1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/mmc/core/bus.c
5 * Copyright (C) 2003 Russell King, All Rights Reserved.
6 * Copyright (C) 2007 Pierre Ossman
8 * MMC card bus driver model
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>
17 #include <linux/pm_runtime.h>
18 #include <linux/sysfs.h>
20 #include <linux/mmc/card.h>
21 #include <linux/mmc/host.h>
29 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
31 static ssize_t type_show(struct device *dev,
32 struct device_attribute *attr, char *buf)
34 struct mmc_card *card = mmc_dev_to_card(dev);
38 return sysfs_emit(buf, "MMC\n");
40 return sysfs_emit(buf, "SD\n");
42 return sysfs_emit(buf, "SDIO\n");
43 case MMC_TYPE_SD_COMBO:
44 return sysfs_emit(buf, "SDcombo\n");
49 static DEVICE_ATTR_RO(type);
51 static struct attribute *mmc_dev_attrs[] = {
55 ATTRIBUTE_GROUPS(mmc_dev);
58 mmc_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
60 const struct mmc_card *card = mmc_dev_to_card(dev);
75 case MMC_TYPE_SD_COMBO:
83 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
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);
94 retval = add_uevent_var(env, "SDIO_REVISION=%u.%u",
95 card->major_rev, card->minor_rev);
99 for (i = 0; i < card->num_info; i++) {
100 retval = add_uevent_var(env, "SDIO_INFO%u=%s", i+1, card->info[i]);
107 * SDIO (non-combo) cards are not handled by mmc_block driver and do not
108 * have accessible CID register which used by mmc_card_name() function.
110 if (mmc_card_sdio(card))
113 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
118 * Request the mmc_block device. Note: that this is a direct request
119 * for the module it carries no information as to what is inserted.
121 retval = add_uevent_var(env, "MODALIAS=mmc:block");
126 static int mmc_bus_probe(struct device *dev)
128 struct mmc_driver *drv = to_mmc_driver(dev->driver);
129 struct mmc_card *card = mmc_dev_to_card(dev);
131 return drv->probe(card);
134 static void mmc_bus_remove(struct device *dev)
136 struct mmc_driver *drv = to_mmc_driver(dev->driver);
137 struct mmc_card *card = mmc_dev_to_card(dev);
142 static void mmc_bus_shutdown(struct device *dev)
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;
149 if (dev->driver && drv->shutdown)
152 if (host->bus_ops->shutdown) {
153 ret = host->bus_ops->shutdown(host);
155 pr_warn("%s: error %d during shutdown\n",
156 mmc_hostname(host), ret);
160 #ifdef CONFIG_PM_SLEEP
161 static int mmc_bus_suspend(struct device *dev)
163 struct mmc_card *card = mmc_dev_to_card(dev);
164 struct mmc_host *host = card->host;
167 ret = pm_generic_suspend(dev);
171 ret = host->bus_ops->suspend(host);
173 pm_generic_resume(dev);
178 static int mmc_bus_resume(struct device *dev)
180 struct mmc_card *card = mmc_dev_to_card(dev);
181 struct mmc_host *host = card->host;
184 ret = host->bus_ops->resume(host);
186 pr_warn("%s: error %d during resume (card was removed?)\n",
187 mmc_hostname(host), ret);
189 ret = pm_generic_resume(dev);
195 static int mmc_runtime_suspend(struct device *dev)
197 struct mmc_card *card = mmc_dev_to_card(dev);
198 struct mmc_host *host = card->host;
200 return host->bus_ops->runtime_suspend(host);
203 static int mmc_runtime_resume(struct device *dev)
205 struct mmc_card *card = mmc_dev_to_card(dev);
206 struct mmc_host *host = card->host;
208 return host->bus_ops->runtime_resume(host);
210 #endif /* !CONFIG_PM */
212 static 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)
217 static struct bus_type mmc_bus_type = {
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,
227 int mmc_register_bus(void)
229 return bus_register(&mmc_bus_type);
232 void mmc_unregister_bus(void)
234 bus_unregister(&mmc_bus_type);
238 * mmc_register_driver - register a media driver
239 * @drv: MMC media driver
241 int mmc_register_driver(struct mmc_driver *drv)
243 drv->drv.bus = &mmc_bus_type;
244 return driver_register(&drv->drv);
247 EXPORT_SYMBOL(mmc_register_driver);
250 * mmc_unregister_driver - unregister a media driver
251 * @drv: MMC media driver
253 void mmc_unregister_driver(struct mmc_driver *drv)
255 drv->drv.bus = &mmc_bus_type;
256 driver_unregister(&drv->drv);
259 EXPORT_SYMBOL(mmc_unregister_driver);
261 static void mmc_release_card(struct device *dev)
263 struct mmc_card *card = mmc_dev_to_card(dev);
265 sdio_free_common_cis(card);
273 * Allocate and initialise a new MMC card structure.
275 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
277 struct mmc_card *card;
279 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
281 return ERR_PTR(-ENOMEM);
285 device_initialize(&card->dev);
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;
296 * Register a new MMC card with the driver model.
298 int mmc_add_card(struct mmc_card *card)
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 ",
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);
317 switch (card->type) {
323 if (mmc_card_blockaddr(card)) {
324 if (mmc_card_ext_capacity(card))
333 case MMC_TYPE_SD_COMBO:
335 if (mmc_card_blockaddr(card))
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];
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 " : "",
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);
365 mmc_add_card_debugfs(card);
366 card->dev.of_node = mmc_of_find_child_device(card->host, 0);
368 device_enable_async_suspend(&card->dev);
370 ret = device_add(&card->dev);
374 mmc_card_set_present(card);
380 * Unregister a new MMC card with the driver model, and
381 * (eventually) free it.
383 void mmc_remove_card(struct mmc_card *card)
385 struct mmc_host *host = card->host;
387 mmc_remove_card_debugfs(card);
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));
394 pr_info("%s: card %04x removed\n",
395 mmc_hostname(card->host), card->rca);
397 device_del(&card->dev);
398 of_node_put(card->dev.of_node);
401 if (host->cqe_enabled) {
402 host->cqe_ops->cqe_disable(host);
403 host->cqe_enabled = false;
406 put_device(&card->dev);