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/pm_runtime.h> 20 21 #include <linux/mmc/card.h> 22 #include <linux/mmc/host.h> 23 24 #include "core.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 mmc_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 49 static struct device_attribute mmc_dev_attrs[] = { 50 __ATTR(type, S_IRUGO, mmc_type_show, NULL), 51 __ATTR_NULL, 52 }; 53 54 /* 55 * This currently matches any MMC driver to any MMC card - drivers 56 * themselves make the decision whether to drive this card in their 57 * probe method. 58 */ 59 static int mmc_bus_match(struct device *dev, struct device_driver *drv) 60 { 61 return 1; 62 } 63 64 static int 65 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 66 { 67 struct mmc_card *card = mmc_dev_to_card(dev); 68 const char *type; 69 int retval = 0; 70 71 switch (card->type) { 72 case MMC_TYPE_MMC: 73 type = "MMC"; 74 break; 75 case MMC_TYPE_SD: 76 type = "SD"; 77 break; 78 case MMC_TYPE_SDIO: 79 type = "SDIO"; 80 break; 81 case MMC_TYPE_SD_COMBO: 82 type = "SDcombo"; 83 break; 84 default: 85 type = NULL; 86 } 87 88 if (type) { 89 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 90 if (retval) 91 return retval; 92 } 93 94 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 95 if (retval) 96 return retval; 97 98 /* 99 * Request the mmc_block device. Note: that this is a direct request 100 * for the module it carries no information as to what is inserted. 101 */ 102 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 103 104 return retval; 105 } 106 107 static int mmc_bus_probe(struct device *dev) 108 { 109 struct mmc_driver *drv = to_mmc_driver(dev->driver); 110 struct mmc_card *card = mmc_dev_to_card(dev); 111 112 return drv->probe(card); 113 } 114 115 static int mmc_bus_remove(struct device *dev) 116 { 117 struct mmc_driver *drv = to_mmc_driver(dev->driver); 118 struct mmc_card *card = mmc_dev_to_card(dev); 119 120 drv->remove(card); 121 122 return 0; 123 } 124 125 #ifdef CONFIG_PM_SLEEP 126 static int mmc_bus_suspend(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 int ret = 0; 131 132 if (dev->driver && drv->suspend) 133 ret = drv->suspend(card); 134 return ret; 135 } 136 137 static int mmc_bus_resume(struct device *dev) 138 { 139 struct mmc_driver *drv = to_mmc_driver(dev->driver); 140 struct mmc_card *card = mmc_dev_to_card(dev); 141 int ret = 0; 142 143 if (dev->driver && drv->resume) 144 ret = drv->resume(card); 145 return ret; 146 } 147 #endif 148 149 #ifdef CONFIG_PM_RUNTIME 150 151 static int mmc_runtime_suspend(struct device *dev) 152 { 153 struct mmc_card *card = mmc_dev_to_card(dev); 154 155 return mmc_power_save_host(card->host); 156 } 157 158 static int mmc_runtime_resume(struct device *dev) 159 { 160 struct mmc_card *card = mmc_dev_to_card(dev); 161 162 return mmc_power_restore_host(card->host); 163 } 164 165 static int mmc_runtime_idle(struct device *dev) 166 { 167 return pm_runtime_suspend(dev); 168 } 169 170 #endif /* !CONFIG_PM_RUNTIME */ 171 172 static const struct dev_pm_ops mmc_bus_pm_ops = { 173 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, 174 mmc_runtime_idle) 175 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 176 }; 177 178 static struct bus_type mmc_bus_type = { 179 .name = "mmc", 180 .dev_attrs = mmc_dev_attrs, 181 .match = mmc_bus_match, 182 .uevent = mmc_bus_uevent, 183 .probe = mmc_bus_probe, 184 .remove = mmc_bus_remove, 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 mmc_driver *drv) 203 { 204 drv->drv.bus = &mmc_bus_type; 205 return driver_register(&drv->drv); 206 } 207 208 EXPORT_SYMBOL(mmc_register_driver); 209 210 /** 211 * mmc_unregister_driver - unregister a media driver 212 * @drv: MMC media driver 213 */ 214 void mmc_unregister_driver(struct mmc_driver *drv) 215 { 216 drv->drv.bus = &mmc_bus_type; 217 driver_unregister(&drv->drv); 218 } 219 220 EXPORT_SYMBOL(mmc_unregister_driver); 221 222 static void mmc_release_card(struct device *dev) 223 { 224 struct mmc_card *card = mmc_dev_to_card(dev); 225 226 sdio_free_common_cis(card); 227 228 if (card->info) 229 kfree(card->info); 230 231 kfree(card); 232 } 233 234 /* 235 * Allocate and initialise a new MMC card structure. 236 */ 237 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 238 { 239 struct mmc_card *card; 240 241 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 242 if (!card) 243 return ERR_PTR(-ENOMEM); 244 245 card->host = host; 246 247 device_initialize(&card->dev); 248 249 card->dev.parent = mmc_classdev(host); 250 card->dev.bus = &mmc_bus_type; 251 card->dev.release = mmc_release_card; 252 card->dev.type = type; 253 254 return card; 255 } 256 257 /* 258 * Register a new MMC card with the driver model. 259 */ 260 int mmc_add_card(struct mmc_card *card) 261 { 262 int ret; 263 const char *type; 264 const char *uhs_bus_speed_mode = ""; 265 static const char *const uhs_speeds[] = { 266 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 267 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 268 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 269 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 270 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 271 }; 272 273 274 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 275 276 switch (card->type) { 277 case MMC_TYPE_MMC: 278 type = "MMC"; 279 break; 280 case MMC_TYPE_SD: 281 type = "SD"; 282 if (mmc_card_blockaddr(card)) { 283 if (mmc_card_ext_capacity(card)) 284 type = "SDXC"; 285 else 286 type = "SDHC"; 287 } 288 break; 289 case MMC_TYPE_SDIO: 290 type = "SDIO"; 291 break; 292 case MMC_TYPE_SD_COMBO: 293 type = "SD-combo"; 294 if (mmc_card_blockaddr(card)) 295 type = "SDHC-combo"; 296 break; 297 default: 298 type = "?"; 299 break; 300 } 301 302 if (mmc_sd_card_uhs(card) && 303 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 304 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 305 306 if (mmc_host_is_spi(card->host)) { 307 pr_info("%s: new %s%s%s card on SPI\n", 308 mmc_hostname(card->host), 309 mmc_card_highspeed(card) ? "high speed " : "", 310 mmc_card_ddr_mode(card) ? "DDR " : "", 311 type); 312 } else { 313 pr_info("%s: new %s%s%s%s%s card at address %04x\n", 314 mmc_hostname(card->host), 315 mmc_card_uhs(card) ? "ultra high speed " : 316 (mmc_card_highspeed(card) ? "high speed " : ""), 317 (mmc_card_hs200(card) ? "HS200 " : ""), 318 mmc_card_ddr_mode(card) ? "DDR " : "", 319 uhs_bus_speed_mode, type, card->rca); 320 } 321 322 #ifdef CONFIG_DEBUG_FS 323 mmc_add_card_debugfs(card); 324 #endif 325 326 ret = device_add(&card->dev); 327 if (ret) 328 return ret; 329 330 mmc_card_set_present(card); 331 332 return 0; 333 } 334 335 /* 336 * Unregister a new MMC card with the driver model, and 337 * (eventually) free it. 338 */ 339 void mmc_remove_card(struct mmc_card *card) 340 { 341 #ifdef CONFIG_DEBUG_FS 342 mmc_remove_card_debugfs(card); 343 #endif 344 345 if (mmc_card_present(card)) { 346 if (mmc_host_is_spi(card->host)) { 347 pr_info("%s: SPI card removed\n", 348 mmc_hostname(card->host)); 349 } else { 350 pr_info("%s: card %04x removed\n", 351 mmc_hostname(card->host), card->rca); 352 } 353 device_del(&card->dev); 354 } 355 356 put_device(&card->dev); 357 } 358 359