1 /* $Id: joystick.c,v 1.2 2003-01-01 00:55:03 btb Exp $ */
4 * Linux joystick support
14 #include <linux/joystick.h>
15 #include <sys/ioctl.h>
26 char joy_installed = 0;
29 joystick_device j_joystick[4];
30 joystick_axis j_axis[MAX_AXES];
31 joystick_button j_button[MAX_BUTTONS];
33 int j_num_axes = 0, j_num_buttons = 0;
36 int j_axes_in_sticks[4]; /* number of axes in the first [x] sticks */
37 int j_buttons_in_sticks[4]; /* number of buttons in the first [x] sticks */
41 int j_Get_joydev_axis_number (int all_axis_number) {
42 int i, joy_axis_number = all_axis_number;
44 for (i = 0; i < j_axis[all_axis_number].joydev; i++) {
45 joy_axis_number -= j_joystick[i].num_axes;
48 return joy_axis_number;
52 int j_Get_joydev_button_number (int all_button_number) {
53 int i, joy_button_number = all_button_number;
55 for (i = 0; i < j_button[all_button_number].joydev; i++) {
56 joy_button_number -= j_joystick[i].num_buttons;
59 return joy_button_number;
63 int j_Update_state () {
64 int num_processed = 0, i;
65 struct js_event current_event;
66 struct JS_DATA_TYPE joy_data;
68 for (i = 0; i < j_num_buttons; i++) {
69 //changed 6/24/1999 to finally squish the timedown bug - Owen Evans
70 if (j_button[i].state != j_button[i].last_state) {
71 if (j_button[i].state) {
72 j_button[i].downcount++;
73 j_button[i].timedown = timer_get_fixed_seconds();
77 j_button[i].last_state = j_button[i].state;
80 for (i = 0; i < 4; 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 < 4; i++) {
114 j_axis[i].center_val = axis_center[i];
115 j_axis[i].min_val = axis_min[i];
116 j_axis[i].max_val = axis_max[i];
123 void joy_get_cal_vals(int *axis_min, int *axis_center, int *axis_max) {
126 //edited 05/18/99 Matt Mueller - we should return all axes instead of j_num_axes, since they are all given to us in joy_set_cal_vals ( and because checker complains :)
127 for (i = 0; i < 4; i++) {
129 axis_center[i] = j_axis[i].center_val;
130 axis_min[i] = j_axis[i].min_val;
131 axis_max[i] = j_axis[i].max_val;
136 void joy_set_min (int axis_number, int value) {
137 j_axis[axis_number].min_val = value;
141 void joy_set_center (int axis_number, int value) {
142 j_axis[axis_number].center_val = value;
146 void joy_set_max (int axis_number, int value) {
147 j_axis[axis_number].max_val = value;
151 ubyte joy_get_present_mask () {
156 void joy_set_timer_rate (int max_value) {
157 timer_rate = max_value;
161 int joy_get_timer_rate () {
169 if (!joy_installed) return;
171 for (i = 0; i < j_num_buttons; i++) {
172 j_button[i].timedown = 0;
173 j_button[i].downcount = 0;
179 ubyte joystick_read_raw_axis (ubyte mask, int *axes) {
184 for (i = 0; i < j_num_axes; i++) {
185 axes[i] = j_axis[i].value;
192 /* 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. */
198 if (joy_installed) return 0;
201 if (!joy_installed) {
203 printf ("Initializing joystick... ");
205 j_joystick[0].buffer = open ("/dev/js0", O_NONBLOCK);
206 j_joystick[1].buffer = open ("/dev/js1", O_NONBLOCK);
207 j_joystick[2].buffer = open ("/dev/js2", O_NONBLOCK);
208 j_joystick[3].buffer = open ("/dev/js3", O_NONBLOCK);
210 if (j_joystick[0].buffer >= 0 || j_joystick[1].buffer >= 0 || j_joystick[2].buffer >= 0 || j_joystick[3].buffer >= 0) {
213 for (i = 0; i < 4; i++) {
214 if (j_joystick[i].buffer >= 0) {
215 ioctl (j_joystick[i].buffer, JSIOCGAXES, &j_joystick[i].num_axes);
216 ioctl (j_joystick[i].buffer, JSIOCGBUTTONS, &j_joystick[i].num_buttons);
217 ioctl (j_joystick[i].buffer, JSIOCGVERSION, &j_joystick[i].version);
218 if (!j_joystick[i].version) {
219 j_joystick[i].num_axes = 2;
220 j_joystick[i].num_buttons = 2;
221 printf ("js%d (v0.x) " , i);
223 printf ("js%d (v%d.%d.%d) ",
225 (j_joystick[i].version & 0xff0000) >> 16,
226 (j_joystick[i].version & 0xff00) >> 8,
227 j_joystick[i].version & 0xff);
230 for (j = j_num_axes; j < (j_num_axes + j_joystick[i].num_axes); j++) {
231 j_axis[j].joydev = i;
232 if (j_joystick[i].version) {
233 j_axis[j].center_val = 0;
234 j_axis[j].max_val = 32767;
235 j_axis[j].min_val = -32767;
238 for (j = j_num_buttons; j < (j_num_buttons + j_joystick[i].num_buttons); j++) {
239 j_button[j].joydev = i;
242 j_num_axes += j_joystick[i].num_axes;
243 j_num_buttons += j_joystick[i].num_buttons;
246 j_joystick[i].num_buttons = 0;
247 j_joystick[i].num_axes = 0;
250 for (j = 0; j < i; j++) {
251 j_axes_in_sticks[i] += j_joystick[j].num_axes;
252 j_buttons_in_sticks[i] += j_joystick[j].num_buttons;
256 printf ("no joysticks found\n");
262 if (j_num_axes > MAX_AXES)
263 j_num_axes = MAX_AXES;
264 if (j_num_buttons > MAX_BUTTONS)
265 j_num_buttons = MAX_BUTTONS;
279 if (!joy_installed) return;
281 for (i = 0; i < 4; i++) {
282 if (j_joystick[i].buffer>=0) {
283 printf ("closing js%d\n", i);
284 close (j_joystick[i].buffer);
286 j_joystick[i].buffer=-1;
298 int joy_get_scaled_reading(int raw, int axis_num)
302 raw -= j_axis[axis_num].center_val;
305 d = j_axis[axis_num].center_val - j_axis[axis_num].min_val;
307 d = j_axis[axis_num].max_val - j_axis[axis_num].center_val;
312 x = ((raw << 7) / d);
321 //added on 4/13/99 by Victor Rachels to add deadzone control
322 d = (joy_deadzone) * 6;
323 if ((x > (-1*d)) && (x < d))
325 //end this section addition -VR
331 void joy_get_pos(int *x, int *y) {
334 if ((!joy_installed)||(!joy_present)) { *x=*y=0; return; }
336 joystick_read_raw_axis (JOY_ALL_AXIS, axis);
338 *x = joy_get_scaled_reading( axis[0], 0 );
339 *y = joy_get_scaled_reading( axis[1], 1 );
343 int joy_get_btns () {
348 int joy_get_button_state (int btn) {
349 if(btn >= j_num_buttons)
353 return j_button[btn].state;
357 int joy_get_button_down_cnt (int btn) {
362 downcount = j_button[btn].downcount;
363 j_button[btn].downcount = 0;
369 //changed 6/24/99 to finally squish the timedown bug - Owen Evans
370 fix joy_get_button_down_time(int btn) {
374 if (j_button[btn].state) {
375 downtime = timer_get_fixed_seconds() - j_button[btn].timedown;
376 j_button[btn].timedown = timer_get_fixed_seconds();
390 void joy_set_slow_reading(int flag) {