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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* test_driver_model — exercises kref, kobject, and the bus/device/driver
* core. Uses a dummy bus + dummy driver + dummy device so the test is
* self-contained and doesn't depend on FDT/platform_device.
*/
#include <lume/selftest.h>
#include <lume/kref.h>
#include <lume/kobject.h>
#include <lume/device.h>
#include <lume/irq.h>
/* ------------------------------------------------------------------ */
/* Test 1: kref get/put + release fires exactly once */
/* ------------------------------------------------------------------ */
namespace {
struct krefable {
kref ref;
int release_count;
};
void krefable_release(kref* r)
{
auto* k = container_of(r, krefable, ref);
k->release_count++;
}
void test_kref()
{
st_begin("kref: init/get/put");
krefable k = {};
kref_init(&k.ref);
ST_ASSERT_EQ(kref_read(&k.ref), 1);
kref_get(&k.ref);
kref_get(&k.ref);
ST_ASSERT_EQ(kref_read(&k.ref), 3);
ST_ASSERT_EQ(kref_put(&k.ref, krefable_release), 0);
ST_ASSERT_EQ(kref_put(&k.ref, krefable_release), 0);
ST_ASSERT_EQ(k.release_count, 0);
ST_ASSERT_EQ(kref_put(&k.ref, krefable_release), 1);
ST_ASSERT_EQ(k.release_count, 1);
st_pass();
}
/* ------------------------------------------------------------------ */
/* Test 2: kobject parent/child + release on final put */
/* ------------------------------------------------------------------ */
int g_child_released = 0;
int g_parent_released = 0;
void child_release(kobject*) { g_child_released++; }
void parent_release(kobject*) { g_parent_released++; }
const kobj_type child_ktype = { .release = child_release };
const kobj_type parent_ktype = { .release = parent_release };
void test_kobject_hierarchy()
{
st_begin("kobject: parent/child + ref counting");
g_child_released = 0;
g_parent_released = 0;
kobject parent;
kobject_init(&parent, &parent_ktype);
kobject child;
kobject_init(&child, &child_ktype);
kobject_add(&child, &parent, "child");
/* Adding child took a ref on parent. */
ST_ASSERT_EQ(kref_read(&parent.refcount), 2);
ST_ASSERT(child.parent == &parent);
/* Drop child's "added" reference — release should NOT fire because
* we (the test) still hold the original kobject_init ref. */
kobject_del(&child);
ST_ASSERT(child.parent == nullptr);
ST_ASSERT_EQ(kref_read(&parent.refcount), 1);
ST_ASSERT_EQ(g_child_released, 0);
ST_ASSERT_EQ(g_parent_released, 0);
/* Drop final refs. */
kobject_put(&child);
ST_ASSERT_EQ(g_child_released, 1);
kobject_put(&parent);
ST_ASSERT_EQ(g_parent_released, 1);
st_pass();
}
/* ------------------------------------------------------------------ */
/* Test 3: bus / device / driver bind via match + probe */
/* ------------------------------------------------------------------ */
struct dummy_dev { device dev; int probed; };
struct dummy_drv { device_driver drv; const char* want; };
int g_probes = 0;
int dummy_match(device* dev, device_driver* drv)
{
auto* dd = container_of(drv, dummy_drv, drv);
return (dev->init_name != nullptr &&
dd->want != nullptr &&
__builtin_strcmp(dev->init_name, dd->want) == 0) ? 1 : 0;
}
int dummy_probe(device* dev)
{
auto* dd = container_of(dev, dummy_dev, dev);
dd->probed++;
g_probes++;
return 0;
}
bus_type dummy_bus = {
.name = "test_dummy",
.match = dummy_match,
.probe = nullptr, /* fall through to drv->probe */
.devices = {},
.drivers = {},
.lock = {},
.registered = false,
};
void test_bus_bind()
{
st_begin("driver model: bus / driver / device bind");
g_probes = 0;
ST_ASSERT_EQ(bus_register(&dummy_bus), 0);
/* Register driver before any matching device exists. */
dummy_drv drv_a = {};
drv_a.drv.name = "drv_a";
drv_a.drv.bus = &dummy_bus;
drv_a.drv.probe = dummy_probe;
drv_a.want = "compat_a";
ST_ASSERT_EQ(driver_register(&drv_a.drv), 0);
/* Register a device that should bind to drv_a immediately. */
dummy_dev dev_a = {};
dev_a.dev.bus = &dummy_bus;
dev_a.dev.init_name = "compat_a";
ST_ASSERT_EQ(device_register(&dev_a.dev), 0);
ST_ASSERT_EQ(dev_a.probed, 1);
ST_ASSERT(dev_a.dev.driver == &drv_a.drv);
/* Register a device first, then a driver — should also bind. */
dummy_dev dev_b = {};
dev_b.dev.bus = &dummy_bus;
dev_b.dev.init_name = "compat_b";
ST_ASSERT_EQ(device_register(&dev_b.dev), 0);
ST_ASSERT_EQ(dev_b.probed, 0);
dummy_drv drv_b = {};
drv_b.drv.name = "drv_b";
drv_b.drv.bus = &dummy_bus;
drv_b.drv.probe = dummy_probe;
drv_b.want = "compat_b";
ST_ASSERT_EQ(driver_register(&drv_b.drv), 0);
ST_ASSERT_EQ(dev_b.probed, 1);
ST_ASSERT(dev_b.dev.driver == &drv_b.drv);
/* Non-matching device sits unbound. */
dummy_dev dev_c = {};
dev_c.dev.bus = &dummy_bus;
dev_c.dev.init_name = "compat_unknown";
ST_ASSERT_EQ(device_register(&dev_c.dev), 0);
ST_ASSERT_EQ(dev_c.probed, 0);
ST_ASSERT(dev_c.dev.driver == nullptr);
ST_ASSERT_EQ(g_probes, 2);
/* Cleanup. */
device_unregister(&dev_a.dev);
device_unregister(&dev_b.dev);
device_unregister(&dev_c.dev);
driver_unregister(&drv_a.drv);
driver_unregister(&drv_b.drv);
st_pass();
}
} // namespace
/* ------------------------------------------------------------------ */
/* Entry */
/* ------------------------------------------------------------------ */
void selftest_driver_model()
{
test_kref();
test_kobject_hierarchy();
test_bus_bind();
st_begin("driver model: platform IRQ chip probed");
ST_ASSERT(g_irq_manager.get_chip() != nullptr);
st_pass();
}
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