cfveil.c
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/*
* 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;
}