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
  16 #include <linux/mmc/card.h>
  17 #include <linux/mmc/host.h>
  18
  19 #include "mmc.h"
  20
  21 #define dev_to_mmc_card(d)      container_of(d, struct mmc_card, dev)
  22 #define to_mmc_driver(d)        container_of(d, struct mmc_driver, drv)
  23
  24 #define MMC_ATTR(name, fmt, args...)                                    \
  25 static ssize_t mmc_##name##_show (struct device *dev, char *buf)        \
  26 {                                                                       \
  27         struct mmc_card *card = dev_to_mmc_card(dev);                   \
  28         return sprintf(buf, fmt, args);                                 \
  29 }
  30
  31 MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
  32         card->raw_cid[2], card->raw_cid[3]);
  33 MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
  34         card->raw_csd[2], card->raw_csd[3]);
  35 MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
  36 MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
  37 MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
  38 MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
  39 MMC_ATTR(name, "%s\n", card->cid.prod_name);
  40 MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
  41 MMC_ATTR(serial, "0x%08x\n", card->cid.serial);
  42
  43 #define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
  44
  45 static struct device_attribute mmc_dev_attrs[] = {
  46         MMC_ATTR_RO(cid),
  47         MMC_ATTR_RO(csd),
  48         MMC_ATTR_RO(date),
  49         MMC_ATTR_RO(fwrev),
  50         MMC_ATTR_RO(hwrev),
  51         MMC_ATTR_RO(manfid),
  52         MMC_ATTR_RO(name),
  53         MMC_ATTR_RO(oemid),
  54         MMC_ATTR_RO(serial),
  55         __ATTR_NULL
  56 };
  57
  58
  59 static void mmc_release_card(struct device *dev)
  60 {
  61         struct mmc_card *card = dev_to_mmc_card(dev);
  62
  63         kfree(card);
  64 }
  65
  66 /*
  67  * This currently matches any MMC driver to any MMC card - drivers
  68  * themselves make the decision whether to drive this card in their
  69  * probe method.  However, we force "bad" cards to fail.
  70  */
  71 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
  72 {
  73         struct mmc_card *card = dev_to_mmc_card(dev);
  74         return !mmc_card_bad(card);
  75 }
  76
  77 static int
  78 mmc_bus_hotplug(struct device *dev, char **envp, int num_envp, char *buf,
  79                 int buf_size)
  80 {
  81         struct mmc_card *card = dev_to_mmc_card(dev);
  82         char ccc[13];
  83         int i = 0;
  84
  85 #define add_env(fmt,val)                                                \
  86         ({                                                              \
  87                 int len, ret = -ENOMEM;                                 \
  88                 if (i < num_envp) {                                     \
  89                         envp[i++] = buf;                                \
  90                         len = snprintf(buf, buf_size, fmt, val) + 1;    \
  91                         buf_size -= len;                                \
  92                         buf += len;                                     \
  93                         if (buf_size >= 0)                              \
  94                                 ret = 0;                                \
  95                 }                                                       \
  96                 ret;                                                    \
  97         })
  98
  99         for (i = 0; i < 12; i++)
 100                 ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
 101         ccc[12] = '\0';
 102
 103         i = 0;
 104         add_env("MMC_CCC=%s", ccc);
 105         add_env("MMC_MANFID=%06x", card->cid.manfid);
 106         add_env("MMC_NAME=%s", mmc_card_name(card));
 107         add_env("MMC_OEMID=%04x", card->cid.oemid);
 108
 109         return 0;
 110 }
 111
 112 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
 113 {
 114         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 115         struct mmc_card *card = dev_to_mmc_card(dev);
 116         int ret = 0;
 117
 118         if (dev->driver && drv->suspend)
 119                 ret = drv->suspend(card, state);
 120         return ret;
 121 }
 122
 123 static int mmc_bus_resume(struct device *dev)
 124 {
 125         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 126         struct mmc_card *card = dev_to_mmc_card(dev);
 127         int ret = 0;
 128
 129         if (dev->driver && drv->resume)
 130                 ret = drv->resume(card);
 131         return ret;
 132 }
 133
 134 static struct bus_type mmc_bus_type = {
 135         .name           = "mmc",
 136         .dev_attrs      = mmc_dev_attrs,
 137         .match          = mmc_bus_match,
 138         .hotplug        = mmc_bus_hotplug,
 139         .suspend        = mmc_bus_suspend,
 140         .resume         = mmc_bus_resume,
 141 };
 142
 143
 144 static int mmc_drv_probe(struct device *dev)
 145 {
 146         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 147         struct mmc_card *card = dev_to_mmc_card(dev);
 148
 149         return drv->probe(card);
 150 }
 151
 152 static int mmc_drv_remove(struct device *dev)
 153 {
 154         struct mmc_driver *drv = to_mmc_driver(dev->driver);
 155         struct mmc_card *card = dev_to_mmc_card(dev);
 156
 157         drv->remove(card);
 158
 159         return 0;
 160 }
 161
 162
 163 /**
 164  *      mmc_register_driver - register a media driver
 165  *      @drv: MMC media driver
 166  */
 167 int mmc_register_driver(struct mmc_driver *drv)
 168 {
 169         drv->drv.bus = &mmc_bus_type;
 170         drv->drv.probe = mmc_drv_probe;
 171         drv->drv.remove = mmc_drv_remove;
 172         return driver_register(&drv->drv);
 173 }
 174
 175 EXPORT_SYMBOL(mmc_register_driver);
 176
 177 /**
 178  *      mmc_unregister_driver - unregister a media driver
 179  *      @drv: MMC media driver
 180  */
 181 void mmc_unregister_driver(struct mmc_driver *drv)
 182 {
 183         drv->drv.bus = &mmc_bus_type;
 184         driver_unregister(&drv->drv);
 185 }
 186
 187 EXPORT_SYMBOL(mmc_unregister_driver);
 188
 189
 190 /*
 191  * Internal function.  Initialise a MMC card structure.
 192  */
 193 void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
 194 {
 195         memset(card, 0, sizeof(struct mmc_card));
 196         card->host = host;
 197         device_initialize(&card->dev);
 198         card->dev.parent = card->host->dev;
 199         card->dev.bus = &mmc_bus_type;
 200         card->dev.release = mmc_release_card;
 201 }
 202
 203 /*
 204  * Internal function.  Register a new MMC card with the driver model.
 205  */
 206 int mmc_register_card(struct mmc_card *card)
 207 {
 208         snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
 209                  "%s:%04x", card->host->host_name, card->rca);
 210
 211         return device_add(&card->dev);
 212 }
 213
 214 /*
 215  * Internal function.  Unregister a new MMC card with the
 216  * driver model, and (eventually) free it.
 217  */
 218 void mmc_remove_card(struct mmc_card *card)
 219 {
 220         if (mmc_card_present(card))
 221                 device_del(&card->dev);
 222
 223         put_device(&card->dev);
 224 }
 225
 226
 227 static int __init mmc_init(void)
 228 {
 229         return bus_register(&mmc_bus_type);
 230 }
 231
 232 static void __exit mmc_exit(void)
 233 {
 234         bus_unregister(&mmc_bus_type);
 235 }
 236
 237 module_init(mmc_init);
 238 module_exit(mmc_exit);