net/caif/cfvidl.c

   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
  19 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
  20 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
  21
  22 struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
  23 {
  24         struct cfsrvl *vid = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
  25         if (!vid)
  26                 return NULL;
  27         caif_assert(offsetof(struct cfsrvl, layer) == 0);
  28
  29         cfsrvl_init(vid, channel_id, dev_info, false);
  30         vid->layer.receive = cfvidl_receive;
  31         vid->layer.transmit = cfvidl_transmit;
  32         snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1");
  33         return &vid->layer;
  34 }
  35
  36 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
  37 {
  38         u32 videoheader;
  39         if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
  40                 pr_err("Packet is erroneous!\n");
  41                 cfpkt_destroy(pkt);
  42                 return -EPROTO;
  43         }
  44         return layr->up->receive(layr->up, pkt);
  45 }
  46
  47 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
  48 {
  49         struct cfsrvl *service = container_obj(layr);
  50         struct caif_payload_info *info;
  51         u32 videoheader = 0;
  52         int ret;
  53
  54         if (!cfsrvl_ready(service, &ret)) {
  55                 cfpkt_destroy(pkt);
  56                 return ret;
  57         }
  58
  59         cfpkt_add_head(pkt, &videoheader, 4);
  60         /* Add info for MUX-layer to route the packet out */
  61         info = cfpkt_info(pkt);
  62         info->channel_id = service->layer.id;
  63         info->dev_info = &service->dev_info;
  64         return layr->dn->transmit(layr->dn, pkt);
  65 }