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>
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[] = {
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, char **envp, int num_envp, char *buf,
64 struct mmc_card *card = dev_to_mmc_card(dev);
66 int i = 0, length = 0;
83 if (add_uevent_var(envp, num_envp, &i,
84 buf, buf_size, &length,
89 if (add_uevent_var(envp, num_envp, &i,
90 buf, buf_size, &length,
91 "MMC_NAME=%s", mmc_card_name(card)))
99 static int mmc_bus_probe(struct device *dev)
101 struct mmc_driver *drv = to_mmc_driver(dev->driver);
102 struct mmc_card *card = dev_to_mmc_card(dev);
104 return drv->probe(card);
107 static int mmc_bus_remove(struct device *dev)
109 struct mmc_driver *drv = to_mmc_driver(dev->driver);
110 struct mmc_card *card = dev_to_mmc_card(dev);
117 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
119 struct mmc_driver *drv = to_mmc_driver(dev->driver);
120 struct mmc_card *card = dev_to_mmc_card(dev);
123 if (dev->driver && drv->suspend)
124 ret = drv->suspend(card, state);
128 static int mmc_bus_resume(struct device *dev)
130 struct mmc_driver *drv = to_mmc_driver(dev->driver);
131 struct mmc_card *card = dev_to_mmc_card(dev);
134 if (dev->driver && drv->resume)
135 ret = drv->resume(card);
139 static struct bus_type mmc_bus_type = {
141 .dev_attrs = mmc_dev_attrs,
142 .match = mmc_bus_match,
143 .uevent = mmc_bus_uevent,
144 .probe = mmc_bus_probe,
145 .remove = mmc_bus_remove,
146 .suspend = mmc_bus_suspend,
147 .resume = mmc_bus_resume,
150 int mmc_register_bus(void)
152 return bus_register(&mmc_bus_type);
155 void mmc_unregister_bus(void)
157 bus_unregister(&mmc_bus_type);
161 * mmc_register_driver - register a media driver
162 * @drv: MMC media driver
164 int mmc_register_driver(struct mmc_driver *drv)
166 drv->drv.bus = &mmc_bus_type;
167 return driver_register(&drv->drv);
170 EXPORT_SYMBOL(mmc_register_driver);
173 * mmc_unregister_driver - unregister a media driver
174 * @drv: MMC media driver
176 void mmc_unregister_driver(struct mmc_driver *drv)
178 drv->drv.bus = &mmc_bus_type;
179 driver_unregister(&drv->drv);
182 EXPORT_SYMBOL(mmc_unregister_driver);
184 static void mmc_release_card(struct device *dev)
186 struct mmc_card *card = dev_to_mmc_card(dev);
188 sdio_free_common_cis(card);
197 * Allocate and initialise a new MMC card structure.
199 struct mmc_card *mmc_alloc_card(struct mmc_host *host)
201 struct mmc_card *card;
203 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
205 return ERR_PTR(-ENOMEM);
209 device_initialize(&card->dev);
211 card->dev.parent = mmc_classdev(host);
212 card->dev.bus = &mmc_bus_type;
213 card->dev.release = mmc_release_card;
219 * Register a new MMC card with the driver model.
221 int mmc_add_card(struct mmc_card *card)
226 snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
227 "%s:%04x", mmc_hostname(card->host), card->rca);
229 switch (card->type) {
235 if (mmc_card_blockaddr(card))
246 if (mmc_host_is_spi(card->host)) {
247 printk(KERN_INFO "%s: new %s%s card on SPI\n",
248 mmc_hostname(card->host),
249 mmc_card_highspeed(card) ? "high speed " : "",
252 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
253 mmc_hostname(card->host),
254 mmc_card_highspeed(card) ? "high speed " : "",
258 card->dev.uevent_suppress = 1;
260 ret = device_add(&card->dev);
264 if (card->host->bus_ops->sysfs_add) {
265 ret = card->host->bus_ops->sysfs_add(card->host, card);
267 device_del(&card->dev);
272 card->dev.uevent_suppress = 0;
274 kobject_uevent(&card->dev.kobj, KOBJ_ADD);
276 mmc_card_set_present(card);
282 * Unregister a new MMC card with the driver model, and
283 * (eventually) free it.
285 void mmc_remove_card(struct mmc_card *card)
287 if (mmc_card_present(card)) {
288 if (mmc_host_is_spi(card->host)) {
289 printk(KERN_INFO "%s: SPI card removed\n",
290 mmc_hostname(card->host));
292 printk(KERN_INFO "%s: card %04x removed\n",
293 mmc_hostname(card->host), card->rca);
296 if (card->host->bus_ops->sysfs_remove)
297 card->host->bus_ops->sysfs_remove(card->host, card);
298 device_del(&card->dev);
301 put_device(&card->dev);