linux/net/caif/cfvidl.c
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   1/*
   2 * Copyright (C) ST-Ericsson AB 2010
   3 * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
   4 * License terms: GNU General Public License (GPL) version 2
   5 */
   6
   7#include <linux/kernel.h>
   8#include <linux/types.h>
   9#include <linux/slab.h>
  10#include <linux/errno.h>
  11#include <net/caif/caif_layer.h>
  12#include <net/caif/cfsrvl.h>
  13#include <net/caif/cfpkt.h>
  14
  15#define container_obj(layr) ((struct cfsrvl *) layr)
  16
  17static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
  18static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
  19
  20struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
  21{
  22        struct cfsrvl *vid = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
  23        if (!vid) {
  24                pr_warning("CAIF: %s(): Out of memory\n", __func__);
  25                return NULL;
  26        }
  27        caif_assert(offsetof(struct cfsrvl, layer) == 0);
  28
  29        memset(vid, 0, sizeof(struct cfsrvl));
  30        cfsrvl_init(vid, channel_id, dev_info);
  31        vid->layer.receive = cfvidl_receive;
  32        vid->layer.transmit = cfvidl_transmit;
  33        snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1");
  34        return &vid->layer;
  35}
  36
  37static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
  38{
  39        u32 videoheader;
  40        if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
  41                pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
  42                cfpkt_destroy(pkt);
  43                return -EPROTO;
  44        }
  45        return layr->up->receive(layr->up, pkt);
  46}
  47
  48static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
  49{
  50        struct cfsrvl *service = container_obj(layr);
  51        struct caif_payload_info *info;
  52        u32 videoheader = 0;
  53        int ret;
  54        if (!cfsrvl_ready(service, &ret))
  55                return ret;
  56        cfpkt_add_head(pkt, &videoheader, 4);
  57        /* Add info for MUX-layer to route the packet out */
  58        info = cfpkt_info(pkt);
  59        info->channel_id = service->layer.id;
  60        info->dev_info = &service->dev_info;
  61        ret = layr->dn->transmit(layr->dn, pkt);
  62        if (ret < 0)
  63                cfpkt_extr_head(pkt, &videoheader, 4);
  64        return ret;
  65}
  66