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 = 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
  39 static 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
  50 static 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 }