drivers/mmc/core/sysfs.c

   1 /*
   2  *  linux/drivers/mmc/core/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 #include <linux/workqueue.h>
  17
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/host.h>
  20
  21 #include "sysfs.h"
  22
  23 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
  24 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
  25 #define cls_dev_to_mmc_host(d)  container_of(d, struct mmc_host, class_dev)
  26
  27 #define MMC_ATTR(name, fmt, args...)                                    \
  28 static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf) \
  29 {                                                                       \
  30         struct mmc_card *card = dev_to_mmc_card(dev);                   \
  31         return sprintf(buf, fmt, args);                                 \
  32 }
  33
  34 MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
  35         card->raw_cid[2], card->raw_cid[3]);
  36 MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
  37         card->raw_csd[2], card->raw_csd[3]);
  38 MMC_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
  39 MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
  40 MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
  41 MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
  42 MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
  43 MMC_ATTR(name, "%s\n", card->cid.prod_name);
  44 MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
  45 MMC_ATTR(serial, "0x%08x\n", card->cid.serial);
  46
  47 #define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
  48
  49 static struct device_attribute mmc_dev_attrs[] = {
  50         MMC_ATTR_RO(cid),
  51         MMC_ATTR_RO(csd),
  52         MMC_ATTR_RO(date),
  53         MMC_ATTR_RO(fwrev),
  54         MMC_ATTR_RO(hwrev),
  55         MMC_ATTR_RO(manfid),
  56         MMC_ATTR_RO(name),
  57         MMC_ATTR_RO(oemid),
  58         MMC_ATTR_RO(serial),
  59         __ATTR_NULL
  60 };
  61
  62 static struct device_attribute mmc_dev_attr_scr = MMC_ATTR_RO(scr);
  63
  64
  65 static void mmc_release_card(struct device *dev)
  66 {
  67         struct mmc_card *card = dev_to_mmc_card(dev);
  68
  69         kfree(card);
  70 }
  71
  72 /*
  73  * This currently matches any MMC driver to any MMC card - drivers
  74  * themselves make the decision whether to drive this card in their
  75  * probe method.  However, we force "bad" cards to fail.
  76  */
  77 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  78 {
  79         struct mmc_card *card = dev_to_mmc_card(dev);
  80         return !mmc_card_bad(card);
  81 }
  82
  83 static int
  84 mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
  85                 int buf_size)
  86 {
  87         struct mmc_card *card = dev_to_mmc_card(dev);
  88         char ccc[13];
  89         int retval = 0, i = 0, length = 0;
  90
  91 #define add_env(fmt,val) do {                                   \
  92         retval = add_uevent_var(envp, num_envp, &i,             \
  93                                 buf, buf_size, &length,         \
  94                                 fmt, val);                      \
  95         if (retval)                                             \
  96                 return retval;                                  \
  97 } while (0);
  98
  99         for (i = 0; i < 12; i++)
 100                 ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
 101         ccc[12] = '\0';
 102
 103         add_env("MMC_CCC=%s", ccc);
 104         add_env("MMC_MANFID=%06x", card->cid.manfid);
 105         add_env("MMC_NAME=%s", mmc_card_name(card));
 106         add_env("MMC_OEMID=%04x", card->cid.oemid);
 107 #undef add_env
 108         envp[i] = NULL;
 109
 110         return 0;
 111 }
 112
 113 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 114 {
 115         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 116         struct mmc_card *card = dev_to_mmc_card(dev);
 117         int ret = 0;
 118
 119         if (dev->driver && drv->suspend)
 120                 ret = drv->suspend(card, state);
 121         return ret;
 122 }
 123
 124 static int mmc_bus_resume(struct device *dev)
 125 {
 126         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 127         struct mmc_card *card = dev_to_mmc_card(dev);
 128         int ret = 0;
 129
 130         if (dev->driver && drv->resume)
 131                 ret = drv->resume(card);
 132         return ret;
 133 }
 134
 135 static int mmc_bus_probe(struct device *dev)
 136 {
 137         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 138         struct mmc_card *card = dev_to_mmc_card(dev);
 139
 140         return drv->probe(card);
 141 }
 142
 143 static int mmc_bus_remove(struct device *dev)
 144 {
 145         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 146         struct mmc_card *card = dev_to_mmc_card(dev);
 147
 148         drv->remove(card);
 149
 150         return 0;
 151 }
 152
 153 static struct bus_type mmc_bus_type = {
 154         .name           = "mmc",
 155         .dev_attrs      = mmc_dev_attrs,
 156         .match          = mmc_bus_match,
 157         .uevent         = mmc_bus_uevent,
 158         .probe          = mmc_bus_probe,
 159         .remove         = mmc_bus_remove,
 160         .suspend        = mmc_bus_suspend,
 161         .resume         = mmc_bus_resume,
 162 };
 163
 164 /**
 165  *      mmc_register_driver - register a media driver
 166  *      @drv: MMC media driver
 167  */
 168 int mmc_register_driver(struct mmc_driver *drv)
 169 {
 170         drv->drv.bus = &mmc_bus_type;
 171         return driver_register(&drv->drv);
 172 }
 173
 174 EXPORT_SYMBOL(mmc_register_driver);
 175
 176 /**
 177  *      mmc_unregister_driver - unregister a media driver
 178  *      @drv: MMC media driver
 179  */
 180 void mmc_unregister_driver(struct mmc_driver *drv)
 181 {
 182         drv->drv.bus = &mmc_bus_type;
 183         driver_unregister(&drv->drv);
 184 }
 185
 186 EXPORT_SYMBOL(mmc_unregister_driver);
 187
 188
 189 /*
 190  * Internal function.  Initialise a MMC card structure.
 191  */
 192 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
 193 {
 194         memset(card, 0, sizeof(struct mmc_card));
 195         card->host = host;
 196         device_initialize(&card->dev);
 197         card->dev.parent = mmc_classdev(host);
 198         card->dev.bus = &mmc_bus_type;
 199         card->dev.release = mmc_release_card;
 200 }
 201
 202 /*
 203  * Internal function.  Register a new MMC card with the driver model.
 204  */
 205 int mmc_register_card(struct mmc_card *card)
 206 {
 207         int ret;
 208
 209         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 210                  "%s:%04x", mmc_hostname(card->host), card->rca);
 211
 212         ret = device_add(&card->dev);
 213         if (ret == 0) {
 214                 if (mmc_card_sd(card)) {
 215                         ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
 216                         if (ret)
 217                                 device_del(&card->dev);
 218                 }
 219         }
 220         if (ret == 0)
 221                 mmc_card_set_present(card);
 222         return ret;
 223 }
 224
 225 /*
 226  * Internal function.  Unregister a new MMC card with the
 227  * driver model, and (eventually) free it.
 228  */
 229 void mmc_remove_card(struct mmc_card *card)
 230 {
 231         if (mmc_card_present(card)) {
 232                 if (mmc_card_sd(card))
 233                         device_remove_file(&card->dev, &mmc_dev_attr_scr);
 234
 235                 device_del(&card->dev);
 236         }
 237
 238         put_device(&card->dev);
 239 }
 240
 241
 242 static void mmc_host_classdev_release(struct device *dev)
 243 {
 244         struct mmc_host *host = cls_dev_to_mmc_host(dev);
 245         kfree(host);
 246 }
 247
 248 static struct class mmc_host_class = {
 249         .name           = "mmc_host",
 250         .dev_release    = mmc_host_classdev_release,
 251 };
 252
 253 static DEFINE_IDR(mmc_host_idr);
 254 static DEFINE_SPINLOCK(mmc_host_lock);
 255
 256 /*
 257  * Internal function. Allocate a new MMC host.
 258  */
 259 struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
 260 {
 261         struct mmc_host *host;
 262
 263         host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
 264         if (host) {
 265                 memset(host, 0, sizeof(struct mmc_host) + extra);
 266
 267                 host->parent = dev;
 268                 host->class_dev.parent = dev;
 269                 host->class_dev.class = &mmc_host_class;
 270                 device_initialize(&host->class_dev);
 271         }
 272
 273         return host;
 274 }
 275
 276 /*
 277  * Internal function. Register a new MMC host with the MMC class.
 278  */
 279 int mmc_add_host_sysfs(struct mmc_host *host)
 280 {
 281         int err;
 282
 283         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
 284                 return -ENOMEM;
 285
 286         spin_lock(&mmc_host_lock);
 287         err = idr_get_new(&mmc_host_idr, host, &host->index);
 288         spin_unlock(&mmc_host_lock);
 289         if (err)
 290                 return err;
 291
 292         snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
 293                  "mmc%d", host->index);
 294
 295         return device_add(&host->class_dev);
 296 }
 297
 298 /*
 299  * Internal function. Unregister a MMC host with the MMC class.
 300  */
 301 void mmc_remove_host_sysfs(struct mmc_host *host)
 302 {
 303         device_del(&host->class_dev);
 304
 305         spin_lock(&mmc_host_lock);
 306         idr_remove(&mmc_host_idr, host->index);
 307         spin_unlock(&mmc_host_lock);
 308 }
 309
 310 /*
 311  * Internal function. Free a MMC host.
 312  */
 313 void mmc_free_host_sysfs(struct mmc_host *host)
 314 {
 315         put_device(&host->class_dev);
 316 }
 317
 318 static struct workqueue_struct *workqueue;
 319
 320 /*
 321  * Internal function. Schedule delayed work in the MMC work queue.
 322  */
 323 int mmc_schedule_delayed_work(struct delayed_work *work, unsigned long delay)
 324 {
 325         return queue_delayed_work(workqueue, work, delay);
 326 }
 327
 328 /*
 329  * Internal function. Flush all scheduled work from the MMC work queue.
 330  */
 331 void mmc_flush_scheduled_work(void)
 332 {
 333         flush_workqueue(workqueue);
 334 }
 335
 336 static int __init mmc_init(void)
 337 {
 338         int ret;
 339
 340         workqueue = create_singlethread_workqueue("kmmcd");
 341         if (!workqueue)
 342                 return -ENOMEM;
 343
 344         ret = bus_register(&mmc_bus_type);
 345         if (ret == 0) {
 346                 ret = class_register(&mmc_host_class);
 347                 if (ret)
 348                         bus_unregister(&mmc_bus_type);
 349         }
 350         return ret;
 351 }
 352
 353 static void __exit mmc_exit(void)
 354 {
 355         class_unregister(&mmc_host_class);
 356         bus_unregister(&mmc_bus_type);
 357         destroy_workqueue(workqueue);
 358 }
 359
 360 module_init(mmc_init);
 361 module_exit(mmc_exit);