1 files changed, 60 insertions, 73 deletions

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index cb0e361d7a4..5e5fe1b8eeb 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -101,9 +101,9 @@ struct mt_device {
 	unsigned last_slot_field;	/* the last field of a slot */
 	unsigned mt_report_id;	/* the report ID of the multitouch device */
 	unsigned pen_report_id;	/* the report ID of the pen device */
-	__s8 inputmode;		/* InputMode HID feature, -1 if non-existent */
-	__s8 inputmode_index;	/* InputMode HID feature index in the report */
-	__s8 maxcontact_report_id;	/* Maximum Contact Number HID feature,
+	__s16 inputmode;	/* InputMode HID feature, -1 if non-existent */
+	__s16 inputmode_index;	/* InputMode HID feature index in the report */
+	__s16 maxcontact_report_id;	/* Maximum Contact Number HID feature,
 				   -1 if non-existent */
 	__u8 num_received;	/* how many contacts we received */
 	__u8 num_expected;	/* expected last contact index */
@@ -133,6 +133,7 @@ static void mt_post_parse(struct mt_device *td);
 #define MT_CLS_NSMU				0x000a
 #define MT_CLS_DUAL_CONTACT_NUMBER		0x0010
 #define MT_CLS_DUAL_CONTACT_ID			0x0011
+#define MT_CLS_WIN_8				0x0012
 
 /* vendor specific classes */
 #define MT_CLS_3M				0x0101
@@ -205,6 +206,11 @@ static struct mt_class mt_classes[] = {
 			MT_QUIRK_CONTACT_CNT_ACCURATE |
 			MT_QUIRK_SLOT_IS_CONTACTID,
 		.maxcontacts = 2 },
+	{ .name = MT_CLS_WIN_8,
+		.quirks = MT_QUIRK_ALWAYS_VALID |
+			MT_QUIRK_IGNORE_DUPLICATES |
+			MT_QUIRK_HOVERING |
+			MT_QUIRK_CONTACT_CNT_ACCURATE },
 
 	/*
 	 * vendor specific classes
@@ -261,17 +267,6 @@ static struct mt_class mt_classes[] = {
 	{ }
 };
 
-static void mt_free_input_name(struct hid_input *hi)
-{
-	struct hid_device *hdev = hi->report->device;
-	const char *name = hi->input->name;
-
-	if (name != hdev->name) {
-		hi->input->name = hdev->name;
-		kfree(name);
-	}
-}
-
 static ssize_t mt_show_quirks(struct device *dev,
 			   struct device_attribute *attr,
 			   char *buf)
@@ -317,20 +312,18 @@ static void mt_feature_mapping(struct hid_device *hdev,
 		struct hid_field *field, struct hid_usage *usage)
 {
 	struct mt_device *td = hid_get_drvdata(hdev);
-	int i;
 
 	switch (usage->hid) {
 	case HID_DG_INPUTMODE:
-		td->inputmode = field->report->id;
-		td->inputmode_index = 0; /* has to be updated below */
-
-		for (i=0; i < field->maxusage; i++) {
-			if (field->usage[i].hid == usage->hid) {
-				td->inputmode_index = i;
-				break;
-			}
+		/* Ignore if value index is out of bounds. */
+		if (usage->usage_index >= field->report_count) {
+			dev_err(&hdev->dev, "HID_DG_INPUTMODE out of range\n");
+			break;
 		}
 
+		td->inputmode = field->report->id;
+		td->inputmode_index = usage->usage_index;
+
 		break;
 	case HID_DG_CONTACTMAX:
 		td->maxcontact_report_id = field->report->id;
@@ -343,19 +336,6 @@ static void mt_feature_mapping(struct hid_device *hdev,
 			td->maxcontacts = td->mtclass.maxcontacts;
 
 		break;
-	case 0xff0000c5:
-		if (field->report_count == 256 && field->report_size == 8) {
-			/* Win 8 devices need special quirks */
-			__s32 *quirks = &td->mtclass.quirks;
-			*quirks |= MT_QUIRK_ALWAYS_VALID;
-			*quirks |= MT_QUIRK_IGNORE_DUPLICATES;
-			*quirks |= MT_QUIRK_HOVERING;
-			*quirks |= MT_QUIRK_CONTACT_CNT_ACCURATE;
-			*quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP;
-			*quirks &= ~MT_QUIRK_VALID_IS_INRANGE;
-			*quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE;
-		}
-		break;
 	}
 }
 
@@ -415,13 +395,6 @@ static void mt_pen_report(struct hid_device *hid, struct hid_report *report)
 static void mt_pen_input_configured(struct hid_device *hdev,
 					struct hid_input *hi)
 {
-	char *name = kzalloc(strlen(hi->input->name) + 5, GFP_KERNEL);
-	if (name) {
-		sprintf(name, "%s Pen", hi->input->name);
-		mt_free_input_name(hi);
-		hi->input->name = name;
-	}
-
 	/* force BTN_STYLUS to allow tablet matching in udev */
 	__set_bit(BTN_STYLUS, hi->input->keybit);
 }
@@ -536,6 +509,10 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 			mt_store_field(usage, td, hi);
 			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;
 			return 1;
@@ -928,16 +905,26 @@ 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);
-	char *name = kstrdup(hdev->name, GFP_KERNEL);
-
-	if (name)
-		hi->input->name = name;
+	char *name;
+	const char *suffix = NULL;
 
 	if (hi->report->id == td->mt_report_id)
 		mt_touch_input_configured(hdev, hi);
 
-	if (hi->report->id == td->pen_report_id)
+	if (hi->report->field[0]->physical == HID_DG_STYLUS) {
+		suffix = "Pen";
 		mt_pen_input_configured(hdev, hi);
+	}
+
+	if (suffix) {
+		name = devm_kzalloc(&hi->input->dev,
+				    strlen(hdev->name) + strlen(suffix) + 2,
+				    GFP_KERNEL);
+		if (name) {
+			sprintf(name, "%s %s", hdev->name, suffix);
+			hi->input->name = name;
+		}
+	}
 }
 
 static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
@@ -945,7 +932,6 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	int ret, i;
 	struct mt_device *td;
 	struct mt_class *mtclass = mt_classes; /* MT_CLS_DEFAULT */
-	struct hid_input *hi;
 
 	for (i = 0; mt_classes[i].name ; i++) {
 		if (id->driver_data == mt_classes[i].name) {
@@ -967,7 +953,19 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	hdev->quirks |= HID_QUIRK_MULTI_INPUT;
 	hdev->quirks |= HID_QUIRK_NO_EMPTY_INPUT;
 
-	td = kzalloc(sizeof(struct mt_device), GFP_KERNEL);
+	/*
+	 * Handle special quirks for Windows 8 certified devices.
+	 */
+	if (id->group == HID_GROUP_MULTITOUCH_WIN_8)
+		/*
+		 * Some multitouch screens do not like to be polled for input
+		 * reports. Fortunately, the Win8 spec says that all touches
+		 * should be sent during each report, making the initialization
+		 * of input reports unnecessary.
+		 */
+		hdev->quirks |= HID_QUIRK_NO_INIT_INPUT_REPORTS;
+
+	td = devm_kzalloc(&hdev->dev, sizeof(struct mt_device), GFP_KERNEL);
 	if (!td) {
 		dev_err(&hdev->dev, "cannot allocate multitouch data\n");
 		return -ENOMEM;
@@ -980,11 +978,11 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	td->pen_report_id = -1;
 	hid_set_drvdata(hdev, td);
 
-	td->fields = kzalloc(sizeof(struct mt_fields), GFP_KERNEL);
+	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");
-		ret = -ENOMEM;
-		goto fail;
+		return -ENOMEM;
 	}
 
 	if (id->vendor == HID_ANY_ID && id->product == HID_ANY_ID)
@@ -992,29 +990,22 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 	ret = hid_parse(hdev);
 	if (ret != 0)
-		goto fail;
+		return ret;
 
 	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 	if (ret)
-		goto hid_fail;
+		return ret;
 
 	ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
 
 	mt_set_maxcontacts(hdev);
 	mt_set_input_mode(hdev);
 
-	kfree(td->fields);
+	/* release .fields memory as it is not used anymore */
+	devm_kfree(&hdev->dev, td->fields);
 	td->fields = NULL;
 
 	return 0;
-
-hid_fail:
-	list_for_each_entry(hi, &hdev->inputs, list)
-		mt_free_input_name(hi);
-fail:
-	kfree(td->fields);
-	kfree(td);
-	return ret;
 }
 
 #ifdef CONFIG_PM
@@ -1039,17 +1030,8 @@ static int mt_resume(struct hid_device *hdev)
 
 static void mt_remove(struct hid_device *hdev)
 {
-	struct mt_device *td = hid_get_drvdata(hdev);
-	struct hid_input *hi;
-
 	sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);
-	list_for_each_entry(hi, &hdev->inputs, list)
-		mt_free_input_name(hi);
-
 	hid_hw_stop(hdev);
-
-	kfree(td);
-	hid_set_drvdata(hdev, NULL);
 }
 
 static const struct hid_device_id mt_devices[] = {
@@ -1371,6 +1353,11 @@ static const struct hid_device_id mt_devices[] = {
 
 	/* Generic MT device */
 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH, HID_ANY_ID, HID_ANY_ID) },
+
+	/* Generic Win 8 certified MT device */
+	{  .driver_data = MT_CLS_WIN_8,
+		HID_DEVICE(HID_BUS_ANY, HID_GROUP_MULTITOUCH_WIN_8,
+			HID_ANY_ID, HID_ANY_ID) },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, mt_devices);