102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/*
|
|
* Copyright (C) ST-Ericsson AB 2010
|
|
* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
|
|
* 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))
|
|
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);
|
|
}
|