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		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 */
699void 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 */
711EXPORT_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 */
724void 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}
736EXPORT_SYMBOL(pcmcia_parse_uevents);
737
738
739/* register pcmcia_callback */
740int 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}
765EXPORT_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
773int 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 */
811EXPORT_SYMBOL(pcmcia_reset_card);
812
813
814static 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
826static struct completion pcmcia_unload;
827
828static void pcmcia_release_socket_class(const struct class *data)
829{
830	complete(&pcmcia_unload);
831}
832
833
834#ifdef CONFIG_PM
835
836static 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
849static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
850{
851	return __pcmcia_pm_op(dev, socket_suspend);
852}
853
854static int pcmcia_socket_dev_resume_noirq(struct device *dev)
855{
856	return __pcmcia_pm_op(dev, socket_early_resume);
857}
858
859static int __used pcmcia_socket_dev_resume(struct device *dev)
860{
861	return __pcmcia_pm_op(dev, socket_late_resume);
862}
863
864static 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
870static 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
895const 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};
902EXPORT_SYMBOL(pcmcia_socket_class);
903
904
905static int __init init_pcmcia_cs(void)
906{
907	init_completion(&pcmcia_unload);
908	return class_register(&pcmcia_socket_class);
909}
910
911static void __exit exit_pcmcia_cs(void)
912{
913	class_unregister(&pcmcia_socket_class);
914	wait_for_completion(&pcmcia_unload);
915}
916
917subsys_initcall(init_pcmcia_cs);
918module_exit(exit_pcmcia_cs);
919
920