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/*
* uqmi -- tiny QMI support implementation
*
* Copyright (C) 2014-2015 Felix Fietkau <nbd@openwrt.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "qmi-message.h"
static uint8_t buf[QMI_BUFFER_LEN];
static unsigned int buf_ofs;
uint8_t *__qmi_get_buf(unsigned int *ofs)
{
*ofs = buf_ofs;
return buf;
}
void __qmi_alloc_reset(void)
{
buf_ofs = 0;
}
void *__qmi_alloc_static(unsigned int len)
{
void *ret;
if (buf_ofs + len > sizeof(buf)) {
fprintf(stderr, "ERROR: static buffer for message data too small\n");
abort();
}
ret = &buf[buf_ofs];
buf_ofs += len;
memset(ret, 0, len);
return ret;
}
char *__qmi_copy_string(void *data, unsigned int len)
{
char *res;
res = (char *) &buf[buf_ofs];
buf_ofs += len + 1;
memcpy(res, data, len);
res[len] = 0;
return res;
}
struct tlv *tlv_get_next(void **buf, unsigned int *buflen)
{
struct tlv *tlv = NULL;
unsigned int tlv_len;
if (*buflen < sizeof(*tlv))
return NULL;
tlv = *buf;
tlv_len = le16_to_cpu(tlv->len) + sizeof(*tlv);
if (tlv_len > *buflen)
return NULL;
*buflen -= tlv_len;
*buf += tlv_len;
return tlv;
}
static struct tlv *qmi_msg_next_tlv(struct qmi_msg *qm, int add)
{
int tlv_len;
void *tlv;
if (qm->qmux.service == QMI_SERVICE_CTL) {
tlv = qm->ctl.tlv;
tlv_len = le16_to_cpu(qm->ctl.tlv_len);
qm->ctl.tlv_len = cpu_to_le16(tlv_len + add);
} else {
tlv = qm->svc.tlv;
tlv_len = le16_to_cpu(qm->svc.tlv_len);
qm->svc.tlv_len = cpu_to_le16(tlv_len + add);
}
tlv += tlv_len;
return tlv;
}
void tlv_new(struct qmi_msg *qm, uint8_t type, uint16_t len, void *data)
{
struct tlv *tlv;
tlv = qmi_msg_next_tlv(qm, sizeof(*tlv) + len);
tlv->type = type;
tlv->len = cpu_to_le16(len);
memcpy(tlv->data, data, len);
}
void qmi_init_request_message(struct qmi_msg *qm, QmiService service)
{
memset(qm, 0, sizeof(*qm));
qm->marker = 1;
qm->qmux.service = service;
}
int qmi_complete_request_message(struct qmi_msg *qm)
{
void *tlv_end = qmi_msg_next_tlv(qm, 0);
void *msg_start = &qm->qmux;
qm->qmux.len = cpu_to_le16(tlv_end - msg_start);
return tlv_end - msg_start + 1;
}
int qmi_check_message_status(void *tlv_buf, unsigned int len)
{
struct tlv *tlv;
struct {
uint16_t status;
uint16_t code;
} __packed *status;
while ((tlv = tlv_get_next(&tlv_buf, &len)) != NULL) {
if (tlv->type != 2)
continue;
if (tlv_data_len(tlv) != sizeof(*status))
return QMI_ERROR_INVALID_DATA;
status = (void *) tlv->data;
if (!status->status)
return 0;
return le16_to_cpu(status->code);
}
return QMI_ERROR_NO_DATA;
}
void *qmi_msg_get_tlv_buf(struct qmi_msg *qm, int *tlv_len)
{
void *ptr;
int len;
if (qm->qmux.service == QMI_SERVICE_CTL) {
ptr = qm->ctl.tlv;
len = qm->ctl.tlv_len;
} else {
ptr = qm->svc.tlv;
len = qm->svc.tlv_len;
}
if (tlv_len)
*tlv_len = len;
return ptr;
}
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