]>
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 | ||
fc99ec6f DT |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
1da177e4 LT |
16 | #include <linux/stddef.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/ioport.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/gameport.h> | |
1da177e4 LT |
21 | #include <linux/slab.h> |
22 | #include <linux/delay.h> | |
c44f2420 | 23 | #include <linux/workqueue.h> |
4e57b681 | 24 | #include <linux/sched.h> /* HZ */ |
286295eb | 25 | #include <linux/mutex.h> |
76460a7b | 26 | #include <linux/timekeeping.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 | ||
76460a7b TI |
34 | static bool use_ktime = true; |
35 | module_param(use_ktime, bool, 0400); | |
36 | MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed"); | |
37 | ||
1da177e4 | 38 | /* |
286295eb | 39 | * gameport_mutex protects entire gameport subsystem and is taken |
1da177e4 LT |
40 | * every time gameport port or driver registrered or unregistered. |
41 | */ | |
286295eb | 42 | static DEFINE_MUTEX(gameport_mutex); |
1da177e4 LT |
43 | |
44 | static LIST_HEAD(gameport_list); | |
45 | ||
29a4a20e | 46 | static struct bus_type gameport_bus; |
1da177e4 LT |
47 | |
48 | static void gameport_add_port(struct gameport *gameport); | |
4ced8e7c | 49 | static void gameport_attach_driver(struct gameport_driver *drv); |
1da177e4 LT |
50 | static void gameport_reconnect_port(struct gameport *gameport); |
51 | static void gameport_disconnect_port(struct gameport *gameport); | |
52 | ||
53 | #if defined(__i386__) | |
54 | ||
334955ef | 55 | #include <linux/i8253.h> |
306e440d | 56 | |
1da177e4 LT |
57 | #define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
58 | #define GET_TIME(x) do { x = get_time_pit(); } while (0) | |
59 | ||
60 | static unsigned int get_time_pit(void) | |
61 | { | |
1da177e4 LT |
62 | unsigned long flags; |
63 | unsigned int count; | |
64 | ||
ced918eb | 65 | raw_spin_lock_irqsave(&i8253_lock, flags); |
1da177e4 LT |
66 | outb_p(0x00, 0x43); |
67 | count = inb_p(0x40); | |
68 | count |= inb_p(0x40) << 8; | |
ced918eb | 69 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
1da177e4 LT |
70 | |
71 | return count; | |
72 | } | |
73 | ||
74 | #endif | |
75 | ||
76 | ||
77 | ||
78 | /* | |
79 | * gameport_measure_speed() measures the gameport i/o speed. | |
80 | */ | |
81 | ||
82 | static int gameport_measure_speed(struct gameport *gameport) | |
76460a7b TI |
83 | { |
84 | unsigned int i, t, tx; | |
85 | u64 t1, t2, t3; | |
86 | unsigned long flags; | |
87 | ||
88 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
89 | return 0; | |
90 | ||
91 | tx = ~0; | |
92 | ||
93 | for (i = 0; i < 50; i++) { | |
94 | local_irq_save(flags); | |
95 | t1 = ktime_get_ns(); | |
96 | for (t = 0; t < 50; t++) | |
97 | gameport_read(gameport); | |
98 | t2 = ktime_get_ns(); | |
99 | t3 = ktime_get_ns(); | |
100 | local_irq_restore(flags); | |
101 | udelay(i * 10); | |
102 | t = (t2 - t1) - (t3 - t2); | |
103 | if (t < tx) | |
104 | tx = t; | |
105 | } | |
106 | ||
107 | gameport_close(gameport); | |
108 | t = 1000000 * 50; | |
109 | if (tx) | |
110 | t /= tx; | |
111 | return t; | |
112 | } | |
113 | ||
114 | static int old_gameport_measure_speed(struct gameport *gameport) | |
1da177e4 LT |
115 | { |
116 | #if defined(__i386__) | |
117 | ||
118 | unsigned int i, t, t1, t2, t3, tx; | |
119 | unsigned long 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 | GET_TIME(t1); | |
129 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
130 | GET_TIME(t2); | |
131 | GET_TIME(t3); | |
132 | local_irq_restore(flags); | |
133 | udelay(i * 10); | |
134 | if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; | |
135 | } | |
136 | ||
137 | gameport_close(gameport); | |
138 | return 59659 / (tx < 1 ? 1 : tx); | |
139 | ||
140 | #elif defined (__x86_64__) | |
141 | ||
142 | unsigned int i, t; | |
143 | unsigned long tx, t1, t2, flags; | |
144 | ||
145 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
146 | return 0; | |
147 | ||
148 | tx = 1 << 30; | |
149 | ||
150 | for(i = 0; i < 50; i++) { | |
151 | local_irq_save(flags); | |
732f374b | 152 | t1 = native_read_tsc(); |
1da177e4 | 153 | for (t = 0; t < 50; t++) gameport_read(gameport); |
732f374b | 154 | t2 = native_read_tsc(); |
1da177e4 LT |
155 | local_irq_restore(flags); |
156 | udelay(i * 10); | |
157 | if (t2 - t1 < tx) tx = t2 - t1; | |
158 | } | |
159 | ||
160 | gameport_close(gameport); | |
55ee4ef3 | 161 | return (this_cpu_read(cpu_info.loops_per_jiffy) * |
92cb7612 | 162 | (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx); |
1da177e4 LT |
163 | |
164 | #else | |
165 | ||
166 | unsigned int j, t = 0; | |
167 | ||
168 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
169 | return 0; | |
170 | ||
171 | j = jiffies; while (j == jiffies); | |
172 | j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } | |
173 | ||
174 | gameport_close(gameport); | |
175 | return t * HZ / 1000; | |
176 | ||
177 | #endif | |
178 | } | |
179 | ||
180 | void gameport_start_polling(struct gameport *gameport) | |
181 | { | |
182 | spin_lock(&gameport->timer_lock); | |
183 | ||
184 | if (!gameport->poll_cnt++) { | |
185 | BUG_ON(!gameport->poll_handler); | |
186 | BUG_ON(!gameport->poll_interval); | |
187 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
188 | } | |
189 | ||
190 | spin_unlock(&gameport->timer_lock); | |
191 | } | |
3e65067d | 192 | EXPORT_SYMBOL(gameport_start_polling); |
1da177e4 LT |
193 | |
194 | void gameport_stop_polling(struct gameport *gameport) | |
195 | { | |
196 | spin_lock(&gameport->timer_lock); | |
197 | ||
198 | if (!--gameport->poll_cnt) | |
199 | del_timer(&gameport->poll_timer); | |
200 | ||
201 | spin_unlock(&gameport->timer_lock); | |
202 | } | |
3e65067d | 203 | EXPORT_SYMBOL(gameport_stop_polling); |
1da177e4 LT |
204 | |
205 | static void gameport_run_poll_handler(unsigned long d) | |
206 | { | |
207 | struct gameport *gameport = (struct gameport *)d; | |
208 | ||
209 | gameport->poll_handler(gameport); | |
210 | if (gameport->poll_cnt) | |
211 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
212 | } | |
213 | ||
214 | /* | |
215 | * Basic gameport -> driver core mappings | |
216 | */ | |
217 | ||
79580057 | 218 | static int gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv) |
1da177e4 | 219 | { |
23de1510 DT |
220 | int error; |
221 | ||
1da177e4 LT |
222 | gameport->dev.driver = &drv->driver; |
223 | if (drv->connect(gameport, drv)) { | |
224 | gameport->dev.driver = NULL; | |
79580057 | 225 | return -ENODEV; |
1da177e4 | 226 | } |
23de1510 DT |
227 | |
228 | error = device_bind_driver(&gameport->dev); | |
229 | if (error) { | |
fc99ec6f DT |
230 | dev_warn(&gameport->dev, |
231 | "device_bind_driver() failed for %s (%s) and %s, error: %d\n", | |
23de1510 DT |
232 | gameport->phys, gameport->name, |
233 | drv->description, error); | |
234 | drv->disconnect(gameport); | |
235 | gameport->dev.driver = NULL; | |
79580057 | 236 | return error; |
23de1510 DT |
237 | } |
238 | ||
79580057 | 239 | return 0; |
1da177e4 LT |
240 | } |
241 | ||
242 | static void gameport_find_driver(struct gameport *gameport) | |
243 | { | |
73b59a3b RD |
244 | int error; |
245 | ||
73b59a3b RD |
246 | error = device_attach(&gameport->dev); |
247 | if (error < 0) | |
fc99ec6f DT |
248 | dev_warn(&gameport->dev, |
249 | "device_attach() failed for %s (%s), error: %d\n", | |
250 | gameport->phys, gameport->name, error); | |
1da177e4 LT |
251 | } |
252 | ||
253 | ||
254 | /* | |
255 | * Gameport event processing. | |
256 | */ | |
257 | ||
258 | enum gameport_event_type { | |
1da177e4 | 259 | GAMEPORT_REGISTER_PORT, |
6902c0be | 260 | GAMEPORT_ATTACH_DRIVER, |
1da177e4 LT |
261 | }; |
262 | ||
263 | struct gameport_event { | |
264 | enum gameport_event_type type; | |
265 | void *object; | |
266 | struct module *owner; | |
267 | struct list_head node; | |
268 | }; | |
269 | ||
270 | static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */ | |
271 | static LIST_HEAD(gameport_event_list); | |
1da177e4 | 272 | |
c44f2420 | 273 | static struct gameport_event *gameport_get_event(void) |
1da177e4 | 274 | { |
c44f2420 | 275 | struct gameport_event *event = NULL; |
1da177e4 | 276 | unsigned long flags; |
1da177e4 LT |
277 | |
278 | spin_lock_irqsave(&gameport_event_lock, flags); | |
279 | ||
c44f2420 DT |
280 | if (!list_empty(&gameport_event_list)) { |
281 | event = list_first_entry(&gameport_event_list, | |
282 | struct gameport_event, node); | |
283 | list_del_init(&event->node); | |
1da177e4 | 284 | } |
6902c0be | 285 | |
1da177e4 | 286 | spin_unlock_irqrestore(&gameport_event_lock, flags); |
c44f2420 | 287 | return event; |
1da177e4 LT |
288 | } |
289 | ||
290 | static void gameport_free_event(struct gameport_event *event) | |
291 | { | |
292 | module_put(event->owner); | |
293 | kfree(event); | |
294 | } | |
295 | ||
296 | static void gameport_remove_duplicate_events(struct gameport_event *event) | |
297 | { | |
d621af47 | 298 | struct gameport_event *e, *next; |
1da177e4 LT |
299 | unsigned long flags; |
300 | ||
301 | spin_lock_irqsave(&gameport_event_lock, flags); | |
302 | ||
d621af47 | 303 | list_for_each_entry_safe(e, next, &gameport_event_list, node) { |
1da177e4 LT |
304 | if (event->object == e->object) { |
305 | /* | |
306 | * If this event is of different type we should not | |
307 | * look further - we only suppress duplicate events | |
308 | * that were sent back-to-back. | |
309 | */ | |
310 | if (event->type != e->type) | |
311 | break; | |
312 | ||
d621af47 | 313 | list_del_init(&e->node); |
1da177e4 LT |
314 | gameport_free_event(e); |
315 | } | |
316 | } | |
317 | ||
318 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
319 | } | |
320 | ||
1da177e4 | 321 | |
c44f2420 | 322 | static void gameport_handle_events(struct work_struct *work) |
1da177e4 LT |
323 | { |
324 | struct gameport_event *event; | |
1da177e4 | 325 | |
286295eb | 326 | mutex_lock(&gameport_mutex); |
1da177e4 | 327 | |
9e50afd0 DT |
328 | /* |
329 | * Note that we handle only one event here to give swsusp | |
330 | * a chance to freeze kgameportd thread. Gameport events | |
331 | * should be pretty rare so we are not concerned about | |
332 | * taking performance hit. | |
333 | */ | |
334 | if ((event = gameport_get_event())) { | |
1da177e4 LT |
335 | |
336 | switch (event->type) { | |
1da177e4 | 337 | |
fc99ec6f DT |
338 | case GAMEPORT_REGISTER_PORT: |
339 | gameport_add_port(event->object); | |
340 | break; | |
1da177e4 | 341 | |
fc99ec6f DT |
342 | case GAMEPORT_ATTACH_DRIVER: |
343 | gameport_attach_driver(event->object); | |
344 | break; | |
1da177e4 LT |
345 | } |
346 | ||
347 | gameport_remove_duplicate_events(event); | |
348 | gameport_free_event(event); | |
349 | } | |
350 | ||
286295eb | 351 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
352 | } |
353 | ||
c44f2420 DT |
354 | static DECLARE_WORK(gameport_event_work, gameport_handle_events); |
355 | ||
356 | static int gameport_queue_event(void *object, struct module *owner, | |
357 | enum gameport_event_type event_type) | |
358 | { | |
359 | unsigned long flags; | |
360 | struct gameport_event *event; | |
361 | int retval = 0; | |
362 | ||
363 | spin_lock_irqsave(&gameport_event_lock, flags); | |
364 | ||
365 | /* | |
366 | * Scan event list for the other events for the same gameport port, | |
367 | * starting with the most recent one. If event is the same we | |
368 | * do not need add new one. If event is of different type we | |
369 | * need to add this event and should not look further because | |
370 | * we need to preserve sequence of distinct events. | |
371 | */ | |
372 | list_for_each_entry_reverse(event, &gameport_event_list, node) { | |
373 | if (event->object == object) { | |
374 | if (event->type == event_type) | |
375 | goto out; | |
376 | break; | |
377 | } | |
378 | } | |
379 | ||
380 | event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC); | |
381 | if (!event) { | |
382 | pr_err("Not enough memory to queue event %d\n", event_type); | |
383 | retval = -ENOMEM; | |
384 | goto out; | |
385 | } | |
386 | ||
387 | if (!try_module_get(owner)) { | |
388 | pr_warning("Can't get module reference, dropping event %d\n", | |
389 | event_type); | |
390 | kfree(event); | |
391 | retval = -EINVAL; | |
392 | goto out; | |
393 | } | |
394 | ||
395 | event->type = event_type; | |
396 | event->object = object; | |
397 | event->owner = owner; | |
398 | ||
399 | list_add_tail(&event->node, &gameport_event_list); | |
1d64b655 | 400 | queue_work(system_long_wq, &gameport_event_work); |
c44f2420 DT |
401 | |
402 | out: | |
403 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
404 | return retval; | |
405 | } | |
406 | ||
1da177e4 | 407 | /* |
6902c0be DT |
408 | * Remove all events that have been submitted for a given object, |
409 | * be it a gameport port or a driver. | |
1da177e4 | 410 | */ |
6902c0be | 411 | static void gameport_remove_pending_events(void *object) |
1da177e4 | 412 | { |
d621af47 | 413 | struct gameport_event *event, *next; |
1da177e4 LT |
414 | unsigned long flags; |
415 | ||
416 | spin_lock_irqsave(&gameport_event_lock, flags); | |
417 | ||
d621af47 | 418 | list_for_each_entry_safe(event, next, &gameport_event_list, node) { |
6902c0be | 419 | if (event->object == object) { |
d621af47 | 420 | list_del_init(&event->node); |
1da177e4 LT |
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 | ||
1da177e4 LT |
458 | /* |
459 | * Gameport port operations | |
460 | */ | |
461 | ||
0cba7de7 | 462 | static ssize_t gameport_description_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
463 | { |
464 | struct gameport *gameport = to_gameport_port(dev); | |
fc99ec6f | 465 | |
1da177e4 LT |
466 | return sprintf(buf, "%s\n", gameport->name); |
467 | } | |
0cba7de7 | 468 | static DEVICE_ATTR(description, S_IRUGO, gameport_description_show, NULL); |
1da177e4 | 469 | |
0cba7de7 | 470 | static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
471 | { |
472 | struct gameport *gameport = to_gameport_port(dev); | |
473 | struct device_driver *drv; | |
79580057 | 474 | int error; |
1da177e4 | 475 | |
79580057 DT |
476 | error = mutex_lock_interruptible(&gameport_mutex); |
477 | if (error) | |
478 | return error; | |
1da177e4 | 479 | |
1da177e4 LT |
480 | if (!strncmp(buf, "none", count)) { |
481 | gameport_disconnect_port(gameport); | |
482 | } else if (!strncmp(buf, "reconnect", count)) { | |
483 | gameport_reconnect_port(gameport); | |
484 | } else if (!strncmp(buf, "rescan", count)) { | |
485 | gameport_disconnect_port(gameport); | |
486 | gameport_find_driver(gameport); | |
487 | } else if ((drv = driver_find(buf, &gameport_bus)) != NULL) { | |
488 | gameport_disconnect_port(gameport); | |
79580057 | 489 | error = gameport_bind_driver(gameport, to_gameport_driver(drv)); |
1da177e4 | 490 | } else { |
79580057 | 491 | error = -EINVAL; |
1da177e4 LT |
492 | } |
493 | ||
286295eb | 494 | mutex_unlock(&gameport_mutex); |
1da177e4 | 495 | |
79580057 | 496 | return error ? error : count; |
1da177e4 | 497 | } |
0cba7de7 | 498 | static DEVICE_ATTR_WO(drvctl); |
1da177e4 | 499 | |
0cba7de7 GKH |
500 | static struct attribute *gameport_device_attrs[] = { |
501 | &dev_attr_description.attr, | |
502 | &dev_attr_drvctl.attr, | |
503 | NULL, | |
1da177e4 | 504 | }; |
0cba7de7 | 505 | ATTRIBUTE_GROUPS(gameport_device); |
1da177e4 LT |
506 | |
507 | static void gameport_release_port(struct device *dev) | |
508 | { | |
509 | struct gameport *gameport = to_gameport_port(dev); | |
510 | ||
511 | kfree(gameport); | |
512 | module_put(THIS_MODULE); | |
513 | } | |
514 | ||
515 | void gameport_set_phys(struct gameport *gameport, const char *fmt, ...) | |
516 | { | |
517 | va_list args; | |
518 | ||
519 | va_start(args, fmt); | |
520 | vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args); | |
521 | va_end(args); | |
522 | } | |
3e65067d | 523 | EXPORT_SYMBOL(gameport_set_phys); |
1da177e4 LT |
524 | |
525 | /* | |
526 | * Prepare gameport port for registration. | |
527 | */ | |
528 | static void gameport_init_port(struct gameport *gameport) | |
529 | { | |
939ffb17 | 530 | static atomic_t gameport_no = ATOMIC_INIT(-1); |
1da177e4 LT |
531 | |
532 | __module_get(THIS_MODULE); | |
533 | ||
286295eb | 534 | mutex_init(&gameport->drv_mutex); |
1da177e4 | 535 | device_initialize(&gameport->dev); |
fc99ec6f | 536 | dev_set_name(&gameport->dev, "gameport%lu", |
939ffb17 | 537 | (unsigned long)atomic_inc_return(&gameport_no)); |
1da177e4 LT |
538 | gameport->dev.bus = &gameport_bus; |
539 | gameport->dev.release = gameport_release_port; | |
540 | if (gameport->parent) | |
541 | gameport->dev.parent = &gameport->parent->dev; | |
542 | ||
73b59a3b | 543 | INIT_LIST_HEAD(&gameport->node); |
1da177e4 LT |
544 | spin_lock_init(&gameport->timer_lock); |
545 | init_timer(&gameport->poll_timer); | |
546 | gameport->poll_timer.function = gameport_run_poll_handler; | |
547 | gameport->poll_timer.data = (unsigned long)gameport; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Complete gameport port registration. | |
552 | * Driver core will attempt to find appropriate driver for the port. | |
553 | */ | |
554 | static void gameport_add_port(struct gameport *gameport) | |
555 | { | |
73b59a3b RD |
556 | int error; |
557 | ||
1da177e4 LT |
558 | if (gameport->parent) |
559 | gameport->parent->child = gameport; | |
560 | ||
76460a7b TI |
561 | gameport->speed = use_ktime ? |
562 | gameport_measure_speed(gameport) : | |
563 | old_gameport_measure_speed(gameport); | |
1da177e4 LT |
564 | |
565 | list_add_tail(&gameport->node, &gameport_list); | |
566 | ||
567 | if (gameport->io) | |
fc99ec6f DT |
568 | dev_info(&gameport->dev, "%s is %s, io %#x, speed %dkHz\n", |
569 | gameport->name, gameport->phys, gameport->io, gameport->speed); | |
1da177e4 | 570 | else |
fc99ec6f | 571 | dev_info(&gameport->dev, "%s is %s, speed %dkHz\n", |
1da177e4 LT |
572 | gameport->name, gameport->phys, gameport->speed); |
573 | ||
73b59a3b RD |
574 | error = device_add(&gameport->dev); |
575 | if (error) | |
fc99ec6f DT |
576 | dev_err(&gameport->dev, |
577 | "device_add() failed for %s (%s), error: %d\n", | |
73b59a3b | 578 | gameport->phys, gameport->name, error); |
1da177e4 LT |
579 | } |
580 | ||
581 | /* | |
582 | * gameport_destroy_port() completes deregistration process and removes | |
583 | * port from the system | |
584 | */ | |
585 | static void gameport_destroy_port(struct gameport *gameport) | |
586 | { | |
587 | struct gameport *child; | |
588 | ||
589 | child = gameport_get_pending_child(gameport); | |
590 | if (child) { | |
591 | gameport_remove_pending_events(child); | |
592 | put_device(&child->dev); | |
593 | } | |
594 | ||
595 | if (gameport->parent) { | |
596 | gameport->parent->child = NULL; | |
597 | gameport->parent = NULL; | |
598 | } | |
599 | ||
361b7b5b | 600 | if (device_is_registered(&gameport->dev)) |
1da177e4 | 601 | device_del(&gameport->dev); |
1da177e4 | 602 | |
73b59a3b RD |
603 | list_del_init(&gameport->node); |
604 | ||
1da177e4 LT |
605 | gameport_remove_pending_events(gameport); |
606 | put_device(&gameport->dev); | |
607 | } | |
608 | ||
609 | /* | |
610 | * Reconnect gameport port and all its children (re-initialize attached devices) | |
611 | */ | |
612 | static void gameport_reconnect_port(struct gameport *gameport) | |
613 | { | |
614 | do { | |
615 | if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) { | |
616 | gameport_disconnect_port(gameport); | |
617 | gameport_find_driver(gameport); | |
618 | /* Ok, old children are now gone, we are done */ | |
619 | break; | |
620 | } | |
621 | gameport = gameport->child; | |
622 | } while (gameport); | |
623 | } | |
624 | ||
625 | /* | |
626 | * gameport_disconnect_port() unbinds a port from its driver. As a side effect | |
627 | * all child ports are unbound and destroyed. | |
628 | */ | |
629 | static void gameport_disconnect_port(struct gameport *gameport) | |
630 | { | |
631 | struct gameport *s, *parent; | |
632 | ||
633 | if (gameport->child) { | |
634 | /* | |
635 | * Children ports should be disconnected and destroyed | |
636 | * first, staring with the leaf one, since we don't want | |
637 | * to do recursion | |
638 | */ | |
639 | for (s = gameport; s->child; s = s->child) | |
640 | /* empty */; | |
641 | ||
642 | do { | |
643 | parent = s->parent; | |
644 | ||
79580057 | 645 | device_release_driver(&s->dev); |
1da177e4 LT |
646 | gameport_destroy_port(s); |
647 | } while ((s = parent) != gameport); | |
648 | } | |
649 | ||
650 | /* | |
651 | * Ok, no children left, now disconnect this port | |
652 | */ | |
79580057 | 653 | device_release_driver(&gameport->dev); |
1da177e4 LT |
654 | } |
655 | ||
1da177e4 LT |
656 | /* |
657 | * Submits register request to kgameportd for subsequent execution. | |
658 | * Note that port registration is always asynchronous. | |
659 | */ | |
660 | void __gameport_register_port(struct gameport *gameport, struct module *owner) | |
661 | { | |
662 | gameport_init_port(gameport); | |
663 | gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT); | |
664 | } | |
3e65067d | 665 | EXPORT_SYMBOL(__gameport_register_port); |
1da177e4 LT |
666 | |
667 | /* | |
668 | * Synchronously unregisters gameport port. | |
669 | */ | |
670 | void gameport_unregister_port(struct gameport *gameport) | |
671 | { | |
286295eb | 672 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
673 | gameport_disconnect_port(gameport); |
674 | gameport_destroy_port(gameport); | |
286295eb | 675 | mutex_unlock(&gameport_mutex); |
1da177e4 | 676 | } |
3e65067d | 677 | EXPORT_SYMBOL(gameport_unregister_port); |
1da177e4 LT |
678 | |
679 | ||
680 | /* | |
681 | * Gameport driver operations | |
682 | */ | |
683 | ||
5e9e4911 | 684 | static ssize_t description_show(struct device_driver *drv, char *buf) |
1da177e4 LT |
685 | { |
686 | struct gameport_driver *driver = to_gameport_driver(drv); | |
687 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
688 | } | |
5e9e4911 | 689 | static DRIVER_ATTR_RO(description); |
1da177e4 | 690 | |
5e9e4911 GKH |
691 | static struct attribute *gameport_driver_attrs[] = { |
692 | &driver_attr_description.attr, | |
693 | NULL | |
1da177e4 | 694 | }; |
5e9e4911 | 695 | ATTRIBUTE_GROUPS(gameport_driver); |
1da177e4 LT |
696 | |
697 | static int gameport_driver_probe(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->connect(gameport, drv); | |
703 | return gameport->drv ? 0 : -ENODEV; | |
704 | } | |
705 | ||
706 | static int gameport_driver_remove(struct device *dev) | |
707 | { | |
708 | struct gameport *gameport = to_gameport_port(dev); | |
709 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
710 | ||
711 | drv->disconnect(gameport); | |
712 | return 0; | |
713 | } | |
714 | ||
4ced8e7c | 715 | static void gameport_attach_driver(struct gameport_driver *drv) |
73b59a3b RD |
716 | { |
717 | int error; | |
718 | ||
4ced8e7c | 719 | error = driver_attach(&drv->driver); |
73b59a3b | 720 | if (error) |
fc99ec6f | 721 | pr_err("driver_attach() failed for %s, error: %d\n", |
73b59a3b RD |
722 | drv->driver.name, error); |
723 | } | |
724 | ||
6902c0be DT |
725 | int __gameport_register_driver(struct gameport_driver *drv, struct module *owner, |
726 | const char *mod_name) | |
1da177e4 | 727 | { |
6902c0be DT |
728 | int error; |
729 | ||
1da177e4 | 730 | drv->driver.bus = &gameport_bus; |
6902c0be DT |
731 | drv->driver.owner = owner; |
732 | drv->driver.mod_name = mod_name; | |
733 | ||
734 | /* | |
735 | * Temporarily disable automatic binding because probing | |
736 | * takes long time and we are better off doing it in kgameportd | |
737 | */ | |
7e044e05 | 738 | drv->ignore = true; |
6902c0be DT |
739 | |
740 | error = driver_register(&drv->driver); | |
741 | if (error) { | |
fc99ec6f | 742 | pr_err("driver_register() failed for %s, error: %d\n", |
6902c0be DT |
743 | drv->driver.name, error); |
744 | return error; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Reset ignore flag and let kgameportd bind the driver to free ports | |
749 | */ | |
7e044e05 | 750 | drv->ignore = false; |
6902c0be DT |
751 | error = gameport_queue_event(drv, NULL, GAMEPORT_ATTACH_DRIVER); |
752 | if (error) { | |
753 | driver_unregister(&drv->driver); | |
754 | return error; | |
755 | } | |
756 | ||
757 | return 0; | |
1da177e4 | 758 | } |
3e65067d | 759 | EXPORT_SYMBOL(__gameport_register_driver); |
1da177e4 LT |
760 | |
761 | void gameport_unregister_driver(struct gameport_driver *drv) | |
762 | { | |
763 | struct gameport *gameport; | |
764 | ||
286295eb | 765 | mutex_lock(&gameport_mutex); |
6902c0be | 766 | |
7e044e05 | 767 | drv->ignore = true; /* so gameport_find_driver ignores it */ |
6902c0be | 768 | gameport_remove_pending_events(drv); |
1da177e4 LT |
769 | |
770 | start_over: | |
771 | list_for_each_entry(gameport, &gameport_list, node) { | |
772 | if (gameport->drv == drv) { | |
773 | gameport_disconnect_port(gameport); | |
774 | gameport_find_driver(gameport); | |
775 | /* we could've deleted some ports, restart */ | |
776 | goto start_over; | |
777 | } | |
778 | } | |
779 | ||
780 | driver_unregister(&drv->driver); | |
6902c0be | 781 | |
286295eb | 782 | mutex_unlock(&gameport_mutex); |
1da177e4 | 783 | } |
3e65067d | 784 | EXPORT_SYMBOL(gameport_unregister_driver); |
1da177e4 LT |
785 | |
786 | static int gameport_bus_match(struct device *dev, struct device_driver *drv) | |
787 | { | |
788 | struct gameport_driver *gameport_drv = to_gameport_driver(drv); | |
789 | ||
790 | return !gameport_drv->ignore; | |
791 | } | |
792 | ||
b187dd7b DT |
793 | static struct bus_type gameport_bus = { |
794 | .name = "gameport", | |
0cba7de7 | 795 | .dev_groups = gameport_device_groups, |
5e9e4911 | 796 | .drv_groups = gameport_driver_groups, |
b187dd7b DT |
797 | .match = gameport_bus_match, |
798 | .probe = gameport_driver_probe, | |
799 | .remove = gameport_driver_remove, | |
800 | }; | |
801 | ||
1da177e4 LT |
802 | static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv) |
803 | { | |
286295eb | 804 | mutex_lock(&gameport->drv_mutex); |
1da177e4 | 805 | gameport->drv = drv; |
286295eb | 806 | mutex_unlock(&gameport->drv_mutex); |
1da177e4 LT |
807 | } |
808 | ||
809 | int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode) | |
810 | { | |
1da177e4 LT |
811 | if (gameport->open) { |
812 | if (gameport->open(gameport, mode)) { | |
813 | return -1; | |
814 | } | |
815 | } else { | |
816 | if (mode != GAMEPORT_MODE_RAW) | |
817 | return -1; | |
818 | } | |
819 | ||
820 | gameport_set_drv(gameport, drv); | |
821 | return 0; | |
822 | } | |
3e65067d | 823 | EXPORT_SYMBOL(gameport_open); |
1da177e4 LT |
824 | |
825 | void gameport_close(struct gameport *gameport) | |
826 | { | |
827 | del_timer_sync(&gameport->poll_timer); | |
828 | gameport->poll_handler = NULL; | |
829 | gameport->poll_interval = 0; | |
830 | gameport_set_drv(gameport, NULL); | |
831 | if (gameport->close) | |
832 | gameport->close(gameport); | |
833 | } | |
3e65067d | 834 | EXPORT_SYMBOL(gameport_close); |
1da177e4 LT |
835 | |
836 | static int __init gameport_init(void) | |
837 | { | |
73b59a3b | 838 | int error; |
1da177e4 | 839 | |
73b59a3b RD |
840 | error = bus_register(&gameport_bus); |
841 | if (error) { | |
fc99ec6f | 842 | pr_err("failed to register gameport bus, error: %d\n", error); |
73b59a3b RD |
843 | return error; |
844 | } | |
845 | ||
1da177e4 LT |
846 | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static void __exit gameport_exit(void) | |
851 | { | |
852 | bus_unregister(&gameport_bus); | |
c44f2420 DT |
853 | |
854 | /* | |
855 | * There should not be any outstanding events but work may | |
856 | * still be scheduled so simply cancel it. | |
857 | */ | |
858 | cancel_work_sync(&gameport_event_work); | |
1da177e4 LT |
859 | } |
860 | ||
51c38f9b | 861 | subsys_initcall(gameport_init); |
1da177e4 | 862 | module_exit(gameport_exit); |