drivers/mmc/core/sdio_bus.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  linux/drivers/mmc/core/sdio_bus.c
   4  *
   5  *  Copyright 2007 Pierre Ossman
   6  *
   7  * SDIO function driver model
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/err.h>
  12 #include <linux/export.h>
  13 #include <linux/slab.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/pm_domain.h>
  16 #include <linux/acpi.h>
  17
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/host.h>
  20 #include <linux/mmc/sdio_func.h>
  21 #include <linux/of.h>
  22
  23 #include "core.h"
  24 #include "card.h"
  25 #include "sdio_cis.h"
  26 #include "sdio_bus.h"
  27
  28 #define to_sdio_driver(d)       container_of(d, struct sdio_driver, drv)
  29
  30 /* show configuration fields */
  31 #define sdio_config_attr(field, format_string)                          \
  32 static ssize_t                                                          \
  33 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                              \
  34 {                                                                       \
  35         struct sdio_func *func;                                         \
  36                                                                         \
  37         func = dev_to_sdio_func (dev);                                  \
  38         return sprintf (buf, format_string, func->field);               \
  39 }                                                                       \
  40 static DEVICE_ATTR_RO(field)
  41
  42 sdio_config_attr(class, "0x%02x\n");
  43 sdio_config_attr(vendor, "0x%04x\n");
  44 sdio_config_attr(device, "0x%04x\n");
  45
  46 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
  47 {
  48         struct sdio_func *func = dev_to_sdio_func (dev);
  49
  50         return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
  51                         func->class, func->vendor, func->device);
  52 }
  53 static DEVICE_ATTR_RO(modalias);
  54
  55 static struct attribute *sdio_dev_attrs[] = {
  56         &dev_attr_class.attr,
  57         &dev_attr_vendor.attr,
  58         &dev_attr_device.attr,
  59         &dev_attr_modalias.attr,
  60         NULL,
  61 };
  62 ATTRIBUTE_GROUPS(sdio_dev);
  63
  64 static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
  65         const struct sdio_device_id *id)
  66 {
  67         if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
  68                 return NULL;
  69         if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
  70                 return NULL;
  71         if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
  72                 return NULL;
  73         return id;
  74 }
  75
  76 static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
  77         struct sdio_driver *sdrv)
  78 {
  79         const struct sdio_device_id *ids;
  80
  81         ids = sdrv->id_table;
  82
  83         if (ids) {
  84                 while (ids->class || ids->vendor || ids->device) {
  85                         if (sdio_match_one(func, ids))
  86                                 return ids;
  87                         ids++;
  88                 }
  89         }
  90
  91         return NULL;
  92 }
  93
  94 static int sdio_bus_match(struct device *dev, struct device_driver *drv)
  95 {
  96         struct sdio_func *func = dev_to_sdio_func(dev);
  97         struct sdio_driver *sdrv = to_sdio_driver(drv);
  98
  99         if (sdio_match_device(func, sdrv))
 100                 return 1;
 101
 102         return 0;
 103 }
 104
 105 static int
 106 sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 107 {
 108         struct sdio_func *func = dev_to_sdio_func(dev);
 109
 110         if (add_uevent_var(env,
 111                         "SDIO_CLASS=%02X", func->class))
 112                 return -ENOMEM;
 113
 114         if (add_uevent_var(env,
 115                         "SDIO_ID=%04X:%04X", func->vendor, func->device))
 116                 return -ENOMEM;
 117
 118         if (add_uevent_var(env,
 119                         "MODALIAS=sdio:c%02Xv%04Xd%04X",
 120                         func->class, func->vendor, func->device))
 121                 return -ENOMEM;
 122
 123         return 0;
 124 }
 125
 126 static int sdio_bus_probe(struct device *dev)
 127 {
 128         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 129         struct sdio_func *func = dev_to_sdio_func(dev);
 130         const struct sdio_device_id *id;
 131         int ret;
 132
 133         id = sdio_match_device(func, drv);
 134         if (!id)
 135                 return -ENODEV;
 136
 137         ret = dev_pm_domain_attach(dev, false);
 138         if (ret)
 139                 return ret;
 140
 141         /* Unbound SDIO functions are always suspended.
 142          * During probe, the function is set active and the usage count
 143          * is incremented.  If the driver supports runtime PM,
 144          * it should call pm_runtime_put_noidle() in its probe routine and
 145          * pm_runtime_get_noresume() in its remove routine.
 146          */
 147         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
 148                 ret = pm_runtime_get_sync(dev);
 149                 if (ret < 0)
 150                         goto disable_runtimepm;
 151         }
 152
 153         /* Set the default block size so the driver is sure it's something
 154          * sensible. */
 155         sdio_claim_host(func);
 156         ret = sdio_set_block_size(func, 0);
 157         sdio_release_host(func);
 158         if (ret)
 159                 goto disable_runtimepm;
 160
 161         ret = drv->probe(func, id);
 162         if (ret)
 163                 goto disable_runtimepm;
 164
 165         return 0;
 166
 167 disable_runtimepm:
 168         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 169                 pm_runtime_put_noidle(dev);
 170         dev_pm_domain_detach(dev, false);
 171         return ret;
 172 }
 173
 174 static int sdio_bus_remove(struct device *dev)
 175 {
 176         struct sdio_driver *drv = to_sdio_driver(dev->driver);
 177         struct sdio_func *func = dev_to_sdio_func(dev);
 178
 179         /* Make sure card is powered before invoking ->remove() */
 180         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 181                 pm_runtime_get_sync(dev);
 182
 183         drv->remove(func);
 184
 185         if (func->irq_handler) {
 186                 pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
 187                         drv->name);
 188                 sdio_claim_host(func);
 189                 sdio_release_irq(func);
 190                 sdio_release_host(func);
 191         }
 192
 193         /* First, undo the increment made directly above */
 194         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 195                 pm_runtime_put_noidle(dev);
 196
 197         /* Then undo the runtime PM settings in sdio_bus_probe() */
 198         if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
 199                 pm_runtime_put_sync(dev);
 200
 201         dev_pm_domain_detach(dev, false);
 202
 203         return 0;
 204 }
 205
 206 static const struct dev_pm_ops sdio_bus_pm_ops = {
 207         SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
 208         SET_RUNTIME_PM_OPS(
 209                 pm_generic_runtime_suspend,
 210                 pm_generic_runtime_resume,
 211                 NULL
 212         )
 213 };
 214
 215 static struct bus_type sdio_bus_type = {
 216         .name           = "sdio",
 217         .dev_groups     = sdio_dev_groups,
 218         .match          = sdio_bus_match,
 219         .uevent         = sdio_bus_uevent,
 220         .probe          = sdio_bus_probe,
 221         .remove         = sdio_bus_remove,
 222         .pm             = &sdio_bus_pm_ops,
 223 };
 224
 225 int sdio_register_bus(void)
 226 {
 227         return bus_register(&sdio_bus_type);
 228 }
 229
 230 void sdio_unregister_bus(void)
 231 {
 232         bus_unregister(&sdio_bus_type);
 233 }
 234
 235 /**
 236  *      sdio_register_driver - register a function driver
 237  *      @drv: SDIO function driver
 238  */
 239 int sdio_register_driver(struct sdio_driver *drv)
 240 {
 241         drv->drv.name = drv->name;
 242         drv->drv.bus = &sdio_bus_type;
 243         return driver_register(&drv->drv);
 244 }
 245 EXPORT_SYMBOL_GPL(sdio_register_driver);
 246
 247 /**
 248  *      sdio_unregister_driver - unregister a function driver
 249  *      @drv: SDIO function driver
 250  */
 251 void sdio_unregister_driver(struct sdio_driver *drv)
 252 {
 253         drv->drv.bus = &sdio_bus_type;
 254         driver_unregister(&drv->drv);
 255 }
 256 EXPORT_SYMBOL_GPL(sdio_unregister_driver);
 257
 258 static void sdio_release_func(struct device *dev)
 259 {
 260         struct sdio_func *func = dev_to_sdio_func(dev);
 261
 262         sdio_free_func_cis(func);
 263
 264         kfree(func->info);
 265         kfree(func->tmpbuf);
 266         kfree(func);
 267 }
 268
 269 /*
 270  * Allocate and initialise a new SDIO function structure.
 271  */
 272 struct sdio_func *sdio_alloc_func(struct mmc_card *card)
 273 {
 274         struct sdio_func *func;
 275
 276         func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
 277         if (!func)
 278                 return ERR_PTR(-ENOMEM);
 279
 280         /*
 281          * allocate buffer separately to make sure it's properly aligned for
 282          * DMA usage (incl. 64 bit DMA)
 283          */
 284         func->tmpbuf = kmalloc(4, GFP_KERNEL);
 285         if (!func->tmpbuf) {
 286                 kfree(func);
 287                 return ERR_PTR(-ENOMEM);
 288         }
 289
 290         func->card = card;
 291
 292         device_initialize(&func->dev);
 293
 294         func->dev.parent = &card->dev;
 295         func->dev.bus = &sdio_bus_type;
 296         func->dev.release = sdio_release_func;
 297
 298         return func;
 299 }
 300
 301 #ifdef CONFIG_ACPI
 302 static void sdio_acpi_set_handle(struct sdio_func *func)
 303 {
 304         struct mmc_host *host = func->card->host;
 305         u64 addr = ((u64)host->slotno << 16) | func->num;
 306
 307         acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
 308 }
 309 #else
 310 static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
 311 #endif
 312
 313 static void sdio_set_of_node(struct sdio_func *func)
 314 {
 315         struct mmc_host *host = func->card->host;
 316
 317         func->dev.of_node = mmc_of_find_child_device(host, func->num);
 318 }
 319
 320 /*
 321  * Register a new SDIO function with the driver model.
 322  */
 323 int sdio_add_func(struct sdio_func *func)
 324 {
 325         int ret;
 326
 327         dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
 328
 329         sdio_set_of_node(func);
 330         sdio_acpi_set_handle(func);
 331         device_enable_async_suspend(&func->dev);
 332         ret = device_add(&func->dev);
 333         if (ret == 0)
 334                 sdio_func_set_present(func);
 335
 336         return ret;
 337 }
 338
 339 /*
 340  * Unregister a SDIO function with the driver model, and
 341  * (eventually) free it.
 342  * This function can be called through error paths where sdio_add_func() was
 343  * never executed (because a failure occurred at an earlier point).
 344  */
 345 void sdio_remove_func(struct sdio_func *func)
 346 {
 347         if (!sdio_func_present(func))
 348                 return;
 349
 350         device_del(&func->dev);
 351         of_node_put(func->dev.of_node);
 352         put_device(&func->dev);
 353 }
 354