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 "core.h"
  21 #include "sdio_cis.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         case MMC_TYPE_SDIO:
  38                 return sprintf(buf, "SDIO\n");
  39         default:
  40                 return -EFAULT;
  41         }
  42 }
  43
  44 static struct device_attribute mmc_dev_attrs[] = {
  45         __ATTR(type, S_IRUGO, mmc_type_show, NULL),
  46         __ATTR_NULL,
  47 };
  48
  49 /*
  50  * This currently matches any MMC driver to any MMC card - drivers
  51  * themselves make the decision whether to drive this card in their
  52  * probe method.
  53  */
  54 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  55 {
  56         return 1;
  57 }
  58
  59 static int
  60 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
  61 {
  62         struct mmc_card *card = dev_to_mmc_card(dev);
  63         const char *type;
  64         int retval = 0;
  65
  66         switch (card->type) {
  67         case MMC_TYPE_MMC:
  68                 type = "MMC";
  69                 break;
  70         case MMC_TYPE_SD:
  71                 type = "SD";
  72                 break;
  73         case MMC_TYPE_SDIO:
  74                 type = "SDIO";
  75                 break;
  76         default:
  77                 type = NULL;
  78         }
  79
  80         if (type) {
  81                 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
  82                 if (retval)
  83                         return retval;
  84         }
  85
  86         retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
  87
  88         return retval;
  89 }
  90
  91 static int mmc_bus_probe(struct device *dev)
  92 {
  93         struct mmc_driver *drv = to_mmc_driver(dev->driver);
  94         struct mmc_card *card = dev_to_mmc_card(dev);
  95
  96         return drv->probe(card);
  97 }
  98
  99 static int mmc_bus_remove(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         drv->remove(card);
 105
 106         return 0;
 107 }
 108
 109 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 110 {
 111         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 112         struct mmc_card *card = dev_to_mmc_card(dev);
 113         int ret = 0;
 114
 115         if (dev->driver && drv->suspend)
 116                 ret = drv->suspend(card, state);
 117         return ret;
 118 }
 119
 120 static int mmc_bus_resume(struct device *dev)
 121 {
 122         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 123         struct mmc_card *card = dev_to_mmc_card(dev);
 124         int ret = 0;
 125
 126         if (dev->driver && drv->resume)
 127                 ret = drv->resume(card);
 128         return ret;
 129 }
 130
 131 static struct bus_type mmc_bus_type = {
 132         .name           = "mmc",
 133         .dev_attrs      = mmc_dev_attrs,
 134         .match          = mmc_bus_match,
 135         .uevent         = mmc_bus_uevent,
 136         .probe          = mmc_bus_probe,
 137         .remove         = mmc_bus_remove,
 138         .suspend        = mmc_bus_suspend,
 139         .resume         = mmc_bus_resume,
 140 };
 141
 142 int mmc_register_bus(void)
 143 {
 144         return bus_register(&mmc_bus_type);
 145 }
 146
 147 void mmc_unregister_bus(void)
 148 {
 149         bus_unregister(&mmc_bus_type);
 150 }
 151
 152 /**
 153  *      mmc_register_driver - register a media driver
 154  *      @drv: MMC media driver
 155  */
 156 int mmc_register_driver(struct mmc_driver *drv)
 157 {
 158         drv->drv.bus = &mmc_bus_type;
 159         return driver_register(&drv->drv);
 160 }
 161
 162 EXPORT_SYMBOL(mmc_register_driver);
 163
 164 /**
 165  *      mmc_unregister_driver - unregister a media driver
 166  *      @drv: MMC media driver
 167  */
 168 void mmc_unregister_driver(struct mmc_driver *drv)
 169 {
 170         drv->drv.bus = &mmc_bus_type;
 171         driver_unregister(&drv->drv);
 172 }
 173
 174 EXPORT_SYMBOL(mmc_unregister_driver);
 175
 176 static void mmc_release_card(struct device *dev)
 177 {
 178         struct mmc_card *card = dev_to_mmc_card(dev);
 179
 180         sdio_free_common_cis(card);
 181
 182         if (card->info)
 183                 kfree(card->info);
 184
 185         kfree(card);
 186 }
 187
 188 /*
 189  * Allocate and initialise a new MMC card structure.
 190  */
 191 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
 192 {
 193         struct mmc_card *card;
 194
 195         card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
 196         if (!card)
 197                 return ERR_PTR(-ENOMEM);
 198
 199         card->host = host;
 200
 201         device_initialize(&card->dev);
 202
 203         card->dev.parent = mmc_classdev(host);
 204         card->dev.bus = &mmc_bus_type;
 205         card->dev.release = mmc_release_card;
 206         card->dev.type = type;
 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         ret = device_add(&card->dev);
 252         if (ret)
 253                 return ret;
 254
 255         mmc_card_set_present(card);
 256
 257         return 0;
 258 }
 259
 260 /*
 261  * Unregister a new MMC card with the driver model, and
 262  * (eventually) free it.
 263  */
 264 void mmc_remove_card(struct mmc_card *card)
 265 {
 266         if (mmc_card_present(card)) {
 267                 if (mmc_host_is_spi(card->host)) {
 268                         printk(KERN_INFO "%s: SPI card removed\n",
 269                                 mmc_hostname(card->host));
 270                 } else {
 271                         printk(KERN_INFO "%s: card %04x removed\n",
 272                                 mmc_hostname(card->host), card->rca);
 273                 }
 274                 device_del(&card->dev);
 275         }
 276
 277         put_device(&card->dev);
 278 }
 279