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);
129 struct mmc_host *host = card->host;
132 if (dev->driver && drv->shutdown)
135 if (host->bus_ops->shutdown) {
136 ret = host->bus_ops->shutdown(host);
139 pr_warn("%s: error %d during shutdown\n",mmc_hostname(host), ret);
144 #ifdef CONFIG_PM_SLEEP
145 static int mmc_bus_suspend(struct device *dev)
147 struct mmc_driver *drv = to_mmc_driver(dev->driver);
148 struct mmc_card *card = mmc_dev_to_card(dev);
149 struct mmc_host *host = card->host;
152 if (dev->driver && drv->suspend) {
153 ret = drv->suspend(card);
158 if(host->bus_ops->suspend)
159 ret = host->bus_ops->suspend(host);
163 static int mmc_bus_resume(struct device *dev)
165 struct mmc_driver *drv = to_mmc_driver(dev->driver);
166 struct mmc_card *card = mmc_dev_to_card(dev);
167 struct mmc_host *host = card->host;
170 if(host->bus_ops->resume){
171 ret = host->bus_ops->resume(host);
173 pr_warn("%s: error %d during resume (card was removed?)\n",
174 mmc_hostname(host), ret);
177 if (dev->driver && drv->resume)
178 ret = drv->resume(card);
184 #ifdef CONFIG_PM_RUNTIME
186 static int mmc_runtime_suspend(struct device *dev)
188 struct mmc_card *card = mmc_dev_to_card(dev);
189 struct mmc_host *host = card->host;
192 if (host->bus_ops->runtime_suspend)
193 ret = host->bus_ops->runtime_suspend(host);
198 static int mmc_runtime_resume(struct device *dev)
200 struct mmc_card *card = mmc_dev_to_card(dev);
201 struct mmc_host *host = card->host;
204 if (host->bus_ops->runtime_resume)
205 ret = host->bus_ops->runtime_resume(host);
210 static int mmc_runtime_idle(struct device *dev)
215 #endif /* !CONFIG_PM_RUNTIME */
217 static const struct dev_pm_ops mmc_bus_pm_ops = {
218 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume,
220 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
223 static struct bus_type mmc_bus_type = {
225 .dev_attrs = mmc_dev_attrs,
226 .match = mmc_bus_match,
227 .uevent = mmc_bus_uevent,
228 .probe = mmc_bus_probe,
229 .remove = mmc_bus_remove,
230 .shutdown = mmc_bus_shutdown,
231 .pm = &mmc_bus_pm_ops,
234 int mmc_register_bus(void)
236 return bus_register(&mmc_bus_type);
239 void mmc_unregister_bus(void)
241 bus_unregister(&mmc_bus_type);
245 * mmc_register_driver - register a media driver
246 * @drv: MMC media driver
248 int mmc_register_driver(struct mmc_driver *drv)
250 drv->drv.bus = &mmc_bus_type;
251 return driver_register(&drv->drv);
254 EXPORT_SYMBOL(mmc_register_driver);
257 * mmc_unregister_driver - unregister a media driver
258 * @drv: MMC media driver
260 void mmc_unregister_driver(struct mmc_driver *drv)
262 drv->drv.bus = &mmc_bus_type;
263 driver_unregister(&drv->drv);
266 EXPORT_SYMBOL(mmc_unregister_driver);
268 static void mmc_release_card(struct device *dev)
270 struct mmc_card *card = mmc_dev_to_card(dev);
272 sdio_free_common_cis(card);
280 * Allocate and initialise a new MMC card structure.
282 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
284 struct mmc_card *card;
286 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
288 return ERR_PTR(-ENOMEM);
292 device_initialize(&card->dev);
294 card->dev.parent = mmc_classdev(host);
295 card->dev.bus = &mmc_bus_type;
296 card->dev.release = mmc_release_card;
297 card->dev.type = type;
303 * Register a new MMC card with the driver model.
305 int mmc_add_card(struct mmc_card *card)
309 const char *uhs_bus_speed_mode = "";
310 static const char *const uhs_speeds[] = {
311 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
312 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
313 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
314 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
315 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
319 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
321 switch (card->type) {
327 if (mmc_card_blockaddr(card)) {
328 if (mmc_card_ext_capacity(card))
337 case MMC_TYPE_SD_COMBO:
339 if (mmc_card_blockaddr(card))
347 if (mmc_card_uhs(card) &&
348 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
349 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
351 if (mmc_host_is_spi(card->host)) {
352 pr_info("%s: new %s%s%s card on SPI\n",
353 mmc_hostname(card->host),
354 mmc_card_highspeed(card) ? "high speed " : "",
355 mmc_card_ddr_mode(card) ? "DDR " : "",
358 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
359 mmc_hostname(card->host),
360 mmc_card_uhs(card) ? "ultra high speed " :
361 (mmc_card_highspeed(card) ? "high speed " : ""),
362 (mmc_card_hs200(card) ? "HS200 " : ""),
363 mmc_card_ddr_mode(card) ? "DDR " : "",
364 uhs_bus_speed_mode, type, card->rca);
367 #ifdef CONFIG_DEBUG_FS
368 mmc_add_card_debugfs(card);
370 mmc_init_context_info(card->host);
372 ret = device_add(&card->dev);
376 mmc_card_set_present(card);
382 * Unregister a new MMC card with the driver model, and
383 * (eventually) free it.
385 void mmc_remove_card(struct mmc_card *card)
387 #ifdef CONFIG_DEBUG_FS
388 mmc_remove_card_debugfs(card);
391 if (mmc_card_present(card)) {
392 if (mmc_host_is_spi(card->host)) {
393 pr_info("%s: SPI card removed\n",
394 mmc_hostname(card->host));
396 pr_info("%s: card %04x removed\n",
397 mmc_hostname(card->host), card->rca);
399 device_del(&card->dev);
402 put_device(&card->dev);