4dd820c088
If CAIF Link Layer returns an error, we no longer try to re-build the CAIF packet and resend it. Instead, we simply return any transmission errors to the socket client. Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
101 lines
2.6 KiB
C
101 lines
2.6 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/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 = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
|
|
if (!vei) {
|
|
pr_warn("Out of memory\n");
|
|
return NULL;
|
|
}
|
|
caif_assert(offsetof(struct cfsrvl, layer) == 0);
|
|
memset(vei, 0, sizeof(struct cfsrvl));
|
|
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))
|
|
return ret;
|
|
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");
|
|
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;
|
|
return layr->dn->transmit(layr->dn, pkt);
|
|
}
|