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 #include <linux/pm_runtime.h>
  18
  19 #include <linux/mmc/card.h>
  20 #include <linux/mmc/host.h>
  21 #include <linux/mmc/sdio_func.h>
  22
  23 #include "sdio_cis.h"
  24 #include "sdio_bus.h"
  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, struct kobj_uevent_env *env)
 100 {
 101         struct sdio_func *func = dev_to_sdio_func(dev);
 102
 103         if (add_uevent_var(env,
 104                         "SDIO_CLASS=%02X", func->class))
 105                 return -ENOMEM;
 106
 107         if (add_uevent_var(env,
 108                         "SDIO_ID=%04X:%04X", func->vendor, func->device))
 109                 return -ENOMEM;
 110
 111         if (add_uevent_var(env,
 112                         "MODALIAS=sdio:c%02Xv%04Xd%04X",
 113                         func->class, func->vendor, func->device))
 114                 return -ENOMEM;
 115
 116         return 0;
 117 }
 118
 119 static int sdio_bus_probe(struct device *dev)
 120 {
 121         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 122         struct sdio_func *func = dev_to_sdio_func(dev);
 123         const struct sdio_device_id *id;
 124         int ret;
 125
 126         id = sdio_match_device(func, drv);
 127         if (!id)
 128                 return -ENODEV;
 129
 130         /* Unbound SDIO functions are always suspended.
 131          * During probe, the function is set active and the usage count
 132          * is incremented.  If the driver supports runtime PM,
 133          * it should call pm_runtime_put_noidle() in its probe routine and
 134          * pm_runtime_get_noresume() in its remove routine.
 135          */
 136         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
 137                 ret = pm_runtime_get_sync(dev);
 138                 if (ret < 0)
 139                         goto out;
 140         }
 141
 142         /* Set the default block size so the driver is sure it's something
 143          * sensible. */
 144         sdio_claim_host(func);
 145         ret = sdio_set_block_size(func, 0);
 146         sdio_release_host(func);
 147         if (ret)
 148                 goto disable_runtimepm;
 149
 150         ret = drv->probe(func, id);
 151         if (ret)
 152                 goto disable_runtimepm;
 153
 154         return 0;
 155
 156 disable_runtimepm:
 157         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 158                 pm_runtime_put_noidle(dev);
 159 out:
 160         return ret;
 161 }
 162
 163 static int sdio_bus_remove(struct device *dev)
 164 {
 165         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 166         struct sdio_func *func = dev_to_sdio_func(dev);
 167         int ret = 0;
 168
 169         /* Make sure card is powered before invoking ->remove() */
 170         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
 171                 ret = pm_runtime_get_sync(dev);
 172                 if (ret < 0)
 173                         goto out;
 174         }
 175
 176         drv->remove(func);
 177
 178         if (func->irq_handler) {
 179                 printk(KERN_WARNING "WARNING: driver %s did not remove "
 180                         "its interrupt handler!\n", drv->name);
 181                 sdio_claim_host(func);
 182                 sdio_release_irq(func);
 183                 sdio_release_host(func);
 184         }
 185
 186         /* First, undo the increment made directly above */
 187         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 188                 pm_runtime_put_noidle(dev);
 189
 190         /* Then undo the runtime PM settings in sdio_bus_probe() */
 191         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 192                 pm_runtime_put_noidle(dev);
 193
 194 out:
 195         return ret;
 196 }
 197
 198 #ifdef CONFIG_PM_RUNTIME
 199
 200 static const struct dev_pm_ops sdio_bus_pm_ops = {
 201         SET_RUNTIME_PM_OPS(
 202                 pm_generic_runtime_suspend,
 203                 pm_generic_runtime_resume,
 204                 pm_generic_runtime_idle
 205         )
 206 };
 207
 208 #define SDIO_PM_OPS_PTR (&sdio_bus_pm_ops)
 209
 210 #else /* !CONFIG_PM_RUNTIME */
 211
 212 #define SDIO_PM_OPS_PTR NULL
 213
 214 #endif /* !CONFIG_PM_RUNTIME */
 215
 216 static struct bus_type sdio_bus_type = {
 217         .name           = "sdio",
 218         .dev_attrs      = sdio_dev_attrs,
 219         .match          = sdio_bus_match,
 220         .uevent         = sdio_bus_uevent,
 221         .probe          = sdio_bus_probe,
 222         .remove         = sdio_bus_remove,
 223         .pm             = SDIO_PM_OPS_PTR,
 224 };
 225
 226 int sdio_register_bus(void)
 227 {
 228         return bus_register(&sdio_bus_type);
 229 }
 230
 231 void sdio_unregister_bus(void)
 232 {
 233         bus_unregister(&sdio_bus_type);
 234 }
 235
 236 /**
 237  *      sdio_register_driver - register a function driver
 238  *      @drv: SDIO function driver
 239  */
 240 int sdio_register_driver(struct sdio_driver *drv)
 241 {
 242         drv->drv.name = drv->name;
 243         drv->drv.bus = &sdio_bus_type;
 244         return driver_register(&drv->drv);
 245 }
 246 EXPORT_SYMBOL_GPL(sdio_register_driver);
 247
 248 /**
 249  *      sdio_unregister_driver - unregister a function driver
 250  *      @drv: SDIO function driver
 251  */
 252 void sdio_unregister_driver(struct sdio_driver *drv)
 253 {
 254         drv->drv.bus = &sdio_bus_type;
 255         driver_unregister(&drv->drv);
 256 }
 257 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
 258
 259 static void sdio_release_func(struct device *dev)
 260 {
 261         struct sdio_func *func = dev_to_sdio_func(dev);
 262
 263         sdio_free_func_cis(func);
 264
 265         if (func->info)
 266                 kfree(func->info);
 267
 268         kfree(func);
 269 }
 270
 271 /*
 272  * Allocate and initialise a new SDIO function structure.
 273  */
 274 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 275 {
 276         struct sdio_func *func;
 277
 278         func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
 279         if (!func)
 280                 return ERR_PTR(-ENOMEM);
 281
 282         func->card = card;
 283
 284         device_initialize(&func->dev);
 285
 286         func->dev.parent = &card->dev;
 287         func->dev.bus = &sdio_bus_type;
 288         func->dev.release = sdio_release_func;
 289
 290         return func;
 291 }
 292
 293 /*
 294  * Register a new SDIO function with the driver model.
 295  */
 296 int sdio_add_func(struct sdio_func *func)
 297 {
 298         int ret;
 299
 300         dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
 301
 302         ret = device_add(&func->dev);
 303         if (ret == 0)
 304                 sdio_func_set_present(func);
 305
 306         return ret;
 307 }
 308
 309 /*
 310  * Unregister a SDIO function with the driver model, and
 311  * (eventually) free it.
 312  * This function can be called through error paths where sdio_add_func() was
 313  * never executed (because a failure occurred at an earlier point).
 314  */
 315 void sdio_remove_func(struct sdio_func *func)
 316 {
 317         if (!sdio_func_present(func))
 318                 return;
 319
 320         device_del(&func->dev);
 321         put_device(&func->dev);
 322 }
 323