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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/mmc/core/bus.c4 *5 * Copyright (C) 2003 Russell King, All Rights Reserved.6 * Copyright (C) 2007 Pierre Ossman7 *8 * MMC card bus driver model9 */10 11#include <linux/export.h>12#include <linux/device.h>13#include <linux/err.h>14#include <linux/slab.h>15#include <linux/stat.h>16#include <linux/of.h>17#include <linux/pm_runtime.h>18#include <linux/sysfs.h>19 20#include <linux/mmc/card.h>21#include <linux/mmc/host.h>22 23#include "core.h"24#include "card.h"25#include "host.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 31static 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 sysfs_emit(buf, "MMC\n");39 case MMC_TYPE_SD:40 return sysfs_emit(buf, "SD\n");41 case MMC_TYPE_SDIO:42 return sysfs_emit(buf, "SDIO\n");43 case MMC_TYPE_SD_COMBO:44 return sysfs_emit(buf, "SDcombo\n");45 default:46 return -EFAULT;47 }48}49static DEVICE_ATTR_RO(type);50 51static struct attribute *mmc_dev_attrs[] = {52 &dev_attr_type.attr,53 NULL,54};55ATTRIBUTE_GROUPS(mmc_dev);56 57static int58mmc_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)59{60 const struct mmc_card *card = mmc_dev_to_card(dev);61 const char *type;62 unsigned int i;63 int retval = 0;64 65 switch (card->type) {66 case MMC_TYPE_MMC:67 type = "MMC";68 break;69 case MMC_TYPE_SD:70 type = "SD";71 break;72 case MMC_TYPE_SDIO:73 type = "SDIO";74 break;75 case MMC_TYPE_SD_COMBO:76 type = "SDcombo";77 break;78 default:79 type = NULL;80 }81 82 if (type) {83 retval = add_uevent_var(env, "MMC_TYPE=%s", type);84 if (retval)85 return retval;86 }87 88 if (mmc_card_sdio(card) || mmc_card_sd_combo(card)) {89 retval = add_uevent_var(env, "SDIO_ID=%04X:%04X",90 card->cis.vendor, card->cis.device);91 if (retval)92 return retval;93 94 retval = add_uevent_var(env, "SDIO_REVISION=%u.%u",95 card->major_rev, card->minor_rev);96 if (retval)97 return retval;98 99 for (i = 0; i < card->num_info; i++) {100 retval = add_uevent_var(env, "SDIO_INFO%u=%s", i+1, card->info[i]);101 if (retval)102 return retval;103 }104 }105 106 /*107 * SDIO (non-combo) cards are not handled by mmc_block driver and do not108 * have accessible CID register which used by mmc_card_name() function.109 */110 if (mmc_card_sdio(card))111 return 0;112 113 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));114 if (retval)115 return retval;116 117 /*118 * Request the mmc_block device. Note: that this is a direct request119 * for the module it carries no information as to what is inserted.120 */121 retval = add_uevent_var(env, "MODALIAS=mmc:block");122 123 return retval;124}125 126static int mmc_bus_probe(struct device *dev)127{128 struct mmc_driver *drv = to_mmc_driver(dev->driver);129 struct mmc_card *card = mmc_dev_to_card(dev);130 131 return drv->probe(card);132}133 134static void mmc_bus_remove(struct device *dev)135{136 struct mmc_driver *drv = to_mmc_driver(dev->driver);137 struct mmc_card *card = mmc_dev_to_card(dev);138 139 drv->remove(card);140}141 142static void mmc_bus_shutdown(struct device *dev)143{144 struct mmc_driver *drv = to_mmc_driver(dev->driver);145 struct mmc_card *card = mmc_dev_to_card(dev);146 struct mmc_host *host = card->host;147 int ret;148 149 if (dev->driver && drv->shutdown)150 drv->shutdown(card);151 152 if (host->bus_ops->shutdown) {153 ret = host->bus_ops->shutdown(host);154 if (ret)155 pr_warn("%s: error %d during shutdown\n",156 mmc_hostname(host), ret);157 }158}159 160#ifdef CONFIG_PM_SLEEP161static int mmc_bus_suspend(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 = pm_generic_suspend(dev);168 if (ret)169 return ret;170 171 ret = host->bus_ops->suspend(host);172 if (ret)173 pm_generic_resume(dev);174 175 return ret;176}177 178static int mmc_bus_resume(struct device *dev)179{180 struct mmc_card *card = mmc_dev_to_card(dev);181 struct mmc_host *host = card->host;182 int ret;183 184 ret = host->bus_ops->resume(host);185 if (ret)186 pr_warn("%s: error %d during resume (card was removed?)\n",187 mmc_hostname(host), ret);188 189 ret = pm_generic_resume(dev);190 return ret;191}192#endif193 194#ifdef CONFIG_PM195static int mmc_runtime_suspend(struct device *dev)196{197 struct mmc_card *card = mmc_dev_to_card(dev);198 struct mmc_host *host = card->host;199 200 return host->bus_ops->runtime_suspend(host);201}202 203static int mmc_runtime_resume(struct device *dev)204{205 struct mmc_card *card = mmc_dev_to_card(dev);206 struct mmc_host *host = card->host;207 208 return host->bus_ops->runtime_resume(host);209}210#endif /* !CONFIG_PM */211 212static const struct dev_pm_ops mmc_bus_pm_ops = {213 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)214 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)215};216 217static const struct bus_type mmc_bus_type = {218 .name = "mmc",219 .dev_groups = mmc_dev_groups,220 .uevent = mmc_bus_uevent,221 .probe = mmc_bus_probe,222 .remove = mmc_bus_remove,223 .shutdown = mmc_bus_shutdown,224 .pm = &mmc_bus_pm_ops,225};226 227int mmc_register_bus(void)228{229 return bus_register(&mmc_bus_type);230}231 232void mmc_unregister_bus(void)233{234 bus_unregister(&mmc_bus_type);235}236 237/**238 * mmc_register_driver - register a media driver239 * @drv: MMC media driver240 */241int mmc_register_driver(struct mmc_driver *drv)242{243 drv->drv.bus = &mmc_bus_type;244 return driver_register(&drv->drv);245}246 247EXPORT_SYMBOL(mmc_register_driver);248 249/**250 * mmc_unregister_driver - unregister a media driver251 * @drv: MMC media driver252 */253void mmc_unregister_driver(struct mmc_driver *drv)254{255 drv->drv.bus = &mmc_bus_type;256 driver_unregister(&drv->drv);257}258 259EXPORT_SYMBOL(mmc_unregister_driver);260 261static void mmc_release_card(struct device *dev)262{263 struct mmc_card *card = mmc_dev_to_card(dev);264 265 sdio_free_common_cis(card);266 267 kfree(card->info);268 269 kfree(card);270}271 272/*273 * Allocate and initialise a new MMC card structure.274 */275struct mmc_card *mmc_alloc_card(struct mmc_host *host, const struct device_type *type)276{277 struct mmc_card *card;278 279 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);280 if (!card)281 return ERR_PTR(-ENOMEM);282 283 card->host = host;284 285 device_initialize(&card->dev);286 287 card->dev.parent = mmc_classdev(host);288 card->dev.bus = &mmc_bus_type;289 card->dev.release = mmc_release_card;290 card->dev.type = type;291 292 return card;293}294 295/*296 * Register a new MMC card with the driver model.297 */298int mmc_add_card(struct mmc_card *card)299{300 int ret;301 const char *type;302 const char *uhs_bus_speed_mode = "";303 static const char *const uhs_speeds[] = {304 [UHS_SDR12_BUS_SPEED] = "SDR12 ",305 [UHS_SDR25_BUS_SPEED] = "SDR25 ",306 [UHS_SDR50_BUS_SPEED] = "SDR50 ",307 [UHS_SDR104_BUS_SPEED] = "SDR104 ",308 [UHS_DDR50_BUS_SPEED] = "DDR50 ",309 };310 311 312 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);313 dev_set_removable(&card->dev,314 mmc_card_is_removable(card->host) ?315 DEVICE_REMOVABLE : DEVICE_FIXED);316 317 switch (card->type) {318 case MMC_TYPE_MMC:319 type = "MMC";320 break;321 case MMC_TYPE_SD:322 type = "SD";323 if (mmc_card_blockaddr(card)) {324 if (mmc_card_ext_capacity(card))325 type = "SDXC";326 else327 type = "SDHC";328 }329 break;330 case MMC_TYPE_SDIO:331 type = "SDIO";332 break;333 case MMC_TYPE_SD_COMBO:334 type = "SD-combo";335 if (mmc_card_blockaddr(card))336 type = "SDHC-combo";337 break;338 default:339 type = "?";340 break;341 }342 343 if (mmc_card_uhs(card) &&344 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))345 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];346 347 if (mmc_host_is_spi(card->host)) {348 pr_info("%s: new %s%s%s card on SPI\n",349 mmc_hostname(card->host),350 mmc_card_hs(card) ? "high speed " : "",351 mmc_card_ddr52(card) ? "DDR " : "",352 type);353 } else {354 pr_info("%s: new %s%s%s%s%s%s card at address %04x\n",355 mmc_hostname(card->host),356 mmc_card_uhs(card) ? "ultra high speed " :357 (mmc_card_hs(card) ? "high speed " : ""),358 mmc_card_hs400(card) ? "HS400 " :359 (mmc_card_hs200(card) ? "HS200 " : ""),360 mmc_card_hs400es(card) ? "Enhanced strobe " : "",361 mmc_card_ddr52(card) ? "DDR " : "",362 uhs_bus_speed_mode, type, card->rca);363 }364 365 mmc_add_card_debugfs(card);366 card->dev.of_node = mmc_of_find_child_device(card->host, 0);367 368 device_enable_async_suspend(&card->dev);369 370 ret = device_add(&card->dev);371 if (ret)372 return ret;373 374 mmc_card_set_present(card);375 376 return 0;377}378 379/*380 * Unregister a new MMC card with the driver model, and381 * (eventually) free it.382 */383void mmc_remove_card(struct mmc_card *card)384{385 struct mmc_host *host = card->host;386 387 mmc_remove_card_debugfs(card);388 389 if (mmc_card_present(card)) {390 if (mmc_host_is_spi(card->host)) {391 pr_info("%s: SPI card removed\n",392 mmc_hostname(card->host));393 } else {394 pr_info("%s: card %04x removed\n",395 mmc_hostname(card->host), card->rca);396 }397 device_del(&card->dev);398 of_node_put(card->dev.of_node);399 }400 401 if (host->cqe_enabled) {402 host->cqe_ops->cqe_disable(host);403 host->cqe_enabled = false;404 }405 406 put_device(&card->dev);407}408