1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) ST-Ericsson AB 2010
4 * Author: Sjur Brendeland
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(size: sizeof(struct cfsrvl), GFP_ATOMIC);
25 if (!vid)
26 return NULL;
27 caif_assert(offsetof(struct cfsrvl, layer) == 0);
28
29 cfsrvl_init(service: vid, channel_id, dev_info, supports_flowctrl: false);
30 vid->layer.receive = cfvidl_receive;
31 vid->layer.transmit = cfvidl_transmit;
32 snprintf(buf: vid->layer.name, CAIF_LAYER_NAME_SZ, fmt: "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, data: &videoheader, len: 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, err: &ret)) {
55 cfpkt_destroy(pkt);
56 return ret;
57 }
58
59 cfpkt_add_head(pkt, data: &videoheader, len: 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

source code of linux/net/caif/cfvidl.c