mango/dev/bus.c

#include <socks/device.h>
#include <socks/libc/stdio.h>

static struct queue all_buses;
static spin_lock_t all_buses_lock;

struct bus_device *bus_device_create(void)
{
	struct device *dev = device_alloc();
	if (!dev) {
		return NULL;
	}

	dev->dev_type = DEV_TYPE_BUS;

	return BUS_DEVICE(dev);
}

kern_status_t scan_all_buses(void)
{
	kern_status_t status = KERN_OK;

	/* keep interrupts enabled while scanning for devices */
	spin_lock(&all_buses_lock);

	queue_foreach(struct bus_device, bus, &all_buses, b_buslist) {
		if (bus->b_ops && bus->b_ops->scan) {
			status = bus->b_ops->scan(bus_device_base(bus));
		}

		if (status != KERN_OK) {
			break;
		}
	}

	spin_unlock(&all_buses_lock);
	return status;
}

static kern_status_t bus_device_register(struct device *dev)
{
	struct bus_device *bus = &dev->bus;

	unsigned long flags;
	spin_lock_irqsave(&all_buses_lock, &flags);
	queue_push_back(&all_buses, &bus->b_buslist);
	spin_unlock_irqrestore(&all_buses_lock, flags);

	char path[OBJECT_PATH_MAX];
	snprintf(path, sizeof path, "/dev/bus/%s", dev->dev_name);

	return object_namespace_create_link(global_namespace(), path, &dev->dev_base);
}

struct device_type_ops bus_type_ops = {
	.register_device = bus_device_register,
};