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