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