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);
138 pr_warn("%s: error %d during shutdown\n",
139 mmc_hostname(host), ret);
143 #ifdef CONFIG_PM_SLEEP
144 static int mmc_bus_suspend(struct device *dev)
146 struct mmc_driver *drv = to_mmc_driver(dev->driver);
147 struct mmc_card *card = mmc_dev_to_card(dev);
150 if (dev->driver && drv->suspend)
151 ret = drv->suspend(card);
155 static int mmc_bus_resume(struct device *dev)
157 struct mmc_driver *drv = to_mmc_driver(dev->driver);
158 struct mmc_card *card = mmc_dev_to_card(dev);
161 if (dev->driver && drv->resume)
162 ret = drv->resume(card);
167 #ifdef CONFIG_PM_RUNTIME
169 static int mmc_runtime_suspend(struct device *dev)
171 struct mmc_card *card = mmc_dev_to_card(dev);
173 return mmc_power_save_host(card->host);
176 static int mmc_runtime_resume(struct device *dev)
178 struct mmc_card *card = mmc_dev_to_card(dev);
180 return mmc_power_restore_host(card->host);
183 static int mmc_runtime_idle(struct device *dev)
185 return pm_runtime_suspend(dev);
188 #endif /* !CONFIG_PM_RUNTIME */
190 static const struct dev_pm_ops mmc_bus_pm_ops = {
191 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume,
193 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
196 static struct bus_type mmc_bus_type = {
198 .dev_attrs = mmc_dev_attrs,
199 .match = mmc_bus_match,
200 .uevent = mmc_bus_uevent,
201 .probe = mmc_bus_probe,
202 .remove = mmc_bus_remove,
203 .shutdown = mmc_bus_shutdown,
204 .pm = &mmc_bus_pm_ops,
207 int mmc_register_bus(void)
209 return bus_register(&mmc_bus_type);
212 void mmc_unregister_bus(void)
214 bus_unregister(&mmc_bus_type);
218 * mmc_register_driver - register a media driver
219 * @drv: MMC media driver
221 int mmc_register_driver(struct mmc_driver *drv)
223 drv->drv.bus = &mmc_bus_type;
224 return driver_register(&drv->drv);
227 EXPORT_SYMBOL(mmc_register_driver);
230 * mmc_unregister_driver - unregister a media driver
231 * @drv: MMC media driver
233 void mmc_unregister_driver(struct mmc_driver *drv)
235 drv->drv.bus = &mmc_bus_type;
236 driver_unregister(&drv->drv);
239 EXPORT_SYMBOL(mmc_unregister_driver);
241 static void mmc_release_card(struct device *dev)
243 struct mmc_card *card = mmc_dev_to_card(dev);
245 sdio_free_common_cis(card);
253 * Allocate and initialise a new MMC card structure.
255 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
257 struct mmc_card *card;
259 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
261 return ERR_PTR(-ENOMEM);
265 device_initialize(&card->dev);
267 card->dev.parent = mmc_classdev(host);
268 card->dev.bus = &mmc_bus_type;
269 card->dev.release = mmc_release_card;
270 card->dev.type = type;
276 * Register a new MMC card with the driver model.
278 int mmc_add_card(struct mmc_card *card)
282 const char *uhs_bus_speed_mode = "";
283 static const char *const uhs_speeds[] = {
284 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
285 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
286 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
287 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
288 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
292 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
294 switch (card->type) {
300 if (mmc_card_blockaddr(card)) {
301 if (mmc_card_ext_capacity(card))
310 case MMC_TYPE_SD_COMBO:
312 if (mmc_card_blockaddr(card))
320 if (mmc_sd_card_uhs(card) &&
321 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
322 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
324 if (mmc_host_is_spi(card->host)) {
325 pr_info("%s: new %s%s%s card on SPI\n",
326 mmc_hostname(card->host),
327 mmc_card_highspeed(card) ? "high speed " : "",
328 mmc_card_ddr_mode(card) ? "DDR " : "",
331 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
332 mmc_hostname(card->host),
333 mmc_card_uhs(card) ? "ultra high speed " :
334 (mmc_card_highspeed(card) ? "high speed " : ""),
335 (mmc_card_hs200(card) ? "HS200 " : ""),
336 mmc_card_ddr_mode(card) ? "DDR " : "",
337 uhs_bus_speed_mode, type, card->rca);
340 #ifdef CONFIG_DEBUG_FS
341 mmc_add_card_debugfs(card);
343 mmc_init_context_info(card->host);
345 ret = device_add(&card->dev);
349 mmc_card_set_present(card);
355 * Unregister a new MMC card with the driver model, and
356 * (eventually) free it.
358 void mmc_remove_card(struct mmc_card *card)
360 #ifdef CONFIG_DEBUG_FS
361 mmc_remove_card_debugfs(card);
364 if (mmc_card_present(card)) {
365 if (mmc_host_is_spi(card->host)) {
366 pr_info("%s: SPI card removed\n",
367 mmc_hostname(card->host));
369 pr_info("%s: card %04x removed\n",
370 mmc_hostname(card->host), card->rca);
372 device_del(&card->dev);
375 put_device(&card->dev);