xpadneo, mouse: Implement mouse support

Add an optional "mouse profile" that turns supported Xbox controllers
into a couch-friendly mouse/keyboard input device. The mode can be
toggled via Guide+Select and reuses the existing input infrastructure
by registering an additional (synthetic) mouse device.

In mouse mode:
- left stick moves the pointer (REL_X/REL_Y)
- right stick scrolls (REL_WHEEL/REL_HWHEEL)
- triggers act as left/right mouse buttons with hysteresis
- shoulder buttons provide back/forward
- D-pad generates cursor keys (keyboard interface)
- A/B map to Enter/Escape (keyboard interface)
- X triggers the on-screen keyboard key event (consumer control)

Movement and scrolling are emitted periodically via a timer to provide
a stable update rate and to keep input processing isolated from HID
report timing.

Co-authored-by: Jacob Essex <git@jacobessex.com>
Co-authored-by: Florian Dollinger <dollinger.florian@gmx.de>
Closes: atar-axis#99
Closes: atar-axis#105
Closes: atar-axis#160
Closes: atar-axis#511
Fixes: atar-axis#333
See-also: atar-axis#419
See-also: atar-axis#435
Signed-off-by: Kai Krakow <kai@kaishome.de>

Author: 3 people

docs/README.md

@@ -99,6 +99,7 @@ PID 0x0B22 while the other models identify with PID 0x0B13. This has some known
 - Supports customization through profiles (work in progress)
 - Optional high-precision mode for Wine/Proton users (disables dead zones so games don't apply an additional one)
 - Share button support on supported controllers
+- Works as a mouse if you are in couch-mode (press <key>Guide</key>+<key>Select</key>)
 
 
 ## Unavailable Features
@@ -253,6 +254,24 @@ or Y while holding down the Xbox logo button. However, the following caveats app
 parameter `disable_shift_mode`).
 
 
+### 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>
+
+**Important:** The mouse profile won't work if you disabled the shift-mode of the Xbox logo button (module parameter
+`disable_shift_mode`).
+
+
 ## Getting Started
 
 ### Distribution Packages

hid-xpadneo/src/Makefile

@@ -10,4 +10,4 @@ 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

@@ -785,20 +785,6 @@ static const __u8 *xpadneo_report_fixup(struct hid_device *hdev, __u8 *rdesc, un
 	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)
 {
@@ -905,6 +891,9 @@ static int xpadneo_raw_event(struct hid_device *hdev, struct hid_report *report,
 		}
 	}
 
+	if (xpadneo_mouse_raw_event(xdata, report, data, reportsize))
+		return -1;
+
 	return 0;
 }
 
@@ -937,6 +926,7 @@ 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) {
@@ -990,6 +980,9 @@ 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 */
@@ -1320,6 +1313,10 @@ 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);
@@ -1331,6 +1328,9 @@ 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;
@@ -1366,6 +1366,7 @@ static void xpadneo_remove(struct hid_device *hdev)
 		hdev->product = xdata->original_product;
 	}
 
+	timer_delete_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"
@@ -20,6 +21,16 @@
 #error "kernel version 4.19.0+ required for ida_simple_{alloc,free}()"
 #endif
 
+/* v6.15: del_timer_sync() renamed to timer_delete_sync() */
+#if KERNEL_VERSION(6, 15, 0) > LINUX_VERSION_CODE
+#define timer_delete_sync(t) del_timer_sync(t)
+#endif
+
+/* v6.16: from_timer() renamed to timer_container_of() */
+#ifndef timer_container_of
+#define timer_container_of(v, c, t) from_timer(v, c, t)
+#endif
+
 #ifndef VERSION
 #error "xpadneo version not defined"
 #endif
@@ -151,8 +162,8 @@ struct xpadneo_devdata {
 
 	/* logical device interfaces */
 	struct hid_device *hdev;
-	struct input_dev *consumer, *gamepad, *keyboard;
-	bool consumer_sync, gamepad_sync, keyboard_sync;
+	struct input_dev *consumer, *gamepad, *keyboard, *mouse;
+	bool consumer_sync, gamepad_sync, keyboard_sync, mouse_sync;
 	short int missing_reported;
 
 	/* revert fixups on removal */
@@ -169,6 +180,14 @@ struct xpadneo_devdata {
 
 	/* mouse mode */
 	bool mouse_mode;
+	struct timer_list mouse_timer;
+	struct {
+		s32 rel_x, rel_y, wheel_x, wheel_y;
+		s32 rel_x_err, rel_y_err, wheel_x_err, wheel_y_err;
+		struct {
+			bool left, right;
+		} analog_button;
+	} mouse_state;
 
 	/* trigger scale */
 	struct {
@@ -206,8 +225,13 @@ 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 int xpadneo_mouse_raw_event(struct xpadneo_devdata *, struct hid_report *, u8 *, int);
 extern void xpadneo_report(struct hid_device *, struct hid_report *);
 extern void xpadneo_core_missing(struct xpadneo_devdata *, u32);
+extern void xpadneo_mouse_report(struct timer_list *);
+extern void xpadneo_toggle_mouse(struct xpadneo_devdata *);
 
 #endif

hid-xpadneo/src/xpadneo/consumer.c

@@ -18,6 +18,9 @@ extern int xpadneo_init_consumer(struct xpadneo_devdata *xdata)
 			return ret;
 	}
 
+	/* enable consumer events for mouse mode */
+	input_set_capability(xdata->consumer, EV_KEY, KEY_ONSCREEN_KEYBOARD);
+
 	if (synth) {
 		ret = input_register_device(xdata->consumer);
 		if (ret) {

hid-xpadneo/src/xpadneo/core.c

@@ -55,6 +55,11 @@ extern void xpadneo_report(struct hid_device *hdev, struct hid_report *report)
 		xdata->keyboard_sync = false;
 		input_sync(xdata->keyboard);
 	}
+
+	if (xdata->mouse && xdata->mouse_sync) {
+		xdata->mouse_sync = false;
+		input_sync(xdata->mouse);
+	}
 }
 
 extern void xpadneo_core_missing(struct xpadneo_devdata *xdata, u32 flag)
@@ -64,6 +69,9 @@ extern void xpadneo_core_missing(struct xpadneo_devdata *xdata, u32 flag)
 	if ((xdata->missing_reported & flag) == 0) {
 		xdata->missing_reported |= flag;
 		switch (flag) {
+		case XPADNEO_MISSING_CONSUMER:
+			hid_err(hdev, "consumer control not detected\n");
+			break;
 		case XPADNEO_MISSING_GAMEPAD:
 			hid_err(hdev, "gamepad not detected\n");
 			break;

hid-xpadneo/src/xpadneo/keyboard.c

@@ -21,6 +21,14 @@ extern int xpadneo_init_keyboard(struct xpadneo_devdata *xdata)
 	/* enable key events for keyboard */
 	input_set_capability(xdata->keyboard, EV_KEY, BTN_SHARE);
 
+	/* enable key events for mouse mode */
+	input_set_capability(xdata->keyboard, EV_KEY, KEY_ESC);
+	input_set_capability(xdata->keyboard, EV_KEY, KEY_ENTER);
+	input_set_capability(xdata->keyboard, EV_KEY, KEY_UP);
+	input_set_capability(xdata->keyboard, EV_KEY, KEY_LEFT);
+	input_set_capability(xdata->keyboard, EV_KEY, KEY_RIGHT);
+	input_set_capability(xdata->keyboard, EV_KEY, KEY_DOWN);
+
 	if (synth) {
 		ret = input_register_device(xdata->keyboard);
 		if (ret) {