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->lock_count = 0; 341 kfree(s->fake_cis); 342 s->fake_cis = NULL; 343 s->functions = 0; 344 345 /* From here on we can be sure that only we (that is, the 346 * pccardd thread) accesses this socket, and all (16-bit) 347 * PCMCIA interactions are gone. Therefore, release 348 * ops_mutex so that we don't get a sysfs-related lockdep 349 * warning. 350 */ 351 mutex_unlock(&s->ops_mutex); 352 353 #ifdef CONFIG_CARDBUS 354 cb_free(s); 355 #endif 356 357 /* give socket some time to power down */ 358 msleep(100); 359 360 s->ops->get_status(s, &status); 361 if (status & SS_POWERON) { 362 dev_printk(KERN_ERR, &s->dev, 363 "*** DANGER *** unable to remove socket power\n"); 364 } 365 366 s->state &= ~SOCKET_INUSE; 367 } 368 369 static int socket_setup(struct pcmcia_socket *skt, int initial_delay) 370 { 371 int status, i; 372 373 dev_dbg(&skt->dev, "setup\n"); 374 375 skt->ops->get_status(skt, &status); 376 if (!(status & SS_DETECT)) 377 return -ENODEV; 378 379 msleep(initial_delay * 10); 380 381 for (i = 0; i < 100; i++) { 382 skt->ops->get_status(skt, &status); 383 if (!(status & SS_DETECT)) 384 return -ENODEV; 385 386 if (!(status & SS_PENDING)) 387 break; 388 389 msleep(100); 390 } 391 392 if (status & SS_PENDING) { 393 dev_printk(KERN_ERR, &skt->dev, 394 "voltage interrogation timed out.\n"); 395 return -ETIMEDOUT; 396 } 397 398 if (status & SS_CARDBUS) { 399 if (!(skt->features & SS_CAP_CARDBUS)) { 400 dev_printk(KERN_ERR, &skt->dev, 401 "cardbus cards are not supported.\n"); 402 return -EINVAL; 403 } 404 skt->state |= SOCKET_CARDBUS; 405 } else 406 skt->state &= ~SOCKET_CARDBUS; 407 408 /* 409 * Decode the card voltage requirements, and apply power to the card. 410 */ 411 if (status & SS_3VCARD) 412 skt->socket.Vcc = skt->socket.Vpp = 33; 413 else if (!(status & SS_XVCARD)) 414 skt->socket.Vcc = skt->socket.Vpp = 50; 415 else { 416 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n"); 417 return -EIO; 418 } 419 420 if (skt->power_hook) 421 skt->power_hook(skt, HOOK_POWER_PRE); 422 423 skt->socket.flags = 0; 424 skt->ops->set_socket(skt, &skt->socket); 425 426 /* 427 * Wait "vcc_settle" for the supply to stabilise. 428 */ 429 msleep(vcc_settle * 10); 430 431 skt->ops->get_status(skt, &status); 432 if (!(status & SS_POWERON)) { 433 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n"); 434 return -EIO; 435 } 436 437 status = socket_reset(skt); 438 439 if (skt->power_hook) 440 skt->power_hook(skt, HOOK_POWER_POST); 441 442 return status; 443 } 444 445 /* 446 * Handle card insertion. Setup the socket, reset the card, 447 * and then tell the rest of PCMCIA that a card is present. 448 */ 449 static int socket_insert(struct pcmcia_socket *skt) 450 { 451 int ret; 452 453 dev_dbg(&skt->dev, "insert\n"); 454 455 mutex_lock(&skt->ops_mutex); 456 if (skt->state & SOCKET_INUSE) { 457 mutex_unlock(&skt->ops_mutex); 458 return -EINVAL; 459 } 460 skt->state |= SOCKET_INUSE; 461 462 ret = socket_setup(skt, setup_delay); 463 if (ret == 0) { 464 skt->state |= SOCKET_PRESENT; 465 466 dev_printk(KERN_NOTICE, &skt->dev, 467 "pccard: %s card inserted into slot %d\n", 468 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 469 skt->sock); 470 471 #ifdef CONFIG_CARDBUS 472 if (skt->state & SOCKET_CARDBUS) { 473 cb_alloc(skt); 474 skt->state |= SOCKET_CARDBUS_CONFIG; 475 } 476 #endif 477 dev_dbg(&skt->dev, "insert done\n"); 478 mutex_unlock(&skt->ops_mutex); 479 480 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 481 } else { 482 mutex_unlock(&skt->ops_mutex); 483 socket_shutdown(skt); 484 } 485 486 return ret; 487 } 488 489 static int socket_suspend(struct pcmcia_socket *skt) 490 { 491 if (skt->state & SOCKET_SUSPEND) 492 return -EBUSY; 493 494 mutex_lock(&skt->ops_mutex); 495 skt->suspended_state = skt->state; 496 497 send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); 498 skt->socket = dead_socket; 499 skt->ops->set_socket(skt, &skt->socket); 500 if (skt->ops->suspend) 501 skt->ops->suspend(skt); 502 skt->state |= SOCKET_SUSPEND; 503 mutex_unlock(&skt->ops_mutex); 504 return 0; 505 } 506 507 static int socket_early_resume(struct pcmcia_socket *skt) 508 { 509 mutex_lock(&skt->ops_mutex); 510 skt->socket = dead_socket; 511 skt->ops->init(skt); 512 skt->ops->set_socket(skt, &skt->socket); 513 if (skt->state & SOCKET_PRESENT) 514 skt->resume_status = socket_setup(skt, resume_delay); 515 mutex_unlock(&skt->ops_mutex); 516 return 0; 517 } 518 519 static int socket_late_resume(struct pcmcia_socket *skt) 520 { 521 int ret; 522 523 mutex_lock(&skt->ops_mutex); 524 skt->state &= ~SOCKET_SUSPEND; 525 mutex_unlock(&skt->ops_mutex); 526 527 if (!(skt->state & SOCKET_PRESENT)) { 528 ret = socket_insert(skt); 529 if (ret == -ENODEV) 530 ret = 0; 531 return ret; 532 } 533 534 if (skt->resume_status) { 535 socket_shutdown(skt); 536 return 0; 537 } 538 539 if (skt->suspended_state != skt->state) { 540 dev_dbg(&skt->dev, 541 "suspend state 0x%x != resume state 0x%x\n", 542 skt->suspended_state, skt->state); 543 544 socket_shutdown(skt); 545 return socket_insert(skt); 546 } 547 548 #ifdef CONFIG_CARDBUS 549 if (skt->state & SOCKET_CARDBUS) { 550 /* We can't be sure the CardBus card is the same 551 * as the one previously inserted. Therefore, remove 552 * and re-add... */ 553 cb_free(skt); 554 cb_alloc(skt); 555 return 0; 556 } 557 #endif 558 559 send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); 560 return 0; 561 } 562 563 /* 564 * Resume a socket. If a card is present, verify its CIS against 565 * our cached copy. If they are different, the card has been 566 * replaced, and we need to tell the drivers. 567 */ 568 static int socket_resume(struct pcmcia_socket *skt) 569 { 570 if (!(skt->state & SOCKET_SUSPEND)) 571 return -EBUSY; 572 573 socket_early_resume(skt); 574 return socket_late_resume(skt); 575 } 576 577 static void socket_remove(struct pcmcia_socket *skt) 578 { 579 dev_printk(KERN_NOTICE, &skt->dev, 580 "pccard: card ejected from slot %d\n", skt->sock); 581 socket_shutdown(skt); 582 } 583 584 /* 585 * Process a socket card detect status change. 586 * 587 * If we don't have a card already present, delay the detect event for 588 * about 20ms (to be on the safe side) before reading the socket status. 589 * 590 * Some i82365-based systems send multiple SS_DETECT events during card 591 * insertion, and the "card present" status bit seems to bounce. This 592 * will probably be true with GPIO-based card detection systems after 593 * the product has aged. 594 */ 595 static void socket_detect_change(struct pcmcia_socket *skt) 596 { 597 if (!(skt->state & SOCKET_SUSPEND)) { 598 int status; 599 600 if (!(skt->state & SOCKET_PRESENT)) 601 msleep(20); 602 603 skt->ops->get_status(skt, &status); 604 if ((skt->state & SOCKET_PRESENT) && 605 !(status & SS_DETECT)) 606 socket_remove(skt); 607 if (!(skt->state & SOCKET_PRESENT) && 608 (status & SS_DETECT)) 609 socket_insert(skt); 610 } 611 } 612 613 static int pccardd(void *__skt) 614 { 615 struct pcmcia_socket *skt = __skt; 616 int ret; 617 618 skt->thread = current; 619 skt->socket = dead_socket; 620 skt->ops->init(skt); 621 skt->ops->set_socket(skt, &skt->socket); 622 623 /* register with the device core */ 624 ret = device_register(&skt->dev); 625 if (ret) { 626 dev_printk(KERN_WARNING, &skt->dev, 627 "PCMCIA: unable to register socket\n"); 628 skt->thread = NULL; 629 complete(&skt->thread_done); 630 return 0; 631 } 632 ret = pccard_sysfs_add_socket(&skt->dev); 633 if (ret) 634 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); 635 636 complete(&skt->thread_done); 637 638 /* wait for userspace to catch up */ 639 msleep(250); 640 641 set_freezable(); 642 for (;;) { 643 unsigned long flags; 644 unsigned int events; 645 unsigned int sysfs_events; 646 647 set_current_state(TASK_INTERRUPTIBLE); 648 649 spin_lock_irqsave(&skt->thread_lock, flags); 650 events = skt->thread_events; 651 skt->thread_events = 0; 652 sysfs_events = skt->sysfs_events; 653 skt->sysfs_events = 0; 654 spin_unlock_irqrestore(&skt->thread_lock, flags); 655 656 mutex_lock(&skt->skt_mutex); 657 if (events) { 658 if (events & SS_DETECT) 659 socket_detect_change(skt); 660 if (events & SS_BATDEAD) 661 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); 662 if (events & SS_BATWARN) 663 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); 664 if (events & SS_READY) 665 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); 666 } 667 668 if (sysfs_events) { 669 if (sysfs_events & PCMCIA_UEVENT_EJECT) 670 socket_remove(skt); 671 if (sysfs_events & PCMCIA_UEVENT_INSERT) 672 socket_insert(skt); 673 if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) && 674 !(skt->state & SOCKET_CARDBUS)) { 675 if (skt->callback) 676 ret = skt->callback->suspend(skt); 677 else 678 ret = 0; 679 if (!ret) { 680 socket_suspend(skt); 681 msleep(100); 682 } 683 } 684 if ((sysfs_events & PCMCIA_UEVENT_RESUME) && 685 !(skt->state & SOCKET_CARDBUS)) { 686 ret = socket_resume(skt); 687 if (!ret && skt->callback) 688 skt->callback->resume(skt); 689 } 690 if ((sysfs_events & PCMCIA_UEVENT_REQUERY) && 691 !(skt->state & SOCKET_CARDBUS)) { 692 if (!ret && skt->callback) 693 skt->callback->requery(skt); 694 } 695 } 696 mutex_unlock(&skt->skt_mutex); 697 698 if (events || sysfs_events) 699 continue; 700 701 if (kthread_should_stop()) 702 break; 703 704 schedule(); 705 try_to_freeze(); 706 } 707 /* make sure we are running before we exit */ 708 set_current_state(TASK_RUNNING); 709 710 /* shut down socket, if a device is still present */ 711 if (skt->state & SOCKET_PRESENT) { 712 mutex_lock(&skt->skt_mutex); 713 socket_remove(skt); 714 mutex_unlock(&skt->skt_mutex); 715 } 716 717 /* remove from the device core */ 718 pccard_sysfs_remove_socket(&skt->dev); 719 device_unregister(&skt->dev); 720 721 return 0; 722 } 723 724 /* 725 * Yenta (at least) probes interrupts before registering the socket and 726 * starting the handler thread. 727 */ 728 void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) 729 { 730 unsigned long flags; 731 dev_dbg(&s->dev, "parse_events: events %08x\n", events); 732 if (s->thread) { 733 spin_lock_irqsave(&s->thread_lock, flags); 734 s->thread_events |= events; 735 spin_unlock_irqrestore(&s->thread_lock, flags); 736 737 wake_up_process(s->thread); 738 } 739 } /* pcmcia_parse_events */ 740 EXPORT_SYMBOL(pcmcia_parse_events); 741 742 /** 743 * pcmcia_parse_uevents() - tell pccardd to issue manual commands 744 * @s: the PCMCIA socket we wan't to command 745 * @events: events to pass to pccardd 746 * 747 * userspace-issued insert, eject, suspend and resume commands must be 748 * handled by pccardd to avoid any sysfs-related deadlocks. Valid events 749 * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert), 750 * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend) 751 * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card). 752 */ 753 void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events) 754 { 755 unsigned long flags; 756 dev_dbg(&s->dev, "parse_uevents: events %08x\n", events); 757 if (s->thread) { 758 spin_lock_irqsave(&s->thread_lock, flags); 759 s->sysfs_events |= events; 760 spin_unlock_irqrestore(&s->thread_lock, flags); 761 762 wake_up_process(s->thread); 763 } 764 } 765 EXPORT_SYMBOL(pcmcia_parse_uevents); 766 767 768 /* register pcmcia_callback */ 769 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 770 { 771 int ret = 0; 772 773 /* s->skt_mutex also protects s->callback */ 774 mutex_lock(&s->skt_mutex); 775 776 if (c) { 777 /* registration */ 778 if (s->callback) { 779 ret = -EBUSY; 780 goto err; 781 } 782 783 s->callback = c; 784 785 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 786 send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 787 } else 788 s->callback = NULL; 789 err: 790 mutex_unlock(&s->skt_mutex); 791 792 return ret; 793 } 794 EXPORT_SYMBOL(pccard_register_pcmcia); 795 796 797 /* I'm not sure which "reset" function this is supposed to use, 798 * but for now, it uses the low-level interface's reset, not the 799 * CIS register. 800 */ 801 802 int pcmcia_reset_card(struct pcmcia_socket *skt) 803 { 804 int ret; 805 806 dev_dbg(&skt->dev, "resetting socket\n"); 807 808 mutex_lock(&skt->skt_mutex); 809 do { 810 if (!(skt->state & SOCKET_PRESENT)) { 811 dev_dbg(&skt->dev, "can't reset, not present\n"); 812 ret = -ENODEV; 813 break; 814 } 815 if (skt->state & SOCKET_SUSPEND) { 816 dev_dbg(&skt->dev, "can't reset, suspended\n"); 817 ret = -EBUSY; 818 break; 819 } 820 if (skt->state & SOCKET_CARDBUS) { 821 dev_dbg(&skt->dev, "can't reset, is cardbus\n"); 822 ret = -EPERM; 823 break; 824 } 825 826 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); 827 if (ret == 0) { 828 send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); 829 if (skt->callback) 830 skt->callback->suspend(skt); 831 mutex_lock(&skt->ops_mutex); 832 ret = socket_reset(skt); 833 mutex_unlock(&skt->ops_mutex); 834 if (ret == 0) { 835 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); 836 if (skt->callback) 837 skt->callback->resume(skt); 838 } 839 } 840 841 ret = 0; 842 } while (0); 843 mutex_unlock(&skt->skt_mutex); 844 845 return ret; 846 } /* reset_card */ 847 EXPORT_SYMBOL(pcmcia_reset_card); 848 849 850 static int pcmcia_socket_uevent(struct device *dev, 851 struct kobj_uevent_env *env) 852 { 853 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 854 855 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) 856 return -ENOMEM; 857 858 return 0; 859 } 860 861 862 static struct completion pcmcia_unload; 863 864 static void pcmcia_release_socket_class(struct class *data) 865 { 866 complete(&pcmcia_unload); 867 } 868 869 870 #ifdef CONFIG_PM 871 872 static int __pcmcia_pm_op(struct device *dev, 873 int (*callback) (struct pcmcia_socket *skt)) 874 { 875 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 876 int ret; 877 878 mutex_lock(&s->skt_mutex); 879 ret = callback(s); 880 mutex_unlock(&s->skt_mutex); 881 882 return ret; 883 } 884 885 static int pcmcia_socket_dev_suspend_noirq(struct device *dev) 886 { 887 return __pcmcia_pm_op(dev, socket_suspend); 888 } 889 890 static int pcmcia_socket_dev_resume_noirq(struct device *dev) 891 { 892 return __pcmcia_pm_op(dev, socket_early_resume); 893 } 894 895 static int pcmcia_socket_dev_resume(struct device *dev) 896 { 897 return __pcmcia_pm_op(dev, socket_late_resume); 898 } 899 900 static const struct dev_pm_ops pcmcia_socket_pm_ops = { 901 /* dev_resume may be called with IRQs enabled */ 902 SET_SYSTEM_SLEEP_PM_OPS(NULL, 903 pcmcia_socket_dev_resume) 904 905 /* late suspend must be called with IRQs disabled */ 906 .suspend_noirq = pcmcia_socket_dev_suspend_noirq, 907 .freeze_noirq = pcmcia_socket_dev_suspend_noirq, 908 .poweroff_noirq = pcmcia_socket_dev_suspend_noirq, 909 910 /* early resume must be called with IRQs disabled */ 911 .resume_noirq = pcmcia_socket_dev_resume_noirq, 912 .thaw_noirq = pcmcia_socket_dev_resume_noirq, 913 .restore_noirq = pcmcia_socket_dev_resume_noirq, 914 }; 915 916 #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops) 917 918 #else /* CONFIG_PM */ 919 920 #define PCMCIA_SOCKET_CLASS_PM_OPS NULL 921 922 #endif /* CONFIG_PM */ 923 924 struct class pcmcia_socket_class = { 925 .name = "pcmcia_socket", 926 .dev_uevent = pcmcia_socket_uevent, 927 .dev_release = pcmcia_release_socket, 928 .class_release = pcmcia_release_socket_class, 929 .pm = PCMCIA_SOCKET_CLASS_PM_OPS, 930 }; 931 EXPORT_SYMBOL(pcmcia_socket_class); 932 933 934 static int __init init_pcmcia_cs(void) 935 { 936 init_completion(&pcmcia_unload); 937 return class_register(&pcmcia_socket_class); 938 } 939 940 static void __exit exit_pcmcia_cs(void) 941 { 942 class_unregister(&pcmcia_socket_class); 943 wait_for_completion(&pcmcia_unload); 944 } 945 946 subsys_initcall(init_pcmcia_cs); 947 module_exit(exit_pcmcia_cs); 948 949