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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
   8
   9#include <linux/kernel.h>
  10#include <linux/types.h>
  11#include <linux/slab.h>
  12#include <linux/errno.h>
  13#include <net/caif/caif_layer.h>
  14#include <net/caif/cfsrvl.h>
  15#include <net/caif/cfpkt.h>
  16
  17#define container_obj(layr) ((struct cfsrvl *) layr)
  18
  19static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
  20static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
  21
  22struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
  23{
  24        struct cfsrvl *vid = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
  25        if (!vid) {
  26                pr_warn("Out of memory\n");
  27                return NULL;
  28        }
  29        caif_assert(offsetof(struct cfsrvl, layer) == 0);
  30
  31        memset(vid, 0, sizeof(struct cfsrvl));
  32        cfsrvl_init(vid, channel_id, dev_info, false);
  33        vid->layer.receive = cfvidl_receive;
  34        vid->layer.transmit = cfvidl_transmit;
  35        snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1");
  36        return &vid->layer;
  37}
  38
  39static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
  40{
  41        u32 videoheader;
  42        if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
  43                pr_err("Packet is erroneous!\n");
  44                cfpkt_destroy(pkt);
  45                return -EPROTO;
  46        }
  47        return layr->up->receive(layr->up, pkt);
  48}
  49
  50static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
  51{
  52        struct cfsrvl *service = container_obj(layr);
  53        struct caif_payload_info *info;
  54        u32 videoheader = 0;
  55        int ret;
  56        if (!cfsrvl_ready(service, &ret))
  57                return ret;
  58        cfpkt_add_head(pkt, &videoheader, 4);
  59        /* Add info for MUX-layer to route the packet out */
  60        info = cfpkt_info(pkt);
  61        info->channel_id = service->layer.id;
  62        info->dev_info = &service->dev_info;
  63        ret = layr->dn->transmit(layr->dn, pkt);
  64        if (ret < 0)
  65                cfpkt_extr_head(pkt, &videoheader, 4);
  66        return ret;
  67}
  68