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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Generic gameport layer | |
4 | * | |
5 | * Copyright (c) 1999-2002 Vojtech Pavlik | |
6 | * Copyright (c) 2005 Dmitry Torokhov | |
7 | */ | |
8 | ||
1da177e4 | 9 | |
fc99ec6f DT |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
1da177e4 LT |
12 | #include <linux/stddef.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/gameport.h> | |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/delay.h> | |
c44f2420 | 19 | #include <linux/workqueue.h> |
4e57b681 | 20 | #include <linux/sched.h> /* HZ */ |
286295eb | 21 | #include <linux/mutex.h> |
76460a7b | 22 | #include <linux/timekeeping.h> |
1da177e4 LT |
23 | |
24 | /*#include <asm/io.h>*/ | |
25 | ||
26 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
27 | MODULE_DESCRIPTION("Generic gameport layer"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
76460a7b TI |
30 | static bool use_ktime = true; |
31 | module_param(use_ktime, bool, 0400); | |
32 | MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed"); | |
33 | ||
1da177e4 | 34 | /* |
286295eb | 35 | * gameport_mutex protects entire gameport subsystem and is taken |
1da177e4 LT |
36 | * every time gameport port or driver registrered or unregistered. |
37 | */ | |
286295eb | 38 | static DEFINE_MUTEX(gameport_mutex); |
1da177e4 LT |
39 | |
40 | static LIST_HEAD(gameport_list); | |
41 | ||
29a4a20e | 42 | static struct bus_type gameport_bus; |
1da177e4 LT |
43 | |
44 | static void gameport_add_port(struct gameport *gameport); | |
4ced8e7c | 45 | static void gameport_attach_driver(struct gameport_driver *drv); |
1da177e4 LT |
46 | static void gameport_reconnect_port(struct gameport *gameport); |
47 | static void gameport_disconnect_port(struct gameport *gameport); | |
48 | ||
49 | #if defined(__i386__) | |
50 | ||
334955ef | 51 | #include <linux/i8253.h> |
306e440d | 52 | |
1da177e4 LT |
53 | #define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
54 | #define GET_TIME(x) do { x = get_time_pit(); } while (0) | |
55 | ||
56 | static unsigned int get_time_pit(void) | |
57 | { | |
1da177e4 LT |
58 | unsigned long flags; |
59 | unsigned int count; | |
60 | ||
ced918eb | 61 | raw_spin_lock_irqsave(&i8253_lock, flags); |
1da177e4 LT |
62 | outb_p(0x00, 0x43); |
63 | count = inb_p(0x40); | |
64 | count |= inb_p(0x40) << 8; | |
ced918eb | 65 | raw_spin_unlock_irqrestore(&i8253_lock, flags); |
1da177e4 LT |
66 | |
67 | return count; | |
68 | } | |
69 | ||
70 | #endif | |
71 | ||
72 | ||
73 | ||
74 | /* | |
75 | * gameport_measure_speed() measures the gameport i/o speed. | |
76 | */ | |
77 | ||
78 | static int gameport_measure_speed(struct gameport *gameport) | |
76460a7b TI |
79 | { |
80 | unsigned int i, t, tx; | |
81 | u64 t1, t2, t3; | |
82 | unsigned long flags; | |
83 | ||
84 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
85 | return 0; | |
86 | ||
87 | tx = ~0; | |
88 | ||
89 | for (i = 0; i < 50; i++) { | |
90 | local_irq_save(flags); | |
91 | t1 = ktime_get_ns(); | |
92 | for (t = 0; t < 50; t++) | |
93 | gameport_read(gameport); | |
94 | t2 = ktime_get_ns(); | |
95 | t3 = ktime_get_ns(); | |
96 | local_irq_restore(flags); | |
97 | udelay(i * 10); | |
98 | t = (t2 - t1) - (t3 - t2); | |
99 | if (t < tx) | |
100 | tx = t; | |
101 | } | |
102 | ||
103 | gameport_close(gameport); | |
104 | t = 1000000 * 50; | |
105 | if (tx) | |
106 | t /= tx; | |
107 | return t; | |
108 | } | |
109 | ||
110 | static int old_gameport_measure_speed(struct gameport *gameport) | |
1da177e4 LT |
111 | { |
112 | #if defined(__i386__) | |
113 | ||
114 | unsigned int i, t, t1, t2, t3, tx; | |
115 | unsigned long flags; | |
116 | ||
117 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
118 | return 0; | |
119 | ||
120 | tx = 1 << 30; | |
121 | ||
122 | for(i = 0; i < 50; i++) { | |
123 | local_irq_save(flags); | |
124 | GET_TIME(t1); | |
125 | for (t = 0; t < 50; t++) gameport_read(gameport); | |
126 | GET_TIME(t2); | |
127 | GET_TIME(t3); | |
128 | local_irq_restore(flags); | |
129 | udelay(i * 10); | |
130 | if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; | |
131 | } | |
132 | ||
133 | gameport_close(gameport); | |
134 | return 59659 / (tx < 1 ? 1 : tx); | |
135 | ||
136 | #elif defined (__x86_64__) | |
137 | ||
138 | unsigned int i, t; | |
139 | unsigned long tx, t1, t2, flags; | |
140 | ||
141 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
142 | return 0; | |
143 | ||
144 | tx = 1 << 30; | |
145 | ||
146 | for(i = 0; i < 50; i++) { | |
147 | local_irq_save(flags); | |
4ea1636b | 148 | t1 = rdtsc(); |
1da177e4 | 149 | for (t = 0; t < 50; t++) gameport_read(gameport); |
4ea1636b | 150 | t2 = rdtsc(); |
1da177e4 LT |
151 | local_irq_restore(flags); |
152 | udelay(i * 10); | |
153 | if (t2 - t1 < tx) tx = t2 - t1; | |
154 | } | |
155 | ||
156 | gameport_close(gameport); | |
55ee4ef3 | 157 | return (this_cpu_read(cpu_info.loops_per_jiffy) * |
92cb7612 | 158 | (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx); |
1da177e4 LT |
159 | |
160 | #else | |
161 | ||
162 | unsigned int j, t = 0; | |
163 | ||
164 | if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) | |
165 | return 0; | |
166 | ||
167 | j = jiffies; while (j == jiffies); | |
168 | j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } | |
169 | ||
170 | gameport_close(gameport); | |
171 | return t * HZ / 1000; | |
172 | ||
173 | #endif | |
174 | } | |
175 | ||
176 | void gameport_start_polling(struct gameport *gameport) | |
177 | { | |
178 | spin_lock(&gameport->timer_lock); | |
179 | ||
180 | if (!gameport->poll_cnt++) { | |
181 | BUG_ON(!gameport->poll_handler); | |
182 | BUG_ON(!gameport->poll_interval); | |
183 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
184 | } | |
185 | ||
186 | spin_unlock(&gameport->timer_lock); | |
187 | } | |
3e65067d | 188 | EXPORT_SYMBOL(gameport_start_polling); |
1da177e4 LT |
189 | |
190 | void gameport_stop_polling(struct gameport *gameport) | |
191 | { | |
192 | spin_lock(&gameport->timer_lock); | |
193 | ||
194 | if (!--gameport->poll_cnt) | |
195 | del_timer(&gameport->poll_timer); | |
196 | ||
197 | spin_unlock(&gameport->timer_lock); | |
198 | } | |
3e65067d | 199 | EXPORT_SYMBOL(gameport_stop_polling); |
1da177e4 | 200 | |
e99e88a9 | 201 | static void gameport_run_poll_handler(struct timer_list *t) |
1da177e4 | 202 | { |
e99e88a9 | 203 | struct gameport *gameport = from_timer(gameport, t, poll_timer); |
1da177e4 LT |
204 | |
205 | gameport->poll_handler(gameport); | |
206 | if (gameport->poll_cnt) | |
207 | mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Basic gameport -> driver core mappings | |
212 | */ | |
213 | ||
79580057 | 214 | static int gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv) |
1da177e4 | 215 | { |
23de1510 DT |
216 | int error; |
217 | ||
1da177e4 LT |
218 | gameport->dev.driver = &drv->driver; |
219 | if (drv->connect(gameport, drv)) { | |
220 | gameport->dev.driver = NULL; | |
79580057 | 221 | return -ENODEV; |
1da177e4 | 222 | } |
23de1510 DT |
223 | |
224 | error = device_bind_driver(&gameport->dev); | |
225 | if (error) { | |
fc99ec6f DT |
226 | dev_warn(&gameport->dev, |
227 | "device_bind_driver() failed for %s (%s) and %s, error: %d\n", | |
23de1510 DT |
228 | gameport->phys, gameport->name, |
229 | drv->description, error); | |
230 | drv->disconnect(gameport); | |
231 | gameport->dev.driver = NULL; | |
79580057 | 232 | return error; |
23de1510 DT |
233 | } |
234 | ||
79580057 | 235 | return 0; |
1da177e4 LT |
236 | } |
237 | ||
238 | static void gameport_find_driver(struct gameport *gameport) | |
239 | { | |
73b59a3b RD |
240 | int error; |
241 | ||
73b59a3b RD |
242 | error = device_attach(&gameport->dev); |
243 | if (error < 0) | |
fc99ec6f DT |
244 | dev_warn(&gameport->dev, |
245 | "device_attach() failed for %s (%s), error: %d\n", | |
246 | gameport->phys, gameport->name, error); | |
1da177e4 LT |
247 | } |
248 | ||
249 | ||
250 | /* | |
251 | * Gameport event processing. | |
252 | */ | |
253 | ||
254 | enum gameport_event_type { | |
1da177e4 | 255 | GAMEPORT_REGISTER_PORT, |
6902c0be | 256 | GAMEPORT_ATTACH_DRIVER, |
1da177e4 LT |
257 | }; |
258 | ||
259 | struct gameport_event { | |
260 | enum gameport_event_type type; | |
261 | void *object; | |
262 | struct module *owner; | |
263 | struct list_head node; | |
264 | }; | |
265 | ||
266 | static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */ | |
267 | static LIST_HEAD(gameport_event_list); | |
1da177e4 | 268 | |
c44f2420 | 269 | static struct gameport_event *gameport_get_event(void) |
1da177e4 | 270 | { |
c44f2420 | 271 | struct gameport_event *event = NULL; |
1da177e4 | 272 | unsigned long flags; |
1da177e4 LT |
273 | |
274 | spin_lock_irqsave(&gameport_event_lock, flags); | |
275 | ||
c44f2420 DT |
276 | if (!list_empty(&gameport_event_list)) { |
277 | event = list_first_entry(&gameport_event_list, | |
278 | struct gameport_event, node); | |
279 | list_del_init(&event->node); | |
1da177e4 | 280 | } |
6902c0be | 281 | |
1da177e4 | 282 | spin_unlock_irqrestore(&gameport_event_lock, flags); |
c44f2420 | 283 | return event; |
1da177e4 LT |
284 | } |
285 | ||
286 | static void gameport_free_event(struct gameport_event *event) | |
287 | { | |
288 | module_put(event->owner); | |
289 | kfree(event); | |
290 | } | |
291 | ||
292 | static void gameport_remove_duplicate_events(struct gameport_event *event) | |
293 | { | |
d621af47 | 294 | struct gameport_event *e, *next; |
1da177e4 LT |
295 | unsigned long flags; |
296 | ||
297 | spin_lock_irqsave(&gameport_event_lock, flags); | |
298 | ||
d621af47 | 299 | list_for_each_entry_safe(e, next, &gameport_event_list, node) { |
1da177e4 LT |
300 | if (event->object == e->object) { |
301 | /* | |
302 | * If this event is of different type we should not | |
303 | * look further - we only suppress duplicate events | |
304 | * that were sent back-to-back. | |
305 | */ | |
306 | if (event->type != e->type) | |
307 | break; | |
308 | ||
d621af47 | 309 | list_del_init(&e->node); |
1da177e4 LT |
310 | gameport_free_event(e); |
311 | } | |
312 | } | |
313 | ||
314 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
315 | } | |
316 | ||
1da177e4 | 317 | |
c44f2420 | 318 | static void gameport_handle_events(struct work_struct *work) |
1da177e4 LT |
319 | { |
320 | struct gameport_event *event; | |
1da177e4 | 321 | |
286295eb | 322 | mutex_lock(&gameport_mutex); |
1da177e4 | 323 | |
9e50afd0 DT |
324 | /* |
325 | * Note that we handle only one event here to give swsusp | |
326 | * a chance to freeze kgameportd thread. Gameport events | |
327 | * should be pretty rare so we are not concerned about | |
328 | * taking performance hit. | |
329 | */ | |
330 | if ((event = gameport_get_event())) { | |
1da177e4 LT |
331 | |
332 | switch (event->type) { | |
1da177e4 | 333 | |
fc99ec6f DT |
334 | case GAMEPORT_REGISTER_PORT: |
335 | gameport_add_port(event->object); | |
336 | break; | |
1da177e4 | 337 | |
fc99ec6f DT |
338 | case GAMEPORT_ATTACH_DRIVER: |
339 | gameport_attach_driver(event->object); | |
340 | break; | |
1da177e4 LT |
341 | } |
342 | ||
343 | gameport_remove_duplicate_events(event); | |
344 | gameport_free_event(event); | |
345 | } | |
346 | ||
286295eb | 347 | mutex_unlock(&gameport_mutex); |
1da177e4 LT |
348 | } |
349 | ||
c44f2420 DT |
350 | static DECLARE_WORK(gameport_event_work, gameport_handle_events); |
351 | ||
352 | static int gameport_queue_event(void *object, struct module *owner, | |
353 | enum gameport_event_type event_type) | |
354 | { | |
355 | unsigned long flags; | |
356 | struct gameport_event *event; | |
357 | int retval = 0; | |
358 | ||
359 | spin_lock_irqsave(&gameport_event_lock, flags); | |
360 | ||
361 | /* | |
362 | * Scan event list for the other events for the same gameport port, | |
363 | * starting with the most recent one. If event is the same we | |
364 | * do not need add new one. If event is of different type we | |
365 | * need to add this event and should not look further because | |
366 | * we need to preserve sequence of distinct events. | |
367 | */ | |
368 | list_for_each_entry_reverse(event, &gameport_event_list, node) { | |
369 | if (event->object == object) { | |
370 | if (event->type == event_type) | |
371 | goto out; | |
372 | break; | |
373 | } | |
374 | } | |
375 | ||
376 | event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC); | |
377 | if (!event) { | |
378 | pr_err("Not enough memory to queue event %d\n", event_type); | |
379 | retval = -ENOMEM; | |
380 | goto out; | |
381 | } | |
382 | ||
383 | if (!try_module_get(owner)) { | |
fef5f569 JP |
384 | pr_warn("Can't get module reference, dropping event %d\n", |
385 | event_type); | |
c44f2420 DT |
386 | kfree(event); |
387 | retval = -EINVAL; | |
388 | goto out; | |
389 | } | |
390 | ||
391 | event->type = event_type; | |
392 | event->object = object; | |
393 | event->owner = owner; | |
394 | ||
395 | list_add_tail(&event->node, &gameport_event_list); | |
1d64b655 | 396 | queue_work(system_long_wq, &gameport_event_work); |
c44f2420 DT |
397 | |
398 | out: | |
399 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
400 | return retval; | |
401 | } | |
402 | ||
1da177e4 | 403 | /* |
6902c0be DT |
404 | * Remove all events that have been submitted for a given object, |
405 | * be it a gameport port or a driver. | |
1da177e4 | 406 | */ |
6902c0be | 407 | static void gameport_remove_pending_events(void *object) |
1da177e4 | 408 | { |
d621af47 | 409 | struct gameport_event *event, *next; |
1da177e4 LT |
410 | unsigned long flags; |
411 | ||
412 | spin_lock_irqsave(&gameport_event_lock, flags); | |
413 | ||
d621af47 | 414 | list_for_each_entry_safe(event, next, &gameport_event_list, node) { |
6902c0be | 415 | if (event->object == object) { |
d621af47 | 416 | list_del_init(&event->node); |
1da177e4 LT |
417 | gameport_free_event(event); |
418 | } | |
419 | } | |
420 | ||
421 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
422 | } | |
423 | ||
424 | /* | |
425 | * Destroy child gameport port (if any) that has not been fully registered yet. | |
426 | * | |
427 | * Note that we rely on the fact that port can have only one child and therefore | |
428 | * only one child registration request can be pending. Additionally, children | |
429 | * are registered by driver's connect() handler so there can't be a grandchild | |
430 | * pending registration together with a child. | |
431 | */ | |
432 | static struct gameport *gameport_get_pending_child(struct gameport *parent) | |
433 | { | |
434 | struct gameport_event *event; | |
435 | struct gameport *gameport, *child = NULL; | |
436 | unsigned long flags; | |
437 | ||
438 | spin_lock_irqsave(&gameport_event_lock, flags); | |
439 | ||
440 | list_for_each_entry(event, &gameport_event_list, node) { | |
441 | if (event->type == GAMEPORT_REGISTER_PORT) { | |
442 | gameport = event->object; | |
443 | if (gameport->parent == parent) { | |
444 | child = gameport; | |
445 | break; | |
446 | } | |
447 | } | |
448 | } | |
449 | ||
450 | spin_unlock_irqrestore(&gameport_event_lock, flags); | |
451 | return child; | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* |
455 | * Gameport port operations | |
456 | */ | |
457 | ||
0cba7de7 | 458 | static ssize_t gameport_description_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
459 | { |
460 | struct gameport *gameport = to_gameport_port(dev); | |
fc99ec6f | 461 | |
1da177e4 LT |
462 | return sprintf(buf, "%s\n", gameport->name); |
463 | } | |
0cba7de7 | 464 | static DEVICE_ATTR(description, S_IRUGO, gameport_description_show, NULL); |
1da177e4 | 465 | |
0cba7de7 | 466 | static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
467 | { |
468 | struct gameport *gameport = to_gameport_port(dev); | |
469 | struct device_driver *drv; | |
79580057 | 470 | int error; |
1da177e4 | 471 | |
79580057 DT |
472 | error = mutex_lock_interruptible(&gameport_mutex); |
473 | if (error) | |
474 | return error; | |
1da177e4 | 475 | |
1da177e4 LT |
476 | if (!strncmp(buf, "none", count)) { |
477 | gameport_disconnect_port(gameport); | |
478 | } else if (!strncmp(buf, "reconnect", count)) { | |
479 | gameport_reconnect_port(gameport); | |
480 | } else if (!strncmp(buf, "rescan", count)) { | |
481 | gameport_disconnect_port(gameport); | |
482 | gameport_find_driver(gameport); | |
483 | } else if ((drv = driver_find(buf, &gameport_bus)) != NULL) { | |
484 | gameport_disconnect_port(gameport); | |
79580057 | 485 | error = gameport_bind_driver(gameport, to_gameport_driver(drv)); |
1da177e4 | 486 | } else { |
79580057 | 487 | error = -EINVAL; |
1da177e4 LT |
488 | } |
489 | ||
286295eb | 490 | mutex_unlock(&gameport_mutex); |
1da177e4 | 491 | |
79580057 | 492 | return error ? error : count; |
1da177e4 | 493 | } |
0cba7de7 | 494 | static DEVICE_ATTR_WO(drvctl); |
1da177e4 | 495 | |
0cba7de7 GKH |
496 | static struct attribute *gameport_device_attrs[] = { |
497 | &dev_attr_description.attr, | |
498 | &dev_attr_drvctl.attr, | |
499 | NULL, | |
1da177e4 | 500 | }; |
0cba7de7 | 501 | ATTRIBUTE_GROUPS(gameport_device); |
1da177e4 LT |
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 | } | |
3e65067d | 519 | EXPORT_SYMBOL(gameport_set_phys); |
1da177e4 LT |
520 | |
521 | /* | |
522 | * Prepare gameport port for registration. | |
523 | */ | |
524 | static void gameport_init_port(struct gameport *gameport) | |
525 | { | |
939ffb17 | 526 | static atomic_t gameport_no = ATOMIC_INIT(-1); |
1da177e4 LT |
527 | |
528 | __module_get(THIS_MODULE); | |
529 | ||
286295eb | 530 | mutex_init(&gameport->drv_mutex); |
1da177e4 | 531 | device_initialize(&gameport->dev); |
fc99ec6f | 532 | dev_set_name(&gameport->dev, "gameport%lu", |
939ffb17 | 533 | (unsigned long)atomic_inc_return(&gameport_no)); |
1da177e4 LT |
534 | gameport->dev.bus = &gameport_bus; |
535 | gameport->dev.release = gameport_release_port; | |
536 | if (gameport->parent) | |
537 | gameport->dev.parent = &gameport->parent->dev; | |
538 | ||
73b59a3b | 539 | INIT_LIST_HEAD(&gameport->node); |
1da177e4 | 540 | spin_lock_init(&gameport->timer_lock); |
e99e88a9 | 541 | timer_setup(&gameport->poll_timer, gameport_run_poll_handler, 0); |
1da177e4 LT |
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 | ||
76460a7b TI |
555 | gameport->speed = use_ktime ? |
556 | gameport_measure_speed(gameport) : | |
557 | old_gameport_measure_speed(gameport); | |
1da177e4 LT |
558 | |
559 | list_add_tail(&gameport->node, &gameport_list); | |
560 | ||
561 | if (gameport->io) | |
fc99ec6f DT |
562 | dev_info(&gameport->dev, "%s is %s, io %#x, speed %dkHz\n", |
563 | gameport->name, gameport->phys, gameport->io, gameport->speed); | |
1da177e4 | 564 | else |
fc99ec6f | 565 | dev_info(&gameport->dev, "%s is %s, speed %dkHz\n", |
1da177e4 LT |
566 | gameport->name, gameport->phys, gameport->speed); |
567 | ||
73b59a3b RD |
568 | error = device_add(&gameport->dev); |
569 | if (error) | |
fc99ec6f DT |
570 | dev_err(&gameport->dev, |
571 | "device_add() failed for %s (%s), error: %d\n", | |
73b59a3b | 572 | gameport->phys, gameport->name, error); |
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 | ||
361b7b5b | 594 | if (device_is_registered(&gameport->dev)) |
1da177e4 | 595 | device_del(&gameport->dev); |
1da177e4 | 596 | |
73b59a3b RD |
597 | list_del_init(&gameport->node); |
598 | ||
1da177e4 LT |
599 | gameport_remove_pending_events(gameport); |
600 | put_device(&gameport->dev); | |
601 | } | |
602 | ||
603 | /* | |
604 | * Reconnect gameport port and all its children (re-initialize attached devices) | |
605 | */ | |
606 | static void gameport_reconnect_port(struct gameport *gameport) | |
607 | { | |
608 | do { | |
609 | if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) { | |
610 | gameport_disconnect_port(gameport); | |
611 | gameport_find_driver(gameport); | |
612 | /* Ok, old children are now gone, we are done */ | |
613 | break; | |
614 | } | |
615 | gameport = gameport->child; | |
616 | } while (gameport); | |
617 | } | |
618 | ||
619 | /* | |
620 | * gameport_disconnect_port() unbinds a port from its driver. As a side effect | |
621 | * all child ports are unbound and destroyed. | |
622 | */ | |
623 | static void gameport_disconnect_port(struct gameport *gameport) | |
624 | { | |
625 | struct gameport *s, *parent; | |
626 | ||
627 | if (gameport->child) { | |
628 | /* | |
629 | * Children ports should be disconnected and destroyed | |
630 | * first, staring with the leaf one, since we don't want | |
631 | * to do recursion | |
632 | */ | |
633 | for (s = gameport; s->child; s = s->child) | |
634 | /* empty */; | |
635 | ||
636 | do { | |
637 | parent = s->parent; | |
638 | ||
79580057 | 639 | device_release_driver(&s->dev); |
1da177e4 LT |
640 | gameport_destroy_port(s); |
641 | } while ((s = parent) != gameport); | |
642 | } | |
643 | ||
644 | /* | |
645 | * Ok, no children left, now disconnect this port | |
646 | */ | |
79580057 | 647 | device_release_driver(&gameport->dev); |
1da177e4 LT |
648 | } |
649 | ||
1da177e4 LT |
650 | /* |
651 | * Submits register request to kgameportd for subsequent execution. | |
652 | * Note that port registration is always asynchronous. | |
653 | */ | |
654 | void __gameport_register_port(struct gameport *gameport, struct module *owner) | |
655 | { | |
656 | gameport_init_port(gameport); | |
657 | gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT); | |
658 | } | |
3e65067d | 659 | EXPORT_SYMBOL(__gameport_register_port); |
1da177e4 LT |
660 | |
661 | /* | |
662 | * Synchronously unregisters gameport port. | |
663 | */ | |
664 | void gameport_unregister_port(struct gameport *gameport) | |
665 | { | |
286295eb | 666 | mutex_lock(&gameport_mutex); |
1da177e4 LT |
667 | gameport_disconnect_port(gameport); |
668 | gameport_destroy_port(gameport); | |
286295eb | 669 | mutex_unlock(&gameport_mutex); |
1da177e4 | 670 | } |
3e65067d | 671 | EXPORT_SYMBOL(gameport_unregister_port); |
1da177e4 LT |
672 | |
673 | ||
674 | /* | |
675 | * Gameport driver operations | |
676 | */ | |
677 | ||
5e9e4911 | 678 | static ssize_t description_show(struct device_driver *drv, char *buf) |
1da177e4 LT |
679 | { |
680 | struct gameport_driver *driver = to_gameport_driver(drv); | |
681 | return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); | |
682 | } | |
5e9e4911 | 683 | static DRIVER_ATTR_RO(description); |
1da177e4 | 684 | |
5e9e4911 GKH |
685 | static struct attribute *gameport_driver_attrs[] = { |
686 | &driver_attr_description.attr, | |
687 | NULL | |
1da177e4 | 688 | }; |
5e9e4911 | 689 | ATTRIBUTE_GROUPS(gameport_driver); |
1da177e4 LT |
690 | |
691 | static int gameport_driver_probe(struct device *dev) | |
692 | { | |
693 | struct gameport *gameport = to_gameport_port(dev); | |
694 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
695 | ||
696 | drv->connect(gameport, drv); | |
697 | return gameport->drv ? 0 : -ENODEV; | |
698 | } | |
699 | ||
700 | static int gameport_driver_remove(struct device *dev) | |
701 | { | |
702 | struct gameport *gameport = to_gameport_port(dev); | |
703 | struct gameport_driver *drv = to_gameport_driver(dev->driver); | |
704 | ||
705 | drv->disconnect(gameport); | |
706 | return 0; | |
707 | } | |
708 | ||
4ced8e7c | 709 | static void gameport_attach_driver(struct gameport_driver *drv) |
73b59a3b RD |
710 | { |
711 | int error; | |
712 | ||
4ced8e7c | 713 | error = driver_attach(&drv->driver); |
73b59a3b | 714 | if (error) |
fc99ec6f | 715 | pr_err("driver_attach() failed for %s, error: %d\n", |
73b59a3b RD |
716 | drv->driver.name, error); |
717 | } | |
718 | ||
6902c0be DT |
719 | int __gameport_register_driver(struct gameport_driver *drv, struct module *owner, |
720 | const char *mod_name) | |
1da177e4 | 721 | { |
6902c0be DT |
722 | int error; |
723 | ||
1da177e4 | 724 | drv->driver.bus = &gameport_bus; |
6902c0be DT |
725 | drv->driver.owner = owner; |
726 | drv->driver.mod_name = mod_name; | |
727 | ||
728 | /* | |
729 | * Temporarily disable automatic binding because probing | |
730 | * takes long time and we are better off doing it in kgameportd | |
731 | */ | |
7e044e05 | 732 | drv->ignore = true; |
6902c0be DT |
733 | |
734 | error = driver_register(&drv->driver); | |
735 | if (error) { | |
fc99ec6f | 736 | pr_err("driver_register() failed for %s, error: %d\n", |
6902c0be DT |
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 | */ | |
7e044e05 | 744 | drv->ignore = false; |
6902c0be DT |
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 | 752 | } |
3e65067d | 753 | EXPORT_SYMBOL(__gameport_register_driver); |
1da177e4 LT |
754 | |
755 | void gameport_unregister_driver(struct gameport_driver *drv) | |
756 | { | |
757 | struct gameport *gameport; | |
758 | ||
286295eb | 759 | mutex_lock(&gameport_mutex); |
6902c0be | 760 | |
7e044e05 | 761 | drv->ignore = true; /* so gameport_find_driver ignores it */ |
6902c0be | 762 | gameport_remove_pending_events(drv); |
1da177e4 LT |
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); | |
6902c0be | 775 | |
286295eb | 776 | mutex_unlock(&gameport_mutex); |
1da177e4 | 777 | } |
3e65067d | 778 | EXPORT_SYMBOL(gameport_unregister_driver); |
1da177e4 LT |
779 | |
780 | static int gameport_bus_match(struct device *dev, struct device_driver *drv) | |
781 | { | |
782 | struct gameport_driver *gameport_drv = to_gameport_driver(drv); | |
783 | ||
784 | return !gameport_drv->ignore; | |
785 | } | |
786 | ||
b187dd7b DT |
787 | static struct bus_type gameport_bus = { |
788 | .name = "gameport", | |
0cba7de7 | 789 | .dev_groups = gameport_device_groups, |
5e9e4911 | 790 | .drv_groups = gameport_driver_groups, |
b187dd7b DT |
791 | .match = gameport_bus_match, |
792 | .probe = gameport_driver_probe, | |
793 | .remove = gameport_driver_remove, | |
794 | }; | |
795 | ||
1da177e4 LT |
796 | static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv) |
797 | { | |
286295eb | 798 | mutex_lock(&gameport->drv_mutex); |
1da177e4 | 799 | gameport->drv = drv; |
286295eb | 800 | mutex_unlock(&gameport->drv_mutex); |
1da177e4 LT |
801 | } |
802 | ||
803 | int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode) | |
804 | { | |
1da177e4 LT |
805 | if (gameport->open) { |
806 | if (gameport->open(gameport, mode)) { | |
807 | return -1; | |
808 | } | |
809 | } else { | |
810 | if (mode != GAMEPORT_MODE_RAW) | |
811 | return -1; | |
812 | } | |
813 | ||
814 | gameport_set_drv(gameport, drv); | |
815 | return 0; | |
816 | } | |
3e65067d | 817 | EXPORT_SYMBOL(gameport_open); |
1da177e4 LT |
818 | |
819 | void gameport_close(struct gameport *gameport) | |
820 | { | |
821 | del_timer_sync(&gameport->poll_timer); | |
822 | gameport->poll_handler = NULL; | |
823 | gameport->poll_interval = 0; | |
824 | gameport_set_drv(gameport, NULL); | |
825 | if (gameport->close) | |
826 | gameport->close(gameport); | |
827 | } | |
3e65067d | 828 | EXPORT_SYMBOL(gameport_close); |
1da177e4 LT |
829 | |
830 | static int __init gameport_init(void) | |
831 | { | |
73b59a3b | 832 | int error; |
1da177e4 | 833 | |
73b59a3b RD |
834 | error = bus_register(&gameport_bus); |
835 | if (error) { | |
fc99ec6f | 836 | pr_err("failed to register gameport bus, error: %d\n", error); |
73b59a3b RD |
837 | return error; |
838 | } | |
839 | ||
1da177e4 LT |
840 | |
841 | return 0; | |
842 | } | |
843 | ||
844 | static void __exit gameport_exit(void) | |
845 | { | |
846 | bus_unregister(&gameport_bus); | |
c44f2420 DT |
847 | |
848 | /* | |
849 | * There should not be any outstanding events but work may | |
850 | * still be scheduled so simply cancel it. | |
851 | */ | |
852 | cancel_work_sync(&gameport_event_work); | |
1da177e4 LT |
853 | } |
854 | ||
51c38f9b | 855 | subsys_initcall(gameport_init); |
1da177e4 | 856 | module_exit(gameport_exit); |