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; 188 189 return host->bus_ops->runtime_suspend(host); 190 } 191 192 static int mmc_runtime_resume(struct device *dev) 193 { 194 struct mmc_card *card = mmc_dev_to_card(dev); 195 struct mmc_host *host = card->host; 196 197 return host->bus_ops->runtime_resume(host); 198 } 199 200 static int mmc_runtime_idle(struct device *dev) 201 { 202 return 0; 203 } 204 205 #endif /* !CONFIG_PM_RUNTIME */ 206 207 static const struct dev_pm_ops mmc_bus_pm_ops = { 208 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, 209 mmc_runtime_idle) 210 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 211 }; 212 213 static struct bus_type mmc_bus_type = { 214 .name = "mmc", 215 .dev_groups = mmc_dev_groups, 216 .match = mmc_bus_match, 217 .uevent = mmc_bus_uevent, 218 .probe = mmc_bus_probe, 219 .remove = mmc_bus_remove, 220 .shutdown = mmc_bus_shutdown, 221 .pm = &mmc_bus_pm_ops, 222 }; 223 224 int mmc_register_bus(void) 225 { 226 return bus_register(&mmc_bus_type); 227 } 228 229 void mmc_unregister_bus(void) 230 { 231 bus_unregister(&mmc_bus_type); 232 } 233 234 /** 235 * mmc_register_driver - register a media driver 236 * @drv: MMC media driver 237 */ 238 int mmc_register_driver(struct mmc_driver *drv) 239 { 240 drv->drv.bus = &mmc_bus_type; 241 return driver_register(&drv->drv); 242 } 243 244 EXPORT_SYMBOL(mmc_register_driver); 245 246 /** 247 * mmc_unregister_driver - unregister a media driver 248 * @drv: MMC media driver 249 */ 250 void mmc_unregister_driver(struct mmc_driver *drv) 251 { 252 drv->drv.bus = &mmc_bus_type; 253 driver_unregister(&drv->drv); 254 } 255 256 EXPORT_SYMBOL(mmc_unregister_driver); 257 258 static void mmc_release_card(struct device *dev) 259 { 260 struct mmc_card *card = mmc_dev_to_card(dev); 261 262 sdio_free_common_cis(card); 263 264 kfree(card->info); 265 266 kfree(card); 267 } 268 269 /* 270 * Allocate and initialise a new MMC card structure. 271 */ 272 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 273 { 274 struct mmc_card *card; 275 276 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 277 if (!card) 278 return ERR_PTR(-ENOMEM); 279 280 card->host = host; 281 282 device_initialize(&card->dev); 283 284 card->dev.parent = mmc_classdev(host); 285 card->dev.bus = &mmc_bus_type; 286 card->dev.release = mmc_release_card; 287 card->dev.type = type; 288 289 return card; 290 } 291 292 /* 293 * Register a new MMC card with the driver model. 294 */ 295 int mmc_add_card(struct mmc_card *card) 296 { 297 int ret; 298 const char *type; 299 const char *uhs_bus_speed_mode = ""; 300 static const char *const uhs_speeds[] = { 301 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 302 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 303 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 304 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 305 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 306 }; 307 308 309 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 310 311 switch (card->type) { 312 case MMC_TYPE_MMC: 313 type = "MMC"; 314 break; 315 case MMC_TYPE_SD: 316 type = "SD"; 317 if (mmc_card_blockaddr(card)) { 318 if (mmc_card_ext_capacity(card)) 319 type = "SDXC"; 320 else 321 type = "SDHC"; 322 } 323 break; 324 case MMC_TYPE_SDIO: 325 type = "SDIO"; 326 break; 327 case MMC_TYPE_SD_COMBO: 328 type = "SD-combo"; 329 if (mmc_card_blockaddr(card)) 330 type = "SDHC-combo"; 331 break; 332 default: 333 type = "?"; 334 break; 335 } 336 337 if (mmc_card_uhs(card) && 338 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 339 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 340 341 if (mmc_host_is_spi(card->host)) { 342 pr_info("%s: new %s%s%s card on SPI\n", 343 mmc_hostname(card->host), 344 mmc_card_hs(card) ? "high speed " : "", 345 mmc_card_ddr52(card) ? "DDR " : "", 346 type); 347 } else { 348 pr_info("%s: new %s%s%s%s%s card at address %04x\n", 349 mmc_hostname(card->host), 350 mmc_card_uhs(card) ? "ultra high speed " : 351 (mmc_card_hs(card) ? "high speed " : ""), 352 mmc_card_hs400(card) ? "HS400 " : 353 (mmc_card_hs200(card) ? "HS200 " : ""), 354 mmc_card_ddr52(card) ? "DDR " : "", 355 uhs_bus_speed_mode, type, card->rca); 356 } 357 358 #ifdef CONFIG_DEBUG_FS 359 mmc_add_card_debugfs(card); 360 #endif 361 mmc_init_context_info(card->host); 362 363 ret = device_add(&card->dev); 364 if (ret) 365 return ret; 366 367 mmc_card_set_present(card); 368 369 return 0; 370 } 371 372 /* 373 * Unregister a new MMC card with the driver model, and 374 * (eventually) free it. 375 */ 376 void mmc_remove_card(struct mmc_card *card) 377 { 378 #ifdef CONFIG_DEBUG_FS 379 mmc_remove_card_debugfs(card); 380 #endif 381 382 if (mmc_card_present(card)) { 383 if (mmc_host_is_spi(card->host)) { 384 pr_info("%s: SPI card removed\n", 385 mmc_hostname(card->host)); 386 } else { 387 pr_info("%s: card %04x removed\n", 388 mmc_hostname(card->host), card->rca); 389 } 390 device_del(&card->dev); 391 } 392 393 put_device(&card->dev); 394 } 395 396