xref: /openbmc/linux/drivers/pcmcia/cs.c (revision 703e7713) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * cs.c -- Kernel Card Services - core services
4  *
5  * The initial developer of the original code is David A. Hinds
6  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
7  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
8  *
9  * (C) 1999		David A. Hinds
10  */
11 
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/major.h>
18 #include <linux/errno.h>
19 #include <linux/slab.h>
20 #include <linux/mm.h>
21 #include <linux/interrupt.h>
22 #include <linux/timer.h>
23 #include <linux/ioport.h>
24 #include <linux/delay.h>
25 #include <linux/pm.h>
26 #include <linux/device.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <asm/irq.h>
30 
31 #include <pcmcia/ss.h>
32 #include <pcmcia/cistpl.h>
33 #include <pcmcia/cisreg.h>
34 #include <pcmcia/ds.h>
35 #include "cs_internal.h"
36 
37 
38 /* Module parameters */
39 
40 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
41 MODULE_DESCRIPTION("Linux Kernel Card Services");
42 MODULE_LICENSE("GPL");
43 
44 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444)
45 
46 INT_MODULE_PARM(setup_delay,	10);		/* centiseconds */
47 INT_MODULE_PARM(resume_delay,	20);		/* centiseconds */
48 INT_MODULE_PARM(shutdown_delay,	3);		/* centiseconds */
49 INT_MODULE_PARM(vcc_settle,	40);		/* centiseconds */
50 INT_MODULE_PARM(reset_time,	10);		/* usecs */
51 INT_MODULE_PARM(unreset_delay,	10);		/* centiseconds */
52 INT_MODULE_PARM(unreset_check,	10);		/* centiseconds */
53 INT_MODULE_PARM(unreset_limit,	30);		/* unreset_check's */
54 
55 /* Access speed for attribute memory windows */
56 INT_MODULE_PARM(cis_speed,	300);		/* ns */
57 
58 
59 socket_state_t dead_socket = {
60 	.csc_mask	= SS_DETECT,
61 };
62 EXPORT_SYMBOL(dead_socket);
63 
64 
65 /* List of all sockets, protected by a rwsem */
66 LIST_HEAD(pcmcia_socket_list);
67 EXPORT_SYMBOL(pcmcia_socket_list);
68 
69 DECLARE_RWSEM(pcmcia_socket_list_rwsem);
70 EXPORT_SYMBOL(pcmcia_socket_list_rwsem);
71 
72 
73 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt)
74 {
75 	struct device *dev = get_device(&skt->dev);
76 	if (!dev)
77 		return NULL;
78 	return dev_get_drvdata(dev);
79 }
80 EXPORT_SYMBOL(pcmcia_get_socket);
81 
82 
83 void pcmcia_put_socket(struct pcmcia_socket *skt)
84 {
85 	put_device(&skt->dev);
86 }
87 EXPORT_SYMBOL(pcmcia_put_socket);
88 
89 
90 static void pcmcia_release_socket(struct device *dev)
91 {
92 	struct pcmcia_socket *socket = dev_get_drvdata(dev);
93 
94 	complete(&socket->socket_released);
95 }
96 
97 static int pccardd(void *__skt);
98 
99 /**
100  * pcmcia_register_socket - add a new pcmcia socket device
101  * @socket: the &socket to register
102  */
103 int pcmcia_register_socket(struct pcmcia_socket *socket)
104 {
105 	struct task_struct *tsk;
106 	int ret;
107 
108 	if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops)
109 		return -EINVAL;
110 
111 	dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
112 
113 	/* try to obtain a socket number [yes, it gets ugly if we
114 	 * register more than 2^sizeof(unsigned int) pcmcia
115 	 * sockets... but the socket number is deprecated
116 	 * anyways, so I don't care] */
117 	down_write(&pcmcia_socket_list_rwsem);
118 	if (list_empty(&pcmcia_socket_list))
119 		socket->sock = 0;
120 	else {
121 		unsigned int found, i = 1;
122 		struct pcmcia_socket *tmp;
123 		do {
124 			found = 1;
125 			list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) {
126 				if (tmp->sock == i)
127 					found = 0;
128 			}
129 			i++;
130 		} while (!found);
131 		socket->sock = i - 1;
132 	}
133 	list_add_tail(&socket->socket_list, &pcmcia_socket_list);
134 	up_write(&pcmcia_socket_list_rwsem);
135 
136 #ifndef CONFIG_CARDBUS
137 	/*
138 	 * If we do not support Cardbus, ensure that
139 	 * the Cardbus socket capability is disabled.
140 	 */
141 	socket->features &= ~SS_CAP_CARDBUS;
142 #endif
143 
144 	/* set proper values in socket->dev */
145 	dev_set_drvdata(&socket->dev, socket);
146 	socket->dev.class = &pcmcia_socket_class;
147 	dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock);
148 
149 	/* base address = 0, map = 0 */
150 	socket->cis_mem.flags = 0;
151 	socket->cis_mem.speed = cis_speed;
152 
153 	INIT_LIST_HEAD(&socket->cis_cache);
154 
155 	init_completion(&socket->socket_released);
156 	init_completion(&socket->thread_done);
157 	mutex_init(&socket->skt_mutex);
158 	mutex_init(&socket->ops_mutex);
159 	spin_lock_init(&socket->thread_lock);
160 
161 	if (socket->resource_ops->init) {
162 		mutex_lock(&socket->ops_mutex);
163 		ret = socket->resource_ops->init(socket);
164 		mutex_unlock(&socket->ops_mutex);
165 		if (ret)
166 			goto err;
167 	}
168 
169 	tsk = kthread_run(pccardd, socket, "pccardd");
170 	if (IS_ERR(tsk)) {
171 		ret = PTR_ERR(tsk);
172 		goto err;
173 	}
174 
175 	wait_for_completion(&socket->thread_done);
176 	if (!socket->thread) {
177 		dev_warn(&socket->dev,
178 			 "PCMCIA: warning: socket thread did not start\n");
179 		return -EIO;
180 	}
181 
182 	pcmcia_parse_events(socket, SS_DETECT);
183 
184 	/*
185 	 * Let's try to get the PCMCIA module for 16-bit PCMCIA support.
186 	 * If it fails, it doesn't matter -- we still have 32-bit CardBus
187 	 * support to offer, so this is not a failure mode.
188 	 */
189 	request_module_nowait("pcmcia");
190 
191 	return 0;
192 
193  err:
194 	down_write(&pcmcia_socket_list_rwsem);
195 	list_del(&socket->socket_list);
196 	up_write(&pcmcia_socket_list_rwsem);
197 	return ret;
198 } /* pcmcia_register_socket */
199 EXPORT_SYMBOL(pcmcia_register_socket);
200 
201 
202 /**
203  * pcmcia_unregister_socket - remove a pcmcia socket device
204  * @socket: the &socket to unregister
205  */
206 void pcmcia_unregister_socket(struct pcmcia_socket *socket)
207 {
208 	if (!socket)
209 		return;
210 
211 	dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops);
212 
213 	if (socket->thread)
214 		kthread_stop(socket->thread);
215 
216 	/* remove from our own list */
217 	down_write(&pcmcia_socket_list_rwsem);
218 	list_del(&socket->socket_list);
219 	up_write(&pcmcia_socket_list_rwsem);
220 
221 	/* wait for sysfs to drop all references */
222 	if (socket->resource_ops->exit) {
223 		mutex_lock(&socket->ops_mutex);
224 		socket->resource_ops->exit(socket);
225 		mutex_unlock(&socket->ops_mutex);
226 	}
227 	wait_for_completion(&socket->socket_released);
228 } /* pcmcia_unregister_socket */
229 EXPORT_SYMBOL(pcmcia_unregister_socket);
230 
231 
232 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr)
233 {
234 	struct pcmcia_socket *s;
235 
236 	down_read(&pcmcia_socket_list_rwsem);
237 	list_for_each_entry(s, &pcmcia_socket_list, socket_list)
238 		if (s->sock == nr) {
239 			up_read(&pcmcia_socket_list_rwsem);
240 			return s;
241 		}
242 	up_read(&pcmcia_socket_list_rwsem);
243 
244 	return NULL;
245 
246 }
247 EXPORT_SYMBOL(pcmcia_get_socket_by_nr);
248 
249 static int socket_reset(struct pcmcia_socket *skt)
250 {
251 	int status, i;
252 
253 	dev_dbg(&skt->dev, "reset\n");
254 
255 	skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET;
256 	skt->ops->set_socket(skt, &skt->socket);
257 	udelay((long)reset_time);
258 
259 	skt->socket.flags &= ~SS_RESET;
260 	skt->ops->set_socket(skt, &skt->socket);
261 
262 	msleep(unreset_delay * 10);
263 	for (i = 0; i < unreset_limit; i++) {
264 		skt->ops->get_status(skt, &status);
265 
266 		if (!(status & SS_DETECT))
267 			return -ENODEV;
268 
269 		if (status & SS_READY)
270 			return 0;
271 
272 		msleep(unreset_check * 10);
273 	}
274 
275 	dev_err(&skt->dev, "time out after reset\n");
276 	return -ETIMEDOUT;
277 }
278 
279 /*
280  * socket_setup() and socket_shutdown() are called by the main event handler
281  * when card insertion and removal events are received.
282  * socket_setup() turns on socket power and resets the socket, in two stages.
283  * socket_shutdown() unconfigures a socket and turns off socket power.
284  */
285 static void socket_shutdown(struct pcmcia_socket *s)
286 {
287 	int status;
288 
289 	dev_dbg(&s->dev, "shutdown\n");
290 
291 	if (s->callback)
292 		s->callback->remove(s);
293 
294 	mutex_lock(&s->ops_mutex);
295 	s->state &= SOCKET_INUSE | SOCKET_PRESENT;
296 	msleep(shutdown_delay * 10);
297 	s->state &= SOCKET_INUSE;
298 
299 	/* Blank out the socket state */
300 	s->socket = dead_socket;
301 	s->ops->init(s);
302 	s->ops->set_socket(s, &s->socket);
303 	s->lock_count = 0;
304 	kfree(s->fake_cis);
305 	s->fake_cis = NULL;
306 	s->functions = 0;
307 
308 	/* From here on we can be sure that only we (that is, the
309 	 * pccardd thread) accesses this socket, and all (16-bit)
310 	 * PCMCIA interactions are gone. Therefore, release
311 	 * ops_mutex so that we don't get a sysfs-related lockdep
312 	 * warning.
313 	 */
314 	mutex_unlock(&s->ops_mutex);
315 
316 #ifdef CONFIG_CARDBUS
317 	cb_free(s);
318 #endif
319 
320 	/* give socket some time to power down */
321 	msleep(100);
322 
323 	s->ops->get_status(s, &status);
324 	if (status & SS_POWERON) {
325 		dev_err(&s->dev,
326 			"*** DANGER *** unable to remove socket power\n");
327 	}
328 
329 	s->state &= ~SOCKET_INUSE;
330 }
331 
332 static int socket_setup(struct pcmcia_socket *skt, int initial_delay)
333 {
334 	int status, i;
335 
336 	dev_dbg(&skt->dev, "setup\n");
337 
338 	skt->ops->get_status(skt, &status);
339 	if (!(status & SS_DETECT))
340 		return -ENODEV;
341 
342 	msleep(initial_delay * 10);
343 
344 	for (i = 0; i < 100; i++) {
345 		skt->ops->get_status(skt, &status);
346 		if (!(status & SS_DETECT))
347 			return -ENODEV;
348 
349 		if (!(status & SS_PENDING))
350 			break;
351 
352 		msleep(100);
353 	}
354 
355 	if (status & SS_PENDING) {
356 		dev_err(&skt->dev, "voltage interrogation timed out\n");
357 		return -ETIMEDOUT;
358 	}
359 
360 	if (status & SS_CARDBUS) {
361 		if (!(skt->features & SS_CAP_CARDBUS)) {
362 			dev_err(&skt->dev, "cardbus cards are not supported\n");
363 			return -EINVAL;
364 		}
365 		skt->state |= SOCKET_CARDBUS;
366 	} else
367 		skt->state &= ~SOCKET_CARDBUS;
368 
369 	/*
370 	 * Decode the card voltage requirements, and apply power to the card.
371 	 */
372 	if (status & SS_3VCARD)
373 		skt->socket.Vcc = skt->socket.Vpp = 33;
374 	else if (!(status & SS_XVCARD))
375 		skt->socket.Vcc = skt->socket.Vpp = 50;
376 	else {
377 		dev_err(&skt->dev, "unsupported voltage key\n");
378 		return -EIO;
379 	}
380 
381 	if (skt->power_hook)
382 		skt->power_hook(skt, HOOK_POWER_PRE);
383 
384 	skt->socket.flags = 0;
385 	skt->ops->set_socket(skt, &skt->socket);
386 
387 	/*
388 	 * Wait "vcc_settle" for the supply to stabilise.
389 	 */
390 	msleep(vcc_settle * 10);
391 
392 	skt->ops->get_status(skt, &status);
393 	if (!(status & SS_POWERON)) {
394 		dev_err(&skt->dev, "unable to apply power\n");
395 		return -EIO;
396 	}
397 
398 	status = socket_reset(skt);
399 
400 	if (skt->power_hook)
401 		skt->power_hook(skt, HOOK_POWER_POST);
402 
403 	return status;
404 }
405 
406 /*
407  * Handle card insertion.  Setup the socket, reset the card,
408  * and then tell the rest of PCMCIA that a card is present.
409  */
410 static int socket_insert(struct pcmcia_socket *skt)
411 {
412 	int ret;
413 
414 	dev_dbg(&skt->dev, "insert\n");
415 
416 	mutex_lock(&skt->ops_mutex);
417 	if (skt->state & SOCKET_INUSE) {
418 		mutex_unlock(&skt->ops_mutex);
419 		return -EINVAL;
420 	}
421 	skt->state |= SOCKET_INUSE;
422 
423 	ret = socket_setup(skt, setup_delay);
424 	if (ret == 0) {
425 		skt->state |= SOCKET_PRESENT;
426 
427 		dev_notice(&skt->dev, "pccard: %s card inserted into slot %d\n",
428 			   (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA",
429 			   skt->sock);
430 
431 #ifdef CONFIG_CARDBUS
432 		if (skt->state & SOCKET_CARDBUS) {
433 			cb_alloc(skt);
434 			skt->state |= SOCKET_CARDBUS_CONFIG;
435 		}
436 #endif
437 		dev_dbg(&skt->dev, "insert done\n");
438 		mutex_unlock(&skt->ops_mutex);
439 
440 		if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
441 			skt->callback->add(skt);
442 	} else {
443 		mutex_unlock(&skt->ops_mutex);
444 		socket_shutdown(skt);
445 	}
446 
447 	return ret;
448 }
449 
450 static int socket_suspend(struct pcmcia_socket *skt)
451 {
452 	if ((skt->state & SOCKET_SUSPEND) && !(skt->state & SOCKET_IN_RESUME))
453 		return -EBUSY;
454 
455 	mutex_lock(&skt->ops_mutex);
456 	/* store state on first suspend, but not after spurious wakeups */
457 	if (!(skt->state & SOCKET_IN_RESUME))
458 		skt->suspended_state = skt->state;
459 
460 	skt->socket = dead_socket;
461 	skt->ops->set_socket(skt, &skt->socket);
462 	if (skt->ops->suspend)
463 		skt->ops->suspend(skt);
464 	skt->state |= SOCKET_SUSPEND;
465 	skt->state &= ~SOCKET_IN_RESUME;
466 	mutex_unlock(&skt->ops_mutex);
467 	return 0;
468 }
469 
470 static int socket_early_resume(struct pcmcia_socket *skt)
471 {
472 	mutex_lock(&skt->ops_mutex);
473 	skt->socket = dead_socket;
474 	skt->ops->init(skt);
475 	skt->ops->set_socket(skt, &skt->socket);
476 	if (skt->state & SOCKET_PRESENT)
477 		skt->resume_status = socket_setup(skt, resume_delay);
478 	skt->state |= SOCKET_IN_RESUME;
479 	mutex_unlock(&skt->ops_mutex);
480 	return 0;
481 }
482 
483 static int socket_late_resume(struct pcmcia_socket *skt)
484 {
485 	int ret = 0;
486 
487 	mutex_lock(&skt->ops_mutex);
488 	skt->state &= ~(SOCKET_SUSPEND | SOCKET_IN_RESUME);
489 	mutex_unlock(&skt->ops_mutex);
490 
491 	if (!(skt->state & SOCKET_PRESENT)) {
492 		ret = socket_insert(skt);
493 		if (ret == -ENODEV)
494 			ret = 0;
495 		return ret;
496 	}
497 
498 	if (skt->resume_status) {
499 		socket_shutdown(skt);
500 		return 0;
501 	}
502 
503 	if (skt->suspended_state != skt->state) {
504 		dev_dbg(&skt->dev,
505 			"suspend state 0x%x != resume state 0x%x\n",
506 			skt->suspended_state, skt->state);
507 
508 		socket_shutdown(skt);
509 		return socket_insert(skt);
510 	}
511 
512 	if (!(skt->state & SOCKET_CARDBUS) && (skt->callback))
513 		ret = skt->callback->early_resume(skt);
514 	return ret;
515 }
516 
517 /*
518  * Finalize the resume. In case of a cardbus socket, we have
519  * to rebind the devices as we can't be certain that it has been
520  * replaced, or not.
521  */
522 static int socket_complete_resume(struct pcmcia_socket *skt)
523 {
524 	int ret = 0;
525 #ifdef CONFIG_CARDBUS
526 	if (skt->state & SOCKET_CARDBUS) {
527 		/* We can't be sure the CardBus card is the same
528 		 * as the one previously inserted. Therefore, remove
529 		 * and re-add... */
530 		cb_free(skt);
531 		ret = cb_alloc(skt);
532 		if (ret)
533 			cb_free(skt);
534 	}
535 #endif
536 	return ret;
537 }
538 
539 /*
540  * Resume a socket.  If a card is present, verify its CIS against
541  * our cached copy.  If they are different, the card has been
542  * replaced, and we need to tell the drivers.
543  */
544 static int socket_resume(struct pcmcia_socket *skt)
545 {
546 	int err;
547 	if (!(skt->state & SOCKET_SUSPEND))
548 		return -EBUSY;
549 
550 	socket_early_resume(skt);
551 	err = socket_late_resume(skt);
552 	if (!err)
553 		err = socket_complete_resume(skt);
554 	return err;
555 }
556 
557 static void socket_remove(struct pcmcia_socket *skt)
558 {
559 	dev_notice(&skt->dev, "pccard: card ejected from slot %d\n", skt->sock);
560 	socket_shutdown(skt);
561 }
562 
563 /*
564  * Process a socket card detect status change.
565  *
566  * If we don't have a card already present, delay the detect event for
567  * about 20ms (to be on the safe side) before reading the socket status.
568  *
569  * Some i82365-based systems send multiple SS_DETECT events during card
570  * insertion, and the "card present" status bit seems to bounce.  This
571  * will probably be true with GPIO-based card detection systems after
572  * the product has aged.
573  */
574 static void socket_detect_change(struct pcmcia_socket *skt)
575 {
576 	if (!(skt->state & SOCKET_SUSPEND)) {
577 		int status;
578 
579 		if (!(skt->state & SOCKET_PRESENT))
580 			msleep(20);
581 
582 		skt->ops->get_status(skt, &status);
583 		if ((skt->state & SOCKET_PRESENT) &&
584 		     !(status & SS_DETECT))
585 			socket_remove(skt);
586 		if (!(skt->state & SOCKET_PRESENT) &&
587 		    (status & SS_DETECT))
588 			socket_insert(skt);
589 	}
590 }
591 
592 static int pccardd(void *__skt)
593 {
594 	struct pcmcia_socket *skt = __skt;
595 	int ret;
596 
597 	skt->thread = current;
598 	skt->socket = dead_socket;
599 	skt->ops->init(skt);
600 	skt->ops->set_socket(skt, &skt->socket);
601 
602 	/* register with the device core */
603 	ret = device_register(&skt->dev);
604 	if (ret) {
605 		dev_warn(&skt->dev, "PCMCIA: unable to register socket\n");
606 		skt->thread = NULL;
607 		complete(&skt->thread_done);
608 		return 0;
609 	}
610 	ret = pccard_sysfs_add_socket(&skt->dev);
611 	if (ret)
612 		dev_warn(&skt->dev, "err %d adding socket attributes\n", ret);
613 
614 	complete(&skt->thread_done);
615 
616 	/* wait for userspace to catch up */
617 	msleep(250);
618 
619 	set_freezable();
620 	for (;;) {
621 		unsigned long flags;
622 		unsigned int events;
623 		unsigned int sysfs_events;
624 
625 		spin_lock_irqsave(&skt->thread_lock, flags);
626 		events = skt->thread_events;
627 		skt->thread_events = 0;
628 		sysfs_events = skt->sysfs_events;
629 		skt->sysfs_events = 0;
630 		spin_unlock_irqrestore(&skt->thread_lock, flags);
631 
632 		mutex_lock(&skt->skt_mutex);
633 		if (events & SS_DETECT)
634 			socket_detect_change(skt);
635 
636 		if (sysfs_events) {
637 			if (sysfs_events & PCMCIA_UEVENT_EJECT)
638 				socket_remove(skt);
639 			if (sysfs_events & PCMCIA_UEVENT_INSERT)
640 				socket_insert(skt);
641 			if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) &&
642 				!(skt->state & SOCKET_CARDBUS)) {
643 				if (skt->callback)
644 					ret = skt->callback->suspend(skt);
645 				else
646 					ret = 0;
647 				if (!ret) {
648 					socket_suspend(skt);
649 					msleep(100);
650 				}
651 			}
652 			if ((sysfs_events & PCMCIA_UEVENT_RESUME) &&
653 				!(skt->state & SOCKET_CARDBUS)) {
654 				ret = socket_resume(skt);
655 				if (!ret && skt->callback)
656 					skt->callback->resume(skt);
657 			}
658 			if ((sysfs_events & PCMCIA_UEVENT_REQUERY) &&
659 				!(skt->state & SOCKET_CARDBUS)) {
660 				if (!ret && skt->callback)
661 					skt->callback->requery(skt);
662 			}
663 		}
664 		mutex_unlock(&skt->skt_mutex);
665 
666 		if (events || sysfs_events)
667 			continue;
668 
669 		set_current_state(TASK_INTERRUPTIBLE);
670 		if (kthread_should_stop())
671 			break;
672 
673 		schedule();
674 
675 		try_to_freeze();
676 	}
677 	/* make sure we are running before we exit */
678 	__set_current_state(TASK_RUNNING);
679 
680 	/* shut down socket, if a device is still present */
681 	if (skt->state & SOCKET_PRESENT) {
682 		mutex_lock(&skt->skt_mutex);
683 		socket_remove(skt);
684 		mutex_unlock(&skt->skt_mutex);
685 	}
686 
687 	/* remove from the device core */
688 	pccard_sysfs_remove_socket(&skt->dev);
689 	device_unregister(&skt->dev);
690 
691 	return 0;
692 }
693 
694 /*
695  * Yenta (at least) probes interrupts before registering the socket and
696  * starting the handler thread.
697  */
698 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events)
699 {
700 	unsigned long flags;
701 	dev_dbg(&s->dev, "parse_events: events %08x\n", events);
702 	if (s->thread) {
703 		spin_lock_irqsave(&s->thread_lock, flags);
704 		s->thread_events |= events;
705 		spin_unlock_irqrestore(&s->thread_lock, flags);
706 
707 		wake_up_process(s->thread);
708 	}
709 } /* pcmcia_parse_events */
710 EXPORT_SYMBOL(pcmcia_parse_events);
711 
712 /**
713  * pcmcia_parse_uevents() - tell pccardd to issue manual commands
714  * @s:		the PCMCIA socket we wan't to command
715  * @events:	events to pass to pccardd
716  *
717  * userspace-issued insert, eject, suspend and resume commands must be
718  * handled by pccardd to avoid any sysfs-related deadlocks. Valid events
719  * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert),
720  * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend)
721  * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card).
722  */
723 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events)
724 {
725 	unsigned long flags;
726 	dev_dbg(&s->dev, "parse_uevents: events %08x\n", events);
727 	if (s->thread) {
728 		spin_lock_irqsave(&s->thread_lock, flags);
729 		s->sysfs_events |= events;
730 		spin_unlock_irqrestore(&s->thread_lock, flags);
731 
732 		wake_up_process(s->thread);
733 	}
734 }
735 EXPORT_SYMBOL(pcmcia_parse_uevents);
736 
737 
738 /* register pcmcia_callback */
739 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
740 {
741 	int ret = 0;
742 
743 	/* s->skt_mutex also protects s->callback */
744 	mutex_lock(&s->skt_mutex);
745 
746 	if (c) {
747 		/* registration */
748 		if (s->callback) {
749 			ret = -EBUSY;
750 			goto err;
751 		}
752 
753 		s->callback = c;
754 
755 		if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT)
756 			s->callback->add(s);
757 	} else
758 		s->callback = NULL;
759  err:
760 	mutex_unlock(&s->skt_mutex);
761 
762 	return ret;
763 }
764 EXPORT_SYMBOL(pccard_register_pcmcia);
765 
766 
767 /* I'm not sure which "reset" function this is supposed to use,
768  * but for now, it uses the low-level interface's reset, not the
769  * CIS register.
770  */
771 
772 int pcmcia_reset_card(struct pcmcia_socket *skt)
773 {
774 	int ret;
775 
776 	dev_dbg(&skt->dev, "resetting socket\n");
777 
778 	mutex_lock(&skt->skt_mutex);
779 	do {
780 		if (!(skt->state & SOCKET_PRESENT)) {
781 			dev_dbg(&skt->dev, "can't reset, not present\n");
782 			ret = -ENODEV;
783 			break;
784 		}
785 		if (skt->state & SOCKET_SUSPEND) {
786 			dev_dbg(&skt->dev, "can't reset, suspended\n");
787 			ret = -EBUSY;
788 			break;
789 		}
790 		if (skt->state & SOCKET_CARDBUS) {
791 			dev_dbg(&skt->dev, "can't reset, is cardbus\n");
792 			ret = -EPERM;
793 			break;
794 		}
795 
796 		if (skt->callback)
797 			skt->callback->suspend(skt);
798 		mutex_lock(&skt->ops_mutex);
799 		ret = socket_reset(skt);
800 		mutex_unlock(&skt->ops_mutex);
801 		if ((ret == 0) && (skt->callback))
802 			skt->callback->resume(skt);
803 
804 		ret = 0;
805 	} while (0);
806 	mutex_unlock(&skt->skt_mutex);
807 
808 	return ret;
809 } /* reset_card */
810 EXPORT_SYMBOL(pcmcia_reset_card);
811 
812 
813 static int pcmcia_socket_uevent(const struct device *dev,
814 				struct kobj_uevent_env *env)
815 {
816 	const struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
817 
818 	if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
819 		return -ENOMEM;
820 
821 	return 0;
822 }
823 
824 
825 static struct completion pcmcia_unload;
826 
827 static void pcmcia_release_socket_class(const struct class *data)
828 {
829 	complete(&pcmcia_unload);
830 }
831 
832 
833 #ifdef CONFIG_PM
834 
835 static int __pcmcia_pm_op(struct device *dev,
836 			  int (*callback) (struct pcmcia_socket *skt))
837 {
838 	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
839 	int ret;
840 
841 	mutex_lock(&s->skt_mutex);
842 	ret = callback(s);
843 	mutex_unlock(&s->skt_mutex);
844 
845 	return ret;
846 }
847 
848 static int pcmcia_socket_dev_suspend_noirq(struct device *dev)
849 {
850 	return __pcmcia_pm_op(dev, socket_suspend);
851 }
852 
853 static int pcmcia_socket_dev_resume_noirq(struct device *dev)
854 {
855 	return __pcmcia_pm_op(dev, socket_early_resume);
856 }
857 
858 static int __used pcmcia_socket_dev_resume(struct device *dev)
859 {
860 	return __pcmcia_pm_op(dev, socket_late_resume);
861 }
862 
863 static void __used pcmcia_socket_dev_complete(struct device *dev)
864 {
865 	WARN(__pcmcia_pm_op(dev, socket_complete_resume),
866 		"failed to complete resume");
867 }
868 
869 static const struct dev_pm_ops pcmcia_socket_pm_ops = {
870 	/* dev_resume may be called with IRQs enabled */
871 	SET_SYSTEM_SLEEP_PM_OPS(NULL,
872 				pcmcia_socket_dev_resume)
873 
874 	/* late suspend must be called with IRQs disabled */
875 	.suspend_noirq = pcmcia_socket_dev_suspend_noirq,
876 	.freeze_noirq = pcmcia_socket_dev_suspend_noirq,
877 	.poweroff_noirq = pcmcia_socket_dev_suspend_noirq,
878 
879 	/* early resume must be called with IRQs disabled */
880 	.resume_noirq = pcmcia_socket_dev_resume_noirq,
881 	.thaw_noirq = pcmcia_socket_dev_resume_noirq,
882 	.restore_noirq = pcmcia_socket_dev_resume_noirq,
883 	.complete = pcmcia_socket_dev_complete,
884 };
885 
886 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops)
887 
888 #else /* CONFIG_PM */
889 
890 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL
891 
892 #endif /* CONFIG_PM */
893 
894 struct class pcmcia_socket_class = {
895 	.name = "pcmcia_socket",
896 	.dev_uevent = pcmcia_socket_uevent,
897 	.dev_release = pcmcia_release_socket,
898 	.class_release = pcmcia_release_socket_class,
899 	.pm = PCMCIA_SOCKET_CLASS_PM_OPS,
900 };
901 EXPORT_SYMBOL(pcmcia_socket_class);
902 
903 
904 static int __init init_pcmcia_cs(void)
905 {
906 	init_completion(&pcmcia_unload);
907 	return class_register(&pcmcia_socket_class);
908 }
909 
910 static void __exit exit_pcmcia_cs(void)
911 {
912 	class_unregister(&pcmcia_socket_class);
913 	wait_for_completion(&pcmcia_unload);
914 }
915 
916 subsys_initcall(init_pcmcia_cs);
917 module_exit(exit_pcmcia_cs);
918 
919