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
cfvidl_create(u8 channel_id,struct dev_info * dev_info)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
cfvidl_receive(struct cflayer * layr,struct cfpkt * pkt)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
cfvidl_transmit(struct cflayer * layr,struct cfpkt * pkt)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 }
68