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         default:
  41                 return -EFAULT;
  42         }
  43 }
  44
  45 static struct device_attribute mmc_dev_attrs[] = {
  46         __ATTR(type, S_IRUGO, mmc_type_show, NULL),
  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         if (retval)
  89                 return retval;
  90
  91         /*
  92          * Request the mmc_block device.  Note: that this is a direct request
  93          * for the module it carries no information as to what is inserted.
  94          */
  95         retval = add_uevent_var(env, "MODALIAS=mmc:block");
  96
  97         return retval;
  98 }
  99
 100 static int mmc_bus_probe(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         return drv->probe(card);
 106 }
 107
 108 static int mmc_bus_remove(struct device *dev)
 109 {
 110         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 111         struct mmc_card *card = dev_to_mmc_card(dev);
 112
 113         drv->remove(card);
 114
 115         return 0;
 116 }
 117
 118 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 119 {
 120         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 121         struct mmc_card *card = dev_to_mmc_card(dev);
 122         int ret = 0;
 123
 124         if (dev->driver && drv->suspend)
 125                 ret = drv->suspend(card, state);
 126         return ret;
 127 }
 128
 129 static int mmc_bus_resume(struct device *dev)
 130 {
 131         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 132         struct mmc_card *card = dev_to_mmc_card(dev);
 133         int ret = 0;
 134
 135         if (dev->driver && drv->resume)
 136                 ret = drv->resume(card);
 137         return ret;
 138 }
 139
 140 static struct bus_type mmc_bus_type = {
 141         .name           = "mmc",
 142         .dev_attrs      = mmc_dev_attrs,
 143         .match          = mmc_bus_match,
 144         .uevent         = mmc_bus_uevent,
 145         .probe          = mmc_bus_probe,
 146         .remove         = mmc_bus_remove,
 147         .suspend        = mmc_bus_suspend,
 148         .resume         = mmc_bus_resume,
 149 };
 150
 151 int mmc_register_bus(void)
 152 {
 153         return bus_register(&mmc_bus_type);
 154 }
 155
 156 void mmc_unregister_bus(void)
 157 {
 158         bus_unregister(&mmc_bus_type);
 159 }
 160
 161 /**
 162  *      mmc_register_driver - register a media driver
 163  *      @drv: MMC media driver
 164  */
 165 int mmc_register_driver(struct mmc_driver *drv)
 166 {
 167         drv->drv.bus = &mmc_bus_type;
 168         return driver_register(&drv->drv);
 169 }
 170
 171 EXPORT_SYMBOL(mmc_register_driver);
 172
 173 /**
 174  *      mmc_unregister_driver - unregister a media driver
 175  *      @drv: MMC media driver
 176  */
 177 void mmc_unregister_driver(struct mmc_driver *drv)
 178 {
 179         drv->drv.bus = &mmc_bus_type;
 180         driver_unregister(&drv->drv);
 181 }
 182
 183 EXPORT_SYMBOL(mmc_unregister_driver);
 184
 185 static void mmc_release_card(struct device *dev)
 186 {
 187         struct mmc_card *card = dev_to_mmc_card(dev);
 188
 189         sdio_free_common_cis(card);
 190
 191         if (card->info)
 192                 kfree(card->info);
 193
 194         kfree(card);
 195 }
 196
 197 /*
 198  * Allocate and initialise a new MMC card structure.
 199  */
 200 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 201 {
 202         struct mmc_card *card;
 203
 204         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 205         if (!card)
 206                 return ERR_PTR(-ENOMEM);
 207
 208         card->host = host;
 209
 210         device_initialize(&card->dev);
 211
 212         card->dev.parent = mmc_classdev(host);
 213         card->dev.bus = &mmc_bus_type;
 214         card->dev.release = mmc_release_card;
 215         card->dev.type = type;
 216
 217         return card;
 218 }
 219
 220 /*
 221  * Register a new MMC card with the driver model.
 222  */
 223 int mmc_add_card(struct mmc_card *card)
 224 {
 225         int ret;
 226         const char *type;
 227
 228         dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
 229
 230         switch (card->type) {
 231         case MMC_TYPE_MMC:
 232                 type = "MMC";
 233                 break;
 234         case MMC_TYPE_SD:
 235                 type = "SD";
 236                 if (mmc_card_blockaddr(card))
 237                         type = "SDHC";
 238                 break;
 239         case MMC_TYPE_SDIO:
 240                 type = "SDIO";
 241                 break;
 242         default:
 243                 type = "?";
 244                 break;
 245         }
 246
 247         if (mmc_host_is_spi(card->host)) {
 248                 printk(KERN_INFO "%s: new %s%s card on SPI\n",
 249                         mmc_hostname(card->host),
 250                         mmc_card_highspeed(card) ? "high speed " : "",
 251                         type);
 252         } else {
 253                 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
 254                         mmc_hostname(card->host),
 255                         mmc_card_highspeed(card) ? "high speed " : "",
 256                         type, card->rca);
 257         }
 258
 259         ret = device_add(&card->dev);
 260         if (ret)
 261                 return ret;
 262
 263 #ifdef CONFIG_DEBUG_FS
 264         mmc_add_card_debugfs(card);
 265 #endif
 266
 267         mmc_card_set_present(card);
 268
 269         return 0;
 270 }
 271
 272 /*
 273  * Unregister a new MMC card with the driver model, and
 274  * (eventually) free it.
 275  */
 276 void mmc_remove_card(struct mmc_card *card)
 277 {
 278 #ifdef CONFIG_DEBUG_FS
 279         mmc_remove_card_debugfs(card);
 280 #endif
 281
 282         if (mmc_card_present(card)) {
 283                 if (mmc_host_is_spi(card->host)) {
 284                         printk(KERN_INFO "%s: SPI card removed\n",
 285                                 mmc_hostname(card->host));
 286                 } else {
 287                         printk(KERN_INFO "%s: card %04x removed\n",
 288                                 mmc_hostname(card->host), card->rca);
 289                 }
 290                 device_del(&card->dev);
 291         }
 292
 293         put_device(&card->dev);
 294 }
 295