// SPDX-License-Identifier: GPL-2.0

#include <linux/proc_fs.h>

#include "fb_internal.h"

static struct proc_dir_entry *fb_proc_dir_entry;

static void *fb_seq_start(struct seq_file *m, loff_t *pos)
{
        mutex_lock(&registration_lock);

        return (*pos < FB_MAX) ? pos : NULL;
}

static void fb_seq_stop(struct seq_file *m, void *v)
{
        mutex_unlock(&registration_lock);
}

static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
        (*pos)++;

        return (*pos < FB_MAX) ? pos : NULL;
}

static int fb_seq_show(struct seq_file *m, void *v)
{
        int i = *(loff_t *)v;
        struct fb_info *fi = registered_fb[i];

        if (fi)
                seq_printf(m, "%d %s\n", fi->node, fi->fix.id);

        return 0;
}

static const struct seq_operations __maybe_unused fb_proc_seq_ops = {
        .start  = fb_seq_start,
        .stop   = fb_seq_stop,
        .next   = fb_seq_next,
        .show   = fb_seq_show,
};

int fb_init_procfs(void)
{
        struct proc_dir_entry *proc;

        proc = proc_create_seq("fb", 0, NULL, &fb_proc_seq_ops);
        if (!proc)
                return -ENOMEM;

        fb_proc_dir_entry = proc;

        return 0;
}

void fb_cleanup_procfs(void)
{
        proc_remove(fb_proc_dir_entry);
}