From b482cd2053e3b90a7b33a78c63cdb6badf2ec383 Mon Sep 17 00:00:00 2001 From: Sjur Braendeland Date: Tue, 30 Mar 2010 13:56:23 +0000 Subject: 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 Signed-off-by: David S. Miller --- net/caif/cfveil.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 net/caif/cfveil.c (limited to 'net/caif/cfveil.c') diff --git a/net/caif/cfveil.c b/net/caif/cfveil.c new file mode 100644 index 0000000..0fd827f --- /dev/null +++ b/net/caif/cfveil.c @@ -0,0 +1,107 @@ +/* + * Copyright (C) ST-Ericsson AB 2010 + * Author: Sjur Brendeland/sjur.brandeland@stericsson.com + * License terms: GNU General Public License (GPL) version 2 + */ + +#include +#include +#include +#include +#include + +#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 VEI_CTRL_PKT_SIZE 1 +#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 = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); + if (!vei) { + pr_warning("CAIF: %s(): Out of memory\n", __func__); + return NULL; + } + caif_assert(offsetof(struct cfsrvl, layer) == 0); + memset(vei, 0, sizeof(struct cfsrvl)); + cfsrvl_init(vei, channel_id, dev_info); + 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("CAIF: %s(): Packet is erroneous!\n", __func__); + 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_warning("CAIF: %s():Unknown VEI control packet %d (0x%x)!\n", + __func__, 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)) + return ret; + caif_assert(layr->dn != NULL); + caif_assert(layr->dn->transmit != NULL); + if (!cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) { + pr_warning("CAIF: %s(): Packet too large - size=%d\n", + __func__, cfpkt_getlen(pkt)); + return -EOVERFLOW; + } + + if (cfpkt_add_head(pkt, &tmp, 1) < 0) { + pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); + return -EPROTO; + } + + /* 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; + ret = layr->dn->transmit(layr->dn, pkt); + if (ret < 0) + cfpkt_extr_head(pkt, &tmp, 1); + return ret; +} -- cgit v1.1