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 65 socket_state_t dead_socket = { 66 .csc_mask = SS_DETECT, 67 }; 68 EXPORT_SYMBOL(dead_socket); 69 70 71 /* List of all sockets, protected by a rwsem */ 72 LIST_HEAD(pcmcia_socket_list); 73 EXPORT_SYMBOL(pcmcia_socket_list); 74 75 DECLARE_RWSEM(pcmcia_socket_list_rwsem); 76 EXPORT_SYMBOL(pcmcia_socket_list_rwsem); 77 78 79 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt) 80 { 81 struct device *dev = get_device(&skt->dev); 82 if (!dev) 83 return NULL; 84 return dev_get_drvdata(dev); 85 } 86 EXPORT_SYMBOL(pcmcia_get_socket); 87 88 89 void pcmcia_put_socket(struct pcmcia_socket *skt) 90 { 91 put_device(&skt->dev); 92 } 93 EXPORT_SYMBOL(pcmcia_put_socket); 94 95 96 static void pcmcia_release_socket(struct device *dev) 97 { 98 struct pcmcia_socket *socket = dev_get_drvdata(dev); 99 100 complete(&socket->socket_released); 101 } 102 103 static int pccardd(void *__skt); 104 105 /** 106 * pcmcia_register_socket - add a new pcmcia socket device 107 * @socket: the &socket to register 108 */ 109 int pcmcia_register_socket(struct pcmcia_socket *socket) 110 { 111 struct task_struct *tsk; 112 int ret; 113 114 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops) 115 return -EINVAL; 116 117 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops); 118 119 /* try to obtain a socket number [yes, it gets ugly if we 120 * register more than 2^sizeof(unsigned int) pcmcia 121 * sockets... but the socket number is deprecated 122 * anyways, so I don't care] */ 123 down_write(&pcmcia_socket_list_rwsem); 124 if (list_empty(&pcmcia_socket_list)) 125 socket->sock = 0; 126 else { 127 unsigned int found, i = 1; 128 struct pcmcia_socket *tmp; 129 do { 130 found = 1; 131 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { 132 if (tmp->sock == i) 133 found = 0; 134 } 135 i++; 136 } while (!found); 137 socket->sock = i - 1; 138 } 139 list_add_tail(&socket->socket_list, &pcmcia_socket_list); 140 up_write(&pcmcia_socket_list_rwsem); 141 142 #ifndef CONFIG_CARDBUS 143 /* 144 * If we do not support Cardbus, ensure that 145 * the Cardbus socket capability is disabled. 146 */ 147 socket->features &= ~SS_CAP_CARDBUS; 148 #endif 149 150 /* set proper values in socket->dev */ 151 dev_set_drvdata(&socket->dev, socket); 152 socket->dev.class = &pcmcia_socket_class; 153 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock); 154 155 /* base address = 0, map = 0 */ 156 socket->cis_mem.flags = 0; 157 socket->cis_mem.speed = cis_speed; 158 159 INIT_LIST_HEAD(&socket->cis_cache); 160 161 init_completion(&socket->socket_released); 162 init_completion(&socket->thread_done); 163 mutex_init(&socket->skt_mutex); 164 mutex_init(&socket->ops_mutex); 165 spin_lock_init(&socket->thread_lock); 166 167 if (socket->resource_ops->init) { 168 mutex_lock(&socket->ops_mutex); 169 ret = socket->resource_ops->init(socket); 170 mutex_unlock(&socket->ops_mutex); 171 if (ret) 172 goto err; 173 } 174 175 tsk = kthread_run(pccardd, socket, "pccardd"); 176 if (IS_ERR(tsk)) { 177 ret = PTR_ERR(tsk); 178 goto err; 179 } 180 181 wait_for_completion(&socket->thread_done); 182 if (!socket->thread) { 183 dev_printk(KERN_WARNING, &socket->dev, 184 "PCMCIA: warning: socket thread did not start\n"); 185 return -EIO; 186 } 187 188 pcmcia_parse_events(socket, SS_DETECT); 189 190 /* 191 * Let's try to get the PCMCIA module for 16-bit PCMCIA support. 192 * If it fails, it doesn't matter -- we still have 32-bit CardBus 193 * support to offer, so this is not a failure mode. 194 */ 195 request_module_nowait("pcmcia"); 196 197 return 0; 198 199 err: 200 down_write(&pcmcia_socket_list_rwsem); 201 list_del(&socket->socket_list); 202 up_write(&pcmcia_socket_list_rwsem); 203 return ret; 204 } /* pcmcia_register_socket */ 205 EXPORT_SYMBOL(pcmcia_register_socket); 206 207 208 /** 209 * pcmcia_unregister_socket - remove a pcmcia socket device 210 * @socket: the &socket to unregister 211 */ 212 void pcmcia_unregister_socket(struct pcmcia_socket *socket) 213 { 214 if (!socket) 215 return; 216 217 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops); 218 219 if (socket->thread) 220 kthread_stop(socket->thread); 221 222 /* remove from our own list */ 223 down_write(&pcmcia_socket_list_rwsem); 224 list_del(&socket->socket_list); 225 up_write(&pcmcia_socket_list_rwsem); 226 227 /* wait for sysfs to drop all references */ 228 if (socket->resource_ops->exit) { 229 mutex_lock(&socket->ops_mutex); 230 socket->resource_ops->exit(socket); 231 mutex_unlock(&socket->ops_mutex); 232 } 233 wait_for_completion(&socket->socket_released); 234 } /* pcmcia_unregister_socket */ 235 EXPORT_SYMBOL(pcmcia_unregister_socket); 236 237 238 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr) 239 { 240 struct pcmcia_socket *s; 241 242 down_read(&pcmcia_socket_list_rwsem); 243 list_for_each_entry(s, &pcmcia_socket_list, socket_list) 244 if (s->sock == nr) { 245 up_read(&pcmcia_socket_list_rwsem); 246 return s; 247 } 248 up_read(&pcmcia_socket_list_rwsem); 249 250 return NULL; 251 252 } 253 EXPORT_SYMBOL(pcmcia_get_socket_by_nr); 254 255 /* 256 * The central event handler. Send_event() sends an event to the 257 * 16-bit subsystem, which then calls the relevant device drivers. 258 * Parse_events() interprets the event bits from 259 * a card status change report. Do_shutdown() handles the high 260 * priority stuff associated with a card removal. 261 */ 262 263 /* NOTE: send_event needs to be called with skt->sem held. */ 264 265 static int send_event(struct pcmcia_socket *s, event_t event, int priority) 266 { 267 int ret; 268 269 if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL)) 270 return 0; 271 272 dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n", 273 event, priority, s->callback); 274 275 if (!s->callback) 276 return 0; 277 if (!try_module_get(s->callback->owner)) 278 return 0; 279 280 ret = s->callback->event(s, event, priority); 281 282 module_put(s->callback->owner); 283 284 return ret; 285 } 286 287 static int socket_reset(struct pcmcia_socket *skt) 288 { 289 int status, i; 290 291 dev_dbg(&skt->dev, "reset\n"); 292 293 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; 294 skt->ops->set_socket(skt, &skt->socket); 295 udelay((long)reset_time); 296 297 skt->socket.flags &= ~SS_RESET; 298 skt->ops->set_socket(skt, &skt->socket); 299 300 msleep(unreset_delay * 10); 301 for (i = 0; i < unreset_limit; i++) { 302 skt->ops->get_status(skt, &status); 303 304 if (!(status & SS_DETECT)) 305 return -ENODEV; 306 307 if (status & SS_READY) 308 return 0; 309 310 msleep(unreset_check * 10); 311 } 312 313 dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n"); 314 return -ETIMEDOUT; 315 } 316 317 /* 318 * socket_setup() and socket_shutdown() are called by the main event handler 319 * when card insertion and removal events are received. 320 * socket_setup() turns on socket power and resets the socket, in two stages. 321 * socket_shutdown() unconfigures a socket and turns off socket power. 322 */ 323 static void socket_shutdown(struct pcmcia_socket *s) 324 { 325 int status; 326 327 dev_dbg(&s->dev, "shutdown\n"); 328 329 send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH); 330 331 mutex_lock(&s->ops_mutex); 332 s->state &= SOCKET_INUSE | SOCKET_PRESENT; 333 msleep(shutdown_delay * 10); 334 s->state &= SOCKET_INUSE; 335 336 /* Blank out the socket state */ 337 s->socket = dead_socket; 338 s->ops->init(s); 339 s->ops->set_socket(s, &s->socket); 340 s->irq.AssignedIRQ = s->irq.Config = 0; 341 s->lock_count = 0; 342 kfree(s->fake_cis); 343 s->fake_cis = NULL; 344 s->functions = 0; 345 346 /* From here on we can be sure that only we (that is, the 347 * pccardd thread) accesses this socket, and all (16-bit) 348 * PCMCIA interactions are gone. Therefore, release 349 * ops_mutex so that we don't get a sysfs-related lockdep 350 * warning. 351 */ 352 mutex_unlock(&s->ops_mutex); 353 354 #ifdef CONFIG_CARDBUS 355 cb_free(s); 356 #endif 357 358 /* give socket some time to power down */ 359 msleep(100); 360 361 s->ops->get_status(s, &status); 362 if (status & SS_POWERON) { 363 dev_printk(KERN_ERR, &s->dev, 364 "*** DANGER *** unable to remove socket power\n"); 365 } 366 367 s->state &= ~SOCKET_INUSE; 368 } 369 370 static int socket_setup(struct pcmcia_socket *skt, int initial_delay) 371 { 372 int status, i; 373 374 dev_dbg(&skt->dev, "setup\n"); 375 376 skt->ops->get_status(skt, &status); 377 if (!(status & SS_DETECT)) 378 return -ENODEV; 379 380 msleep(initial_delay * 10); 381 382 for (i = 0; i < 100; i++) { 383 skt->ops->get_status(skt, &status); 384 if (!(status & SS_DETECT)) 385 return -ENODEV; 386 387 if (!(status & SS_PENDING)) 388 break; 389 390 msleep(100); 391 } 392 393 if (status & SS_PENDING) { 394 dev_printk(KERN_ERR, &skt->dev, 395 "voltage interrogation timed out.\n"); 396 return -ETIMEDOUT; 397 } 398 399 if (status & SS_CARDBUS) { 400 if (!(skt->features & SS_CAP_CARDBUS)) { 401 dev_printk(KERN_ERR, &skt->dev, 402 "cardbus cards are not supported.\n"); 403 return -EINVAL; 404 } 405 skt->state |= SOCKET_CARDBUS; 406 } else 407 skt->state &= ~SOCKET_CARDBUS; 408 409 /* 410 * Decode the card voltage requirements, and apply power to the card. 411 */ 412 if (status & SS_3VCARD) 413 skt->socket.Vcc = skt->socket.Vpp = 33; 414 else if (!(status & SS_XVCARD)) 415 skt->socket.Vcc = skt->socket.Vpp = 50; 416 else { 417 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n"); 418 return -EIO; 419 } 420 421 if (skt->power_hook) 422 skt->power_hook(skt, HOOK_POWER_PRE); 423 424 skt->socket.flags = 0; 425 skt->ops->set_socket(skt, &skt->socket); 426 427 /* 428 * Wait "vcc_settle" for the supply to stabilise. 429 */ 430 msleep(vcc_settle * 10); 431 432 skt->ops->get_status(skt, &status); 433 if (!(status & SS_POWERON)) { 434 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n"); 435 return -EIO; 436 } 437 438 status = socket_reset(skt); 439 440 if (skt->power_hook) 441 skt->power_hook(skt, HOOK_POWER_POST); 442 443 return status; 444 } 445 446 /* 447 * Handle card insertion. Setup the socket, reset the card, 448 * and then tell the rest of PCMCIA that a card is present. 449 */ 450 static int socket_insert(struct pcmcia_socket *skt) 451 { 452 int ret; 453 454 dev_dbg(&skt->dev, "insert\n"); 455 456 mutex_lock(&skt->ops_mutex); 457 if (skt->state & SOCKET_INUSE) { 458 mutex_unlock(&skt->ops_mutex); 459 return -EINVAL; 460 } 461 skt->state |= SOCKET_INUSE; 462 463 ret = socket_setup(skt, setup_delay); 464 if (ret == 0) { 465 skt->state |= SOCKET_PRESENT; 466 467 dev_printk(KERN_NOTICE, &skt->dev, 468 "pccard: %s card inserted into slot %d\n", 469 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 470 skt->sock); 471 472 #ifdef CONFIG_CARDBUS 473 if (skt->state & SOCKET_CARDBUS) { 474 cb_alloc(skt); 475 skt->state |= SOCKET_CARDBUS_CONFIG; 476 } 477 #endif 478 dev_dbg(&skt->dev, "insert done\n"); 479 mutex_unlock(&skt->ops_mutex); 480 481 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 482 } else { 483 mutex_unlock(&skt->ops_mutex); 484 socket_shutdown(skt); 485 } 486 487 return ret; 488 } 489 490 static int socket_suspend(struct pcmcia_socket *skt) 491 { 492 if (skt->state & SOCKET_SUSPEND) 493 return -EBUSY; 494 495 mutex_lock(&skt->ops_mutex); 496 skt->suspended_state = skt->state; 497 498 send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); 499 skt->socket = dead_socket; 500 skt->ops->set_socket(skt, &skt->socket); 501 if (skt->ops->suspend) 502 skt->ops->suspend(skt); 503 skt->state |= SOCKET_SUSPEND; 504 mutex_unlock(&skt->ops_mutex); 505 return 0; 506 } 507 508 static int socket_early_resume(struct pcmcia_socket *skt) 509 { 510 mutex_lock(&skt->ops_mutex); 511 skt->socket = dead_socket; 512 skt->ops->init(skt); 513 skt->ops->set_socket(skt, &skt->socket); 514 if (skt->state & SOCKET_PRESENT) 515 skt->resume_status = socket_setup(skt, resume_delay); 516 mutex_unlock(&skt->ops_mutex); 517 return 0; 518 } 519 520 static int socket_late_resume(struct pcmcia_socket *skt) 521 { 522 int ret; 523 524 mutex_lock(&skt->ops_mutex); 525 skt->state &= ~SOCKET_SUSPEND; 526 mutex_unlock(&skt->ops_mutex); 527 528 if (!(skt->state & SOCKET_PRESENT)) { 529 ret = socket_insert(skt); 530 if (ret == -ENODEV) 531 ret = 0; 532 return ret; 533 } 534 535 if (skt->resume_status) { 536 socket_shutdown(skt); 537 return 0; 538 } 539 540 if (skt->suspended_state != skt->state) { 541 dev_dbg(&skt->dev, 542 "suspend state 0x%x != resume state 0x%x\n", 543 skt->suspended_state, skt->state); 544 545 socket_shutdown(skt); 546 return socket_insert(skt); 547 } 548 549 #ifdef CONFIG_CARDBUS 550 if (skt->state & SOCKET_CARDBUS) { 551 /* We can't be sure the CardBus card is the same 552 * as the one previously inserted. Therefore, remove 553 * and re-add... */ 554 cb_free(skt); 555 cb_alloc(skt); 556 return 0; 557 } 558 #endif 559 560 send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); 561 return 0; 562 } 563 564 /* 565 * Resume a socket. If a card is present, verify its CIS against 566 * our cached copy. If they are different, the card has been 567 * replaced, and we need to tell the drivers. 568 */ 569 static int socket_resume(struct pcmcia_socket *skt) 570 { 571 if (!(skt->state & SOCKET_SUSPEND)) 572 return -EBUSY; 573 574 socket_early_resume(skt); 575 return socket_late_resume(skt); 576 } 577 578 static void socket_remove(struct pcmcia_socket *skt) 579 { 580 dev_printk(KERN_NOTICE, &skt->dev, 581 "pccard: card ejected from slot %d\n", skt->sock); 582 socket_shutdown(skt); 583 } 584 585 /* 586 * Process a socket card detect status change. 587 * 588 * If we don't have a card already present, delay the detect event for 589 * about 20ms (to be on the safe side) before reading the socket status. 590 * 591 * Some i82365-based systems send multiple SS_DETECT events during card 592 * insertion, and the "card present" status bit seems to bounce. This 593 * will probably be true with GPIO-based card detection systems after 594 * the product has aged. 595 */ 596 static void socket_detect_change(struct pcmcia_socket *skt) 597 { 598 if (!(skt->state & SOCKET_SUSPEND)) { 599 int status; 600 601 if (!(skt->state & SOCKET_PRESENT)) 602 msleep(20); 603 604 skt->ops->get_status(skt, &status); 605 if ((skt->state & SOCKET_PRESENT) && 606 !(status & SS_DETECT)) 607 socket_remove(skt); 608 if (!(skt->state & SOCKET_PRESENT) && 609 (status & SS_DETECT)) 610 socket_insert(skt); 611 } 612 } 613 614 static int pccardd(void *__skt) 615 { 616 struct pcmcia_socket *skt = __skt; 617 int ret; 618 619 skt->thread = current; 620 skt->socket = dead_socket; 621 skt->ops->init(skt); 622 skt->ops->set_socket(skt, &skt->socket); 623 624 /* register with the device core */ 625 ret = device_register(&skt->dev); 626 if (ret) { 627 dev_printk(KERN_WARNING, &skt->dev, 628 "PCMCIA: unable to register socket\n"); 629 skt->thread = NULL; 630 complete(&skt->thread_done); 631 return 0; 632 } 633 ret = pccard_sysfs_add_socket(&skt->dev); 634 if (ret) 635 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); 636 637 complete(&skt->thread_done); 638 639 /* wait for userspace to catch up */ 640 msleep(250); 641 642 set_freezable(); 643 for (;;) { 644 unsigned long flags; 645 unsigned int events; 646 unsigned int sysfs_events; 647 648 set_current_state(TASK_INTERRUPTIBLE); 649 650 spin_lock_irqsave(&skt->thread_lock, flags); 651 events = skt->thread_events; 652 skt->thread_events = 0; 653 sysfs_events = skt->sysfs_events; 654 skt->sysfs_events = 0; 655 spin_unlock_irqrestore(&skt->thread_lock, flags); 656 657 mutex_lock(&skt->skt_mutex); 658 if (events) { 659 if (events & SS_DETECT) 660 socket_detect_change(skt); 661 if (events & SS_BATDEAD) 662 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); 663 if (events & SS_BATWARN) 664 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); 665 if (events & SS_READY) 666 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); 667 } 668 669 if (sysfs_events) { 670 if (sysfs_events & PCMCIA_UEVENT_EJECT) 671 socket_remove(skt); 672 if (sysfs_events & PCMCIA_UEVENT_INSERT) 673 socket_insert(skt); 674 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) && 675 !(skt->state & SOCKET_CARDBUS)) { 676 if (skt->callback) 677 ret = skt->callback->suspend(skt); 678 else 679 ret = 0; 680 if (!ret) { 681 socket_suspend(skt); 682 msleep(100); 683 } 684 } 685 if ((sysfs_events & PCMCIA_UEVENT_RESUME) && 686 !(skt->state & SOCKET_CARDBUS)) { 687 ret = socket_resume(skt); 688 if (!ret && skt->callback) 689 skt->callback->resume(skt); 690 } 691 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) && 692 !(skt->state & SOCKET_CARDBUS)) { 693 if (!ret && skt->callback) 694 skt->callback->requery(skt); 695 } 696 } 697 mutex_unlock(&skt->skt_mutex); 698 699 if (events || sysfs_events) 700 continue; 701 702 if (kthread_should_stop()) 703 break; 704 705 schedule(); 706 try_to_freeze(); 707 } 708 /* make sure we are running before we exit */ 709 set_current_state(TASK_RUNNING); 710 711 /* shut down socket, if a device is still present */ 712 if (skt->state & SOCKET_PRESENT) { 713 mutex_lock(&skt->skt_mutex); 714 socket_remove(skt); 715 mutex_unlock(&skt->skt_mutex); 716 } 717 718 /* remove from the device core */ 719 pccard_sysfs_remove_socket(&skt->dev); 720 device_unregister(&skt->dev); 721 722 return 0; 723 } 724 725 /* 726 * Yenta (at least) probes interrupts before registering the socket and 727 * starting the handler thread. 728 */ 729 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) 730 { 731 unsigned long flags; 732 dev_dbg(&s->dev, "parse_events: events %08x\n", events); 733 if (s->thread) { 734 spin_lock_irqsave(&s->thread_lock, flags); 735 s->thread_events |= events; 736 spin_unlock_irqrestore(&s->thread_lock, flags); 737 738 wake_up_process(s->thread); 739 } 740 } /* pcmcia_parse_events */ 741 EXPORT_SYMBOL(pcmcia_parse_events); 742 743 /** 744 * pcmcia_parse_uevents() - tell pccardd to issue manual commands 745 * @s: the PCMCIA socket we wan't to command 746 * @events: events to pass to pccardd 747 * 748 * userspace-issued insert, eject, suspend and resume commands must be 749 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events 750 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert), 751 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend) 752 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card). 753 */ 754 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events) 755 { 756 unsigned long flags; 757 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events); 758 if (s->thread) { 759 spin_lock_irqsave(&s->thread_lock, flags); 760 s->sysfs_events |= events; 761 spin_unlock_irqrestore(&s->thread_lock, flags); 762 763 wake_up_process(s->thread); 764 } 765 } 766 EXPORT_SYMBOL(pcmcia_parse_uevents); 767 768 769 /* register pcmcia_callback */ 770 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 771 { 772 int ret = 0; 773 774 /* s->skt_mutex also protects s->callback */ 775 mutex_lock(&s->skt_mutex); 776 777 if (c) { 778 /* registration */ 779 if (s->callback) { 780 ret = -EBUSY; 781 goto err; 782 } 783 784 s->callback = c; 785 786 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 787 send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 788 } else 789 s->callback = NULL; 790 err: 791 mutex_unlock(&s->skt_mutex); 792 793 return ret; 794 } 795 EXPORT_SYMBOL(pccard_register_pcmcia); 796 797 798 /* I'm not sure which "reset" function this is supposed to use, 799 * but for now, it uses the low-level interface's reset, not the 800 * CIS register. 801 */ 802 803 int pcmcia_reset_card(struct pcmcia_socket *skt) 804 { 805 int ret; 806 807 dev_dbg(&skt->dev, "resetting socket\n"); 808 809 mutex_lock(&skt->skt_mutex); 810 do { 811 if (!(skt->state & SOCKET_PRESENT)) { 812 dev_dbg(&skt->dev, "can't reset, not present\n"); 813 ret = -ENODEV; 814 break; 815 } 816 if (skt->state & SOCKET_SUSPEND) { 817 dev_dbg(&skt->dev, "can't reset, suspended\n"); 818 ret = -EBUSY; 819 break; 820 } 821 if (skt->state & SOCKET_CARDBUS) { 822 dev_dbg(&skt->dev, "can't reset, is cardbus\n"); 823 ret = -EPERM; 824 break; 825 } 826 827 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); 828 if (ret == 0) { 829 send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); 830 if (skt->callback) 831 skt->callback->suspend(skt); 832 mutex_lock(&skt->ops_mutex); 833 ret = socket_reset(skt); 834 mutex_unlock(&skt->ops_mutex); 835 if (ret == 0) { 836 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); 837 if (skt->callback) 838 skt->callback->resume(skt); 839 } 840 } 841 842 ret = 0; 843 } while (0); 844 mutex_unlock(&skt->skt_mutex); 845 846 return ret; 847 } /* reset_card */ 848 EXPORT_SYMBOL(pcmcia_reset_card); 849 850 851 static int pcmcia_socket_uevent(struct device *dev, 852 struct kobj_uevent_env *env) 853 { 854 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 855 856 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) 857 return -ENOMEM; 858 859 return 0; 860 } 861 862 863 static struct completion pcmcia_unload; 864 865 static void pcmcia_release_socket_class(struct class *data) 866 { 867 complete(&pcmcia_unload); 868 } 869 870 871 #ifdef CONFIG_PM 872 873 static int __pcmcia_pm_op(struct device *dev, 874 int (*callback) (struct pcmcia_socket *skt)) 875 { 876 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 877 int ret; 878 879 mutex_lock(&s->skt_mutex); 880 ret = callback(s); 881 mutex_unlock(&s->skt_mutex); 882 883 return ret; 884 } 885 886 static int pcmcia_socket_dev_suspend_noirq(struct device *dev) 887 { 888 return __pcmcia_pm_op(dev, socket_suspend); 889 } 890 891 static int pcmcia_socket_dev_resume_noirq(struct device *dev) 892 { 893 return __pcmcia_pm_op(dev, socket_early_resume); 894 } 895 896 static int pcmcia_socket_dev_resume(struct device *dev) 897 { 898 return __pcmcia_pm_op(dev, socket_late_resume); 899 } 900 901 static const struct dev_pm_ops pcmcia_socket_pm_ops = { 902 /* dev_resume may be called with IRQs enabled */ 903 SET_SYSTEM_SLEEP_PM_OPS(NULL, 904 pcmcia_socket_dev_resume) 905 906 /* late suspend must be called with IRQs disabled */ 907 .suspend_noirq = pcmcia_socket_dev_suspend_noirq, 908 .freeze_noirq = pcmcia_socket_dev_suspend_noirq, 909 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq, 910 911 /* early resume must be called with IRQs disabled */ 912 .resume_noirq = pcmcia_socket_dev_resume_noirq, 913 .thaw_noirq = pcmcia_socket_dev_resume_noirq, 914 .restore_noirq = pcmcia_socket_dev_resume_noirq, 915 }; 916 917 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops) 918 919 #else /* CONFIG_PM */ 920 921 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL 922 923 #endif /* CONFIG_PM */ 924 925 struct class pcmcia_socket_class = { 926 .name = "pcmcia_socket", 927 .dev_uevent = pcmcia_socket_uevent, 928 .dev_release = pcmcia_release_socket, 929 .class_release = pcmcia_release_socket_class, 930 .pm = PCMCIA_SOCKET_CLASS_PM_OPS, 931 }; 932 EXPORT_SYMBOL(pcmcia_socket_class); 933 934 935 static int __init init_pcmcia_cs(void) 936 { 937 init_completion(&pcmcia_unload); 938 return class_register(&pcmcia_socket_class); 939 } 940 941 static void __exit exit_pcmcia_cs(void) 942 { 943 class_unregister(&pcmcia_socket_class); 944 wait_for_completion(&pcmcia_unload); 945 } 946 947 subsys_initcall(init_pcmcia_cs); 948 module_exit(exit_pcmcia_cs); 949 950