Auto-generate udev-rules

Also fix cmake version warning

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.6.2)
+cmake_minimum_required(VERSION 2.8...3.19)
 project(headsetcontrol)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules/")
@@ -115,7 +115,17 @@ install(TARGETS headsetcontrol DESTINATION bin)
 
 # install udev files on linux
 if(UNIX AND NOT APPLE)
-    install(DIRECTORY udev/ DESTINATION /etc/udev/rules.d)
+    set (program_cmd headsetcontrol)
+    set (program_arg "-u")
+    set (program_output "/etc/udev/rules.d/70-headsets.rules")
+    install( CODE
+	            "
+    execute_process(COMMAND ${program_cmd} ${program_arg}
+      OUTPUT_FILE ${program_output})
+
+    message(STATUS \"Installed udev rules to ${program_output}\")
+	    "
+    )
 endif()
 
 

README.md

@@ -114,7 +114,7 @@ This will copy the binary to a folder globally accessible via path.
 
 ### Access without root
 
-Also in Linux, you need udev rules if you don't want to start the application with root. Those rules reside in the udev folder of this repository. Typing `make install` on Linux copies them automatically to /etc/udev/rules.d/.
+Also in Linux, you need udev rules if you don't want to start the application with root. Those rules are generated via `headsetcontrol -u`. Typing `make install` on Linux generates and writes them automatically to /etc/udev/rules.d/.
 
 You can reload udev configuration without reboot via `sudo udevadm control --reload-rules && sudo udevadm trigger`
 
@@ -123,7 +123,7 @@ You can reload udev configuration without reboot via `sudo udevadm control --rel
 Type `headsetcontrol -h` to get all available options.\
 (Don't forget to prefix it with `./` when the application resides in the current folder)
 
-Type `headsetcontrol -?` to get a list of supported capabilities for the currently detected headset
+Type `headsetcontrol -?` to get a list of supported capabilities for the currently detected headset.
 
 `headsetcontrol -s 128` sets the sidetone to 128 (REAL loud). You can silence it with `0`. I recommend a loudness of 16.
 
@@ -141,6 +141,8 @@ Following options don't work on all devices yet:
 
 `headsetcontrol -m` retrieves the current chat-mix-dial level setting.
 
+`headsetcontrol -u` Generates and outputs udev-rules for Linux.
+
 ### Third Party
 
 The following additional software can be used to enable control via a GUI

src/device_registry.c

@@ -57,3 +57,13 @@ int get_device(struct device* device_found, uint16_t idVendor, uint16_t idProduc
     }
     return 1;
 }
+
+int iterate_devices(int index, struct device** device_found)
+{
+    if (index < NUMDEVICES) {
+        *device_found = devicelist[index];
+        return 0;
+    } else {
+        return -1;
+    }
+}

src/device_registry.h

@@ -17,3 +17,13 @@ void init_devices();
  *  @return 0 when a device was found, 1 otherwise
  */
 int get_device(struct device* device_found, uint16_t idVendor, uint16_t idProduct);
+
+/** @brief Gives back an device at the given index
+ *
+ *  Caller must iterate from index 0 upwards until returned -1 to get all devices
+ *
+ *  @param index Current index
+ *  @param device_found output parameter, pointer to device pointer
+ *  @return 0 when a device exists at the given index, -1 if not
+ */
+int iterate_devices(int index, struct device** device_found);

src/main.c

@@ -186,6 +186,27 @@ static void print_capability(enum capabilities cap, char shortName, const char*
     }
 }
 
+static void print_udevrules()
+{
+    int i = 0;
+    struct device* device_found;
+
+    printf("ACTION!=\"add|change\", GOTO=\"headset_end\"\n");
+    printf("\n");
+
+    while (iterate_devices(i++, &device_found) == 0) {
+        printf("# %s\n", device_found->device_name);
+
+        for (int i = 0; i < device_found->numIdProducts; i++)
+            printf("KERNEL==\"hidraw*\", SUBSYSTEM==\"hidraw\", ATTRS{idVendor}==\"%04x\", ATTRS{idProduct}==\"%04x\", TAG+=\"uaccess\"\n",
+                (unsigned int)device_found->idVendor, (unsigned int)device_found->idProductsSupported[i]);
+
+        printf("\n");
+    }
+
+    printf("LABEL=\"headset_end\"\n");
+}
+
 int main(int argc, char* argv[])
 {
     int c;
@@ -200,7 +221,10 @@ int main(int argc, char* argv[])
     long rotate_to_mute = -1;
     long print_capabilities = -1;
 
-    while ((c = getopt(argc, argv, "bchs:n:l:i:mv:r:?")) != -1) {
+    // Init all information of supported devices
+    init_devices();
+
+    while ((c = getopt(argc, argv, "bchs:n:l:i:mv:r:u?")) != -1) {
         switch (c) {
         case 'b':
             request_battery = 1;
@@ -256,6 +280,10 @@ int main(int argc, char* argv[])
                 return 1;
             }
             break;
+        case 'u':
+            fprintf(stderr, "Outputting udev rules to stdout/console...\n\n");
+            print_udevrules();
+            return 0;
         case '?':
             print_capabilities = 1;
             break;
@@ -271,6 +299,8 @@ int main(int argc, char* argv[])
             printf("  -m\t\tRetrieves the current chat-mix-dial level setting\n");
             printf("  -v 0|1\tTurn voice prompts on or off (0 = off, 1 = on)\n");
             printf("  -r 0|1\tTurn rotate to mute feature on or off (0 = off, 1 = on)\n");
+            printf("\n");
+            printf("  -u\t\tOutputs udev rules to stdout/console\n");
 
             printf("\n");
             return 0;
@@ -285,9 +315,6 @@ int main(int argc, char* argv[])
             printf("Non-option argument %s\n", argv[index]);
     }
 
-    // Init all information of supported devices
-    init_devices();
-
     // Look for a supported device
     int headset_available = find_device();
     if (headset_available != 0) {