Merge branch 'for-4.18/multitouch' into for-linus

- improvement of duplicate usage handling in hid-input from Benjamin Tissoires
- Win 8.1 precisioun touchpad spec implementation from Benjamin Tissoires

Author: Jiri Kosina

drivers/hid/hid-core.c

@@ -57,7 +57,9 @@ MODULE_PARM_DESC(ignore_special_drivers, "Ignore any special drivers and handle
  * Register a new report for a device.
  */
 
-struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id)
+struct hid_report *hid_register_report(struct hid_device *device,
+				       unsigned int type, unsigned int id,
+				       unsigned int application)
 {
 	struct hid_report_enum *report_enum = device->report_enum + type;
 	struct hid_report *report;
@@ -78,6 +80,7 @@ struct hid_report *hid_register_report(struct hid_device *device, unsigned type,
 	report->type = type;
 	report->size = 0;
 	report->device = device;
+	report->application = application;
 	report_enum->report_id_hash[id] = report;
 
 	list_add_tail(&report->list, &report_enum->report_list);
@@ -221,11 +224,15 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign
 {
 	struct hid_report *report;
 	struct hid_field *field;
-	unsigned usages;
-	unsigned offset;
-	unsigned i;
+	unsigned int usages;
+	unsigned int offset;
+	unsigned int i;
+	unsigned int application;
+
+	application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);
 
-	report = hid_register_report(parser->device, report_type, parser->global.report_id);
+	report = hid_register_report(parser->device, report_type,
+				     parser->global.report_id, application);
 	if (!report) {
 		hid_err(parser->device, "hid_register_report failed\n");
 		return -1;
@@ -259,7 +266,7 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign
 
 	field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL);
 	field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL);
-	field->application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);
+	field->application = application;
 
 	for (i = 0; i < usages; i++) {
 		unsigned j = i;

drivers/hid/hid-generic.c

@@ -56,6 +56,20 @@ static bool hid_generic_match(struct hid_device *hdev,
 	return true;
 }
 
+static int hid_generic_probe(struct hid_device *hdev,
+			     const struct hid_device_id *id)
+{
+	int ret;
+
+	hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
+
+	ret = hid_parse(hdev);
+	if (ret)
+		return ret;
+
+	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+}
+
 static const struct hid_device_id hid_table[] = {
 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY, HID_ANY_ID, HID_ANY_ID) },
 	{ }
@@ -66,6 +80,7 @@ static struct hid_driver hid_generic = {
 	.name = "hid-generic",
 	.id_table = hid_table,
 	.match = hid_generic_match,
+	.probe = hid_generic_probe,
 };
 module_hid_driver(hid_generic);
 

drivers/hid/hid-gfrm.c

@@ -116,7 +116,7 @@ static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		 * those reports reach gfrm_raw_event() from hid_input_report().
 		 */
 		if (!hid_register_report(hdev, HID_INPUT_REPORT,
-					 GFRM100_SEARCH_KEY_REPORT_ID)) {
+					 GFRM100_SEARCH_KEY_REPORT_ID, 0)) {
 			ret = -ENOMEM;
 			goto done;
 		}

drivers/hid/hid-input.c

@@ -1110,8 +1110,31 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 
 	set_bit(usage->type, input->evbit);
 
-	while (usage->code <= max && test_and_set_bit(usage->code, bit))
-		usage->code = find_next_zero_bit(bit, max + 1, usage->code);
+	/*
+	 * This part is *really* controversial:
+	 * - HID aims at being generic so we should do our best to export
+	 *   all incoming events
+	 * - HID describes what events are, so there is no reason for ABS_X
+	 *   to be mapped to ABS_Y
+	 * - HID is using *_MISC+N as a default value, but nothing prevents
+	 *   *_MISC+N to overwrite a legitimate even, which confuses userspace
+	 *   (for instance ABS_MISC + 7 is ABS_MT_SLOT, which has a different
+	 *   processing)
+	 *
+	 * If devices still want to use this (at their own risk), they will
+	 * have to use the quirk HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE, but
+	 * the default should be a reliable mapping.
+	 */
+	while (usage->code <= max && test_and_set_bit(usage->code, bit)) {
+		if (device->quirks & HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE) {
+			usage->code = find_next_zero_bit(bit,
+							 max + 1,
+							 usage->code);
+		} else {
+			device->status |= HID_STAT_DUP_DETECTED;
+			goto ignore;
+		}
+	}
 
 	if (usage->code > max)
 		goto ignore;
@@ -1487,15 +1510,56 @@ static void report_features(struct hid_device *hid)
 		}
 }
 
-static struct hid_input *hidinput_allocate(struct hid_device *hid)
+static struct hid_input *hidinput_allocate(struct hid_device *hid,
+					   unsigned int application)
 {
 	struct hid_input *hidinput = kzalloc(sizeof(*hidinput), GFP_KERNEL);
 	struct input_dev *input_dev = input_allocate_device();
-	if (!hidinput || !input_dev) {
-		kfree(hidinput);
-		input_free_device(input_dev);
-		hid_err(hid, "Out of memory during hid input probe\n");
-		return NULL;
+	const char *suffix = NULL;
+
+	if (!hidinput || !input_dev)
+		goto fail;
+
+	if ((hid->quirks & HID_QUIRK_INPUT_PER_APP) &&
+	    hid->maxapplication > 1) {
+		switch (application) {
+		case HID_GD_KEYBOARD:
+			suffix = "Keyboard";
+			break;
+		case HID_GD_KEYPAD:
+			suffix = "Keypad";
+			break;
+		case HID_GD_MOUSE:
+			suffix = "Mouse";
+			break;
+		case HID_DG_STYLUS:
+			suffix = "Pen";
+			break;
+		case HID_DG_TOUCHSCREEN:
+			suffix = "Touchscreen";
+			break;
+		case HID_DG_TOUCHPAD:
+			suffix = "Touchpad";
+			break;
+		case HID_GD_SYSTEM_CONTROL:
+			suffix = "System Control";
+			break;
+		case HID_CP_CONSUMER_CONTROL:
+			suffix = "Consumer Control";
+			break;
+		case HID_GD_WIRELESS_RADIO_CTLS:
+			suffix = "Wireless Radio Control";
+			break;
+		default:
+			break;
+		}
+	}
+
+	if (suffix) {
+		hidinput->name = kasprintf(GFP_KERNEL, "%s %s",
+					   hid->name, suffix);
+		if (!hidinput->name)
+			goto fail;
 	}
 
 	input_set_drvdata(input_dev, hid);
@@ -1505,18 +1569,27 @@ static struct hid_input *hidinput_allocate(struct hid_device *hid)
 	input_dev->setkeycode = hidinput_setkeycode;
 	input_dev->getkeycode = hidinput_getkeycode;
 
-	input_dev->name = hid->name;
+	input_dev->name = hidinput->name ? hidinput->name : hid->name;
 	input_dev->phys = hid->phys;
 	input_dev->uniq = hid->uniq;
 	input_dev->id.bustype = hid->bus;
 	input_dev->id.vendor  = hid->vendor;
 	input_dev->id.product = hid->product;
 	input_dev->id.version = hid->version;
 	input_dev->dev.parent = &hid->dev;
+
 	hidinput->input = input_dev;
 	list_add_tail(&hidinput->list, &hid->inputs);
 
+	INIT_LIST_HEAD(&hidinput->reports);
+
 	return hidinput;
+
+fail:
+	kfree(hidinput);
+	input_free_device(input_dev);
+	hid_err(hid, "Out of memory during hid input probe\n");
+	return NULL;
 }
 
 static bool hidinput_has_been_populated(struct hid_input *hidinput)
@@ -1562,6 +1635,7 @@ static void hidinput_cleanup_hidinput(struct hid_device *hid,
 
 	list_del(&hidinput->list);
 	input_free_device(hidinput->input);
+	kfree(hidinput->name);
 
 	for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
 		if (k == HID_OUTPUT_REPORT &&
@@ -1594,6 +1668,20 @@ static struct hid_input *hidinput_match(struct hid_report *report)
 	return NULL;
 }
 
+static struct hid_input *hidinput_match_application(struct hid_report *report)
+{
+	struct hid_device *hid = report->device;
+	struct hid_input *hidinput;
+
+	list_for_each_entry(hidinput, &hid->inputs, list) {
+		if (hidinput->report &&
+		    hidinput->report->application == report->application)
+			return hidinput;
+	}
+
+	return NULL;
+}
+
 static inline void hidinput_configure_usages(struct hid_input *hidinput,
 					     struct hid_report *report)
 {
@@ -1616,11 +1704,14 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
 	struct hid_driver *drv = hid->driver;
 	struct hid_report *report;
 	struct hid_input *next, *hidinput = NULL;
+	unsigned int application;
 	int i, k;
 
 	INIT_LIST_HEAD(&hid->inputs);
 	INIT_WORK(&hid->led_work, hidinput_led_worker);
 
+	hid->status &= ~HID_STAT_DUP_DETECTED;
+
 	if (!force) {
 		for (i = 0; i < hid->maxcollection; i++) {
 			struct hid_collection *col = &hid->collection[i];
@@ -1646,15 +1737,20 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
 			if (!report->maxfield)
 				continue;
 
+			application = report->application;
+
 			/*
 			 * Find the previous hidinput report attached
 			 * to this report id.
 			 */
 			if (hid->quirks & HID_QUIRK_MULTI_INPUT)
 				hidinput = hidinput_match(report);
+			else if (hid->maxapplication > 1 &&
+				 (hid->quirks & HID_QUIRK_INPUT_PER_APP))
+				hidinput = hidinput_match_application(report);
 
 			if (!hidinput) {
-				hidinput = hidinput_allocate(hid);
+				hidinput = hidinput_allocate(hid, application);
 				if (!hidinput)
 					goto out_unwind;
 			}
@@ -1663,6 +1759,9 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
 
 			if (hid->quirks & HID_QUIRK_MULTI_INPUT)
 				hidinput->report = report;
+
+			list_add_tail(&report->hidinput_list,
+				      &hidinput->reports);
 		}
 	}
 
@@ -1687,6 +1786,10 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
 		goto out_unwind;
 	}
 
+	if (hid->status & HID_STAT_DUP_DETECTED)
+		hid_dbg(hid,
+			"Some usages could not be mapped, please use HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE if this is legitimate.\n");
+
 	return 0;
 
 out_unwind:

drivers/hid/hid-magicmouse.c

@@ -531,12 +531,12 @@ static int magicmouse_probe(struct hid_device *hdev,
 
 	if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE)
 		report = hid_register_report(hdev, HID_INPUT_REPORT,
-			MOUSE_REPORT_ID);
+			MOUSE_REPORT_ID, 0);
 	else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
 		report = hid_register_report(hdev, HID_INPUT_REPORT,
-			TRACKPAD_REPORT_ID);
+			TRACKPAD_REPORT_ID, 0);
 		report = hid_register_report(hdev, HID_INPUT_REPORT,
-			DOUBLE_REPORT_ID);
+			DOUBLE_REPORT_ID, 0);
 	}
 
 	if (!report) {