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_uevent(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 int mmc_bus_probe(struct device *dev)
 140 {
 141         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 142         struct mmc_card *card = dev_to_mmc_card(dev);
 143
 144         return drv->probe(card);
 145 }
 146
 147 static int mmc_bus_remove(struct device *dev)
 148 {
 149         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 150         struct mmc_card *card = dev_to_mmc_card(dev);
 151
 152         drv->remove(card);
 153
 154         return 0;
 155 }
 156
 157 static struct bus_type mmc_bus_type = {
 158         .name           = "mmc",
 159         .dev_attrs      = mmc_dev_attrs,
 160         .match          = mmc_bus_match,
 161         .uevent         = mmc_bus_uevent,
 162         .probe          = mmc_bus_probe,
 163         .remove         = mmc_bus_remove,
 164         .suspend        = mmc_bus_suspend,
 165         .resume         = mmc_bus_resume,
 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         return driver_register(&drv->drv);
 176 }
 177
 178 EXPORT_SYMBOL(mmc_register_driver);
 179
 180 /**
 181  *      mmc_unregister_driver - unregister a media driver
 182  *      @drv: MMC media driver
 183  */
 184 void mmc_unregister_driver(struct mmc_driver *drv)
 185 {
 186         drv->drv.bus = &mmc_bus_type;
 187         driver_unregister(&drv->drv);
 188 }
 189
 190 EXPORT_SYMBOL(mmc_unregister_driver);
 191
 192
 193 /*
 194  * Internal function.  Initialise a MMC card structure.
 195  */
 196 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
 197 {
 198         memset(card, 0, sizeof(struct mmc_card));
 199         card->host = host;
 200         device_initialize(&card->dev);
 201         card->dev.parent = card->host->dev;
 202         card->dev.bus = &mmc_bus_type;
 203         card->dev.release = mmc_release_card;
 204 }
 205
 206 /*
 207  * Internal function.  Register a new MMC card with the driver model.
 208  */
 209 int mmc_register_card(struct mmc_card *card)
 210 {
 211         int ret;
 212
 213         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 214                  "%s:%04x", mmc_hostname(card->host), card->rca);
 215
 216         ret = device_add(&card->dev);
 217         if (ret == 0) {
 218                 if (mmc_card_sd(card)) {
 219                         ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
 220                         if (ret)
 221                                 device_del(&card->dev);
 222                 }
 223         }
 224         return ret;
 225 }
 226
 227 /*
 228  * Internal function.  Unregister a new MMC card with the
 229  * driver model, and (eventually) free it.
 230  */
 231 void mmc_remove_card(struct mmc_card *card)
 232 {
 233         if (mmc_card_present(card)) {
 234                 if (mmc_card_sd(card))
 235                         device_remove_file(&card->dev, &mmc_dev_attr_scr);
 236
 237                 device_del(&card->dev);
 238         }
 239
 240         put_device(&card->dev);
 241 }
 242
 243
 244 static void mmc_host_classdev_release(struct class_device *dev)
 245 {
 246         struct mmc_host *host = cls_dev_to_mmc_host(dev);
 247         kfree(host);
 248 }
 249
 250 static struct class mmc_host_class = {
 251         .name           = "mmc_host",
 252         .release        = mmc_host_classdev_release,
 253 };
 254
 255 static DEFINE_IDR(mmc_host_idr);
 256 static DEFINE_SPINLOCK(mmc_host_lock);
 257
 258 /*
 259  * Internal function. Allocate a new MMC host.
 260  */
 261 struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
 262 {
 263         struct mmc_host *host;
 264
 265         host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
 266         if (host) {
 267                 memset(host, 0, sizeof(struct mmc_host) + extra);
 268
 269                 host->dev = dev;
 270                 host->class_dev.dev = host->dev;
 271                 host->class_dev.class = &mmc_host_class;
 272                 class_device_initialize(&host->class_dev);
 273         }
 274
 275         return host;
 276 }
 277
 278 /*
 279  * Internal function. Register a new MMC host with the MMC class.
 280  */
 281 int mmc_add_host_sysfs(struct mmc_host *host)
 282 {
 283         int err;
 284
 285         if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
 286                 return -ENOMEM;
 287
 288         spin_lock(&mmc_host_lock);
 289         err = idr_get_new(&mmc_host_idr, host, &host->index);
 290         spin_unlock(&mmc_host_lock);
 291         if (err)
 292                 return err;
 293
 294         snprintf(host->class_dev.class_id, BUS_ID_SIZE,
 295                  "mmc%d", host->index);
 296
 297         return class_device_add(&host->class_dev);
 298 }
 299
 300 /*
 301  * Internal function. Unregister a MMC host with the MMC class.
 302  */
 303 void mmc_remove_host_sysfs(struct mmc_host *host)
 304 {
 305         class_device_del(&host->class_dev);
 306
 307         spin_lock(&mmc_host_lock);
 308         idr_remove(&mmc_host_idr, host->index);
 309         spin_unlock(&mmc_host_lock);
 310 }
 311
 312 /*
 313  * Internal function. Free a MMC host.
 314  */
 315 void mmc_free_host_sysfs(struct mmc_host *host)
 316 {
 317         class_device_put(&host->class_dev);
 318 }
 319
 320
 321 static int __init mmc_init(void)
 322 {
 323         int ret = bus_register(&mmc_bus_type);
 324         if (ret == 0) {
 325                 ret = class_register(&mmc_host_class);
 326                 if (ret)
 327                         bus_unregister(&mmc_bus_type);
 328         }
 329         return ret;
 330 }
 331
 332 static void __exit mmc_exit(void)
 333 {
 334         class_unregister(&mmc_host_class);
 335         bus_unregister(&mmc_bus_type);
 336 }
 337
 338 module_init(mmc_init);
 339 module_exit(mmc_exit);