drivers/mmc/core/bus.c

Source file repositories/reference/linux-study-clean/drivers/mmc/core/bus.c

File Facts

System
Linux kernel
Corpus path
drivers/mmc/core/bus.c
Extension
.c
Size
9408 bytes
Lines
430
Domain
Driver Families
Bucket
drivers/mmc
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct bus_type mmc_bus_type = {
	.name		= "mmc",
	.dev_groups	= mmc_dev_groups,
	.uevent		= mmc_bus_uevent,
	.probe		= mmc_bus_probe,
	.remove		= mmc_bus_remove,
	.shutdown	= mmc_bus_shutdown,
	.pm		= &mmc_bus_pm_ops,
};

int mmc_register_bus(void)
{
	return bus_register(&mmc_bus_type);
}

void mmc_unregister_bus(void)
{
	bus_unregister(&mmc_bus_type);
}

/**
 *	mmc_register_driver - register a media driver
 *	@drv: MMC media driver
 */
int mmc_register_driver(struct mmc_driver *drv)
{
	drv->drv.bus = &mmc_bus_type;
	return driver_register(&drv->drv);
}

EXPORT_SYMBOL(mmc_register_driver);

/**
 *	mmc_unregister_driver - unregister a media driver
 *	@drv: MMC media driver
 */
void mmc_unregister_driver(struct mmc_driver *drv)
{
	drv->drv.bus = &mmc_bus_type;
	driver_unregister(&drv->drv);
}

EXPORT_SYMBOL(mmc_unregister_driver);

static void mmc_release_card(struct device *dev)
{
	struct mmc_card *card = mmc_dev_to_card(dev);

	sdio_free_common_cis(card);

	kfree(card->info);

	kfree(card);
}

/*
 * Allocate and initialise a new MMC card structure.
 */
struct mmc_card *mmc_alloc_card(struct mmc_host *host, const struct device_type *type)
{
	struct mmc_card *card;

	card = kzalloc_obj(struct mmc_card);
	if (!card)
		return ERR_PTR(-ENOMEM);

	card->host = host;

	device_initialize(&card->dev);

	card->dev.parent = mmc_classdev(host);
	card->dev.bus = &mmc_bus_type;
	card->dev.release = mmc_release_card;
	card->dev.type = type;

	return card;
}

/*
 * Register a new MMC card with the driver model.
 */
int mmc_add_card(struct mmc_card *card)
{
	int ret;
	const char *type;
	const char *speed_mode = "";
	const char *uhs_bus_speed_mode = "";
	static const char *const uhs_speeds[] = {
		[UHS_SDR12_BUS_SPEED] = "SDR12 ",
		[UHS_SDR25_BUS_SPEED] = "SDR25 ",

Annotation

Implementation Notes