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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* chardev.cc — Character device registry
*
* Simple linked list of registered cdevs, searched by dev number.
*/
#include <lume/chardev.h>
#include <lume/list.h>
#include <lume/klog.h>
#include <kernel/sync/spinlock.h>
static list_node g_cdev_list;
static Spinlock g_cdev_lock;
void cdev_init()
{
list_init(&g_cdev_list);
}
void cdev_register(cdev* dev)
{
LockGuard guard(g_cdev_lock);
list_init(&dev->list);
list_add_tail(&dev->list, &g_cdev_list);
printk("[cdev] registered '%s' (%d,%d)\n",
dev->name, MAJOR(dev->dev), MINOR(dev->dev));
}
cdev* cdev_find(uint32 dev_nr)
{
LockGuard guard(g_cdev_lock);
list_node* pos;
for (pos = g_cdev_list.prev; pos != &g_cdev_list; pos = pos->prev) {
cdev* cd = container_of(pos, cdev, list);
if (cd->dev == dev_nr) {
return cd;
}
}
return nullptr;
}
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