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authorSjur Braendeland <sjur.brandeland@stericsson.com>2010-03-30 13:56:23 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-30 19:08:46 -0700
commitb482cd2053e3b90a7b33a78c63cdb6badf2ec383 (patch)
tree1c05e28f19a194b52bf43730fa498dcdb0e92b59 /net/caif/cfvidl.c
parent2721c5b9dd2a56a9710021c00146bb26ba8dd7b3 (diff)
downloadlinux-b482cd2053e3b90a7b33a78c63cdb6badf2ec383.tar.bz2
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>
Diffstat (limited to 'net/caif/cfvidl.c')
-rw-r--r--net/caif/cfvidl.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/net/caif/cfvidl.c b/net/caif/cfvidl.c
new file mode 100644
index 000000000000..89ad4ea239f1
--- /dev/null
+++ b/net/caif/cfvidl.c
@@ -0,0 +1,65 @@
+/*
+ * 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;
+}