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/device.h>
15 #include <linux/err.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/host.h>
24 #define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev)
25 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
27 static ssize_t mmc_type_show(struct device *dev,
28 struct device_attribute *attr, char *buf)
30 struct mmc_card *card = dev_to_mmc_card(dev);
34 return sprintf(buf, "MMC\n");
36 return sprintf(buf, "SD\n");
38 return sprintf(buf, "SDIO\n");
44 static struct device_attribute mmc_dev_attrs[] = {
45 __ATTR(type, S_IRUGO, mmc_type_show, NULL),
50 * This currently matches any MMC driver to any MMC card - drivers
51 * themselves make the decision whether to drive this card in their
54 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
60 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
62 struct mmc_card *card = dev_to_mmc_card(dev);
81 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
86 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
91 static int mmc_bus_probe(struct device *dev)
93 struct mmc_driver *drv = to_mmc_driver(dev->driver);
94 struct mmc_card *card = dev_to_mmc_card(dev);
96 return drv->probe(card);
99 static int mmc_bus_remove(struct device *dev)
101 struct mmc_driver *drv = to_mmc_driver(dev->driver);
102 struct mmc_card *card = dev_to_mmc_card(dev);
109 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
111 struct mmc_driver *drv = to_mmc_driver(dev->driver);
112 struct mmc_card *card = dev_to_mmc_card(dev);
115 if (dev->driver && drv->suspend)
116 ret = drv->suspend(card, state);
120 static int mmc_bus_resume(struct device *dev)
122 struct mmc_driver *drv = to_mmc_driver(dev->driver);
123 struct mmc_card *card = dev_to_mmc_card(dev);
126 if (dev->driver && drv->resume)
127 ret = drv->resume(card);
131 static struct bus_type mmc_bus_type = {
133 .dev_attrs = mmc_dev_attrs,
134 .match = mmc_bus_match,
135 .uevent = mmc_bus_uevent,
136 .probe = mmc_bus_probe,
137 .remove = mmc_bus_remove,
138 .suspend = mmc_bus_suspend,
139 .resume = mmc_bus_resume,
142 int mmc_register_bus(void)
144 return bus_register(&mmc_bus_type);
147 void mmc_unregister_bus(void)
149 bus_unregister(&mmc_bus_type);
153 * mmc_register_driver - register a media driver
154 * @drv: MMC media driver
156 int mmc_register_driver(struct mmc_driver *drv)
158 drv->drv.bus = &mmc_bus_type;
159 return driver_register(&drv->drv);
162 EXPORT_SYMBOL(mmc_register_driver);
165 * mmc_unregister_driver - unregister a media driver
166 * @drv: MMC media driver
168 void mmc_unregister_driver(struct mmc_driver *drv)
170 drv->drv.bus = &mmc_bus_type;
171 driver_unregister(&drv->drv);
174 EXPORT_SYMBOL(mmc_unregister_driver);
176 static void mmc_release_card(struct device *dev)
178 struct mmc_card *card = dev_to_mmc_card(dev);
180 sdio_free_common_cis(card);
189 * Allocate and initialise a new MMC card structure.
191 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
193 struct mmc_card *card;
195 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
197 return ERR_PTR(-ENOMEM);
201 device_initialize(&card->dev);
203 card->dev.parent = mmc_classdev(host);
204 card->dev.bus = &mmc_bus_type;
205 card->dev.release = mmc_release_card;
206 card->dev.type = type;
212 * Register a new MMC card with the driver model.
214 int mmc_add_card(struct mmc_card *card)
219 snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
220 "%s:%04x", mmc_hostname(card->host), card->rca);
222 switch (card->type) {
228 if (mmc_card_blockaddr(card))
239 if (mmc_host_is_spi(card->host)) {
240 printk(KERN_INFO "%s: new %s%s card on SPI\n",
241 mmc_hostname(card->host),
242 mmc_card_highspeed(card) ? "high speed " : "",
245 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
246 mmc_hostname(card->host),
247 mmc_card_highspeed(card) ? "high speed " : "",
251 ret = device_add(&card->dev);
255 mmc_card_set_present(card);
261 * Unregister a new MMC card with the driver model, and
262 * (eventually) free it.
264 void mmc_remove_card(struct mmc_card *card)
266 if (mmc_card_present(card)) {
267 if (mmc_host_is_spi(card->host)) {
268 printk(KERN_INFO "%s: SPI card removed\n",
269 mmc_hostname(card->host));
271 printk(KERN_INFO "%s: card %04x removed\n",
272 mmc_hostname(card->host), card->rca);
274 device_del(&card->dev);
277 put_device(&card->dev);