// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:      Sjur Brendeland
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>

#define container_obj(layr) ((struct cfsrvl *) layr)

static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);

struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
{
        struct cfsrvl *vid = kzalloc_obj(struct cfsrvl, GFP_ATOMIC);
        if (!vid)
                return NULL;
        caif_assert(offsetof(struct cfsrvl, layer) == 0);

        cfsrvl_init(vid, channel_id, dev_info, false);
        vid->layer.receive = cfvidl_receive;
        vid->layer.transmit = cfvidl_transmit;
        snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ, "vid1");
        return &vid->layer;
}

static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
{
        u32 videoheader;
        if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
                pr_err("Packet is erroneous!\n");
                cfpkt_destroy(pkt);
                return -EPROTO;
        }
        return layr->up->receive(layr->up, pkt);
}

static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
        struct cfsrvl *service = container_obj(layr);
        struct caif_payload_info *info;
        u32 videoheader = 0;
        int ret;

        if (!cfsrvl_ready(service, &ret)) {
                cfpkt_destroy(pkt);
                return ret;
        }

        cfpkt_add_head(pkt, &videoheader, 4);
        /* Add info for MUX-layer to route the packet out */
        info = cfpkt_info(pkt);
        info->channel_id = service->layer.id;
        info->dev_info = &service->dev_info;
        return layr->dn->transmit(layr->dn, pkt);
}