[WIP] xpadneo, mouse: Implement mouse support

Co-authored-by: Jacob Essex <git@jacobessex.com>
Co-authored-by: Florian Dollinger <dollinger.florian@gmx.de>
Closes: #160
Closes: #105
Closes: #99
Signed-off-by: Kai Krakow <kai@kaishome.de>

Author: 3 people

hid-xpadneo/src/hid-xpadneo.c

@@ -749,7 +749,10 @@ static u8 *xpadneo_report_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int
 
 static void xpadneo_toggle_mouse(struct xpadneo_devdata *xdata)
 {
-	if (xdata->mouse_mode) {
+	if (!xdata->mouse) {
+		xdata->mouse_mode = false;
+		hid_info(xdata->hdev, "mouse not available\n");
+	} else if (xdata->mouse_mode) {
 		xdata->mouse_mode = false;
 		hid_info(xdata->hdev, "mouse mode disabled\n");
 	} else {
@@ -889,6 +892,7 @@ static int xpadneo_input_configured(struct hid_device *hdev, struct hid_input *h
 		return 0;
 	default:
 		hid_warn(hdev, "unhandled input application 0x%x\n", hi->application);
+		return 0;
 	}
 
 	/*
@@ -970,14 +974,37 @@ static int xpadneo_input_configured(struct hid_device *hdev, struct hid_input *h
 	return 0;
 }
 
+static void xpadneo_mouse_event(struct timer_list *t)
+{
+	struct xpadneo_devdata *xdata = from_timer(xdata, t, mouse_timer);
+	struct input_dev *mouse = xdata->mouse;
+
+	if (xdata->mouse_mode) {
+		input_report_rel(mouse, REL_X, xdata->mouse_state.rel_x / 2000);
+		input_report_rel(mouse, REL_Y, xdata->mouse_state.rel_y / 2000);
+		input_sync(xdata->mouse);
+	}
+
+	mod_timer(&xdata->mouse_timer, jiffies + msecs_to_jiffies(10));
+}
+
 static int xpadneo_event(struct hid_device *hdev, struct hid_field *field,
 			 struct hid_usage *usage, __s32 value)
 {
 	struct xpadneo_devdata *xdata = hid_get_drvdata(hdev);
 	struct input_dev *gamepad = xdata->gamepad;
 	struct input_dev *consumer = xdata->consumer;
 
-	if (usage->type == EV_ABS) {
+	if (xdata->mouse_mode && usage->type == EV_ABS) {
+		switch (usage->code) {
+		case ABS_X:
+			xdata->mouse_state.rel_x = value - 32768;
+			break;
+		case ABS_Y:
+			xdata->mouse_state.rel_y = value - 32768;
+			break;
+		}
+	} else if (usage->type == EV_ABS) {
 		switch (usage->code) {
 		case ABS_X:
 		case ABS_Y:
@@ -1191,6 +1218,43 @@ static int xpadneo_init_synthetic(struct xpadneo_devdata *xdata, char *suffix,
 	return 0;
 }
 
+static int xpadneo_init_mouse(struct xpadneo_devdata *xdata)
+{
+	struct hid_device *hdev = xdata->hdev;
+	int ret;
+
+	ret = xpadneo_init_synthetic(xdata, "Mouse", &xdata->mouse);
+	if (ret || !xdata->mouse)
+		return ret;
+
+	/* enable relative events for mouse emulation */
+	__set_bit(EV_REL, xdata->mouse->evbit);
+	__set_bit(REL_X, xdata->mouse->relbit);
+	__set_bit(REL_Y, xdata->mouse->relbit);
+	__set_bit(REL_HWHEEL, xdata->mouse->relbit);
+	__set_bit(REL_WHEEL, xdata->mouse->relbit);
+
+	/* enable button events for mouse emulation */
+	__set_bit(EV_KEY, xdata->mouse->evbit);
+	__set_bit(BTN_LEFT, xdata->mouse->keybit);
+	__set_bit(BTN_RIGHT, xdata->mouse->keybit);
+	__set_bit(BTN_MIDDLE, xdata->mouse->keybit);
+	__set_bit(BTN_SIDE, xdata->mouse->keybit);
+	__set_bit(BTN_EXTRA, xdata->mouse->keybit);
+	__set_bit(BTN_FORWARD, xdata->mouse->keybit);
+	__set_bit(BTN_BACK, xdata->mouse->keybit);
+	__set_bit(BTN_TASK, xdata->mouse->keybit);
+
+	ret = input_register_device(xdata->mouse);
+	if (ret) {
+		hid_err(hdev, "failed to register mouse\n");
+		return ret;
+	}
+
+	hid_info(hdev, "mouse added\n");
+	return 0;
+}
+
 static int xpadneo_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	int ret;
@@ -1219,6 +1283,12 @@ static int xpadneo_probe(struct hid_device *hdev, const struct hid_device_id *id
 		return ret;
 	}
 
+	if (!xdata->mouse) {
+		ret = xpadneo_init_mouse(xdata);
+		if (ret)
+			return ret;
+	}
+
 	ret = xpadneo_init_hw(hdev);
 	if (ret) {
 		hid_err(hdev, "hw init failed: %d\n", ret);
@@ -1230,6 +1300,9 @@ static int xpadneo_probe(struct hid_device *hdev, const struct hid_device_id *id
 	if (ret)
 		hid_err(hdev, "could not initialize ff, continuing anyway\n");
 
+	timer_setup(&xdata->mouse_timer, xpadneo_mouse_event, 0);
+	mod_timer(&xdata->mouse_timer, jiffies);
+
 	hid_info(hdev, "%s connected\n", xdata->battery.name);
 
 	return 0;
@@ -1249,6 +1322,7 @@ static void xpadneo_remove(struct hid_device *hdev)
 
 	hid_hw_close(hdev);
 
+	del_timer_sync(&xdata->mouse_timer);
 	cancel_delayed_work_sync(&xdata->ff_worker);
 
 	kfree(xdata->battery.name);

hid-xpadneo/src/xpadneo.h

@@ -12,6 +12,7 @@
 #define XPADNEO_H_FILE
 
 #include <linux/hid.h>
+#include <linux/timer.h>
 #include <linux/version.h>
 
 #include "hid-ids.h"
@@ -125,7 +126,7 @@ struct xpadneo_devdata {
 
 	/* logical device interfaces */
 	struct hid_device *hdev;
-	struct input_dev *consumer, *gamepad, *keyboard;
+	struct input_dev *consumer, *gamepad, *keyboard, *mouse;
 	short int missing_reported;
 
 	/* quirk flags */
@@ -138,6 +139,10 @@ struct xpadneo_devdata {
 
 	/* mouse mode */
 	bool mouse_mode;
+	struct timer_list mouse_timer;
+	struct {
+		s32 rel_x, rel_y, wheel_x, wheel_y;
+	} mouse_state;
 
 	/* trigger scale */
 	struct {