1 files changed, 115 insertions, 0 deletions

diff --git a/net/caif/cfutill.c b/net/caif/cfutill.c
new file mode 100644
index 000000000000..5fd2c9ea8b42
--- /dev/null
+++ b/net/caif/cfutill.c
@@ -0,0 +1,115 @@
+/*
+ * 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)
+#define UTIL_PAYLOAD  0x00
+#define UTIL_CMD_BIT  0x80
+#define UTIL_REMOTE_SHUTDOWN 0x82
+#define UTIL_FLOW_OFF 0x81
+#define UTIL_FLOW_ON  0x80
+#define UTIL_CTRL_PKT_SIZE 1
+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 = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
+        if (!util) {
+                pr_warning("CAIF: %s(): Out of memory\n", __func__);
+                return NULL;
+        }
+        caif_assert(offsetof(struct cfsrvl, layer) == 0);
+        memset(util, 0, sizeof(struct cfsrvl));
+        cfsrvl_init(util, channel_id, dev_info);
+        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("CAIF: %s(): Packet is erroneous!\n", __func__);
+                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("CAIF: %s(): REMOTE SHUTDOWN REQUEST RECEIVED\n",
+                        __func__);
+                layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
+                service->open = false;
+                cfpkt_destroy(pkt);
+                return 0;
+        default:
+                cfpkt_destroy(pkt);
+                pr_warning("CAIF: %s(): Unknown service control %d (0x%x)\n",
+                           __func__, 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))
+                return ret;
+
+        if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
+                pr_err("CAIF: %s(): packet too large size=%d\n",
+                        __func__, cfpkt_getlen(pkt));
+                return -EOVERFLOW;
+        }
+
+        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;
+        ret = layr->dn->transmit(layr->dn, pkt);
+        if (ret < 0) {
+                u32 tmp32;
+                cfpkt_extr_head(pkt, &tmp32, 4);
+        }
+        return ret;
+}