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
pcmcia_get_socket_by_nr(unsigned int nr)232 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
233 {
234 struct pcmcia_socket *s;
235
236 down_read(&pcmcia_socket_list_rwsem);
237 list_for_each_entry(s, &pcmcia_socket_list, socket_list)
238 if (s->sock == nr) {
239 up_read(&pcmcia_socket_list_rwsem);
240 return s;
241 }
242 up_read(&pcmcia_socket_list_rwsem);
243
244 return NULL;
245
246 }
247 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
248
socket_reset(struct pcmcia_socket * skt)249 static int socket_reset(struct pcmcia_socket *skt)
250 {
251 int status, i;
252
253 dev_dbg(&skt->dev, "reset\n");
254
255 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
256 skt->ops->set_socket(skt, &skt->socket);
257 udelay((long)reset_time);
258
259 skt->socket.flags &= ~SS_RESET;
260 skt->ops->set_socket(skt, &skt->socket);
261
262 msleep(unreset_delay * 10);
263 for (i = 0; i < unreset_limit; i++) {
264 skt->ops->get_status(skt, &status);
265
266 if (!(status & SS_DETECT))
267 return -ENODEV;
268
269 if (status & SS_READY)
270 return 0;
271
272 msleep(unreset_check * 10);
273 }
274
275 dev_err(&skt->dev, "time out after reset\n");
276 return -ETIMEDOUT;
277 }
278
279 /*
280 * socket_setup() and socket_shutdown() are called by the main event handler
281 * when card insertion and removal events are received.
282 * socket_setup() turns on socket power and resets the socket, in two stages.
283 * socket_shutdown() unconfigures a socket and turns off socket power.
284 */
socket_shutdown(struct pcmcia_socket * s)285 static void socket_shutdown(struct pcmcia_socket *s)
286 {
287 int status;
288
289 dev_dbg(&s->dev, "shutdown\n");
290
291 if (s->callback)
292 s->callback->remove(s);
293
294 mutex_lock(&s->ops_mutex);
295 s->state &= SOCKET_INUSE | SOCKET_PRESENT;
296 msleep(shutdown_delay * 10);
297 s->state &= SOCKET_INUSE;
298
299 /* Blank out the socket state */
300 s->socket = dead_socket;
301 s->ops->init(s);
302 s->ops->set_socket(s, &s->socket);
303 s->lock_count = 0;
304 kfree(s->fake_cis);
305 s->fake_cis = NULL;
306 s->functions = 0;
307
308 /* From here on we can be sure that only we (that is, the
309 * pccardd thread) accesses this socket, and all (16-bit)
310 * PCMCIA interactions are gone. Therefore, release
311 * ops_mutex so that we don't get a sysfs-related lockdep
312 * warning.
313 */
314 mutex_unlock(&s->ops_mutex);
315
316 #ifdef CONFIG_CARDBUS
317 cb_free(s);
318 #endif
319
320 /* give socket some time to power down */
321 msleep(100);
322
323 s->ops->get_status(s, &status);
324 if (status & SS_POWERON) {
325 dev_err(&s->dev,
326 "*** DANGER *** unable to remove socket power\n");
327 }
328
329 s->state &= ~SOCKET_INUSE;
330 }
331
socket_setup(struct pcmcia_socket * skt,int initial_delay)332 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
333 {
334 int status, i;
335
336 dev_dbg(&skt->dev, "setup\n");
337
338 skt->ops->get_status(skt, &status);
339 if (!(status & SS_DETECT))
340 return -ENODEV;
341
342 msleep(initial_delay * 10);
343
344 for (i = 0; i < 100; i++) {
345 skt->ops->get_status(skt, &status);
346 if (!(status & SS_DETECT))
347 return -ENODEV;
348
349 if (!(status & SS_PENDING))
350 break;
351
352 msleep(100);
353 }
354
355 if (status & SS_PENDING) {
356 dev_err(&skt->dev, "voltage interrogation timed out\n");
357 return -ETIMEDOUT;
358 }
359
360 if (status & SS_CARDBUS) {
361 if (!(skt->features & SS_CAP_CARDBUS)) {
362 dev_err(&skt->dev, "cardbus cards are not supported\n");
363 return -EINVAL;
364 }
365 skt->state |= SOCKET_CARDBUS;
366 } else
367 skt->state &= ~SOCKET_CARDBUS;
368
369 /*
370 * Decode the card voltage requirements, and apply power to the card.
371 */
372 if (status & SS_3VCARD)
373 skt->socket.Vcc = skt->socket.Vpp = 33;
374 else if (!(status & SS_XVCARD))
375 skt->socket.Vcc = skt->socket.Vpp = 50;
376 else {
377 dev_err(&skt->dev, "unsupported voltage key\n");
378 return -EIO;
379 }
380
381 if (skt->power_hook)
382 skt->power_hook(skt, HOOK_POWER_PRE);
383
384 skt->socket.flags = 0;
385 skt->ops->set_socket(skt, &skt->socket);
386
387 /*
388 * Wait "vcc_settle" for the supply to stabilise.
389 */
390 msleep(vcc_settle * 10);
391
392 skt->ops->get_status(skt, &status);
393 if (!(status & SS_POWERON)) {
394 dev_err(&skt->dev, "unable to apply power\n");
395 return -EIO;
396 }
397
398 status = socket_reset(skt);
399
400 if (skt->power_hook)
401 skt->power_hook(skt, HOOK_POWER_POST);
402
403 return status;
404 }
405
406 /*
407 * Handle card insertion. Setup the socket, reset the card,
408 * and then tell the rest of PCMCIA that a card is present.
409 */
socket_insert(struct pcmcia_socket * skt)410 static int socket_insert(struct pcmcia_socket *skt)
411 {
412 int ret;
413
414 dev_dbg(&skt->dev, "insert\n");
415
416 mutex_lock(&skt->ops_mutex);
417 if (skt->state & SOCKET_INUSE) {
418 mutex_unlock(&skt->ops_mutex);
419 return -EINVAL;
420 }
421 skt->state |= SOCKET_INUSE;
422
423 ret = socket_setup(skt, setup_delay);
424 if (ret == 0) {
425 skt->state |= SOCKET_PRESENT;
426
427 dev_notice(&skt->dev, "pccard: %s card inserted into slot %d\n",
428 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
429 skt->sock);
430
431 #ifdef CONFIG_CARDBUS
432 if (skt->state & SOCKET_CARDBUS) {
433 cb_alloc(skt);
434 skt->state |= SOCKET_CARDBUS_CONFIG;
435 }
436 #endif
437 dev_dbg(&skt->dev, "insert done\n");
438 mutex_unlock(&skt->ops_mutex);
439
440 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
441 skt->callback->add(skt);
442 } else {
443 mutex_unlock(&skt->ops_mutex);
444 socket_shutdown(skt);
445 }
446
447 return ret;
448 }
449
socket_suspend(struct pcmcia_socket * skt)450 static int socket_suspend(struct pcmcia_socket *skt)
451 {
452 if ((skt->state & SOCKET_SUSPEND) && !(skt->state & SOCKET_IN_RESUME))
453 return -EBUSY;
454
455 mutex_lock(&skt->ops_mutex);
456 /* store state on first suspend, but not after spurious wakeups */
457 if (!(skt->state & SOCKET_IN_RESUME))
458 skt->suspended_state = skt->state;
459
460 skt->socket = dead_socket;
461 skt->ops->set_socket(skt, &skt->socket);
462 if (skt->ops->suspend)
463 skt->ops->suspend(skt);
464 skt->state |= SOCKET_SUSPEND;
465 skt->state &= ~SOCKET_IN_RESUME;
466 mutex_unlock(&skt->ops_mutex);
467 return 0;
468 }
469
socket_early_resume(struct pcmcia_socket * skt)470 static int socket_early_resume(struct pcmcia_socket *skt)
471 {
472 mutex_lock(&skt->ops_mutex);
473 skt->socket = dead_socket;
474 skt->ops->init(skt);
475 skt->ops->set_socket(skt, &skt->socket);
476 if (skt->state & SOCKET_PRESENT)
477 skt->resume_status = socket_setup(skt, resume_delay);
478 skt->state |= SOCKET_IN_RESUME;
479 mutex_unlock(&skt->ops_mutex);
480 return 0;
481 }
482
socket_late_resume(struct pcmcia_socket * skt)483 static int socket_late_resume(struct pcmcia_socket *skt)
484 {
485 int ret = 0;
486
487 mutex_lock(&skt->ops_mutex);
488 skt->state &= ~(SOCKET_SUSPEND | SOCKET_IN_RESUME);
489 mutex_unlock(&skt->ops_mutex);
490
491 if (!(skt->state & SOCKET_PRESENT)) {
492 ret = socket_insert(skt);
493 if (ret == -ENODEV)
494 ret = 0;
495 return ret;
496 }
497
498 if (skt->resume_status) {
499 socket_shutdown(skt);
500 return 0;
501 }
502
503 if (skt->suspended_state != skt->state) {
504 dev_dbg(&skt->dev,
505 "suspend state 0x%x != resume state 0x%x\n",
506 skt->suspended_state, skt->state);
507
508 socket_shutdown(skt);
509 return socket_insert(skt);
510 }
511
512 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
513 ret = skt->callback->early_resume(skt);
514 return ret;
515 }
516
517 /*
518 * Finalize the resume. In case of a cardbus socket, we have
519 * to rebind the devices as we can't be certain that it has been
520 * replaced, or not.
521 */
socket_complete_resume(struct pcmcia_socket * skt)522 static int socket_complete_resume(struct pcmcia_socket *skt)
523 {
524 int ret = 0;
525 #ifdef CONFIG_CARDBUS
526 if (skt->state & SOCKET_CARDBUS) {
527 /* We can't be sure the CardBus card is the same
528 * as the one previously inserted. Therefore, remove
529 * and re-add... */
530 cb_free(skt);
531 ret = cb_alloc(skt);
532 if (ret)
533 cb_free(skt);
534 }
535 #endif
536 return ret;
537 }
538
539 /*
540 * Resume a socket. If a card is present, verify its CIS against
541 * our cached copy. If they are different, the card has been
542 * replaced, and we need to tell the drivers.
543 */
socket_resume(struct pcmcia_socket * skt)544 static int socket_resume(struct pcmcia_socket *skt)
545 {
546 int err;
547 if (!(skt->state & SOCKET_SUSPEND))
548 return -EBUSY;
549
550 socket_early_resume(skt);
551 err = socket_late_resume(skt);
552 if (!err)
553 err = socket_complete_resume(skt);
554 return err;
555 }
556
socket_remove(struct pcmcia_socket * skt)557 static void socket_remove(struct pcmcia_socket *skt)
558 {
559 dev_notice(&skt->dev, "pccard: card ejected from slot %d\n", skt->sock);
560 socket_shutdown(skt);
561 }
562
563 /*
564 * Process a socket card detect status change.
565 *
566 * If we don't have a card already present, delay the detect event for
567 * about 20ms (to be on the safe side) before reading the socket status.
568 *
569 * Some i82365-based systems send multiple SS_DETECT events during card
570 * insertion, and the "card present" status bit seems to bounce. This
571 * will probably be true with GPIO-based card detection systems after
572 * the product has aged.
573 */
socket_detect_change(struct pcmcia_socket * skt)574 static void socket_detect_change(struct pcmcia_socket *skt)
575 {
576 if (!(skt->state & SOCKET_SUSPEND)) {
577 int status;
578
579 if (!(skt->state & SOCKET_PRESENT))
580 msleep(20);
581
582 skt->ops->get_status(skt, &status);
583 if ((skt->state & SOCKET_PRESENT) &&
584 !(status & SS_DETECT))
585 socket_remove(skt);
586 if (!(skt->state & SOCKET_PRESENT) &&
587 (status & SS_DETECT))
588 socket_insert(skt);
589 }
590 }
591
pccardd(void * __skt)592 static int pccardd(void *__skt)
593 {
594 struct pcmcia_socket *skt = __skt;
595 int ret;
596
597 skt->thread = current;
598 skt->socket = dead_socket;
599 skt->ops->init(skt);
600 skt->ops->set_socket(skt, &skt->socket);
601
602 /* register with the device core */
603 ret = device_register(&skt->dev);
604 if (ret) {
605 dev_warn(&skt->dev, "PCMCIA: unable to register socket\n");
606 skt->thread = NULL;
607 complete(&skt->thread_done);
608 put_device(&skt->dev);
609 return 0;
610 }
611 ret = pccard_sysfs_add_socket(&skt->dev);
612 if (ret)
613 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
614
615 complete(&skt->thread_done);
616
617 /* wait for userspace to catch up */
618 msleep(250);
619
620 set_freezable();
621 for (;;) {
622 unsigned long flags;
623 unsigned int events;
624 unsigned int sysfs_events;
625
626 spin_lock_irqsave(&skt->thread_lock, flags);
627 events = skt->thread_events;
628 skt->thread_events = 0;
629 sysfs_events = skt->sysfs_events;
630 skt->sysfs_events = 0;
631 spin_unlock_irqrestore(&skt->thread_lock, flags);
632
633 mutex_lock(&skt->skt_mutex);
634 if (events & SS_DETECT)
635 socket_detect_change(skt);
636
637 if (sysfs_events) {
638 if (sysfs_events & PCMCIA_UEVENT_EJECT)
639 socket_remove(skt);
640 if (sysfs_events & PCMCIA_UEVENT_INSERT)
641 socket_insert(skt);
642 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
643 !(skt->state & SOCKET_CARDBUS)) {
644 if (skt->callback)
645 ret = skt->callback->suspend(skt);
646 else
647 ret = 0;
648 if (!ret) {
649 socket_suspend(skt);
650 msleep(100);
651 }
652 }
653 if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
654 !(skt->state & SOCKET_CARDBUS)) {
655 ret = socket_resume(skt);
656 if (!ret && skt->callback)
657 skt->callback->resume(skt);
658 }
659 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
660 !(skt->state & SOCKET_CARDBUS)) {
661 if (!ret && skt->callback)
662 skt->callback->requery(skt);
663 }
664 }
665 mutex_unlock(&skt->skt_mutex);
666
667 if (events || sysfs_events)
668 continue;
669
670 set_current_state(TASK_INTERRUPTIBLE);
671 if (kthread_should_stop())
672 break;
673
674 schedule();
675
676 try_to_freeze();
677 }
678 /* make sure we are running before we exit */
679 __set_current_state(TASK_RUNNING);
680
681 /* shut down socket, if a device is still present */
682 if (skt->state & SOCKET_PRESENT) {
683 mutex_lock(&skt->skt_mutex);
684 socket_remove(skt);
685 mutex_unlock(&skt->skt_mutex);
686 }
687
688 /* remove from the device core */
689 pccard_sysfs_remove_socket(&skt->dev);
690 device_unregister(&skt->dev);
691
692 return 0;
693 }
694
695 /*
696 * Yenta (at least) probes interrupts before registering the socket and
697 * starting the handler thread.
698 */
pcmcia_parse_events(struct pcmcia_socket * s,u_int events)699 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
700 {
701 unsigned long flags;
702 dev_dbg(&s->dev, "parse_events: events %08x\n", events);
703 if (s->thread) {
704 spin_lock_irqsave(&s->thread_lock, flags);
705 s->thread_events |= events;
706 spin_unlock_irqrestore(&s->thread_lock, flags);
707
708 wake_up_process(s->thread);
709 }
710 } /* pcmcia_parse_events */
711 EXPORT_SYMBOL(pcmcia_parse_events);
712
713 /**
714 * pcmcia_parse_uevents() - tell pccardd to issue manual commands
715 * @s: the PCMCIA socket we wan't to command
716 * @events: events to pass to pccardd
717 *
718 * userspace-issued insert, eject, suspend and resume commands must be
719 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
720 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
721 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
722 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
723 */
pcmcia_parse_uevents(struct pcmcia_socket * s,u_int events)724 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
725 {
726 unsigned long flags;
727 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
728 if (s->thread) {
729 spin_lock_irqsave(&s->thread_lock, flags);
730 s->sysfs_events |= events;
731 spin_unlock_irqrestore(&s->thread_lock, flags);
732
733 wake_up_process(s->thread);
734 }
735 }
736 EXPORT_SYMBOL(pcmcia_parse_uevents);
737
738
739 /* register pcmcia_callback */
pccard_register_pcmcia(struct pcmcia_socket * s,struct pcmcia_callback * c)740 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
741 {
742 int ret = 0;
743
744 /* s->skt_mutex also protects s->callback */
745 mutex_lock(&s->skt_mutex);
746
747 if (c) {
748 /* registration */
749 if (s->callback) {
750 ret = -EBUSY;
751 goto err;
752 }
753
754 s->callback = c;
755
756 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
757 s->callback->add(s);
758 } else
759 s->callback = NULL;
760 err:
761 mutex_unlock(&s->skt_mutex);
762
763 return ret;
764 }
765 EXPORT_SYMBOL(pccard_register_pcmcia);
766
767
768 /* I'm not sure which "reset" function this is supposed to use,
769 * but for now, it uses the low-level interface's reset, not the
770 * CIS register.
771 */
772
pcmcia_reset_card(struct pcmcia_socket * skt)773 int pcmcia_reset_card(struct pcmcia_socket *skt)
774 {
775 int ret;
776
777 dev_dbg(&skt->dev, "resetting socket\n");
778
779 mutex_lock(&skt->skt_mutex);
780 do {
781 if (!(skt->state & SOCKET_PRESENT)) {
782 dev_dbg(&skt->dev, "can't reset, not present\n");
783 ret = -ENODEV;
784 break;
785 }
786 if (skt->state & SOCKET_SUSPEND) {
787 dev_dbg(&skt->dev, "can't reset, suspended\n");
788 ret = -EBUSY;
789 break;
790 }
791 if (skt->state & SOCKET_CARDBUS) {
792 dev_dbg(&skt->dev, "can't reset, is cardbus\n");
793 ret = -EPERM;
794 break;
795 }
796
797 if (skt->callback)
798 skt->callback->suspend(skt);
799 mutex_lock(&skt->ops_mutex);
800 ret = socket_reset(skt);
801 mutex_unlock(&skt->ops_mutex);
802 if ((ret == 0) && (skt->callback))
803 skt->callback->resume(skt);
804
805 ret = 0;
806 } while (0);
807 mutex_unlock(&skt->skt_mutex);
808
809 return ret;
810 } /* reset_card */
811 EXPORT_SYMBOL(pcmcia_reset_card);
812
813
pcmcia_socket_uevent(const struct device * dev,struct kobj_uevent_env * env)814 static int pcmcia_socket_uevent(const struct device *dev,
815 struct kobj_uevent_env *env)
816 {
817 const struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
818
819 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
820 return -ENOMEM;
821
822 return 0;
823 }
824
825
826 static struct completion pcmcia_unload;
827
pcmcia_release_socket_class(const struct class * data)828 static void pcmcia_release_socket_class(const struct class *data)
829 {
830 complete(&pcmcia_unload);
831 }
832
833
834 #ifdef CONFIG_PM
835
__pcmcia_pm_op(struct device * dev,int (* callback)(struct pcmcia_socket * skt))836 static int __pcmcia_pm_op(struct device *dev,
837 int (*callback) (struct pcmcia_socket *skt))
838 {
839 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
840 int ret;
841
842 mutex_lock(&s->skt_mutex);
843 ret = callback(s);
844 mutex_unlock(&s->skt_mutex);
845
846 return ret;
847 }
848
pcmcia_socket_dev_suspend_noirq(struct device * dev)849 static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
850 {
851 return __pcmcia_pm_op(dev, socket_suspend);
852 }
853
pcmcia_socket_dev_resume_noirq(struct device * dev)854 static int pcmcia_socket_dev_resume_noirq(struct device *dev)
855 {
856 return __pcmcia_pm_op(dev, socket_early_resume);
857 }
858
pcmcia_socket_dev_resume(struct device * dev)859 static int __used pcmcia_socket_dev_resume(struct device *dev)
860 {
861 return __pcmcia_pm_op(dev, socket_late_resume);
862 }
863
pcmcia_socket_dev_complete(struct device * dev)864 static void __used pcmcia_socket_dev_complete(struct device *dev)
865 {
866 WARN(__pcmcia_pm_op(dev, socket_complete_resume),
867 "failed to complete resume");
868 }
869
870 static const struct dev_pm_ops pcmcia_socket_pm_ops = {
871 /* dev_resume may be called with IRQs enabled */
872 SET_SYSTEM_SLEEP_PM_OPS(NULL,
873 pcmcia_socket_dev_resume)
874
875 /* late suspend must be called with IRQs disabled */
876 .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
877 .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
878 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
879
880 /* early resume must be called with IRQs disabled */
881 .resume_noirq = pcmcia_socket_dev_resume_noirq,
882 .thaw_noirq = pcmcia_socket_dev_resume_noirq,
883 .restore_noirq = pcmcia_socket_dev_resume_noirq,
884 .complete = pcmcia_socket_dev_complete,
885 };
886
887 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
888
889 #else /* CONFIG_PM */
890
891 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL
892
893 #endif /* CONFIG_PM */
894
895 struct class pcmcia_socket_class = {
896 .name = "pcmcia_socket",
897 .dev_uevent = pcmcia_socket_uevent,
898 .dev_release = pcmcia_release_socket,
899 .class_release = pcmcia_release_socket_class,
900 .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
901 };
902 EXPORT_SYMBOL(pcmcia_socket_class);
903
904
init_pcmcia_cs(void)905 static int __init init_pcmcia_cs(void)
906 {
907 init_completion(&pcmcia_unload);
908 return class_register(&pcmcia_socket_class);
909 }
910
exit_pcmcia_cs(void)911 static void __exit exit_pcmcia_cs(void)
912 {
913 class_unregister(&pcmcia_socket_class);
914 wait_for_completion(&pcmcia_unload);
915 }
916
917 subsys_initcall(init_pcmcia_cs);
918 module_exit(exit_pcmcia_cs);
919
920