Add map function to create controller mappings

docs/README.pod

@@ -31,6 +31,10 @@ List all available games and application on host.
 
 Quit the current running game or application on host.
 
+=item B<map> 
+ 
+Create a mapping for the specified I<INPUT> device.
+
 =item B<help>
 
 Show help for all available commands.

src/input/evdev.c

@@ -84,6 +84,8 @@ static int numDevices = 0;
 static int assignedControllerIds = 0;
 
 static short* currentKey;
+static short* currentHat;
+static short* currentHatDir;
 static short* currentAbs;
 static bool* currentReverse;
 
@@ -366,28 +368,42 @@ static bool evdev_handle_event(struct input_event *ev, struct input_device *dev)
 }
 
 static bool evdev_handle_mapping_event(struct input_event *ev, struct input_device *dev) {
+  int index, hat_index;
   switch (ev->type) {
   case EV_KEY:
+    index = ev->code > BTN_MISC && ev->code < (BTN_MISC + KEY_MAX) ? dev->key_map[ev->code - BTN_MISC] : -1;
     if (currentKey != NULL) {
       if (ev->value)
-        *currentKey = ev->code;
-      else if (ev->code == *currentKey)
+        *currentKey = index;
+      else if (*currentKey != -1 && index == *currentKey)
         return false;
     }
     break;
   case EV_ABS:
+    hat_index = (ev->code - ABS_HAT0X) / 2;
+    if (hat_index >= 0 && hat_index < 4) {
+      int hat_dir_index = (ev->code - ABS_HAT0X) % 2;
+      dev->hats_state[hat_index][hat_dir_index] = ev->value < 0 ? -1 : (ev->value == 0 ? 0 : 1);
+    }
     if (currentAbs != NULL) {
       struct input_abs_parms parms;
       evdev_init_parms(dev, &parms, ev->code);
 
+      printf("%d: %d >< %d / %d\n", ev->code, ev->value, parms.avg + parms.range/2, parms.avg - parms.range/2);
       if (ev->value > parms.avg + parms.range/2) {
-        *currentAbs = ev->code;
+        *currentAbs = dev->abs_map[ev->code];
         *currentReverse = false;
       } else if (ev->value < parms.avg - parms.range/2) {
-        *currentAbs = ev->code;
+        *currentAbs = dev->abs_map[ev->code];
         *currentReverse = true;
       } else if (ev->code == *currentAbs)
         return false;
+    } else if (currentHat != NULL) {
+      if (hat_index >= 0 && hat_index < 4) {
+        *currentHat = hat_index;
+        *currentHatDir = hat_constants[dev->hats_state[hat_index][1] + 1][dev->hats_state[hat_index][0] + 1];
+        return false;
+      }
     }
     break;
   }
@@ -537,6 +553,117 @@ void evdev_create(const char* device, struct mapping* mappings, bool verbose) {
   loop_add_fd(devices[dev].fd, &evdev_handle, POLLIN);
 }
 
+static void evdev_map_key(char* keyName, short* key) {
+  printf("Press %s\n", keyName);
+  currentKey = key;
+  currentHat = NULL;
+  currentAbs = NULL;
+  *key = -1;
+  loop_main();
+
+  usleep(250000);
+  evdev_drain();
+}
+
+static void evdev_map_abs(char* keyName, short* abs, bool* reverse) {
+  printf("Move %s\n", keyName);
+  currentKey = NULL;
+  currentHat = NULL;
+  currentAbs = abs;
+  currentReverse = reverse;
+  *abs = -1;
+  loop_main();
+
+  usleep(250000);
+  evdev_drain();
+}
+
+static void evdev_map_hatkey(char* keyName, short* hat, short* hat_dir, short* key) {
+  printf("Press %s\n", keyName);
+  currentKey = key;
+  currentHat = hat;
+  currentHatDir = hat_dir;
+  currentAbs = NULL;
+  *key = -1;
+  *hat = -1;
+  *hat_dir = -1;
+  *currentReverse = false;
+  loop_main();
+
+  usleep(250000);
+  evdev_drain();
+}
+
+static void evdev_map_abskey(char* keyName, short* abs, short* key, bool* reverse) {
+  printf("Press %s\n", keyName);
+  currentKey = key;
+  currentHat = NULL;
+  currentAbs = abs;
+  currentReverse = reverse;
+  *key = -1;
+  *abs = -1;
+  *currentReverse = false;
+  loop_main();
+
+  usleep(250000);
+  evdev_drain();
+}
+
+void evdev_map(char* device) {
+  int fd = open(device, O_RDONLY|O_NONBLOCK);
+  struct libevdev *evdev = libevdev_new();
+  libevdev_set_fd(evdev, fd);
+  const char* name = libevdev_get_name(evdev);
+
+  int16_t guid[8] = {0};
+  guid[0] = int16_to_le(libevdev_get_id_bustype(evdev));
+  guid[2] = int16_to_le(libevdev_get_id_vendor(evdev));
+  guid[4] = int16_to_le(libevdev_get_id_product(evdev));
+  guid[6] = int16_to_le(libevdev_get_id_version(evdev));
+  char str_guid[33];
+  char* buf = str_guid;
+  for (int i = 0; i < 16; i++)
+    buf += sprintf(buf, "%02x", ((unsigned char*) guid)[i]);
+  
+  struct mapping map;
+  strncpy(map.name, libevdev_get_name(evdev), sizeof(map.name));
+  strncpy(map.guid, str_guid, sizeof(map.name));
+
+  libevdev_free(evdev);
+  close(fd);
+
+  handler = evdev_handle_mapping_event;
+
+  evdev_map_abs("Left Stick Right", &(map.abs_leftx), &(map.reverse_leftx));
+  evdev_map_abs("Left Stick Up", &(map.abs_lefty), &(map.reverse_lefty));
+  evdev_map_key("Left Stick Button", &(map.btn_leftstick));
+
+  evdev_map_abs("Right Stick Right", &(map.abs_rightx), &(map.reverse_rightx));
+  evdev_map_abs("Right Stick Up", &(map.abs_righty), &(map.reverse_righty));
+  evdev_map_key("Right Stick Button", &(map.btn_rightstick));
+
+  evdev_map_hatkey("D-Pad Right", &(map.hat_dpright), &(map.hat_dir_dpright), &(map.btn_dpright));
+  evdev_map_hatkey("D-Pad Left", &(map.hat_dpleft), &(map.hat_dir_dpleft), &(map.btn_dpleft));
+  evdev_map_hatkey("D-Pad Up", &(map.hat_dpup), &(map.hat_dir_dpup), &(map.btn_dpup));
+  evdev_map_hatkey("D-Pad Down", &(map.hat_dpdown), &(map.hat_dir_dpdown), &(map.btn_dpdown));
+
+  evdev_map_key("Button X (1)", &(map.btn_x));
+  evdev_map_key("Button A (2)", &(map.btn_a));
+  evdev_map_key("Button B (3)", &(map.btn_b));
+  evdev_map_key("Button Y (4)", &(map.btn_y));
+  evdev_map_key("Back Button", &(map.btn_back));
+  evdev_map_key("Start Button", &(map.btn_start));
+  evdev_map_key("Special Button", &(map.btn_guide));
+
+  bool ignored;
+  evdev_map_abskey("Left Trigger", &(map.abs_lefttrigger), &(map.btn_lefttrigger), &ignored);
+  evdev_map_abskey("Right Trigger", &(map.abs_righttrigger), &(map.btn_righttrigger), &ignored);
+
+  evdev_map_key("Left Bumper", &(map.btn_leftshoulder));
+  evdev_map_key("Right Bumper", &(map.btn_rightshoulder));
+  mapping_print(&map);
+}
+
 void evdev_start() {
   // After grabbing, the only way to quit via the keyboard
   // is via the special key combo that the input handling

src/input/evdev.h

@@ -25,3 +25,4 @@ void evdev_loop();
 void evdev_init();
 void evdev_start();
 void evdev_stop();
+void evdev_map(char* device);

src/input/mapping.c

@@ -155,3 +155,39 @@ struct mapping* mapping_load(char* fileName, bool verbose) {
 
   return mappings;
 }
+
+#define print_btn(btn, code) if (code > -1) printf("%s:b%d,", btn, code)
+#define print_abs(abs, code) if (code > -1) printf("%s:a%d,", abs, code)
+#define print_hat(hat, code, dir) if (code > -1) printf("%s:h%d.%d,", hat, code, dir)
+
+void mapping_print(struct mapping* map) {
+  printf("%s,%s,", map->guid, map->name);
+  print_btn("a", map->btn_a);
+  print_btn("b", map->btn_b);
+  print_btn("x", map->btn_x);
+  print_btn("y", map->btn_y);
+  print_btn("start", map->btn_start);
+  print_btn("guide", map->btn_guide);
+  print_btn("back", map->btn_back);
+  print_btn("leftstick", map->btn_leftstick);
+  print_btn("rightstick", map->btn_rightstick);
+  print_btn("leftshoulder", map->btn_leftshoulder);
+  print_btn("rightshoulder", map->btn_rightshoulder);
+  print_btn("dpup", map->btn_dpup);
+  print_btn("dpleft", map->btn_dpleft);
+  print_btn("dpdown", map->btn_dpdown);
+  print_btn("dpright", map->btn_dpright);
+  print_hat("dpup", map->hat_dpup, map->hat_dir_dpup);
+  print_hat("dpleft", map->hat_dpleft, map->hat_dir_dpleft);
+  print_hat("dpdown", map->hat_dpdown, map->hat_dir_dpdown);
+  print_hat("dpright", map->hat_dpright, map->hat_dir_dpright);
+  print_abs("leftx", map->abs_leftx);
+  print_abs("lefty", map->abs_lefty);
+  print_abs("rightx", map->abs_rightx);
+  print_abs("righty", map->abs_righty);
+  print_abs("lefttrigger", map->abs_lefttrigger);
+  print_abs("righttrigger", map->abs_righttrigger);
+  print_btn("lefttrigger", map->btn_lefttrigger);
+  print_btn("righttrigger", map->btn_righttrigger);
+  printf("platform:Linux\n");
+}

src/input/mapping.h

@@ -49,3 +49,4 @@ struct mapping {
 
 struct mapping* mapping_parse(char* mapping);
 struct mapping* mapping_load(char* fileName, bool verbose);
+void mapping_print(struct mapping*);

src/main.c

@@ -139,6 +139,7 @@ static void help() {
   printf("\tstream\t\t\tStream computer to device\n");
   printf("\tlist\t\t\tList available games and applications\n");
   printf("\tquit\t\t\tQuit the application or game being streamed\n");
+  printf("\tmap\t\t\tCreate mapping file for gamepad\n");
   printf("\thelp\t\t\tShow this help\n");
   printf("\n Global Options\n\n");
   printf("\t-config <config>\tLoad configuration file\n");
@@ -194,6 +195,17 @@ int main(int argc, char* argv[]) {
   if (config.debug_level > 0)
     printf("Moonlight Embedded %d.%d.%d (%s)\n", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH, COMPILE_OPTIONS);
 
+  if (strcmp("map", config.action) == 0) { 
+    if (config.inputsCount != 1) {
+      printf("You need to specify one input device using -input.\n");
+      exit(-1);
+    }
+ 
+    evdev_create(config.inputs[0], NULL, config.debug_level > 0);
+    evdev_map(config.inputs[0]); 
+    exit(0); 
+  }
+
   if (config.address == NULL) {
     config.address = malloc(MAX_ADDRESS_SIZE);
     if (config.address == NULL) {