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 static ssize_t type_show(struct device *dev,
29 struct device_attribute *attr, char *buf)
31 struct mmc_card *card = mmc_dev_to_card(dev);
35 return sprintf(buf, "MMC\n");
37 return sprintf(buf, "SD\n");
39 return sprintf(buf, "SDIO\n");
40 case MMC_TYPE_SD_COMBO:
41 return sprintf(buf, "SDcombo\n");
46 static DEVICE_ATTR_RO(type);
48 static struct attribute *mmc_dev_attrs[] = {
52 ATTRIBUTE_GROUPS(mmc_dev);
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 void mmc_bus_shutdown(struct device *dev)
109 struct mmc_card *card = mmc_dev_to_card(dev);
110 struct mmc_host *host = card->host;
113 if (dev->driver && dev->driver->shutdown)
114 dev->driver->shutdown(dev);
116 if (host->bus_ops->shutdown) {
117 ret = host->bus_ops->shutdown(host);
119 pr_warn("%s: error %d during shutdown\n",
120 mmc_hostname(host), ret);
124 #ifdef CONFIG_PM_SLEEP
125 static int mmc_bus_suspend(struct device *dev)
127 struct mmc_card *card = mmc_dev_to_card(dev);
128 struct mmc_host *host = card->host;
131 ret = pm_generic_suspend(dev);
135 ret = host->bus_ops->suspend(host);
139 static int mmc_bus_resume(struct device *dev)
141 struct mmc_card *card = mmc_dev_to_card(dev);
142 struct mmc_host *host = card->host;
145 ret = host->bus_ops->resume(host);
147 pr_warn("%s: error %d during resume (card was removed?)\n",
148 mmc_hostname(host), ret);
150 ret = pm_generic_resume(dev);
155 #ifdef CONFIG_PM_RUNTIME
156 static int mmc_runtime_suspend(struct device *dev)
158 struct mmc_card *card = mmc_dev_to_card(dev);
159 struct mmc_host *host = card->host;
161 return host->bus_ops->runtime_suspend(host);
164 static int mmc_runtime_resume(struct device *dev)
166 struct mmc_card *card = mmc_dev_to_card(dev);
167 struct mmc_host *host = card->host;
169 return host->bus_ops->runtime_resume(host);
171 #endif /* !CONFIG_PM_RUNTIME */
173 static const struct dev_pm_ops mmc_bus_pm_ops = {
174 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
175 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
178 static struct bus_type mmc_bus_type = {
180 .dev_groups = mmc_dev_groups,
181 .match = mmc_bus_match,
182 .uevent = mmc_bus_uevent,
183 .shutdown = mmc_bus_shutdown,
184 .pm = &mmc_bus_pm_ops,
187 int mmc_register_bus(void)
189 return bus_register(&mmc_bus_type);
192 void mmc_unregister_bus(void)
194 bus_unregister(&mmc_bus_type);
198 * mmc_register_driver - register a media driver
199 * @drv: MMC media driver
201 int mmc_register_driver(struct device_driver *drv)
203 drv->bus = &mmc_bus_type;
204 return driver_register(drv);
206 EXPORT_SYMBOL(mmc_register_driver);
209 * mmc_unregister_driver - unregister a media driver
210 * @drv: MMC media driver
212 void mmc_unregister_driver(struct device_driver *drv)
214 drv->bus = &mmc_bus_type;
215 driver_unregister(drv);
217 EXPORT_SYMBOL(mmc_unregister_driver);
219 static void mmc_release_card(struct device *dev)
221 struct mmc_card *card = mmc_dev_to_card(dev);
223 sdio_free_common_cis(card);
231 * Allocate and initialise a new MMC card structure.
233 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
235 struct mmc_card *card;
237 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
239 return ERR_PTR(-ENOMEM);
243 device_initialize(&card->dev);
245 card->dev.parent = mmc_classdev(host);
246 card->dev.bus = &mmc_bus_type;
247 card->dev.release = mmc_release_card;
248 card->dev.type = type;
254 * Register a new MMC card with the driver model.
256 int mmc_add_card(struct mmc_card *card)
260 const char *uhs_bus_speed_mode = "";
261 static const char *const uhs_speeds[] = {
262 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
263 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
264 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
265 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
266 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
270 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
272 switch (card->type) {
278 if (mmc_card_blockaddr(card)) {
279 if (mmc_card_ext_capacity(card))
288 case MMC_TYPE_SD_COMBO:
290 if (mmc_card_blockaddr(card))
298 if (mmc_card_uhs(card) &&
299 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
300 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
302 if (mmc_host_is_spi(card->host)) {
303 pr_info("%s: new %s%s%s card on SPI\n",
304 mmc_hostname(card->host),
305 mmc_card_hs(card) ? "high speed " : "",
306 mmc_card_ddr52(card) ? "DDR " : "",
309 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
310 mmc_hostname(card->host),
311 mmc_card_uhs(card) ? "ultra high speed " :
312 (mmc_card_hs(card) ? "high speed " : ""),
313 mmc_card_hs400(card) ? "HS400 " :
314 (mmc_card_hs200(card) ? "HS200 " : ""),
315 mmc_card_ddr52(card) ? "DDR " : "",
316 uhs_bus_speed_mode, type, card->rca);
319 #ifdef CONFIG_DEBUG_FS
320 mmc_add_card_debugfs(card);
322 mmc_init_context_info(card->host);
324 ret = device_add(&card->dev);
328 mmc_card_set_present(card);
334 * Unregister a new MMC card with the driver model, and
335 * (eventually) free it.
337 void mmc_remove_card(struct mmc_card *card)
339 #ifdef CONFIG_DEBUG_FS
340 mmc_remove_card_debugfs(card);
343 if (mmc_card_present(card)) {
344 if (mmc_host_is_spi(card->host)) {
345 pr_info("%s: SPI card removed\n",
346 mmc_hostname(card->host));
348 pr_info("%s: card %04x removed\n",
349 mmc_hostname(card->host), card->rca);
351 device_del(&card->dev);
354 put_device(&card->dev);