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 unsigned int i; 72 int retval = 0; 73 74 switch (card->type) { 75 case MMC_TYPE_MMC: 76 type = "MMC"; 77 break; 78 case MMC_TYPE_SD: 79 type = "SD"; 80 break; 81 case MMC_TYPE_SDIO: 82 type = "SDIO"; 83 break; 84 case MMC_TYPE_SD_COMBO: 85 type = "SDcombo"; 86 break; 87 default: 88 type = NULL; 89 } 90 91 if (type) { 92 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 93 if (retval) 94 return retval; 95 } 96 97 if (card->type == MMC_TYPE_SDIO || card->type == MMC_TYPE_SD_COMBO) { 98 retval = add_uevent_var(env, "SDIO_ID=%04X:%04X", 99 card->cis.vendor, card->cis.device); 100 if (retval) 101 return retval; 102 103 retval = add_uevent_var(env, "SDIO_REVISION=%u.%u", 104 card->major_rev, card->minor_rev); 105 if (retval) 106 return retval; 107 108 for (i = 0; i < card->num_info; i++) { 109 retval = add_uevent_var(env, "SDIO_INFO%u=%s", i+1, card->info[i]); 110 if (retval) 111 return retval; 112 } 113 } 114 115 /* 116 * SDIO (non-combo) cards are not handled by mmc_block driver and do not 117 * have accessible CID register which used by mmc_card_name() function. 118 */ 119 if (card->type == MMC_TYPE_SDIO) 120 return 0; 121 122 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 123 if (retval) 124 return retval; 125 126 /* 127 * Request the mmc_block device. Note: that this is a direct request 128 * for the module it carries no information as to what is inserted. 129 */ 130 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 131 132 return retval; 133 } 134 135 static int mmc_bus_probe(struct device *dev) 136 { 137 struct mmc_driver *drv = to_mmc_driver(dev->driver); 138 struct mmc_card *card = mmc_dev_to_card(dev); 139 140 return drv->probe(card); 141 } 142 143 static int mmc_bus_remove(struct device *dev) 144 { 145 struct mmc_driver *drv = to_mmc_driver(dev->driver); 146 struct mmc_card *card = mmc_dev_to_card(dev); 147 148 drv->remove(card); 149 150 return 0; 151 } 152 153 static void mmc_bus_shutdown(struct device *dev) 154 { 155 struct mmc_driver *drv = to_mmc_driver(dev->driver); 156 struct mmc_card *card = mmc_dev_to_card(dev); 157 struct mmc_host *host = card->host; 158 int ret; 159 160 if (dev->driver && drv->shutdown) 161 drv->shutdown(card); 162 163 if (host->bus_ops->shutdown) { 164 ret = host->bus_ops->shutdown(host); 165 if (ret) 166 pr_warn("%s: error %d during shutdown\n", 167 mmc_hostname(host), ret); 168 } 169 } 170 171 #ifdef CONFIG_PM_SLEEP 172 static int mmc_bus_suspend(struct device *dev) 173 { 174 struct mmc_card *card = mmc_dev_to_card(dev); 175 struct mmc_host *host = card->host; 176 int ret; 177 178 ret = pm_generic_suspend(dev); 179 if (ret) 180 return ret; 181 182 ret = host->bus_ops->suspend(host); 183 if (ret) 184 pm_generic_resume(dev); 185 186 return ret; 187 } 188 189 static int mmc_bus_resume(struct device *dev) 190 { 191 struct mmc_card *card = mmc_dev_to_card(dev); 192 struct mmc_host *host = card->host; 193 int ret; 194 195 ret = host->bus_ops->resume(host); 196 if (ret) 197 pr_warn("%s: error %d during resume (card was removed?)\n", 198 mmc_hostname(host), ret); 199 200 ret = pm_generic_resume(dev); 201 return ret; 202 } 203 #endif 204 205 #ifdef CONFIG_PM 206 static int mmc_runtime_suspend(struct device *dev) 207 { 208 struct mmc_card *card = mmc_dev_to_card(dev); 209 struct mmc_host *host = card->host; 210 211 return host->bus_ops->runtime_suspend(host); 212 } 213 214 static int mmc_runtime_resume(struct device *dev) 215 { 216 struct mmc_card *card = mmc_dev_to_card(dev); 217 struct mmc_host *host = card->host; 218 219 return host->bus_ops->runtime_resume(host); 220 } 221 #endif /* !CONFIG_PM */ 222 223 static const struct dev_pm_ops mmc_bus_pm_ops = { 224 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL) 225 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 226 }; 227 228 static struct bus_type mmc_bus_type = { 229 .name = "mmc", 230 .dev_groups = mmc_dev_groups, 231 .match = mmc_bus_match, 232 .uevent = mmc_bus_uevent, 233 .probe = mmc_bus_probe, 234 .remove = mmc_bus_remove, 235 .shutdown = mmc_bus_shutdown, 236 .pm = &mmc_bus_pm_ops, 237 }; 238 239 int mmc_register_bus(void) 240 { 241 return bus_register(&mmc_bus_type); 242 } 243 244 void mmc_unregister_bus(void) 245 { 246 bus_unregister(&mmc_bus_type); 247 } 248 249 /** 250 * mmc_register_driver - register a media driver 251 * @drv: MMC media driver 252 */ 253 int mmc_register_driver(struct mmc_driver *drv) 254 { 255 drv->drv.bus = &mmc_bus_type; 256 return driver_register(&drv->drv); 257 } 258 259 EXPORT_SYMBOL(mmc_register_driver); 260 261 /** 262 * mmc_unregister_driver - unregister a media driver 263 * @drv: MMC media driver 264 */ 265 void mmc_unregister_driver(struct mmc_driver *drv) 266 { 267 drv->drv.bus = &mmc_bus_type; 268 driver_unregister(&drv->drv); 269 } 270 271 EXPORT_SYMBOL(mmc_unregister_driver); 272 273 static void mmc_release_card(struct device *dev) 274 { 275 struct mmc_card *card = mmc_dev_to_card(dev); 276 277 sdio_free_common_cis(card); 278 279 kfree(card->info); 280 281 kfree(card); 282 } 283 284 /* 285 * Allocate and initialise a new MMC card structure. 286 */ 287 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 288 { 289 struct mmc_card *card; 290 291 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 292 if (!card) 293 return ERR_PTR(-ENOMEM); 294 295 card->host = host; 296 297 device_initialize(&card->dev); 298 299 card->dev.parent = mmc_classdev(host); 300 card->dev.bus = &mmc_bus_type; 301 card->dev.release = mmc_release_card; 302 card->dev.type = type; 303 304 return card; 305 } 306 307 /* 308 * Register a new MMC card with the driver model. 309 */ 310 int mmc_add_card(struct mmc_card *card) 311 { 312 int ret; 313 const char *type; 314 const char *uhs_bus_speed_mode = ""; 315 static const char *const uhs_speeds[] = { 316 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 317 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 318 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 319 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 320 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 321 }; 322 323 324 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 325 326 switch (card->type) { 327 case MMC_TYPE_MMC: 328 type = "MMC"; 329 break; 330 case MMC_TYPE_SD: 331 type = "SD"; 332 if (mmc_card_blockaddr(card)) { 333 if (mmc_card_ext_capacity(card)) 334 type = "SDXC"; 335 else 336 type = "SDHC"; 337 } 338 break; 339 case MMC_TYPE_SDIO: 340 type = "SDIO"; 341 break; 342 case MMC_TYPE_SD_COMBO: 343 type = "SD-combo"; 344 if (mmc_card_blockaddr(card)) 345 type = "SDHC-combo"; 346 break; 347 default: 348 type = "?"; 349 break; 350 } 351 352 if (mmc_card_uhs(card) && 353 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 354 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 355 356 if (mmc_host_is_spi(card->host)) { 357 pr_info("%s: new %s%s%s card on SPI\n", 358 mmc_hostname(card->host), 359 mmc_card_hs(card) ? "high speed " : "", 360 mmc_card_ddr52(card) ? "DDR " : "", 361 type); 362 } else { 363 pr_info("%s: new %s%s%s%s%s%s card at address %04x\n", 364 mmc_hostname(card->host), 365 mmc_card_uhs(card) ? "ultra high speed " : 366 (mmc_card_hs(card) ? "high speed " : ""), 367 mmc_card_hs400(card) ? "HS400 " : 368 (mmc_card_hs200(card) ? "HS200 " : ""), 369 mmc_card_hs400es(card) ? "Enhanced strobe " : "", 370 mmc_card_ddr52(card) ? "DDR " : "", 371 uhs_bus_speed_mode, type, card->rca); 372 } 373 374 #ifdef CONFIG_DEBUG_FS 375 mmc_add_card_debugfs(card); 376 #endif 377 card->dev.of_node = mmc_of_find_child_device(card->host, 0); 378 379 device_enable_async_suspend(&card->dev); 380 381 ret = device_add(&card->dev); 382 if (ret) 383 return ret; 384 385 mmc_card_set_present(card); 386 387 return 0; 388 } 389 390 /* 391 * Unregister a new MMC card with the driver model, and 392 * (eventually) free it. 393 */ 394 void mmc_remove_card(struct mmc_card *card) 395 { 396 struct mmc_host *host = card->host; 397 398 #ifdef CONFIG_DEBUG_FS 399 mmc_remove_card_debugfs(card); 400 #endif 401 402 if (mmc_card_present(card)) { 403 if (mmc_host_is_spi(card->host)) { 404 pr_info("%s: SPI card removed\n", 405 mmc_hostname(card->host)); 406 } else { 407 pr_info("%s: card %04x removed\n", 408 mmc_hostname(card->host), card->rca); 409 } 410 device_del(&card->dev); 411 of_node_put(card->dev.of_node); 412 } 413 414 if (host->cqe_enabled) { 415 host->cqe_ops->cqe_disable(host); 416 host->cqe_enabled = false; 417 } 418 419 put_device(&card->dev); 420 } 421