linux/net/caif/cfvidl.c
Sjur Braendeland b482cd2053 net-caif: add CAIF core protocol stack
CAIF generic protocol implementation. This layer is
somewhat generic in order to be able to use and test it outside
the Linux Kernel.

cfctrl.c     - CAIF control protocol layer
cfdbgl.c     - CAIF debug protocol layer
cfdgml.c     - CAIF datagram protocol layer
cffrml.c     - CAIF framing protocol layer
cfmuxl.c     - CAIF mux protocol layer
cfrfml.c     - CAIF remote file manager protocol layer
cfserl.c     - CAIF serial (fragmentation) protocol layer
cfsrvl.c     - CAIF generic service layer functions
cfutill.c    - CAIF utility protocol layer
cfveil.c     - CAIF AT protocol layer
cfvidl.c     - CAIF video protocol layer

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-03-30 19:08:46 -07:00

65 lines
1.8 KiB
C

/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define container_obj(layr) ((struct cfsrvl *) layr)
static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt);
struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *vid = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!vid) {
pr_warning("CAIF: %s(): Out of memory\n", __func__);
return NULL;
}
caif_assert(offsetof(struct cfsrvl, layer) == 0);
memset(vid, 0, sizeof(struct cfsrvl));
cfsrvl_init(vid, channel_id, dev_info);
vid->layer.receive = cfvidl_receive;
vid->layer.transmit = cfvidl_transmit;
snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1");
return &vid->layer;
}
static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u32 videoheader;
if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
cfpkt_destroy(pkt);
return -EPROTO;
}
return layr->up->receive(layr->up, pkt);
}
static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
struct cfsrvl *service = container_obj(layr);
struct caif_payload_info *info;
u32 videoheader = 0;
int ret;
if (!cfsrvl_ready(service, &ret))
return ret;
cfpkt_add_head(pkt, &videoheader, 4);
/* Add info for MUX-layer to route the packet out */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
info->dev_info = &service->dev_info;
ret = layr->dn->transmit(layr->dn, pkt);
if (ret < 0)
cfpkt_extr_head(pkt, &videoheader, 4);
return ret;
}