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>
16 #include <linux/slab.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/host.h>
25 #define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev)
26 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
28 static ssize_t mmc_type_show(struct device *dev,
29 struct device_attribute *attr, char *buf)
31 struct mmc_card *card = dev_to_mmc_card(dev);
35 return sprintf(buf, "MMC\n");
37 return sprintf(buf, "SD\n");
39 return sprintf(buf, "SDIO\n");
45 static struct device_attribute mmc_dev_attrs[] = {
46 __ATTR(type, S_IRUGO, mmc_type_show, NULL),
51 * This currently matches any MMC driver to any MMC card - drivers
52 * themselves make the decision whether to drive this card in their
55 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
61 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
63 struct mmc_card *card = dev_to_mmc_card(dev);
82 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
87 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
92 * Request the mmc_block device. Note: that this is a direct request
93 * for the module it carries no information as to what is inserted.
95 retval = add_uevent_var(env, "MODALIAS=mmc:block");
100 static int mmc_bus_probe(struct device *dev)
102 struct mmc_driver *drv = to_mmc_driver(dev->driver);
103 struct mmc_card *card = dev_to_mmc_card(dev);
105 return drv->probe(card);
108 static int mmc_bus_remove(struct device *dev)
110 struct mmc_driver *drv = to_mmc_driver(dev->driver);
111 struct mmc_card *card = dev_to_mmc_card(dev);
118 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
120 struct mmc_driver *drv = to_mmc_driver(dev->driver);
121 struct mmc_card *card = dev_to_mmc_card(dev);
124 if (dev->driver && drv->suspend)
125 ret = drv->suspend(card, state);
129 static int mmc_bus_resume(struct device *dev)
131 struct mmc_driver *drv = to_mmc_driver(dev->driver);
132 struct mmc_card *card = dev_to_mmc_card(dev);
135 if (dev->driver && drv->resume)
136 ret = drv->resume(card);
140 static struct bus_type mmc_bus_type = {
142 .dev_attrs = mmc_dev_attrs,
143 .match = mmc_bus_match,
144 .uevent = mmc_bus_uevent,
145 .probe = mmc_bus_probe,
146 .remove = mmc_bus_remove,
147 .suspend = mmc_bus_suspend,
148 .resume = mmc_bus_resume,
151 int mmc_register_bus(void)
153 return bus_register(&mmc_bus_type);
156 void mmc_unregister_bus(void)
158 bus_unregister(&mmc_bus_type);
162 * mmc_register_driver - register a media driver
163 * @drv: MMC media driver
165 int mmc_register_driver(struct mmc_driver *drv)
167 drv->drv.bus = &mmc_bus_type;
168 return driver_register(&drv->drv);
171 EXPORT_SYMBOL(mmc_register_driver);
174 * mmc_unregister_driver - unregister a media driver
175 * @drv: MMC media driver
177 void mmc_unregister_driver(struct mmc_driver *drv)
179 drv->drv.bus = &mmc_bus_type;
180 driver_unregister(&drv->drv);
183 EXPORT_SYMBOL(mmc_unregister_driver);
185 static void mmc_release_card(struct device *dev)
187 struct mmc_card *card = dev_to_mmc_card(dev);
189 sdio_free_common_cis(card);
198 * Allocate and initialise a new MMC card structure.
200 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
202 struct mmc_card *card;
204 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
206 return ERR_PTR(-ENOMEM);
210 device_initialize(&card->dev);
212 card->dev.parent = mmc_classdev(host);
213 card->dev.bus = &mmc_bus_type;
214 card->dev.release = mmc_release_card;
215 card->dev.type = type;
221 * Register a new MMC card with the driver model.
223 int mmc_add_card(struct mmc_card *card)
228 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
230 switch (card->type) {
236 if (mmc_card_blockaddr(card))
247 if (mmc_host_is_spi(card->host)) {
248 printk(KERN_INFO "%s: new %s%s card on SPI\n",
249 mmc_hostname(card->host),
250 mmc_card_highspeed(card) ? "high speed " : "",
253 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
254 mmc_hostname(card->host),
255 mmc_card_highspeed(card) ? "high speed " : "",
259 ret = device_add(&card->dev);
263 #ifdef CONFIG_DEBUG_FS
264 mmc_add_card_debugfs(card);
267 mmc_card_set_present(card);
273 * Unregister a new MMC card with the driver model, and
274 * (eventually) free it.
276 void mmc_remove_card(struct mmc_card *card)
278 #ifdef CONFIG_DEBUG_FS
279 mmc_remove_card_debugfs(card);
282 if (mmc_card_present(card)) {
283 if (mmc_host_is_spi(card->host)) {
284 printk(KERN_INFO "%s: SPI card removed\n",
285 mmc_hostname(card->host));
287 printk(KERN_INFO "%s: card %04x removed\n",
288 mmc_hostname(card->host), card->rca);
290 device_del(&card->dev);
293 put_device(&card->dev);