caif: Bugfix - Increase default headroom size for control channel.
[linux-2.6.git] / 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 }