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 #ifdef CONFIG_PM_SLEEP
 126 static int mmc_bus_suspend(struct device *dev)
 127 {
 128         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 129         struct mmc_card *card = mmc_dev_to_card(dev);
 130         int ret = 0;
 131
 132         if (dev->driver && drv->suspend)
 133                 ret = drv->suspend(card);
 134         return ret;
 135 }
 136
 137 static int mmc_bus_resume(struct device *dev)
 138 {
 139         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 140         struct mmc_card *card = mmc_dev_to_card(dev);
 141         int ret = 0;
 142
 143         if (dev->driver && drv->resume)
 144                 ret = drv->resume(card);
 145         return ret;
 146 }
 147 #endif
 148
 149 #ifdef CONFIG_PM_RUNTIME
 150
 151 static int mmc_runtime_suspend(struct device *dev)
 152 {
 153         struct mmc_card *card = mmc_dev_to_card(dev);
 154
 155         return mmc_power_save_host(card->host);
 156 }
 157
 158 static int mmc_runtime_resume(struct device *dev)
 159 {
 160         struct mmc_card *card = mmc_dev_to_card(dev);
 161
 162         return mmc_power_restore_host(card->host);
 163 }
 164
 165 static int mmc_runtime_idle(struct device *dev)
 166 {
 167         return pm_runtime_suspend(dev);
 168 }
 169
 170 #endif /* !CONFIG_PM_RUNTIME */
 171
 172 static const struct dev_pm_ops mmc_bus_pm_ops = {
 173         SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume,
 174                         mmc_runtime_idle)
 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_attrs      = mmc_dev_attrs,
 181         .match          = mmc_bus_match,
 182         .uevent         = mmc_bus_uevent,
 183         .probe          = mmc_bus_probe,
 184         .remove         = mmc_bus_remove,
 185         .pm             = &mmc_bus_pm_ops,
 186 };
 187
 188 int mmc_register_bus(void)
 189 {
 190         return bus_register(&mmc_bus_type);
 191 }
 192
 193 void mmc_unregister_bus(void)
 194 {
 195         bus_unregister(&mmc_bus_type);
 196 }
 197
 198 /**
 199  *      mmc_register_driver - register a media driver
 200  *      @drv: MMC media driver
 201  */
 202 int mmc_register_driver(struct mmc_driver *drv)
 203 {
 204         drv->drv.bus = &mmc_bus_type;
 205         return driver_register(&drv->drv);
 206 }
 207
 208 EXPORT_SYMBOL(mmc_register_driver);
 209
 210 /**
 211  *      mmc_unregister_driver - unregister a media driver
 212  *      @drv: MMC media driver
 213  */
 214 void mmc_unregister_driver(struct mmc_driver *drv)
 215 {
 216         drv->drv.bus = &mmc_bus_type;
 217         driver_unregister(&drv->drv);
 218 }
 219
 220 EXPORT_SYMBOL(mmc_unregister_driver);
 221
 222 static void mmc_release_card(struct device *dev)
 223 {
 224         struct mmc_card *card = mmc_dev_to_card(dev);
 225
 226         sdio_free_common_cis(card);
 227
 228         kfree(card->info);
 229
 230         kfree(card);
 231 }
 232
 233 /*
 234  * Allocate and initialise a new MMC card structure.
 235  */
 236 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 237 {
 238         struct mmc_card *card;
 239
 240         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 241         if (!card)
 242                 return ERR_PTR(-ENOMEM);
 243
 244         card->host = host;
 245
 246         device_initialize(&card->dev);
 247
 248         card->dev.parent = mmc_classdev(host);
 249         card->dev.bus = &mmc_bus_type;
 250         card->dev.release = mmc_release_card;
 251         card->dev.type = type;
 252
 253         return card;
 254 }
 255
 256 /*
 257  * Register a new MMC card with the driver model.
 258  */
 259 int mmc_add_card(struct mmc_card *card)
 260 {
 261         int ret;
 262         const char *type;
 263         const char *uhs_bus_speed_mode = "";
 264         static const char *const uhs_speeds[] = {
 265                 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
 266                 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
 267                 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
 268                 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
 269                 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
 270         };
 271
 272
 273         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 274
 275         switch (card->type) {
 276         case MMC_TYPE_MMC:
 277                 type = "MMC";
 278                 break;
 279         case MMC_TYPE_SD:
 280                 type = "SD";
 281                 if (mmc_card_blockaddr(card)) {
 282                         if (mmc_card_ext_capacity(card))
 283                                 type = "SDXC";
 284                         else
 285                                 type = "SDHC";
 286                 }
 287                 break;
 288         case MMC_TYPE_SDIO:
 289                 type = "SDIO";
 290                 break;
 291         case MMC_TYPE_SD_COMBO:
 292                 type = "SD-combo";
 293                 if (mmc_card_blockaddr(card))
 294                         type = "SDHC-combo";
 295                 break;
 296         default:
 297                 type = "?";
 298                 break;
 299         }
 300
 301         if (mmc_sd_card_uhs(card) &&
 302                 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
 303                 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
 304
 305         if (mmc_host_is_spi(card->host)) {
 306                 pr_info("%s: new %s%s%s card on SPI\n",
 307                         mmc_hostname(card->host),
 308                         mmc_card_highspeed(card) ? "high speed " : "",
 309                         mmc_card_ddr_mode(card) ? "DDR " : "",
 310                         type);
 311         } else {
 312                 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
 313                         mmc_hostname(card->host),
 314                         mmc_card_uhs(card) ? "ultra high speed " :
 315                         (mmc_card_highspeed(card) ? "high speed " : ""),
 316                         (mmc_card_hs200(card) ? "HS200 " : ""),
 317                         mmc_card_ddr_mode(card) ? "DDR " : "",
 318                         uhs_bus_speed_mode, type, card->rca);
 319         }
 320
 321 #ifdef CONFIG_DEBUG_FS
 322         mmc_add_card_debugfs(card);
 323 #endif
 324
 325         ret = device_add(&card->dev);
 326         if (ret)
 327                 return ret;
 328
 329         mmc_card_set_present(card);
 330
 331         return 0;
 332 }
 333
 334 /*
 335  * Unregister a new MMC card with the driver model, and
 336  * (eventually) free it.
 337  */
 338 void mmc_remove_card(struct mmc_card *card)
 339 {
 340 #ifdef CONFIG_DEBUG_FS
 341         mmc_remove_card_debugfs(card);
 342 #endif
 343
 344         if (mmc_card_present(card)) {
 345                 if (mmc_host_is_spi(card->host)) {
 346                         pr_info("%s: SPI card removed\n",
 347                                 mmc_hostname(card->host));
 348                 } else {
 349                         pr_info("%s: card %04x removed\n",
 350                                 mmc_hostname(card->host), card->rca);
 351                 }
 352                 device_del(&card->dev);
 353         }
 354
 355         put_device(&card->dev);
 356 }
 357