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