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 "bus.h"
  23
  24 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
  25 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
  26
  27 static ssize_t mmc_type_show(struct device *dev,
  28         struct device_attribute *attr, char *buf)
  29 {
  30         struct mmc_card *card = dev_to_mmc_card(dev);
  31
  32         switch (card->type) {
  33         case MMC_TYPE_MMC:
  34                 return sprintf(buf, "MMC\n");
  35         case MMC_TYPE_SD:
  36                 return sprintf(buf, "SD\n");
  37         default:
  38                 return -EFAULT;
  39         }
  40 }
  41
  42 static struct device_attribute mmc_dev_attrs[] = {
  43         MMC_ATTR_RO(type),
  44         __ATTR_NULL,
  45 };
  46
  47 /*
  48  * This currently matches any MMC driver to any MMC card - drivers
  49  * themselves make the decision whether to drive this card in their
  50  * probe method.
  51  */
  52 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  53 {
  54         return 1;
  55 }
  56
  57 static int
  58 mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
  59                 int buf_size)
  60 {
  61         struct mmc_card *card = dev_to_mmc_card(dev);
  62         int retval = 0, i = 0, length = 0;
  63
  64 #define add_env(fmt,val) do {                                   \
  65         retval = add_uevent_var(envp, num_envp, &i,             \
  66                                 buf, buf_size, &length,         \
  67                                 fmt, val);                      \
  68         if (retval)                                             \
  69                 return retval;                                  \
  70 } while (0);
  71
  72         switch (card->type) {
  73         case MMC_TYPE_MMC:
  74                 add_env("MMC_TYPE=%s", "MMC");
  75                 break;
  76         case MMC_TYPE_SD:
  77                 add_env("MMC_TYPE=%s", "SD");
  78                 break;
  79         }
  80
  81         add_env("MMC_NAME=%s", mmc_card_name(card));
  82
  83 #undef add_env
  84
  85         envp[i] = NULL;
  86
  87         return 0;
  88 }
  89
  90 static int mmc_bus_probe(struct device *dev)
  91 {
  92         struct mmc_driver *drv = to_mmc_driver(dev->driver);
  93         struct mmc_card *card = dev_to_mmc_card(dev);
  94
  95         return drv->probe(card);
  96 }
  97
  98 static int mmc_bus_remove(struct device *dev)
  99 {
 100         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 101         struct mmc_card *card = dev_to_mmc_card(dev);
 102
 103         drv->remove(card);
 104
 105         return 0;
 106 }
 107
 108 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 109 {
 110         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 111         struct mmc_card *card = dev_to_mmc_card(dev);
 112         int ret = 0;
 113
 114         if (dev->driver && drv->suspend)
 115                 ret = drv->suspend(card, state);
 116         return ret;
 117 }
 118
 119 static int mmc_bus_resume(struct device *dev)
 120 {
 121         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 122         struct mmc_card *card = dev_to_mmc_card(dev);
 123         int ret = 0;
 124
 125         if (dev->driver && drv->resume)
 126                 ret = drv->resume(card);
 127         return ret;
 128 }
 129
 130 static struct bus_type mmc_bus_type = {
 131         .name           = "mmc",
 132         .dev_attrs      = mmc_dev_attrs,
 133         .match          = mmc_bus_match,
 134         .uevent         = mmc_bus_uevent,
 135         .probe          = mmc_bus_probe,
 136         .remove         = mmc_bus_remove,
 137         .suspend        = mmc_bus_suspend,
 138         .resume         = mmc_bus_resume,
 139 };
 140
 141 int mmc_register_bus(void)
 142 {
 143         return bus_register(&mmc_bus_type);
 144 }
 145
 146 void mmc_unregister_bus(void)
 147 {
 148         bus_unregister(&mmc_bus_type);
 149 }
 150
 151 /**
 152  *      mmc_register_driver - register a media driver
 153  *      @drv: MMC media driver
 154  */
 155 int mmc_register_driver(struct mmc_driver *drv)
 156 {
 157         drv->drv.bus = &mmc_bus_type;
 158         return driver_register(&drv->drv);
 159 }
 160
 161 EXPORT_SYMBOL(mmc_register_driver);
 162
 163 /**
 164  *      mmc_unregister_driver - unregister a media driver
 165  *      @drv: MMC media driver
 166  */
 167 void mmc_unregister_driver(struct mmc_driver *drv)
 168 {
 169         drv->drv.bus = &mmc_bus_type;
 170         driver_unregister(&drv->drv);
 171 }
 172
 173 EXPORT_SYMBOL(mmc_unregister_driver);
 174
 175 static void mmc_release_card(struct device *dev)
 176 {
 177         struct mmc_card *card = dev_to_mmc_card(dev);
 178
 179         kfree(card);
 180 }
 181
 182 /*
 183  * Allocate and initialise a new MMC card structure.
 184  */
 185 struct mmc_card *mmc_alloc_card(struct mmc_host *host)
 186 {
 187         struct mmc_card *card;
 188
 189         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 190         if (!card)
 191                 return ERR_PTR(-ENOMEM);
 192
 193         card->host = host;
 194
 195         device_initialize(&card->dev);
 196
 197         card->dev.parent = mmc_classdev(host);
 198         card->dev.bus = &mmc_bus_type;
 199         card->dev.release = mmc_release_card;
 200
 201         return card;
 202 }
 203
 204 /*
 205  * Register a new MMC card with the driver model.
 206  */
 207 int mmc_add_card(struct mmc_card *card)
 208 {
 209         int ret;
 210         const char *type;
 211
 212         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 213                  "%s:%04x", mmc_hostname(card->host), card->rca);
 214
 215         switch (card->type) {
 216         case MMC_TYPE_MMC:
 217                 type = "MMC";
 218                 break;
 219         case MMC_TYPE_SD:
 220                 type = "SD";
 221                 if (mmc_card_blockaddr(card))
 222                         type = "SDHC";
 223                 break;
 224         default:
 225                 type = "?";
 226                 break;
 227         }
 228
 229         printk(KERN_INFO "%s: new %s%s card at address %04x\n",
 230                 mmc_hostname(card->host),
 231                 mmc_card_highspeed(card) ? "high speed " : "",
 232                 type, card->rca);
 233
 234         card->dev.uevent_suppress = 1;
 235
 236         ret = device_add(&card->dev);
 237         if (ret)
 238                 return ret;
 239
 240         if (card->host->bus_ops->sysfs_add) {
 241                 ret = card->host->bus_ops->sysfs_add(card->host, card);
 242                 if (ret) {
 243                         device_del(&card->dev);
 244                         return ret;
 245                  }
 246         }
 247
 248         card->dev.uevent_suppress = 0;
 249
 250         kobject_uevent(&card->dev.kobj, KOBJ_ADD);
 251
 252         mmc_card_set_present(card);
 253
 254         return 0;
 255 }
 256
 257 /*
 258  * Unregister a new MMC card with the driver model, and
 259  * (eventually) free it.
 260  */
 261 void mmc_remove_card(struct mmc_card *card)
 262 {
 263         if (mmc_card_present(card)) {
 264                 printk(KERN_INFO "%s: card %04x removed\n",
 265                         mmc_hostname(card->host), card->rca);
 266
 267                 if (card->host->bus_ops->sysfs_remove)
 268                         card->host->bus_ops->sysfs_remove(card->host, card);
 269                 device_del(&card->dev);
 270         }
 271
 272         put_device(&card->dev);
 273 }
 274