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