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 int mmc_bus_suspend(struct device *dev, pm_message_t state)
 126 {
 127         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 128         struct mmc_card *card = mmc_dev_to_card(dev);
 129         int ret = 0;
 130
 131         if (dev->driver && drv->suspend)
 132                 ret = drv->suspend(card, state);
 133         return ret;
 134 }
 135
 136 static int mmc_bus_resume(struct device *dev)
 137 {
 138         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 139         struct mmc_card *card = mmc_dev_to_card(dev);
 140         int ret = 0;
 141
 142         if (dev->driver && drv->resume)
 143                 ret = drv->resume(card);
 144         return ret;
 145 }
 146
 147 #ifdef CONFIG_PM_RUNTIME
 148
 149 static int mmc_runtime_suspend(struct device *dev)
 150 {
 151         struct mmc_card *card = mmc_dev_to_card(dev);
 152
 153         return mmc_power_save_host(card->host);
 154 }
 155
 156 static int mmc_runtime_resume(struct device *dev)
 157 {
 158         struct mmc_card *card = mmc_dev_to_card(dev);
 159
 160         return mmc_power_restore_host(card->host);
 161 }
 162
 163 static int mmc_runtime_idle(struct device *dev)
 164 {
 165         return pm_runtime_suspend(dev);
 166 }
 167
 168 static const struct dev_pm_ops mmc_bus_pm_ops = {
 169         .runtime_suspend        = mmc_runtime_suspend,
 170         .runtime_resume         = mmc_runtime_resume,
 171         .runtime_idle           = mmc_runtime_idle,
 172 };
 173
 174 #define MMC_PM_OPS_PTR  (&mmc_bus_pm_ops)
 175
 176 #else /* !CONFIG_PM_RUNTIME */
 177
 178 #define MMC_PM_OPS_PTR  NULL
 179
 180 #endif /* !CONFIG_PM_RUNTIME */
 181
 182 static struct bus_type mmc_bus_type = {
 183         .name           = "mmc",
 184         .dev_attrs      = mmc_dev_attrs,
 185         .match          = mmc_bus_match,
 186         .uevent         = mmc_bus_uevent,
 187         .probe          = mmc_bus_probe,
 188         .remove         = mmc_bus_remove,
 189         .suspend        = mmc_bus_suspend,
 190         .resume         = mmc_bus_resume,
 191         .pm             = MMC_PM_OPS_PTR,
 192 };
 193
 194 int mmc_register_bus(void)
 195 {
 196         return bus_register(&mmc_bus_type);
 197 }
 198
 199 void mmc_unregister_bus(void)
 200 {
 201         bus_unregister(&mmc_bus_type);
 202 }
 203
 204 /**
 205  *      mmc_register_driver - register a media driver
 206  *      @drv: MMC media driver
 207  */
 208 int mmc_register_driver(struct mmc_driver *drv)
 209 {
 210         drv->drv.bus = &mmc_bus_type;
 211         return driver_register(&drv->drv);
 212 }
 213
 214 EXPORT_SYMBOL(mmc_register_driver);
 215
 216 /**
 217  *      mmc_unregister_driver - unregister a media driver
 218  *      @drv: MMC media driver
 219  */
 220 void mmc_unregister_driver(struct mmc_driver *drv)
 221 {
 222         drv->drv.bus = &mmc_bus_type;
 223         driver_unregister(&drv->drv);
 224 }
 225
 226 EXPORT_SYMBOL(mmc_unregister_driver);
 227
 228 static void mmc_release_card(struct device *dev)
 229 {
 230         struct mmc_card *card = mmc_dev_to_card(dev);
 231
 232         sdio_free_common_cis(card);
 233
 234         if (card->info)
 235                 kfree(card->info);
 236
 237         kfree(card);
 238 }
 239
 240 /*
 241  * Allocate and initialise a new MMC card structure.
 242  */
 243 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 244 {
 245         struct mmc_card *card;
 246
 247         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 248         if (!card)
 249                 return ERR_PTR(-ENOMEM);
 250
 251         card->host = host;
 252
 253         device_initialize(&card->dev);
 254
 255         card->dev.parent = mmc_classdev(host);
 256         card->dev.bus = &mmc_bus_type;
 257         card->dev.release = mmc_release_card;
 258         card->dev.type = type;
 259
 260         return card;
 261 }
 262
 263 /*
 264  * Register a new MMC card with the driver model.
 265  */
 266 int mmc_add_card(struct mmc_card *card)
 267 {
 268         int ret;
 269         const char *type;
 270
 271         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 272
 273         switch (card->type) {
 274         case MMC_TYPE_MMC:
 275                 type = "MMC";
 276                 break;
 277         case MMC_TYPE_SD:
 278                 type = "SD";
 279                 if (mmc_card_blockaddr(card)) {
 280                         if (mmc_card_ext_capacity(card))
 281                                 type = "SDXC";
 282                         else
 283                                 type = "SDHC";
 284                 }
 285                 break;
 286         case MMC_TYPE_SDIO:
 287                 type = "SDIO";
 288                 break;
 289         case MMC_TYPE_SD_COMBO:
 290                 type = "SD-combo";
 291                 if (mmc_card_blockaddr(card))
 292                         type = "SDHC-combo";
 293                 break;
 294         default:
 295                 type = "?";
 296                 break;
 297         }
 298
 299         if (mmc_host_is_spi(card->host)) {
 300                 pr_info("%s: new %s%s%s card on SPI\n",
 301                         mmc_hostname(card->host),
 302                         mmc_card_highspeed(card) ? "high speed " : "",
 303                         mmc_card_ddr_mode(card) ? "DDR " : "",
 304                         type);
 305         } else {
 306                 printk(KERN_INFO "%s: new %s%s%s card at address %04x\n",
 307                         mmc_hostname(card->host),
 308                         mmc_card_uhs(card) ? "ultra high speed " :
 309                         (mmc_card_highspeed(card) ? "high speed " : ""),
 310                         mmc_card_ddr_mode(card) ? "DDR " : "",
 311                         type, card->rca);
 312         }
 313
 314 #ifdef CONFIG_DEBUG_FS
 315         mmc_add_card_debugfs(card);
 316 #endif
 317
 318         ret = device_add(&card->dev);
 319         if (ret)
 320                 return ret;
 321
 322         mmc_card_set_present(card);
 323
 324         return 0;
 325 }
 326
 327 /*
 328  * Unregister a new MMC card with the driver model, and
 329  * (eventually) free it.
 330  */
 331 void mmc_remove_card(struct mmc_card *card)
 332 {
 333 #ifdef CONFIG_DEBUG_FS
 334         mmc_remove_card_debugfs(card);
 335 #endif
 336
 337         if (mmc_card_present(card)) {
 338                 if (mmc_host_is_spi(card->host)) {
 339                         pr_info("%s: SPI card removed\n",
 340                                 mmc_hostname(card->host));
 341                 } else {
 342                         pr_info("%s: card %04x removed\n",
 343                                 mmc_hostname(card->host), card->rca);
 344                 }
 345                 device_del(&card->dev);
 346         }
 347
 348         put_device(&card->dev);
 349 }
 350