3 * Linux joystick support
13 #include <linux/joystick.h>
14 #include <sys/ioctl.h>
25 char joy_installed = 0;
28 joystick_device j_joystick[MAX_JOY_DEVS];
29 joystick_axis j_axis[JOY_MAX_AXES];
30 joystick_button j_button[JOY_MAX_BUTTONS];
32 int joy_num_axes = 0, j_num_buttons = 0;
35 int j_axes_in_sticks[MAX_JOY_DEVS]; /* number of axes in the first [x] sticks */
36 int j_buttons_in_sticks[MAX_JOY_DEVS]; /* number of buttons in the first [x] sticks */
40 int j_Get_joydev_axis_number (int all_axis_number) {
41 int i, joy_axis_number = all_axis_number;
43 for (i = 0; i < j_axis[all_axis_number].joydev; i++) {
44 joy_axis_number -= j_joystick[i].num_axes;
47 return joy_axis_number;
51 int j_Get_joydev_button_number (int all_button_number) {
52 int i, joy_button_number = all_button_number;
54 for (i = 0; i < j_button[all_button_number].joydev; i++) {
55 joy_button_number -= j_joystick[i].num_buttons;
58 return joy_button_number;
62 int j_Update_state () {
63 int num_processed = 0, i;
64 struct js_event current_event;
65 struct JS_DATA_TYPE joy_data;
67 for (i = 0; i < j_num_buttons; i++) {
68 //changed 6/24/1999 to finally squish the timedown bug - Owen Evans
69 if (j_button[i].state != j_button[i].last_state) {
70 if (j_button[i].state) {
71 j_button[i].downcount++;
72 j_button[i].timedown = timer_get_fixed_seconds();
76 j_button[i].last_state = j_button[i].state;
79 for (i = 0; i < MAX_JOY_DEVS; i++)
81 if (j_joystick[i].buffer >= 0) {
82 if (j_joystick[i].version) {
83 while (read (j_joystick[i].buffer, ¤t_event, sizeof (struct js_event)) > 0) {
85 switch (current_event.type & ~JS_EVENT_INIT) {
87 j_axis[j_axes_in_sticks[i] + current_event.number].value = current_event.value;
90 j_button[j_buttons_in_sticks[i] + current_event.number].state = current_event.value;
95 read (j_joystick[i].buffer, &joy_data, JS_RETURN);
96 j_axis[j_axes_in_sticks[i] + 0].value = joy_data.x;
97 j_axis[j_axes_in_sticks[i] + 1].value = joy_data.y;
98 j_button[j_buttons_in_sticks[i] + 0].state = (joy_data.buttons & 0x01);
99 j_button[j_buttons_in_sticks[i] + 1].state = (joy_data.buttons & 0x02) >> 1;
104 return num_processed;
108 void joy_set_cal_vals(int *axis_min, int *axis_center, int *axis_max)
110 /* stpohle - this is already done in the "joy_init" function, so we don't need it in here.
113 for (i = 0; i < JOY_NUM_AXES; i++)
115 j_axis[i].center_val = axis_center[i];
116 j_axis[i].min_val = axis_min[i];
117 j_axis[i].max_val = axis_max[i];
124 void joy_get_cal_vals(int *axis_min, int *axis_center, int *axis_max) {
127 //edited 05/18/99 Matt Mueller - we should return all axes instead of joy_num_axes, since they are all given to us in joy_set_cal_vals ( and because checker complains :)
128 for (i = 0; i < JOY_NUM_AXES; i++)
131 axis_center[i] = j_axis[i].center_val;
132 axis_min[i] = j_axis[i].min_val;
133 axis_max[i] = j_axis[i].max_val;
138 void joy_set_min (int axis_number, int value) {
139 j_axis[axis_number].min_val = value;
143 void joy_set_center (int axis_number, int value) {
144 j_axis[axis_number].center_val = value;
148 void joy_set_max (int axis_number, int value) {
149 j_axis[axis_number].max_val = value;
153 ubyte joy_get_present_mask () {
158 void joy_set_timer_rate (int max_value) {
159 timer_rate = max_value;
163 int joy_get_timer_rate () {
171 if (!joy_installed) return;
173 for (i = 0; i < j_num_buttons; i++) {
174 j_button[i].timedown = 0;
175 j_button[i].downcount = 0;
181 ubyte joystick_read_raw_axis (ubyte mask, int *axes) {
188 for (i = 0; i < joy_num_axes; i++)
190 axes[i] = j_axis[i].value;
197 /* joy_init () is pretty huge, a bit klunky, and by no means pretty. But who cares? It does the job and it's only run once. */
204 if (joy_installed) return 0;
207 if (!joy_installed) {
209 printf ("Initializing joystick... ");
211 j_joystick[0].buffer = open ("/dev/js0", O_NONBLOCK);
212 j_joystick[1].buffer = open ("/dev/js1", O_NONBLOCK);
213 j_joystick[2].buffer = open ("/dev/js2", O_NONBLOCK);
214 j_joystick[3].buffer = open ("/dev/js3", O_NONBLOCK);
215 j_joystick[4].buffer = open("/dev/input/js0", O_NONBLOCK);
216 j_joystick[5].buffer = open("/dev/input/js1", O_NONBLOCK);
217 j_joystick[6].buffer = open("/dev/input/js2", O_NONBLOCK);
218 j_joystick[7].buffer = open("/dev/input/js3", O_NONBLOCK);
220 // Determine whether any sticks were found
222 for (i = 0; i < MAX_JOY_DEVS; i++)
224 if (j_joystick[i].buffer >= 0)
234 for (i = 0; i < MAX_JOY_DEVS; i++)
236 if (j_joystick[i].buffer >= 0) {
237 ioctl (j_joystick[i].buffer, JSIOCGAXES, &j_joystick[i].num_axes);
238 ioctl (j_joystick[i].buffer, JSIOCGBUTTONS, &j_joystick[i].num_buttons);
239 ioctl (j_joystick[i].buffer, JSIOCGVERSION, &j_joystick[i].version);
240 if (!j_joystick[i].version) {
241 j_joystick[i].num_axes = 2;
242 j_joystick[i].num_buttons = 2;
243 printf ("js%d (v0.x) " , i);
245 printf ("js%d (v%d.%d.%d) ",
247 (j_joystick[i].version & 0xff0000) >> 16,
248 (j_joystick[i].version & 0xff00) >> 8,
249 j_joystick[i].version & 0xff);
252 for (j = joy_num_axes; j < (joy_num_axes + j_joystick[i].num_axes); j++)
254 j_axis[j].joydev = i;
255 if (j_joystick[i].version) {
256 j_axis[j].center_val = 0;
257 j_axis[j].max_val = 32767;
258 j_axis[j].min_val = -32767;
261 for (j = j_num_buttons; j < (j_num_buttons + j_joystick[i].num_buttons); j++) {
262 j_button[j].joydev = i;
265 joy_num_axes += j_joystick[i].num_axes;
266 j_num_buttons += j_joystick[i].num_buttons;
269 j_joystick[i].num_buttons = 0;
270 j_joystick[i].num_axes = 0;
273 for (j = 0; j < i; j++) {
274 j_axes_in_sticks[i] += j_joystick[j].num_axes;
275 j_buttons_in_sticks[i] += j_joystick[j].num_buttons;
279 printf ("no joysticks found\n");
285 if (joy_num_axes > JOY_MAX_AXES)
286 joy_num_axes = JOY_MAX_AXES;
287 if (j_num_buttons > JOY_MAX_BUTTONS)
288 j_num_buttons = JOY_MAX_BUTTONS;
302 if (!joy_installed) return;
304 for (i = 0; i < MAX_JOY_DEVS; i++)
306 if (j_joystick[i].buffer>=0) {
307 printf ("closing js%d\n", i);
308 close (j_joystick[i].buffer);
310 j_joystick[i].buffer=-1;
322 int joy_get_scaled_reading(int raw, int axis_num)
326 raw -= j_axis[axis_num].center_val;
329 d = j_axis[axis_num].center_val - j_axis[axis_num].min_val;
331 d = j_axis[axis_num].max_val - j_axis[axis_num].center_val;
336 x = ((raw << 7) / d);
345 //added on 4/13/99 by Victor Rachels to add deadzone control
346 d = (joy_deadzone) * 6;
347 if ((x > (-1*d)) && (x < d))
349 //end this section addition -VR
355 void joy_get_pos(int *x, int *y)
357 int axis[JOY_MAX_AXES];
359 if ((!joy_installed)||(!joy_present)) { *x=*y=0; return; }
361 joystick_read_raw_axis (JOY_ALL_AXIS, axis);
363 *x = joy_get_scaled_reading( axis[0], 0 );
364 *y = joy_get_scaled_reading( axis[1], 1 );
368 int joy_get_btns () {
373 int joy_get_button_state (int btn) {
376 if(btn >= j_num_buttons)
380 return j_button[btn].state;
384 int joy_get_button_down_cnt (int btn) {
391 downcount = j_button[btn].downcount;
392 j_button[btn].downcount = 0;
398 //changed 6/24/99 to finally squish the timedown bug - Owen Evans
399 fix joy_get_button_down_time(int btn) {
406 if (j_button[btn].state) {
407 downtime = timer_get_fixed_seconds() - j_button[btn].timedown;
408 j_button[btn].timedown = timer_get_fixed_seconds();
422 void joy_set_slow_reading(int flag) {