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 /* 80 * Low-level PCMCIA socket drivers need to register with the PCCard 81 * core using pcmcia_register_socket. 82 * 83 * socket drivers are expected to use the following callbacks in their 84 * .drv struct: 85 * - pcmcia_socket_dev_suspend 86 * - pcmcia_socket_dev_resume 87 * These functions check for the appropriate struct pcmcia_soket arrays, 88 * and pass them to the low-level functions pcmcia_{suspend,resume}_socket 89 */ 90 static int socket_early_resume(struct pcmcia_socket *skt); 91 static int socket_late_resume(struct pcmcia_socket *skt); 92 static int socket_resume(struct pcmcia_socket *skt); 93 static int socket_suspend(struct pcmcia_socket *skt); 94 95 static void pcmcia_socket_dev_run(struct device *dev, 96 int (*cb)(struct pcmcia_socket *)) 97 { 98 struct pcmcia_socket *socket; 99 100 down_read(&pcmcia_socket_list_rwsem); 101 list_for_each_entry(socket, &pcmcia_socket_list, socket_list) { 102 if (socket->dev.parent != dev) 103 continue; 104 mutex_lock(&socket->skt_mutex); 105 cb(socket); 106 mutex_unlock(&socket->skt_mutex); 107 } 108 up_read(&pcmcia_socket_list_rwsem); 109 } 110 111 int pcmcia_socket_dev_suspend(struct device *dev) 112 { 113 pcmcia_socket_dev_run(dev, socket_suspend); 114 return 0; 115 } 116 EXPORT_SYMBOL(pcmcia_socket_dev_suspend); 117 118 void pcmcia_socket_dev_early_resume(struct device *dev) 119 { 120 pcmcia_socket_dev_run(dev, socket_early_resume); 121 } 122 EXPORT_SYMBOL(pcmcia_socket_dev_early_resume); 123 124 void pcmcia_socket_dev_late_resume(struct device *dev) 125 { 126 pcmcia_socket_dev_run(dev, socket_late_resume); 127 } 128 EXPORT_SYMBOL(pcmcia_socket_dev_late_resume); 129 130 int pcmcia_socket_dev_resume(struct device *dev) 131 { 132 pcmcia_socket_dev_run(dev, socket_resume); 133 return 0; 134 } 135 EXPORT_SYMBOL(pcmcia_socket_dev_resume); 136 137 138 struct pcmcia_socket *pcmcia_get_socket(struct pcmcia_socket *skt) 139 { 140 struct device *dev = get_device(&skt->dev); 141 if (!dev) 142 return NULL; 143 return dev_get_drvdata(dev); 144 } 145 EXPORT_SYMBOL(pcmcia_get_socket); 146 147 148 void pcmcia_put_socket(struct pcmcia_socket *skt) 149 { 150 put_device(&skt->dev); 151 } 152 EXPORT_SYMBOL(pcmcia_put_socket); 153 154 155 static void pcmcia_release_socket(struct device *dev) 156 { 157 struct pcmcia_socket *socket = dev_get_drvdata(dev); 158 159 complete(&socket->socket_released); 160 } 161 162 static int pccardd(void *__skt); 163 164 /** 165 * pcmcia_register_socket - add a new pcmcia socket device 166 * @socket: the &socket to register 167 */ 168 int pcmcia_register_socket(struct pcmcia_socket *socket) 169 { 170 struct task_struct *tsk; 171 int ret; 172 173 if (!socket || !socket->ops || !socket->dev.parent || !socket->resource_ops) 174 return -EINVAL; 175 176 dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops); 177 178 /* try to obtain a socket number [yes, it gets ugly if we 179 * register more than 2^sizeof(unsigned int) pcmcia 180 * sockets... but the socket number is deprecated 181 * anyways, so I don't care] */ 182 down_write(&pcmcia_socket_list_rwsem); 183 if (list_empty(&pcmcia_socket_list)) 184 socket->sock = 0; 185 else { 186 unsigned int found, i = 1; 187 struct pcmcia_socket *tmp; 188 do { 189 found = 1; 190 list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { 191 if (tmp->sock == i) 192 found = 0; 193 } 194 i++; 195 } while (!found); 196 socket->sock = i - 1; 197 } 198 list_add_tail(&socket->socket_list, &pcmcia_socket_list); 199 up_write(&pcmcia_socket_list_rwsem); 200 201 #ifndef CONFIG_CARDBUS 202 /* 203 * If we do not support Cardbus, ensure that 204 * the Cardbus socket capability is disabled. 205 */ 206 socket->features &= ~SS_CAP_CARDBUS; 207 #endif 208 209 /* set proper values in socket->dev */ 210 dev_set_drvdata(&socket->dev, socket); 211 socket->dev.class = &pcmcia_socket_class; 212 dev_set_name(&socket->dev, "pcmcia_socket%u", socket->sock); 213 214 /* base address = 0, map = 0 */ 215 socket->cis_mem.flags = 0; 216 socket->cis_mem.speed = cis_speed; 217 218 INIT_LIST_HEAD(&socket->cis_cache); 219 220 init_completion(&socket->socket_released); 221 init_completion(&socket->thread_done); 222 mutex_init(&socket->skt_mutex); 223 mutex_init(&socket->ops_mutex); 224 spin_lock_init(&socket->thread_lock); 225 226 if (socket->resource_ops->init) { 227 ret = socket->resource_ops->init(socket); 228 if (ret) 229 goto err; 230 } 231 232 tsk = kthread_run(pccardd, socket, "pccardd"); 233 if (IS_ERR(tsk)) { 234 ret = PTR_ERR(tsk); 235 goto err; 236 } 237 238 wait_for_completion(&socket->thread_done); 239 if (!socket->thread) { 240 dev_printk(KERN_WARNING, &socket->dev, 241 "PCMCIA: warning: socket thread did not start\n"); 242 return -EIO; 243 } 244 245 pcmcia_parse_events(socket, SS_DETECT); 246 247 /* 248 * Let's try to get the PCMCIA module for 16-bit PCMCIA support. 249 * If it fails, it doesn't matter -- we still have 32-bit CardBus 250 * support to offer, so this is not a failure mode. 251 */ 252 request_module_nowait("pcmcia"); 253 254 return 0; 255 256 err: 257 down_write(&pcmcia_socket_list_rwsem); 258 list_del(&socket->socket_list); 259 up_write(&pcmcia_socket_list_rwsem); 260 return ret; 261 } /* pcmcia_register_socket */ 262 EXPORT_SYMBOL(pcmcia_register_socket); 263 264 265 /** 266 * pcmcia_unregister_socket - remove a pcmcia socket device 267 * @socket: the &socket to unregister 268 */ 269 void pcmcia_unregister_socket(struct pcmcia_socket *socket) 270 { 271 if (!socket) 272 return; 273 274 dev_dbg(&socket->dev, "pcmcia_unregister_socket(0x%p)\n", socket->ops); 275 276 if (socket->thread) 277 kthread_stop(socket->thread); 278 279 /* remove from our own list */ 280 down_write(&pcmcia_socket_list_rwsem); 281 list_del(&socket->socket_list); 282 up_write(&pcmcia_socket_list_rwsem); 283 284 /* wait for sysfs to drop all references */ 285 if (socket->resource_ops->exit) 286 socket->resource_ops->exit(socket); 287 wait_for_completion(&socket->socket_released); 288 } /* pcmcia_unregister_socket */ 289 EXPORT_SYMBOL(pcmcia_unregister_socket); 290 291 292 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr) 293 { 294 struct pcmcia_socket *s; 295 296 down_read(&pcmcia_socket_list_rwsem); 297 list_for_each_entry(s, &pcmcia_socket_list, socket_list) 298 if (s->sock == nr) { 299 up_read(&pcmcia_socket_list_rwsem); 300 return s; 301 } 302 up_read(&pcmcia_socket_list_rwsem); 303 304 return NULL; 305 306 } 307 EXPORT_SYMBOL(pcmcia_get_socket_by_nr); 308 309 /* 310 * The central event handler. Send_event() sends an event to the 311 * 16-bit subsystem, which then calls the relevant device drivers. 312 * Parse_events() interprets the event bits from 313 * a card status change report. Do_shutdown() handles the high 314 * priority stuff associated with a card removal. 315 */ 316 317 /* NOTE: send_event needs to be called with skt->sem held. */ 318 319 static int send_event(struct pcmcia_socket *s, event_t event, int priority) 320 { 321 int ret; 322 323 if ((s->state & SOCKET_CARDBUS) && (event != CS_EVENT_CARD_REMOVAL)) 324 return 0; 325 326 dev_dbg(&s->dev, "send_event(event %d, pri %d, callback 0x%p)\n", 327 event, priority, s->callback); 328 329 if (!s->callback) 330 return 0; 331 if (!try_module_get(s->callback->owner)) 332 return 0; 333 334 ret = s->callback->event(s, event, priority); 335 336 module_put(s->callback->owner); 337 338 return ret; 339 } 340 341 static int socket_reset(struct pcmcia_socket *skt) 342 { 343 int status, i; 344 345 dev_dbg(&skt->dev, "reset\n"); 346 347 skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; 348 skt->ops->set_socket(skt, &skt->socket); 349 udelay((long)reset_time); 350 351 skt->socket.flags &= ~SS_RESET; 352 skt->ops->set_socket(skt, &skt->socket); 353 354 msleep(unreset_delay * 10); 355 for (i = 0; i < unreset_limit; i++) { 356 skt->ops->get_status(skt, &status); 357 358 if (!(status & SS_DETECT)) 359 return -ENODEV; 360 361 if (status & SS_READY) 362 return 0; 363 364 msleep(unreset_check * 10); 365 } 366 367 dev_printk(KERN_ERR, &skt->dev, "time out after reset.\n"); 368 return -ETIMEDOUT; 369 } 370 371 /* 372 * socket_setup() and socket_shutdown() are called by the main event handler 373 * when card insertion and removal events are received. 374 * socket_setup() turns on socket power and resets the socket, in two stages. 375 * socket_shutdown() unconfigures a socket and turns off socket power. 376 */ 377 static void socket_shutdown(struct pcmcia_socket *s) 378 { 379 int status; 380 381 dev_dbg(&s->dev, "shutdown\n"); 382 383 send_event(s, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH); 384 385 mutex_lock(&s->ops_mutex); 386 s->state &= SOCKET_INUSE | SOCKET_PRESENT; 387 msleep(shutdown_delay * 10); 388 s->state &= SOCKET_INUSE; 389 390 /* Blank out the socket state */ 391 s->socket = dead_socket; 392 s->ops->init(s); 393 s->ops->set_socket(s, &s->socket); 394 s->irq.AssignedIRQ = s->irq.Config = 0; 395 s->lock_count = 0; 396 kfree(s->fake_cis); 397 s->fake_cis = NULL; 398 #ifdef CONFIG_CARDBUS 399 cb_free(s); 400 #endif 401 s->functions = 0; 402 403 /* give socket some time to power down */ 404 msleep(100); 405 406 s->ops->get_status(s, &status); 407 if (status & SS_POWERON) { 408 dev_printk(KERN_ERR, &s->dev, 409 "*** DANGER *** unable to remove socket power\n"); 410 } 411 412 s->state &= ~SOCKET_INUSE; 413 mutex_unlock(&s->ops_mutex); 414 } 415 416 static int socket_setup(struct pcmcia_socket *skt, int initial_delay) 417 { 418 int status, i; 419 420 dev_dbg(&skt->dev, "setup\n"); 421 422 skt->ops->get_status(skt, &status); 423 if (!(status & SS_DETECT)) 424 return -ENODEV; 425 426 msleep(initial_delay * 10); 427 428 for (i = 0; i < 100; i++) { 429 skt->ops->get_status(skt, &status); 430 if (!(status & SS_DETECT)) 431 return -ENODEV; 432 433 if (!(status & SS_PENDING)) 434 break; 435 436 msleep(100); 437 } 438 439 if (status & SS_PENDING) { 440 dev_printk(KERN_ERR, &skt->dev, 441 "voltage interrogation timed out.\n"); 442 return -ETIMEDOUT; 443 } 444 445 if (status & SS_CARDBUS) { 446 if (!(skt->features & SS_CAP_CARDBUS)) { 447 dev_printk(KERN_ERR, &skt->dev, 448 "cardbus cards are not supported.\n"); 449 return -EINVAL; 450 } 451 skt->state |= SOCKET_CARDBUS; 452 } else 453 skt->state &= ~SOCKET_CARDBUS; 454 455 /* 456 * Decode the card voltage requirements, and apply power to the card. 457 */ 458 if (status & SS_3VCARD) 459 skt->socket.Vcc = skt->socket.Vpp = 33; 460 else if (!(status & SS_XVCARD)) 461 skt->socket.Vcc = skt->socket.Vpp = 50; 462 else { 463 dev_printk(KERN_ERR, &skt->dev, "unsupported voltage key.\n"); 464 return -EIO; 465 } 466 467 if (skt->power_hook) 468 skt->power_hook(skt, HOOK_POWER_PRE); 469 470 skt->socket.flags = 0; 471 skt->ops->set_socket(skt, &skt->socket); 472 473 /* 474 * Wait "vcc_settle" for the supply to stabilise. 475 */ 476 msleep(vcc_settle * 10); 477 478 skt->ops->get_status(skt, &status); 479 if (!(status & SS_POWERON)) { 480 dev_printk(KERN_ERR, &skt->dev, "unable to apply power.\n"); 481 return -EIO; 482 } 483 484 status = socket_reset(skt); 485 486 if (skt->power_hook) 487 skt->power_hook(skt, HOOK_POWER_POST); 488 489 return status; 490 } 491 492 /* 493 * Handle card insertion. Setup the socket, reset the card, 494 * and then tell the rest of PCMCIA that a card is present. 495 */ 496 static int socket_insert(struct pcmcia_socket *skt) 497 { 498 int ret; 499 500 dev_dbg(&skt->dev, "insert\n"); 501 502 mutex_lock(&skt->ops_mutex); 503 WARN_ON(skt->state & SOCKET_INUSE); 504 skt->state |= SOCKET_INUSE; 505 506 ret = socket_setup(skt, setup_delay); 507 if (ret == 0) { 508 skt->state |= SOCKET_PRESENT; 509 510 dev_printk(KERN_NOTICE, &skt->dev, 511 "pccard: %s card inserted into slot %d\n", 512 (skt->state & SOCKET_CARDBUS) ? "CardBus" : "PCMCIA", 513 skt->sock); 514 515 #ifdef CONFIG_CARDBUS 516 if (skt->state & SOCKET_CARDBUS) { 517 cb_alloc(skt); 518 skt->state |= SOCKET_CARDBUS_CONFIG; 519 } 520 #endif 521 dev_dbg(&skt->dev, "insert done\n"); 522 mutex_unlock(&skt->ops_mutex); 523 524 send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 525 } else { 526 mutex_unlock(&skt->ops_mutex); 527 socket_shutdown(skt); 528 } 529 530 return ret; 531 } 532 533 static int socket_suspend(struct pcmcia_socket *skt) 534 { 535 if (skt->state & SOCKET_SUSPEND) 536 return -EBUSY; 537 538 mutex_lock(&skt->ops_mutex); 539 skt->suspended_state = skt->state; 540 541 send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); 542 skt->socket = dead_socket; 543 skt->ops->set_socket(skt, &skt->socket); 544 if (skt->ops->suspend) 545 skt->ops->suspend(skt); 546 skt->state |= SOCKET_SUSPEND; 547 mutex_unlock(&skt->ops_mutex); 548 return 0; 549 } 550 551 static int socket_early_resume(struct pcmcia_socket *skt) 552 { 553 mutex_lock(&skt->ops_mutex); 554 skt->socket = dead_socket; 555 skt->ops->init(skt); 556 skt->ops->set_socket(skt, &skt->socket); 557 if (skt->state & SOCKET_PRESENT) 558 skt->resume_status = socket_setup(skt, resume_delay); 559 mutex_unlock(&skt->ops_mutex); 560 return 0; 561 } 562 563 static int socket_late_resume(struct pcmcia_socket *skt) 564 { 565 mutex_lock(&skt->ops_mutex); 566 skt->state &= ~SOCKET_SUSPEND; 567 mutex_unlock(&skt->ops_mutex); 568 569 if (!(skt->state & SOCKET_PRESENT)) 570 return socket_insert(skt); 571 572 if (skt->resume_status) { 573 socket_shutdown(skt); 574 return 0; 575 } 576 577 if (skt->suspended_state != skt->state) { 578 dev_dbg(&skt->dev, 579 "suspend state 0x%x != resume state 0x%x\n", 580 skt->suspended_state, skt->state); 581 582 socket_shutdown(skt); 583 return socket_insert(skt); 584 } 585 586 #ifdef CONFIG_CARDBUS 587 if (skt->state & SOCKET_CARDBUS) { 588 /* We can't be sure the CardBus card is the same 589 * as the one previously inserted. Therefore, remove 590 * and re-add... */ 591 cb_free(skt); 592 cb_alloc(skt); 593 return 0; 594 } 595 #endif 596 597 send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); 598 return 0; 599 } 600 601 /* 602 * Resume a socket. If a card is present, verify its CIS against 603 * our cached copy. If they are different, the card has been 604 * replaced, and we need to tell the drivers. 605 */ 606 static int socket_resume(struct pcmcia_socket *skt) 607 { 608 if (!(skt->state & SOCKET_SUSPEND)) 609 return -EBUSY; 610 611 socket_early_resume(skt); 612 return socket_late_resume(skt); 613 } 614 615 static void socket_remove(struct pcmcia_socket *skt) 616 { 617 dev_printk(KERN_NOTICE, &skt->dev, 618 "pccard: card ejected from slot %d\n", skt->sock); 619 socket_shutdown(skt); 620 } 621 622 /* 623 * Process a socket card detect status change. 624 * 625 * If we don't have a card already present, delay the detect event for 626 * about 20ms (to be on the safe side) before reading the socket status. 627 * 628 * Some i82365-based systems send multiple SS_DETECT events during card 629 * insertion, and the "card present" status bit seems to bounce. This 630 * will probably be true with GPIO-based card detection systems after 631 * the product has aged. 632 */ 633 static void socket_detect_change(struct pcmcia_socket *skt) 634 { 635 if (!(skt->state & SOCKET_SUSPEND)) { 636 int status; 637 638 if (!(skt->state & SOCKET_PRESENT)) 639 msleep(20); 640 641 skt->ops->get_status(skt, &status); 642 if ((skt->state & SOCKET_PRESENT) && 643 !(status & SS_DETECT)) 644 socket_remove(skt); 645 if (!(skt->state & SOCKET_PRESENT) && 646 (status & SS_DETECT)) 647 socket_insert(skt); 648 } 649 } 650 651 static int pccardd(void *__skt) 652 { 653 struct pcmcia_socket *skt = __skt; 654 int ret; 655 656 skt->thread = current; 657 skt->socket = dead_socket; 658 skt->ops->init(skt); 659 skt->ops->set_socket(skt, &skt->socket); 660 661 /* register with the device core */ 662 ret = device_register(&skt->dev); 663 if (ret) { 664 dev_printk(KERN_WARNING, &skt->dev, 665 "PCMCIA: unable to register socket\n"); 666 skt->thread = NULL; 667 complete(&skt->thread_done); 668 return 0; 669 } 670 ret = pccard_sysfs_add_socket(&skt->dev); 671 if (ret) 672 dev_warn(&skt->dev, "err %d adding socket attributes\n", ret); 673 674 complete(&skt->thread_done); 675 676 set_freezable(); 677 for (;;) { 678 unsigned long flags; 679 unsigned int events; 680 681 set_current_state(TASK_INTERRUPTIBLE); 682 683 spin_lock_irqsave(&skt->thread_lock, flags); 684 events = skt->thread_events; 685 skt->thread_events = 0; 686 spin_unlock_irqrestore(&skt->thread_lock, flags); 687 688 if (events) { 689 mutex_lock(&skt->skt_mutex); 690 if (events & SS_DETECT) 691 socket_detect_change(skt); 692 if (events & SS_BATDEAD) 693 send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); 694 if (events & SS_BATWARN) 695 send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); 696 if (events & SS_READY) 697 send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); 698 mutex_unlock(&skt->skt_mutex); 699 continue; 700 } 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 /* register pcmcia_callback */ 745 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) 746 { 747 int ret = 0; 748 749 /* s->skt_mutex also protects s->callback */ 750 mutex_lock(&s->skt_mutex); 751 752 if (c) { 753 /* registration */ 754 if (s->callback) { 755 ret = -EBUSY; 756 goto err; 757 } 758 759 s->callback = c; 760 761 if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) 762 send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); 763 } else 764 s->callback = NULL; 765 err: 766 mutex_unlock(&s->skt_mutex); 767 768 return ret; 769 } 770 EXPORT_SYMBOL(pccard_register_pcmcia); 771 772 773 /* I'm not sure which "reset" function this is supposed to use, 774 * but for now, it uses the low-level interface's reset, not the 775 * CIS register. 776 */ 777 778 int pcmcia_reset_card(struct pcmcia_socket *skt) 779 { 780 int ret; 781 782 dev_dbg(&skt->dev, "resetting socket\n"); 783 784 mutex_lock(&skt->skt_mutex); 785 do { 786 if (!(skt->state & SOCKET_PRESENT)) { 787 dev_dbg(&skt->dev, "can't reset, not present\n"); 788 ret = -ENODEV; 789 break; 790 } 791 if (skt->state & SOCKET_SUSPEND) { 792 dev_dbg(&skt->dev, "can't reset, suspended\n"); 793 ret = -EBUSY; 794 break; 795 } 796 if (skt->state & SOCKET_CARDBUS) { 797 dev_dbg(&skt->dev, "can't reset, is cardbus\n"); 798 ret = -EPERM; 799 break; 800 } 801 802 ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); 803 if (ret == 0) { 804 send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); 805 if (skt->callback) 806 skt->callback->suspend(skt); 807 mutex_lock(&skt->ops_mutex); 808 ret = socket_reset(skt); 809 mutex_unlock(&skt->ops_mutex); 810 if (ret == 0) { 811 send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); 812 if (skt->callback) 813 skt->callback->resume(skt); 814 } 815 } 816 817 ret = 0; 818 } while (0); 819 mutex_unlock(&skt->skt_mutex); 820 821 return ret; 822 } /* reset_card */ 823 EXPORT_SYMBOL(pcmcia_reset_card); 824 825 826 /* These shut down or wake up a socket. They are sort of user 827 * initiated versions of the APM suspend and resume actions. 828 */ 829 int pcmcia_suspend_card(struct pcmcia_socket *skt) 830 { 831 int ret; 832 833 dev_dbg(&skt->dev, "suspending socket\n"); 834 835 mutex_lock(&skt->skt_mutex); 836 do { 837 if (!(skt->state & SOCKET_PRESENT)) { 838 ret = -ENODEV; 839 break; 840 } 841 if (skt->state & SOCKET_CARDBUS) { 842 ret = -EPERM; 843 break; 844 } 845 if (skt->callback) { 846 ret = skt->callback->suspend(skt); 847 if (ret) 848 break; 849 } 850 ret = socket_suspend(skt); 851 } while (0); 852 mutex_unlock(&skt->skt_mutex); 853 854 return ret; 855 } /* suspend_card */ 856 EXPORT_SYMBOL(pcmcia_suspend_card); 857 858 859 int pcmcia_resume_card(struct pcmcia_socket *skt) 860 { 861 int ret; 862 863 dev_dbg(&skt->dev, "waking up socket\n"); 864 865 mutex_lock(&skt->skt_mutex); 866 do { 867 if (!(skt->state & SOCKET_PRESENT)) { 868 ret = -ENODEV; 869 break; 870 } 871 if (skt->state & SOCKET_CARDBUS) { 872 ret = -EPERM; 873 break; 874 } 875 ret = socket_resume(skt); 876 if (!ret && skt->callback) 877 skt->callback->resume(skt); 878 } while (0); 879 mutex_unlock(&skt->skt_mutex); 880 881 return ret; 882 } /* resume_card */ 883 EXPORT_SYMBOL(pcmcia_resume_card); 884 885 886 /* These handle user requests to eject or insert a card. */ 887 int pcmcia_eject_card(struct pcmcia_socket *skt) 888 { 889 int ret; 890 891 dev_dbg(&skt->dev, "user eject request\n"); 892 893 mutex_lock(&skt->skt_mutex); 894 do { 895 if (!(skt->state & SOCKET_PRESENT)) { 896 ret = -ENODEV; 897 break; 898 } 899 900 ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); 901 if (ret != 0) { 902 ret = -EINVAL; 903 break; 904 } 905 906 socket_remove(skt); 907 ret = 0; 908 } while (0); 909 mutex_unlock(&skt->skt_mutex); 910 911 return ret; 912 } /* eject_card */ 913 EXPORT_SYMBOL(pcmcia_eject_card); 914 915 916 int pcmcia_insert_card(struct pcmcia_socket *skt) 917 { 918 int ret; 919 920 dev_dbg(&skt->dev, "user insert request\n"); 921 922 mutex_lock(&skt->skt_mutex); 923 do { 924 if (skt->state & SOCKET_PRESENT) { 925 ret = -EBUSY; 926 break; 927 } 928 if (socket_insert(skt) == -ENODEV) { 929 ret = -ENODEV; 930 break; 931 } 932 ret = 0; 933 } while (0); 934 mutex_unlock(&skt->skt_mutex); 935 936 return ret; 937 } /* insert_card */ 938 EXPORT_SYMBOL(pcmcia_insert_card); 939 940 941 static int pcmcia_socket_uevent(struct device *dev, 942 struct kobj_uevent_env *env) 943 { 944 struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); 945 946 if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) 947 return -ENOMEM; 948 949 return 0; 950 } 951 952 953 static struct completion pcmcia_unload; 954 955 static void pcmcia_release_socket_class(struct class *data) 956 { 957 complete(&pcmcia_unload); 958 } 959 960 961 struct class pcmcia_socket_class = { 962 .name = "pcmcia_socket", 963 .dev_uevent = pcmcia_socket_uevent, 964 .dev_release = pcmcia_release_socket, 965 .class_release = pcmcia_release_socket_class, 966 }; 967 EXPORT_SYMBOL(pcmcia_socket_class); 968 969 970 static int __init init_pcmcia_cs(void) 971 { 972 init_completion(&pcmcia_unload); 973 return class_register(&pcmcia_socket_class); 974 } 975 976 static void __exit exit_pcmcia_cs(void) 977 { 978 class_unregister(&pcmcia_socket_class); 979 wait_for_completion(&pcmcia_unload); 980 } 981 982 subsys_initcall(init_pcmcia_cs); 983 module_exit(exit_pcmcia_cs); 984 985