1 /* 2 * linux/drivers/mmc/core/bus.c 3 * 4 * Copyright (C) 2003 Russell King, All Rights Reserved. 5 * Copyright (C) 2007 Pierre Ossman 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * MMC card bus driver model 12 */ 13 14 #include <linux/export.h> 15 #include <linux/device.h> 16 #include <linux/err.h> 17 #include <linux/slab.h> 18 #include <linux/stat.h> 19 #include <linux/pm_runtime.h> 20 21 #include <linux/mmc/card.h> 22 #include <linux/mmc/host.h> 23 24 #include "core.h" 25 #include "sdio_cis.h" 26 #include "bus.h" 27 28 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) 29 30 static ssize_t type_show(struct device *dev, 31 struct device_attribute *attr, char *buf) 32 { 33 struct mmc_card *card = mmc_dev_to_card(dev); 34 35 switch (card->type) { 36 case MMC_TYPE_MMC: 37 return sprintf(buf, "MMC\n"); 38 case MMC_TYPE_SD: 39 return sprintf(buf, "SD\n"); 40 case MMC_TYPE_SDIO: 41 return sprintf(buf, "SDIO\n"); 42 case MMC_TYPE_SD_COMBO: 43 return sprintf(buf, "SDcombo\n"); 44 default: 45 return -EFAULT; 46 } 47 } 48 static DEVICE_ATTR_RO(type); 49 50 static struct attribute *mmc_dev_attrs[] = { 51 &dev_attr_type.attr, 52 NULL, 53 }; 54 ATTRIBUTE_GROUPS(mmc_dev); 55 56 /* 57 * This currently matches any MMC driver to any MMC card - drivers 58 * themselves make the decision whether to drive this card in their 59 * probe method. 60 */ 61 static int mmc_bus_match(struct device *dev, struct device_driver *drv) 62 { 63 return 1; 64 } 65 66 static int 67 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 68 { 69 struct mmc_card *card = mmc_dev_to_card(dev); 70 const char *type; 71 int retval = 0; 72 73 switch (card->type) { 74 case MMC_TYPE_MMC: 75 type = "MMC"; 76 break; 77 case MMC_TYPE_SD: 78 type = "SD"; 79 break; 80 case MMC_TYPE_SDIO: 81 type = "SDIO"; 82 break; 83 case MMC_TYPE_SD_COMBO: 84 type = "SDcombo"; 85 break; 86 default: 87 type = NULL; 88 } 89 90 if (type) { 91 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 92 if (retval) 93 return retval; 94 } 95 96 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 97 if (retval) 98 return retval; 99 100 /* 101 * Request the mmc_block device. Note: that this is a direct request 102 * for the module it carries no information as to what is inserted. 103 */ 104 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 105 106 return retval; 107 } 108 109 static int mmc_bus_probe(struct device *dev) 110 { 111 struct mmc_driver *drv = to_mmc_driver(dev->driver); 112 struct mmc_card *card = mmc_dev_to_card(dev); 113 114 return drv->probe(card); 115 } 116 117 static int mmc_bus_remove(struct device *dev) 118 { 119 struct mmc_driver *drv = to_mmc_driver(dev->driver); 120 struct mmc_card *card = mmc_dev_to_card(dev); 121 122 drv->remove(card); 123 124 return 0; 125 } 126 127 static void mmc_bus_shutdown(struct device *dev) 128 { 129 struct mmc_driver *drv = to_mmc_driver(dev->driver); 130 struct mmc_card *card = mmc_dev_to_card(dev); 131 struct mmc_host *host = card->host; 132 int ret; 133 134 if (dev->driver && drv->shutdown) 135 drv->shutdown(card); 136 137 if (host->bus_ops->shutdown) { 138 ret = host->bus_ops->shutdown(host); 139 if (ret) 140 pr_warn("%s: error %d during shutdown\n", 141 mmc_hostname(host), ret); 142 } 143 } 144 145 #ifdef CONFIG_PM_SLEEP 146 static int mmc_bus_suspend(struct device *dev) 147 { 148 struct mmc_driver *drv = to_mmc_driver(dev->driver); 149 struct mmc_card *card = mmc_dev_to_card(dev); 150 struct mmc_host *host = card->host; 151 int ret; 152 153 if (dev->driver && drv->suspend) { 154 ret = drv->suspend(card); 155 if (ret) 156 return ret; 157 } 158 159 ret = host->bus_ops->suspend(host); 160 return ret; 161 } 162 163 static int mmc_bus_resume(struct device *dev) 164 { 165 struct mmc_driver *drv = to_mmc_driver(dev->driver); 166 struct mmc_card *card = mmc_dev_to_card(dev); 167 struct mmc_host *host = card->host; 168 int ret; 169 170 ret = host->bus_ops->resume(host); 171 if (ret) 172 pr_warn("%s: error %d during resume (card was removed?)\n", 173 mmc_hostname(host), ret); 174 175 if (dev->driver && drv->resume) 176 ret = drv->resume(card); 177 178 return ret; 179 } 180 #endif 181 182 #ifdef CONFIG_PM_RUNTIME 183 184 static int mmc_runtime_suspend(struct device *dev) 185 { 186 struct mmc_card *card = mmc_dev_to_card(dev); 187 struct mmc_host *host = card->host; 188 int ret = 0; 189 190 if (host->bus_ops->runtime_suspend) 191 ret = host->bus_ops->runtime_suspend(host); 192 193 return ret; 194 } 195 196 static int mmc_runtime_resume(struct device *dev) 197 { 198 struct mmc_card *card = mmc_dev_to_card(dev); 199 struct mmc_host *host = card->host; 200 int ret = 0; 201 202 if (host->bus_ops->runtime_resume) 203 ret = host->bus_ops->runtime_resume(host); 204 205 return ret; 206 } 207 208 static int mmc_runtime_idle(struct device *dev) 209 { 210 return 0; 211 } 212 213 #endif /* !CONFIG_PM_RUNTIME */ 214 215 static const struct dev_pm_ops mmc_bus_pm_ops = { 216 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, 217 mmc_runtime_idle) 218 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 219 }; 220 221 static struct bus_type mmc_bus_type = { 222 .name = "mmc", 223 .dev_groups = mmc_dev_groups, 224 .match = mmc_bus_match, 225 .uevent = mmc_bus_uevent, 226 .probe = mmc_bus_probe, 227 .remove = mmc_bus_remove, 228 .shutdown = mmc_bus_shutdown, 229 .pm = &mmc_bus_pm_ops, 230 }; 231 232 int mmc_register_bus(void) 233 { 234 return bus_register(&mmc_bus_type); 235 } 236 237 void mmc_unregister_bus(void) 238 { 239 bus_unregister(&mmc_bus_type); 240 } 241 242 /** 243 * mmc_register_driver - register a media driver 244 * @drv: MMC media driver 245 */ 246 int mmc_register_driver(struct mmc_driver *drv) 247 { 248 drv->drv.bus = &mmc_bus_type; 249 return driver_register(&drv->drv); 250 } 251 252 EXPORT_SYMBOL(mmc_register_driver); 253 254 /** 255 * mmc_unregister_driver - unregister a media driver 256 * @drv: MMC media driver 257 */ 258 void mmc_unregister_driver(struct mmc_driver *drv) 259 { 260 drv->drv.bus = &mmc_bus_type; 261 driver_unregister(&drv->drv); 262 } 263 264 EXPORT_SYMBOL(mmc_unregister_driver); 265 266 static void mmc_release_card(struct device *dev) 267 { 268 struct mmc_card *card = mmc_dev_to_card(dev); 269 270 sdio_free_common_cis(card); 271 272 kfree(card->info); 273 274 kfree(card); 275 } 276 277 /* 278 * Allocate and initialise a new MMC card structure. 279 */ 280 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 281 { 282 struct mmc_card *card; 283 284 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 285 if (!card) 286 return ERR_PTR(-ENOMEM); 287 288 card->host = host; 289 290 device_initialize(&card->dev); 291 292 card->dev.parent = mmc_classdev(host); 293 card->dev.bus = &mmc_bus_type; 294 card->dev.release = mmc_release_card; 295 card->dev.type = type; 296 297 return card; 298 } 299 300 /* 301 * Register a new MMC card with the driver model. 302 */ 303 int mmc_add_card(struct mmc_card *card) 304 { 305 int ret; 306 const char *type; 307 const char *uhs_bus_speed_mode = ""; 308 static const char *const uhs_speeds[] = { 309 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 310 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 311 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 312 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 313 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 314 }; 315 316 317 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 318 319 switch (card->type) { 320 case MMC_TYPE_MMC: 321 type = "MMC"; 322 break; 323 case MMC_TYPE_SD: 324 type = "SD"; 325 if (mmc_card_blockaddr(card)) { 326 if (mmc_card_ext_capacity(card)) 327 type = "SDXC"; 328 else 329 type = "SDHC"; 330 } 331 break; 332 case MMC_TYPE_SDIO: 333 type = "SDIO"; 334 break; 335 case MMC_TYPE_SD_COMBO: 336 type = "SD-combo"; 337 if (mmc_card_blockaddr(card)) 338 type = "SDHC-combo"; 339 break; 340 default: 341 type = "?"; 342 break; 343 } 344 345 if (mmc_card_uhs(card) && 346 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 347 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 348 349 if (mmc_host_is_spi(card->host)) { 350 pr_info("%s: new %s%s%s card on SPI\n", 351 mmc_hostname(card->host), 352 mmc_card_highspeed(card) ? "high speed " : "", 353 mmc_card_ddr_mode(card) ? "DDR " : "", 354 type); 355 } else { 356 pr_info("%s: new %s%s%s%s%s card at address %04x\n", 357 mmc_hostname(card->host), 358 mmc_card_uhs(card) ? "ultra high speed " : 359 (mmc_card_highspeed(card) ? "high speed " : ""), 360 (mmc_card_hs200(card) ? "HS200 " : ""), 361 mmc_card_ddr_mode(card) ? "DDR " : "", 362 uhs_bus_speed_mode, type, card->rca); 363 } 364 365 #ifdef CONFIG_DEBUG_FS 366 mmc_add_card_debugfs(card); 367 #endif 368 mmc_init_context_info(card->host); 369 370 ret = device_add(&card->dev); 371 if (ret) 372 return ret; 373 374 mmc_card_set_present(card); 375 376 return 0; 377 } 378 379 /* 380 * Unregister a new MMC card with the driver model, and 381 * (eventually) free it. 382 */ 383 void mmc_remove_card(struct mmc_card *card) 384 { 385 #ifdef CONFIG_DEBUG_FS 386 mmc_remove_card_debugfs(card); 387 #endif 388 389 if (mmc_card_present(card)) { 390 if (mmc_host_is_spi(card->host)) { 391 pr_info("%s: SPI card removed\n", 392 mmc_hostname(card->host)); 393 } else { 394 pr_info("%s: card %04x removed\n", 395 mmc_hostname(card->host), card->rca); 396 } 397 device_del(&card->dev); 398 } 399 400 put_device(&card->dev); 401 } 402 403