Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/caif/cfveil.c b/kernel/net/caif/cfveil.c
new file mode 100644 (file)
index 0000000..2622245
--- /dev/null
+++ b/kernel/net/caif/cfveil.c
@@ -0,0 +1,101 @@
+/*
+ * 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/stddef.h>
+#include <linux/slab.h>
+#include <net/caif/caif_layer.h>
+#include <net/caif/cfsrvl.h>
+#include <net/caif/cfpkt.h>
+
+#define VEI_PAYLOAD  0x00
+#define VEI_CMD_BIT  0x80
+#define VEI_FLOW_OFF 0x81
+#define VEI_FLOW_ON  0x80
+#define VEI_SET_PIN  0x82
+
+#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
+
+static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt);
+static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt);
+
+struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info)
+{
+       struct cfsrvl *vei = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
+       if (!vei)
+               return NULL;
+       caif_assert(offsetof(struct cfsrvl, layer) == 0);
+       cfsrvl_init(vei, channel_id, dev_info, true);
+       vei->layer.receive = cfvei_receive;
+       vei->layer.transmit = cfvei_transmit;
+       snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ - 1, "vei%d", channel_id);
+       return &vei->layer;
+}
+
+static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt)
+{
+       u8 cmd;
+       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("Packet is erroneous!\n");
+               cfpkt_destroy(pkt);
+               return -EPROTO;
+       }
+       switch (cmd) {
+       case VEI_PAYLOAD:
+               ret = layr->up->receive(layr->up, pkt);
+               return ret;
+       case VEI_FLOW_OFF:
+               layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
+               cfpkt_destroy(pkt);
+               return 0;
+       case VEI_FLOW_ON:
+               layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
+               cfpkt_destroy(pkt);
+               return 0;
+       case VEI_SET_PIN:       /* SET RS232 PIN */
+               cfpkt_destroy(pkt);
+               return 0;
+       default:                /* SET RS232 PIN */
+               pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd);
+               cfpkt_destroy(pkt);
+               return -EPROTO;
+       }
+}
+
+static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
+{
+       u8 tmp = 0;
+       struct caif_payload_info *info;
+       int ret;
+       struct cfsrvl *service = container_obj(layr);
+       if (!cfsrvl_ready(service, &ret))
+               goto err;
+       caif_assert(layr->dn != NULL);
+       caif_assert(layr->dn->transmit != NULL);
+
+       if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
+               pr_err("Packet is erroneous!\n");
+               ret = -EPROTO;
+               goto err;
+       }
+
+       /* Add info-> for MUX-layer to route the packet out. */
+       info = cfpkt_info(pkt);
+       info->channel_id = service->layer.id;
+       info->hdr_len = 1;
+       info->dev_info = &service->dev_info;
+       return layr->dn->transmit(layr->dn, pkt);
+err:
+       cfpkt_destroy(pkt);
+       return ret;
+}