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