drivers/mmc/mmc_sysfs.c

   1 /*
   2  *  linux/drivers/mmc/mmc_sysfs.c
   3  *
   4  *  Copyright (C) 2003 Russell King, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  MMC sysfs/driver model support.
  11  */
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15 #include <linux/idr.h>
  16
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/host.h>
  19
  20 #include "mmc.h"
  21
  22 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
  23 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
  24 #define cls_dev_to_mmc_host(d)  container_of(d, struct mmc_host, class_dev)
  25
  26 #define MMC_ATTR(name, fmt, args...)                                    \
  27 static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf) \
  28 {                                                                       \
  29         struct mmc_card *card = dev_to_mmc_card(dev);                   \
  30         return sprintf(buf, fmt, args);                                 \
  31 }
  32
  33 MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
  34         card->raw_cid[2], card->raw_cid[3]);
  35 MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
  36         card->raw_csd[2], card->raw_csd[3]);
  37 MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
  38 MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
  39 MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
  40 MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
  41 MMC_ATTR(name, "%s\n", card->cid.prod_name);
  42 MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
  43 MMC_ATTR(serial, "0x%08x\n", card->cid.serial);
  44
  45 #define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
  46
  47 static struct device_attribute mmc_dev_attrs[] = {
  48         MMC_ATTR_RO(cid),
  49         MMC_ATTR_RO(csd),
  50         MMC_ATTR_RO(date),
  51         MMC_ATTR_RO(fwrev),
  52         MMC_ATTR_RO(hwrev),
  53         MMC_ATTR_RO(manfid),
  54         MMC_ATTR_RO(name),
  55         MMC_ATTR_RO(oemid),
  56         MMC_ATTR_RO(serial),
  57         __ATTR_NULL
  58 };
  59
  60
  61 static void mmc_release_card(struct device *dev)
  62 {
  63         struct mmc_card *card = dev_to_mmc_card(dev);
  64
  65         kfree(card);
  66 }
  67
  68 /*
  69  * This currently matches any MMC driver to any MMC card - drivers
  70  * themselves make the decision whether to drive this card in their
  71  * probe method.  However, we force "bad" cards to fail.
  72  */
  73 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  74 {
  75         struct mmc_card *card = dev_to_mmc_card(dev);
  76         return !mmc_card_bad(card);
  77 }
  78
  79 static int
  80 mmc_bus_hotplug(struct device *dev, char **envp, int num_envp, char *buf,
  81                 int buf_size)
  82 {
  83         struct mmc_card *card = dev_to_mmc_card(dev);
  84         char ccc[13];
  85         int i = 0;
  86
  87 #define add_env(fmt,val)                                                \
  88         ({                                                              \
  89                 int len, ret = -ENOMEM;                                 \
  90                 if (i < num_envp) {                                     \
  91                         envp[i++] = buf;                                \
  92                         len = snprintf(buf, buf_size, fmt, val) + 1;    \
  93                         buf_size -= len;                                \
  94                         buf += len;                                     \
  95                         if (buf_size >= 0)                              \
  96                                 ret = 0;                                \
  97                 }                                                       \
  98                 ret;                                                    \
  99         })
 100
 101         for (i = 0; i < 12; i++)
 102                 ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
 103         ccc[12] = '\0';
 104
 105         i = 0;
 106         add_env("MMC_CCC=%s", ccc);
 107         add_env("MMC_MANFID=%06x", card->cid.manfid);
 108         add_env("MMC_NAME=%s", mmc_card_name(card));
 109         add_env("MMC_OEMID=%04x", card->cid.oemid);
 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         .hotplug        = mmc_bus_hotplug,
 141         .suspend        = mmc_bus_suspend,
 142         .resume         = mmc_bus_resume,
 143 };
 144
 145
 146 static int mmc_drv_probe(struct device *dev)
 147 {
 148         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 149         struct mmc_card *card = dev_to_mmc_card(dev);
 150
 151         return drv->probe(card);
 152 }
 153
 154 static int mmc_drv_remove(struct device *dev)
 155 {
 156         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 157         struct mmc_card *card = dev_to_mmc_card(dev);
 158
 159         drv->remove(card);
 160
 161         return 0;
 162 }
 163
 164
 165 /**
 166  *      mmc_register_driver - register a media driver
 167  *      @drv: MMC media driver
 168  */
 169 int mmc_register_driver(struct mmc_driver *drv)
 170 {
 171         drv->drv.bus = &mmc_bus_type;
 172         drv->drv.probe = mmc_drv_probe;
 173         drv->drv.remove = mmc_drv_remove;
 174         return driver_register(&drv->drv);
 175 }
 176
 177 EXPORT_SYMBOL(mmc_register_driver);
 178
 179 /**
 180  *      mmc_unregister_driver - unregister a media driver
 181  *      @drv: MMC media driver
 182  */
 183 void mmc_unregister_driver(struct mmc_driver *drv)
 184 {
 185         drv->drv.bus = &mmc_bus_type;
 186         driver_unregister(&drv->drv);
 187 }
 188
 189 EXPORT_SYMBOL(mmc_unregister_driver);
 190
 191
 192 /*
 193  * Internal function.  Initialise a MMC card structure.
 194  */
 195 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
 196 {
 197         memset(card, 0, sizeof(struct mmc_card));
 198         card->host = host;
 199         device_initialize(&card->dev);
 200         card->dev.parent = card->host->dev;
 201         card->dev.bus = &mmc_bus_type;
 202         card->dev.release = mmc_release_card;
 203 }
 204
 205 /*
 206  * Internal function.  Register a new MMC card with the driver model.
 207  */
 208 int mmc_register_card(struct mmc_card *card)
 209 {
 210         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 211                  "%s:%04x", mmc_hostname(card->host), card->rca);
 212
 213         return device_add(&card->dev);
 214 }
 215
 216 /*
 217  * Internal function.  Unregister a new MMC card with the
 218  * driver model, and (eventually) free it.
 219  */
 220 void mmc_remove_card(struct mmc_card *card)
 221 {
 222         if (mmc_card_present(card))
 223                 device_del(&card->dev);
 224
 225         put_device(&card->dev);
 226 }
 227
 228
 229 static void mmc_host_classdev_release(struct class_device *dev)
 230 {
 231         struct mmc_host *host = cls_dev_to_mmc_host(dev);
 232         kfree(host);
 233 }
 234
 235 static struct class mmc_host_class = {
 236         .name           = "mmc_host",
 237         .release        = mmc_host_classdev_release,
 238 };
 239
 240 static DEFINE_IDR(mmc_host_idr);
 241 static DEFINE_SPINLOCK(mmc_host_lock);
 242
 243 /*
 244  * Internal function. Allocate a new MMC host.
 245  */
 246 struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
 247 {
 248         struct mmc_host *host;
 249
 250         host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
 251         if (host) {
 252                 memset(host, 0, sizeof(struct mmc_host) + extra);
 253
 254                 host->dev = dev;
 255                 host->class_dev.dev = host->dev;
 256                 host->class_dev.class = &mmc_host_class;
 257                 class_device_initialize(&host->class_dev);
 258         }
 259
 260         return host;
 261 }
 262
 263 /*
 264  * Internal function. Register a new MMC host with the MMC class.
 265  */
 266 int mmc_add_host_sysfs(struct mmc_host *host)
 267 {
 268         int err;
 269
 270         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
 271                 return -ENOMEM;
 272
 273         spin_lock(&mmc_host_lock);
 274         err = idr_get_new(&mmc_host_idr, host, &host->index);
 275         spin_unlock(&mmc_host_lock);
 276         if (err)
 277                 return err;
 278
 279         snprintf(host->class_dev.class_id, BUS_ID_SIZE,
 280                  "mmc%d", host->index);
 281
 282         return class_device_add(&host->class_dev);
 283 }
 284
 285 /*
 286  * Internal function. Unregister a MMC host with the MMC class.
 287  */
 288 void mmc_remove_host_sysfs(struct mmc_host *host)
 289 {
 290         class_device_del(&host->class_dev);
 291
 292         spin_lock(&mmc_host_lock);
 293         idr_remove(&mmc_host_idr, host->index);
 294         spin_unlock(&mmc_host_lock);
 295 }
 296
 297 /*
 298  * Internal function. Free a MMC host.
 299  */
 300 void mmc_free_host_sysfs(struct mmc_host *host)
 301 {
 302         class_device_put(&host->class_dev);
 303 }
 304
 305
 306 static int __init mmc_init(void)
 307 {
 308         int ret = bus_register(&mmc_bus_type);
 309         if (ret == 0) {
 310                 ret = class_register(&mmc_host_class);
 311                 if (ret)
 312                         bus_unregister(&mmc_bus_type);
 313         }
 314         return ret;
 315 }
 316
 317 static void __exit mmc_exit(void)
 318 {
 319         class_unregister(&mmc_host_class);
 320         bus_unregister(&mmc_bus_type);
 321 }
 322
 323 module_init(mmc_init);
 324 module_exit(mmc_exit);