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 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 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 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); 311 312 313 /** 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 */ 319 static void shutdown_socket(struct pcmcia_socket *s) 320 { 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); 330 #ifdef CONFIG_CARDBUS 331 cb_free(s); 332 #endif 333 s->functions = 0; 334 if (s->config) { 335 kfree(s->config); 336 s->config = NULL; 337 } 338 339 { 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 */ 347 348 349 /** 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 */ 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) { 458 if (!(skt->features & SS_CAP_CARDBUS)) { 459 cs_err(skt, "cardbus cards are not supported.\n"); 460 return CS_BAD_TYPE; 461 } 462 skt->state |= SOCKET_CARDBUS; 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 } 476 477 if (skt->power_hook) 478 skt->power_hook(skt, HOOK_POWER_PRE); 479 480 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 } 493 494 status = socket_reset(skt); 495 496 if (skt->power_hook) 497 skt->power_hook(skt, HOOK_POWER_POST); 498 499 return status; 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 } 657 658 add_wait_queue(&skt->thread_wait, &wait); 659 complete(&skt->thread_done); 660 661 for (;;) { 662 unsigned long flags; 663 unsigned int events; 664 665 set_current_state(TASK_INTERRUPTIBLE); 666 667 spin_lock_irqsave(&skt->thread_lock, flags); 668 events = skt->thread_events; 669 skt->thread_events = 0; 670 spin_unlock_irqrestore(&skt->thread_lock, flags); 671 672 if (events) { 673 down(&skt->skt_sem); 674 if (events & SS_DETECT) 675 socket_detect_change(skt); 676 if (events & SS_BATDEAD) 677 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); 678 if (events & SS_BATWARN) 679 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); 680 if (events & SS_READY) 681 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); 682 up(&skt->skt_sem); 683 continue; 684 } 685 686 if (!skt->thread) 687 break; 688 689 schedule(); 690 try_to_freeze(); 691 } 692 /* make sure we are running before we exit */ 693 set_current_state(TASK_RUNNING); 694 695 remove_wait_queue(&skt->thread_wait, &wait); 696 697 /* remove from the device core */ 698 class_device_unregister(&skt->dev); 699 700 complete_and_exit(&skt->thread_done, 0); 701 } 702 703 /* 704 * Yenta (at least) probes interrupts before registering the socket and 705 * starting the handler thread. 706 */ 707 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) 708 { 709 cs_dbg(s, 4, "parse_events: events %08x\n", events); 710 if (s->thread) { 711 spin_lock(&s->thread_lock); 712 s->thread_events |= events; 713 spin_unlock(&s->thread_lock); 714 715 wake_up(&s->thread_wait); 716 } 717 } /* pcmcia_parse_events */ 718 EXPORT_SYMBOL(pcmcia_parse_events); 719 720 721 /* register pcmcia_callback */ 722 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 723 { 724 int ret = 0; 725 726 /* s->skt_sem also protects s->callback */ 727 down(&s->skt_sem); 728 729 if (c) { 730 /* registration */ 731 if (s->callback) { 732 ret = -EBUSY; 733 goto err; 734 } 735 736 s->callback = c; 737 738 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 739 send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 740 } else 741 s->callback = NULL; 742 err: 743 up(&s->skt_sem); 744 745 return ret; 746 } 747 EXPORT_SYMBOL(pccard_register_pcmcia); 748 749 750 /* I'm not sure which "reset" function this is supposed to use, 751 * but for now, it uses the low-level interface's reset, not the 752 * CIS register. 753 */ 754 755 int pccard_reset_card(struct pcmcia_socket *skt) 756 { 757 int ret; 758 759 cs_dbg(skt, 1, "resetting socket\n"); 760 761 down(&skt->skt_sem); 762 do { 763 if (!(skt->state & SOCKET_PRESENT)) { 764 ret = CS_NO_CARD; 765 break; 766 } 767 if (skt->state & SOCKET_SUSPEND) { 768 ret = CS_IN_USE; 769 break; 770 } 771 if (skt->state & SOCKET_CARDBUS) { 772 ret = CS_UNSUPPORTED_FUNCTION; 773 break; 774 } 775 776 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); 777 if (ret == 0) { 778 send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); 779 if (socket_reset(skt) == CS_SUCCESS) 780 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); 781 } 782 783 ret = CS_SUCCESS; 784 } while (0); 785 up(&skt->skt_sem); 786 787 return ret; 788 } /* reset_card */ 789 EXPORT_SYMBOL(pccard_reset_card); 790 791 792 /* These shut down or wake up a socket. They are sort of user 793 * initiated versions of the APM suspend and resume actions. 794 */ 795 int pcmcia_suspend_card(struct pcmcia_socket *skt) 796 { 797 int ret; 798 799 cs_dbg(skt, 1, "suspending socket\n"); 800 801 down(&skt->skt_sem); 802 do { 803 if (!(skt->state & SOCKET_PRESENT)) { 804 ret = CS_NO_CARD; 805 break; 806 } 807 if (skt->state & SOCKET_CARDBUS) { 808 ret = CS_UNSUPPORTED_FUNCTION; 809 break; 810 } 811 ret = socket_suspend(skt); 812 } while (0); 813 up(&skt->skt_sem); 814 815 return ret; 816 } /* suspend_card */ 817 EXPORT_SYMBOL(pcmcia_suspend_card); 818 819 820 int pcmcia_resume_card(struct pcmcia_socket *skt) 821 { 822 int ret; 823 824 cs_dbg(skt, 1, "waking up socket\n"); 825 826 down(&skt->skt_sem); 827 do { 828 if (!(skt->state & SOCKET_PRESENT)) { 829 ret = CS_NO_CARD; 830 break; 831 } 832 if (skt->state & SOCKET_CARDBUS) { 833 ret = CS_UNSUPPORTED_FUNCTION; 834 break; 835 } 836 ret = socket_resume(skt); 837 } while (0); 838 up(&skt->skt_sem); 839 840 return ret; 841 } /* resume_card */ 842 EXPORT_SYMBOL(pcmcia_resume_card); 843 844 845 /* These handle user requests to eject or insert a card. */ 846 int pcmcia_eject_card(struct pcmcia_socket *skt) 847 { 848 int ret; 849 850 cs_dbg(skt, 1, "user eject request\n"); 851 852 down(&skt->skt_sem); 853 do { 854 if (!(skt->state & SOCKET_PRESENT)) { 855 ret = -ENODEV; 856 break; 857 } 858 859 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); 860 if (ret != 0) { 861 ret = -EINVAL; 862 break; 863 } 864 865 socket_remove(skt); 866 ret = 0; 867 } while (0); 868 up(&skt->skt_sem); 869 870 return ret; 871 } /* eject_card */ 872 EXPORT_SYMBOL(pcmcia_eject_card); 873 874 875 int pcmcia_insert_card(struct pcmcia_socket *skt) 876 { 877 int ret; 878 879 cs_dbg(skt, 1, "user insert request\n"); 880 881 down(&skt->skt_sem); 882 do { 883 if (skt->state & SOCKET_PRESENT) { 884 ret = -EBUSY; 885 break; 886 } 887 if (socket_insert(skt) == CS_NO_CARD) { 888 ret = -ENODEV; 889 break; 890 } 891 ret = 0; 892 } while (0); 893 up(&skt->skt_sem); 894 895 return ret; 896 } /* insert_card */ 897 EXPORT_SYMBOL(pcmcia_insert_card); 898 899 900 static int pcmcia_socket_hotplug(struct class_device *dev, char **envp, 901 int num_envp, char *buffer, int buffer_size) 902 { 903 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 904 int i = 0, length = 0; 905 906 if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, 907 &length, "SOCKET_NO=%u", s->sock)) 908 return -ENOMEM; 909 910 envp[i] = NULL; 911 912 return 0; 913 } 914 915 916 static struct completion pcmcia_unload; 917 918 static void pcmcia_release_socket_class(struct class *data) 919 { 920 complete(&pcmcia_unload); 921 } 922 923 924 struct class pcmcia_socket_class = { 925 .name = "pcmcia_socket", 926 .hotplug = pcmcia_socket_hotplug, 927 .release = pcmcia_release_socket, 928 .class_release = pcmcia_release_socket_class, 929 }; 930 EXPORT_SYMBOL(pcmcia_socket_class); 931 932 933 static int __init init_pcmcia_cs(void) 934 { 935 int ret; 936 937 init_completion(&pcmcia_unload); 938 ret = class_register(&pcmcia_socket_class); 939 if (ret) 940 return (ret); 941 return class_interface_register(&pccard_sysfs_interface); 942 } 943 944 static void __exit exit_pcmcia_cs(void) 945 { 946 class_interface_unregister(&pccard_sysfs_interface); 947 class_unregister(&pcmcia_socket_class); 948 949 wait_for_completion(&pcmcia_unload); 950 } 951 952 subsys_initcall(init_pcmcia_cs); 953 module_exit(exit_pcmcia_cs); 954 955