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);
83 case MMC_TYPE_SD_COMBO:
91 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
96 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
101 * Request the mmc_block device. Note: that this is a direct request
102 * for the module it carries no information as to what is inserted.
104 retval = add_uevent_var(env, "MODALIAS=mmc:block");
109 static int mmc_bus_probe(struct device *dev)
111 struct mmc_driver *drv = to_mmc_driver(dev->driver);
112 struct mmc_card *card = mmc_dev_to_card(dev);
114 return drv->probe(card);
117 static int mmc_bus_remove(struct device *dev)
119 struct mmc_driver *drv = to_mmc_driver(dev->driver);
120 struct mmc_card *card = mmc_dev_to_card(dev);
127 static void mmc_bus_shutdown(struct device *dev)
129 struct mmc_driver *drv = to_mmc_driver(dev->driver);
130 struct mmc_card *card = mmc_dev_to_card(dev);
131 struct mmc_host *host = card->host;
134 if (dev->driver && drv->shutdown)
137 if (host->bus_ops->shutdown) {
138 ret = host->bus_ops->shutdown(host);
140 pr_warn("%s: error %d during shutdown\n",
141 mmc_hostname(host), ret);
145 #ifdef CONFIG_PM_SLEEP
146 static int mmc_bus_suspend(struct device *dev)
148 struct mmc_card *card = mmc_dev_to_card(dev);
149 struct mmc_host *host = card->host;
152 ret = pm_generic_suspend(dev);
156 ret = host->bus_ops->suspend(host);
158 pm_generic_resume(dev);
163 static int mmc_bus_resume(struct device *dev)
165 struct mmc_card *card = mmc_dev_to_card(dev);
166 struct mmc_host *host = card->host;
169 ret = host->bus_ops->resume(host);
171 pr_warn("%s: error %d during resume (card was removed?)\n",
172 mmc_hostname(host), ret);
174 ret = pm_generic_resume(dev);
180 static int mmc_runtime_suspend(struct device *dev)
182 struct mmc_card *card = mmc_dev_to_card(dev);
183 struct mmc_host *host = card->host;
185 return host->bus_ops->runtime_suspend(host);
188 static int mmc_runtime_resume(struct device *dev)
190 struct mmc_card *card = mmc_dev_to_card(dev);
191 struct mmc_host *host = card->host;
193 return host->bus_ops->runtime_resume(host);
195 #endif /* !CONFIG_PM */
197 static const struct dev_pm_ops mmc_bus_pm_ops = {
198 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
199 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
202 static struct bus_type mmc_bus_type = {
204 .dev_groups = mmc_dev_groups,
205 .match = mmc_bus_match,
206 .uevent = mmc_bus_uevent,
207 .probe = mmc_bus_probe,
208 .remove = mmc_bus_remove,
209 .shutdown = mmc_bus_shutdown,
210 .pm = &mmc_bus_pm_ops,
213 int mmc_register_bus(void)
215 return bus_register(&mmc_bus_type);
218 void mmc_unregister_bus(void)
220 bus_unregister(&mmc_bus_type);
224 * mmc_register_driver - register a media driver
225 * @drv: MMC media driver
227 int mmc_register_driver(struct mmc_driver *drv)
229 drv->drv.bus = &mmc_bus_type;
230 return driver_register(&drv->drv);
233 EXPORT_SYMBOL(mmc_register_driver);
236 * mmc_unregister_driver - unregister a media driver
237 * @drv: MMC media driver
239 void mmc_unregister_driver(struct mmc_driver *drv)
241 drv->drv.bus = &mmc_bus_type;
242 driver_unregister(&drv->drv);
245 EXPORT_SYMBOL(mmc_unregister_driver);
247 static void mmc_release_card(struct device *dev)
249 struct mmc_card *card = mmc_dev_to_card(dev);
251 sdio_free_common_cis(card);
259 * Allocate and initialise a new MMC card structure.
261 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
263 struct mmc_card *card;
265 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
267 return ERR_PTR(-ENOMEM);
271 device_initialize(&card->dev);
273 card->dev.parent = mmc_classdev(host);
274 card->dev.bus = &mmc_bus_type;
275 card->dev.release = mmc_release_card;
276 card->dev.type = type;
282 * Register a new MMC card with the driver model.
284 int mmc_add_card(struct mmc_card *card)
288 const char *uhs_bus_speed_mode = "";
289 static const char *const uhs_speeds[] = {
290 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
291 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
292 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
293 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
294 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
298 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
300 switch (card->type) {
306 if (mmc_card_blockaddr(card)) {
307 if (mmc_card_ext_capacity(card))
316 case MMC_TYPE_SD_COMBO:
318 if (mmc_card_blockaddr(card))
326 if (mmc_card_uhs(card) &&
327 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
328 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
330 if (mmc_host_is_spi(card->host)) {
331 pr_info("%s: new %s%s%s card on SPI\n",
332 mmc_hostname(card->host),
333 mmc_card_hs(card) ? "high speed " : "",
334 mmc_card_ddr52(card) ? "DDR " : "",
337 pr_info("%s: new %s%s%s%s%s%s card at address %04x\n",
338 mmc_hostname(card->host),
339 mmc_card_uhs(card) ? "ultra high speed " :
340 (mmc_card_hs(card) ? "high speed " : ""),
341 mmc_card_hs400(card) ? "HS400 " :
342 (mmc_card_hs200(card) ? "HS200 " : ""),
343 mmc_card_hs400es(card) ? "Enhanced strobe " : "",
344 mmc_card_ddr52(card) ? "DDR " : "",
345 uhs_bus_speed_mode, type, card->rca);
348 #ifdef CONFIG_DEBUG_FS
349 mmc_add_card_debugfs(card);
351 card->dev.of_node = mmc_of_find_child_device(card->host, 0);
353 device_enable_async_suspend(&card->dev);
355 ret = device_add(&card->dev);
359 mmc_card_set_present(card);
365 * Unregister a new MMC card with the driver model, and
366 * (eventually) free it.
368 void mmc_remove_card(struct mmc_card *card)
370 struct mmc_host *host = card->host;
372 #ifdef CONFIG_DEBUG_FS
373 mmc_remove_card_debugfs(card);
376 if (host->cqe_enabled) {
377 host->cqe_ops->cqe_disable(host);
378 host->cqe_enabled = false;
381 if (mmc_card_present(card)) {
382 if (mmc_host_is_spi(card->host)) {
383 pr_info("%s: SPI card removed\n",
384 mmc_hostname(card->host));
386 pr_info("%s: card %04x removed\n",
387 mmc_hostname(card->host), card->rca);
389 device_del(&card->dev);
390 of_node_put(card->dev.of_node);
393 put_device(&card->dev);