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 #include <linux/workqueue.h>
  17
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/host.h>
  20
  21 #include "mmc.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 i = 0;
  90
  91 #define add_env(fmt,val)                                                \
  92         ({                                                              \
  93                 int len, ret = -ENOMEM;                                 \
  94                 if (i < num_envp) {                                     \
  95                         envp[i++] = buf;                                \
  96                         len = snprintf(buf, buf_size, fmt, val) + 1;    \
  97                         buf_size -= len;                                \
  98                         buf += len;                                     \
  99                         if (buf_size >= 0)                              \
 100                                 ret = 0;                                \
 101                 }                                                       \
 102                 ret;                                                    \
 103         })
 104
 105         for (i = 0; i < 12; i++)
 106                 ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
 107         ccc[12] = '\0';
 108
 109         i = 0;
 110         add_env("MMC_CCC=%s", ccc);
 111         add_env("MMC_MANFID=%06x", card->cid.manfid);
 112         add_env("MMC_NAME=%s", mmc_card_name(card));
 113         add_env("MMC_OEMID=%04x", card->cid.oemid);
 114
 115         return 0;
 116 }
 117
 118 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 119 {
 120         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 121         struct mmc_card *card = dev_to_mmc_card(dev);
 122         int ret = 0;
 123
 124         if (dev->driver && drv->suspend)
 125                 ret = drv->suspend(card, state);
 126         return ret;
 127 }
 128
 129 static int mmc_bus_resume(struct device *dev)
 130 {
 131         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 132         struct mmc_card *card = dev_to_mmc_card(dev);
 133         int ret = 0;
 134
 135         if (dev->driver && drv->resume)
 136                 ret = drv->resume(card);
 137         return ret;
 138 }
 139
 140 static int mmc_bus_probe(struct device *dev)
 141 {
 142         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 143         struct mmc_card *card = dev_to_mmc_card(dev);
 144
 145         return drv->probe(card);
 146 }
 147
 148 static int mmc_bus_remove(struct device *dev)
 149 {
 150         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 151         struct mmc_card *card = dev_to_mmc_card(dev);
 152
 153         drv->remove(card);
 154
 155         return 0;
 156 }
 157
 158 static struct bus_type mmc_bus_type = {
 159         .name           = "mmc",
 160         .dev_attrs      = mmc_dev_attrs,
 161         .match          = mmc_bus_match,
 162         .uevent         = mmc_bus_uevent,
 163         .probe          = mmc_bus_probe,
 164         .remove         = mmc_bus_remove,
 165         .suspend        = mmc_bus_suspend,
 166         .resume         = mmc_bus_resume,
 167 };
 168
 169 /**
 170  *      mmc_register_driver - register a media driver
 171  *      @drv: MMC media driver
 172  */
 173 int mmc_register_driver(struct mmc_driver *drv)
 174 {
 175         drv->drv.bus = &mmc_bus_type;
 176         return driver_register(&drv->drv);
 177 }
 178
 179 EXPORT_SYMBOL(mmc_register_driver);
 180
 181 /**
 182  *      mmc_unregister_driver - unregister a media driver
 183  *      @drv: MMC media driver
 184  */
 185 void mmc_unregister_driver(struct mmc_driver *drv)
 186 {
 187         drv->drv.bus = &mmc_bus_type;
 188         driver_unregister(&drv->drv);
 189 }
 190
 191 EXPORT_SYMBOL(mmc_unregister_driver);
 192
 193
 194 /*
 195  * Internal function.  Initialise a MMC card structure.
 196  */
 197 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
 198 {
 199         memset(card, 0, sizeof(struct mmc_card));
 200         card->host = host;
 201         device_initialize(&card->dev);
 202         card->dev.parent = mmc_classdev(host);
 203         card->dev.bus = &mmc_bus_type;
 204         card->dev.release = mmc_release_card;
 205 }
 206
 207 /*
 208  * Internal function.  Register a new MMC card with the driver model.
 209  */
 210 int mmc_register_card(struct mmc_card *card)
 211 {
 212         int ret;
 213
 214         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 215                  "%s:%04x", mmc_hostname(card->host), card->rca);
 216
 217         ret = device_add(&card->dev);
 218         if (ret == 0) {
 219                 if (mmc_card_sd(card)) {
 220                         ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
 221                         if (ret)
 222                                 device_del(&card->dev);
 223                 }
 224         }
 225         return ret;
 226 }
 227
 228 /*
 229  * Internal function.  Unregister a new MMC card with the
 230  * driver model, and (eventually) free it.
 231  */
 232 void mmc_remove_card(struct mmc_card *card)
 233 {
 234         if (mmc_card_present(card)) {
 235                 if (mmc_card_sd(card))
 236                         device_remove_file(&card->dev, &mmc_dev_attr_scr);
 237
 238                 device_del(&card->dev);
 239         }
 240
 241         put_device(&card->dev);
 242 }
 243
 244
 245 static void mmc_host_classdev_release(struct device *dev)
 246 {
 247         struct mmc_host *host = cls_dev_to_mmc_host(dev);
 248         kfree(host);
 249 }
 250
 251 static struct class mmc_host_class = {
 252         .name           = "mmc_host",
 253         .dev_release    = mmc_host_classdev_release,
 254 };
 255
 256 static DEFINE_IDR(mmc_host_idr);
 257 static DEFINE_SPINLOCK(mmc_host_lock);
 258
 259 /*
 260  * Internal function. Allocate a new MMC host.
 261  */
 262 struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
 263 {
 264         struct mmc_host *host;
 265
 266         host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
 267         if (host) {
 268                 memset(host, 0, sizeof(struct mmc_host) + extra);
 269
 270                 host->parent = dev;
 271                 host->class_dev.parent = dev;
 272                 host->class_dev.class = &mmc_host_class;
 273                 device_initialize(&host->class_dev);
 274         }
 275
 276         return host;
 277 }
 278
 279 /*
 280  * Internal function. Register a new MMC host with the MMC class.
 281  */
 282 int mmc_add_host_sysfs(struct mmc_host *host)
 283 {
 284         int err;
 285
 286         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
 287                 return -ENOMEM;
 288
 289         spin_lock(&mmc_host_lock);
 290         err = idr_get_new(&mmc_host_idr, host, &host->index);
 291         spin_unlock(&mmc_host_lock);
 292         if (err)
 293                 return err;
 294
 295         snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
 296                  "mmc%d", host->index);
 297
 298         return device_add(&host->class_dev);
 299 }
 300
 301 /*
 302  * Internal function. Unregister a MMC host with the MMC class.
 303  */
 304 void mmc_remove_host_sysfs(struct mmc_host *host)
 305 {
 306         device_del(&host->class_dev);
 307
 308         spin_lock(&mmc_host_lock);
 309         idr_remove(&mmc_host_idr, host->index);
 310         spin_unlock(&mmc_host_lock);
 311 }
 312
 313 /*
 314  * Internal function. Free a MMC host.
 315  */
 316 void mmc_free_host_sysfs(struct mmc_host *host)
 317 {
 318         put_device(&host->class_dev);
 319 }
 320
 321 static struct workqueue_struct *workqueue;
 322
 323 /*
 324  * Internal function. Schedule delayed work in the MMC work queue.
 325  */
 326 int mmc_schedule_delayed_work(struct delayed_work *work, unsigned long delay)
 327 {
 328         return queue_delayed_work(workqueue, work, delay);
 329 }
 330
 331 /*
 332  * Internal function. Flush all scheduled work from the MMC work queue.
 333  */
 334 void mmc_flush_scheduled_work(void)
 335 {
 336         flush_workqueue(workqueue);
 337 }
 338
 339 static int __init mmc_init(void)
 340 {
 341         int ret;
 342
 343         workqueue = create_singlethread_workqueue("kmmcd");
 344         if (!workqueue)
 345                 return -ENOMEM;
 346
 347         ret = bus_register(&mmc_bus_type);
 348         if (ret == 0) {
 349                 ret = class_register(&mmc_host_class);
 350                 if (ret)
 351                         bus_unregister(&mmc_bus_type);
 352         }
 353         return ret;
 354 }
 355
 356 static void __exit mmc_exit(void)
 357 {
 358         class_unregister(&mmc_host_class);
 359         bus_unregister(&mmc_bus_type);
 360         destroy_workqueue(workqueue);
 361 }
 362
 363 module_init(mmc_init);
 364 module_exit(mmc_exit);