1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * cs.c -- Kernel Card Services - core services
4 *
5 * The initial developer of the original code is David A. Hinds
6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
8 *
9 * (C) 1999 David A. Hinds
10 */
11
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/major.h>
18 #include <linux/errno.h>
19 #include <linux/slab.h>
20 #include <linux/mm.h>
21 #include <linux/interrupt.h>
22 #include <linux/timer.h>
23 #include <linux/ioport.h>
24 #include <linux/delay.h>
25 #include <linux/pm.h>
26 #include <linux/device.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <asm/irq.h>
30
31 #include <pcmcia/ss.h>
32 #include <pcmcia/cistpl.h>
33 #include <pcmcia/cisreg.h>
34 #include <pcmcia/ds.h>
35 #include "cs_internal.h"
36
37
38 /* Module parameters */
39
40 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
41 MODULE_DESCRIPTION("Linux Kernel Card Services");
42 MODULE_LICENSE("GPL");
43
44 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
45
46 INT_MODULE_PARM(setup_delay, 10); /* centiseconds */
47 INT_MODULE_PARM(resume_delay, 20); /* centiseconds */
48 INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */
49 INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */
50 INT_MODULE_PARM(reset_time, 10); /* usecs */
51 INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */
52 INT_MODULE_PARM(unreset_check, 10); /* centiseconds */
53 INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */
54
55 /* Access speed for attribute memory windows */
56 INT_MODULE_PARM(cis_speed, 300); /* ns */
57
58
59 socket_state_t dead_socket = {
60 .csc_mask = SS_DETECT,
61 };
62 EXPORT_SYMBOL(dead_socket);
63
64
65 /* List of all sockets, protected by a rwsem */
66 LIST_HEAD(pcmcia_socket_list);
67 EXPORT_SYMBOL(pcmcia_socket_list);
68
69 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
70 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
71
72
pcmcia_get_socket(struct pcmcia_socket * skt)73 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
74 {
75 struct device *dev = get_device(&skt->dev);
76 if (!dev)
77 return NULL;
78 return dev_get_drvdata(dev);
79 }
80 EXPORT_SYMBOL(pcmcia_get_socket);
81
82
pcmcia_put_socket(struct pcmcia_socket * skt)83 void pcmcia_put_socket(struct pcmcia_socket *skt)
84 {
85 put_device(&skt->dev);
86 }
87 EXPORT_SYMBOL(pcmcia_put_socket);
88
89
pcmcia_release_socket(struct device * dev)90 static void pcmcia_release_socket(struct device *dev)
91 {
92 struct pcmcia_socket *socket = dev_get_drvdata(dev);
93
94 complete(&socket->socket_released);
95 }
96
97 static int pccardd(void *__skt);
98
99 /**
100 * pcmcia_register_socket - add a new pcmcia socket device
101 * @socket: the &socket to register
102 */
pcmcia_register_socket(struct pcmcia_socket * socket)103 int pcmcia_register_socket(struct pcmcia_socket *socket)
104 {
105 struct task_struct *tsk;
106 int ret;
107
108 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
109 return -EINVAL;
110
111 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
112
113 /* try to obtain a socket number [yes, it gets ugly if we
114 * register more than 2^sizeof(unsigned int) pcmcia
115 * sockets... but the socket number is deprecated
116 * anyways, so I don't care] */
117 down_write(&pcmcia_socket_list_rwsem);
118 if (list_empty(&pcmcia_socket_list))
119 socket->sock = 0;
120 else {
121 unsigned int found, i = 1;
122 struct pcmcia_socket *tmp;
123 do {
124 found = 1;
125 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
126 if (tmp->sock == i)
127 found = 0;
128 }
129 i++;
130 } while (!found);
131 socket->sock = i - 1;
132 }
133 list_add_tail(&socket->socket_list, &pcmcia_socket_list);
134 up_write(&pcmcia_socket_list_rwsem);
135
136 #ifndef CONFIG_CARDBUS
137 /*
138 * If we do not support Cardbus, ensure that
139 * the Cardbus socket capability is disabled.
140 */
141 socket->features &= ~SS_CAP_CARDBUS;
142 #endif
143
144 /* set proper values in socket->dev */
145 dev_set_drvdata(&socket->dev, socket);
146 socket->dev.class = &pcmcia_socket_class;
147 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
148
149 /* base address = 0, map = 0 */
150 socket->cis_mem.flags = 0;
151 socket->cis_mem.speed = cis_speed;
152
153 INIT_LIST_HEAD(&socket->cis_cache);
154
155 init_completion(&socket->socket_released);
156 init_completion(&socket->thread_done);
157 mutex_init(&socket->skt_mutex);
158 mutex_init(&socket->ops_mutex);
159 spin_lock_init(&socket->thread_lock);
160
161 if (socket->resource_ops->init) {
162 mutex_lock(&socket->ops_mutex);
163 ret = socket->resource_ops->init(socket);
164 mutex_unlock(&socket->ops_mutex);
165 if (ret)
166 goto err;
167 }
168
169 tsk = kthread_run(pccardd, socket, "pccardd");
170 if (IS_ERR(tsk)) {
171 ret = PTR_ERR(tsk);
172 goto err;
173 }
174
175 wait_for_completion(&socket->thread_done);
176 if (!socket->thread) {
177 dev_warn(&socket->dev,
178 "PCMCIA: warning: socket thread did not start\n");
179 return -EIO;
180 }
181
182 pcmcia_parse_events(socket, SS_DETECT);
183
184 /*
185 * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
186 * If it fails, it doesn't matter -- we still have 32-bit CardBus
187 * support to offer, so this is not a failure mode.
188 */
189 request_module_nowait("pcmcia");
190
191 return 0;
192
193 err:
194 down_write(&pcmcia_socket_list_rwsem);
195 list_del(&socket->socket_list);
196 up_write(&pcmcia_socket_list_rwsem);
197 return ret;
198 } /* pcmcia_register_socket */
199 EXPORT_SYMBOL(pcmcia_register_socket);
200
201
202 /**
203 * pcmcia_unregister_socket - remove a pcmcia socket device
204 * @socket: the &socket to unregister
205 */
pcmcia_unregister_socket(struct pcmcia_socket * socket)206 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
207 {
208 if (!socket)
209 return;
210
211 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
212
213 if (socket->thread)
214 kthread_stop(socket->thread);
215
216 /* remove from our own list */
217 down_write(&pcmcia_socket_list_rwsem);
218 list_del(&socket->socket_list);
219 up_write(&pcmcia_socket_list_rwsem);
220
221 /* wait for sysfs to drop all references */
222 if (socket->resource_ops->exit) {
223 mutex_lock(&socket->ops_mutex);
224 socket->resource_ops->exit(socket);
225 mutex_unlock(&socket->ops_mutex);
226 }
227 wait_for_completion(&socket->socket_released);
228 } /* pcmcia_unregister_socket */
229 EXPORT_SYMBOL(pcmcia_unregister_socket);
230
231
socket_reset(struct pcmcia_socket * skt)232 static int socket_reset(struct pcmcia_socket *skt)
233 {
234 int status, i;
235
236 dev_dbg(&skt->dev, "reset\n");
237
238 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
239 skt->ops->set_socket(skt, &skt->socket);
240 udelay((long)reset_time);
241
242 skt->socket.flags &= ~SS_RESET;
243 skt->ops->set_socket(skt, &skt->socket);
244
245 msleep(unreset_delay * 10);
246 for (i = 0; i < unreset_limit; i++) {
247 skt->ops->get_status(skt, &status);
248
249 if (!(status & SS_DETECT))
250 return -ENODEV;
251
252 if (status & SS_READY)
253 return 0;
254
255 msleep(unreset_check * 10);
256 }
257
258 dev_err(&skt->dev, "time out after reset\n");
259 return -ETIMEDOUT;
260 }
261
262 /*
263 * socket_setup() and socket_shutdown() are called by the main event handler
264 * when card insertion and removal events are received.
265 * socket_setup() turns on socket power and resets the socket, in two stages.
266 * socket_shutdown() unconfigures a socket and turns off socket power.
267 */
socket_shutdown(struct pcmcia_socket * s)268 static void socket_shutdown(struct pcmcia_socket *s)
269 {
270 int status;
271
272 dev_dbg(&s->dev, "shutdown\n");
273
274 if (s->callback)
275 s->callback->remove(s);
276
277 mutex_lock(&s->ops_mutex);
278 s->state &= SOCKET_INUSE | SOCKET_PRESENT;
279 msleep(shutdown_delay * 10);
280 s->state &= SOCKET_INUSE;
281
282 /* Blank out the socket state */
283 s->socket = dead_socket;
284 s->ops->init(s);
285 s->ops->set_socket(s, &s->socket);
286 s->lock_count = 0;
287 kfree(s->fake_cis);
288 s->fake_cis = NULL;
289 s->functions = 0;
290
291 /* From here on we can be sure that only we (that is, the
292 * pccardd thread) accesses this socket, and all (16-bit)
293 * PCMCIA interactions are gone. Therefore, release
294 * ops_mutex so that we don't get a sysfs-related lockdep
295 * warning.
296 */
297 mutex_unlock(&s->ops_mutex);
298
299 #ifdef CONFIG_CARDBUS
300 cb_free(s);
301 #endif
302
303 /* give socket some time to power down */
304 msleep(100);
305
306 s->ops->get_status(s, &status);
307 if (status & SS_POWERON) {
308 dev_err(&s->dev,
309 "*** DANGER *** unable to remove socket power\n");
310 }
311
312 s->state &= ~SOCKET_INUSE;
313 }
314
socket_setup(struct pcmcia_socket * skt,int initial_delay)315 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
316 {
317 int status, i;
318
319 dev_dbg(&skt->dev, "setup\n");
320
321 skt->ops->get_status(skt, &status);
322 if (!(status & SS_DETECT))
323 return -ENODEV;
324
325 msleep(initial_delay * 10);
326
327 for (i = 0; i < 100; i++) {
328 skt->ops->get_status(skt, &status);
329 if (!(status & SS_DETECT))
330 return -ENODEV;
331
332 if (!(status & SS_PENDING))
333 break;
334
335 msleep(100);
336 }
337
338 if (status & SS_PENDING) {
339 dev_err(&skt->dev, "voltage interrogation timed out\n");
340 return -ETIMEDOUT;
341 }
342
343 if (status & SS_CARDBUS) {
344 if (!(skt->features & SS_CAP_CARDBUS)) {
345 dev_err(&skt->dev, "cardbus cards are not supported\n");
346 return -EINVAL;
347 }
348 skt->state |= SOCKET_CARDBUS;
349 } else
350 skt->state &= ~SOCKET_CARDBUS;
351
352 /*
353 * Decode the card voltage requirements, and apply power to the card.
354 */
355 if (status & SS_3VCARD)
356 skt->socket.Vcc = skt->socket.Vpp = 33;
357 else if (!(status & SS_XVCARD))
358 skt->socket.Vcc = skt->socket.Vpp = 50;
359 else {
360 dev_err(&skt->dev, "unsupported voltage key\n");
361 return -EIO;
362 }
363
364 if (skt->power_hook)
365 skt->power_hook(skt, HOOK_POWER_PRE);
366
367 skt->socket.flags = 0;
368 skt->ops->set_socket(skt, &skt->socket);
369
370 /*
371 * Wait "vcc_settle" for the supply to stabilise.
372 */
373 msleep(vcc_settle * 10);
374
375 skt->ops->get_status(skt, &status);
376 if (!(status & SS_POWERON)) {
377 dev_err(&skt->dev, "unable to apply power\n");
378 return -EIO;
379 }
380
381 status = socket_reset(skt);
382
383 if (skt->power_hook)
384 skt->power_hook(skt, HOOK_POWER_POST);
385
386 return status;
387 }
388
389 /*
390 * Handle card insertion. Setup the socket, reset the card,
391 * and then tell the rest of PCMCIA that a card is present.
392 */
socket_insert(struct pcmcia_socket * skt)393 static int socket_insert(struct pcmcia_socket *skt)
394 {
395 int ret;
396
397 dev_dbg(&skt->dev, "insert\n");
398
399 mutex_lock(&skt->ops_mutex);
400 if (skt->state & SOCKET_INUSE) {
401 mutex_unlock(&skt->ops_mutex);
402 return -EINVAL;
403 }
404 skt->state |= SOCKET_INUSE;
405
406 ret = socket_setup(skt, setup_delay);
407 if (ret == 0) {
408 skt->state |= SOCKET_PRESENT;
409
410 dev_notice(&skt->dev, "pccard: %s card inserted into slot %d\n",
411 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
412 skt->sock);
413
414 #ifdef CONFIG_CARDBUS
415 if (skt->state & SOCKET_CARDBUS) {
416 cb_alloc(skt);
417 skt->state |= SOCKET_CARDBUS_CONFIG;
418 }
419 #endif
420 dev_dbg(&skt->dev, "insert done\n");
421 mutex_unlock(&skt->ops_mutex);
422
423 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
424 skt->callback->add(skt);
425 } else {
426 mutex_unlock(&skt->ops_mutex);
427 socket_shutdown(skt);
428 }
429
430 return ret;
431 }
432
socket_suspend(struct pcmcia_socket * skt)433 static int socket_suspend(struct pcmcia_socket *skt)
434 {
435 if ((skt->state & SOCKET_SUSPEND) && !(skt->state & SOCKET_IN_RESUME))
436 return -EBUSY;
437
438 mutex_lock(&skt->ops_mutex);
439 /* store state on first suspend, but not after spurious wakeups */
440 if (!(skt->state & SOCKET_IN_RESUME))
441 skt->suspended_state = skt->state;
442
443 skt->socket = dead_socket;
444 skt->ops->set_socket(skt, &skt->socket);
445 if (skt->ops->suspend)
446 skt->ops->suspend(skt);
447 skt->state |= SOCKET_SUSPEND;
448 skt->state &= ~SOCKET_IN_RESUME;
449 mutex_unlock(&skt->ops_mutex);
450 return 0;
451 }
452
socket_early_resume(struct pcmcia_socket * skt)453 static int socket_early_resume(struct pcmcia_socket *skt)
454 {
455 mutex_lock(&skt->ops_mutex);
456 skt->socket = dead_socket;
457 skt->ops->init(skt);
458 skt->ops->set_socket(skt, &skt->socket);
459 if (skt->state & SOCKET_PRESENT)
460 skt->resume_status = socket_setup(skt, resume_delay);
461 skt->state |= SOCKET_IN_RESUME;
462 mutex_unlock(&skt->ops_mutex);
463 return 0;
464 }
465
socket_late_resume(struct pcmcia_socket * skt)466 static int socket_late_resume(struct pcmcia_socket *skt)
467 {
468 int ret = 0;
469
470 mutex_lock(&skt->ops_mutex);
471 skt->state &= ~(SOCKET_SUSPEND | SOCKET_IN_RESUME);
472 mutex_unlock(&skt->ops_mutex);
473
474 if (!(skt->state & SOCKET_PRESENT)) {
475 ret = socket_insert(skt);
476 if (ret == -ENODEV)
477 ret = 0;
478 return ret;
479 }
480
481 if (skt->resume_status) {
482 socket_shutdown(skt);
483 return 0;
484 }
485
486 if (skt->suspended_state != skt->state) {
487 dev_dbg(&skt->dev,
488 "suspend state 0x%x != resume state 0x%x\n",
489 skt->suspended_state, skt->state);
490
491 socket_shutdown(skt);
492 return socket_insert(skt);
493 }
494
495 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
496 ret = skt->callback->early_resume(skt);
497 return ret;
498 }
499
500 /*
501 * Finalize the resume. In case of a cardbus socket, we have
502 * to rebind the devices as we can't be certain that it has been
503 * replaced, or not.
504 */
socket_complete_resume(struct pcmcia_socket * skt)505 static int socket_complete_resume(struct pcmcia_socket *skt)
506 {
507 int ret = 0;
508 #ifdef CONFIG_CARDBUS
509 if (skt->state & SOCKET_CARDBUS) {
510 /* We can't be sure the CardBus card is the same
511 * as the one previously inserted. Therefore, remove
512 * and re-add... */
513 cb_free(skt);
514 ret = cb_alloc(skt);
515 if (ret)
516 cb_free(skt);
517 }
518 #endif
519 return ret;
520 }
521
522 /*
523 * Resume a socket. If a card is present, verify its CIS against
524 * our cached copy. If they are different, the card has been
525 * replaced, and we need to tell the drivers.
526 */
socket_resume(struct pcmcia_socket * skt)527 static int socket_resume(struct pcmcia_socket *skt)
528 {
529 int err;
530 if (!(skt->state & SOCKET_SUSPEND))
531 return -EBUSY;
532
533 socket_early_resume(skt);
534 err = socket_late_resume(skt);
535 if (!err)
536 err = socket_complete_resume(skt);
537 return err;
538 }
539
socket_remove(struct pcmcia_socket * skt)540 static void socket_remove(struct pcmcia_socket *skt)
541 {
542 dev_notice(&skt->dev, "pccard: card ejected from slot %d\n", skt->sock);
543 socket_shutdown(skt);
544 }
545
546 /*
547 * Process a socket card detect status change.
548 *
549 * If we don't have a card already present, delay the detect event for
550 * about 20ms (to be on the safe side) before reading the socket status.
551 *
552 * Some i82365-based systems send multiple SS_DETECT events during card
553 * insertion, and the "card present" status bit seems to bounce. This
554 * will probably be true with GPIO-based card detection systems after
555 * the product has aged.
556 */
socket_detect_change(struct pcmcia_socket * skt)557 static void socket_detect_change(struct pcmcia_socket *skt)
558 {
559 if (!(skt->state & SOCKET_SUSPEND)) {
560 int status;
561
562 if (!(skt->state & SOCKET_PRESENT))
563 msleep(20);
564
565 skt->ops->get_status(skt, &status);
566 if ((skt->state & SOCKET_PRESENT) &&
567 !(status & SS_DETECT))
568 socket_remove(skt);
569 if (!(skt->state & SOCKET_PRESENT) &&
570 (status & SS_DETECT))
571 socket_insert(skt);
572 }
573 }
574
pccardd(void * __skt)575 static int pccardd(void *__skt)
576 {
577 struct pcmcia_socket *skt = __skt;
578 int ret;
579
580 skt->thread = current;
581 skt->socket = dead_socket;
582 skt->ops->init(skt);
583 skt->ops->set_socket(skt, &skt->socket);
584
585 /* register with the device core */
586 ret = device_register(&skt->dev);
587 if (ret) {
588 dev_warn(&skt->dev, "PCMCIA: unable to register socket\n");
589 skt->thread = NULL;
590 complete(&skt->thread_done);
591 put_device(&skt->dev);
592 return 0;
593 }
594 ret = pccard_sysfs_add_socket(&skt->dev);
595 if (ret)
596 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
597
598 complete(&skt->thread_done);
599
600 /* wait for userspace to catch up */
601 msleep(250);
602
603 set_freezable();
604 for (;;) {
605 unsigned long flags;
606 unsigned int events;
607 unsigned int sysfs_events;
608
609 spin_lock_irqsave(&skt->thread_lock, flags);
610 events = skt->thread_events;
611 skt->thread_events = 0;
612 sysfs_events = skt->sysfs_events;
613 skt->sysfs_events = 0;
614 spin_unlock_irqrestore(&skt->thread_lock, flags);
615
616 mutex_lock(&skt->skt_mutex);
617 if (events & SS_DETECT)
618 socket_detect_change(skt);
619
620 if (sysfs_events) {
621 if (sysfs_events & PCMCIA_UEVENT_EJECT)
622 socket_remove(skt);
623 if (sysfs_events & PCMCIA_UEVENT_INSERT)
624 socket_insert(skt);
625 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
626 !(skt->state & SOCKET_CARDBUS)) {
627 if (skt->callback)
628 ret = skt->callback->suspend(skt);
629 else
630 ret = 0;
631 if (!ret) {
632 socket_suspend(skt);
633 msleep(100);
634 }
635 }
636 if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
637 !(skt->state & SOCKET_CARDBUS)) {
638 ret = socket_resume(skt);
639 if (!ret && skt->callback)
640 skt->callback->resume(skt);
641 }
642 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
643 !(skt->state & SOCKET_CARDBUS)) {
644 if (!ret && skt->callback)
645 skt->callback->requery(skt);
646 }
647 }
648 mutex_unlock(&skt->skt_mutex);
649
650 if (events || sysfs_events)
651 continue;
652
653 set_current_state(TASK_INTERRUPTIBLE);
654 if (kthread_should_stop())
655 break;
656
657 schedule();
658
659 try_to_freeze();
660 }
661 /* make sure we are running before we exit */
662 __set_current_state(TASK_RUNNING);
663
664 /* shut down socket, if a device is still present */
665 if (skt->state & SOCKET_PRESENT) {
666 mutex_lock(&skt->skt_mutex);
667 socket_remove(skt);
668 mutex_unlock(&skt->skt_mutex);
669 }
670
671 /* remove from the device core */
672 pccard_sysfs_remove_socket(&skt->dev);
673 device_unregister(&skt->dev);
674
675 return 0;
676 }
677
678 /*
679 * Yenta (at least) probes interrupts before registering the socket and
680 * starting the handler thread.
681 */
pcmcia_parse_events(struct pcmcia_socket * s,u_int events)682 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
683 {
684 unsigned long flags;
685 dev_dbg(&s->dev, "parse_events: events %08x\n", events);
686 if (s->thread) {
687 spin_lock_irqsave(&s->thread_lock, flags);
688 s->thread_events |= events;
689 spin_unlock_irqrestore(&s->thread_lock, flags);
690
691 wake_up_process(s->thread);
692 }
693 } /* pcmcia_parse_events */
694 EXPORT_SYMBOL(pcmcia_parse_events);
695
696 /**
697 * pcmcia_parse_uevents() - tell pccardd to issue manual commands
698 * @s: the PCMCIA socket we wan't to command
699 * @events: events to pass to pccardd
700 *
701 * userspace-issued insert, eject, suspend and resume commands must be
702 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
703 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
704 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
705 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
706 */
pcmcia_parse_uevents(struct pcmcia_socket * s,u_int events)707 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
708 {
709 unsigned long flags;
710 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
711 if (s->thread) {
712 spin_lock_irqsave(&s->thread_lock, flags);
713 s->sysfs_events |= events;
714 spin_unlock_irqrestore(&s->thread_lock, flags);
715
716 wake_up_process(s->thread);
717 }
718 }
719 EXPORT_SYMBOL(pcmcia_parse_uevents);
720
721
722 /* register pcmcia_callback */
pccard_register_pcmcia(struct pcmcia_socket * s,struct pcmcia_callback * c)723 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
724 {
725 int ret = 0;
726
727 /* s->skt_mutex also protects s->callback */
728 mutex_lock(&s->skt_mutex);
729
730 if (c) {
731 /* registration */
732 if (s->callback) {
733 ret = -EBUSY;
734 goto err;
735 }
736
737 s->callback = c;
738
739 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
740 s->callback->add(s);
741 } else
742 s->callback = NULL;
743 err:
744 mutex_unlock(&s->skt_mutex);
745
746 return ret;
747 }
748 EXPORT_SYMBOL(pccard_register_pcmcia);
749
750
751 /* I'm not sure which "reset" function this is supposed to use,
752 * but for now, it uses the low-level interface's reset, not the
753 * CIS register.
754 */
755
pcmcia_reset_card(struct pcmcia_socket * skt)756 int pcmcia_reset_card(struct pcmcia_socket *skt)
757 {
758 int ret;
759
760 dev_dbg(&skt->dev, "resetting socket\n");
761
762 mutex_lock(&skt->skt_mutex);
763 do {
764 if (!(skt->state & SOCKET_PRESENT)) {
765 dev_dbg(&skt->dev, "can't reset, not present\n");
766 ret = -ENODEV;
767 break;
768 }
769 if (skt->state & SOCKET_SUSPEND) {
770 dev_dbg(&skt->dev, "can't reset, suspended\n");
771 ret = -EBUSY;
772 break;
773 }
774 if (skt->state & SOCKET_CARDBUS) {
775 dev_dbg(&skt->dev, "can't reset, is cardbus\n");
776 ret = -EPERM;
777 break;
778 }
779
780 if (skt->callback)
781 skt->callback->suspend(skt);
782 mutex_lock(&skt->ops_mutex);
783 ret = socket_reset(skt);
784 mutex_unlock(&skt->ops_mutex);
785 if ((ret == 0) && (skt->callback))
786 skt->callback->resume(skt);
787
788 ret = 0;
789 } while (0);
790 mutex_unlock(&skt->skt_mutex);
791
792 return ret;
793 } /* reset_card */
794 EXPORT_SYMBOL(pcmcia_reset_card);
795
796
pcmcia_socket_uevent(const struct device * dev,struct kobj_uevent_env * env)797 static int pcmcia_socket_uevent(const struct device *dev,
798 struct kobj_uevent_env *env)
799 {
800 const struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
801
802 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
803 return -ENOMEM;
804
805 return 0;
806 }
807
808
809 static struct completion pcmcia_unload;
810
pcmcia_release_socket_class(const struct class * data)811 static void pcmcia_release_socket_class(const struct class *data)
812 {
813 complete(&pcmcia_unload);
814 }
815
816
817 #ifdef CONFIG_PM
818
__pcmcia_pm_op(struct device * dev,int (* callback)(struct pcmcia_socket * skt))819 static int __pcmcia_pm_op(struct device *dev,
820 int (*callback) (struct pcmcia_socket *skt))
821 {
822 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
823 int ret;
824
825 mutex_lock(&s->skt_mutex);
826 ret = callback(s);
827 mutex_unlock(&s->skt_mutex);
828
829 return ret;
830 }
831
pcmcia_socket_dev_suspend_noirq(struct device * dev)832 static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
833 {
834 return __pcmcia_pm_op(dev, socket_suspend);
835 }
836
pcmcia_socket_dev_resume_noirq(struct device * dev)837 static int pcmcia_socket_dev_resume_noirq(struct device *dev)
838 {
839 return __pcmcia_pm_op(dev, socket_early_resume);
840 }
841
pcmcia_socket_dev_resume(struct device * dev)842 static int __used pcmcia_socket_dev_resume(struct device *dev)
843 {
844 return __pcmcia_pm_op(dev, socket_late_resume);
845 }
846
pcmcia_socket_dev_complete(struct device * dev)847 static void __used pcmcia_socket_dev_complete(struct device *dev)
848 {
849 WARN(__pcmcia_pm_op(dev, socket_complete_resume),
850 "failed to complete resume");
851 }
852
853 static const struct dev_pm_ops pcmcia_socket_pm_ops = {
854 /* dev_resume may be called with IRQs enabled */
855 SET_SYSTEM_SLEEP_PM_OPS(NULL,
856 pcmcia_socket_dev_resume)
857
858 /* late suspend must be called with IRQs disabled */
859 .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
860 .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
861 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
862
863 /* early resume must be called with IRQs disabled */
864 .resume_noirq = pcmcia_socket_dev_resume_noirq,
865 .thaw_noirq = pcmcia_socket_dev_resume_noirq,
866 .restore_noirq = pcmcia_socket_dev_resume_noirq,
867 .complete = pcmcia_socket_dev_complete,
868 };
869
870 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
871
872 #else /* CONFIG_PM */
873
874 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL
875
876 #endif /* CONFIG_PM */
877
878 const struct class pcmcia_socket_class = {
879 .name = "pcmcia_socket",
880 .dev_uevent = pcmcia_socket_uevent,
881 .dev_release = pcmcia_release_socket,
882 .class_release = pcmcia_release_socket_class,
883 .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
884 };
885 EXPORT_SYMBOL(pcmcia_socket_class);
886
887
init_pcmcia_cs(void)888 static int __init init_pcmcia_cs(void)
889 {
890 init_completion(&pcmcia_unload);
891 return class_register(&pcmcia_socket_class);
892 }
893
exit_pcmcia_cs(void)894 static void __exit exit_pcmcia_cs(void)
895 {
896 class_unregister(&pcmcia_socket_class);
897 wait_for_completion(&pcmcia_unload);
898 }
899
900 subsys_initcall(init_pcmcia_cs);
901 module_exit(exit_pcmcia_cs);
902
903