/*
   * Copyright (C) ST-Ericsson AB 2010
   * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
   * 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!
  ");

  		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))
  		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);

  }