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
 132         id = sdio_match_device(func, drv);
 133         if (!id)
 134                 return -ENODEV;
 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         kfree(func);
 206 }
 207
 208 /*
 209  * Allocate and initialise a new SDIO function structure.
 210  */
 211 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 212 {
 213         struct sdio_func *func;
 214
 215         func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
 216         if (!func)
 217                 return ERR_PTR(-ENOMEM);
 218
 219         memset(func, 0, sizeof(struct sdio_func));
 220
 221         func->card = card;
 222
 223         device_initialize(&func->dev);
 224
 225         func->dev.parent = &card->dev;
 226         func->dev.bus = &sdio_bus_type;
 227         func->dev.release = sdio_release_func;
 228
 229         return func;
 230 }
 231
 232 /*
 233  * Register a new SDIO function with the driver model.
 234  */
 235 int sdio_add_func(struct sdio_func *func)
 236 {
 237         int ret;
 238
 239         snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
 240                  "%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  */
 253 void sdio_remove_func(struct sdio_func *func)
 254 {
 255         if (sdio_func_present(func))
 256                 device_del(&func->dev);
 257
 258         put_device(&func->dev);
 259 }
 260