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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic gameport layer | |
3 | * | |
4 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
5 | * Copyright (c) 2005 Dmitry Torokhov | |
6 | */ | |
7 | ||
8 | /* | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License version 2 as published by | |
11 | * the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/stddef.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/gameport.h> | |
19 | #include <linux/wait.h> | |
1da177e4 | 20 | #include <linux/sched.h> |
1da177e4 LT |
21 | #include <linux/slab.h> |
22 | #include <linux/delay.h> | |
3c803e8e | 23 | #include <linux/kthread.h> |
4e57b681 | 24 | #include <linux/sched.h> /* HZ */ |
286295eb | 25 | #include <linux/mutex.h> |
1da177e4 LT |
26 | |
27 | /*#include <asm/io.h>*/ | |
28 | ||
29 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
30 | MODULE_DESCRIPTION("Generic gameport layer"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | EXPORT_SYMBOL(__gameport_register_port); | |
34 | EXPORT_SYMBOL(gameport_unregister_port); | |
35 | EXPORT_SYMBOL(__gameport_register_driver); | |
36 | EXPORT_SYMBOL(gameport_unregister_driver); | |
37 | EXPORT_SYMBOL(gameport_open); | |
38 | EXPORT_SYMBOL(gameport_close); | |
39 | EXPORT_SYMBOL(gameport_rescan); | |
40 | EXPORT_SYMBOL(gameport_cooked_read); | |
41 | EXPORT_SYMBOL(gameport_set_name); | |
42 | EXPORT_SYMBOL(gameport_set_phys); | |
43 | EXPORT_SYMBOL(gameport_start_polling); | |
44 | EXPORT_SYMBOL(gameport_stop_polling); | |
45 | ||
46 | /* | |
286295eb | 47 | * gameport_mutex protects entire gameport subsystem and is taken |
1da177e4 LT |
48 | * every time gameport port or driver registrered or unregistered. |
49 | */ | |
286295eb | 50 | static DEFINE_MUTEX(gameport_mutex); |
1da177e4 LT |
51 | |
52 | static LIST_HEAD(gameport_list); | |
53 | ||
29a4a20e | 54 | static struct bus_type gameport_bus; |
1da177e4 LT |
55 | |
56 | static void gameport_add_port(struct gameport *gameport); | |
57 | static void gameport_destroy_port(struct gameport *gameport); | |
58 | static void gameport_reconnect_port(struct gameport *gameport); | |
59 | static void gameport_disconnect_port(struct gameport *gameport); | |
60 | ||
61 | #if defined(__i386__) | |
62 | ||
306e440d IM |
63 | #include <asm/i8253.h> |
64 | ||
1da177e4 LT |
65 | #define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
66 | #define GET_TIME(x) do { x = get_time_pit(); } while (0) | |
67 | ||
68 | static unsigned int get_time_pit(void) | |
69 | { | |
1da177e4 LT |
70 | unsigned long flags; |
71 | unsigned int count; | |
72 | ||
73 | spin_lock_irqsave(&i8253_lock, flags); | |
74 | outb_p(0x00, 0x43); | |
75 | count = inb_p(0x40); | |
76 | count |= inb_p(0x40) << 8; | |
77 | spin_unlock_irqrestore(&i8253_lock, flags); | |
78 | ||
79 | return count; | |
80 | } | |
81 | ||
82 | #endif | |
83 | ||
84 | ||
85 | ||
86 | /* | |
87 | * gameport_measure_speed() measures the gameport i/o speed. | |
88 | */ | |
89 | ||
90 | static int gameport_measure_speed(struct gameport *gameport) | |
91 | { | |
92 | #if defined(__i386__) | |
93 | ||
94 | unsigned int i, t, t1, t2, t3, tx; | |
95 | unsigned long flags; | |
96 | ||
97 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
98 | return 0; | |
99 | ||
100 | tx = 1 << 30; | |
101 | ||
102 | for(i = 0; i < 50; i++) { | |
103 | local_irq_save(flags); | |
104 | GET_TIME(t1); | |
105 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
106 | GET_TIME(t2); | |
107 | GET_TIME(t3); | |
108 | local_irq_restore(flags); | |
109 | udelay(i * 10); | |
110 | if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; | |
111 | } | |
112 | ||
113 | gameport_close(gameport); | |
114 | return 59659 / (tx < 1 ? 1 : tx); | |
115 | ||
116 | #elif defined (__x86_64__) | |
117 | ||
118 | unsigned int i, t; | |
119 | unsigned long tx, t1, t2, flags; | |
120 | ||
121 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
122 | return 0; | |
123 | ||
124 | tx = 1 << 30; | |
125 | ||
126 | for(i = 0; i < 50; i++) { | |
127 | local_irq_save(flags); | |
128 | rdtscl(t1); | |
129 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
130 | rdtscl(t2); | |
131 | local_irq_restore(flags); | |
132 | udelay(i * 10); | |
133 | if (t2 - t1 < tx) tx = t2 - t1; | |
134 | } | |
135 | ||
136 | gameport_close(gameport); | |
39c715b7 | 137 | return (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx); |
1da177e4 LT |
138 | |
139 | #else | |
140 | ||
141 | unsigned int j, t = 0; | |
142 | ||
143 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
144 | return 0; | |
145 | ||
146 | j = jiffies; while (j == jiffies); | |
147 | j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } | |
148 | ||
149 | gameport_close(gameport); | |
150 | return t * HZ / 1000; | |
151 | ||
152 | #endif | |
153 | } | |
154 | ||
155 | void gameport_start_polling(struct gameport *gameport) | |
156 | { | |
157 | spin_lock(&gameport->timer_lock); | |
158 | ||
159 | if (!gameport->poll_cnt++) { | |
160 | BUG_ON(!gameport->poll_handler); | |
161 | BUG_ON(!gameport->poll_interval); | |
162 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
163 | } | |
164 | ||
165 | spin_unlock(&gameport->timer_lock); | |
166 | } | |
167 | ||
168 | void gameport_stop_polling(struct gameport *gameport) | |
169 | { | |
170 | spin_lock(&gameport->timer_lock); | |
171 | ||
172 | if (!--gameport->poll_cnt) | |
173 | del_timer(&gameport->poll_timer); | |
174 | ||
175 | spin_unlock(&gameport->timer_lock); | |
176 | } | |
177 | ||
178 | static void gameport_run_poll_handler(unsigned long d) | |
179 | { | |
180 | struct gameport *gameport = (struct gameport *)d; | |
181 | ||
182 | gameport->poll_handler(gameport); | |
183 | if (gameport->poll_cnt) | |
184 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
185 | } | |
186 | ||
187 | /* | |
188 | * Basic gameport -> driver core mappings | |
189 | */ | |
190 | ||
191 | static void gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv) | |
192 | { | |
193 | down_write(&gameport_bus.subsys.rwsem); | |
194 | ||
195 | gameport->dev.driver = &drv->driver; | |
196 | if (drv->connect(gameport, drv)) { | |
197 | gameport->dev.driver = NULL; | |
198 | goto out; | |
199 | } | |
200 | device_bind_driver(&gameport->dev); | |
201 | out: | |
202 | up_write(&gameport_bus.subsys.rwsem); | |
203 | } | |
204 | ||
205 | static void gameport_release_driver(struct gameport *gameport) | |
206 | { | |
207 | down_write(&gameport_bus.subsys.rwsem); | |
208 | device_release_driver(&gameport->dev); | |
209 | up_write(&gameport_bus.subsys.rwsem); | |
210 | } | |
211 | ||
212 | static void gameport_find_driver(struct gameport *gameport) | |
213 | { | |
214 | down_write(&gameport_bus.subsys.rwsem); | |
215 | device_attach(&gameport->dev); | |
216 | up_write(&gameport_bus.subsys.rwsem); | |
217 | } | |
218 | ||
219 | ||
220 | /* | |
221 | * Gameport event processing. | |
222 | */ | |
223 | ||
224 | enum gameport_event_type { | |
225 | GAMEPORT_RESCAN, | |
226 | GAMEPORT_RECONNECT, | |
227 | GAMEPORT_REGISTER_PORT, | |
228 | GAMEPORT_REGISTER_DRIVER, | |
229 | }; | |
230 | ||
231 | struct gameport_event { | |
232 | enum gameport_event_type type; | |
233 | void *object; | |
234 | struct module *owner; | |
235 | struct list_head node; | |
236 | }; | |
237 | ||
238 | static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */ | |
239 | static LIST_HEAD(gameport_event_list); | |
240 | static DECLARE_WAIT_QUEUE_HEAD(gameport_wait); | |
3c803e8e | 241 | static struct task_struct *gameport_task; |
1da177e4 LT |
242 | |
243 | static void gameport_queue_event(void *object, struct module *owner, | |
244 | enum gameport_event_type event_type) | |
245 | { | |
246 | unsigned long flags; | |
247 | struct gameport_event *event; | |
248 | ||
249 | spin_lock_irqsave(&gameport_event_lock, flags); | |
250 | ||
251 | /* | |
3c803e8e | 252 | * Scan event list for the other events for the same gameport port, |
1da177e4 LT |
253 | * starting with the most recent one. If event is the same we |
254 | * do not need add new one. If event is of different type we | |
255 | * need to add this event and should not look further because | |
256 | * we need to preseve sequence of distinct events. | |
3c803e8e | 257 | */ |
1da177e4 LT |
258 | list_for_each_entry_reverse(event, &gameport_event_list, node) { |
259 | if (event->object == object) { | |
260 | if (event->type == event_type) | |
261 | goto out; | |
262 | break; | |
263 | } | |
264 | } | |
265 | ||
266 | if ((event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC))) { | |
267 | if (!try_module_get(owner)) { | |
268 | printk(KERN_WARNING "gameport: Can't get module reference, dropping event %d\n", event_type); | |
642fde17 | 269 | kfree(event); |
1da177e4 LT |
270 | goto out; |
271 | } | |
272 | ||
273 | event->type = event_type; | |
274 | event->object = object; | |
275 | event->owner = owner; | |
276 | ||
277 | list_add_tail(&event->node, &gameport_event_list); | |
278 | wake_up(&gameport_wait); | |
279 | } else { | |
280 | printk(KERN_ERR "gameport: Not enough memory to queue event %d\n", event_type); | |
281 | } | |
282 | out: | |
283 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
284 | } | |
285 | ||
286 | static void gameport_free_event(struct gameport_event *event) | |
287 | { | |
288 | module_put(event->owner); | |
289 | kfree(event); | |
290 | } | |
291 | ||
292 | static void gameport_remove_duplicate_events(struct gameport_event *event) | |
293 | { | |
294 | struct list_head *node, *next; | |
295 | struct gameport_event *e; | |
296 | unsigned long flags; | |
297 | ||
298 | spin_lock_irqsave(&gameport_event_lock, flags); | |
299 | ||
300 | list_for_each_safe(node, next, &gameport_event_list) { | |
301 | e = list_entry(node, struct gameport_event, node); | |
302 | if (event->object == e->object) { | |
303 | /* | |
304 | * If this event is of different type we should not | |
305 | * look further - we only suppress duplicate events | |
306 | * that were sent back-to-back. | |
307 | */ | |
308 | if (event->type != e->type) | |
309 | break; | |
310 | ||
311 | list_del_init(node); | |
312 | gameport_free_event(e); | |
313 | } | |
314 | } | |
315 | ||
316 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
317 | } | |
318 | ||
319 | ||
320 | static struct gameport_event *gameport_get_event(void) | |
321 | { | |
322 | struct gameport_event *event; | |
323 | struct list_head *node; | |
324 | unsigned long flags; | |
325 | ||
326 | spin_lock_irqsave(&gameport_event_lock, flags); | |
327 | ||
328 | if (list_empty(&gameport_event_list)) { | |
329 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
330 | return NULL; | |
331 | } | |
332 | ||
333 | node = gameport_event_list.next; | |
334 | event = list_entry(node, struct gameport_event, node); | |
335 | list_del_init(node); | |
336 | ||
337 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
338 | ||
339 | return event; | |
340 | } | |
341 | ||
9e50afd0 | 342 | static void gameport_handle_event(void) |
1da177e4 LT |
343 | { |
344 | struct gameport_event *event; | |
345 | struct gameport_driver *gameport_drv; | |
346 | ||
286295eb | 347 | mutex_lock(&gameport_mutex); |
1da177e4 | 348 | |
9e50afd0 DT |
349 | /* |
350 | * Note that we handle only one event here to give swsusp | |
351 | * a chance to freeze kgameportd thread. Gameport events | |
352 | * should be pretty rare so we are not concerned about | |
353 | * taking performance hit. | |
354 | */ | |
355 | if ((event = gameport_get_event())) { | |
1da177e4 LT |
356 | |
357 | switch (event->type) { | |
358 | case GAMEPORT_REGISTER_PORT: | |
359 | gameport_add_port(event->object); | |
360 | break; | |
361 | ||
362 | case GAMEPORT_RECONNECT: | |
363 | gameport_reconnect_port(event->object); | |
364 | break; | |
365 | ||
366 | case GAMEPORT_RESCAN: | |
367 | gameport_disconnect_port(event->object); | |
368 | gameport_find_driver(event->object); | |
369 | break; | |
370 | ||
371 | case GAMEPORT_REGISTER_DRIVER: | |
372 | gameport_drv = event->object; | |
373 | driver_register(&gameport_drv->driver); | |
374 | break; | |
375 | ||
376 | default: | |
377 | break; | |
378 | } | |
379 | ||
380 | gameport_remove_duplicate_events(event); | |
381 | gameport_free_event(event); | |
382 | } | |
383 | ||
286295eb | 384 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
385 | } |
386 | ||
387 | /* | |
388 | * Remove all events that have been submitted for a given gameport port. | |
389 | */ | |
390 | static void gameport_remove_pending_events(struct gameport *gameport) | |
391 | { | |
392 | struct list_head *node, *next; | |
393 | struct gameport_event *event; | |
394 | unsigned long flags; | |
395 | ||
396 | spin_lock_irqsave(&gameport_event_lock, flags); | |
397 | ||
398 | list_for_each_safe(node, next, &gameport_event_list) { | |
399 | event = list_entry(node, struct gameport_event, node); | |
400 | if (event->object == gameport) { | |
401 | list_del_init(node); | |
402 | gameport_free_event(event); | |
403 | } | |
404 | } | |
405 | ||
406 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Destroy child gameport port (if any) that has not been fully registered yet. | |
411 | * | |
412 | * Note that we rely on the fact that port can have only one child and therefore | |
413 | * only one child registration request can be pending. Additionally, children | |
414 | * are registered by driver's connect() handler so there can't be a grandchild | |
415 | * pending registration together with a child. | |
416 | */ | |
417 | static struct gameport *gameport_get_pending_child(struct gameport *parent) | |
418 | { | |
419 | struct gameport_event *event; | |
420 | struct gameport *gameport, *child = NULL; | |
421 | unsigned long flags; | |
422 | ||
423 | spin_lock_irqsave(&gameport_event_lock, flags); | |
424 | ||
425 | list_for_each_entry(event, &gameport_event_list, node) { | |
426 | if (event->type == GAMEPORT_REGISTER_PORT) { | |
427 | gameport = event->object; | |
428 | if (gameport->parent == parent) { | |
429 | child = gameport; | |
430 | break; | |
431 | } | |
432 | } | |
433 | } | |
434 | ||
435 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
436 | return child; | |
437 | } | |
438 | ||
439 | static int gameport_thread(void *nothing) | |
440 | { | |
1da177e4 | 441 | do { |
9e50afd0 | 442 | gameport_handle_event(); |
3c803e8e LT |
443 | wait_event_interruptible(gameport_wait, |
444 | kthread_should_stop() || !list_empty(&gameport_event_list)); | |
3e1d1d28 | 445 | try_to_freeze(); |
3c803e8e | 446 | } while (!kthread_should_stop()); |
1da177e4 LT |
447 | |
448 | printk(KERN_DEBUG "gameport: kgameportd exiting\n"); | |
3c803e8e | 449 | return 0; |
1da177e4 LT |
450 | } |
451 | ||
452 | ||
453 | /* | |
454 | * Gameport port operations | |
455 | */ | |
456 | ||
e404e274 | 457 | static ssize_t gameport_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
458 | { |
459 | struct gameport *gameport = to_gameport_port(dev); | |
460 | return sprintf(buf, "%s\n", gameport->name); | |
461 | } | |
462 | ||
e404e274 | 463 | static ssize_t gameport_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
464 | { |
465 | struct gameport *gameport = to_gameport_port(dev); | |
466 | struct device_driver *drv; | |
467 | int retval; | |
468 | ||
286295eb | 469 | retval = mutex_lock_interruptible(&gameport_mutex); |
1da177e4 LT |
470 | if (retval) |
471 | return retval; | |
472 | ||
473 | retval = count; | |
474 | if (!strncmp(buf, "none", count)) { | |
475 | gameport_disconnect_port(gameport); | |
476 | } else if (!strncmp(buf, "reconnect", count)) { | |
477 | gameport_reconnect_port(gameport); | |
478 | } else if (!strncmp(buf, "rescan", count)) { | |
479 | gameport_disconnect_port(gameport); | |
480 | gameport_find_driver(gameport); | |
481 | } else if ((drv = driver_find(buf, &gameport_bus)) != NULL) { | |
482 | gameport_disconnect_port(gameport); | |
483 | gameport_bind_driver(gameport, to_gameport_driver(drv)); | |
484 | put_driver(drv); | |
485 | } else { | |
486 | retval = -EINVAL; | |
487 | } | |
488 | ||
286295eb | 489 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
490 | |
491 | return retval; | |
492 | } | |
493 | ||
494 | static struct device_attribute gameport_device_attrs[] = { | |
495 | __ATTR(description, S_IRUGO, gameport_show_description, NULL), | |
496 | __ATTR(drvctl, S_IWUSR, NULL, gameport_rebind_driver), | |
497 | __ATTR_NULL | |
498 | }; | |
499 | ||
500 | static void gameport_release_port(struct device *dev) | |
501 | { | |
502 | struct gameport *gameport = to_gameport_port(dev); | |
503 | ||
504 | kfree(gameport); | |
505 | module_put(THIS_MODULE); | |
506 | } | |
507 | ||
508 | void gameport_set_phys(struct gameport *gameport, const char *fmt, ...) | |
509 | { | |
510 | va_list args; | |
511 | ||
512 | va_start(args, fmt); | |
513 | vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args); | |
514 | va_end(args); | |
515 | } | |
516 | ||
517 | /* | |
518 | * Prepare gameport port for registration. | |
519 | */ | |
520 | static void gameport_init_port(struct gameport *gameport) | |
521 | { | |
522 | static atomic_t gameport_no = ATOMIC_INIT(0); | |
523 | ||
524 | __module_get(THIS_MODULE); | |
525 | ||
286295eb | 526 | mutex_init(&gameport->drv_mutex); |
1da177e4 LT |
527 | device_initialize(&gameport->dev); |
528 | snprintf(gameport->dev.bus_id, sizeof(gameport->dev.bus_id), | |
529 | "gameport%lu", (unsigned long)atomic_inc_return(&gameport_no) - 1); | |
530 | gameport->dev.bus = &gameport_bus; | |
531 | gameport->dev.release = gameport_release_port; | |
532 | if (gameport->parent) | |
533 | gameport->dev.parent = &gameport->parent->dev; | |
534 | ||
535 | spin_lock_init(&gameport->timer_lock); | |
536 | init_timer(&gameport->poll_timer); | |
537 | gameport->poll_timer.function = gameport_run_poll_handler; | |
538 | gameport->poll_timer.data = (unsigned long)gameport; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Complete gameport port registration. | |
543 | * Driver core will attempt to find appropriate driver for the port. | |
544 | */ | |
545 | static void gameport_add_port(struct gameport *gameport) | |
546 | { | |
547 | if (gameport->parent) | |
548 | gameport->parent->child = gameport; | |
549 | ||
550 | gameport->speed = gameport_measure_speed(gameport); | |
551 | ||
552 | list_add_tail(&gameport->node, &gameport_list); | |
553 | ||
554 | if (gameport->io) | |
555 | printk(KERN_INFO "gameport: %s is %s, io %#x, speed %dkHz\n", | |
556 | gameport->name, gameport->phys, gameport->io, gameport->speed); | |
557 | else | |
558 | printk(KERN_INFO "gameport: %s is %s, speed %dkHz\n", | |
559 | gameport->name, gameport->phys, gameport->speed); | |
560 | ||
561 | device_add(&gameport->dev); | |
562 | gameport->registered = 1; | |
563 | } | |
564 | ||
565 | /* | |
566 | * gameport_destroy_port() completes deregistration process and removes | |
567 | * port from the system | |
568 | */ | |
569 | static void gameport_destroy_port(struct gameport *gameport) | |
570 | { | |
571 | struct gameport *child; | |
572 | ||
573 | child = gameport_get_pending_child(gameport); | |
574 | if (child) { | |
575 | gameport_remove_pending_events(child); | |
576 | put_device(&child->dev); | |
577 | } | |
578 | ||
579 | if (gameport->parent) { | |
580 | gameport->parent->child = NULL; | |
581 | gameport->parent = NULL; | |
582 | } | |
583 | ||
584 | if (gameport->registered) { | |
585 | device_del(&gameport->dev); | |
586 | list_del_init(&gameport->node); | |
587 | gameport->registered = 0; | |
588 | } | |
589 | ||
590 | gameport_remove_pending_events(gameport); | |
591 | put_device(&gameport->dev); | |
592 | } | |
593 | ||
594 | /* | |
595 | * Reconnect gameport port and all its children (re-initialize attached devices) | |
596 | */ | |
597 | static void gameport_reconnect_port(struct gameport *gameport) | |
598 | { | |
599 | do { | |
600 | if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) { | |
601 | gameport_disconnect_port(gameport); | |
602 | gameport_find_driver(gameport); | |
603 | /* Ok, old children are now gone, we are done */ | |
604 | break; | |
605 | } | |
606 | gameport = gameport->child; | |
607 | } while (gameport); | |
608 | } | |
609 | ||
610 | /* | |
611 | * gameport_disconnect_port() unbinds a port from its driver. As a side effect | |
612 | * all child ports are unbound and destroyed. | |
613 | */ | |
614 | static void gameport_disconnect_port(struct gameport *gameport) | |
615 | { | |
616 | struct gameport *s, *parent; | |
617 | ||
618 | if (gameport->child) { | |
619 | /* | |
620 | * Children ports should be disconnected and destroyed | |
621 | * first, staring with the leaf one, since we don't want | |
622 | * to do recursion | |
623 | */ | |
624 | for (s = gameport; s->child; s = s->child) | |
625 | /* empty */; | |
626 | ||
627 | do { | |
628 | parent = s->parent; | |
629 | ||
630 | gameport_release_driver(s); | |
631 | gameport_destroy_port(s); | |
632 | } while ((s = parent) != gameport); | |
633 | } | |
634 | ||
635 | /* | |
636 | * Ok, no children left, now disconnect this port | |
637 | */ | |
638 | gameport_release_driver(gameport); | |
639 | } | |
640 | ||
641 | void gameport_rescan(struct gameport *gameport) | |
642 | { | |
643 | gameport_queue_event(gameport, NULL, GAMEPORT_RESCAN); | |
644 | } | |
645 | ||
646 | void gameport_reconnect(struct gameport *gameport) | |
647 | { | |
648 | gameport_queue_event(gameport, NULL, GAMEPORT_RECONNECT); | |
649 | } | |
650 | ||
651 | /* | |
652 | * Submits register request to kgameportd for subsequent execution. | |
653 | * Note that port registration is always asynchronous. | |
654 | */ | |
655 | void __gameport_register_port(struct gameport *gameport, struct module *owner) | |
656 | { | |
657 | gameport_init_port(gameport); | |
658 | gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT); | |
659 | } | |
660 | ||
661 | /* | |
662 | * Synchronously unregisters gameport port. | |
663 | */ | |
664 | void gameport_unregister_port(struct gameport *gameport) | |
665 | { | |
286295eb | 666 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
667 | gameport_disconnect_port(gameport); |
668 | gameport_destroy_port(gameport); | |
286295eb | 669 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
670 | } |
671 | ||
672 | ||
673 | /* | |
674 | * Gameport driver operations | |
675 | */ | |
676 | ||
677 | static ssize_t gameport_driver_show_description(struct device_driver *drv, char *buf) | |
678 | { | |
679 | struct gameport_driver *driver = to_gameport_driver(drv); | |
680 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
681 | } | |
682 | ||
683 | static struct driver_attribute gameport_driver_attrs[] = { | |
684 | __ATTR(description, S_IRUGO, gameport_driver_show_description, NULL), | |
685 | __ATTR_NULL | |
686 | }; | |
687 | ||
688 | static int gameport_driver_probe(struct device *dev) | |
689 | { | |
690 | struct gameport *gameport = to_gameport_port(dev); | |
691 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
692 | ||
693 | drv->connect(gameport, drv); | |
694 | return gameport->drv ? 0 : -ENODEV; | |
695 | } | |
696 | ||
697 | static int gameport_driver_remove(struct device *dev) | |
698 | { | |
699 | struct gameport *gameport = to_gameport_port(dev); | |
700 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
701 | ||
702 | drv->disconnect(gameport); | |
703 | return 0; | |
704 | } | |
705 | ||
29a4a20e RK |
706 | static struct bus_type gameport_bus = { |
707 | .name = "gameport", | |
708 | .probe = gameport_driver_probe, | |
709 | .remove = gameport_driver_remove, | |
710 | }; | |
711 | ||
1da177e4 LT |
712 | void __gameport_register_driver(struct gameport_driver *drv, struct module *owner) |
713 | { | |
714 | drv->driver.bus = &gameport_bus; | |
1da177e4 LT |
715 | gameport_queue_event(drv, owner, GAMEPORT_REGISTER_DRIVER); |
716 | } | |
717 | ||
718 | void gameport_unregister_driver(struct gameport_driver *drv) | |
719 | { | |
720 | struct gameport *gameport; | |
721 | ||
286295eb | 722 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
723 | drv->ignore = 1; /* so gameport_find_driver ignores it */ |
724 | ||
725 | start_over: | |
726 | list_for_each_entry(gameport, &gameport_list, node) { | |
727 | if (gameport->drv == drv) { | |
728 | gameport_disconnect_port(gameport); | |
729 | gameport_find_driver(gameport); | |
730 | /* we could've deleted some ports, restart */ | |
731 | goto start_over; | |
732 | } | |
733 | } | |
734 | ||
735 | driver_unregister(&drv->driver); | |
286295eb | 736 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
737 | } |
738 | ||
739 | static int gameport_bus_match(struct device *dev, struct device_driver *drv) | |
740 | { | |
741 | struct gameport_driver *gameport_drv = to_gameport_driver(drv); | |
742 | ||
743 | return !gameport_drv->ignore; | |
744 | } | |
745 | ||
746 | static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv) | |
747 | { | |
286295eb | 748 | mutex_lock(&gameport->drv_mutex); |
1da177e4 | 749 | gameport->drv = drv; |
286295eb | 750 | mutex_unlock(&gameport->drv_mutex); |
1da177e4 LT |
751 | } |
752 | ||
753 | int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode) | |
754 | { | |
755 | ||
756 | if (gameport->open) { | |
757 | if (gameport->open(gameport, mode)) { | |
758 | return -1; | |
759 | } | |
760 | } else { | |
761 | if (mode != GAMEPORT_MODE_RAW) | |
762 | return -1; | |
763 | } | |
764 | ||
765 | gameport_set_drv(gameport, drv); | |
766 | return 0; | |
767 | } | |
768 | ||
769 | void gameport_close(struct gameport *gameport) | |
770 | { | |
771 | del_timer_sync(&gameport->poll_timer); | |
772 | gameport->poll_handler = NULL; | |
773 | gameport->poll_interval = 0; | |
774 | gameport_set_drv(gameport, NULL); | |
775 | if (gameport->close) | |
776 | gameport->close(gameport); | |
777 | } | |
778 | ||
779 | static int __init gameport_init(void) | |
780 | { | |
3c803e8e LT |
781 | gameport_task = kthread_run(gameport_thread, NULL, "kgameportd"); |
782 | if (IS_ERR(gameport_task)) { | |
1da177e4 | 783 | printk(KERN_ERR "gameport: Failed to start kgameportd\n"); |
3c803e8e | 784 | return PTR_ERR(gameport_task); |
1da177e4 LT |
785 | } |
786 | ||
787 | gameport_bus.dev_attrs = gameport_device_attrs; | |
788 | gameport_bus.drv_attrs = gameport_driver_attrs; | |
789 | gameport_bus.match = gameport_bus_match; | |
790 | bus_register(&gameport_bus); | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | static void __exit gameport_exit(void) | |
796 | { | |
797 | bus_unregister(&gameport_bus); | |
3c803e8e | 798 | kthread_stop(gameport_task); |
1da177e4 LT |
799 | } |
800 | ||
51c38f9b | 801 | subsys_initcall(gameport_init); |
1da177e4 | 802 | module_exit(gameport_exit); |