Commit | Line | Data |
---|---|---|
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 | |
36 | #include <pcmcia/version.h> | |
37 | #include <pcmcia/cs_types.h> | |
38 | #include <pcmcia/ss.h> | |
39 | #include <pcmcia/cs.h> | |
40 | #include <pcmcia/bulkmem.h> | |
41 | #include <pcmcia/cistpl.h> | |
42 | #include <pcmcia/cisreg.h> | |
43 | #include <pcmcia/ds.h> | |
44 | #include "cs_internal.h" | |
45 | ||
1da177e4 LT |
46 | |
47 | /* Module parameters */ | |
48 | ||
49 | MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>"); | |
33519ddd | 50 | MODULE_DESCRIPTION("Linux Kernel Card Services"); |
1da177e4 LT |
51 | MODULE_LICENSE("GPL"); |
52 | ||
53 | #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) | |
54 | ||
55 | INT_MODULE_PARM(setup_delay, 10); /* centiseconds */ | |
56 | INT_MODULE_PARM(resume_delay, 20); /* centiseconds */ | |
57 | INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */ | |
58 | INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */ | |
59 | INT_MODULE_PARM(reset_time, 10); /* usecs */ | |
60 | INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */ | |
61 | INT_MODULE_PARM(unreset_check, 10); /* centiseconds */ | |
62 | INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */ | |
63 | ||
64 | /* Access speed for attribute memory windows */ | |
65 | INT_MODULE_PARM(cis_speed, 300); /* ns */ | |
66 | ||
1da177e4 LT |
67 | #ifdef DEBUG |
68 | static int pc_debug; | |
69 | ||
70 | module_param(pc_debug, int, 0644); | |
71 | ||
72 | int cs_debug_level(int level) | |
73 | { | |
74 | return pc_debug > level; | |
75 | } | |
76 | #endif | |
77 | ||
1da177e4 LT |
78 | |
79 | socket_state_t dead_socket = { | |
80 | .csc_mask = SS_DETECT, | |
81 | }; | |
33519ddd | 82 | EXPORT_SYMBOL(dead_socket); |
1da177e4 LT |
83 | |
84 | ||
85 | /* List of all sockets, protected by a rwsem */ | |
86 | LIST_HEAD(pcmcia_socket_list); | |
1da177e4 | 87 | EXPORT_SYMBOL(pcmcia_socket_list); |
1da177e4 | 88 | |
33519ddd DB |
89 | DECLARE_RWSEM(pcmcia_socket_list_rwsem); |
90 | EXPORT_SYMBOL(pcmcia_socket_list_rwsem); | |
1da177e4 | 91 | |
1da177e4 LT |
92 | |
93 | /** | |
33519ddd DB |
94 | * Low-level PCMCIA socket drivers need to register with the PCCard |
95 | * core using pcmcia_register_socket. | |
96 | * | |
97 | * socket drivers are expected to use the following callbacks in their | |
1da177e4 LT |
98 | * .drv struct: |
99 | * - pcmcia_socket_dev_suspend | |
100 | * - pcmcia_socket_dev_resume | |
101 | * These functions check for the appropriate struct pcmcia_soket arrays, | |
102 | * and pass them to the low-level functions pcmcia_{suspend,resume}_socket | |
103 | */ | |
104 | static int socket_resume(struct pcmcia_socket *skt); | |
105 | static int socket_suspend(struct pcmcia_socket *skt); | |
106 | ||
107 | int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state) | |
108 | { | |
109 | struct pcmcia_socket *socket; | |
110 | ||
111 | down_read(&pcmcia_socket_list_rwsem); | |
112 | list_for_each_entry(socket, &pcmcia_socket_list, socket_list) { | |
113 | if (socket->dev.dev != dev) | |
114 | continue; | |
115 | down(&socket->skt_sem); | |
116 | socket_suspend(socket); | |
117 | up(&socket->skt_sem); | |
118 | } | |
119 | up_read(&pcmcia_socket_list_rwsem); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | EXPORT_SYMBOL(pcmcia_socket_dev_suspend); | |
124 | ||
125 | int pcmcia_socket_dev_resume(struct device *dev) | |
126 | { | |
127 | struct pcmcia_socket *socket; | |
128 | ||
129 | down_read(&pcmcia_socket_list_rwsem); | |
130 | list_for_each_entry(socket, &pcmcia_socket_list, socket_list) { | |
131 | if (socket->dev.dev != dev) | |
132 | continue; | |
133 | down(&socket->skt_sem); | |
134 | socket_resume(socket); | |
135 | up(&socket->skt_sem); | |
136 | } | |
137 | up_read(&pcmcia_socket_list_rwsem); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | EXPORT_SYMBOL(pcmcia_socket_dev_resume); | |
142 | ||
143 | ||
144 | struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt) | |
145 | { | |
146 | struct class_device *cl_dev = class_device_get(&skt->dev); | |
147 | if (!cl_dev) | |
148 | return NULL; | |
149 | skt = class_get_devdata(cl_dev); | |
150 | if (!try_module_get(skt->owner)) { | |
151 | class_device_put(&skt->dev); | |
152 | return NULL; | |
153 | } | |
154 | return (skt); | |
155 | } | |
156 | EXPORT_SYMBOL(pcmcia_get_socket); | |
157 | ||
158 | ||
159 | void pcmcia_put_socket(struct pcmcia_socket *skt) | |
160 | { | |
161 | module_put(skt->owner); | |
162 | class_device_put(&skt->dev); | |
163 | } | |
164 | EXPORT_SYMBOL(pcmcia_put_socket); | |
165 | ||
166 | ||
167 | static void pcmcia_release_socket(struct class_device *class_dev) | |
168 | { | |
169 | struct pcmcia_socket *socket = class_get_devdata(class_dev); | |
170 | ||
171 | complete(&socket->socket_released); | |
172 | } | |
173 | ||
174 | static int pccardd(void *__skt); | |
175 | ||
176 | /** | |
177 | * pcmcia_register_socket - add a new pcmcia socket device | |
178 | */ | |
179 | int pcmcia_register_socket(struct pcmcia_socket *socket) | |
180 | { | |
181 | int ret; | |
182 | ||
183 | if (!socket || !socket->ops || !socket->dev.dev || !socket->resource_ops) | |
184 | return -EINVAL; | |
185 | ||
186 | cs_dbg(socket, 0, "pcmcia_register_socket(0x%p)\n", socket->ops); | |
187 | ||
188 | spin_lock_init(&socket->lock); | |
189 | ||
190 | if (socket->resource_ops->init) { | |
191 | ret = socket->resource_ops->init(socket); | |
192 | if (ret) | |
193 | return (ret); | |
194 | } | |
195 | ||
196 | /* try to obtain a socket number [yes, it gets ugly if we | |
33519ddd DB |
197 | * register more than 2^sizeof(unsigned int) pcmcia |
198 | * sockets... but the socket number is deprecated | |
1da177e4 LT |
199 | * anyways, so I don't care] */ |
200 | down_write(&pcmcia_socket_list_rwsem); | |
201 | if (list_empty(&pcmcia_socket_list)) | |
202 | socket->sock = 0; | |
203 | else { | |
204 | unsigned int found, i = 1; | |
205 | struct pcmcia_socket *tmp; | |
206 | do { | |
207 | found = 1; | |
208 | list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { | |
209 | if (tmp->sock == i) | |
210 | found = 0; | |
211 | } | |
212 | i++; | |
213 | } while (!found); | |
214 | socket->sock = i - 1; | |
215 | } | |
216 | list_add_tail(&socket->socket_list, &pcmcia_socket_list); | |
217 | up_write(&pcmcia_socket_list_rwsem); | |
218 | ||
219 | ||
220 | /* set proper values in socket->dev */ | |
221 | socket->dev.class_data = socket; | |
222 | socket->dev.class = &pcmcia_socket_class; | |
223 | snprintf(socket->dev.class_id, BUS_ID_SIZE, "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 | init_waitqueue_head(&socket->thread_wait); | |
234 | init_MUTEX(&socket->skt_sem); | |
235 | spin_lock_init(&socket->thread_lock); | |
236 | ||
237 | ret = kernel_thread(pccardd, socket, CLONE_KERNEL); | |
238 | if (ret < 0) | |
239 | goto err; | |
240 | ||
241 | wait_for_completion(&socket->thread_done); | |
242 | if(!socket->thread) { | |
243 | printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket); | |
244 | return -EIO; | |
245 | } | |
246 | pcmcia_parse_events(socket, SS_DETECT); | |
247 | ||
248 | return 0; | |
249 | ||
250 | err: | |
251 | down_write(&pcmcia_socket_list_rwsem); | |
252 | list_del(&socket->socket_list); | |
253 | up_write(&pcmcia_socket_list_rwsem); | |
254 | return ret; | |
255 | } /* pcmcia_register_socket */ | |
256 | EXPORT_SYMBOL(pcmcia_register_socket); | |
257 | ||
258 | ||
259 | /** | |
260 | * pcmcia_unregister_socket - remove a pcmcia socket device | |
261 | */ | |
262 | void pcmcia_unregister_socket(struct pcmcia_socket *socket) | |
263 | { | |
264 | if (!socket) | |
265 | return; | |
266 | ||
267 | cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops); | |
268 | ||
269 | if (socket->thread) { | |
270 | init_completion(&socket->thread_done); | |
271 | socket->thread = NULL; | |
272 | wake_up(&socket->thread_wait); | |
273 | wait_for_completion(&socket->thread_done); | |
274 | } | |
275 | release_cis_mem(socket); | |
276 | ||
277 | /* remove from our own list */ | |
278 | down_write(&pcmcia_socket_list_rwsem); | |
279 | list_del(&socket->socket_list); | |
280 | up_write(&pcmcia_socket_list_rwsem); | |
281 | ||
282 | /* wait for sysfs to drop all references */ | |
283 | release_resource_db(socket); | |
284 | wait_for_completion(&socket->socket_released); | |
285 | } /* pcmcia_unregister_socket */ | |
286 | EXPORT_SYMBOL(pcmcia_unregister_socket); | |
287 | ||
288 | ||
289 | struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr) | |
290 | { | |
291 | struct pcmcia_socket *s; | |
292 | ||
293 | down_read(&pcmcia_socket_list_rwsem); | |
294 | list_for_each_entry(s, &pcmcia_socket_list, socket_list) | |
295 | if (s->sock == nr) { | |
296 | up_read(&pcmcia_socket_list_rwsem); | |
297 | return s; | |
298 | } | |
299 | up_read(&pcmcia_socket_list_rwsem); | |
300 | ||
301 | return NULL; | |
302 | ||
303 | } | |
304 | EXPORT_SYMBOL(pcmcia_get_socket_by_nr); | |
305 | ||
306 | ||
33519ddd DB |
307 | /** |
308 | * socket_setup() and shutdown_socket() are called by the main event | |
309 | * handler when card insertion and removal events are received. | |
310 | * socket_setup() turns on socket power and resets the socket, in two stages. | |
311 | * shutdown_socket() unconfigures a socket and turns off socket power. | |
312 | */ | |
1da177e4 LT |
313 | static void shutdown_socket(struct pcmcia_socket *s) |
314 | { | |
33519ddd DB |
315 | cs_dbg(s, 1, "shutdown_socket\n"); |
316 | ||
317 | /* Blank out the socket state */ | |
318 | s->socket = dead_socket; | |
319 | s->ops->init(s); | |
320 | s->ops->set_socket(s, &s->socket); | |
321 | s->irq.AssignedIRQ = s->irq.Config = 0; | |
322 | s->lock_count = 0; | |
323 | destroy_cis_cache(s); | |
1da177e4 | 324 | #ifdef CONFIG_CARDBUS |
33519ddd | 325 | cb_free(s); |
1da177e4 | 326 | #endif |
33519ddd DB |
327 | s->functions = 0; |
328 | if (s->config) { | |
329 | kfree(s->config); | |
330 | s->config = NULL; | |
1da177e4 | 331 | } |
1da177e4 | 332 | |
33519ddd DB |
333 | { |
334 | int status; | |
335 | s->ops->get_status(s, &status); | |
336 | if (status & SS_POWERON) { | |
337 | printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s); | |
338 | } | |
339 | } | |
340 | } /* shutdown_socket */ | |
1da177e4 | 341 | |
1da177e4 | 342 | |
33519ddd DB |
343 | /** |
344 | * The central event handler. Send_event() sends an event to the | |
345 | * 16-bit subsystem, which then calls the relevant device drivers. | |
346 | * Parse_events() interprets the event bits from | |
347 | * a card status change report. Do_shutdown() handles the high | |
348 | * priority stuff associated with a card removal. | |
349 | */ | |
1da177e4 LT |
350 | |
351 | /* NOTE: send_event needs to be called with skt->sem held. */ | |
352 | ||
353 | static int send_event(struct pcmcia_socket *s, event_t event, int priority) | |
354 | { | |
355 | int ret; | |
356 | ||
357 | if (s->state & SOCKET_CARDBUS) | |
358 | return 0; | |
359 | ||
360 | cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n", | |
361 | event, priority, s->callback); | |
362 | ||
363 | if (!s->callback) | |
364 | return 0; | |
365 | if (!try_module_get(s->callback->owner)) | |
366 | return 0; | |
367 | ||
368 | ret = s->callback->event(s, event, priority); | |
369 | ||
370 | module_put(s->callback->owner); | |
371 | ||
372 | return ret; | |
373 | } | |
374 | ||
375 | static void socket_remove_drivers(struct pcmcia_socket *skt) | |
376 | { | |
377 | cs_dbg(skt, 4, "remove_drivers\n"); | |
378 | ||
379 | send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH); | |
380 | } | |
381 | ||
382 | static void socket_shutdown(struct pcmcia_socket *skt) | |
383 | { | |
384 | cs_dbg(skt, 4, "shutdown\n"); | |
385 | ||
386 | socket_remove_drivers(skt); | |
387 | skt->state &= SOCKET_INUSE|SOCKET_PRESENT; | |
388 | msleep(shutdown_delay * 10); | |
389 | skt->state &= SOCKET_INUSE; | |
390 | shutdown_socket(skt); | |
391 | } | |
392 | ||
393 | static int socket_reset(struct pcmcia_socket *skt) | |
394 | { | |
395 | int status, i; | |
396 | ||
397 | cs_dbg(skt, 4, "reset\n"); | |
398 | ||
399 | skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; | |
400 | skt->ops->set_socket(skt, &skt->socket); | |
401 | udelay((long)reset_time); | |
402 | ||
403 | skt->socket.flags &= ~SS_RESET; | |
404 | skt->ops->set_socket(skt, &skt->socket); | |
405 | ||
406 | msleep(unreset_delay * 10); | |
407 | for (i = 0; i < unreset_limit; i++) { | |
408 | skt->ops->get_status(skt, &status); | |
409 | ||
410 | if (!(status & SS_DETECT)) | |
411 | return CS_NO_CARD; | |
412 | ||
413 | if (status & SS_READY) | |
414 | return CS_SUCCESS; | |
415 | ||
416 | msleep(unreset_check * 10); | |
417 | } | |
418 | ||
419 | cs_err(skt, "time out after reset.\n"); | |
420 | return CS_GENERAL_FAILURE; | |
421 | } | |
422 | ||
423 | static int socket_setup(struct pcmcia_socket *skt, int initial_delay) | |
424 | { | |
425 | int status, i; | |
426 | ||
427 | cs_dbg(skt, 4, "setup\n"); | |
428 | ||
429 | skt->ops->get_status(skt, &status); | |
430 | if (!(status & SS_DETECT)) | |
431 | return CS_NO_CARD; | |
432 | ||
433 | msleep(initial_delay * 10); | |
434 | ||
435 | for (i = 0; i < 100; i++) { | |
436 | skt->ops->get_status(skt, &status); | |
437 | if (!(status & SS_DETECT)) | |
438 | return CS_NO_CARD; | |
439 | ||
440 | if (!(status & SS_PENDING)) | |
441 | break; | |
442 | ||
443 | msleep(100); | |
444 | } | |
445 | ||
446 | if (status & SS_PENDING) { | |
447 | cs_err(skt, "voltage interrogation timed out.\n"); | |
448 | return CS_GENERAL_FAILURE; | |
449 | } | |
450 | ||
451 | if (status & SS_CARDBUS) { | |
452 | skt->state |= SOCKET_CARDBUS; | |
453 | #ifndef CONFIG_CARDBUS | |
454 | cs_err(skt, "cardbus cards are not supported.\n"); | |
455 | return CS_BAD_TYPE; | |
456 | #endif | |
457 | } | |
458 | ||
459 | /* | |
460 | * Decode the card voltage requirements, and apply power to the card. | |
461 | */ | |
462 | if (status & SS_3VCARD) | |
463 | skt->socket.Vcc = skt->socket.Vpp = 33; | |
464 | else if (!(status & SS_XVCARD)) | |
465 | skt->socket.Vcc = skt->socket.Vpp = 50; | |
466 | else { | |
467 | cs_err(skt, "unsupported voltage key.\n"); | |
468 | return CS_BAD_TYPE; | |
469 | } | |
fa912bcb DR |
470 | |
471 | if (skt->power_hook) | |
472 | skt->power_hook(skt, HOOK_POWER_PRE); | |
473 | ||
1da177e4 LT |
474 | skt->socket.flags = 0; |
475 | skt->ops->set_socket(skt, &skt->socket); | |
476 | ||
477 | /* | |
478 | * Wait "vcc_settle" for the supply to stabilise. | |
479 | */ | |
480 | msleep(vcc_settle * 10); | |
481 | ||
482 | skt->ops->get_status(skt, &status); | |
483 | if (!(status & SS_POWERON)) { | |
484 | cs_err(skt, "unable to apply power.\n"); | |
485 | return CS_BAD_TYPE; | |
486 | } | |
487 | ||
fa912bcb DR |
488 | status = socket_reset(skt); |
489 | ||
490 | if (skt->power_hook) | |
491 | skt->power_hook(skt, HOOK_POWER_POST); | |
492 | ||
493 | return status; | |
1da177e4 LT |
494 | } |
495 | ||
496 | /* | |
497 | * Handle card insertion. Setup the socket, reset the card, | |
498 | * and then tell the rest of PCMCIA that a card is present. | |
499 | */ | |
500 | static int socket_insert(struct pcmcia_socket *skt) | |
501 | { | |
502 | int ret; | |
503 | ||
504 | cs_dbg(skt, 4, "insert\n"); | |
505 | ||
506 | if (!cs_socket_get(skt)) | |
507 | return CS_NO_CARD; | |
508 | ||
509 | ret = socket_setup(skt, setup_delay); | |
510 | if (ret == CS_SUCCESS) { | |
511 | skt->state |= SOCKET_PRESENT; | |
512 | #ifdef CONFIG_CARDBUS | |
513 | if (skt->state & SOCKET_CARDBUS) { | |
514 | cb_alloc(skt); | |
515 | skt->state |= SOCKET_CARDBUS_CONFIG; | |
516 | } | |
517 | #endif | |
518 | cs_dbg(skt, 4, "insert done\n"); | |
519 | ||
520 | send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
521 | } else { | |
522 | socket_shutdown(skt); | |
523 | cs_socket_put(skt); | |
524 | } | |
525 | ||
526 | return ret; | |
527 | } | |
528 | ||
529 | static int socket_suspend(struct pcmcia_socket *skt) | |
530 | { | |
531 | if (skt->state & SOCKET_SUSPEND) | |
532 | return CS_IN_USE; | |
533 | ||
534 | send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); | |
535 | skt->socket = dead_socket; | |
536 | skt->ops->set_socket(skt, &skt->socket); | |
537 | if (skt->ops->suspend) | |
538 | skt->ops->suspend(skt); | |
539 | skt->state |= SOCKET_SUSPEND; | |
540 | ||
541 | return CS_SUCCESS; | |
542 | } | |
543 | ||
544 | /* | |
545 | * Resume a socket. If a card is present, verify its CIS against | |
546 | * our cached copy. If they are different, the card has been | |
547 | * replaced, and we need to tell the drivers. | |
548 | */ | |
549 | static int socket_resume(struct pcmcia_socket *skt) | |
550 | { | |
551 | int ret; | |
552 | ||
553 | if (!(skt->state & SOCKET_SUSPEND)) | |
554 | return CS_IN_USE; | |
555 | ||
556 | skt->socket = dead_socket; | |
557 | skt->ops->init(skt); | |
558 | skt->ops->set_socket(skt, &skt->socket); | |
559 | ||
560 | if (!(skt->state & SOCKET_PRESENT)) { | |
561 | skt->state &= ~SOCKET_SUSPEND; | |
562 | return socket_insert(skt); | |
563 | } | |
564 | ||
565 | ret = socket_setup(skt, resume_delay); | |
566 | if (ret == CS_SUCCESS) { | |
567 | /* | |
568 | * FIXME: need a better check here for cardbus cards. | |
569 | */ | |
570 | if (verify_cis_cache(skt) != 0) { | |
571 | cs_dbg(skt, 4, "cis mismatch - different card\n"); | |
572 | socket_remove_drivers(skt); | |
573 | destroy_cis_cache(skt); | |
574 | /* | |
575 | * Workaround: give DS time to schedule removal. | |
576 | * Remove me once the 100ms delay is eliminated | |
577 | * in ds.c | |
578 | */ | |
579 | msleep(200); | |
580 | send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
581 | } else { | |
582 | cs_dbg(skt, 4, "cis matches cache\n"); | |
583 | send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); | |
584 | } | |
585 | } else { | |
586 | socket_shutdown(skt); | |
587 | cs_socket_put(skt); | |
588 | } | |
589 | ||
590 | skt->state &= ~SOCKET_SUSPEND; | |
591 | ||
592 | return CS_SUCCESS; | |
593 | } | |
594 | ||
595 | static void socket_remove(struct pcmcia_socket *skt) | |
596 | { | |
597 | socket_shutdown(skt); | |
598 | cs_socket_put(skt); | |
599 | } | |
600 | ||
601 | /* | |
602 | * Process a socket card detect status change. | |
603 | * | |
604 | * If we don't have a card already present, delay the detect event for | |
605 | * about 20ms (to be on the safe side) before reading the socket status. | |
606 | * | |
607 | * Some i82365-based systems send multiple SS_DETECT events during card | |
608 | * insertion, and the "card present" status bit seems to bounce. This | |
609 | * will probably be true with GPIO-based card detection systems after | |
610 | * the product has aged. | |
611 | */ | |
612 | static void socket_detect_change(struct pcmcia_socket *skt) | |
613 | { | |
614 | if (!(skt->state & SOCKET_SUSPEND)) { | |
615 | int status; | |
616 | ||
617 | if (!(skt->state & SOCKET_PRESENT)) | |
618 | msleep(20); | |
619 | ||
620 | skt->ops->get_status(skt, &status); | |
621 | if ((skt->state & SOCKET_PRESENT) && | |
622 | !(status & SS_DETECT)) | |
623 | socket_remove(skt); | |
624 | if (!(skt->state & SOCKET_PRESENT) && | |
625 | (status & SS_DETECT)) | |
626 | socket_insert(skt); | |
627 | } | |
628 | } | |
629 | ||
630 | static int pccardd(void *__skt) | |
631 | { | |
632 | struct pcmcia_socket *skt = __skt; | |
633 | DECLARE_WAITQUEUE(wait, current); | |
634 | int ret; | |
635 | ||
636 | daemonize("pccardd"); | |
637 | ||
638 | skt->thread = current; | |
639 | skt->socket = dead_socket; | |
640 | skt->ops->init(skt); | |
641 | skt->ops->set_socket(skt, &skt->socket); | |
642 | ||
643 | /* register with the device core */ | |
644 | ret = class_device_register(&skt->dev); | |
645 | if (ret) { | |
646 | printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n", | |
647 | skt); | |
648 | skt->thread = NULL; | |
649 | complete_and_exit(&skt->thread_done, 0); | |
650 | } | |
651 | complete(&skt->thread_done); | |
652 | ||
653 | add_wait_queue(&skt->thread_wait, &wait); | |
654 | for (;;) { | |
655 | unsigned long flags; | |
656 | unsigned int events; | |
657 | ||
658 | set_current_state(TASK_INTERRUPTIBLE); | |
659 | ||
660 | spin_lock_irqsave(&skt->thread_lock, flags); | |
661 | events = skt->thread_events; | |
662 | skt->thread_events = 0; | |
663 | spin_unlock_irqrestore(&skt->thread_lock, flags); | |
664 | ||
665 | if (events) { | |
666 | down(&skt->skt_sem); | |
667 | if (events & SS_DETECT) | |
668 | socket_detect_change(skt); | |
669 | if (events & SS_BATDEAD) | |
670 | send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); | |
671 | if (events & SS_BATWARN) | |
672 | send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); | |
673 | if (events & SS_READY) | |
674 | send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); | |
675 | up(&skt->skt_sem); | |
676 | continue; | |
677 | } | |
678 | ||
679 | schedule(); | |
3e1d1d28 | 680 | try_to_freeze(); |
1da177e4 LT |
681 | |
682 | if (!skt->thread) | |
683 | break; | |
684 | } | |
685 | remove_wait_queue(&skt->thread_wait, &wait); | |
686 | ||
687 | /* remove from the device core */ | |
688 | class_device_unregister(&skt->dev); | |
689 | ||
690 | complete_and_exit(&skt->thread_done, 0); | |
691 | } | |
692 | ||
693 | /* | |
694 | * Yenta (at least) probes interrupts before registering the socket and | |
695 | * starting the handler thread. | |
696 | */ | |
697 | void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) | |
698 | { | |
699 | cs_dbg(s, 4, "parse_events: events %08x\n", events); | |
700 | if (s->thread) { | |
701 | spin_lock(&s->thread_lock); | |
702 | s->thread_events |= events; | |
703 | spin_unlock(&s->thread_lock); | |
704 | ||
705 | wake_up(&s->thread_wait); | |
706 | } | |
707 | } /* pcmcia_parse_events */ | |
33519ddd | 708 | EXPORT_SYMBOL(pcmcia_parse_events); |
1da177e4 | 709 | |
1da177e4 LT |
710 | |
711 | /* register pcmcia_callback */ | |
712 | int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) | |
713 | { | |
714 | int ret = 0; | |
715 | ||
716 | /* s->skt_sem also protects s->callback */ | |
717 | down(&s->skt_sem); | |
718 | ||
719 | if (c) { | |
720 | /* registration */ | |
721 | if (s->callback) { | |
722 | ret = -EBUSY; | |
723 | goto err; | |
724 | } | |
725 | ||
726 | s->callback = c; | |
727 | ||
728 | if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) | |
729 | send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); | |
730 | } else | |
731 | s->callback = NULL; | |
732 | err: | |
733 | up(&s->skt_sem); | |
734 | ||
735 | return ret; | |
736 | } | |
737 | EXPORT_SYMBOL(pccard_register_pcmcia); | |
738 | ||
1da177e4 | 739 | |
33519ddd DB |
740 | /* I'm not sure which "reset" function this is supposed to use, |
741 | * but for now, it uses the low-level interface's reset, not the | |
742 | * CIS register. | |
743 | */ | |
1da177e4 LT |
744 | |
745 | int pccard_reset_card(struct pcmcia_socket *skt) | |
746 | { | |
747 | int ret; | |
33519ddd | 748 | |
1da177e4 LT |
749 | cs_dbg(skt, 1, "resetting socket\n"); |
750 | ||
751 | down(&skt->skt_sem); | |
752 | do { | |
753 | if (!(skt->state & SOCKET_PRESENT)) { | |
754 | ret = CS_NO_CARD; | |
755 | break; | |
756 | } | |
757 | if (skt->state & SOCKET_SUSPEND) { | |
758 | ret = CS_IN_USE; | |
759 | break; | |
760 | } | |
761 | if (skt->state & SOCKET_CARDBUS) { | |
762 | ret = CS_UNSUPPORTED_FUNCTION; | |
763 | break; | |
764 | } | |
765 | ||
766 | ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); | |
767 | if (ret == 0) { | |
768 | send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); | |
769 | if (socket_reset(skt) == CS_SUCCESS) | |
770 | send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); | |
771 | } | |
772 | ||
773 | ret = CS_SUCCESS; | |
774 | } while (0); | |
775 | up(&skt->skt_sem); | |
776 | ||
777 | return ret; | |
778 | } /* reset_card */ | |
779 | EXPORT_SYMBOL(pccard_reset_card); | |
780 | ||
1da177e4 | 781 | |
33519ddd DB |
782 | /* These shut down or wake up a socket. They are sort of user |
783 | * initiated versions of the APM suspend and resume actions. | |
784 | */ | |
1da177e4 LT |
785 | int pcmcia_suspend_card(struct pcmcia_socket *skt) |
786 | { | |
787 | int ret; | |
33519ddd | 788 | |
1da177e4 LT |
789 | cs_dbg(skt, 1, "suspending socket\n"); |
790 | ||
791 | down(&skt->skt_sem); | |
792 | do { | |
793 | if (!(skt->state & SOCKET_PRESENT)) { | |
794 | ret = CS_NO_CARD; | |
795 | break; | |
796 | } | |
797 | if (skt->state & SOCKET_CARDBUS) { | |
798 | ret = CS_UNSUPPORTED_FUNCTION; | |
799 | break; | |
800 | } | |
801 | ret = socket_suspend(skt); | |
802 | } while (0); | |
803 | up(&skt->skt_sem); | |
804 | ||
805 | return ret; | |
806 | } /* suspend_card */ | |
33519ddd DB |
807 | EXPORT_SYMBOL(pcmcia_suspend_card); |
808 | ||
1da177e4 LT |
809 | |
810 | int pcmcia_resume_card(struct pcmcia_socket *skt) | |
811 | { | |
812 | int ret; | |
813 | ||
814 | cs_dbg(skt, 1, "waking up socket\n"); | |
815 | ||
816 | down(&skt->skt_sem); | |
817 | do { | |
818 | if (!(skt->state & SOCKET_PRESENT)) { | |
819 | ret = CS_NO_CARD; | |
820 | break; | |
821 | } | |
822 | if (skt->state & SOCKET_CARDBUS) { | |
823 | ret = CS_UNSUPPORTED_FUNCTION; | |
824 | break; | |
825 | } | |
826 | ret = socket_resume(skt); | |
827 | } while (0); | |
828 | up(&skt->skt_sem); | |
829 | ||
830 | return ret; | |
831 | } /* resume_card */ | |
33519ddd | 832 | EXPORT_SYMBOL(pcmcia_resume_card); |
1da177e4 | 833 | |
1da177e4 | 834 | |
33519ddd | 835 | /* These handle user requests to eject or insert a card. */ |
1da177e4 LT |
836 | int pcmcia_eject_card(struct pcmcia_socket *skt) |
837 | { | |
838 | int ret; | |
839 | ||
840 | cs_dbg(skt, 1, "user eject request\n"); | |
841 | ||
842 | down(&skt->skt_sem); | |
843 | do { | |
844 | if (!(skt->state & SOCKET_PRESENT)) { | |
845 | ret = -ENODEV; | |
846 | break; | |
847 | } | |
848 | ||
849 | ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); | |
850 | if (ret != 0) { | |
851 | ret = -EINVAL; | |
852 | break; | |
853 | } | |
854 | ||
855 | socket_remove(skt); | |
856 | ret = 0; | |
857 | } while (0); | |
858 | up(&skt->skt_sem); | |
859 | ||
860 | return ret; | |
861 | } /* eject_card */ | |
33519ddd DB |
862 | EXPORT_SYMBOL(pcmcia_eject_card); |
863 | ||
1da177e4 LT |
864 | |
865 | int pcmcia_insert_card(struct pcmcia_socket *skt) | |
866 | { | |
867 | int ret; | |
868 | ||
869 | cs_dbg(skt, 1, "user insert request\n"); | |
870 | ||
871 | down(&skt->skt_sem); | |
872 | do { | |
873 | if (skt->state & SOCKET_PRESENT) { | |
874 | ret = -EBUSY; | |
875 | break; | |
876 | } | |
877 | if (socket_insert(skt) == CS_NO_CARD) { | |
878 | ret = -ENODEV; | |
879 | break; | |
880 | } | |
881 | ret = 0; | |
882 | } while (0); | |
883 | up(&skt->skt_sem); | |
884 | ||
885 | return ret; | |
886 | } /* insert_card */ | |
33519ddd DB |
887 | EXPORT_SYMBOL(pcmcia_insert_card); |
888 | ||
1da177e4 | 889 | |
3ee13937 DB |
890 | static int pcmcia_socket_hotplug(struct class_device *dev, char **envp, |
891 | int num_envp, char *buffer, int buffer_size) | |
892 | { | |
893 | struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); | |
894 | int i = 0, length = 0; | |
895 | ||
896 | if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
897 | &length, "SOCKET_NO=%u", s->sock)) | |
898 | return -ENOMEM; | |
899 | ||
900 | envp[i] = NULL; | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
1da177e4 LT |
905 | |
906 | struct class pcmcia_socket_class = { | |
907 | .name = "pcmcia_socket", | |
3ee13937 | 908 | .hotplug = pcmcia_socket_hotplug, |
1da177e4 LT |
909 | .release = pcmcia_release_socket, |
910 | }; | |
911 | EXPORT_SYMBOL(pcmcia_socket_class); | |
912 | ||
913 | ||
914 | static int __init init_pcmcia_cs(void) | |
915 | { | |
33519ddd | 916 | int ret = class_register(&pcmcia_socket_class); |
1da177e4 LT |
917 | if (ret) |
918 | return (ret); | |
919 | return class_interface_register(&pccard_sysfs_interface); | |
920 | } | |
921 | ||
922 | static void __exit exit_pcmcia_cs(void) | |
923 | { | |
33519ddd DB |
924 | class_interface_unregister(&pccard_sysfs_interface); |
925 | class_unregister(&pcmcia_socket_class); | |
1da177e4 LT |
926 | } |
927 | ||
928 | subsys_initcall(init_pcmcia_cs); | |
929 | module_exit(exit_pcmcia_cs); | |
930 |