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/device.h>
  15 #include <linux/err.h>
  16 #include <linux/slab.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <linux/mmc/card.h>
  20 #include <linux/mmc/host.h>
  21
  22 #include "core.h"
  23 #include "sdio_cis.h"
  24 #include "bus.h"
  25
  26 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
  27
  28 static ssize_t mmc_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
  47 static struct device_attribute mmc_dev_attrs[] = {
  48         __ATTR(type, S_IRUGO, mmc_type_show, NULL),
  49         __ATTR_NULL,
  50 };
  51
  52 /*
  53  * This currently matches any MMC driver to any MMC card - drivers
  54  * themselves make the decision whether to drive this card in their
  55  * probe method.
  56  */
  57 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  58 {
  59         return 1;
  60 }
  61
  62 static int
  63 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
  64 {
  65         struct mmc_card *card = mmc_dev_to_card(dev);
  66         const char *type;
  67         int retval = 0;
  68
  69         switch (card->type) {
  70         case MMC_TYPE_MMC:
  71                 type = "MMC";
  72                 break;
  73         case MMC_TYPE_SD:
  74                 type = "SD";
  75                 break;
  76         case MMC_TYPE_SDIO:
  77                 type = "SDIO";
  78                 break;
  79         case MMC_TYPE_SD_COMBO:
  80                 type = "SDcombo";
  81                 break;
  82         default:
  83                 type = NULL;
  84         }
  85
  86         if (type) {
  87                 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
  88                 if (retval)
  89                         return retval;
  90         }
  91
  92         retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
  93         if (retval)
  94                 return retval;
  95
  96         /*
  97          * Request the mmc_block device.  Note: that this is a direct request
  98          * for the module it carries no information as to what is inserted.
  99          */
 100         retval = add_uevent_var(env, "MODALIAS=mmc:block");
 101
 102         return retval;
 103 }
 104
 105 static int mmc_bus_probe(struct device *dev)
 106 {
 107         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 108         struct mmc_card *card = mmc_dev_to_card(dev);
 109
 110         return drv->probe(card);
 111 }
 112
 113 static int mmc_bus_remove(struct device *dev)
 114 {
 115         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 116         struct mmc_card *card = mmc_dev_to_card(dev);
 117
 118         drv->remove(card);
 119
 120         return 0;
 121 }
 122
 123 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 124 {
 125         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 126         struct mmc_card *card = mmc_dev_to_card(dev);
 127         int ret = 0;
 128
 129         if (dev->driver && drv->suspend)
 130                 ret = drv->suspend(card, state);
 131         return ret;
 132 }
 133
 134 static int mmc_bus_resume(struct device *dev)
 135 {
 136         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 137         struct mmc_card *card = mmc_dev_to_card(dev);
 138         int ret = 0;
 139
 140         if (dev->driver && drv->resume)
 141                 ret = drv->resume(card);
 142         return ret;
 143 }
 144
 145 #ifdef CONFIG_PM_RUNTIME
 146
 147 static int mmc_runtime_suspend(struct device *dev)
 148 {
 149         struct mmc_card *card = mmc_dev_to_card(dev);
 150
 151         return mmc_power_save_host(card->host);
 152 }
 153
 154 static int mmc_runtime_resume(struct device *dev)
 155 {
 156         struct mmc_card *card = mmc_dev_to_card(dev);
 157
 158         return mmc_power_restore_host(card->host);
 159 }
 160
 161 static int mmc_runtime_idle(struct device *dev)
 162 {
 163         return pm_runtime_suspend(dev);
 164 }
 165
 166 static const struct dev_pm_ops mmc_bus_pm_ops = {
 167         .runtime_suspend        = mmc_runtime_suspend,
 168         .runtime_resume         = mmc_runtime_resume,
 169         .runtime_idle           = mmc_runtime_idle,
 170 };
 171
 172 #define MMC_PM_OPS_PTR  (&mmc_bus_pm_ops)
 173
 174 #else /* !CONFIG_PM_RUNTIME */
 175
 176 #define MMC_PM_OPS_PTR  NULL
 177
 178 #endif /* !CONFIG_PM_RUNTIME */
 179
 180 static struct bus_type mmc_bus_type = {
 181         .name           = "mmc",
 182         .dev_attrs      = mmc_dev_attrs,
 183         .match          = mmc_bus_match,
 184         .uevent         = mmc_bus_uevent,
 185         .probe          = mmc_bus_probe,
 186         .remove         = mmc_bus_remove,
 187         .suspend        = mmc_bus_suspend,
 188         .resume         = mmc_bus_resume,
 189         .pm             = MMC_PM_OPS_PTR,
 190 };
 191
 192 int mmc_register_bus(void)
 193 {
 194         return bus_register(&mmc_bus_type);
 195 }
 196
 197 void mmc_unregister_bus(void)
 198 {
 199         bus_unregister(&mmc_bus_type);
 200 }
 201
 202 /**
 203  *      mmc_register_driver - register a media driver
 204  *      @drv: MMC media driver
 205  */
 206 int mmc_register_driver(struct mmc_driver *drv)
 207 {
 208         drv->drv.bus = &mmc_bus_type;
 209         return driver_register(&drv->drv);
 210 }
 211
 212 EXPORT_SYMBOL(mmc_register_driver);
 213
 214 /**
 215  *      mmc_unregister_driver - unregister a media driver
 216  *      @drv: MMC media driver
 217  */
 218 void mmc_unregister_driver(struct mmc_driver *drv)
 219 {
 220         drv->drv.bus = &mmc_bus_type;
 221         driver_unregister(&drv->drv);
 222 }
 223
 224 EXPORT_SYMBOL(mmc_unregister_driver);
 225
 226 static void mmc_release_card(struct device *dev)
 227 {
 228         struct mmc_card *card = mmc_dev_to_card(dev);
 229
 230         sdio_free_common_cis(card);
 231
 232         if (card->info)
 233                 kfree(card->info);
 234
 235         kfree(card);
 236 }
 237
 238 /*
 239  * Allocate and initialise a new MMC card structure.
 240  */
 241 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 242 {
 243         struct mmc_card *card;
 244
 245         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 246         if (!card)
 247                 return ERR_PTR(-ENOMEM);
 248
 249         card->host = host;
 250
 251         device_initialize(&card->dev);
 252
 253         card->dev.parent = mmc_classdev(host);
 254         card->dev.bus = &mmc_bus_type;
 255         card->dev.release = mmc_release_card;
 256         card->dev.type = type;
 257
 258         return card;
 259 }
 260
 261 /*
 262  * Register a new MMC card with the driver model.
 263  */
 264 int mmc_add_card(struct mmc_card *card)
 265 {
 266         int ret;
 267         const char *type;
 268
 269         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 270
 271         switch (card->type) {
 272         case MMC_TYPE_MMC:
 273                 type = "MMC";
 274                 break;
 275         case MMC_TYPE_SD:
 276                 type = "SD";
 277                 if (mmc_card_blockaddr(card)) {
 278                         if (mmc_card_ext_capacity(card))
 279                                 type = "SDXC";
 280                         else
 281                                 type = "SDHC";
 282                 }
 283                 break;
 284         case MMC_TYPE_SDIO:
 285                 type = "SDIO";
 286                 break;
 287         case MMC_TYPE_SD_COMBO:
 288                 type = "SD-combo";
 289                 if (mmc_card_blockaddr(card))
 290                         type = "SDHC-combo";
 291                 break;
 292         default:
 293                 type = "?";
 294                 break;
 295         }
 296
 297         if (mmc_host_is_spi(card->host)) {
 298                 printk(KERN_INFO "%s: new %s%s%s card on SPI\n",
 299                         mmc_hostname(card->host),
 300                         mmc_card_highspeed(card) ? "high speed " : "",
 301                         mmc_card_ddr_mode(card) ? "DDR " : "",
 302                         type);
 303         } else {
 304                 printk(KERN_INFO "%s: new %s%s%s card at address %04x\n",
 305                         mmc_hostname(card->host),
 306                         mmc_sd_card_uhs(card) ? "ultra high speed " :
 307                         (mmc_card_highspeed(card) ? "high speed " : ""),
 308                         mmc_card_ddr_mode(card) ? "DDR " : "",
 309                         type, card->rca);
 310         }
 311
 312 #ifdef CONFIG_DEBUG_FS
 313         mmc_add_card_debugfs(card);
 314 #endif
 315
 316         ret = device_add(&card->dev);
 317         if (ret)
 318                 return ret;
 319
 320         mmc_card_set_present(card);
 321
 322         return 0;
 323 }
 324
 325 /*
 326  * Unregister a new MMC card with the driver model, and
 327  * (eventually) free it.
 328  */
 329 void mmc_remove_card(struct mmc_card *card)
 330 {
 331 #ifdef CONFIG_DEBUG_FS
 332         mmc_remove_card_debugfs(card);
 333 #endif
 334
 335         if (mmc_card_present(card)) {
 336                 if (mmc_host_is_spi(card->host)) {
 337                         printk(KERN_INFO "%s: SPI card removed\n",
 338                                 mmc_hostname(card->host));
 339                 } else {
 340                         printk(KERN_INFO "%s: card %04x removed\n",
 341                                 mmc_hostname(card->host), card->rca);
 342                 }
 343                 device_del(&card->dev);
 344         }
 345
 346         put_device(&card->dev);
 347 }
 348