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1/*
2 * cs.c -- Kernel Card Services - core services
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * The initial developer of the original code is David A. Hinds
9 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
10 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
11 *
12 * (C) 1999 David A. Hinds
13 */
14
15#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/init.h>
18#include <linux/kernel.h>
19#include <linux/string.h>
20#include <linux/major.h>
21#include <linux/errno.h>
22#include <linux/slab.h>
23#include <linux/mm.h>
24#include <linux/interrupt.h>
25#include <linux/timer.h>
26#include <linux/ioport.h>
27#include <linux/delay.h>
28#include <linux/pm.h>
29#include <linux/device.h>
30#include <linux/kthread.h>
31#include <linux/freezer.h>
32#include <asm/system.h>
33#include <asm/irq.h>
34
35#include <pcmcia/ss.h>
36#include <pcmcia/cistpl.h>
37#include <pcmcia/cisreg.h>
38#include <pcmcia/ds.h>
39#include "cs_internal.h"
40
41
42/* Module parameters */
43
44MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
45MODULE_DESCRIPTION("Linux Kernel Card Services");
46MODULE_LICENSE("GPL");
47
48#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
49
50INT_MODULE_PARM(setup_delay, 10); /* centiseconds */
51INT_MODULE_PARM(resume_delay, 20); /* centiseconds */
52INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */
53INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */
54INT_MODULE_PARM(reset_time, 10); /* usecs */
55INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */
56INT_MODULE_PARM(unreset_check, 10); /* centiseconds */
57INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */
58
59/* Access speed for attribute memory windows */
60INT_MODULE_PARM(cis_speed, 300); /* ns */
61
62
63socket_state_t dead_socket = {
64 .csc_mask = SS_DETECT,
65};
66EXPORT_SYMBOL(dead_socket);
67
68
69/* List of all sockets, protected by a rwsem */
70LIST_HEAD(pcmcia_socket_list);
71EXPORT_SYMBOL(pcmcia_socket_list);
72
73DECLARE_RWSEM(pcmcia_socket_list_rwsem);
74EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
75
76
77struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
78{
79 struct device *dev = get_device(&skt->dev);
80 if (!dev)
81 return NULL;
82 return dev_get_drvdata(dev);
83}
84EXPORT_SYMBOL(pcmcia_get_socket);
85
86
87void pcmcia_put_socket(struct pcmcia_socket *skt)
88{
89 put_device(&skt->dev);
90}
91EXPORT_SYMBOL(pcmcia_put_socket);
92
93
94static void pcmcia_release_socket(struct device *dev)
95{
96 struct pcmcia_socket *socket = dev_get_drvdata(dev);
97
98 complete(&socket->socket_released);
99}
100
101static int pccardd(void *__skt);
102
103/**
104 * pcmcia_register_socket - add a new pcmcia socket device
105 * @socket: the &socket to register
106 */
107int pcmcia_register_socket(struct pcmcia_socket *socket)
108{
109 struct task_struct *tsk;
110 int ret;
111
112 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
113 return -EINVAL;
114
115 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
116
117 /* try to obtain a socket number [yes, it gets ugly if we
118 * register more than 2^sizeof(unsigned int) pcmcia
119 * sockets... but the socket number is deprecated
120 * anyways, so I don't care] */
121 down_write(&pcmcia_socket_list_rwsem);
122 if (list_empty(&pcmcia_socket_list))
123 socket->sock = 0;
124 else {
125 unsigned int found, i = 1;
126 struct pcmcia_socket *tmp;
127 do {
128 found = 1;
129 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
130 if (tmp->sock == i)
131 found = 0;
132 }
133 i++;
134 } while (!found);
135 socket->sock = i - 1;
136 }
137 list_add_tail(&socket->socket_list, &pcmcia_socket_list);
138 up_write(&pcmcia_socket_list_rwsem);
139
140#ifndef CONFIG_CARDBUS
141 /*
142 * If we do not support Cardbus, ensure that
143 * the Cardbus socket capability is disabled.
144 */
145 socket->features &= ~SS_CAP_CARDBUS;
146#endif
147
148 /* set proper values in socket->dev */
149 dev_set_drvdata(&socket->dev, socket);
150 socket->dev.class = &pcmcia_socket_class;
151 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
152
153 /* base address = 0, map = 0 */
154 socket->cis_mem.flags = 0;
155 socket->cis_mem.speed = cis_speed;
156
157 INIT_LIST_HEAD(&socket->cis_cache);
158
159 init_completion(&socket->socket_released);
160 init_completion(&socket->thread_done);
161 mutex_init(&socket->skt_mutex);
162 mutex_init(&socket->ops_mutex);
163 spin_lock_init(&socket->thread_lock);
164
165 if (socket->resource_ops->init) {
166 mutex_lock(&socket->ops_mutex);
167 ret = socket->resource_ops->init(socket);
168 mutex_unlock(&socket->ops_mutex);
169 if (ret)
170 goto err;
171 }
172
173 tsk = kthread_run(pccardd, socket, "pccardd");
174 if (IS_ERR(tsk)) {
175 ret = PTR_ERR(tsk);
176 goto err;
177 }
178
179 wait_for_completion(&socket->thread_done);
180 if (!socket->thread) {
181 dev_printk(KERN_WARNING, &socket->dev,
182 "PCMCIA: warning: socket thread did not start\n");
183 return -EIO;
184 }
185
186 pcmcia_parse_events(socket, SS_DETECT);
187
188 /*
189 * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
190 * If it fails, it doesn't matter -- we still have 32-bit CardBus
191 * support to offer, so this is not a failure mode.
192 */
193 request_module_nowait("pcmcia");
194
195 return 0;
196
197 err:
198 down_write(&pcmcia_socket_list_rwsem);
199 list_del(&socket->socket_list);
200 up_write(&pcmcia_socket_list_rwsem);
201 return ret;
202} /* pcmcia_register_socket */
203EXPORT_SYMBOL(pcmcia_register_socket);
204
205
206/**
207 * pcmcia_unregister_socket - remove a pcmcia socket device
208 * @socket: the &socket to unregister
209 */
210void pcmcia_unregister_socket(struct pcmcia_socket *socket)
211{
212 if (!socket)
213 return;
214
215 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
216
217 if (socket->thread)
218 kthread_stop(socket->thread);
219
220 /* remove from our own list */
221 down_write(&pcmcia_socket_list_rwsem);
222 list_del(&socket->socket_list);
223 up_write(&pcmcia_socket_list_rwsem);
224
225 /* wait for sysfs to drop all references */
226 if (socket->resource_ops->exit) {
227 mutex_lock(&socket->ops_mutex);
228 socket->resource_ops->exit(socket);
229 mutex_unlock(&socket->ops_mutex);
230 }
231 wait_for_completion(&socket->socket_released);
232} /* pcmcia_unregister_socket */
233EXPORT_SYMBOL(pcmcia_unregister_socket);
234
235
236struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
237{
238 struct pcmcia_socket *s;
239
240 down_read(&pcmcia_socket_list_rwsem);
241 list_for_each_entry(s, &pcmcia_socket_list, socket_list)
242 if (s->sock == nr) {
243 up_read(&pcmcia_socket_list_rwsem);
244 return s;
245 }
246 up_read(&pcmcia_socket_list_rwsem);
247
248 return NULL;
249
250}
251EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
252
253static int socket_reset(struct pcmcia_socket *skt)
254{
255 int status, i;
256
257 dev_dbg(&skt->dev, "reset\n");
258
259 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
260 skt->ops->set_socket(skt, &skt->socket);
261 udelay((long)reset_time);
262
263 skt->socket.flags &= ~SS_RESET;
264 skt->ops->set_socket(skt, &skt->socket);
265
266 msleep(unreset_delay * 10);
267 for (i = 0; i < unreset_limit; i++) {
268 skt->ops->get_status(skt, &status);
269
270 if (!(status & SS_DETECT))
271 return -ENODEV;
272
273 if (status & SS_READY)
274 return 0;
275
276 msleep(unreset_check * 10);
277 }
278
279 dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
280 return -ETIMEDOUT;
281}
282
283/*
284 * socket_setup() and socket_shutdown() are called by the main event handler
285 * when card insertion and removal events are received.
286 * socket_setup() turns on socket power and resets the socket, in two stages.
287 * socket_shutdown() unconfigures a socket and turns off socket power.
288 */
289static void socket_shutdown(struct pcmcia_socket *s)
290{
291 int status;
292
293 dev_dbg(&s->dev, "shutdown\n");
294
295 if (s->callback)
296 s->callback->remove(s);
297
298 mutex_lock(&s->ops_mutex);
299 s->state &= SOCKET_INUSE | SOCKET_PRESENT;
300 msleep(shutdown_delay * 10);
301 s->state &= SOCKET_INUSE;
302
303 /* Blank out the socket state */
304 s->socket = dead_socket;
305 s->ops->init(s);
306 s->ops->set_socket(s, &s->socket);
307 s->lock_count = 0;
308 kfree(s->fake_cis);
309 s->fake_cis = NULL;
310 s->functions = 0;
311
312 /* From here on we can be sure that only we (that is, the
313 * pccardd thread) accesses this socket, and all (16-bit)
314 * PCMCIA interactions are gone. Therefore, release
315 * ops_mutex so that we don't get a sysfs-related lockdep
316 * warning.
317 */
318 mutex_unlock(&s->ops_mutex);
319
320#ifdef CONFIG_CARDBUS
321 cb_free(s);
322#endif
323
324 /* give socket some time to power down */
325 msleep(100);
326
327 s->ops->get_status(s, &status);
328 if (status & SS_POWERON) {
329 dev_printk(KERN_ERR, &s->dev,
330 "*** DANGER *** unable to remove socket power\n");
331 }
332
333 s->state &= ~SOCKET_INUSE;
334}
335
336static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
337{
338 int status, i;
339
340 dev_dbg(&skt->dev, "setup\n");
341
342 skt->ops->get_status(skt, &status);
343 if (!(status & SS_DETECT))
344 return -ENODEV;
345
346 msleep(initial_delay * 10);
347
348 for (i = 0; i < 100; i++) {
349 skt->ops->get_status(skt, &status);
350 if (!(status & SS_DETECT))
351 return -ENODEV;
352
353 if (!(status & SS_PENDING))
354 break;
355
356 msleep(100);
357 }
358
359 if (status & SS_PENDING) {
360 dev_printk(KERN_ERR, &skt->dev,
361 "voltage interrogation timed out.\n");
362 return -ETIMEDOUT;
363 }
364
365 if (status & SS_CARDBUS) {
366 if (!(skt->features & SS_CAP_CARDBUS)) {
367 dev_printk(KERN_ERR, &skt->dev,
368 "cardbus cards are not supported.\n");
369 return -EINVAL;
370 }
371 skt->state |= SOCKET_CARDBUS;
372 } else
373 skt->state &= ~SOCKET_CARDBUS;
374
375 /*
376 * Decode the card voltage requirements, and apply power to the card.
377 */
378 if (status & SS_3VCARD)
379 skt->socket.Vcc = skt->socket.Vpp = 33;
380 else if (!(status & SS_XVCARD))
381 skt->socket.Vcc = skt->socket.Vpp = 50;
382 else {
383 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
384 return -EIO;
385 }
386
387 if (skt->power_hook)
388 skt->power_hook(skt, HOOK_POWER_PRE);
389
390 skt->socket.flags = 0;
391 skt->ops->set_socket(skt, &skt->socket);
392
393 /*
394 * Wait "vcc_settle" for the supply to stabilise.
395 */
396 msleep(vcc_settle * 10);
397
398 skt->ops->get_status(skt, &status);
399 if (!(status & SS_POWERON)) {
400 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
401 return -EIO;
402 }
403
404 status = socket_reset(skt);
405
406 if (skt->power_hook)
407 skt->power_hook(skt, HOOK_POWER_POST);
408
409 return status;
410}
411
412/*
413 * Handle card insertion. Setup the socket, reset the card,
414 * and then tell the rest of PCMCIA that a card is present.
415 */
416static int socket_insert(struct pcmcia_socket *skt)
417{
418 int ret;
419
420 dev_dbg(&skt->dev, "insert\n");
421
422 mutex_lock(&skt->ops_mutex);
423 if (skt->state & SOCKET_INUSE) {
424 mutex_unlock(&skt->ops_mutex);
425 return -EINVAL;
426 }
427 skt->state |= SOCKET_INUSE;
428
429 ret = socket_setup(skt, setup_delay);
430 if (ret == 0) {
431 skt->state |= SOCKET_PRESENT;
432
433 dev_printk(KERN_NOTICE, &skt->dev,
434 "pccard: %s card inserted into slot %d\n",
435 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
436 skt->sock);
437
438#ifdef CONFIG_CARDBUS
439 if (skt->state & SOCKET_CARDBUS) {
440 cb_alloc(skt);
441 skt->state |= SOCKET_CARDBUS_CONFIG;
442 }
443#endif
444 dev_dbg(&skt->dev, "insert done\n");
445 mutex_unlock(&skt->ops_mutex);
446
447 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
448 skt->callback->add(skt);
449 } else {
450 mutex_unlock(&skt->ops_mutex);
451 socket_shutdown(skt);
452 }
453
454 return ret;
455}
456
457static int socket_suspend(struct pcmcia_socket *skt)
458{
459 if (skt->state & SOCKET_SUSPEND)
460 return -EBUSY;
461
462 mutex_lock(&skt->ops_mutex);
463 skt->suspended_state = skt->state;
464
465 skt->socket = dead_socket;
466 skt->ops->set_socket(skt, &skt->socket);
467 if (skt->ops->suspend)
468 skt->ops->suspend(skt);
469 skt->state |= SOCKET_SUSPEND;
470 mutex_unlock(&skt->ops_mutex);
471 return 0;
472}
473
474static int socket_early_resume(struct pcmcia_socket *skt)
475{
476 mutex_lock(&skt->ops_mutex);
477 skt->socket = dead_socket;
478 skt->ops->init(skt);
479 skt->ops->set_socket(skt, &skt->socket);
480 if (skt->state & SOCKET_PRESENT)
481 skt->resume_status = socket_setup(skt, resume_delay);
482 mutex_unlock(&skt->ops_mutex);
483 return 0;
484}
485
486static int socket_late_resume(struct pcmcia_socket *skt)
487{
488 int ret;
489
490 mutex_lock(&skt->ops_mutex);
491 skt->state &= ~SOCKET_SUSPEND;
492 mutex_unlock(&skt->ops_mutex);
493
494 if (!(skt->state & SOCKET_PRESENT)) {
495 ret = socket_insert(skt);
496 if (ret == -ENODEV)
497 ret = 0;
498 return ret;
499 }
500
501 if (skt->resume_status) {
502 socket_shutdown(skt);
503 return 0;
504 }
505
506 if (skt->suspended_state != skt->state) {
507 dev_dbg(&skt->dev,
508 "suspend state 0x%x != resume state 0x%x\n",
509 skt->suspended_state, skt->state);
510
511 socket_shutdown(skt);
512 return socket_insert(skt);
513 }
514
515#ifdef CONFIG_CARDBUS
516 if (skt->state & SOCKET_CARDBUS) {
517 /* We can't be sure the CardBus card is the same
518 * as the one previously inserted. Therefore, remove
519 * and re-add... */
520 cb_free(skt);
521 cb_alloc(skt);
522 return 0;
523 }
524#endif
525 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
526 skt->callback->early_resume(skt);
527 return 0;
528}
529
530/*
531 * Resume a socket. If a card is present, verify its CIS against
532 * our cached copy. If they are different, the card has been
533 * replaced, and we need to tell the drivers.
534 */
535static int socket_resume(struct pcmcia_socket *skt)
536{
537 if (!(skt->state & SOCKET_SUSPEND))
538 return -EBUSY;
539
540 socket_early_resume(skt);
541 return socket_late_resume(skt);
542}
543
544static void socket_remove(struct pcmcia_socket *skt)
545{
546 dev_printk(KERN_NOTICE, &skt->dev,
547 "pccard: card ejected from slot %d\n", skt->sock);
548 socket_shutdown(skt);
549}
550
551/*
552 * Process a socket card detect status change.
553 *
554 * If we don't have a card already present, delay the detect event for
555 * about 20ms (to be on the safe side) before reading the socket status.
556 *
557 * Some i82365-based systems send multiple SS_DETECT events during card
558 * insertion, and the "card present" status bit seems to bounce. This
559 * will probably be true with GPIO-based card detection systems after
560 * the product has aged.
561 */
562static void socket_detect_change(struct pcmcia_socket *skt)
563{
564 if (!(skt->state & SOCKET_SUSPEND)) {
565 int status;
566
567 if (!(skt->state & SOCKET_PRESENT))
568 msleep(20);
569
570 skt->ops->get_status(skt, &status);
571 if ((skt->state & SOCKET_PRESENT) &&
572 !(status & SS_DETECT))
573 socket_remove(skt);
574 if (!(skt->state & SOCKET_PRESENT) &&
575 (status & SS_DETECT))
576 socket_insert(skt);
577 }
578}
579
580static int pccardd(void *__skt)
581{
582 struct pcmcia_socket *skt = __skt;
583 int ret;
584
585 skt->thread = current;
586 skt->socket = dead_socket;
587 skt->ops->init(skt);
588 skt->ops->set_socket(skt, &skt->socket);
589
590 /* register with the device core */
591 ret = device_register(&skt->dev);
592 if (ret) {
593 dev_printk(KERN_WARNING, &skt->dev,
594 "PCMCIA: unable to register socket\n");
595 skt->thread = NULL;
596 complete(&skt->thread_done);
597 return 0;
598 }
599 ret = pccard_sysfs_add_socket(&skt->dev);
600 if (ret)
601 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
602
603 complete(&skt->thread_done);
604
605 /* wait for userspace to catch up */
606 msleep(250);
607
608 set_freezable();
609 for (;;) {
610 unsigned long flags;
611 unsigned int events;
612 unsigned int sysfs_events;
613
614 set_current_state(TASK_INTERRUPTIBLE);
615
616 spin_lock_irqsave(&skt->thread_lock, flags);
617 events = skt->thread_events;
618 skt->thread_events = 0;
619 sysfs_events = skt->sysfs_events;
620 skt->sysfs_events = 0;
621 spin_unlock_irqrestore(&skt->thread_lock, flags);
622
623 mutex_lock(&skt->skt_mutex);
624 if (events & SS_DETECT)
625 socket_detect_change(skt);
626
627 if (sysfs_events) {
628 if (sysfs_events & PCMCIA_UEVENT_EJECT)
629 socket_remove(skt);
630 if (sysfs_events & PCMCIA_UEVENT_INSERT)
631 socket_insert(skt);
632 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
633 !(skt->state & SOCKET_CARDBUS)) {
634 if (skt->callback)
635 ret = skt->callback->suspend(skt);
636 else
637 ret = 0;
638 if (!ret) {
639 socket_suspend(skt);
640 msleep(100);
641 }
642 }
643 if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
644 !(skt->state & SOCKET_CARDBUS)) {
645 ret = socket_resume(skt);
646 if (!ret && skt->callback)
647 skt->callback->resume(skt);
648 }
649 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
650 !(skt->state & SOCKET_CARDBUS)) {
651 if (!ret && skt->callback)
652 skt->callback->requery(skt);
653 }
654 }
655 mutex_unlock(&skt->skt_mutex);
656
657 if (events || sysfs_events)
658 continue;
659
660 if (kthread_should_stop())
661 break;
662
663 schedule();
664 try_to_freeze();
665 }
666 /* make sure we are running before we exit */
667 set_current_state(TASK_RUNNING);
668
669 /* shut down socket, if a device is still present */
670 if (skt->state & SOCKET_PRESENT) {
671 mutex_lock(&skt->skt_mutex);
672 socket_remove(skt);
673 mutex_unlock(&skt->skt_mutex);
674 }
675
676 /* remove from the device core */
677 pccard_sysfs_remove_socket(&skt->dev);
678 device_unregister(&skt->dev);
679
680 return 0;
681}
682
683/*
684 * Yenta (at least) probes interrupts before registering the socket and
685 * starting the handler thread.
686 */
687void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
688{
689 unsigned long flags;
690 dev_dbg(&s->dev, "parse_events: events %08x\n", events);
691 if (s->thread) {
692 spin_lock_irqsave(&s->thread_lock, flags);
693 s->thread_events |= events;
694 spin_unlock_irqrestore(&s->thread_lock, flags);
695
696 wake_up_process(s->thread);
697 }
698} /* pcmcia_parse_events */
699EXPORT_SYMBOL(pcmcia_parse_events);
700
701/**
702 * pcmcia_parse_uevents() - tell pccardd to issue manual commands
703 * @s: the PCMCIA socket we wan't to command
704 * @events: events to pass to pccardd
705 *
706 * userspace-issued insert, eject, suspend and resume commands must be
707 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
708 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
709 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
710 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
711 */
712void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
713{
714 unsigned long flags;
715 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
716 if (s->thread) {
717 spin_lock_irqsave(&s->thread_lock, flags);
718 s->sysfs_events |= events;
719 spin_unlock_irqrestore(&s->thread_lock, flags);
720
721 wake_up_process(s->thread);
722 }
723}
724EXPORT_SYMBOL(pcmcia_parse_uevents);
725
726
727/* register pcmcia_callback */
728int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
729{
730 int ret = 0;
731
732 /* s->skt_mutex also protects s->callback */
733 mutex_lock(&s->skt_mutex);
734
735 if (c) {
736 /* registration */
737 if (s->callback) {
738 ret = -EBUSY;
739 goto err;
740 }
741
742 s->callback = c;
743
744 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
745 s->callback->add(s);
746 } else
747 s->callback = NULL;
748 err:
749 mutex_unlock(&s->skt_mutex);
750
751 return ret;
752}
753EXPORT_SYMBOL(pccard_register_pcmcia);
754
755
756/* I'm not sure which "reset" function this is supposed to use,
757 * but for now, it uses the low-level interface's reset, not the
758 * CIS register.
759 */
760
761int pcmcia_reset_card(struct pcmcia_socket *skt)
762{
763 int ret;
764
765 dev_dbg(&skt->dev, "resetting socket\n");
766
767 mutex_lock(&skt->skt_mutex);
768 do {
769 if (!(skt->state & SOCKET_PRESENT)) {
770 dev_dbg(&skt->dev, "can't reset, not present\n");
771 ret = -ENODEV;
772 break;
773 }
774 if (skt->state & SOCKET_SUSPEND) {
775 dev_dbg(&skt->dev, "can't reset, suspended\n");
776 ret = -EBUSY;
777 break;
778 }
779 if (skt->state & SOCKET_CARDBUS) {
780 dev_dbg(&skt->dev, "can't reset, is cardbus\n");
781 ret = -EPERM;
782 break;
783 }
784
785 if (skt->callback)
786 skt->callback->suspend(skt);
787 mutex_lock(&skt->ops_mutex);
788 ret = socket_reset(skt);
789 mutex_unlock(&skt->ops_mutex);
790 if ((ret == 0) && (skt->callback))
791 skt->callback->resume(skt);
792
793 ret = 0;
794 } while (0);
795 mutex_unlock(&skt->skt_mutex);
796
797 return ret;
798} /* reset_card */
799EXPORT_SYMBOL(pcmcia_reset_card);
800
801
802static int pcmcia_socket_uevent(struct device *dev,
803 struct kobj_uevent_env *env)
804{
805 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
806
807 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
808 return -ENOMEM;
809
810 return 0;
811}
812
813
814static struct completion pcmcia_unload;
815
816static void pcmcia_release_socket_class(struct class *data)
817{
818 complete(&pcmcia_unload);
819}
820
821
822#ifdef CONFIG_PM
823
824static int __pcmcia_pm_op(struct device *dev,
825 int (*callback) (struct pcmcia_socket *skt))
826{
827 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
828 int ret;
829
830 mutex_lock(&s->skt_mutex);
831 ret = callback(s);
832 mutex_unlock(&s->skt_mutex);
833
834 return ret;
835}
836
837static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
838{
839 return __pcmcia_pm_op(dev, socket_suspend);
840}
841
842static int pcmcia_socket_dev_resume_noirq(struct device *dev)
843{
844 return __pcmcia_pm_op(dev, socket_early_resume);
845}
846
847static int __used pcmcia_socket_dev_resume(struct device *dev)
848{
849 return __pcmcia_pm_op(dev, socket_late_resume);
850}
851
852static const struct dev_pm_ops pcmcia_socket_pm_ops = {
853 /* dev_resume may be called with IRQs enabled */
854 SET_SYSTEM_SLEEP_PM_OPS(NULL,
855 pcmcia_socket_dev_resume)
856
857 /* late suspend must be called with IRQs disabled */
858 .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
859 .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
860 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
861
862 /* early resume must be called with IRQs disabled */
863 .resume_noirq = pcmcia_socket_dev_resume_noirq,
864 .thaw_noirq = pcmcia_socket_dev_resume_noirq,
865 .restore_noirq = pcmcia_socket_dev_resume_noirq,
866};
867
868#define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
869
870#else /* CONFIG_PM */
871
872#define PCMCIA_SOCKET_CLASS_PM_OPS NULL
873
874#endif /* CONFIG_PM */
875
876struct class pcmcia_socket_class = {
877 .name = "pcmcia_socket",
878 .dev_uevent = pcmcia_socket_uevent,
879 .dev_release = pcmcia_release_socket,
880 .class_release = pcmcia_release_socket_class,
881 .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
882};
883EXPORT_SYMBOL(pcmcia_socket_class);
884
885
886static int __init init_pcmcia_cs(void)
887{
888 init_completion(&pcmcia_unload);
889 return class_register(&pcmcia_socket_class);
890}
891
892static void __exit exit_pcmcia_cs(void)
893{
894 class_unregister(&pcmcia_socket_class);
895 wait_for_completion(&pcmcia_unload);
896}
897
898subsys_initcall(init_pcmcia_cs);
899module_exit(exit_pcmcia_cs);
900
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
40MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
41MODULE_DESCRIPTION("Linux Kernel Card Services");
42MODULE_LICENSE("GPL");
43
44#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
45
46INT_MODULE_PARM(setup_delay, 10); /* centiseconds */
47INT_MODULE_PARM(resume_delay, 20); /* centiseconds */
48INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */
49INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */
50INT_MODULE_PARM(reset_time, 10); /* usecs */
51INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */
52INT_MODULE_PARM(unreset_check, 10); /* centiseconds */
53INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */
54
55/* Access speed for attribute memory windows */
56INT_MODULE_PARM(cis_speed, 300); /* ns */
57
58
59socket_state_t dead_socket = {
60 .csc_mask = SS_DETECT,
61};
62EXPORT_SYMBOL(dead_socket);
63
64
65/* List of all sockets, protected by a rwsem */
66LIST_HEAD(pcmcia_socket_list);
67EXPORT_SYMBOL(pcmcia_socket_list);
68
69DECLARE_RWSEM(pcmcia_socket_list_rwsem);
70EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
71
72
73struct 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}
80EXPORT_SYMBOL(pcmcia_get_socket);
81
82
83void pcmcia_put_socket(struct pcmcia_socket *skt)
84{
85 put_device(&skt->dev);
86}
87EXPORT_SYMBOL(pcmcia_put_socket);
88
89
90static 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
97static int pccardd(void *__skt);
98
99/**
100 * pcmcia_register_socket - add a new pcmcia socket device
101 * @socket: the &socket to register
102 */
103int 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 */
199EXPORT_SYMBOL(pcmcia_register_socket);
200
201
202/**
203 * pcmcia_unregister_socket - remove a pcmcia socket device
204 * @socket: the &socket to unregister
205 */
206void 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 */
229EXPORT_SYMBOL(pcmcia_unregister_socket);
230
231
232struct 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}
247EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
248
249static 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 */
285static 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
332static 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 */
410static 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
450static 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
470static 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
483static 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 */
522static 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 */
544static 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
557static 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 */
574static 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
592static 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 return 0;
609 }
610 ret = pccard_sysfs_add_socket(&skt->dev);
611 if (ret)
612 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
613
614 complete(&skt->thread_done);
615
616 /* wait for userspace to catch up */
617 msleep(250);
618
619 set_freezable();
620 for (;;) {
621 unsigned long flags;
622 unsigned int events;
623 unsigned int sysfs_events;
624
625 spin_lock_irqsave(&skt->thread_lock, flags);
626 events = skt->thread_events;
627 skt->thread_events = 0;
628 sysfs_events = skt->sysfs_events;
629 skt->sysfs_events = 0;
630 spin_unlock_irqrestore(&skt->thread_lock, flags);
631
632 mutex_lock(&skt->skt_mutex);
633 if (events & SS_DETECT)
634 socket_detect_change(skt);
635
636 if (sysfs_events) {
637 if (sysfs_events & PCMCIA_UEVENT_EJECT)
638 socket_remove(skt);
639 if (sysfs_events & PCMCIA_UEVENT_INSERT)
640 socket_insert(skt);
641 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
642 !(skt->state & SOCKET_CARDBUS)) {
643 if (skt->callback)
644 ret = skt->callback->suspend(skt);
645 else
646 ret = 0;
647 if (!ret) {
648 socket_suspend(skt);
649 msleep(100);
650 }
651 }
652 if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
653 !(skt->state & SOCKET_CARDBUS)) {
654 ret = socket_resume(skt);
655 if (!ret && skt->callback)
656 skt->callback->resume(skt);
657 }
658 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
659 !(skt->state & SOCKET_CARDBUS)) {
660 if (!ret && skt->callback)
661 skt->callback->requery(skt);
662 }
663 }
664 mutex_unlock(&skt->skt_mutex);
665
666 if (events || sysfs_events)
667 continue;
668
669 set_current_state(TASK_INTERRUPTIBLE);
670 if (kthread_should_stop())
671 break;
672
673 schedule();
674
675 try_to_freeze();
676 }
677 /* make sure we are running before we exit */
678 __set_current_state(TASK_RUNNING);
679
680 /* shut down socket, if a device is still present */
681 if (skt->state & SOCKET_PRESENT) {
682 mutex_lock(&skt->skt_mutex);
683 socket_remove(skt);
684 mutex_unlock(&skt->skt_mutex);
685 }
686
687 /* remove from the device core */
688 pccard_sysfs_remove_socket(&skt->dev);
689 device_unregister(&skt->dev);
690
691 return 0;
692}
693
694/*
695 * Yenta (at least) probes interrupts before registering the socket and
696 * starting the handler thread.
697 */
698void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
699{
700 unsigned long flags;
701 dev_dbg(&s->dev, "parse_events: events %08x\n", events);
702 if (s->thread) {
703 spin_lock_irqsave(&s->thread_lock, flags);
704 s->thread_events |= events;
705 spin_unlock_irqrestore(&s->thread_lock, flags);
706
707 wake_up_process(s->thread);
708 }
709} /* pcmcia_parse_events */
710EXPORT_SYMBOL(pcmcia_parse_events);
711
712/**
713 * pcmcia_parse_uevents() - tell pccardd to issue manual commands
714 * @s: the PCMCIA socket we wan't to command
715 * @events: events to pass to pccardd
716 *
717 * userspace-issued insert, eject, suspend and resume commands must be
718 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
719 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
720 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
721 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
722 */
723void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
724{
725 unsigned long flags;
726 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
727 if (s->thread) {
728 spin_lock_irqsave(&s->thread_lock, flags);
729 s->sysfs_events |= events;
730 spin_unlock_irqrestore(&s->thread_lock, flags);
731
732 wake_up_process(s->thread);
733 }
734}
735EXPORT_SYMBOL(pcmcia_parse_uevents);
736
737
738/* register pcmcia_callback */
739int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
740{
741 int ret = 0;
742
743 /* s->skt_mutex also protects s->callback */
744 mutex_lock(&s->skt_mutex);
745
746 if (c) {
747 /* registration */
748 if (s->callback) {
749 ret = -EBUSY;
750 goto err;
751 }
752
753 s->callback = c;
754
755 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
756 s->callback->add(s);
757 } else
758 s->callback = NULL;
759 err:
760 mutex_unlock(&s->skt_mutex);
761
762 return ret;
763}
764EXPORT_SYMBOL(pccard_register_pcmcia);
765
766
767/* I'm not sure which "reset" function this is supposed to use,
768 * but for now, it uses the low-level interface's reset, not the
769 * CIS register.
770 */
771
772int pcmcia_reset_card(struct pcmcia_socket *skt)
773{
774 int ret;
775
776 dev_dbg(&skt->dev, "resetting socket\n");
777
778 mutex_lock(&skt->skt_mutex);
779 do {
780 if (!(skt->state & SOCKET_PRESENT)) {
781 dev_dbg(&skt->dev, "can't reset, not present\n");
782 ret = -ENODEV;
783 break;
784 }
785 if (skt->state & SOCKET_SUSPEND) {
786 dev_dbg(&skt->dev, "can't reset, suspended\n");
787 ret = -EBUSY;
788 break;
789 }
790 if (skt->state & SOCKET_CARDBUS) {
791 dev_dbg(&skt->dev, "can't reset, is cardbus\n");
792 ret = -EPERM;
793 break;
794 }
795
796 if (skt->callback)
797 skt->callback->suspend(skt);
798 mutex_lock(&skt->ops_mutex);
799 ret = socket_reset(skt);
800 mutex_unlock(&skt->ops_mutex);
801 if ((ret == 0) && (skt->callback))
802 skt->callback->resume(skt);
803
804 ret = 0;
805 } while (0);
806 mutex_unlock(&skt->skt_mutex);
807
808 return ret;
809} /* reset_card */
810EXPORT_SYMBOL(pcmcia_reset_card);
811
812
813static int pcmcia_socket_uevent(const struct device *dev,
814 struct kobj_uevent_env *env)
815{
816 const struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
817
818 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
819 return -ENOMEM;
820
821 return 0;
822}
823
824
825static struct completion pcmcia_unload;
826
827static void pcmcia_release_socket_class(struct class *data)
828{
829 complete(&pcmcia_unload);
830}
831
832
833#ifdef CONFIG_PM
834
835static int __pcmcia_pm_op(struct device *dev,
836 int (*callback) (struct pcmcia_socket *skt))
837{
838 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
839 int ret;
840
841 mutex_lock(&s->skt_mutex);
842 ret = callback(s);
843 mutex_unlock(&s->skt_mutex);
844
845 return ret;
846}
847
848static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
849{
850 return __pcmcia_pm_op(dev, socket_suspend);
851}
852
853static int pcmcia_socket_dev_resume_noirq(struct device *dev)
854{
855 return __pcmcia_pm_op(dev, socket_early_resume);
856}
857
858static int __used pcmcia_socket_dev_resume(struct device *dev)
859{
860 return __pcmcia_pm_op(dev, socket_late_resume);
861}
862
863static void __used pcmcia_socket_dev_complete(struct device *dev)
864{
865 WARN(__pcmcia_pm_op(dev, socket_complete_resume),
866 "failed to complete resume");
867}
868
869static const struct dev_pm_ops pcmcia_socket_pm_ops = {
870 /* dev_resume may be called with IRQs enabled */
871 SET_SYSTEM_SLEEP_PM_OPS(NULL,
872 pcmcia_socket_dev_resume)
873
874 /* late suspend must be called with IRQs disabled */
875 .suspend_noirq = pcmcia_socket_dev_suspend_noirq,
876 .freeze_noirq = pcmcia_socket_dev_suspend_noirq,
877 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
878
879 /* early resume must be called with IRQs disabled */
880 .resume_noirq = pcmcia_socket_dev_resume_noirq,
881 .thaw_noirq = pcmcia_socket_dev_resume_noirq,
882 .restore_noirq = pcmcia_socket_dev_resume_noirq,
883 .complete = pcmcia_socket_dev_complete,
884};
885
886#define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
887
888#else /* CONFIG_PM */
889
890#define PCMCIA_SOCKET_CLASS_PM_OPS NULL
891
892#endif /* CONFIG_PM */
893
894struct class pcmcia_socket_class = {
895 .name = "pcmcia_socket",
896 .dev_uevent = pcmcia_socket_uevent,
897 .dev_release = pcmcia_release_socket,
898 .class_release = pcmcia_release_socket_class,
899 .pm = PCMCIA_SOCKET_CLASS_PM_OPS,
900};
901EXPORT_SYMBOL(pcmcia_socket_class);
902
903
904static int __init init_pcmcia_cs(void)
905{
906 init_completion(&pcmcia_unload);
907 return class_register(&pcmcia_socket_class);
908}
909
910static void __exit exit_pcmcia_cs(void)
911{
912 class_unregister(&pcmcia_socket_class);
913 wait_for_completion(&pcmcia_unload);
914}
915
916subsys_initcall(init_pcmcia_cs);
917module_exit(exit_pcmcia_cs);
918