drivers/mmc/core/bus.c

   1 /*
   2  *  linux/drivers/mmc/core/bus.c
   3  *
   4  *  Copyright (C) 2003 Russell King, All Rights Reserved.
   5  *  Copyright (C) 2007 Pierre Ossman
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  *  MMC card bus driver model
  12  */
  13
  14 #include <linux/export.h>
  15 #include <linux/device.h>
  16 #include <linux/err.h>
  17 #include <linux/slab.h>
  18 #include <linux/stat.h>
  19 #include <linux/pm_runtime.h>
  20
  21 #include <linux/mmc/card.h>
  22 #include <linux/mmc/host.h>
  23
  24 #include "core.h"
  25 #include "sdio_cis.h"
  26 #include "bus.h"
  27
  28 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
  29
  30 static ssize_t mmc_type_show(struct device *dev,
  31         struct device_attribute *attr, char *buf)
  32 {
  33         struct mmc_card *card = mmc_dev_to_card(dev);
  34
  35         switch (card->type) {
  36         case MMC_TYPE_MMC:
  37                 return sprintf(buf, "MMC\n");
  38         case MMC_TYPE_SD:
  39                 return sprintf(buf, "SD\n");
  40         case MMC_TYPE_SDIO:
  41                 return sprintf(buf, "SDIO\n");
  42         case MMC_TYPE_SD_COMBO:
  43                 return sprintf(buf, "SDcombo\n");
  44         default:
  45                 return -EFAULT;
  46         }
  47 }
  48
  49 static struct device_attribute mmc_dev_attrs[] = {
  50         __ATTR(type, S_IRUGO, mmc_type_show, NULL),
  51         __ATTR_NULL,
  52 };
  53
  54 /*
  55  * This currently matches any MMC driver to any MMC card - drivers
  56  * themselves make the decision whether to drive this card in their
  57  * probe method.
  58  */
  59 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  60 {
  61         return 1;
  62 }
  63
  64 static int
  65 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
  66 {
  67         struct mmc_card *card = mmc_dev_to_card(dev);
  68         const char *type;
  69         int retval = 0;
  70
  71         switch (card->type) {
  72         case MMC_TYPE_MMC:
  73                 type = "MMC";
  74                 break;
  75         case MMC_TYPE_SD:
  76                 type = "SD";
  77                 break;
  78         case MMC_TYPE_SDIO:
  79                 type = "SDIO";
  80                 break;
  81         case MMC_TYPE_SD_COMBO:
  82                 type = "SDcombo";
  83                 break;
  84         default:
  85                 type = NULL;
  86         }
  87
  88         if (type) {
  89                 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
  90                 if (retval)
  91                         return retval;
  92         }
  93
  94         retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
  95         if (retval)
  96                 return retval;
  97
  98         /*
  99          * Request the mmc_block device.  Note: that this is a direct request
 100          * for the module it carries no information as to what is inserted.
 101          */
 102         retval = add_uevent_var(env, "MODALIAS=mmc:block");
 103
 104         return retval;
 105 }
 106
 107 static int mmc_bus_probe(struct device *dev)
 108 {
 109         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 110         struct mmc_card *card = mmc_dev_to_card(dev);
 111
 112         return drv->probe(card);
 113 }
 114
 115 static int mmc_bus_remove(struct device *dev)
 116 {
 117         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 118         struct mmc_card *card = mmc_dev_to_card(dev);
 119
 120         drv->remove(card);
 121
 122         return 0;
 123 }
 124
 125 static void mmc_bus_shutdown(struct device *dev)
 126 {
 127         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 128         struct mmc_card *card = mmc_dev_to_card(dev);
 129         struct mmc_host *host = card->host;
 130         int ret;
 131
 132         if (dev->driver && drv->shutdown)
 133                 drv->shutdown(card);
 134
 135         if (host->bus_ops->shutdown) {
 136                 ret = host->bus_ops->shutdown(host);
 137                 if (ret)
 138                         pr_warn("%s: error %d during shutdown\n",
 139                                 mmc_hostname(host), ret);
 140         }
 141 }
 142
 143 #ifdef CONFIG_PM_SLEEP
 144 static int mmc_bus_suspend(struct device *dev)
 145 {
 146         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 147         struct mmc_card *card = mmc_dev_to_card(dev);
 148         struct mmc_host *host = card->host;
 149         int ret;
 150
 151         if (dev->driver && drv->suspend) {
 152                 ret = drv->suspend(card);
 153                 if (ret)
 154                         return ret;
 155         }
 156
 157         ret = host->bus_ops->suspend(host);
 158         return ret;
 159 }
 160
 161 static int mmc_bus_resume(struct device *dev)
 162 {
 163         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 164         struct mmc_card *card = mmc_dev_to_card(dev);
 165         struct mmc_host *host = card->host;
 166         int ret;
 167
 168         ret = host->bus_ops->resume(host);
 169         if (ret)
 170                 pr_warn("%s: error %d during resume (card was removed?)\n",
 171                         mmc_hostname(host), ret);
 172
 173         if (dev->driver && drv->resume)
 174                 ret = drv->resume(card);
 175
 176         return ret;
 177 }
 178 #endif
 179
 180 #ifdef CONFIG_PM_RUNTIME
 181
 182 static int mmc_runtime_suspend(struct device *dev)
 183 {
 184         struct mmc_card *card = mmc_dev_to_card(dev);
 185         struct mmc_host *host = card->host;
 186         int ret = 0;
 187
 188         if (host->bus_ops->runtime_suspend)
 189                 ret = host->bus_ops->runtime_suspend(host);
 190
 191         return ret;
 192 }
 193
 194 static int mmc_runtime_resume(struct device *dev)
 195 {
 196         struct mmc_card *card = mmc_dev_to_card(dev);
 197         struct mmc_host *host = card->host;
 198         int ret = 0;
 199
 200         if (host->bus_ops->runtime_resume)
 201                 ret = host->bus_ops->runtime_resume(host);
 202
 203         return ret;
 204 }
 205
 206 static int mmc_runtime_idle(struct device *dev)
 207 {
 208         return 0;
 209 }
 210
 211 #endif /* !CONFIG_PM_RUNTIME */
 212
 213 static const struct dev_pm_ops mmc_bus_pm_ops = {
 214         SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume,
 215                         mmc_runtime_idle)
 216         SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
 217 };
 218
 219 static struct bus_type mmc_bus_type = {
 220         .name           = "mmc",
 221         .dev_attrs      = mmc_dev_attrs,
 222         .match          = mmc_bus_match,
 223         .uevent         = mmc_bus_uevent,
 224         .probe          = mmc_bus_probe,
 225         .remove         = mmc_bus_remove,
 226         .shutdown       = mmc_bus_shutdown,
 227         .pm             = &mmc_bus_pm_ops,
 228 };
 229
 230 int mmc_register_bus(void)
 231 {
 232         return bus_register(&mmc_bus_type);
 233 }
 234
 235 void mmc_unregister_bus(void)
 236 {
 237         bus_unregister(&mmc_bus_type);
 238 }
 239
 240 /**
 241  *      mmc_register_driver - register a media driver
 242  *      @drv: MMC media driver
 243  */
 244 int mmc_register_driver(struct mmc_driver *drv)
 245 {
 246         drv->drv.bus = &mmc_bus_type;
 247         return driver_register(&drv->drv);
 248 }
 249
 250 EXPORT_SYMBOL(mmc_register_driver);
 251
 252 /**
 253  *      mmc_unregister_driver - unregister a media driver
 254  *      @drv: MMC media driver
 255  */
 256 void mmc_unregister_driver(struct mmc_driver *drv)
 257 {
 258         drv->drv.bus = &mmc_bus_type;
 259         driver_unregister(&drv->drv);
 260 }
 261
 262 EXPORT_SYMBOL(mmc_unregister_driver);
 263
 264 static void mmc_release_card(struct device *dev)
 265 {
 266         struct mmc_card *card = mmc_dev_to_card(dev);
 267
 268         sdio_free_common_cis(card);
 269
 270         kfree(card->info);
 271
 272         kfree(card);
 273 }
 274
 275 /*
 276  * Allocate and initialise a new MMC card structure.
 277  */
 278 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 279 {
 280         struct mmc_card *card;
 281
 282         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 283         if (!card)
 284                 return ERR_PTR(-ENOMEM);
 285
 286         card->host = host;
 287
 288         device_initialize(&card->dev);
 289
 290         card->dev.parent = mmc_classdev(host);
 291         card->dev.bus = &mmc_bus_type;
 292         card->dev.release = mmc_release_card;
 293         card->dev.type = type;
 294
 295         return card;
 296 }
 297
 298 /*
 299  * Register a new MMC card with the driver model.
 300  */
 301 int mmc_add_card(struct mmc_card *card)
 302 {
 303         int ret;
 304         const char *type;
 305         const char *uhs_bus_speed_mode = "";
 306         static const char *const uhs_speeds[] = {
 307                 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
 308                 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
 309                 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
 310                 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
 311                 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
 312         };
 313
 314
 315         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 316
 317         switch (card->type) {
 318         case MMC_TYPE_MMC:
 319                 type = "MMC";
 320                 break;
 321         case MMC_TYPE_SD:
 322                 type = "SD";
 323                 if (mmc_card_blockaddr(card)) {
 324                         if (mmc_card_ext_capacity(card))
 325                                 type = "SDXC";
 326                         else
 327                                 type = "SDHC";
 328                 }
 329                 break;
 330         case MMC_TYPE_SDIO:
 331                 type = "SDIO";
 332                 break;
 333         case MMC_TYPE_SD_COMBO:
 334                 type = "SD-combo";
 335                 if (mmc_card_blockaddr(card))
 336                         type = "SDHC-combo";
 337                 break;
 338         default:
 339                 type = "?";
 340                 break;
 341         }
 342
 343         if (mmc_sd_card_uhs(card) &&
 344                 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
 345                 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
 346
 347         if (mmc_host_is_spi(card->host)) {
 348                 pr_info("%s: new %s%s%s card on SPI\n",
 349                         mmc_hostname(card->host),
 350                         mmc_card_highspeed(card) ? "high speed " : "",
 351                         mmc_card_ddr_mode(card) ? "DDR " : "",
 352                         type);
 353         } else {
 354                 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
 355                         mmc_hostname(card->host),
 356                         mmc_card_uhs(card) ? "ultra high speed " :
 357                         (mmc_card_highspeed(card) ? "high speed " : ""),
 358                         (mmc_card_hs200(card) ? "HS200 " : ""),
 359                         mmc_card_ddr_mode(card) ? "DDR " : "",
 360                         uhs_bus_speed_mode, type, card->rca);
 361         }
 362
 363 #ifdef CONFIG_DEBUG_FS
 364         mmc_add_card_debugfs(card);
 365 #endif
 366         mmc_init_context_info(card->host);
 367
 368         ret = device_add(&card->dev);
 369         if (ret)
 370                 return ret;
 371
 372         mmc_card_set_present(card);
 373
 374         return 0;
 375 }
 376
 377 /*
 378  * Unregister a new MMC card with the driver model, and
 379  * (eventually) free it.
 380  */
 381 void mmc_remove_card(struct mmc_card *card)
 382 {
 383 #ifdef CONFIG_DEBUG_FS
 384         mmc_remove_card_debugfs(card);
 385 #endif
 386
 387         if (mmc_card_present(card)) {
 388                 if (mmc_host_is_spi(card->host)) {
 389                         pr_info("%s: SPI card removed\n",
 390                                 mmc_hostname(card->host));
 391                 } else {
 392                         pr_info("%s: card %04x removed\n",
 393                                 mmc_hostname(card->host), card->rca);
 394                 }
 395                 device_del(&card->dev);
 396         }
 397
 398         put_device(&card->dev);
 399 }
 400