Merge tag 'arm-drivers-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[linux-2.6-microblaze.git] / net / caif / cfvidl.c
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 }