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>
17 #include <linux/pm_runtime.h>
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/host.h>
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 = mmc_dev_to_card(dev);
35 return sprintf(buf, "MMC\n");
37 return sprintf(buf, "SD\n");
39 return sprintf(buf, "SDIO\n");
40 case MMC_TYPE_SD_COMBO:
41 return sprintf(buf, "SDcombo\n");
47 static struct device_attribute mmc_dev_attrs[] = {
48 __ATTR(type, S_IRUGO, mmc_type_show, NULL),
53 * This currently matches any MMC driver to any MMC card - drivers
54 * themselves make the decision whether to drive this card in their
57 static int mmc_bus_match(struct device *dev, struct device_driver *drv)
63 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
65 struct mmc_card *card = mmc_dev_to_card(dev);
79 case MMC_TYPE_SD_COMBO:
87 retval = add_uevent_var(env, "MMC_TYPE=%s", type);
92 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
97 * Request the mmc_block device. Note: that this is a direct request
98 * for the module it carries no information as to what is inserted.
100 retval = add_uevent_var(env, "MODALIAS=mmc:block");
105 static int mmc_bus_probe(struct device *dev)
107 struct mmc_driver *drv = to_mmc_driver(dev->driver);
108 struct mmc_card *card = mmc_dev_to_card(dev);
110 return drv->probe(card);
113 static int mmc_bus_remove(struct device *dev)
115 struct mmc_driver *drv = to_mmc_driver(dev->driver);
116 struct mmc_card *card = mmc_dev_to_card(dev);
123 static int mmc_bus_suspend(struct device *dev, pm_message_t state)
125 struct mmc_driver *drv = to_mmc_driver(dev->driver);
126 struct mmc_card *card = mmc_dev_to_card(dev);
129 if (dev->driver && drv->suspend)
130 ret = drv->suspend(card, state);
134 static int mmc_bus_resume(struct device *dev)
136 struct mmc_driver *drv = to_mmc_driver(dev->driver);
137 struct mmc_card *card = mmc_dev_to_card(dev);
140 if (dev->driver && drv->resume)
141 ret = drv->resume(card);
145 #ifdef CONFIG_PM_RUNTIME
147 static int mmc_runtime_suspend(struct device *dev)
149 struct mmc_card *card = mmc_dev_to_card(dev);
151 return mmc_power_save_host(card->host);
154 static int mmc_runtime_resume(struct device *dev)
156 struct mmc_card *card = mmc_dev_to_card(dev);
158 return mmc_power_restore_host(card->host);
161 static int mmc_runtime_idle(struct device *dev)
163 return pm_runtime_suspend(dev);
166 static const struct dev_pm_ops mmc_bus_pm_ops = {
167 .runtime_suspend = mmc_runtime_suspend,
168 .runtime_resume = mmc_runtime_resume,
169 .runtime_idle = mmc_runtime_idle,
172 #define MMC_PM_OPS_PTR (&mmc_bus_pm_ops)
174 #else /* !CONFIG_PM_RUNTIME */
176 #define MMC_PM_OPS_PTR NULL
178 #endif /* !CONFIG_PM_RUNTIME */
180 static struct bus_type mmc_bus_type = {
182 .dev_attrs = mmc_dev_attrs,
183 .match = mmc_bus_match,
184 .uevent = mmc_bus_uevent,
185 .probe = mmc_bus_probe,
186 .remove = mmc_bus_remove,
187 .suspend = mmc_bus_suspend,
188 .resume = mmc_bus_resume,
189 .pm = MMC_PM_OPS_PTR,
192 int mmc_register_bus(void)
194 return bus_register(&mmc_bus_type);
197 void mmc_unregister_bus(void)
199 bus_unregister(&mmc_bus_type);
203 * mmc_register_driver - register a media driver
204 * @drv: MMC media driver
206 int mmc_register_driver(struct mmc_driver *drv)
208 drv->drv.bus = &mmc_bus_type;
209 return driver_register(&drv->drv);
212 EXPORT_SYMBOL(mmc_register_driver);
215 * mmc_unregister_driver - unregister a media driver
216 * @drv: MMC media driver
218 void mmc_unregister_driver(struct mmc_driver *drv)
220 drv->drv.bus = &mmc_bus_type;
221 driver_unregister(&drv->drv);
224 EXPORT_SYMBOL(mmc_unregister_driver);
226 static void mmc_release_card(struct device *dev)
228 struct mmc_card *card = mmc_dev_to_card(dev);
230 sdio_free_common_cis(card);
239 * Allocate and initialise a new MMC card structure.
241 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
243 struct mmc_card *card;
245 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
247 return ERR_PTR(-ENOMEM);
251 device_initialize(&card->dev);
253 card->dev.parent = mmc_classdev(host);
254 card->dev.bus = &mmc_bus_type;
255 card->dev.release = mmc_release_card;
256 card->dev.type = type;
262 * Register a new MMC card with the driver model.
264 int mmc_add_card(struct mmc_card *card)
269 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
271 switch (card->type) {
277 if (mmc_card_blockaddr(card)) {
278 if (mmc_card_ext_capacity(card))
287 case MMC_TYPE_SD_COMBO:
289 if (mmc_card_blockaddr(card))
297 if (mmc_host_is_spi(card->host)) {
298 pr_info("%s: new %s%s%s card on SPI\n",
299 mmc_hostname(card->host),
300 mmc_card_highspeed(card) ? "high speed " : "",
301 mmc_card_ddr_mode(card) ? "DDR " : "",
304 printk(KERN_INFO "%s: new %s%s%s card at address %04x\n",
305 mmc_hostname(card->host),
306 mmc_sd_card_uhs(card) ? "ultra high speed " :
307 (mmc_card_highspeed(card) ? "high speed " : ""),
308 mmc_card_ddr_mode(card) ? "DDR " : "",
312 #ifdef CONFIG_DEBUG_FS
313 mmc_add_card_debugfs(card);
316 ret = device_add(&card->dev);
320 mmc_card_set_present(card);
326 * Unregister a new MMC card with the driver model, and
327 * (eventually) free it.
329 void mmc_remove_card(struct mmc_card *card)
331 #ifdef CONFIG_DEBUG_FS
332 mmc_remove_card_debugfs(card);
335 if (mmc_card_present(card)) {
336 if (mmc_host_is_spi(card->host)) {
337 pr_info("%s: SPI card removed\n",
338 mmc_hostname(card->host));
340 pr_info("%s: card %04x removed\n",
341 mmc_hostname(card->host), card->rca);
343 device_del(&card->dev);
346 put_device(&card->dev);