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/irq.h> 33 34 #include <pcmcia/ss.h> 35 #include <pcmcia/cistpl.h> 36 #include <pcmcia/cisreg.h> 37 #include <pcmcia/ds.h> 38 #include "cs_internal.h" 39 40 41 /* Module parameters */ 42 43 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>"); 44 MODULE_DESCRIPTION("Linux Kernel Card Services"); 45 MODULE_LICENSE("GPL"); 46 47 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) 48 49 INT_MODULE_PARM(setup_delay, 10); /* centiseconds */ 50 INT_MODULE_PARM(resume_delay, 20); /* centiseconds */ 51 INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */ 52 INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */ 53 INT_MODULE_PARM(reset_time, 10); /* usecs */ 54 INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */ 55 INT_MODULE_PARM(unreset_check, 10); /* centiseconds */ 56 INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */ 57 58 /* Access speed for attribute memory windows */ 59 INT_MODULE_PARM(cis_speed, 300); /* ns */ 60 61 62 socket_state_t dead_socket = { 63 .csc_mask = SS_DETECT, 64 }; 65 EXPORT_SYMBOL(dead_socket); 66 67 68 /* List of all sockets, protected by a rwsem */ 69 LIST_HEAD(pcmcia_socket_list); 70 EXPORT_SYMBOL(pcmcia_socket_list); 71 72 DECLARE_RWSEM(pcmcia_socket_list_rwsem); 73 EXPORT_SYMBOL(pcmcia_socket_list_rwsem); 74 75 76 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt) 77 { 78 struct device *dev = get_device(&skt->dev); 79 if (!dev) 80 return NULL; 81 return dev_get_drvdata(dev); 82 } 83 EXPORT_SYMBOL(pcmcia_get_socket); 84 85 86 void pcmcia_put_socket(struct pcmcia_socket *skt) 87 { 88 put_device(&skt->dev); 89 } 90 EXPORT_SYMBOL(pcmcia_put_socket); 91 92 93 static void pcmcia_release_socket(struct device *dev) 94 { 95 struct pcmcia_socket *socket = dev_get_drvdata(dev); 96 97 complete(&socket->socket_released); 98 } 99 100 static int pccardd(void *__skt); 101 102 /** 103 * pcmcia_register_socket - add a new pcmcia socket device 104 * @socket: the &socket to register 105 */ 106 int pcmcia_register_socket(struct pcmcia_socket *socket) 107 { 108 struct task_struct *tsk; 109 int ret; 110 111 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops) 112 return -EINVAL; 113 114 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops); 115 116 /* try to obtain a socket number [yes, it gets ugly if we 117 * register more than 2^sizeof(unsigned int) pcmcia 118 * sockets... but the socket number is deprecated 119 * anyways, so I don't care] */ 120 down_write(&pcmcia_socket_list_rwsem); 121 if (list_empty(&pcmcia_socket_list)) 122 socket->sock = 0; 123 else { 124 unsigned int found, i = 1; 125 struct pcmcia_socket *tmp; 126 do { 127 found = 1; 128 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { 129 if (tmp->sock == i) 130 found = 0; 131 } 132 i++; 133 } while (!found); 134 socket->sock = i - 1; 135 } 136 list_add_tail(&socket->socket_list, &pcmcia_socket_list); 137 up_write(&pcmcia_socket_list_rwsem); 138 139 #ifndef CONFIG_CARDBUS 140 /* 141 * If we do not support Cardbus, ensure that 142 * the Cardbus socket capability is disabled. 143 */ 144 socket->features &= ~SS_CAP_CARDBUS; 145 #endif 146 147 /* set proper values in socket->dev */ 148 dev_set_drvdata(&socket->dev, socket); 149 socket->dev.class = &pcmcia_socket_class; 150 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock); 151 152 /* base address = 0, map = 0 */ 153 socket->cis_mem.flags = 0; 154 socket->cis_mem.speed = cis_speed; 155 156 INIT_LIST_HEAD(&socket->cis_cache); 157 158 init_completion(&socket->socket_released); 159 init_completion(&socket->thread_done); 160 mutex_init(&socket->skt_mutex); 161 mutex_init(&socket->ops_mutex); 162 spin_lock_init(&socket->thread_lock); 163 164 if (socket->resource_ops->init) { 165 mutex_lock(&socket->ops_mutex); 166 ret = socket->resource_ops->init(socket); 167 mutex_unlock(&socket->ops_mutex); 168 if (ret) 169 goto err; 170 } 171 172 tsk = kthread_run(pccardd, socket, "pccardd"); 173 if (IS_ERR(tsk)) { 174 ret = PTR_ERR(tsk); 175 goto err; 176 } 177 178 wait_for_completion(&socket->thread_done); 179 if (!socket->thread) { 180 dev_warn(&socket->dev, 181 "PCMCIA: warning: socket thread did not start\n"); 182 return -EIO; 183 } 184 185 pcmcia_parse_events(socket, SS_DETECT); 186 187 /* 188 * Let's try to get the PCMCIA module for 16-bit PCMCIA support. 189 * If it fails, it doesn't matter -- we still have 32-bit CardBus 190 * support to offer, so this is not a failure mode. 191 */ 192 request_module_nowait("pcmcia"); 193 194 return 0; 195 196 err: 197 down_write(&pcmcia_socket_list_rwsem); 198 list_del(&socket->socket_list); 199 up_write(&pcmcia_socket_list_rwsem); 200 return ret; 201 } /* pcmcia_register_socket */ 202 EXPORT_SYMBOL(pcmcia_register_socket); 203 204 205 /** 206 * pcmcia_unregister_socket - remove a pcmcia socket device 207 * @socket: the &socket to unregister 208 */ 209 void pcmcia_unregister_socket(struct pcmcia_socket *socket) 210 { 211 if (!socket) 212 return; 213 214 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops); 215 216 if (socket->thread) 217 kthread_stop(socket->thread); 218 219 /* remove from our own list */ 220 down_write(&pcmcia_socket_list_rwsem); 221 list_del(&socket->socket_list); 222 up_write(&pcmcia_socket_list_rwsem); 223 224 /* wait for sysfs to drop all references */ 225 if (socket->resource_ops->exit) { 226 mutex_lock(&socket->ops_mutex); 227 socket->resource_ops->exit(socket); 228 mutex_unlock(&socket->ops_mutex); 229 } 230 wait_for_completion(&socket->socket_released); 231 } /* pcmcia_unregister_socket */ 232 EXPORT_SYMBOL(pcmcia_unregister_socket); 233 234 235 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr) 236 { 237 struct pcmcia_socket *s; 238 239 down_read(&pcmcia_socket_list_rwsem); 240 list_for_each_entry(s, &pcmcia_socket_list, socket_list) 241 if (s->sock == nr) { 242 up_read(&pcmcia_socket_list_rwsem); 243 return s; 244 } 245 up_read(&pcmcia_socket_list_rwsem); 246 247 return NULL; 248 249 } 250 EXPORT_SYMBOL(pcmcia_get_socket_by_nr); 251 252 static int socket_reset(struct pcmcia_socket *skt) 253 { 254 int status, i; 255 256 dev_dbg(&skt->dev, "reset\n"); 257 258 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; 259 skt->ops->set_socket(skt, &skt->socket); 260 udelay((long)reset_time); 261 262 skt->socket.flags &= ~SS_RESET; 263 skt->ops->set_socket(skt, &skt->socket); 264 265 msleep(unreset_delay * 10); 266 for (i = 0; i < unreset_limit; i++) { 267 skt->ops->get_status(skt, &status); 268 269 if (!(status & SS_DETECT)) 270 return -ENODEV; 271 272 if (status & SS_READY) 273 return 0; 274 275 msleep(unreset_check * 10); 276 } 277 278 dev_err(&skt->dev, "time out after reset\n"); 279 return -ETIMEDOUT; 280 } 281 282 /* 283 * socket_setup() and socket_shutdown() are called by the main event handler 284 * when card insertion and removal events are received. 285 * socket_setup() turns on socket power and resets the socket, in two stages. 286 * socket_shutdown() unconfigures a socket and turns off socket power. 287 */ 288 static void socket_shutdown(struct pcmcia_socket *s) 289 { 290 int status; 291 292 dev_dbg(&s->dev, "shutdown\n"); 293 294 if (s->callback) 295 s->callback->remove(s); 296 297 mutex_lock(&s->ops_mutex); 298 s->state &= SOCKET_INUSE | SOCKET_PRESENT; 299 msleep(shutdown_delay * 10); 300 s->state &= SOCKET_INUSE; 301 302 /* Blank out the socket state */ 303 s->socket = dead_socket; 304 s->ops->init(s); 305 s->ops->set_socket(s, &s->socket); 306 s->lock_count = 0; 307 kfree(s->fake_cis); 308 s->fake_cis = NULL; 309 s->functions = 0; 310 311 /* From here on we can be sure that only we (that is, the 312 * pccardd thread) accesses this socket, and all (16-bit) 313 * PCMCIA interactions are gone. Therefore, release 314 * ops_mutex so that we don't get a sysfs-related lockdep 315 * warning. 316 */ 317 mutex_unlock(&s->ops_mutex); 318 319 #ifdef CONFIG_CARDBUS 320 cb_free(s); 321 #endif 322 323 /* give socket some time to power down */ 324 msleep(100); 325 326 s->ops->get_status(s, &status); 327 if (status & SS_POWERON) { 328 dev_err(&s->dev, 329 "*** DANGER *** unable to remove socket power\n"); 330 } 331 332 s->state &= ~SOCKET_INUSE; 333 } 334 335 static int socket_setup(struct pcmcia_socket *skt, int initial_delay) 336 { 337 int status, i; 338 339 dev_dbg(&skt->dev, "setup\n"); 340 341 skt->ops->get_status(skt, &status); 342 if (!(status & SS_DETECT)) 343 return -ENODEV; 344 345 msleep(initial_delay * 10); 346 347 for (i = 0; i < 100; i++) { 348 skt->ops->get_status(skt, &status); 349 if (!(status & SS_DETECT)) 350 return -ENODEV; 351 352 if (!(status & SS_PENDING)) 353 break; 354 355 msleep(100); 356 } 357 358 if (status & SS_PENDING) { 359 dev_err(&skt->dev, "voltage interrogation timed out\n"); 360 return -ETIMEDOUT; 361 } 362 363 if (status & SS_CARDBUS) { 364 if (!(skt->features & SS_CAP_CARDBUS)) { 365 dev_err(&skt->dev, "cardbus cards are not supported\n"); 366 return -EINVAL; 367 } 368 skt->state |= SOCKET_CARDBUS; 369 } else 370 skt->state &= ~SOCKET_CARDBUS; 371 372 /* 373 * Decode the card voltage requirements, and apply power to the card. 374 */ 375 if (status & SS_3VCARD) 376 skt->socket.Vcc = skt->socket.Vpp = 33; 377 else if (!(status & SS_XVCARD)) 378 skt->socket.Vcc = skt->socket.Vpp = 50; 379 else { 380 dev_err(&skt->dev, "unsupported voltage key\n"); 381 return -EIO; 382 } 383 384 if (skt->power_hook) 385 skt->power_hook(skt, HOOK_POWER_PRE); 386 387 skt->socket.flags = 0; 388 skt->ops->set_socket(skt, &skt->socket); 389 390 /* 391 * Wait "vcc_settle" for the supply to stabilise. 392 */ 393 msleep(vcc_settle * 10); 394 395 skt->ops->get_status(skt, &status); 396 if (!(status & SS_POWERON)) { 397 dev_err(&skt->dev, "unable to apply power\n"); 398 return -EIO; 399 } 400 401 status = socket_reset(skt); 402 403 if (skt->power_hook) 404 skt->power_hook(skt, HOOK_POWER_POST); 405 406 return status; 407 } 408 409 /* 410 * Handle card insertion. Setup the socket, reset the card, 411 * and then tell the rest of PCMCIA that a card is present. 412 */ 413 static int socket_insert(struct pcmcia_socket *skt) 414 { 415 int ret; 416 417 dev_dbg(&skt->dev, "insert\n"); 418 419 mutex_lock(&skt->ops_mutex); 420 if (skt->state & SOCKET_INUSE) { 421 mutex_unlock(&skt->ops_mutex); 422 return -EINVAL; 423 } 424 skt->state |= SOCKET_INUSE; 425 426 ret = socket_setup(skt, setup_delay); 427 if (ret == 0) { 428 skt->state |= SOCKET_PRESENT; 429 430 dev_notice(&skt->dev, "pccard: %s card inserted into slot %d\n", 431 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 432 skt->sock); 433 434 #ifdef CONFIG_CARDBUS 435 if (skt->state & SOCKET_CARDBUS) { 436 cb_alloc(skt); 437 skt->state |= SOCKET_CARDBUS_CONFIG; 438 } 439 #endif 440 dev_dbg(&skt->dev, "insert done\n"); 441 mutex_unlock(&skt->ops_mutex); 442 443 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) 444 skt->callback->add(skt); 445 } else { 446 mutex_unlock(&skt->ops_mutex); 447 socket_shutdown(skt); 448 } 449 450 return ret; 451 } 452 453 static int socket_suspend(struct pcmcia_socket *skt) 454 { 455 if (skt->state & SOCKET_SUSPEND) 456 return -EBUSY; 457 458 mutex_lock(&skt->ops_mutex); 459 skt->suspended_state = skt->state; 460 461 skt->socket = dead_socket; 462 skt->ops->set_socket(skt, &skt->socket); 463 if (skt->ops->suspend) 464 skt->ops->suspend(skt); 465 skt->state |= SOCKET_SUSPEND; 466 mutex_unlock(&skt->ops_mutex); 467 return 0; 468 } 469 470 static int socket_early_resume(struct pcmcia_socket *skt) 471 { 472 mutex_lock(&skt->ops_mutex); 473 skt->socket = dead_socket; 474 skt->ops->init(skt); 475 skt->ops->set_socket(skt, &skt->socket); 476 if (skt->state & SOCKET_PRESENT) 477 skt->resume_status = socket_setup(skt, resume_delay); 478 mutex_unlock(&skt->ops_mutex); 479 return 0; 480 } 481 482 static int socket_late_resume(struct pcmcia_socket *skt) 483 { 484 int ret = 0; 485 486 mutex_lock(&skt->ops_mutex); 487 skt->state &= ~SOCKET_SUSPEND; 488 mutex_unlock(&skt->ops_mutex); 489 490 if (!(skt->state & SOCKET_PRESENT)) { 491 ret = socket_insert(skt); 492 if (ret == -ENODEV) 493 ret = 0; 494 return ret; 495 } 496 497 if (skt->resume_status) { 498 socket_shutdown(skt); 499 return 0; 500 } 501 502 if (skt->suspended_state != skt->state) { 503 dev_dbg(&skt->dev, 504 "suspend state 0x%x != resume state 0x%x\n", 505 skt->suspended_state, skt->state); 506 507 socket_shutdown(skt); 508 return socket_insert(skt); 509 } 510 511 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) 512 ret = skt->callback->early_resume(skt); 513 return ret; 514 } 515 516 /* 517 * Finalize the resume. In case of a cardbus socket, we have 518 * to rebind the devices as we can't be certain that it has been 519 * replaced, or not. 520 */ 521 static int socket_complete_resume(struct pcmcia_socket *skt) 522 { 523 int ret = 0; 524 #ifdef CONFIG_CARDBUS 525 if (skt->state & SOCKET_CARDBUS) { 526 /* We can't be sure the CardBus card is the same 527 * as the one previously inserted. Therefore, remove 528 * and re-add... */ 529 cb_free(skt); 530 ret = cb_alloc(skt); 531 if (ret) 532 cb_free(skt); 533 } 534 #endif 535 return ret; 536 } 537 538 /* 539 * Resume a socket. If a card is present, verify its CIS against 540 * our cached copy. If they are different, the card has been 541 * replaced, and we need to tell the drivers. 542 */ 543 static int socket_resume(struct pcmcia_socket *skt) 544 { 545 int err; 546 if (!(skt->state & SOCKET_SUSPEND)) 547 return -EBUSY; 548 549 socket_early_resume(skt); 550 err = socket_late_resume(skt); 551 if (!err) 552 err = socket_complete_resume(skt); 553 return err; 554 } 555 556 static void socket_remove(struct pcmcia_socket *skt) 557 { 558 dev_notice(&skt->dev, "pccard: card ejected from slot %d\n", skt->sock); 559 socket_shutdown(skt); 560 } 561 562 /* 563 * Process a socket card detect status change. 564 * 565 * If we don't have a card already present, delay the detect event for 566 * about 20ms (to be on the safe side) before reading the socket status. 567 * 568 * Some i82365-based systems send multiple SS_DETECT events during card 569 * insertion, and the "card present" status bit seems to bounce. This 570 * will probably be true with GPIO-based card detection systems after 571 * the product has aged. 572 */ 573 static void socket_detect_change(struct pcmcia_socket *skt) 574 { 575 if (!(skt->state & SOCKET_SUSPEND)) { 576 int status; 577 578 if (!(skt->state & SOCKET_PRESENT)) 579 msleep(20); 580 581 skt->ops->get_status(skt, &status); 582 if ((skt->state & SOCKET_PRESENT) && 583 !(status & SS_DETECT)) 584 socket_remove(skt); 585 if (!(skt->state & SOCKET_PRESENT) && 586 (status & SS_DETECT)) 587 socket_insert(skt); 588 } 589 } 590 591 static int pccardd(void *__skt) 592 { 593 struct pcmcia_socket *skt = __skt; 594 int ret; 595 596 skt->thread = current; 597 skt->socket = dead_socket; 598 skt->ops->init(skt); 599 skt->ops->set_socket(skt, &skt->socket); 600 601 /* register with the device core */ 602 ret = device_register(&skt->dev); 603 if (ret) { 604 dev_warn(&skt->dev, "PCMCIA: unable to register socket\n"); 605 skt->thread = NULL; 606 complete(&skt->thread_done); 607 return 0; 608 } 609 ret = pccard_sysfs_add_socket(&skt->dev); 610 if (ret) 611 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); 612 613 complete(&skt->thread_done); 614 615 /* wait for userspace to catch up */ 616 msleep(250); 617 618 set_freezable(); 619 for (;;) { 620 unsigned long flags; 621 unsigned int events; 622 unsigned int sysfs_events; 623 624 spin_lock_irqsave(&skt->thread_lock, flags); 625 events = skt->thread_events; 626 skt->thread_events = 0; 627 sysfs_events = skt->sysfs_events; 628 skt->sysfs_events = 0; 629 spin_unlock_irqrestore(&skt->thread_lock, flags); 630 631 mutex_lock(&skt->skt_mutex); 632 if (events & SS_DETECT) 633 socket_detect_change(skt); 634 635 if (sysfs_events) { 636 if (sysfs_events & PCMCIA_UEVENT_EJECT) 637 socket_remove(skt); 638 if (sysfs_events & PCMCIA_UEVENT_INSERT) 639 socket_insert(skt); 640 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) && 641 !(skt->state & SOCKET_CARDBUS)) { 642 if (skt->callback) 643 ret = skt->callback->suspend(skt); 644 else 645 ret = 0; 646 if (!ret) { 647 socket_suspend(skt); 648 msleep(100); 649 } 650 } 651 if ((sysfs_events & PCMCIA_UEVENT_RESUME) && 652 !(skt->state & SOCKET_CARDBUS)) { 653 ret = socket_resume(skt); 654 if (!ret && skt->callback) 655 skt->callback->resume(skt); 656 } 657 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) && 658 !(skt->state & SOCKET_CARDBUS)) { 659 if (!ret && skt->callback) 660 skt->callback->requery(skt); 661 } 662 } 663 mutex_unlock(&skt->skt_mutex); 664 665 if (events || sysfs_events) 666 continue; 667 668 if (kthread_should_stop()) 669 break; 670 671 set_current_state(TASK_INTERRUPTIBLE); 672 673 schedule(); 674 675 /* make sure we are running */ 676 __set_current_state(TASK_RUNNING); 677 678 try_to_freeze(); 679 } 680 681 /* shut down socket, if a device is still present */ 682 if (skt->state & SOCKET_PRESENT) { 683 mutex_lock(&skt->skt_mutex); 684 socket_remove(skt); 685 mutex_unlock(&skt->skt_mutex); 686 } 687 688 /* remove from the device core */ 689 pccard_sysfs_remove_socket(&skt->dev); 690 device_unregister(&skt->dev); 691 692 return 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 unsigned long flags; 702 dev_dbg(&s->dev, "parse_events: events %08x\n", events); 703 if (s->thread) { 704 spin_lock_irqsave(&s->thread_lock, flags); 705 s->thread_events |= events; 706 spin_unlock_irqrestore(&s->thread_lock, flags); 707 708 wake_up_process(s->thread); 709 } 710 } /* pcmcia_parse_events */ 711 EXPORT_SYMBOL(pcmcia_parse_events); 712 713 /** 714 * pcmcia_parse_uevents() - tell pccardd to issue manual commands 715 * @s: the PCMCIA socket we wan't to command 716 * @events: events to pass to pccardd 717 * 718 * userspace-issued insert, eject, suspend and resume commands must be 719 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events 720 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert), 721 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend) 722 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card). 723 */ 724 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events) 725 { 726 unsigned long flags; 727 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events); 728 if (s->thread) { 729 spin_lock_irqsave(&s->thread_lock, flags); 730 s->sysfs_events |= events; 731 spin_unlock_irqrestore(&s->thread_lock, flags); 732 733 wake_up_process(s->thread); 734 } 735 } 736 EXPORT_SYMBOL(pcmcia_parse_uevents); 737 738 739 /* register pcmcia_callback */ 740 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 741 { 742 int ret = 0; 743 744 /* s->skt_mutex also protects s->callback */ 745 mutex_lock(&s->skt_mutex); 746 747 if (c) { 748 /* registration */ 749 if (s->callback) { 750 ret = -EBUSY; 751 goto err; 752 } 753 754 s->callback = c; 755 756 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 757 s->callback->add(s); 758 } else 759 s->callback = NULL; 760 err: 761 mutex_unlock(&s->skt_mutex); 762 763 return ret; 764 } 765 EXPORT_SYMBOL(pccard_register_pcmcia); 766 767 768 /* I'm not sure which "reset" function this is supposed to use, 769 * but for now, it uses the low-level interface's reset, not the 770 * CIS register. 771 */ 772 773 int pcmcia_reset_card(struct pcmcia_socket *skt) 774 { 775 int ret; 776 777 dev_dbg(&skt->dev, "resetting socket\n"); 778 779 mutex_lock(&skt->skt_mutex); 780 do { 781 if (!(skt->state & SOCKET_PRESENT)) { 782 dev_dbg(&skt->dev, "can't reset, not present\n"); 783 ret = -ENODEV; 784 break; 785 } 786 if (skt->state & SOCKET_SUSPEND) { 787 dev_dbg(&skt->dev, "can't reset, suspended\n"); 788 ret = -EBUSY; 789 break; 790 } 791 if (skt->state & SOCKET_CARDBUS) { 792 dev_dbg(&skt->dev, "can't reset, is cardbus\n"); 793 ret = -EPERM; 794 break; 795 } 796 797 if (skt->callback) 798 skt->callback->suspend(skt); 799 mutex_lock(&skt->ops_mutex); 800 ret = socket_reset(skt); 801 mutex_unlock(&skt->ops_mutex); 802 if ((ret == 0) && (skt->callback)) 803 skt->callback->resume(skt); 804 805 ret = 0; 806 } while (0); 807 mutex_unlock(&skt->skt_mutex); 808 809 return ret; 810 } /* reset_card */ 811 EXPORT_SYMBOL(pcmcia_reset_card); 812 813 814 static int pcmcia_socket_uevent(struct device *dev, 815 struct kobj_uevent_env *env) 816 { 817 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 818 819 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) 820 return -ENOMEM; 821 822 return 0; 823 } 824 825 826 static struct completion pcmcia_unload; 827 828 static void pcmcia_release_socket_class(struct class *data) 829 { 830 complete(&pcmcia_unload); 831 } 832 833 834 #ifdef CONFIG_PM 835 836 static int __pcmcia_pm_op(struct device *dev, 837 int (*callback) (struct pcmcia_socket *skt)) 838 { 839 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 840 int ret; 841 842 mutex_lock(&s->skt_mutex); 843 ret = callback(s); 844 mutex_unlock(&s->skt_mutex); 845 846 return ret; 847 } 848 849 static int pcmcia_socket_dev_suspend_noirq(struct device *dev) 850 { 851 return __pcmcia_pm_op(dev, socket_suspend); 852 } 853 854 static int pcmcia_socket_dev_resume_noirq(struct device *dev) 855 { 856 return __pcmcia_pm_op(dev, socket_early_resume); 857 } 858 859 static int __used pcmcia_socket_dev_resume(struct device *dev) 860 { 861 return __pcmcia_pm_op(dev, socket_late_resume); 862 } 863 864 static void __used pcmcia_socket_dev_complete(struct device *dev) 865 { 866 WARN(__pcmcia_pm_op(dev, socket_complete_resume), 867 "failed to complete resume"); 868 } 869 870 static const struct dev_pm_ops pcmcia_socket_pm_ops = { 871 /* dev_resume may be called with IRQs enabled */ 872 SET_SYSTEM_SLEEP_PM_OPS(NULL, 873 pcmcia_socket_dev_resume) 874 875 /* late suspend must be called with IRQs disabled */ 876 .suspend_noirq = pcmcia_socket_dev_suspend_noirq, 877 .freeze_noirq = pcmcia_socket_dev_suspend_noirq, 878 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq, 879 880 /* early resume must be called with IRQs disabled */ 881 .resume_noirq = pcmcia_socket_dev_resume_noirq, 882 .thaw_noirq = pcmcia_socket_dev_resume_noirq, 883 .restore_noirq = pcmcia_socket_dev_resume_noirq, 884 .complete = pcmcia_socket_dev_complete, 885 }; 886 887 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops) 888 889 #else /* CONFIG_PM */ 890 891 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL 892 893 #endif /* CONFIG_PM */ 894 895 struct class pcmcia_socket_class = { 896 .name = "pcmcia_socket", 897 .dev_uevent = pcmcia_socket_uevent, 898 .dev_release = pcmcia_release_socket, 899 .class_release = pcmcia_release_socket_class, 900 .pm = PCMCIA_SOCKET_CLASS_PM_OPS, 901 }; 902 EXPORT_SYMBOL(pcmcia_socket_class); 903 904 905 static int __init init_pcmcia_cs(void) 906 { 907 init_completion(&pcmcia_unload); 908 return class_register(&pcmcia_socket_class); 909 } 910 911 static void __exit exit_pcmcia_cs(void) 912 { 913 class_unregister(&pcmcia_socket_class); 914 wait_for_completion(&pcmcia_unload); 915 } 916 917 subsys_initcall(init_pcmcia_cs); 918 module_exit(exit_pcmcia_cs); 919 920