1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) ST-Ericsson AB 2010
4*4882a593Smuzhiyun * Author: Sjur Brendeland
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/types.h>
11*4882a593Smuzhiyun #include <linux/slab.h>
12*4882a593Smuzhiyun #include <linux/errno.h>
13*4882a593Smuzhiyun #include <net/caif/caif_layer.h>
14*4882a593Smuzhiyun #include <net/caif/cfsrvl.h>
15*4882a593Smuzhiyun #include <net/caif/cfpkt.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #define container_obj(layr) ((struct cfsrvl *) layr)
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
20*4882a593Smuzhiyun static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
21*4882a593Smuzhiyun
cfvidl_create(u8 channel_id,struct dev_info * dev_info)22*4882a593Smuzhiyun struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun struct cfsrvl *vid = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
25*4882a593Smuzhiyun if (!vid)
26*4882a593Smuzhiyun return NULL;
27*4882a593Smuzhiyun caif_assert(offsetof(struct cfsrvl, layer) == 0);
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun cfsrvl_init(vid, channel_id, dev_info, false);
30*4882a593Smuzhiyun vid->layer.receive = cfvidl_receive;
31*4882a593Smuzhiyun vid->layer.transmit = cfvidl_transmit;
32*4882a593Smuzhiyun snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ, "vid1");
33*4882a593Smuzhiyun return &vid->layer;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
cfvidl_receive(struct cflayer * layr,struct cfpkt * pkt)36*4882a593Smuzhiyun static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun u32 videoheader;
39*4882a593Smuzhiyun if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
40*4882a593Smuzhiyun pr_err("Packet is erroneous!\n");
41*4882a593Smuzhiyun cfpkt_destroy(pkt);
42*4882a593Smuzhiyun return -EPROTO;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun return layr->up->receive(layr->up, pkt);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
cfvidl_transmit(struct cflayer * layr,struct cfpkt * pkt)47*4882a593Smuzhiyun static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun struct cfsrvl *service = container_obj(layr);
50*4882a593Smuzhiyun struct caif_payload_info *info;
51*4882a593Smuzhiyun u32 videoheader = 0;
52*4882a593Smuzhiyun int ret;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun if (!cfsrvl_ready(service, &ret)) {
55*4882a593Smuzhiyun cfpkt_destroy(pkt);
56*4882a593Smuzhiyun return ret;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun cfpkt_add_head(pkt, &videoheader, 4);
60*4882a593Smuzhiyun /* Add info for MUX-layer to route the packet out */
61*4882a593Smuzhiyun info = cfpkt_info(pkt);
62*4882a593Smuzhiyun info->channel_id = service->layer.id;
63*4882a593Smuzhiyun info->dev_info = &service->dev_info;
64*4882a593Smuzhiyun return layr->dn->transmit(layr->dn, pkt);
65*4882a593Smuzhiyun }
66