add mouse mode mouse compatability

separate 3 modes: media, WASD, mouse

.gitignore

@@ -1,42 +1,42 @@
-# IDE and Editor
+# IDE and Editor
-.vscode/
+.vscode/
-.idea/
+.idea/
-*.swp
+*.swp
-*.swo
+*.swo
-*~
+*~
-.DS_Store
+.DS_Store
-
+
-# Dependencies
+# Dependencies
-node_modules/
+node_modules/
-__pycache__/
+__pycache__/
-*.pyc
+*.pyc
-*.pyo
+*.pyo
-*.egg-info/
+*.egg-info/
-.venv/
+.venv/
-venv/
+venv/
-
+
-# Build outputs
+# Build outputs
-dist/
+dist/
-build/
+build/
-*.o
+*.o
-*.a
+*.a
-*.so
+*.so
-*.ko
+*.ko
-*.mod
+*.mod
-*.mod.c
+*.mod.c
-*.cmd
+*.cmd
-.*.cmd
+.*.cmd
-Module.symvers
+Module.symvers
-modules.order
+modules.order
-
+
-# Logs
+# Logs
-*.log
+*.log
-npm-debug.log*
+npm-debug.log*
-
+
-# Environment variables
+# Environment variables
-.env
+.env
-.env.local
+.env.local
-
+
-# OS files
+# OS files
-Thumbs.db
+Thumbs.db
-.DS_Store
+.DS_Store

README.md

@@ -1,5 +1,62 @@
+# Device Drivers
+----------------------------------
 
-Device Driver
+This repository contains Linux **kernel modules** (``.ko``) that implement low-level USB input drivers and expose device events through the Linux **input subsystem** (evdev).
-=============
 
-[Logitech G29 USB Protocol](logitech-G29.md)
+A helper tool (``usb_driver_manager.py``) is included to make it easier to:
+- list USB devices and their **interfaces**
+- load/unload (reload) a chosen ``.ko`` module
+- unbind/bind a selected interface to a chosen driver during development
+
+## Drivers
+----------
+
+### Mouse driver (``mouse/``)
+USB HID boot-protocol mouse driver.
+
+**Build:**
+```bash
+cd mouse
+make
+```
+
+### Logitech G29 media driver (``g29_media_usb/``)
+Logitech G29 driver that maps selected wheel inputs to media key events.
+
+**Current mapping (Mode 0):**
+- Red rotary clockwise / counter-clockwise  -> Volume Up / Volume Down
+- Return ("Enter")                          -> Play/Pause
+- Plus / Minus                              -> Next track / Previous track
+
+**Build:**
+```bash
+cd g29_media_usb
+make
+```
+
+After building, the module (``*.ko``) is typically placed under ``build/`` by the provided Makefiles.
+
+## USB Driver Manager
+---------------------
+
+**Usage examples:**
+```bash
+# Search for modules in these driver directories (the tool searches recursively)
+sudo python3 usb_driver_manager.py ./mouse ./g29_media_usb
+
+# Or point directly at build/ directories
+sudo python3 usb_driver_manager.py ./mouse/build ./g29_media_usb/build
+```
+
+**Workflow:**
+1. Select the USB device.
+2. (Optional but recommended for non-mouse devices) select the USB **interface** to bind.
+3. Select the kernel module.
+4. Confirm; the tool unbinds the current driver, reloads the module if needed, and binds the chosen interface.
+
+## Testing
+----------
+After binding the driver, use ``evtest`` to confirm key events:
+```bash
+sudo evtest
+```

g29-wheel/Makefile

@@ -0,0 +1,14 @@
+
+.PHONY: all clean install uninstall
+
+obj-m += g29_usb.o
+PWD := $(CURDIR)
+
+all:
+	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+	mkdir -p build
+	-mv -f -- *.ko *.mod.c *.o .*.o *.mod modules.order .*.cmd *.symvers build/
+
+clean:
+	$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
+	rm -rf build

g29-wheel/g29_usb.c

@@ -0,0 +1,616 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Logitech G29 -> Media Keys (USB interface driver)
+ *
+ * Proof-of-concept Linux kernel module for low-level programming course.
+ *
+ * This driver:
+ *   - Binds to a Logitech G29 USB interface (VID/PID match)
+ *   - Receives 12-byte input reports via an interrupt-IN URB
+ *   - Parses the report into a normalized state (Stage A)
+ *   - Translates selected signals into media key events (Stage B)
+ *
+ * Stage A is designed to remain stable across different mapping policies.
+ * Stage B is designed to be replaced/extended by swapping mapping tables
+ * or adding per-signal handler functions.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <linux/input.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/hid.h>
+
+#include "g29_usb.h"
+
+MODULE_AUTHOR("LLP group 16");
+MODULE_DESCRIPTION("Logitech G29 USB driver");
+MODULE_LICENSE("GPL");
+
+enum g29_mode {
+	G29_MODE_MEDIA = 0,
+	G29_MODE_WASD = 1,
+	G29_MODE_MOUSE = 2,
+};
+
+static int mode = G29_MODE_MEDIA;
+module_param(mode, int, 0644);
+MODULE_PARM_DESC(mode, "Initial mode (0=MEDIA, 1=WASD, 2=MOUSE)");
+
+/* Steering curve exponent (100 = linear, 200 = squared, 150 = ^1.5)
+ * Higher values reduce sensitivity at low steering angles.
+ */
+static int steer_curve = 200;
+module_param(steer_curve, int, 0644);
+MODULE_PARM_DESC(steer_curve, "Steering sensitivity curve (100=linear, 200=squared, default=200)");
+
+static int steer_deadzone = 10;
+module_param(steer_deadzone, int, 0644);
+MODULE_PARM_DESC(steer_deadzone, "Steering deadzone radius from center (default=10)");
+
+static int gas_curve = 100;
+module_param(gas_curve, int, 0644);
+MODULE_PARM_DESC(gas_curve, "Gas pedal sensitivity curve (100=linear, 200=squared, default=200)");
+
+static int clutch_curve = 100;
+module_param(clutch_curve, int, 0644);
+MODULE_PARM_DESC(clutch_curve, "Clutch pedal sensitivity curve (100=linear, 200=squared, default=200)");
+
+#define NORMALIZATION_PRECISION 1000
+
+struct g29_keymap {
+	u32 mask;
+	unsigned short keycode;
+};
+
+static const struct g29_keymap media_mode_keymap[] = {
+	/* Red rotary = volume */
+	{ G29_BTN_RED_CW,  KEY_VOLUMEUP },
+	{ G29_BTN_RED_CCW, KEY_VOLUMEDOWN },
+
+	/* Return = play/pause */
+	{ G29_BTN_RETURN,  KEY_PLAYPAUSE },
+
+	/* Plus/Minus = next/prev */
+	{ G29_BTN_R1,    KEY_NEXTSONG },
+	{ G29_BTN_L1,   KEY_PREVIOUSSONG },
+};
+
+static const struct g29_keymap mouse_mode_keymap[] = {
+	{ G29_BTN_X,      BTN_LEFT },
+	{ G29_BTN_CIRCLE, BTN_RIGHT },
+	{ G29_BTN_TRIANGLE, BTN_MIDDLE },
+	{ G29_BTN_SQUARE, BTN_SIDE },
+};
+
+struct g29_dev {
+	char name[128];
+	char phys[64];
+
+	struct usb_device *udev;
+	struct input_dev *input;
+
+	struct urb *urb;
+	u8 *buf;
+	dma_addr_t buf_dma;
+	int maxp;
+	int interval;
+	int endpoint;
+
+	struct timer_list steer_timer;
+	struct timer_list mouse_timer;
+	u32 steer_phase_ms;
+
+	u32 phase_accumulator;
+	u32 gas_phase_accumulator;
+	u32 clutch_phase_accumulator;
+
+	enum g29_mode current_mode;
+	struct g29_state last;
+};
+
+
+
+static void g29_switch_mode(struct g29_dev *g29, enum g29_mode new_mode) {
+	if (g29->current_mode == new_mode)
+		return;
+
+	/* Stop timers when leaving modes */
+	if (g29->current_mode == G29_MODE_WASD) {
+		timer_delete_sync(&g29->steer_timer);
+	}
+	if (g29->current_mode == G29_MODE_MOUSE) {
+		timer_delete_sync(&g29->mouse_timer);
+	}
+
+	g29->current_mode = new_mode;
+	g29->phase_accumulator = 0;
+	g29->gas_phase_accumulator = 0;
+	g29->clutch_phase_accumulator = 0;
+
+	/* Start timers when entering modes */
+	if (new_mode == G29_MODE_WASD) {
+		mod_timer(&g29->steer_timer, jiffies + msecs_to_jiffies(2));
+	}
+	if (new_mode == G29_MODE_MOUSE) {
+		mod_timer(&g29->mouse_timer, jiffies + msecs_to_jiffies(10));
+	}
+
+	dev_info(&g29->udev->dev, "Switched to mode: %s\n",
+		 new_mode == G29_MODE_MEDIA ? "MEDIA" :
+		 new_mode == G29_MODE_WASD ? "WASD" : "MOUSE");
+}
+
+static int calc_adjusted_steering_distance(int distance) {
+	/* Apply non-linear steering curve:
+	 * adjusted = (distance / MAX)^(curve/100) * MAX
+	 *
+	 * For curve=200 (squared): 5% input -> 0.25% output, 50% -> 25%, 100% -> 100%
+	 * For curve=150 (^1.5):    5% input -> ~1.1% output, 50% -> ~35%, 100% -> 100%
+	 * For curve=100 (linear):  5% input -> 5% output (no change)
+	 *
+	 * Using integer math: adjusted = (distance^2 / MAX) for curve=200
+	 */
+	if (steer_curve == 100) {
+		return distance;
+	}
+	if (steer_curve == 200) {
+		return(distance * distance) / WHEEL_MAX_DIST;
+	}
+
+	/* Generic power curve using normalized values (0-1000 range for precision)
+	 * normalized = (distance * 1000) / WHEEL_MAX_DIST
+	 * Apply power approximation, then scale back
+	 */
+	int normalized = (distance * NORMALIZATION_PRECISION) / WHEEL_MAX_DIST;
+	int powered;
+
+	if (steer_curve == 150) {
+		/* Approximate ^1.5 with (x * sqrt(x)) */
+		int sqrt_norm = int_sqrt(normalized * NORMALIZATION_PRECISION);
+		powered = (normalized * sqrt_norm) / NORMALIZATION_PRECISION;
+	} else {
+		/* Fallback: squared for any other value > 100 */
+		powered = (normalized * normalized) / NORMALIZATION_PRECISION;
+	}
+
+	return (powered * WHEEL_MAX_DIST) / NORMALIZATION_PRECISION;
+}
+
+static int calc_adjusted_pedal_distance(int pedal_pressure, int curve) {
+	if (curve == 100) {
+		return pedal_pressure;
+	}
+	if (curve == 200) {
+		return (pedal_pressure * pedal_pressure) / G29_PEDAL_RELEASED;
+	}
+
+	int normalized = (pedal_pressure * NORMALIZATION_PRECISION) / G29_PEDAL_RELEASED;
+	int powered;
+
+	if (curve == 150) {
+		int sqrt_norm = int_sqrt(normalized * NORMALIZATION_PRECISION);
+		powered = (normalized * sqrt_norm) / NORMALIZATION_PRECISION;
+	} else {
+		powered = (normalized * normalized) / NORMALIZATION_PRECISION;
+	}
+
+	return (powered * G29_PEDAL_RELEASED) / NORMALIZATION_PRECISION;
+}
+
+static void mouse_mode_timer_fn(struct timer_list *t) {
+	struct g29_dev *g29 = timer_container_of(g29, t, mouse_timer);
+
+	const int rot = le16_to_cpu(g29->last.rot_le);
+	int gas_pressure = G29_PEDAL_RELEASED - g29->last.gas;
+	int clutch_pressure = G29_PEDAL_RELEASED - g29->last.clt;
+	
+	/* Calculate speed: positive for forward (gas), negative for backward (clutch) */
+	int speed = gas_pressure - clutch_pressure;
+	
+	/* Apply deadzone to steering */
+	int effective_rot = rot;
+	if (abs(rot - WHEEL_CENTER) <= steer_deadzone) {
+		effective_rot = WHEEL_CENTER;
+	}
+	
+	/* Calculate angle from wheel rotation
+	 * Map wheel rotation to angle: 
+	 * - Center (32768) = 0° (straight forward)
+	 * - Full left (0) = -180° (reverse)
+	 * - Full right (65535) = +180° (reverse)
+	 * We normalize to -1000 to +1000 representing -π to +π radians
+	 */
+	int angle_normalized = ((effective_rot - WHEEL_CENTER) * 1000) / WHEEL_CENTER;
+	
+	/* Clamp angle to prevent overflow */
+	if (angle_normalized > 1000) angle_normalized = 1000;
+	if (angle_normalized < -1000) angle_normalized = -1000;
+	
+	/* Calculate movement components using better trigonometric approximations:
+	 * dx = sin(angle) * speed
+	 * dy = cos(angle) * speed
+	 * 
+	 * sin(x) ≈ x - x³/6  (Taylor series)
+	 * cos(x) ≈ 1 - x²/2 + x⁴/24  (Taylor series)
+	 * 
+	 * For angle_normalized in [-1000, 1000] representing [-π, +π]:
+	 * This gives us full reverse when fully steered
+	 */
+	long angle_cubed = ((long)angle_normalized * angle_normalized * angle_normalized) / 1000000;
+	int sin_approx = (angle_normalized * 1000 - angle_cubed / 6) / 1000;
+	
+	long angle_squared = ((long)angle_normalized * angle_normalized) / 1000;
+	long angle_fourth = (angle_squared * angle_squared) / 1000;
+	int cos_approx = 1000 - angle_squared / 2 + angle_fourth / 24;
+	
+	int dx = (sin_approx * speed) / 1000;
+	int dy = -(cos_approx * speed) / 1000;  /* Negative because forward is -Y */
+	
+	/* Scale down the movement for reasonable mouse speed */
+	int scaled_dx = dx / 50;
+	int scaled_dy = dy / 50;
+	
+	/* Report mouse movement if there's any */
+	if (scaled_dx != 0 || scaled_dy != 0) {
+		input_report_rel(g29->input, REL_X, scaled_dx);
+		input_report_rel(g29->input, REL_Y, scaled_dy);
+		input_sync(g29->input);
+	}
+	
+	/* Reschedule timer if still in mouse mode */
+	if (g29->current_mode == G29_MODE_MOUSE)
+		mod_timer(&g29->mouse_timer, jiffies + msecs_to_jiffies(10));
+}
+static void wasd_mode_timer_fn(struct timer_list *t) {
+	struct g29_dev *g29 = timer_container_of(g29, t, steer_timer);
+
+	const int rot = le16_to_cpu(g29->last.rot_le);
+	
+	int effective_rot = rot;
+	int distance_from_center = abs(rot - WHEEL_CENTER);
+	if (distance_from_center <= steer_deadzone) {
+		effective_rot = WHEEL_CENTER;
+	}
+	
+	int distance_to_center = abs(effective_rot - WHEEL_CENTER);
+	int adjusted_distance = calc_adjusted_steering_distance(distance_to_center);
+
+	/* Phase accumulator approach:
+	 * Accumulate the adjusted distance on each tick.
+	 * When it exceeds the max distance, press the key and wrap.
+	 * This gives us a duty cycle of (adjusted_distance / WHEEL_MAX_DIST).
+	 *
+	 * Examples (with curve=200):
+	 *   5% steering  -> ~0.25% press rate
+	 *   50% steering -> 25% press rate
+	 *   100% steering -> 100% press rate (every tick)
+	 */
+	g29->phase_accumulator += adjusted_distance;
+
+	bool press_key;
+	if (g29->phase_accumulator >= WHEEL_MAX_DIST) {
+		g29->phase_accumulator -= WHEEL_MAX_DIST;
+		press_key = true;
+	} else {
+		press_key = false;
+	}
+
+	input_report_key(g29->input, KEY_A, press_key && (effective_rot < WHEEL_CENTER));
+	input_report_key(g29->input, KEY_D, press_key && (effective_rot >= WHEEL_CENTER));
+
+	/* Gas pedal (0xFF=up, 0x00=down) -> W key */
+	int gas_pressure = 0xFF - g29->last.gas;
+	int gas_adjusted = calc_adjusted_pedal_distance(gas_pressure, gas_curve);
+	g29->gas_phase_accumulator += gas_adjusted;
+
+	bool press_w = false;
+	if (g29->gas_phase_accumulator >= G29_PEDAL_RELEASED) {
+		g29->gas_phase_accumulator -= G29_PEDAL_RELEASED;
+		press_w = true;
+	}
+
+	/* Clutch pedal (0xFF=up, 0x00=down) -> S key */
+	int clutch_pressure = 0xFF - g29->last.clt;
+	int clutch_adjusted = calc_adjusted_pedal_distance(clutch_pressure, clutch_curve);
+	g29->clutch_phase_accumulator += clutch_adjusted;
+
+	bool press_s = false;
+	if (g29->clutch_phase_accumulator >= G29_PEDAL_RELEASED) {
+		g29->clutch_phase_accumulator -= G29_PEDAL_RELEASED;
+		press_s = true;
+	}
+
+	input_report_key(g29->input, KEY_W, press_w);
+	input_report_key(g29->input, KEY_S, press_s);
+
+	input_sync(g29->input);
+
+	if (g29->current_mode == G29_MODE_WASD)
+		mod_timer(&g29->steer_timer, jiffies + msecs_to_jiffies(2));
+}
+
+static void process_media_mode(struct g29_dev *g29, const struct g29_state *cur, const struct g29_state *prev) {
+	const u32 pressed = le32_to_cpu(cur->buttons_le & ~prev->buttons_le);
+	const u32 released = le32_to_cpu(~cur->buttons_le & prev->buttons_le);
+	for (int i = 0; i < ARRAY_SIZE(media_mode_keymap); i++) {
+		const struct g29_keymap *k = &media_mode_keymap[i];
+		if (pressed & k->mask) {
+			input_report_key(g29->input, k->keycode, 1);
+		}
+		if (released & k->mask) {
+			input_report_key(g29->input, k->keycode, 0);
+		}
+	}
+	input_sync(g29->input);
+}
+
+static void process_wasd_mode(struct g29_dev *g29, const struct g29_state *cur, const struct g29_state *prev) {
+	/* WASD mode is handled by the timer function (g29_steer_timer_fn) */
+	/* No additional processing needed here */
+}
+
+static void process_mouse_mode(struct g29_dev *g29, const struct g29_state *cur, const struct g29_state *prev) {
+	const u32 pressed = le32_to_cpu(cur->buttons_le & ~prev->buttons_le);
+	const u32 released = le32_to_cpu(~cur->buttons_le & prev->buttons_le);
+
+	for (int i = 0; i < ARRAY_SIZE(mouse_mode_keymap); i++) {
+		const struct g29_keymap *k = &mouse_mode_keymap[i];
+		if (pressed & k->mask) {
+			input_report_key(g29->input, k->keycode, 1);
+		}
+		if (released & k->mask) {
+			input_report_key(g29->input, k->keycode, 0);
+		}
+	}
+
+	if (pressed & G29_BTN_RED_CW) {
+		input_report_rel(g29->input, REL_WHEEL, 1);
+	}
+	if (pressed & G29_BTN_RED_CCW) {
+		input_report_rel(g29->input, REL_WHEEL, -1);
+	}
+	
+	input_sync(g29->input);
+}
+
+static void g29_check_mode_switch(struct g29_dev *g29, const struct g29_state *cur, const struct g29_state *prev) {
+	u32 pressed = le32_to_cpu(cur->buttons_le & ~prev->buttons_le);
+	
+	if (pressed & G29_BTN_SHARE) {
+		g29_switch_mode(g29, G29_MODE_MEDIA);
+	} else if (pressed & G29_BTN_OPTION) {
+		g29_switch_mode(g29, G29_MODE_WASD);
+	} else if (pressed & G29_BTN_PS3_LOGO) {
+		g29_switch_mode(g29, G29_MODE_MOUSE);
+	}
+}
+
+static void g29_process_report(struct g29_dev *g29, const u8 *data, unsigned int len) {
+	if (len < 12) return;
+
+	struct g29_state *cur = (void *) data;
+	
+	g29_check_mode_switch(g29, cur, &g29->last);
+	
+	switch (g29->current_mode) {
+		case G29_MODE_MEDIA:
+			process_media_mode(g29, cur, &g29->last);
+			break;
+		case G29_MODE_WASD:
+			process_wasd_mode(g29, cur, &g29->last);
+			break;
+		case G29_MODE_MOUSE:
+			process_mouse_mode(g29, cur, &g29->last);
+			break;
+	}
+
+	g29->last = *cur;
+}
+
+static void g29_urb_complete(struct urb *urb) {
+	struct g29_dev *g29 = urb->context;
+	int ret;
+
+	switch (urb->status) {
+	case 0:
+		break; /* success */
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return; /* cancelled/disconnected */
+	default:
+		goto resubmit; /* transient error */
+	}
+
+	g29_process_report(g29, g29->buf, urb->actual_length);
+
+resubmit:
+	ret = usb_submit_urb(urb, GFP_ATOMIC);
+	if (ret)
+		dev_err(&g29->udev->dev, "usb_submit_urb failed: %d\n", ret);
+}
+
+static int g29_input_open(struct input_dev *input) {
+	struct g29_dev *g29 = input_get_drvdata(input);
+
+	g29->urb->dev = g29->udev;
+	if (usb_submit_urb(g29->urb, GFP_KERNEL))
+		return -EIO;
+
+	g29_switch_mode(g29, mode);
+
+	return 0;
+}
+
+static void g29_input_close(struct input_dev *input) {
+	struct g29_dev *g29 = input_get_drvdata(input);
+	
+	if (g29->current_mode == G29_MODE_WASD)
+		timer_delete_sync(&g29->steer_timer);
+	if (g29->current_mode == G29_MODE_MOUSE)
+		timer_delete_sync(&g29->mouse_timer);
+	
+	usb_kill_urb(g29->urb);
+}
+
+static int g29_probe(struct usb_interface *intf, const struct usb_device_id *id) {
+	struct usb_device *udev = interface_to_usbdev(intf);
+	int ret;
+
+	/* Find an interrupt IN endpoint capable of carrying the 12-byte report. */
+	struct usb_endpoint_descriptor *ep = NULL;
+	const struct usb_host_interface *alts = intf->cur_altsetting;
+	for (int i = 0; i < alts->desc.bNumEndpoints; i++) {
+		struct usb_endpoint_descriptor *d = &alts->endpoint[i].desc;
+		if (!usb_endpoint_is_int_in(d))
+			continue;
+		if (usb_maxpacket(udev, usb_rcvintpipe(udev, d->bEndpointAddress)) >= 12) {
+			ep = d;
+			break;
+		}
+	}
+	if (!ep) return -ENODEV;
+
+	struct g29_dev *g29;
+	if ((g29 = kzalloc(sizeof(*g29), GFP_KERNEL)) == NULL) {
+		return -ENOMEM;
+	}
+
+	struct input_dev *input;
+	if ((input = input_allocate_device()) == NULL) {
+		ret = -ENOMEM;
+		goto err_free_g29;
+	}
+
+	g29->udev = udev;
+	g29->input = input;
+
+	g29->endpoint = usb_endpoint_num(ep);
+	g29->maxp = usb_endpoint_maxp(ep);
+	g29->interval = ep->bInterval;
+	memset(&g29->last, 0, sizeof(g29->last));
+	g29->current_mode = mode;  /* Initialize to module parameter */
+
+	timer_setup(&g29->steer_timer, wasd_mode_timer_fn, 0);
+	timer_setup(&g29->mouse_timer, mouse_mode_timer_fn, 0);
+
+	if ((g29->buf = usb_alloc_coherent(udev, g29->maxp, GFP_KERNEL, &g29->buf_dma)) == NULL) {
+		ret = -ENOMEM;
+		goto err_free_input;
+	}
+
+	if ((g29->urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) {
+		ret = -ENOMEM;
+		goto err_free_buf;
+	}
+
+	if (udev->manufacturer)
+		strscpy(g29->name, udev->manufacturer, sizeof(g29->name));
+	if (udev->product) {
+		if (udev->manufacturer)
+			strlcat(g29->name, " ", sizeof(g29->name));
+		strlcat(g29->name, udev->product, sizeof(g29->name));
+	}
+	if (!strlen(g29->name))
+		snprintf(g29->name, sizeof(g29->name),
+			 "Logitech G29 USB %04x:%04x",
+			 le16_to_cpu(udev->descriptor.idVendor),
+			 le16_to_cpu(udev->descriptor.idProduct));
+
+	usb_make_path(udev, g29->phys, sizeof(g29->phys));
+	strlcat(g29->phys, "/input0", sizeof(g29->phys));
+
+	input->name = g29->name;
+	input->phys = g29->phys;
+	usb_to_input_id(udev, &input->id);
+	input->dev.parent = &intf->dev;
+
+	__set_bit(EV_KEY, input->evbit);
+	__set_bit(EV_REL, input->evbit);
+
+	/* Media mode keys */
+	input_set_capability(input, EV_KEY, KEY_VOLUMEUP);
+	input_set_capability(input, EV_KEY, KEY_VOLUMEDOWN);
+	input_set_capability(input, EV_KEY, KEY_PLAYPAUSE);
+	input_set_capability(input, EV_KEY, KEY_NEXTSONG);
+	input_set_capability(input, EV_KEY, KEY_PREVIOUSSONG);
+
+	/* WASD mode keys */
+	input_set_capability(input, EV_KEY, KEY_W);
+	input_set_capability(input, EV_KEY, KEY_A);
+	input_set_capability(input, EV_KEY, KEY_S);
+	input_set_capability(input, EV_KEY, KEY_D);
+
+	/* Mouse mode capabilities */
+	input_set_capability(input, EV_KEY, BTN_LEFT);
+	input_set_capability(input, EV_KEY, BTN_RIGHT);
+	input_set_capability(input, EV_KEY, BTN_MIDDLE);
+	input_set_capability(input, EV_REL, REL_X);
+	input_set_capability(input, EV_REL, REL_Y);
+	input_set_capability(input, EV_REL, REL_WHEEL);
+
+	input_set_drvdata(input, g29);
+	input->open = g29_input_open;
+	input->close = g29_input_close;
+
+	usb_fill_int_urb(g29->urb, udev, usb_rcvintpipe(udev, ep->bEndpointAddress),
+			 g29->buf, g29->maxp,
+			 g29_urb_complete, g29, ep->bInterval);
+	g29->urb->transfer_dma = g29->buf_dma;
+	g29->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	if ((ret = input_register_device(input)) != 0) {
+		goto err_free_urb;
+	}
+
+	usb_set_intfdata(intf, g29);
+
+	dev_info(&intf->dev,
+		 "G29 media driver bound (ep=%02x interval=%u)\n",
+		 ep->bEndpointAddress, ep->bInterval);
+
+	return 0;
+
+err_free_urb:
+	usb_free_urb(g29->urb);
+err_free_buf:
+	usb_free_coherent(udev, g29->maxp, g29->buf, g29->buf_dma);
+err_free_input:
+	input_free_device(input);
+err_free_g29:
+	kfree(g29);
+	return ret;
+}
+
+static void g29_disconnect(struct usb_interface *intf) {
+	struct g29_dev *g29 = usb_get_intfdata(intf);
+	usb_set_intfdata(intf, NULL);
+	if (!g29) return;
+	usb_kill_urb(g29->urb);
+	input_unregister_device(g29->input);
+	usb_free_urb(g29->urb);
+	usb_free_coherent(interface_to_usbdev(intf), g29->maxp, g29->buf, g29->buf_dma);
+	kfree(g29);
+	dev_info(&intf->dev, "G29 driver disconnected\n");
+}
+
+static const struct usb_device_id g29_id_table[] = {
+	{ USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G29) },
+	{ USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_G29_ALT) },
+	{ }
+};
+MODULE_DEVICE_TABLE(usb, g29_id_table);
+
+static struct usb_driver g29_driver = {
+	.name = "g29_usb",
+	.id_table = g29_id_table,
+	.probe = g29_probe,
+	.disconnect = g29_disconnect,
+};
+
+module_usb_driver(g29_driver);

g29-wheel/g29_usb.h

@@ -0,0 +1,76 @@
+/*
+ * Logitech G29 USB/HID Protocol Definitions
+ */
+
+#ifndef G29_USB_H
+#define G29_USB_H
+
+#include <linux/types.h>
+
+#define USB_VENDOR_ID_LOGITECH      0x046d
+#define USB_DEVICE_ID_LOGITECH_G29  0xc24f
+#define USB_DEVICE_ID_LOGITECH_G29_ALT 0xc260
+
+#define G29_BTN_X           0x00000010u
+#define G29_BTN_SQUARE      0x00000020u
+#define G29_BTN_CIRCLE      0x00000040u
+#define G29_BTN_TRIANGLE    0x00000080u
+#define G29_BTN_R1          0x00000100u
+#define G29_BTN_L1          0x00000200u
+#define G29_BTN_R2          0x00000400u
+#define G29_BTN_L2          0x00000800u
+#define G29_BTN_SHARE       0x00001000u
+#define G29_BTN_OPTION      0x00002000u
+#define G29_BTN_R3          0x00004000u
+#define G29_BTN_L3          0x00008000u
+#define G29_BTN_GEAR_1      0x00010000u
+#define G29_BTN_GEAR_2      0x00020000u
+#define G29_BTN_GEAR_3      0x00040000u
+#define G29_BTN_GEAR_4      0x00080000u
+#define G29_BTN_GEAR_5      0x00100000u
+#define G29_BTN_GEAR_6      0x00200000u
+#define G29_BTN_GEAR_REV    0x00400000u
+#define G29_BTN_PLUS        0x00800000u
+#define G29_BTN_MINUS       0x01000000u
+#define G29_BTN_RED_CW      0x02000000u
+#define G29_BTN_RED_CCW     0x04000000u
+#define G29_BTN_RETURN      0x08000000u
+#define G29_BTN_PS3_LOGO     0xF0000000u
+
+#define G29_DPAD_MASK       0x0000000Eu
+#define G29_DPAD_UP         0x00000000u
+#define G29_DPAD_RIGHT      0x00000002u
+#define G29_DPAD_DOWN       0x00000004u
+#define G29_DPAD_LEFT       0x00000006u
+#define G29_DPAD_NONE       0x00000008u
+
+#define G29_WHEEL_MIN_ROTATION           0x0000
+#define G29_WHEEL_MAX_ROTATION           0xFFFF
+
+#define G29_PEDAL_RELEASED      0xFF
+#define G29_PEDAL_PRESSED       0x00
+#define G29_PEDAL_THRESHOLD     0x80
+
+#define G29_GEARSHIFT_X_LEFT    0x30   /* Gears 1-2 */
+#define G29_GEARSHIFT_X_CENTER  0x80   /* Gears 3-4 */
+#define G29_GEARSHIFT_X_RIGHT   0xB0   /* Gears 5-6-R */
+#define G29_GEARSHIFT_Y_TOP     0xD0   /* Gears 1-3-5 */
+#define G29_GEARSHIFT_Y_BOTTOM  0x40   /* Gears 2-4-6-R */
+#define G29_GEARSHIFT_Z_NEUTRAL 0x9C   /* Neutral position */
+#define G29_GEARSHIFT_Z_PRESSED 0xDC   /* Pressed down */
+
+#define WHEEL_CENTER        32768
+#define WHEEL_MAX_DIST      32768
+
+struct g29_state {
+	u32 buttons_le;  /* Button bitmask (little-endian) */
+	u16 rot_le;      /* Wheel rotation (little-endian) */
+	u8 gas;          /* Gas pedal (0xFF=up, 0x00=down) */
+	u8 brk;          /* Brake pedal (0xFF=up, 0x00=down) */
+	u8 clt;          /* Clutch pedal (0xFF=up, 0x00=down) */
+	u8 gr_x;         /* Gearshift X-axis */
+	u8 gr_y;         /* Gearshift Y-axis */
+	u8 gr_z;         /* Gearshift Z-axis */
+} __packed;
+
+#endif

logitech-G29.md

@@ -45,7 +45,7 @@ Logitech G29 USB Protocol
     - `0x02000000` - Red rotation clockwise
     - `0x04000000` - Red rotation counterclockwise
     - `0x08000000` - Return
-    - `0xF0000000` - ?
+    - `0xF0000000` - Playstation 3 Logo Button (verify)
 - `Rot`: Wheel rotation (little-endian). `0x0000` (leftmost) - `0xFFFF` (rightmost).
 - `Gas`: Gas pedal. `0xFF` (up, default) - `0x00` (down).
 - `Brk`: Brake pedal. `0xFF` (up, default) - `0x00` (down).

mouse/simple_usb_mouse.c

@@ -1,357 +1,357 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0
-/*
+/*
- * Simple USB Mouse Driver
+ * Simple USB Mouse Driver
- *
+ *
- * A minimal USB HID Boot Protocol mouse driver for learning purposes.
+ * A minimal USB HID Boot Protocol mouse driver for learning purposes.
- * This driver can bind to any standard USB mouse that supports the
+ * This driver can bind to any standard USB mouse that supports the
- * HID Boot Protocol.
+ * HID Boot Protocol.
- */
+ */
-
+
-#include <linux/kernel.h>
+#include <linux/kernel.h>
-#include <linux/slab.h>
+#include <linux/slab.h>
-#include <linux/module.h>
+#include <linux/module.h>
-#include <linux/init.h>
+#include <linux/init.h>
-#include <linux/usb.h>
+#include <linux/usb.h>
-#include <linux/usb/input.h>
+#include <linux/usb/input.h>
-#include <linux/hid.h>
+#include <linux/hid.h>
-#include <linux/input.h>
+#include <linux/input.h>
-
+
-#define DRIVER_AUTHOR "Testor"
+#define DRIVER_AUTHOR "Testor"
-#define DRIVER_DESC "Simple USB Mouse Driver"
+#define DRIVER_DESC "Simple USB Mouse Driver"
-
+
-MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL");
-
+
-/*
+/*
- * Driver context structure
+ * Driver context structure
- * This holds all the data we need for each connected mouse
+ * This holds all the data we need for each connected mouse
- */
+ */
-struct simple_usb_mouse {
+struct simple_usb_mouse {
-    char name[128];                  /* Device name */
+    char name[128];                  /* Device name */
-    char phys[64];                   /* Physical path */
+    char phys[64];                   /* Physical path */
-    struct usb_device *usbdev;       /* USB device */
+    struct usb_device *usbdev;       /* USB device */
-    struct input_dev *input_dev;     /* Input device for reporting events */
+    struct input_dev *input_dev;     /* Input device for reporting events */
-    struct urb *irq;                 /* URB for interrupt transfers */
+    struct urb *irq;                 /* URB for interrupt transfers */
-    unsigned char *data;             /* Data buffer (8 bytes for mouse data) */
+    unsigned char *data;             /* Data buffer (8 bytes for mouse data) */
-    dma_addr_t data_dma;            /* DMA address for data buffer */
+    dma_addr_t data_dma;            /* DMA address for data buffer */
-};
+};
-
+
-/*
+/*
- * IRQ handler - called when mouse sends data
+ * IRQ handler - called when mouse sends data
- *
+ *
- * Cooler Master MM710 format (8 bytes):
+ * Cooler Master MM710 format (8 bytes):
- * Byte 0: Button states
+ * Byte 0: Button states
- *   Bit 0: Left button
+ *   Bit 0: Left button
- *   Bit 1: Right button
+ *   Bit 1: Right button
- *   Bit 2: Middle button
+ *   Bit 2: Middle button
- *   Bit 3: Side button
+ *   Bit 3: Side button
- *   Bit 4: Extra button
+ *   Bit 4: Extra button
- * Bytes 1: (unused)
+ * Bytes 1: (unused)
- * Bytes 2-3: X movement (16-bit signed, little-endian)
+ * Bytes 2-3: X movement (16-bit signed, little-endian)
- * Bytes 4-5: Y movement (16-bit signed, little-endian)
+ * Bytes 4-5: Y movement (16-bit signed, little-endian)
- * Byte 6: Wheel movement (8-bit signed)
+ * Byte 6: Wheel movement (8-bit signed)
- * Byte 7: (unused)
+ * Byte 7: (unused)
- */
+ */
-static void simple_mouse_irq(struct urb *urb)
+static void simple_mouse_irq(struct urb *urb)
-{
+{
-    struct simple_usb_mouse *mouse = urb->context;
+    struct simple_usb_mouse *mouse = urb->context;
-    unsigned char *data = mouse->data;
+    unsigned char *data = mouse->data;
-    struct input_dev *dev = mouse->input_dev;
+    struct input_dev *dev = mouse->input_dev;
-    int status;
+    int status;
-    int16_t x_movement, y_movement;
+    int16_t x_movement, y_movement;
-
+
-    /* Check URB status */
+    /* Check URB status */
-    switch (urb->status) {
+    switch (urb->status) {
-        case 0:
+        case 0:
-            /* Success - process the data */
+            /* Success - process the data */
-            break;
+            break;
-        case -ECONNRESET:
+        case -ECONNRESET:
-        case -ENOENT:
+        case -ENOENT:
-        case -ESHUTDOWN:
+        case -ESHUTDOWN:
-            /* Device disconnected or URB killed - don't resubmit */
+            /* Device disconnected or URB killed - don't resubmit */
-            pr_debug("simple_mouse:  URB stopped (status %d)\n", urb->status);
+            pr_debug("simple_mouse:  URB stopped (status %d)\n", urb->status);
-            return;
+            return;
-        default:
+        default:
-            /* Transient error - we'll resubmit and try again */
+            /* Transient error - we'll resubmit and try again */
-            pr_debug("simple_mouse: URB error (status %d)\n", urb->status);
+            pr_debug("simple_mouse: URB error (status %d)\n", urb->status);
-            goto resubmit;
+            goto resubmit;
-    }
+    }
-
+
-    /* Debug: Print raw data bytes */
+    /* Debug: Print raw data bytes */
-    /* pr_info("simple_mouse: RAW DATA: [0]=%02x [1]=%02x [2]=%02x [3]=%02x [4]=%02x [5]=%02x [6]=%02x [7]=%02x\n",
+    /* pr_info("simple_mouse: RAW DATA: [0]=%02x [1]=%02x [2]=%02x [3]=%02x [4]=%02x [5]=%02x [6]=%02x [7]=%02x\n",
-            data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7]); */
+            data[0], data[1], data[2], data[3], data[4], data[5], data[6], data[7]); */
-
+
-    /* Report button states */
+    /* Report button states */
-    input_report_key(dev, BTN_LEFT,   data[0] & 0x01);
+    input_report_key(dev, BTN_LEFT,   data[0] & 0x01);
-    input_report_key(dev, BTN_RIGHT,  data[0] & 0x02);
+    input_report_key(dev, BTN_RIGHT,  data[0] & 0x02);
-    input_report_key(dev, BTN_MIDDLE, data[0] & 0x04);
+    input_report_key(dev, BTN_MIDDLE, data[0] & 0x04);
-    input_report_key(dev, BTN_SIDE,   data[0] & 0x08);
+    input_report_key(dev, BTN_SIDE,   data[0] & 0x08);
-    input_report_key(dev, BTN_EXTRA,  data[0] & 0x10);
+    input_report_key(dev, BTN_EXTRA,  data[0] & 0x10);
-
+
-    /* Combine bytes for 16-bit movement (little-endian) */
+    /* Combine bytes for 16-bit movement (little-endian) */
-    x_movement = (int16_t)(data[2] | (data[3] << 8));
+    x_movement = (int16_t)(data[2] | (data[3] << 8));
-    y_movement = (int16_t)(data[4] | (data[5] << 8));
+    y_movement = (int16_t)(data[4] | (data[5] << 8));
-
+
-    /* Report movement (relative coordinates) */
+    /* Report movement (relative coordinates) */
-    input_report_rel(dev, REL_X, x_movement);
+    input_report_rel(dev, REL_X, x_movement);
-    input_report_rel(dev, REL_Y, y_movement);
+    input_report_rel(dev, REL_Y, y_movement);
-    input_report_rel(dev, REL_WHEEL, (signed char) data[6]);
+    input_report_rel(dev, REL_WHEEL, (signed char) data[6]);
-
+
-    /* Sync - tell input subsystem we're done with this event */
+    /* Sync - tell input subsystem we're done with this event */
-    input_sync(dev);
+    input_sync(dev);
-
+
-    resubmit:
+    resubmit:
-    /* Resubmit URB to continue receiving data */
+    /* Resubmit URB to continue receiving data */
-    status = usb_submit_urb(urb, GFP_ATOMIC);
+    status = usb_submit_urb(urb, GFP_ATOMIC);
-    if (status) {
+    if (status) {
-        dev_err(&mouse->usbdev->dev,
+        dev_err(&mouse->usbdev->dev,
-                "Failed to resubmit URB: %d\n", status);
+                "Failed to resubmit URB: %d\n", status);
-    }
+    }
-}
+}
-
+
-/*
+/*
- * Called when device is opened (e.g., when an application reads from it)
+ * Called when device is opened (e.g., when an application reads from it)
- * We start the URB here to save resources when mouse isn't being used
+ * We start the URB here to save resources when mouse isn't being used
- */
+ */
-static int simple_mouse_open(struct input_dev *dev)
+static int simple_mouse_open(struct input_dev *dev)
-{
+{
-    struct simple_usb_mouse *mouse = input_get_drvdata(dev);
+    struct simple_usb_mouse *mouse = input_get_drvdata(dev);
-
+
-    pr_info("simple_mouse: Device opened\n");
+    pr_info("simple_mouse: Device opened\n");
-
+
-    mouse->irq->dev = mouse->usbdev;
+    mouse->irq->dev = mouse->usbdev;
-    if (usb_submit_urb(mouse->irq, GFP_KERNEL)) {
+    if (usb_submit_urb(mouse->irq, GFP_KERNEL)) {
-        pr_err("simple_mouse: Failed to submit URB on open\n");
+        pr_err("simple_mouse: Failed to submit URB on open\n");
-        return -EIO;
+        return -EIO;
-    }
+    }
-
+
-    return 0;
+    return 0;
-}
+}
-
+
-/*
+/*
- * Called when device is closed
+ * Called when device is closed
- * Stop the URB to save resources
+ * Stop the URB to save resources
- */
+ */
-static void simple_mouse_close(struct input_dev *dev)
+static void simple_mouse_close(struct input_dev *dev)
-{
+{
-    struct simple_usb_mouse *mouse = input_get_drvdata(dev);
+    struct simple_usb_mouse *mouse = input_get_drvdata(dev);
-
+
-    pr_info("simple_mouse: Device closed\n");
+    pr_info("simple_mouse: Device closed\n");
-    usb_kill_urb(mouse->irq);
+    usb_kill_urb(mouse->irq);
-}
+}
-
+
-/*
+/*
- * Probe function - called when a matching USB device is connected
+ * Probe function - called when a matching USB device is connected
- */
+ */
-static int simple_mouse_probe(struct usb_interface *intf,
+static int simple_mouse_probe(struct usb_interface *intf,
-                              const struct usb_device_id *id)
+                              const struct usb_device_id *id)
-{
+{
-    struct usb_device *usbdev = interface_to_usbdev(intf);
+    struct usb_device *usbdev = interface_to_usbdev(intf);
-    struct usb_host_interface *interface;
+    struct usb_host_interface *interface;
-    struct usb_endpoint_descriptor *endpoint;
+    struct usb_endpoint_descriptor *endpoint;
-    struct simple_usb_mouse *mouse;
+    struct simple_usb_mouse *mouse;
-    struct input_dev *input_dev;
+    struct input_dev *input_dev;
-    int pipe, maxp;
+    int pipe, maxp;
-    int error = -ENOMEM;
+    int error = -ENOMEM;
-
+
-    pr_info("simple_mouse:  Probing device %04x:%04x\n",
+    pr_info("simple_mouse:  Probing device %04x:%04x\n",
-            le16_to_cpu(usbdev->descriptor.idVendor),
+            le16_to_cpu(usbdev->descriptor.idVendor),
-            le16_to_cpu(usbdev->descriptor. idProduct));
+            le16_to_cpu(usbdev->descriptor. idProduct));
-
+
-    interface = intf->cur_altsetting;
+    interface = intf->cur_altsetting;
-
+
-    /* Validate interface has exactly 1 endpoint */
+    /* Validate interface has exactly 1 endpoint */
-    if (interface->desc.bNumEndpoints != 1) {
+    if (interface->desc.bNumEndpoints != 1) {
-        pr_err("simple_mouse: Interface has %d endpoints (expected 1)\n",
+        pr_err("simple_mouse: Interface has %d endpoints (expected 1)\n",
-               interface->desc.bNumEndpoints);
+               interface->desc.bNumEndpoints);
-        return -ENODEV;
+        return -ENODEV;
-    }
+    }
-
+
-    endpoint = &interface->endpoint[0]. desc;
+    endpoint = &interface->endpoint[0]. desc;
-
+
-    /* Ensure it's an interrupt IN endpoint */
+    /* Ensure it's an interrupt IN endpoint */
-    if (! usb_endpoint_is_int_in(endpoint)) {
+    if (! usb_endpoint_is_int_in(endpoint)) {
-        pr_err("simple_mouse: Endpoint is not interrupt IN\n");
+        pr_err("simple_mouse: Endpoint is not interrupt IN\n");
-        return -ENODEV;
+        return -ENODEV;
-    }
+    }
-
+
-    /* Calculate pipe and max packet size */
+    /* Calculate pipe and max packet size */
-    pipe = usb_rcvintpipe(usbdev, endpoint->bEndpointAddress);
+    pipe = usb_rcvintpipe(usbdev, endpoint->bEndpointAddress);
-    maxp = usb_maxpacket(usbdev, pipe);
+    maxp = usb_maxpacket(usbdev, pipe);
-
+
-    /* Allocate our context structure */
+    /* Allocate our context structure */
-    mouse = kzalloc(sizeof(struct simple_usb_mouse), GFP_KERNEL);
+    mouse = kzalloc(sizeof(struct simple_usb_mouse), GFP_KERNEL);
-    if (!mouse)
+    if (!mouse)
-        return -ENOMEM;
+        return -ENOMEM;
-
+
-    /* Allocate input device */
+    /* Allocate input device */
-    input_dev = input_allocate_device();
+    input_dev = input_allocate_device();
-    if (!input_dev) {
+    if (!input_dev) {
-        pr_err("simple_mouse: Failed to allocate input device\n");
+        pr_err("simple_mouse: Failed to allocate input device\n");
-        goto fail_input_alloc;
+        goto fail_input_alloc;
-    }
+    }
-
+
-    /* Allocate DMA-coherent buffer for USB data */
+    /* Allocate DMA-coherent buffer for USB data */
-    mouse->data = usb_alloc_coherent(usbdev, 8, GFP_KERNEL,
+    mouse->data = usb_alloc_coherent(usbdev, 8, GFP_KERNEL,
-                                     &mouse->data_dma);
+                                     &mouse->data_dma);
-    if (!mouse->data) {
+    if (!mouse->data) {
-        pr_err("simple_mouse: Failed to allocate DMA buffer\n");
+        pr_err("simple_mouse: Failed to allocate DMA buffer\n");
-        goto fail_dma_alloc;
+        goto fail_dma_alloc;
-    }
+    }
-
+
-    /* Allocate URB */
+    /* Allocate URB */
-    mouse->irq = usb_alloc_urb(0, GFP_KERNEL);
+    mouse->irq = usb_alloc_urb(0, GFP_KERNEL);
-    if (!mouse->irq) {
+    if (!mouse->irq) {
-        pr_err("simple_mouse: Failed to allocate URB\n");
+        pr_err("simple_mouse: Failed to allocate URB\n");
-        goto fail_urb_alloc;
+        goto fail_urb_alloc;
-    }
+    }
-
+
-    /* Store references */
+    /* Store references */
-    mouse->usbdev = usbdev;
+    mouse->usbdev = usbdev;
-    mouse->input_dev = input_dev;
+    mouse->input_dev = input_dev;
-
+
-    /* Build device name from USB descriptors */
+    /* Build device name from USB descriptors */
-    if (usbdev->manufacturer)
+    if (usbdev->manufacturer)
-        strscpy(mouse->name, usbdev->manufacturer, sizeof(mouse->name));
+        strscpy(mouse->name, usbdev->manufacturer, sizeof(mouse->name));
-
+
-    if (usbdev->product) {
+    if (usbdev->product) {
-        if (usbdev->manufacturer)
+        if (usbdev->manufacturer)
-            strlcat(mouse->name, " ", sizeof(mouse->name));
+            strlcat(mouse->name, " ", sizeof(mouse->name));
-        strlcat(mouse->name, usbdev->product, sizeof(mouse->name));
+        strlcat(mouse->name, usbdev->product, sizeof(mouse->name));
-    }
+    }
-
+
-    /* Fallback name if no descriptors available */
+    /* Fallback name if no descriptors available */
-    if (! strlen(mouse->name)) {
+    if (! strlen(mouse->name)) {
-        snprintf(mouse->name, sizeof(mouse->name),
+        snprintf(mouse->name, sizeof(mouse->name),
-                 "Simple USB Mouse %04x:%04x",
+                 "Simple USB Mouse %04x:%04x",
-                 le16_to_cpu(usbdev->descriptor. idVendor),
+                 le16_to_cpu(usbdev->descriptor. idVendor),
-                 le16_to_cpu(usbdev->descriptor.idProduct));
+                 le16_to_cpu(usbdev->descriptor.idProduct));
-    }
+    }
-
+
-    /* Build physical path */
+    /* Build physical path */
-    usb_make_path(usbdev, mouse->phys, sizeof(mouse->phys));
+    usb_make_path(usbdev, mouse->phys, sizeof(mouse->phys));
-    strlcat(mouse->phys, "/input0", sizeof(mouse->phys));
+    strlcat(mouse->phys, "/input0", sizeof(mouse->phys));
-
+
-    pr_info("simple_mouse: Device name: %s\n", mouse->name);
+    pr_info("simple_mouse: Device name: %s\n", mouse->name);
-    pr_info("simple_mouse: Physical path: %s\n", mouse->phys);
+    pr_info("simple_mouse: Physical path: %s\n", mouse->phys);
-
+
-    /* Configure input device */
+    /* Configure input device */
-    input_dev->name = mouse->name;
+    input_dev->name = mouse->name;
-    input_dev->phys = mouse->phys;
+    input_dev->phys = mouse->phys;
-    usb_to_input_id(usbdev, &input_dev->id);
+    usb_to_input_id(usbdev, &input_dev->id);
-    input_dev->dev.parent = &intf->dev;
+    input_dev->dev.parent = &intf->dev;
-
+
-    /* Set event types we can generate */
+    /* Set event types we can generate */
-    input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+    input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
-
+
-    /* Set button capabilities */
+    /* Set button capabilities */
-    input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
+    input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
-    BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
+    BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
-    input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
+    input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
-    BIT_MASK(BTN_EXTRA);
+    BIT_MASK(BTN_EXTRA);
-
+
-    /* Set relative axis capabilities */
+    /* Set relative axis capabilities */
-    input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
+    input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
-    BIT_MASK(REL_WHEEL);
+    BIT_MASK(REL_WHEEL);
-
+
-    /* Set driver data and callbacks */
+    /* Set driver data and callbacks */
-    input_set_drvdata(input_dev, mouse);
+    input_set_drvdata(input_dev, mouse);
-    input_dev->open = simple_mouse_open;
+    input_dev->open = simple_mouse_open;
-    input_dev->close = simple_mouse_close;
+    input_dev->close = simple_mouse_close;
-
+
-    /* Initialize URB */
+    /* Initialize URB */
-    usb_fill_int_urb(mouse->irq, usbdev, pipe, mouse->data,
+    usb_fill_int_urb(mouse->irq, usbdev, pipe, mouse->data,
-                     (maxp > 8 ? 8 : maxp),
+                     (maxp > 8 ? 8 : maxp),
-                     simple_mouse_irq, mouse, endpoint->bInterval);
+                     simple_mouse_irq, mouse, endpoint->bInterval);
-    mouse->irq->transfer_dma = mouse->data_dma;
+    mouse->irq->transfer_dma = mouse->data_dma;
-    mouse->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+    mouse->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
-
+
-    /* Register input device with the kernel */
+    /* Register input device with the kernel */
-    error = input_register_device(mouse->input_dev);
+    error = input_register_device(mouse->input_dev);
-    if (error) {
+    if (error) {
-        pr_err("simple_mouse: Failed to register input device:  %d\n",
+        pr_err("simple_mouse: Failed to register input device:  %d\n",
-               error);
+               error);
-        goto fail_register;
+        goto fail_register;
-    }
+    }
-
+
-    /* Save our context in interface data */
+    /* Save our context in interface data */
-    usb_set_intfdata(intf, mouse);
+    usb_set_intfdata(intf, mouse);
-
+
-    pr_info("simple_mouse:  Probe successful!\n");
+    pr_info("simple_mouse:  Probe successful!\n");
-    return 0;
+    return 0;
-
+
-    /* Error handling - cleanup in reverse order */
+    /* Error handling - cleanup in reverse order */
-    fail_register:
+    fail_register:
-    usb_free_urb(mouse->irq);
+    usb_free_urb(mouse->irq);
-    fail_urb_alloc:
+    fail_urb_alloc:
-    usb_free_coherent(usbdev, 8, mouse->data, mouse->data_dma);
+    usb_free_coherent(usbdev, 8, mouse->data, mouse->data_dma);
-    fail_dma_alloc:
+    fail_dma_alloc:
-    input_free_device(input_dev);
+    input_free_device(input_dev);
-    fail_input_alloc:
+    fail_input_alloc:
-    kfree(mouse);
+    kfree(mouse);
-    return error;
+    return error;
-}
+}
-
+
-/*
+/*
- * Disconnect function - called when device is unplugged
+ * Disconnect function - called when device is unplugged
- */
+ */
-static void simple_mouse_disconnect(struct usb_interface *intf)
+static void simple_mouse_disconnect(struct usb_interface *intf)
-{
+{
-    struct simple_usb_mouse *mouse = usb_get_intfdata(intf);
+    struct simple_usb_mouse *mouse = usb_get_intfdata(intf);
-
+
-    pr_info("simple_mouse: Device disconnected\n");
+    pr_info("simple_mouse: Device disconnected\n");
-
+
-    /* Clear interface data */
+    /* Clear interface data */
-    usb_set_intfdata(intf, NULL);
+    usb_set_intfdata(intf, NULL);
-
+
-    if (mouse) {
+    if (mouse) {
-        /* Stop URB */
+        /* Stop URB */
-        usb_kill_urb(mouse->irq);
+        usb_kill_urb(mouse->irq);
-
+
-        /* Unregister from input subsystem */
+        /* Unregister from input subsystem */
-        input_unregister_device(mouse->input_dev);
+        input_unregister_device(mouse->input_dev);
-
+
-        /* Free URB */
+        /* Free URB */
-        usb_free_urb(mouse->irq);
+        usb_free_urb(mouse->irq);
-
+
-        /* Free DMA buffer */
+        /* Free DMA buffer */
-        usb_free_coherent(interface_to_usbdev(intf), 8,
+        usb_free_coherent(interface_to_usbdev(intf), 8,
-                          mouse->data, mouse->data_dma);
+                          mouse->data, mouse->data_dma);
-
+
-        /* Free context structure */
+        /* Free context structure */
-        kfree(mouse);
+        kfree(mouse);
-    }
+    }
-}
+}
-
+
-/*
+/*
- * Device ID table - matches ANY USB HID Boot Protocol mouse
+ * Device ID table - matches ANY USB HID Boot Protocol mouse
- * This is the key to binding to any mouse!
+ * This is the key to binding to any mouse!
- */
+ */
-static const struct usb_device_id simple_mouse_id_table[] = {
+static const struct usb_device_id simple_mouse_id_table[] = {
-    {
+    {
-        USB_INTERFACE_INFO(
+        USB_INTERFACE_INFO(
-            USB_INTERFACE_CLASS_HID,       /* Class:  HID */
+            USB_INTERFACE_CLASS_HID,       /* Class:  HID */
-            USB_INTERFACE_SUBCLASS_BOOT,   /* Subclass: Boot */
+            USB_INTERFACE_SUBCLASS_BOOT,   /* Subclass: Boot */
-            USB_INTERFACE_PROTOCOL_MOUSE   /* Protocol: Mouse */
+            USB_INTERFACE_PROTOCOL_MOUSE   /* Protocol: Mouse */
-        )
+        )
-    },
+    },
-    { } /* Terminating entry */
+    { } /* Terminating entry */
-};
+};
-
+
-MODULE_DEVICE_TABLE(usb, simple_mouse_id_table);
+MODULE_DEVICE_TABLE(usb, simple_mouse_id_table);
-
+
-/*
+/*
- * USB Driver structure
+ * USB Driver structure
- */
+ */
-static struct usb_driver simple_mouse_driver = {
+static struct usb_driver simple_mouse_driver = {
-    .name       = "simple_usb_mouse",
+    .name       = "simple_usb_mouse",
-    .probe      = simple_mouse_probe,
+    .probe      = simple_mouse_probe,
-    .disconnect = simple_mouse_disconnect,
+    .disconnect = simple_mouse_disconnect,
-    .id_table   = simple_mouse_id_table,
+    .id_table   = simple_mouse_id_table,
-};
+};
-
+
-/*
+/*
- * Module init/exit
+ * Module init/exit
- */
+ */
-module_usb_driver(simple_mouse_driver);
+module_usb_driver(simple_mouse_driver);

usb_driver_manager.py

@@ -6,6 +6,11 @@ and binding USB devices to new drivers.
 
 Note: USB drivers typically bind to interfaces, not devices. This script
 handles both device-level and interface-level driver binding.
+
+Wheel-friendly improvements:
+  - Finds kernel modules (*.ko) recursively under provided directories (e.g. ./build).
+  - Lets the user select which USB interface(s) to unbind/bind.
+    Default selection: all HID interfaces (bInterfaceClass==03).
 """
 
 import os
@@ -74,7 +79,7 @@ def get_usb_devices():
         result = subprocess.run(['lsusb'], capture_output=True, text=True)
         for line in result.stdout.splitlines():
             # Format: Bus 001 Device 005: ID 046d:c52b Logitech, Inc. Unifying Receiver
-            match = re.match(r'Bus (\d+) Device (\d+): ID ([0-9a-f]{4}):([0-9a-f]{4})\s+(.*)', line)
+            match = re.match(r'Bus (\d+) Device (\d+): ID ([0-9a-f]{4}):([0-9a-f]{4})\s+(.*)', line, re.IGNORECASE)
             if match:
                 bus, dev, vendor, product, name = match.groups()
                 key = f"{int(bus)}-{int(dev)}"
@@ -93,7 +98,7 @@ def get_usb_devices():
 
         # Only process actual device entries (format: busnum-devnum or busnum-port.port...)
         device_name = device_path.name
-        if not re.match(r'\d+-[\d.]+', device_name):
+        if not re.match(r'\d+-[\d.]+$', device_name):
             continue
 
         # Skip root hubs
@@ -116,21 +121,9 @@ def get_usb_devices():
             if driver_link.exists() and driver_link.is_symlink():
                 driver = driver_link.resolve().name
 
-            # Try to get better name from lsusb
-            lsusb_key = f"{int(busnum)}-{int(devnum)}"
-            if lsusb_key in lsusb_output:
-                product = lsusb_output[lsusb_key]['name']
-
-            # Check if it's an input device by looking at device class or interfaces
-            is_input = False
-            device_class = (device_path / "bDeviceClass").read_text().strip() if (device_path / "bDeviceClass").exists() else "00"
-
-            # Class 03 is HID (Human Interface Device)
-            if device_class == "03":
-                is_input = True
-
             # Check interfaces for HID class and collect interface information
             interfaces = []
+            is_input = False
             for interface_path in device_path.glob("*:*.*"):
                 if not interface_path.is_dir():
                     continue
@@ -160,6 +153,12 @@ def get_usb_devices():
                 except Exception:
                     continue
 
+            # Improve product string from lsusb when possible (safe conversion)
+            if busnum.isdigit() and devnum.isdigit():
+                lsusb_key = f"{int(busnum)}-{int(devnum)}"
+                if lsusb_key in lsusb_output:
+                    product = lsusb_output[lsusb_key]['name']
+
             devices.append({
                 'path': str(device_path),
                 'name': device_name,
@@ -172,7 +171,7 @@ def get_usb_devices():
                 'driver': driver,
                 'is_input': is_input,
                 'interfaces': interfaces,
-                'display_name': f"{manufacturer} {product}"
+                'display_name': f"{manufacturer} {product}".strip()
             })
 
         except Exception as e:
@@ -217,42 +216,45 @@ def get_kernel_modules(directories=None):
     modules = []
     seen_modules = set()  # Track module names to avoid duplicates
 
-    # Search for .ko files in each specified directory
+    # Search for .ko files recursively in each specified directory
     for directory in directories:
         if not os.path.exists(directory):
             print_warning(f"Directory not found: {directory}")
             continue
 
-        for ko_file in glob.glob(os.path.join(directory, "*.ko")):
+        for root, dirs, files in os.walk(directory):
-            module_name = os.path.basename(ko_file)
+            for filename in files:
-            module_path = os.path.abspath(ko_file)
+                if not filename.endswith('.ko'):
+                    continue
 
-            # Skip duplicates (same module name already found)
+                module_name = filename
-            if module_name in seen_modules:
+                module_path = os.path.abspath(os.path.join(root, filename))
-                continue
-            seen_modules.add(module_name)
 
-            # Get module info if possible
+                # Skip duplicates (same module name already found)
-            try:
+                if module_name in seen_modules:
-                result = subprocess.run(['modinfo', module_path],
+                    continue
-                                    capture_output=True, text=True)
+                seen_modules.add(module_name)
-                description = "No description"
-                for line in result.stdout.splitlines():
-                    if line.startswith("description:"):
-                        description = line.split(":", 1)[1].strip()
-                        break
 
-                modules.append({
+                # Get module info if possible
-                    'name': module_name,
+                try:
-                    'path': module_path,
+                    result = subprocess.run(['modinfo', module_path], capture_output=True, text=True)
-                    'description': description
+                    description = "No description"
-                })
+                    for line in result.stdout.splitlines():
-            except Exception:
+                        if line.startswith("description:"):
-                modules.append({
+                            description = line.split(":", 1)[1].strip()
-                    'name': module_name,
+                            break
-                    'path': module_path,
+
-                    'description': "No description available"
+                    modules.append({
-                })
+                        'name': module_name,
+                        'path': module_path,
+                        'description': description
+                    })
+                except Exception:
+                    modules.append({
+                        'name': module_name,
+                        'path': module_path,
+                        'description': "No description available"
+                    })
 
     return modules
 
@@ -295,6 +297,55 @@ def get_user_choice(prompt, max_choice):
             return None
 
 
+def get_interface_selection(device):
+    """Select which interface(s) to unbind/bind.
+
+    Default (Enter): all HID interfaces (class 03).
+    'a' selects all interfaces.
+    Comma-separated list selects specific interfaces.
+    """
+    if not device.get('interfaces'):
+        return []
+
+    print_header("Interfaces")
+    for idx, iface in enumerate(device['interfaces'], 1):
+        driver_color = Colors.GREEN if iface['driver'] != "none" else Colors.YELLOW
+        print(f"  {idx:>2}. {iface['name']}: class={iface['class']} subclass={iface['subclass']} protocol={iface['protocol']} driver={driver_color}{iface['driver']}{Colors.END}")
+
+    print("\nSelect interfaces to bind:")
+    print("  [Enter]  AUTO: all HID interfaces (class 03)")
+    print("  a        ALL interfaces")
+    print("  1,3      Comma-separated list")
+
+    raw = input("Selection: ").strip().lower()
+    if raw == "":
+        picked = [i for i in device['interfaces'] if i['class'] == "03"]
+        if not picked:
+            print_warning("No HID interfaces found; selecting ALL interfaces.")
+            picked = list(device['interfaces'])
+        return picked
+
+    if raw == "a":
+        return list(device['interfaces'])
+
+    picked = []
+    parts = [p.strip() for p in raw.split(',') if p.strip()]
+    for p in parts:
+        try:
+            i = int(p)
+            if 1 <= i <= len(device['interfaces']):
+                picked.append(device['interfaces'][i - 1])
+        except ValueError:
+            continue
+
+    if not picked:
+        print_warning("No valid interfaces selected; using AUTO (all HID interfaces).")
+        picked = [i for i in device['interfaces'] if i['class'] == "03"]
+        if not picked:
+            picked = list(device['interfaces'])
+    return picked
+
+
 def unbind_device(device, interface=None):
     """Unbind device interface from current driver"""
     # If specific interface provided, unbind that interface
@@ -355,8 +406,7 @@ def load_module(module):
     """Load kernel module"""
     try:
         print(f"Loading module {module['name']}...")
-        result = subprocess.run(['insmod', module['path']],
+        result = subprocess.run(['insmod', module['path']], capture_output=True, text=True)
-                              capture_output=True, text=True)
         if result.returncode == 0:
             print_success(f"Successfully loaded {module['name']}")
             return True
@@ -435,7 +485,7 @@ def bind_device(device, module, interface=None):
             print_error(f"Failed to bind interface: {e}")
             return False
 
-    # Otherwise try to bind all HID mouse interfaces (class 03, subclass 01, protocol 02)
+    # Default behavior (kept for backwards compatibility): try boot mouse, then device.
     target_interfaces = []
     for iface in device.get('interfaces', []):
         # Look for HID Boot Mouse interfaces
@@ -482,13 +532,35 @@ def bind_device(device, module, interface=None):
     return success
 
 
+def bind_interface_to_driver(interface_name, driver_name):
+    """Bind a specific USB interface back to a given driver name (sysfs)."""
+    driver_path = Path(f"/sys/bus/usb/drivers/{driver_name}")
+    bind_path = driver_path / "bind"
+
+    if not driver_path.exists():
+        print_warning(f"Cannot restore: driver path not found: {driver_path}")
+        return False
+
+    if not bind_path.exists():
+        print_warning(f"Cannot restore: bind path not found: {bind_path}")
+        return False
+
+    try:
+        print(f"Restoring interface {interface_name} to driver {driver_name}...")
+        bind_path.write_text(interface_name)
+        print_success(f"Restored {interface_name} to {driver_name}")
+        return True
+    except Exception as e:
+        print_warning(f"Failed to restore interface {interface_name} to {driver_name}: {e}")
+        return False
+
+
 def unload_module(module):
     """Unload kernel module"""
     driver_name = get_module_driver_name(module)
     try:
         print(f"Unloading module {driver_name}...")
-        result = subprocess.run(['rmmod', driver_name],
+        result = subprocess.run(['rmmod', driver_name], capture_output=True, text=True)
-                              capture_output=True, text=True)
         if result.returncode == 0:
             print_success(f"Successfully unloaded {driver_name}")
             return True
@@ -562,12 +634,16 @@ def main():
     print(f"  Device: {selected_device['name']}")
     print(f"  Current driver: {selected_device['driver']}")
 
-    # Show interfaces
+    # Step 2b: Select interfaces
-    if selected_device.get('interfaces'):
+    selected_interfaces = get_interface_selection(selected_device)
-        print(f"\n  Interfaces:")
+    if not selected_interfaces:
-        for iface in selected_device['interfaces']:
+        print_warning("No interfaces available/selected; cannot bind.")
-            driver_color = Colors.GREEN if iface['driver'] != "none" else Colors.YELLOW
+        sys.exit(1)
-            print(f"    {iface['name']}: class={iface['class']} subclass={iface['subclass']} protocol={iface['protocol']} driver={driver_color}{iface['driver']}{Colors.END}")
+
+    # Remember original per-interface drivers for restore attempts
+    original_interface_drivers = {}
+    for iface in selected_interfaces:
+        original_interface_drivers[iface['name']] = iface.get('driver', 'none')
 
     # Step 3: List available kernel modules
     if len(args.directories) > 1 or args.directories[0] != '.':
@@ -594,17 +670,14 @@ def main():
 
     # Step 5: Confirm operation
     print(f"\n{Colors.YELLOW}This will:{Colors.END}")
-    if selected_device.get('interfaces'):
+    print(f"  1. Unbind {len(selected_interfaces)} interface(s) from current driver(s)")
-        print(f"  1. Unbind interface(s) from current driver(s)")
-    else:
-        print(f"  1. Unbind {selected_device['name']} from {selected_device['driver']}")
     if module_already_loaded:
         print(f"  2. Unload existing module {selected_module['name']}")
         print(f"  3. Load module {selected_module['name']} (fresh version)")
-        print(f"  4. Bind interface(s) to the new driver")
+        print(f"  4. Bind selected interface(s) to the new driver")
     else:
         print(f"  2. Load module {selected_module['name']}")
-        print(f"  3. Bind interface(s) to the new driver")
+        print(f"  3. Bind selected interface(s) to the new driver")
 
     confirm = input(f"\n{Colors.BOLD}Proceed? (yes/no): {Colors.END}").strip().lower()
     if confirm not in ['yes', 'y']:
@@ -614,10 +687,11 @@ def main():
     # Step 6: Perform operations
     print_header("\nExecuting operations...")
 
-    # Unbind from current driver
+    # Unbind selected interfaces from current drivers
-    if not unbind_device(selected_device):
+    for iface in selected_interfaces:
-        print_error("Failed to unbind device. Aborting.")
+        if not unbind_device(selected_device, iface):
-        sys.exit(1)
+            print_error("Failed to unbind interface. Aborting.")
+            sys.exit(1)
 
     # Unload module if already loaded
     if module_already_loaded:
@@ -631,24 +705,36 @@ def main():
     # Load new module
     if not load_module(selected_module):
         print_error("Failed to load module. Attempting to restore...")
-        # Try to rebind to original driver if available
+        # Try to rebind each selected interface to its original driver
-        if selected_device['driver'] != "none":
+        for iface in selected_interfaces:
-            bind_device(selected_device, {'name': selected_device['driver'] + '.ko'})
+            orig = original_interface_drivers.get(iface['name'], 'none')
+            if orig != 'none':
+                bind_interface_to_driver(iface['name'], orig)
         sys.exit(1)
 
     # Give kernel time to auto-probe and bind
     print("Waiting for kernel to probe interfaces...")
     time.sleep(0.5)
 
-    # Bind to new driver
+    # Bind selected interfaces to new driver
-    if not bind_device(selected_device, selected_module):
+    bound_any = False
-        print_error("Failed to bind device to new driver.")
+    for iface in selected_interfaces:
-        print_warning("Device may be unbound. You might need to reconnect it or bind manually.")
+        if bind_device(selected_device, selected_module, iface):
+            bound_any = True
+        else:
+            # Restore interfaces that failed to bind to the new driver
+            orig = original_interface_drivers.get(iface['name'], 'none')
+            if orig != 'none':
+                bind_interface_to_driver(iface['name'], orig)
+
+    if not bound_any:
+        print_error("Failed to bind any interface to the new driver.")
+        print_warning("All selected interfaces were restored where possible. You might need to reconnect the device.")
         sys.exit(1)
 
     # Success
     print_header("\nOperation completed successfully!")
-    print(f"{Colors.GREEN}Device {selected_device['name']} is now using the new driver{Colors.END}")
+    print(f"{Colors.GREEN}Device {selected_device['name']} interface(s) are now using the new driver{Colors.END}")
 
     # Offer to show new device status
     print("\nVerifying device status...")

wasd-emulator/Makefile

@@ -0,0 +1,25 @@
+
+.PHONY: all
+
+obj-m += wasd.o
+KVER := $(shell uname -r)
+KDIR ?= $(firstword $(wildcard /lib/modules/$(KVER)/build) $(wildcard /usr/lib/modules/$(KVER)/build))
+PWD := $(shell pwd)
+OUT := $(PWD)/out
+
+all:
+	@if [ -z "$(KDIR)" ]; then \
+		echo "ERROR: kernel build dir not found for $(KVER). Install kernel headers (e.g. linux-headers)"; \
+		exit 2; \
+	fi
+	mkdir -p $(OUT)
+	$(MAKE) -C $(KDIR) M=$(PWD) modules
+	-mv -f -- *.ko *.mod.c *.o .*.o *.mod modules.order .*.cmd *.symvers $(OUT)
+
+clean:
+	@if [ -z "$(KDIR)" ]; then \
+		echo "ERROR: kernel build dir not found for $(KVER)."; \
+		exit 2; \
+	fi
+	$(MAKE) -C $(KDIR) M=$(PWD) clean
+	rm -rf $(OUT) *.cmd *.order *.mod *.o

wasd-emulator/wasd.c

@@ -0,0 +1,223 @@
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/input.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+
+#define DRV_NAME "usb_steeringwheel_wasd"
+
+struct wheel_evt {
+    uint32_t buttons_be;
+    uint16_t rot_be;
+    uint8_t gas;
+    uint8_t brk;
+    uint8_t clt;
+    uint8_t gr_x;
+    uint8_t gr_y;
+    uint8_t gr_z;
+};
+
+struct wheel {
+    struct usb_device *udev;
+    struct usb_interface *intf;
+    struct input_dev *input;
+
+    struct urb *irq_urb;
+    struct wheel_evt *irq_data;
+    dma_addr_t irq_dma;
+    int irq_len;
+    int irq_interval;
+    int irq_ep;
+
+    char phys[64];
+    atomic_t opened;
+};
+
+static int drv_open(struct input_dev *dev) {
+    struct wheel *w = input_get_drvdata(dev);
+    if (!w) return -ENODEV;
+    atomic_set(&w->opened, 1);
+    int ret;
+    if ((ret = usb_submit_urb(w->irq_urb, GFP_KERNEL))) {
+        atomic_set(&w->opened, 0);
+        return ret;
+    }
+    return 0;
+}
+
+static void drv_irq(struct urb *urb) {
+    // called every 2ms?
+    struct wheel *w = urb->context;
+    if (!w || !atomic_read(&w->opened))
+        return;
+
+    const int status = urb->status;
+    if (status) {
+        if (status == -ENOENT || status == -ECONNRESET || status == -ESHUTDOWN)
+            return;
+        dev_dbg(&w->intf->dev, "irq urb status %d\n", status);
+        goto resubmit;
+    }
+
+    const struct wheel_evt *data = w->irq_data;
+    const int rot = be16_to_cpu(data->buttons_be);
+    // TODO set keys according to ratio
+    input_report_key(w->input, KEY_W, data->gas <= 0x80);
+    input_report_key(w->input, KEY_S, data->brk <= 0x80);
+    input_report_key(w->input, KEY_A, rot <= 0x6000);
+    input_report_key(w->input, KEY_D, rot >= 0xA000);
+    input_sync(w->input);
+
+resubmit:
+    usb_submit_urb(w->irq_urb, GFP_ATOMIC);
+}
+
+static void drv_close(struct input_dev *dev) {
+    struct wheel *w = input_get_drvdata(dev);
+    if (!w) return;
+    atomic_set(&w->opened, 0);
+    usb_kill_urb(w->irq_urb);
+}
+
+static int drv_probe(struct usb_interface *intf, const struct usb_device_id *id) {
+    struct usb_device *udev = interface_to_usbdev(intf);
+    int ret;
+
+    // Logitech G29
+    //if (le16_to_cpu(udev->descriptor.idVendor) != 0x046d || le16_to_cpu(udev->descriptor.idProduct) != 0xc24f)
+    //    return -ENODEV;
+
+    struct usb_endpoint_descriptor *ep = NULL;
+    const struct usb_host_interface *alts = intf->cur_altsetting;
+    for (int i = 0; i < alts->desc.bNumEndpoints; i++) {
+        struct usb_endpoint_descriptor *d = &alts->endpoint[i].desc;
+        if (usb_endpoint_is_int_in(d)) {
+            ep = d;
+            break;
+        }
+    }
+    if (!ep) return -ENODEV;
+
+    struct wheel *w;
+    if ((w = kzalloc(sizeof(*w), GFP_KERNEL)) == NULL)
+        return -ENOMEM;
+
+    w->udev = usb_get_dev(udev);
+    w->intf = intf;
+    atomic_set(&w->opened, 0);
+
+    w->irq_ep = usb_endpoint_num(ep);
+    w->irq_len = usb_endpoint_maxp(ep);
+    w->irq_interval = ep->bInterval;
+
+    if ((w->irq_urb = usb_alloc_urb(0, GFP_KERNEL)) == NULL) {
+        ret = -ENOMEM;
+        goto err_free;
+    }
+
+    if ((w->irq_data = usb_alloc_coherent(udev, w->irq_len, GFP_KERNEL, &w->irq_dma)) == NULL) {
+        ret = -ENOMEM;
+        goto err_free_urb;
+    }
+
+    if ((w->input = input_allocate_device()) == NULL) {
+        ret = -ENOMEM;
+        goto err_free_buf;
+    }
+
+    usb_make_path(udev, w->phys, sizeof(w->phys));
+    strlcat(w->phys, "/input0", sizeof(w->phys));
+
+    w->input->name = "USB Boot Mouse (example driver)";
+    w->input->phys = w->phys;
+    usb_to_input_id(udev, &w->input->id);
+    w->input->dev.parent = &intf->dev;
+
+    w->input->open = drv_open;
+    w->input->close = drv_close;
+
+    input_set_drvdata(w->input, w);
+
+    usb_fill_int_urb(
+        w->irq_urb,
+        udev,
+        usb_rcvintpipe(udev, ep->bEndpointAddress),
+        w->irq_data,
+        w->irq_len,
+        drv_irq,
+        w,
+        w->irq_interval);
+
+    w->irq_urb->transfer_dma = w->irq_dma;
+    w->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+    usb_set_intfdata(intf, w);
+
+    if ((ret = input_register_device(w->input)) != 0)
+        goto err_clear_intfdata;
+
+    dev_info(&intf->dev,
+        "bound to %04x:%04x, int-in ep 0x%02x maxp %u interval %u\n",
+        le16_to_cpu(udev->descriptor.idVendor),
+        le16_to_cpu(udev->descriptor.idProduct),
+        ep->bEndpointAddress,
+        w->irq_len,
+        w->irq_interval);
+
+    return 0;
+
+err_clear_intfdata:
+    usb_set_intfdata(intf, NULL);
+    input_free_device(w->input);
+    w->input = NULL;
+err_free_buf:
+    usb_free_coherent(udev, w->irq_len, w->irq_data, w->irq_dma);
+err_free_urb:
+    usb_free_urb(w->irq_urb);
+err_free:
+    usb_put_dev(w->udev);
+    kfree(w);
+    return ret;
+}
+
+static void drv_disconnect(struct usb_interface *intf) {
+    struct wheel *w = usb_get_intfdata(intf);
+    usb_set_intfdata(intf, NULL);
+    if (!w) return;
+
+    if (w->input) {
+        input_unregister_device(w->input);
+        w->input = NULL;
+    }
+
+    usb_kill_urb(w->irq_urb);
+    usb_free_coherent(w->udev, w->irq_len, w->irq_data, w->irq_dma);
+    usb_free_urb(w->irq_urb);
+    usb_put_dev(w->udev);
+    kfree(w);
+
+    dev_info(&intf->dev, "disconnected\n");
+}
+
+static const struct usb_device_id drv_id_table[] = {
+    { USB_DEVICE_INTERFACE_NUMBER(0x046d, 0xc24f, 0) },
+    { USB_INTERFACE_INFO(3, 1, 1) },
+    {}
+};
+MODULE_DEVICE_TABLE(usb, drv_id_table);
+
+static struct usb_driver drv = {
+    .name = DRV_NAME,
+    .probe = drv_probe,
+    .disconnect = drv_disconnect,
+    .id_table = drv_id_table,
+};
+
+module_usb_driver(drv);
+
+MODULE_AUTHOR("Lorenz Stechauner");
+MODULE_DESCRIPTION("Steering wheel WASD emulator");
+MODULE_LICENSE("GPL");