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Commit 00b137cf authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[MMC] Add MMC class devices 



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: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent d366b643

drivers/mmc/mmc.c

+10 −13
Original line number Diff line number Diff line
@@ -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);

drivers/mmc/mmc.h

+5 −0
Original line number Diff line number Diff line
@@ -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

drivers/mmc/mmc_sysfs.c

+71 −1
Original line number Diff line number Diff line
@@ -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);

}

include/linux/mmc/host.h

+1 −0
Original line number Diff line number Diff line
@@ -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;