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> |
7dfb7103 | 26 | #include <linux/freezer.h> |
1da177e4 LT |
27 | |
28 | /*#include <asm/io.h>*/ | |
29 | ||
30 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
31 | MODULE_DESCRIPTION("Generic gameport layer"); | |
32 | MODULE_LICENSE("GPL"); | |
33 | ||
34 | EXPORT_SYMBOL(__gameport_register_port); | |
35 | EXPORT_SYMBOL(gameport_unregister_port); | |
36 | EXPORT_SYMBOL(__gameport_register_driver); | |
37 | EXPORT_SYMBOL(gameport_unregister_driver); | |
38 | EXPORT_SYMBOL(gameport_open); | |
39 | EXPORT_SYMBOL(gameport_close); | |
40 | EXPORT_SYMBOL(gameport_rescan); | |
41 | EXPORT_SYMBOL(gameport_cooked_read); | |
42 | EXPORT_SYMBOL(gameport_set_name); | |
43 | EXPORT_SYMBOL(gameport_set_phys); | |
44 | EXPORT_SYMBOL(gameport_start_polling); | |
45 | EXPORT_SYMBOL(gameport_stop_polling); | |
46 | ||
47 | /* | |
286295eb | 48 | * gameport_mutex protects entire gameport subsystem and is taken |
1da177e4 LT |
49 | * every time gameport port or driver registrered or unregistered. |
50 | */ | |
286295eb | 51 | static DEFINE_MUTEX(gameport_mutex); |
1da177e4 LT |
52 | |
53 | static LIST_HEAD(gameport_list); | |
54 | ||
29a4a20e | 55 | static struct bus_type gameport_bus; |
1da177e4 | 56 | |
73b59a3b | 57 | static void gameport_add_driver(struct gameport_driver *drv); |
1da177e4 LT |
58 | static void gameport_add_port(struct gameport *gameport); |
59 | static void gameport_destroy_port(struct gameport *gameport); | |
60 | static void gameport_reconnect_port(struct gameport *gameport); | |
61 | static void gameport_disconnect_port(struct gameport *gameport); | |
62 | ||
63 | #if defined(__i386__) | |
64 | ||
306e440d IM |
65 | #include <asm/i8253.h> |
66 | ||
1da177e4 LT |
67 | #define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
68 | #define GET_TIME(x) do { x = get_time_pit(); } while (0) | |
69 | ||
70 | static unsigned int get_time_pit(void) | |
71 | { | |
1da177e4 LT |
72 | unsigned long flags; |
73 | unsigned int count; | |
74 | ||
75 | spin_lock_irqsave(&i8253_lock, flags); | |
76 | outb_p(0x00, 0x43); | |
77 | count = inb_p(0x40); | |
78 | count |= inb_p(0x40) << 8; | |
79 | spin_unlock_irqrestore(&i8253_lock, flags); | |
80 | ||
81 | return count; | |
82 | } | |
83 | ||
84 | #endif | |
85 | ||
86 | ||
87 | ||
88 | /* | |
89 | * gameport_measure_speed() measures the gameport i/o speed. | |
90 | */ | |
91 | ||
92 | static int gameport_measure_speed(struct gameport *gameport) | |
93 | { | |
94 | #if defined(__i386__) | |
95 | ||
96 | unsigned int i, t, t1, t2, t3, tx; | |
97 | unsigned long flags; | |
98 | ||
99 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
100 | return 0; | |
101 | ||
102 | tx = 1 << 30; | |
103 | ||
104 | for(i = 0; i < 50; i++) { | |
105 | local_irq_save(flags); | |
106 | GET_TIME(t1); | |
107 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
108 | GET_TIME(t2); | |
109 | GET_TIME(t3); | |
110 | local_irq_restore(flags); | |
111 | udelay(i * 10); | |
112 | if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; | |
113 | } | |
114 | ||
115 | gameport_close(gameport); | |
116 | return 59659 / (tx < 1 ? 1 : tx); | |
117 | ||
118 | #elif defined (__x86_64__) | |
119 | ||
120 | unsigned int i, t; | |
121 | unsigned long tx, t1, t2, flags; | |
122 | ||
123 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
124 | return 0; | |
125 | ||
126 | tx = 1 << 30; | |
127 | ||
128 | for(i = 0; i < 50; i++) { | |
129 | local_irq_save(flags); | |
130 | rdtscl(t1); | |
131 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
132 | rdtscl(t2); | |
133 | local_irq_restore(flags); | |
134 | udelay(i * 10); | |
135 | if (t2 - t1 < tx) tx = t2 - t1; | |
136 | } | |
137 | ||
138 | gameport_close(gameport); | |
39c715b7 | 139 | return (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx); |
1da177e4 LT |
140 | |
141 | #else | |
142 | ||
143 | unsigned int j, t = 0; | |
144 | ||
145 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
146 | return 0; | |
147 | ||
148 | j = jiffies; while (j == jiffies); | |
149 | j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } | |
150 | ||
151 | gameport_close(gameport); | |
152 | return t * HZ / 1000; | |
153 | ||
154 | #endif | |
155 | } | |
156 | ||
157 | void gameport_start_polling(struct gameport *gameport) | |
158 | { | |
159 | spin_lock(&gameport->timer_lock); | |
160 | ||
161 | if (!gameport->poll_cnt++) { | |
162 | BUG_ON(!gameport->poll_handler); | |
163 | BUG_ON(!gameport->poll_interval); | |
164 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
165 | } | |
166 | ||
167 | spin_unlock(&gameport->timer_lock); | |
168 | } | |
169 | ||
170 | void gameport_stop_polling(struct gameport *gameport) | |
171 | { | |
172 | spin_lock(&gameport->timer_lock); | |
173 | ||
174 | if (!--gameport->poll_cnt) | |
175 | del_timer(&gameport->poll_timer); | |
176 | ||
177 | spin_unlock(&gameport->timer_lock); | |
178 | } | |
179 | ||
180 | static void gameport_run_poll_handler(unsigned long d) | |
181 | { | |
182 | struct gameport *gameport = (struct gameport *)d; | |
183 | ||
184 | gameport->poll_handler(gameport); | |
185 | if (gameport->poll_cnt) | |
186 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Basic gameport -> driver core mappings | |
191 | */ | |
192 | ||
193 | static void gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv) | |
194 | { | |
23de1510 DT |
195 | int error; |
196 | ||
1da177e4 LT |
197 | down_write(&gameport_bus.subsys.rwsem); |
198 | ||
199 | gameport->dev.driver = &drv->driver; | |
200 | if (drv->connect(gameport, drv)) { | |
201 | gameport->dev.driver = NULL; | |
202 | goto out; | |
203 | } | |
23de1510 DT |
204 | |
205 | error = device_bind_driver(&gameport->dev); | |
206 | if (error) { | |
207 | printk(KERN_WARNING | |
208 | "gameport: device_bind_driver() failed " | |
209 | "for %s (%s) and %s, error: %d\n", | |
210 | gameport->phys, gameport->name, | |
211 | drv->description, error); | |
212 | drv->disconnect(gameport); | |
213 | gameport->dev.driver = NULL; | |
214 | goto out; | |
215 | } | |
216 | ||
217 | out: | |
1da177e4 LT |
218 | up_write(&gameport_bus.subsys.rwsem); |
219 | } | |
220 | ||
221 | static void gameport_release_driver(struct gameport *gameport) | |
222 | { | |
223 | down_write(&gameport_bus.subsys.rwsem); | |
224 | device_release_driver(&gameport->dev); | |
225 | up_write(&gameport_bus.subsys.rwsem); | |
226 | } | |
227 | ||
228 | static void gameport_find_driver(struct gameport *gameport) | |
229 | { | |
73b59a3b RD |
230 | int error; |
231 | ||
1da177e4 | 232 | down_write(&gameport_bus.subsys.rwsem); |
73b59a3b RD |
233 | error = device_attach(&gameport->dev); |
234 | if (error < 0) | |
235 | printk(KERN_WARNING | |
236 | "gameport: device_attach() failed for %s (%s), error: %d\n", | |
237 | gameport->phys, gameport->name, error); | |
1da177e4 LT |
238 | up_write(&gameport_bus.subsys.rwsem); |
239 | } | |
240 | ||
241 | ||
242 | /* | |
243 | * Gameport event processing. | |
244 | */ | |
245 | ||
246 | enum gameport_event_type { | |
247 | GAMEPORT_RESCAN, | |
248 | GAMEPORT_RECONNECT, | |
249 | GAMEPORT_REGISTER_PORT, | |
250 | GAMEPORT_REGISTER_DRIVER, | |
251 | }; | |
252 | ||
253 | struct gameport_event { | |
254 | enum gameport_event_type type; | |
255 | void *object; | |
256 | struct module *owner; | |
257 | struct list_head node; | |
258 | }; | |
259 | ||
260 | static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */ | |
261 | static LIST_HEAD(gameport_event_list); | |
262 | static DECLARE_WAIT_QUEUE_HEAD(gameport_wait); | |
3c803e8e | 263 | static struct task_struct *gameport_task; |
1da177e4 LT |
264 | |
265 | static void gameport_queue_event(void *object, struct module *owner, | |
266 | enum gameport_event_type event_type) | |
267 | { | |
268 | unsigned long flags; | |
269 | struct gameport_event *event; | |
270 | ||
271 | spin_lock_irqsave(&gameport_event_lock, flags); | |
272 | ||
273 | /* | |
3c803e8e | 274 | * Scan event list for the other events for the same gameport port, |
1da177e4 LT |
275 | * starting with the most recent one. If event is the same we |
276 | * do not need add new one. If event is of different type we | |
277 | * need to add this event and should not look further because | |
278 | * we need to preseve sequence of distinct events. | |
3c803e8e | 279 | */ |
1da177e4 LT |
280 | list_for_each_entry_reverse(event, &gameport_event_list, node) { |
281 | if (event->object == object) { | |
282 | if (event->type == event_type) | |
283 | goto out; | |
284 | break; | |
285 | } | |
286 | } | |
287 | ||
288 | if ((event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC))) { | |
289 | if (!try_module_get(owner)) { | |
290 | printk(KERN_WARNING "gameport: Can't get module reference, dropping event %d\n", event_type); | |
642fde17 | 291 | kfree(event); |
1da177e4 LT |
292 | goto out; |
293 | } | |
294 | ||
295 | event->type = event_type; | |
296 | event->object = object; | |
297 | event->owner = owner; | |
298 | ||
299 | list_add_tail(&event->node, &gameport_event_list); | |
300 | wake_up(&gameport_wait); | |
301 | } else { | |
302 | printk(KERN_ERR "gameport: Not enough memory to queue event %d\n", event_type); | |
303 | } | |
304 | out: | |
305 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
306 | } | |
307 | ||
308 | static void gameport_free_event(struct gameport_event *event) | |
309 | { | |
310 | module_put(event->owner); | |
311 | kfree(event); | |
312 | } | |
313 | ||
314 | static void gameport_remove_duplicate_events(struct gameport_event *event) | |
315 | { | |
316 | struct list_head *node, *next; | |
317 | struct gameport_event *e; | |
318 | unsigned long flags; | |
319 | ||
320 | spin_lock_irqsave(&gameport_event_lock, flags); | |
321 | ||
322 | list_for_each_safe(node, next, &gameport_event_list) { | |
323 | e = list_entry(node, struct gameport_event, node); | |
324 | if (event->object == e->object) { | |
325 | /* | |
326 | * If this event is of different type we should not | |
327 | * look further - we only suppress duplicate events | |
328 | * that were sent back-to-back. | |
329 | */ | |
330 | if (event->type != e->type) | |
331 | break; | |
332 | ||
333 | list_del_init(node); | |
334 | gameport_free_event(e); | |
335 | } | |
336 | } | |
337 | ||
338 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
339 | } | |
340 | ||
1da177e4 LT |
341 | static struct gameport_event *gameport_get_event(void) |
342 | { | |
343 | struct gameport_event *event; | |
344 | struct list_head *node; | |
345 | unsigned long flags; | |
346 | ||
347 | spin_lock_irqsave(&gameport_event_lock, flags); | |
348 | ||
349 | if (list_empty(&gameport_event_list)) { | |
350 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
351 | return NULL; | |
352 | } | |
353 | ||
354 | node = gameport_event_list.next; | |
355 | event = list_entry(node, struct gameport_event, node); | |
356 | list_del_init(node); | |
357 | ||
358 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
359 | ||
360 | return event; | |
361 | } | |
362 | ||
9e50afd0 | 363 | static void gameport_handle_event(void) |
1da177e4 LT |
364 | { |
365 | struct gameport_event *event; | |
1da177e4 | 366 | |
286295eb | 367 | mutex_lock(&gameport_mutex); |
1da177e4 | 368 | |
9e50afd0 DT |
369 | /* |
370 | * Note that we handle only one event here to give swsusp | |
371 | * a chance to freeze kgameportd thread. Gameport events | |
372 | * should be pretty rare so we are not concerned about | |
373 | * taking performance hit. | |
374 | */ | |
375 | if ((event = gameport_get_event())) { | |
1da177e4 LT |
376 | |
377 | switch (event->type) { | |
378 | case GAMEPORT_REGISTER_PORT: | |
379 | gameport_add_port(event->object); | |
380 | break; | |
381 | ||
382 | case GAMEPORT_RECONNECT: | |
383 | gameport_reconnect_port(event->object); | |
384 | break; | |
385 | ||
386 | case GAMEPORT_RESCAN: | |
387 | gameport_disconnect_port(event->object); | |
388 | gameport_find_driver(event->object); | |
389 | break; | |
390 | ||
391 | case GAMEPORT_REGISTER_DRIVER: | |
73b59a3b | 392 | gameport_add_driver(event->object); |
1da177e4 LT |
393 | break; |
394 | ||
395 | default: | |
396 | break; | |
397 | } | |
398 | ||
399 | gameport_remove_duplicate_events(event); | |
400 | gameport_free_event(event); | |
401 | } | |
402 | ||
286295eb | 403 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
407 | * Remove all events that have been submitted for a given gameport port. | |
408 | */ | |
409 | static void gameport_remove_pending_events(struct gameport *gameport) | |
410 | { | |
411 | struct list_head *node, *next; | |
412 | struct gameport_event *event; | |
413 | unsigned long flags; | |
414 | ||
415 | spin_lock_irqsave(&gameport_event_lock, flags); | |
416 | ||
417 | list_for_each_safe(node, next, &gameport_event_list) { | |
418 | event = list_entry(node, struct gameport_event, node); | |
419 | if (event->object == gameport) { | |
420 | list_del_init(node); | |
421 | gameport_free_event(event); | |
422 | } | |
423 | } | |
424 | ||
425 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
426 | } | |
427 | ||
428 | /* | |
429 | * Destroy child gameport port (if any) that has not been fully registered yet. | |
430 | * | |
431 | * Note that we rely on the fact that port can have only one child and therefore | |
432 | * only one child registration request can be pending. Additionally, children | |
433 | * are registered by driver's connect() handler so there can't be a grandchild | |
434 | * pending registration together with a child. | |
435 | */ | |
436 | static struct gameport *gameport_get_pending_child(struct gameport *parent) | |
437 | { | |
438 | struct gameport_event *event; | |
439 | struct gameport *gameport, *child = NULL; | |
440 | unsigned long flags; | |
441 | ||
442 | spin_lock_irqsave(&gameport_event_lock, flags); | |
443 | ||
444 | list_for_each_entry(event, &gameport_event_list, node) { | |
445 | if (event->type == GAMEPORT_REGISTER_PORT) { | |
446 | gameport = event->object; | |
447 | if (gameport->parent == parent) { | |
448 | child = gameport; | |
449 | break; | |
450 | } | |
451 | } | |
452 | } | |
453 | ||
454 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
455 | return child; | |
456 | } | |
457 | ||
458 | static int gameport_thread(void *nothing) | |
459 | { | |
1da177e4 | 460 | do { |
9e50afd0 | 461 | gameport_handle_event(); |
3c803e8e LT |
462 | wait_event_interruptible(gameport_wait, |
463 | kthread_should_stop() || !list_empty(&gameport_event_list)); | |
3e1d1d28 | 464 | try_to_freeze(); |
3c803e8e | 465 | } while (!kthread_should_stop()); |
1da177e4 LT |
466 | |
467 | printk(KERN_DEBUG "gameport: kgameportd exiting\n"); | |
3c803e8e | 468 | return 0; |
1da177e4 LT |
469 | } |
470 | ||
471 | ||
472 | /* | |
473 | * Gameport port operations | |
474 | */ | |
475 | ||
e404e274 | 476 | static ssize_t gameport_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
477 | { |
478 | struct gameport *gameport = to_gameport_port(dev); | |
479 | return sprintf(buf, "%s\n", gameport->name); | |
480 | } | |
481 | ||
e404e274 | 482 | static ssize_t gameport_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
483 | { |
484 | struct gameport *gameport = to_gameport_port(dev); | |
485 | struct device_driver *drv; | |
486 | int retval; | |
487 | ||
286295eb | 488 | retval = mutex_lock_interruptible(&gameport_mutex); |
1da177e4 LT |
489 | if (retval) |
490 | return retval; | |
491 | ||
492 | retval = count; | |
493 | if (!strncmp(buf, "none", count)) { | |
494 | gameport_disconnect_port(gameport); | |
495 | } else if (!strncmp(buf, "reconnect", count)) { | |
496 | gameport_reconnect_port(gameport); | |
497 | } else if (!strncmp(buf, "rescan", count)) { | |
498 | gameport_disconnect_port(gameport); | |
499 | gameport_find_driver(gameport); | |
500 | } else if ((drv = driver_find(buf, &gameport_bus)) != NULL) { | |
501 | gameport_disconnect_port(gameport); | |
502 | gameport_bind_driver(gameport, to_gameport_driver(drv)); | |
503 | put_driver(drv); | |
504 | } else { | |
505 | retval = -EINVAL; | |
506 | } | |
507 | ||
286295eb | 508 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
509 | |
510 | return retval; | |
511 | } | |
512 | ||
513 | static struct device_attribute gameport_device_attrs[] = { | |
514 | __ATTR(description, S_IRUGO, gameport_show_description, NULL), | |
515 | __ATTR(drvctl, S_IWUSR, NULL, gameport_rebind_driver), | |
516 | __ATTR_NULL | |
517 | }; | |
518 | ||
519 | static void gameport_release_port(struct device *dev) | |
520 | { | |
521 | struct gameport *gameport = to_gameport_port(dev); | |
522 | ||
523 | kfree(gameport); | |
524 | module_put(THIS_MODULE); | |
525 | } | |
526 | ||
527 | void gameport_set_phys(struct gameport *gameport, const char *fmt, ...) | |
528 | { | |
529 | va_list args; | |
530 | ||
531 | va_start(args, fmt); | |
532 | vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args); | |
533 | va_end(args); | |
534 | } | |
535 | ||
536 | /* | |
537 | * Prepare gameport port for registration. | |
538 | */ | |
539 | static void gameport_init_port(struct gameport *gameport) | |
540 | { | |
541 | static atomic_t gameport_no = ATOMIC_INIT(0); | |
542 | ||
543 | __module_get(THIS_MODULE); | |
544 | ||
286295eb | 545 | mutex_init(&gameport->drv_mutex); |
1da177e4 LT |
546 | device_initialize(&gameport->dev); |
547 | snprintf(gameport->dev.bus_id, sizeof(gameport->dev.bus_id), | |
548 | "gameport%lu", (unsigned long)atomic_inc_return(&gameport_no) - 1); | |
549 | gameport->dev.bus = &gameport_bus; | |
550 | gameport->dev.release = gameport_release_port; | |
551 | if (gameport->parent) | |
552 | gameport->dev.parent = &gameport->parent->dev; | |
553 | ||
73b59a3b | 554 | INIT_LIST_HEAD(&gameport->node); |
1da177e4 LT |
555 | spin_lock_init(&gameport->timer_lock); |
556 | init_timer(&gameport->poll_timer); | |
557 | gameport->poll_timer.function = gameport_run_poll_handler; | |
558 | gameport->poll_timer.data = (unsigned long)gameport; | |
559 | } | |
560 | ||
561 | /* | |
562 | * Complete gameport port registration. | |
563 | * Driver core will attempt to find appropriate driver for the port. | |
564 | */ | |
565 | static void gameport_add_port(struct gameport *gameport) | |
566 | { | |
73b59a3b RD |
567 | int error; |
568 | ||
1da177e4 LT |
569 | if (gameport->parent) |
570 | gameport->parent->child = gameport; | |
571 | ||
572 | gameport->speed = gameport_measure_speed(gameport); | |
573 | ||
574 | list_add_tail(&gameport->node, &gameport_list); | |
575 | ||
576 | if (gameport->io) | |
577 | printk(KERN_INFO "gameport: %s is %s, io %#x, speed %dkHz\n", | |
578 | gameport->name, gameport->phys, gameport->io, gameport->speed); | |
579 | else | |
580 | printk(KERN_INFO "gameport: %s is %s, speed %dkHz\n", | |
581 | gameport->name, gameport->phys, gameport->speed); | |
582 | ||
73b59a3b RD |
583 | error = device_add(&gameport->dev); |
584 | if (error) | |
585 | printk(KERN_ERR | |
586 | "gameport: device_add() failed for %s (%s), error: %d\n", | |
587 | gameport->phys, gameport->name, error); | |
588 | else | |
589 | gameport->registered = 1; | |
1da177e4 LT |
590 | } |
591 | ||
592 | /* | |
593 | * gameport_destroy_port() completes deregistration process and removes | |
594 | * port from the system | |
595 | */ | |
596 | static void gameport_destroy_port(struct gameport *gameport) | |
597 | { | |
598 | struct gameport *child; | |
599 | ||
600 | child = gameport_get_pending_child(gameport); | |
601 | if (child) { | |
602 | gameport_remove_pending_events(child); | |
603 | put_device(&child->dev); | |
604 | } | |
605 | ||
606 | if (gameport->parent) { | |
607 | gameport->parent->child = NULL; | |
608 | gameport->parent = NULL; | |
609 | } | |
610 | ||
611 | if (gameport->registered) { | |
612 | device_del(&gameport->dev); | |
1da177e4 LT |
613 | gameport->registered = 0; |
614 | } | |
615 | ||
73b59a3b RD |
616 | list_del_init(&gameport->node); |
617 | ||
1da177e4 LT |
618 | gameport_remove_pending_events(gameport); |
619 | put_device(&gameport->dev); | |
620 | } | |
621 | ||
622 | /* | |
623 | * Reconnect gameport port and all its children (re-initialize attached devices) | |
624 | */ | |
625 | static void gameport_reconnect_port(struct gameport *gameport) | |
626 | { | |
627 | do { | |
628 | if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) { | |
629 | gameport_disconnect_port(gameport); | |
630 | gameport_find_driver(gameport); | |
631 | /* Ok, old children are now gone, we are done */ | |
632 | break; | |
633 | } | |
634 | gameport = gameport->child; | |
635 | } while (gameport); | |
636 | } | |
637 | ||
638 | /* | |
639 | * gameport_disconnect_port() unbinds a port from its driver. As a side effect | |
640 | * all child ports are unbound and destroyed. | |
641 | */ | |
642 | static void gameport_disconnect_port(struct gameport *gameport) | |
643 | { | |
644 | struct gameport *s, *parent; | |
645 | ||
646 | if (gameport->child) { | |
647 | /* | |
648 | * Children ports should be disconnected and destroyed | |
649 | * first, staring with the leaf one, since we don't want | |
650 | * to do recursion | |
651 | */ | |
652 | for (s = gameport; s->child; s = s->child) | |
653 | /* empty */; | |
654 | ||
655 | do { | |
656 | parent = s->parent; | |
657 | ||
658 | gameport_release_driver(s); | |
659 | gameport_destroy_port(s); | |
660 | } while ((s = parent) != gameport); | |
661 | } | |
662 | ||
663 | /* | |
664 | * Ok, no children left, now disconnect this port | |
665 | */ | |
666 | gameport_release_driver(gameport); | |
667 | } | |
668 | ||
669 | void gameport_rescan(struct gameport *gameport) | |
670 | { | |
671 | gameport_queue_event(gameport, NULL, GAMEPORT_RESCAN); | |
672 | } | |
673 | ||
674 | void gameport_reconnect(struct gameport *gameport) | |
675 | { | |
676 | gameport_queue_event(gameport, NULL, GAMEPORT_RECONNECT); | |
677 | } | |
678 | ||
679 | /* | |
680 | * Submits register request to kgameportd for subsequent execution. | |
681 | * Note that port registration is always asynchronous. | |
682 | */ | |
683 | void __gameport_register_port(struct gameport *gameport, struct module *owner) | |
684 | { | |
685 | gameport_init_port(gameport); | |
686 | gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT); | |
687 | } | |
688 | ||
689 | /* | |
690 | * Synchronously unregisters gameport port. | |
691 | */ | |
692 | void gameport_unregister_port(struct gameport *gameport) | |
693 | { | |
286295eb | 694 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
695 | gameport_disconnect_port(gameport); |
696 | gameport_destroy_port(gameport); | |
286295eb | 697 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
698 | } |
699 | ||
700 | ||
701 | /* | |
702 | * Gameport driver operations | |
703 | */ | |
704 | ||
705 | static ssize_t gameport_driver_show_description(struct device_driver *drv, char *buf) | |
706 | { | |
707 | struct gameport_driver *driver = to_gameport_driver(drv); | |
708 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
709 | } | |
710 | ||
711 | static struct driver_attribute gameport_driver_attrs[] = { | |
712 | __ATTR(description, S_IRUGO, gameport_driver_show_description, NULL), | |
713 | __ATTR_NULL | |
714 | }; | |
715 | ||
716 | static int gameport_driver_probe(struct device *dev) | |
717 | { | |
718 | struct gameport *gameport = to_gameport_port(dev); | |
719 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
720 | ||
721 | drv->connect(gameport, drv); | |
722 | return gameport->drv ? 0 : -ENODEV; | |
723 | } | |
724 | ||
725 | static int gameport_driver_remove(struct device *dev) | |
726 | { | |
727 | struct gameport *gameport = to_gameport_port(dev); | |
728 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
729 | ||
730 | drv->disconnect(gameport); | |
731 | return 0; | |
732 | } | |
733 | ||
29a4a20e | 734 | static struct bus_type gameport_bus = { |
73b59a3b RD |
735 | .name = "gameport", |
736 | .probe = gameport_driver_probe, | |
737 | .remove = gameport_driver_remove, | |
29a4a20e RK |
738 | }; |
739 | ||
73b59a3b RD |
740 | static void gameport_add_driver(struct gameport_driver *drv) |
741 | { | |
742 | int error; | |
743 | ||
744 | error = driver_register(&drv->driver); | |
745 | if (error) | |
746 | printk(KERN_ERR | |
747 | "gameport: driver_register() failed for %s, error: %d\n", | |
748 | drv->driver.name, error); | |
749 | } | |
750 | ||
1da177e4 LT |
751 | void __gameport_register_driver(struct gameport_driver *drv, struct module *owner) |
752 | { | |
753 | drv->driver.bus = &gameport_bus; | |
1da177e4 LT |
754 | gameport_queue_event(drv, owner, GAMEPORT_REGISTER_DRIVER); |
755 | } | |
756 | ||
757 | void gameport_unregister_driver(struct gameport_driver *drv) | |
758 | { | |
759 | struct gameport *gameport; | |
760 | ||
286295eb | 761 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
762 | drv->ignore = 1; /* so gameport_find_driver ignores it */ |
763 | ||
764 | start_over: | |
765 | list_for_each_entry(gameport, &gameport_list, node) { | |
766 | if (gameport->drv == drv) { | |
767 | gameport_disconnect_port(gameport); | |
768 | gameport_find_driver(gameport); | |
769 | /* we could've deleted some ports, restart */ | |
770 | goto start_over; | |
771 | } | |
772 | } | |
773 | ||
774 | driver_unregister(&drv->driver); | |
286295eb | 775 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
776 | } |
777 | ||
778 | static int gameport_bus_match(struct device *dev, struct device_driver *drv) | |
779 | { | |
780 | struct gameport_driver *gameport_drv = to_gameport_driver(drv); | |
781 | ||
782 | return !gameport_drv->ignore; | |
783 | } | |
784 | ||
785 | static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv) | |
786 | { | |
286295eb | 787 | mutex_lock(&gameport->drv_mutex); |
1da177e4 | 788 | gameport->drv = drv; |
286295eb | 789 | mutex_unlock(&gameport->drv_mutex); |
1da177e4 LT |
790 | } |
791 | ||
792 | int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode) | |
793 | { | |
794 | ||
795 | if (gameport->open) { | |
796 | if (gameport->open(gameport, mode)) { | |
797 | return -1; | |
798 | } | |
799 | } else { | |
800 | if (mode != GAMEPORT_MODE_RAW) | |
801 | return -1; | |
802 | } | |
803 | ||
804 | gameport_set_drv(gameport, drv); | |
805 | return 0; | |
806 | } | |
807 | ||
808 | void gameport_close(struct gameport *gameport) | |
809 | { | |
810 | del_timer_sync(&gameport->poll_timer); | |
811 | gameport->poll_handler = NULL; | |
812 | gameport->poll_interval = 0; | |
813 | gameport_set_drv(gameport, NULL); | |
814 | if (gameport->close) | |
815 | gameport->close(gameport); | |
816 | } | |
817 | ||
818 | static int __init gameport_init(void) | |
819 | { | |
73b59a3b | 820 | int error; |
1da177e4 LT |
821 | |
822 | gameport_bus.dev_attrs = gameport_device_attrs; | |
823 | gameport_bus.drv_attrs = gameport_driver_attrs; | |
824 | gameport_bus.match = gameport_bus_match; | |
73b59a3b RD |
825 | error = bus_register(&gameport_bus); |
826 | if (error) { | |
827 | printk(KERN_ERR "gameport: failed to register gameport bus, error: %d\n", error); | |
828 | return error; | |
829 | } | |
830 | ||
831 | gameport_task = kthread_run(gameport_thread, NULL, "kgameportd"); | |
832 | if (IS_ERR(gameport_task)) { | |
833 | bus_unregister(&gameport_bus); | |
834 | error = PTR_ERR(gameport_task); | |
835 | printk(KERN_ERR "gameport: Failed to start kgameportd, error: %d\n", error); | |
836 | return error; | |
837 | } | |
1da177e4 LT |
838 | |
839 | return 0; | |
840 | } | |
841 | ||
842 | static void __exit gameport_exit(void) | |
843 | { | |
844 | bus_unregister(&gameport_bus); | |
3c803e8e | 845 | kthread_stop(gameport_task); |
1da177e4 LT |
846 | } |
847 | ||
51c38f9b | 848 | subsys_initcall(gameport_init); |
1da177e4 | 849 | module_exit(gameport_exit); |