0.1.2

AGENTS.md

@@ -10,10 +10,10 @@ live in the daemon, not the GUI. Code is split across `src/` (GUI), `shared/`
 ## Build / run / verify
 - `make` — builds the `gkeymapper` GUI, the `gkeymapper-daemon` and the `.mo`
   catalogs. Needs `g++` (C++17), `make`, `gettext`, `libgtk-4-dev`,
-  `libusb-1.0-0-dev`, `libxkbcommon-dev` and `libglib2.0-dev` (see README for
+  `libxkbcommon-dev` and `libglib2.0-dev` (see README for
   `apt install` on a fresh machine). `libglib2.0-dev` also provides
   `glib-compile-resources`, which generates the icons embedded into the GUI.
-- `make daemon` — builds only `gkeymapper-daemon` (needs libusb, xkbcommon and
+- `make daemon` — builds only `gkeymapper-daemon` (needs xkbcommon and
   gio-2.0, not GTK).
 - `make translations` — only runs `msgfmt` on the existing `.po` files.
 - `make run` — builds, then runs with `GKEYMAPPER_LOCALEDIR=$PWD/locale` and
@@ -66,11 +66,9 @@ live in the daemon, not the GUI. Code is split across `src/` (GUI), `shared/`
   `optionsdialog` and `popovers` (the popup input grab, see below).
 - The Makefile globs sources: `make` builds the GUI (`src/*.cpp` + `shared/*.cpp`
   + the generated `build/gresources.c`, see Assets) **and** the daemon
-  (`daemon/*.cpp` + `shared/*.cpp`, needs `libusb-1.0-0-dev`,
-  `libxkbcommon-dev` and `libglib2.0-dev`). `make daemon` builds only the daemon.
+  (`daemon/*.cpp` + `shared/*.cpp`, needs `libxkbcommon-dev` and `libglib2.0-dev`). `make daemon` builds only the daemon.
 - The daemon is split into: `device_tables` (raw HID report tables per model plus
-  `decode_gkey_state`, the report → pressed-bitmap decoder), `g910_device` (libusb
-  open/detach/claim/read), `uinput_keyboard` (virtual keyboard), `action`
+  `decode_gkey_state`, the report → pressed-bitmap decoder), `g910_device` (hidraw open/read/close), `uinput_keyboard` (virtual keyboard), `action`
   (dispatch `key`/`command`/`disabled`/`keyhold`), `config_watch` (inotify auto-reload of
   the mappings file) and `ipc_dbus` (the GDBus service). `shared/keymap` does the
   layout lookups for both sides. The hot path never touches the GUI: D-Bus is
@@ -100,7 +98,7 @@ live in the daemon, not the GUI. Code is split across `src/` (GUI), `shared/`
   2 s while D-Bus and the config watch keep running. Never make it exit on a
   missing device — that would drop the bus name and make the GUI look like the
   daemon died. `GKeyDevice::open(quiet)` exists so those retries stay out of the
-  journal (libusb-level errors always log).
+  journal (hidraw-level errors always log).
 - `make install` (PREFIX default `/usr/local`) also installs the packaging
   files from `data/`: the udev rule, the `modules-load.d` fragment, the
   systemd **user** unit and the D-Bus activation file. Both contain an
@@ -389,9 +387,9 @@ over any installed file; the file lookup remains only as a safety net.
     families, which must *not* decode as media keys (see the bit table above);
   - build the daemon with a **fake** `GKeyDevice`: keep the header, script
     `open()`/`read_report()`, link `daemon/*.cpp` **without** `g910_device.cpp`
-    and without libusb. That runs the real loop, so it covers "no keyboard at
+    and without g910_device.cpp. That runs the real loop, so it covers "no keyboard at
     start", "device lost" and the reopen, emits real D-Bus signals and never
-    claims the real device — nothing touches the keyboard and no key is injected
+    opens the real device — nothing touches the keyboard and no key is injected
     into the focused window. Use a config with `command:` mappings only (a helper
     script that dumps its environment is also how you check that a `command`
     action sees `DISPLAY`); with `key:` mappings the fake would inject keys into
@@ -401,7 +399,7 @@ over any installed file; the file lookup remains only as a safety net.
       the fake `g910_device.h` in an include directory. `#include "g910_device.h"`
       searches the *including file's* directory first, so compiling the real
       `daemon/main.cpp` would always pick up the real header (its inline
-      `is_open()` needs libusb).
+      `is_open()` needs hidraw).
     - **Give the fake its own session bus** (`dbus-daemon --session --address=
       unix:path=/tmp/…/fake_bus --fork --print-pid=1`, then
       `DBUS_SESSION_BUS_ADDRESS=unix:path=…` for the fake). Otherwise it refuses

Makefile

@@ -1,7 +1,7 @@
 # gKeyMapper - Build
 # Dependencies: g++, pkg-config, gettext (msgfmt, for the translations),
-#               libgtk-4-dev, libusb-1.0-0-dev, libxkbcommon-dev
-# Installation: sudo apt install build-essential gettext libgtk-4-dev libusb-1.0-0-dev libxkbcommon-dev
+#               libgtk-4-dev, libxkbcommon-dev
+# Installation: sudo apt install build-essential gettext libgtk-4-dev libxkbcommon-dev
 
 CXX ?= g++
 CXXFLAGS ?= -std=c++17 -O2 -Wall -Wextra -Wpedantic
@@ -11,8 +11,6 @@ GLIB_COMPILE_RESOURCES ?= glib-compile-resources
 
 GTK_CFLAGS := $(shell $(PKG_CONFIG) --cflags gtk4)
 GTK_LIBS   := $(shell $(PKG_CONFIG) --libs gtk4)
-USB_CFLAGS := $(shell $(PKG_CONFIG) --cflags libusb-1.0)
-USB_LIBS   := $(shell $(PKG_CONFIG) --libs libusb-1.0)
 XKB_CFLAGS := $(shell $(PKG_CONFIG) --cflags xkbcommon)
 XKB_LIBS   := $(shell $(PKG_CONFIG) --libs xkbcommon)
 GIO_CFLAGS := $(shell $(PKG_CONFIG) --cflags gio-2.0)
@@ -32,7 +30,7 @@ DAEMON_HEADERS := $(wildcard $(DAEMON_DIR)/*.h) $(wildcard $(SHARED_DIR)/*.h)
 GUI_RES        := build/gresources.c
 GUI_RES_SRC    := data/icons.gresource.xml
 PREFIX     ?= /usr/local
-DEB_VERSION ?= 0.1.1
+DEB_VERSION ?= 0.1.2
 DEB_ARCH    := $(shell dpkg --print-architecture 2>/dev/null || echo amd64)
 BINDIR     := $(PREFIX)/bin
 LOCALEDIR  := $(PREFIX)/share/locale
@@ -70,7 +68,7 @@ $(TARGET): $(GUI_SOURCES) $(GUI_HEADERS) $(GUI_RES)
 daemon: $(DAEMON)
 
 $(DAEMON): $(DAEMON_SOURCES) $(DAEMON_HEADERS)
-	$(CXX) $(CXXFLAGS) $(USB_CFLAGS) $(XKB_CFLAGS) $(GIO_CFLAGS) -o $@ $(DAEMON_SOURCES) $(USB_LIBS) $(XKB_LIBS) $(GIO_LIBS)
+	$(CXX) $(CXXFLAGS) $(XKB_CFLAGS) $(GIO_CFLAGS) -o $@ $(DAEMON_SOURCES) $(XKB_LIBS) $(GIO_LIBS)
 
 translations: $(MO_FILES)
 

README.md

@@ -3,7 +3,6 @@
 ![C++17](https://img.shields.io/badge/C%2B%2B-17-00599C?logo=cplusplus&logoColor=white)
 ![GTK 4](https://img.shields.io/badge/GTK-4-7FE719?logo=gtk&logoColor=black)
 ![GLib/GIO](https://img.shields.io/badge/GLib%2FGIO-D--Bus-4A86CF)
-![libusb](https://img.shields.io/badge/libusb-1.0-c8a200)
 ![xkbcommon](https://img.shields.io/badge/xkbcommon-layout--aware-6E4C13)
 ![i18n](https://img.shields.io/badge/i18n-de%20%7C%20en%20%7C%20es%20%7C%20fr-blueviolet)
 ![systemd](https://img.shields.io/badge/systemd-user%20service-30D475?logo=systemd&logoColor=white)
@@ -32,7 +31,6 @@ Documentation and source comments are written in English.
 - pkg-config
 - gettext (for translations, `msgfmt`)
 - GTK 4 development files
-- libusb 1.0 development files (for the daemon)
 - libxkbcommon development files (for the daemon's layout handling)
 - GLib/GIO development files (for the GUI ↔ daemon D-Bus channel; `libgtk-4-dev`
   already pulls them in, but they are needed for `make daemon` on its own)
@@ -41,11 +39,11 @@ Documentation and source comments are written in English.
 
 ```bash
 sudo apt update
-sudo apt install -y build-essential gettext libgtk-4-dev libusb-1.0-0-dev libxkbcommon-dev libglib2.0-dev
+sudo apt install -y build-essential gettext libgtk-4-dev libxkbcommon-dev libglib2.0-dev
 ```
 
-Afterwards `pkg-config --modversion gtk4`, `pkg-config --modversion libusb-1.0`
-and `pkg-config --modversion gio-2.0` should print versions.
+Afterwards `pkg-config --modversion gtk4` and `pkg-config --modversion xkbcommon`
+should print versions.
 
 ## Setting up the project
 
@@ -181,7 +179,8 @@ The daemon reads G1–G9 from the keyboard and replays the configured action
 ./gkeymapper-daemon /path/to.conf   # or an explicit file
 ```
 
-- It reaches the keyboard through libusb (raw USB HID, vendor interface 1) and
+- It reads the keyboard's vendor interface through the kernel's hidraw
+  interface (interface 1) and
   creates a virtual keyboard via `/dev/uinput`. Both need access for your user;
   `make install` ships a udev rule (`TAG+="uaccess"`) for that. On Linux Mint the
   device already has such an ACL, otherwise install the rule or add your user to
@@ -391,7 +390,7 @@ shared/keymap.{h,cpp}  # layout-aware key lookups (xkbcommon), GUI + daemon
 shared/ipc_ids.h       # app id + D-Bus names shared by GUI and daemon
 daemon/main.cpp        # event loop: read G-keys, run the action
 daemon/device_tables.{h,cpp}  # per-model raw HID report tables (G910)
-daemon/g910_device.{h,cpp}    # libusb access to the vendor interface
+daemon/g910_device.{h,cpp}    # hidraw access to the vendor interface
 daemon/uinput_keyboard.{h,cpp}# virtual keyboard for "key" mappings
 daemon/action.{h,cpp}  # dispatch "key" / "command" / "disabled" / "keyhold"
 daemon/config_watch.{h,cpp}   # inotify watch on mappings.conf (auto-reload)

daemon/g910_device.cpp

@@ -1,14 +1,21 @@
-// gKeyMapper daemon - raw USB HID access to the keyboard's vendor interface.
+// gKeyMapper daemon - raw HID access to the keyboard's vendor interface.
+//
+// Uses the kernel's hidraw interface instead of libusb.  hidraw provides
+// non-exclusive access: the kernel driver (usbhid) stays attached, and other
+// tools (OpenRGB, etc.) can open the same device at the same time.  This
+// avoids the exclusive claim that blocked OpenRGB from detecting the keyboard.
 
 #include "g910_device.h"
 
 #include <cstdio>
-
-// libusb.h uses zero-length arrays, which -Wpedantic flags.
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wpedantic"
-#include <libusb.h>
-#pragma GCC diagnostic pop
+#include <cstdlib>
+#include <cstring>
+#include <cerrno>
+#include <fcntl.h>
+#include <unistd.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <linux/hidraw.h>
 
 namespace gkeymapper::daemon {
 
@@ -16,108 +23,106 @@ GKeyDevice::~GKeyDevice() {
     close();
 }
 
+// Scan /sys/class/hidraw for a node whose HID_ID matches vendor:product and
+// whose sysfs path points at interface 1 (the vendor-specific one).  Returns
+// the minor number (>= 0) or -1.
+int GKeyDevice::find_hidraw_node(uint16_t vendor, uint16_t product) {
+    char id_str[64];
+    std::snprintf(id_str, sizeof(id_str), "0003:%08X:%08X", (unsigned)vendor, (unsigned)product);
+
+    for (int i = 0; i < 64; ++i) {
+        char path[512];
+        std::snprintf(path, sizeof(path), "/sys/class/hidraw/hidraw%d/device/uevent", i);
+        FILE* f = std::fopen(path, "r");
+        if (!f) {
+            continue;
+        }
+        char buf[2048];
+        size_t n = std::fread(buf, 1, sizeof(buf) - 1, f);
+        std::fclose(f);
+        buf[n] = '\0';
+
+        // Check HID_ID matches our vendor:product.
+        if (std::strstr(buf, id_str) == nullptr) {
+            continue;
+        }
+
+        // Check the sysfs path contains ":1." (interface 1, the vendor one).
+        // The readlink gives us the full device path.
+        char linkpath[512];
+        std::snprintf(linkpath, sizeof(linkpath), "/sys/class/hidraw/hidraw%d", i);
+        char resolved[1024];
+        ssize_t rlen = readlink(linkpath, resolved, sizeof(resolved) - 1);
+        if (rlen < 0) {
+            continue;
+        }
+        resolved[rlen] = '\0';
+
+        // The resolved path contains the interface number in the form
+        // <device>:<config>.<interface>.  Interface 1 (vendor-specific) has
+        // config 1, so the path contains ":1.1" (altsetting 1) or ":1.0".
+        // We check the uevent's HID_PHYS instead, which contains "input1"
+        // for interface 1 and "input0" for interface 0.
+        if (std::strstr(buf, "input1") == nullptr) {
+            continue;
+        }
+
+        return i;
+    }
+    return -1;
+}
+
 bool GKeyDevice::open(bool quiet) {
-    if (handle_) {
+    if (fd_ >= 0) {
         return true;
     }
 
-    if (libusb_init(&context_) != 0) {
-        std::fprintf(stderr, "gkeymapper-daemon: libusb_init failed\n");
-        return false;
-    }
+    // Find a supported profile first (by vendor/product).
+    // We iterate all profiles and try to find a matching hidraw node.
+    const auto& profs = profiles();
+    const DeviceProfile* matched = nullptr;
+    int node = -1;
 
-    libusb_device** devices = nullptr;
-    ssize_t count = libusb_get_device_list(context_, &devices);
-    if (count < 0) {
-        std::fprintf(stderr, "gkeymapper-daemon: no USB devices\n");
-        close();
-        return false;
-    }
-
-    libusb_device* target = nullptr;
-    for (ssize_t i = 0; i < count && !target; ++i) {
-        libusb_device_descriptor desc{};
-        if (libusb_get_device_descriptor(devices[i], &desc) != 0) {
-            continue;
-        }
-        if (find_profile(desc.idVendor, desc.idProduct) != nullptr) {
-            target = devices[i];
-            profile_ = find_profile(desc.idVendor, desc.idProduct);
+    for (const DeviceProfile& p : profs) {
+        node = find_hidraw_node(p.vendor, p.product);
+        if (node >= 0) {
+            matched = &p;
+            break;
         }
     }
 
-    if (!target) {
+    if (!matched || node < 0) {
         if (!quiet) {
             std::fprintf(stderr, "gkeymapper-daemon: no supported keyboard found\n");
         }
-        libusb_free_device_list(devices, 1);
-        close();
         return false;
     }
+    profile_ = matched;
 
-    if (libusb_open(target, &handle_) != 0) {
+    char devpath[64];
+    std::snprintf(devpath, sizeof(devpath), "/dev/hidraw%d", node);
+
+    fd_ = ::open(devpath, O_RDWR | O_NONBLOCK);
+    if (fd_ < 0) {
         if (!quiet) {
-            std::fprintf(stderr, "gkeymapper-daemon: could not open %s (permissions?)\n",
-                         profile_->name);
+            std::fprintf(stderr, "gkeymapper-daemon: could not open %s (%s)\n",
+                         devpath, std::strerror(errno));
         }
-        libusb_free_device_list(devices, 1);
-        close();
-        return false;
-    }
-    libusb_free_device_list(devices, 1);
-
-    if (!find_endpoint()) {
-        close();
+        profile_ = nullptr;
         return false;
     }
 
-    // Detach and claim the vendor interface, like the reference driver.
-    if (libusb_kernel_driver_active(handle_, profile_->interfaceNumber) == 1) {
-        if (libusb_detach_kernel_driver(handle_, profile_->interfaceNumber) == 0) {
-            detached_kernel_driver_ = true;
-        }
-    }
-    if (libusb_claim_interface(handle_, profile_->interfaceNumber) != 0) {
-        if (!quiet) {
-            std::fprintf(stderr, "gkeymapper-daemon: could not claim interface %d\n",
-                         profile_->interfaceNumber);
-        }
-        close();
-        return false;
-    }
-    claimed_interface_ = profile_->interfaceNumber;
+    // Disable the default G-key binding (G-keys mapped to F-keys) if needed.
+    // Done after open so disable_binding() can use the fd.
+    // (disable_binding is called separately by main.cpp)
 
-    std::fprintf(stderr, "gkeymapper-daemon: %s found (endpoint 0x%02x)\n",
-                 profile_->name, endpoint_);
+    std::fprintf(stderr, "gkeymapper-daemon: %s found (hidraw%d)\n",
+                 profile_->name, node);
     return true;
 }
 
-bool GKeyDevice::find_endpoint() {
-    libusb_device* device = libusb_get_device(handle_);
-    libusb_config_descriptor* config = nullptr;
-    if (libusb_get_config_descriptor(device, profile_->configuration, &config) != 0) {
-        return false;
-    }
-
-    bool found = false;
-    for (int i = 0; i < config->bNumInterfaces && !found; ++i) {
-        const libusb_interface& iface = config->interface[i];
-        for (int a = 0; a < iface.num_altsetting && !found; ++a) {
-            const libusb_interface_descriptor& desc = iface.altsetting[a];
-            if (desc.bInterfaceNumber == profile_->interfaceNumber &&
-                desc.bAlternateSetting == profile_->altSetting &&
-                desc.bNumEndpoints > 0) {
-                endpoint_ = desc.endpoint[0].bEndpointAddress;
-                found = true;
-            }
-        }
-    }
-    libusb_free_config_descriptor(config);
-    return found;
-}
-
 bool GKeyDevice::disable_binding() {
-    if (!handle_ || !profile_) {
+    if (fd_ < 0 || !profile_) {
         return false;
     }
     if (!profile_->disableBinding) {
@@ -125,19 +130,20 @@ bool GKeyDevice::disable_binding() {
     }
 
     for (const Report& command : profile_->disableCommands) {
-        int written = libusb_control_transfer(handle_, 0x21, 0x09, 0x0212,
-                                              profile_->interfaceNumber,
-                                              const_cast<unsigned char*>(command.data()),
-                                              static_cast<uint16_t>(command.size()),
-                                              1000);
-        if (written < 0) {
-            std::fprintf(stderr, "gkeymapper-daemon: disable-binding write failed (%d)\n",
-                         written);
+        // HID SET_REPORT (feature report).  The first byte of the command
+        // is the report ID.
+        int len = static_cast<int>(command.size());
+        // HIDIOCSFEATURE takes a buffer where byte 0 is the report ID.
+        std::vector<uint8_t> buf(command.begin(), command.end());
+        int rc = ioctl(fd_, HIDIOCSFEATURE(len), buf.data());
+        if (rc < 0) {
+            std::fprintf(stderr, "gkeymapper-daemon: disable-binding ioctl failed (%s)\n",
+                         std::strerror(errno));
             return false;
         }
     }
 
-    // Drain the confirmation reports so they do not show up as key events.
+    // Drain confirmation reports.
     uint8_t scratch[64];
     for (int i = 0; i < 6; ++i) {
         if (read_report(scratch, sizeof(scratch), 200) <= 0) {
@@ -148,38 +154,44 @@ bool GKeyDevice::disable_binding() {
 }
 
 int GKeyDevice::read_report(uint8_t* buffer, int length, int timeoutMs) {
-    if (!handle_) {
+    if (fd_ < 0) {
         return -1;
     }
-    int transferred = 0;
-    int rc = libusb_interrupt_transfer(handle_, endpoint_, buffer, length,
-                                       &transferred, timeoutMs);
-    if (rc == 0) {
-        return transferred;
-    }
-    if (rc == LIBUSB_ERROR_TIMEOUT) {
+
+    struct pollfd pfd;
+    pfd.fd = fd_;
+    pfd.events = POLLIN;
+    pfd.revents = 0;
+
+    int rc = poll(&pfd, 1, timeoutMs);
+    if (rc < 0) {
+        if (errno == EINTR) {
             return 0;
         }
-    return rc; // negative
+        return -1;
+    }
+    if (rc == 0) {
+        return 0; // timeout
+    }
+    if (!(pfd.revents & POLLIN)) {
+        return 0;
+    }
+
+    ssize_t n = ::read(fd_, buffer, length);
+    if (n < 0) {
+        if (errno == EAGAIN || errno == EWOULDBLOCK) {
+            return 0;
+        }
+        return -1;
+    }
+    return static_cast<int>(n);
 }
 
 void GKeyDevice::close() {
-    if (handle_) {
-        if (claimed_interface_ >= 0) {
-            libusb_release_interface(handle_, claimed_interface_);
+    if (fd_ >= 0) {
+        ::close(fd_);
     }
-        if (detached_kernel_driver_) {
-            libusb_attach_kernel_driver(handle_, profile_->interfaceNumber);
-        }
-        libusb_close(handle_);
-    }
-    handle_ = nullptr;
-    if (context_) {
-        libusb_exit(context_);
-        context_ = nullptr;
-    }
-    claimed_interface_ = -1;
-    detached_kernel_driver_ = false;
+    fd_ = -1;
     profile_ = nullptr;
 }
 

daemon/g910_device.h

@@ -1,4 +1,8 @@
-// gKeyMapper daemon - raw USB HID access to the keyboard's vendor interface.
+// gKeyMapper daemon - raw HID access to the keyboard's vendor interface.
+//
+// Uses the kernel's hidraw interface instead of libusb: hidraw provides
+// non-exclusive access, so other tools (OpenRGB, etc.) can talk to the same
+// device at the same time.  The kernel driver (usbhid) stays attached.
 #ifndef GKEYMAPPER_DAEMON_GKEY_DEVICE_H
 #define GKEYMAPPER_DAEMON_GKEY_DEVICE_H
 
@@ -6,9 +10,6 @@
 
 #include "device_tables.h"
 
-struct libusb_context;
-struct libusb_device_handle;
-
 namespace gkeymapper::daemon {
 
 class GKeyDevice {
@@ -19,15 +20,15 @@ public:
     GKeyDevice(const GKeyDevice&) = delete;
     GKeyDevice& operator=(const GKeyDevice&) = delete;
 
-    // Finds a supported keyboard, opens it and detaches the kernel driver from
-    // the vendor interface. Returns false (and logs) if none is found.
+    // Finds a supported keyboard and opens its hidraw node. Returns false (and
+    // logs) if none is found.
     //
     // `quiet` silences the "cannot use the keyboard" lines only, which the
     // hot-plug retry uses so an unplugged keyboard does not flood the journal
-    // with one line every retry; libusb-level failures always log.
+    // with one line every retry.
     bool open(bool quiet = false);
     void close();
-    bool is_open() const { return handle_ != nullptr; }
+    bool is_open() const { return fd_ >= 0; }
 
     // Sends the "stop mapping G-keys to F-keys" command if the model needs it.
     bool disable_binding();
@@ -39,14 +40,10 @@ public:
     const DeviceProfile* profile() const { return profile_; }
 
 private:
-    bool find_endpoint();
+    int find_hidraw_node(uint16_t vendor, uint16_t product);
 
-    libusb_context* context_ = nullptr;
-    libusb_device_handle* handle_ = nullptr;
+    int fd_ = -1;
     const DeviceProfile* profile_ = nullptr;
-    uint8_t endpoint_ = 0;
-    int claimed_interface_ = -1;
-    bool detached_kernel_driver_ = false;
 };
 
 } // namespace gkeymapper::daemon

scripts/make-deb.sh

@@ -3,7 +3,7 @@
 # Usage: scripts/make-deb.sh [version] [arch]
 set -e
 
-VERSION="${1:-0.1.1}"
+VERSION="${1:-0.1.2}"
 ARCH="${2:-$(dpkg --print-architecture 2>/dev/null || echo amd64)}"
 PACKAGE="gkeymapper"
 STAGING="build/deb"
@@ -29,7 +29,7 @@ Section: utils
 Installed-Size: $INSTALLED_SIZE
 Priority: optional
 Architecture: $ARCH
-Depends: libc6, libgtk-4-1, libusb-1.0-0, libxkbcommon0, libglib2.0-0, systemd, udev
+Depends: libc6, libgtk-4-1, libxkbcommon0, libglib2.0-0, systemd, udev
 Maintainer: gKeyMapper <gkeymapper@rager.dev>
 Description: Remap G1-G9 keys of the Logitech G910
  A GTK4 GUI plus a background daemon for remapping the G1-G9 keys
@@ -48,6 +48,32 @@ case "$1" in
             udevadm trigger --subsystem-match=input 2>/dev/null || true
         fi
 
+        # Re-attach the kernel driver to interface 1 if it was detached by an
+        # older (libusb-based) daemon.  Without this the new (hidraw-based)
+        # daemon cannot find /dev/hidraw for interface 1.
+        for _dev in /sys/bus/usb/devices/*; do
+            _vendor=$(cat "$_dev/idVendor" 2>/dev/null) || continue
+            _product=$(cat "$_dev/idProduct" 2>/dev/null) || continue
+            case "$_vendor" in
+                046d)
+                    case "$_product" in
+                        c32b|c335)
+                            for _iface in "$_dev"/*:*; do
+                                case "$_iface" in
+                                    *:1.*)
+                                        _name=$(basename "$_iface")
+                                        if [ -w /sys/bus/usb/drivers/usbhid/bind ]; then
+                                            echo "$_name" > /sys/bus/usb/drivers/usbhid/bind 2>/dev/null || true
+                                        fi
+                                        ;;
+                                esac
+                            done
+                            ;;
+                    esac
+                    ;;
+            esac
+        done
+
         # Helper: run a command as a given user with the D-Bus session bus
         # available.  "systemctl --user" needs DBUS_SESSION_BUS_ADDRESS, which
         # is not set in a plain "su -" login shell.
@@ -95,6 +121,56 @@ EOF
 
 chmod 755 "$STAGING/DEBIAN/postinst"
 
+# prerm: stop the daemon and re-attach the kernel driver before upgrading.
+# The old (libusb-based) daemon detached the kernel driver from interface 1;
+# if it was not stopped gracefully, the driver stays detached and the new
+# (hidraw-based) daemon cannot find the device.
+cat > "$STAGING/DEBIAN/prerm" <<'EOF'
+#!/bin/sh
+set -e
+case "$1" in
+    remove|upgrade|deconfigure)
+        # Stop the daemon if running.
+        if [ -n "$SUDO_USER" ]; then
+            runuser -u "$SUDO_USER" -- systemctl --user stop gkeymapper-daemon >/dev/null 2>&1 || true
+            runuser -u "$SUDO_USER" -- systemctl --user daemon-reload >/dev/null 2>&1 || true
+        else
+            for _user in $(loginctl list-users --no-legend 2>/dev/null | awk '{print $2}'); do
+                runuser -u "$_user" -- systemctl --user stop gkeymapper-daemon >/dev/null 2>&1 || true
+            done
+        fi
+
+        # Re-attach the kernel driver to interface 1 if it was detached by
+        # an older (libusb-based) daemon.  Without this, the new daemon
+        # (hidraw-based) cannot find /dev/hidraw for interface 1.
+        for _dev in /sys/bus/usb/devices/*; do
+            _vendor=$(cat "$_dev/idVendor" 2>/dev/null) || continue
+            _product=$(cat "$_dev/idProduct" 2>/dev/null) || continue
+            case "$_vendor" in
+                046d)
+                    case "$_product" in
+                        c32b|c335)
+                            for _iface in "$_dev"/*:*; do
+                                case "$_iface" in
+                                    *:1.*)
+                                        _name=$(basename "$_iface")
+                                        if [ -w /sys/bus/usb/drivers/usbhid/bind ]; then
+                                            echo "$_name" > /sys/bus/usb/drivers/usbhid/bind 2>/dev/null || true
+                                        fi
+                                        ;;
+                                esac
+                            done
+                            ;;
+                    esac
+                    ;;
+            esac
+        done
+        ;;
+esac
+exit 0
+EOF
+chmod 755 "$STAGING/DEBIAN/prerm"
+
 # postrm: disable the user daemon on removal.
 cat > "$STAGING/DEBIAN/postrm" <<'EOF'
 #!/bin/sh

shared/ipc_ids.h

@@ -13,7 +13,7 @@ namespace gkeymapper::ipc {
 inline constexpr const char* kAppId = "dev.rager.gkeymapper";
 
 // Reported by GetStatus and shown in the About dialog.
-inline constexpr const char* kVersion = "0.1.1";
+inline constexpr const char* kVersion = "0.1.2";
 
 // The daemon owns this name; the GUI talks to it via the object below.
 //