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 static ssize_t type_show(struct device *dev,
  29         struct device_attribute *attr, char *buf)
  30 {
  31         struct mmc_card *card = mmc_dev_to_card(dev);
  32
  33         switch (card->type) {
  34         case MMC_TYPE_MMC:
  35                 return sprintf(buf, "MMC\n");
  36         case MMC_TYPE_SD:
  37                 return sprintf(buf, "SD\n");
  38         case MMC_TYPE_SDIO:
  39                 return sprintf(buf, "SDIO\n");
  40         case MMC_TYPE_SD_COMBO:
  41                 return sprintf(buf, "SDcombo\n");
  42         default:
  43                 return -EFAULT;
  44         }
  45 }
  46 static DEVICE_ATTR_RO(type);
  47
  48 static struct attribute *mmc_dev_attrs[] = {
  49         &dev_attr_type.attr,
  50         NULL,
  51 };
  52 ATTRIBUTE_GROUPS(mmc_dev);
  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 void mmc_bus_shutdown(struct device *dev)
 108 {
 109         struct mmc_card *card = mmc_dev_to_card(dev);
 110         struct mmc_host *host = card->host;
 111         int ret;
 112
 113         if (dev->driver && dev->driver->shutdown)
 114                 dev->driver->shutdown(dev);
 115
 116         if (host->bus_ops->shutdown) {
 117                 ret = host->bus_ops->shutdown(host);
 118                 if (ret)
 119                         pr_warn("%s: error %d during shutdown\n",
 120                                 mmc_hostname(host), ret);
 121         }
 122 }
 123
 124 #ifdef CONFIG_PM_SLEEP
 125 static int mmc_bus_suspend(struct device *dev)
 126 {
 127         struct mmc_card *card = mmc_dev_to_card(dev);
 128         struct mmc_host *host = card->host;
 129         int ret;
 130
 131         ret = pm_generic_suspend(dev);
 132         if (ret)
 133                 return ret;
 134
 135         ret = host->bus_ops->suspend(host);
 136         return ret;
 137 }
 138
 139 static int mmc_bus_resume(struct device *dev)
 140 {
 141         struct mmc_card *card = mmc_dev_to_card(dev);
 142         struct mmc_host *host = card->host;
 143         int ret;
 144
 145         ret = host->bus_ops->resume(host);
 146         if (ret)
 147                 pr_warn("%s: error %d during resume (card was removed?)\n",
 148                         mmc_hostname(host), ret);
 149
 150         ret = pm_generic_resume(dev);
 151         return ret;
 152 }
 153 #endif
 154
 155 #ifdef CONFIG_PM
 156 static int mmc_runtime_suspend(struct device *dev)
 157 {
 158         struct mmc_card *card = mmc_dev_to_card(dev);
 159         struct mmc_host *host = card->host;
 160
 161         return host->bus_ops->runtime_suspend(host);
 162 }
 163
 164 static int mmc_runtime_resume(struct device *dev)
 165 {
 166         struct mmc_card *card = mmc_dev_to_card(dev);
 167         struct mmc_host *host = card->host;
 168
 169         return host->bus_ops->runtime_resume(host);
 170 }
 171 #endif /* !CONFIG_PM */
 172
 173 static const struct dev_pm_ops mmc_bus_pm_ops = {
 174         SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
 175         SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
 176 };
 177
 178 static struct bus_type mmc_bus_type = {
 179         .name           = "mmc",
 180         .dev_groups     = mmc_dev_groups,
 181         .match          = mmc_bus_match,
 182         .uevent         = mmc_bus_uevent,
 183         .shutdown       = mmc_bus_shutdown,
 184         .pm             = &mmc_bus_pm_ops,
 185 };
 186
 187 int mmc_register_bus(void)
 188 {
 189         return bus_register(&mmc_bus_type);
 190 }
 191
 192 void mmc_unregister_bus(void)
 193 {
 194         bus_unregister(&mmc_bus_type);
 195 }
 196
 197 /**
 198  *      mmc_register_driver - register a media driver
 199  *      @drv: MMC media driver
 200  */
 201 int mmc_register_driver(struct device_driver *drv)
 202 {
 203         drv->bus = &mmc_bus_type;
 204         return driver_register(drv);
 205 }
 206 EXPORT_SYMBOL(mmc_register_driver);
 207
 208 /**
 209  *      mmc_unregister_driver - unregister a media driver
 210  *      @drv: MMC media driver
 211  */
 212 void mmc_unregister_driver(struct device_driver *drv)
 213 {
 214         drv->bus = &mmc_bus_type;
 215         driver_unregister(drv);
 216 }
 217 EXPORT_SYMBOL(mmc_unregister_driver);
 218
 219 static void mmc_release_card(struct device *dev)
 220 {
 221         struct mmc_card *card = mmc_dev_to_card(dev);
 222
 223         sdio_free_common_cis(card);
 224
 225         kfree(card->info);
 226
 227         kfree(card);
 228 }
 229
 230 /*
 231  * Allocate and initialise a new MMC card structure.
 232  */
 233 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 234 {
 235         struct mmc_card *card;
 236
 237         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 238         if (!card)
 239                 return ERR_PTR(-ENOMEM);
 240
 241         card->host = host;
 242
 243         device_initialize(&card->dev);
 244
 245         card->dev.parent = mmc_classdev(host);
 246         card->dev.bus = &mmc_bus_type;
 247         card->dev.release = mmc_release_card;
 248         card->dev.type = type;
 249
 250         return card;
 251 }
 252
 253 /*
 254  * Register a new MMC card with the driver model.
 255  */
 256 int mmc_add_card(struct mmc_card *card)
 257 {
 258         int ret;
 259         const char *type;
 260         const char *uhs_bus_speed_mode = "";
 261         static const char *const uhs_speeds[] = {
 262                 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
 263                 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
 264                 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
 265                 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
 266                 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
 267         };
 268
 269
 270         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 271
 272         switch (card->type) {
 273         case MMC_TYPE_MMC:
 274                 type = "MMC";
 275                 break;
 276         case MMC_TYPE_SD:
 277                 type = "SD";
 278                 if (mmc_card_blockaddr(card)) {
 279                         if (mmc_card_ext_capacity(card))
 280                                 type = "SDXC";
 281                         else
 282                                 type = "SDHC";
 283                 }
 284                 break;
 285         case MMC_TYPE_SDIO:
 286                 type = "SDIO";
 287                 break;
 288         case MMC_TYPE_SD_COMBO:
 289                 type = "SD-combo";
 290                 if (mmc_card_blockaddr(card))
 291                         type = "SDHC-combo";
 292                 break;
 293         default:
 294                 type = "?";
 295                 break;
 296         }
 297
 298         if (mmc_card_uhs(card) &&
 299                 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
 300                 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
 301
 302         if (mmc_host_is_spi(card->host)) {
 303                 pr_info("%s: new %s%s%s card on SPI\n",
 304                         mmc_hostname(card->host),
 305                         mmc_card_hs(card) ? "high speed " : "",
 306                         mmc_card_ddr52(card) ? "DDR " : "",
 307                         type);
 308         } else {
 309                 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
 310                         mmc_hostname(card->host),
 311                         mmc_card_uhs(card) ? "ultra high speed " :
 312                         (mmc_card_hs(card) ? "high speed " : ""),
 313                         mmc_card_hs400(card) ? "HS400 " :
 314                         (mmc_card_hs200(card) ? "HS200 " : ""),
 315                         mmc_card_ddr52(card) ? "DDR " : "",
 316                         uhs_bus_speed_mode, type, card->rca);
 317         }
 318
 319 #ifdef CONFIG_DEBUG_FS
 320         mmc_add_card_debugfs(card);
 321 #endif
 322         mmc_init_context_info(card->host);
 323
 324         ret = device_add(&card->dev);
 325         if (ret)
 326                 return ret;
 327
 328         mmc_card_set_present(card);
 329
 330         return 0;
 331 }
 332
 333 /*
 334  * Unregister a new MMC card with the driver model, and
 335  * (eventually) free it.
 336  */
 337 void mmc_remove_card(struct mmc_card *card)
 338 {
 339 #ifdef CONFIG_DEBUG_FS
 340         mmc_remove_card_debugfs(card);
 341 #endif
 342
 343         if (mmc_card_present(card)) {
 344                 if (mmc_host_is_spi(card->host)) {
 345                         pr_info("%s: SPI card removed\n",
 346                                 mmc_hostname(card->host));
 347                 } else {
 348                         pr_info("%s: card %04x removed\n",
 349                                 mmc_hostname(card->host), card->rca);
 350                 }
 351                 device_del(&card->dev);
 352         }
 353
 354         put_device(&card->dev);
 355 }
 356