cfvidl.c

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/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:  Sjur Brendeland/[email protected]
 * License terms: GNU General Public License (GPL) version 2
 */

#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(sizeof(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 - 1, "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);
}