1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * cs.c -- Kernel Card Services - core services 4 * 5 * The initial developer of the original code is David A. Hinds 6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds 7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved. 8 * 9 * (C) 1999 David A. Hinds 10 */ 11 12 #include <linux/module.h> 13 #include <linux/moduleparam.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/string.h> 17 #include <linux/major.h> 18 #include <linux/errno.h> 19 #include <linux/slab.h> 20 #include <linux/mm.h> 21 #include <linux/interrupt.h> 22 #include <linux/timer.h> 23 #include <linux/ioport.h> 24 #include <linux/delay.h> 25 #include <linux/pm.h> 26 #include <linux/device.h> 27 #include <linux/kthread.h> 28 #include <linux/freezer.h> 29 #include <asm/irq.h> 30 31 #include <pcmcia/ss.h> 32 #include <pcmcia/cistpl.h> 33 #include <pcmcia/cisreg.h> 34 #include <pcmcia/ds.h> 35 #include "cs_internal.h" 36 37 38 /* Module parameters */ 39 40 MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>"); 41 MODULE_DESCRIPTION("Linux Kernel Card Services"); 42 MODULE_LICENSE("GPL"); 43 44 #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) 45 46 INT_MODULE_PARM(setup_delay, 10); /* centiseconds */ 47 INT_MODULE_PARM(resume_delay, 20); /* centiseconds */ 48 INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */ 49 INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */ 50 INT_MODULE_PARM(reset_time, 10); /* usecs */ 51 INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */ 52 INT_MODULE_PARM(unreset_check, 10); /* centiseconds */ 53 INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */ 54 55 /* Access speed for attribute memory windows */ 56 INT_MODULE_PARM(cis_speed, 300); /* ns */ 57 58 59 socket_state_t dead_socket = { 60 .csc_mask = SS_DETECT, 61 }; 62 EXPORT_SYMBOL(dead_socket); 63 64 65 /* List of all sockets, protected by a rwsem */ 66 LIST_HEAD(pcmcia_socket_list); 67 EXPORT_SYMBOL(pcmcia_socket_list); 68 69 DECLARE_RWSEM(pcmcia_socket_list_rwsem); 70 EXPORT_SYMBOL(pcmcia_socket_list_rwsem); 71 72 73 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt) 74 { 75 struct device *dev = get_device(&skt->dev); 76 if (!dev) 77 return NULL; 78 return dev_get_drvdata(dev); 79 } 80 EXPORT_SYMBOL(pcmcia_get_socket); 81 82 83 void pcmcia_put_socket(struct pcmcia_socket *skt) 84 { 85 put_device(&skt->dev); 86 } 87 EXPORT_SYMBOL(pcmcia_put_socket); 88 89 90 static void pcmcia_release_socket(struct device *dev) 91 { 92 struct pcmcia_socket *socket = dev_get_drvdata(dev); 93 94 complete(&socket->socket_released); 95 } 96 97 static int pccardd(void *__skt); 98 99 /** 100 * pcmcia_register_socket - add a new pcmcia socket device 101 * @socket: the &socket to register 102 */ 103 int pcmcia_register_socket(struct pcmcia_socket *socket) 104 { 105 struct task_struct *tsk; 106 int ret; 107 108 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops) 109 return -EINVAL; 110 111 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops); 112 113 /* try to obtain a socket number [yes, it gets ugly if we 114 * register more than 2^sizeof(unsigned int) pcmcia 115 * sockets... but the socket number is deprecated 116 * anyways, so I don't care] */ 117 down_write(&pcmcia_socket_list_rwsem); 118 if (list_empty(&pcmcia_socket_list)) 119 socket->sock = 0; 120 else { 121 unsigned int found, i = 1; 122 struct pcmcia_socket *tmp; 123 do { 124 found = 1; 125 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { 126 if (tmp->sock == i) 127 found = 0; 128 } 129 i++; 130 } while (!found); 131 socket->sock = i - 1; 132 } 133 list_add_tail(&socket->socket_list, &pcmcia_socket_list); 134 up_write(&pcmcia_socket_list_rwsem); 135 136 #ifndef CONFIG_CARDBUS 137 /* 138 * If we do not support Cardbus, ensure that 139 * the Cardbus socket capability is disabled. 140 */ 141 socket->features &= ~SS_CAP_CARDBUS; 142 #endif 143 144 /* set proper values in socket->dev */ 145 dev_set_drvdata(&socket->dev, socket); 146 socket->dev.class = &pcmcia_socket_class; 147 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock); 148 149 /* base address = 0, map = 0 */ 150 socket->cis_mem.flags = 0; 151 socket->cis_mem.speed = cis_speed; 152 153 INIT_LIST_HEAD(&socket->cis_cache); 154 155 init_completion(&socket->socket_released); 156 init_completion(&socket->thread_done); 157 mutex_init(&socket->skt_mutex); 158 mutex_init(&socket->ops_mutex); 159 spin_lock_init(&socket->thread_lock); 160 161 if (socket->resource_ops->init) { 162 mutex_lock(&socket->ops_mutex); 163 ret = socket->resource_ops->init(socket); 164 mutex_unlock(&socket->ops_mutex); 165 if (ret) 166 goto err; 167 } 168 169 tsk = kthread_run(pccardd, socket, "pccardd"); 170 if (IS_ERR(tsk)) { 171 ret = PTR_ERR(tsk); 172 goto err; 173 } 174 175 wait_for_completion(&socket->thread_done); 176 if (!socket->thread) { 177 dev_warn(&socket->dev, 178 "PCMCIA: warning: socket thread did not start\n"); 179 return -EIO; 180 } 181 182 pcmcia_parse_events(socket, SS_DETECT); 183 184 /* 185 * Let's try to get the PCMCIA module for 16-bit PCMCIA support. 186 * If it fails, it doesn't matter -- we still have 32-bit CardBus 187 * support to offer, so this is not a failure mode. 188 */ 189 request_module_nowait("pcmcia"); 190 191 return 0; 192 193 err: 194 down_write(&pcmcia_socket_list_rwsem); 195 list_del(&socket->socket_list); 196 up_write(&pcmcia_socket_list_rwsem); 197 return ret; 198 } /* pcmcia_register_socket */ 199 EXPORT_SYMBOL(pcmcia_register_socket); 200 201 202 /** 203 * pcmcia_unregister_socket - remove a pcmcia socket device 204 * @socket: the &socket to unregister 205 */ 206 void pcmcia_unregister_socket(struct pcmcia_socket *socket) 207 { 208 if (!socket) 209 return; 210 211 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops); 212 213 if (socket->thread) 214 kthread_stop(socket->thread); 215 216 /* remove from our own list */ 217 down_write(&pcmcia_socket_list_rwsem); 218 list_del(&socket->socket_list); 219 up_write(&pcmcia_socket_list_rwsem); 220 221 /* wait for sysfs to drop all references */ 222 if (socket->resource_ops->exit) { 223 mutex_lock(&socket->ops_mutex); 224 socket->resource_ops->exit(socket); 225 mutex_unlock(&socket->ops_mutex); 226 } 227 wait_for_completion(&socket->socket_released); 228 } /* pcmcia_unregister_socket */ 229 EXPORT_SYMBOL(pcmcia_unregister_socket); 230 231 232 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr) 233 { 234 struct pcmcia_socket *s; 235 236 down_read(&pcmcia_socket_list_rwsem); 237 list_for_each_entry(s, &pcmcia_socket_list, socket_list) 238 if (s->sock == nr) { 239 up_read(&pcmcia_socket_list_rwsem); 240 return s; 241 } 242 up_read(&pcmcia_socket_list_rwsem); 243 244 return NULL; 245 246 } 247 EXPORT_SYMBOL(pcmcia_get_socket_by_nr); 248 249 static int socket_reset(struct pcmcia_socket *skt) 250 { 251 int status, i; 252 253 dev_dbg(&skt->dev, "reset\n"); 254 255 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; 256 skt->ops->set_socket(skt, &skt->socket); 257 udelay((long)reset_time); 258 259 skt->socket.flags &= ~SS_RESET; 260 skt->ops->set_socket(skt, &skt->socket); 261 262 msleep(unreset_delay * 10); 263 for (i = 0; i < unreset_limit; i++) { 264 skt->ops->get_status(skt, &status); 265 266 if (!(status & SS_DETECT)) 267 return -ENODEV; 268 269 if (status & SS_READY) 270 return 0; 271 272 msleep(unreset_check * 10); 273 } 274 275 dev_err(&skt->dev, "time out after reset\n"); 276 return -ETIMEDOUT; 277 } 278 279 /* 280 * socket_setup() and socket_shutdown() are called by the main event handler 281 * when card insertion and removal events are received. 282 * socket_setup() turns on socket power and resets the socket, in two stages. 283 * socket_shutdown() unconfigures a socket and turns off socket power. 284 */ 285 static void socket_shutdown(struct pcmcia_socket *s) 286 { 287 int status; 288 289 dev_dbg(&s->dev, "shutdown\n"); 290 291 if (s->callback) 292 s->callback->remove(s); 293 294 mutex_lock(&s->ops_mutex); 295 s->state &= SOCKET_INUSE | SOCKET_PRESENT; 296 msleep(shutdown_delay * 10); 297 s->state &= SOCKET_INUSE; 298 299 /* Blank out the socket state */ 300 s->socket = dead_socket; 301 s->ops->init(s); 302 s->ops->set_socket(s, &s->socket); 303 s->lock_count = 0; 304 kfree(s->fake_cis); 305 s->fake_cis = NULL; 306 s->functions = 0; 307 308 /* From here on we can be sure that only we (that is, the 309 * pccardd thread) accesses this socket, and all (16-bit) 310 * PCMCIA interactions are gone. Therefore, release 311 * ops_mutex so that we don't get a sysfs-related lockdep 312 * warning. 313 */ 314 mutex_unlock(&s->ops_mutex); 315 316 #ifdef CONFIG_CARDBUS 317 cb_free(s); 318 #endif 319 320 /* give socket some time to power down */ 321 msleep(100); 322 323 s->ops->get_status(s, &status); 324 if (status & SS_POWERON) { 325 dev_err(&s->dev, 326 "*** DANGER *** unable to remove socket power\n"); 327 } 328 329 s->state &= ~SOCKET_INUSE; 330 } 331 332 static int socket_setup(struct pcmcia_socket *skt, int initial_delay) 333 { 334 int status, i; 335 336 dev_dbg(&skt->dev, "setup\n"); 337 338 skt->ops->get_status(skt, &status); 339 if (!(status & SS_DETECT)) 340 return -ENODEV; 341 342 msleep(initial_delay * 10); 343 344 for (i = 0; i < 100; i++) { 345 skt->ops->get_status(skt, &status); 346 if (!(status & SS_DETECT)) 347 return -ENODEV; 348 349 if (!(status & SS_PENDING)) 350 break; 351 352 msleep(100); 353 } 354 355 if (status & SS_PENDING) { 356 dev_err(&skt->dev, "voltage interrogation timed out\n"); 357 return -ETIMEDOUT; 358 } 359 360 if (status & SS_CARDBUS) { 361 if (!(skt->features & SS_CAP_CARDBUS)) { 362 dev_err(&skt->dev, "cardbus cards are not supported\n"); 363 return -EINVAL; 364 } 365 skt->state |= SOCKET_CARDBUS; 366 } else 367 skt->state &= ~SOCKET_CARDBUS; 368 369 /* 370 * Decode the card voltage requirements, and apply power to the card. 371 */ 372 if (status & SS_3VCARD) 373 skt->socket.Vcc = skt->socket.Vpp = 33; 374 else if (!(status & SS_XVCARD)) 375 skt->socket.Vcc = skt->socket.Vpp = 50; 376 else { 377 dev_err(&skt->dev, "unsupported voltage key\n"); 378 return -EIO; 379 } 380 381 if (skt->power_hook) 382 skt->power_hook(skt, HOOK_POWER_PRE); 383 384 skt->socket.flags = 0; 385 skt->ops->set_socket(skt, &skt->socket); 386 387 /* 388 * Wait "vcc_settle" for the supply to stabilise. 389 */ 390 msleep(vcc_settle * 10); 391 392 skt->ops->get_status(skt, &status); 393 if (!(status & SS_POWERON)) { 394 dev_err(&skt->dev, "unable to apply power\n"); 395 return -EIO; 396 } 397 398 status = socket_reset(skt); 399 400 if (skt->power_hook) 401 skt->power_hook(skt, HOOK_POWER_POST); 402 403 return status; 404 } 405 406 /* 407 * Handle card insertion. Setup the socket, reset the card, 408 * and then tell the rest of PCMCIA that a card is present. 409 */ 410 static int socket_insert(struct pcmcia_socket *skt) 411 { 412 int ret; 413 414 dev_dbg(&skt->dev, "insert\n"); 415 416 mutex_lock(&skt->ops_mutex); 417 if (skt->state & SOCKET_INUSE) { 418 mutex_unlock(&skt->ops_mutex); 419 return -EINVAL; 420 } 421 skt->state |= SOCKET_INUSE; 422 423 ret = socket_setup(skt, setup_delay); 424 if (ret == 0) { 425 skt->state |= SOCKET_PRESENT; 426 427 dev_notice(&skt->dev, "pccard: %s card inserted into slot %d\n", 428 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 429 skt->sock); 430 431 #ifdef CONFIG_CARDBUS 432 if (skt->state & SOCKET_CARDBUS) { 433 cb_alloc(skt); 434 skt->state |= SOCKET_CARDBUS_CONFIG; 435 } 436 #endif 437 dev_dbg(&skt->dev, "insert done\n"); 438 mutex_unlock(&skt->ops_mutex); 439 440 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) 441 skt->callback->add(skt); 442 } else { 443 mutex_unlock(&skt->ops_mutex); 444 socket_shutdown(skt); 445 } 446 447 return ret; 448 } 449 450 static int socket_suspend(struct pcmcia_socket *skt) 451 { 452 if ((skt->state & SOCKET_SUSPEND) && !(skt->state & SOCKET_IN_RESUME)) 453 return -EBUSY; 454 455 mutex_lock(&skt->ops_mutex); 456 /* store state on first suspend, but not after spurious wakeups */ 457 if (!(skt->state & SOCKET_IN_RESUME)) 458 skt->suspended_state = skt->state; 459 460 skt->socket = dead_socket; 461 skt->ops->set_socket(skt, &skt->socket); 462 if (skt->ops->suspend) 463 skt->ops->suspend(skt); 464 skt->state |= SOCKET_SUSPEND; 465 skt->state &= ~SOCKET_IN_RESUME; 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 skt->state |= SOCKET_IN_RESUME; 479 mutex_unlock(&skt->ops_mutex); 480 return 0; 481 } 482 483 static int socket_late_resume(struct pcmcia_socket *skt) 484 { 485 int ret = 0; 486 487 mutex_lock(&skt->ops_mutex); 488 skt->state &= ~(SOCKET_SUSPEND | SOCKET_IN_RESUME); 489 mutex_unlock(&skt->ops_mutex); 490 491 if (!(skt->state & SOCKET_PRESENT)) { 492 ret = socket_insert(skt); 493 if (ret == -ENODEV) 494 ret = 0; 495 return ret; 496 } 497 498 if (skt->resume_status) { 499 socket_shutdown(skt); 500 return 0; 501 } 502 503 if (skt->suspended_state != skt->state) { 504 dev_dbg(&skt->dev, 505 "suspend state 0x%x != resume state 0x%x\n", 506 skt->suspended_state, skt->state); 507 508 socket_shutdown(skt); 509 return socket_insert(skt); 510 } 511 512 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) 513 ret = skt->callback->early_resume(skt); 514 return ret; 515 } 516 517 /* 518 * Finalize the resume. In case of a cardbus socket, we have 519 * to rebind the devices as we can't be certain that it has been 520 * replaced, or not. 521 */ 522 static int socket_complete_resume(struct pcmcia_socket *skt) 523 { 524 int ret = 0; 525 #ifdef CONFIG_CARDBUS 526 if (skt->state & SOCKET_CARDBUS) { 527 /* We can't be sure the CardBus card is the same 528 * as the one previously inserted. Therefore, remove 529 * and re-add... */ 530 cb_free(skt); 531 ret = cb_alloc(skt); 532 if (ret) 533 cb_free(skt); 534 } 535 #endif 536 return ret; 537 } 538 539 /* 540 * Resume a socket. If a card is present, verify its CIS against 541 * our cached copy. If they are different, the card has been 542 * replaced, and we need to tell the drivers. 543 */ 544 static int socket_resume(struct pcmcia_socket *skt) 545 { 546 int err; 547 if (!(skt->state & SOCKET_SUSPEND)) 548 return -EBUSY; 549 550 socket_early_resume(skt); 551 err = socket_late_resume(skt); 552 if (!err) 553 err = socket_complete_resume(skt); 554 return err; 555 } 556 557 static void socket_remove(struct pcmcia_socket *skt) 558 { 559 dev_notice(&skt->dev, "pccard: card ejected from slot %d\n", skt->sock); 560 socket_shutdown(skt); 561 } 562 563 /* 564 * Process a socket card detect status change. 565 * 566 * If we don't have a card already present, delay the detect event for 567 * about 20ms (to be on the safe side) before reading the socket status. 568 * 569 * Some i82365-based systems send multiple SS_DETECT events during card 570 * insertion, and the "card present" status bit seems to bounce. This 571 * will probably be true with GPIO-based card detection systems after 572 * the product has aged. 573 */ 574 static void socket_detect_change(struct pcmcia_socket *skt) 575 { 576 if (!(skt->state & SOCKET_SUSPEND)) { 577 int status; 578 579 if (!(skt->state & SOCKET_PRESENT)) 580 msleep(20); 581 582 skt->ops->get_status(skt, &status); 583 if ((skt->state & SOCKET_PRESENT) && 584 !(status & SS_DETECT)) 585 socket_remove(skt); 586 if (!(skt->state & SOCKET_PRESENT) && 587 (status & SS_DETECT)) 588 socket_insert(skt); 589 } 590 } 591 592 static int pccardd(void *__skt) 593 { 594 struct pcmcia_socket *skt = __skt; 595 int ret; 596 597 skt->thread = current; 598 skt->socket = dead_socket; 599 skt->ops->init(skt); 600 skt->ops->set_socket(skt, &skt->socket); 601 602 /* register with the device core */ 603 ret = device_register(&skt->dev); 604 if (ret) { 605 dev_warn(&skt->dev, "PCMCIA: unable to register socket\n"); 606 skt->thread = NULL; 607 complete(&skt->thread_done); 608 return 0; 609 } 610 ret = pccard_sysfs_add_socket(&skt->dev); 611 if (ret) 612 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); 613 614 complete(&skt->thread_done); 615 616 /* wait for userspace to catch up */ 617 msleep(250); 618 619 set_freezable(); 620 for (;;) { 621 unsigned long flags; 622 unsigned int events; 623 unsigned int sysfs_events; 624 625 spin_lock_irqsave(&skt->thread_lock, flags); 626 events = skt->thread_events; 627 skt->thread_events = 0; 628 sysfs_events = skt->sysfs_events; 629 skt->sysfs_events = 0; 630 spin_unlock_irqrestore(&skt->thread_lock, flags); 631 632 mutex_lock(&skt->skt_mutex); 633 if (events & SS_DETECT) 634 socket_detect_change(skt); 635 636 if (sysfs_events) { 637 if (sysfs_events & PCMCIA_UEVENT_EJECT) 638 socket_remove(skt); 639 if (sysfs_events & PCMCIA_UEVENT_INSERT) 640 socket_insert(skt); 641 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) && 642 !(skt->state & SOCKET_CARDBUS)) { 643 if (skt->callback) 644 ret = skt->callback->suspend(skt); 645 else 646 ret = 0; 647 if (!ret) { 648 socket_suspend(skt); 649 msleep(100); 650 } 651 } 652 if ((sysfs_events & PCMCIA_UEVENT_RESUME) && 653 !(skt->state & SOCKET_CARDBUS)) { 654 ret = socket_resume(skt); 655 if (!ret && skt->callback) 656 skt->callback->resume(skt); 657 } 658 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) && 659 !(skt->state & SOCKET_CARDBUS)) { 660 if (!ret && skt->callback) 661 skt->callback->requery(skt); 662 } 663 } 664 mutex_unlock(&skt->skt_mutex); 665 666 if (events || sysfs_events) 667 continue; 668 669 if (kthread_should_stop()) 670 break; 671 672 set_current_state(TASK_INTERRUPTIBLE); 673 674 schedule(); 675 676 /* make sure we are running */ 677 __set_current_state(TASK_RUNNING); 678 679 try_to_freeze(); 680 } 681 682 /* shut down socket, if a device is still present */ 683 if (skt->state & SOCKET_PRESENT) { 684 mutex_lock(&skt->skt_mutex); 685 socket_remove(skt); 686 mutex_unlock(&skt->skt_mutex); 687 } 688 689 /* remove from the device core */ 690 pccard_sysfs_remove_socket(&skt->dev); 691 device_unregister(&skt->dev); 692 693 return 0; 694 } 695 696 /* 697 * Yenta (at least) probes interrupts before registering the socket and 698 * starting the handler thread. 699 */ 700 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) 701 { 702 unsigned long flags; 703 dev_dbg(&s->dev, "parse_events: events %08x\n", events); 704 if (s->thread) { 705 spin_lock_irqsave(&s->thread_lock, flags); 706 s->thread_events |= events; 707 spin_unlock_irqrestore(&s->thread_lock, flags); 708 709 wake_up_process(s->thread); 710 } 711 } /* pcmcia_parse_events */ 712 EXPORT_SYMBOL(pcmcia_parse_events); 713 714 /** 715 * pcmcia_parse_uevents() - tell pccardd to issue manual commands 716 * @s: the PCMCIA socket we wan't to command 717 * @events: events to pass to pccardd 718 * 719 * userspace-issued insert, eject, suspend and resume commands must be 720 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events 721 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert), 722 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend) 723 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card). 724 */ 725 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events) 726 { 727 unsigned long flags; 728 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events); 729 if (s->thread) { 730 spin_lock_irqsave(&s->thread_lock, flags); 731 s->sysfs_events |= events; 732 spin_unlock_irqrestore(&s->thread_lock, flags); 733 734 wake_up_process(s->thread); 735 } 736 } 737 EXPORT_SYMBOL(pcmcia_parse_uevents); 738 739 740 /* register pcmcia_callback */ 741 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 742 { 743 int ret = 0; 744 745 /* s->skt_mutex also protects s->callback */ 746 mutex_lock(&s->skt_mutex); 747 748 if (c) { 749 /* registration */ 750 if (s->callback) { 751 ret = -EBUSY; 752 goto err; 753 } 754 755 s->callback = c; 756 757 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 758 s->callback->add(s); 759 } else 760 s->callback = NULL; 761 err: 762 mutex_unlock(&s->skt_mutex); 763 764 return ret; 765 } 766 EXPORT_SYMBOL(pccard_register_pcmcia); 767 768 769 /* I'm not sure which "reset" function this is supposed to use, 770 * but for now, it uses the low-level interface's reset, not the 771 * CIS register. 772 */ 773 774 int pcmcia_reset_card(struct pcmcia_socket *skt) 775 { 776 int ret; 777 778 dev_dbg(&skt->dev, "resetting socket\n"); 779 780 mutex_lock(&skt->skt_mutex); 781 do { 782 if (!(skt->state & SOCKET_PRESENT)) { 783 dev_dbg(&skt->dev, "can't reset, not present\n"); 784 ret = -ENODEV; 785 break; 786 } 787 if (skt->state & SOCKET_SUSPEND) { 788 dev_dbg(&skt->dev, "can't reset, suspended\n"); 789 ret = -EBUSY; 790 break; 791 } 792 if (skt->state & SOCKET_CARDBUS) { 793 dev_dbg(&skt->dev, "can't reset, is cardbus\n"); 794 ret = -EPERM; 795 break; 796 } 797 798 if (skt->callback) 799 skt->callback->suspend(skt); 800 mutex_lock(&skt->ops_mutex); 801 ret = socket_reset(skt); 802 mutex_unlock(&skt->ops_mutex); 803 if ((ret == 0) && (skt->callback)) 804 skt->callback->resume(skt); 805 806 ret = 0; 807 } while (0); 808 mutex_unlock(&skt->skt_mutex); 809 810 return ret; 811 } /* reset_card */ 812 EXPORT_SYMBOL(pcmcia_reset_card); 813 814 815 static int pcmcia_socket_uevent(struct device *dev, 816 struct kobj_uevent_env *env) 817 { 818 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 819 820 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) 821 return -ENOMEM; 822 823 return 0; 824 } 825 826 827 static struct completion pcmcia_unload; 828 829 static void pcmcia_release_socket_class(struct class *data) 830 { 831 complete(&pcmcia_unload); 832 } 833 834 835 #ifdef CONFIG_PM 836 837 static int __pcmcia_pm_op(struct device *dev, 838 int (*callback) (struct pcmcia_socket *skt)) 839 { 840 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 841 int ret; 842 843 mutex_lock(&s->skt_mutex); 844 ret = callback(s); 845 mutex_unlock(&s->skt_mutex); 846 847 return ret; 848 } 849 850 static int pcmcia_socket_dev_suspend_noirq(struct device *dev) 851 { 852 return __pcmcia_pm_op(dev, socket_suspend); 853 } 854 855 static int pcmcia_socket_dev_resume_noirq(struct device *dev) 856 { 857 return __pcmcia_pm_op(dev, socket_early_resume); 858 } 859 860 static int __used pcmcia_socket_dev_resume(struct device *dev) 861 { 862 return __pcmcia_pm_op(dev, socket_late_resume); 863 } 864 865 static void __used pcmcia_socket_dev_complete(struct device *dev) 866 { 867 WARN(__pcmcia_pm_op(dev, socket_complete_resume), 868 "failed to complete resume"); 869 } 870 871 static const struct dev_pm_ops pcmcia_socket_pm_ops = { 872 /* dev_resume may be called with IRQs enabled */ 873 SET_SYSTEM_SLEEP_PM_OPS(NULL, 874 pcmcia_socket_dev_resume) 875 876 /* late suspend must be called with IRQs disabled */ 877 .suspend_noirq = pcmcia_socket_dev_suspend_noirq, 878 .freeze_noirq = pcmcia_socket_dev_suspend_noirq, 879 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq, 880 881 /* early resume must be called with IRQs disabled */ 882 .resume_noirq = pcmcia_socket_dev_resume_noirq, 883 .thaw_noirq = pcmcia_socket_dev_resume_noirq, 884 .restore_noirq = pcmcia_socket_dev_resume_noirq, 885 .complete = pcmcia_socket_dev_complete, 886 }; 887 888 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops) 889 890 #else /* CONFIG_PM */ 891 892 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL 893 894 #endif /* CONFIG_PM */ 895 896 struct class pcmcia_socket_class = { 897 .name = "pcmcia_socket", 898 .dev_uevent = pcmcia_socket_uevent, 899 .dev_release = pcmcia_release_socket, 900 .class_release = pcmcia_release_socket_class, 901 .pm = PCMCIA_SOCKET_CLASS_PM_OPS, 902 }; 903 EXPORT_SYMBOL(pcmcia_socket_class); 904 905 906 static int __init init_pcmcia_cs(void) 907 { 908 init_completion(&pcmcia_unload); 909 return class_register(&pcmcia_socket_class); 910 } 911 912 static void __exit exit_pcmcia_cs(void) 913 { 914 class_unregister(&pcmcia_socket_class); 915 wait_for_completion(&pcmcia_unload); 916 } 917 918 subsys_initcall(init_pcmcia_cs); 919 module_exit(exit_pcmcia_cs); 920 921