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/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 45 46 /* Module parameters */ 47 48 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>"); 49 MODULE_DESCRIPTION("Linux Kernel Card Services"); 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 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 77 78 socket_state_t dead_socket = { 79 .csc_mask = SS_DETECT, 80 }; 81 EXPORT_SYMBOL(dead_socket); 82 83 84 /* List of all sockets, protected by a rwsem */ 85 LIST_HEAD(pcmcia_socket_list); 86 EXPORT_SYMBOL(pcmcia_socket_list); 87 88 DECLARE_RWSEM(pcmcia_socket_list_rwsem); 89 EXPORT_SYMBOL(pcmcia_socket_list_rwsem); 90 91 92 /** 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 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 mutex_lock(&socket->skt_mutex); 115 socket_suspend(socket); 116 mutex_unlock(&socket->skt_mutex); 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 mutex_lock(&socket->skt_mutex); 133 socket_resume(socket); 134 mutex_unlock(&socket->skt_mutex); 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 196 * register more than 2^sizeof(unsigned int) pcmcia 197 * sockets... but the socket number is deprecated 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 #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 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 mutex_init(&socket->skt_mutex); 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 /** 313 * The central event handler. Send_event() sends an event to the 314 * 16-bit subsystem, which then calls the relevant device drivers. 315 * Parse_events() interprets the event bits from 316 * a card status change report. Do_shutdown() handles the high 317 * priority stuff associated with a card removal. 318 */ 319 320 /* NOTE: send_event needs to be called with skt->sem held. */ 321 322 static int send_event(struct pcmcia_socket *s, event_t event, int priority) 323 { 324 int ret; 325 326 if (s->state & SOCKET_CARDBUS) 327 return 0; 328 329 cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n", 330 event, priority, s->callback); 331 332 if (!s->callback) 333 return 0; 334 if (!try_module_get(s->callback->owner)) 335 return 0; 336 337 ret = s->callback->event(s, event, priority); 338 339 module_put(s->callback->owner); 340 341 return ret; 342 } 343 344 static void socket_remove_drivers(struct pcmcia_socket *skt) 345 { 346 cs_dbg(skt, 4, "remove_drivers\n"); 347 348 send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH); 349 } 350 351 static int socket_reset(struct pcmcia_socket *skt) 352 { 353 int status, i; 354 355 cs_dbg(skt, 4, "reset\n"); 356 357 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; 358 skt->ops->set_socket(skt, &skt->socket); 359 udelay((long)reset_time); 360 361 skt->socket.flags &= ~SS_RESET; 362 skt->ops->set_socket(skt, &skt->socket); 363 364 msleep(unreset_delay * 10); 365 for (i = 0; i < unreset_limit; i++) { 366 skt->ops->get_status(skt, &status); 367 368 if (!(status & SS_DETECT)) 369 return CS_NO_CARD; 370 371 if (status & SS_READY) 372 return CS_SUCCESS; 373 374 msleep(unreset_check * 10); 375 } 376 377 cs_err(skt, "time out after reset.\n"); 378 return CS_GENERAL_FAILURE; 379 } 380 381 /** 382 * socket_setup() and socket_shutdown() are called by the main event handler 383 * when card insertion and removal events are received. 384 * socket_setup() turns on socket power and resets the socket, in two stages. 385 * socket_shutdown() unconfigures a socket and turns off socket power. 386 */ 387 static void socket_shutdown(struct pcmcia_socket *s) 388 { 389 int status; 390 391 cs_dbg(s, 4, "shutdown\n"); 392 393 socket_remove_drivers(s); 394 s->state &= SOCKET_INUSE | SOCKET_PRESENT; 395 msleep(shutdown_delay * 10); 396 s->state &= SOCKET_INUSE; 397 398 /* Blank out the socket state */ 399 s->socket = dead_socket; 400 s->ops->init(s); 401 s->ops->set_socket(s, &s->socket); 402 s->irq.AssignedIRQ = s->irq.Config = 0; 403 s->lock_count = 0; 404 destroy_cis_cache(s); 405 #ifdef CONFIG_CARDBUS 406 cb_free(s); 407 #endif 408 s->functions = 0; 409 410 s->ops->get_status(s, &status); 411 if (status & SS_POWERON) { 412 printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s); 413 } 414 415 cs_socket_put(s); 416 } 417 418 static int socket_setup(struct pcmcia_socket *skt, int initial_delay) 419 { 420 int status, i; 421 422 cs_dbg(skt, 4, "setup\n"); 423 424 skt->ops->get_status(skt, &status); 425 if (!(status & SS_DETECT)) 426 return CS_NO_CARD; 427 428 msleep(initial_delay * 10); 429 430 for (i = 0; i < 100; i++) { 431 skt->ops->get_status(skt, &status); 432 if (!(status & SS_DETECT)) 433 return CS_NO_CARD; 434 435 if (!(status & SS_PENDING)) 436 break; 437 438 msleep(100); 439 } 440 441 if (status & SS_PENDING) { 442 cs_err(skt, "voltage interrogation timed out.\n"); 443 return CS_GENERAL_FAILURE; 444 } 445 446 if (status & SS_CARDBUS) { 447 if (!(skt->features & SS_CAP_CARDBUS)) { 448 cs_err(skt, "cardbus cards are not supported.\n"); 449 return CS_BAD_TYPE; 450 } 451 skt->state |= SOCKET_CARDBUS; 452 } 453 454 /* 455 * Decode the card voltage requirements, and apply power to the card. 456 */ 457 if (status & SS_3VCARD) 458 skt->socket.Vcc = skt->socket.Vpp = 33; 459 else if (!(status & SS_XVCARD)) 460 skt->socket.Vcc = skt->socket.Vpp = 50; 461 else { 462 cs_err(skt, "unsupported voltage key.\n"); 463 return CS_BAD_TYPE; 464 } 465 466 if (skt->power_hook) 467 skt->power_hook(skt, HOOK_POWER_PRE); 468 469 skt->socket.flags = 0; 470 skt->ops->set_socket(skt, &skt->socket); 471 472 /* 473 * Wait "vcc_settle" for the supply to stabilise. 474 */ 475 msleep(vcc_settle * 10); 476 477 skt->ops->get_status(skt, &status); 478 if (!(status & SS_POWERON)) { 479 cs_err(skt, "unable to apply power.\n"); 480 return CS_BAD_TYPE; 481 } 482 483 status = socket_reset(skt); 484 485 if (skt->power_hook) 486 skt->power_hook(skt, HOOK_POWER_POST); 487 488 return status; 489 } 490 491 /* 492 * Handle card insertion. Setup the socket, reset the card, 493 * and then tell the rest of PCMCIA that a card is present. 494 */ 495 static int socket_insert(struct pcmcia_socket *skt) 496 { 497 int ret; 498 499 cs_dbg(skt, 4, "insert\n"); 500 501 if (!cs_socket_get(skt)) 502 return CS_NO_CARD; 503 504 ret = socket_setup(skt, setup_delay); 505 if (ret == CS_SUCCESS) { 506 skt->state |= SOCKET_PRESENT; 507 508 printk(KERN_NOTICE "pccard: %s card inserted into slot %d\n", 509 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 510 skt->sock); 511 512 #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 } 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 } 587 588 skt->state &= ~SOCKET_SUSPEND; 589 590 return CS_SUCCESS; 591 } 592 593 static void socket_remove(struct pcmcia_socket *skt) 594 { 595 printk(KERN_NOTICE "pccard: card ejected from slot %d\n", skt->sock); 596 socket_shutdown(skt); 597 } 598 599 /* 600 * Process a socket card detect status change. 601 * 602 * If we don't have a card already present, delay the detect event for 603 * about 20ms (to be on the safe side) before reading the socket status. 604 * 605 * Some i82365-based systems send multiple SS_DETECT events during card 606 * insertion, and the "card present" status bit seems to bounce. This 607 * will probably be true with GPIO-based card detection systems after 608 * the product has aged. 609 */ 610 static void socket_detect_change(struct pcmcia_socket *skt) 611 { 612 if (!(skt->state & SOCKET_SUSPEND)) { 613 int status; 614 615 if (!(skt->state & SOCKET_PRESENT)) 616 msleep(20); 617 618 skt->ops->get_status(skt, &status); 619 if ((skt->state & SOCKET_PRESENT) && 620 !(status & SS_DETECT)) 621 socket_remove(skt); 622 if (!(skt->state & SOCKET_PRESENT) && 623 (status & SS_DETECT)) 624 socket_insert(skt); 625 } 626 } 627 628 static int pccardd(void *__skt) 629 { 630 struct pcmcia_socket *skt = __skt; 631 DECLARE_WAITQUEUE(wait, current); 632 int ret; 633 634 daemonize("pccardd"); 635 636 skt->thread = current; 637 skt->socket = dead_socket; 638 skt->ops->init(skt); 639 skt->ops->set_socket(skt, &skt->socket); 640 641 /* register with the device core */ 642 ret = class_device_register(&skt->dev); 643 if (ret) { 644 printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n", 645 skt); 646 skt->thread = NULL; 647 complete_and_exit(&skt->thread_done, 0); 648 } 649 650 add_wait_queue(&skt->thread_wait, &wait); 651 complete(&skt->thread_done); 652 653 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 mutex_lock(&skt->skt_mutex); 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 mutex_unlock(&skt->skt_mutex); 675 continue; 676 } 677 678 if (!skt->thread) 679 break; 680 681 schedule(); 682 try_to_freeze(); 683 } 684 /* make sure we are running before we exit */ 685 set_current_state(TASK_RUNNING); 686 687 remove_wait_queue(&skt->thread_wait, &wait); 688 689 /* remove from the device core */ 690 class_device_unregister(&skt->dev); 691 692 complete_and_exit(&skt->thread_done, 0); 693 } 694 695 /* 696 * Yenta (at least) probes interrupts before registering the socket and 697 * starting the handler thread. 698 */ 699 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) 700 { 701 cs_dbg(s, 4, "parse_events: events %08x\n", events); 702 if (s->thread) { 703 spin_lock(&s->thread_lock); 704 s->thread_events |= events; 705 spin_unlock(&s->thread_lock); 706 707 wake_up(&s->thread_wait); 708 } 709 } /* pcmcia_parse_events */ 710 EXPORT_SYMBOL(pcmcia_parse_events); 711 712 713 /* register pcmcia_callback */ 714 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 715 { 716 int ret = 0; 717 718 /* s->skt_mutex also protects s->callback */ 719 mutex_lock(&s->skt_mutex); 720 721 if (c) { 722 /* registration */ 723 if (s->callback) { 724 ret = -EBUSY; 725 goto err; 726 } 727 728 s->callback = c; 729 730 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 731 send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 732 } else 733 s->callback = NULL; 734 err: 735 mutex_unlock(&s->skt_mutex); 736 737 return ret; 738 } 739 EXPORT_SYMBOL(pccard_register_pcmcia); 740 741 742 /* I'm not sure which "reset" function this is supposed to use, 743 * but for now, it uses the low-level interface's reset, not the 744 * CIS register. 745 */ 746 747 int pccard_reset_card(struct pcmcia_socket *skt) 748 { 749 int ret; 750 751 cs_dbg(skt, 1, "resetting socket\n"); 752 753 mutex_lock(&skt->skt_mutex); 754 do { 755 if (!(skt->state & SOCKET_PRESENT)) { 756 ret = CS_NO_CARD; 757 break; 758 } 759 if (skt->state & SOCKET_SUSPEND) { 760 ret = CS_IN_USE; 761 break; 762 } 763 if (skt->state & SOCKET_CARDBUS) { 764 ret = CS_UNSUPPORTED_FUNCTION; 765 break; 766 } 767 768 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); 769 if (ret == 0) { 770 send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); 771 if (skt->callback) 772 skt->callback->suspend(skt); 773 if (socket_reset(skt) == CS_SUCCESS) { 774 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); 775 if (skt->callback) 776 skt->callback->resume(skt); 777 } 778 } 779 780 ret = CS_SUCCESS; 781 } while (0); 782 mutex_unlock(&skt->skt_mutex); 783 784 return ret; 785 } /* reset_card */ 786 EXPORT_SYMBOL(pccard_reset_card); 787 788 789 /* These shut down or wake up a socket. They are sort of user 790 * initiated versions of the APM suspend and resume actions. 791 */ 792 int pcmcia_suspend_card(struct pcmcia_socket *skt) 793 { 794 int ret; 795 796 cs_dbg(skt, 1, "suspending socket\n"); 797 798 mutex_lock(&skt->skt_mutex); 799 do { 800 if (!(skt->state & SOCKET_PRESENT)) { 801 ret = CS_NO_CARD; 802 break; 803 } 804 if (skt->state & SOCKET_CARDBUS) { 805 ret = CS_UNSUPPORTED_FUNCTION; 806 break; 807 } 808 if (skt->callback) { 809 ret = skt->callback->suspend(skt); 810 if (ret) 811 break; 812 } 813 ret = socket_suspend(skt); 814 } while (0); 815 mutex_unlock(&skt->skt_mutex); 816 817 return ret; 818 } /* suspend_card */ 819 EXPORT_SYMBOL(pcmcia_suspend_card); 820 821 822 int pcmcia_resume_card(struct pcmcia_socket *skt) 823 { 824 int ret; 825 826 cs_dbg(skt, 1, "waking up socket\n"); 827 828 mutex_lock(&skt->skt_mutex); 829 do { 830 if (!(skt->state & SOCKET_PRESENT)) { 831 ret = CS_NO_CARD; 832 break; 833 } 834 if (skt->state & SOCKET_CARDBUS) { 835 ret = CS_UNSUPPORTED_FUNCTION; 836 break; 837 } 838 ret = socket_resume(skt); 839 if (!ret && skt->callback) 840 skt->callback->resume(skt); 841 } while (0); 842 mutex_unlock(&skt->skt_mutex); 843 844 return ret; 845 } /* resume_card */ 846 EXPORT_SYMBOL(pcmcia_resume_card); 847 848 849 /* These handle user requests to eject or insert a card. */ 850 int pcmcia_eject_card(struct pcmcia_socket *skt) 851 { 852 int ret; 853 854 cs_dbg(skt, 1, "user eject request\n"); 855 856 mutex_lock(&skt->skt_mutex); 857 do { 858 if (!(skt->state & SOCKET_PRESENT)) { 859 ret = -ENODEV; 860 break; 861 } 862 863 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); 864 if (ret != 0) { 865 ret = -EINVAL; 866 break; 867 } 868 869 socket_remove(skt); 870 ret = 0; 871 } while (0); 872 mutex_unlock(&skt->skt_mutex); 873 874 return ret; 875 } /* eject_card */ 876 EXPORT_SYMBOL(pcmcia_eject_card); 877 878 879 int pcmcia_insert_card(struct pcmcia_socket *skt) 880 { 881 int ret; 882 883 cs_dbg(skt, 1, "user insert request\n"); 884 885 mutex_lock(&skt->skt_mutex); 886 do { 887 if (skt->state & SOCKET_PRESENT) { 888 ret = -EBUSY; 889 break; 890 } 891 if (socket_insert(skt) == CS_NO_CARD) { 892 ret = -ENODEV; 893 break; 894 } 895 ret = 0; 896 } while (0); 897 mutex_unlock(&skt->skt_mutex); 898 899 return ret; 900 } /* insert_card */ 901 EXPORT_SYMBOL(pcmcia_insert_card); 902 903 904 static int pcmcia_socket_uevent(struct class_device *dev, char **envp, 905 int num_envp, char *buffer, int buffer_size) 906 { 907 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 908 int i = 0, length = 0; 909 910 if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, 911 &length, "SOCKET_NO=%u", s->sock)) 912 return -ENOMEM; 913 914 envp[i] = NULL; 915 916 return 0; 917 } 918 919 920 static struct completion pcmcia_unload; 921 922 static void pcmcia_release_socket_class(struct class *data) 923 { 924 complete(&pcmcia_unload); 925 } 926 927 928 struct class pcmcia_socket_class = { 929 .name = "pcmcia_socket", 930 .uevent = pcmcia_socket_uevent, 931 .release = pcmcia_release_socket, 932 .class_release = pcmcia_release_socket_class, 933 }; 934 EXPORT_SYMBOL(pcmcia_socket_class); 935 936 937 static int __init init_pcmcia_cs(void) 938 { 939 int ret; 940 941 init_completion(&pcmcia_unload); 942 ret = class_register(&pcmcia_socket_class); 943 if (ret) 944 return (ret); 945 return class_interface_register(&pccard_sysfs_interface); 946 } 947 948 static void __exit exit_pcmcia_cs(void) 949 { 950 class_interface_unregister(&pccard_sysfs_interface); 951 class_unregister(&pcmcia_socket_class); 952 953 wait_for_completion(&pcmcia_unload); 954 } 955 956 subsys_initcall(init_pcmcia_cs); 957 module_exit(exit_pcmcia_cs); 958 959