &td->mtclass;
···
 	if (!td->maxcontacts)
 		td->maxcontacts = MT_DEFAULT_MAXCONTACT;
 
-	mt_post_parse(td);
+	mt_post_parse(td, app);
 	if (td->serial_maybe)
-		mt_post_parse_default_settings(td);
+		mt_post_parse_default_settings(td, app);
 
 	if (cls->is_indirect)
-		td->mt_flags |= INPUT_MT_POINTER;
+		app->mt_flags |= INPUT_MT_POINTER;
 
-	if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
-		td->mt_flags |= INPUT_MT_DROP_UNUSED;
+	if (app->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
+		app->mt_flags |= INPUT_MT_DROP_UNUSED;
 
 	/* check for clickpads */
-	if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
+	if ((app->mt_flags & INPUT_MT_POINTER) &&
+	    (app->buttons_count == 1))
 		td->is_buttonpad = true;
 
 	if (td->is_buttonpad)
 		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
 
-	ret = input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
+	app->pending_palm_slots = devm_kcalloc(&hi->input->dev,
+					       BITS_TO_LONGS(td->maxcontacts),
+					       sizeof(long),
+					       GFP_KERNEL);
+	if (!app->pending_palm_slots)
+		return -ENOMEM;
+
+	ret = input_mt_init_slots(input, td->maxcontacts, app->mt_flags);
 	if (ret)
 		return ret;
 
-	td->mt_flags = 0;
+	app->mt_flags = 0;
 	return 0;
 }
 
···
 		unsigned long **bit, int *max)
 {
 	struct mt_device *td = hid_get_drvdata(hdev);
+	struct mt_application *application;
+	struct mt_report_data *rdata;
+
+	rdata = mt_find_report_data(td, field->report);
+	if (!rdata) {
+		hid_err(hdev, "failed to allocate data for report\n");
+		return 0;
+	}
+
+	application = rdata->application;
 
 	/*
 	 * If mtclass.export_all_inputs is not set, only map fields from
···
 	    field->application != HID_GD_SYSTEM_CONTROL &&
 	    field->application != HID_CP_CONSUMER_CONTROL &&
 	    field->application != HID_GD_WIRELESS_RADIO_CTLS &&
+	    field->application != HID_GD_SYSTEM_MULTIAXIS &&
 	    !(field->application == HID_VD_ASUS_CUSTOM_MEDIA_KEYS &&
-	      td->mtclass.quirks & MT_QUIRK_ASUS_CUSTOM_UP))
+	      application->quirks & MT_QUIRK_ASUS_CUSTOM_UP))
 		return -1;
 
 	/*
···
 	 * map usages to input keys.
 	 */
 	if (field->application == HID_VD_ASUS_CUSTOM_MEDIA_KEYS &&
-	    td->mtclass.quirks & MT_QUIRK_ASUS_CUSTOM_UP &&
+	    application->quirks & MT_QUIRK_ASUS_CUSTOM_UP &&
 	    (usage->hid & HID_USAGE_PAGE) == HID_UP_CUSTOM) {
 		set_bit(EV_REP, hi->input->evbit);
 		if (field->flags & HID_MAIN_ITEM_VARIABLE)
···
 		return 1;
 	}
 
-	/*
-	 * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
-	 * for the stylus.
-	 * The check for mt_report_id ensures we don't process
-	 * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
-	 * collection, but within the report ID.
-	 */
-	if (field->physical == HID_DG_STYLUS)
-		return 0;
-	else if ((field->physical == 0) &&
-		 (field->report->id != td->mt_report_id) &&
-		 (td->mt_report_id != -1))
-		return 0;
-
-	if (field->application == HID_DG_TOUCHSCREEN ||
-	    field->application == HID_DG_TOUCHPAD)
-		return mt_touch_input_mapping(hdev, hi, field, usage, bit, max);
+	if (rdata->is_mt_collection)
+		return mt_touch_input_mapping(hdev, hi, field, usage, bit, max,
+					      application);
 
 	/* let hid-core decide for the others */
 	return 0;
···
 		struct hid_field *field, struct hid_usage *usage,
 		unsigned long **bit, int *max)
 {
-	/*
-	 * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
-	 * for the stylus.
-	 */
-	if (field->physical == HID_DG_STYLUS)
-		return 0;
+	struct mt_device *td = hid_get_drvdata(hdev);
+	struct mt_report_data *rdata;
 
-	if (field->application == HID_DG_TOUCHSCREEN ||
-	    field->application == HID_DG_TOUCHPAD) {
+	rdata = mt_find_report_data(td, field->report);
+	if (rdata && rdata->is_mt_collection) {
 		/* We own these mappings, tell hid-input to ignore them */
 		return -1;
 	}
···
 				struct hid_usage *usage, __s32 value)
 {
 	struct mt_device *td = hid_get_drvdata(hid);
+	struct mt_report_data *rdata;
 
-	if (field->report->id == td->mt_report_id)
+	rdata = mt_find_report_data(td, field->report);
+	if (rdata && rdata->is_mt_collection)
 		return mt_touch_event(hid, field, usage, value);
 
 	return 0;
···
 {
 	struct mt_device *td = hid_get_drvdata(hid);
 	struct hid_field *field = report->field[0];
+	struct mt_report_data *rdata;
 
 	if (!(hid->claimed & HID_CLAIMED_INPUT))
 		return;
 
-	if (report->id == td->mt_report_id)
-		return mt_touch_report(hid, report);
+	rdata = mt_find_report_data(td, report);
+	if (rdata && rdata->is_mt_collection)
+		return mt_touch_report(hid, rdata);
 
 	if (field && field->hidinput && field->hidinput->input)
 		input_sync(field->hidinput->input);
···
 		return true;
 
 	case HID_DG_CONTACTMAX:
-		if (td->mtclass.maxcontacts) {
+		if (cls->maxcontacts) {
 			max = min_t(int, field->logical_maximum,
-				    td->mtclass.maxcontacts);
+				    cls->maxcontacts);
 			if (field->value[index] != max) {
 				field->value[index] = max;
 				return true;
···
 	}
 }
 
-static void mt_post_parse_default_settings(struct mt_device *td)
+static void mt_post_parse_default_settings(struct mt_device *td,
+					   struct mt_application *app)
 {
-	__s32 quirks = td->mtclass.quirks;
+	__s32 quirks = app->quirks;
 
 	/* unknown serial device needs special quirks */
-	if (td->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;
···
 		quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
 	}
 
-	td->mtclass.quirks = quirks;
+	app->quirks = quirks;
 }
 
-static void mt_post_parse(struct mt_device *td)
+static void mt_post_parse(struct mt_device *td, struct mt_application *app)
 {
-	struct mt_fields *f = td->fields;
-	struct mt_class *cls = &td->mtclass;
-
-	if (td->touches_by_report > 0) {
-		int field_count_per_touch = f->length / td->touches_by_report;
-		td->last_slot_field = f->usages[field_count_per_touch - 1];
-	}
-
-	if (td->cc_index < 0)
-		cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
+	if (!app->have_contact_count)
+		app->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
 }
 
 static int mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
···
 	char *name;
 	const char *suffix = NULL;
 	unsigned int application = 0;
+	struct mt_report_data *rdata;
+	struct mt_application *mt_application = NULL;
 	struct hid_report *report;
 	int ret;
 
 	list_for_each_entry(report, &hi->reports, hidinput_list) {
 		application = report->application;
-		if (report->id == td->mt_report_id) {
-			ret = mt_touch_input_configured(hdev, hi);
+		rdata = mt_find_report_data(td, report);
+		if (!rdata) {
+			hid_err(hdev, "failed to allocate data for report\n");
+			return -ENOMEM;
+		}
+
+		mt_application = rdata->application;
+
+		if (rdata->is_mt_collection) {
+			ret = mt_touch_input_configured(hdev, hi,
+							mt_application);
 			if (ret)
 				return ret;
 		}
···
 		case HID_GD_SYSTEM_CONTROL:
 		case HID_CP_CONSUMER_CONTROL:
 		case HID_GD_WIRELESS_RADIO_CTLS:
+		case HID_GD_SYSTEM_MULTIAXIS:
 			/* already handled by hid core */
 			break;
 		case HID_DG_TOUCHSCREEN:
···
 static void mt_release_contacts(struct hid_device *hid)
 {
 	struct hid_input *hidinput;
+	struct mt_application *application;
 	struct mt_device *td = hid_get_drvdata(hid);
 
 	list_for_each_entry(hidinput, &hid->inputs, list) {
···
 		}
 	}
 
-	td->num_received = 0;
+	list_for_each_entry(application, &td->applications, list) {
+		application->num_received = 0;
+	}
 }
 
 static void mt_expired_timeout(struct timer_list *t)
···
 {
 	int ret, i;
 	struct mt_device *td;
-	struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
+	const struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
 
 	for (i = 0; mt_classes[i].name ; i++) {
 		if (id->driver_data == mt_classes[i].name) {
···
 	td->hdev = hdev;
 	td->mtclass = *mtclass;
 	td->inputmode_value = MT_INPUTMODE_TOUCHSCREEN;
-	td->cc_index = -1;
-	td->scantime_index = -1;
-	td->mt_report_id = -1;
 	hid_set_drvdata(hdev, td);
 
-	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;
-	}
+	INIT_LIST_HEAD(&td->applications);
+	INIT_LIST_HEAD(&td->reports);
 
 	if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
 		td->serial_maybe = true;
···
 				hdev->name);
 
 	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;
 }

include/linux/hid.h

···
  * http://www.usb.org/developers/hidpage/HUTRR40RadioHIDUsagesFinal.pdf
  */
 #define HID_GD_WIRELESS_RADIO_CTLS	0x0001000c
+/*
+ * System Multi-Axis, see:
+ * http://www.usb.org/developers/hidpage/HUTRR62_-_Generic_Desktop_CA_for_System_Multi-Axis_Controllers.txt
+ */
+#define HID_GD_SYSTEM_MULTIAXIS	0x0001000e
+
 #define HID_GD_X		0x00010030
 #define HID_GD_Y		0x00010031
 #define HID_GD_Z		0x00010032
···
 struct hid_parser {
 	struct hid_global     global;
 	struct hid_global     global_stack[HID_GLOBAL_STACK_SIZE];
-	unsigned              global_stack_ptr;
+	unsigned int          global_stack_ptr;
 	struct hid_local      local;
-	unsigned              collection_stack[HID_COLLECTION_STACK_SIZE];
-	unsigned              collection_stack_ptr;
+	unsigned int         *collection_stack;
+	unsigned int          collection_stack_ptr;
+	unsigned int          collection_stack_size;
 	struct hid_device    *device;
-	unsigned              scan_flags;
+	unsigned int          scan_flags;
 };
 
 struct hid_class_descriptor {

include/uapi/linux/input.h

···
 /*
  * MT_TOOL types
  */
-#define MT_TOOL_FINGER		0
-#define MT_TOOL_PEN		1
-#define MT_TOOL_PALM		2
-#define MT_TOOL_MAX		2
+#define MT_TOOL_FINGER		0x00
+#define MT_TOOL_PEN		0x01
+#define MT_TOOL_PALM		0x02
+#define MT_TOOL_DIAL		0x0a
+#define MT_TOOL_MAX		0x0f
 
 /*
  * Values describing the status of a force-feedback effect