Key to joy v0.01

genkeys.sh

@@ -0,0 +1 @@
+echo '#include <linux/input.h>' | gcc -E -dM - | grep '#define KEY_' | cut -f2 -d" " | sed 's/KEY_.*/DEF_KEY(&)/' > def_keys.h

map.c

@@ -1,3 +1,16 @@
+/*
+ * Status:
+ *
+ * - Can map keys from some keyboard to keys on a joystick.
+ *
+ * Does not:
+ * - Show up as a joystick device?
+ * - Emulate multiple joysticks
+ * - Have a nice mapping file format / datastructures YET.
+ *
+ */
+
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -14,18 +27,72 @@
 /*#define INPUT_PATH "/dev/input/by-path/platform-i8042-serio-0-event-kbd"*/
 #define UINPUT_PATH "/dev/uinput"
 
+/* Reverse mapping, for later use */
+static const struct _key_to_str {
+    char *name;
+    int num;
+} key_map[] = {
+#define DEF_KEY(NAME) \
+    {#NAME,NAME},
+    #include "def_keys.h"
+    {NULL, -1}
+};
+
+static int get_key_num(char* name)
+{
+    int i = 0;
+
+    while (key_map[i].name) {
+        if (!strcmp(key_map[i].name, name))
+            return key_map[i].num;
+
+        i++;
+    }
+
+    return -1;
+}
+
+
 /* TODO:
  * - Use atexit() to free joysticks
- * - Make joysticks static
- *
- *
+ * - Add file parsing / reading
+ * - Add proper datastructures to keep track
  */
 
 int main(int argc, char** argv) {
-    int in, uin;
+    int i, nowrite;
+    int in, uin; /* fds */
     struct input_event e, je;
     struct uinput_user_dev uidev;
 
+    /*
+     * KEY_LEFT -> ABS_HAT0X
+     * KEY_RIGHT -> ABS_HAT0X
+     * KEY_UP -> ABS_HAT0Y
+     * KEY_DOWN -> ABS_HAT0Y
+     *
+     * KEY_LEFTCTRL -> BTN_0
+     * KEY_LEFTALT -> BTN_1
+     * KEY_SPACE -> BTN_2
+     *
+     * KEY_1 -> BTN_3
+     */
+
+    int abskeyevs[] = {
+        ABS_HAT0X,
+        ABS_HAT0Y,
+        0
+    };
+
+    int evkeys[] = {
+        BTN_0,
+        BTN_1,
+        BTN_2,
+        BTN_3,
+        0
+    };
+
+    /* Open input and uinput */
     in = open(INPUT_PATH, O_RDONLY);
     if(in < 0) {
         perror("open in");
@@ -38,7 +105,7 @@ int main(int argc, char** argv) {
         return 2;
     }
 
-    /* Create devices */
+    /* Register device opts */
     if (ioctl(uin, UI_SET_EVBIT, EV_ABS) < 0) {
         perror("ioctl EV_ABS");
         return 1;
@@ -50,11 +117,26 @@ int main(int argc, char** argv) {
     }
 
     /* Every ``button'' needs to be registered */
-    if (ioctl(uin, UI_SET_ABSBIT, ABS_HAT0Y) < 0) {
-        perror("ioctl ABS_");
-        return 1;
+    i = 0;
+    while(abskeyevs[i] != 0) {
+        if (ioctl(uin, UI_SET_ABSBIT, abskeyevs[i]) < 0) {
+            perror("ioctl dynamic");
+            return 1;
+        }
+        i++;
     }
 
+    i = 0;
+    while(evkeys[i] != 0) {
+        if (ioctl(uin, UI_SET_KEYBIT, evkeys[i]) < 0) {
+            perror("ioctl dynamic 2");
+            return 1;
+        }
+        i++;
+    }
+
+
+    /* Allocate device info */
     memset(&uidev, '\0', sizeof(struct uinput_user_dev));
     snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "key2joy:1");
 
@@ -73,23 +155,46 @@ int main(int argc, char** argv) {
         return 1;
     }
 
+    /* Do it! */
     while (1) {
-        printf("in: %d, uin: %d\n", in, uin);
         if (read(in, &e, sizeof(struct input_event))) {
             printf("Event: (Type: %d, Code: %d, Value %d)\n", e.type, e.code, e.value);
         }
 
 
-        if (e.type == EV_KEY && e.code == KEY_UP) {
-            memset(&je, '\0', sizeof(struct input_event));
-            je.type = EV_ABS;
-            je.code = ABS_HAT0Y;
-            je.value = -e.value;
-            if(write(uin, &je, sizeof(struct input_event)) < 0) {
-                perror("EV_ABS Write event");
-                return -1;
+        memset(&je, '\0', sizeof(struct input_event));
+        nowrite = 0;
+
+        if (e.type == EV_KEY) {
+            switch(e.code) {
+            case KEY_UP:
+                je.type = EV_ABS; je.code = ABS_HAT0Y; je.value = -e.value; break;
+            case KEY_DOWN:
+                je.type = EV_ABS; je.code = ABS_HAT0Y; je.value = e.value; break;
+            case KEY_LEFT:
+                je.type = EV_ABS; je.code = ABS_HAT0X; je.value = -e.value; break;
+            case KEY_RIGHT:
+                je.type = EV_ABS; je.code = ABS_HAT0X; je.value = e.value; break;
+            case KEY_LEFTCTRL:
+                je.type = EV_KEY; je.code = BTN_0; je.value = e.value; break;
+            case KEY_LEFTALT:
+                je.type = EV_KEY; je.code = BTN_1; je.value = e.value; break;
+            case KEY_SPACE:
+                je.type = EV_KEY; je.code = BTN_2; je.value = e.value; break;
+            case KEY_1:
+                je.type = EV_KEY; je.code = BTN_3; je.value = e.value; break;
+            default:
+                nowrite = 1;
+            }
+            if (nowrite == 0) {
+                if(write(uin, &je, sizeof(struct input_event)) < 0) {
+                    perror("EV_ABS Write event");
+                    return -1;
+                }
             }
         }
+
+        /* Synchronisation events */
         if (e.type == EV_SYN) {
             memset(&je, '\0', sizeof(struct input_event));
             printf("SYN event\n");
@@ -103,7 +208,6 @@ int main(int argc, char** argv) {
                 return -1;
             }
         }
-        printf("---\n");
     }