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");
42 static struct device_attribute mmc_dev_attrs[] = {
48 * This currently matches any MMC driver to any MMC card - drivers
49 * themselves make the decision whether to drive this card in their
52 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
58 mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
61 struct mmc_card *card = dev_to_mmc_card(dev);
62 int retval = 0, i = 0, length = 0;
64 #define add_env(fmt,val) do { \
65 retval = add_uevent_var(envp, num_envp, &i, \
66 buf, buf_size, &length, \
74 add_env("MMC_TYPE=%s", "MMC");
77 add_env("MMC_TYPE=%s", "SD");
81 add_env("MMC_NAME=%s", mmc_card_name(card));
90 static int mmc_bus_probe(struct device *dev)
92 struct mmc_driver *drv = to_mmc_driver(dev->driver);
93 struct mmc_card *card = dev_to_mmc_card(dev);
95 return drv->probe(card);
98 static int mmc_bus_remove(struct device *dev)
100 struct mmc_driver *drv = to_mmc_driver(dev->driver);
101 struct mmc_card *card = dev_to_mmc_card(dev);
108 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
110 struct mmc_driver *drv = to_mmc_driver(dev->driver);
111 struct mmc_card *card = dev_to_mmc_card(dev);
114 if (dev->driver && drv->suspend)
115 ret = drv->suspend(card, state);
119 static int mmc_bus_resume(struct device *dev)
121 struct mmc_driver *drv = to_mmc_driver(dev->driver);
122 struct mmc_card *card = dev_to_mmc_card(dev);
125 if (dev->driver && drv->resume)
126 ret = drv->resume(card);
130 static struct bus_type mmc_bus_type = {
132 .dev_attrs = mmc_dev_attrs,
133 .match = mmc_bus_match,
134 .uevent = mmc_bus_uevent,
135 .probe = mmc_bus_probe,
136 .remove = mmc_bus_remove,
137 .suspend = mmc_bus_suspend,
138 .resume = mmc_bus_resume,
141 int mmc_register_bus(void)
143 return bus_register(&mmc_bus_type);
146 void mmc_unregister_bus(void)
148 bus_unregister(&mmc_bus_type);
152 * mmc_register_driver - register a media driver
153 * @drv: MMC media driver
155 int mmc_register_driver(struct mmc_driver *drv)
157 drv->drv.bus = &mmc_bus_type;
158 return driver_register(&drv->drv);
161 EXPORT_SYMBOL(mmc_register_driver);
164 * mmc_unregister_driver - unregister a media driver
165 * @drv: MMC media driver
167 void mmc_unregister_driver(struct mmc_driver *drv)
169 drv->drv.bus = &mmc_bus_type;
170 driver_unregister(&drv->drv);
173 EXPORT_SYMBOL(mmc_unregister_driver);
175 static void mmc_release_card(struct device *dev)
177 struct mmc_card *card = dev_to_mmc_card(dev);
183 * Allocate and initialise a new MMC card structure.
185 struct mmc_card *mmc_alloc_card(struct mmc_host *host)
187 struct mmc_card *card;
189 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
191 return ERR_PTR(-ENOMEM);
195 device_initialize(&card->dev);
197 card->dev.parent = mmc_classdev(host);
198 card->dev.bus = &mmc_bus_type;
199 card->dev.release = mmc_release_card;
205 * Register a new MMC card with the driver model.
207 int mmc_add_card(struct mmc_card *card)
212 snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
213 "%s:%04x", mmc_hostname(card->host), card->rca);
215 switch (card->type) {
221 if (mmc_card_blockaddr(card))
229 printk(KERN_INFO "%s: new %s%s card at address %04x\n",
230 mmc_hostname(card->host),
231 mmc_card_highspeed(card) ? "high speed " : "",
234 card->dev.uevent_suppress = 1;
236 ret = device_add(&card->dev);
240 if (card->host->bus_ops->sysfs_add) {
241 ret = card->host->bus_ops->sysfs_add(card->host, card);
243 device_del(&card->dev);
248 card->dev.uevent_suppress = 0;
250 kobject_uevent(&card->dev.kobj, KOBJ_ADD);
252 mmc_card_set_present(card);
258 * Unregister a new MMC card with the driver model, and
259 * (eventually) free it.
261 void mmc_remove_card(struct mmc_card *card)
263 if (mmc_card_present(card)) {
264 printk(KERN_INFO "%s: card %04x removed\n",
265 mmc_hostname(card->host), card->rca);
267 if (card->host->bus_ops->sysfs_remove)
268 card->host->bus_ops->sysfs_remove(card->host, card);
269 device_del(&card->dev);
272 put_device(&card->dev);