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/linux-2.6.21.x/drivers/pcmcia/cs.c

https://bitbucket.org/altlc/wive-rtnl-ralink-rt305x-routers-firmware-amod
C | 961 lines | 656 code | 193 blank | 112 comment | 106 complexity | 62ff8ffaff324617b35359f7ecd32e17 MD5 | raw file
  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/pci.h>
 30#include <linux/device.h>
 31#include <linux/kthread.h>
 32#include <linux/freezer.h>
 33#include <asm/system.h>
 34#include <asm/irq.h>
 35
 36#define IN_CARD_SERVICES
 37#include <pcmcia/cs_types.h>
 38#include <pcmcia/ss.h>
 39#include <pcmcia/cs.h>
 40#include <pcmcia/bulkmem.h>
 41#include <pcmcia/cistpl.h>
 42#include <pcmcia/cisreg.h>
 43#include <pcmcia/ds.h>
 44#include "cs_internal.h"
 45
 46
 47/* Module parameters */
 48
 49MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
 50MODULE_DESCRIPTION("Linux Kernel Card Services");
 51MODULE_LICENSE("GPL");
 52
 53#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
 54
 55INT_MODULE_PARM(setup_delay,	10);		/* centiseconds */
 56INT_MODULE_PARM(resume_delay,	20);		/* centiseconds */
 57INT_MODULE_PARM(shutdown_delay,	3);		/* centiseconds */
 58INT_MODULE_PARM(vcc_settle,	40);		/* centiseconds */
 59INT_MODULE_PARM(reset_time,	10);		/* usecs */
 60INT_MODULE_PARM(unreset_delay,	10);		/* centiseconds */
 61INT_MODULE_PARM(unreset_check,	10);		/* centiseconds */
 62INT_MODULE_PARM(unreset_limit,	30);		/* unreset_check's */
 63
 64/* Access speed for attribute memory windows */
 65INT_MODULE_PARM(cis_speed,	300);		/* ns */
 66
 67#ifdef DEBUG
 68static int pc_debug;
 69
 70module_param(pc_debug, int, 0644);
 71
 72int cs_debug_level(int level)
 73{
 74	return pc_debug > level;
 75}
 76#endif
 77
 78
 79socket_state_t dead_socket = {
 80	.csc_mask	= SS_DETECT,
 81};
 82EXPORT_SYMBOL(dead_socket);
 83
 84
 85/* List of all sockets, protected by a rwsem */
 86LIST_HEAD(pcmcia_socket_list);
 87EXPORT_SYMBOL(pcmcia_socket_list);
 88
 89DECLARE_RWSEM(pcmcia_socket_list_rwsem);
 90EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
 91
 92
 93/**
 94 * Low-level PCMCIA socket drivers need to register with the PCCard
 95 * core using pcmcia_register_socket.
 96 *
 97 * socket drivers are expected to use the following callbacks in their
 98 * .drv struct:
 99 *  - pcmcia_socket_dev_suspend
100 *  - pcmcia_socket_dev_resume
101 * These functions check for the appropriate struct pcmcia_soket arrays,
102 * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
103 */
104static int socket_resume(struct pcmcia_socket *skt);
105static int socket_suspend(struct pcmcia_socket *skt);
106
107int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
108{
109	struct pcmcia_socket *socket;
110
111	down_read(&pcmcia_socket_list_rwsem);
112	list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
113		if (socket->dev.parent != dev)
114			continue;
115		mutex_lock(&socket->skt_mutex);
116		socket_suspend(socket);
117		mutex_unlock(&socket->skt_mutex);
118	}
119	up_read(&pcmcia_socket_list_rwsem);
120
121	return 0;
122}
123EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
124
125int pcmcia_socket_dev_resume(struct device *dev)
126{
127	struct pcmcia_socket *socket;
128
129	down_read(&pcmcia_socket_list_rwsem);
130	list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
131		if (socket->dev.parent != dev)
132			continue;
133		mutex_lock(&socket->skt_mutex);
134		socket_resume(socket);
135		mutex_unlock(&socket->skt_mutex);
136	}
137	up_read(&pcmcia_socket_list_rwsem);
138
139	return 0;
140}
141EXPORT_SYMBOL(pcmcia_socket_dev_resume);
142
143
144struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt)
145{
146	struct device *dev = get_device(&skt->dev);
147	if (!dev)
148		return NULL;
149	skt = dev_get_drvdata(dev);
150	if (!try_module_get(skt->owner)) {
151		put_device(&skt->dev);
152		return NULL;
153	}
154	return (skt);
155}
156EXPORT_SYMBOL(pcmcia_get_socket);
157
158
159void pcmcia_put_socket(struct pcmcia_socket *skt)
160{
161	module_put(skt->owner);
162	put_device(&skt->dev);
163}
164EXPORT_SYMBOL(pcmcia_put_socket);
165
166
167static void pcmcia_release_socket(struct device *dev)
168{
169	struct pcmcia_socket *socket = dev_get_drvdata(dev);
170
171	complete(&socket->socket_released);
172}
173
174static int pccardd(void *__skt);
175
176/**
177 * pcmcia_register_socket - add a new pcmcia socket device
178 */
179int pcmcia_register_socket(struct pcmcia_socket *socket)
180{
181	struct task_struct *tsk;
182	int ret;
183
184	if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
185		return -EINVAL;
186
187	cs_dbg(socket, 0, "pcmcia_register_socket(0x%p)\n", socket->ops);
188
189	spin_lock_init(&socket->lock);
190
191	if (socket->resource_ops->init) {
192		ret = socket->resource_ops->init(socket);
193		if (ret)
194			return (ret);
195	}
196
197	/* try to obtain a socket number [yes, it gets ugly if we
198	 * register more than 2^sizeof(unsigned int) pcmcia
199	 * sockets... but the socket number is deprecated
200	 * anyways, so I don't care] */
201	down_write(&pcmcia_socket_list_rwsem);
202	if (list_empty(&pcmcia_socket_list))
203		socket->sock = 0;
204	else {
205		unsigned int found, i = 1;
206		struct pcmcia_socket *tmp;
207		do {
208			found = 1;
209			list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
210				if (tmp->sock == i)
211					found = 0;
212			}
213			i++;
214		} while (!found);
215		socket->sock = i - 1;
216	}
217	list_add_tail(&socket->socket_list, &pcmcia_socket_list);
218	up_write(&pcmcia_socket_list_rwsem);
219
220#ifndef CONFIG_CARDBUS
221	/*
222	 * If we do not support Cardbus, ensure that
223	 * the Cardbus socket capability is disabled.
224	 */
225	socket->features &= ~SS_CAP_CARDBUS;
226#endif
227
228	/* set proper values in socket->dev */
229	dev_set_drvdata(&socket->dev, socket);
230	socket->dev.class = &pcmcia_socket_class;
231	snprintf(socket->dev.bus_id, BUS_ID_SIZE, "pcmcia_socket%u", socket->sock);
232
233	/* base address = 0, map = 0 */
234	socket->cis_mem.flags = 0;
235	socket->cis_mem.speed = cis_speed;
236
237	INIT_LIST_HEAD(&socket->cis_cache);
238
239	init_completion(&socket->socket_released);
240	init_completion(&socket->thread_done);
241	init_waitqueue_head(&socket->thread_wait);
242	mutex_init(&socket->skt_mutex);
243	spin_lock_init(&socket->thread_lock);
244
245	tsk = kthread_run(pccardd, socket, "pccardd");
246	if (IS_ERR(tsk)) {
247		ret = PTR_ERR(tsk);
248		goto err;
249	}
250
251	wait_for_completion(&socket->thread_done);
252	if (!socket->thread) {
253		printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket);
254		return -EIO;
255	}
256
257	pcmcia_parse_events(socket, SS_DETECT);
258
259	return 0;
260
261 err:
262	down_write(&pcmcia_socket_list_rwsem);
263	list_del(&socket->socket_list);
264	up_write(&pcmcia_socket_list_rwsem);
265	return ret;
266} /* pcmcia_register_socket */
267EXPORT_SYMBOL(pcmcia_register_socket);
268
269
270/**
271 * pcmcia_unregister_socket - remove a pcmcia socket device
272 */
273void pcmcia_unregister_socket(struct pcmcia_socket *socket)
274{
275	if (!socket)
276		return;
277
278	cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
279
280	if (socket->thread) {
281		wake_up(&socket->thread_wait);
282		kthread_stop(socket->thread);
283	}
284	release_cis_mem(socket);
285
286	/* remove from our own list */
287	down_write(&pcmcia_socket_list_rwsem);
288	list_del(&socket->socket_list);
289	up_write(&pcmcia_socket_list_rwsem);
290
291	/* wait for sysfs to drop all references */
292	release_resource_db(socket);
293	wait_for_completion(&socket->socket_released);
294} /* pcmcia_unregister_socket */
295EXPORT_SYMBOL(pcmcia_unregister_socket);
296
297
298struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr)
299{
300	struct pcmcia_socket *s;
301
302	down_read(&pcmcia_socket_list_rwsem);
303	list_for_each_entry(s, &pcmcia_socket_list, socket_list)
304		if (s->sock == nr) {
305			up_read(&pcmcia_socket_list_rwsem);
306			return s;
307		}
308	up_read(&pcmcia_socket_list_rwsem);
309
310	return NULL;
311
312}
313EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
314
315/**
316 * The central event handler.  Send_event() sends an event to the
317 * 16-bit subsystem, which then calls the relevant device drivers.
318 * Parse_events() interprets the event bits from
319 * a card status change report.  Do_shutdown() handles the high
320 * priority stuff associated with a card removal.
321 */
322
323/* NOTE: send_event needs to be called with skt->sem held. */
324
325static int send_event(struct pcmcia_socket *s, event_t event, int priority)
326{
327	int ret;
328
329	if (s->state & SOCKET_CARDBUS)
330		return 0;
331
332	cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
333	   event, priority, s->callback);
334
335	if (!s->callback)
336		return 0;
337	if (!try_module_get(s->callback->owner))
338		return 0;
339
340	ret = s->callback->event(s, event, priority);
341
342	module_put(s->callback->owner);
343
344	return ret;
345}
346
347static void socket_remove_drivers(struct pcmcia_socket *skt)
348{
349	cs_dbg(skt, 4, "remove_drivers\n");
350
351	send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
352}
353
354static int socket_reset(struct pcmcia_socket *skt)
355{
356	int status, i;
357
358	cs_dbg(skt, 4, "reset\n");
359
360	skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
361	skt->ops->set_socket(skt, &skt->socket);
362	udelay((long)reset_time);
363
364	skt->socket.flags &= ~SS_RESET;
365	skt->ops->set_socket(skt, &skt->socket);
366
367	msleep(unreset_delay * 10);
368	for (i = 0; i < unreset_limit; i++) {
369		skt->ops->get_status(skt, &status);
370
371		if (!(status & SS_DETECT))
372			return CS_NO_CARD;
373
374		if (status & SS_READY)
375			return CS_SUCCESS;
376
377		msleep(unreset_check * 10);
378	}
379
380	cs_err(skt, "time out after reset.\n");
381	return CS_GENERAL_FAILURE;
382}
383
384/**
385 * socket_setup() and socket_shutdown() are called by the main event handler
386 * when card insertion and removal events are received.
387 * socket_setup() turns on socket power and resets the socket, in two stages.
388 * socket_shutdown() unconfigures a socket and turns off socket power.
389 */
390static void socket_shutdown(struct pcmcia_socket *s)
391{
392	int status;
393
394	cs_dbg(s, 4, "shutdown\n");
395
396	socket_remove_drivers(s);
397	s->state &= SOCKET_INUSE | SOCKET_PRESENT;
398	msleep(shutdown_delay * 10);
399	s->state &= SOCKET_INUSE;
400
401	/* Blank out the socket state */
402	s->socket = dead_socket;
403	s->ops->init(s);
404	s->ops->set_socket(s, &s->socket);
405	s->irq.AssignedIRQ = s->irq.Config = 0;
406	s->lock_count = 0;
407	destroy_cis_cache(s);
408#ifdef CONFIG_CARDBUS
409	cb_free(s);
410#endif
411	s->functions = 0;
412
413	s->ops->get_status(s, &status);
414	if (status & SS_POWERON) {
415		printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
416	}
417
418	cs_socket_put(s);
419}
420
421static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
422{
423	int status, i;
424
425	cs_dbg(skt, 4, "setup\n");
426
427	skt->ops->get_status(skt, &status);
428	if (!(status & SS_DETECT))
429		return CS_NO_CARD;
430
431	msleep(initial_delay * 10);
432
433	for (i = 0; i < 100; i++) {
434		skt->ops->get_status(skt, &status);
435		if (!(status & SS_DETECT))
436			return CS_NO_CARD;
437
438		if (!(status & SS_PENDING))
439			break;
440
441		msleep(100);
442	}
443
444	if (status & SS_PENDING) {
445		cs_err(skt, "voltage interrogation timed out.\n");
446		return CS_GENERAL_FAILURE;
447	}
448
449	if (status & SS_CARDBUS) {
450		if (!(skt->features & SS_CAP_CARDBUS)) {
451			cs_err(skt, "cardbus cards are not supported.\n");
452			return CS_BAD_TYPE;
453		}
454		skt->state |= SOCKET_CARDBUS;
455	}
456
457	/*
458	 * Decode the card voltage requirements, and apply power to the card.
459	 */
460	if (status & SS_3VCARD)
461		skt->socket.Vcc = skt->socket.Vpp = 33;
462	else if (!(status & SS_XVCARD))
463		skt->socket.Vcc = skt->socket.Vpp = 50;
464	else {
465		cs_err(skt, "unsupported voltage key.\n");
466		return CS_BAD_TYPE;
467	}
468
469	if (skt->power_hook)
470		skt->power_hook(skt, HOOK_POWER_PRE);
471
472	skt->socket.flags = 0;
473	skt->ops->set_socket(skt, &skt->socket);
474
475	/*
476	 * Wait "vcc_settle" for the supply to stabilise.
477	 */
478	msleep(vcc_settle * 10);
479
480	skt->ops->get_status(skt, &status);
481	if (!(status & SS_POWERON)) {
482		cs_err(skt, "unable to apply power.\n");
483		return CS_BAD_TYPE;
484	}
485
486	status = socket_reset(skt);
487
488	if (skt->power_hook)
489		skt->power_hook(skt, HOOK_POWER_POST);
490
491	return status;
492}
493
494/*
495 * Handle card insertion.  Setup the socket, reset the card,
496 * and then tell the rest of PCMCIA that a card is present.
497 */
498static int socket_insert(struct pcmcia_socket *skt)
499{
500	int ret;
501
502	cs_dbg(skt, 4, "insert\n");
503
504	if (!cs_socket_get(skt))
505		return CS_NO_CARD;
506
507	ret = socket_setup(skt, setup_delay);
508	if (ret == CS_SUCCESS) {
509		skt->state |= SOCKET_PRESENT;
510
511		printk(KERN_NOTICE "pccard: %s card inserted into slot %d\n",
512		       (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
513		       skt->sock);
514
515#ifdef CONFIG_CARDBUS
516		if (skt->state & SOCKET_CARDBUS) {
517			cb_alloc(skt);
518			skt->state |= SOCKET_CARDBUS_CONFIG;
519		}
520#endif
521		cs_dbg(skt, 4, "insert done\n");
522
523		send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
524	} else {
525		socket_shutdown(skt);
526	}
527
528	return ret;
529}
530
531static int socket_suspend(struct pcmcia_socket *skt)
532{
533	if (skt->state & SOCKET_SUSPEND)
534		return CS_IN_USE;
535
536	send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
537	skt->socket = dead_socket;
538	skt->ops->set_socket(skt, &skt->socket);
539	if (skt->ops->suspend)
540		skt->ops->suspend(skt);
541	skt->state |= SOCKET_SUSPEND;
542
543	return CS_SUCCESS;
544}
545
546/*
547 * Resume a socket.  If a card is present, verify its CIS against
548 * our cached copy.  If they are different, the card has been
549 * replaced, and we need to tell the drivers.
550 */
551static int socket_resume(struct pcmcia_socket *skt)
552{
553	int ret;
554
555	if (!(skt->state & SOCKET_SUSPEND))
556		return CS_IN_USE;
557
558	skt->socket = dead_socket;
559	skt->ops->init(skt);
560	skt->ops->set_socket(skt, &skt->socket);
561
562	if (!(skt->state & SOCKET_PRESENT)) {
563		skt->state &= ~SOCKET_SUSPEND;
564		return socket_insert(skt);
565	}
566
567	ret = socket_setup(skt, resume_delay);
568	if (ret == CS_SUCCESS) {
569		/*
570		 * FIXME: need a better check here for cardbus cards.
571		 */
572		if (verify_cis_cache(skt) != 0) {
573			cs_dbg(skt, 4, "cis mismatch - different card\n");
574			socket_remove_drivers(skt);
575			destroy_cis_cache(skt);
576			/*
577			 * Workaround: give DS time to schedule removal.
578			 * Remove me once the 100ms delay is eliminated
579			 * in ds.c
580			 */
581			msleep(200);
582			send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
583		} else {
584			cs_dbg(skt, 4, "cis matches cache\n");
585			send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
586		}
587	} else {
588		socket_shutdown(skt);
589	}
590
591	skt->state &= ~SOCKET_SUSPEND;
592
593	return CS_SUCCESS;
594}
595
596static void socket_remove(struct pcmcia_socket *skt)
597{
598	printk(KERN_NOTICE "pccard: card ejected from slot %d\n", skt->sock);
599	socket_shutdown(skt);
600}
601
602/*
603 * Process a socket card detect status change.
604 *
605 * If we don't have a card already present, delay the detect event for
606 * about 20ms (to be on the safe side) before reading the socket status.
607 *
608 * Some i82365-based systems send multiple SS_DETECT events during card
609 * insertion, and the "card present" status bit seems to bounce.  This
610 * will probably be true with GPIO-based card detection systems after
611 * the product has aged.
612 */
613static void socket_detect_change(struct pcmcia_socket *skt)
614{
615	if (!(skt->state & SOCKET_SUSPEND)) {
616		int status;
617
618		if (!(skt->state & SOCKET_PRESENT))
619			msleep(20);
620
621		skt->ops->get_status(skt, &status);
622		if ((skt->state & SOCKET_PRESENT) &&
623		     !(status & SS_DETECT))
624			socket_remove(skt);
625		if (!(skt->state & SOCKET_PRESENT) &&
626		    (status & SS_DETECT))
627			socket_insert(skt);
628	}
629}
630
631static int pccardd(void *__skt)
632{
633	struct pcmcia_socket *skt = __skt;
634	DECLARE_WAITQUEUE(wait, current);
635	int ret;
636
637	skt->thread = current;
638	skt->socket = dead_socket;
639	skt->ops->init(skt);
640	skt->ops->set_socket(skt, &skt->socket);
641
642	/* register with the device core */
643	ret = device_register(&skt->dev);
644	if (ret) {
645		printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
646			skt);
647		skt->thread = NULL;
648		complete(&skt->thread_done);
649		return 0;
650	}
651
652	add_wait_queue(&skt->thread_wait, &wait);
653	complete(&skt->thread_done);
654
655	for (;;) {
656		unsigned long flags;
657		unsigned int events;
658
659		set_current_state(TASK_INTERRUPTIBLE);
660
661		spin_lock_irqsave(&skt->thread_lock, flags);
662		events = skt->thread_events;
663		skt->thread_events = 0;
664		spin_unlock_irqrestore(&skt->thread_lock, flags);
665
666		if (events) {
667			mutex_lock(&skt->skt_mutex);
668			if (events & SS_DETECT)
669				socket_detect_change(skt);
670			if (events & SS_BATDEAD)
671				send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
672			if (events & SS_BATWARN)
673				send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
674			if (events & SS_READY)
675				send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
676			mutex_unlock(&skt->skt_mutex);
677			continue;
678		}
679
680		if (kthread_should_stop())
681			break;
682
683		schedule();
684		try_to_freeze();
685	}
686	/* make sure we are running before we exit */
687	set_current_state(TASK_RUNNING);
688
689	remove_wait_queue(&skt->thread_wait, &wait);
690
691	/* remove from the device core */
692	device_unregister(&skt->dev);
693
694	return 0;
695}
696
697/*
698 * Yenta (at least) probes interrupts before registering the socket and
699 * starting the handler thread.
700 */
701void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
702{
703	unsigned long flags;
704	cs_dbg(s, 4, "parse_events: events %08x\n", events);
705	if (s->thread) {
706		spin_lock_irqsave(&s->thread_lock, flags);
707		s->thread_events |= events;
708		spin_unlock_irqrestore(&s->thread_lock, flags);
709
710		wake_up(&s->thread_wait);
711	}
712} /* pcmcia_parse_events */
713EXPORT_SYMBOL(pcmcia_parse_events);
714
715
716/* register pcmcia_callback */
717int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
718{
719        int ret = 0;
720
721	/* s->skt_mutex also protects s->callback */
722	mutex_lock(&s->skt_mutex);
723
724	if (c) {
725		/* registration */
726		if (s->callback) {
727			ret = -EBUSY;
728			goto err;
729		}
730
731		s->callback = c;
732
733		if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
734			send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
735	} else
736		s->callback = NULL;
737 err:
738	mutex_unlock(&s->skt_mutex);
739
740	return ret;
741}
742EXPORT_SYMBOL(pccard_register_pcmcia);
743
744
745/* I'm not sure which "reset" function this is supposed to use,
746 * but for now, it uses the low-level interface's reset, not the
747 * CIS register.
748 */
749
750int pccard_reset_card(struct pcmcia_socket *skt)
751{
752	int ret;
753
754	cs_dbg(skt, 1, "resetting socket\n");
755
756	mutex_lock(&skt->skt_mutex);
757	do {
758		if (!(skt->state & SOCKET_PRESENT)) {
759			ret = CS_NO_CARD;
760			break;
761		}
762		if (skt->state & SOCKET_SUSPEND) {
763			ret = CS_IN_USE;
764			break;
765		}
766		if (skt->state & SOCKET_CARDBUS) {
767			ret = CS_UNSUPPORTED_FUNCTION;
768			break;
769		}
770
771		ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
772		if (ret == 0) {
773			send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
774			if (skt->callback)
775				skt->callback->suspend(skt);
776			if (socket_reset(skt) == CS_SUCCESS) {
777				send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
778				if (skt->callback)
779					skt->callback->resume(skt);
780			}
781		}
782
783		ret = CS_SUCCESS;
784	} while (0);
785	mutex_unlock(&skt->skt_mutex);
786
787	return ret;
788} /* reset_card */
789EXPORT_SYMBOL(pccard_reset_card);
790
791
792/* These shut down or wake up a socket.  They are sort of user
793 * initiated versions of the APM suspend and resume actions.
794 */
795int pcmcia_suspend_card(struct pcmcia_socket *skt)
796{
797	int ret;
798
799	cs_dbg(skt, 1, "suspending socket\n");
800
801	mutex_lock(&skt->skt_mutex);
802	do {
803		if (!(skt->state & SOCKET_PRESENT)) {
804			ret = CS_NO_CARD;
805			break;
806		}
807		if (skt->state & SOCKET_CARDBUS) {
808			ret = CS_UNSUPPORTED_FUNCTION;
809			break;
810		}
811		if (skt->callback) {
812			ret = skt->callback->suspend(skt);
813			if (ret)
814				break;
815		}
816		ret = socket_suspend(skt);
817	} while (0);
818	mutex_unlock(&skt->skt_mutex);
819
820	return ret;
821} /* suspend_card */
822EXPORT_SYMBOL(pcmcia_suspend_card);
823
824
825int pcmcia_resume_card(struct pcmcia_socket *skt)
826{
827	int ret;
828    
829	cs_dbg(skt, 1, "waking up socket\n");
830
831	mutex_lock(&skt->skt_mutex);
832	do {
833		if (!(skt->state & SOCKET_PRESENT)) {
834			ret = CS_NO_CARD;
835			break;
836		}
837		if (skt->state & SOCKET_CARDBUS) {
838			ret = CS_UNSUPPORTED_FUNCTION;
839			break;
840		}
841		ret = socket_resume(skt);
842		if (!ret && skt->callback)
843			skt->callback->resume(skt);
844	} while (0);
845	mutex_unlock(&skt->skt_mutex);
846
847	return ret;
848} /* resume_card */
849EXPORT_SYMBOL(pcmcia_resume_card);
850
851
852/* These handle user requests to eject or insert a card. */
853int pcmcia_eject_card(struct pcmcia_socket *skt)
854{
855	int ret;
856    
857	cs_dbg(skt, 1, "user eject request\n");
858
859	mutex_lock(&skt->skt_mutex);
860	do {
861		if (!(skt->state & SOCKET_PRESENT)) {
862			ret = -ENODEV;
863			break;
864		}
865
866		ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
867		if (ret != 0) {
868			ret = -EINVAL;
869			break;
870		}
871
872		socket_remove(skt);
873		ret = 0;
874	} while (0);
875	mutex_unlock(&skt->skt_mutex);
876
877	return ret;
878} /* eject_card */
879EXPORT_SYMBOL(pcmcia_eject_card);
880
881
882int pcmcia_insert_card(struct pcmcia_socket *skt)
883{
884	int ret;
885
886	cs_dbg(skt, 1, "user insert request\n");
887
888	mutex_lock(&skt->skt_mutex);
889	do {
890		if (skt->state & SOCKET_PRESENT) {
891			ret = -EBUSY;
892			break;
893		}
894		if (socket_insert(skt) == CS_NO_CARD) {
895			ret = -ENODEV;
896			break;
897		}
898		ret = 0;
899	} while (0);
900	mutex_unlock(&skt->skt_mutex);
901
902	return ret;
903} /* insert_card */
904EXPORT_SYMBOL(pcmcia_insert_card);
905
906
907static int pcmcia_socket_uevent(struct device *dev, char **envp,
908			        int num_envp, char *buffer, int buffer_size)
909{
910	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
911	int i = 0, length = 0;
912
913	if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
914			   &length, "SOCKET_NO=%u", s->sock))
915		return -ENOMEM;
916
917	envp[i] = NULL;
918
919	return 0;
920}
921
922
923static struct completion pcmcia_unload;
924
925static void pcmcia_release_socket_class(struct class *data)
926{
927	complete(&pcmcia_unload);
928}
929
930
931struct class pcmcia_socket_class = {
932	.name = "pcmcia_socket",
933	.dev_uevent = pcmcia_socket_uevent,
934	.dev_release = pcmcia_release_socket,
935	.class_release = pcmcia_release_socket_class,
936};
937EXPORT_SYMBOL(pcmcia_socket_class);
938
939
940static int __init init_pcmcia_cs(void)
941{
942	int ret;
943
944	init_completion(&pcmcia_unload);
945	ret = class_register(&pcmcia_socket_class);
946	if (ret)
947		return (ret);
948	return class_interface_register(&pccard_sysfs_interface);
949}
950
951static void __exit exit_pcmcia_cs(void)
952{
953	class_interface_unregister(&pccard_sysfs_interface);
954	class_unregister(&pcmcia_socket_class);
955
956	wait_for_completion(&pcmcia_unload);
957}
958
959subsys_initcall(init_pcmcia_cs);
960module_exit(exit_pcmcia_cs);
961