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
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/sdio_func.h>
  19
  20 #include "sdio_cis.h"
  21 #include "sdio_bus.h"
  22
  23 #define dev_to_sdio_func(d)     container_of(d, struct sdio_func, dev)
  24 #define to_sdio_driver(d)      container_of(d, struct sdio_driver, drv)
  25
  26 /* show configuration fields */
  27 #define sdio_config_attr(field, format_string)                          \
  28 static ssize_t                                                          \
  29 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  30 {                                                                       \
  31         struct sdio_func *func;                                         \
  32                                                                         \
  33         func = dev_to_sdio_func (dev);                                  \
  34         return sprintf (buf, format_string, func->field);               \
  35 }
  36
  37 sdio_config_attr(class, "0x%02x\n");
  38 sdio_config_attr(vendor, "0x%04x\n");
  39 sdio_config_attr(device, "0x%04x\n");
  40
  41 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
  42 {
  43         struct sdio_func *func = dev_to_sdio_func (dev);
  44
  45         return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
  46                         func->class, func->vendor, func->device);
  47 }
  48
  49 static struct device_attribute sdio_dev_attrs[] = {
  50         __ATTR_RO(class),
  51         __ATTR_RO(vendor),
  52         __ATTR_RO(device),
  53         __ATTR_RO(modalias),
  54         __ATTR_NULL,
  55 };
  56
  57 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
  58         const struct sdio_device_id *id)
  59 {
  60         if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
  61                 return NULL;
  62         if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
  63                 return NULL;
  64         if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
  65                 return NULL;
  66         return id;
  67 }
  68
  69 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
  70         struct sdio_driver *sdrv)
  71 {
  72         const struct sdio_device_id *ids;
  73
  74         ids = sdrv->id_table;
  75
  76         if (ids) {
  77                 while (ids->class || ids->vendor || ids->device) {
  78                         if (sdio_match_one(func, ids))
  79                                 return ids;
  80                         ids++;
  81                 }
  82         }
  83
  84         return NULL;
  85 }
  86
  87 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
  88 {
  89         struct sdio_func *func = dev_to_sdio_func(dev);
  90         struct sdio_driver *sdrv = to_sdio_driver(drv);
  91
  92         if (sdio_match_device(func, sdrv))
  93                 return 1;
  94
  95         return 0;
  96 }
  97
  98 static int
  99 sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
 100                 int buf_size)
 101 {
 102         struct sdio_func *func = dev_to_sdio_func(dev);
 103         int i = 0, length = 0;
 104
 105         if (add_uevent_var(envp, num_envp, &i,
 106                         buf, buf_size, &length,
 107                         "SDIO_CLASS=%02X", func->class))
 108                 return -ENOMEM;
 109
 110         if (add_uevent_var(envp, num_envp, &i,
 111                         buf, buf_size, &length,
 112                         "SDIO_ID=%04X:%04X", func->vendor, func->device))
 113                 return -ENOMEM;
 114
 115         if (add_uevent_var(envp, num_envp, &i,
 116                         buf, buf_size, &length,
 117                         "MODALIAS=sdio:c%02Xv%04Xd%04X",
 118                         func->class, func->vendor, func->device))
 119                 return -ENOMEM;
 120
 121         envp[i] = NULL;
 122
 123         return 0;
 124 }
 125
 126 static int sdio_bus_probe(struct device *dev)
 127 {
 128         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 129         struct sdio_func *func = dev_to_sdio_func(dev);
 130         const struct sdio_device_id *id;
 131         int ret;
 132
 133         id = sdio_match_device(func, drv);
 134         if (!id)
 135                 return -ENODEV;
 136
 137         /* Set the default block size so the driver is sure it's something
 138          * sensible. */
 139         sdio_claim_host(func);
 140         ret = sdio_set_block_size(func, 0);
 141         sdio_release_host(func);
 142         if (ret)
 143                 return ret;
 144
 145         return drv->probe(func, id);
 146 }
 147
 148 static int sdio_bus_remove(struct device *dev)
 149 {
 150         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 151         struct sdio_func *func = dev_to_sdio_func(dev);
 152
 153         drv->remove(func);
 154
 155         if (func->irq_handler) {
 156                 printk(KERN_WARNING "WARNING: driver %s did not remove "
 157                         "its interrupt handler!\n", drv->name);
 158                 sdio_claim_host(func);
 159                 sdio_release_irq(func);
 160                 sdio_release_host(func);
 161         }
 162
 163         return 0;
 164 }
 165
 166 static struct bus_type sdio_bus_type = {
 167         .name           = "sdio",
 168         .dev_attrs      = sdio_dev_attrs,
 169         .match          = sdio_bus_match,
 170         .uevent         = sdio_bus_uevent,
 171         .probe          = sdio_bus_probe,
 172         .remove         = sdio_bus_remove,
 173 };
 174
 175 int sdio_register_bus(void)
 176 {
 177         return bus_register(&sdio_bus_type);
 178 }
 179
 180 void sdio_unregister_bus(void)
 181 {
 182         bus_unregister(&sdio_bus_type);
 183 }
 184
 185 /**
 186  *      sdio_register_driver - register a function driver
 187  *      @drv: SDIO function driver
 188  */
 189 int sdio_register_driver(struct sdio_driver *drv)
 190 {
 191         drv->drv.name = drv->name;
 192         drv->drv.bus = &sdio_bus_type;
 193         return driver_register(&drv->drv);
 194 }
 195 EXPORT_SYMBOL_GPL(sdio_register_driver);
 196
 197 /**
 198  *      sdio_unregister_driver - unregister a function driver
 199  *      @drv: SDIO function driver
 200  */
 201 void sdio_unregister_driver(struct sdio_driver *drv)
 202 {
 203         drv->drv.bus = &sdio_bus_type;
 204         driver_unregister(&drv->drv);
 205 }
 206 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
 207
 208 static void sdio_release_func(struct device *dev)
 209 {
 210         struct sdio_func *func = dev_to_sdio_func(dev);
 211
 212         sdio_free_func_cis(func);
 213
 214         kfree(func);
 215 }
 216
 217 /*
 218  * Allocate and initialise a new SDIO function structure.
 219  */
 220 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 221 {
 222         struct sdio_func *func;
 223
 224         func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
 225         if (!func)
 226                 return ERR_PTR(-ENOMEM);
 227
 228         memset(func, 0, sizeof(struct sdio_func));
 229
 230         func->card = card;
 231
 232         device_initialize(&func->dev);
 233
 234         func->dev.parent = &card->dev;
 235         func->dev.bus = &sdio_bus_type;
 236         func->dev.release = sdio_release_func;
 237
 238         return func;
 239 }
 240
 241 /*
 242  * Register a new SDIO function with the driver model.
 243  */
 244 int sdio_add_func(struct sdio_func *func)
 245 {
 246         int ret;
 247
 248         snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
 249                  "%s:%d", mmc_card_id(func->card), func->num);
 250
 251         ret = device_add(&func->dev);
 252         if (ret == 0)
 253                 sdio_func_set_present(func);
 254
 255         return ret;
 256 }
 257
 258 /*
 259  * Unregister a SDIO function with the driver model, and
 260  * (eventually) free it.
 261  */
 262 void sdio_remove_func(struct sdio_func *func)
 263 {
 264         if (sdio_func_present(func))
 265                 device_del(&func->dev);
 266
 267         put_device(&func->dev);
 268 }
 269