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1da177e4 LT |
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/config.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/major.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/timer.h> | |
27 | #include <linux/ioport.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/pm.h> | |
30 | #include <linux/pci.h> | |
31 | #include <linux/device.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/irq.h> | |
34 | ||
35 | #define IN_CARD_SERVICES | |
1da177e4 LT |
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 | ||
1da177e4 LT |
45 | |
46 | /* Module parameters */ | |
47 | ||
48 | MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>"); | |
33519ddd | 49 | MODULE_DESCRIPTION("Linux Kernel Card Services"); |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
77 | |
78 | socket_state_t dead_socket = { | |
79 | .csc_mask = SS_DETECT, | |
80 | }; | |
33519ddd | 81 | EXPORT_SYMBOL(dead_socket); |
1da177e4 LT |
82 | |
83 | ||
84 | /* List of all sockets, protected by a rwsem */ | |
85 | LIST_HEAD(pcmcia_socket_list); | |
1da177e4 | 86 | EXPORT_SYMBOL(pcmcia_socket_list); |
1da177e4 | 87 | |
33519ddd DB |
88 | DECLARE_RWSEM(pcmcia_socket_list_rwsem); |
89 | EXPORT_SYMBOL(pcmcia_socket_list_rwsem); | |
1da177e4 | 90 | |
1da177e4 LT |
91 | |
92 | /** | |
33519ddd DB |
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 | |
1da177e4 LT |
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.dev != dev) | |
113 | continue; | |
114 | down(&socket->skt_sem); | |
115 | socket_suspend(socket); | |
116 | up(&socket->skt_sem); | |
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.dev != dev) | |
131 | continue; | |
132 | down(&socket->skt_sem); | |
133 | socket_resume(socket); | |
134 | up(&socket->skt_sem); | |
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 class_device *cl_dev = class_device_get(&skt->dev); | |
146 | if (!cl_dev) | |
147 | return NULL; | |
148 | skt = class_get_devdata(cl_dev); | |
149 | if (!try_module_get(skt->owner)) { | |
150 | class_device_put(&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 | class_device_put(&skt->dev); | |
162 | } | |
163 | EXPORT_SYMBOL(pcmcia_put_socket); | |
164 | ||
165 | ||
166 | static void pcmcia_release_socket(struct class_device *class_dev) | |
167 | { | |
168 | struct pcmcia_socket *socket = class_get_devdata(class_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 | */ | |
178 | int pcmcia_register_socket(struct pcmcia_socket *socket) | |
179 | { | |
180 | int ret; | |
181 | ||
182 | if (!socket || !socket->ops || !socket->dev.dev || !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 | if (socket->resource_ops->init) { | |
190 | ret = socket->resource_ops->init(socket); | |
191 | if (ret) | |
192 | return (ret); | |
193 | } | |
194 | ||
195 | /* try to obtain a socket number [yes, it gets ugly if we | |
33519ddd DB |
196 | * register more than 2^sizeof(unsigned int) pcmcia |
197 | * sockets... but the socket number is deprecated | |
1da177e4 LT |
198 | * anyways, so I don't care] */ |
199 | down_write(&pcmcia_socket_list_rwsem); | |
200 | if (list_empty(&pcmcia_socket_list)) | |
201 | socket->sock = 0; | |
202 | else { | |
203 | unsigned int found, i = 1; | |
204 | struct pcmcia_socket *tmp; | |
205 | do { | |
206 | found = 1; | |
207 | list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { | |
208 | if (tmp->sock == i) | |
209 | found = 0; | |
210 | } | |
211 | i++; | |
212 | } while (!found); | |
213 | socket->sock = i - 1; | |
214 | } | |
215 | list_add_tail(&socket->socket_list, &pcmcia_socket_list); | |
216 | up_write(&pcmcia_socket_list_rwsem); | |
217 | ||
218 | ||
219 | /* set proper values in socket->dev */ | |
220 | socket->dev.class_data = socket; | |
221 | socket->dev.class = &pcmcia_socket_class; | |
222 | snprintf(socket->dev.class_id, BUS_ID_SIZE, "pcmcia_socket%u", socket->sock); | |
223 | ||
224 | /* base address = 0, map = 0 */ | |
225 | socket->cis_mem.flags = 0; | |
226 | socket->cis_mem.speed = cis_speed; | |
227 | ||
228 | INIT_LIST_HEAD(&socket->cis_cache); | |
229 | ||
230 | init_completion(&socket->socket_released); | |
231 | init_completion(&socket->thread_done); | |
232 | init_waitqueue_head(&socket->thread_wait); | |
233 | init_MUTEX(&socket->skt_sem); | |
234 | spin_lock_init(&socket->thread_lock); | |
235 | ||
236 | ret = kernel_thread(pccardd, socket, CLONE_KERNEL); | |
237 | if (ret < 0) | |
238 | goto err; | |
239 | ||
240 | wait_for_completion(&socket->thread_done); | |
241 | if(!socket->thread) { | |
242 | printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket); | |
243 | return -EIO; | |
244 | } | |
245 | pcmcia_parse_events(socket, SS_DETECT); | |
246 | ||
247 | return 0; | |
248 | ||
249 | err: | |
250 | down_write(&pcmcia_socket_list_rwsem); | |
251 | list_del(&socket->socket_list); | |
252 | up_write(&pcmcia_socket_list_rwsem); | |
253 | return ret; | |
254 | } /* pcmcia_register_socket */ | |
255 | EXPORT_SYMBOL(pcmcia_register_socket); | |
256 | ||
257 | ||
258 | /** | |
259 | * pcmcia_unregister_socket - remove a pcmcia socket device | |
260 | */ | |
261 | void pcmcia_unregister_socket(struct pcmcia_socket *socket) | |
262 | { | |
263 | if (!socket) | |
264 | return; | |
265 | ||
266 | cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops); | |
267 | ||
268 | if (socket->thread) { | |
269 | init_completion(&socket->thread_done); | |
270 | socket->thread = NULL; | |
271 | wake_up(&socket->thread_wait); | |
272 | wait_for_completion(&socket->thread_done); | |
273 | } | |
274 | release_cis_mem(socket); | |
275 | ||
276 | /* remove from our own list */ | |
277 | down_write(&pcmcia_socket_list_rwsem); | |
278 | list_del(&socket->socket_list); | |
279 | up_write(&pcmcia_socket_list_rwsem); | |
280 | ||
281 | /* wait for sysfs to drop all references */ | |
282 | release_resource_db(socket); | |
283 | wait_for_completion(&socket->socket_released); | |
284 | } /* pcmcia_unregister_socket */ | |
285 | EXPORT_SYMBOL(pcmcia_unregister_socket); | |
286 | ||
287 | ||
288 | struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr) | |
289 | { | |
290 | struct pcmcia_socket *s; | |
291 | ||
292 | down_read(&pcmcia_socket_list_rwsem); | |
293 | list_for_each_entry(s, &pcmcia_socket_list, socket_list) | |
294 | if (s->sock == nr) { | |
295 | up_read(&pcmcia_socket_list_rwsem); | |
296 | return s; | |
297 | } | |
298 | up_read(&pcmcia_socket_list_rwsem); | |
299 | ||
300 | return NULL; | |
301 | ||
302 | } | |
303 | EXPORT_SYMBOL(pcmcia_get_socket_by_nr); | |
304 | ||
305 | ||
33519ddd DB |
306 | /** |
307 | * socket_setup() and shutdown_socket() are called by the main event | |
308 | * handler when card insertion and removal events are received. | |
309 | * socket_setup() turns on socket power and resets the socket, in two stages. | |
310 | * shutdown_socket() unconfigures a socket and turns off socket power. | |
311 | */ | |
1da177e4 LT |
312 | static void shutdown_socket(struct pcmcia_socket *s) |
313 | { | |
33519ddd DB |
314 | cs_dbg(s, 1, "shutdown_socket\n"); |
315 | ||
316 | /* Blank out the socket state */ | |
317 | s->socket = dead_socket; | |
318 | s->ops->init(s); | |
319 | s->ops->set_socket(s, &s->socket); | |
320 | s->irq.AssignedIRQ = s->irq.Config = 0; | |
321 | s->lock_count = 0; | |
322 | destroy_cis_cache(s); | |
1da177e4 | 323 | #ifdef CONFIG_CARDBUS |
33519ddd | 324 | cb_free(s); |
1da177e4 | 325 | #endif |
33519ddd DB |
326 | s->functions = 0; |
327 | if (s->config) { | |
328 | kfree(s->config); | |
329 | s->config = NULL; | |
1da177e4 | 330 | } |
1da177e4 | 331 | |
33519ddd DB |
332 | { |
333 | int status; | |
334 | s->ops->get_status(s, &status); | |
335 | if (status & SS_POWERON) { | |
336 | printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s); | |
337 | } | |
338 | } | |
339 | } /* shutdown_socket */ | |
1da177e4 | 340 | |
1da177e4 | 341 | |
33519ddd DB |
342 | /** |
343 | * The central event handler. Send_event() sends an event to the | |
344 | * 16-bit subsystem, which then calls the relevant device drivers. | |
345 | * Parse_events() interprets the event bits from | |
346 | * a card status change report. Do_shutdown() handles the high | |
347 | * priority stuff associated with a card removal. | |
348 | */ | |
1da177e4 LT |
349 | |
350 | /* NOTE: send_event needs to be called with skt->sem held. */ | |
351 | ||
352 | static int send_event(struct pcmcia_socket *s, event_t event, int priority) | |
353 | { | |
354 | int ret; | |
355 | ||
356 | if (s->state & SOCKET_CARDBUS) | |
357 | return 0; | |
358 | ||
359 | cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n", | |
360 | event, priority, s->callback); | |
361 | ||
362 | if (!s->callback) | |
363 | return 0; | |
364 | if (!try_module_get(s->callback->owner)) | |
365 | return 0; | |
366 | ||
367 | ret = s->callback->event(s, event, priority); | |
368 | ||
369 | module_put(s->callback->owner); | |
370 | ||
371 | return ret; | |
372 | } | |
373 | ||
374 | static void socket_remove_drivers(struct pcmcia_socket *skt) | |
375 | { | |
376 | cs_dbg(skt, 4, "remove_drivers\n"); | |
377 | ||
378 | send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH); | |
379 | } | |
380 | ||
381 | static void socket_shutdown(struct pcmcia_socket *skt) | |
382 | { | |
383 | cs_dbg(skt, 4, "shutdown\n"); | |
384 | ||
385 | socket_remove_drivers(skt); | |
386 | skt->state &= SOCKET_INUSE|SOCKET_PRESENT; | |
387 | msleep(shutdown_delay * 10); | |
388 | skt->state &= SOCKET_INUSE; | |
389 | shutdown_socket(skt); | |
390 | } | |
391 | ||
392 | static int socket_reset(struct pcmcia_socket *skt) | |
393 | { | |
394 | int status, i; | |
395 | ||
396 | cs_dbg(skt, 4, "reset\n"); | |
397 | ||
398 | skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; | |
399 | skt->ops->set_socket(skt, &skt->socket); | |
400 | udelay((long)reset_time); | |
401 | ||
402 | skt->socket.flags &= ~SS_RESET; | |
403 | skt->ops->set_socket(skt, &skt->socket); | |
404 | ||
405 | msleep(unreset_delay * 10); | |
406 | for (i = 0; i < unreset_limit; i++) { | |
407 | skt->ops->get_status(skt, &status); | |
408 | ||
409 | if (!(status & SS_DETECT)) | |
410 | return CS_NO_CARD; | |
411 | ||
412 | if (status & SS_READY) | |
413 | return CS_SUCCESS; | |
414 | ||
415 | msleep(unreset_check * 10); | |
416 | } | |
417 | ||
418 | cs_err(skt, "time out after reset.\n"); | |
419 | return CS_GENERAL_FAILURE; | |
420 | } | |
421 | ||
422 | static int socket_setup(struct pcmcia_socket *skt, int initial_delay) | |
423 | { | |
424 | int status, i; | |
425 | ||
426 | cs_dbg(skt, 4, "setup\n"); | |
427 | ||
428 | skt->ops->get_status(skt, &status); | |
429 | if (!(status & SS_DETECT)) | |
430 | return CS_NO_CARD; | |
431 | ||
432 | msleep(initial_delay * 10); | |
433 | ||
434 | for (i = 0; i < 100; i++) { | |
435 | skt->ops->get_status(skt, &status); | |
436 | if (!(status & SS_DETECT)) | |
437 | return CS_NO_CARD; | |
438 | ||
439 | if (!(status & SS_PENDING)) | |
440 | break; | |
441 | ||
442 | msleep(100); | |
443 | } | |
444 | ||
445 | if (status & SS_PENDING) { | |
446 | cs_err(skt, "voltage interrogation timed out.\n"); | |
447 | return CS_GENERAL_FAILURE; | |
448 | } | |
449 | ||
450 | if (status & SS_CARDBUS) { | |
451 | skt->state |= SOCKET_CARDBUS; | |
452 | #ifndef CONFIG_CARDBUS | |
453 | cs_err(skt, "cardbus cards are not supported.\n"); | |
454 | return CS_BAD_TYPE; | |
455 | #endif | |
456 | } | |
457 | ||
458 | /* | |
459 | * Decode the card voltage requirements, and apply power to the card. | |
460 | */ | |
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; | |
465 | else { | |
466 | cs_err(skt, "unsupported voltage key.\n"); | |
467 | return CS_BAD_TYPE; | |
468 | } | |
fa912bcb DR |
469 | |
470 | if (skt->power_hook) | |
471 | skt->power_hook(skt, HOOK_POWER_PRE); | |
472 | ||
1da177e4 LT |
473 | skt->socket.flags = 0; |
474 | skt->ops->set_socket(skt, &skt->socket); | |
475 | ||
476 | /* | |
477 | * Wait "vcc_settle" for the supply to stabilise. | |
478 | */ | |
479 | msleep(vcc_settle * 10); | |
480 | ||
481 | skt->ops->get_status(skt, &status); | |
482 | if (!(status & SS_POWERON)) { | |
483 | cs_err(skt, "unable to apply power.\n"); | |
484 | return CS_BAD_TYPE; | |
485 | } | |
486 | ||
fa912bcb DR |
487 | status = socket_reset(skt); |
488 | ||
489 | if (skt->power_hook) | |
490 | skt->power_hook(skt, HOOK_POWER_POST); | |
491 | ||
492 | return status; | |
1da177e4 LT |
493 | } |
494 | ||
495 | /* | |
496 | * Handle card insertion. Setup the socket, reset the card, | |
497 | * and then tell the rest of PCMCIA that a card is present. | |
498 | */ | |
499 | static int socket_insert(struct pcmcia_socket *skt) | |
500 | { | |
501 | int ret; | |
502 | ||
503 | cs_dbg(skt, 4, "insert\n"); | |
504 | ||
505 | if (!cs_socket_get(skt)) | |
506 | return CS_NO_CARD; | |
507 | ||
508 | ret = socket_setup(skt, setup_delay); | |
509 | if (ret == CS_SUCCESS) { | |
510 | skt->state |= SOCKET_PRESENT; | |
511 | #ifdef CONFIG_CARDBUS | |
512 | if (skt->state & SOCKET_CARDBUS) { | |
513 | cb_alloc(skt); | |
514 | skt->state |= SOCKET_CARDBUS_CONFIG; | |
515 | } | |
516 | #endif | |
517 | cs_dbg(skt, 4, "insert done\n"); | |
518 | ||
519 | send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
520 | } else { | |
521 | socket_shutdown(skt); | |
522 | cs_socket_put(skt); | |
523 | } | |
524 | ||
525 | return ret; | |
526 | } | |
527 | ||
528 | static int socket_suspend(struct pcmcia_socket *skt) | |
529 | { | |
530 | if (skt->state & SOCKET_SUSPEND) | |
531 | return CS_IN_USE; | |
532 | ||
533 | send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); | |
534 | skt->socket = dead_socket; | |
535 | skt->ops->set_socket(skt, &skt->socket); | |
536 | if (skt->ops->suspend) | |
537 | skt->ops->suspend(skt); | |
538 | skt->state |= SOCKET_SUSPEND; | |
539 | ||
540 | return CS_SUCCESS; | |
541 | } | |
542 | ||
543 | /* | |
544 | * Resume a socket. If a card is present, verify its CIS against | |
545 | * our cached copy. If they are different, the card has been | |
546 | * replaced, and we need to tell the drivers. | |
547 | */ | |
548 | static int socket_resume(struct pcmcia_socket *skt) | |
549 | { | |
550 | int ret; | |
551 | ||
552 | if (!(skt->state & SOCKET_SUSPEND)) | |
553 | return CS_IN_USE; | |
554 | ||
555 | skt->socket = dead_socket; | |
556 | skt->ops->init(skt); | |
557 | skt->ops->set_socket(skt, &skt->socket); | |
558 | ||
559 | if (!(skt->state & SOCKET_PRESENT)) { | |
560 | skt->state &= ~SOCKET_SUSPEND; | |
561 | return socket_insert(skt); | |
562 | } | |
563 | ||
564 | ret = socket_setup(skt, resume_delay); | |
565 | if (ret == CS_SUCCESS) { | |
566 | /* | |
567 | * FIXME: need a better check here for cardbus cards. | |
568 | */ | |
569 | if (verify_cis_cache(skt) != 0) { | |
570 | cs_dbg(skt, 4, "cis mismatch - different card\n"); | |
571 | socket_remove_drivers(skt); | |
572 | destroy_cis_cache(skt); | |
573 | /* | |
574 | * Workaround: give DS time to schedule removal. | |
575 | * Remove me once the 100ms delay is eliminated | |
576 | * in ds.c | |
577 | */ | |
578 | msleep(200); | |
579 | send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
580 | } else { | |
581 | cs_dbg(skt, 4, "cis matches cache\n"); | |
582 | send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); | |
583 | } | |
584 | } else { | |
585 | socket_shutdown(skt); | |
586 | cs_socket_put(skt); | |
587 | } | |
588 | ||
589 | skt->state &= ~SOCKET_SUSPEND; | |
590 | ||
591 | return CS_SUCCESS; | |
592 | } | |
593 | ||
594 | static void socket_remove(struct pcmcia_socket *skt) | |
595 | { | |
596 | socket_shutdown(skt); | |
597 | cs_socket_put(skt); | |
598 | } | |
599 | ||
600 | /* | |
601 | * Process a socket card detect status change. | |
602 | * | |
603 | * If we don't have a card already present, delay the detect event for | |
604 | * about 20ms (to be on the safe side) before reading the socket status. | |
605 | * | |
606 | * Some i82365-based systems send multiple SS_DETECT events during card | |
607 | * insertion, and the "card present" status bit seems to bounce. This | |
608 | * will probably be true with GPIO-based card detection systems after | |
609 | * the product has aged. | |
610 | */ | |
611 | static void socket_detect_change(struct pcmcia_socket *skt) | |
612 | { | |
613 | if (!(skt->state & SOCKET_SUSPEND)) { | |
614 | int status; | |
615 | ||
616 | if (!(skt->state & SOCKET_PRESENT)) | |
617 | msleep(20); | |
618 | ||
619 | skt->ops->get_status(skt, &status); | |
620 | if ((skt->state & SOCKET_PRESENT) && | |
621 | !(status & SS_DETECT)) | |
622 | socket_remove(skt); | |
623 | if (!(skt->state & SOCKET_PRESENT) && | |
624 | (status & SS_DETECT)) | |
625 | socket_insert(skt); | |
626 | } | |
627 | } | |
628 | ||
629 | static int pccardd(void *__skt) | |
630 | { | |
631 | struct pcmcia_socket *skt = __skt; | |
632 | DECLARE_WAITQUEUE(wait, current); | |
633 | int ret; | |
634 | ||
635 | daemonize("pccardd"); | |
636 | ||
637 | skt->thread = current; | |
638 | skt->socket = dead_socket; | |
639 | skt->ops->init(skt); | |
640 | skt->ops->set_socket(skt, &skt->socket); | |
641 | ||
642 | /* register with the device core */ | |
643 | ret = class_device_register(&skt->dev); | |
644 | if (ret) { | |
645 | printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n", | |
646 | skt); | |
647 | skt->thread = NULL; | |
648 | complete_and_exit(&skt->thread_done, 0); | |
649 | } | |
650 | complete(&skt->thread_done); | |
651 | ||
652 | add_wait_queue(&skt->thread_wait, &wait); | |
653 | for (;;) { | |
654 | unsigned long flags; | |
655 | unsigned int events; | |
656 | ||
657 | set_current_state(TASK_INTERRUPTIBLE); | |
658 | ||
659 | spin_lock_irqsave(&skt->thread_lock, flags); | |
660 | events = skt->thread_events; | |
661 | skt->thread_events = 0; | |
662 | spin_unlock_irqrestore(&skt->thread_lock, flags); | |
663 | ||
664 | if (events) { | |
665 | down(&skt->skt_sem); | |
666 | if (events & SS_DETECT) | |
667 | socket_detect_change(skt); | |
668 | if (events & SS_BATDEAD) | |
669 | send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); | |
670 | if (events & SS_BATWARN) | |
671 | send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); | |
672 | if (events & SS_READY) | |
673 | send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); | |
674 | up(&skt->skt_sem); | |
675 | continue; | |
676 | } | |
677 | ||
678 | schedule(); | |
3e1d1d28 | 679 | try_to_freeze(); |
1da177e4 LT |
680 | |
681 | if (!skt->thread) | |
682 | break; | |
683 | } | |
684 | remove_wait_queue(&skt->thread_wait, &wait); | |
685 | ||
686 | /* remove from the device core */ | |
687 | class_device_unregister(&skt->dev); | |
688 | ||
689 | complete_and_exit(&skt->thread_done, 0); | |
690 | } | |
691 | ||
692 | /* | |
693 | * Yenta (at least) probes interrupts before registering the socket and | |
694 | * starting the handler thread. | |
695 | */ | |
696 | void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) | |
697 | { | |
698 | cs_dbg(s, 4, "parse_events: events %08x\n", events); | |
699 | if (s->thread) { | |
700 | spin_lock(&s->thread_lock); | |
701 | s->thread_events |= events; | |
702 | spin_unlock(&s->thread_lock); | |
703 | ||
704 | wake_up(&s->thread_wait); | |
705 | } | |
706 | } /* pcmcia_parse_events */ | |
33519ddd | 707 | EXPORT_SYMBOL(pcmcia_parse_events); |
1da177e4 | 708 | |
1da177e4 LT |
709 | |
710 | /* register pcmcia_callback */ | |
711 | int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) | |
712 | { | |
713 | int ret = 0; | |
714 | ||
715 | /* s->skt_sem also protects s->callback */ | |
716 | down(&s->skt_sem); | |
717 | ||
718 | if (c) { | |
719 | /* registration */ | |
720 | if (s->callback) { | |
721 | ret = -EBUSY; | |
722 | goto err; | |
723 | } | |
724 | ||
725 | s->callback = c; | |
726 | ||
727 | if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) | |
728 | send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
729 | } else | |
730 | s->callback = NULL; | |
731 | err: | |
732 | up(&s->skt_sem); | |
733 | ||
734 | return ret; | |
735 | } | |
736 | EXPORT_SYMBOL(pccard_register_pcmcia); | |
737 | ||
1da177e4 | 738 | |
33519ddd DB |
739 | /* I'm not sure which "reset" function this is supposed to use, |
740 | * but for now, it uses the low-level interface's reset, not the | |
741 | * CIS register. | |
742 | */ | |
1da177e4 LT |
743 | |
744 | int pccard_reset_card(struct pcmcia_socket *skt) | |
745 | { | |
746 | int ret; | |
33519ddd | 747 | |
1da177e4 LT |
748 | cs_dbg(skt, 1, "resetting socket\n"); |
749 | ||
750 | down(&skt->skt_sem); | |
751 | do { | |
752 | if (!(skt->state & SOCKET_PRESENT)) { | |
753 | ret = CS_NO_CARD; | |
754 | break; | |
755 | } | |
756 | if (skt->state & SOCKET_SUSPEND) { | |
757 | ret = CS_IN_USE; | |
758 | break; | |
759 | } | |
760 | if (skt->state & SOCKET_CARDBUS) { | |
761 | ret = CS_UNSUPPORTED_FUNCTION; | |
762 | break; | |
763 | } | |
764 | ||
765 | ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); | |
766 | if (ret == 0) { | |
767 | send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); | |
768 | if (socket_reset(skt) == CS_SUCCESS) | |
769 | send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); | |
770 | } | |
771 | ||
772 | ret = CS_SUCCESS; | |
773 | } while (0); | |
774 | up(&skt->skt_sem); | |
775 | ||
776 | return ret; | |
777 | } /* reset_card */ | |
778 | EXPORT_SYMBOL(pccard_reset_card); | |
779 | ||
1da177e4 | 780 | |
33519ddd DB |
781 | /* These shut down or wake up a socket. They are sort of user |
782 | * initiated versions of the APM suspend and resume actions. | |
783 | */ | |
1da177e4 LT |
784 | int pcmcia_suspend_card(struct pcmcia_socket *skt) |
785 | { | |
786 | int ret; | |
33519ddd | 787 | |
1da177e4 LT |
788 | cs_dbg(skt, 1, "suspending socket\n"); |
789 | ||
790 | down(&skt->skt_sem); | |
791 | do { | |
792 | if (!(skt->state & SOCKET_PRESENT)) { | |
793 | ret = CS_NO_CARD; | |
794 | break; | |
795 | } | |
796 | if (skt->state & SOCKET_CARDBUS) { | |
797 | ret = CS_UNSUPPORTED_FUNCTION; | |
798 | break; | |
799 | } | |
800 | ret = socket_suspend(skt); | |
801 | } while (0); | |
802 | up(&skt->skt_sem); | |
803 | ||
804 | return ret; | |
805 | } /* suspend_card */ | |
33519ddd DB |
806 | EXPORT_SYMBOL(pcmcia_suspend_card); |
807 | ||
1da177e4 LT |
808 | |
809 | int pcmcia_resume_card(struct pcmcia_socket *skt) | |
810 | { | |
811 | int ret; | |
812 | ||
813 | cs_dbg(skt, 1, "waking up socket\n"); | |
814 | ||
815 | down(&skt->skt_sem); | |
816 | do { | |
817 | if (!(skt->state & SOCKET_PRESENT)) { | |
818 | ret = CS_NO_CARD; | |
819 | break; | |
820 | } | |
821 | if (skt->state & SOCKET_CARDBUS) { | |
822 | ret = CS_UNSUPPORTED_FUNCTION; | |
823 | break; | |
824 | } | |
825 | ret = socket_resume(skt); | |
826 | } while (0); | |
827 | up(&skt->skt_sem); | |
828 | ||
829 | return ret; | |
830 | } /* resume_card */ | |
33519ddd | 831 | EXPORT_SYMBOL(pcmcia_resume_card); |
1da177e4 | 832 | |
1da177e4 | 833 | |
33519ddd | 834 | /* These handle user requests to eject or insert a card. */ |
1da177e4 LT |
835 | int pcmcia_eject_card(struct pcmcia_socket *skt) |
836 | { | |
837 | int ret; | |
838 | ||
839 | cs_dbg(skt, 1, "user eject request\n"); | |
840 | ||
841 | down(&skt->skt_sem); | |
842 | do { | |
843 | if (!(skt->state & SOCKET_PRESENT)) { | |
844 | ret = -ENODEV; | |
845 | break; | |
846 | } | |
847 | ||
848 | ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); | |
849 | if (ret != 0) { | |
850 | ret = -EINVAL; | |
851 | break; | |
852 | } | |
853 | ||
854 | socket_remove(skt); | |
855 | ret = 0; | |
856 | } while (0); | |
857 | up(&skt->skt_sem); | |
858 | ||
859 | return ret; | |
860 | } /* eject_card */ | |
33519ddd DB |
861 | EXPORT_SYMBOL(pcmcia_eject_card); |
862 | ||
1da177e4 LT |
863 | |
864 | int pcmcia_insert_card(struct pcmcia_socket *skt) | |
865 | { | |
866 | int ret; | |
867 | ||
868 | cs_dbg(skt, 1, "user insert request\n"); | |
869 | ||
870 | down(&skt->skt_sem); | |
871 | do { | |
872 | if (skt->state & SOCKET_PRESENT) { | |
873 | ret = -EBUSY; | |
874 | break; | |
875 | } | |
876 | if (socket_insert(skt) == CS_NO_CARD) { | |
877 | ret = -ENODEV; | |
878 | break; | |
879 | } | |
880 | ret = 0; | |
881 | } while (0); | |
882 | up(&skt->skt_sem); | |
883 | ||
884 | return ret; | |
885 | } /* insert_card */ | |
33519ddd DB |
886 | EXPORT_SYMBOL(pcmcia_insert_card); |
887 | ||
1da177e4 | 888 | |
3ee13937 DB |
889 | static int pcmcia_socket_hotplug(struct class_device *dev, char **envp, |
890 | int num_envp, char *buffer, int buffer_size) | |
891 | { | |
892 | struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); | |
893 | int i = 0, length = 0; | |
894 | ||
895 | if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
896 | &length, "SOCKET_NO=%u", s->sock)) | |
897 | return -ENOMEM; | |
898 | ||
899 | envp[i] = NULL; | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
1da177e4 | 904 | |
378a33a6 DB |
905 | static struct completion pcmcia_unload; |
906 | ||
907 | static void pcmcia_release_socket_class(struct class *data) | |
908 | { | |
909 | complete(&pcmcia_unload); | |
910 | } | |
911 | ||
912 | ||
1da177e4 LT |
913 | struct class pcmcia_socket_class = { |
914 | .name = "pcmcia_socket", | |
3ee13937 | 915 | .hotplug = pcmcia_socket_hotplug, |
1da177e4 | 916 | .release = pcmcia_release_socket, |
378a33a6 | 917 | .class_release = pcmcia_release_socket_class, |
1da177e4 LT |
918 | }; |
919 | EXPORT_SYMBOL(pcmcia_socket_class); | |
920 | ||
921 | ||
922 | static int __init init_pcmcia_cs(void) | |
923 | { | |
378a33a6 DB |
924 | int ret; |
925 | ||
926 | init_completion(&pcmcia_unload); | |
927 | ret = class_register(&pcmcia_socket_class); | |
1da177e4 LT |
928 | if (ret) |
929 | return (ret); | |
930 | return class_interface_register(&pccard_sysfs_interface); | |
931 | } | |
932 | ||
933 | static void __exit exit_pcmcia_cs(void) | |
934 | { | |
33519ddd DB |
935 | class_interface_unregister(&pccard_sysfs_interface); |
936 | class_unregister(&pcmcia_socket_class); | |
378a33a6 DB |
937 | |
938 | wait_for_completion(&pcmcia_unload); | |
1da177e4 LT |
939 | } |
940 | ||
941 | subsys_initcall(init_pcmcia_cs); | |
942 | module_exit(exit_pcmcia_cs); | |
943 |