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 "card.h"
  29 #include "sdio_cis.h"
  30 #include "sdio_bus.h"
  31
  32 #define to_sdio_driver(d)       container_of(d, struct sdio_driver, drv)
  33
  34 /* show configuration fields */
  35 #define sdio_config_attr(field, format_string)                          \
  36 static ssize_t                                                          \
  37 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  38 {                                                                       \
  39         struct sdio_func *func;                                         \
  40                                                                         \
  41         func = dev_to_sdio_func (dev);                                  \
  42         return sprintf (buf, format_string, func->field);               \
  43 }                                                                       \
  44 static DEVICE_ATTR_RO(field)
  45
  46 sdio_config_attr(class, "0x%02x\n");
  47 sdio_config_attr(vendor, "0x%04x\n");
  48 sdio_config_attr(device, "0x%04x\n");
  49
  50 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
  51 {
  52         struct sdio_func *func = dev_to_sdio_func (dev);
  53
  54         return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
  55                         func->class, func->vendor, func->device);
  56 }
  57 static DEVICE_ATTR_RO(modalias);
  58
  59 static struct attribute *sdio_dev_attrs[] = {
  60         &dev_attr_class.attr,
  61         &dev_attr_vendor.attr,
  62         &dev_attr_device.attr,
  63         &dev_attr_modalias.attr,
  64         NULL,
  65 };
  66 ATTRIBUTE_GROUPS(sdio_dev);
  67
  68 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
  69         const struct sdio_device_id *id)
  70 {
  71         if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
  72                 return NULL;
  73         if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
  74                 return NULL;
  75         if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
  76                 return NULL;
  77         return id;
  78 }
  79
  80 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
  81         struct sdio_driver *sdrv)
  82 {
  83         const struct sdio_device_id *ids;
  84
  85         ids = sdrv->id_table;
  86
  87         if (ids) {
  88                 while (ids->class || ids->vendor || ids->device) {
  89                         if (sdio_match_one(func, ids))
  90                                 return ids;
  91                         ids++;
  92                 }
  93         }
  94
  95         return NULL;
  96 }
  97
  98 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
  99 {
 100         struct sdio_func *func = dev_to_sdio_func(dev);
 101         struct sdio_driver *sdrv = to_sdio_driver(drv);
 102
 103         if (sdio_match_device(func, sdrv))
 104                 return 1;
 105
 106         return 0;
 107 }
 108
 109 static int
 110 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 111 {
 112         struct sdio_func *func = dev_to_sdio_func(dev);
 113
 114         if (add_uevent_var(env,
 115                         "SDIO_CLASS=%02X", func->class))
 116                 return -ENOMEM;
 117
 118         if (add_uevent_var(env,
 119                         "SDIO_ID=%04X:%04X", func->vendor, func->device))
 120                 return -ENOMEM;
 121
 122         if (add_uevent_var(env,
 123                         "MODALIAS=sdio:c%02Xv%04Xd%04X",
 124                         func->class, func->vendor, func->device))
 125                 return -ENOMEM;
 126
 127         return 0;
 128 }
 129
 130 static int sdio_bus_probe(struct device *dev)
 131 {
 132         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 133         struct sdio_func *func = dev_to_sdio_func(dev);
 134         const struct sdio_device_id *id;
 135         int ret;
 136
 137         id = sdio_match_device(func, drv);
 138         if (!id)
 139                 return -ENODEV;
 140
 141         ret = dev_pm_domain_attach(dev, false);
 142         if (ret)
 143                 return ret;
 144
 145         /* Unbound SDIO functions are always suspended.
 146          * During probe, the function is set active and the usage count
 147          * is incremented.  If the driver supports runtime PM,
 148          * it should call pm_runtime_put_noidle() in its probe routine and
 149          * pm_runtime_get_noresume() in its remove routine.
 150          */
 151         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
 152                 ret = pm_runtime_get_sync(dev);
 153                 if (ret < 0)
 154                         goto disable_runtimepm;
 155         }
 156
 157         /* Set the default block size so the driver is sure it's something
 158          * sensible. */
 159         sdio_claim_host(func);
 160         ret = sdio_set_block_size(func, 0);
 161         sdio_release_host(func);
 162         if (ret)
 163                 goto disable_runtimepm;
 164
 165         ret = drv->probe(func, id);
 166         if (ret)
 167                 goto disable_runtimepm;
 168
 169         return 0;
 170
 171 disable_runtimepm:
 172         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 173                 pm_runtime_put_noidle(dev);
 174         dev_pm_domain_detach(dev, false);
 175         return ret;
 176 }
 177
 178 static int sdio_bus_remove(struct device *dev)
 179 {
 180         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 181         struct sdio_func *func = dev_to_sdio_func(dev);
 182         int ret = 0;
 183
 184         /* Make sure card is powered before invoking ->remove() */
 185         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 186                 pm_runtime_get_sync(dev);
 187
 188         drv->remove(func);
 189
 190         if (func->irq_handler) {
 191                 pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
 192                         drv->name);
 193                 sdio_claim_host(func);
 194                 sdio_release_irq(func);
 195                 sdio_release_host(func);
 196         }
 197
 198         /* First, undo the increment made directly above */
 199         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 200                 pm_runtime_put_noidle(dev);
 201
 202         /* Then undo the runtime PM settings in sdio_bus_probe() */
 203         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 204                 pm_runtime_put_sync(dev);
 205
 206         dev_pm_domain_detach(dev, false);
 207
 208         return ret;
 209 }
 210
 211 static const struct dev_pm_ops sdio_bus_pm_ops = {
 212         SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
 213         SET_RUNTIME_PM_OPS(
 214                 pm_generic_runtime_suspend,
 215                 pm_generic_runtime_resume,
 216                 NULL
 217         )
 218 };
 219
 220 static struct bus_type sdio_bus_type = {
 221         .name           = "sdio",
 222         .dev_groups     = sdio_dev_groups,
 223         .match          = sdio_bus_match,
 224         .uevent         = sdio_bus_uevent,
 225         .probe          = sdio_bus_probe,
 226         .remove         = sdio_bus_remove,
 227         .pm             = &sdio_bus_pm_ops,
 228 };
 229
 230 int sdio_register_bus(void)
 231 {
 232         return bus_register(&sdio_bus_type);
 233 }
 234
 235 void sdio_unregister_bus(void)
 236 {
 237         bus_unregister(&sdio_bus_type);
 238 }
 239
 240 /**
 241  *      sdio_register_driver - register a function driver
 242  *      @drv: SDIO function driver
 243  */
 244 int sdio_register_driver(struct sdio_driver *drv)
 245 {
 246         drv->drv.name = drv->name;
 247         drv->drv.bus = &sdio_bus_type;
 248         return driver_register(&drv->drv);
 249 }
 250 EXPORT_SYMBOL_GPL(sdio_register_driver);
 251
 252 /**
 253  *      sdio_unregister_driver - unregister a function driver
 254  *      @drv: SDIO function driver
 255  */
 256 void sdio_unregister_driver(struct sdio_driver *drv)
 257 {
 258         drv->drv.bus = &sdio_bus_type;
 259         driver_unregister(&drv->drv);
 260 }
 261 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
 262
 263 static void sdio_release_func(struct device *dev)
 264 {
 265         struct sdio_func *func = dev_to_sdio_func(dev);
 266
 267         sdio_free_func_cis(func);
 268
 269         kfree(func->info);
 270         kfree(func->tmpbuf);
 271         kfree(func);
 272 }
 273
 274 /*
 275  * Allocate and initialise a new SDIO function structure.
 276  */
 277 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 278 {
 279         struct sdio_func *func;
 280
 281         func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
 282         if (!func)
 283                 return ERR_PTR(-ENOMEM);
 284
 285         /*
 286          * allocate buffer separately to make sure it's properly aligned for
 287          * DMA usage (incl. 64 bit DMA)
 288          */
 289         func->tmpbuf = kmalloc(4, GFP_KERNEL);
 290         if (!func->tmpbuf) {
 291                 kfree(func);
 292                 return ERR_PTR(-ENOMEM);
 293         }
 294
 295         func->card = card;
 296
 297         device_initialize(&func->dev);
 298
 299         func->dev.parent = &card->dev;
 300         func->dev.bus = &sdio_bus_type;
 301         func->dev.release = sdio_release_func;
 302
 303         return func;
 304 }
 305
 306 #ifdef CONFIG_ACPI
 307 static void sdio_acpi_set_handle(struct sdio_func *func)
 308 {
 309         struct mmc_host *host = func->card->host;
 310         u64 addr = ((u64)host->slotno << 16) | func->num;
 311
 312         acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
 313 }
 314 #else
 315 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
 316 #endif
 317
 318 static void sdio_set_of_node(struct sdio_func *func)
 319 {
 320         struct mmc_host *host = func->card->host;
 321
 322         func->dev.of_node = mmc_of_find_child_device(host, func->num);
 323 }
 324
 325 /*
 326  * Register a new SDIO function with the driver model.
 327  */
 328 int sdio_add_func(struct sdio_func *func)
 329 {
 330         int ret;
 331
 332         dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
 333
 334         sdio_set_of_node(func);
 335         sdio_acpi_set_handle(func);
 336         device_enable_async_suspend(&func->dev);
 337         ret = device_add(&func->dev);
 338         if (ret == 0)
 339                 sdio_func_set_present(func);
 340
 341         return ret;
 342 }
 343
 344 /*
 345  * Unregister a SDIO function with the driver model, and
 346  * (eventually) free it.
 347  * This function can be called through error paths where sdio_add_func() was
 348  * never executed (because a failure occurred at an earlier point).
 349  */
 350 void sdio_remove_func(struct sdio_func *func)
 351 {
 352         if (!sdio_func_present(func))
 353                 return;
 354
 355         device_del(&func->dev);
 356         of_node_put(func->dev.of_node);
 357         put_device(&func->dev);
 358 }
 359