xref: /openbmc/linux/drivers/pcmcia/cs.c (revision 0b402094) 
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/system.h>
33 #include <asm/irq.h>
34 
35 #define IN_CARD_SERVICES
36 #include <pcmcia/cs_types.h>
37 #include <pcmcia/ss.h>
38 #include <pcmcia/cs.h>
39 #include <pcmcia/bulkmem.h>
40 #include <pcmcia/cistpl.h>
41 #include <pcmcia/cisreg.h>
42 #include <pcmcia/ds.h>
43 #include "cs_internal.h"
44 
45 
46 /* Module parameters */
47 
48 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
49 MODULE_DESCRIPTION("Linux Kernel Card Services");
50 MODULE_LICENSE("GPL");
51 
52 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
53 
54 INT_MODULE_PARM(setup_delay,	10);		/* centiseconds */
55 INT_MODULE_PARM(resume_delay,	20);		/* centiseconds */
56 INT_MODULE_PARM(shutdown_delay,	3);		/* centiseconds */
57 INT_MODULE_PARM(vcc_settle,	40);		/* centiseconds */
58 INT_MODULE_PARM(reset_time,	10);		/* usecs */
59 INT_MODULE_PARM(unreset_delay,	10);		/* centiseconds */
60 INT_MODULE_PARM(unreset_check,	10);		/* centiseconds */
61 INT_MODULE_PARM(unreset_limit,	30);		/* unreset_check's */
62 
63 /* Access speed for attribute memory windows */
64 INT_MODULE_PARM(cis_speed,	300);		/* ns */
65 
66 #ifdef DEBUG
67 static int pc_debug;
68 
69 module_param(pc_debug, int, 0644);
70 
71 int cs_debug_level(int level)
72 {
73 	return pc_debug > level;
74 }
75 #endif
76 
77 
78 socket_state_t dead_socket = {
79 	.csc_mask	= SS_DETECT,
80 };
81 EXPORT_SYMBOL(dead_socket);
82 
83 
84 /* List of all sockets, protected by a rwsem */
85 LIST_HEAD(pcmcia_socket_list);
86 EXPORT_SYMBOL(pcmcia_socket_list);
87 
88 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
89 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
90 
91 
92 /*
93  * Low-level PCMCIA socket drivers need to register with the PCCard
94  * core using pcmcia_register_socket.
95  *
96  * socket drivers are expected to use the following callbacks in their
97  * .drv struct:
98  *  - pcmcia_socket_dev_suspend
99  *  - pcmcia_socket_dev_resume
100  * These functions check for the appropriate struct pcmcia_soket arrays,
101  * and pass them to the low-level functions pcmcia_{suspend,resume}_socket
102  */
103 static int socket_resume(struct pcmcia_socket *skt);
104 static int socket_suspend(struct pcmcia_socket *skt);
105 
106 int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
107 {
108 	struct pcmcia_socket *socket;
109 
110 	down_read(&pcmcia_socket_list_rwsem);
111 	list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
112 		if (socket->dev.parent != dev)
113 			continue;
114 		mutex_lock(&socket->skt_mutex);
115 		socket_suspend(socket);
116 		mutex_unlock(&socket->skt_mutex);
117 	}
118 	up_read(&pcmcia_socket_list_rwsem);
119 
120 	return 0;
121 }
122 EXPORT_SYMBOL(pcmcia_socket_dev_suspend);
123 
124 int pcmcia_socket_dev_resume(struct device *dev)
125 {
126 	struct pcmcia_socket *socket;
127 
128 	down_read(&pcmcia_socket_list_rwsem);
129 	list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
130 		if (socket->dev.parent != dev)
131 			continue;
132 		mutex_lock(&socket->skt_mutex);
133 		socket_resume(socket);
134 		mutex_unlock(&socket->skt_mutex);
135 	}
136 	up_read(&pcmcia_socket_list_rwsem);
137 
138 	return 0;
139 }
140 EXPORT_SYMBOL(pcmcia_socket_dev_resume);
141 
142 
143 struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt)
144 {
145 	struct device *dev = get_device(&skt->dev);
146 	if (!dev)
147 		return NULL;
148 	skt = dev_get_drvdata(dev);
149 	if (!try_module_get(skt->owner)) {
150 		put_device(&skt->dev);
151 		return NULL;
152 	}
153 	return (skt);
154 }
155 EXPORT_SYMBOL(pcmcia_get_socket);
156 
157 
158 void pcmcia_put_socket(struct pcmcia_socket *skt)
159 {
160 	module_put(skt->owner);
161 	put_device(&skt->dev);
162 }
163 EXPORT_SYMBOL(pcmcia_put_socket);
164 
165 
166 static void pcmcia_release_socket(struct device *dev)
167 {
168 	struct pcmcia_socket *socket = dev_get_drvdata(dev);
169 
170 	complete(&socket->socket_released);
171 }
172 
173 static int pccardd(void *__skt);
174 
175 /**
176  * pcmcia_register_socket - add a new pcmcia socket device
177  * @socket: the &socket to register
178  */
179 int 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 	mutex_init(&socket->skt_mutex);
242 	spin_lock_init(&socket->thread_lock);
243 
244 	tsk = kthread_run(pccardd, socket, "pccardd");
245 	if (IS_ERR(tsk)) {
246 		ret = PTR_ERR(tsk);
247 		goto err;
248 	}
249 
250 	wait_for_completion(&socket->thread_done);
251 	if (!socket->thread) {
252 		printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket);
253 		return -EIO;
254 	}
255 
256 	pcmcia_parse_events(socket, SS_DETECT);
257 
258 	return 0;
259 
260  err:
261 	down_write(&pcmcia_socket_list_rwsem);
262 	list_del(&socket->socket_list);
263 	up_write(&pcmcia_socket_list_rwsem);
264 	return ret;
265 } /* pcmcia_register_socket */
266 EXPORT_SYMBOL(pcmcia_register_socket);
267 
268 
269 /**
270  * pcmcia_unregister_socket - remove a pcmcia socket device
271  * @socket: the &socket to unregister
272  */
273 void 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 		kthread_stop(socket->thread);
282 
283 	release_cis_mem(socket);
284 
285 	/* remove from our own list */
286 	down_write(&pcmcia_socket_list_rwsem);
287 	list_del(&socket->socket_list);
288 	up_write(&pcmcia_socket_list_rwsem);
289 
290 	/* wait for sysfs to drop all references */
291 	release_resource_db(socket);
292 	wait_for_completion(&socket->socket_released);
293 } /* pcmcia_unregister_socket */
294 EXPORT_SYMBOL(pcmcia_unregister_socket);
295 
296 
297 struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr)
298 {
299 	struct pcmcia_socket *s;
300 
301 	down_read(&pcmcia_socket_list_rwsem);
302 	list_for_each_entry(s, &pcmcia_socket_list, socket_list)
303 		if (s->sock == nr) {
304 			up_read(&pcmcia_socket_list_rwsem);
305 			return s;
306 		}
307 	up_read(&pcmcia_socket_list_rwsem);
308 
309 	return NULL;
310 
311 }
312 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
313 
314 /*
315  * The central event handler.  Send_event() sends an event to the
316  * 16-bit subsystem, which then calls the relevant device drivers.
317  * Parse_events() interprets the event bits from
318  * a card status change report.  Do_shutdown() handles the high
319  * priority stuff associated with a card removal.
320  */
321 
322 /* NOTE: send_event needs to be called with skt->sem held. */
323 
324 static int send_event(struct pcmcia_socket *s, event_t event, int priority)
325 {
326 	int ret;
327 
328 	if (s->state & SOCKET_CARDBUS)
329 		return 0;
330 
331 	cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n",
332 	   event, priority, s->callback);
333 
334 	if (!s->callback)
335 		return 0;
336 	if (!try_module_get(s->callback->owner))
337 		return 0;
338 
339 	ret = s->callback->event(s, event, priority);
340 
341 	module_put(s->callback->owner);
342 
343 	return ret;
344 }
345 
346 static void socket_remove_drivers(struct pcmcia_socket *skt)
347 {
348 	cs_dbg(skt, 4, "remove_drivers\n");
349 
350 	send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH);
351 }
352 
353 static int socket_reset(struct pcmcia_socket *skt)
354 {
355 	int status, i;
356 
357 	cs_dbg(skt, 4, "reset\n");
358 
359 	skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
360 	skt->ops->set_socket(skt, &skt->socket);
361 	udelay((long)reset_time);
362 
363 	skt->socket.flags &= ~SS_RESET;
364 	skt->ops->set_socket(skt, &skt->socket);
365 
366 	msleep(unreset_delay * 10);
367 	for (i = 0; i < unreset_limit; i++) {
368 		skt->ops->get_status(skt, &status);
369 
370 		if (!(status & SS_DETECT))
371 			return CS_NO_CARD;
372 
373 		if (status & SS_READY)
374 			return CS_SUCCESS;
375 
376 		msleep(unreset_check * 10);
377 	}
378 
379 	cs_err(skt, "time out after reset.\n");
380 	return CS_GENERAL_FAILURE;
381 }
382 
383 /*
384  * socket_setup() and socket_shutdown() are called by the main event handler
385  * when card insertion and removal events are received.
386  * socket_setup() turns on socket power and resets the socket, in two stages.
387  * socket_shutdown() unconfigures a socket and turns off socket power.
388  */
389 static void socket_shutdown(struct pcmcia_socket *s)
390 {
391 	int status;
392 
393 	cs_dbg(s, 4, "shutdown\n");
394 
395 	socket_remove_drivers(s);
396 	s->state &= SOCKET_INUSE | SOCKET_PRESENT;
397 	msleep(shutdown_delay * 10);
398 	s->state &= SOCKET_INUSE;
399 
400 	/* Blank out the socket state */
401 	s->socket = dead_socket;
402 	s->ops->init(s);
403 	s->ops->set_socket(s, &s->socket);
404 	s->irq.AssignedIRQ = s->irq.Config = 0;
405 	s->lock_count = 0;
406 	destroy_cis_cache(s);
407 #ifdef CONFIG_CARDBUS
408 	cb_free(s);
409 #endif
410 	s->functions = 0;
411 
412 	/* give socket some time to power down */
413 	msleep(100);
414 
415 	s->ops->get_status(s, &status);
416 	if (status & SS_POWERON) {
417 		printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s);
418 	}
419 
420 	cs_socket_put(s);
421 }
422 
423 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
424 {
425 	int status, i;
426 
427 	cs_dbg(skt, 4, "setup\n");
428 
429 	skt->ops->get_status(skt, &status);
430 	if (!(status & SS_DETECT))
431 		return CS_NO_CARD;
432 
433 	msleep(initial_delay * 10);
434 
435 	for (i = 0; i < 100; i++) {
436 		skt->ops->get_status(skt, &status);
437 		if (!(status & SS_DETECT))
438 			return CS_NO_CARD;
439 
440 		if (!(status & SS_PENDING))
441 			break;
442 
443 		msleep(100);
444 	}
445 
446 	if (status & SS_PENDING) {
447 		cs_err(skt, "voltage interrogation timed out.\n");
448 		return CS_GENERAL_FAILURE;
449 	}
450 
451 	if (status & SS_CARDBUS) {
452 		if (!(skt->features & SS_CAP_CARDBUS)) {
453 			cs_err(skt, "cardbus cards are not supported.\n");
454 			return CS_BAD_TYPE;
455 		}
456 		skt->state |= SOCKET_CARDBUS;
457 	}
458 
459 	/*
460 	 * Decode the card voltage requirements, and apply power to the card.
461 	 */
462 	if (status & SS_3VCARD)
463 		skt->socket.Vcc = skt->socket.Vpp = 33;
464 	else if (!(status & SS_XVCARD))
465 		skt->socket.Vcc = skt->socket.Vpp = 50;
466 	else {
467 		cs_err(skt, "unsupported voltage key.\n");
468 		return CS_BAD_TYPE;
469 	}
470 
471 	if (skt->power_hook)
472 		skt->power_hook(skt, HOOK_POWER_PRE);
473 
474 	skt->socket.flags = 0;
475 	skt->ops->set_socket(skt, &skt->socket);
476 
477 	/*
478 	 * Wait "vcc_settle" for the supply to stabilise.
479 	 */
480 	msleep(vcc_settle * 10);
481 
482 	skt->ops->get_status(skt, &status);
483 	if (!(status & SS_POWERON)) {
484 		cs_err(skt, "unable to apply power.\n");
485 		return CS_BAD_TYPE;
486 	}
487 
488 	status = socket_reset(skt);
489 
490 	if (skt->power_hook)
491 		skt->power_hook(skt, HOOK_POWER_POST);
492 
493 	return status;
494 }
495 
496 /*
497  * Handle card insertion.  Setup the socket, reset the card,
498  * and then tell the rest of PCMCIA that a card is present.
499  */
500 static int socket_insert(struct pcmcia_socket *skt)
501 {
502 	int ret;
503 
504 	cs_dbg(skt, 4, "insert\n");
505 
506 	if (!cs_socket_get(skt))
507 		return CS_NO_CARD;
508 
509 	ret = socket_setup(skt, setup_delay);
510 	if (ret == CS_SUCCESS) {
511 		skt->state |= SOCKET_PRESENT;
512 
513 		printk(KERN_NOTICE "pccard: %s card inserted into slot %d\n",
514 		       (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
515 		       skt->sock);
516 
517 #ifdef CONFIG_CARDBUS
518 		if (skt->state & SOCKET_CARDBUS) {
519 			cb_alloc(skt);
520 			skt->state |= SOCKET_CARDBUS_CONFIG;
521 		}
522 #endif
523 		cs_dbg(skt, 4, "insert done\n");
524 
525 		send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
526 	} else {
527 		socket_shutdown(skt);
528 	}
529 
530 	return ret;
531 }
532 
533 static int socket_suspend(struct pcmcia_socket *skt)
534 {
535 	if (skt->state & SOCKET_SUSPEND)
536 		return CS_IN_USE;
537 
538 	send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW);
539 	skt->socket = dead_socket;
540 	skt->ops->set_socket(skt, &skt->socket);
541 	if (skt->ops->suspend)
542 		skt->ops->suspend(skt);
543 	skt->state |= SOCKET_SUSPEND;
544 
545 	return CS_SUCCESS;
546 }
547 
548 /*
549  * Resume a socket.  If a card is present, verify its CIS against
550  * our cached copy.  If they are different, the card has been
551  * replaced, and we need to tell the drivers.
552  */
553 static int socket_resume(struct pcmcia_socket *skt)
554 {
555 	int ret;
556 
557 	if (!(skt->state & SOCKET_SUSPEND))
558 		return CS_IN_USE;
559 
560 	skt->socket = dead_socket;
561 	skt->ops->init(skt);
562 	skt->ops->set_socket(skt, &skt->socket);
563 
564 	if (!(skt->state & SOCKET_PRESENT)) {
565 		skt->state &= ~SOCKET_SUSPEND;
566 		return socket_insert(skt);
567 	}
568 
569 	ret = socket_setup(skt, resume_delay);
570 	if (ret == CS_SUCCESS) {
571 		/*
572 		 * FIXME: need a better check here for cardbus cards.
573 		 */
574 		if (verify_cis_cache(skt) != 0) {
575 			cs_dbg(skt, 4, "cis mismatch - different card\n");
576 			socket_remove_drivers(skt);
577 			destroy_cis_cache(skt);
578 			/*
579 			 * Workaround: give DS time to schedule removal.
580 			 * Remove me once the 100ms delay is eliminated
581 			 * in ds.c
582 			 */
583 			msleep(200);
584 			send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
585 		} else {
586 			cs_dbg(skt, 4, "cis matches cache\n");
587 			send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW);
588 		}
589 	} else {
590 		socket_shutdown(skt);
591 	}
592 
593 	skt->state &= ~SOCKET_SUSPEND;
594 
595 	return CS_SUCCESS;
596 }
597 
598 static void socket_remove(struct pcmcia_socket *skt)
599 {
600 	printk(KERN_NOTICE "pccard: card ejected from slot %d\n", skt->sock);
601 	socket_shutdown(skt);
602 }
603 
604 /*
605  * Process a socket card detect status change.
606  *
607  * If we don't have a card already present, delay the detect event for
608  * about 20ms (to be on the safe side) before reading the socket status.
609  *
610  * Some i82365-based systems send multiple SS_DETECT events during card
611  * insertion, and the "card present" status bit seems to bounce.  This
612  * will probably be true with GPIO-based card detection systems after
613  * the product has aged.
614  */
615 static void socket_detect_change(struct pcmcia_socket *skt)
616 {
617 	if (!(skt->state & SOCKET_SUSPEND)) {
618 		int status;
619 
620 		if (!(skt->state & SOCKET_PRESENT))
621 			msleep(20);
622 
623 		skt->ops->get_status(skt, &status);
624 		if ((skt->state & SOCKET_PRESENT) &&
625 		     !(status & SS_DETECT))
626 			socket_remove(skt);
627 		if (!(skt->state & SOCKET_PRESENT) &&
628 		    (status & SS_DETECT))
629 			socket_insert(skt);
630 	}
631 }
632 
633 static int pccardd(void *__skt)
634 {
635 	struct pcmcia_socket *skt = __skt;
636 	int ret;
637 
638 	skt->thread = current;
639 	skt->socket = dead_socket;
640 	skt->ops->init(skt);
641 	skt->ops->set_socket(skt, &skt->socket);
642 
643 	/* register with the device core */
644 	ret = device_register(&skt->dev);
645 	if (ret) {
646 		printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n",
647 			skt);
648 		skt->thread = NULL;
649 		complete(&skt->thread_done);
650 		return 0;
651 	}
652 	ret = pccard_sysfs_add_socket(&skt->dev);
653 	if (ret)
654 		dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
655 
656 	complete(&skt->thread_done);
657 
658 	set_freezable();
659 	for (;;) {
660 		unsigned long flags;
661 		unsigned int events;
662 
663 		set_current_state(TASK_INTERRUPTIBLE);
664 
665 		spin_lock_irqsave(&skt->thread_lock, flags);
666 		events = skt->thread_events;
667 		skt->thread_events = 0;
668 		spin_unlock_irqrestore(&skt->thread_lock, flags);
669 
670 		if (events) {
671 			mutex_lock(&skt->skt_mutex);
672 			if (events & SS_DETECT)
673 				socket_detect_change(skt);
674 			if (events & SS_BATDEAD)
675 				send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW);
676 			if (events & SS_BATWARN)
677 				send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
678 			if (events & SS_READY)
679 				send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
680 			mutex_unlock(&skt->skt_mutex);
681 			continue;
682 		}
683 
684 		if (kthread_should_stop())
685 			break;
686 
687 		schedule();
688 		try_to_freeze();
689 	}
690 	/* make sure we are running before we exit */
691 	set_current_state(TASK_RUNNING);
692 
693 	/* remove from the device core */
694 	pccard_sysfs_remove_socket(&skt->dev);
695 	device_unregister(&skt->dev);
696 
697 	return 0;
698 }
699 
700 /*
701  * Yenta (at least) probes interrupts before registering the socket and
702  * starting the handler thread.
703  */
704 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
705 {
706 	unsigned long flags;
707 	cs_dbg(s, 4, "parse_events: events %08x\n", events);
708 	if (s->thread) {
709 		spin_lock_irqsave(&s->thread_lock, flags);
710 		s->thread_events |= events;
711 		spin_unlock_irqrestore(&s->thread_lock, flags);
712 
713 		wake_up_process(s->thread);
714 	}
715 } /* pcmcia_parse_events */
716 EXPORT_SYMBOL(pcmcia_parse_events);
717 
718 
719 /* register pcmcia_callback */
720 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
721 {
722         int ret = 0;
723 
724 	/* s->skt_mutex also protects s->callback */
725 	mutex_lock(&s->skt_mutex);
726 
727 	if (c) {
728 		/* registration */
729 		if (s->callback) {
730 			ret = -EBUSY;
731 			goto err;
732 		}
733 
734 		s->callback = c;
735 
736 		if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
737 			send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW);
738 	} else
739 		s->callback = NULL;
740  err:
741 	mutex_unlock(&s->skt_mutex);
742 
743 	return ret;
744 }
745 EXPORT_SYMBOL(pccard_register_pcmcia);
746 
747 
748 /* I'm not sure which "reset" function this is supposed to use,
749  * but for now, it uses the low-level interface's reset, not the
750  * CIS register.
751  */
752 
753 int pccard_reset_card(struct pcmcia_socket *skt)
754 {
755 	int ret;
756 
757 	cs_dbg(skt, 1, "resetting socket\n");
758 
759 	mutex_lock(&skt->skt_mutex);
760 	do {
761 		if (!(skt->state & SOCKET_PRESENT)) {
762 			ret = CS_NO_CARD;
763 			break;
764 		}
765 		if (skt->state & SOCKET_SUSPEND) {
766 			ret = CS_IN_USE;
767 			break;
768 		}
769 		if (skt->state & SOCKET_CARDBUS) {
770 			ret = CS_UNSUPPORTED_FUNCTION;
771 			break;
772 		}
773 
774 		ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW);
775 		if (ret == 0) {
776 			send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW);
777 			if (skt->callback)
778 				skt->callback->suspend(skt);
779 			if (socket_reset(skt) == CS_SUCCESS) {
780 				send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW);
781 				if (skt->callback)
782 					skt->callback->resume(skt);
783 			}
784 		}
785 
786 		ret = CS_SUCCESS;
787 	} while (0);
788 	mutex_unlock(&skt->skt_mutex);
789 
790 	return ret;
791 } /* reset_card */
792 EXPORT_SYMBOL(pccard_reset_card);
793 
794 
795 /* These shut down or wake up a socket.  They are sort of user
796  * initiated versions of the APM suspend and resume actions.
797  */
798 int pcmcia_suspend_card(struct pcmcia_socket *skt)
799 {
800 	int ret;
801 
802 	cs_dbg(skt, 1, "suspending socket\n");
803 
804 	mutex_lock(&skt->skt_mutex);
805 	do {
806 		if (!(skt->state & SOCKET_PRESENT)) {
807 			ret = CS_NO_CARD;
808 			break;
809 		}
810 		if (skt->state & SOCKET_CARDBUS) {
811 			ret = CS_UNSUPPORTED_FUNCTION;
812 			break;
813 		}
814 		if (skt->callback) {
815 			ret = skt->callback->suspend(skt);
816 			if (ret)
817 				break;
818 		}
819 		ret = socket_suspend(skt);
820 	} while (0);
821 	mutex_unlock(&skt->skt_mutex);
822 
823 	return ret;
824 } /* suspend_card */
825 EXPORT_SYMBOL(pcmcia_suspend_card);
826 
827 
828 int pcmcia_resume_card(struct pcmcia_socket *skt)
829 {
830 	int ret;
831 
832 	cs_dbg(skt, 1, "waking up socket\n");
833 
834 	mutex_lock(&skt->skt_mutex);
835 	do {
836 		if (!(skt->state & SOCKET_PRESENT)) {
837 			ret = CS_NO_CARD;
838 			break;
839 		}
840 		if (skt->state & SOCKET_CARDBUS) {
841 			ret = CS_UNSUPPORTED_FUNCTION;
842 			break;
843 		}
844 		ret = socket_resume(skt);
845 		if (!ret && skt->callback)
846 			skt->callback->resume(skt);
847 	} while (0);
848 	mutex_unlock(&skt->skt_mutex);
849 
850 	return ret;
851 } /* resume_card */
852 EXPORT_SYMBOL(pcmcia_resume_card);
853 
854 
855 /* These handle user requests to eject or insert a card. */
856 int pcmcia_eject_card(struct pcmcia_socket *skt)
857 {
858 	int ret;
859 
860 	cs_dbg(skt, 1, "user eject request\n");
861 
862 	mutex_lock(&skt->skt_mutex);
863 	do {
864 		if (!(skt->state & SOCKET_PRESENT)) {
865 			ret = -ENODEV;
866 			break;
867 		}
868 
869 		ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW);
870 		if (ret != 0) {
871 			ret = -EINVAL;
872 			break;
873 		}
874 
875 		socket_remove(skt);
876 		ret = 0;
877 	} while (0);
878 	mutex_unlock(&skt->skt_mutex);
879 
880 	return ret;
881 } /* eject_card */
882 EXPORT_SYMBOL(pcmcia_eject_card);
883 
884 
885 int pcmcia_insert_card(struct pcmcia_socket *skt)
886 {
887 	int ret;
888 
889 	cs_dbg(skt, 1, "user insert request\n");
890 
891 	mutex_lock(&skt->skt_mutex);
892 	do {
893 		if (skt->state & SOCKET_PRESENT) {
894 			ret = -EBUSY;
895 			break;
896 		}
897 		if (socket_insert(skt) == CS_NO_CARD) {
898 			ret = -ENODEV;
899 			break;
900 		}
901 		ret = 0;
902 	} while (0);
903 	mutex_unlock(&skt->skt_mutex);
904 
905 	return ret;
906 } /* insert_card */
907 EXPORT_SYMBOL(pcmcia_insert_card);
908 
909 
910 static int pcmcia_socket_uevent(struct device *dev,
911 				struct kobj_uevent_env *env)
912 {
913 	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
914 
915 	if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
916 		return -ENOMEM;
917 
918 	return 0;
919 }
920 
921 
922 static struct completion pcmcia_unload;
923 
924 static void pcmcia_release_socket_class(struct class *data)
925 {
926 	complete(&pcmcia_unload);
927 }
928 
929 
930 struct class pcmcia_socket_class = {
931 	.name = "pcmcia_socket",
932 	.dev_uevent = pcmcia_socket_uevent,
933 	.dev_release = pcmcia_release_socket,
934 	.class_release = pcmcia_release_socket_class,
935 };
936 EXPORT_SYMBOL(pcmcia_socket_class);
937 
938 
939 static int __init init_pcmcia_cs(void)
940 {
941 	init_completion(&pcmcia_unload);
942 	return class_register(&pcmcia_socket_class);
943 }
944 
945 static void __exit exit_pcmcia_cs(void)
946 {
947 	class_unregister(&pcmcia_socket_class);
948 	wait_for_completion(&pcmcia_unload);
949 }
950 
951 subsys_initcall(init_pcmcia_cs);
952 module_exit(exit_pcmcia_cs);
953 
954