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[MMC] Add MMC class devices

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Create a mmc_host class to allow enumeration of MMC host controllers
even though they have no card(s) inserted.

Patch based on work by Pierre Ossman.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-08-19 09:41:24 +01:00 committed by Russell King
parent d366b64363
commit 00b137cfda
4 changed files with 87 additions and 14 deletions
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19
drivers/mmc/mmc.c
View File

@ -796,17 +796,13 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
{
struct mmc_host *host;
host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
host = mmc_alloc_host_sysfs(extra, dev);
if (host) {
memset(host, 0, sizeof(struct mmc_host) + extra);
spin_lock_init(&host->lock);
init_waitqueue_head(&host->wq);
INIT_LIST_HEAD(&host->cards);
INIT_WORK(&host->detect, mmc_rescan, host);
host->dev = dev;
/*
* By default, hosts do not support SGIO or large requests.
* They have to set these according to their abilities.
@ -828,15 +824,15 @@ EXPORT_SYMBOL(mmc_alloc_host);
*/
int mmc_add_host(struct mmc_host *host)
{
static unsigned int host_num;
snprintf(host->host_name, sizeof(host->host_name),
"mmc%d", host_num++);
int ret;
ret = mmc_add_host_sysfs(host);
if (ret == 0) {
mmc_power_off(host);
mmc_detect_change(host);
}
return 0;
return ret;
}
EXPORT_SYMBOL(mmc_add_host);
@ -859,6 +855,7 @@ void mmc_remove_host(struct mmc_host *host)
}
mmc_power_off(host);
mmc_remove_host_sysfs(host);
}
EXPORT_SYMBOL(mmc_remove_host);
@ -872,7 +869,7 @@ EXPORT_SYMBOL(mmc_remove_host);
void mmc_free_host(struct mmc_host *host)
{
flush_scheduled_work();
kfree(host);
mmc_free_host_sysfs(host);
}
EXPORT_SYMBOL(mmc_free_host);

5
drivers/mmc/mmc.h
View File

@ -13,4 +13,9 @@
void mmc_init_card(struct mmc_card *card, struct mmc_host *host);
int mmc_register_card(struct mmc_card *card);
void mmc_remove_card(struct mmc_card *card);
struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev);
int mmc_add_host_sysfs(struct mmc_host *host);
void mmc_remove_host_sysfs(struct mmc_host *host);
void mmc_free_host_sysfs(struct mmc_host *host);
#endif

72
drivers/mmc/mmc_sysfs.c
View File

@ -20,6 +20,7 @@
#define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev)
#define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
#define MMC_ATTR(name, fmt, args...) \
static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf) \
@ -224,13 +225,82 @@ void mmc_remove_card(struct mmc_card *card)
}
static void mmc_host_classdev_release(struct class_device *dev)
{
struct mmc_host *host = cls_dev_to_mmc_host(dev);
kfree(host);
}
static struct class mmc_host_class = {
.name = "mmc_host",
.release = mmc_host_classdev_release,
};
/*
* Internal function. Allocate a new MMC host.
*/
struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
{
struct mmc_host *host;
host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
if (host) {
memset(host, 0, sizeof(struct mmc_host) + extra);
host->dev = dev;
host->class_dev.dev = host->dev;
host->class_dev.class = &mmc_host_class;
class_device_initialize(&host->class_dev);
}
return host;
}
/*
* Internal function. Register a new MMC host with the MMC class.
*/
int mmc_add_host_sysfs(struct mmc_host *host)
{
static unsigned int host_num;
snprintf(host->host_name, sizeof(host->host_name),
"mmc%d", host_num++);
strlcpy(host->class_dev.class_id, host->host_name, BUS_ID_SIZE);
return class_device_add(&host->class_dev);
}
/*
* Internal function. Unregister a MMC host with the MMC class.
*/
void mmc_remove_host_sysfs(struct mmc_host *host)
{
class_device_del(&host->class_dev);
}
/*
* Internal function. Free a MMC host.
*/
void mmc_free_host_sysfs(struct mmc_host *host)
{
class_device_put(&host->class_dev);
}
static int __init mmc_init(void)
{
return bus_register(&mmc_bus_type);
int ret = bus_register(&mmc_bus_type);
if (ret == 0) {
ret = class_register(&mmc_host_class);
if (ret)
bus_unregister(&mmc_bus_type);
}
return ret;
}
static void __exit mmc_exit(void)
{
class_unregister(&mmc_host_class);
bus_unregister(&mmc_bus_type);
}

1
include/linux/mmc/host.h
View File

@ -63,6 +63,7 @@ struct device;
struct mmc_host {
struct device *dev;
struct class_device class_dev;
struct mmc_host_ops *ops;
unsigned int f_min;
unsigned int f_max;