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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 LT |
20 | #include <linux/slab.h> |
21 | #include <linux/delay.h> | |
3c803e8e | 22 | #include <linux/kthread.h> |
4e57b681 | 23 | #include <linux/sched.h> /* HZ */ |
286295eb | 24 | #include <linux/mutex.h> |
7dfb7103 | 25 | #include <linux/freezer.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); | |
1da177e4 LT |
39 | EXPORT_SYMBOL(gameport_set_phys); |
40 | EXPORT_SYMBOL(gameport_start_polling); | |
41 | EXPORT_SYMBOL(gameport_stop_polling); | |
42 | ||
43 | /* | |
286295eb | 44 | * gameport_mutex protects entire gameport subsystem and is taken |
1da177e4 LT |
45 | * every time gameport port or driver registrered or unregistered. |
46 | */ | |
286295eb | 47 | static DEFINE_MUTEX(gameport_mutex); |
1da177e4 LT |
48 | |
49 | static LIST_HEAD(gameport_list); | |
50 | ||
29a4a20e | 51 | static struct bus_type gameport_bus; |
1da177e4 LT |
52 | |
53 | static void gameport_add_port(struct gameport *gameport); | |
4ced8e7c | 54 | static void gameport_attach_driver(struct gameport_driver *drv); |
1da177e4 LT |
55 | static void gameport_reconnect_port(struct gameport *gameport); |
56 | static void gameport_disconnect_port(struct gameport *gameport); | |
57 | ||
58 | #if defined(__i386__) | |
59 | ||
306e440d IM |
60 | #include <asm/i8253.h> |
61 | ||
1da177e4 LT |
62 | #define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
63 | #define GET_TIME(x) do { x = get_time_pit(); } while (0) | |
64 | ||
65 | static unsigned int get_time_pit(void) | |
66 | { | |
1da177e4 LT |
67 | unsigned long flags; |
68 | unsigned int count; | |
69 | ||
70 | spin_lock_irqsave(&i8253_lock, flags); | |
71 | outb_p(0x00, 0x43); | |
72 | count = inb_p(0x40); | |
73 | count |= inb_p(0x40) << 8; | |
74 | spin_unlock_irqrestore(&i8253_lock, flags); | |
75 | ||
76 | return count; | |
77 | } | |
78 | ||
79 | #endif | |
80 | ||
81 | ||
82 | ||
83 | /* | |
84 | * gameport_measure_speed() measures the gameport i/o speed. | |
85 | */ | |
86 | ||
87 | static int gameport_measure_speed(struct gameport *gameport) | |
88 | { | |
89 | #if defined(__i386__) | |
90 | ||
91 | unsigned int i, t, t1, t2, t3, tx; | |
92 | unsigned long flags; | |
93 | ||
94 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
95 | return 0; | |
96 | ||
97 | tx = 1 << 30; | |
98 | ||
99 | for(i = 0; i < 50; i++) { | |
100 | local_irq_save(flags); | |
101 | GET_TIME(t1); | |
102 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
103 | GET_TIME(t2); | |
104 | GET_TIME(t3); | |
105 | local_irq_restore(flags); | |
106 | udelay(i * 10); | |
107 | if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; | |
108 | } | |
109 | ||
110 | gameport_close(gameport); | |
111 | return 59659 / (tx < 1 ? 1 : tx); | |
112 | ||
113 | #elif defined (__x86_64__) | |
114 | ||
115 | unsigned int i, t; | |
116 | unsigned long tx, t1, t2, flags; | |
117 | ||
118 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
119 | return 0; | |
120 | ||
121 | tx = 1 << 30; | |
122 | ||
123 | for(i = 0; i < 50; i++) { | |
124 | local_irq_save(flags); | |
125 | rdtscl(t1); | |
126 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
127 | rdtscl(t2); | |
128 | local_irq_restore(flags); | |
129 | udelay(i * 10); | |
130 | if (t2 - t1 < tx) tx = t2 - t1; | |
131 | } | |
132 | ||
133 | gameport_close(gameport); | |
92cb7612 MT |
134 | return (cpu_data(raw_smp_processor_id()).loops_per_jiffy * |
135 | (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx); | |
1da177e4 LT |
136 | |
137 | #else | |
138 | ||
139 | unsigned int j, t = 0; | |
140 | ||
141 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
142 | return 0; | |
143 | ||
144 | j = jiffies; while (j == jiffies); | |
145 | j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } | |
146 | ||
147 | gameport_close(gameport); | |
148 | return t * HZ / 1000; | |
149 | ||
150 | #endif | |
151 | } | |
152 | ||
153 | void gameport_start_polling(struct gameport *gameport) | |
154 | { | |
155 | spin_lock(&gameport->timer_lock); | |
156 | ||
157 | if (!gameport->poll_cnt++) { | |
158 | BUG_ON(!gameport->poll_handler); | |
159 | BUG_ON(!gameport->poll_interval); | |
160 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
161 | } | |
162 | ||
163 | spin_unlock(&gameport->timer_lock); | |
164 | } | |
165 | ||
166 | void gameport_stop_polling(struct gameport *gameport) | |
167 | { | |
168 | spin_lock(&gameport->timer_lock); | |
169 | ||
170 | if (!--gameport->poll_cnt) | |
171 | del_timer(&gameport->poll_timer); | |
172 | ||
173 | spin_unlock(&gameport->timer_lock); | |
174 | } | |
175 | ||
176 | static void gameport_run_poll_handler(unsigned long d) | |
177 | { | |
178 | struct gameport *gameport = (struct gameport *)d; | |
179 | ||
180 | gameport->poll_handler(gameport); | |
181 | if (gameport->poll_cnt) | |
182 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
183 | } | |
184 | ||
185 | /* | |
186 | * Basic gameport -> driver core mappings | |
187 | */ | |
188 | ||
79580057 | 189 | static int gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv) |
1da177e4 | 190 | { |
23de1510 DT |
191 | int error; |
192 | ||
1da177e4 LT |
193 | gameport->dev.driver = &drv->driver; |
194 | if (drv->connect(gameport, drv)) { | |
195 | gameport->dev.driver = NULL; | |
79580057 | 196 | return -ENODEV; |
1da177e4 | 197 | } |
23de1510 DT |
198 | |
199 | error = device_bind_driver(&gameport->dev); | |
200 | if (error) { | |
201 | printk(KERN_WARNING | |
202 | "gameport: device_bind_driver() failed " | |
203 | "for %s (%s) and %s, error: %d\n", | |
204 | gameport->phys, gameport->name, | |
205 | drv->description, error); | |
206 | drv->disconnect(gameport); | |
207 | gameport->dev.driver = NULL; | |
79580057 | 208 | return error; |
23de1510 DT |
209 | } |
210 | ||
79580057 | 211 | return 0; |
1da177e4 LT |
212 | } |
213 | ||
214 | static void gameport_find_driver(struct gameport *gameport) | |
215 | { | |
73b59a3b RD |
216 | int error; |
217 | ||
73b59a3b RD |
218 | error = device_attach(&gameport->dev); |
219 | if (error < 0) | |
220 | printk(KERN_WARNING | |
221 | "gameport: device_attach() failed for %s (%s), error: %d\n", | |
222 | gameport->phys, gameport->name, error); | |
1da177e4 LT |
223 | } |
224 | ||
225 | ||
226 | /* | |
227 | * Gameport event processing. | |
228 | */ | |
229 | ||
230 | enum gameport_event_type { | |
1da177e4 | 231 | GAMEPORT_REGISTER_PORT, |
6902c0be | 232 | GAMEPORT_ATTACH_DRIVER, |
1da177e4 LT |
233 | }; |
234 | ||
235 | struct gameport_event { | |
236 | enum gameport_event_type type; | |
237 | void *object; | |
238 | struct module *owner; | |
239 | struct list_head node; | |
240 | }; | |
241 | ||
242 | static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */ | |
243 | static LIST_HEAD(gameport_event_list); | |
244 | static DECLARE_WAIT_QUEUE_HEAD(gameport_wait); | |
3c803e8e | 245 | static struct task_struct *gameport_task; |
1da177e4 | 246 | |
6902c0be DT |
247 | static int gameport_queue_event(void *object, struct module *owner, |
248 | enum gameport_event_type event_type) | |
1da177e4 LT |
249 | { |
250 | unsigned long flags; | |
251 | struct gameport_event *event; | |
6902c0be | 252 | int retval = 0; |
1da177e4 LT |
253 | |
254 | spin_lock_irqsave(&gameport_event_lock, flags); | |
255 | ||
256 | /* | |
3c803e8e | 257 | * Scan event list for the other events for the same gameport port, |
1da177e4 LT |
258 | * starting with the most recent one. If event is the same we |
259 | * do not need add new one. If event is of different type we | |
260 | * need to add this event and should not look further because | |
261 | * we need to preseve sequence of distinct events. | |
3c803e8e | 262 | */ |
1da177e4 LT |
263 | list_for_each_entry_reverse(event, &gameport_event_list, node) { |
264 | if (event->object == object) { | |
265 | if (event->type == event_type) | |
266 | goto out; | |
267 | break; | |
268 | } | |
269 | } | |
270 | ||
6902c0be DT |
271 | event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC); |
272 | if (!event) { | |
273 | printk(KERN_ERR | |
274 | "gameport: Not enough memory to queue event %d\n", | |
275 | event_type); | |
276 | retval = -ENOMEM; | |
277 | goto out; | |
278 | } | |
1da177e4 | 279 | |
6902c0be DT |
280 | if (!try_module_get(owner)) { |
281 | printk(KERN_WARNING | |
282 | "gameport: Can't get module reference, dropping event %d\n", | |
283 | event_type); | |
284 | kfree(event); | |
285 | retval = -EINVAL; | |
286 | goto out; | |
1da177e4 | 287 | } |
6902c0be DT |
288 | |
289 | event->type = event_type; | |
290 | event->object = object; | |
291 | event->owner = owner; | |
292 | ||
293 | list_add_tail(&event->node, &gameport_event_list); | |
294 | wake_up(&gameport_wait); | |
295 | ||
1da177e4 LT |
296 | out: |
297 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
6902c0be | 298 | return retval; |
1da177e4 LT |
299 | } |
300 | ||
301 | static void gameport_free_event(struct gameport_event *event) | |
302 | { | |
303 | module_put(event->owner); | |
304 | kfree(event); | |
305 | } | |
306 | ||
307 | static void gameport_remove_duplicate_events(struct gameport_event *event) | |
308 | { | |
309 | struct list_head *node, *next; | |
310 | struct gameport_event *e; | |
311 | unsigned long flags; | |
312 | ||
313 | spin_lock_irqsave(&gameport_event_lock, flags); | |
314 | ||
315 | list_for_each_safe(node, next, &gameport_event_list) { | |
316 | e = list_entry(node, struct gameport_event, node); | |
317 | if (event->object == e->object) { | |
318 | /* | |
319 | * If this event is of different type we should not | |
320 | * look further - we only suppress duplicate events | |
321 | * that were sent back-to-back. | |
322 | */ | |
323 | if (event->type != e->type) | |
324 | break; | |
325 | ||
326 | list_del_init(node); | |
327 | gameport_free_event(e); | |
328 | } | |
329 | } | |
330 | ||
331 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
332 | } | |
333 | ||
1da177e4 LT |
334 | static struct gameport_event *gameport_get_event(void) |
335 | { | |
336 | struct gameport_event *event; | |
337 | struct list_head *node; | |
338 | unsigned long flags; | |
339 | ||
340 | spin_lock_irqsave(&gameport_event_lock, flags); | |
341 | ||
342 | if (list_empty(&gameport_event_list)) { | |
343 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
344 | return NULL; | |
345 | } | |
346 | ||
347 | node = gameport_event_list.next; | |
348 | event = list_entry(node, struct gameport_event, node); | |
349 | list_del_init(node); | |
350 | ||
351 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
352 | ||
353 | return event; | |
354 | } | |
355 | ||
9e50afd0 | 356 | static void gameport_handle_event(void) |
1da177e4 LT |
357 | { |
358 | struct gameport_event *event; | |
1da177e4 | 359 | |
286295eb | 360 | mutex_lock(&gameport_mutex); |
1da177e4 | 361 | |
9e50afd0 DT |
362 | /* |
363 | * Note that we handle only one event here to give swsusp | |
364 | * a chance to freeze kgameportd thread. Gameport events | |
365 | * should be pretty rare so we are not concerned about | |
366 | * taking performance hit. | |
367 | */ | |
368 | if ((event = gameport_get_event())) { | |
1da177e4 LT |
369 | |
370 | switch (event->type) { | |
371 | case GAMEPORT_REGISTER_PORT: | |
372 | gameport_add_port(event->object); | |
373 | break; | |
374 | ||
4ced8e7c DT |
375 | case GAMEPORT_ATTACH_DRIVER: |
376 | gameport_attach_driver(event->object); | |
1da177e4 LT |
377 | break; |
378 | ||
379 | default: | |
380 | break; | |
381 | } | |
382 | ||
383 | gameport_remove_duplicate_events(event); | |
384 | gameport_free_event(event); | |
385 | } | |
386 | ||
286295eb | 387 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
388 | } |
389 | ||
390 | /* | |
6902c0be DT |
391 | * Remove all events that have been submitted for a given object, |
392 | * be it a gameport port or a driver. | |
1da177e4 | 393 | */ |
6902c0be | 394 | static void gameport_remove_pending_events(void *object) |
1da177e4 LT |
395 | { |
396 | struct list_head *node, *next; | |
397 | struct gameport_event *event; | |
398 | unsigned long flags; | |
399 | ||
400 | spin_lock_irqsave(&gameport_event_lock, flags); | |
401 | ||
402 | list_for_each_safe(node, next, &gameport_event_list) { | |
403 | event = list_entry(node, struct gameport_event, node); | |
6902c0be | 404 | if (event->object == object) { |
1da177e4 LT |
405 | list_del_init(node); |
406 | gameport_free_event(event); | |
407 | } | |
408 | } | |
409 | ||
410 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
411 | } | |
412 | ||
413 | /* | |
414 | * Destroy child gameport port (if any) that has not been fully registered yet. | |
415 | * | |
416 | * Note that we rely on the fact that port can have only one child and therefore | |
417 | * only one child registration request can be pending. Additionally, children | |
418 | * are registered by driver's connect() handler so there can't be a grandchild | |
419 | * pending registration together with a child. | |
420 | */ | |
421 | static struct gameport *gameport_get_pending_child(struct gameport *parent) | |
422 | { | |
423 | struct gameport_event *event; | |
424 | struct gameport *gameport, *child = NULL; | |
425 | unsigned long flags; | |
426 | ||
427 | spin_lock_irqsave(&gameport_event_lock, flags); | |
428 | ||
429 | list_for_each_entry(event, &gameport_event_list, node) { | |
430 | if (event->type == GAMEPORT_REGISTER_PORT) { | |
431 | gameport = event->object; | |
432 | if (gameport->parent == parent) { | |
433 | child = gameport; | |
434 | break; | |
435 | } | |
436 | } | |
437 | } | |
438 | ||
439 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
440 | return child; | |
441 | } | |
442 | ||
443 | static int gameport_thread(void *nothing) | |
444 | { | |
83144186 | 445 | set_freezable(); |
1da177e4 | 446 | do { |
9e50afd0 | 447 | gameport_handle_event(); |
e42837bc | 448 | wait_event_freezable(gameport_wait, |
3c803e8e | 449 | kthread_should_stop() || !list_empty(&gameport_event_list)); |
3c803e8e | 450 | } while (!kthread_should_stop()); |
1da177e4 LT |
451 | |
452 | printk(KERN_DEBUG "gameport: kgameportd exiting\n"); | |
3c803e8e | 453 | return 0; |
1da177e4 LT |
454 | } |
455 | ||
456 | ||
457 | /* | |
458 | * Gameport port operations | |
459 | */ | |
460 | ||
e404e274 | 461 | static ssize_t gameport_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
462 | { |
463 | struct gameport *gameport = to_gameport_port(dev); | |
464 | return sprintf(buf, "%s\n", gameport->name); | |
465 | } | |
466 | ||
e404e274 | 467 | static ssize_t gameport_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
468 | { |
469 | struct gameport *gameport = to_gameport_port(dev); | |
470 | struct device_driver *drv; | |
79580057 | 471 | int error; |
1da177e4 | 472 | |
79580057 DT |
473 | error = mutex_lock_interruptible(&gameport_mutex); |
474 | if (error) | |
475 | return error; | |
1da177e4 | 476 | |
1da177e4 LT |
477 | if (!strncmp(buf, "none", count)) { |
478 | gameport_disconnect_port(gameport); | |
479 | } else if (!strncmp(buf, "reconnect", count)) { | |
480 | gameport_reconnect_port(gameport); | |
481 | } else if (!strncmp(buf, "rescan", count)) { | |
482 | gameport_disconnect_port(gameport); | |
483 | gameport_find_driver(gameport); | |
484 | } else if ((drv = driver_find(buf, &gameport_bus)) != NULL) { | |
485 | gameport_disconnect_port(gameport); | |
79580057 | 486 | error = gameport_bind_driver(gameport, to_gameport_driver(drv)); |
1da177e4 LT |
487 | put_driver(drv); |
488 | } else { | |
79580057 | 489 | error = -EINVAL; |
1da177e4 LT |
490 | } |
491 | ||
286295eb | 492 | mutex_unlock(&gameport_mutex); |
1da177e4 | 493 | |
79580057 | 494 | return error ? error : count; |
1da177e4 LT |
495 | } |
496 | ||
497 | static struct device_attribute gameport_device_attrs[] = { | |
498 | __ATTR(description, S_IRUGO, gameport_show_description, NULL), | |
499 | __ATTR(drvctl, S_IWUSR, NULL, gameport_rebind_driver), | |
500 | __ATTR_NULL | |
501 | }; | |
502 | ||
503 | static void gameport_release_port(struct device *dev) | |
504 | { | |
505 | struct gameport *gameport = to_gameport_port(dev); | |
506 | ||
507 | kfree(gameport); | |
508 | module_put(THIS_MODULE); | |
509 | } | |
510 | ||
511 | void gameport_set_phys(struct gameport *gameport, const char *fmt, ...) | |
512 | { | |
513 | va_list args; | |
514 | ||
515 | va_start(args, fmt); | |
516 | vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args); | |
517 | va_end(args); | |
518 | } | |
519 | ||
520 | /* | |
521 | * Prepare gameport port for registration. | |
522 | */ | |
523 | static void gameport_init_port(struct gameport *gameport) | |
524 | { | |
525 | static atomic_t gameport_no = ATOMIC_INIT(0); | |
526 | ||
527 | __module_get(THIS_MODULE); | |
528 | ||
286295eb | 529 | mutex_init(&gameport->drv_mutex); |
1da177e4 | 530 | device_initialize(&gameport->dev); |
a6c2490f | 531 | dev_set_name(&gameport->dev, "gameport%lu", (unsigned long)atomic_inc_return(&gameport_no) - 1); |
1da177e4 LT |
532 | gameport->dev.bus = &gameport_bus; |
533 | gameport->dev.release = gameport_release_port; | |
534 | if (gameport->parent) | |
535 | gameport->dev.parent = &gameport->parent->dev; | |
536 | ||
73b59a3b | 537 | INIT_LIST_HEAD(&gameport->node); |
1da177e4 LT |
538 | spin_lock_init(&gameport->timer_lock); |
539 | init_timer(&gameport->poll_timer); | |
540 | gameport->poll_timer.function = gameport_run_poll_handler; | |
541 | gameport->poll_timer.data = (unsigned long)gameport; | |
542 | } | |
543 | ||
544 | /* | |
545 | * Complete gameport port registration. | |
546 | * Driver core will attempt to find appropriate driver for the port. | |
547 | */ | |
548 | static void gameport_add_port(struct gameport *gameport) | |
549 | { | |
73b59a3b RD |
550 | int error; |
551 | ||
1da177e4 LT |
552 | if (gameport->parent) |
553 | gameport->parent->child = gameport; | |
554 | ||
555 | gameport->speed = gameport_measure_speed(gameport); | |
556 | ||
557 | list_add_tail(&gameport->node, &gameport_list); | |
558 | ||
559 | if (gameport->io) | |
560 | printk(KERN_INFO "gameport: %s is %s, io %#x, speed %dkHz\n", | |
561 | gameport->name, gameport->phys, gameport->io, gameport->speed); | |
562 | else | |
563 | printk(KERN_INFO "gameport: %s is %s, speed %dkHz\n", | |
564 | gameport->name, gameport->phys, gameport->speed); | |
565 | ||
73b59a3b RD |
566 | error = device_add(&gameport->dev); |
567 | if (error) | |
568 | printk(KERN_ERR | |
569 | "gameport: device_add() failed for %s (%s), error: %d\n", | |
570 | gameport->phys, gameport->name, error); | |
571 | else | |
572 | gameport->registered = 1; | |
1da177e4 LT |
573 | } |
574 | ||
575 | /* | |
576 | * gameport_destroy_port() completes deregistration process and removes | |
577 | * port from the system | |
578 | */ | |
579 | static void gameport_destroy_port(struct gameport *gameport) | |
580 | { | |
581 | struct gameport *child; | |
582 | ||
583 | child = gameport_get_pending_child(gameport); | |
584 | if (child) { | |
585 | gameport_remove_pending_events(child); | |
586 | put_device(&child->dev); | |
587 | } | |
588 | ||
589 | if (gameport->parent) { | |
590 | gameport->parent->child = NULL; | |
591 | gameport->parent = NULL; | |
592 | } | |
593 | ||
594 | if (gameport->registered) { | |
595 | device_del(&gameport->dev); | |
1da177e4 LT |
596 | gameport->registered = 0; |
597 | } | |
598 | ||
73b59a3b RD |
599 | list_del_init(&gameport->node); |
600 | ||
1da177e4 LT |
601 | gameport_remove_pending_events(gameport); |
602 | put_device(&gameport->dev); | |
603 | } | |
604 | ||
605 | /* | |
606 | * Reconnect gameport port and all its children (re-initialize attached devices) | |
607 | */ | |
608 | static void gameport_reconnect_port(struct gameport *gameport) | |
609 | { | |
610 | do { | |
611 | if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) { | |
612 | gameport_disconnect_port(gameport); | |
613 | gameport_find_driver(gameport); | |
614 | /* Ok, old children are now gone, we are done */ | |
615 | break; | |
616 | } | |
617 | gameport = gameport->child; | |
618 | } while (gameport); | |
619 | } | |
620 | ||
621 | /* | |
622 | * gameport_disconnect_port() unbinds a port from its driver. As a side effect | |
623 | * all child ports are unbound and destroyed. | |
624 | */ | |
625 | static void gameport_disconnect_port(struct gameport *gameport) | |
626 | { | |
627 | struct gameport *s, *parent; | |
628 | ||
629 | if (gameport->child) { | |
630 | /* | |
631 | * Children ports should be disconnected and destroyed | |
632 | * first, staring with the leaf one, since we don't want | |
633 | * to do recursion | |
634 | */ | |
635 | for (s = gameport; s->child; s = s->child) | |
636 | /* empty */; | |
637 | ||
638 | do { | |
639 | parent = s->parent; | |
640 | ||
79580057 | 641 | device_release_driver(&s->dev); |
1da177e4 LT |
642 | gameport_destroy_port(s); |
643 | } while ((s = parent) != gameport); | |
644 | } | |
645 | ||
646 | /* | |
647 | * Ok, no children left, now disconnect this port | |
648 | */ | |
79580057 | 649 | device_release_driver(&gameport->dev); |
1da177e4 LT |
650 | } |
651 | ||
1da177e4 LT |
652 | /* |
653 | * Submits register request to kgameportd for subsequent execution. | |
654 | * Note that port registration is always asynchronous. | |
655 | */ | |
656 | void __gameport_register_port(struct gameport *gameport, struct module *owner) | |
657 | { | |
658 | gameport_init_port(gameport); | |
659 | gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT); | |
660 | } | |
661 | ||
662 | /* | |
663 | * Synchronously unregisters gameport port. | |
664 | */ | |
665 | void gameport_unregister_port(struct gameport *gameport) | |
666 | { | |
286295eb | 667 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
668 | gameport_disconnect_port(gameport); |
669 | gameport_destroy_port(gameport); | |
286295eb | 670 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
671 | } |
672 | ||
673 | ||
674 | /* | |
675 | * Gameport driver operations | |
676 | */ | |
677 | ||
678 | static ssize_t gameport_driver_show_description(struct device_driver *drv, char *buf) | |
679 | { | |
680 | struct gameport_driver *driver = to_gameport_driver(drv); | |
681 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
682 | } | |
683 | ||
684 | static struct driver_attribute gameport_driver_attrs[] = { | |
685 | __ATTR(description, S_IRUGO, gameport_driver_show_description, NULL), | |
686 | __ATTR_NULL | |
687 | }; | |
688 | ||
689 | static int gameport_driver_probe(struct device *dev) | |
690 | { | |
691 | struct gameport *gameport = to_gameport_port(dev); | |
692 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
693 | ||
694 | drv->connect(gameport, drv); | |
695 | return gameport->drv ? 0 : -ENODEV; | |
696 | } | |
697 | ||
698 | static int gameport_driver_remove(struct device *dev) | |
699 | { | |
700 | struct gameport *gameport = to_gameport_port(dev); | |
701 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
702 | ||
703 | drv->disconnect(gameport); | |
704 | return 0; | |
705 | } | |
706 | ||
4ced8e7c | 707 | static void gameport_attach_driver(struct gameport_driver *drv) |
73b59a3b RD |
708 | { |
709 | int error; | |
710 | ||
4ced8e7c | 711 | error = driver_attach(&drv->driver); |
73b59a3b RD |
712 | if (error) |
713 | printk(KERN_ERR | |
4ced8e7c | 714 | "gameport: driver_attach() failed for %s, error: %d\n", |
73b59a3b RD |
715 | drv->driver.name, error); |
716 | } | |
717 | ||
6902c0be DT |
718 | int __gameport_register_driver(struct gameport_driver *drv, struct module *owner, |
719 | const char *mod_name) | |
1da177e4 | 720 | { |
6902c0be DT |
721 | int error; |
722 | ||
1da177e4 | 723 | drv->driver.bus = &gameport_bus; |
6902c0be DT |
724 | drv->driver.owner = owner; |
725 | drv->driver.mod_name = mod_name; | |
726 | ||
727 | /* | |
728 | * Temporarily disable automatic binding because probing | |
729 | * takes long time and we are better off doing it in kgameportd | |
730 | */ | |
731 | drv->ignore = 1; | |
732 | ||
733 | error = driver_register(&drv->driver); | |
734 | if (error) { | |
735 | printk(KERN_ERR | |
736 | "gameport: driver_register() failed for %s, error: %d\n", | |
737 | drv->driver.name, error); | |
738 | return error; | |
739 | } | |
740 | ||
741 | /* | |
742 | * Reset ignore flag and let kgameportd bind the driver to free ports | |
743 | */ | |
744 | drv->ignore = 0; | |
745 | error = gameport_queue_event(drv, NULL, GAMEPORT_ATTACH_DRIVER); | |
746 | if (error) { | |
747 | driver_unregister(&drv->driver); | |
748 | return error; | |
749 | } | |
750 | ||
751 | return 0; | |
1da177e4 LT |
752 | } |
753 | ||
754 | void gameport_unregister_driver(struct gameport_driver *drv) | |
755 | { | |
756 | struct gameport *gameport; | |
757 | ||
286295eb | 758 | mutex_lock(&gameport_mutex); |
6902c0be | 759 | |
1da177e4 | 760 | drv->ignore = 1; /* so gameport_find_driver ignores it */ |
6902c0be | 761 | gameport_remove_pending_events(drv); |
1da177e4 LT |
762 | |
763 | start_over: | |
764 | list_for_each_entry(gameport, &gameport_list, node) { | |
765 | if (gameport->drv == drv) { | |
766 | gameport_disconnect_port(gameport); | |
767 | gameport_find_driver(gameport); | |
768 | /* we could've deleted some ports, restart */ | |
769 | goto start_over; | |
770 | } | |
771 | } | |
772 | ||
773 | driver_unregister(&drv->driver); | |
6902c0be | 774 | |
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 | ||
b187dd7b DT |
785 | static struct bus_type gameport_bus = { |
786 | .name = "gameport", | |
787 | .dev_attrs = gameport_device_attrs, | |
788 | .drv_attrs = gameport_driver_attrs, | |
789 | .match = gameport_bus_match, | |
790 | .probe = gameport_driver_probe, | |
791 | .remove = gameport_driver_remove, | |
792 | }; | |
793 | ||
1da177e4 LT |
794 | static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv) |
795 | { | |
286295eb | 796 | mutex_lock(&gameport->drv_mutex); |
1da177e4 | 797 | gameport->drv = drv; |
286295eb | 798 | mutex_unlock(&gameport->drv_mutex); |
1da177e4 LT |
799 | } |
800 | ||
801 | int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode) | |
802 | { | |
1da177e4 LT |
803 | if (gameport->open) { |
804 | if (gameport->open(gameport, mode)) { | |
805 | return -1; | |
806 | } | |
807 | } else { | |
808 | if (mode != GAMEPORT_MODE_RAW) | |
809 | return -1; | |
810 | } | |
811 | ||
812 | gameport_set_drv(gameport, drv); | |
813 | return 0; | |
814 | } | |
815 | ||
816 | void gameport_close(struct gameport *gameport) | |
817 | { | |
818 | del_timer_sync(&gameport->poll_timer); | |
819 | gameport->poll_handler = NULL; | |
820 | gameport->poll_interval = 0; | |
821 | gameport_set_drv(gameport, NULL); | |
822 | if (gameport->close) | |
823 | gameport->close(gameport); | |
824 | } | |
825 | ||
826 | static int __init gameport_init(void) | |
827 | { | |
73b59a3b | 828 | int error; |
1da177e4 | 829 | |
73b59a3b RD |
830 | error = bus_register(&gameport_bus); |
831 | if (error) { | |
832 | printk(KERN_ERR "gameport: failed to register gameport bus, error: %d\n", error); | |
833 | return error; | |
834 | } | |
835 | ||
836 | gameport_task = kthread_run(gameport_thread, NULL, "kgameportd"); | |
837 | if (IS_ERR(gameport_task)) { | |
838 | bus_unregister(&gameport_bus); | |
839 | error = PTR_ERR(gameport_task); | |
840 | printk(KERN_ERR "gameport: Failed to start kgameportd, error: %d\n", error); | |
841 | return error; | |
842 | } | |
1da177e4 LT |
843 | |
844 | return 0; | |
845 | } | |
846 | ||
847 | static void __exit gameport_exit(void) | |
848 | { | |
849 | bus_unregister(&gameport_bus); | |
3c803e8e | 850 | kthread_stop(gameport_task); |
1da177e4 LT |
851 | } |
852 | ||
51c38f9b | 853 | subsys_initcall(gameport_init); |
1da177e4 | 854 | module_exit(gameport_exit); |