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 static ssize_t type_show(struct device *dev, 30 struct device_attribute *attr, char *buf) 31 { 32 struct mmc_card *card = mmc_dev_to_card(dev); 33 34 switch (card->type) { 35 case MMC_TYPE_MMC: 36 return sprintf(buf, "MMC\n"); 37 case MMC_TYPE_SD: 38 return sprintf(buf, "SD\n"); 39 case MMC_TYPE_SDIO: 40 return sprintf(buf, "SDIO\n"); 41 case MMC_TYPE_SD_COMBO: 42 return sprintf(buf, "SDcombo\n"); 43 default: 44 return -EFAULT; 45 } 46 } 47 static DEVICE_ATTR_RO(type); 48 49 static struct attribute *mmc_dev_attrs[] = { 50 &dev_attr_type.attr, 51 NULL, 52 }; 53 ATTRIBUTE_GROUPS(mmc_dev); 54 55 /* 56 * This currently matches any MMC driver to any MMC card - drivers 57 * themselves make the decision whether to drive this card in their 58 * probe method. 59 */ 60 static int mmc_bus_match(struct device *dev, struct device_driver *drv) 61 { 62 return 1; 63 } 64 65 static int 66 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 67 { 68 struct mmc_card *card = mmc_dev_to_card(dev); 69 const char *type; 70 int retval = 0; 71 72 switch (card->type) { 73 case MMC_TYPE_MMC: 74 type = "MMC"; 75 break; 76 case MMC_TYPE_SD: 77 type = "SD"; 78 break; 79 case MMC_TYPE_SDIO: 80 type = "SDIO"; 81 break; 82 case MMC_TYPE_SD_COMBO: 83 type = "SDcombo"; 84 break; 85 default: 86 type = NULL; 87 } 88 89 if (type) { 90 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 91 if (retval) 92 return retval; 93 } 94 95 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 96 if (retval) 97 return retval; 98 99 /* 100 * Request the mmc_block device. Note: that this is a direct request 101 * for the module it carries no information as to what is inserted. 102 */ 103 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 104 105 return retval; 106 } 107 108 static void mmc_bus_shutdown(struct device *dev) 109 { 110 struct mmc_card *card = mmc_dev_to_card(dev); 111 struct mmc_host *host = card->host; 112 int ret; 113 114 if (dev->driver && dev->driver->shutdown) 115 dev->driver->shutdown(dev); 116 117 if (host->bus_ops->shutdown) { 118 ret = host->bus_ops->shutdown(host); 119 if (ret) 120 pr_warn("%s: error %d during shutdown\n", 121 mmc_hostname(host), ret); 122 } 123 } 124 125 #ifdef CONFIG_PM_SLEEP 126 static int mmc_bus_suspend(struct device *dev) 127 { 128 struct mmc_card *card = mmc_dev_to_card(dev); 129 struct mmc_host *host = card->host; 130 int ret; 131 132 ret = pm_generic_suspend(dev); 133 if (ret) 134 return ret; 135 136 ret = host->bus_ops->suspend(host); 137 return ret; 138 } 139 140 static int mmc_bus_resume(struct device *dev) 141 { 142 struct mmc_card *card = mmc_dev_to_card(dev); 143 struct mmc_host *host = card->host; 144 int ret; 145 146 ret = host->bus_ops->resume(host); 147 if (ret) 148 pr_warn("%s: error %d during resume (card was removed?)\n", 149 mmc_hostname(host), ret); 150 151 ret = pm_generic_resume(dev); 152 return ret; 153 } 154 #endif 155 156 #ifdef CONFIG_PM 157 static int mmc_runtime_suspend(struct device *dev) 158 { 159 struct mmc_card *card = mmc_dev_to_card(dev); 160 struct mmc_host *host = card->host; 161 162 return host->bus_ops->runtime_suspend(host); 163 } 164 165 static int mmc_runtime_resume(struct device *dev) 166 { 167 struct mmc_card *card = mmc_dev_to_card(dev); 168 struct mmc_host *host = card->host; 169 170 return host->bus_ops->runtime_resume(host); 171 } 172 #endif /* !CONFIG_PM */ 173 174 static const struct dev_pm_ops mmc_bus_pm_ops = { 175 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL) 176 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 177 }; 178 179 static struct bus_type mmc_bus_type = { 180 .name = "mmc", 181 .dev_groups = mmc_dev_groups, 182 .match = mmc_bus_match, 183 .uevent = mmc_bus_uevent, 184 .shutdown = mmc_bus_shutdown, 185 .pm = &mmc_bus_pm_ops, 186 }; 187 188 int mmc_register_bus(void) 189 { 190 return bus_register(&mmc_bus_type); 191 } 192 193 void mmc_unregister_bus(void) 194 { 195 bus_unregister(&mmc_bus_type); 196 } 197 198 /** 199 * mmc_register_driver - register a media driver 200 * @drv: MMC media driver 201 */ 202 int mmc_register_driver(struct device_driver *drv) 203 { 204 drv->bus = &mmc_bus_type; 205 return driver_register(drv); 206 } 207 EXPORT_SYMBOL(mmc_register_driver); 208 209 /** 210 * mmc_unregister_driver - unregister a media driver 211 * @drv: MMC media driver 212 */ 213 void mmc_unregister_driver(struct device_driver *drv) 214 { 215 drv->bus = &mmc_bus_type; 216 driver_unregister(drv); 217 } 218 EXPORT_SYMBOL(mmc_unregister_driver); 219 220 static void mmc_release_card(struct device *dev) 221 { 222 struct mmc_card *card = mmc_dev_to_card(dev); 223 224 sdio_free_common_cis(card); 225 226 kfree(card->info); 227 228 kfree(card); 229 } 230 231 /* 232 * Allocate and initialise a new MMC card structure. 233 */ 234 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 235 { 236 struct mmc_card *card; 237 238 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 239 if (!card) 240 return ERR_PTR(-ENOMEM); 241 242 card->host = host; 243 244 device_initialize(&card->dev); 245 246 card->dev.parent = mmc_classdev(host); 247 card->dev.bus = &mmc_bus_type; 248 card->dev.release = mmc_release_card; 249 card->dev.type = type; 250 251 return card; 252 } 253 254 /* 255 * Register a new MMC card with the driver model. 256 */ 257 int mmc_add_card(struct mmc_card *card) 258 { 259 int ret; 260 const char *type; 261 const char *uhs_bus_speed_mode = ""; 262 static const char *const uhs_speeds[] = { 263 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 264 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 265 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 266 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 267 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 268 }; 269 270 271 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 272 273 switch (card->type) { 274 case MMC_TYPE_MMC: 275 type = "MMC"; 276 break; 277 case MMC_TYPE_SD: 278 type = "SD"; 279 if (mmc_card_blockaddr(card)) { 280 if (mmc_card_ext_capacity(card)) 281 type = "SDXC"; 282 else 283 type = "SDHC"; 284 } 285 break; 286 case MMC_TYPE_SDIO: 287 type = "SDIO"; 288 break; 289 case MMC_TYPE_SD_COMBO: 290 type = "SD-combo"; 291 if (mmc_card_blockaddr(card)) 292 type = "SDHC-combo"; 293 break; 294 default: 295 type = "?"; 296 break; 297 } 298 299 if (mmc_card_uhs(card) && 300 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 301 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 302 303 if (mmc_host_is_spi(card->host)) { 304 pr_info("%s: new %s%s%s card on SPI\n", 305 mmc_hostname(card->host), 306 mmc_card_hs(card) ? "high speed " : "", 307 mmc_card_ddr52(card) ? "DDR " : "", 308 type); 309 } else { 310 pr_info("%s: new %s%s%s%s%s card at address %04x\n", 311 mmc_hostname(card->host), 312 mmc_card_uhs(card) ? "ultra high speed " : 313 (mmc_card_hs(card) ? "high speed " : ""), 314 mmc_card_hs400(card) ? "HS400 " : 315 (mmc_card_hs200(card) ? "HS200 " : ""), 316 mmc_card_ddr52(card) ? "DDR " : "", 317 uhs_bus_speed_mode, type, card->rca); 318 } 319 320 #ifdef CONFIG_DEBUG_FS 321 mmc_add_card_debugfs(card); 322 #endif 323 mmc_init_context_info(card->host); 324 325 card->dev.of_node = mmc_of_find_child_device(card->host, 0); 326 327 ret = device_add(&card->dev); 328 if (ret) 329 return ret; 330 331 mmc_card_set_present(card); 332 333 return 0; 334 } 335 336 /* 337 * Unregister a new MMC card with the driver model, and 338 * (eventually) free it. 339 */ 340 void mmc_remove_card(struct mmc_card *card) 341 { 342 #ifdef CONFIG_DEBUG_FS 343 mmc_remove_card_debugfs(card); 344 #endif 345 346 if (mmc_card_present(card)) { 347 if (mmc_host_is_spi(card->host)) { 348 pr_info("%s: SPI card removed\n", 349 mmc_hostname(card->host)); 350 } else { 351 pr_info("%s: card %04x removed\n", 352 mmc_hostname(card->host), card->rca); 353 } 354 device_del(&card->dev); 355 of_node_put(card->dev.of_node); 356 } 357 358 put_device(&card->dev); 359 } 360 361