Commit | Line | Data |
---|---|---|
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 | 52 | |
73b59a3b | 53 | static void gameport_add_driver(struct gameport_driver *drv); |
1da177e4 LT |
54 | static void gameport_add_port(struct gameport *gameport); |
55 | static void gameport_destroy_port(struct gameport *gameport); | |
56 | static void gameport_reconnect_port(struct gameport *gameport); | |
57 | static void gameport_disconnect_port(struct gameport *gameport); | |
58 | ||
59 | #if defined(__i386__) | |
60 | ||
306e440d IM |
61 | #include <asm/i8253.h> |
62 | ||
1da177e4 LT |
63 | #define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
64 | #define GET_TIME(x) do { x = get_time_pit(); } while (0) | |
65 | ||
66 | static unsigned int get_time_pit(void) | |
67 | { | |
1da177e4 LT |
68 | unsigned long flags; |
69 | unsigned int count; | |
70 | ||
71 | spin_lock_irqsave(&i8253_lock, flags); | |
72 | outb_p(0x00, 0x43); | |
73 | count = inb_p(0x40); | |
74 | count |= inb_p(0x40) << 8; | |
75 | spin_unlock_irqrestore(&i8253_lock, flags); | |
76 | ||
77 | return count; | |
78 | } | |
79 | ||
80 | #endif | |
81 | ||
82 | ||
83 | ||
84 | /* | |
85 | * gameport_measure_speed() measures the gameport i/o speed. | |
86 | */ | |
87 | ||
88 | static int gameport_measure_speed(struct gameport *gameport) | |
89 | { | |
90 | #if defined(__i386__) | |
91 | ||
92 | unsigned int i, t, t1, t2, t3, tx; | |
93 | unsigned long flags; | |
94 | ||
95 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
96 | return 0; | |
97 | ||
98 | tx = 1 << 30; | |
99 | ||
100 | for(i = 0; i < 50; i++) { | |
101 | local_irq_save(flags); | |
102 | GET_TIME(t1); | |
103 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
104 | GET_TIME(t2); | |
105 | GET_TIME(t3); | |
106 | local_irq_restore(flags); | |
107 | udelay(i * 10); | |
108 | if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; | |
109 | } | |
110 | ||
111 | gameport_close(gameport); | |
112 | return 59659 / (tx < 1 ? 1 : tx); | |
113 | ||
114 | #elif defined (__x86_64__) | |
115 | ||
116 | unsigned int i, t; | |
117 | unsigned long tx, t1, t2, flags; | |
118 | ||
119 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
120 | return 0; | |
121 | ||
122 | tx = 1 << 30; | |
123 | ||
124 | for(i = 0; i < 50; i++) { | |
125 | local_irq_save(flags); | |
126 | rdtscl(t1); | |
127 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
128 | rdtscl(t2); | |
129 | local_irq_restore(flags); | |
130 | udelay(i * 10); | |
131 | if (t2 - t1 < tx) tx = t2 - t1; | |
132 | } | |
133 | ||
134 | gameport_close(gameport); | |
92cb7612 MT |
135 | return (cpu_data(raw_smp_processor_id()).loops_per_jiffy * |
136 | (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx); | |
1da177e4 LT |
137 | |
138 | #else | |
139 | ||
140 | unsigned int j, t = 0; | |
141 | ||
142 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
143 | return 0; | |
144 | ||
145 | j = jiffies; while (j == jiffies); | |
146 | j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } | |
147 | ||
148 | gameport_close(gameport); | |
149 | return t * HZ / 1000; | |
150 | ||
151 | #endif | |
152 | } | |
153 | ||
154 | void gameport_start_polling(struct gameport *gameport) | |
155 | { | |
156 | spin_lock(&gameport->timer_lock); | |
157 | ||
158 | if (!gameport->poll_cnt++) { | |
159 | BUG_ON(!gameport->poll_handler); | |
160 | BUG_ON(!gameport->poll_interval); | |
161 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
162 | } | |
163 | ||
164 | spin_unlock(&gameport->timer_lock); | |
165 | } | |
166 | ||
167 | void gameport_stop_polling(struct gameport *gameport) | |
168 | { | |
169 | spin_lock(&gameport->timer_lock); | |
170 | ||
171 | if (!--gameport->poll_cnt) | |
172 | del_timer(&gameport->poll_timer); | |
173 | ||
174 | spin_unlock(&gameport->timer_lock); | |
175 | } | |
176 | ||
177 | static void gameport_run_poll_handler(unsigned long d) | |
178 | { | |
179 | struct gameport *gameport = (struct gameport *)d; | |
180 | ||
181 | gameport->poll_handler(gameport); | |
182 | if (gameport->poll_cnt) | |
183 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
184 | } | |
185 | ||
186 | /* | |
187 | * Basic gameport -> driver core mappings | |
188 | */ | |
189 | ||
79580057 | 190 | static int gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv) |
1da177e4 | 191 | { |
23de1510 DT |
192 | int error; |
193 | ||
1da177e4 LT |
194 | gameport->dev.driver = &drv->driver; |
195 | if (drv->connect(gameport, drv)) { | |
196 | gameport->dev.driver = NULL; | |
79580057 | 197 | return -ENODEV; |
1da177e4 | 198 | } |
23de1510 DT |
199 | |
200 | error = device_bind_driver(&gameport->dev); | |
201 | if (error) { | |
202 | printk(KERN_WARNING | |
203 | "gameport: device_bind_driver() failed " | |
204 | "for %s (%s) and %s, error: %d\n", | |
205 | gameport->phys, gameport->name, | |
206 | drv->description, error); | |
207 | drv->disconnect(gameport); | |
208 | gameport->dev.driver = NULL; | |
79580057 | 209 | return error; |
23de1510 DT |
210 | } |
211 | ||
79580057 | 212 | return 0; |
1da177e4 LT |
213 | } |
214 | ||
215 | static void gameport_find_driver(struct gameport *gameport) | |
216 | { | |
73b59a3b RD |
217 | int error; |
218 | ||
73b59a3b RD |
219 | error = device_attach(&gameport->dev); |
220 | if (error < 0) | |
221 | printk(KERN_WARNING | |
222 | "gameport: device_attach() failed for %s (%s), error: %d\n", | |
223 | gameport->phys, gameport->name, error); | |
1da177e4 LT |
224 | } |
225 | ||
226 | ||
227 | /* | |
228 | * Gameport event processing. | |
229 | */ | |
230 | ||
231 | enum gameport_event_type { | |
1da177e4 LT |
232 | GAMEPORT_REGISTER_PORT, |
233 | GAMEPORT_REGISTER_DRIVER, | |
234 | }; | |
235 | ||
236 | struct gameport_event { | |
237 | enum gameport_event_type type; | |
238 | void *object; | |
239 | struct module *owner; | |
240 | struct list_head node; | |
241 | }; | |
242 | ||
243 | static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */ | |
244 | static LIST_HEAD(gameport_event_list); | |
245 | static DECLARE_WAIT_QUEUE_HEAD(gameport_wait); | |
3c803e8e | 246 | static struct task_struct *gameport_task; |
1da177e4 LT |
247 | |
248 | static void gameport_queue_event(void *object, struct module *owner, | |
249 | enum gameport_event_type event_type) | |
250 | { | |
251 | unsigned long flags; | |
252 | struct gameport_event *event; | |
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 | ||
271 | if ((event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC))) { | |
272 | if (!try_module_get(owner)) { | |
273 | printk(KERN_WARNING "gameport: Can't get module reference, dropping event %d\n", event_type); | |
642fde17 | 274 | kfree(event); |
1da177e4 LT |
275 | goto out; |
276 | } | |
277 | ||
278 | event->type = event_type; | |
279 | event->object = object; | |
280 | event->owner = owner; | |
281 | ||
282 | list_add_tail(&event->node, &gameport_event_list); | |
283 | wake_up(&gameport_wait); | |
284 | } else { | |
285 | printk(KERN_ERR "gameport: Not enough memory to queue event %d\n", event_type); | |
286 | } | |
287 | out: | |
288 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
289 | } | |
290 | ||
291 | static void gameport_free_event(struct gameport_event *event) | |
292 | { | |
293 | module_put(event->owner); | |
294 | kfree(event); | |
295 | } | |
296 | ||
297 | static void gameport_remove_duplicate_events(struct gameport_event *event) | |
298 | { | |
299 | struct list_head *node, *next; | |
300 | struct gameport_event *e; | |
301 | unsigned long flags; | |
302 | ||
303 | spin_lock_irqsave(&gameport_event_lock, flags); | |
304 | ||
305 | list_for_each_safe(node, next, &gameport_event_list) { | |
306 | e = list_entry(node, struct gameport_event, node); | |
307 | if (event->object == e->object) { | |
308 | /* | |
309 | * If this event is of different type we should not | |
310 | * look further - we only suppress duplicate events | |
311 | * that were sent back-to-back. | |
312 | */ | |
313 | if (event->type != e->type) | |
314 | break; | |
315 | ||
316 | list_del_init(node); | |
317 | gameport_free_event(e); | |
318 | } | |
319 | } | |
320 | ||
321 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
322 | } | |
323 | ||
1da177e4 LT |
324 | static struct gameport_event *gameport_get_event(void) |
325 | { | |
326 | struct gameport_event *event; | |
327 | struct list_head *node; | |
328 | unsigned long flags; | |
329 | ||
330 | spin_lock_irqsave(&gameport_event_lock, flags); | |
331 | ||
332 | if (list_empty(&gameport_event_list)) { | |
333 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
334 | return NULL; | |
335 | } | |
336 | ||
337 | node = gameport_event_list.next; | |
338 | event = list_entry(node, struct gameport_event, node); | |
339 | list_del_init(node); | |
340 | ||
341 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
342 | ||
343 | return event; | |
344 | } | |
345 | ||
9e50afd0 | 346 | static void gameport_handle_event(void) |
1da177e4 LT |
347 | { |
348 | struct gameport_event *event; | |
1da177e4 | 349 | |
286295eb | 350 | mutex_lock(&gameport_mutex); |
1da177e4 | 351 | |
9e50afd0 DT |
352 | /* |
353 | * Note that we handle only one event here to give swsusp | |
354 | * a chance to freeze kgameportd thread. Gameport events | |
355 | * should be pretty rare so we are not concerned about | |
356 | * taking performance hit. | |
357 | */ | |
358 | if ((event = gameport_get_event())) { | |
1da177e4 LT |
359 | |
360 | switch (event->type) { | |
361 | case GAMEPORT_REGISTER_PORT: | |
362 | gameport_add_port(event->object); | |
363 | break; | |
364 | ||
1da177e4 | 365 | case GAMEPORT_REGISTER_DRIVER: |
73b59a3b | 366 | gameport_add_driver(event->object); |
1da177e4 LT |
367 | break; |
368 | ||
369 | default: | |
370 | break; | |
371 | } | |
372 | ||
373 | gameport_remove_duplicate_events(event); | |
374 | gameport_free_event(event); | |
375 | } | |
376 | ||
286295eb | 377 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
378 | } |
379 | ||
380 | /* | |
381 | * Remove all events that have been submitted for a given gameport port. | |
382 | */ | |
383 | static void gameport_remove_pending_events(struct gameport *gameport) | |
384 | { | |
385 | struct list_head *node, *next; | |
386 | struct gameport_event *event; | |
387 | unsigned long flags; | |
388 | ||
389 | spin_lock_irqsave(&gameport_event_lock, flags); | |
390 | ||
391 | list_for_each_safe(node, next, &gameport_event_list) { | |
392 | event = list_entry(node, struct gameport_event, node); | |
393 | if (event->object == gameport) { | |
394 | list_del_init(node); | |
395 | gameport_free_event(event); | |
396 | } | |
397 | } | |
398 | ||
399 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
400 | } | |
401 | ||
402 | /* | |
403 | * Destroy child gameport port (if any) that has not been fully registered yet. | |
404 | * | |
405 | * Note that we rely on the fact that port can have only one child and therefore | |
406 | * only one child registration request can be pending. Additionally, children | |
407 | * are registered by driver's connect() handler so there can't be a grandchild | |
408 | * pending registration together with a child. | |
409 | */ | |
410 | static struct gameport *gameport_get_pending_child(struct gameport *parent) | |
411 | { | |
412 | struct gameport_event *event; | |
413 | struct gameport *gameport, *child = NULL; | |
414 | unsigned long flags; | |
415 | ||
416 | spin_lock_irqsave(&gameport_event_lock, flags); | |
417 | ||
418 | list_for_each_entry(event, &gameport_event_list, node) { | |
419 | if (event->type == GAMEPORT_REGISTER_PORT) { | |
420 | gameport = event->object; | |
421 | if (gameport->parent == parent) { | |
422 | child = gameport; | |
423 | break; | |
424 | } | |
425 | } | |
426 | } | |
427 | ||
428 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
429 | return child; | |
430 | } | |
431 | ||
432 | static int gameport_thread(void *nothing) | |
433 | { | |
83144186 | 434 | set_freezable(); |
1da177e4 | 435 | do { |
9e50afd0 | 436 | gameport_handle_event(); |
e42837bc | 437 | wait_event_freezable(gameport_wait, |
3c803e8e | 438 | kthread_should_stop() || !list_empty(&gameport_event_list)); |
3c803e8e | 439 | } while (!kthread_should_stop()); |
1da177e4 LT |
440 | |
441 | printk(KERN_DEBUG "gameport: kgameportd exiting\n"); | |
3c803e8e | 442 | return 0; |
1da177e4 LT |
443 | } |
444 | ||
445 | ||
446 | /* | |
447 | * Gameport port operations | |
448 | */ | |
449 | ||
e404e274 | 450 | static ssize_t gameport_show_description(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
451 | { |
452 | struct gameport *gameport = to_gameport_port(dev); | |
453 | return sprintf(buf, "%s\n", gameport->name); | |
454 | } | |
455 | ||
e404e274 | 456 | static ssize_t gameport_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
457 | { |
458 | struct gameport *gameport = to_gameport_port(dev); | |
459 | struct device_driver *drv; | |
79580057 | 460 | int error; |
1da177e4 | 461 | |
79580057 DT |
462 | error = mutex_lock_interruptible(&gameport_mutex); |
463 | if (error) | |
464 | return error; | |
1da177e4 | 465 | |
1da177e4 LT |
466 | if (!strncmp(buf, "none", count)) { |
467 | gameport_disconnect_port(gameport); | |
468 | } else if (!strncmp(buf, "reconnect", count)) { | |
469 | gameport_reconnect_port(gameport); | |
470 | } else if (!strncmp(buf, "rescan", count)) { | |
471 | gameport_disconnect_port(gameport); | |
472 | gameport_find_driver(gameport); | |
473 | } else if ((drv = driver_find(buf, &gameport_bus)) != NULL) { | |
474 | gameport_disconnect_port(gameport); | |
79580057 | 475 | error = gameport_bind_driver(gameport, to_gameport_driver(drv)); |
1da177e4 LT |
476 | put_driver(drv); |
477 | } else { | |
79580057 | 478 | error = -EINVAL; |
1da177e4 LT |
479 | } |
480 | ||
286295eb | 481 | mutex_unlock(&gameport_mutex); |
1da177e4 | 482 | |
79580057 | 483 | return error ? error : count; |
1da177e4 LT |
484 | } |
485 | ||
486 | static struct device_attribute gameport_device_attrs[] = { | |
487 | __ATTR(description, S_IRUGO, gameport_show_description, NULL), | |
488 | __ATTR(drvctl, S_IWUSR, NULL, gameport_rebind_driver), | |
489 | __ATTR_NULL | |
490 | }; | |
491 | ||
492 | static void gameport_release_port(struct device *dev) | |
493 | { | |
494 | struct gameport *gameport = to_gameport_port(dev); | |
495 | ||
496 | kfree(gameport); | |
497 | module_put(THIS_MODULE); | |
498 | } | |
499 | ||
500 | void gameport_set_phys(struct gameport *gameport, const char *fmt, ...) | |
501 | { | |
502 | va_list args; | |
503 | ||
504 | va_start(args, fmt); | |
505 | vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args); | |
506 | va_end(args); | |
507 | } | |
508 | ||
509 | /* | |
510 | * Prepare gameport port for registration. | |
511 | */ | |
512 | static void gameport_init_port(struct gameport *gameport) | |
513 | { | |
514 | static atomic_t gameport_no = ATOMIC_INIT(0); | |
515 | ||
516 | __module_get(THIS_MODULE); | |
517 | ||
286295eb | 518 | mutex_init(&gameport->drv_mutex); |
1da177e4 LT |
519 | device_initialize(&gameport->dev); |
520 | snprintf(gameport->dev.bus_id, sizeof(gameport->dev.bus_id), | |
521 | "gameport%lu", (unsigned long)atomic_inc_return(&gameport_no) - 1); | |
522 | gameport->dev.bus = &gameport_bus; | |
523 | gameport->dev.release = gameport_release_port; | |
524 | if (gameport->parent) | |
525 | gameport->dev.parent = &gameport->parent->dev; | |
526 | ||
73b59a3b | 527 | INIT_LIST_HEAD(&gameport->node); |
1da177e4 LT |
528 | spin_lock_init(&gameport->timer_lock); |
529 | init_timer(&gameport->poll_timer); | |
530 | gameport->poll_timer.function = gameport_run_poll_handler; | |
531 | gameport->poll_timer.data = (unsigned long)gameport; | |
532 | } | |
533 | ||
534 | /* | |
535 | * Complete gameport port registration. | |
536 | * Driver core will attempt to find appropriate driver for the port. | |
537 | */ | |
538 | static void gameport_add_port(struct gameport *gameport) | |
539 | { | |
73b59a3b RD |
540 | int error; |
541 | ||
1da177e4 LT |
542 | if (gameport->parent) |
543 | gameport->parent->child = gameport; | |
544 | ||
545 | gameport->speed = gameport_measure_speed(gameport); | |
546 | ||
547 | list_add_tail(&gameport->node, &gameport_list); | |
548 | ||
549 | if (gameport->io) | |
550 | printk(KERN_INFO "gameport: %s is %s, io %#x, speed %dkHz\n", | |
551 | gameport->name, gameport->phys, gameport->io, gameport->speed); | |
552 | else | |
553 | printk(KERN_INFO "gameport: %s is %s, speed %dkHz\n", | |
554 | gameport->name, gameport->phys, gameport->speed); | |
555 | ||
73b59a3b RD |
556 | error = device_add(&gameport->dev); |
557 | if (error) | |
558 | printk(KERN_ERR | |
559 | "gameport: device_add() failed for %s (%s), error: %d\n", | |
560 | gameport->phys, gameport->name, error); | |
561 | else | |
562 | gameport->registered = 1; | |
1da177e4 LT |
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); | |
1da177e4 LT |
586 | gameport->registered = 0; |
587 | } | |
588 | ||
73b59a3b RD |
589 | list_del_init(&gameport->node); |
590 | ||
1da177e4 LT |
591 | gameport_remove_pending_events(gameport); |
592 | put_device(&gameport->dev); | |
593 | } | |
594 | ||
595 | /* | |
596 | * Reconnect gameport port and all its children (re-initialize attached devices) | |
597 | */ | |
598 | static void gameport_reconnect_port(struct gameport *gameport) | |
599 | { | |
600 | do { | |
601 | if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) { | |
602 | gameport_disconnect_port(gameport); | |
603 | gameport_find_driver(gameport); | |
604 | /* Ok, old children are now gone, we are done */ | |
605 | break; | |
606 | } | |
607 | gameport = gameport->child; | |
608 | } while (gameport); | |
609 | } | |
610 | ||
611 | /* | |
612 | * gameport_disconnect_port() unbinds a port from its driver. As a side effect | |
613 | * all child ports are unbound and destroyed. | |
614 | */ | |
615 | static void gameport_disconnect_port(struct gameport *gameport) | |
616 | { | |
617 | struct gameport *s, *parent; | |
618 | ||
619 | if (gameport->child) { | |
620 | /* | |
621 | * Children ports should be disconnected and destroyed | |
622 | * first, staring with the leaf one, since we don't want | |
623 | * to do recursion | |
624 | */ | |
625 | for (s = gameport; s->child; s = s->child) | |
626 | /* empty */; | |
627 | ||
628 | do { | |
629 | parent = s->parent; | |
630 | ||
79580057 | 631 | device_release_driver(&s->dev); |
1da177e4 LT |
632 | gameport_destroy_port(s); |
633 | } while ((s = parent) != gameport); | |
634 | } | |
635 | ||
636 | /* | |
637 | * Ok, no children left, now disconnect this port | |
638 | */ | |
79580057 | 639 | device_release_driver(&gameport->dev); |
1da177e4 LT |
640 | } |
641 | ||
1da177e4 LT |
642 | /* |
643 | * Submits register request to kgameportd for subsequent execution. | |
644 | * Note that port registration is always asynchronous. | |
645 | */ | |
646 | void __gameport_register_port(struct gameport *gameport, struct module *owner) | |
647 | { | |
648 | gameport_init_port(gameport); | |
649 | gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT); | |
650 | } | |
651 | ||
652 | /* | |
653 | * Synchronously unregisters gameport port. | |
654 | */ | |
655 | void gameport_unregister_port(struct gameport *gameport) | |
656 | { | |
286295eb | 657 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
658 | gameport_disconnect_port(gameport); |
659 | gameport_destroy_port(gameport); | |
286295eb | 660 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
661 | } |
662 | ||
663 | ||
664 | /* | |
665 | * Gameport driver operations | |
666 | */ | |
667 | ||
668 | static ssize_t gameport_driver_show_description(struct device_driver *drv, char *buf) | |
669 | { | |
670 | struct gameport_driver *driver = to_gameport_driver(drv); | |
671 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
672 | } | |
673 | ||
674 | static struct driver_attribute gameport_driver_attrs[] = { | |
675 | __ATTR(description, S_IRUGO, gameport_driver_show_description, NULL), | |
676 | __ATTR_NULL | |
677 | }; | |
678 | ||
679 | static int gameport_driver_probe(struct device *dev) | |
680 | { | |
681 | struct gameport *gameport = to_gameport_port(dev); | |
682 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
683 | ||
684 | drv->connect(gameport, drv); | |
685 | return gameport->drv ? 0 : -ENODEV; | |
686 | } | |
687 | ||
688 | static int gameport_driver_remove(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->disconnect(gameport); | |
694 | return 0; | |
695 | } | |
696 | ||
73b59a3b RD |
697 | static void gameport_add_driver(struct gameport_driver *drv) |
698 | { | |
699 | int error; | |
700 | ||
701 | error = driver_register(&drv->driver); | |
702 | if (error) | |
703 | printk(KERN_ERR | |
704 | "gameport: driver_register() failed for %s, error: %d\n", | |
705 | drv->driver.name, error); | |
706 | } | |
707 | ||
1da177e4 LT |
708 | void __gameport_register_driver(struct gameport_driver *drv, struct module *owner) |
709 | { | |
710 | drv->driver.bus = &gameport_bus; | |
1da177e4 LT |
711 | gameport_queue_event(drv, owner, GAMEPORT_REGISTER_DRIVER); |
712 | } | |
713 | ||
714 | void gameport_unregister_driver(struct gameport_driver *drv) | |
715 | { | |
716 | struct gameport *gameport; | |
717 | ||
286295eb | 718 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
719 | drv->ignore = 1; /* so gameport_find_driver ignores it */ |
720 | ||
721 | start_over: | |
722 | list_for_each_entry(gameport, &gameport_list, node) { | |
723 | if (gameport->drv == drv) { | |
724 | gameport_disconnect_port(gameport); | |
725 | gameport_find_driver(gameport); | |
726 | /* we could've deleted some ports, restart */ | |
727 | goto start_over; | |
728 | } | |
729 | } | |
730 | ||
731 | driver_unregister(&drv->driver); | |
286295eb | 732 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
733 | } |
734 | ||
735 | static int gameport_bus_match(struct device *dev, struct device_driver *drv) | |
736 | { | |
737 | struct gameport_driver *gameport_drv = to_gameport_driver(drv); | |
738 | ||
739 | return !gameport_drv->ignore; | |
740 | } | |
741 | ||
b187dd7b DT |
742 | static struct bus_type gameport_bus = { |
743 | .name = "gameport", | |
744 | .dev_attrs = gameport_device_attrs, | |
745 | .drv_attrs = gameport_driver_attrs, | |
746 | .match = gameport_bus_match, | |
747 | .probe = gameport_driver_probe, | |
748 | .remove = gameport_driver_remove, | |
749 | }; | |
750 | ||
1da177e4 LT |
751 | static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv) |
752 | { | |
286295eb | 753 | mutex_lock(&gameport->drv_mutex); |
1da177e4 | 754 | gameport->drv = drv; |
286295eb | 755 | mutex_unlock(&gameport->drv_mutex); |
1da177e4 LT |
756 | } |
757 | ||
758 | int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode) | |
759 | { | |
1da177e4 LT |
760 | if (gameport->open) { |
761 | if (gameport->open(gameport, mode)) { | |
762 | return -1; | |
763 | } | |
764 | } else { | |
765 | if (mode != GAMEPORT_MODE_RAW) | |
766 | return -1; | |
767 | } | |
768 | ||
769 | gameport_set_drv(gameport, drv); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | void gameport_close(struct gameport *gameport) | |
774 | { | |
775 | del_timer_sync(&gameport->poll_timer); | |
776 | gameport->poll_handler = NULL; | |
777 | gameport->poll_interval = 0; | |
778 | gameport_set_drv(gameport, NULL); | |
779 | if (gameport->close) | |
780 | gameport->close(gameport); | |
781 | } | |
782 | ||
783 | static int __init gameport_init(void) | |
784 | { | |
73b59a3b | 785 | int error; |
1da177e4 | 786 | |
73b59a3b RD |
787 | error = bus_register(&gameport_bus); |
788 | if (error) { | |
789 | printk(KERN_ERR "gameport: failed to register gameport bus, error: %d\n", error); | |
790 | return error; | |
791 | } | |
792 | ||
793 | gameport_task = kthread_run(gameport_thread, NULL, "kgameportd"); | |
794 | if (IS_ERR(gameport_task)) { | |
795 | bus_unregister(&gameport_bus); | |
796 | error = PTR_ERR(gameport_task); | |
797 | printk(KERN_ERR "gameport: Failed to start kgameportd, error: %d\n", error); | |
798 | return error; | |
799 | } | |
1da177e4 LT |
800 | |
801 | return 0; | |
802 | } | |
803 | ||
804 | static void __exit gameport_exit(void) | |
805 | { | |
806 | bus_unregister(&gameport_bus); | |
3c803e8e | 807 | kthread_stop(gameport_task); |
1da177e4 LT |
808 | } |
809 | ||
51c38f9b | 810 | subsys_initcall(gameport_init); |
1da177e4 | 811 | module_exit(gameport_exit); |