lxdream 0.9.1| filename | src/drivers/joy_linux.c |
| changeset | 984:a01567058a47 |
| prev | 736:a02d1475ccfd |
| next | 1010:a506a2f66180 |
| author | nkeynes |
| date | Wed Mar 25 11:57:05 2009 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Change glXMakeContextCurrent call to glXMakeCurrent - works around crash bug in mesa: http://www.mail-archive.com/mesa-commit@lists.freedesktop.org/msg04338.html |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * Linux joystick input device support
5 *
6 * Copyright (c) 2008 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
19 #ifndef _GNU_SOURCE
20 #define _GNU_SOURCE
21 #endif
22 #include <sys/types.h>
23 #include <sys/ioctl.h>
24 #include <errno.h>
25 #include <stdio.h>
26 #include <signal.h>
27 #include <string.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <fcntl.h>
31 #include <dirent.h>
32 #include <ctype.h>
34 #include <linux/joystick.h>
35 #include <glib/giochannel.h>
36 #include <glib.h>
38 #include "lxdream.h"
39 #include "display.h"
40 #include "maple/maple.h"
41 #include "drivers/joy_linux.h"
43 #define INPUT_PATH "/dev/input"
45 typedef struct linux_joystick {
46 struct input_driver driver;
47 const gchar *filename;
48 char name[128];
49 int fd;
50 int button_count, axis_count;
51 GIOChannel *channel;
53 } *linux_joystick_t;
55 static gboolean linux_joystick_callback( GIOChannel *source, GIOCondition condition,
56 gpointer data );
57 static int linux_joystick_scan();
58 static linux_joystick_t linux_joystick_new( const gchar *filename, int fd );
59 static uint16_t linux_joystick_resolve_keysym( input_driver_t dev, const gchar *str );
60 static gchar *linux_joystick_keysym_for_keycode( input_driver_t dev, uint16_t keycode );
61 static void linux_joystick_destroy( input_driver_t joy );
62 static gboolean linux_joystick_install_watch( const gchar *dir );
63 static void linux_joystick_uninstall_watch( void );
65 /**
66 * Convert keysym to keycode. Keysyms are either Button%d or Axis%d[+-], with buttons
67 * numbered 1 .. button_count, then axes from button_count+1 .. button_count + axis_count*2.
68 * The first button is Button1. (no Button0)
69 * The first axis is Axis1+, then Axis1-, Axis2+ and so forth.
70 */
71 static uint16_t linux_joystick_resolve_keysym( input_driver_t dev, const gchar *str )
72 {
73 linux_joystick_t joy = (linux_joystick_t)dev;
74 if( strncasecmp( str, "Button", 6 ) == 0 ){
75 unsigned long button = strtoul( str+6, NULL, 10 );
76 if( button > joy->button_count ) {
77 return 0;
78 }
79 return (uint16_t)button;
80 } else if( strncasecmp( str, "Axis", 4 ) == 0 ) {
81 char *endptr;
82 unsigned long axis = strtoul( str+4, &endptr, 10 );
83 if( axis > joy->axis_count || axis == 0 ) {
84 return 0;
85 }
86 int keycode = ((axis - 1) << 1) + joy->button_count + 1;
87 if( *endptr == '-' ) {
88 return keycode + 1;
89 } else {
90 return keycode;
91 }
92 } else {
93 return 0;
94 }
95 }
97 static gchar *linux_joystick_keysym_for_keycode( input_driver_t dev, uint16_t keycode )
98 {
99 linux_joystick_t joy = (linux_joystick_t)dev;
100 if( keycode == 0 ) {
101 return NULL;
102 }
103 if( keycode <= joy->button_count ) {
104 return g_strdup_printf( "Button%d", keycode );
105 }
106 if( keycode <= joy->button_count + joy->axis_count*2 ) {
107 int axis = keycode - joy->button_count - 1;
108 if( (axis & 1) == 0 ) {
109 return g_strdup_printf( "Axis%d+", (axis >> 1)+1 );
110 } else {
111 return g_strdup_printf( "Axis%d-", (axis >> 1)+1 );
112 }
113 }
114 return NULL;
115 }
117 static void linux_joystick_destroy( input_driver_t dev )
118 {
119 linux_joystick_t joy = (linux_joystick_t)dev;
120 g_free( (gchar *)joy->filename );
121 g_io_channel_shutdown(joy->channel, FALSE, NULL );
122 g_io_channel_unref(joy->channel);
123 g_free( joy );
124 }
126 /**
127 * Callback from the GIOChannel whenever data is available, or an error/disconnect
128 * occurs.
129 *
130 * On data, process all pending events and direct them to the input system.
131 * On error, close the channel and delete the device.
132 */
133 static gboolean linux_joystick_callback( GIOChannel *source, GIOCondition condition,
134 gpointer data )
135 {
136 linux_joystick_t joy = (linux_joystick_t)data;
138 if( condition & G_IO_HUP ) {
139 INFO( "Joystick '%s' disconnected\n", joy->name );
140 input_unregister_device((input_driver_t)joy);
141 return FALSE;
142 }
143 if( condition & G_IO_IN ) {
144 struct js_event event;
145 while( read( joy->fd, &event, sizeof(event) ) == sizeof(event) ) {
146 if( event.type == JS_EVENT_BUTTON ) {
147 int keycode = event.number+1;
148 if( event.value == 0 ) {
149 input_event_keyup( (input_driver_t)joy, keycode, 0 );
150 } else {
151 input_event_keydown( (input_driver_t)joy, keycode, event.value );
152 }
153 } else if( event.type == JS_EVENT_AXIS ) {
154 int keycode = (event.number*2) + joy->button_count + 1;
155 if( event.value == 0 ) {
156 input_event_keyup( (input_driver_t)joy, keycode, 0 );
157 input_event_keyup( (input_driver_t)joy, keycode+1, 0 );
158 } else if( event.value < 0 ) {
159 input_event_keydown( (input_driver_t)joy, keycode+1, -event.value );
160 input_event_keyup( (input_driver_t)joy, keycode, 0 );
161 } else {
162 input_event_keydown( (input_driver_t)joy, keycode, event.value );
163 input_event_keyup( (input_driver_t)joy, keycode+1, 0 );
164 }
165 }
166 }
167 }
168 return TRUE;
169 }
171 /**
172 * Create a new joystick device structure given filename and (open) file
173 * descriptor. The joystick is automatically added to the watch list.
174 * @return The new joystick, or NULL if an error occurred.
175 */
176 static linux_joystick_t linux_joystick_new( const gchar *filename, int fd )
177 {
178 linux_joystick_t joy = g_malloc0(sizeof(struct linux_joystick));
179 joy->filename = filename;
180 joy->fd = fd;
181 joy->name[0] = '\0';
182 joy->driver.resolve_keysym = linux_joystick_resolve_keysym;
183 joy->driver.get_keysym_for_keycode = linux_joystick_keysym_for_keycode;
184 joy->driver.destroy = linux_joystick_destroy;
186 char *p = strrchr(filename, '/');
187 if( p == NULL ) {
188 joy->driver.id = filename;
189 } else {
190 joy->driver.id = p+1;
191 }
193 if( ioctl( fd, JSIOCGNAME(128), joy->name ) == -1 ||
194 ioctl( fd, JSIOCGAXES, &joy->axis_count ) == -1 ||
195 ioctl( fd, JSIOCGBUTTONS, &joy->button_count ) == -1 ) {
196 ERROR( "Error reading joystick data from %s (%s)\n", filename, strerror(errno) );
197 g_free(joy);
198 return NULL;
199 }
201 joy->channel = g_io_channel_unix_new(fd);
202 g_io_add_watch( joy->channel, G_IO_IN|G_IO_ERR|G_IO_HUP, linux_joystick_callback, joy );
203 return joy;
204 }
206 static int linux_joystick_scan()
207 {
208 int joysticks = 0;
209 struct dirent *ent;
210 DIR *dir = opendir(INPUT_PATH);
212 if( dir == NULL ) {
213 return 0;
214 }
216 while( (ent = readdir(dir)) != NULL ) {
217 if( ent->d_name[0] == 'j' && ent->d_name[1] == 's' &&
218 isdigit(ent->d_name[2]) && !input_has_device(ent->d_name) ) {
219 gchar *name = g_strdup_printf( "%s/%s", INPUT_PATH, ent->d_name );
220 int fd = open(name, O_RDONLY|O_NONBLOCK);
221 if( fd == -1 ) {
222 g_free( name );
223 } else {
224 linux_joystick_t joy = linux_joystick_new( name, fd );
225 input_register_device( (input_driver_t)joy, (joy->axis_count*2) + joy->button_count );
226 INFO( "Attached joystick %s named '%s', (%d buttons, %d axes)",
227 joy->driver.id, joy->name, joy->button_count, joy->axis_count );
228 joysticks++;
229 }
230 }
231 }
233 closedir(dir);
234 return joysticks;
235 }
237 gboolean linux_joystick_init()
238 {
239 if( !linux_joystick_install_watch(INPUT_PATH) ) {
240 return FALSE;
241 }
242 linux_joystick_scan();
243 return TRUE;
244 }
246 void linux_joystick_shutdown(void)
247 {
248 linux_joystick_uninstall_watch();
249 }
251 /*************************** dnotify support **********************/
253 static volatile int need_input_rescan = 0;
254 static int watch_dir_fd;
256 static gboolean gtk_loop_check_input(gpointer data)
257 {
258 if( need_input_rescan == 1 ) {
259 need_input_rescan = 0;
260 int js = linux_joystick_scan();
261 if( js > 0 ) {
262 maple_reattach_all();
263 }
264 }
265 return need_input_rescan != 2;
266 }
268 static void dnotify_handler(int sig )
269 {
270 need_input_rescan = 1;
271 }
273 static gboolean linux_joystick_install_watch( const gchar *dir )
274 {
275 int fd = open( dir, O_RDONLY|O_NONBLOCK );
276 if( fd == -1 ) {
277 return FALSE;
278 }
280 signal( SIGRTMIN+1, dnotify_handler );
281 fcntl(fd, F_SETSIG, SIGRTMIN + 1);
282 if( fcntl(fd, F_NOTIFY, DN_CREATE|DN_MULTISHOT) == -1 ) {
283 close(fd);
284 return FALSE;
285 }
286 watch_dir_fd = fd;
287 g_timeout_add( 500, gtk_loop_check_input, NULL );
288 return TRUE;
289 }
291 static void linux_joystick_uninstall_watch(void)
292 {
293 signal( SIGRTMIN+1, SIG_IGN );
294 close( watch_dir_fd );
295 need_input_rescan = 2;
296 }
.