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 #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
  17 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
  18 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
  19
  20 struct 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, false);
  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
  37 static 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
  48 static 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 }