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/export.h>
  17 #include <linux/slab.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/acpi.h>
  20
  21 #include <linux/mmc/card.h>
  22 #include <linux/mmc/host.h>
  23 #include <linux/mmc/sdio_func.h>
  24
  25 #include "sdio_cis.h"
  26 #include "sdio_bus.h"
  27
  28 /* show configuration fields */
  29 #define sdio_config_attr(field, format_string)                          \
  30 static ssize_t                                                          \
  31 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  32 {                                                                       \
  33         struct sdio_func *func;                                         \
  34                                                                         \
  35         func = dev_to_sdio_func (dev);                                  \
  36         return sprintf (buf, format_string, func->field);               \
  37 }                                                                       \
  38 static DEVICE_ATTR_RO(field)
  39
  40 sdio_config_attr(class, "0x%02x\n");
  41 sdio_config_attr(vendor, "0x%04x\n");
  42 sdio_config_attr(device, "0x%04x\n");
  43
  44 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
  45 {
  46         struct sdio_func *func = dev_to_sdio_func (dev);
  47
  48         return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
  49                         func->class, func->vendor, func->device);
  50 }
  51 static DEVICE_ATTR_RO(modalias);
  52
  53 static struct attribute *sdio_dev_attrs[] = {
  54         &dev_attr_class.attr,
  55         &dev_attr_vendor.attr,
  56         &dev_attr_device.attr,
  57         &dev_attr_modalias.attr,
  58         NULL,
  59 };
  60 ATTRIBUTE_GROUPS(sdio_dev);
  61
  62 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
  63         const struct sdio_device_id *id)
  64 {
  65         if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
  66                 return NULL;
  67         if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
  68                 return NULL;
  69         if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
  70                 return NULL;
  71         return id;
  72 }
  73
  74 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
  75         struct sdio_driver *sdrv)
  76 {
  77         const struct sdio_device_id *ids;
  78
  79         ids = sdrv->id_table;
  80
  81         if (ids) {
  82                 while (ids->class || ids->vendor || ids->device) {
  83                         if (sdio_match_one(func, ids))
  84                                 return ids;
  85                         ids++;
  86                 }
  87         }
  88
  89         return NULL;
  90 }
  91
  92 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
  93 {
  94         struct sdio_func *func = dev_to_sdio_func(dev);
  95         struct sdio_driver *sdrv = to_sdio_driver(drv);
  96
  97         if (sdio_match_device(func, sdrv))
  98                 return 1;
  99
 100         return 0;
 101 }
 102
 103 static int
 104 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 105 {
 106         struct sdio_func *func = dev_to_sdio_func(dev);
 107
 108         if (add_uevent_var(env,
 109                         "SDIO_CLASS=%02X", func->class))
 110                 return -ENOMEM;
 111
 112         if (add_uevent_var(env,
 113                         "SDIO_ID=%04X:%04X", func->vendor, func->device))
 114                 return -ENOMEM;
 115
 116         if (add_uevent_var(env,
 117                         "MODALIAS=sdio:c%02Xv%04Xd%04X",
 118                         func->class, func->vendor, func->device))
 119                 return -ENOMEM;
 120
 121         return 0;
 122 }
 123
 124 static int sdio_bus_probe(struct device *dev)
 125 {
 126         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 127         struct sdio_func *func = dev_to_sdio_func(dev);
 128         const struct sdio_device_id *id;
 129         int ret;
 130
 131         id = sdio_match_device(func, drv);
 132         if (!id)
 133                 return -ENODEV;
 134
 135         /* Unbound SDIO functions are always suspended.
 136          * During probe, the function is set active and the usage count
 137          * is incremented.  If the driver supports runtime PM,
 138          * it should call pm_runtime_put_noidle() in its probe routine and
 139          * pm_runtime_get_noresume() in its remove routine.
 140          */
 141         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
 142                 ret = pm_runtime_get_sync(dev);
 143                 if (ret < 0)
 144                         goto disable_runtimepm;
 145         }
 146
 147         /* Set the default block size so the driver is sure it's something
 148          * sensible. */
 149         sdio_claim_host(func);
 150         ret = sdio_set_block_size(func, 0);
 151         sdio_release_host(func);
 152         if (ret)
 153                 goto disable_runtimepm;
 154
 155         ret = drv->probe(func, id);
 156         if (ret)
 157                 goto disable_runtimepm;
 158
 159         return 0;
 160
 161 disable_runtimepm:
 162         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 163                 pm_runtime_put_noidle(dev);
 164         return ret;
 165 }
 166
 167 static int sdio_bus_remove(struct device *dev)
 168 {
 169         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 170         struct sdio_func *func = dev_to_sdio_func(dev);
 171         int ret = 0;
 172
 173         /* Make sure card is powered before invoking ->remove() */
 174         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 175                 pm_runtime_get_sync(dev);
 176
 177         drv->remove(func);
 178
 179         if (func->irq_handler) {
 180                 pr_warning("WARNING: driver %s did not remove "
 181                         "its interrupt handler!\n", drv->name);
 182                 sdio_claim_host(func);
 183                 sdio_release_irq(func);
 184                 sdio_release_host(func);
 185         }
 186
 187         /* First, undo the increment made directly above */
 188         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 189                 pm_runtime_put_noidle(dev);
 190
 191         /* Then undo the runtime PM settings in sdio_bus_probe() */
 192         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 193                 pm_runtime_put_sync(dev);
 194
 195         return ret;
 196 }
 197
 198 #ifdef CONFIG_PM
 199
 200 #ifdef CONFIG_PM_SLEEP
 201 static int pm_no_operation(struct device *dev)
 202 {
 203         /*
 204          * Prevent the PM core from calling SDIO device drivers' suspend
 205          * callback routines, which it is not supposed to do, by using this
 206          * empty function as the bus type suspend callaback for SDIO.
 207          */
 208         return 0;
 209 }
 210 #endif
 211
 212 static const struct dev_pm_ops sdio_bus_pm_ops = {
 213         SET_SYSTEM_SLEEP_PM_OPS(pm_no_operation, pm_no_operation)
 214         SET_RUNTIME_PM_OPS(
 215                 pm_generic_runtime_suspend,
 216                 pm_generic_runtime_resume,
 217                 NULL
 218         )
 219 };
 220
 221 #define SDIO_PM_OPS_PTR (&sdio_bus_pm_ops)
 222
 223 #else /* !CONFIG_PM */
 224
 225 #define SDIO_PM_OPS_PTR NULL
 226
 227 #endif /* !CONFIG_PM */
 228
 229 static struct bus_type sdio_bus_type = {
 230         .name           = "sdio",
 231         .dev_groups     = sdio_dev_groups,
 232         .match          = sdio_bus_match,
 233         .uevent         = sdio_bus_uevent,
 234         .probe          = sdio_bus_probe,
 235         .remove         = sdio_bus_remove,
 236         .pm             = SDIO_PM_OPS_PTR,
 237 };
 238
 239 int sdio_register_bus(void)
 240 {
 241         return bus_register(&sdio_bus_type);
 242 }
 243
 244 void sdio_unregister_bus(void)
 245 {
 246         bus_unregister(&sdio_bus_type);
 247 }
 248
 249 /**
 250  *      sdio_register_driver - register a function driver
 251  *      @drv: SDIO function driver
 252  */
 253 int sdio_register_driver(struct sdio_driver *drv)
 254 {
 255         drv->drv.name = drv->name;
 256         drv->drv.bus = &sdio_bus_type;
 257         return driver_register(&drv->drv);
 258 }
 259 EXPORT_SYMBOL_GPL(sdio_register_driver);
 260
 261 /**
 262  *      sdio_unregister_driver - unregister a function driver
 263  *      @drv: SDIO function driver
 264  */
 265 void sdio_unregister_driver(struct sdio_driver *drv)
 266 {
 267         drv->drv.bus = &sdio_bus_type;
 268         driver_unregister(&drv->drv);
 269 }
 270 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
 271
 272 static void sdio_release_func(struct device *dev)
 273 {
 274         struct sdio_func *func = dev_to_sdio_func(dev);
 275
 276         sdio_free_func_cis(func);
 277
 278         kfree(func->info);
 279
 280         kfree(func);
 281 }
 282
 283 /*
 284  * Allocate and initialise a new SDIO function structure.
 285  */
 286 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 287 {
 288         struct sdio_func *func;
 289
 290         func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
 291         if (!func)
 292                 return ERR_PTR(-ENOMEM);
 293
 294         func->card = card;
 295
 296         device_initialize(&func->dev);
 297
 298         func->dev.parent = &card->dev;
 299         func->dev.bus = &sdio_bus_type;
 300         func->dev.release = sdio_release_func;
 301
 302         return func;
 303 }
 304
 305 #ifdef CONFIG_ACPI
 306 static void sdio_acpi_set_handle(struct sdio_func *func)
 307 {
 308         struct mmc_host *host = func->card->host;
 309         u64 addr = (host->slotno << 16) | func->num;
 310
 311         acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
 312 }
 313 #else
 314 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
 315 #endif
 316
 317 /*
 318  * Register a new SDIO function with the driver model.
 319  */
 320 int sdio_add_func(struct sdio_func *func)
 321 {
 322         int ret;
 323
 324         dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
 325
 326         sdio_acpi_set_handle(func);
 327         ret = device_add(&func->dev);
 328         if (ret == 0) {
 329                 sdio_func_set_present(func);
 330                 acpi_dev_pm_attach(&func->dev, false);
 331         }
 332
 333         return ret;
 334 }
 335
 336 /*
 337  * Unregister a SDIO function with the driver model, and
 338  * (eventually) free it.
 339  * This function can be called through error paths where sdio_add_func() was
 340  * never executed (because a failure occurred at an earlier point).
 341  */
 342 void sdio_remove_func(struct sdio_func *func)
 343 {
 344         if (!sdio_func_present(func))
 345                 return;
 346
 347         acpi_dev_pm_detach(&func->dev, false);
 348         device_del(&func->dev);
 349         put_device(&func->dev);
 350 }
 351