1/*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author:	Sjur Brendeland
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
19static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
20static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
21
22struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
23{
24	struct cfsrvl *vid = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
25	if (!vid)
26		return NULL;
27	caif_assert(offsetof(struct cfsrvl, layer) == 0);
28
29	cfsrvl_init(vid, channel_id, dev_info, false);
30	vid->layer.receive = cfvidl_receive;
31	vid->layer.transmit = cfvidl_transmit;
32	snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1");
33	return &vid->layer;
34}
35
36static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
37{
38	u32 videoheader;
39	if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
40		pr_err("Packet is erroneous!\n");
41		cfpkt_destroy(pkt);
42		return -EPROTO;
43	}
44	return layr->up->receive(layr->up, pkt);
45}
46
47static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
48{
49	struct cfsrvl *service = container_obj(layr);
50	struct caif_payload_info *info;
51	u32 videoheader = 0;
52	int ret;
53
54	if (!cfsrvl_ready(service, &ret)) {
55		cfpkt_destroy(pkt);
56		return ret;
57	}
58
59	cfpkt_add_head(pkt, &videoheader, 4);
60	/* Add info for MUX-layer to route the packet out */
61	info = cfpkt_info(pkt);
62	info->channel_id = service->layer.id;
63	info->dev_info = &service->dev_info;
64	return layr->dn->transmit(layr->dn, pkt);
65}
66