2 * linux/drivers/mmc/core/bus.c
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright (C) 2007 Pierre Ossman
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.
11 * MMC card bus driver model
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>
20 #include <linux/pm_runtime.h>
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/host.h>
31 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
33 static ssize_t type_show(struct device *dev,
34 struct device_attribute *attr, char *buf)
36 struct mmc_card *card = mmc_dev_to_card(dev);
40 return sprintf(buf, "MMC\n");
42 return sprintf(buf, "SD\n");
44 return sprintf(buf, "SDIO\n");
45 case MMC_TYPE_SD_COMBO:
46 return sprintf(buf, "SDcombo\n");
51 static DEVICE_ATTR_RO(type);
53 static struct attribute *mmc_dev_attrs[] = {
57 ATTRIBUTE_GROUPS(mmc_dev);
60 * This currently matches any MMC driver to any MMC card - drivers
61 * themselves make the decision whether to drive this card in their
64 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
70 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
72 struct mmc_card *card = mmc_dev_to_card(dev);
86 case MMC_TYPE_SD_COMBO:
94 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
99 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
104 * Request the mmc_block device. Note: that this is a direct request
105 * for the module it carries no information as to what is inserted.
107 retval = add_uevent_var(env, "MODALIAS=mmc:block");
112 static int mmc_bus_probe(struct device *dev)
114 struct mmc_driver *drv = to_mmc_driver(dev->driver);
115 struct mmc_card *card = mmc_dev_to_card(dev);
117 return drv->probe(card);
120 static int mmc_bus_remove(struct device *dev)
122 struct mmc_driver *drv = to_mmc_driver(dev->driver);
123 struct mmc_card *card = mmc_dev_to_card(dev);
130 static void mmc_bus_shutdown(struct device *dev)
132 struct mmc_driver *drv = to_mmc_driver(dev->driver);
133 struct mmc_card *card = mmc_dev_to_card(dev);
134 struct mmc_host *host = card->host;
137 if (dev->driver && drv->shutdown)
140 if (host->bus_ops->shutdown) {
141 ret = host->bus_ops->shutdown(host);
143 pr_warn("%s: error %d during shutdown\n",
144 mmc_hostname(host), ret);
148 #ifdef CONFIG_PM_SLEEP
149 static int mmc_bus_suspend(struct device *dev)
151 struct mmc_card *card = mmc_dev_to_card(dev);
152 struct mmc_host *host = card->host;
155 ret = pm_generic_suspend(dev);
159 ret = host->bus_ops->suspend(host);
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 mmc_init_context_info(card->host);
353 card->dev.of_node = mmc_of_find_child_device(card->host, 0);
355 device_enable_async_suspend(&card->dev);
357 ret = device_add(&card->dev);
361 mmc_card_set_present(card);
367 * Unregister a new MMC card with the driver model, and
368 * (eventually) free it.
370 void mmc_remove_card(struct mmc_card *card)
372 struct mmc_host *host = card->host;
374 #ifdef CONFIG_DEBUG_FS
375 mmc_remove_card_debugfs(card);
378 if (host->cqe_enabled) {
379 host->cqe_ops->cqe_disable(host);
380 host->cqe_enabled = false;
383 if (mmc_card_present(card)) {
384 if (mmc_host_is_spi(card->host)) {
385 pr_info("%s: SPI card removed\n",
386 mmc_hostname(card->host));
388 pr_info("%s: card %04x removed\n",
389 mmc_hostname(card->host), card->rca);
391 device_del(&card->dev);
392 of_node_put(card->dev.of_node);
395 put_device(&card->dev);