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

@@ -310,12 +310,12 @@ ABS_MT_TOOL_Y
 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

@@ -128,9 +128,19 @@ static int open_collection(struct hid_parser *parser, unsigned type)
 
 	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) {
@@ -840,6 +850,7 @@ static int hid_scan_report(struct hid_device *hid)
 		break;
 	}
 
+	kfree(parser->collection_stack);
 	vfree(parser);
 	return 0;
 }

drivers/hid/hid-input.c

@@ -1550,6 +1550,9 @@ static struct hid_input *hidinput_allocate(struct hid_device *hid,
 		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

@@ -22,12 +22,13 @@
 
 #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)
@@ -130,6 +131,30 @@ static int ms_presenter_8k_quirk(struct hid_input *hi, struct hid_usage *usage,
 	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)
@@ -146,6 +171,13 @@ static int ms_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 			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;
 }
 
@@ -229,6 +261,9 @@ static int ms_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	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");
@@ -281,6 +316,8 @@ static const struct hid_device_id ms_devices[] = {
 
 	{ 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);

include/linux/hid.h

@@ -190,6 +190,12 @@ struct hid_item {
  * 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
@@ -638,12 +644,13 @@ static inline void hid_set_drvdata(struct hid_device *hdev, void *data)
 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

@@ -270,10 +270,11 @@ struct input_mask {
 /*
  * 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