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 30static 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 49static 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 */ 59static int mmc_bus_match(struct device *dev, struct device_driver *drv) 60{ 61 return 1; 62} 63 64static int 65mmc_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 107static 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 115static 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 125static int mmc_bus_pm_suspend(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 int ret = 0; 130 pm_message_t state = { PM_EVENT_SUSPEND }; 131 132 if (dev->driver && drv->suspend) 133 ret = drv->suspend(card, state); 134 return ret; 135} 136 137static int mmc_bus_pm_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} 147 148#ifdef CONFIG_PM_RUNTIME 149static 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 156static 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 163static int mmc_runtime_idle(struct device *dev) 164{ 165 return pm_runtime_suspend(dev); 166} 167#endif /* CONFIG_PM_RUNTIME */ 168 169static const struct dev_pm_ops mmc_bus_pm_ops = { 170 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_pm_suspend, mmc_bus_pm_resume) 171 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, mmc_runtime_idle) 172}; 173 174static struct bus_type mmc_bus_type = { 175 .name = "mmc", 176 .dev_attrs = mmc_dev_attrs, 177 .match = mmc_bus_match, 178 .uevent = mmc_bus_uevent, 179 .probe = mmc_bus_probe, 180 .remove = mmc_bus_remove, 181 .pm = &mmc_bus_pm_ops, 182}; 183 184int mmc_register_bus(void) 185{ 186 return bus_register(&mmc_bus_type); 187} 188 189void mmc_unregister_bus(void) 190{ 191 bus_unregister(&mmc_bus_type); 192} 193 194/** 195 * mmc_register_driver - register a media driver 196 * @drv: MMC media driver 197 */ 198int mmc_register_driver(struct mmc_driver *drv) 199{ 200 drv->drv.bus = &mmc_bus_type; 201 return driver_register(&drv->drv); 202} 203 204EXPORT_SYMBOL(mmc_register_driver); 205 206/** 207 * mmc_unregister_driver - unregister a media driver 208 * @drv: MMC media driver 209 */ 210void mmc_unregister_driver(struct mmc_driver *drv) 211{ 212 drv->drv.bus = &mmc_bus_type; 213 driver_unregister(&drv->drv); 214} 215 216EXPORT_SYMBOL(mmc_unregister_driver); 217 218static void mmc_release_card(struct device *dev) 219{ 220 struct mmc_card *card = mmc_dev_to_card(dev); 221 222 sdio_free_common_cis(card); 223 224 if (card->info) 225 kfree(card->info); 226 227 kfree(card); 228} 229 230/* 231 * Allocate and initialise a new MMC card structure. 232 */ 233struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 234{ 235 struct mmc_card *card; 236 237 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 238 if (!card) 239 return ERR_PTR(-ENOMEM); 240 241 card->host = host; 242 243 device_initialize(&card->dev); 244 245 card->dev.parent = mmc_classdev(host); 246 card->dev.bus = &mmc_bus_type; 247 card->dev.release = mmc_release_card; 248 card->dev.type = type; 249 250 return card; 251} 252 253/* 254 * Register a new MMC card with the driver model. 255 */ 256int mmc_add_card(struct mmc_card *card) 257{ 258 int ret; 259 const char *type; 260 261 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 262 263 switch (card->type) { 264 case MMC_TYPE_MMC: 265 type = "MMC"; 266 break; 267 case MMC_TYPE_SD: 268 type = "SD"; 269 if (mmc_card_blockaddr(card)) { 270 if (mmc_card_ext_capacity(card)) 271 type = "SDXC"; 272 else 273 type = "SDHC"; 274 } 275 break; 276 case MMC_TYPE_SDIO: 277 type = "SDIO"; 278 break; 279 case MMC_TYPE_SD_COMBO: 280 type = "SD-combo"; 281 if (mmc_card_blockaddr(card)) 282 type = "SDHC-combo"; 283 break; 284 default: 285 type = "?"; 286 break; 287 } 288 289 if (mmc_host_is_spi(card->host)) { 290 pr_info("%s: new %s%s%s card on SPI\n", 291 mmc_hostname(card->host), 292 mmc_card_highspeed(card) ? "high speed " : "", 293 mmc_card_ddr_mode(card) ? "DDR " : "", 294 type); 295 } else { 296 pr_info("%s: new %s%s%s%s card at address %04x\n", 297 mmc_hostname(card->host), 298 mmc_card_uhs(card) ? "ultra high speed " : 299 (mmc_card_highspeed(card) ? "high speed " : ""), 300 (mmc_card_hs200(card) ? "HS200 " : ""), 301 mmc_card_ddr_mode(card) ? "DDR " : "", 302 type, card->rca); 303 } 304 305#ifdef CONFIG_DEBUG_FS 306 mmc_add_card_debugfs(card); 307#endif 308 309 ret = device_add(&card->dev); 310 if (ret) 311 return ret; 312 313 mmc_card_set_present(card); 314 315 return 0; 316} 317 318/* 319 * Unregister a new MMC card with the driver model, and 320 * (eventually) free it. 321 */ 322void mmc_remove_card(struct mmc_card *card) 323{ 324#ifdef CONFIG_DEBUG_FS 325 mmc_remove_card_debugfs(card); 326#endif 327 328 if (mmc_card_present(card)) { 329 if (mmc_host_is_spi(card->host)) { 330 pr_info("%s: SPI card removed\n", 331 mmc_hostname(card->host)); 332 } else { 333 pr_info("%s: card %04x removed\n", 334 mmc_hostname(card->host), card->rca); 335 } 336 device_del(&card->dev); 337 } 338 339 put_device(&card->dev); 340} 341 342