lxdream 0.9.1| filename | src/drivers/joy_linux.c |
| changeset | 669:ab344e42bca9 |
| prev | 637:6a284eff5311 |
| next | 736:a02d1475ccfd |
| author | nkeynes |
| date | Mon May 12 10:00:13 2008 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Cleanup most of the -Wall warnings (getting a bit sloppy...) Convert FP code to use fixed banks rather than indirect pointer (3-4% faster this way now) |
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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 #define _GNU_SOURCE
20 #include <sys/types.h>
21 #include <sys/ioctl.h>
22 #include <errno.h>
23 #include <stdio.h>
24 #include <signal.h>
25 #include <string.h>
26 #include <stdlib.h>
27 #include <unistd.h>
28 #include <fcntl.h>
29 #include <dirent.h>
30 #include <ctype.h>
32 #include <linux/joystick.h>
33 #include <glib/giochannel.h>
34 #include <glib.h>
36 #include "lxdream.h"
37 #include "display.h"
38 #include "maple/maple.h"
39 #include "drivers/joy_linux.h"
41 #define INPUT_PATH "/dev/input"
43 typedef struct linux_joystick {
44 struct input_driver driver;
45 const gchar *filename;
46 char name[128];
47 int fd;
48 int button_count, axis_count;
49 GIOChannel *channel;
51 } *linux_joystick_t;
53 static gboolean linux_joystick_callback( GIOChannel *source, GIOCondition condition,
54 gpointer data );
55 static int linux_joystick_scan();
56 static linux_joystick_t linux_joystick_new( const gchar *filename, int fd );
57 static uint16_t linux_joystick_resolve_keysym( input_driver_t dev, const gchar *str );
58 static gchar *linux_joystick_keysym_for_keycode( input_driver_t dev, uint16_t keycode );
59 static void linux_joystick_destroy( input_driver_t joy );
60 static gboolean linux_joystick_install_watch( const gchar *dir );
61 static void linux_joystick_uninstall_watch( void );
63 /**
64 * Convert keysym to keycode. Keysyms are either Button%d or Axis%d[+-], with buttons
65 * numbered 1 .. button_count, then axes from button_count+1 .. button_count + axis_count*2.
66 * The first button is Button1. (no Button0)
67 * The first axis is Axis1+, then Axis1-, Axis2+ and so forth.
68 */
69 static uint16_t linux_joystick_resolve_keysym( input_driver_t dev, const gchar *str )
70 {
71 linux_joystick_t joy = (linux_joystick_t)dev;
72 if( strncasecmp( str, "Button", 6 ) == 0 ){
73 unsigned long button = strtoul( str+6, NULL, 10 );
74 if( button > joy->button_count ) {
75 return 0;
76 }
77 return (uint16_t)button;
78 } else if( strncasecmp( str, "Axis", 4 ) == 0 ) {
79 char *endptr;
80 unsigned long axis = strtoul( str+4, &endptr, 10 );
81 if( axis > joy->axis_count || axis == 0 ) {
82 return 0;
83 }
84 int keycode = ((axis - 1) << 1) + joy->button_count + 1;
85 if( *endptr == '-' ) {
86 return keycode + 1;
87 } else {
88 return keycode;
89 }
90 } else {
91 return 0;
92 }
93 }
95 static gchar *linux_joystick_keysym_for_keycode( input_driver_t dev, uint16_t keycode )
96 {
97 linux_joystick_t joy = (linux_joystick_t)dev;
98 if( keycode == 0 ) {
99 return NULL;
100 }
101 if( keycode <= joy->button_count ) {
102 return g_strdup_printf( "Button%d", keycode );
103 }
104 if( keycode <= joy->button_count + joy->axis_count*2 ) {
105 int axis = keycode - joy->button_count - 1;
106 if( (axis & 1) == 0 ) {
107 return g_strdup_printf( "Axis%d+", (axis >> 1)+1 );
108 } else {
109 return g_strdup_printf( "Axis%d-", (axis >> 1)+1 );
110 }
111 }
112 return NULL;
113 }
115 static void linux_joystick_destroy( input_driver_t dev )
116 {
117 linux_joystick_t joy = (linux_joystick_t)dev;
118 g_free( (gchar *)joy->filename );
119 g_io_channel_shutdown(joy->channel, FALSE, NULL );
120 g_io_channel_unref(joy->channel);
121 g_free( joy );
122 }
124 /**
125 * Callback from the GIOChannel whenever data is available, or an error/disconnect
126 * occurs.
127 *
128 * On data, process all pending events and direct them to the input system.
129 * On error, close the channel and delete the device.
130 */
131 static gboolean linux_joystick_callback( GIOChannel *source, GIOCondition condition,
132 gpointer data )
133 {
134 linux_joystick_t joy = (linux_joystick_t)data;
136 if( condition & G_IO_HUP ) {
137 INFO( "Joystick '%s' disconnected\n", joy->name );
138 input_unregister_device((input_driver_t)joy);
139 return FALSE;
140 }
141 if( condition & G_IO_IN ) {
142 struct js_event event;
143 while( read( joy->fd, &event, sizeof(event) ) == sizeof(event) ) {
144 if( event.type == JS_EVENT_BUTTON ) {
145 int keycode = event.number+1;
146 if( event.value == 0 ) {
147 input_event_keyup( (input_driver_t)joy, keycode, 0 );
148 } else {
149 input_event_keydown( (input_driver_t)joy, keycode, event.value );
150 }
151 } else if( event.type == JS_EVENT_AXIS ) {
152 int keycode = (event.number*2) + joy->button_count + 1;
153 if( event.value == 0 ) {
154 input_event_keyup( (input_driver_t)joy, keycode, 0 );
155 input_event_keyup( (input_driver_t)joy, keycode+1, 0 );
156 } else if( event.value < 0 ) {
157 input_event_keydown( (input_driver_t)joy, keycode+1, -event.value );
158 input_event_keyup( (input_driver_t)joy, keycode, 0 );
159 } else {
160 input_event_keydown( (input_driver_t)joy, keycode, event.value );
161 input_event_keyup( (input_driver_t)joy, keycode+1, 0 );
162 }
163 }
164 }
165 }
166 return TRUE;
167 }
169 /**
170 * Create a new joystick device structure given filename and (open) file
171 * descriptor. The joystick is automatically added to the watch list.
172 * @return The new joystick, or NULL if an error occurred.
173 */
174 static linux_joystick_t linux_joystick_new( const gchar *filename, int fd )
175 {
176 linux_joystick_t joy = g_malloc0(sizeof(struct linux_joystick));
177 joy->filename = filename;
178 joy->fd = fd;
179 joy->name[0] = '\0';
180 joy->driver.resolve_keysym = linux_joystick_resolve_keysym;
181 joy->driver.get_keysym_for_keycode = linux_joystick_keysym_for_keycode;
182 joy->driver.destroy = linux_joystick_destroy;
184 char *p = strrchr(filename, '/');
185 if( p == NULL ) {
186 joy->driver.id = filename;
187 } else {
188 joy->driver.id = p+1;
189 }
191 if( ioctl( fd, JSIOCGNAME(128), joy->name ) == -1 ||
192 ioctl( fd, JSIOCGAXES, &joy->axis_count ) == -1 ||
193 ioctl( fd, JSIOCGBUTTONS, &joy->button_count ) == -1 ) {
194 ERROR( "Error reading joystick data from %s (%s)\n", filename, strerror(errno) );
195 g_free(joy);
196 return NULL;
197 }
199 joy->channel = g_io_channel_unix_new(fd);
200 g_io_add_watch( joy->channel, G_IO_IN|G_IO_ERR|G_IO_HUP, linux_joystick_callback, joy );
201 return joy;
202 }
204 static int linux_joystick_scan()
205 {
206 int joysticks = 0;
207 struct dirent *ent;
208 DIR *dir = opendir(INPUT_PATH);
210 if( dir == NULL ) {
211 return 0;
212 }
214 while( (ent = readdir(dir)) != NULL ) {
215 if( ent->d_name[0] == 'j' && ent->d_name[1] == 's' &&
216 isdigit(ent->d_name[2]) && !input_has_device(ent->d_name) ) {
217 gchar *name = g_strdup_printf( "%s/%s", INPUT_PATH, ent->d_name );
218 int fd = open(name, O_RDONLY|O_NONBLOCK);
219 if( fd == -1 ) {
220 g_free( name );
221 } else {
222 linux_joystick_t joy = linux_joystick_new( name, fd );
223 input_register_device( (input_driver_t)joy, (joy->axis_count*2) + joy->button_count );
224 INFO( "Attached joystick %s named '%s', (%d buttons, %d axes)",
225 joy->driver.id, joy->name, joy->button_count, joy->axis_count );
226 joysticks++;
227 }
228 }
229 }
231 closedir(dir);
232 return joysticks;
233 }
235 gboolean linux_joystick_init()
236 {
237 if( !linux_joystick_install_watch(INPUT_PATH) ) {
238 return FALSE;
239 }
240 linux_joystick_scan();
241 return TRUE;
242 }
244 void linux_joystick_shutdown(void)
245 {
246 linux_joystick_uninstall_watch();
247 }
249 /*************************** dnotify support **********************/
251 static volatile int need_input_rescan = 0;
252 static int watch_dir_fd;
254 static gboolean gtk_loop_check_input(gpointer data)
255 {
256 if( need_input_rescan == 1 ) {
257 need_input_rescan = 0;
258 int js = linux_joystick_scan();
259 if( js > 0 ) {
260 maple_reattach_all();
261 }
262 }
263 return need_input_rescan != 2;
264 }
266 static void dnotify_handler(int sig )
267 {
268 need_input_rescan = 1;
269 }
271 static gboolean linux_joystick_install_watch( const gchar *dir )
272 {
273 int fd = open( dir, O_RDONLY|O_NONBLOCK );
274 if( fd == -1 ) {
275 return FALSE;
276 }
278 signal( SIGRTMIN+1, dnotify_handler );
279 fcntl(fd, F_SETSIG, SIGRTMIN + 1);
280 if( fcntl(fd, F_NOTIFY, DN_CREATE|DN_MULTISHOT) == -1 ) {
281 close(fd);
282 return FALSE;
283 }
284 watch_dir_fd = fd;
285 g_timeout_add( 500, gtk_loop_check_input, NULL );
286 return TRUE;
287 }
289 static void linux_joystick_uninstall_watch(void)
290 {
291 signal( SIGRTMIN+1, SIG_IGN );
292 close( watch_dir_fd );
293 need_input_rescan = 2;
294 }
.