/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * daedalus-v4l2 — chardev bridge interface (kernel-internal).
 */
#ifndef DAEDALUS_V4L2_CHARDEV_H
#define DAEDALUS_V4L2_CHARDEV_H

#include <linux/types.h>

int daedalus_chardev_init(void);
void daedalus_chardev_exit(void);

/**
 * daedalus_chardev_enqueue_req() - queue a request for the daemon
 * @type:	request type (must have high bit clear; see enum
 *		daedalus_msg_type in include/daedalus_v4l2_proto.h)
 * @cookie:	caller-supplied identifier; echoed in matching response
 * @payload:	pointer to payload bytes (may be NULL if @payload_len = 0)
 * @payload_len: payload size in bytes (0..DAEDALUS_PROTO_MAX_PAYLOAD)
 *
 * Return: 0 on success, -ENODEV if chardev not registered,
 * -ENOSPC if the queue is full, -EMSGSIZE if @payload_len is
 * too large, -EINVAL if @type has the response bit set,
 * -ENOMEM on allocation failure.
 */
int daedalus_chardev_enqueue_req(__u32 type, __u32 cookie,
				 const void *payload, size_t payload_len);

#endif /* DAEDALUS_V4L2_CHARDEV_H */