xref: /openbmc/linux/net/caif/cfvidl.c (revision b830f94f)
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 
19 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
20 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
21 
22 struct 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, "vid1");
33 	return &vid->layer;
34 }
35 
36 static 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 
47 static 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