2 * cs.c -- Kernel Card Services - core services
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.
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.
12 * (C) 1999 David A. Hinds
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>
24 #include <linux/interrupt.h>
25 #include <linux/timer.h>
26 #include <linux/ioport.h>
27 #include <linux/delay.h>
29 #include <linux/device.h>
30 #include <linux/kthread.h>
31 #include <linux/freezer.h>
32 #include <asm/system.h>
35 #include <pcmcia/cs_types.h>
36 #include <pcmcia/ss.h>
37 #include <pcmcia/cs.h>
38 #include <pcmcia/cistpl.h>
39 #include <pcmcia/cisreg.h>
40 #include <pcmcia/ds.h>
41 #include "cs_internal.h"
44 /* Module parameters */
46 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
47 MODULE_DESCRIPTION("Linux Kernel Card Services");
48 MODULE_LICENSE("GPL");
50 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
52 INT_MODULE_PARM(setup_delay, 10); /* centiseconds */
53 INT_MODULE_PARM(resume_delay, 20); /* centiseconds */
54 INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */
55 INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */
56 INT_MODULE_PARM(reset_time, 10); /* usecs */
57 INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */
58 INT_MODULE_PARM(unreset_check, 10); /* centiseconds */
59 INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */
61 /* Access speed for attribute memory windows */
62 INT_MODULE_PARM(cis_speed, 300); /* ns */
65 socket_state_t dead_socket = {
66 .csc_mask = SS_DETECT,
68 EXPORT_SYMBOL(dead_socket);
71 /* List of all sockets, protected by a rwsem */
72 LIST_HEAD(pcmcia_socket_list);
73 EXPORT_SYMBOL(pcmcia_socket_list);
75 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
76 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
80 * Low-level PCMCIA socket drivers need to register with the PCCard
81 * core using pcmcia_register_socket.
83 * socket drivers are expected to use the following callbacks in their
85 * - pcmcia_socket_dev_suspend
86 * - pcmcia_socket_dev_resume
87 * These functions check for the appropriate struct pcmcia_soket arrays,
88 * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
90 static int socket_early_resume(struct pcmcia_socket *skt);
91 static int socket_late_resume(struct pcmcia_socket *skt);
92 static int socket_resume(struct pcmcia_socket *skt);
93 static int socket_suspend(struct pcmcia_socket *skt);
95 static void pcmcia_socket_dev_run(struct device *dev,
96 int (*cb)(struct pcmcia_socket *))
98 struct pcmcia_socket *socket;
100 down_read(&pcmcia_socket_list_rwsem);
101 list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
102 if (socket->dev.parent != dev)
104 mutex_lock(&socket->skt_mutex);
106 mutex_unlock(&socket->skt_mutex);
108 up_read(&pcmcia_socket_list_rwsem);
111 int pcmcia_socket_dev_suspend(struct device *dev)
113 pcmcia_socket_dev_run(dev, socket_suspend);
116 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
118 void pcmcia_socket_dev_early_resume(struct device *dev)
120 pcmcia_socket_dev_run(dev, socket_early_resume);
122 EXPORT_SYMBOL(pcmcia_socket_dev_early_resume);
124 void pcmcia_socket_dev_late_resume(struct device *dev)
126 pcmcia_socket_dev_run(dev, socket_late_resume);
128 EXPORT_SYMBOL(pcmcia_socket_dev_late_resume);
130 int pcmcia_socket_dev_resume(struct device *dev)
132 pcmcia_socket_dev_run(dev, socket_resume);
135 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
138 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
140 struct device *dev = get_device(&skt->dev);
143 return dev_get_drvdata(dev);
145 EXPORT_SYMBOL(pcmcia_get_socket);
148 void pcmcia_put_socket(struct pcmcia_socket *skt)
150 put_device(&skt->dev);
152 EXPORT_SYMBOL(pcmcia_put_socket);
155 static void pcmcia_release_socket(struct device *dev)
157 struct pcmcia_socket *socket = dev_get_drvdata(dev);
159 complete(&socket->socket_released);
162 static int pccardd(void *__skt);
165 * pcmcia_register_socket - add a new pcmcia socket device
166 * @socket: the &socket to register
168 int pcmcia_register_socket(struct pcmcia_socket *socket)
170 struct task_struct *tsk;
173 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
176 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
178 spin_lock_init(&socket->lock);
180 /* try to obtain a socket number [yes, it gets ugly if we
181 * register more than 2^sizeof(unsigned int) pcmcia
182 * sockets... but the socket number is deprecated
183 * anyways, so I don't care] */
184 down_write(&pcmcia_socket_list_rwsem);
185 if (list_empty(&pcmcia_socket_list))
188 unsigned int found, i = 1;
189 struct pcmcia_socket *tmp;
192 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
198 socket->sock = i - 1;
200 list_add_tail(&socket->socket_list, &pcmcia_socket_list);
201 up_write(&pcmcia_socket_list_rwsem);
203 #ifndef CONFIG_CARDBUS
205 * If we do not support Cardbus, ensure that
206 * the Cardbus socket capability is disabled.
208 socket->features &= ~SS_CAP_CARDBUS;
211 /* set proper values in socket->dev */
212 dev_set_drvdata(&socket->dev, socket);
213 socket->dev.class = &pcmcia_socket_class;
214 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
216 /* base address = 0, map = 0 */
217 socket->cis_mem.flags = 0;
218 socket->cis_mem.speed = cis_speed;
220 INIT_LIST_HEAD(&socket->cis_cache);
222 init_completion(&socket->socket_released);
223 init_completion(&socket->thread_done);
224 mutex_init(&socket->skt_mutex);
225 spin_lock_init(&socket->thread_lock);
227 if (socket->resource_ops->init) {
228 ret = socket->resource_ops->init(socket);
233 tsk = kthread_run(pccardd, socket, "pccardd");
239 wait_for_completion(&socket->thread_done);
240 if (!socket->thread) {
241 dev_printk(KERN_WARNING, &socket->dev,
242 "PCMCIA: warning: socket thread did not start\n");
246 pcmcia_parse_events(socket, SS_DETECT);
249 * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
250 * If it fails, it doesn't matter -- we still have 32-bit CardBus
251 * support to offer, so this is not a failure mode.
253 request_module_nowait("pcmcia");
258 down_write(&pcmcia_socket_list_rwsem);
259 list_del(&socket->socket_list);
260 up_write(&pcmcia_socket_list_rwsem);
262 } /* pcmcia_register_socket */
263 EXPORT_SYMBOL(pcmcia_register_socket);
267 * pcmcia_unregister_socket - remove a pcmcia socket device
268 * @socket: the &socket to unregister
270 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
275 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
278 kthread_stop(socket->thread);
280 /* remove from our own list */
281 down_write(&pcmcia_socket_list_rwsem);
282 list_del(&socket->socket_list);
283 up_write(&pcmcia_socket_list_rwsem);
285 /* wait for sysfs to drop all references */
286 release_resource_db(socket);
287 wait_for_completion(&socket->socket_released);
288 } /* pcmcia_unregister_socket */
289 EXPORT_SYMBOL(pcmcia_unregister_socket);
292 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
294 struct pcmcia_socket *s;
296 down_read(&pcmcia_socket_list_rwsem);
297 list_for_each_entry(s, &pcmcia_socket_list, socket_list)
299 up_read(&pcmcia_socket_list_rwsem);
302 up_read(&pcmcia_socket_list_rwsem);
307 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
310 * The central event handler. Send_event() sends an event to the
311 * 16-bit subsystem, which then calls the relevant device drivers.
312 * Parse_events() interprets the event bits from
313 * a card status change report. Do_shutdown() handles the high
314 * priority stuff associated with a card removal.
317 /* NOTE: send_event needs to be called with skt->sem held. */
319 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
323 if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
326 dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
327 event, priority, s->callback);
331 if (!try_module_get(s->callback->owner))
334 ret = s->callback->event(s, event, priority);
336 module_put(s->callback->owner);
341 static int socket_reset(struct pcmcia_socket *skt)
345 dev_dbg(&skt->dev, "reset\n");
347 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
348 skt->ops->set_socket(skt, &skt->socket);
349 udelay((long)reset_time);
351 skt->socket.flags &= ~SS_RESET;
352 skt->ops->set_socket(skt, &skt->socket);
354 msleep(unreset_delay * 10);
355 for (i = 0; i < unreset_limit; i++) {
356 skt->ops->get_status(skt, &status);
358 if (!(status & SS_DETECT))
361 if (status & SS_READY)
364 msleep(unreset_check * 10);
367 dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
372 * socket_setup() and socket_shutdown() are called by the main event handler
373 * when card insertion and removal events are received.
374 * socket_setup() turns on socket power and resets the socket, in two stages.
375 * socket_shutdown() unconfigures a socket and turns off socket power.
377 static void socket_shutdown(struct pcmcia_socket *s)
381 dev_dbg(&s->dev, "shutdown\n");
383 send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
384 s->state &= SOCKET_INUSE | SOCKET_PRESENT;
385 msleep(shutdown_delay * 10);
386 s->state &= SOCKET_INUSE;
388 /* Blank out the socket state */
389 s->socket = dead_socket;
391 s->ops->set_socket(s, &s->socket);
392 s->irq.AssignedIRQ = s->irq.Config = 0;
396 #ifdef CONFIG_CARDBUS
401 /* give socket some time to power down */
404 s->ops->get_status(s, &status);
405 if (status & SS_POWERON) {
406 dev_printk(KERN_ERR, &s->dev,
407 "*** DANGER *** unable to remove socket power\n");
413 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
417 dev_dbg(&skt->dev, "setup\n");
419 skt->ops->get_status(skt, &status);
420 if (!(status & SS_DETECT))
423 msleep(initial_delay * 10);
425 for (i = 0; i < 100; i++) {
426 skt->ops->get_status(skt, &status);
427 if (!(status & SS_DETECT))
430 if (!(status & SS_PENDING))
436 if (status & SS_PENDING) {
437 dev_printk(KERN_ERR, &skt->dev,
438 "voltage interrogation timed out.\n");
442 if (status & SS_CARDBUS) {
443 if (!(skt->features & SS_CAP_CARDBUS)) {
444 dev_printk(KERN_ERR, &skt->dev,
445 "cardbus cards are not supported.\n");
448 skt->state |= SOCKET_CARDBUS;
450 skt->state &= ~SOCKET_CARDBUS;
453 * Decode the card voltage requirements, and apply power to the card.
455 if (status & SS_3VCARD)
456 skt->socket.Vcc = skt->socket.Vpp = 33;
457 else if (!(status & SS_XVCARD))
458 skt->socket.Vcc = skt->socket.Vpp = 50;
460 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
465 skt->power_hook(skt, HOOK_POWER_PRE);
467 skt->socket.flags = 0;
468 skt->ops->set_socket(skt, &skt->socket);
471 * Wait "vcc_settle" for the supply to stabilise.
473 msleep(vcc_settle * 10);
475 skt->ops->get_status(skt, &status);
476 if (!(status & SS_POWERON)) {
477 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
481 status = socket_reset(skt);
484 skt->power_hook(skt, HOOK_POWER_POST);
490 * Handle card insertion. Setup the socket, reset the card,
491 * and then tell the rest of PCMCIA that a card is present.
493 static int socket_insert(struct pcmcia_socket *skt)
497 dev_dbg(&skt->dev, "insert\n");
499 if (!cs_socket_get(skt))
502 ret = socket_setup(skt, setup_delay);
504 skt->state |= SOCKET_PRESENT;
506 dev_printk(KERN_NOTICE, &skt->dev,
507 "pccard: %s card inserted into slot %d\n",
508 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
511 #ifdef CONFIG_CARDBUS
512 if (skt->state & SOCKET_CARDBUS) {
514 skt->state |= SOCKET_CARDBUS_CONFIG;
517 dev_dbg(&skt->dev, "insert done\n");
519 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
521 socket_shutdown(skt);
527 static int socket_suspend(struct pcmcia_socket *skt)
529 if (skt->state & SOCKET_SUSPEND)
532 skt->suspended_state = skt->state;
534 send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
535 skt->socket = dead_socket;
536 skt->ops->set_socket(skt, &skt->socket);
537 if (skt->ops->suspend)
538 skt->ops->suspend(skt);
539 skt->state |= SOCKET_SUSPEND;
544 static int socket_early_resume(struct pcmcia_socket *skt)
546 skt->socket = dead_socket;
548 skt->ops->set_socket(skt, &skt->socket);
549 if (skt->state & SOCKET_PRESENT)
550 skt->resume_status = socket_setup(skt, resume_delay);
554 static int socket_late_resume(struct pcmcia_socket *skt)
556 skt->state &= ~SOCKET_SUSPEND;
558 if (!(skt->state & SOCKET_PRESENT))
559 return socket_insert(skt);
561 if (skt->resume_status) {
562 socket_shutdown(skt);
566 if (skt->suspended_state != skt->state) {
568 "suspend state 0x%x != resume state 0x%x\n",
569 skt->suspended_state, skt->state);
571 socket_shutdown(skt);
572 return socket_insert(skt);
575 #ifdef CONFIG_CARDBUS
576 if (skt->state & SOCKET_CARDBUS) {
577 /* We can't be sure the CardBus card is the same
578 * as the one previously inserted. Therefore, remove
586 send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
591 * Resume a socket. If a card is present, verify its CIS against
592 * our cached copy. If they are different, the card has been
593 * replaced, and we need to tell the drivers.
595 static int socket_resume(struct pcmcia_socket *skt)
597 if (!(skt->state & SOCKET_SUSPEND))
600 socket_early_resume(skt);
601 return socket_late_resume(skt);
604 static void socket_remove(struct pcmcia_socket *skt)
606 dev_printk(KERN_NOTICE, &skt->dev,
607 "pccard: card ejected from slot %d\n", skt->sock);
608 socket_shutdown(skt);
612 * Process a socket card detect status change.
614 * If we don't have a card already present, delay the detect event for
615 * about 20ms (to be on the safe side) before reading the socket status.
617 * Some i82365-based systems send multiple SS_DETECT events during card
618 * insertion, and the "card present" status bit seems to bounce. This
619 * will probably be true with GPIO-based card detection systems after
620 * the product has aged.
622 static void socket_detect_change(struct pcmcia_socket *skt)
624 if (!(skt->state & SOCKET_SUSPEND)) {
627 if (!(skt->state & SOCKET_PRESENT))
630 skt->ops->get_status(skt, &status);
631 if ((skt->state & SOCKET_PRESENT) &&
632 !(status & SS_DETECT))
634 if (!(skt->state & SOCKET_PRESENT) &&
635 (status & SS_DETECT))
640 static int pccardd(void *__skt)
642 struct pcmcia_socket *skt = __skt;
645 skt->thread = current;
646 skt->socket = dead_socket;
648 skt->ops->set_socket(skt, &skt->socket);
650 /* register with the device core */
651 ret = device_register(&skt->dev);
653 dev_printk(KERN_WARNING, &skt->dev,
654 "PCMCIA: unable to register socket\n");
656 complete(&skt->thread_done);
659 ret = pccard_sysfs_add_socket(&skt->dev);
661 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
663 complete(&skt->thread_done);
670 set_current_state(TASK_INTERRUPTIBLE);
672 spin_lock_irqsave(&skt->thread_lock, flags);
673 events = skt->thread_events;
674 skt->thread_events = 0;
675 spin_unlock_irqrestore(&skt->thread_lock, flags);
678 mutex_lock(&skt->skt_mutex);
679 if (events & SS_DETECT)
680 socket_detect_change(skt);
681 if (events & SS_BATDEAD)
682 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
683 if (events & SS_BATWARN)
684 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
685 if (events & SS_READY)
686 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
687 mutex_unlock(&skt->skt_mutex);
691 if (kthread_should_stop())
697 /* make sure we are running before we exit */
698 set_current_state(TASK_RUNNING);
700 /* remove from the device core */
701 pccard_sysfs_remove_socket(&skt->dev);
702 device_unregister(&skt->dev);
708 * Yenta (at least) probes interrupts before registering the socket and
709 * starting the handler thread.
711 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
714 dev_dbg(&s->dev, "parse_events: events %08x\n", events);
716 spin_lock_irqsave(&s->thread_lock, flags);
717 s->thread_events |= events;
718 spin_unlock_irqrestore(&s->thread_lock, flags);
720 wake_up_process(s->thread);
722 } /* pcmcia_parse_events */
723 EXPORT_SYMBOL(pcmcia_parse_events);
726 /* register pcmcia_callback */
727 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
731 /* s->skt_mutex also protects s->callback */
732 mutex_lock(&s->skt_mutex);
743 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
744 send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
748 mutex_unlock(&s->skt_mutex);
752 EXPORT_SYMBOL(pccard_register_pcmcia);
755 /* I'm not sure which "reset" function this is supposed to use,
756 * but for now, it uses the low-level interface's reset, not the
760 int pcmcia_reset_card(struct pcmcia_socket *skt)
764 dev_dbg(&skt->dev, "resetting socket\n");
766 mutex_lock(&skt->skt_mutex);
768 if (!(skt->state & SOCKET_PRESENT)) {
769 dev_dbg(&skt->dev, "can't reset, not present\n");
773 if (skt->state & SOCKET_SUSPEND) {
774 dev_dbg(&skt->dev, "can't reset, suspended\n");
778 if (skt->state & SOCKET_CARDBUS) {
779 dev_dbg(&skt->dev, "can't reset, is cardbus\n");
784 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
786 send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
788 skt->callback->suspend(skt);
789 if (socket_reset(skt) == 0) {
790 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
792 skt->callback->resume(skt);
798 mutex_unlock(&skt->skt_mutex);
802 EXPORT_SYMBOL(pcmcia_reset_card);
805 /* These shut down or wake up a socket. They are sort of user
806 * initiated versions of the APM suspend and resume actions.
808 int pcmcia_suspend_card(struct pcmcia_socket *skt)
812 dev_dbg(&skt->dev, "suspending socket\n");
814 mutex_lock(&skt->skt_mutex);
816 if (!(skt->state & SOCKET_PRESENT)) {
820 if (skt->state & SOCKET_CARDBUS) {
825 ret = skt->callback->suspend(skt);
829 ret = socket_suspend(skt);
831 mutex_unlock(&skt->skt_mutex);
835 EXPORT_SYMBOL(pcmcia_suspend_card);
838 int pcmcia_resume_card(struct pcmcia_socket *skt)
842 dev_dbg(&skt->dev, "waking up socket\n");
844 mutex_lock(&skt->skt_mutex);
846 if (!(skt->state & SOCKET_PRESENT)) {
850 if (skt->state & SOCKET_CARDBUS) {
854 ret = socket_resume(skt);
855 if (!ret && skt->callback)
856 skt->callback->resume(skt);
858 mutex_unlock(&skt->skt_mutex);
862 EXPORT_SYMBOL(pcmcia_resume_card);
865 /* These handle user requests to eject or insert a card. */
866 int pcmcia_eject_card(struct pcmcia_socket *skt)
870 dev_dbg(&skt->dev, "user eject request\n");
872 mutex_lock(&skt->skt_mutex);
874 if (!(skt->state & SOCKET_PRESENT)) {
879 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
888 mutex_unlock(&skt->skt_mutex);
892 EXPORT_SYMBOL(pcmcia_eject_card);
895 int pcmcia_insert_card(struct pcmcia_socket *skt)
899 dev_dbg(&skt->dev, "user insert request\n");
901 mutex_lock(&skt->skt_mutex);
903 if (skt->state & SOCKET_PRESENT) {
907 if (socket_insert(skt) == -ENODEV) {
913 mutex_unlock(&skt->skt_mutex);
917 EXPORT_SYMBOL(pcmcia_insert_card);
920 static int pcmcia_socket_uevent(struct device *dev,
921 struct kobj_uevent_env *env)
923 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
925 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
932 static struct completion pcmcia_unload;
934 static void pcmcia_release_socket_class(struct class *data)
936 complete(&pcmcia_unload);
940 struct class pcmcia_socket_class = {
941 .name = "pcmcia_socket",
942 .dev_uevent = pcmcia_socket_uevent,
943 .dev_release = pcmcia_release_socket,
944 .class_release = pcmcia_release_socket_class,
946 EXPORT_SYMBOL(pcmcia_socket_class);
949 static int __init init_pcmcia_cs(void)
951 init_completion(&pcmcia_unload);
952 return class_register(&pcmcia_socket_class);
955 static void __exit exit_pcmcia_cs(void)
957 class_unregister(&pcmcia_socket_class);
958 wait_for_completion(&pcmcia_unload);
961 subsys_initcall(init_pcmcia_cs);
962 module_exit(exit_pcmcia_cs);