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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* drivers/base/core.cc — device core.
*
* Mirrors Linux drivers/base/core.c (greatly simplified). Provides
* device_initialize, device_register, device_unregister, and the
* try_bind helper shared with driver registration.
*
* Reference: docs/specs/storage_stack.md §4.3
*/
#include <lume/device.h>
#include <lume/container_of.h>
#include <lume/klog.h>
#include <lume/kprintf.h>
#include <lume/errno.h>
#include <lume/list.h>
/* ------------------------------------------------------------------ */
/* device ktype — generic release (no-op; subclasses override) */
/* ------------------------------------------------------------------ */
static void device_release(kobject* kobj)
{
/* Concrete device flavors (platform_device, virtio_device, ...) are
* expected to allocate via kmalloc and free in their own release
* paths after device_unregister + final kobject_put. The generic
* device kobj_type only fires for stack-allocated devices used in
* tests — nothing to do. */
(void)kobj;
}
static const kobj_type device_ktype = {
.release = device_release,
};
/* ------------------------------------------------------------------ */
/* device_initialize / device_register */
/* ------------------------------------------------------------------ */
void device_initialize(device* dev)
{
if (dev == nullptr) {
return;
}
kobject_init(&dev->kobj, &device_ktype);
dev->parent = nullptr;
dev->driver = nullptr;
dev->driver_data = nullptr;
dev->platform_data = nullptr;
dev->devt = 0;
dev->bus_list.init();
dev->driver_list.init();
}
const char* dev_name(const device* dev)
{
if (dev == nullptr) {
return "(null)";
}
if (dev->kobj.name != nullptr) {
return dev->kobj.name;
}
if (dev->init_name != nullptr) {
return dev->init_name;
}
return "(unnamed)";
}
/* try_bind: attempt to match `dev` against `drv` and probe.
* Returns 1 on successful bind, 0 otherwise.
* Caller must hold bus->lock. */
int device_try_bind(device* dev, device_driver* drv);
int device_try_bind(device* dev, device_driver* drv)
{
bus_type* bus = dev->bus;
if (bus->match != nullptr && bus->match(dev, drv) == 0) {
return 0;
}
dev->driver = drv;
int rc = 0;
if (bus->probe != nullptr) {
rc = bus->probe(dev);
} else if (drv->probe != nullptr) {
rc = drv->probe(dev);
}
if (rc == 0) {
list_add_tail(&dev->driver_list, &drv->devices);
return 1;
}
dev->driver = nullptr;
return 0;
}
int device_register(device* dev)
{
if (dev == nullptr || dev->bus == nullptr) {
return -EINVAL;
}
if (!dev->bus->registered) {
kprintf("[device] register '%s' fail: bus '%s' not registered\n",
dev_name(dev),
dev->bus->name != nullptr ? dev->bus->name : "?");
return -ENODEV;
}
/* device_initialize is idempotent — safe to call again, but most
* paths will already have initialized. Detect via ktype set. */
if (dev->kobj.ktype == nullptr) {
device_initialize(dev);
}
if (dev->kobj.name == nullptr) {
kobject_add(&dev->kobj, nullptr, dev->init_name);
}
dev->bus_list.init();
dev->driver_list.init();
LockGuard g(dev->bus->lock);
list_add_tail(&dev->bus_list, &dev->bus->devices);
list_node* cur = dev->bus->drivers.next;
while (cur != &dev->bus->drivers) {
device_driver* drv =
list_entry<device_driver, &device_driver::bus_node>(cur);
cur = cur->next;
if (device_try_bind(dev, drv) != 0) {
break;
}
}
return 0;
}
void device_unregister(device* dev)
{
if (dev == nullptr || dev->bus == nullptr) {
return;
}
LockGuard g(dev->bus->lock);
if (dev->driver != nullptr) {
if (dev->driver->remove != nullptr) {
dev->driver->remove(dev);
}
list_del_init(&dev->driver_list);
dev->driver = nullptr;
}
list_del_init(&dev->bus_list);
}
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