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 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_driver *drv = to_mmc_driver(dev->driver);
149 struct mmc_card *card = mmc_dev_to_card(dev);
150 struct mmc_host *host = card->host;
153 if (dev->driver && drv->suspend) {
154 ret = drv->suspend(card);
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 ret = host->bus_ops->resume(host);
172 pr_warn("%s: error %d during resume (card was removed?)\n",
173 mmc_hostname(host), ret);
175 if (dev->driver && drv->resume)
176 ret = drv->resume(card);
182 #ifdef CONFIG_PM_RUNTIME
183 static int mmc_runtime_suspend(struct device *dev)
185 struct mmc_card *card = mmc_dev_to_card(dev);
186 struct mmc_host *host = card->host;
188 return host->bus_ops->runtime_suspend(host);
191 static int mmc_runtime_resume(struct device *dev)
193 struct mmc_card *card = mmc_dev_to_card(dev);
194 struct mmc_host *host = card->host;
196 return host->bus_ops->runtime_resume(host);
198 #endif /* !CONFIG_PM_RUNTIME */
200 static const struct dev_pm_ops mmc_bus_pm_ops = {
201 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
202 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
205 static struct bus_type mmc_bus_type = {
207 .dev_groups = mmc_dev_groups,
208 .match = mmc_bus_match,
209 .uevent = mmc_bus_uevent,
210 .probe = mmc_bus_probe,
211 .remove = mmc_bus_remove,
212 .shutdown = mmc_bus_shutdown,
213 .pm = &mmc_bus_pm_ops,
216 int mmc_register_bus(void)
218 return bus_register(&mmc_bus_type);
221 void mmc_unregister_bus(void)
223 bus_unregister(&mmc_bus_type);
227 * mmc_register_driver - register a media driver
228 * @drv: MMC media driver
230 int mmc_register_driver(struct mmc_driver *drv)
232 drv->drv.bus = &mmc_bus_type;
233 return driver_register(&drv->drv);
236 EXPORT_SYMBOL(mmc_register_driver);
239 * mmc_unregister_driver - unregister a media driver
240 * @drv: MMC media driver
242 void mmc_unregister_driver(struct mmc_driver *drv)
244 drv->drv.bus = &mmc_bus_type;
245 driver_unregister(&drv->drv);
248 EXPORT_SYMBOL(mmc_unregister_driver);
250 static void mmc_release_card(struct device *dev)
252 struct mmc_card *card = mmc_dev_to_card(dev);
254 sdio_free_common_cis(card);
262 * Allocate and initialise a new MMC card structure.
264 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
266 struct mmc_card *card;
268 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
270 return ERR_PTR(-ENOMEM);
274 device_initialize(&card->dev);
276 card->dev.parent = mmc_classdev(host);
277 card->dev.bus = &mmc_bus_type;
278 card->dev.release = mmc_release_card;
279 card->dev.type = type;
285 * Register a new MMC card with the driver model.
287 int mmc_add_card(struct mmc_card *card)
291 const char *uhs_bus_speed_mode = "";
292 static const char *const uhs_speeds[] = {
293 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
294 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
295 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
296 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
297 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
301 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
303 switch (card->type) {
309 if (mmc_card_blockaddr(card)) {
310 if (mmc_card_ext_capacity(card))
319 case MMC_TYPE_SD_COMBO:
321 if (mmc_card_blockaddr(card))
329 if (mmc_card_uhs(card) &&
330 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
331 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
333 if (mmc_host_is_spi(card->host)) {
334 pr_info("%s: new %s%s%s card on SPI\n",
335 mmc_hostname(card->host),
336 mmc_card_hs(card) ? "high speed " : "",
337 mmc_card_ddr52(card) ? "DDR " : "",
340 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
341 mmc_hostname(card->host),
342 mmc_card_uhs(card) ? "ultra high speed " :
343 (mmc_card_hs(card) ? "high speed " : ""),
344 mmc_card_hs400(card) ? "HS400 " :
345 (mmc_card_hs200(card) ? "HS200 " : ""),
346 mmc_card_ddr52(card) ? "DDR " : "",
347 uhs_bus_speed_mode, type, card->rca);
350 #ifdef CONFIG_DEBUG_FS
351 mmc_add_card_debugfs(card);
353 mmc_init_context_info(card->host);
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);
385 put_device(&card->dev);