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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 | ||
5bc6b68a RK |
218 | #ifndef CONFIG_CARDBUS |
219 | /* | |
220 | * If we do not support Cardbus, ensure that | |
221 | * the Cardbus socket capability is disabled. | |
222 | */ | |
223 | socket->features &= ~SS_CAP_CARDBUS; | |
224 | #endif | |
1da177e4 LT |
225 | |
226 | /* set proper values in socket->dev */ | |
227 | socket->dev.class_data = socket; | |
228 | socket->dev.class = &pcmcia_socket_class; | |
229 | snprintf(socket->dev.class_id, BUS_ID_SIZE, "pcmcia_socket%u", socket->sock); | |
230 | ||
231 | /* base address = 0, map = 0 */ | |
232 | socket->cis_mem.flags = 0; | |
233 | socket->cis_mem.speed = cis_speed; | |
234 | ||
235 | INIT_LIST_HEAD(&socket->cis_cache); | |
236 | ||
237 | init_completion(&socket->socket_released); | |
238 | init_completion(&socket->thread_done); | |
239 | init_waitqueue_head(&socket->thread_wait); | |
240 | init_MUTEX(&socket->skt_sem); | |
241 | spin_lock_init(&socket->thread_lock); | |
242 | ||
243 | ret = kernel_thread(pccardd, socket, CLONE_KERNEL); | |
244 | if (ret < 0) | |
245 | goto err; | |
246 | ||
247 | wait_for_completion(&socket->thread_done); | |
248 | if(!socket->thread) { | |
249 | printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket); | |
250 | return -EIO; | |
251 | } | |
252 | pcmcia_parse_events(socket, SS_DETECT); | |
253 | ||
254 | return 0; | |
255 | ||
256 | err: | |
257 | down_write(&pcmcia_socket_list_rwsem); | |
258 | list_del(&socket->socket_list); | |
259 | up_write(&pcmcia_socket_list_rwsem); | |
260 | return ret; | |
261 | } /* pcmcia_register_socket */ | |
262 | EXPORT_SYMBOL(pcmcia_register_socket); | |
263 | ||
264 | ||
265 | /** | |
266 | * pcmcia_unregister_socket - remove a pcmcia socket device | |
267 | */ | |
268 | void pcmcia_unregister_socket(struct pcmcia_socket *socket) | |
269 | { | |
270 | if (!socket) | |
271 | return; | |
272 | ||
273 | cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops); | |
274 | ||
275 | if (socket->thread) { | |
276 | init_completion(&socket->thread_done); | |
277 | socket->thread = NULL; | |
278 | wake_up(&socket->thread_wait); | |
279 | wait_for_completion(&socket->thread_done); | |
280 | } | |
281 | release_cis_mem(socket); | |
282 | ||
283 | /* remove from our own list */ | |
284 | down_write(&pcmcia_socket_list_rwsem); | |
285 | list_del(&socket->socket_list); | |
286 | up_write(&pcmcia_socket_list_rwsem); | |
287 | ||
288 | /* wait for sysfs to drop all references */ | |
289 | release_resource_db(socket); | |
290 | wait_for_completion(&socket->socket_released); | |
291 | } /* pcmcia_unregister_socket */ | |
292 | EXPORT_SYMBOL(pcmcia_unregister_socket); | |
293 | ||
294 | ||
295 | struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr) | |
296 | { | |
297 | struct pcmcia_socket *s; | |
298 | ||
299 | down_read(&pcmcia_socket_list_rwsem); | |
300 | list_for_each_entry(s, &pcmcia_socket_list, socket_list) | |
301 | if (s->sock == nr) { | |
302 | up_read(&pcmcia_socket_list_rwsem); | |
303 | return s; | |
304 | } | |
305 | up_read(&pcmcia_socket_list_rwsem); | |
306 | ||
307 | return NULL; | |
308 | ||
309 | } | |
310 | EXPORT_SYMBOL(pcmcia_get_socket_by_nr); | |
311 | ||
312 | ||
33519ddd DB |
313 | /** |
314 | * socket_setup() and shutdown_socket() are called by the main event | |
315 | * handler when card insertion and removal events are received. | |
316 | * socket_setup() turns on socket power and resets the socket, in two stages. | |
317 | * shutdown_socket() unconfigures a socket and turns off socket power. | |
318 | */ | |
1da177e4 LT |
319 | static void shutdown_socket(struct pcmcia_socket *s) |
320 | { | |
33519ddd DB |
321 | cs_dbg(s, 1, "shutdown_socket\n"); |
322 | ||
323 | /* Blank out the socket state */ | |
324 | s->socket = dead_socket; | |
325 | s->ops->init(s); | |
326 | s->ops->set_socket(s, &s->socket); | |
327 | s->irq.AssignedIRQ = s->irq.Config = 0; | |
328 | s->lock_count = 0; | |
329 | destroy_cis_cache(s); | |
1da177e4 | 330 | #ifdef CONFIG_CARDBUS |
33519ddd | 331 | cb_free(s); |
1da177e4 | 332 | #endif |
33519ddd DB |
333 | s->functions = 0; |
334 | if (s->config) { | |
335 | kfree(s->config); | |
336 | s->config = NULL; | |
1da177e4 | 337 | } |
1da177e4 | 338 | |
33519ddd DB |
339 | { |
340 | int status; | |
341 | s->ops->get_status(s, &status); | |
342 | if (status & SS_POWERON) { | |
343 | printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s); | |
344 | } | |
345 | } | |
346 | } /* shutdown_socket */ | |
1da177e4 | 347 | |
1da177e4 | 348 | |
33519ddd DB |
349 | /** |
350 | * The central event handler. Send_event() sends an event to the | |
351 | * 16-bit subsystem, which then calls the relevant device drivers. | |
352 | * Parse_events() interprets the event bits from | |
353 | * a card status change report. Do_shutdown() handles the high | |
354 | * priority stuff associated with a card removal. | |
355 | */ | |
1da177e4 LT |
356 | |
357 | /* NOTE: send_event needs to be called with skt->sem held. */ | |
358 | ||
359 | static int send_event(struct pcmcia_socket *s, event_t event, int priority) | |
360 | { | |
361 | int ret; | |
362 | ||
363 | if (s->state & SOCKET_CARDBUS) | |
364 | return 0; | |
365 | ||
366 | cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n", | |
367 | event, priority, s->callback); | |
368 | ||
369 | if (!s->callback) | |
370 | return 0; | |
371 | if (!try_module_get(s->callback->owner)) | |
372 | return 0; | |
373 | ||
374 | ret = s->callback->event(s, event, priority); | |
375 | ||
376 | module_put(s->callback->owner); | |
377 | ||
378 | return ret; | |
379 | } | |
380 | ||
381 | static void socket_remove_drivers(struct pcmcia_socket *skt) | |
382 | { | |
383 | cs_dbg(skt, 4, "remove_drivers\n"); | |
384 | ||
385 | send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH); | |
386 | } | |
387 | ||
388 | static void socket_shutdown(struct pcmcia_socket *skt) | |
389 | { | |
390 | cs_dbg(skt, 4, "shutdown\n"); | |
391 | ||
392 | socket_remove_drivers(skt); | |
393 | skt->state &= SOCKET_INUSE|SOCKET_PRESENT; | |
394 | msleep(shutdown_delay * 10); | |
395 | skt->state &= SOCKET_INUSE; | |
396 | shutdown_socket(skt); | |
397 | } | |
398 | ||
399 | static int socket_reset(struct pcmcia_socket *skt) | |
400 | { | |
401 | int status, i; | |
402 | ||
403 | cs_dbg(skt, 4, "reset\n"); | |
404 | ||
405 | skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; | |
406 | skt->ops->set_socket(skt, &skt->socket); | |
407 | udelay((long)reset_time); | |
408 | ||
409 | skt->socket.flags &= ~SS_RESET; | |
410 | skt->ops->set_socket(skt, &skt->socket); | |
411 | ||
412 | msleep(unreset_delay * 10); | |
413 | for (i = 0; i < unreset_limit; i++) { | |
414 | skt->ops->get_status(skt, &status); | |
415 | ||
416 | if (!(status & SS_DETECT)) | |
417 | return CS_NO_CARD; | |
418 | ||
419 | if (status & SS_READY) | |
420 | return CS_SUCCESS; | |
421 | ||
422 | msleep(unreset_check * 10); | |
423 | } | |
424 | ||
425 | cs_err(skt, "time out after reset.\n"); | |
426 | return CS_GENERAL_FAILURE; | |
427 | } | |
428 | ||
429 | static int socket_setup(struct pcmcia_socket *skt, int initial_delay) | |
430 | { | |
431 | int status, i; | |
432 | ||
433 | cs_dbg(skt, 4, "setup\n"); | |
434 | ||
435 | skt->ops->get_status(skt, &status); | |
436 | if (!(status & SS_DETECT)) | |
437 | return CS_NO_CARD; | |
438 | ||
439 | msleep(initial_delay * 10); | |
440 | ||
441 | for (i = 0; i < 100; i++) { | |
442 | skt->ops->get_status(skt, &status); | |
443 | if (!(status & SS_DETECT)) | |
444 | return CS_NO_CARD; | |
445 | ||
446 | if (!(status & SS_PENDING)) | |
447 | break; | |
448 | ||
449 | msleep(100); | |
450 | } | |
451 | ||
452 | if (status & SS_PENDING) { | |
453 | cs_err(skt, "voltage interrogation timed out.\n"); | |
454 | return CS_GENERAL_FAILURE; | |
455 | } | |
456 | ||
457 | if (status & SS_CARDBUS) { | |
5bc6b68a RK |
458 | if (!(skt->features & SS_CAP_CARDBUS)) { |
459 | cs_err(skt, "cardbus cards are not supported.\n"); | |
460 | return CS_BAD_TYPE; | |
461 | } | |
1da177e4 | 462 | skt->state |= SOCKET_CARDBUS; |
1da177e4 LT |
463 | } |
464 | ||
465 | /* | |
466 | * Decode the card voltage requirements, and apply power to the card. | |
467 | */ | |
468 | if (status & SS_3VCARD) | |
469 | skt->socket.Vcc = skt->socket.Vpp = 33; | |
470 | else if (!(status & SS_XVCARD)) | |
471 | skt->socket.Vcc = skt->socket.Vpp = 50; | |
472 | else { | |
473 | cs_err(skt, "unsupported voltage key.\n"); | |
474 | return CS_BAD_TYPE; | |
475 | } | |
fa912bcb DR |
476 | |
477 | if (skt->power_hook) | |
478 | skt->power_hook(skt, HOOK_POWER_PRE); | |
479 | ||
1da177e4 LT |
480 | skt->socket.flags = 0; |
481 | skt->ops->set_socket(skt, &skt->socket); | |
482 | ||
483 | /* | |
484 | * Wait "vcc_settle" for the supply to stabilise. | |
485 | */ | |
486 | msleep(vcc_settle * 10); | |
487 | ||
488 | skt->ops->get_status(skt, &status); | |
489 | if (!(status & SS_POWERON)) { | |
490 | cs_err(skt, "unable to apply power.\n"); | |
491 | return CS_BAD_TYPE; | |
492 | } | |
493 | ||
fa912bcb DR |
494 | status = socket_reset(skt); |
495 | ||
496 | if (skt->power_hook) | |
497 | skt->power_hook(skt, HOOK_POWER_POST); | |
498 | ||
499 | return status; | |
1da177e4 LT |
500 | } |
501 | ||
502 | /* | |
503 | * Handle card insertion. Setup the socket, reset the card, | |
504 | * and then tell the rest of PCMCIA that a card is present. | |
505 | */ | |
506 | static int socket_insert(struct pcmcia_socket *skt) | |
507 | { | |
508 | int ret; | |
509 | ||
510 | cs_dbg(skt, 4, "insert\n"); | |
511 | ||
512 | if (!cs_socket_get(skt)) | |
513 | return CS_NO_CARD; | |
514 | ||
515 | ret = socket_setup(skt, setup_delay); | |
516 | if (ret == CS_SUCCESS) { | |
517 | skt->state |= SOCKET_PRESENT; | |
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 | cs_socket_put(skt); | |
530 | } | |
531 | ||
532 | return ret; | |
533 | } | |
534 | ||
535 | static int socket_suspend(struct pcmcia_socket *skt) | |
536 | { | |
537 | if (skt->state & SOCKET_SUSPEND) | |
538 | return CS_IN_USE; | |
539 | ||
540 | send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); | |
541 | skt->socket = dead_socket; | |
542 | skt->ops->set_socket(skt, &skt->socket); | |
543 | if (skt->ops->suspend) | |
544 | skt->ops->suspend(skt); | |
545 | skt->state |= SOCKET_SUSPEND; | |
546 | ||
547 | return CS_SUCCESS; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Resume a socket. If a card is present, verify its CIS against | |
552 | * our cached copy. If they are different, the card has been | |
553 | * replaced, and we need to tell the drivers. | |
554 | */ | |
555 | static int socket_resume(struct pcmcia_socket *skt) | |
556 | { | |
557 | int ret; | |
558 | ||
559 | if (!(skt->state & SOCKET_SUSPEND)) | |
560 | return CS_IN_USE; | |
561 | ||
562 | skt->socket = dead_socket; | |
563 | skt->ops->init(skt); | |
564 | skt->ops->set_socket(skt, &skt->socket); | |
565 | ||
566 | if (!(skt->state & SOCKET_PRESENT)) { | |
567 | skt->state &= ~SOCKET_SUSPEND; | |
568 | return socket_insert(skt); | |
569 | } | |
570 | ||
571 | ret = socket_setup(skt, resume_delay); | |
572 | if (ret == CS_SUCCESS) { | |
573 | /* | |
574 | * FIXME: need a better check here for cardbus cards. | |
575 | */ | |
576 | if (verify_cis_cache(skt) != 0) { | |
577 | cs_dbg(skt, 4, "cis mismatch - different card\n"); | |
578 | socket_remove_drivers(skt); | |
579 | destroy_cis_cache(skt); | |
580 | /* | |
581 | * Workaround: give DS time to schedule removal. | |
582 | * Remove me once the 100ms delay is eliminated | |
583 | * in ds.c | |
584 | */ | |
585 | msleep(200); | |
586 | send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
587 | } else { | |
588 | cs_dbg(skt, 4, "cis matches cache\n"); | |
589 | send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); | |
590 | } | |
591 | } else { | |
592 | socket_shutdown(skt); | |
593 | cs_socket_put(skt); | |
594 | } | |
595 | ||
596 | skt->state &= ~SOCKET_SUSPEND; | |
597 | ||
598 | return CS_SUCCESS; | |
599 | } | |
600 | ||
601 | static void socket_remove(struct pcmcia_socket *skt) | |
602 | { | |
603 | socket_shutdown(skt); | |
604 | cs_socket_put(skt); | |
605 | } | |
606 | ||
607 | /* | |
608 | * Process a socket card detect status change. | |
609 | * | |
610 | * If we don't have a card already present, delay the detect event for | |
611 | * about 20ms (to be on the safe side) before reading the socket status. | |
612 | * | |
613 | * Some i82365-based systems send multiple SS_DETECT events during card | |
614 | * insertion, and the "card present" status bit seems to bounce. This | |
615 | * will probably be true with GPIO-based card detection systems after | |
616 | * the product has aged. | |
617 | */ | |
618 | static void socket_detect_change(struct pcmcia_socket *skt) | |
619 | { | |
620 | if (!(skt->state & SOCKET_SUSPEND)) { | |
621 | int status; | |
622 | ||
623 | if (!(skt->state & SOCKET_PRESENT)) | |
624 | msleep(20); | |
625 | ||
626 | skt->ops->get_status(skt, &status); | |
627 | if ((skt->state & SOCKET_PRESENT) && | |
628 | !(status & SS_DETECT)) | |
629 | socket_remove(skt); | |
630 | if (!(skt->state & SOCKET_PRESENT) && | |
631 | (status & SS_DETECT)) | |
632 | socket_insert(skt); | |
633 | } | |
634 | } | |
635 | ||
636 | static int pccardd(void *__skt) | |
637 | { | |
638 | struct pcmcia_socket *skt = __skt; | |
639 | DECLARE_WAITQUEUE(wait, current); | |
640 | int ret; | |
641 | ||
642 | daemonize("pccardd"); | |
643 | ||
644 | skt->thread = current; | |
645 | skt->socket = dead_socket; | |
646 | skt->ops->init(skt); | |
647 | skt->ops->set_socket(skt, &skt->socket); | |
648 | ||
649 | /* register with the device core */ | |
650 | ret = class_device_register(&skt->dev); | |
651 | if (ret) { | |
652 | printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n", | |
653 | skt); | |
654 | skt->thread = NULL; | |
655 | complete_and_exit(&skt->thread_done, 0); | |
656 | } | |
657 | complete(&skt->thread_done); | |
658 | ||
659 | add_wait_queue(&skt->thread_wait, &wait); | |
660 | for (;;) { | |
661 | unsigned long flags; | |
662 | unsigned int events; | |
663 | ||
664 | set_current_state(TASK_INTERRUPTIBLE); | |
665 | ||
666 | spin_lock_irqsave(&skt->thread_lock, flags); | |
667 | events = skt->thread_events; | |
668 | skt->thread_events = 0; | |
669 | spin_unlock_irqrestore(&skt->thread_lock, flags); | |
670 | ||
671 | if (events) { | |
672 | down(&skt->skt_sem); | |
673 | if (events & SS_DETECT) | |
674 | socket_detect_change(skt); | |
675 | if (events & SS_BATDEAD) | |
676 | send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); | |
677 | if (events & SS_BATWARN) | |
678 | send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); | |
679 | if (events & SS_READY) | |
680 | send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); | |
681 | up(&skt->skt_sem); | |
682 | continue; | |
683 | } | |
684 | ||
685 | schedule(); | |
3e1d1d28 | 686 | try_to_freeze(); |
1da177e4 LT |
687 | |
688 | if (!skt->thread) | |
689 | break; | |
690 | } | |
691 | remove_wait_queue(&skt->thread_wait, &wait); | |
692 | ||
693 | /* remove from the device core */ | |
694 | class_device_unregister(&skt->dev); | |
695 | ||
696 | complete_and_exit(&skt->thread_done, 0); | |
697 | } | |
698 | ||
699 | /* | |
700 | * Yenta (at least) probes interrupts before registering the socket and | |
701 | * starting the handler thread. | |
702 | */ | |
703 | void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) | |
704 | { | |
705 | cs_dbg(s, 4, "parse_events: events %08x\n", events); | |
706 | if (s->thread) { | |
707 | spin_lock(&s->thread_lock); | |
708 | s->thread_events |= events; | |
709 | spin_unlock(&s->thread_lock); | |
710 | ||
711 | wake_up(&s->thread_wait); | |
712 | } | |
713 | } /* pcmcia_parse_events */ | |
33519ddd | 714 | EXPORT_SYMBOL(pcmcia_parse_events); |
1da177e4 | 715 | |
1da177e4 LT |
716 | |
717 | /* register pcmcia_callback */ | |
718 | int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) | |
719 | { | |
720 | int ret = 0; | |
721 | ||
722 | /* s->skt_sem also protects s->callback */ | |
723 | down(&s->skt_sem); | |
724 | ||
725 | if (c) { | |
726 | /* registration */ | |
727 | if (s->callback) { | |
728 | ret = -EBUSY; | |
729 | goto err; | |
730 | } | |
731 | ||
732 | s->callback = c; | |
733 | ||
734 | if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) | |
735 | send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
736 | } else | |
737 | s->callback = NULL; | |
738 | err: | |
739 | up(&s->skt_sem); | |
740 | ||
741 | return ret; | |
742 | } | |
743 | EXPORT_SYMBOL(pccard_register_pcmcia); | |
744 | ||
1da177e4 | 745 | |
33519ddd DB |
746 | /* I'm not sure which "reset" function this is supposed to use, |
747 | * but for now, it uses the low-level interface's reset, not the | |
748 | * CIS register. | |
749 | */ | |
1da177e4 LT |
750 | |
751 | int pccard_reset_card(struct pcmcia_socket *skt) | |
752 | { | |
753 | int ret; | |
33519ddd | 754 | |
1da177e4 LT |
755 | cs_dbg(skt, 1, "resetting socket\n"); |
756 | ||
757 | down(&skt->skt_sem); | |
758 | do { | |
759 | if (!(skt->state & SOCKET_PRESENT)) { | |
760 | ret = CS_NO_CARD; | |
761 | break; | |
762 | } | |
763 | if (skt->state & SOCKET_SUSPEND) { | |
764 | ret = CS_IN_USE; | |
765 | break; | |
766 | } | |
767 | if (skt->state & SOCKET_CARDBUS) { | |
768 | ret = CS_UNSUPPORTED_FUNCTION; | |
769 | break; | |
770 | } | |
771 | ||
772 | ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); | |
773 | if (ret == 0) { | |
774 | send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); | |
775 | if (socket_reset(skt) == CS_SUCCESS) | |
776 | send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); | |
777 | } | |
778 | ||
779 | ret = CS_SUCCESS; | |
780 | } while (0); | |
781 | up(&skt->skt_sem); | |
782 | ||
783 | return ret; | |
784 | } /* reset_card */ | |
785 | EXPORT_SYMBOL(pccard_reset_card); | |
786 | ||
1da177e4 | 787 | |
33519ddd DB |
788 | /* These shut down or wake up a socket. They are sort of user |
789 | * initiated versions of the APM suspend and resume actions. | |
790 | */ | |
1da177e4 LT |
791 | int pcmcia_suspend_card(struct pcmcia_socket *skt) |
792 | { | |
793 | int ret; | |
33519ddd | 794 | |
1da177e4 LT |
795 | cs_dbg(skt, 1, "suspending socket\n"); |
796 | ||
797 | down(&skt->skt_sem); | |
798 | do { | |
799 | if (!(skt->state & SOCKET_PRESENT)) { | |
800 | ret = CS_NO_CARD; | |
801 | break; | |
802 | } | |
803 | if (skt->state & SOCKET_CARDBUS) { | |
804 | ret = CS_UNSUPPORTED_FUNCTION; | |
805 | break; | |
806 | } | |
807 | ret = socket_suspend(skt); | |
808 | } while (0); | |
809 | up(&skt->skt_sem); | |
810 | ||
811 | return ret; | |
812 | } /* suspend_card */ | |
33519ddd DB |
813 | EXPORT_SYMBOL(pcmcia_suspend_card); |
814 | ||
1da177e4 LT |
815 | |
816 | int pcmcia_resume_card(struct pcmcia_socket *skt) | |
817 | { | |
818 | int ret; | |
819 | ||
820 | cs_dbg(skt, 1, "waking up socket\n"); | |
821 | ||
822 | down(&skt->skt_sem); | |
823 | do { | |
824 | if (!(skt->state & SOCKET_PRESENT)) { | |
825 | ret = CS_NO_CARD; | |
826 | break; | |
827 | } | |
828 | if (skt->state & SOCKET_CARDBUS) { | |
829 | ret = CS_UNSUPPORTED_FUNCTION; | |
830 | break; | |
831 | } | |
832 | ret = socket_resume(skt); | |
833 | } while (0); | |
834 | up(&skt->skt_sem); | |
835 | ||
836 | return ret; | |
837 | } /* resume_card */ | |
33519ddd | 838 | EXPORT_SYMBOL(pcmcia_resume_card); |
1da177e4 | 839 | |
1da177e4 | 840 | |
33519ddd | 841 | /* These handle user requests to eject or insert a card. */ |
1da177e4 LT |
842 | int pcmcia_eject_card(struct pcmcia_socket *skt) |
843 | { | |
844 | int ret; | |
845 | ||
846 | cs_dbg(skt, 1, "user eject request\n"); | |
847 | ||
848 | down(&skt->skt_sem); | |
849 | do { | |
850 | if (!(skt->state & SOCKET_PRESENT)) { | |
851 | ret = -ENODEV; | |
852 | break; | |
853 | } | |
854 | ||
855 | ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); | |
856 | if (ret != 0) { | |
857 | ret = -EINVAL; | |
858 | break; | |
859 | } | |
860 | ||
861 | socket_remove(skt); | |
862 | ret = 0; | |
863 | } while (0); | |
864 | up(&skt->skt_sem); | |
865 | ||
866 | return ret; | |
867 | } /* eject_card */ | |
33519ddd DB |
868 | EXPORT_SYMBOL(pcmcia_eject_card); |
869 | ||
1da177e4 LT |
870 | |
871 | int pcmcia_insert_card(struct pcmcia_socket *skt) | |
872 | { | |
873 | int ret; | |
874 | ||
875 | cs_dbg(skt, 1, "user insert request\n"); | |
876 | ||
877 | down(&skt->skt_sem); | |
878 | do { | |
879 | if (skt->state & SOCKET_PRESENT) { | |
880 | ret = -EBUSY; | |
881 | break; | |
882 | } | |
883 | if (socket_insert(skt) == CS_NO_CARD) { | |
884 | ret = -ENODEV; | |
885 | break; | |
886 | } | |
887 | ret = 0; | |
888 | } while (0); | |
889 | up(&skt->skt_sem); | |
890 | ||
891 | return ret; | |
892 | } /* insert_card */ | |
33519ddd DB |
893 | EXPORT_SYMBOL(pcmcia_insert_card); |
894 | ||
1da177e4 | 895 | |
3ee13937 DB |
896 | static int pcmcia_socket_hotplug(struct class_device *dev, char **envp, |
897 | int num_envp, char *buffer, int buffer_size) | |
898 | { | |
899 | struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); | |
900 | int i = 0, length = 0; | |
901 | ||
902 | if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
903 | &length, "SOCKET_NO=%u", s->sock)) | |
904 | return -ENOMEM; | |
905 | ||
906 | envp[i] = NULL; | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
1da177e4 | 911 | |
378a33a6 DB |
912 | static struct completion pcmcia_unload; |
913 | ||
914 | static void pcmcia_release_socket_class(struct class *data) | |
915 | { | |
916 | complete(&pcmcia_unload); | |
917 | } | |
918 | ||
919 | ||
1da177e4 LT |
920 | struct class pcmcia_socket_class = { |
921 | .name = "pcmcia_socket", | |
3ee13937 | 922 | .hotplug = pcmcia_socket_hotplug, |
1da177e4 | 923 | .release = pcmcia_release_socket, |
378a33a6 | 924 | .class_release = pcmcia_release_socket_class, |
1da177e4 LT |
925 | }; |
926 | EXPORT_SYMBOL(pcmcia_socket_class); | |
927 | ||
928 | ||
929 | static int __init init_pcmcia_cs(void) | |
930 | { | |
378a33a6 DB |
931 | int ret; |
932 | ||
933 | init_completion(&pcmcia_unload); | |
934 | ret = class_register(&pcmcia_socket_class); | |
1da177e4 LT |
935 | if (ret) |
936 | return (ret); | |
937 | return class_interface_register(&pccard_sysfs_interface); | |
938 | } | |
939 | ||
940 | static void __exit exit_pcmcia_cs(void) | |
941 | { | |
33519ddd DB |
942 | class_interface_unregister(&pccard_sysfs_interface); |
943 | class_unregister(&pcmcia_socket_class); | |
378a33a6 DB |
944 | |
945 | wait_for_completion(&pcmcia_unload); | |
1da177e4 LT |
946 | } |
947 | ||
948 | subsys_initcall(init_pcmcia_cs); | |
949 | module_exit(exit_pcmcia_cs); | |
950 |