drivers/mmc/core/sdio_bus.c

   1 /*
   2  *  linux/drivers/mmc/core/sdio_bus.c
   3  *
   4  *  Copyright 2007 Pierre Ossman
   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 as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  * SDIO function driver model
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/err.h>
  16 #include <linux/slab.h>
  17
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/sdio_func.h>
  20
  21 #include "sdio_cis.h"
  22 #include "sdio_bus.h"
  23
  24 /* show configuration fields */
  25 #define sdio_config_attr(field, format_string)                          \
  26 static ssize_t                                                          \
  27 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  28 {                                                                       \
  29         struct sdio_func *func;                                         \
  30                                                                         \
  31         func = dev_to_sdio_func (dev);                                  \
  32         return sprintf (buf, format_string, func->field);               \
  33 }
  34
  35 sdio_config_attr(class, "0x%02x\n");
  36 sdio_config_attr(vendor, "0x%04x\n");
  37 sdio_config_attr(device, "0x%04x\n");
  38
  39 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
  40 {
  41         struct sdio_func *func = dev_to_sdio_func (dev);
  42
  43         return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
  44                         func->class, func->vendor, func->device);
  45 }
  46
  47 static struct device_attribute sdio_dev_attrs[] = {
  48         __ATTR_RO(class),
  49         __ATTR_RO(vendor),
  50         __ATTR_RO(device),
  51         __ATTR_RO(modalias),
  52         __ATTR_NULL,
  53 };
  54
  55 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
  56         const struct sdio_device_id *id)
  57 {
  58         if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
  59                 return NULL;
  60         if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
  61                 return NULL;
  62         if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
  63                 return NULL;
  64         return id;
  65 }
  66
  67 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
  68         struct sdio_driver *sdrv)
  69 {
  70         const struct sdio_device_id *ids;
  71
  72         ids = sdrv->id_table;
  73
  74         if (ids) {
  75                 while (ids->class || ids->vendor || ids->device) {
  76                         if (sdio_match_one(func, ids))
  77                                 return ids;
  78                         ids++;
  79                 }
  80         }
  81
  82         return NULL;
  83 }
  84
  85 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
  86 {
  87         struct sdio_func *func = dev_to_sdio_func(dev);
  88         struct sdio_driver *sdrv = to_sdio_driver(drv);
  89
  90         if (sdio_match_device(func, sdrv))
  91                 return 1;
  92
  93         return 0;
  94 }
  95
  96 static int
  97 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
  98 {
  99         struct sdio_func *func = dev_to_sdio_func(dev);
 100
 101         if (add_uevent_var(env,
 102                         "SDIO_CLASS=%02X", func->class))
 103                 return -ENOMEM;
 104
 105         if (add_uevent_var(env,
 106                         "SDIO_ID=%04X:%04X", func->vendor, func->device))
 107                 return -ENOMEM;
 108
 109         if (add_uevent_var(env,
 110                         "MODALIAS=sdio:c%02Xv%04Xd%04X",
 111                         func->class, func->vendor, func->device))
 112                 return -ENOMEM;
 113
 114         return 0;
 115 }
 116
 117 static int sdio_bus_probe(struct device *dev)
 118 {
 119         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 120         struct sdio_func *func = dev_to_sdio_func(dev);
 121         const struct sdio_device_id *id;
 122         int ret;
 123
 124         id = sdio_match_device(func, drv);
 125         if (!id)
 126                 return -ENODEV;
 127
 128         /* Set the default block size so the driver is sure it's something
 129          * sensible. */
 130         sdio_claim_host(func);
 131         ret = sdio_set_block_size(func, 0);
 132         sdio_release_host(func);
 133         if (ret)
 134                 return ret;
 135
 136         return drv->probe(func, id);
 137 }
 138
 139 static int sdio_bus_remove(struct device *dev)
 140 {
 141         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 142         struct sdio_func *func = dev_to_sdio_func(dev);
 143
 144         drv->remove(func);
 145
 146         if (func->irq_handler) {
 147                 printk(KERN_WARNING "WARNING: driver %s did not remove "
 148                         "its interrupt handler!\n", drv->name);
 149                 sdio_claim_host(func);
 150                 sdio_release_irq(func);
 151                 sdio_release_host(func);
 152         }
 153
 154         return 0;
 155 }
 156
 157 static struct bus_type sdio_bus_type = {
 158         .name           = "sdio",
 159         .dev_attrs      = sdio_dev_attrs,
 160         .match          = sdio_bus_match,
 161         .uevent         = sdio_bus_uevent,
 162         .probe          = sdio_bus_probe,
 163         .remove         = sdio_bus_remove,
 164 };
 165
 166 int sdio_register_bus(void)
 167 {
 168         return bus_register(&sdio_bus_type);
 169 }
 170
 171 void sdio_unregister_bus(void)
 172 {
 173         bus_unregister(&sdio_bus_type);
 174 }
 175
 176 /**
 177  *      sdio_register_driver - register a function driver
 178  *      @drv: SDIO function driver
 179  */
 180 int sdio_register_driver(struct sdio_driver *drv)
 181 {
 182         drv->drv.name = drv->name;
 183         drv->drv.bus = &sdio_bus_type;
 184         return driver_register(&drv->drv);
 185 }
 186 EXPORT_SYMBOL_GPL(sdio_register_driver);
 187
 188 /**
 189  *      sdio_unregister_driver - unregister a function driver
 190  *      @drv: SDIO function driver
 191  */
 192 void sdio_unregister_driver(struct sdio_driver *drv)
 193 {
 194         drv->drv.bus = &sdio_bus_type;
 195         driver_unregister(&drv->drv);
 196 }
 197 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
 198
 199 static void sdio_release_func(struct device *dev)
 200 {
 201         struct sdio_func *func = dev_to_sdio_func(dev);
 202
 203         sdio_free_func_cis(func);
 204
 205         if (func->info)
 206                 kfree(func->info);
 207
 208         kfree(func);
 209 }
 210
 211 /*
 212  * Allocate and initialise a new SDIO function structure.
 213  */
 214 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 215 {
 216         struct sdio_func *func;
 217
 218         func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
 219         if (!func)
 220                 return ERR_PTR(-ENOMEM);
 221
 222         func->card = card;
 223
 224         device_initialize(&func->dev);
 225
 226         func->dev.parent = &card->dev;
 227         func->dev.bus = &sdio_bus_type;
 228         func->dev.release = sdio_release_func;
 229
 230         return func;
 231 }
 232
 233 /*
 234  * Register a new SDIO function with the driver model.
 235  */
 236 int sdio_add_func(struct sdio_func *func)
 237 {
 238         int ret;
 239
 240         dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
 241
 242         ret = device_add(&func->dev);
 243         if (ret == 0)
 244                 sdio_func_set_present(func);
 245
 246         return ret;
 247 }
 248
 249 /*
 250  * Unregister a SDIO function with the driver model, and
 251  * (eventually) free it.
 252  * This function can be called through error paths where sdio_add_func() was
 253  * never executed (because a failure occurred at an earlier point).
 254  */
 255 void sdio_remove_func(struct sdio_func *func)
 256 {
 257         if (!sdio_func_present(func))
 258                 return;
 259
 260         device_del(&func->dev);
 261         put_device(&func->dev);
 262 }
 263