net/caif/cfvidl.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) ST-Ericsson AB 2010
0004  * Author:  Sjur Brendeland
0005  */
0006
0007 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
0008
0009 #include <linux/kernel.h>
0010 #include <linux/types.h>
0011 #include <linux/slab.h>
0012 #include <linux/errno.h>
0013 #include <net/caif/caif_layer.h>
0014 #include <net/caif/cfsrvl.h>
0015 #include <net/caif/cfpkt.h>
0016
0017 #define container_obj(layr) ((struct cfsrvl *) layr)
0018
0019 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
0020 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
0021
0022 struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
0023 {
0024     struct cfsrvl *vid = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
0025     if (!vid)
0026         return NULL;
0027     caif_assert(offsetof(struct cfsrvl, layer) == 0);
0028
0029     cfsrvl_init(vid, channel_id, dev_info, false);
0030     vid->layer.receive = cfvidl_receive;
0031     vid->layer.transmit = cfvidl_transmit;
0032     snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ, "vid1");
0033     return &vid->layer;
0034 }
0035
0036 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
0037 {
0038     u32 videoheader;
0039     if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
0040         pr_err("Packet is erroneous!\n");
0041         cfpkt_destroy(pkt);
0042         return -EPROTO;
0043     }
0044     return layr->up->receive(layr->up, pkt);
0045 }
0046
0047 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
0048 {
0049     struct cfsrvl *service = container_obj(layr);
0050     struct caif_payload_info *info;
0051     u32 videoheader = 0;
0052     int ret;
0053
0054     if (!cfsrvl_ready(service, &ret)) {
0055         cfpkt_destroy(pkt);
0056         return ret;
0057     }
0058
0059     cfpkt_add_head(pkt, &videoheader, 4);
0060     /* Add info for MUX-layer to route the packet out */
0061     info = cfpkt_info(pkt);
0062     info->channel_id = service->layer.id;
0063     info->dev_info = &service->dev_info;
0064     return layr->dn->transmit(layr->dn, pkt);
0065 }