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_printk(KERN_WARNING, &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_printk(KERN_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_printk(KERN_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_printk(KERN_ERR, &skt->dev, 360 "voltage interrogation timed out.\n"); 361 return -ETIMEDOUT; 362 } 363 364 if (status & SS_CARDBUS) { 365 if (!(skt->features & SS_CAP_CARDBUS)) { 366 dev_printk(KERN_ERR, &skt->dev, 367 "cardbus cards are not supported.\n"); 368 return -EINVAL; 369 } 370 skt->state |= SOCKET_CARDBUS; 371 } else 372 skt->state &= ~SOCKET_CARDBUS; 373 374 /* 375 * Decode the card voltage requirements, and apply power to the card. 376 */ 377 if (status & SS_3VCARD) 378 skt->socket.Vcc = skt->socket.Vpp = 33; 379 else if (!(status & SS_XVCARD)) 380 skt->socket.Vcc = skt->socket.Vpp = 50; 381 else { 382 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n"); 383 return -EIO; 384 } 385 386 if (skt->power_hook) 387 skt->power_hook(skt, HOOK_POWER_PRE); 388 389 skt->socket.flags = 0; 390 skt->ops->set_socket(skt, &skt->socket); 391 392 /* 393 * Wait "vcc_settle" for the supply to stabilise. 394 */ 395 msleep(vcc_settle * 10); 396 397 skt->ops->get_status(skt, &status); 398 if (!(status & SS_POWERON)) { 399 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n"); 400 return -EIO; 401 } 402 403 status = socket_reset(skt); 404 405 if (skt->power_hook) 406 skt->power_hook(skt, HOOK_POWER_POST); 407 408 return status; 409 } 410 411 /* 412 * Handle card insertion. Setup the socket, reset the card, 413 * and then tell the rest of PCMCIA that a card is present. 414 */ 415 static int socket_insert(struct pcmcia_socket *skt) 416 { 417 int ret; 418 419 dev_dbg(&skt->dev, "insert\n"); 420 421 mutex_lock(&skt->ops_mutex); 422 if (skt->state & SOCKET_INUSE) { 423 mutex_unlock(&skt->ops_mutex); 424 return -EINVAL; 425 } 426 skt->state |= SOCKET_INUSE; 427 428 ret = socket_setup(skt, setup_delay); 429 if (ret == 0) { 430 skt->state |= SOCKET_PRESENT; 431 432 dev_printk(KERN_NOTICE, &skt->dev, 433 "pccard: %s card inserted into slot %d\n", 434 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 435 skt->sock); 436 437 #ifdef CONFIG_CARDBUS 438 if (skt->state & SOCKET_CARDBUS) { 439 cb_alloc(skt); 440 skt->state |= SOCKET_CARDBUS_CONFIG; 441 } 442 #endif 443 dev_dbg(&skt->dev, "insert done\n"); 444 mutex_unlock(&skt->ops_mutex); 445 446 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) 447 skt->callback->add(skt); 448 } else { 449 mutex_unlock(&skt->ops_mutex); 450 socket_shutdown(skt); 451 } 452 453 return ret; 454 } 455 456 static int socket_suspend(struct pcmcia_socket *skt) 457 { 458 if (skt->state & SOCKET_SUSPEND) 459 return -EBUSY; 460 461 mutex_lock(&skt->ops_mutex); 462 skt->suspended_state = skt->state; 463 464 skt->socket = dead_socket; 465 skt->ops->set_socket(skt, &skt->socket); 466 if (skt->ops->suspend) 467 skt->ops->suspend(skt); 468 skt->state |= SOCKET_SUSPEND; 469 mutex_unlock(&skt->ops_mutex); 470 return 0; 471 } 472 473 static int socket_early_resume(struct pcmcia_socket *skt) 474 { 475 mutex_lock(&skt->ops_mutex); 476 skt->socket = dead_socket; 477 skt->ops->init(skt); 478 skt->ops->set_socket(skt, &skt->socket); 479 if (skt->state & SOCKET_PRESENT) 480 skt->resume_status = socket_setup(skt, resume_delay); 481 mutex_unlock(&skt->ops_mutex); 482 return 0; 483 } 484 485 static int socket_late_resume(struct pcmcia_socket *skt) 486 { 487 int ret = 0; 488 489 mutex_lock(&skt->ops_mutex); 490 skt->state &= ~SOCKET_SUSPEND; 491 mutex_unlock(&skt->ops_mutex); 492 493 if (!(skt->state & SOCKET_PRESENT)) { 494 ret = socket_insert(skt); 495 if (ret == -ENODEV) 496 ret = 0; 497 return ret; 498 } 499 500 if (skt->resume_status) { 501 socket_shutdown(skt); 502 return 0; 503 } 504 505 if (skt->suspended_state != skt->state) { 506 dev_dbg(&skt->dev, 507 "suspend state 0x%x != resume state 0x%x\n", 508 skt->suspended_state, skt->state); 509 510 socket_shutdown(skt); 511 return socket_insert(skt); 512 } 513 514 if (!(skt->state & SOCKET_CARDBUS) && (skt->callback)) 515 ret = skt->callback->early_resume(skt); 516 return ret; 517 } 518 519 /* 520 * Finalize the resume. In case of a cardbus socket, we have 521 * to rebind the devices as we can't be certain that it has been 522 * replaced, or not. 523 */ 524 static int socket_complete_resume(struct pcmcia_socket *skt) 525 { 526 int ret = 0; 527 #ifdef CONFIG_CARDBUS 528 if (skt->state & SOCKET_CARDBUS) { 529 /* We can't be sure the CardBus card is the same 530 * as the one previously inserted. Therefore, remove 531 * and re-add... */ 532 cb_free(skt); 533 ret = cb_alloc(skt); 534 if (ret) 535 cb_free(skt); 536 } 537 #endif 538 return ret; 539 } 540 541 /* 542 * Resume a socket. If a card is present, verify its CIS against 543 * our cached copy. If they are different, the card has been 544 * replaced, and we need to tell the drivers. 545 */ 546 static int socket_resume(struct pcmcia_socket *skt) 547 { 548 int err; 549 if (!(skt->state & SOCKET_SUSPEND)) 550 return -EBUSY; 551 552 socket_early_resume(skt); 553 err = socket_late_resume(skt); 554 if (!err) 555 err = socket_complete_resume(skt); 556 return err; 557 } 558 559 static void socket_remove(struct pcmcia_socket *skt) 560 { 561 dev_printk(KERN_NOTICE, &skt->dev, 562 "pccard: card ejected from slot %d\n", skt->sock); 563 socket_shutdown(skt); 564 } 565 566 /* 567 * Process a socket card detect status change. 568 * 569 * If we don't have a card already present, delay the detect event for 570 * about 20ms (to be on the safe side) before reading the socket status. 571 * 572 * Some i82365-based systems send multiple SS_DETECT events during card 573 * insertion, and the "card present" status bit seems to bounce. This 574 * will probably be true with GPIO-based card detection systems after 575 * the product has aged. 576 */ 577 static void socket_detect_change(struct pcmcia_socket *skt) 578 { 579 if (!(skt->state & SOCKET_SUSPEND)) { 580 int status; 581 582 if (!(skt->state & SOCKET_PRESENT)) 583 msleep(20); 584 585 skt->ops->get_status(skt, &status); 586 if ((skt->state & SOCKET_PRESENT) && 587 !(status & SS_DETECT)) 588 socket_remove(skt); 589 if (!(skt->state & SOCKET_PRESENT) && 590 (status & SS_DETECT)) 591 socket_insert(skt); 592 } 593 } 594 595 static int pccardd(void *__skt) 596 { 597 struct pcmcia_socket *skt = __skt; 598 int ret; 599 600 skt->thread = current; 601 skt->socket = dead_socket; 602 skt->ops->init(skt); 603 skt->ops->set_socket(skt, &skt->socket); 604 605 /* register with the device core */ 606 ret = device_register(&skt->dev); 607 if (ret) { 608 dev_printk(KERN_WARNING, &skt->dev, 609 "PCMCIA: unable to register socket\n"); 610 skt->thread = NULL; 611 complete(&skt->thread_done); 612 return 0; 613 } 614 ret = pccard_sysfs_add_socket(&skt->dev); 615 if (ret) 616 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); 617 618 complete(&skt->thread_done); 619 620 /* wait for userspace to catch up */ 621 msleep(250); 622 623 set_freezable(); 624 for (;;) { 625 unsigned long flags; 626 unsigned int events; 627 unsigned int sysfs_events; 628 629 set_current_state(TASK_INTERRUPTIBLE); 630 631 spin_lock_irqsave(&skt->thread_lock, flags); 632 events = skt->thread_events; 633 skt->thread_events = 0; 634 sysfs_events = skt->sysfs_events; 635 skt->sysfs_events = 0; 636 spin_unlock_irqrestore(&skt->thread_lock, flags); 637 638 mutex_lock(&skt->skt_mutex); 639 if (events & SS_DETECT) 640 socket_detect_change(skt); 641 642 if (sysfs_events) { 643 if (sysfs_events & PCMCIA_UEVENT_EJECT) 644 socket_remove(skt); 645 if (sysfs_events & PCMCIA_UEVENT_INSERT) 646 socket_insert(skt); 647 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) && 648 !(skt->state & SOCKET_CARDBUS)) { 649 if (skt->callback) 650 ret = skt->callback->suspend(skt); 651 else 652 ret = 0; 653 if (!ret) { 654 socket_suspend(skt); 655 msleep(100); 656 } 657 } 658 if ((sysfs_events & PCMCIA_UEVENT_RESUME) && 659 !(skt->state & SOCKET_CARDBUS)) { 660 ret = socket_resume(skt); 661 if (!ret && skt->callback) 662 skt->callback->resume(skt); 663 } 664 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) && 665 !(skt->state & SOCKET_CARDBUS)) { 666 if (!ret && skt->callback) 667 skt->callback->requery(skt); 668 } 669 } 670 mutex_unlock(&skt->skt_mutex); 671 672 if (events || sysfs_events) 673 continue; 674 675 if (kthread_should_stop()) 676 break; 677 678 schedule(); 679 try_to_freeze(); 680 } 681 /* make sure we are running before we exit */ 682 set_current_state(TASK_RUNNING); 683 684 /* shut down socket, if a device is still present */ 685 if (skt->state & SOCKET_PRESENT) { 686 mutex_lock(&skt->skt_mutex); 687 socket_remove(skt); 688 mutex_unlock(&skt->skt_mutex); 689 } 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 dev_dbg(&s->dev, "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 * pcmcia_parse_uevents() - tell pccardd to issue manual commands 718 * @s: the PCMCIA socket we wan't to command 719 * @events: events to pass to pccardd 720 * 721 * userspace-issued insert, eject, suspend and resume commands must be 722 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events 723 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert), 724 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend) 725 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card). 726 */ 727 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events) 728 { 729 unsigned long flags; 730 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events); 731 if (s->thread) { 732 spin_lock_irqsave(&s->thread_lock, flags); 733 s->sysfs_events |= events; 734 spin_unlock_irqrestore(&s->thread_lock, flags); 735 736 wake_up_process(s->thread); 737 } 738 } 739 EXPORT_SYMBOL(pcmcia_parse_uevents); 740 741 742 /* register pcmcia_callback */ 743 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 744 { 745 int ret = 0; 746 747 /* s->skt_mutex also protects s->callback */ 748 mutex_lock(&s->skt_mutex); 749 750 if (c) { 751 /* registration */ 752 if (s->callback) { 753 ret = -EBUSY; 754 goto err; 755 } 756 757 s->callback = c; 758 759 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 760 s->callback->add(s); 761 } else 762 s->callback = NULL; 763 err: 764 mutex_unlock(&s->skt_mutex); 765 766 return ret; 767 } 768 EXPORT_SYMBOL(pccard_register_pcmcia); 769 770 771 /* I'm not sure which "reset" function this is supposed to use, 772 * but for now, it uses the low-level interface's reset, not the 773 * CIS register. 774 */ 775 776 int pcmcia_reset_card(struct pcmcia_socket *skt) 777 { 778 int ret; 779 780 dev_dbg(&skt->dev, "resetting socket\n"); 781 782 mutex_lock(&skt->skt_mutex); 783 do { 784 if (!(skt->state & SOCKET_PRESENT)) { 785 dev_dbg(&skt->dev, "can't reset, not present\n"); 786 ret = -ENODEV; 787 break; 788 } 789 if (skt->state & SOCKET_SUSPEND) { 790 dev_dbg(&skt->dev, "can't reset, suspended\n"); 791 ret = -EBUSY; 792 break; 793 } 794 if (skt->state & SOCKET_CARDBUS) { 795 dev_dbg(&skt->dev, "can't reset, is cardbus\n"); 796 ret = -EPERM; 797 break; 798 } 799 800 if (skt->callback) 801 skt->callback->suspend(skt); 802 mutex_lock(&skt->ops_mutex); 803 ret = socket_reset(skt); 804 mutex_unlock(&skt->ops_mutex); 805 if ((ret == 0) && (skt->callback)) 806 skt->callback->resume(skt); 807 808 ret = 0; 809 } while (0); 810 mutex_unlock(&skt->skt_mutex); 811 812 return ret; 813 } /* reset_card */ 814 EXPORT_SYMBOL(pcmcia_reset_card); 815 816 817 static int pcmcia_socket_uevent(struct device *dev, 818 struct kobj_uevent_env *env) 819 { 820 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 821 822 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) 823 return -ENOMEM; 824 825 return 0; 826 } 827 828 829 static struct completion pcmcia_unload; 830 831 static void pcmcia_release_socket_class(struct class *data) 832 { 833 complete(&pcmcia_unload); 834 } 835 836 837 #ifdef CONFIG_PM 838 839 static int __pcmcia_pm_op(struct device *dev, 840 int (*callback) (struct pcmcia_socket *skt)) 841 { 842 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 843 int ret; 844 845 mutex_lock(&s->skt_mutex); 846 ret = callback(s); 847 mutex_unlock(&s->skt_mutex); 848 849 return ret; 850 } 851 852 static int pcmcia_socket_dev_suspend_noirq(struct device *dev) 853 { 854 return __pcmcia_pm_op(dev, socket_suspend); 855 } 856 857 static int pcmcia_socket_dev_resume_noirq(struct device *dev) 858 { 859 return __pcmcia_pm_op(dev, socket_early_resume); 860 } 861 862 static int __used pcmcia_socket_dev_resume(struct device *dev) 863 { 864 return __pcmcia_pm_op(dev, socket_late_resume); 865 } 866 867 static void __used pcmcia_socket_dev_complete(struct device *dev) 868 { 869 WARN(__pcmcia_pm_op(dev, socket_complete_resume), 870 "failed to complete resume"); 871 } 872 873 static const struct dev_pm_ops pcmcia_socket_pm_ops = { 874 /* dev_resume may be called with IRQs enabled */ 875 SET_SYSTEM_SLEEP_PM_OPS(NULL, 876 pcmcia_socket_dev_resume) 877 878 /* late suspend must be called with IRQs disabled */ 879 .suspend_noirq = pcmcia_socket_dev_suspend_noirq, 880 .freeze_noirq = pcmcia_socket_dev_suspend_noirq, 881 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq, 882 883 /* early resume must be called with IRQs disabled */ 884 .resume_noirq = pcmcia_socket_dev_resume_noirq, 885 .thaw_noirq = pcmcia_socket_dev_resume_noirq, 886 .restore_noirq = pcmcia_socket_dev_resume_noirq, 887 .complete = pcmcia_socket_dev_complete, 888 }; 889 890 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops) 891 892 #else /* CONFIG_PM */ 893 894 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL 895 896 #endif /* CONFIG_PM */ 897 898 struct class pcmcia_socket_class = { 899 .name = "pcmcia_socket", 900 .dev_uevent = pcmcia_socket_uevent, 901 .dev_release = pcmcia_release_socket, 902 .class_release = pcmcia_release_socket_class, 903 .pm = PCMCIA_SOCKET_CLASS_PM_OPS, 904 }; 905 EXPORT_SYMBOL(pcmcia_socket_class); 906 907 908 static int __init init_pcmcia_cs(void) 909 { 910 init_completion(&pcmcia_unload); 911 return class_register(&pcmcia_socket_class); 912 } 913 914 static void __exit exit_pcmcia_cs(void) 915 { 916 class_unregister(&pcmcia_socket_class); 917 wait_for_completion(&pcmcia_unload); 918 } 919 920 subsys_initcall(init_pcmcia_cs); 921 module_exit(exit_pcmcia_cs); 922 923