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
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/host.h>
  19
  20 #include "sysfs.h"
  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         default:
  41                 return -EFAULT;
  42         }
  43 }
  44
  45 static struct device_attribute mmc_dev_attrs[] = {
  46         MMC_ATTR_RO(type),
  47         __ATTR_NULL,
  48 };
  49
  50 /*
  51  * This currently matches any MMC driver to any MMC card - drivers
  52  * themselves make the decision whether to drive this card in their
  53  * probe method.
  54  */
  55 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  56 {
  57         return 1;
  58 }
  59
  60 static int
  61 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
  62 {
  63         struct mmc_card *card = dev_to_mmc_card(dev);
  64         const char *type;
  65         int retval = 0;
  66
  67         switch (card->type) {
  68         case MMC_TYPE_MMC:
  69                 type = "MMC";
  70                 break;
  71         case MMC_TYPE_SD:
  72                 type = "SD";
  73                 break;
  74         case MMC_TYPE_SDIO:
  75                 type = "SDIO";
  76                 break;
  77         default:
  78                 type = NULL;
  79         }
  80
  81         if (type) {
  82                 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
  83                 if (retval)
  84                         return retval;
  85         }
  86
  87         retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
  88
  89         return retval;
  90 }
  91
  92 static int mmc_bus_probe(struct device *dev)
  93 {
  94         struct mmc_driver *drv = to_mmc_driver(dev->driver);
  95         struct mmc_card *card = dev_to_mmc_card(dev);
  96
  97         return drv->probe(card);
  98 }
  99
 100 static int mmc_bus_remove(struct device *dev)
 101 {
 102         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 103         struct mmc_card *card = dev_to_mmc_card(dev);
 104
 105         drv->remove(card);
 106
 107         return 0;
 108 }
 109
 110 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 111 {
 112         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 113         struct mmc_card *card = dev_to_mmc_card(dev);
 114         int ret = 0;
 115
 116         if (dev->driver && drv->suspend)
 117                 ret = drv->suspend(card, state);
 118         return ret;
 119 }
 120
 121 static int mmc_bus_resume(struct device *dev)
 122 {
 123         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 124         struct mmc_card *card = dev_to_mmc_card(dev);
 125         int ret = 0;
 126
 127         if (dev->driver && drv->resume)
 128                 ret = drv->resume(card);
 129         return ret;
 130 }
 131
 132 static struct bus_type mmc_bus_type = {
 133         .name           = "mmc",
 134         .dev_attrs      = mmc_dev_attrs,
 135         .match          = mmc_bus_match,
 136         .uevent         = mmc_bus_uevent,
 137         .probe          = mmc_bus_probe,
 138         .remove         = mmc_bus_remove,
 139         .suspend        = mmc_bus_suspend,
 140         .resume         = mmc_bus_resume,
 141 };
 142
 143 int mmc_register_bus(void)
 144 {
 145         return bus_register(&mmc_bus_type);
 146 }
 147
 148 void mmc_unregister_bus(void)
 149 {
 150         bus_unregister(&mmc_bus_type);
 151 }
 152
 153 /**
 154  *      mmc_register_driver - register a media driver
 155  *      @drv: MMC media driver
 156  */
 157 int mmc_register_driver(struct mmc_driver *drv)
 158 {
 159         drv->drv.bus = &mmc_bus_type;
 160         return driver_register(&drv->drv);
 161 }
 162
 163 EXPORT_SYMBOL(mmc_register_driver);
 164
 165 /**
 166  *      mmc_unregister_driver - unregister a media driver
 167  *      @drv: MMC media driver
 168  */
 169 void mmc_unregister_driver(struct mmc_driver *drv)
 170 {
 171         drv->drv.bus = &mmc_bus_type;
 172         driver_unregister(&drv->drv);
 173 }
 174
 175 EXPORT_SYMBOL(mmc_unregister_driver);
 176
 177 static void mmc_release_card(struct device *dev)
 178 {
 179         struct mmc_card *card = dev_to_mmc_card(dev);
 180
 181         sdio_free_common_cis(card);
 182
 183         if (card->info)
 184                 kfree(card->info);
 185
 186         kfree(card);
 187 }
 188
 189 /*
 190  * Allocate and initialise a new MMC card structure.
 191  */
 192 struct mmc_card *mmc_alloc_card(struct mmc_host *host)
 193 {
 194         struct mmc_card *card;
 195
 196         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 197         if (!card)
 198                 return ERR_PTR(-ENOMEM);
 199
 200         card->host = host;
 201
 202         device_initialize(&card->dev);
 203
 204         card->dev.parent = mmc_classdev(host);
 205         card->dev.bus = &mmc_bus_type;
 206         card->dev.release = mmc_release_card;
 207
 208         return card;
 209 }
 210
 211 /*
 212  * Register a new MMC card with the driver model.
 213  */
 214 int mmc_add_card(struct mmc_card *card)
 215 {
 216         int ret;
 217         const char *type;
 218
 219         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 220                  "%s:%04x", mmc_hostname(card->host), card->rca);
 221
 222         switch (card->type) {
 223         case MMC_TYPE_MMC:
 224                 type = "MMC";
 225                 break;
 226         case MMC_TYPE_SD:
 227                 type = "SD";
 228                 if (mmc_card_blockaddr(card))
 229                         type = "SDHC";
 230                 break;
 231         case MMC_TYPE_SDIO:
 232                 type = "SDIO";
 233                 break;
 234         default:
 235                 type = "?";
 236                 break;
 237         }
 238
 239         if (mmc_host_is_spi(card->host)) {
 240                 printk(KERN_INFO "%s: new %s%s card on SPI\n",
 241                         mmc_hostname(card->host),
 242                         mmc_card_highspeed(card) ? "high speed " : "",
 243                         type);
 244         } else {
 245                 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
 246                         mmc_hostname(card->host),
 247                         mmc_card_highspeed(card) ? "high speed " : "",
 248                         type, card->rca);
 249         }
 250
 251         card->dev.uevent_suppress = 1;
 252
 253         ret = device_add(&card->dev);
 254         if (ret)
 255                 return ret;
 256
 257         if (card->host->bus_ops->sysfs_add) {
 258                 ret = card->host->bus_ops->sysfs_add(card->host, card);
 259                 if (ret) {
 260                         device_del(&card->dev);
 261                         return ret;
 262                  }
 263         }
 264
 265         card->dev.uevent_suppress = 0;
 266
 267         kobject_uevent(&card->dev.kobj, KOBJ_ADD);
 268
 269         mmc_card_set_present(card);
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * Unregister a new MMC card with the driver model, and
 276  * (eventually) free it.
 277  */
 278 void mmc_remove_card(struct mmc_card *card)
 279 {
 280         if (mmc_card_present(card)) {
 281                 if (mmc_host_is_spi(card->host)) {
 282                         printk(KERN_INFO "%s: SPI card removed\n",
 283                                 mmc_hostname(card->host));
 284                 } else {
 285                         printk(KERN_INFO "%s: card %04x removed\n",
 286                                 mmc_hostname(card->host), card->rca);
 287                 }
 288
 289                 if (card->host->bus_ops->sysfs_remove)
 290                         card->host->bus_ops->sysfs_remove(card->host, card);
 291                 device_del(&card->dev);
 292         }
 293
 294         put_device(&card->dev);
 295 }
 296