Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / caif / cfutill.c

diff --git a/kernel/net/caif/cfutill.c b/kernel/net/caif/cfutill.c
new file mode 100644 (file)
index 0000000..1728fa4
--- /dev/null
+++ b/kernel/net/caif/cfutill.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) ST-Ericsson AB 2010
+ * Author:     Sjur Brendeland
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
+
+#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)
+#define UTIL_PAYLOAD  0x00
+#define UTIL_CMD_BIT  0x80
+#define UTIL_REMOTE_SHUTDOWN 0x82
+#define UTIL_FLOW_OFF 0x81
+#define UTIL_FLOW_ON  0x80
+
+static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt);
+static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt);
+
+struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info)
+{
+       struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
+       if (!util)
+               return NULL;
+       caif_assert(offsetof(struct cfsrvl, layer) == 0);
+       cfsrvl_init(util, channel_id, dev_info, true);
+       util->layer.receive = cfutill_receive;
+       util->layer.transmit = cfutill_transmit;
+       snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1");
+       return &util->layer;
+}
+
+static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt)
+{
+       u8 cmd = -1;
+       struct cfsrvl *service = container_obj(layr);
+       caif_assert(layr != NULL);
+       caif_assert(layr->up != NULL);
+       caif_assert(layr->up->receive != NULL);
+       caif_assert(layr->up->ctrlcmd != NULL);
+       if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
+               pr_err("Packet is erroneous!\n");
+               cfpkt_destroy(pkt);
+               return -EPROTO;
+       }
+
+       switch (cmd) {
+       case UTIL_PAYLOAD:
+               return layr->up->receive(layr->up, pkt);
+       case UTIL_FLOW_OFF:
+               layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
+               cfpkt_destroy(pkt);
+               return 0;
+       case UTIL_FLOW_ON:
+               layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
+               cfpkt_destroy(pkt);
+               return 0;
+       case UTIL_REMOTE_SHUTDOWN:      /* Remote Shutdown Request */
+               pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n");
+               layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
+               service->open = false;
+               cfpkt_destroy(pkt);
+               return 0;
+       default:
+               cfpkt_destroy(pkt);
+               pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd);
+               return -EPROTO;
+       }
+}
+
+static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt)
+{
+       u8 zero = 0;
+       struct caif_payload_info *info;
+       int ret;
+       struct cfsrvl *service = container_obj(layr);
+       caif_assert(layr != NULL);
+       caif_assert(layr->dn != NULL);
+       caif_assert(layr->dn->transmit != NULL);
+
+       if (!cfsrvl_ready(service, &ret)) {
+               cfpkt_destroy(pkt);
+               return ret;
+       }
+
+       cfpkt_add_head(pkt, &zero, 1);
+       /* 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 = 1;
+       info->dev_info = &service->dev_info;
+       return layr->dn->transmit(layr->dn, pkt);
+}