AP6255 wifi sdio识别过程

1、sdio子设备识别添加： 

mmc_attach_sdio
    sdio_add_func

int sdio_add_func(struct sdio_func *func)
{
	int ret;

	dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);

	sdio_set_of_node(func);
	ret = device_add(&func->dev);
    ......
}

static void sdio_set_of_node(struct sdio_func *func)
{
	struct mmc_host *host = func->card->host;

	func->dev.of_node = mmc_of_find_child_device(host, func->num);
}

struct device_node *mmc_of_find_child_device(struct mmc_host *host,
		unsigned func_num)
{
	struct device_node *node;

	for_each_child_of_node(host->parent->of_node, node) {
		if (mmc_of_get_func_num(node) == func_num)
			return node;
	}

}

func_num值是：

static int mmc_of_get_func_num(struct device_node *node)
{
	u32 reg;
    of_property_read_u32(node, "reg", &reg);
	return reg;
}

/*
 * SDIO function devices
 */
struct sdio_func {
	struct mmc_card		*card;		/* the card this device belongs to */
	struct device		dev;		/* the device */
    ......
}

2、设备驱动匹配：

static struct bus_type sdio_bus_type = {
	.name		= "sdio",
	.dev_groups	= sdio_dev_groups,
	.match		= sdio_bus_match,
	.uevent		= sdio_bus_uevent,
	.probe		= sdio_bus_probe,
	.remove		= sdio_bus_remove,
	.pm		= &sdio_bus_pm_ops,
};

static int sdio_bus_probe(struct device *dev)
{
	struct sdio_driver *drv = to_sdio_driver(dev->driver);
	struct sdio_func *func = dev_to_sdio_func(dev);
	const struct sdio_device_id *id;

	id = sdio_match_device(func, drv);
    ......
	drv->probe(func, id);
    ......
	return 0;
}

static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
	struct sdio_driver *sdrv)
{
	const struct sdio_device_id *ids;

	ids = sdrv->id_table;

	if (ids) {
		while (ids->class || ids->vendor || ids->device) {
			if (sdio_match_one(func, ids))
				return ids;
			ids++;
		}
	}

	return NULL;
}

#define SDIO_ANY_ID (~0)

static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
	const struct sdio_device_id *id)
{
	if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
		return NULL;
	if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
		return NULL;
	if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
		return NULL;
	return id;
}

3、sdio子设备驱动注册：

struct sdio_device_id bcmsdh_sdmmc_ids[]={
    {SDIO_DEVICE(...,...)},

};

struct sdio_driver bcmsdh_sdmmc_driver={
    .probe=xxx_probe,
    .id=bcmsdh_sdmmc_ids,
};

sdio_register_driver(&bcmsdh_sdmmc_driver);

最后

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