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/irq.h>
33
34#include <pcmcia/ss.h>
35#include <pcmcia/cistpl.h>
36#include <pcmcia/cisreg.h>
37#include <pcmcia/ds.h>
38#include "cs_internal.h"
39
40
41/* Module parameters */
42
43MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
44MODULE_DESCRIPTION("Linux Kernel Card Services");
45MODULE_LICENSE("GPL");
46
47#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
48
49INT_MODULE_PARM(setup_delay,	10);		/* centiseconds */
50INT_MODULE_PARM(resume_delay,	20);		/* centiseconds */
51INT_MODULE_PARM(shutdown_delay,	3);		/* centiseconds */
52INT_MODULE_PARM(vcc_settle,	40);		/* centiseconds */
53INT_MODULE_PARM(reset_time,	10);		/* usecs */
54INT_MODULE_PARM(unreset_delay,	10);		/* centiseconds */
55INT_MODULE_PARM(unreset_check,	10);		/* centiseconds */
56INT_MODULE_PARM(unreset_limit,	30);		/* unreset_check's */
57
58/* Access speed for attribute memory windows */
59INT_MODULE_PARM(cis_speed,	300);		/* ns */
60
61
62socket_state_t dead_socket = {
63	.csc_mask	= SS_DETECT,
64};
65EXPORT_SYMBOL(dead_socket);
66
67
68/* List of all sockets, protected by a rwsem */
69LIST_HEAD(pcmcia_socket_list);
70EXPORT_SYMBOL(pcmcia_socket_list);
71
72DECLARE_RWSEM(pcmcia_socket_list_rwsem);
73EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
74
75
76struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
77{
78	struct device *dev = get_device(&skt->dev);
79	if (!dev)
80		return NULL;
81	return dev_get_drvdata(dev);
82}
83EXPORT_SYMBOL(pcmcia_get_socket);
84
85
86void pcmcia_put_socket(struct pcmcia_socket *skt)
87{
88	put_device(&skt->dev);
89}
90EXPORT_SYMBOL(pcmcia_put_socket);
91
92
93static void pcmcia_release_socket(struct device *dev)
94{
95	struct pcmcia_socket *socket = dev_get_drvdata(dev);
96
97	complete(&socket->socket_released);
98}
99
100static int pccardd(void *__skt);
101
102/**
103 * pcmcia_register_socket - add a new pcmcia socket device
104 * @socket: the &socket to register
105 */
106int pcmcia_register_socket(struct pcmcia_socket *socket)
107{
108	struct task_struct *tsk;
109	int ret;
110
111	if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
112		return -EINVAL;
113
114	dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
115
116	/* try to obtain a socket number [yes, it gets ugly if we
117	 * register more than 2^sizeof(unsigned int) pcmcia
118	 * sockets... but the socket number is deprecated
119	 * anyways, so I don't care] */
120	down_write(&pcmcia_socket_list_rwsem);
121	if (list_empty(&pcmcia_socket_list))
122		socket->sock = 0;
123	else {
124		unsigned int found, i = 1;
125		struct pcmcia_socket *tmp;
126		do {
127			found = 1;
128			list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
129				if (tmp->sock == i)
130					found = 0;
131			}
132			i++;
133		} while (!found);
134		socket->sock = i - 1;
135	}
136	list_add_tail(&socket->socket_list, &pcmcia_socket_list);
137	up_write(&pcmcia_socket_list_rwsem);
138
139#ifndef CONFIG_CARDBUS
140	/*
141	 * If we do not support Cardbus, ensure that
142	 * the Cardbus socket capability is disabled.
143	 */
144	socket->features &= ~SS_CAP_CARDBUS;
145#endif
146
147	/* set proper values in socket->dev */
148	dev_set_drvdata(&socket->dev, socket);
149	socket->dev.class = &pcmcia_socket_class;
150	dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
151
152	/* base address = 0, map = 0 */
153	socket->cis_mem.flags = 0;
154	socket->cis_mem.speed = cis_speed;
155
156	INIT_LIST_HEAD(&socket->cis_cache);
157
158	init_completion(&socket->socket_released);
159	init_completion(&socket->thread_done);
160	mutex_init(&socket->skt_mutex);
161	mutex_init(&socket->ops_mutex);
162	spin_lock_init(&socket->thread_lock);
163
164	if (socket->resource_ops->init) {
165		mutex_lock(&socket->ops_mutex);
166		ret = socket->resource_ops->init(socket);
167		mutex_unlock(&socket->ops_mutex);
168		if (ret)
169			goto err;
170	}
171
172	tsk = kthread_run(pccardd, socket, "pccardd");
173	if (IS_ERR(tsk)) {
174		ret = PTR_ERR(tsk);
175		goto err;
176	}
177
178	wait_for_completion(&socket->thread_done);
179	if (!socket->thread) {
180		dev_printk(KERN_WARNING, &socket->dev,
181			   "PCMCIA: warning: socket thread did not start\n");
182		return -EIO;
183	}
184
185	pcmcia_parse_events(socket, SS_DETECT);
186
187	/*
188	 * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
189	 * If it fails, it doesn't matter -- we still have 32-bit CardBus
190	 * support to offer, so this is not a failure mode.
191	 */
192	request_module_nowait("pcmcia");
193
194	return 0;
195
196 err:
197	down_write(&pcmcia_socket_list_rwsem);
198	list_del(&socket->socket_list);
199	up_write(&pcmcia_socket_list_rwsem);
200	return ret;
201} /* pcmcia_register_socket */
202EXPORT_SYMBOL(pcmcia_register_socket);
203
204
205/**
206 * pcmcia_unregister_socket - remove a pcmcia socket device
207 * @socket: the &socket to unregister
208 */
209void pcmcia_unregister_socket(struct pcmcia_socket *socket)
210{
211	if (!socket)
212		return;
213
214	dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
215
216	if (socket->thread)
217		kthread_stop(socket->thread);
218
219	/* remove from our own list */
220	down_write(&pcmcia_socket_list_rwsem);
221	list_del(&socket->socket_list);
222	up_write(&pcmcia_socket_list_rwsem);
223
224	/* wait for sysfs to drop all references */
225	if (socket->resource_ops->exit) {
226		mutex_lock(&socket->ops_mutex);
227		socket->resource_ops->exit(socket);
228		mutex_unlock(&socket->ops_mutex);
229	}
230	wait_for_completion(&socket->socket_released);
231} /* pcmcia_unregister_socket */
232EXPORT_SYMBOL(pcmcia_unregister_socket);
233
234
235struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
236{
237	struct pcmcia_socket *s;
238
239	down_read(&pcmcia_socket_list_rwsem);
240	list_for_each_entry(s, &pcmcia_socket_list, socket_list)
241		if (s->sock == nr) {
242			up_read(&pcmcia_socket_list_rwsem);
243			return s;
244		}
245	up_read(&pcmcia_socket_list_rwsem);
246
247	return NULL;
248
249}
250EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
251
252static int socket_reset(struct pcmcia_socket *skt)
253{
254	int status, i;
255
256	dev_dbg(&skt->dev, "reset\n");
257
258	skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
259	skt->ops->set_socket(skt, &skt->socket);
260	udelay((long)reset_time);
261
262	skt->socket.flags &= ~SS_RESET;
263	skt->ops->set_socket(skt, &skt->socket);
264
265	msleep(unreset_delay * 10);
266	for (i = 0; i < unreset_limit; i++) {
267		skt->ops->get_status(skt, &status);
268
269		if (!(status & SS_DETECT))
270			return -ENODEV;
271
272		if (status & SS_READY)
273			return 0;
274
275		msleep(unreset_check * 10);
276	}
277
278	dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
279	return -ETIMEDOUT;
280}
281
282/*
283 * socket_setup() and socket_shutdown() are called by the main event handler
284 * when card insertion and removal events are received.
285 * socket_setup() turns on socket power and resets the socket, in two stages.
286 * socket_shutdown() unconfigures a socket and turns off socket power.
287 */
288static void socket_shutdown(struct pcmcia_socket *s)
289{
290	int status;
291
292	dev_dbg(&s->dev, "shutdown\n");
293
294	if (s->callback)
295		s->callback->remove(s);
296
297	mutex_lock(&s->ops_mutex);
298	s->state &= SOCKET_INUSE | SOCKET_PRESENT;
299	msleep(shutdown_delay * 10);
300	s->state &= SOCKET_INUSE;
301
302	/* Blank out the socket state */
303	s->socket = dead_socket;
304	s->ops->init(s);
305	s->ops->set_socket(s, &s->socket);
306	s->lock_count = 0;
307	kfree(s->fake_cis);
308	s->fake_cis = NULL;
309	s->functions = 0;
310
311	/* From here on we can be sure that only we (that is, the
312	 * pccardd thread) accesses this socket, and all (16-bit)
313	 * PCMCIA interactions are gone. Therefore, release
314	 * ops_mutex so that we don't get a sysfs-related lockdep
315	 * warning.
316	 */
317	mutex_unlock(&s->ops_mutex);
318
319#ifdef CONFIG_CARDBUS
320	cb_free(s);
321#endif
322
323	/* give socket some time to power down */
324	msleep(100);
325
326	s->ops->get_status(s, &status);
327	if (status & SS_POWERON) {
328		dev_printk(KERN_ERR, &s->dev,
329			   "*** DANGER *** unable to remove socket power\n");
330	}
331
332	s->state &= ~SOCKET_INUSE;
333}
334
335static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
336{
337	int status, i;
338
339	dev_dbg(&skt->dev, "setup\n");
340
341	skt->ops->get_status(skt, &status);
342	if (!(status & SS_DETECT))
343		return -ENODEV;
344
345	msleep(initial_delay * 10);
346
347	for (i = 0; i < 100; i++) {
348		skt->ops->get_status(skt, &status);
349		if (!(status & SS_DETECT))
350			return -ENODEV;
351
352		if (!(status & SS_PENDING))
353			break;
354
355		msleep(100);
356	}
357
358	if (status & SS_PENDING) {
359		dev_printk(KERN_ERR, &skt->dev,
360			   "voltage interrogation timed out.\n");
361		return -ETIMEDOUT;
362	}
363
364	if (status & SS_CARDBUS) {
365		if (!(skt->features & SS_CAP_CARDBUS)) {
366			dev_printk(KERN_ERR, &skt->dev,
367				"cardbus cards are not supported.\n");
368			return -EINVAL;
369		}
370		skt->state |= SOCKET_CARDBUS;
371	} else
372		skt->state &= ~SOCKET_CARDBUS;
373
374	/*
375	 * Decode the card voltage requirements, and apply power to the card.
376	 */
377	if (status & SS_3VCARD)
378		skt->socket.Vcc = skt->socket.Vpp = 33;
379	else if (!(status & SS_XVCARD))
380		skt->socket.Vcc = skt->socket.Vpp = 50;
381	else {
382		dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
383		return -EIO;
384	}
385
386	if (skt->power_hook)
387		skt->power_hook(skt, HOOK_POWER_PRE);
388
389	skt->socket.flags = 0;
390	skt->ops->set_socket(skt, &skt->socket);
391
392	/*
393	 * Wait "vcc_settle" for the supply to stabilise.
394	 */
395	msleep(vcc_settle * 10);
396
397	skt->ops->get_status(skt, &status);
398	if (!(status & SS_POWERON)) {
399		dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
400		return -EIO;
401	}
402
403	status = socket_reset(skt);
404
405	if (skt->power_hook)
406		skt->power_hook(skt, HOOK_POWER_POST);
407
408	return status;
409}
410
411/*
412 * Handle card insertion.  Setup the socket, reset the card,
413 * and then tell the rest of PCMCIA that a card is present.
414 */
415static int socket_insert(struct pcmcia_socket *skt)
416{
417	int ret;
418
419	dev_dbg(&skt->dev, "insert\n");
420
421	mutex_lock(&skt->ops_mutex);
422	if (skt->state & SOCKET_INUSE) {
423		mutex_unlock(&skt->ops_mutex);
424		return -EINVAL;
425	}
426	skt->state |= SOCKET_INUSE;
427
428	ret = socket_setup(skt, setup_delay);
429	if (ret == 0) {
430		skt->state |= SOCKET_PRESENT;
431
432		dev_printk(KERN_NOTICE, &skt->dev,
433			   "pccard: %s card inserted into slot %d\n",
434			   (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
435			   skt->sock);
436
437#ifdef CONFIG_CARDBUS
438		if (skt->state & SOCKET_CARDBUS) {
439			cb_alloc(skt);
440			skt->state |= SOCKET_CARDBUS_CONFIG;
441		}
442#endif
443		dev_dbg(&skt->dev, "insert done\n");
444		mutex_unlock(&skt->ops_mutex);
445
446		if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
447			skt->callback->add(skt);
448	} else {
449		mutex_unlock(&skt->ops_mutex);
450		socket_shutdown(skt);
451	}
452
453	return ret;
454}
455
456static int socket_suspend(struct pcmcia_socket *skt)
457{
458	if (skt->state & SOCKET_SUSPEND)
459		return -EBUSY;
460
461	mutex_lock(&skt->ops_mutex);
462	skt->suspended_state = skt->state;
463
464	skt->socket = dead_socket;
465	skt->ops->set_socket(skt, &skt->socket);
466	if (skt->ops->suspend)
467		skt->ops->suspend(skt);
468	skt->state |= SOCKET_SUSPEND;
469	mutex_unlock(&skt->ops_mutex);
470	return 0;
471}
472
473static int socket_early_resume(struct pcmcia_socket *skt)
474{
475	mutex_lock(&skt->ops_mutex);
476	skt->socket = dead_socket;
477	skt->ops->init(skt);
478	skt->ops->set_socket(skt, &skt->socket);
479	if (skt->state & SOCKET_PRESENT)
480		skt->resume_status = socket_setup(skt, resume_delay);
481	mutex_unlock(&skt->ops_mutex);
482	return 0;
483}
484
485static int socket_late_resume(struct pcmcia_socket *skt)
486{
487	int ret = 0;
488
489	mutex_lock(&skt->ops_mutex);
490	skt->state &= ~SOCKET_SUSPEND;
491	mutex_unlock(&skt->ops_mutex);
492
493	if (!(skt->state & SOCKET_PRESENT)) {
494		ret = socket_insert(skt);
495		if (ret == -ENODEV)
496			ret = 0;
497		return ret;
498	}
499
500	if (skt->resume_status) {
501		socket_shutdown(skt);
502		return 0;
503	}
504
505	if (skt->suspended_state != skt->state) {
506		dev_dbg(&skt->dev,
507			"suspend state 0x%x != resume state 0x%x\n",
508			skt->suspended_state, skt->state);
509
510		socket_shutdown(skt);
511		return socket_insert(skt);
512	}
513
514	if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
515		ret = skt->callback->early_resume(skt);
516	return ret;
517}
518
519/*
520 * Finalize the resume. In case of a cardbus socket, we have
521 * to rebind the devices as we can't be certain that it has been
522 * replaced, or not.
523 */
524static int socket_complete_resume(struct pcmcia_socket *skt)
525{
526	int ret = 0;
527#ifdef CONFIG_CARDBUS
528	if (skt->state & SOCKET_CARDBUS) {
529		/* We can't be sure the CardBus card is the same
530		 * as the one previously inserted. Therefore, remove
531		 * and re-add... */
532		cb_free(skt);
533		ret = cb_alloc(skt);
534		if (ret)
535			cb_free(skt);
536	}
537#endif
538	return ret;
539}
540
541/*
542 * Resume a socket.  If a card is present, verify its CIS against
543 * our cached copy.  If they are different, the card has been
544 * replaced, and we need to tell the drivers.
545 */
546static int socket_resume(struct pcmcia_socket *skt)
547{
548	int err;
549	if (!(skt->state & SOCKET_SUSPEND))
550		return -EBUSY;
551
552	socket_early_resume(skt);
553	err = socket_late_resume(skt);
554	if (!err)
555		err = socket_complete_resume(skt);
556	return err;
557}
558
559static void socket_remove(struct pcmcia_socket *skt)
560{
561	dev_printk(KERN_NOTICE, &skt->dev,
562		   "pccard: card ejected from slot %d\n", skt->sock);
563	socket_shutdown(skt);
564}
565
566/*
567 * Process a socket card detect status change.
568 *
569 * If we don't have a card already present, delay the detect event for
570 * about 20ms (to be on the safe side) before reading the socket status.
571 *
572 * Some i82365-based systems send multiple SS_DETECT events during card
573 * insertion, and the "card present" status bit seems to bounce.  This
574 * will probably be true with GPIO-based card detection systems after
575 * the product has aged.
576 */
577static void socket_detect_change(struct pcmcia_socket *skt)
578{
579	if (!(skt->state & SOCKET_SUSPEND)) {
580		int status;
581
582		if (!(skt->state & SOCKET_PRESENT))
583			msleep(20);
584
585		skt->ops->get_status(skt, &status);
586		if ((skt->state & SOCKET_PRESENT) &&
587		     !(status & SS_DETECT))
588			socket_remove(skt);
589		if (!(skt->state & SOCKET_PRESENT) &&
590		    (status & SS_DETECT))
591			socket_insert(skt);
592	}
593}
594
595static int pccardd(void *__skt)
596{
597	struct pcmcia_socket *skt = __skt;
598	int ret;
599
600	skt->thread = current;
601	skt->socket = dead_socket;
602	skt->ops->init(skt);
603	skt->ops->set_socket(skt, &skt->socket);
604
605	/* register with the device core */
606	ret = device_register(&skt->dev);
607	if (ret) {
608		dev_printk(KERN_WARNING, &skt->dev,
609			   "PCMCIA: unable to register socket\n");
610		skt->thread = NULL;
611		complete(&skt->thread_done);
612		return 0;
613	}
614	ret = pccard_sysfs_add_socket(&skt->dev);
615	if (ret)
616		dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
617
618	complete(&skt->thread_done);
619
620	/* wait for userspace to catch up */
621	msleep(250);
622
623	set_freezable();
624	for (;;) {
625		unsigned long flags;
626		unsigned int events;
627		unsigned int sysfs_events;
628
629		set_current_state(TASK_INTERRUPTIBLE);
630
631		spin_lock_irqsave(&skt->thread_lock, flags);
632		events = skt->thread_events;
633		skt->thread_events = 0;
634		sysfs_events = skt->sysfs_events;
635		skt->sysfs_events = 0;
636		spin_unlock_irqrestore(&skt->thread_lock, flags);
637
638		mutex_lock(&skt->skt_mutex);
639		if (events & SS_DETECT)
640			socket_detect_change(skt);
641
642		if (sysfs_events) {
643			if (sysfs_events & PCMCIA_UEVENT_EJECT)
644				socket_remove(skt);
645			if (sysfs_events & PCMCIA_UEVENT_INSERT)
646				socket_insert(skt);
647			if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
648				!(skt->state & SOCKET_CARDBUS)) {
649				if (skt->callback)
650					ret = skt->callback->suspend(skt);
651				else
652					ret = 0;
653				if (!ret) {
654					socket_suspend(skt);
655					msleep(100);
656				}
657			}
658			if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
659				!(skt->state & SOCKET_CARDBUS)) {
660				ret = socket_resume(skt);
661				if (!ret && skt->callback)
662					skt->callback->resume(skt);
663			}
664			if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
665				!(skt->state & SOCKET_CARDBUS)) {
666				if (!ret && skt->callback)
667					skt->callback->requery(skt);
668			}
669		}
670		mutex_unlock(&skt->skt_mutex);
671
672		if (events || sysfs_events)
673			continue;
674
675		if (kthread_should_stop())
676			break;
677
678		schedule();
679		try_to_freeze();
680	}
681	/* make sure we are running before we exit */
682	set_current_state(TASK_RUNNING);
683
684	/* shut down socket, if a device is still present */
685	if (skt->state & SOCKET_PRESENT) {
686		mutex_lock(&skt->skt_mutex);
687		socket_remove(skt);
688		mutex_unlock(&skt->skt_mutex);
689	}
690
691	/* remove from the device core */
692	pccard_sysfs_remove_socket(&skt->dev);
693	device_unregister(&skt->dev);
694
695	return 0;
696}
697
698/*
699 * Yenta (at least) probes interrupts before registering the socket and
700 * starting the handler thread.
701 */
702void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
703{
704	unsigned long flags;
705	dev_dbg(&s->dev, "parse_events: events %08x\n", events);
706	if (s->thread) {
707		spin_lock_irqsave(&s->thread_lock, flags);
708		s->thread_events |= events;
709		spin_unlock_irqrestore(&s->thread_lock, flags);
710
711		wake_up_process(s->thread);
712	}
713} /* pcmcia_parse_events */
714EXPORT_SYMBOL(pcmcia_parse_events);
715
716/**
717 * pcmcia_parse_uevents() - tell pccardd to issue manual commands
718 * @s:		the PCMCIA socket we wan't to command
719 * @events:	events to pass to pccardd
720 *
721 * userspace-issued insert, eject, suspend and resume commands must be
722 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
723 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
724 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
725 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
726 */
727void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
728{
729	unsigned long flags;
730	dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
731	if (s->thread) {
732		spin_lock_irqsave(&s->thread_lock, flags);
733		s->sysfs_events |= events;
734		spin_unlock_irqrestore(&s->thread_lock, flags);
735
736		wake_up_process(s->thread);
737	}
738}
739EXPORT_SYMBOL(pcmcia_parse_uevents);
740
741
742/* register pcmcia_callback */
743int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
744{
745	int ret = 0;
746
747	/* s->skt_mutex also protects s->callback */
748	mutex_lock(&s->skt_mutex);
749
750	if (c) {
751		/* registration */
752		if (s->callback) {
753			ret = -EBUSY;
754			goto err;
755		}
756
757		s->callback = c;
758
759		if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
760			s->callback->add(s);
761	} else
762		s->callback = NULL;
763 err:
764	mutex_unlock(&s->skt_mutex);
765
766	return ret;
767}
768EXPORT_SYMBOL(pccard_register_pcmcia);
769
770
771/* I'm not sure which "reset" function this is supposed to use,
772 * but for now, it uses the low-level interface's reset, not the
773 * CIS register.
774 */
775
776int pcmcia_reset_card(struct pcmcia_socket *skt)
777{
778	int ret;
779
780	dev_dbg(&skt->dev, "resetting socket\n");
781
782	mutex_lock(&skt->skt_mutex);
783	do {
784		if (!(skt->state & SOCKET_PRESENT)) {
785			dev_dbg(&skt->dev, "can't reset, not present\n");
786			ret = -ENODEV;
787			break;
788		}
789		if (skt->state & SOCKET_SUSPEND) {
790			dev_dbg(&skt->dev, "can't reset, suspended\n");
791			ret = -EBUSY;
792			break;
793		}
794		if (skt->state & SOCKET_CARDBUS) {
795			dev_dbg(&skt->dev, "can't reset, is cardbus\n");
796			ret = -EPERM;
797			break;
798		}
799
800		if (skt->callback)
801			skt->callback->suspend(skt);
802		mutex_lock(&skt->ops_mutex);
803		ret = socket_reset(skt);
804		mutex_unlock(&skt->ops_mutex);
805		if ((ret == 0) && (skt->callback))
806			skt->callback->resume(skt);
807
808		ret = 0;
809	} while (0);
810	mutex_unlock(&skt->skt_mutex);
811
812	return ret;
813} /* reset_card */
814EXPORT_SYMBOL(pcmcia_reset_card);
815
816
817static int pcmcia_socket_uevent(struct device *dev,
818				struct kobj_uevent_env *env)
819{
820	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
821
822	if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
823		return -ENOMEM;
824
825	return 0;
826}
827
828
829static struct completion pcmcia_unload;
830
831static void pcmcia_release_socket_class(struct class *data)
832{
833	complete(&pcmcia_unload);
834}
835
836
837#ifdef CONFIG_PM
838
839static int __pcmcia_pm_op(struct device *dev,
840			  int (*callback) (struct pcmcia_socket *skt))
841{
842	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
843	int ret;
844
845	mutex_lock(&s->skt_mutex);
846	ret = callback(s);
847	mutex_unlock(&s->skt_mutex);
848
849	return ret;
850}
851
852static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
853{
854	return __pcmcia_pm_op(dev, socket_suspend);
855}
856
857static int pcmcia_socket_dev_resume_noirq(struct device *dev)
858{
859	return __pcmcia_pm_op(dev, socket_early_resume);
860}
861
862static int __used pcmcia_socket_dev_resume(struct device *dev)
863{
864	return __pcmcia_pm_op(dev, socket_late_resume);
865}
866
867static void __used pcmcia_socket_dev_complete(struct device *dev)
868{
869	WARN(__pcmcia_pm_op(dev, socket_complete_resume),
870		"failed to complete resume");
871}
872
873static const struct dev_pm_ops pcmcia_socket_pm_ops = {
874	/* dev_resume may be called with IRQs enabled */
875	SET_SYSTEM_SLEEP_PM_OPS(NULL,
876				pcmcia_socket_dev_resume)
877
878	/* late suspend must be called with IRQs disabled */
879	.suspend_noirq = pcmcia_socket_dev_suspend_noirq,
880	.freeze_noirq = pcmcia_socket_dev_suspend_noirq,
881	.poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
882
883	/* early resume must be called with IRQs disabled */
884	.resume_noirq = pcmcia_socket_dev_resume_noirq,
885	.thaw_noirq = pcmcia_socket_dev_resume_noirq,
886	.restore_noirq = pcmcia_socket_dev_resume_noirq,
887	.complete = pcmcia_socket_dev_complete,
888};
889
890#define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
891
892#else /* CONFIG_PM */
893
894#define PCMCIA_SOCKET_CLASS_PM_OPS NULL
895
896#endif /* CONFIG_PM */
897
898struct class pcmcia_socket_class = {
899	.name = "pcmcia_socket",
900	.dev_uevent = pcmcia_socket_uevent,
901	.dev_release = pcmcia_release_socket,
902	.class_release = pcmcia_release_socket_class,
903	.pm = PCMCIA_SOCKET_CLASS_PM_OPS,
904};
905EXPORT_SYMBOL(pcmcia_socket_class);
906
907
908static int __init init_pcmcia_cs(void)
909{
910	init_completion(&pcmcia_unload);
911	return class_register(&pcmcia_socket_class);
912}
913
914static void __exit exit_pcmcia_cs(void)
915{
916	class_unregister(&pcmcia_socket_class);
917	wait_for_completion(&pcmcia_unload);
918}
919
920subsys_initcall(init_pcmcia_cs);
921module_exit(exit_pcmcia_cs);
922
923