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(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
  38 MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
  39 MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
  40 MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
  41 MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
  42 MMC_ATTR(name, "%s\n", card->cid.prod_name);
  43 MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
  44 MMC_ATTR(serial, "0x%08x\n", card->cid.serial);
  45
  46 #define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
  47
  48 static struct device_attribute mmc_dev_attrs[] = {
  49         MMC_ATTR_RO(cid),
  50         MMC_ATTR_RO(csd),
  51         MMC_ATTR_RO(date),
  52         MMC_ATTR_RO(fwrev),
  53         MMC_ATTR_RO(hwrev),
  54         MMC_ATTR_RO(manfid),
  55         MMC_ATTR_RO(name),
  56         MMC_ATTR_RO(oemid),
  57         MMC_ATTR_RO(serial),
  58         __ATTR_NULL
  59 };
  60
  61 static struct device_attribute mmc_dev_attr_scr = MMC_ATTR_RO(scr);
  62
  63
  64 static void mmc_release_card(struct device *dev)
  65 {
  66         struct mmc_card *card = dev_to_mmc_card(dev);
  67
  68         kfree(card);
  69 }
  70
  71 /*
  72  * This currently matches any MMC driver to any MMC card - drivers
  73  * themselves make the decision whether to drive this card in their
  74  * probe method.  However, we force "bad" cards to fail.
  75  */
  76 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  77 {
  78         struct mmc_card *card = dev_to_mmc_card(dev);
  79         return !mmc_card_bad(card);
  80 }
  81
  82 static int
  83 mmc_bus_hotplug(struct device *dev, char **envp, int num_envp, char *buf,
  84                 int buf_size)
  85 {
  86         struct mmc_card *card = dev_to_mmc_card(dev);
  87         char ccc[13];
  88         int i = 0;
  89
  90 #define add_env(fmt,val)                                                \
  91         ({                                                              \
  92                 int len, ret = -ENOMEM;                                 \
  93                 if (i < num_envp) {                                     \
  94                         envp[i++] = buf;                                \
  95                         len = snprintf(buf, buf_size, fmt, val) + 1;    \
  96                         buf_size -= len;                                \
  97                         buf += len;                                     \
  98                         if (buf_size >= 0)                              \
  99                                 ret = 0;                                \
 100                 }                                                       \
 101                 ret;                                                    \
 102         })
 103
 104         for (i = 0; i < 12; i++)
 105                 ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
 106         ccc[12] = '\0';
 107
 108         i = 0;
 109         add_env("MMC_CCC=%s", ccc);
 110         add_env("MMC_MANFID=%06x", card->cid.manfid);
 111         add_env("MMC_NAME=%s", mmc_card_name(card));
 112         add_env("MMC_OEMID=%04x", card->cid.oemid);
 113
 114         return 0;
 115 }
 116
 117 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 118 {
 119         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 120         struct mmc_card *card = dev_to_mmc_card(dev);
 121         int ret = 0;
 122
 123         if (dev->driver && drv->suspend)
 124                 ret = drv->suspend(card, state);
 125         return ret;
 126 }
 127
 128 static int mmc_bus_resume(struct device *dev)
 129 {
 130         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 131         struct mmc_card *card = dev_to_mmc_card(dev);
 132         int ret = 0;
 133
 134         if (dev->driver && drv->resume)
 135                 ret = drv->resume(card);
 136         return ret;
 137 }
 138
 139 static struct bus_type mmc_bus_type = {
 140         .name           = "mmc",
 141         .dev_attrs      = mmc_dev_attrs,
 142         .match          = mmc_bus_match,
 143         .hotplug        = mmc_bus_hotplug,
 144         .suspend        = mmc_bus_suspend,
 145         .resume         = mmc_bus_resume,
 146 };
 147
 148
 149 static int mmc_drv_probe(struct device *dev)
 150 {
 151         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 152         struct mmc_card *card = dev_to_mmc_card(dev);
 153
 154         return drv->probe(card);
 155 }
 156
 157 static int mmc_drv_remove(struct device *dev)
 158 {
 159         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 160         struct mmc_card *card = dev_to_mmc_card(dev);
 161
 162         drv->remove(card);
 163
 164         return 0;
 165 }
 166
 167
 168 /**
 169  *      mmc_register_driver - register a media driver
 170  *      @drv: MMC media driver
 171  */
 172 int mmc_register_driver(struct mmc_driver *drv)
 173 {
 174         drv->drv.bus = &mmc_bus_type;
 175         drv->drv.probe = mmc_drv_probe;
 176         drv->drv.remove = mmc_drv_remove;
 177         return driver_register(&drv->drv);
 178 }
 179
 180 EXPORT_SYMBOL(mmc_register_driver);
 181
 182 /**
 183  *      mmc_unregister_driver - unregister a media driver
 184  *      @drv: MMC media driver
 185  */
 186 void mmc_unregister_driver(struct mmc_driver *drv)
 187 {
 188         drv->drv.bus = &mmc_bus_type;
 189         driver_unregister(&drv->drv);
 190 }
 191
 192 EXPORT_SYMBOL(mmc_unregister_driver);
 193
 194
 195 /*
 196  * Internal function.  Initialise a MMC card structure.
 197  */
 198 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
 199 {
 200         memset(card, 0, sizeof(struct mmc_card));
 201         card->host = host;
 202         device_initialize(&card->dev);
 203         card->dev.parent = card->host->dev;
 204         card->dev.bus = &mmc_bus_type;
 205         card->dev.release = mmc_release_card;
 206 }
 207
 208 /*
 209  * Internal function.  Register a new MMC card with the driver model.
 210  */
 211 int mmc_register_card(struct mmc_card *card)
 212 {
 213         int ret;
 214
 215         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 216                  "%s:%04x", mmc_hostname(card->host), card->rca);
 217
 218         ret = device_add(&card->dev);
 219         if (ret == 0) {
 220                 if (mmc_card_sd(card)) {
 221                         ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
 222                         if (ret)
 223                                 device_del(&card->dev);
 224                 }
 225         }
 226         return ret;
 227 }
 228
 229 /*
 230  * Internal function.  Unregister a new MMC card with the
 231  * driver model, and (eventually) free it.
 232  */
 233 void mmc_remove_card(struct mmc_card *card)
 234 {
 235         if (mmc_card_present(card)) {
 236                 if (mmc_card_sd(card))
 237                         device_remove_file(&card->dev, &mmc_dev_attr_scr);
 238
 239                 device_del(&card->dev);
 240         }
 241
 242         put_device(&card->dev);
 243 }
 244
 245
 246 static void mmc_host_classdev_release(struct class_device *dev)
 247 {
 248         struct mmc_host *host = cls_dev_to_mmc_host(dev);
 249         kfree(host);
 250 }
 251
 252 static struct class mmc_host_class = {
 253         .name           = "mmc_host",
 254         .release        = mmc_host_classdev_release,
 255 };
 256
 257 static DEFINE_IDR(mmc_host_idr);
 258 static DEFINE_SPINLOCK(mmc_host_lock);
 259
 260 /*
 261  * Internal function. Allocate a new MMC host.
 262  */
 263 struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
 264 {
 265         struct mmc_host *host;
 266
 267         host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
 268         if (host) {
 269                 memset(host, 0, sizeof(struct mmc_host) + extra);
 270
 271                 host->dev = dev;
 272                 host->class_dev.dev = host->dev;
 273                 host->class_dev.class = &mmc_host_class;
 274                 class_device_initialize(&host->class_dev);
 275         }
 276
 277         return host;
 278 }
 279
 280 /*
 281  * Internal function. Register a new MMC host with the MMC class.
 282  */
 283 int mmc_add_host_sysfs(struct mmc_host *host)
 284 {
 285         int err;
 286
 287         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
 288                 return -ENOMEM;
 289
 290         spin_lock(&mmc_host_lock);
 291         err = idr_get_new(&mmc_host_idr, host, &host->index);
 292         spin_unlock(&mmc_host_lock);
 293         if (err)
 294                 return err;
 295
 296         snprintf(host->class_dev.class_id, BUS_ID_SIZE,
 297                  "mmc%d", host->index);
 298
 299         return class_device_add(&host->class_dev);
 300 }
 301
 302 /*
 303  * Internal function. Unregister a MMC host with the MMC class.
 304  */
 305 void mmc_remove_host_sysfs(struct mmc_host *host)
 306 {
 307         class_device_del(&host->class_dev);
 308
 309         spin_lock(&mmc_host_lock);
 310         idr_remove(&mmc_host_idr, host->index);
 311         spin_unlock(&mmc_host_lock);
 312 }
 313
 314 /*
 315  * Internal function. Free a MMC host.
 316  */
 317 void mmc_free_host_sysfs(struct mmc_host *host)
 318 {
 319         class_device_put(&host->class_dev);
 320 }
 321
 322
 323 static int __init mmc_init(void)
 324 {
 325         int ret = bus_register(&mmc_bus_type);
 326         if (ret == 0) {
 327                 ret = class_register(&mmc_host_class);
 328                 if (ret)
 329                         bus_unregister(&mmc_bus_type);
 330         }
 331         return ret;
 332 }
 333
 334 static void __exit mmc_exit(void)
 335 {
 336         class_unregister(&mmc_host_class);
 337         bus_unregister(&mmc_bus_type);
 338 }
 339
 340 module_init(mmc_init);
 341 module_exit(mmc_exit);