1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/mmc/core/bus.c 4 * 5 * Copyright (C) 2003 Russell King, All Rights Reserved. 6 * Copyright (C) 2007 Pierre Ossman 7 * 8 * MMC card bus driver model 9 */ 10 11 #include <linux/export.h> 12 #include <linux/device.h> 13 #include <linux/err.h> 14 #include <linux/slab.h> 15 #include <linux/stat.h> 16 #include <linux/of.h> 17 #include <linux/pm_runtime.h> 18 19 #include <linux/mmc/card.h> 20 #include <linux/mmc/host.h> 21 22 #include "core.h" 23 #include "card.h" 24 #include "host.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_card *card = mmc_dev_to_card(dev); 149 struct mmc_host *host = card->host; 150 int ret; 151 152 ret = pm_generic_suspend(dev); 153 if (ret) 154 return ret; 155 156 ret = host->bus_ops->suspend(host); 157 if (ret) 158 pm_generic_resume(dev); 159 160 return ret; 161 } 162 163 static int mmc_bus_resume(struct device *dev) 164 { 165 struct mmc_card *card = mmc_dev_to_card(dev); 166 struct mmc_host *host = card->host; 167 int ret; 168 169 ret = host->bus_ops->resume(host); 170 if (ret) 171 pr_warn("%s: error %d during resume (card was removed?)\n", 172 mmc_hostname(host), ret); 173 174 ret = pm_generic_resume(dev); 175 return ret; 176 } 177 #endif 178 179 #ifdef CONFIG_PM 180 static int mmc_runtime_suspend(struct device *dev) 181 { 182 struct mmc_card *card = mmc_dev_to_card(dev); 183 struct mmc_host *host = card->host; 184 185 return host->bus_ops->runtime_suspend(host); 186 } 187 188 static int mmc_runtime_resume(struct device *dev) 189 { 190 struct mmc_card *card = mmc_dev_to_card(dev); 191 struct mmc_host *host = card->host; 192 193 return host->bus_ops->runtime_resume(host); 194 } 195 #endif /* !CONFIG_PM */ 196 197 static const struct dev_pm_ops mmc_bus_pm_ops = { 198 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL) 199 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 200 }; 201 202 static struct bus_type mmc_bus_type = { 203 .name = "mmc", 204 .dev_groups = mmc_dev_groups, 205 .match = mmc_bus_match, 206 .uevent = mmc_bus_uevent, 207 .probe = mmc_bus_probe, 208 .remove = mmc_bus_remove, 209 .shutdown = mmc_bus_shutdown, 210 .pm = &mmc_bus_pm_ops, 211 }; 212 213 int mmc_register_bus(void) 214 { 215 return bus_register(&mmc_bus_type); 216 } 217 218 void mmc_unregister_bus(void) 219 { 220 bus_unregister(&mmc_bus_type); 221 } 222 223 /** 224 * mmc_register_driver - register a media driver 225 * @drv: MMC media driver 226 */ 227 int mmc_register_driver(struct mmc_driver *drv) 228 { 229 drv->drv.bus = &mmc_bus_type; 230 return driver_register(&drv->drv); 231 } 232 233 EXPORT_SYMBOL(mmc_register_driver); 234 235 /** 236 * mmc_unregister_driver - unregister a media driver 237 * @drv: MMC media driver 238 */ 239 void mmc_unregister_driver(struct mmc_driver *drv) 240 { 241 drv->drv.bus = &mmc_bus_type; 242 driver_unregister(&drv->drv); 243 } 244 245 EXPORT_SYMBOL(mmc_unregister_driver); 246 247 static void mmc_release_card(struct device *dev) 248 { 249 struct mmc_card *card = mmc_dev_to_card(dev); 250 251 sdio_free_common_cis(card); 252 253 kfree(card->info); 254 255 kfree(card); 256 } 257 258 /* 259 * Allocate and initialise a new MMC card structure. 260 */ 261 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 262 { 263 struct mmc_card *card; 264 265 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 266 if (!card) 267 return ERR_PTR(-ENOMEM); 268 269 card->host = host; 270 271 device_initialize(&card->dev); 272 273 card->dev.parent = mmc_classdev(host); 274 card->dev.bus = &mmc_bus_type; 275 card->dev.release = mmc_release_card; 276 card->dev.type = type; 277 278 return card; 279 } 280 281 /* 282 * Register a new MMC card with the driver model. 283 */ 284 int mmc_add_card(struct mmc_card *card) 285 { 286 int ret; 287 const char *type; 288 const char *uhs_bus_speed_mode = ""; 289 static const char *const uhs_speeds[] = { 290 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 291 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 292 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 293 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 294 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 295 }; 296 297 298 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 299 300 switch (card->type) { 301 case MMC_TYPE_MMC: 302 type = "MMC"; 303 break; 304 case MMC_TYPE_SD: 305 type = "SD"; 306 if (mmc_card_blockaddr(card)) { 307 if (mmc_card_ext_capacity(card)) 308 type = "SDXC"; 309 else 310 type = "SDHC"; 311 } 312 break; 313 case MMC_TYPE_SDIO: 314 type = "SDIO"; 315 break; 316 case MMC_TYPE_SD_COMBO: 317 type = "SD-combo"; 318 if (mmc_card_blockaddr(card)) 319 type = "SDHC-combo"; 320 break; 321 default: 322 type = "?"; 323 break; 324 } 325 326 if (mmc_card_uhs(card) && 327 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 328 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 329 330 if (mmc_host_is_spi(card->host)) { 331 pr_info("%s: new %s%s%s card on SPI\n", 332 mmc_hostname(card->host), 333 mmc_card_hs(card) ? "high speed " : "", 334 mmc_card_ddr52(card) ? "DDR " : "", 335 type); 336 } else { 337 pr_info("%s: new %s%s%s%s%s%s card at address %04x\n", 338 mmc_hostname(card->host), 339 mmc_card_uhs(card) ? "ultra high speed " : 340 (mmc_card_hs(card) ? "high speed " : ""), 341 mmc_card_hs400(card) ? "HS400 " : 342 (mmc_card_hs200(card) ? "HS200 " : ""), 343 mmc_card_hs400es(card) ? "Enhanced strobe " : "", 344 mmc_card_ddr52(card) ? "DDR " : "", 345 uhs_bus_speed_mode, type, card->rca); 346 } 347 348 #ifdef CONFIG_DEBUG_FS 349 mmc_add_card_debugfs(card); 350 #endif 351 card->dev.of_node = mmc_of_find_child_device(card->host, 0); 352 353 device_enable_async_suspend(&card->dev); 354 355 ret = device_add(&card->dev); 356 if (ret) 357 return ret; 358 359 mmc_card_set_present(card); 360 361 return 0; 362 } 363 364 /* 365 * Unregister a new MMC card with the driver model, and 366 * (eventually) free it. 367 */ 368 void mmc_remove_card(struct mmc_card *card) 369 { 370 struct mmc_host *host = card->host; 371 372 #ifdef CONFIG_DEBUG_FS 373 mmc_remove_card_debugfs(card); 374 #endif 375 376 if (host->cqe_enabled) { 377 host->cqe_ops->cqe_disable(host); 378 host->cqe_enabled = false; 379 } 380 381 if (mmc_card_present(card)) { 382 if (mmc_host_is_spi(card->host)) { 383 pr_info("%s: SPI card removed\n", 384 mmc_hostname(card->host)); 385 } else { 386 pr_info("%s: card %04x removed\n", 387 mmc_hostname(card->host), card->rca); 388 } 389 device_del(&card->dev); 390 of_node_put(card->dev.of_node); 391 } 392 393 put_device(&card->dev); 394 } 395 396