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 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
  27         const struct sdio_device_id *id)
  28 {
  29         if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
  30                 return NULL;
  31         if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
  32                 return NULL;
  33         if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
  34                 return NULL;
  35         return id;
  36 }
  37
  38 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
  39         struct sdio_driver *sdrv)
  40 {
  41         const struct sdio_device_id *ids;
  42
  43         ids = sdrv->id_table;
  44
  45         if (ids) {
  46                 while (ids->class || ids->vendor || ids->device) {
  47                         if (sdio_match_one(func, ids))
  48                                 return ids;
  49                         ids++;
  50                 }
  51         }
  52
  53         return NULL;
  54 }
  55
  56 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
  57 {
  58         struct sdio_func *func = dev_to_sdio_func(dev);
  59         struct sdio_driver *sdrv = to_sdio_driver(drv);
  60
  61         if (sdio_match_device(func, sdrv))
  62                 return 1;
  63
  64         return 0;
  65 }
  66
  67 static int
  68 sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
  69                 int buf_size)
  70 {
  71         struct sdio_func *func = dev_to_sdio_func(dev);
  72         int i = 0, length = 0;
  73
  74         if (add_uevent_var(envp, num_envp, &i,
  75                         buf, buf_size, &length,
  76                         "SDIO_CLASS=%02X", func->class))
  77                 return -ENOMEM;
  78
  79         if (add_uevent_var(envp, num_envp, &i,
  80                         buf, buf_size, &length,
  81                         "SDIO_ID=%04X:%04X", func->vendor, func->device))
  82                 return -ENOMEM;
  83
  84         if (add_uevent_var(envp, num_envp, &i,
  85                         buf, buf_size, &length,
  86                         "MODALIAS=sdio:c%02Xv%04Xd%04X",
  87                         func->class, func->vendor, func->device))
  88                 return -ENOMEM;
  89
  90         envp[i] = NULL;
  91
  92         return 0;
  93 }
  94
  95 static int sdio_bus_probe(struct device *dev)
  96 {
  97         struct sdio_driver *drv = to_sdio_driver(dev->driver);
  98         struct sdio_func *func = dev_to_sdio_func(dev);
  99         const struct sdio_device_id *id;
 100
 101         id = sdio_match_device(func, drv);
 102         if (!id)
 103                 return -ENODEV;
 104
 105         return drv->probe(func, id);
 106 }
 107
 108 static int sdio_bus_remove(struct device *dev)
 109 {
 110         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 111         struct sdio_func *func = dev_to_sdio_func(dev);
 112
 113         drv->remove(func);
 114
 115         return 0;
 116 }
 117
 118 static struct bus_type sdio_bus_type = {
 119         .name           = "sdio",
 120         .match          = sdio_bus_match,
 121         .uevent         = sdio_bus_uevent,
 122         .probe          = sdio_bus_probe,
 123         .remove         = sdio_bus_remove,
 124 };
 125
 126 int sdio_register_bus(void)
 127 {
 128         return bus_register(&sdio_bus_type);
 129 }
 130
 131 void sdio_unregister_bus(void)
 132 {
 133         bus_unregister(&sdio_bus_type);
 134 }
 135
 136 /**
 137  *      sdio_register_driver - register a function driver
 138  *      @drv: SDIO function driver
 139  */
 140 int sdio_register_driver(struct sdio_driver *drv)
 141 {
 142         drv->drv.name = drv->name;
 143         drv->drv.bus = &sdio_bus_type;
 144         return driver_register(&drv->drv);
 145 }
 146 EXPORT_SYMBOL_GPL(sdio_register_driver);
 147
 148 /**
 149  *      sdio_unregister_driver - unregister a function driver
 150  *      @drv: SDIO function driver
 151  */
 152 void sdio_unregister_driver(struct sdio_driver *drv)
 153 {
 154         drv->drv.bus = &sdio_bus_type;
 155         driver_unregister(&drv->drv);
 156 }
 157 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
 158
 159 static void sdio_release_func(struct device *dev)
 160 {
 161         struct sdio_func *func = dev_to_sdio_func(dev);
 162
 163         sdio_free_func_cis(func);
 164
 165         kfree(func);
 166 }
 167
 168 /*
 169  * Allocate and initialise a new SDIO function structure.
 170  */
 171 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 172 {
 173         struct sdio_func *func;
 174
 175         func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
 176         if (!func)
 177                 return ERR_PTR(-ENOMEM);
 178
 179         memset(func, 0, sizeof(struct sdio_func));
 180
 181         func->card = card;
 182
 183         device_initialize(&func->dev);
 184
 185         func->dev.parent = &card->dev;
 186         func->dev.bus = &sdio_bus_type;
 187         func->dev.release = sdio_release_func;
 188
 189         return func;
 190 }
 191
 192 /*
 193  * Register a new SDIO function with the driver model.
 194  */
 195 int sdio_add_func(struct sdio_func *func)
 196 {
 197         int ret;
 198
 199         snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
 200                  "%s:%d", mmc_card_id(func->card), func->num);
 201
 202         ret = device_add(&func->dev);
 203         if (ret == 0)
 204                 sdio_func_set_present(func);
 205
 206         return ret;
 207 }
 208
 209 /*
 210  * Unregister a SDIO function with the driver model, and
 211  * (eventually) free it.
 212  */
 213 void sdio_remove_func(struct sdio_func *func)
 214 {
 215         if (sdio_func_present(func))
 216                 device_del(&func->dev);
 217
 218         put_device(&func->dev);
 219 }
 220