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/string.h> 20 #include <linux/major.h> 21 #include <linux/errno.h> 22 #include <linux/slab.h> 23 #include <linux/mm.h> 24 #include <linux/interrupt.h> 25 #include <linux/timer.h> 26 #include <linux/ioport.h> 27 #include <linux/delay.h> 28 #include <linux/pm.h> 29 #include <linux/device.h> 30 #include <linux/kthread.h> 31 #include <linux/freezer.h> 32 #include <asm/system.h> 33 #include <asm/irq.h> 34 35 #include <pcmcia/cs_types.h> 36 #include <pcmcia/ss.h> 37 #include <pcmcia/cs.h> 38 #include <pcmcia/cistpl.h> 39 #include <pcmcia/cisreg.h> 40 #include <pcmcia/ds.h> 41 #include "cs_internal.h" 42 43 44 /* Module parameters */ 45 46 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>"); 47 MODULE_DESCRIPTION("Linux Kernel Card Services"); 48 MODULE_LICENSE("GPL"); 49 50 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) 51 52 INT_MODULE_PARM(setup_delay, 10); /* centiseconds */ 53 INT_MODULE_PARM(resume_delay, 20); /* centiseconds */ 54 INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */ 55 INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */ 56 INT_MODULE_PARM(reset_time, 10); /* usecs */ 57 INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */ 58 INT_MODULE_PARM(unreset_check, 10); /* centiseconds */ 59 INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */ 60 61 /* Access speed for attribute memory windows */ 62 INT_MODULE_PARM(cis_speed, 300); /* ns */ 63 64 #ifdef DEBUG 65 static int pc_debug; 66 67 module_param(pc_debug, int, 0644); 68 69 int cs_debug_level(int level) 70 { 71 return pc_debug > level; 72 } 73 #endif 74 75 76 socket_state_t dead_socket = { 77 .csc_mask = SS_DETECT, 78 }; 79 EXPORT_SYMBOL(dead_socket); 80 81 82 /* List of all sockets, protected by a rwsem */ 83 LIST_HEAD(pcmcia_socket_list); 84 EXPORT_SYMBOL(pcmcia_socket_list); 85 86 DECLARE_RWSEM(pcmcia_socket_list_rwsem); 87 EXPORT_SYMBOL(pcmcia_socket_list_rwsem); 88 89 90 /* 91 * Low-level PCMCIA socket drivers need to register with the PCCard 92 * core using pcmcia_register_socket. 93 * 94 * socket drivers are expected to use the following callbacks in their 95 * .drv struct: 96 * - pcmcia_socket_dev_suspend 97 * - pcmcia_socket_dev_resume 98 * These functions check for the appropriate struct pcmcia_soket arrays, 99 * and pass them to the low-level functions pcmcia_{suspend,resume}_socket 100 */ 101 static int socket_resume(struct pcmcia_socket *skt); 102 static int socket_suspend(struct pcmcia_socket *skt); 103 104 int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state) 105 { 106 struct pcmcia_socket *socket; 107 108 down_read(&pcmcia_socket_list_rwsem); 109 list_for_each_entry(socket, &pcmcia_socket_list, socket_list) { 110 if (socket->dev.parent != dev) 111 continue; 112 mutex_lock(&socket->skt_mutex); 113 socket_suspend(socket); 114 mutex_unlock(&socket->skt_mutex); 115 } 116 up_read(&pcmcia_socket_list_rwsem); 117 118 return 0; 119 } 120 EXPORT_SYMBOL(pcmcia_socket_dev_suspend); 121 122 int pcmcia_socket_dev_resume(struct device *dev) 123 { 124 struct pcmcia_socket *socket; 125 126 down_read(&pcmcia_socket_list_rwsem); 127 list_for_each_entry(socket, &pcmcia_socket_list, socket_list) { 128 if (socket->dev.parent != dev) 129 continue; 130 mutex_lock(&socket->skt_mutex); 131 socket_resume(socket); 132 mutex_unlock(&socket->skt_mutex); 133 } 134 up_read(&pcmcia_socket_list_rwsem); 135 136 return 0; 137 } 138 EXPORT_SYMBOL(pcmcia_socket_dev_resume); 139 140 141 struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt) 142 { 143 struct device *dev = get_device(&skt->dev); 144 if (!dev) 145 return NULL; 146 skt = dev_get_drvdata(dev); 147 if (!try_module_get(skt->owner)) { 148 put_device(&skt->dev); 149 return NULL; 150 } 151 return (skt); 152 } 153 EXPORT_SYMBOL(pcmcia_get_socket); 154 155 156 void pcmcia_put_socket(struct pcmcia_socket *skt) 157 { 158 module_put(skt->owner); 159 put_device(&skt->dev); 160 } 161 EXPORT_SYMBOL(pcmcia_put_socket); 162 163 164 static void pcmcia_release_socket(struct device *dev) 165 { 166 struct pcmcia_socket *socket = dev_get_drvdata(dev); 167 168 complete(&socket->socket_released); 169 } 170 171 static int pccardd(void *__skt); 172 173 /** 174 * pcmcia_register_socket - add a new pcmcia socket device 175 * @socket: the &socket to register 176 */ 177 int pcmcia_register_socket(struct pcmcia_socket *socket) 178 { 179 struct task_struct *tsk; 180 int ret; 181 182 if (!socket || !socket->ops || !socket->dev.parent || !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 dev_set_drvdata(&socket->dev, socket); 228 socket->dev.class = &pcmcia_socket_class; 229 snprintf(socket->dev.bus_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 mutex_init(&socket->skt_mutex); 240 spin_lock_init(&socket->thread_lock); 241 242 tsk = kthread_run(pccardd, socket, "pccardd"); 243 if (IS_ERR(tsk)) { 244 ret = PTR_ERR(tsk); 245 goto err; 246 } 247 248 wait_for_completion(&socket->thread_done); 249 if (!socket->thread) { 250 printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket); 251 return -EIO; 252 } 253 254 pcmcia_parse_events(socket, SS_DETECT); 255 256 return 0; 257 258 err: 259 down_write(&pcmcia_socket_list_rwsem); 260 list_del(&socket->socket_list); 261 up_write(&pcmcia_socket_list_rwsem); 262 return ret; 263 } /* pcmcia_register_socket */ 264 EXPORT_SYMBOL(pcmcia_register_socket); 265 266 267 /** 268 * pcmcia_unregister_socket - remove a pcmcia socket device 269 * @socket: the &socket to unregister 270 */ 271 void pcmcia_unregister_socket(struct pcmcia_socket *socket) 272 { 273 if (!socket) 274 return; 275 276 cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops); 277 278 if (socket->thread) 279 kthread_stop(socket->thread); 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 /* give socket some time to power down */ 411 msleep(100); 412 413 s->ops->get_status(s, &status); 414 if (status & SS_POWERON) { 415 printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s); 416 } 417 418 cs_socket_put(s); 419 } 420 421 static int socket_setup(struct pcmcia_socket *skt, int initial_delay) 422 { 423 int status, i; 424 425 cs_dbg(skt, 4, "setup\n"); 426 427 skt->ops->get_status(skt, &status); 428 if (!(status & SS_DETECT)) 429 return CS_NO_CARD; 430 431 msleep(initial_delay * 10); 432 433 for (i = 0; i < 100; i++) { 434 skt->ops->get_status(skt, &status); 435 if (!(status & SS_DETECT)) 436 return CS_NO_CARD; 437 438 if (!(status & SS_PENDING)) 439 break; 440 441 msleep(100); 442 } 443 444 if (status & SS_PENDING) { 445 cs_err(skt, "voltage interrogation timed out.\n"); 446 return CS_GENERAL_FAILURE; 447 } 448 449 if (status & SS_CARDBUS) { 450 if (!(skt->features & SS_CAP_CARDBUS)) { 451 cs_err(skt, "cardbus cards are not supported.\n"); 452 return CS_BAD_TYPE; 453 } 454 skt->state |= SOCKET_CARDBUS; 455 } 456 457 /* 458 * Decode the card voltage requirements, and apply power to the card. 459 */ 460 if (status & SS_3VCARD) 461 skt->socket.Vcc = skt->socket.Vpp = 33; 462 else if (!(status & SS_XVCARD)) 463 skt->socket.Vcc = skt->socket.Vpp = 50; 464 else { 465 cs_err(skt, "unsupported voltage key.\n"); 466 return CS_BAD_TYPE; 467 } 468 469 if (skt->power_hook) 470 skt->power_hook(skt, HOOK_POWER_PRE); 471 472 skt->socket.flags = 0; 473 skt->ops->set_socket(skt, &skt->socket); 474 475 /* 476 * Wait "vcc_settle" for the supply to stabilise. 477 */ 478 msleep(vcc_settle * 10); 479 480 skt->ops->get_status(skt, &status); 481 if (!(status & SS_POWERON)) { 482 cs_err(skt, "unable to apply power.\n"); 483 return CS_BAD_TYPE; 484 } 485 486 status = socket_reset(skt); 487 488 if (skt->power_hook) 489 skt->power_hook(skt, HOOK_POWER_POST); 490 491 return status; 492 } 493 494 /* 495 * Handle card insertion. Setup the socket, reset the card, 496 * and then tell the rest of PCMCIA that a card is present. 497 */ 498 static int socket_insert(struct pcmcia_socket *skt) 499 { 500 int ret; 501 502 cs_dbg(skt, 4, "insert\n"); 503 504 if (!cs_socket_get(skt)) 505 return CS_NO_CARD; 506 507 ret = socket_setup(skt, setup_delay); 508 if (ret == CS_SUCCESS) { 509 skt->state |= SOCKET_PRESENT; 510 511 printk(KERN_NOTICE "pccard: %s card inserted into slot %d\n", 512 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 513 skt->sock); 514 515 #ifdef CONFIG_CARDBUS 516 if (skt->state & SOCKET_CARDBUS) { 517 cb_alloc(skt); 518 skt->state |= SOCKET_CARDBUS_CONFIG; 519 } 520 #endif 521 cs_dbg(skt, 4, "insert done\n"); 522 523 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 524 } else { 525 socket_shutdown(skt); 526 } 527 528 return ret; 529 } 530 531 static int socket_suspend(struct pcmcia_socket *skt) 532 { 533 if (skt->state & SOCKET_SUSPEND) 534 return CS_IN_USE; 535 536 send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); 537 skt->socket = dead_socket; 538 skt->ops->set_socket(skt, &skt->socket); 539 if (skt->ops->suspend) 540 skt->ops->suspend(skt); 541 skt->state |= SOCKET_SUSPEND; 542 543 return CS_SUCCESS; 544 } 545 546 /* 547 * Resume a socket. If a card is present, verify its CIS against 548 * our cached copy. If they are different, the card has been 549 * replaced, and we need to tell the drivers. 550 */ 551 static int socket_resume(struct pcmcia_socket *skt) 552 { 553 int ret; 554 555 if (!(skt->state & SOCKET_SUSPEND)) 556 return CS_IN_USE; 557 558 skt->socket = dead_socket; 559 skt->ops->init(skt); 560 skt->ops->set_socket(skt, &skt->socket); 561 562 if (!(skt->state & SOCKET_PRESENT)) { 563 skt->state &= ~SOCKET_SUSPEND; 564 return socket_insert(skt); 565 } 566 567 ret = socket_setup(skt, resume_delay); 568 if (ret == CS_SUCCESS) { 569 /* 570 * FIXME: need a better check here for cardbus cards. 571 */ 572 if (verify_cis_cache(skt) != 0) { 573 cs_dbg(skt, 4, "cis mismatch - different card\n"); 574 socket_remove_drivers(skt); 575 destroy_cis_cache(skt); 576 /* 577 * Workaround: give DS time to schedule removal. 578 * Remove me once the 100ms delay is eliminated 579 * in ds.c 580 */ 581 msleep(200); 582 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 583 } else { 584 cs_dbg(skt, 4, "cis matches cache\n"); 585 send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); 586 } 587 } else { 588 socket_shutdown(skt); 589 } 590 591 skt->state &= ~SOCKET_SUSPEND; 592 593 return CS_SUCCESS; 594 } 595 596 static void socket_remove(struct pcmcia_socket *skt) 597 { 598 printk(KERN_NOTICE "pccard: card ejected from slot %d\n", skt->sock); 599 socket_shutdown(skt); 600 } 601 602 /* 603 * Process a socket card detect status change. 604 * 605 * If we don't have a card already present, delay the detect event for 606 * about 20ms (to be on the safe side) before reading the socket status. 607 * 608 * Some i82365-based systems send multiple SS_DETECT events during card 609 * insertion, and the "card present" status bit seems to bounce. This 610 * will probably be true with GPIO-based card detection systems after 611 * the product has aged. 612 */ 613 static void socket_detect_change(struct pcmcia_socket *skt) 614 { 615 if (!(skt->state & SOCKET_SUSPEND)) { 616 int status; 617 618 if (!(skt->state & SOCKET_PRESENT)) 619 msleep(20); 620 621 skt->ops->get_status(skt, &status); 622 if ((skt->state & SOCKET_PRESENT) && 623 !(status & SS_DETECT)) 624 socket_remove(skt); 625 if (!(skt->state & SOCKET_PRESENT) && 626 (status & SS_DETECT)) 627 socket_insert(skt); 628 } 629 } 630 631 static int pccardd(void *__skt) 632 { 633 struct pcmcia_socket *skt = __skt; 634 int ret; 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 = 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(&skt->thread_done); 648 return 0; 649 } 650 ret = pccard_sysfs_add_socket(&skt->dev); 651 if (ret) 652 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); 653 654 complete(&skt->thread_done); 655 656 set_freezable(); 657 for (;;) { 658 unsigned long flags; 659 unsigned int events; 660 661 set_current_state(TASK_INTERRUPTIBLE); 662 663 spin_lock_irqsave(&skt->thread_lock, flags); 664 events = skt->thread_events; 665 skt->thread_events = 0; 666 spin_unlock_irqrestore(&skt->thread_lock, flags); 667 668 if (events) { 669 mutex_lock(&skt->skt_mutex); 670 if (events & SS_DETECT) 671 socket_detect_change(skt); 672 if (events & SS_BATDEAD) 673 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); 674 if (events & SS_BATWARN) 675 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); 676 if (events & SS_READY) 677 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); 678 mutex_unlock(&skt->skt_mutex); 679 continue; 680 } 681 682 if (kthread_should_stop()) 683 break; 684 685 schedule(); 686 try_to_freeze(); 687 } 688 /* make sure we are running before we exit */ 689 set_current_state(TASK_RUNNING); 690 691 /* remove from the device core */ 692 pccard_sysfs_remove_socket(&skt->dev); 693 device_unregister(&skt->dev); 694 695 return 0; 696 } 697 698 /* 699 * Yenta (at least) probes interrupts before registering the socket and 700 * starting the handler thread. 701 */ 702 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) 703 { 704 unsigned long flags; 705 cs_dbg(s, 4, "parse_events: events %08x\n", events); 706 if (s->thread) { 707 spin_lock_irqsave(&s->thread_lock, flags); 708 s->thread_events |= events; 709 spin_unlock_irqrestore(&s->thread_lock, flags); 710 711 wake_up_process(s->thread); 712 } 713 } /* pcmcia_parse_events */ 714 EXPORT_SYMBOL(pcmcia_parse_events); 715 716 717 /* 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_mutex also protects s->callback */ 723 mutex_lock(&s->skt_mutex); 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 mutex_unlock(&s->skt_mutex); 740 741 return ret; 742 } 743 EXPORT_SYMBOL(pccard_register_pcmcia); 744 745 746 /* 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 */ 750 751 int pccard_reset_card(struct pcmcia_socket *skt) 752 { 753 int ret; 754 755 cs_dbg(skt, 1, "resetting socket\n"); 756 757 mutex_lock(&skt->skt_mutex); 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 (skt->callback) 776 skt->callback->suspend(skt); 777 if (socket_reset(skt) == CS_SUCCESS) { 778 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); 779 if (skt->callback) 780 skt->callback->resume(skt); 781 } 782 } 783 784 ret = CS_SUCCESS; 785 } while (0); 786 mutex_unlock(&skt->skt_mutex); 787 788 return ret; 789 } /* reset_card */ 790 EXPORT_SYMBOL(pccard_reset_card); 791 792 793 /* These shut down or wake up a socket. They are sort of user 794 * initiated versions of the APM suspend and resume actions. 795 */ 796 int pcmcia_suspend_card(struct pcmcia_socket *skt) 797 { 798 int ret; 799 800 cs_dbg(skt, 1, "suspending socket\n"); 801 802 mutex_lock(&skt->skt_mutex); 803 do { 804 if (!(skt->state & SOCKET_PRESENT)) { 805 ret = CS_NO_CARD; 806 break; 807 } 808 if (skt->state & SOCKET_CARDBUS) { 809 ret = CS_UNSUPPORTED_FUNCTION; 810 break; 811 } 812 if (skt->callback) { 813 ret = skt->callback->suspend(skt); 814 if (ret) 815 break; 816 } 817 ret = socket_suspend(skt); 818 } while (0); 819 mutex_unlock(&skt->skt_mutex); 820 821 return ret; 822 } /* suspend_card */ 823 EXPORT_SYMBOL(pcmcia_suspend_card); 824 825 826 int pcmcia_resume_card(struct pcmcia_socket *skt) 827 { 828 int ret; 829 830 cs_dbg(skt, 1, "waking up socket\n"); 831 832 mutex_lock(&skt->skt_mutex); 833 do { 834 if (!(skt->state & SOCKET_PRESENT)) { 835 ret = CS_NO_CARD; 836 break; 837 } 838 if (skt->state & SOCKET_CARDBUS) { 839 ret = CS_UNSUPPORTED_FUNCTION; 840 break; 841 } 842 ret = socket_resume(skt); 843 if (!ret && skt->callback) 844 skt->callback->resume(skt); 845 } while (0); 846 mutex_unlock(&skt->skt_mutex); 847 848 return ret; 849 } /* resume_card */ 850 EXPORT_SYMBOL(pcmcia_resume_card); 851 852 853 /* These handle user requests to eject or insert a card. */ 854 int pcmcia_eject_card(struct pcmcia_socket *skt) 855 { 856 int ret; 857 858 cs_dbg(skt, 1, "user eject request\n"); 859 860 mutex_lock(&skt->skt_mutex); 861 do { 862 if (!(skt->state & SOCKET_PRESENT)) { 863 ret = -ENODEV; 864 break; 865 } 866 867 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); 868 if (ret != 0) { 869 ret = -EINVAL; 870 break; 871 } 872 873 socket_remove(skt); 874 ret = 0; 875 } while (0); 876 mutex_unlock(&skt->skt_mutex); 877 878 return ret; 879 } /* eject_card */ 880 EXPORT_SYMBOL(pcmcia_eject_card); 881 882 883 int pcmcia_insert_card(struct pcmcia_socket *skt) 884 { 885 int ret; 886 887 cs_dbg(skt, 1, "user insert request\n"); 888 889 mutex_lock(&skt->skt_mutex); 890 do { 891 if (skt->state & SOCKET_PRESENT) { 892 ret = -EBUSY; 893 break; 894 } 895 if (socket_insert(skt) == CS_NO_CARD) { 896 ret = -ENODEV; 897 break; 898 } 899 ret = 0; 900 } while (0); 901 mutex_unlock(&skt->skt_mutex); 902 903 return ret; 904 } /* insert_card */ 905 EXPORT_SYMBOL(pcmcia_insert_card); 906 907 908 static int pcmcia_socket_uevent(struct device *dev, 909 struct kobj_uevent_env *env) 910 { 911 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 912 913 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) 914 return -ENOMEM; 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 .dev_uevent = pcmcia_socket_uevent, 931 .dev_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 init_completion(&pcmcia_unload); 940 return class_register(&pcmcia_socket_class); 941 } 942 943 static void __exit exit_pcmcia_cs(void) 944 { 945 class_unregister(&pcmcia_socket_class); 946 wait_for_completion(&pcmcia_unload); 947 } 948 949 subsys_initcall(init_pcmcia_cs); 950 module_exit(exit_pcmcia_cs); 951 952