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/of.h> 20 #include <linux/pm_runtime.h> 21 22 #include <linux/mmc/card.h> 23 #include <linux/mmc/host.h> 24 25 #include "core.h" 26 #include "card.h" 27 #include "host.h" 28 #include "sdio_cis.h" 29 #include "bus.h" 30 31 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) 32 33 static ssize_t type_show(struct device *dev, 34 struct device_attribute *attr, char *buf) 35 { 36 struct mmc_card *card = mmc_dev_to_card(dev); 37 38 switch (card->type) { 39 case MMC_TYPE_MMC: 40 return sprintf(buf, "MMC\n"); 41 case MMC_TYPE_SD: 42 return sprintf(buf, "SD\n"); 43 case MMC_TYPE_SDIO: 44 return sprintf(buf, "SDIO\n"); 45 case MMC_TYPE_SD_COMBO: 46 return sprintf(buf, "SDcombo\n"); 47 default: 48 return -EFAULT; 49 } 50 } 51 static DEVICE_ATTR_RO(type); 52 53 static struct attribute *mmc_dev_attrs[] = { 54 &dev_attr_type.attr, 55 NULL, 56 }; 57 ATTRIBUTE_GROUPS(mmc_dev); 58 59 /* 60 * This currently matches any MMC driver to any MMC card - drivers 61 * themselves make the decision whether to drive this card in their 62 * probe method. 63 */ 64 static int mmc_bus_match(struct device *dev, struct device_driver *drv) 65 { 66 return 1; 67 } 68 69 static int 70 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 71 { 72 struct mmc_card *card = mmc_dev_to_card(dev); 73 const char *type; 74 int retval = 0; 75 76 switch (card->type) { 77 case MMC_TYPE_MMC: 78 type = "MMC"; 79 break; 80 case MMC_TYPE_SD: 81 type = "SD"; 82 break; 83 case MMC_TYPE_SDIO: 84 type = "SDIO"; 85 break; 86 case MMC_TYPE_SD_COMBO: 87 type = "SDcombo"; 88 break; 89 default: 90 type = NULL; 91 } 92 93 if (type) { 94 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 95 if (retval) 96 return retval; 97 } 98 99 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 100 if (retval) 101 return retval; 102 103 /* 104 * Request the mmc_block device. Note: that this is a direct request 105 * for the module it carries no information as to what is inserted. 106 */ 107 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 108 109 return retval; 110 } 111 112 static int mmc_bus_probe(struct device *dev) 113 { 114 struct mmc_driver *drv = to_mmc_driver(dev->driver); 115 struct mmc_card *card = mmc_dev_to_card(dev); 116 117 return drv->probe(card); 118 } 119 120 static int mmc_bus_remove(struct device *dev) 121 { 122 struct mmc_driver *drv = to_mmc_driver(dev->driver); 123 struct mmc_card *card = mmc_dev_to_card(dev); 124 125 drv->remove(card); 126 127 return 0; 128 } 129 130 static void mmc_bus_shutdown(struct device *dev) 131 { 132 struct mmc_driver *drv = to_mmc_driver(dev->driver); 133 struct mmc_card *card = mmc_dev_to_card(dev); 134 struct mmc_host *host = card->host; 135 int ret; 136 137 if (dev->driver && drv->shutdown) 138 drv->shutdown(card); 139 140 if (host->bus_ops->shutdown) { 141 ret = host->bus_ops->shutdown(host); 142 if (ret) 143 pr_warn("%s: error %d during shutdown\n", 144 mmc_hostname(host), ret); 145 } 146 } 147 148 #ifdef CONFIG_PM_SLEEP 149 static int mmc_bus_suspend(struct device *dev) 150 { 151 struct mmc_card *card = mmc_dev_to_card(dev); 152 struct mmc_host *host = card->host; 153 int ret; 154 155 ret = pm_generic_suspend(dev); 156 if (ret) 157 return ret; 158 159 ret = host->bus_ops->suspend(host); 160 if (ret) 161 pm_generic_resume(dev); 162 163 return ret; 164 } 165 166 static int mmc_bus_resume(struct device *dev) 167 { 168 struct mmc_card *card = mmc_dev_to_card(dev); 169 struct mmc_host *host = card->host; 170 int ret; 171 172 ret = host->bus_ops->resume(host); 173 if (ret) 174 pr_warn("%s: error %d during resume (card was removed?)\n", 175 mmc_hostname(host), ret); 176 177 ret = pm_generic_resume(dev); 178 return ret; 179 } 180 #endif 181 182 #ifdef CONFIG_PM 183 static int mmc_runtime_suspend(struct device *dev) 184 { 185 struct mmc_card *card = mmc_dev_to_card(dev); 186 struct mmc_host *host = card->host; 187 188 return host->bus_ops->runtime_suspend(host); 189 } 190 191 static int mmc_runtime_resume(struct device *dev) 192 { 193 struct mmc_card *card = mmc_dev_to_card(dev); 194 struct mmc_host *host = card->host; 195 196 return host->bus_ops->runtime_resume(host); 197 } 198 #endif /* !CONFIG_PM */ 199 200 static const struct dev_pm_ops mmc_bus_pm_ops = { 201 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL) 202 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 203 }; 204 205 static struct bus_type mmc_bus_type = { 206 .name = "mmc", 207 .dev_groups = mmc_dev_groups, 208 .match = mmc_bus_match, 209 .uevent = mmc_bus_uevent, 210 .probe = mmc_bus_probe, 211 .remove = mmc_bus_remove, 212 .shutdown = mmc_bus_shutdown, 213 .pm = &mmc_bus_pm_ops, 214 }; 215 216 int mmc_register_bus(void) 217 { 218 return bus_register(&mmc_bus_type); 219 } 220 221 void mmc_unregister_bus(void) 222 { 223 bus_unregister(&mmc_bus_type); 224 } 225 226 /** 227 * mmc_register_driver - register a media driver 228 * @drv: MMC media driver 229 */ 230 int mmc_register_driver(struct mmc_driver *drv) 231 { 232 drv->drv.bus = &mmc_bus_type; 233 return driver_register(&drv->drv); 234 } 235 236 EXPORT_SYMBOL(mmc_register_driver); 237 238 /** 239 * mmc_unregister_driver - unregister a media driver 240 * @drv: MMC media driver 241 */ 242 void mmc_unregister_driver(struct mmc_driver *drv) 243 { 244 drv->drv.bus = &mmc_bus_type; 245 driver_unregister(&drv->drv); 246 } 247 248 EXPORT_SYMBOL(mmc_unregister_driver); 249 250 static void mmc_release_card(struct device *dev) 251 { 252 struct mmc_card *card = mmc_dev_to_card(dev); 253 254 sdio_free_common_cis(card); 255 256 kfree(card->info); 257 258 kfree(card); 259 } 260 261 /* 262 * Allocate and initialise a new MMC card structure. 263 */ 264 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 265 { 266 struct mmc_card *card; 267 268 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 269 if (!card) 270 return ERR_PTR(-ENOMEM); 271 272 card->host = host; 273 274 device_initialize(&card->dev); 275 276 card->dev.parent = mmc_classdev(host); 277 card->dev.bus = &mmc_bus_type; 278 card->dev.release = mmc_release_card; 279 card->dev.type = type; 280 281 return card; 282 } 283 284 /* 285 * Register a new MMC card with the driver model. 286 */ 287 int mmc_add_card(struct mmc_card *card) 288 { 289 int ret; 290 const char *type; 291 const char *uhs_bus_speed_mode = ""; 292 static const char *const uhs_speeds[] = { 293 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 294 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 295 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 296 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 297 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 298 }; 299 300 301 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 302 303 switch (card->type) { 304 case MMC_TYPE_MMC: 305 type = "MMC"; 306 break; 307 case MMC_TYPE_SD: 308 type = "SD"; 309 if (mmc_card_blockaddr(card)) { 310 if (mmc_card_ext_capacity(card)) 311 type = "SDXC"; 312 else 313 type = "SDHC"; 314 } 315 break; 316 case MMC_TYPE_SDIO: 317 type = "SDIO"; 318 break; 319 case MMC_TYPE_SD_COMBO: 320 type = "SD-combo"; 321 if (mmc_card_blockaddr(card)) 322 type = "SDHC-combo"; 323 break; 324 default: 325 type = "?"; 326 break; 327 } 328 329 if (mmc_card_uhs(card) && 330 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 331 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 332 333 if (mmc_host_is_spi(card->host)) { 334 pr_info("%s: new %s%s%s card on SPI\n", 335 mmc_hostname(card->host), 336 mmc_card_hs(card) ? "high speed " : "", 337 mmc_card_ddr52(card) ? "DDR " : "", 338 type); 339 } else { 340 pr_info("%s: new %s%s%s%s%s%s card at address %04x\n", 341 mmc_hostname(card->host), 342 mmc_card_uhs(card) ? "ultra high speed " : 343 (mmc_card_hs(card) ? "high speed " : ""), 344 mmc_card_hs400(card) ? "HS400 " : 345 (mmc_card_hs200(card) ? "HS200 " : ""), 346 mmc_card_hs400es(card) ? "Enhanced strobe " : "", 347 mmc_card_ddr52(card) ? "DDR " : "", 348 uhs_bus_speed_mode, type, card->rca); 349 } 350 351 #ifdef CONFIG_DEBUG_FS 352 mmc_add_card_debugfs(card); 353 #endif 354 card->dev.of_node = mmc_of_find_child_device(card->host, 0); 355 356 device_enable_async_suspend(&card->dev); 357 358 ret = device_add(&card->dev); 359 if (ret) 360 return ret; 361 362 mmc_card_set_present(card); 363 364 return 0; 365 } 366 367 /* 368 * Unregister a new MMC card with the driver model, and 369 * (eventually) free it. 370 */ 371 void mmc_remove_card(struct mmc_card *card) 372 { 373 struct mmc_host *host = card->host; 374 375 #ifdef CONFIG_DEBUG_FS 376 mmc_remove_card_debugfs(card); 377 #endif 378 379 if (host->cqe_enabled) { 380 host->cqe_ops->cqe_disable(host); 381 host->cqe_enabled = false; 382 } 383 384 if (mmc_card_present(card)) { 385 if (mmc_host_is_spi(card->host)) { 386 pr_info("%s: SPI card removed\n", 387 mmc_hostname(card->host)); 388 } else { 389 pr_info("%s: card %04x removed\n", 390 mmc_hostname(card->host), card->rca); 391 } 392 device_del(&card->dev); 393 of_node_put(card->dev.of_node); 394 } 395 396 put_device(&card->dev); 397 } 398 399