| | 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_RESUME) && |
| | 675 | !(skt->state & SOCKET_CARDBUS)) { |
| | 676 | ret = socket_resume(skt); |
| | 677 | if (!ret && skt->callback) |
| | 678 | skt->callback->resume(skt); |
| | 679 | } |
| | 680 | if ((sysfs_events & PCMCIA_UEVENT_SUSPEND) && |
| | 681 | !(skt->state & SOCKET_CARDBUS)) { |
| | 682 | if (skt->callback) |
| | 683 | ret = skt->callback->suspend(skt); |
| | 684 | else |
| | 685 | ret = 0; |
| | 686 | if (!ret) |
| | 687 | socket_suspend(skt); |
| | 688 | } |
| | 689 | if ((sysfs_events & PCMCIA_UEVENT_REQUERY) && |
| | 690 | !(skt->state & SOCKET_CARDBUS)) { |
| | 691 | if (!ret && skt->callback) |
| | 692 | skt->callback->requery(skt); |
| | 693 | } |
| | 694 | } |
| | 695 | mutex_unlock(&skt->skt_mutex); |
| | 696 | |
| | 697 | if (events || sysfs_events) |
| | 698 | continue; |
| | 699 | |
| | 700 | if (kthread_should_stop()) |
| | 701 | break; |
| | 702 | |
| | 703 | schedule(); |
| | 704 | try_to_freeze(); |
| | 705 | } |
| | 706 | /* make sure we are running before we exit */ |
| | 707 | set_current_state(TASK_RUNNING); |
| | 708 | |
| | 709 | /* shut down socket, if a device is still present */ |
| | 710 | if (skt->state & SOCKET_PRESENT) { |
| | 711 | mutex_lock(&skt->skt_mutex); |
| | 712 | socket_remove(skt); |
| | 713 | mutex_unlock(&skt->skt_mutex); |
| | 714 | } |
| | 715 | |
| | 716 | /* remove from the device core */ |
| | 717 | pccard_sysfs_remove_socket(&skt->dev); |
| | 718 | device_unregister(&skt->dev); |
| | 719 | |
| | 720 | return 0; |
| | 721 | } |
| | 722 | |
| | 723 | /* |
| | 724 | * Yenta (at least) probes interrupts before registering the socket and |
| | 725 | * starting the handler thread. |
| | 726 | */ |
| | 727 | void pcmcia_parse_events(struct pcmcia_socket *s, u_int events) |
| | 728 | { |
| | 729 | unsigned long flags; |
| | 730 | dev_dbg(&s->dev, "parse_events: events %08x\n", events); |
| | 731 | if (s->thread) { |
| | 732 | spin_lock_irqsave(&s->thread_lock, flags); |
| | 733 | s->thread_events |= events; |
| | 734 | spin_unlock_irqrestore(&s->thread_lock, flags); |
| | 735 | |
| | 736 | wake_up_process(s->thread); |
| | 737 | } |
| | 738 | } /* pcmcia_parse_events */ |
| | 739 | EXPORT_SYMBOL(pcmcia_parse_events); |
| | 740 | |
| | 741 | /** |
| | 742 | * pcmcia_parse_uevents() - tell pccardd to issue manual commands |
| | 743 | * @s: the PCMCIA socket we wan't to command |
| | 744 | * @events: events to pass to pccardd |
| | 745 | * |
| | 746 | * userspace-issued insert, eject, suspend and resume commands must be |
| | 747 | * handled by pccardd to avoid any sysfs-related deadlocks. Valid events |
| | 748 | * are PCMCIA_UEVENT_EJECT (for eject), PCMCIA_UEVENT__INSERT (for insert), |
| | 749 | * PCMCIA_UEVENT_RESUME (for resume), PCMCIA_UEVENT_SUSPEND (for suspend) |
| | 750 | * and PCMCIA_UEVENT_REQUERY (for re-querying the PCMCIA card). |
| | 751 | */ |
| | 752 | void pcmcia_parse_uevents(struct pcmcia_socket *s, u_int events) |
| | 753 | { |
| | 754 | unsigned long flags; |
| | 755 | dev_dbg(&s->dev, "parse_uevents: events %08x\n", events); |
| | 756 | if (s->thread) { |
| | 757 | spin_lock_irqsave(&s->thread_lock, flags); |
| | 758 | s->sysfs_events |= events; |
| | 759 | spin_unlock_irqrestore(&s->thread_lock, flags); |
| | 760 | |
| | 761 | wake_up_process(s->thread); |
| | 762 | } |
| | 763 | } |
| | 764 | EXPORT_SYMBOL(pcmcia_parse_uevents); |
| | 765 | |
| | 766 | |
| | 767 | /* register pcmcia_callback */ |
| | 768 | int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c) |
| | 769 | { |
| | 770 | int ret = 0; |
| | 771 | |
| | 772 | /* s->skt_mutex also protects s->callback */ |
| | 773 | mutex_lock(&s->skt_mutex); |
| | 774 | |
| | 775 | if (c) { |
| | 776 | /* registration */ |
| | 777 | if (s->callback) { |
| | 778 | ret = -EBUSY; |
| | 779 | goto err; |
| | 780 | } |
| | 781 | |
| | 782 | s->callback = c; |
| | 783 | |
| | 784 | if ((s->state & (SOCKET_PRESENT|SOCKET_CARDBUS)) == SOCKET_PRESENT) |
| | 785 | send_event(s, CS_EVENT_CARD_INSERTION, CS_EVENT_PRI_LOW); |
| | 786 | } else |
| | 787 | s->callback = NULL; |
| | 788 | err: |
| | 789 | mutex_unlock(&s->skt_mutex); |
| | 790 | |
| | 791 | return ret; |
| | 792 | } |
| | 793 | EXPORT_SYMBOL(pccard_register_pcmcia); |
| | 794 | |
| | 795 | |
| | 796 | /* I'm not sure which "reset" function this is supposed to use, |
| | 797 | * but for now, it uses the low-level interface's reset, not the |
| | 798 | * CIS register. |
| | 799 | */ |
| | 800 | |
| | 801 | int pcmcia_reset_card(struct pcmcia_socket *skt) |
| | 802 | { |
| | 803 | int ret; |
| | 804 | |
| | 805 | dev_dbg(&skt->dev, "resetting socket\n"); |
| | 806 | |
| | 807 | mutex_lock(&skt->skt_mutex); |
| | 808 | do { |
| | 809 | if (!(skt->state & SOCKET_PRESENT)) { |
| | 810 | dev_dbg(&skt->dev, "can't reset, not present\n"); |
| | 811 | ret = -ENODEV; |
| | 812 | break; |
| | 813 | } |
| | 814 | if (skt->state & SOCKET_SUSPEND) { |
| | 815 | dev_dbg(&skt->dev, "can't reset, suspended\n"); |
| | 816 | ret = -EBUSY; |
| | 817 | break; |
| | 818 | } |
| | 819 | if (skt->state & SOCKET_CARDBUS) { |
| | 820 | dev_dbg(&skt->dev, "can't reset, is cardbus\n"); |
| | 821 | ret = -EPERM; |
| | 822 | break; |
| | 823 | } |
| | 824 | |
| | 825 | ret = send_event(skt, CS_EVENT_RESET_REQUEST, CS_EVENT_PRI_LOW); |
| | 826 | if (ret == 0) { |
| | 827 | send_event(skt, CS_EVENT_RESET_PHYSICAL, CS_EVENT_PRI_LOW); |
| | 828 | if (skt->callback) |
| | 829 | skt->callback->suspend(skt); |
| | 830 | mutex_lock(&skt->ops_mutex); |
| | 831 | ret = socket_reset(skt); |
| | 832 | mutex_unlock(&skt->ops_mutex); |
| | 833 | if (ret == 0) { |
| | 834 | send_event(skt, CS_EVENT_CARD_RESET, CS_EVENT_PRI_LOW); |
| | 835 | if (skt->callback) |
| | 836 | skt->callback->resume(skt); |
| | 837 | } |
| | 838 | } |
| | 839 | |
| | 840 | ret = 0; |
| | 841 | } while (0); |
| | 842 | mutex_unlock(&skt->skt_mutex); |
| | 843 | |
| | 844 | return ret; |
| | 845 | } /* reset_card */ |
| | 846 | EXPORT_SYMBOL(pcmcia_reset_card); |
| | 847 | |
| | 848 | |
| | 849 | static int pcmcia_socket_uevent(struct device *dev, |
| | 850 | struct kobj_uevent_env *env) |
| | 851 | { |
| | 852 | struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); |
| | 853 | |
| | 854 | if (add_uevent_var(env, "SOCKET_NO=%u", s->sock)) |
| | 855 | return -ENOMEM; |
| | 856 | |
| | 857 | return 0; |
| | 858 | } |
| | 859 | |
| | 860 | |
| | 861 | static struct completion pcmcia_unload; |
| | 862 | |
| | 863 | static void pcmcia_release_socket_class(struct class *data) |
| | 864 | { |
| | 865 | complete(&pcmcia_unload); |
| | 866 | } |
| | 867 | |
| | 868 | |
| | 869 | #ifdef CONFIG_PM |
| | 870 | |
| | 871 | static int __pcmcia_pm_op(struct device *dev, |
| | 872 | int (*callback) (struct pcmcia_socket *skt)) |
| | 873 | { |
| | 874 | struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev); |
| | 875 | int ret; |
| | 876 | |
| | 877 | mutex_lock(&s->skt_mutex); |
| | 878 | ret = callback(s); |
| | 879 | mutex_unlock(&s->skt_mutex); |
| | 880 | |
| | 881 | return ret; |
| | 882 | } |
| | 883 | |
| | 884 | static int pcmcia_socket_dev_suspend_noirq(struct device *dev) |
| | 885 | { |
| | 886 | return __pcmcia_pm_op(dev, socket_suspend); |
| | 887 | } |
| | 888 | |
| | 889 | static int pcmcia_socket_dev_resume_noirq(struct device *dev) |
| | 890 | { |
| | 891 | return __pcmcia_pm_op(dev, socket_early_resume); |
| | 892 | } |
| | 893 | |
| | 894 | static int pcmcia_socket_dev_resume(struct device *dev) |
| | 895 | { |
| | 896 | return __pcmcia_pm_op(dev, socket_late_resume); |
| | 897 | } |
| | 898 | |
| | 899 | static const struct dev_pm_ops pcmcia_socket_pm_ops = { |
| | 900 | /* dev_resume may be called with IRQs enabled */ |
| | 901 | SET_SYSTEM_SLEEP_PM_OPS(NULL, |
| | 902 | pcmcia_socket_dev_resume) |
| | 903 | |
| | 904 | /* late suspend must be called with IRQs disabled */ |
| | 905 | .suspend_noirq = pcmcia_socket_dev_suspend_noirq, |
| | 906 | .freeze_noirq = pcmcia_socket_dev_suspend_noirq, |
| | 907 | .poweroff_noirq = pcmcia_socket_dev_suspend_noirq, |
| | 908 | |
| | 909 | /* early resume must be called with IRQs disabled */ |
| | 910 | .resume_noirq = pcmcia_socket_dev_resume_noirq, |
| | 911 | .thaw_noirq = pcmcia_socket_dev_resume_noirq, |
| | 912 | .restore_noirq = pcmcia_socket_dev_resume_noirq, |
| | 913 | }; |
| | 914 | |
| | 915 | #define PCMCIA_SOCKET_CLASS_PM_OPS (&pcmcia_socket_pm_ops) |
| | 916 | |
| | 917 | #else /* CONFIG_PM */ |
| | 918 | |
| | 919 | #define PCMCIA_SOCKET_CLASS_PM_OPS NULL |
| | 920 | |
| | 921 | #endif /* CONFIG_PM */ |
| | 922 | |
| | 923 | struct class pcmcia_socket_class = { |
| | 924 | .name = "pcmcia_socket", |
| | 925 | .dev_uevent = pcmcia_socket_uevent, |
| | 926 | .dev_release = pcmcia_release_socket, |
| | 927 | .class_release = pcmcia_release_socket_class, |
| | 928 | .pm = PCMCIA_SOCKET_CLASS_PM_OPS, |
| | 929 | }; |
| | 930 | EXPORT_SYMBOL(pcmcia_socket_class); |
| | 931 | |
| | 932 | |
| | 933 | static int __init init_pcmcia_cs(void) |
| | 934 | { |
| | 935 | init_completion(&pcmcia_unload); |
| | 936 | return class_register(&pcmcia_socket_class); |
| | 937 | } |
| | 938 | |
| | 939 | static void __exit exit_pcmcia_cs(void) |
| | 940 | { |
| | 941 | class_unregister(&pcmcia_socket_class); |
| | 942 | wait_for_completion(&pcmcia_unload); |
| | 943 | } |
| | 944 | |
| | 945 | subsys_initcall(init_pcmcia_cs); |
| | 946 | module_exit(exit_pcmcia_cs); |
| | 947 | |
projects / linux-2.6-block.git / blame_incremental