net/caif/cfdbgl.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/stddef.h>
  10 #include <linux/slab.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 cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt);
  18 static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt);
  19
  20 struct cflayer *cfdbgl_create(u8 channel_id, struct dev_info *dev_info)
  21 {
  22         struct cfsrvl *dbg = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
  23         if (!dbg)
  24                 return NULL;
  25         caif_assert(offsetof(struct cfsrvl, layer) == 0);
  26         cfsrvl_init(dbg, channel_id, dev_info, false);
  27         dbg->layer.receive = cfdbgl_receive;
  28         dbg->layer.transmit = cfdbgl_transmit;
  29         snprintf(dbg->layer.name, CAIF_LAYER_NAME_SZ - 1, "dbg%d", channel_id);
  30         return &dbg->layer;
  31 }
  32
  33 static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt)
  34 {
  35         return layr->up->receive(layr->up, pkt);
  36 }
  37
  38 static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt)
  39 {
  40         struct cfsrvl *service = container_obj(layr);
  41         struct caif_payload_info *info;
  42         int ret;
  43
  44         if (!cfsrvl_ready(service, &ret)) {
  45                 cfpkt_destroy(pkt);
  46                 return ret;
  47         }
  48
  49         /* Add info for MUX-layer to route the packet out */
  50         info = cfpkt_info(pkt);
  51         info->channel_id = service->layer.id;
  52         info->dev_info = &service->dev_info;
  53
  54         return layr->dn->transmit(layr->dn, pkt);
  55 }