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 static int mmc_bus_suspend(struct device *dev, pm_message_t state) 126 { 127 struct mmc_driver *drv = to_mmc_driver(dev->driver); 128 struct mmc_card *card = mmc_dev_to_card(dev); 129 int ret = 0; 130 131 if (dev->driver && drv->suspend) 132 ret = drv->suspend(card, state); 133 return ret; 134 } 135 136 static int mmc_bus_resume(struct device *dev) 137 { 138 struct mmc_driver *drv = to_mmc_driver(dev->driver); 139 struct mmc_card *card = mmc_dev_to_card(dev); 140 int ret = 0; 141 142 if (dev->driver && drv->resume) 143 ret = drv->resume(card); 144 return ret; 145 } 146 147 #ifdef CONFIG_PM_RUNTIME 148 149 static int mmc_runtime_suspend(struct device *dev) 150 { 151 struct mmc_card *card = mmc_dev_to_card(dev); 152 153 return mmc_power_save_host(card->host); 154 } 155 156 static int mmc_runtime_resume(struct device *dev) 157 { 158 struct mmc_card *card = mmc_dev_to_card(dev); 159 160 return mmc_power_restore_host(card->host); 161 } 162 163 static int mmc_runtime_idle(struct device *dev) 164 { 165 return pm_runtime_suspend(dev); 166 } 167 168 static const struct dev_pm_ops mmc_bus_pm_ops = { 169 .runtime_suspend = mmc_runtime_suspend, 170 .runtime_resume = mmc_runtime_resume, 171 .runtime_idle = mmc_runtime_idle, 172 }; 173 174 #define MMC_PM_OPS_PTR (&mmc_bus_pm_ops) 175 176 #else /* !CONFIG_PM_RUNTIME */ 177 178 #define MMC_PM_OPS_PTR NULL 179 180 #endif /* !CONFIG_PM_RUNTIME */ 181 182 static struct bus_type mmc_bus_type = { 183 .name = "mmc", 184 .dev_attrs = mmc_dev_attrs, 185 .match = mmc_bus_match, 186 .uevent = mmc_bus_uevent, 187 .probe = mmc_bus_probe, 188 .remove = mmc_bus_remove, 189 .suspend = mmc_bus_suspend, 190 .resume = mmc_bus_resume, 191 .pm = MMC_PM_OPS_PTR, 192 }; 193 194 int mmc_register_bus(void) 195 { 196 return bus_register(&mmc_bus_type); 197 } 198 199 void mmc_unregister_bus(void) 200 { 201 bus_unregister(&mmc_bus_type); 202 } 203 204 /** 205 * mmc_register_driver - register a media driver 206 * @drv: MMC media driver 207 */ 208 int mmc_register_driver(struct mmc_driver *drv) 209 { 210 drv->drv.bus = &mmc_bus_type; 211 return driver_register(&drv->drv); 212 } 213 214 EXPORT_SYMBOL(mmc_register_driver); 215 216 /** 217 * mmc_unregister_driver - unregister a media driver 218 * @drv: MMC media driver 219 */ 220 void mmc_unregister_driver(struct mmc_driver *drv) 221 { 222 drv->drv.bus = &mmc_bus_type; 223 driver_unregister(&drv->drv); 224 } 225 226 EXPORT_SYMBOL(mmc_unregister_driver); 227 228 static void mmc_release_card(struct device *dev) 229 { 230 struct mmc_card *card = mmc_dev_to_card(dev); 231 232 sdio_free_common_cis(card); 233 234 if (card->info) 235 kfree(card->info); 236 237 kfree(card); 238 } 239 240 /* 241 * Allocate and initialise a new MMC card structure. 242 */ 243 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 244 { 245 struct mmc_card *card; 246 247 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 248 if (!card) 249 return ERR_PTR(-ENOMEM); 250 251 card->host = host; 252 253 device_initialize(&card->dev); 254 255 card->dev.parent = mmc_classdev(host); 256 card->dev.bus = &mmc_bus_type; 257 card->dev.release = mmc_release_card; 258 card->dev.type = type; 259 260 return card; 261 } 262 263 /* 264 * Register a new MMC card with the driver model. 265 */ 266 int mmc_add_card(struct mmc_card *card) 267 { 268 int ret; 269 const char *type; 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_host_is_spi(card->host)) { 300 pr_info("%s: new %s%s%s card on SPI\n", 301 mmc_hostname(card->host), 302 mmc_card_highspeed(card) ? "high speed " : "", 303 mmc_card_ddr_mode(card) ? "DDR " : "", 304 type); 305 } else { 306 printk(KERN_INFO "%s: new %s%s%s card at address %04x\n", 307 mmc_hostname(card->host), 308 mmc_sd_card_uhs(card) ? "ultra high speed " : 309 (mmc_card_highspeed(card) ? "high speed " : ""), 310 mmc_card_ddr_mode(card) ? "DDR " : "", 311 type, card->rca); 312 } 313 314 #ifdef CONFIG_DEBUG_FS 315 mmc_add_card_debugfs(card); 316 #endif 317 318 ret = device_add(&card->dev); 319 if (ret) 320 return ret; 321 322 mmc_card_set_present(card); 323 324 return 0; 325 } 326 327 /* 328 * Unregister a new MMC card with the driver model, and 329 * (eventually) free it. 330 */ 331 void mmc_remove_card(struct mmc_card *card) 332 { 333 #ifdef CONFIG_DEBUG_FS 334 mmc_remove_card_debugfs(card); 335 #endif 336 337 if (mmc_card_present(card)) { 338 if (mmc_host_is_spi(card->host)) { 339 pr_info("%s: SPI card removed\n", 340 mmc_hostname(card->host)); 341 } else { 342 pr_info("%s: card %04x removed\n", 343 mmc_hostname(card->host), card->rca); 344 } 345 device_del(&card->dev); 346 } 347 348 put_device(&card->dev); 349 } 350 351