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>
29 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
31 static ssize_t type_show(struct device *dev,
32 struct device_attribute *attr, char *buf)
34 struct mmc_card *card = mmc_dev_to_card(dev);
38 return sprintf(buf, "MMC\n");
40 return sprintf(buf, "SD\n");
42 return sprintf(buf, "SDIO\n");
43 case MMC_TYPE_SD_COMBO:
44 return sprintf(buf, "SDcombo\n");
49 static DEVICE_ATTR_RO(type);
51 static struct attribute *mmc_dev_attrs[] = {
55 ATTRIBUTE_GROUPS(mmc_dev);
58 * This currently matches any MMC driver to any MMC card - drivers
59 * themselves make the decision whether to drive this card in their
62 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
68 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
70 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 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
102 * Request the mmc_block device. Note: that this is a direct request
103 * for the module it carries no information as to what is inserted.
105 retval = add_uevent_var(env, "MODALIAS=mmc:block");
110 static int mmc_bus_probe(struct device *dev)
112 struct mmc_driver *drv = to_mmc_driver(dev->driver);
113 struct mmc_card *card = mmc_dev_to_card(dev);
115 return drv->probe(card);
118 static int mmc_bus_remove(struct device *dev)
120 struct mmc_driver *drv = to_mmc_driver(dev->driver);
121 struct mmc_card *card = mmc_dev_to_card(dev);
128 static void mmc_bus_shutdown(struct device *dev)
130 struct mmc_driver *drv = to_mmc_driver(dev->driver);
131 struct mmc_card *card = mmc_dev_to_card(dev);
132 struct mmc_host *host = card->host;
135 if (dev->driver && drv->shutdown)
138 if (host->bus_ops->shutdown) {
139 ret = host->bus_ops->shutdown(host);
141 pr_warn("%s: error %d during shutdown\n",
142 mmc_hostname(host), ret);
146 #ifdef CONFIG_PM_SLEEP
147 static int mmc_bus_suspend(struct device *dev)
149 struct mmc_card *card = mmc_dev_to_card(dev);
150 struct mmc_host *host = card->host;
153 ret = pm_generic_suspend(dev);
157 ret = host->bus_ops->suspend(host);
159 pm_generic_resume(dev);
164 static int mmc_bus_resume(struct device *dev)
166 struct mmc_card *card = mmc_dev_to_card(dev);
167 struct mmc_host *host = card->host;
170 ret = host->bus_ops->resume(host);
172 pr_warn("%s: error %d during resume (card was removed?)\n",
173 mmc_hostname(host), ret);
175 ret = pm_generic_resume(dev);
181 static int mmc_runtime_suspend(struct device *dev)
183 struct mmc_card *card = mmc_dev_to_card(dev);
184 struct mmc_host *host = card->host;
186 return host->bus_ops->runtime_suspend(host);
189 static int mmc_runtime_resume(struct device *dev)
191 struct mmc_card *card = mmc_dev_to_card(dev);
192 struct mmc_host *host = card->host;
194 return host->bus_ops->runtime_resume(host);
196 #endif /* !CONFIG_PM */
198 static const struct dev_pm_ops mmc_bus_pm_ops = {
199 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
200 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
203 static struct bus_type mmc_bus_type = {
205 .dev_groups = mmc_dev_groups,
206 .match = mmc_bus_match,
207 .uevent = mmc_bus_uevent,
208 .probe = mmc_bus_probe,
209 .remove = mmc_bus_remove,
210 .shutdown = mmc_bus_shutdown,
211 .pm = &mmc_bus_pm_ops,
214 int mmc_register_bus(void)
216 return bus_register(&mmc_bus_type);
219 void mmc_unregister_bus(void)
221 bus_unregister(&mmc_bus_type);
225 * mmc_register_driver - register a media driver
226 * @drv: MMC media driver
228 int mmc_register_driver(struct mmc_driver *drv)
230 drv->drv.bus = &mmc_bus_type;
231 return driver_register(&drv->drv);
234 EXPORT_SYMBOL(mmc_register_driver);
237 * mmc_unregister_driver - unregister a media driver
238 * @drv: MMC media driver
240 void mmc_unregister_driver(struct mmc_driver *drv)
242 drv->drv.bus = &mmc_bus_type;
243 driver_unregister(&drv->drv);
246 EXPORT_SYMBOL(mmc_unregister_driver);
248 static void mmc_release_card(struct device *dev)
250 struct mmc_card *card = mmc_dev_to_card(dev);
252 sdio_free_common_cis(card);
260 * Allocate and initialise a new MMC card structure.
262 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
264 struct mmc_card *card;
266 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
268 return ERR_PTR(-ENOMEM);
272 device_initialize(&card->dev);
274 card->dev.parent = mmc_classdev(host);
275 card->dev.bus = &mmc_bus_type;
276 card->dev.release = mmc_release_card;
277 card->dev.type = type;
283 * Register a new MMC card with the driver model.
285 int mmc_add_card(struct mmc_card *card)
289 const char *uhs_bus_speed_mode = "";
290 static const char *const uhs_speeds[] = {
291 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
292 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
293 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
294 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
295 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
299 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
301 switch (card->type) {
307 if (mmc_card_blockaddr(card)) {
308 if (mmc_card_ext_capacity(card))
317 case MMC_TYPE_SD_COMBO:
319 if (mmc_card_blockaddr(card))
327 if (mmc_card_uhs(card) &&
328 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
329 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
331 if (mmc_host_is_spi(card->host)) {
332 pr_info("%s: new %s%s%s card on SPI\n",
333 mmc_hostname(card->host),
334 mmc_card_hs(card) ? "high speed " : "",
335 mmc_card_ddr52(card) ? "DDR " : "",
338 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
339 mmc_hostname(card->host),
340 mmc_card_uhs(card) ? "ultra high speed " :
341 (mmc_card_hs(card) ? "high speed " : ""),
342 mmc_card_hs400(card) ? "HS400 " :
343 (mmc_card_hs200(card) ? "HS200 " : ""),
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 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 #ifdef CONFIG_DEBUG_FS
371 mmc_remove_card_debugfs(card);
374 if (mmc_card_present(card)) {
375 if (mmc_host_is_spi(card->host)) {
376 pr_info("%s: SPI card removed\n",
377 mmc_hostname(card->host));
379 pr_info("%s: card %04x removed\n",
380 mmc_hostname(card->host), card->rca);
382 device_del(&card->dev);
383 of_node_put(card->dev.of_node);
386 put_device(&card->dev);