cs.c

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