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 static ssize_t type_show(struct device *dev,
30 struct device_attribute *attr, char *buf)
32 struct mmc_card *card = mmc_dev_to_card(dev);
36 return sprintf(buf, "MMC\n");
38 return sprintf(buf, "SD\n");
40 return sprintf(buf, "SDIO\n");
41 case MMC_TYPE_SD_COMBO:
42 return sprintf(buf, "SDcombo\n");
47 static DEVICE_ATTR_RO(type);
49 static struct attribute *mmc_dev_attrs[] = {
53 ATTRIBUTE_GROUPS(mmc_dev);
56 * This currently matches any MMC driver to any MMC card - drivers
57 * themselves make the decision whether to drive this card in their
60 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
66 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
68 struct mmc_card *card = mmc_dev_to_card(dev);
82 case MMC_TYPE_SD_COMBO:
90 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
95 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
100 * Request the mmc_block device. Note: that this is a direct request
101 * for the module it carries no information as to what is inserted.
103 retval = add_uevent_var(env, "MODALIAS=mmc:block");
108 static void mmc_bus_shutdown(struct device *dev)
110 struct mmc_card *card = mmc_dev_to_card(dev);
111 struct mmc_host *host = card->host;
114 if (dev->driver && dev->driver->shutdown)
115 dev->driver->shutdown(dev);
117 if (host->bus_ops->shutdown) {
118 ret = host->bus_ops->shutdown(host);
120 pr_warn("%s: error %d during shutdown\n",
121 mmc_hostname(host), ret);
125 #ifdef CONFIG_PM_SLEEP
126 static int mmc_bus_suspend(struct device *dev)
128 struct mmc_card *card = mmc_dev_to_card(dev);
129 struct mmc_host *host = card->host;
132 ret = pm_generic_suspend(dev);
136 ret = host->bus_ops->suspend(host);
140 static int mmc_bus_resume(struct device *dev)
142 struct mmc_card *card = mmc_dev_to_card(dev);
143 struct mmc_host *host = card->host;
146 ret = host->bus_ops->resume(host);
148 pr_warn("%s: error %d during resume (card was removed?)\n",
149 mmc_hostname(host), ret);
151 ret = pm_generic_resume(dev);
157 static int mmc_runtime_suspend(struct device *dev)
159 struct mmc_card *card = mmc_dev_to_card(dev);
160 struct mmc_host *host = card->host;
162 return host->bus_ops->runtime_suspend(host);
165 static int mmc_runtime_resume(struct device *dev)
167 struct mmc_card *card = mmc_dev_to_card(dev);
168 struct mmc_host *host = card->host;
170 return host->bus_ops->runtime_resume(host);
172 #endif /* !CONFIG_PM */
174 static const struct dev_pm_ops mmc_bus_pm_ops = {
175 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, NULL)
176 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume)
179 static struct bus_type mmc_bus_type = {
181 .dev_groups = mmc_dev_groups,
182 .match = mmc_bus_match,
183 .uevent = mmc_bus_uevent,
184 .shutdown = mmc_bus_shutdown,
185 .pm = &mmc_bus_pm_ops,
188 int mmc_register_bus(void)
190 return bus_register(&mmc_bus_type);
193 void mmc_unregister_bus(void)
195 bus_unregister(&mmc_bus_type);
199 * mmc_register_driver - register a media driver
200 * @drv: MMC media driver
202 int mmc_register_driver(struct device_driver *drv)
204 drv->bus = &mmc_bus_type;
205 return driver_register(drv);
207 EXPORT_SYMBOL(mmc_register_driver);
210 * mmc_unregister_driver - unregister a media driver
211 * @drv: MMC media driver
213 void mmc_unregister_driver(struct device_driver *drv)
215 drv->bus = &mmc_bus_type;
216 driver_unregister(drv);
218 EXPORT_SYMBOL(mmc_unregister_driver);
220 static void mmc_release_card(struct device *dev)
222 struct mmc_card *card = mmc_dev_to_card(dev);
224 sdio_free_common_cis(card);
232 * Allocate and initialise a new MMC card structure.
234 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
236 struct mmc_card *card;
238 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
240 return ERR_PTR(-ENOMEM);
244 device_initialize(&card->dev);
246 card->dev.parent = mmc_classdev(host);
247 card->dev.bus = &mmc_bus_type;
248 card->dev.release = mmc_release_card;
249 card->dev.type = type;
255 * Register a new MMC card with the driver model.
257 int mmc_add_card(struct mmc_card *card)
261 const char *uhs_bus_speed_mode = "";
262 static const char *const uhs_speeds[] = {
263 [UHS_SDR12_BUS_SPEED] = "SDR12 ",
264 [UHS_SDR25_BUS_SPEED] = "SDR25 ",
265 [UHS_SDR50_BUS_SPEED] = "SDR50 ",
266 [UHS_SDR104_BUS_SPEED] = "SDR104 ",
267 [UHS_DDR50_BUS_SPEED] = "DDR50 ",
271 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
273 switch (card->type) {
279 if (mmc_card_blockaddr(card)) {
280 if (mmc_card_ext_capacity(card))
289 case MMC_TYPE_SD_COMBO:
291 if (mmc_card_blockaddr(card))
299 if (mmc_card_uhs(card) &&
300 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds)))
301 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed];
303 if (mmc_host_is_spi(card->host)) {
304 pr_info("%s: new %s%s%s card on SPI\n",
305 mmc_hostname(card->host),
306 mmc_card_hs(card) ? "high speed " : "",
307 mmc_card_ddr52(card) ? "DDR " : "",
310 pr_info("%s: new %s%s%s%s%s card at address %04x\n",
311 mmc_hostname(card->host),
312 mmc_card_uhs(card) ? "ultra high speed " :
313 (mmc_card_hs(card) ? "high speed " : ""),
314 mmc_card_hs400(card) ? "HS400 " :
315 (mmc_card_hs200(card) ? "HS200 " : ""),
316 mmc_card_ddr52(card) ? "DDR " : "",
317 uhs_bus_speed_mode, type, card->rca);
320 #ifdef CONFIG_DEBUG_FS
321 mmc_add_card_debugfs(card);
323 mmc_init_context_info(card->host);
325 card->dev.of_node = mmc_of_find_child_device(card->host, 0);
327 ret = device_add(&card->dev);
331 mmc_card_set_present(card);
337 * Unregister a new MMC card with the driver model, and
338 * (eventually) free it.
340 void mmc_remove_card(struct mmc_card *card)
342 #ifdef CONFIG_DEBUG_FS
343 mmc_remove_card_debugfs(card);
346 if (mmc_card_present(card)) {
347 if (mmc_host_is_spi(card->host)) {
348 pr_info("%s: SPI card removed\n",
349 mmc_hostname(card->host));
351 pr_info("%s: card %04x removed\n",
352 mmc_hostname(card->host), card->rca);
354 device_del(&card->dev);
355 of_node_put(card->dev.of_node);
358 put_device(&card->dev);