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 int mmc_bus_suspend(struct device *dev, pm_message_t state)
127 struct mmc_driver *drv = to_mmc_driver(dev->driver);
128 struct mmc_card *card = mmc_dev_to_card(dev);
131 if (dev->driver && drv->suspend)
132 ret = drv->suspend(card, state);
136 static int mmc_bus_resume(struct device *dev)
138 struct mmc_driver *drv = to_mmc_driver(dev->driver);
139 struct mmc_card *card = mmc_dev_to_card(dev);
142 if (dev->driver && drv->resume)
143 ret = drv->resume(card);
147 #ifdef CONFIG_PM_RUNTIME
149 static int mmc_runtime_suspend(struct device *dev)
151 struct mmc_card *card = mmc_dev_to_card(dev);
153 return mmc_power_save_host(card->host);
156 static int mmc_runtime_resume(struct device *dev)
158 struct mmc_card *card = mmc_dev_to_card(dev);
160 return mmc_power_restore_host(card->host);
163 static int mmc_runtime_idle(struct device *dev)
165 return pm_runtime_suspend(dev);
168 static const struct dev_pm_ops mmc_bus_pm_ops = {
169 .runtime_suspend = mmc_runtime_suspend,
170 .runtime_resume = mmc_runtime_resume,
171 .runtime_idle = mmc_runtime_idle,
174 #define MMC_PM_OPS_PTR (&mmc_bus_pm_ops)
176 #else /* !CONFIG_PM_RUNTIME */
178 #define MMC_PM_OPS_PTR NULL
180 #endif /* !CONFIG_PM_RUNTIME */
182 static struct bus_type mmc_bus_type = {
184 .dev_attrs = mmc_dev_attrs,
185 .match = mmc_bus_match,
186 .uevent = mmc_bus_uevent,
187 .probe = mmc_bus_probe,
188 .remove = mmc_bus_remove,
189 .suspend = mmc_bus_suspend,
190 .resume = mmc_bus_resume,
191 .pm = MMC_PM_OPS_PTR,
194 int mmc_register_bus(void)
196 return bus_register(&mmc_bus_type);
199 void mmc_unregister_bus(void)
201 bus_unregister(&mmc_bus_type);
205 * mmc_register_driver - register a media driver
206 * @drv: MMC media driver
208 int mmc_register_driver(struct mmc_driver *drv)
210 drv->drv.bus = &mmc_bus_type;
211 return driver_register(&drv->drv);
214 EXPORT_SYMBOL(mmc_register_driver);
217 * mmc_unregister_driver - unregister a media driver
218 * @drv: MMC media driver
220 void mmc_unregister_driver(struct mmc_driver *drv)
222 drv->drv.bus = &mmc_bus_type;
223 driver_unregister(&drv->drv);
226 EXPORT_SYMBOL(mmc_unregister_driver);
228 static void mmc_release_card(struct device *dev)
230 struct mmc_card *card = mmc_dev_to_card(dev);
232 sdio_free_common_cis(card);
241 * Allocate and initialise a new MMC card structure.
243 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
245 struct mmc_card *card;
247 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
249 return ERR_PTR(-ENOMEM);
253 device_initialize(&card->dev);
255 card->dev.parent = mmc_classdev(host);
256 card->dev.bus = &mmc_bus_type;
257 card->dev.release = mmc_release_card;
258 card->dev.type = type;
264 * Register a new MMC card with the driver model.
266 int mmc_add_card(struct mmc_card *card)
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_host_is_spi(card->host)) {
300 pr_info("%s: new %s%s%s card on SPI\n",
301 mmc_hostname(card->host),
302 mmc_card_highspeed(card) ? "high speed " : "",
303 mmc_card_ddr_mode(card) ? "DDR " : "",
306 printk(KERN_INFO "%s: new %s%s%s card at address %04x\n",
307 mmc_hostname(card->host),
308 mmc_sd_card_uhs(card) ? "ultra high speed " :
309 (mmc_card_highspeed(card) ? "high speed " : ""),
310 mmc_card_ddr_mode(card) ? "DDR " : "",
314 #ifdef CONFIG_DEBUG_FS
315 mmc_add_card_debugfs(card);
318 ret = device_add(&card->dev);
322 mmc_card_set_present(card);
328 * Unregister a new MMC card with the driver model, and
329 * (eventually) free it.
331 void mmc_remove_card(struct mmc_card *card)
333 #ifdef CONFIG_DEBUG_FS
334 mmc_remove_card_debugfs(card);
337 if (mmc_card_present(card)) {
338 if (mmc_host_is_spi(card->host)) {
339 pr_info("%s: SPI card removed\n",
340 mmc_hostname(card->host));
342 pr_info("%s: card %04x removed\n",
343 mmc_hostname(card->host), card->rca);
345 device_del(&card->dev);
348 put_device(&card->dev);