[WIP] xpadneo, mouse: Implement mouse support

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

Author: 3 people

docs/README.md

@@ -164,6 +164,21 @@ or Y while holding down the Xbox logo button. However, the following caveats app
 - If you hold the button for too long, the controller will turn off - we cannot prevent that.
 
 
+### Mouse Profile Support
+
+The driver can switch to emulating a mouse (and limited keyboard) on all supported controllers. Press
+<key>Guide</key>+<key>Select</key> to switch to mouse mode or back to controller mode:
+
+- Left stick moves the mouse pointer
+- Right stick can be used as a scrolling wheel/ball
+- Triggers for left and right mouse button
+- Shoulder buttons for back and forward button
+- D-pad for cursor movement
+- Menu to show on-screen keyboard (FIXME possible? KEY_KEYBOARD)
+- A for <key>Enter</key>
+- B for <key>Escape</key>
+
+
 ## Getting Started
 
 ### Distribution Packages

hid-xpadneo/src/Makefile

@@ -9,4 +9,4 @@ hid-xpadneo-y += xpadneo.o
 $(obj)/xpadneo.c: $(src)/hid-xpadneo.c
 	cp $< $@
 
-hid-xpadneo-y += xpadneo/core.o xpadneo/consumer.o xpadneo/keyboard.o
+hid-xpadneo-y += xpadneo/core.o xpadneo/consumer.o xpadneo/keyboard.o xpadneo/mouse.o

hid-xpadneo/src/hid-xpadneo.c

@@ -696,20 +696,6 @@ static u8 *xpadneo_report_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int
 	return rdesc;
 }
 
-static void xpadneo_toggle_mouse(struct xpadneo_devdata *xdata)
-{
-	if (xdata->mouse_mode) {
-		xdata->mouse_mode = false;
-		hid_info(xdata->hdev, "mouse mode disabled\n");
-	} else {
-		xdata->mouse_mode = true;
-		hid_info(xdata->hdev, "mouse mode enabled\n");
-	}
-
-	/* Indicate that a request was made */
-	xdata->profile_switched = true;
-}
-
 static void xpadneo_switch_profile(struct xpadneo_devdata *xdata, const u8 profile,
 				   const bool emulated)
 {
@@ -841,6 +827,7 @@ 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;
 	}
 
 	if (param_disable_deadzones) {
@@ -884,6 +871,9 @@ static int xpadneo_event(struct hid_device *hdev, struct hid_field *field,
 	struct input_dev *gamepad = xdata->gamepad;
 	struct input_dev *keyboard = xdata->keyboard;
 
+	if (xpadneo_mouse_event(xdata, usage, value))
+		goto stop_processing;
+
 	if ((usage->type == EV_KEY) && (usage->code == BTN_PADDLES(0))) {
 		if (gamepad && xdata->profile == 0) {
 			/* report the paddles individually */
@@ -1169,6 +1159,10 @@ static int xpadneo_probe(struct hid_device *hdev, const struct hid_device_id *id
 	if (ret)
 		return ret;
 
+	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);
@@ -1180,6 +1174,9 @@ 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_report, 0);
+	mod_timer(&xdata->mouse_timer, jiffies);
+
 	hid_info(hdev, "%s connected\n", xdata->battery.name);
 
 	return 0;
@@ -1215,6 +1212,7 @@ static void xpadneo_remove(struct hid_device *hdev)
 		hdev->product = xdata->original_product;
 	}
 
+	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"
@@ -131,7 +132,7 @@ 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;
 
 	/* revert fixups on removal */
@@ -148,6 +149,13 @@ struct xpadneo_devdata {
 
 	/* mouse mode */
 	bool mouse_mode;
+	struct timer_list mouse_timer;
+	struct {
+		s32 rel_x, rel_y, wheel_x, wheel_y;
+		struct {
+			bool left, right;
+		} analog_button;
+	} mouse_state;
 
 	/* trigger scale */
 	struct {
@@ -185,6 +193,10 @@ struct xpadneo_devdata {
 
 extern int xpadneo_init_consumer(struct xpadneo_devdata *);
 extern int xpadneo_init_keyboard(struct xpadneo_devdata *);
+extern int xpadneo_init_mouse(struct xpadneo_devdata *);
 extern int xpadneo_init_synthetic(struct xpadneo_devdata *, char *, struct input_dev **);
+extern int xpadneo_mouse_event(struct xpadneo_devdata *, struct hid_usage *, __s32);
+extern void xpadneo_mouse_report(struct timer_list *);
+extern void xpadneo_toggle_mouse(struct xpadneo_devdata *);
 
 #endif

hid-xpadneo/src/xpadneo/keyboard.c

@@ -20,6 +20,7 @@ extern int xpadneo_init_keyboard(struct xpadneo_devdata *xdata)
 
 	/* enable key events for keyboard */
 	input_set_capability(xdata->keyboard, EV_KEY, BTN_SHARE);
+	input_set_capability(xdata->consumer, EV_KEY, KEY_KEYBOARD);
 
 	if (synth) {
 		ret = input_register_device(xdata->keyboard);

hid-xpadneo/src/xpadneo/mouse.c

@@ -0,0 +1,150 @@
+/*
+ * xpadneo mouse driver
+ *
+ * Copyright (c) 2021 Kai Krakow <kai@kaishome.de>
+ */
+
+#include "../xpadneo.h"
+
+extern void xpadneo_toggle_mouse(struct xpadneo_devdata *xdata)
+{
+	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 {
+		xdata->mouse_mode = true;
+		hid_info(xdata->hdev, "mouse mode enabled\n");
+	}
+
+	/* Indicate that a request was made */
+	xdata->profile_switched = true;
+}
+
+#define mouse_report_rel(a,v) if((v)!=0)input_report_rel(mouse,a,v)
+extern void xpadneo_mouse_report(struct timer_list *t)
+{
+	struct xpadneo_devdata *xdata = from_timer(xdata, t, mouse_timer);
+	struct input_dev *mouse = xdata->mouse;
+
+	mod_timer(&xdata->mouse_timer, jiffies + msecs_to_jiffies(10));
+
+	if (xdata->mouse_mode) {
+		mouse_report_rel(REL_X, xdata->mouse_state.rel_x);
+		mouse_report_rel(REL_Y, xdata->mouse_state.rel_y);
+		mouse_report_rel(REL_HWHEEL, xdata->mouse_state.wheel_x);
+		mouse_report_rel(REL_WHEEL, xdata->mouse_state.wheel_y);
+		input_sync(xdata->mouse);
+	}
+
+}
+
+#define rescale_axis(v,d) (((v)<(d)&&(v)>-(d))?0:(32768*((v)>0?(v)-(d):(v)+(d))/(32768-(d))))
+extern int xpadneo_mouse_event(struct xpadneo_devdata *xdata, struct hid_usage *usage, __s32 value)
+{
+	if (!xdata->mouse_mode)
+		return 0;
+
+	if (usage->type == EV_ABS) {
+		switch (usage->code) {
+		case ABS_X:
+			xdata->mouse_state.rel_x = rescale_axis(value - 32768, 3072) / 2048;
+			return 1;
+		case ABS_Y:
+			xdata->mouse_state.rel_y = rescale_axis(value - 32768, 3072) / 2048;
+			return 1;
+		case ABS_RX:
+			xdata->mouse_state.wheel_x = rescale_axis(value - 32768, 3072) / 8192;
+			return 1;
+		case ABS_RY:
+			xdata->mouse_state.wheel_y = rescale_axis(value - 32768, 3072) / 8192;
+			return 1;
+		case ABS_Z:
+			if (xdata->mouse_state.analog_button.left && value < 384) {
+				xdata->mouse_state.analog_button.left = false;
+				input_report_key(xdata->mouse, BTN_LEFT, 0);
+				input_sync(xdata->mouse);
+			} else if (!xdata->mouse_state.analog_button.left && value > 640) {
+				xdata->mouse_state.analog_button.left = true;
+				input_report_key(xdata->mouse, BTN_LEFT, 1);
+				input_sync(xdata->mouse);
+			}
+			return 1;
+		case ABS_RZ:
+			if (xdata->mouse_state.analog_button.right && value < 384) {
+				xdata->mouse_state.analog_button.right = false;
+				input_report_key(xdata->mouse, BTN_RIGHT, 0);
+				input_sync(xdata->mouse);
+			} else if (!xdata->mouse_state.analog_button.right && value > 640) {
+				xdata->mouse_state.analog_button.right = true;
+				input_report_key(xdata->mouse, BTN_RIGHT, 1);
+				input_sync(xdata->mouse);
+			}
+			return 1;
+		}
+	} else if (usage->type == EV_KEY) {
+		switch (usage->code) {
+		case BTN_TL:
+			input_report_key(xdata->mouse, BTN_SIDE, value);
+			input_sync(xdata->mouse);
+			return 1;
+		case BTN_TR:
+			input_report_key(xdata->mouse, BTN_EXTRA, value);
+			input_sync(xdata->mouse);
+			return 1;
+		case BTN_START:
+			if (xdata->consumer) {
+				input_report_key(xdata->consumer, KEY_KEYBOARD, value);
+				input_sync(xdata->consumer);
+			}
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+extern int xpadneo_init_mouse(struct xpadneo_devdata *xdata)
+{
+	struct hid_device *hdev = xdata->hdev;
+	int ret, synth = 0;
+
+	if (!xdata->mouse) {
+		synth = 1;
+		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);
+
+	if (synth) {
+		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;
+}