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 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 static DEVICE_ATTR_RO(type);
  49
  50 static struct attribute *mmc_dev_attrs[] = {
  51         &dev_attr_type.attr,
  52         NULL,
  53 };
  54 ATTRIBUTE_GROUPS(mmc_dev);
  55
  56 /*
  57  * This currently matches any MMC driver to any MMC card - drivers
  58  * themselves make the decision whether to drive this card in their
  59  * probe method.
  60  */
  61 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  62 {
  63         return 1;
  64 }
  65
  66 static int
  67 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
  68 {
  69         struct mmc_card *card = mmc_dev_to_card(dev);
  70         const char *type;
  71         int retval = 0;
  72
  73         switch (card->type) {
  74         case MMC_TYPE_MMC:
  75                 type = "MMC";
  76                 break;
  77         case MMC_TYPE_SD:
  78                 type = "SD";
  79                 break;
  80         case MMC_TYPE_SDIO:
  81                 type = "SDIO";
  82                 break;
  83         case MMC_TYPE_SD_COMBO:
  84                 type = "SDcombo";
  85                 break;
  86         default:
  87                 type = NULL;
  88         }
  89
  90         if (type) {
  91                 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
  92                 if (retval)
  93                         return retval;
  94         }
  95
  96         retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
  97         if (retval)
  98                 return retval;
  99
 100         /*
 101          * Request the mmc_block device.  Note: that this is a direct request
 102          * for the module it carries no information as to what is inserted.
 103          */
 104         retval = add_uevent_var(env, "MODALIAS=mmc:block");
 105
 106         return retval;
 107 }
 108
 109 static int mmc_bus_probe(struct device *dev)
 110 {
 111         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 112         struct mmc_card *card = mmc_dev_to_card(dev);
 113
 114         return drv->probe(card);
 115 }
 116
 117 static int mmc_bus_remove(struct device *dev)
 118 {
 119         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 120         struct mmc_card *card = mmc_dev_to_card(dev);
 121
 122         drv->remove(card);
 123
 124         return 0;
 125 }
 126
 127 static void mmc_bus_shutdown(struct device *dev)
 128 {
 129         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 130         struct mmc_card *card = mmc_dev_to_card(dev);
 131         struct mmc_host *host = card->host;
 132         int ret;
 133
 134         if (dev->driver && drv->shutdown)
 135                 drv->shutdown(card);
 136
 137         if (host->bus_ops->shutdown) {
 138                 ret = host->bus_ops->shutdown(host);
 139                 if (ret)
 140                         pr_warn("%s: error %d during shutdown\n",
 141                                 mmc_hostname(host), ret);
 142         }
 143 }
 144
 145 #ifdef CONFIG_PM_SLEEP
 146 static int mmc_bus_suspend(struct device *dev)
 147 {
 148         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 149         struct mmc_card *card = mmc_dev_to_card(dev);
 150         struct mmc_host *host = card->host;
 151         int ret;
 152
 153         if (dev->driver && drv->suspend) {
 154                 ret = drv->suspend(card);
 155                 if (ret)
 156                         return ret;
 157         }
 158
 159         ret = host->bus_ops->suspend(host);
 160         return ret;
 161 }
 162
 163 static int mmc_bus_resume(struct device *dev)
 164 {
 165         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 166         struct mmc_card *card = mmc_dev_to_card(dev);
 167         struct mmc_host *host = card->host;
 168         int ret;
 169
 170         ret = host->bus_ops->resume(host);
 171         if (ret)
 172                 pr_warn("%s: error %d during resume (card was removed?)\n",
 173                         mmc_hostname(host), ret);
 174
 175         if (dev->driver && drv->resume)
 176                 ret = drv->resume(card);
 177
 178         return ret;
 179 }
 180 #endif
 181
 182 #ifdef CONFIG_PM
 183 static int mmc_runtime_suspend(struct device *dev)
 184 {
 185         struct mmc_card *card = mmc_dev_to_card(dev);
 186         struct mmc_host *host = card->host;
 187
 188         return host->bus_ops->runtime_suspend(host);
 189 }
 190
 191 static int mmc_runtime_resume(struct device *dev)
 192 {
 193         struct mmc_card *card = mmc_dev_to_card(dev);
 194         struct mmc_host *host = card->host;
 195
 196         return host->bus_ops->runtime_resume(host);
 197 }
 198 #endif /* !CONFIG_PM */
 199
 200 static const struct dev_pm_ops mmc_bus_pm_ops = {
 201         SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
 202         SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
 203 };
 204
 205 static struct bus_type mmc_bus_type = {
 206         .name           = "mmc",
 207         .dev_groups     = mmc_dev_groups,
 208         .match          = mmc_bus_match,
 209         .uevent         = mmc_bus_uevent,
 210         .probe          = mmc_bus_probe,
 211         .remove         = mmc_bus_remove,
 212         .shutdown       = mmc_bus_shutdown,
 213         .pm             = &mmc_bus_pm_ops,
 214 };
 215
 216 int mmc_register_bus(void)
 217 {
 218         return bus_register(&mmc_bus_type);
 219 }
 220
 221 void mmc_unregister_bus(void)
 222 {
 223         bus_unregister(&mmc_bus_type);
 224 }
 225
 226 /**
 227  *      mmc_register_driver - register a media driver
 228  *      @drv: MMC media driver
 229  */
 230 int mmc_register_driver(struct mmc_driver *drv)
 231 {
 232         drv->drv.bus = &mmc_bus_type;
 233         return driver_register(&drv->drv);
 234 }
 235
 236 EXPORT_SYMBOL(mmc_register_driver);
 237
 238 /**
 239  *      mmc_unregister_driver - unregister a media driver
 240  *      @drv: MMC media driver
 241  */
 242 void mmc_unregister_driver(struct mmc_driver *drv)
 243 {
 244         drv->drv.bus = &mmc_bus_type;
 245         driver_unregister(&drv->drv);
 246 }
 247
 248 EXPORT_SYMBOL(mmc_unregister_driver);
 249
 250 static void mmc_release_card(struct device *dev)
 251 {
 252         struct mmc_card *card = mmc_dev_to_card(dev);
 253
 254         sdio_free_common_cis(card);
 255
 256         kfree(card->info);
 257
 258         kfree(card);
 259 }
 260
 261 /*
 262  * Allocate and initialise a new MMC card structure.
 263  */
 264 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 265 {
 266         struct mmc_card *card;
 267
 268         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 269         if (!card)
 270                 return ERR_PTR(-ENOMEM);
 271
 272         card->host = host;
 273
 274         device_initialize(&card->dev);
 275
 276         card->dev.parent = mmc_classdev(host);
 277         card->dev.bus = &mmc_bus_type;
 278         card->dev.release = mmc_release_card;
 279         card->dev.type = type;
 280
 281         return card;
 282 }
 283
 284 /*
 285  * Register a new MMC card with the driver model.
 286  */
 287 int mmc_add_card(struct mmc_card *card)
 288 {
 289         int ret;
 290         const char *type;
 291         const char *uhs_bus_speed_mode = "";
 292         static const char *const uhs_speeds[] = {
 293                 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
 294                 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
 295                 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
 296                 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
 297                 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
 298         };
 299
 300
 301         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 302
 303         switch (card->type) {
 304         case MMC_TYPE_MMC:
 305                 type = "MMC";
 306                 break;
 307         case MMC_TYPE_SD:
 308                 type = "SD";
 309                 if (mmc_card_blockaddr(card)) {
 310                         if (mmc_card_ext_capacity(card))
 311                                 type = "SDXC";
 312                         else
 313                                 type = "SDHC";
 314                 }
 315                 break;
 316         case MMC_TYPE_SDIO:
 317                 type = "SDIO";
 318                 break;
 319         case MMC_TYPE_SD_COMBO:
 320                 type = "SD-combo";
 321                 if (mmc_card_blockaddr(card))
 322                         type = "SDHC-combo";
 323                 break;
 324         default:
 325                 type = "?";
 326                 break;
 327         }
 328
 329         if (mmc_card_uhs(card) &&
 330                 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
 331                 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
 332
 333         if (mmc_host_is_spi(card->host)) {
 334                 pr_info("%s: new %s%s%s card on SPI\n",
 335                         mmc_hostname(card->host),
 336                         mmc_card_hs(card) ? "high speed " : "",
 337                         mmc_card_ddr52(card) ? "DDR " : "",
 338                         type);
 339         } else {
 340                 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
 341                         mmc_hostname(card->host),
 342                         mmc_card_uhs(card) ? "ultra high speed " :
 343                         (mmc_card_hs(card) ? "high speed " : ""),
 344                         mmc_card_hs400(card) ? "HS400 " :
 345                         (mmc_card_hs200(card) ? "HS200 " : ""),
 346                         mmc_card_ddr52(card) ? "DDR " : "",
 347                         uhs_bus_speed_mode, type, card->rca);
 348         }
 349
 350 #ifdef CONFIG_DEBUG_FS
 351         mmc_add_card_debugfs(card);
 352 #endif
 353         mmc_init_context_info(card->host);
 354
 355         ret = device_add(&card->dev);
 356         if (ret)
 357                 return ret;
 358
 359         mmc_card_set_present(card);
 360
 361         return 0;
 362 }
 363
 364 /*
 365  * Unregister a new MMC card with the driver model, and
 366  * (eventually) free it.
 367  */
 368 void mmc_remove_card(struct mmc_card *card)
 369 {
 370 #ifdef CONFIG_DEBUG_FS
 371         mmc_remove_card_debugfs(card);
 372 #endif
 373
 374         if (mmc_card_present(card)) {
 375                 if (mmc_host_is_spi(card->host)) {
 376                         pr_info("%s: SPI card removed\n",
 377                                 mmc_hostname(card->host));
 378                 } else {
 379                         pr_info("%s: card %04x removed\n",
 380                                 mmc_hostname(card->host), card->rca);
 381                 }
 382                 device_del(&card->dev);
 383         }
 384
 385         put_device(&card->dev);
 386 }
 387