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>
diff --git a/net/caif/cfdgml.c b/net/caif/cfdgml.c
new file mode 100644
index 0000000..5319484
--- /dev/null
+++ b/net/caif/cfdgml.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/stddef.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <net/caif/caif_layer.h>
+#include <net/caif/cfsrvl.h>
+#include <net/caif/cfpkt.h>
+
+#define container_obj(layr) ((struct cfsrvl *) layr)
+
+#define DGM_CMD_BIT 0x80
+#define DGM_FLOW_OFF 0x81
+#define DGM_FLOW_ON 0x80
+#define DGM_CTRL_PKT_SIZE 1
+
+static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
+static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
+
+struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
+{
+ struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
+ if (!dgm) {
+ pr_warning("CAIF: %s(): Out of memory\n", __func__);
+ return NULL;
+ }
+ caif_assert(offsetof(struct cfsrvl, layer) == 0);
+ memset(dgm, 0, sizeof(struct cfsrvl));
+ cfsrvl_init(dgm, channel_id, dev_info);
+ dgm->layer.receive = cfdgml_receive;
+ dgm->layer.transmit = cfdgml_transmit;
+ snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
+ dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
+ return &dgm->layer;
+}
+
+static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
+{
+ u8 cmd = -1;
+ u8 dgmhdr[3];
+ int ret;
+ caif_assert(layr->up != NULL);
+ caif_assert(layr->receive != NULL);
+ caif_assert(layr->ctrlcmd != NULL);
+
+ if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
+ pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
+ cfpkt_destroy(pkt);
+ return -EPROTO;
+ }
+
+ if ((cmd & DGM_CMD_BIT) == 0) {
+ if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
+ pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
+ cfpkt_destroy(pkt);
+ return -EPROTO;
+ }
+ ret = layr->up->receive(layr->up, pkt);
+ return ret;
+ }
+
+ switch (cmd) {
+ case DGM_FLOW_OFF: /* FLOW OFF */
+ layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
+ cfpkt_destroy(pkt);
+ return 0;
+ case DGM_FLOW_ON: /* FLOW ON */
+ layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
+ cfpkt_destroy(pkt);
+ return 0;
+ default:
+ cfpkt_destroy(pkt);
+ pr_info("CAIF: %s(): Unknown datagram control %d (0x%x)\n",
+ __func__, cmd, cmd);
+ return -EPROTO;
+ }
+}
+
+static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
+{
+ u32 zero = 0;
+ struct caif_payload_info *info;
+ struct cfsrvl *service = container_obj(layr);
+ int ret;
+ if (!cfsrvl_ready(service, &ret))
+ return ret;
+
+ cfpkt_add_head(pkt, &zero, 4);
+
+ /* Add info for MUX-layer to route the packet out. */
+ info = cfpkt_info(pkt);
+ info->channel_id = service->layer.id;
+ /* To optimize alignment, we add up the size of CAIF header
+ * before payload.
+ */
+ info->hdr_len = 4;
+ info->dev_info = &service->dev_info;
+ ret = layr->dn->transmit(layr->dn, pkt);
+ if (ret < 0) {
+ u32 tmp32;
+ cfpkt_extr_head(pkt, &tmp32, 4);
+ }
+ return ret;
+}