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