Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/config.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/major.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/timer.h> |
| 27 | #include <linux/ioport.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/pm.h> |
| 30 | #include <linux/pci.h> |
| 31 | #include <linux/device.h> |
| 32 | #include <asm/system.h> |
| 33 | #include <asm/irq.h> |
| 34 | |
| 35 | #define IN_CARD_SERVICES |
| 36 | #include <pcmcia/version.h> |
| 37 | #include <pcmcia/cs_types.h> |
| 38 | #include <pcmcia/ss.h> |
| 39 | #include <pcmcia/cs.h> |
| 40 | #include <pcmcia/bulkmem.h> |
| 41 | #include <pcmcia/cistpl.h> |
| 42 | #include <pcmcia/cisreg.h> |
| 43 | #include <pcmcia/ds.h> |
| 44 | #include "cs_internal.h" |
| 45 | |
| 46 | #ifdef CONFIG_PCI |
| 47 | #define PCI_OPT " [pci]" |
| 48 | #else |
| 49 | #define PCI_OPT "" |
| 50 | #endif |
| 51 | #ifdef CONFIG_CARDBUS |
| 52 | #define CB_OPT " [cardbus]" |
| 53 | #else |
| 54 | #define CB_OPT "" |
| 55 | #endif |
| 56 | #ifdef CONFIG_PM |
| 57 | #define PM_OPT " [pm]" |
| 58 | #else |
| 59 | #define PM_OPT "" |
| 60 | #endif |
| 61 | #if !defined(CONFIG_CARDBUS) && !defined(CONFIG_PCI) && !defined(CONFIG_PM) |
| 62 | #define OPTIONS " none" |
| 63 | #else |
| 64 | #define OPTIONS PCI_OPT CB_OPT PM_OPT |
| 65 | #endif |
| 66 | |
| 67 | static const char *release = "Linux Kernel Card Services"; |
| 68 | static const char *options = "options: " OPTIONS; |
| 69 | |
| 70 | /*====================================================================*/ |
| 71 | |
| 72 | /* Module parameters */ |
| 73 | |
| 74 | MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>"); |
| 75 | MODULE_DESCRIPTION("Linux Kernel Card Services\noptions:" OPTIONS); |
| 76 | MODULE_LICENSE("GPL"); |
| 77 | |
| 78 | #define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0444) |
| 79 | |
| 80 | INT_MODULE_PARM(setup_delay, 10); /* centiseconds */ |
| 81 | INT_MODULE_PARM(resume_delay, 20); /* centiseconds */ |
| 82 | INT_MODULE_PARM(shutdown_delay, 3); /* centiseconds */ |
| 83 | INT_MODULE_PARM(vcc_settle, 40); /* centiseconds */ |
| 84 | INT_MODULE_PARM(reset_time, 10); /* usecs */ |
| 85 | INT_MODULE_PARM(unreset_delay, 10); /* centiseconds */ |
| 86 | INT_MODULE_PARM(unreset_check, 10); /* centiseconds */ |
| 87 | INT_MODULE_PARM(unreset_limit, 30); /* unreset_check's */ |
| 88 | |
| 89 | /* Access speed for attribute memory windows */ |
| 90 | INT_MODULE_PARM(cis_speed, 300); /* ns */ |
| 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #ifdef DEBUG |
| 93 | static int pc_debug; |
| 94 | |
| 95 | module_param(pc_debug, int, 0644); |
| 96 | |
| 97 | int cs_debug_level(int level) |
| 98 | { |
| 99 | return pc_debug > level; |
| 100 | } |
| 101 | #endif |
| 102 | |
| 103 | /*====================================================================*/ |
| 104 | |
| 105 | socket_state_t dead_socket = { |
| 106 | .csc_mask = SS_DETECT, |
| 107 | }; |
| 108 | |
| 109 | |
| 110 | /* List of all sockets, protected by a rwsem */ |
| 111 | LIST_HEAD(pcmcia_socket_list); |
| 112 | DECLARE_RWSEM(pcmcia_socket_list_rwsem); |
| 113 | EXPORT_SYMBOL(pcmcia_socket_list); |
| 114 | EXPORT_SYMBOL(pcmcia_socket_list_rwsem); |
| 115 | |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | /*==================================================================== |
| 118 | |
| 119 | Low-level PC Card interface drivers need to register with Card |
| 120 | Services using these calls. |
| 121 | |
| 122 | ======================================================================*/ |
| 123 | |
| 124 | /** |
| 125 | * socket drivers are expected to use the following callbacks in their |
| 126 | * .drv struct: |
| 127 | * - pcmcia_socket_dev_suspend |
| 128 | * - pcmcia_socket_dev_resume |
| 129 | * These functions check for the appropriate struct pcmcia_soket arrays, |
| 130 | * and pass them to the low-level functions pcmcia_{suspend,resume}_socket |
| 131 | */ |
| 132 | static int socket_resume(struct pcmcia_socket *skt); |
| 133 | static int socket_suspend(struct pcmcia_socket *skt); |
| 134 | |
| 135 | int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state) |
| 136 | { |
| 137 | struct pcmcia_socket *socket; |
| 138 | |
| 139 | down_read(&pcmcia_socket_list_rwsem); |
| 140 | list_for_each_entry(socket, &pcmcia_socket_list, socket_list) { |
| 141 | if (socket->dev.dev != dev) |
| 142 | continue; |
| 143 | down(&socket->skt_sem); |
| 144 | socket_suspend(socket); |
| 145 | up(&socket->skt_sem); |
| 146 | } |
| 147 | up_read(&pcmcia_socket_list_rwsem); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | EXPORT_SYMBOL(pcmcia_socket_dev_suspend); |
| 152 | |
| 153 | int pcmcia_socket_dev_resume(struct device *dev) |
| 154 | { |
| 155 | struct pcmcia_socket *socket; |
| 156 | |
| 157 | down_read(&pcmcia_socket_list_rwsem); |
| 158 | list_for_each_entry(socket, &pcmcia_socket_list, socket_list) { |
| 159 | if (socket->dev.dev != dev) |
| 160 | continue; |
| 161 | down(&socket->skt_sem); |
| 162 | socket_resume(socket); |
| 163 | up(&socket->skt_sem); |
| 164 | } |
| 165 | up_read(&pcmcia_socket_list_rwsem); |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | EXPORT_SYMBOL(pcmcia_socket_dev_resume); |
| 170 | |
| 171 | |
| 172 | struct pcmcia_socket * pcmcia_get_socket(struct pcmcia_socket *skt) |
| 173 | { |
| 174 | struct class_device *cl_dev = class_device_get(&skt->dev); |
| 175 | if (!cl_dev) |
| 176 | return NULL; |
| 177 | skt = class_get_devdata(cl_dev); |
| 178 | if (!try_module_get(skt->owner)) { |
| 179 | class_device_put(&skt->dev); |
| 180 | return NULL; |
| 181 | } |
| 182 | return (skt); |
| 183 | } |
| 184 | EXPORT_SYMBOL(pcmcia_get_socket); |
| 185 | |
| 186 | |
| 187 | void pcmcia_put_socket(struct pcmcia_socket *skt) |
| 188 | { |
| 189 | module_put(skt->owner); |
| 190 | class_device_put(&skt->dev); |
| 191 | } |
| 192 | EXPORT_SYMBOL(pcmcia_put_socket); |
| 193 | |
| 194 | |
| 195 | static void pcmcia_release_socket(struct class_device *class_dev) |
| 196 | { |
| 197 | struct pcmcia_socket *socket = class_get_devdata(class_dev); |
| 198 | |
| 199 | complete(&socket->socket_released); |
| 200 | } |
| 201 | |
| 202 | static int pccardd(void *__skt); |
| 203 | |
| 204 | /** |
| 205 | * pcmcia_register_socket - add a new pcmcia socket device |
| 206 | */ |
| 207 | int pcmcia_register_socket(struct pcmcia_socket *socket) |
| 208 | { |
| 209 | int ret; |
| 210 | |
| 211 | if (!socket || !socket->ops || !socket->dev.dev || !socket->resource_ops) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | cs_dbg(socket, 0, "pcmcia_register_socket(0x%p)\n", socket->ops); |
| 215 | |
| 216 | spin_lock_init(&socket->lock); |
| 217 | |
| 218 | if (socket->resource_ops->init) { |
| 219 | ret = socket->resource_ops->init(socket); |
| 220 | if (ret) |
| 221 | return (ret); |
| 222 | } |
| 223 | |
| 224 | /* try to obtain a socket number [yes, it gets ugly if we |
| 225 | * register more than 2^sizeof(unsigned int) pcmcia |
| 226 | * sockets... but the socket number is deprecated |
| 227 | * anyways, so I don't care] */ |
| 228 | down_write(&pcmcia_socket_list_rwsem); |
| 229 | if (list_empty(&pcmcia_socket_list)) |
| 230 | socket->sock = 0; |
| 231 | else { |
| 232 | unsigned int found, i = 1; |
| 233 | struct pcmcia_socket *tmp; |
| 234 | do { |
| 235 | found = 1; |
| 236 | list_for_each_entry(tmp, &pcmcia_socket_list, socket_list) { |
| 237 | if (tmp->sock == i) |
| 238 | found = 0; |
| 239 | } |
| 240 | i++; |
| 241 | } while (!found); |
| 242 | socket->sock = i - 1; |
| 243 | } |
| 244 | list_add_tail(&socket->socket_list, &pcmcia_socket_list); |
| 245 | up_write(&pcmcia_socket_list_rwsem); |
| 246 | |
| 247 | |
| 248 | /* set proper values in socket->dev */ |
| 249 | socket->dev.class_data = socket; |
| 250 | socket->dev.class = &pcmcia_socket_class; |
| 251 | snprintf(socket->dev.class_id, BUS_ID_SIZE, "pcmcia_socket%u", socket->sock); |
| 252 | |
| 253 | /* base address = 0, map = 0 */ |
| 254 | socket->cis_mem.flags = 0; |
| 255 | socket->cis_mem.speed = cis_speed; |
| 256 | |
| 257 | INIT_LIST_HEAD(&socket->cis_cache); |
| 258 | |
| 259 | init_completion(&socket->socket_released); |
| 260 | init_completion(&socket->thread_done); |
| 261 | init_waitqueue_head(&socket->thread_wait); |
| 262 | init_MUTEX(&socket->skt_sem); |
| 263 | spin_lock_init(&socket->thread_lock); |
| 264 | |
| 265 | ret = kernel_thread(pccardd, socket, CLONE_KERNEL); |
| 266 | if (ret < 0) |
| 267 | goto err; |
| 268 | |
| 269 | wait_for_completion(&socket->thread_done); |
| 270 | if(!socket->thread) { |
| 271 | printk(KERN_WARNING "PCMCIA: warning: socket thread for socket %p did not start\n", socket); |
| 272 | return -EIO; |
| 273 | } |
| 274 | pcmcia_parse_events(socket, SS_DETECT); |
| 275 | |
| 276 | return 0; |
| 277 | |
| 278 | err: |
| 279 | down_write(&pcmcia_socket_list_rwsem); |
| 280 | list_del(&socket->socket_list); |
| 281 | up_write(&pcmcia_socket_list_rwsem); |
| 282 | return ret; |
| 283 | } /* pcmcia_register_socket */ |
| 284 | EXPORT_SYMBOL(pcmcia_register_socket); |
| 285 | |
| 286 | |
| 287 | /** |
| 288 | * pcmcia_unregister_socket - remove a pcmcia socket device |
| 289 | */ |
| 290 | void pcmcia_unregister_socket(struct pcmcia_socket *socket) |
| 291 | { |
| 292 | if (!socket) |
| 293 | return; |
| 294 | |
| 295 | cs_dbg(socket, 0, "pcmcia_unregister_socket(0x%p)\n", socket->ops); |
| 296 | |
| 297 | if (socket->thread) { |
| 298 | init_completion(&socket->thread_done); |
| 299 | socket->thread = NULL; |
| 300 | wake_up(&socket->thread_wait); |
| 301 | wait_for_completion(&socket->thread_done); |
| 302 | } |
| 303 | release_cis_mem(socket); |
| 304 | |
| 305 | /* remove from our own list */ |
| 306 | down_write(&pcmcia_socket_list_rwsem); |
| 307 | list_del(&socket->socket_list); |
| 308 | up_write(&pcmcia_socket_list_rwsem); |
| 309 | |
| 310 | /* wait for sysfs to drop all references */ |
| 311 | release_resource_db(socket); |
| 312 | wait_for_completion(&socket->socket_released); |
| 313 | } /* pcmcia_unregister_socket */ |
| 314 | EXPORT_SYMBOL(pcmcia_unregister_socket); |
| 315 | |
| 316 | |
| 317 | struct pcmcia_socket * pcmcia_get_socket_by_nr(unsigned int nr) |
| 318 | { |
| 319 | struct pcmcia_socket *s; |
| 320 | |
| 321 | down_read(&pcmcia_socket_list_rwsem); |
| 322 | list_for_each_entry(s, &pcmcia_socket_list, socket_list) |
| 323 | if (s->sock == nr) { |
| 324 | up_read(&pcmcia_socket_list_rwsem); |
| 325 | return s; |
| 326 | } |
| 327 | up_read(&pcmcia_socket_list_rwsem); |
| 328 | |
| 329 | return NULL; |
| 330 | |
| 331 | } |
| 332 | EXPORT_SYMBOL(pcmcia_get_socket_by_nr); |
| 333 | |
| 334 | |
| 335 | /*====================================================================== |
| 336 | |
| 337 | socket_setup() and shutdown_socket() are called by the main event |
| 338 | handler when card insertion and removal events are received. |
| 339 | socket_setup() turns on socket power and resets the socket, in two stages. |
| 340 | shutdown_socket() unconfigures a socket and turns off socket power. |
| 341 | |
| 342 | ======================================================================*/ |
| 343 | |
| 344 | static void shutdown_socket(struct pcmcia_socket *s) |
| 345 | { |
| 346 | cs_dbg(s, 1, "shutdown_socket\n"); |
| 347 | |
| 348 | /* Blank out the socket state */ |
| 349 | s->socket = dead_socket; |
| 350 | s->ops->init(s); |
| 351 | s->ops->set_socket(s, &s->socket); |
| 352 | s->irq.AssignedIRQ = s->irq.Config = 0; |
| 353 | s->lock_count = 0; |
| 354 | destroy_cis_cache(s); |
| 355 | #ifdef CONFIG_CARDBUS |
| 356 | cb_free(s); |
| 357 | #endif |
| 358 | s->functions = 0; |
| 359 | if (s->config) { |
| 360 | kfree(s->config); |
| 361 | s->config = NULL; |
| 362 | } |
| 363 | |
| 364 | { |
| 365 | int status; |
| 366 | s->ops->get_status(s, &status); |
| 367 | if (status & SS_POWERON) { |
| 368 | printk(KERN_ERR "PCMCIA: socket %p: *** DANGER *** unable to remove socket power\n", s); |
| 369 | } |
| 370 | } |
| 371 | } /* shutdown_socket */ |
| 372 | |
| 373 | /*====================================================================== |
| 374 | |
| 375 | The central event handler. Send_event() sends an event to the |
| 376 | 16-bit subsystem, which then calls the relevant device drivers. |
| 377 | Parse_events() interprets the event bits from |
| 378 | a card status change report. Do_shutdown() handles the high |
| 379 | priority stuff associated with a card removal. |
| 380 | |
| 381 | ======================================================================*/ |
| 382 | |
| 383 | |
| 384 | /* NOTE: send_event needs to be called with skt->sem held. */ |
| 385 | |
| 386 | static int send_event(struct pcmcia_socket *s, event_t event, int priority) |
| 387 | { |
| 388 | int ret; |
| 389 | |
| 390 | if (s->state & SOCKET_CARDBUS) |
| 391 | return 0; |
| 392 | |
| 393 | cs_dbg(s, 1, "send_event(event %d, pri %d, callback 0x%p)\n", |
| 394 | event, priority, s->callback); |
| 395 | |
| 396 | if (!s->callback) |
| 397 | return 0; |
| 398 | if (!try_module_get(s->callback->owner)) |
| 399 | return 0; |
| 400 | |
| 401 | ret = s->callback->event(s, event, priority); |
| 402 | |
| 403 | module_put(s->callback->owner); |
| 404 | |
| 405 | return ret; |
| 406 | } |
| 407 | |
| 408 | static void socket_remove_drivers(struct pcmcia_socket *skt) |
| 409 | { |
| 410 | cs_dbg(skt, 4, "remove_drivers\n"); |
| 411 | |
| 412 | send_event(skt, CS_EVENT_CARD_REMOVAL, CS_EVENT_PRI_HIGH); |
| 413 | } |
| 414 | |
| 415 | static void socket_shutdown(struct pcmcia_socket *skt) |
| 416 | { |
| 417 | cs_dbg(skt, 4, "shutdown\n"); |
| 418 | |
| 419 | socket_remove_drivers(skt); |
| 420 | skt->state &= SOCKET_INUSE|SOCKET_PRESENT; |
| 421 | msleep(shutdown_delay * 10); |
| 422 | skt->state &= SOCKET_INUSE; |
| 423 | shutdown_socket(skt); |
| 424 | } |
| 425 | |
| 426 | static int socket_reset(struct pcmcia_socket *skt) |
| 427 | { |
| 428 | int status, i; |
| 429 | |
| 430 | cs_dbg(skt, 4, "reset\n"); |
| 431 | |
| 432 | skt->socket.flags |= SS_OUTPUT_ENA | SS_RESET; |
| 433 | skt->ops->set_socket(skt, &skt->socket); |
| 434 | udelay((long)reset_time); |
| 435 | |
| 436 | skt->socket.flags &= ~SS_RESET; |
| 437 | skt->ops->set_socket(skt, &skt->socket); |
| 438 | |
| 439 | msleep(unreset_delay * 10); |
| 440 | for (i = 0; i < unreset_limit; i++) { |
| 441 | skt->ops->get_status(skt, &status); |
| 442 | |
| 443 | if (!(status & SS_DETECT)) |
| 444 | return CS_NO_CARD; |
| 445 | |
| 446 | if (status & SS_READY) |
| 447 | return CS_SUCCESS; |
| 448 | |
| 449 | msleep(unreset_check * 10); |
| 450 | } |
| 451 | |
| 452 | cs_err(skt, "time out after reset.\n"); |
| 453 | return CS_GENERAL_FAILURE; |
| 454 | } |
| 455 | |
| 456 | static int socket_setup(struct pcmcia_socket *skt, int initial_delay) |
| 457 | { |
| 458 | int status, i; |
| 459 | |
| 460 | cs_dbg(skt, 4, "setup\n"); |
| 461 | |
| 462 | skt->ops->get_status(skt, &status); |
| 463 | if (!(status & SS_DETECT)) |
| 464 | return CS_NO_CARD; |
| 465 | |
| 466 | msleep(initial_delay * 10); |
| 467 | |
| 468 | for (i = 0; i < 100; i++) { |
| 469 | skt->ops->get_status(skt, &status); |
| 470 | if (!(status & SS_DETECT)) |
| 471 | return CS_NO_CARD; |
| 472 | |
| 473 | if (!(status & SS_PENDING)) |
| 474 | break; |
| 475 | |
| 476 | msleep(100); |
| 477 | } |
| 478 | |
| 479 | if (status & SS_PENDING) { |
| 480 | cs_err(skt, "voltage interrogation timed out.\n"); |
| 481 | return CS_GENERAL_FAILURE; |
| 482 | } |
| 483 | |
| 484 | if (status & SS_CARDBUS) { |
| 485 | skt->state |= SOCKET_CARDBUS; |
| 486 | #ifndef CONFIG_CARDBUS |
| 487 | cs_err(skt, "cardbus cards are not supported.\n"); |
| 488 | return CS_BAD_TYPE; |
| 489 | #endif |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Decode the card voltage requirements, and apply power to the card. |
| 494 | */ |
| 495 | if (status & SS_3VCARD) |
| 496 | skt->socket.Vcc = skt->socket.Vpp = 33; |
| 497 | else if (!(status & SS_XVCARD)) |
| 498 | skt->socket.Vcc = skt->socket.Vpp = 50; |
| 499 | else { |
| 500 | cs_err(skt, "unsupported voltage key.\n"); |
| 501 | return CS_BAD_TYPE; |
| 502 | } |
Daniel Ritz | fa912bc | 2005-06-23 00:10:12 -0700 | [diff] [blame] | 503 | |
| 504 | if (skt->power_hook) |
| 505 | skt->power_hook(skt, HOOK_POWER_PRE); |
| 506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | skt->socket.flags = 0; |
| 508 | skt->ops->set_socket(skt, &skt->socket); |
| 509 | |
| 510 | /* |
| 511 | * Wait "vcc_settle" for the supply to stabilise. |
| 512 | */ |
| 513 | msleep(vcc_settle * 10); |
| 514 | |
| 515 | skt->ops->get_status(skt, &status); |
| 516 | if (!(status & SS_POWERON)) { |
| 517 | cs_err(skt, "unable to apply power.\n"); |
| 518 | return CS_BAD_TYPE; |
| 519 | } |
| 520 | |
Daniel Ritz | fa912bc | 2005-06-23 00:10:12 -0700 | [diff] [blame] | 521 | status = socket_reset(skt); |
| 522 | |
| 523 | if (skt->power_hook) |
| 524 | skt->power_hook(skt, HOOK_POWER_POST); |
| 525 | |
| 526 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | /* |
| 530 | * Handle card insertion. Setup the socket, reset the card, |
| 531 | * and then tell the rest of PCMCIA that a card is present. |
| 532 | */ |
| 533 | static int socket_insert(struct pcmcia_socket *skt) |
| 534 | { |
| 535 | int ret; |
| 536 | |
| 537 | cs_dbg(skt, 4, "insert\n"); |
| 538 | |
| 539 | if (!cs_socket_get(skt)) |
| 540 | return CS_NO_CARD; |
| 541 | |
| 542 | ret = socket_setup(skt, setup_delay); |
| 543 | if (ret == CS_SUCCESS) { |
| 544 | skt->state |= SOCKET_PRESENT; |
| 545 | #ifdef CONFIG_CARDBUS |
| 546 | if (skt->state & SOCKET_CARDBUS) { |
| 547 | cb_alloc(skt); |
| 548 | skt->state |= SOCKET_CARDBUS_CONFIG; |
| 549 | } |
| 550 | #endif |
| 551 | cs_dbg(skt, 4, "insert done\n"); |
| 552 | |
| 553 | send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); |
| 554 | } else { |
| 555 | socket_shutdown(skt); |
| 556 | cs_socket_put(skt); |
| 557 | } |
| 558 | |
| 559 | return ret; |
| 560 | } |
| 561 | |
| 562 | static int socket_suspend(struct pcmcia_socket *skt) |
| 563 | { |
| 564 | if (skt->state & SOCKET_SUSPEND) |
| 565 | return CS_IN_USE; |
| 566 | |
| 567 | send_event(skt, CS_EVENT_PM_SUSPEND, CS_EVENT_PRI_LOW); |
| 568 | skt->socket = dead_socket; |
| 569 | skt->ops->set_socket(skt, &skt->socket); |
| 570 | if (skt->ops->suspend) |
| 571 | skt->ops->suspend(skt); |
| 572 | skt->state |= SOCKET_SUSPEND; |
| 573 | |
| 574 | return CS_SUCCESS; |
| 575 | } |
| 576 | |
| 577 | /* |
| 578 | * Resume a socket. If a card is present, verify its CIS against |
| 579 | * our cached copy. If they are different, the card has been |
| 580 | * replaced, and we need to tell the drivers. |
| 581 | */ |
| 582 | static int socket_resume(struct pcmcia_socket *skt) |
| 583 | { |
| 584 | int ret; |
| 585 | |
| 586 | if (!(skt->state & SOCKET_SUSPEND)) |
| 587 | return CS_IN_USE; |
| 588 | |
| 589 | skt->socket = dead_socket; |
| 590 | skt->ops->init(skt); |
| 591 | skt->ops->set_socket(skt, &skt->socket); |
| 592 | |
| 593 | if (!(skt->state & SOCKET_PRESENT)) { |
| 594 | skt->state &= ~SOCKET_SUSPEND; |
| 595 | return socket_insert(skt); |
| 596 | } |
| 597 | |
| 598 | ret = socket_setup(skt, resume_delay); |
| 599 | if (ret == CS_SUCCESS) { |
| 600 | /* |
| 601 | * FIXME: need a better check here for cardbus cards. |
| 602 | */ |
| 603 | if (verify_cis_cache(skt) != 0) { |
| 604 | cs_dbg(skt, 4, "cis mismatch - different card\n"); |
| 605 | socket_remove_drivers(skt); |
| 606 | destroy_cis_cache(skt); |
| 607 | /* |
| 608 | * Workaround: give DS time to schedule removal. |
| 609 | * Remove me once the 100ms delay is eliminated |
| 610 | * in ds.c |
| 611 | */ |
| 612 | msleep(200); |
| 613 | send_event(skt, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); |
| 614 | } else { |
| 615 | cs_dbg(skt, 4, "cis matches cache\n"); |
| 616 | send_event(skt, CS_EVENT_PM_RESUME, CS_EVENT_PRI_LOW); |
| 617 | } |
| 618 | } else { |
| 619 | socket_shutdown(skt); |
| 620 | cs_socket_put(skt); |
| 621 | } |
| 622 | |
| 623 | skt->state &= ~SOCKET_SUSPEND; |
| 624 | |
| 625 | return CS_SUCCESS; |
| 626 | } |
| 627 | |
| 628 | static void socket_remove(struct pcmcia_socket *skt) |
| 629 | { |
| 630 | socket_shutdown(skt); |
| 631 | cs_socket_put(skt); |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * Process a socket card detect status change. |
| 636 | * |
| 637 | * If we don't have a card already present, delay the detect event for |
| 638 | * about 20ms (to be on the safe side) before reading the socket status. |
| 639 | * |
| 640 | * Some i82365-based systems send multiple SS_DETECT events during card |
| 641 | * insertion, and the "card present" status bit seems to bounce. This |
| 642 | * will probably be true with GPIO-based card detection systems after |
| 643 | * the product has aged. |
| 644 | */ |
| 645 | static void socket_detect_change(struct pcmcia_socket *skt) |
| 646 | { |
| 647 | if (!(skt->state & SOCKET_SUSPEND)) { |
| 648 | int status; |
| 649 | |
| 650 | if (!(skt->state & SOCKET_PRESENT)) |
| 651 | msleep(20); |
| 652 | |
| 653 | skt->ops->get_status(skt, &status); |
| 654 | if ((skt->state & SOCKET_PRESENT) && |
| 655 | !(status & SS_DETECT)) |
| 656 | socket_remove(skt); |
| 657 | if (!(skt->state & SOCKET_PRESENT) && |
| 658 | (status & SS_DETECT)) |
| 659 | socket_insert(skt); |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | static int pccardd(void *__skt) |
| 664 | { |
| 665 | struct pcmcia_socket *skt = __skt; |
| 666 | DECLARE_WAITQUEUE(wait, current); |
| 667 | int ret; |
| 668 | |
| 669 | daemonize("pccardd"); |
| 670 | |
| 671 | skt->thread = current; |
| 672 | skt->socket = dead_socket; |
| 673 | skt->ops->init(skt); |
| 674 | skt->ops->set_socket(skt, &skt->socket); |
| 675 | |
| 676 | /* register with the device core */ |
| 677 | ret = class_device_register(&skt->dev); |
| 678 | if (ret) { |
| 679 | printk(KERN_WARNING "PCMCIA: unable to register socket 0x%p\n", |
| 680 | skt); |
| 681 | skt->thread = NULL; |
| 682 | complete_and_exit(&skt->thread_done, 0); |
| 683 | } |
| 684 | complete(&skt->thread_done); |
| 685 | |
| 686 | add_wait_queue(&skt->thread_wait, &wait); |
| 687 | for (;;) { |
| 688 | unsigned long flags; |
| 689 | unsigned int events; |
| 690 | |
| 691 | set_current_state(TASK_INTERRUPTIBLE); |
| 692 | |
| 693 | spin_lock_irqsave(&skt->thread_lock, flags); |
| 694 | events = skt->thread_events; |
| 695 | skt->thread_events = 0; |
| 696 | spin_unlock_irqrestore(&skt->thread_lock, flags); |
| 697 | |
| 698 | if (events) { |
| 699 | down(&skt->skt_sem); |
| 700 | if (events & SS_DETECT) |
| 701 | socket_detect_change(skt); |
| 702 | if (events & SS_BATDEAD) |
| 703 | send_event(skt, CS_EVENT_BATTERY_DEAD, CS_EVENT_PRI_LOW); |
| 704 | if (events & SS_BATWARN) |
| 705 | send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW); |
| 706 | if (events & SS_READY) |
| 707 | send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW); |
| 708 | up(&skt->skt_sem); |
| 709 | continue; |
| 710 | } |
| 711 | |
| 712 | schedule(); |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 713 | try_to_freeze(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
| 715 | if (!skt->thread) |
| 716 | break; |
| 717 | } |
| 718 | remove_wait_queue(&skt->thread_wait, &wait); |
| 719 | |
| 720 | /* remove from the device core */ |
| 721 | class_device_unregister(&skt->dev); |
| 722 | |
| 723 | complete_and_exit(&skt->thread_done, 0); |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * Yenta (at least) probes interrupts before registering the socket and |
| 728 | * starting the handler thread. |
| 729 | */ |
| 730 | void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) |
| 731 | { |
| 732 | cs_dbg(s, 4, "parse_events: events %08x\n", events); |
| 733 | if (s->thread) { |
| 734 | spin_lock(&s->thread_lock); |
| 735 | s->thread_events |= events; |
| 736 | spin_unlock(&s->thread_lock); |
| 737 | |
| 738 | wake_up(&s->thread_wait); |
| 739 | } |
| 740 | } /* pcmcia_parse_events */ |
| 741 | |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | /*===================================================================== |
| 744 | |
| 745 | Return the PCI device associated with a card.. |
| 746 | |
| 747 | ======================================================================*/ |
| 748 | |
| 749 | #ifdef CONFIG_CARDBUS |
| 750 | |
| 751 | struct pci_bus *pcmcia_lookup_bus(struct pcmcia_socket *s) |
| 752 | { |
| 753 | if (!s || !(s->state & SOCKET_CARDBUS)) |
| 754 | return NULL; |
| 755 | |
| 756 | return s->cb_dev->subordinate; |
| 757 | } |
| 758 | |
| 759 | EXPORT_SYMBOL(pcmcia_lookup_bus); |
| 760 | |
| 761 | #endif |
| 762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
| 764 | /* register pcmcia_callback */ |
| 765 | int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) |
| 766 | { |
| 767 | int ret = 0; |
| 768 | |
| 769 | /* s->skt_sem also protects s->callback */ |
| 770 | down(&s->skt_sem); |
| 771 | |
| 772 | if (c) { |
| 773 | /* registration */ |
| 774 | if (s->callback) { |
| 775 | ret = -EBUSY; |
| 776 | goto err; |
| 777 | } |
| 778 | |
| 779 | s->callback = c; |
| 780 | |
| 781 | if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) |
| 782 | send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); |
| 783 | } else |
| 784 | s->callback = NULL; |
| 785 | err: |
| 786 | up(&s->skt_sem); |
| 787 | |
| 788 | return ret; |
| 789 | } |
| 790 | EXPORT_SYMBOL(pccard_register_pcmcia); |
| 791 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
| 793 | /*====================================================================== |
| 794 | |
| 795 | I'm not sure which "reset" function this is supposed to use, |
| 796 | but for now, it uses the low-level interface's reset, not the |
| 797 | CIS register. |
| 798 | |
| 799 | ======================================================================*/ |
| 800 | |
| 801 | int pccard_reset_card(struct pcmcia_socket *skt) |
| 802 | { |
| 803 | int ret; |
| 804 | |
| 805 | cs_dbg(skt, 1, "resetting socket\n"); |
| 806 | |
| 807 | down(&skt->skt_sem); |
| 808 | do { |
| 809 | if (!(skt->state & SOCKET_PRESENT)) { |
| 810 | ret = CS_NO_CARD; |
| 811 | break; |
| 812 | } |
| 813 | if (skt->state & SOCKET_SUSPEND) { |
| 814 | ret = CS_IN_USE; |
| 815 | break; |
| 816 | } |
| 817 | if (skt->state & SOCKET_CARDBUS) { |
| 818 | ret = CS_UNSUPPORTED_FUNCTION; |
| 819 | break; |
| 820 | } |
| 821 | |
| 822 | ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); |
| 823 | if (ret == 0) { |
| 824 | send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); |
| 825 | if (socket_reset(skt) == CS_SUCCESS) |
| 826 | send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); |
| 827 | } |
| 828 | |
| 829 | ret = CS_SUCCESS; |
| 830 | } while (0); |
| 831 | up(&skt->skt_sem); |
| 832 | |
| 833 | return ret; |
| 834 | } /* reset_card */ |
| 835 | EXPORT_SYMBOL(pccard_reset_card); |
| 836 | |
| 837 | /*====================================================================== |
| 838 | |
| 839 | These shut down or wake up a socket. They are sort of user |
| 840 | initiated versions of the APM suspend and resume actions. |
| 841 | |
| 842 | ======================================================================*/ |
| 843 | |
| 844 | int pcmcia_suspend_card(struct pcmcia_socket *skt) |
| 845 | { |
| 846 | int ret; |
| 847 | |
| 848 | cs_dbg(skt, 1, "suspending socket\n"); |
| 849 | |
| 850 | down(&skt->skt_sem); |
| 851 | do { |
| 852 | if (!(skt->state & SOCKET_PRESENT)) { |
| 853 | ret = CS_NO_CARD; |
| 854 | break; |
| 855 | } |
| 856 | if (skt->state & SOCKET_CARDBUS) { |
| 857 | ret = CS_UNSUPPORTED_FUNCTION; |
| 858 | break; |
| 859 | } |
| 860 | ret = socket_suspend(skt); |
| 861 | } while (0); |
| 862 | up(&skt->skt_sem); |
| 863 | |
| 864 | return ret; |
| 865 | } /* suspend_card */ |
| 866 | |
| 867 | int pcmcia_resume_card(struct pcmcia_socket *skt) |
| 868 | { |
| 869 | int ret; |
| 870 | |
| 871 | cs_dbg(skt, 1, "waking up socket\n"); |
| 872 | |
| 873 | down(&skt->skt_sem); |
| 874 | do { |
| 875 | if (!(skt->state & SOCKET_PRESENT)) { |
| 876 | ret = CS_NO_CARD; |
| 877 | break; |
| 878 | } |
| 879 | if (skt->state & SOCKET_CARDBUS) { |
| 880 | ret = CS_UNSUPPORTED_FUNCTION; |
| 881 | break; |
| 882 | } |
| 883 | ret = socket_resume(skt); |
| 884 | } while (0); |
| 885 | up(&skt->skt_sem); |
| 886 | |
| 887 | return ret; |
| 888 | } /* resume_card */ |
| 889 | |
| 890 | /*====================================================================== |
| 891 | |
| 892 | These handle user requests to eject or insert a card. |
| 893 | |
| 894 | ======================================================================*/ |
| 895 | |
| 896 | int pcmcia_eject_card(struct pcmcia_socket *skt) |
| 897 | { |
| 898 | int ret; |
| 899 | |
| 900 | cs_dbg(skt, 1, "user eject request\n"); |
| 901 | |
| 902 | down(&skt->skt_sem); |
| 903 | do { |
| 904 | if (!(skt->state & SOCKET_PRESENT)) { |
| 905 | ret = -ENODEV; |
| 906 | break; |
| 907 | } |
| 908 | |
| 909 | ret = send_event(skt, CS_EVENT_EJECTION_REQUEST, CS_EVENT_PRI_LOW); |
| 910 | if (ret != 0) { |
| 911 | ret = -EINVAL; |
| 912 | break; |
| 913 | } |
| 914 | |
| 915 | socket_remove(skt); |
| 916 | ret = 0; |
| 917 | } while (0); |
| 918 | up(&skt->skt_sem); |
| 919 | |
| 920 | return ret; |
| 921 | } /* eject_card */ |
| 922 | |
| 923 | int pcmcia_insert_card(struct pcmcia_socket *skt) |
| 924 | { |
| 925 | int ret; |
| 926 | |
| 927 | cs_dbg(skt, 1, "user insert request\n"); |
| 928 | |
| 929 | down(&skt->skt_sem); |
| 930 | do { |
| 931 | if (skt->state & SOCKET_PRESENT) { |
| 932 | ret = -EBUSY; |
| 933 | break; |
| 934 | } |
| 935 | if (socket_insert(skt) == CS_NO_CARD) { |
| 936 | ret = -ENODEV; |
| 937 | break; |
| 938 | } |
| 939 | ret = 0; |
| 940 | } while (0); |
| 941 | up(&skt->skt_sem); |
| 942 | |
| 943 | return ret; |
| 944 | } /* insert_card */ |
| 945 | |
Dominik Brodowski | 3ee1393 | 2005-06-27 16:28:05 -0700 | [diff] [blame] | 946 | static int pcmcia_socket_hotplug(struct class_device *dev, char **envp, |
| 947 | int num_envp, char *buffer, int buffer_size) |
| 948 | { |
| 949 | struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); |
| 950 | int i = 0, length = 0; |
| 951 | |
| 952 | if (add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, |
| 953 | &length, "SOCKET_NO=%u", s->sock)) |
| 954 | return -ENOMEM; |
| 955 | |
| 956 | envp[i] = NULL; |
| 957 | |
| 958 | return 0; |
| 959 | } |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | /*====================================================================== |
| 962 | |
| 963 | OS-specific module glue goes here |
| 964 | |
| 965 | ======================================================================*/ |
| 966 | /* in alpha order */ |
| 967 | EXPORT_SYMBOL(pcmcia_eject_card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | EXPORT_SYMBOL(pcmcia_insert_card); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | EXPORT_SYMBOL(pcmcia_replace_cis); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | EXPORT_SYMBOL(pcmcia_resume_card); |
| 971 | EXPORT_SYMBOL(pcmcia_suspend_card); |
| 972 | |
| 973 | EXPORT_SYMBOL(dead_socket); |
| 974 | EXPORT_SYMBOL(pcmcia_parse_events); |
| 975 | |
| 976 | struct class pcmcia_socket_class = { |
| 977 | .name = "pcmcia_socket", |
Dominik Brodowski | 3ee1393 | 2005-06-27 16:28:05 -0700 | [diff] [blame] | 978 | .hotplug = pcmcia_socket_hotplug, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | .release = pcmcia_release_socket, |
| 980 | }; |
| 981 | EXPORT_SYMBOL(pcmcia_socket_class); |
| 982 | |
| 983 | |
| 984 | static int __init init_pcmcia_cs(void) |
| 985 | { |
| 986 | int ret; |
| 987 | printk(KERN_INFO "%s\n", release); |
| 988 | printk(KERN_INFO " %s\n", options); |
| 989 | |
| 990 | ret = class_register(&pcmcia_socket_class); |
| 991 | if (ret) |
| 992 | return (ret); |
| 993 | return class_interface_register(&pccard_sysfs_interface); |
| 994 | } |
| 995 | |
| 996 | static void __exit exit_pcmcia_cs(void) |
| 997 | { |
| 998 | printk(KERN_INFO "unloading Kernel Card Services\n"); |
| 999 | class_interface_unregister(&pccard_sysfs_interface); |
| 1000 | class_unregister(&pcmcia_socket_class); |
| 1001 | } |
| 1002 | |
| 1003 | subsys_initcall(init_pcmcia_cs); |
| 1004 | module_exit(exit_pcmcia_cs); |
| 1005 | |
| 1006 | /*====================================================================*/ |
| 1007 | |