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>
19 #include <linux/pm_runtime.h>
21 #include <linux/mmc/card.h>
22 #include <linux/mmc/host.h>
28 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
30 static ssize_t mmc_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");
49 static struct device_attribute mmc_dev_attrs[] = {
50 __ATTR(type, S_IRUGO, mmc_type_show, NULL),
55 * This currently matches any MMC driver to any MMC card - drivers
56 * themselves make the decision whether to drive this card in their
59 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
65 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
67 struct mmc_card *card = mmc_dev_to_card(dev);
81 case MMC_TYPE_SD_COMBO:
89 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
94 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
99 * Request the mmc_block device. Note: that this is a direct request
100 * for the module it carries no information as to what is inserted.
102 retval = add_uevent_var(env, "MODALIAS=mmc:block");
107 static int mmc_bus_probe(struct device *dev)
109 struct mmc_driver *drv = to_mmc_driver(dev->driver);
110 struct mmc_card *card = mmc_dev_to_card(dev);
112 return drv->probe(card);
115 static int mmc_bus_remove(struct device *dev)
117 struct mmc_driver *drv = to_mmc_driver(dev->driver);
118 struct mmc_card *card = mmc_dev_to_card(dev);
125 static void mmc_bus_shutdown(struct device *dev)
127 struct mmc_driver *drv = to_mmc_driver(dev->driver);
128 struct mmc_card *card = mmc_dev_to_card(dev);
133 #ifdef CONFIG_PM_SLEEP
134 static int mmc_bus_suspend(struct device *dev)
136 struct mmc_driver *drv = to_mmc_driver(dev->driver);
137 struct mmc_card *card = mmc_dev_to_card(dev);
138 struct mmc_host *host = card->host;
141 if (dev->driver && drv->suspend) {
142 ret = drv->suspend(card);
147 ret = host->bus_ops->suspend(host);
151 static int mmc_bus_resume(struct device *dev)
153 struct mmc_driver *drv = to_mmc_driver(dev->driver);
154 struct mmc_card *card = mmc_dev_to_card(dev);
155 struct mmc_host *host = card->host;
158 ret = host->bus_ops->resume(host);
160 pr_warn("%s: error %d during resume (card was removed?)\n",
161 mmc_hostname(host), ret);
163 if (dev->driver && drv->resume)
164 ret = drv->resume(card);
170 #ifdef CONFIG_PM_RUNTIME
172 static int mmc_runtime_suspend(struct device *dev)
174 struct mmc_card *card = mmc_dev_to_card(dev);
175 struct mmc_host *host = card->host;
178 if (host->bus_ops->runtime_suspend)
179 ret = host->bus_ops->runtime_suspend(host);
184 static int mmc_runtime_resume(struct device *dev)
186 struct mmc_card *card = mmc_dev_to_card(dev);
187 struct mmc_host *host = card->host;
190 if (host->bus_ops->runtime_resume)
191 ret = host->bus_ops->runtime_resume(host);
196 static int mmc_runtime_idle(struct device *dev)
198 return pm_runtime_suspend(dev);
201 #endif /* !CONFIG_PM_RUNTIME */
203 static const struct dev_pm_ops mmc_bus_pm_ops = {
204 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume,
206 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
209 static struct bus_type mmc_bus_type = {
211 .dev_attrs = mmc_dev_attrs,
212 .match = mmc_bus_match,
213 .uevent = mmc_bus_uevent,
214 .probe = mmc_bus_probe,
215 .remove = mmc_bus_remove,
216 .shutdown = mmc_bus_shutdown,
217 .pm = &mmc_bus_pm_ops,
220 int mmc_register_bus(void)
222 return bus_register(&mmc_bus_type);
225 void mmc_unregister_bus(void)
227 bus_unregister(&mmc_bus_type);
231 * mmc_register_driver - register a media driver
232 * @drv: MMC media driver
234 int mmc_register_driver(struct mmc_driver *drv)
236 drv->drv.bus = &mmc_bus_type;
237 return driver_register(&drv->drv);
240 EXPORT_SYMBOL(mmc_register_driver);
243 * mmc_unregister_driver - unregister a media driver
244 * @drv: MMC media driver
246 void mmc_unregister_driver(struct mmc_driver *drv)
248 drv->drv.bus = &mmc_bus_type;
249 driver_unregister(&drv->drv);
252 EXPORT_SYMBOL(mmc_unregister_driver);
254 static void mmc_release_card(struct device *dev)
256 struct mmc_card *card = mmc_dev_to_card(dev);
258 sdio_free_common_cis(card);
266 * Allocate and initialise a new MMC card structure.
268 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
270 struct mmc_card *card;
272 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
274 return ERR_PTR(-ENOMEM);
278 device_initialize(&card->dev);
280 card->dev.parent = mmc_classdev(host);
281 card->dev.bus = &mmc_bus_type;
282 card->dev.release = mmc_release_card;
283 card->dev.type = type;
289 * Register a new MMC card with the driver model.
291 int mmc_add_card(struct mmc_card *card)
295 const char *uhs_bus_speed_mode = "";
296 static const char *const uhs_speeds[] = {
297 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
298 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
299 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
300 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
301 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
305 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
307 switch (card->type) {
313 if (mmc_card_blockaddr(card)) {
314 if (mmc_card_ext_capacity(card))
323 case MMC_TYPE_SD_COMBO:
325 if (mmc_card_blockaddr(card))
333 if (mmc_sd_card_uhs(card) &&
334 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
335 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
337 if (mmc_host_is_spi(card->host)) {
338 pr_info("%s: new %s%s%s card on SPI\n",
339 mmc_hostname(card->host),
340 mmc_card_highspeed(card) ? "high speed " : "",
341 mmc_card_ddr_mode(card) ? "DDR " : "",
344 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
345 mmc_hostname(card->host),
346 mmc_card_uhs(card) ? "ultra high speed " :
347 (mmc_card_highspeed(card) ? "high speed " : ""),
348 (mmc_card_hs200(card) ? "HS200 " : ""),
349 mmc_card_ddr_mode(card) ? "DDR " : "",
350 uhs_bus_speed_mode, type, card->rca);
353 #ifdef CONFIG_DEBUG_FS
354 mmc_add_card_debugfs(card);
356 mmc_init_context_info(card->host);
358 ret = device_add(&card->dev);
362 mmc_card_set_present(card);
368 * Unregister a new MMC card with the driver model, and
369 * (eventually) free it.
371 void mmc_remove_card(struct mmc_card *card)
373 #ifdef CONFIG_DEBUG_FS
374 mmc_remove_card_debugfs(card);
377 if (mmc_card_present(card)) {
378 if (mmc_host_is_spi(card->host)) {
379 pr_info("%s: SPI card removed\n",
380 mmc_hostname(card->host));
382 pr_info("%s: card %04x removed\n",
383 mmc_hostname(card->host), card->rca);
385 device_del(&card->dev);
388 put_device(&card->dev);