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 skt = dev_get_drvdata(dev);
144 if (!try_module_get(skt->owner)) {
145 put_device(&skt->dev);
150 EXPORT_SYMBOL(pcmcia_get_socket);
153 void pcmcia_put_socket(struct pcmcia_socket *skt)
155 module_put(skt->owner);
156 put_device(&skt->dev);
158 EXPORT_SYMBOL(pcmcia_put_socket);
161 static void pcmcia_release_socket(struct device *dev)
163 struct pcmcia_socket *socket = dev_get_drvdata(dev);
165 complete(&socket->socket_released);
168 static int pccardd(void *__skt);
171 * pcmcia_register_socket - add a new pcmcia socket device
172 * @socket: the &socket to register
174 int pcmcia_register_socket(struct pcmcia_socket *socket)
176 struct task_struct *tsk;
179 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
182 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
184 spin_lock_init(&socket->lock);
186 /* try to obtain a socket number [yes, it gets ugly if we
187 * register more than 2^sizeof(unsigned int) pcmcia
188 * sockets... but the socket number is deprecated
189 * anyways, so I don't care] */
190 down_write(&pcmcia_socket_list_rwsem);
191 if (list_empty(&pcmcia_socket_list))
194 unsigned int found, i = 1;
195 struct pcmcia_socket *tmp;
198 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
204 socket->sock = i - 1;
206 list_add_tail(&socket->socket_list, &pcmcia_socket_list);
207 up_write(&pcmcia_socket_list_rwsem);
209 #ifndef CONFIG_CARDBUS
211 * If we do not support Cardbus, ensure that
212 * the Cardbus socket capability is disabled.
214 socket->features &= ~SS_CAP_CARDBUS;
217 /* set proper values in socket->dev */
218 dev_set_drvdata(&socket->dev, socket);
219 socket->dev.class = &pcmcia_socket_class;
220 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
222 /* base address = 0, map = 0 */
223 socket->cis_mem.flags = 0;
224 socket->cis_mem.speed = cis_speed;
226 INIT_LIST_HEAD(&socket->cis_cache);
228 init_completion(&socket->socket_released);
229 init_completion(&socket->thread_done);
230 mutex_init(&socket->skt_mutex);
231 spin_lock_init(&socket->thread_lock);
233 if (socket->resource_ops->init) {
234 ret = socket->resource_ops->init(socket);
239 tsk = kthread_run(pccardd, socket, "pccardd");
245 wait_for_completion(&socket->thread_done);
246 if (!socket->thread) {
247 dev_printk(KERN_WARNING, &socket->dev,
248 "PCMCIA: warning: socket thread did not start\n");
252 pcmcia_parse_events(socket, SS_DETECT);
255 * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
256 * If it fails, it doesn't matter -- we still have 32-bit CardBus
257 * support to offer, so this is not a failure mode.
259 request_module_nowait("pcmcia");
264 down_write(&pcmcia_socket_list_rwsem);
265 list_del(&socket->socket_list);
266 up_write(&pcmcia_socket_list_rwsem);
268 } /* pcmcia_register_socket */
269 EXPORT_SYMBOL(pcmcia_register_socket);
273 * pcmcia_unregister_socket - remove a pcmcia socket device
274 * @socket: the &socket to unregister
276 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
281 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
284 kthread_stop(socket->thread);
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);
291 /* wait for sysfs to drop all references */
292 release_resource_db(socket);
293 wait_for_completion(&socket->socket_released);
294 } /* pcmcia_unregister_socket */
295 EXPORT_SYMBOL(pcmcia_unregister_socket);
298 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
300 struct pcmcia_socket *s;
302 down_read(&pcmcia_socket_list_rwsem);
303 list_for_each_entry(s, &pcmcia_socket_list, socket_list)
305 up_read(&pcmcia_socket_list_rwsem);
308 up_read(&pcmcia_socket_list_rwsem);
313 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
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.
323 /* NOTE: send_event needs to be called with skt->sem held. */
325 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
329 if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL))
332 dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n",
333 event, priority, s->callback);
337 if (!try_module_get(s->callback->owner))
340 ret = s->callback->event(s, event, priority);
342 module_put(s->callback->owner);
347 static int socket_reset(struct pcmcia_socket *skt)
351 dev_dbg(&skt->dev, "reset\n");
353 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
354 skt->ops->set_socket(skt, &skt->socket);
355 udelay((long)reset_time);
357 skt->socket.flags &= ~SS_RESET;
358 skt->ops->set_socket(skt, &skt->socket);
360 msleep(unreset_delay * 10);
361 for (i = 0; i < unreset_limit; i++) {
362 skt->ops->get_status(skt, &status);
364 if (!(status & SS_DETECT))
367 if (status & SS_READY)
370 msleep(unreset_check * 10);
373 dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n");
378 * socket_setup() and socket_shutdown() are called by the main event handler
379 * when card insertion and removal events are received.
380 * socket_setup() turns on socket power and resets the socket, in two stages.
381 * socket_shutdown() unconfigures a socket and turns off socket power.
383 static void socket_shutdown(struct pcmcia_socket *s)
387 dev_dbg(&s->dev, "shutdown\n");
389 send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
390 s->state &= SOCKET_INUSE | SOCKET_PRESENT;
391 msleep(shutdown_delay * 10);
392 s->state &= SOCKET_INUSE;
394 /* Blank out the socket state */
395 s->socket = dead_socket;
397 s->ops->set_socket(s, &s->socket);
398 s->irq.AssignedIRQ = s->irq.Config = 0;
402 #ifdef CONFIG_CARDBUS
407 /* give socket some time to power down */
410 s->ops->get_status(s, &status);
411 if (status & SS_POWERON) {
412 dev_printk(KERN_ERR, &s->dev,
413 "*** DANGER *** unable to remove socket power\n");
419 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
423 dev_dbg(&skt->dev, "setup\n");
425 skt->ops->get_status(skt, &status);
426 if (!(status & SS_DETECT))
429 msleep(initial_delay * 10);
431 for (i = 0; i < 100; i++) {
432 skt->ops->get_status(skt, &status);
433 if (!(status & SS_DETECT))
436 if (!(status & SS_PENDING))
442 if (status & SS_PENDING) {
443 dev_printk(KERN_ERR, &skt->dev,
444 "voltage interrogation timed out.\n");
448 if (status & SS_CARDBUS) {
449 if (!(skt->features & SS_CAP_CARDBUS)) {
450 dev_printk(KERN_ERR, &skt->dev,
451 "cardbus cards are not supported.\n");
454 skt->state |= SOCKET_CARDBUS;
456 skt->state &= ~SOCKET_CARDBUS;
459 * Decode the card voltage requirements, and apply power to the card.
461 if (status & SS_3VCARD)
462 skt->socket.Vcc = skt->socket.Vpp = 33;
463 else if (!(status & SS_XVCARD))
464 skt->socket.Vcc = skt->socket.Vpp = 50;
466 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n");
471 skt->power_hook(skt, HOOK_POWER_PRE);
473 skt->socket.flags = 0;
474 skt->ops->set_socket(skt, &skt->socket);
477 * Wait "vcc_settle" for the supply to stabilise.
479 msleep(vcc_settle * 10);
481 skt->ops->get_status(skt, &status);
482 if (!(status & SS_POWERON)) {
483 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n");
487 status = socket_reset(skt);
490 skt->power_hook(skt, HOOK_POWER_POST);
496 * Handle card insertion. Setup the socket, reset the card,
497 * and then tell the rest of PCMCIA that a card is present.
499 static int socket_insert(struct pcmcia_socket *skt)
503 dev_dbg(&skt->dev, "insert\n");
505 if (!cs_socket_get(skt))
508 ret = socket_setup(skt, setup_delay);
510 skt->state |= SOCKET_PRESENT;
512 dev_printk(KERN_NOTICE, &skt->dev,
513 "pccard: %s card inserted into slot %d\n",
514 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
517 #ifdef CONFIG_CARDBUS
518 if (skt->state & SOCKET_CARDBUS) {
520 skt->state |= SOCKET_CARDBUS_CONFIG;
523 dev_dbg(&skt->dev, "insert done\n");
525 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
527 socket_shutdown(skt);
533 static int socket_suspend(struct pcmcia_socket *skt)
535 if (skt->state & SOCKET_SUSPEND)
538 skt->suspended_state = skt->state;
540 send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
541 skt->socket = dead_socket;
542 skt->ops->set_socket(skt, &skt->socket);
543 if (skt->ops->suspend)
544 skt->ops->suspend(skt);
545 skt->state |= SOCKET_SUSPEND;
550 static int socket_early_resume(struct pcmcia_socket *skt)
552 skt->socket = dead_socket;
554 skt->ops->set_socket(skt, &skt->socket);
555 if (skt->state & SOCKET_PRESENT)
556 skt->resume_status = socket_setup(skt, resume_delay);
560 static int socket_late_resume(struct pcmcia_socket *skt)
562 skt->state &= ~SOCKET_SUSPEND;
564 if (!(skt->state & SOCKET_PRESENT))
565 return socket_insert(skt);
567 if (skt->resume_status) {
568 socket_shutdown(skt);
572 if (skt->suspended_state != skt->state) {
574 "suspend state 0x%x != resume state 0x%x\n",
575 skt->suspended_state, skt->state);
577 socket_shutdown(skt);
578 return socket_insert(skt);
581 #ifdef CONFIG_CARDBUS
582 if (skt->state & SOCKET_CARDBUS) {
583 /* We can't be sure the CardBus card is the same
584 * as the one previously inserted. Therefore, remove
592 send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
597 * Resume a socket. If a card is present, verify its CIS against
598 * our cached copy. If they are different, the card has been
599 * replaced, and we need to tell the drivers.
601 static int socket_resume(struct pcmcia_socket *skt)
603 if (!(skt->state & SOCKET_SUSPEND))
606 socket_early_resume(skt);
607 return socket_late_resume(skt);
610 static void socket_remove(struct pcmcia_socket *skt)
612 dev_printk(KERN_NOTICE, &skt->dev,
613 "pccard: card ejected from slot %d\n", skt->sock);
614 socket_shutdown(skt);
618 * Process a socket card detect status change.
620 * If we don't have a card already present, delay the detect event for
621 * about 20ms (to be on the safe side) before reading the socket status.
623 * Some i82365-based systems send multiple SS_DETECT events during card
624 * insertion, and the "card present" status bit seems to bounce. This
625 * will probably be true with GPIO-based card detection systems after
626 * the product has aged.
628 static void socket_detect_change(struct pcmcia_socket *skt)
630 if (!(skt->state & SOCKET_SUSPEND)) {
633 if (!(skt->state & SOCKET_PRESENT))
636 skt->ops->get_status(skt, &status);
637 if ((skt->state & SOCKET_PRESENT) &&
638 !(status & SS_DETECT))
640 if (!(skt->state & SOCKET_PRESENT) &&
641 (status & SS_DETECT))
646 static int pccardd(void *__skt)
648 struct pcmcia_socket *skt = __skt;
651 skt->thread = current;
652 skt->socket = dead_socket;
654 skt->ops->set_socket(skt, &skt->socket);
656 /* register with the device core */
657 ret = device_register(&skt->dev);
659 dev_printk(KERN_WARNING, &skt->dev,
660 "PCMCIA: unable to register socket\n");
662 complete(&skt->thread_done);
665 ret = pccard_sysfs_add_socket(&skt->dev);
667 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
669 complete(&skt->thread_done);
676 set_current_state(TASK_INTERRUPTIBLE);
678 spin_lock_irqsave(&skt->thread_lock, flags);
679 events = skt->thread_events;
680 skt->thread_events = 0;
681 spin_unlock_irqrestore(&skt->thread_lock, flags);
684 mutex_lock(&skt->skt_mutex);
685 if (events & SS_DETECT)
686 socket_detect_change(skt);
687 if (events & SS_BATDEAD)
688 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
689 if (events & SS_BATWARN)
690 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
691 if (events & SS_READY)
692 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
693 mutex_unlock(&skt->skt_mutex);
697 if (kthread_should_stop())
703 /* make sure we are running before we exit */
704 set_current_state(TASK_RUNNING);
706 /* remove from the device core */
707 pccard_sysfs_remove_socket(&skt->dev);
708 device_unregister(&skt->dev);
714 * Yenta (at least) probes interrupts before registering the socket and
715 * starting the handler thread.
717 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
720 dev_dbg(&s->dev, "parse_events: events %08x\n", events);
722 spin_lock_irqsave(&s->thread_lock, flags);
723 s->thread_events |= events;
724 spin_unlock_irqrestore(&s->thread_lock, flags);
726 wake_up_process(s->thread);
728 } /* pcmcia_parse_events */
729 EXPORT_SYMBOL(pcmcia_parse_events);
732 /* register pcmcia_callback */
733 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
737 /* s->skt_mutex also protects s->callback */
738 mutex_lock(&s->skt_mutex);
749 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
750 send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
754 mutex_unlock(&s->skt_mutex);
758 EXPORT_SYMBOL(pccard_register_pcmcia);
761 /* I'm not sure which "reset" function this is supposed to use,
762 * but for now, it uses the low-level interface's reset, not the
766 int pcmcia_reset_card(struct pcmcia_socket *skt)
770 dev_dbg(&skt->dev, "resetting socket\n");
772 mutex_lock(&skt->skt_mutex);
774 if (!(skt->state & SOCKET_PRESENT)) {
775 dev_dbg(&skt->dev, "can't reset, not present\n");
779 if (skt->state & SOCKET_SUSPEND) {
780 dev_dbg(&skt->dev, "can't reset, suspended\n");
784 if (skt->state & SOCKET_CARDBUS) {
785 dev_dbg(&skt->dev, "can't reset, is cardbus\n");
790 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
792 send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
794 skt->callback->suspend(skt);
795 if (socket_reset(skt) == 0) {
796 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
798 skt->callback->resume(skt);
804 mutex_unlock(&skt->skt_mutex);
808 EXPORT_SYMBOL(pcmcia_reset_card);
811 /* These shut down or wake up a socket. They are sort of user
812 * initiated versions of the APM suspend and resume actions.
814 int pcmcia_suspend_card(struct pcmcia_socket *skt)
818 dev_dbg(&skt->dev, "suspending socket\n");
820 mutex_lock(&skt->skt_mutex);
822 if (!(skt->state & SOCKET_PRESENT)) {
826 if (skt->state & SOCKET_CARDBUS) {
831 ret = skt->callback->suspend(skt);
835 ret = socket_suspend(skt);
837 mutex_unlock(&skt->skt_mutex);
841 EXPORT_SYMBOL(pcmcia_suspend_card);
844 int pcmcia_resume_card(struct pcmcia_socket *skt)
848 dev_dbg(&skt->dev, "waking up socket\n");
850 mutex_lock(&skt->skt_mutex);
852 if (!(skt->state & SOCKET_PRESENT)) {
856 if (skt->state & SOCKET_CARDBUS) {
860 ret = socket_resume(skt);
861 if (!ret && skt->callback)
862 skt->callback->resume(skt);
864 mutex_unlock(&skt->skt_mutex);
868 EXPORT_SYMBOL(pcmcia_resume_card);
871 /* These handle user requests to eject or insert a card. */
872 int pcmcia_eject_card(struct pcmcia_socket *skt)
876 dev_dbg(&skt->dev, "user eject request\n");
878 mutex_lock(&skt->skt_mutex);
880 if (!(skt->state & SOCKET_PRESENT)) {
885 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
894 mutex_unlock(&skt->skt_mutex);
898 EXPORT_SYMBOL(pcmcia_eject_card);
901 int pcmcia_insert_card(struct pcmcia_socket *skt)
905 dev_dbg(&skt->dev, "user insert request\n");
907 mutex_lock(&skt->skt_mutex);
909 if (skt->state & SOCKET_PRESENT) {
913 if (socket_insert(skt) == -ENODEV) {
919 mutex_unlock(&skt->skt_mutex);
923 EXPORT_SYMBOL(pcmcia_insert_card);
926 static int pcmcia_socket_uevent(struct device *dev,
927 struct kobj_uevent_env *env)
929 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
931 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
938 static struct completion pcmcia_unload;
940 static void pcmcia_release_socket_class(struct class *data)
942 complete(&pcmcia_unload);
946 struct class pcmcia_socket_class = {
947 .name = "pcmcia_socket",
948 .dev_uevent = pcmcia_socket_uevent,
949 .dev_release = pcmcia_release_socket,
950 .class_release = pcmcia_release_socket_class,
952 EXPORT_SYMBOL(pcmcia_socket_class);
955 static int __init init_pcmcia_cs(void)
957 init_completion(&pcmcia_unload);
958 return class_register(&pcmcia_socket_class);
961 static void __exit exit_pcmcia_cs(void)
963 class_unregister(&pcmcia_socket_class);
964 wait_for_completion(&pcmcia_unload);
967 subsys_initcall(init_pcmcia_cs);
968 module_exit(exit_pcmcia_cs);