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
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/host.h>
  20
  21 #include "core.h"
  22 #include "sdio_cis.h"
  23 #include "bus.h"
  24
  25 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
  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 = dev_to_mmc_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 = dev_to_mmc_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 = dev_to_mmc_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 = dev_to_mmc_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 = dev_to_mmc_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 = dev_to_mmc_card(dev);
 138         int ret = 0;
 139
 140         if (dev->driver && drv->resume)
 141                 ret = drv->resume(card);
 142         return ret;
 143 }
 144
 145 static struct bus_type mmc_bus_type = {
 146         .name           = "mmc",
 147         .dev_attrs      = mmc_dev_attrs,
 148         .match          = mmc_bus_match,
 149         .uevent         = mmc_bus_uevent,
 150         .probe          = mmc_bus_probe,
 151         .remove         = mmc_bus_remove,
 152         .suspend        = mmc_bus_suspend,
 153         .resume         = mmc_bus_resume,
 154 };
 155
 156 int mmc_register_bus(void)
 157 {
 158         return bus_register(&mmc_bus_type);
 159 }
 160
 161 void mmc_unregister_bus(void)
 162 {
 163         bus_unregister(&mmc_bus_type);
 164 }
 165
 166 /**
 167  *      mmc_register_driver - register a media driver
 168  *      @drv: MMC media driver
 169  */
 170 int mmc_register_driver(struct mmc_driver *drv)
 171 {
 172         drv->drv.bus = &mmc_bus_type;
 173         return driver_register(&drv->drv);
 174 }
 175
 176 EXPORT_SYMBOL(mmc_register_driver);
 177
 178 /**
 179  *      mmc_unregister_driver - unregister a media driver
 180  *      @drv: MMC media driver
 181  */
 182 void mmc_unregister_driver(struct mmc_driver *drv)
 183 {
 184         drv->drv.bus = &mmc_bus_type;
 185         driver_unregister(&drv->drv);
 186 }
 187
 188 EXPORT_SYMBOL(mmc_unregister_driver);
 189
 190 static void mmc_release_card(struct device *dev)
 191 {
 192         struct mmc_card *card = dev_to_mmc_card(dev);
 193
 194         sdio_free_common_cis(card);
 195
 196         if (card->info)
 197                 kfree(card->info);
 198
 199         kfree(card);
 200 }
 201
 202 /*
 203  * Allocate and initialise a new MMC card structure.
 204  */
 205 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 206 {
 207         struct mmc_card *card;
 208
 209         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 210         if (!card)
 211                 return ERR_PTR(-ENOMEM);
 212
 213         card->host = host;
 214
 215         device_initialize(&card->dev);
 216
 217         card->dev.parent = mmc_classdev(host);
 218         card->dev.bus = &mmc_bus_type;
 219         card->dev.release = mmc_release_card;
 220         card->dev.type = type;
 221
 222         return card;
 223 }
 224
 225 /*
 226  * Register a new MMC card with the driver model.
 227  */
 228 int mmc_add_card(struct mmc_card *card)
 229 {
 230         int ret;
 231         const char *type;
 232
 233         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 234
 235         switch (card->type) {
 236         case MMC_TYPE_MMC:
 237                 type = "MMC";
 238                 break;
 239         case MMC_TYPE_SD:
 240                 type = "SD";
 241                 if (mmc_card_blockaddr(card))
 242                         type = "SDHC";
 243                 break;
 244         case MMC_TYPE_SDIO:
 245                 type = "SDIO";
 246                 break;
 247         case MMC_TYPE_SD_COMBO:
 248                 type = "SD-combo";
 249                 if (mmc_card_blockaddr(card))
 250                         type = "SDHC-combo";
 251         default:
 252                 type = "?";
 253                 break;
 254         }
 255
 256         if (mmc_host_is_spi(card->host)) {
 257                 printk(KERN_INFO "%s: new %s%s card on SPI\n",
 258                         mmc_hostname(card->host),
 259                         mmc_card_highspeed(card) ? "high speed " : "",
 260                         type);
 261         } else {
 262                 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
 263                         mmc_hostname(card->host),
 264                         mmc_card_highspeed(card) ? "high speed " : "",
 265                         type, card->rca);
 266         }
 267
 268         ret = device_add(&card->dev);
 269         if (ret)
 270                 return ret;
 271
 272 #ifdef CONFIG_DEBUG_FS
 273         mmc_add_card_debugfs(card);
 274 #endif
 275
 276         mmc_card_set_present(card);
 277
 278         return 0;
 279 }
 280
 281 /*
 282  * Unregister a new MMC card with the driver model, and
 283  * (eventually) free it.
 284  */
 285 void mmc_remove_card(struct mmc_card *card)
 286 {
 287 #ifdef CONFIG_DEBUG_FS
 288         mmc_remove_card_debugfs(card);
 289 #endif
 290
 291         if (mmc_card_present(card)) {
 292                 if (mmc_host_is_spi(card->host)) {
 293                         printk(KERN_INFO "%s: SPI card removed\n",
 294                                 mmc_hostname(card->host));
 295                 } else {
 296                         printk(KERN_INFO "%s: card %04x removed\n",
 297                                 mmc_hostname(card->host), card->rca);
 298                 }
 299                 device_del(&card->dev);
 300         }
 301
 302         put_device(&card->dev);
 303 }
 304