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 #include <linux/sysfs.h> 19 20 #include <linux/mmc/card.h> 21 #include <linux/mmc/host.h> 22 23 #include "core.h" 24 #include "card.h" 25 #include "host.h" 26 #include "sdio_cis.h" 27 #include "bus.h" 28 29 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) 30 31 static ssize_t type_show(struct device *dev, 32 struct device_attribute *attr, char *buf) 33 { 34 struct mmc_card *card = mmc_dev_to_card(dev); 35 36 switch (card->type) { 37 case MMC_TYPE_MMC: 38 return sysfs_emit(buf, "MMC\n"); 39 case MMC_TYPE_SD: 40 return sysfs_emit(buf, "SD\n"); 41 case MMC_TYPE_SDIO: 42 return sysfs_emit(buf, "SDIO\n"); 43 case MMC_TYPE_SD_COMBO: 44 return sysfs_emit(buf, "SDcombo\n"); 45 default: 46 return -EFAULT; 47 } 48 } 49 static DEVICE_ATTR_RO(type); 50 51 static struct attribute *mmc_dev_attrs[] = { 52 &dev_attr_type.attr, 53 NULL, 54 }; 55 ATTRIBUTE_GROUPS(mmc_dev); 56 57 static int 58 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 59 { 60 struct mmc_card *card = mmc_dev_to_card(dev); 61 const char *type; 62 unsigned int i; 63 int retval = 0; 64 65 switch (card->type) { 66 case MMC_TYPE_MMC: 67 type = "MMC"; 68 break; 69 case MMC_TYPE_SD: 70 type = "SD"; 71 break; 72 case MMC_TYPE_SDIO: 73 type = "SDIO"; 74 break; 75 case MMC_TYPE_SD_COMBO: 76 type = "SDcombo"; 77 break; 78 default: 79 type = NULL; 80 } 81 82 if (type) { 83 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 84 if (retval) 85 return retval; 86 } 87 88 if (card->type == MMC_TYPE_SDIO || card->type == MMC_TYPE_SD_COMBO) { 89 retval = add_uevent_var(env, "SDIO_ID=%04X:%04X", 90 card->cis.vendor, card->cis.device); 91 if (retval) 92 return retval; 93 94 retval = add_uevent_var(env, "SDIO_REVISION=%u.%u", 95 card->major_rev, card->minor_rev); 96 if (retval) 97 return retval; 98 99 for (i = 0; i < card->num_info; i++) { 100 retval = add_uevent_var(env, "SDIO_INFO%u=%s", i+1, card->info[i]); 101 if (retval) 102 return retval; 103 } 104 } 105 106 /* 107 * SDIO (non-combo) cards are not handled by mmc_block driver and do not 108 * have accessible CID register which used by mmc_card_name() function. 109 */ 110 if (card->type == MMC_TYPE_SDIO) 111 return 0; 112 113 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 114 if (retval) 115 return retval; 116 117 /* 118 * Request the mmc_block device. Note: that this is a direct request 119 * for the module it carries no information as to what is inserted. 120 */ 121 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 122 123 return retval; 124 } 125 126 static int mmc_bus_probe(struct device *dev) 127 { 128 struct mmc_driver *drv = to_mmc_driver(dev->driver); 129 struct mmc_card *card = mmc_dev_to_card(dev); 130 131 return drv->probe(card); 132 } 133 134 static void mmc_bus_remove(struct device *dev) 135 { 136 struct mmc_driver *drv = to_mmc_driver(dev->driver); 137 struct mmc_card *card = mmc_dev_to_card(dev); 138 139 drv->remove(card); 140 } 141 142 static void mmc_bus_shutdown(struct device *dev) 143 { 144 struct mmc_driver *drv = to_mmc_driver(dev->driver); 145 struct mmc_card *card = mmc_dev_to_card(dev); 146 struct mmc_host *host = card->host; 147 int ret; 148 149 if (dev->driver && drv->shutdown) 150 drv->shutdown(card); 151 152 if (host->bus_ops->shutdown) { 153 ret = host->bus_ops->shutdown(host); 154 if (ret) 155 pr_warn("%s: error %d during shutdown\n", 156 mmc_hostname(host), ret); 157 } 158 } 159 160 #ifdef CONFIG_PM_SLEEP 161 static int mmc_bus_suspend(struct device *dev) 162 { 163 struct mmc_card *card = mmc_dev_to_card(dev); 164 struct mmc_host *host = card->host; 165 int ret; 166 167 ret = pm_generic_suspend(dev); 168 if (ret) 169 return ret; 170 171 ret = host->bus_ops->suspend(host); 172 if (ret) 173 pm_generic_resume(dev); 174 175 return ret; 176 } 177 178 static int mmc_bus_resume(struct device *dev) 179 { 180 struct mmc_card *card = mmc_dev_to_card(dev); 181 struct mmc_host *host = card->host; 182 int ret; 183 184 ret = host->bus_ops->resume(host); 185 if (ret) 186 pr_warn("%s: error %d during resume (card was removed?)\n", 187 mmc_hostname(host), ret); 188 189 ret = pm_generic_resume(dev); 190 return ret; 191 } 192 #endif 193 194 #ifdef CONFIG_PM 195 static int mmc_runtime_suspend(struct device *dev) 196 { 197 struct mmc_card *card = mmc_dev_to_card(dev); 198 struct mmc_host *host = card->host; 199 200 return host->bus_ops->runtime_suspend(host); 201 } 202 203 static int mmc_runtime_resume(struct device *dev) 204 { 205 struct mmc_card *card = mmc_dev_to_card(dev); 206 struct mmc_host *host = card->host; 207 208 return host->bus_ops->runtime_resume(host); 209 } 210 #endif /* !CONFIG_PM */ 211 212 static const struct dev_pm_ops mmc_bus_pm_ops = { 213 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL) 214 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 215 }; 216 217 static struct bus_type mmc_bus_type = { 218 .name = "mmc", 219 .dev_groups = mmc_dev_groups, 220 .uevent = mmc_bus_uevent, 221 .probe = mmc_bus_probe, 222 .remove = mmc_bus_remove, 223 .shutdown = mmc_bus_shutdown, 224 .pm = &mmc_bus_pm_ops, 225 }; 226 227 int mmc_register_bus(void) 228 { 229 return bus_register(&mmc_bus_type); 230 } 231 232 void mmc_unregister_bus(void) 233 { 234 bus_unregister(&mmc_bus_type); 235 } 236 237 /** 238 * mmc_register_driver - register a media driver 239 * @drv: MMC media driver 240 */ 241 int mmc_register_driver(struct mmc_driver *drv) 242 { 243 drv->drv.bus = &mmc_bus_type; 244 return driver_register(&drv->drv); 245 } 246 247 EXPORT_SYMBOL(mmc_register_driver); 248 249 /** 250 * mmc_unregister_driver - unregister a media driver 251 * @drv: MMC media driver 252 */ 253 void mmc_unregister_driver(struct mmc_driver *drv) 254 { 255 drv->drv.bus = &mmc_bus_type; 256 driver_unregister(&drv->drv); 257 } 258 259 EXPORT_SYMBOL(mmc_unregister_driver); 260 261 static void mmc_release_card(struct device *dev) 262 { 263 struct mmc_card *card = mmc_dev_to_card(dev); 264 265 sdio_free_common_cis(card); 266 267 kfree(card->info); 268 269 kfree(card); 270 } 271 272 /* 273 * Allocate and initialise a new MMC card structure. 274 */ 275 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 276 { 277 struct mmc_card *card; 278 279 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 280 if (!card) 281 return ERR_PTR(-ENOMEM); 282 283 card->host = host; 284 285 device_initialize(&card->dev); 286 287 card->dev.parent = mmc_classdev(host); 288 card->dev.bus = &mmc_bus_type; 289 card->dev.release = mmc_release_card; 290 card->dev.type = type; 291 292 return card; 293 } 294 295 /* 296 * Register a new MMC card with the driver model. 297 */ 298 int mmc_add_card(struct mmc_card *card) 299 { 300 int ret; 301 const char *type; 302 const char *uhs_bus_speed_mode = ""; 303 static const char *const uhs_speeds[] = { 304 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 305 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 306 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 307 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 308 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 309 }; 310 311 312 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 313 314 switch (card->type) { 315 case MMC_TYPE_MMC: 316 type = "MMC"; 317 break; 318 case MMC_TYPE_SD: 319 type = "SD"; 320 if (mmc_card_blockaddr(card)) { 321 if (mmc_card_ext_capacity(card)) 322 type = "SDXC"; 323 else 324 type = "SDHC"; 325 } 326 break; 327 case MMC_TYPE_SDIO: 328 type = "SDIO"; 329 break; 330 case MMC_TYPE_SD_COMBO: 331 type = "SD-combo"; 332 if (mmc_card_blockaddr(card)) 333 type = "SDHC-combo"; 334 break; 335 default: 336 type = "?"; 337 break; 338 } 339 340 if (mmc_card_uhs(card) && 341 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 342 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 343 344 if (mmc_host_is_spi(card->host)) { 345 pr_info("%s: new %s%s%s card on SPI\n", 346 mmc_hostname(card->host), 347 mmc_card_hs(card) ? "high speed " : "", 348 mmc_card_ddr52(card) ? "DDR " : "", 349 type); 350 } else { 351 pr_info("%s: new %s%s%s%s%s%s card at address %04x\n", 352 mmc_hostname(card->host), 353 mmc_card_uhs(card) ? "ultra high speed " : 354 (mmc_card_hs(card) ? "high speed " : ""), 355 mmc_card_hs400(card) ? "HS400 " : 356 (mmc_card_hs200(card) ? "HS200 " : ""), 357 mmc_card_hs400es(card) ? "Enhanced strobe " : "", 358 mmc_card_ddr52(card) ? "DDR " : "", 359 uhs_bus_speed_mode, type, card->rca); 360 } 361 362 #ifdef CONFIG_DEBUG_FS 363 mmc_add_card_debugfs(card); 364 #endif 365 card->dev.of_node = mmc_of_find_child_device(card->host, 0); 366 367 device_enable_async_suspend(&card->dev); 368 369 ret = device_add(&card->dev); 370 if (ret) 371 return ret; 372 373 mmc_card_set_present(card); 374 375 return 0; 376 } 377 378 /* 379 * Unregister a new MMC card with the driver model, and 380 * (eventually) free it. 381 */ 382 void mmc_remove_card(struct mmc_card *card) 383 { 384 struct mmc_host *host = card->host; 385 386 #ifdef CONFIG_DEBUG_FS 387 mmc_remove_card_debugfs(card); 388 #endif 389 390 if (mmc_card_present(card)) { 391 if (mmc_host_is_spi(card->host)) { 392 pr_info("%s: SPI card removed\n", 393 mmc_hostname(card->host)); 394 } else { 395 pr_info("%s: card %04x removed\n", 396 mmc_hostname(card->host), card->rca); 397 } 398 device_del(&card->dev); 399 of_node_put(card->dev.of_node); 400 } 401 402 if (host->cqe_enabled) { 403 host->cqe_ops->cqe_disable(host); 404 host->cqe_enabled = false; 405 } 406 407 put_device(&card->dev); 408 } 409