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>
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/host.h>
28 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
30 static ssize_t type_show(struct device *dev,
31 struct device_attribute *attr, char *buf)
33 struct mmc_card *card = mmc_dev_to_card(dev);
37 return sprintf(buf, "MMC\n");
39 return sprintf(buf, "SD\n");
41 return sprintf(buf, "SDIO\n");
42 case MMC_TYPE_SD_COMBO:
43 return sprintf(buf, "SDcombo\n");
48 static DEVICE_ATTR_RO(type);
50 static struct attribute *mmc_dev_attrs[] = {
54 ATTRIBUTE_GROUPS(mmc_dev);
57 * This currently matches any MMC driver to any MMC card - drivers
58 * themselves make the decision whether to drive this card in their
61 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
67 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
69 struct mmc_card *card = mmc_dev_to_card(dev);
84 case MMC_TYPE_SD_COMBO:
92 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
97 if (card->type == MMC_TYPE_SDIO || card->type == MMC_TYPE_SD_COMBO) {
98 retval = add_uevent_var(env, "SDIO_ID=%04X:%04X",
99 card->cis.vendor, card->cis.device);
103 retval = add_uevent_var(env, "SDIO_REVISION=%u.%u",
104 card->major_rev, card->minor_rev);
108 for (i = 0; i < card->num_info; i++) {
109 retval = add_uevent_var(env, "SDIO_INFO%u=%s", i+1, card->info[i]);
116 * SDIO (non-combo) cards are not handled by mmc_block driver and do not
117 * have accessible CID register which used by mmc_card_name() function.
119 if (card->type == MMC_TYPE_SDIO)
122 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
127 * Request the mmc_block device. Note: that this is a direct request
128 * for the module it carries no information as to what is inserted.
130 retval = add_uevent_var(env, "MODALIAS=mmc:block");
135 static int mmc_bus_probe(struct device *dev)
137 struct mmc_driver *drv = to_mmc_driver(dev->driver);
138 struct mmc_card *card = mmc_dev_to_card(dev);
140 return drv->probe(card);
143 static int mmc_bus_remove(struct device *dev)
145 struct mmc_driver *drv = to_mmc_driver(dev->driver);
146 struct mmc_card *card = mmc_dev_to_card(dev);
153 static void mmc_bus_shutdown(struct device *dev)
155 struct mmc_driver *drv = to_mmc_driver(dev->driver);
156 struct mmc_card *card = mmc_dev_to_card(dev);
157 struct mmc_host *host = card->host;
160 if (dev->driver && drv->shutdown)
163 if (host->bus_ops->shutdown) {
164 ret = host->bus_ops->shutdown(host);
166 pr_warn("%s: error %d during shutdown\n",
167 mmc_hostname(host), ret);
171 #ifdef CONFIG_PM_SLEEP
172 static int mmc_bus_suspend(struct device *dev)
174 struct mmc_card *card = mmc_dev_to_card(dev);
175 struct mmc_host *host = card->host;
178 ret = pm_generic_suspend(dev);
182 ret = host->bus_ops->suspend(host);
184 pm_generic_resume(dev);
189 static int mmc_bus_resume(struct device *dev)
191 struct mmc_card *card = mmc_dev_to_card(dev);
192 struct mmc_host *host = card->host;
195 ret = host->bus_ops->resume(host);
197 pr_warn("%s: error %d during resume (card was removed?)\n",
198 mmc_hostname(host), ret);
200 ret = pm_generic_resume(dev);
206 static int mmc_runtime_suspend(struct device *dev)
208 struct mmc_card *card = mmc_dev_to_card(dev);
209 struct mmc_host *host = card->host;
211 return host->bus_ops->runtime_suspend(host);
214 static int mmc_runtime_resume(struct device *dev)
216 struct mmc_card *card = mmc_dev_to_card(dev);
217 struct mmc_host *host = card->host;
219 return host->bus_ops->runtime_resume(host);
221 #endif /* !CONFIG_PM */
223 static const struct dev_pm_ops mmc_bus_pm_ops = {
224 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
225 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
228 static struct bus_type mmc_bus_type = {
230 .dev_groups = mmc_dev_groups,
231 .match = mmc_bus_match,
232 .uevent = mmc_bus_uevent,
233 .probe = mmc_bus_probe,
234 .remove = mmc_bus_remove,
235 .shutdown = mmc_bus_shutdown,
236 .pm = &mmc_bus_pm_ops,
239 int mmc_register_bus(void)
241 return bus_register(&mmc_bus_type);
244 void mmc_unregister_bus(void)
246 bus_unregister(&mmc_bus_type);
250 * mmc_register_driver - register a media driver
251 * @drv: MMC media driver
253 int mmc_register_driver(struct mmc_driver *drv)
255 drv->drv.bus = &mmc_bus_type;
256 return driver_register(&drv->drv);
259 EXPORT_SYMBOL(mmc_register_driver);
262 * mmc_unregister_driver - unregister a media driver
263 * @drv: MMC media driver
265 void mmc_unregister_driver(struct mmc_driver *drv)
267 drv->drv.bus = &mmc_bus_type;
268 driver_unregister(&drv->drv);
271 EXPORT_SYMBOL(mmc_unregister_driver);
273 static void mmc_release_card(struct device *dev)
275 struct mmc_card *card = mmc_dev_to_card(dev);
277 sdio_free_common_cis(card);
285 * Allocate and initialise a new MMC card structure.
287 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
289 struct mmc_card *card;
291 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
293 return ERR_PTR(-ENOMEM);
297 device_initialize(&card->dev);
299 card->dev.parent = mmc_classdev(host);
300 card->dev.bus = &mmc_bus_type;
301 card->dev.release = mmc_release_card;
302 card->dev.type = type;
308 * Register a new MMC card with the driver model.
310 int mmc_add_card(struct mmc_card *card)
314 const char *uhs_bus_speed_mode = "";
315 static const char *const uhs_speeds[] = {
316 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
317 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
318 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
319 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
320 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
324 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
326 switch (card->type) {
332 if (mmc_card_blockaddr(card)) {
333 if (mmc_card_ext_capacity(card))
342 case MMC_TYPE_SD_COMBO:
344 if (mmc_card_blockaddr(card))
352 if (mmc_card_uhs(card) &&
353 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
354 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
356 if (mmc_host_is_spi(card->host)) {
357 pr_info("%s: new %s%s%s card on SPI\n",
358 mmc_hostname(card->host),
359 mmc_card_hs(card) ? "high speed " : "",
360 mmc_card_ddr52(card) ? "DDR " : "",
363 pr_info("%s: new %s%s%s%s%s%s card at address %04x\n",
364 mmc_hostname(card->host),
365 mmc_card_uhs(card) ? "ultra high speed " :
366 (mmc_card_hs(card) ? "high speed " : ""),
367 mmc_card_hs400(card) ? "HS400 " :
368 (mmc_card_hs200(card) ? "HS200 " : ""),
369 mmc_card_hs400es(card) ? "Enhanced strobe " : "",
370 mmc_card_ddr52(card) ? "DDR " : "",
371 uhs_bus_speed_mode, type, card->rca);
374 #ifdef CONFIG_DEBUG_FS
375 mmc_add_card_debugfs(card);
377 card->dev.of_node = mmc_of_find_child_device(card->host, 0);
379 device_enable_async_suspend(&card->dev);
381 ret = device_add(&card->dev);
385 mmc_card_set_present(card);
391 * Unregister a new MMC card with the driver model, and
392 * (eventually) free it.
394 void mmc_remove_card(struct mmc_card *card)
396 struct mmc_host *host = card->host;
398 #ifdef CONFIG_DEBUG_FS
399 mmc_remove_card_debugfs(card);
402 if (mmc_card_present(card)) {
403 if (mmc_host_is_spi(card->host)) {
404 pr_info("%s: SPI card removed\n",
405 mmc_hostname(card->host));
407 pr_info("%s: card %04x removed\n",
408 mmc_hostname(card->host), card->rca);
410 device_del(&card->dev);
411 of_node_put(card->dev.of_node);
414 if (host->cqe_enabled) {
415 host->cqe_ops->cqe_disable(host);
416 host->cqe_enabled = false;
419 put_device(&card->dev);