drivers/memstick/core/memstick.c

   1 /*
   2  *  Sony MemoryStick support
   3  *
   4  *  Copyright (C) 2007 Alex Dubov <oakad@yahoo.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Special thanks to Carlos Corbacho for providing various MemoryStick cards
  11  * that made this driver possible.
  12  *
  13  */
  14
  15 #include <linux/memstick.h>
  16 #include <linux/idr.h>
  17 #include <linux/fs.h>
  18 #include <linux/delay.h>
  19
  20 #define DRIVER_NAME "memstick"
  21
  22 static unsigned int cmd_retries = 3;
  23 module_param(cmd_retries, uint, 0644);
  24
  25 static struct workqueue_struct *workqueue;
  26 static DEFINE_IDR(memstick_host_idr);
  27 static DEFINE_SPINLOCK(memstick_host_lock);
  28
  29 static int memstick_dev_match(struct memstick_dev *card,
  30                               struct memstick_device_id *id)
  31 {
  32         if (id->match_flags & MEMSTICK_MATCH_ALL) {
  33                 if ((id->type == card->id.type)
  34                     && (id->category == card->id.category)
  35                     && (id->class == card->id.class))
  36                         return 1;
  37         }
  38
  39         return 0;
  40 }
  41
  42 static int memstick_bus_match(struct device *dev, struct device_driver *drv)
  43 {
  44         struct memstick_dev *card = container_of(dev, struct memstick_dev,
  45                                                  dev);
  46         struct memstick_driver *ms_drv = container_of(drv,
  47                                                       struct memstick_driver,
  48                                                       driver);
  49         struct memstick_device_id *ids = ms_drv->id_table;
  50
  51         if (ids) {
  52                 while (ids->match_flags) {
  53                         if (memstick_dev_match(card, ids))
  54                                 return 1;
  55                         ++ids;
  56                 }
  57         }
  58         return 0;
  59 }
  60
  61 static int memstick_uevent(struct device *dev, struct kobj_uevent_env *env)
  62 {
  63         struct memstick_dev *card = container_of(dev, struct memstick_dev,
  64                                                   dev);
  65
  66         if (add_uevent_var(env, "MEMSTICK_TYPE=%02X", card->id.type))
  67                 return -ENOMEM;
  68
  69         if (add_uevent_var(env, "MEMSTICK_CATEGORY=%02X", card->id.category))
  70                 return -ENOMEM;
  71
  72         if (add_uevent_var(env, "MEMSTICK_CLASS=%02X", card->id.class))
  73                 return -ENOMEM;
  74
  75         return 0;
  76 }
  77
  78 static int memstick_device_probe(struct device *dev)
  79 {
  80         struct memstick_dev *card = container_of(dev, struct memstick_dev,
  81                                                  dev);
  82         struct memstick_driver *drv = container_of(dev->driver,
  83                                                    struct memstick_driver,
  84                                                    driver);
  85         int rc = -ENODEV;
  86
  87         if (dev->driver && drv->probe) {
  88                 rc = drv->probe(card);
  89                 if (!rc)
  90                         get_device(dev);
  91         }
  92         return rc;
  93 }
  94
  95 static int memstick_device_remove(struct device *dev)
  96 {
  97         struct memstick_dev *card = container_of(dev, struct memstick_dev,
  98                                                   dev);
  99         struct memstick_driver *drv = container_of(dev->driver,
 100                                                    struct memstick_driver,
 101                                                    driver);
 102
 103         if (dev->driver && drv->remove) {
 104                 drv->remove(card);
 105                 card->dev.driver = NULL;
 106         }
 107
 108         put_device(dev);
 109         return 0;
 110 }
 111
 112 #ifdef CONFIG_PM
 113
 114 static int memstick_device_suspend(struct device *dev, pm_message_t state)
 115 {
 116         struct memstick_dev *card = container_of(dev, struct memstick_dev,
 117                                                   dev);
 118         struct memstick_driver *drv = container_of(dev->driver,
 119                                                    struct memstick_driver,
 120                                                    driver);
 121
 122         if (dev->driver && drv->suspend)
 123                 return drv->suspend(card, state);
 124         return 0;
 125 }
 126
 127 static int memstick_device_resume(struct device *dev)
 128 {
 129         struct memstick_dev *card = container_of(dev, struct memstick_dev,
 130                                                   dev);
 131         struct memstick_driver *drv = container_of(dev->driver,
 132                                                    struct memstick_driver,
 133                                                    driver);
 134
 135         if (dev->driver && drv->resume)
 136                 return drv->resume(card);
 137         return 0;
 138 }
 139
 140 #else
 141
 142 #define memstick_device_suspend NULL
 143 #define memstick_device_resume NULL
 144
 145 #endif /* CONFIG_PM */
 146
 147 #define MEMSTICK_ATTR(name, format)                                           \
 148 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
 149                             char *buf)                                        \
 150 {                                                                             \
 151         struct memstick_dev *card = container_of(dev, struct memstick_dev,    \
 152                                                  dev);                        \
 153         return sprintf(buf, format, card->id.name);                           \
 154 }
 155
 156 MEMSTICK_ATTR(type, "%02X");
 157 MEMSTICK_ATTR(category, "%02X");
 158 MEMSTICK_ATTR(class, "%02X");
 159
 160 #define MEMSTICK_ATTR_RO(name) __ATTR(name, S_IRUGO, name##_show, NULL)
 161
 162 static struct device_attribute memstick_dev_attrs[] = {
 163         MEMSTICK_ATTR_RO(type),
 164         MEMSTICK_ATTR_RO(category),
 165         MEMSTICK_ATTR_RO(class),
 166         __ATTR_NULL
 167 };
 168
 169 static struct bus_type memstick_bus_type = {
 170         .name           = "memstick",
 171         .dev_attrs      = memstick_dev_attrs,
 172         .match          = memstick_bus_match,
 173         .uevent         = memstick_uevent,
 174         .probe          = memstick_device_probe,
 175         .remove         = memstick_device_remove,
 176         .suspend        = memstick_device_suspend,
 177         .resume         = memstick_device_resume
 178 };
 179
 180 static void memstick_free(struct class_device *cdev)
 181 {
 182         struct memstick_host *host = container_of(cdev, struct memstick_host,
 183                                                   cdev);
 184         kfree(host);
 185 }
 186
 187 static struct class memstick_host_class = {
 188         .name       = "memstick_host",
 189         .release    = memstick_free
 190 };
 191
 192 static void memstick_free_card(struct device *dev)
 193 {
 194         struct memstick_dev *card = container_of(dev, struct memstick_dev,
 195                                                  dev);
 196         kfree(card);
 197 }
 198
 199 static int memstick_dummy_check(struct memstick_dev *card)
 200 {
 201         return 0;
 202 }
 203
 204 /**
 205  * memstick_detect_change - schedule media detection on memstick host
 206  * @host - host to use
 207  */
 208 void memstick_detect_change(struct memstick_host *host)
 209 {
 210         queue_work(workqueue, &host->media_checker);
 211 }
 212 EXPORT_SYMBOL(memstick_detect_change);
 213
 214 /**
 215  * memstick_next_req - called by host driver to obtain next request to process
 216  * @host - host to use
 217  * @mrq - pointer to stick the request to
 218  *
 219  * Host calls this function from idle state (*mrq == NULL) or after finishing
 220  * previous request (*mrq should point to it). If previous request was
 221  * unsuccessful, it is retried for predetermined number of times. Return value
 222  * of 0 means that new request was assigned to the host.
 223  */
 224 int memstick_next_req(struct memstick_host *host, struct memstick_request **mrq)
 225 {
 226         int rc = -ENXIO;
 227
 228         if ((*mrq) && (*mrq)->error && host->retries) {
 229                 (*mrq)->error = rc;
 230                 host->retries--;
 231                 return 0;
 232         }
 233
 234         if (host->card && host->card->next_request)
 235                 rc = host->card->next_request(host->card, mrq);
 236
 237         if (!rc)
 238                 host->retries = cmd_retries > 1 ? cmd_retries - 1 : 1;
 239         else
 240                 *mrq = NULL;
 241
 242         return rc;
 243 }
 244 EXPORT_SYMBOL(memstick_next_req);
 245
 246 /**
 247  * memstick_new_req - notify the host that some requests are pending
 248  * @host - host to use
 249  */
 250 void memstick_new_req(struct memstick_host *host)
 251 {
 252         host->retries = cmd_retries;
 253         host->request(host);
 254 }
 255 EXPORT_SYMBOL(memstick_new_req);
 256
 257 /**
 258  * memstick_init_req_sg - set request fields needed for bulk data transfer
 259  * @mrq - request to use
 260  * @tpc - memstick Transport Protocol Command
 261  * @sg - TPC argument
 262  */
 263 void memstick_init_req_sg(struct memstick_request *mrq, unsigned char tpc,
 264                           struct scatterlist *sg)
 265 {
 266         mrq->tpc = tpc;
 267         if (tpc & 8)
 268                 mrq->data_dir = WRITE;
 269         else
 270                 mrq->data_dir = READ;
 271
 272         mrq->sg = *sg;
 273         mrq->long_data = 1;
 274
 275         if (tpc == MS_TPC_SET_CMD || tpc == MS_TPC_EX_SET_CMD)
 276                 mrq->need_card_int = 1;
 277         else
 278                 mrq->need_card_int = 0;
 279 }
 280 EXPORT_SYMBOL(memstick_init_req_sg);
 281
 282 /**
 283  * memstick_init_req - set request fields needed for short data transfer
 284  * @mrq - request to use
 285  * @tpc - memstick Transport Protocol Command
 286  * @buf - TPC argument buffer
 287  * @length - TPC argument size
 288  *
 289  * The intended use of this function (transfer of data items several bytes
 290  * in size) allows us to just copy the value between request structure and
 291  * user supplied buffer.
 292  */
 293 void memstick_init_req(struct memstick_request *mrq, unsigned char tpc,
 294                        void *buf, size_t length)
 295 {
 296         mrq->tpc = tpc;
 297         if (tpc & 8)
 298                 mrq->data_dir = WRITE;
 299         else
 300                 mrq->data_dir = READ;
 301
 302         mrq->data_len = length > sizeof(mrq->data) ? sizeof(mrq->data) : length;
 303         if (mrq->data_dir == WRITE)
 304                 memcpy(mrq->data, buf, mrq->data_len);
 305
 306         mrq->long_data = 0;
 307
 308         if (tpc == MS_TPC_SET_CMD || tpc == MS_TPC_EX_SET_CMD)
 309                 mrq->need_card_int = 1;
 310         else
 311                 mrq->need_card_int = 0;
 312 }
 313 EXPORT_SYMBOL(memstick_init_req);
 314
 315 /*
 316  * Functions prefixed with "h_" are protocol callbacks. They can be called from
 317  * interrupt context. Return value of 0 means that request processing is still
 318  * ongoing, while special error value of -EAGAIN means that current request is
 319  * finished (and request processor should come back some time later).
 320  */
 321
 322 static int h_memstick_read_dev_id(struct memstick_dev *card,
 323                                   struct memstick_request **mrq)
 324 {
 325         struct ms_id_register id_reg;
 326
 327         if (!(*mrq)) {
 328                 memstick_init_req(&card->current_mrq, MS_TPC_READ_REG, NULL,
 329                                   sizeof(struct ms_id_register));
 330                 *mrq = &card->current_mrq;
 331                 return 0;
 332         } else {
 333                 if (!(*mrq)->error) {
 334                         memcpy(&id_reg, (*mrq)->data, sizeof(id_reg));
 335                         card->id.match_flags = MEMSTICK_MATCH_ALL;
 336                         card->id.type = id_reg.type;
 337                         card->id.category = id_reg.category;
 338                         card->id.class = id_reg.class;
 339                 }
 340                 complete(&card->mrq_complete);
 341                 dev_dbg(&card->dev, "if_mode = %02x\n", id_reg.if_mode);
 342                 return -EAGAIN;
 343         }
 344 }
 345
 346 static int h_memstick_set_rw_addr(struct memstick_dev *card,
 347                                   struct memstick_request **mrq)
 348 {
 349         if (!(*mrq)) {
 350                 memstick_init_req(&card->current_mrq, MS_TPC_SET_RW_REG_ADRS,
 351                                   (char *)&card->reg_addr,
 352                                   sizeof(card->reg_addr));
 353                 *mrq = &card->current_mrq;
 354                 return 0;
 355         } else {
 356                 complete(&card->mrq_complete);
 357                 return -EAGAIN;
 358         }
 359 }
 360
 361 /**
 362  * memstick_set_rw_addr - issue SET_RW_REG_ADDR request and wait for it to
 363  *                        complete
 364  * @card - media device to use
 365  */
 366 int memstick_set_rw_addr(struct memstick_dev *card)
 367 {
 368         card->next_request = h_memstick_set_rw_addr;
 369         memstick_new_req(card->host);
 370         wait_for_completion(&card->mrq_complete);
 371
 372         return card->current_mrq.error;
 373 }
 374 EXPORT_SYMBOL(memstick_set_rw_addr);
 375
 376 static struct memstick_dev *memstick_alloc_card(struct memstick_host *host)
 377 {
 378         struct memstick_dev *card = kzalloc(sizeof(struct memstick_dev),
 379                                             GFP_KERNEL);
 380         struct memstick_dev *old_card = host->card;
 381         struct ms_id_register id_reg;
 382
 383         if (card) {
 384                 card->host = host;
 385                 snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 386                          "%s", host->cdev.class_id);
 387                 card->dev.parent = host->cdev.dev;
 388                 card->dev.bus = &memstick_bus_type;
 389                 card->dev.release = memstick_free_card;
 390                 card->check = memstick_dummy_check;
 391
 392                 card->reg_addr.r_offset = offsetof(struct ms_register, id);
 393                 card->reg_addr.r_length = sizeof(id_reg);
 394                 card->reg_addr.w_offset = offsetof(struct ms_register, id);
 395                 card->reg_addr.w_length = sizeof(id_reg);
 396
 397                 init_completion(&card->mrq_complete);
 398
 399                 host->card = card;
 400                 if (memstick_set_rw_addr(card))
 401                         goto err_out;
 402
 403                 card->next_request = h_memstick_read_dev_id;
 404                 memstick_new_req(host);
 405                 wait_for_completion(&card->mrq_complete);
 406
 407                 if (card->current_mrq.error)
 408                         goto err_out;
 409         }
 410         host->card = old_card;
 411         return card;
 412 err_out:
 413         host->card = old_card;
 414         kfree(card);
 415         return NULL;
 416 }
 417
 418 static void memstick_power_on(struct memstick_host *host)
 419 {
 420         host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_ON);
 421         host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_SERIAL);
 422 }
 423
 424 static void memstick_check(struct work_struct *work)
 425 {
 426         struct memstick_host *host = container_of(work, struct memstick_host,
 427                                                   media_checker);
 428         struct memstick_dev *card;
 429
 430         dev_dbg(host->cdev.dev, "memstick_check started\n");
 431         mutex_lock(&host->lock);
 432         if (!host->card)
 433                 memstick_power_on(host);
 434
 435         card = memstick_alloc_card(host);
 436
 437         if (!card) {
 438                 if (host->card) {
 439                         device_unregister(&host->card->dev);
 440                         host->card = NULL;
 441                 }
 442         } else {
 443                 dev_dbg(host->cdev.dev, "new card %02x, %02x, %02x\n",
 444                         card->id.type, card->id.category, card->id.class);
 445                 if (host->card) {
 446                         if (memstick_set_rw_addr(host->card)
 447                             || !memstick_dev_match(host->card, &card->id)
 448                             || !(host->card->check(host->card))) {
 449                                 device_unregister(&host->card->dev);
 450                                 host->card = NULL;
 451                         }
 452                 }
 453
 454                 if (!host->card) {
 455                         host->card = card;
 456                         if (device_register(&card->dev)) {
 457                                 kfree(host->card);
 458                                 host->card = NULL;
 459                         }
 460                 } else
 461                         kfree(card);
 462         }
 463
 464         if (!host->card)
 465                 host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
 466
 467         mutex_unlock(&host->lock);
 468         dev_dbg(host->cdev.dev, "memstick_check finished\n");
 469 }
 470
 471 /**
 472  * memstick_alloc_host - allocate a memstick_host structure
 473  * @extra: size of the user private data to allocate
 474  * @dev: parent device of the host
 475  */
 476 struct memstick_host *memstick_alloc_host(unsigned int extra,
 477                                           struct device *dev)
 478 {
 479         struct memstick_host *host;
 480
 481         host = kzalloc(sizeof(struct memstick_host) + extra, GFP_KERNEL);
 482         if (host) {
 483                 mutex_init(&host->lock);
 484                 INIT_WORK(&host->media_checker, memstick_check);
 485                 host->cdev.class = &memstick_host_class;
 486                 host->cdev.dev = dev;
 487                 class_device_initialize(&host->cdev);
 488         }
 489         return host;
 490 }
 491 EXPORT_SYMBOL(memstick_alloc_host);
 492
 493 /**
 494  * memstick_add_host - start request processing on memstick host
 495  * @host - host to use
 496  */
 497 int memstick_add_host(struct memstick_host *host)
 498 {
 499         int rc;
 500
 501         if (!idr_pre_get(&memstick_host_idr, GFP_KERNEL))
 502                 return -ENOMEM;
 503
 504         spin_lock(&memstick_host_lock);
 505         rc = idr_get_new(&memstick_host_idr, host, &host->id);
 506         spin_unlock(&memstick_host_lock);
 507         if (rc)
 508                 return rc;
 509
 510         snprintf(host->cdev.class_id, BUS_ID_SIZE,
 511                  "memstick%u", host->id);
 512
 513         rc = class_device_add(&host->cdev);
 514         if (rc) {
 515                 spin_lock(&memstick_host_lock);
 516                 idr_remove(&memstick_host_idr, host->id);
 517                 spin_unlock(&memstick_host_lock);
 518                 return rc;
 519         }
 520
 521         host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
 522         memstick_detect_change(host);
 523         return 0;
 524 }
 525 EXPORT_SYMBOL(memstick_add_host);
 526
 527 /**
 528  * memstick_remove_host - stop request processing on memstick host
 529  * @host - host to use
 530  */
 531 void memstick_remove_host(struct memstick_host *host)
 532 {
 533         flush_workqueue(workqueue);
 534         mutex_lock(&host->lock);
 535         if (host->card)
 536                 device_unregister(&host->card->dev);
 537         host->card = NULL;
 538         host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
 539         mutex_unlock(&host->lock);
 540
 541         spin_lock(&memstick_host_lock);
 542         idr_remove(&memstick_host_idr, host->id);
 543         spin_unlock(&memstick_host_lock);
 544         class_device_del(&host->cdev);
 545 }
 546 EXPORT_SYMBOL(memstick_remove_host);
 547
 548 /**
 549  * memstick_free_host - free memstick host
 550  * @host - host to use
 551  */
 552 void memstick_free_host(struct memstick_host *host)
 553 {
 554         mutex_destroy(&host->lock);
 555         class_device_put(&host->cdev);
 556 }
 557 EXPORT_SYMBOL(memstick_free_host);
 558
 559 /**
 560  * memstick_suspend_host - notify bus driver of host suspension
 561  * @host - host to use
 562  */
 563 void memstick_suspend_host(struct memstick_host *host)
 564 {
 565         mutex_lock(&host->lock);
 566         host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
 567         mutex_unlock(&host->lock);
 568 }
 569 EXPORT_SYMBOL(memstick_suspend_host);
 570
 571 /**
 572  * memstick_resume_host - notify bus driver of host resumption
 573  * @host - host to use
 574  */
 575 void memstick_resume_host(struct memstick_host *host)
 576 {
 577         mutex_lock(&host->lock);
 578         if (host->card)
 579                 memstick_power_on(host);
 580         mutex_unlock(&host->lock);
 581         memstick_detect_change(host);
 582 }
 583 EXPORT_SYMBOL(memstick_resume_host);
 584
 585 int memstick_register_driver(struct memstick_driver *drv)
 586 {
 587         drv->driver.bus = &memstick_bus_type;
 588
 589         return driver_register(&drv->driver);
 590 }
 591 EXPORT_SYMBOL(memstick_register_driver);
 592
 593 void memstick_unregister_driver(struct memstick_driver *drv)
 594 {
 595         driver_unregister(&drv->driver);
 596 }
 597 EXPORT_SYMBOL(memstick_unregister_driver);
 598
 599
 600 static int __init memstick_init(void)
 601 {
 602         int rc;
 603
 604         workqueue = create_freezeable_workqueue("kmemstick");
 605         if (!workqueue)
 606                 return -ENOMEM;
 607
 608         rc = bus_register(&memstick_bus_type);
 609         if (!rc)
 610                 rc = class_register(&memstick_host_class);
 611
 612         if (!rc)
 613                 return 0;
 614
 615         bus_unregister(&memstick_bus_type);
 616         destroy_workqueue(workqueue);
 617
 618         return rc;
 619 }
 620
 621 static void __exit memstick_exit(void)
 622 {
 623         class_unregister(&memstick_host_class);
 624         bus_unregister(&memstick_bus_type);
 625         destroy_workqueue(workqueue);
 626         idr_destroy(&memstick_host_idr);
 627 }
 628
 629 module_init(memstick_init);
 630 module_exit(memstick_exit);
 631
 632 MODULE_AUTHOR("Alex Dubov");
 633 MODULE_LICENSE("GPL");
 634 MODULE_DESCRIPTION("Sony MemoryStick core driver");