538 lines
10 KiB
C
538 lines
10 KiB
C
/**
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* @file at.c
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* Generic AT command handling library implementation
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*/
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/*
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* Copyright (c) 2015-2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdarg.h>
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#include <net/buf.h>
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#include "at.h"
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static void next_list(struct at_client *at)
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{
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if (at->buf[at->pos] == ',') {
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at->pos++;
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}
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}
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int at_check_byte(struct net_buf *buf, char check_byte)
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{
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const unsigned char *str = buf->data;
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if (*str != check_byte) {
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return -EINVAL;
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}
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net_buf_pull(buf, 1);
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return 0;
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}
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static void skip_space(struct at_client *at)
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{
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while (at->buf[at->pos] == ' ') {
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at->pos++;
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}
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}
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int at_get_number(struct at_client *at, uint32_t *val)
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{
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uint32_t i;
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skip_space(at);
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for (i = 0U, *val = 0U;
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isdigit((unsigned char)at->buf[at->pos]);
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at->pos++, i++) {
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*val = *val * 10U + at->buf[at->pos] - '0';
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}
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if (i == 0U) {
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return -ENODATA;
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}
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next_list(at);
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return 0;
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}
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static bool str_has_prefix(const char *str, const char *prefix)
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{
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if (strncmp(str, prefix, strlen(prefix)) != 0) {
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return false;
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}
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return true;
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}
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static int at_parse_result(const char *str, struct net_buf *buf,
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enum at_result *result)
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{
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/* Map the result and check for end lf */
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if ((!strncmp(str, "OK", 2)) && (at_check_byte(buf, '\n') == 0)) {
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*result = AT_RESULT_OK;
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return 0;
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}
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if ((!strncmp(str, "ERROR", 5)) && (at_check_byte(buf, '\n')) == 0) {
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*result = AT_RESULT_ERROR;
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return 0;
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}
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return -ENOMSG;
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}
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static int get_cmd_value(struct at_client *at, struct net_buf *buf,
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char stop_byte, enum at_cmd_state cmd_state)
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{
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int cmd_len = 0;
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uint8_t pos = at->pos;
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const char *str = (char *)buf->data;
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while (cmd_len < buf->len && at->pos != at->buf_max_len) {
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if (*str != stop_byte) {
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at->buf[at->pos++] = *str;
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cmd_len++;
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str++;
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pos = at->pos;
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} else {
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cmd_len++;
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at->buf[at->pos] = '\0';
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at->pos = 0U;
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at->cmd_state = cmd_state;
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break;
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}
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}
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net_buf_pull(buf, cmd_len);
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if (pos == at->buf_max_len) {
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return -ENOBUFS;
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}
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return 0;
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}
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static int get_response_string(struct at_client *at, struct net_buf *buf,
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char stop_byte, enum at_state state)
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{
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int cmd_len = 0;
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uint8_t pos = at->pos;
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const char *str = (char *)buf->data;
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while (cmd_len < buf->len && at->pos != at->buf_max_len) {
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if (*str != stop_byte) {
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at->buf[at->pos++] = *str;
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cmd_len++;
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str++;
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pos = at->pos;
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} else {
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cmd_len++;
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at->buf[at->pos] = '\0';
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at->pos = 0U;
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at->state = state;
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break;
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}
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}
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net_buf_pull(buf, cmd_len);
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if (pos == at->buf_max_len) {
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return -ENOBUFS;
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}
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return 0;
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}
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static void reset_buffer(struct at_client *at)
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{
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(void)memset(at->buf, 0, at->buf_max_len);
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at->pos = 0U;
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}
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static int at_state_start(struct at_client *at, struct net_buf *buf)
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{
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int err;
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err = at_check_byte(buf, '\r');
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if (err < 0) {
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return err;
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}
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at->state = AT_STATE_START_CR;
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return 0;
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}
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static int at_state_start_cr(struct at_client *at, struct net_buf *buf)
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{
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int err;
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err = at_check_byte(buf, '\n');
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if (err < 0) {
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return err;
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}
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at->state = AT_STATE_START_LF;
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return 0;
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}
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static int at_state_start_lf(struct at_client *at, struct net_buf *buf)
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{
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reset_buffer(at);
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if (at_check_byte(buf, '+') == 0) {
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at->state = AT_STATE_GET_CMD_STRING;
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return 0;
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} else if (isalpha(*buf->data)) {
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at->state = AT_STATE_GET_RESULT_STRING;
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return 0;
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}
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return -ENODATA;
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}
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static int at_state_get_cmd_string(struct at_client *at, struct net_buf *buf)
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{
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return get_response_string(at, buf, ':', AT_STATE_PROCESS_CMD);
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}
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static bool is_cmer(struct at_client *at)
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{
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if (strncmp(at->buf, "CME ERROR", 9) == 0) {
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return true;
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}
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return false;
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}
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static int at_state_process_cmd(struct at_client *at, struct net_buf *buf)
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{
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if (is_cmer(at)) {
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at->state = AT_STATE_PROCESS_AG_NW_ERR;
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return 0;
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}
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if (at->resp) {
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at->resp(at, buf);
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at->resp = NULL;
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return 0;
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}
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at->state = AT_STATE_UNSOLICITED_CMD;
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return 0;
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}
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static int at_state_get_result_string(struct at_client *at, struct net_buf *buf)
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{
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return get_response_string(at, buf, '\r', AT_STATE_PROCESS_RESULT);
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}
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static bool is_ring(struct at_client *at)
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{
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if (strncmp(at->buf, "RING", 4) == 0) {
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return true;
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}
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return false;
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}
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static int at_state_process_result(struct at_client *at, struct net_buf *buf)
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{
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enum at_cme cme_err;
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enum at_result result;
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if (is_ring(at)) {
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at->state = AT_STATE_UNSOLICITED_CMD;
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return 0;
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}
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if (at_parse_result(at->buf, buf, &result) == 0) {
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if (at->finish) {
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/* cme_err is 0 - Is invalid until result is
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* AT_RESULT_CME_ERROR
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*/
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cme_err = 0;
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at->finish(at, result, cme_err);
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}
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}
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/* Reset the state to process unsolicited response */
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at->cmd_state = AT_CMD_START;
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at->state = AT_STATE_START;
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return 0;
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}
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int cme_handle(struct at_client *at)
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{
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enum at_cme cme_err;
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uint32_t val;
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if (!at_get_number(at, &val) && val <= CME_ERROR_NETWORK_NOT_ALLOWED) {
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cme_err = val;
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} else {
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cme_err = CME_ERROR_UNKNOWN;
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}
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if (at->finish) {
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at->finish(at, AT_RESULT_CME_ERROR, cme_err);
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}
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return 0;
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}
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static int at_state_process_ag_nw_err(struct at_client *at, struct net_buf *buf)
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{
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at->cmd_state = AT_CMD_GET_VALUE;
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return at_parse_cmd_input(at, buf, NULL, cme_handle,
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AT_CMD_TYPE_NORMAL);
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}
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static int at_state_unsolicited_cmd(struct at_client *at, struct net_buf *buf)
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{
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if (at->unsolicited) {
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return at->unsolicited(at, buf);
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}
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return -ENODATA;
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}
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/* The order of handler function should match the enum at_state */
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static handle_parse_input_t parser_cb[] = {
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at_state_start, /* AT_STATE_START */
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at_state_start_cr, /* AT_STATE_START_CR */
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at_state_start_lf, /* AT_STATE_START_LF */
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at_state_get_cmd_string, /* AT_STATE_GET_CMD_STRING */
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at_state_process_cmd, /* AT_STATE_PROCESS_CMD */
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at_state_get_result_string, /* AT_STATE_GET_RESULT_STRING */
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at_state_process_result, /* AT_STATE_PROCESS_RESULT */
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at_state_process_ag_nw_err, /* AT_STATE_PROCESS_AG_NW_ERR */
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at_state_unsolicited_cmd /* AT_STATE_UNSOLICITED_CMD */
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};
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int at_parse_input(struct at_client *at, struct net_buf *buf)
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{
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int ret;
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while (buf->len) {
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if (at->state < AT_STATE_START || at->state >= AT_STATE_END) {
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return -EINVAL;
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}
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ret = parser_cb[at->state](at, buf);
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if (ret < 0) {
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/* Reset the state in case of error */
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at->cmd_state = AT_CMD_START;
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at->state = AT_STATE_START;
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return ret;
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}
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}
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return 0;
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}
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static int at_cmd_start(struct at_client *at, struct net_buf *buf,
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const char *prefix, parse_val_t func,
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enum at_cmd_type type)
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{
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if (!str_has_prefix(at->buf, prefix)) {
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if (type == AT_CMD_TYPE_NORMAL) {
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at->state = AT_STATE_UNSOLICITED_CMD;
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}
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return -ENODATA;
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}
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if (type == AT_CMD_TYPE_OTHER) {
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/* Skip for Other type such as ..RING.. which does not have
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* values to get processed.
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*/
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at->cmd_state = AT_CMD_PROCESS_VALUE;
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} else {
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at->cmd_state = AT_CMD_GET_VALUE;
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}
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return 0;
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}
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static int at_cmd_get_value(struct at_client *at, struct net_buf *buf,
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const char *prefix, parse_val_t func,
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enum at_cmd_type type)
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{
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/* Reset buffer before getting the values */
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reset_buffer(at);
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return get_cmd_value(at, buf, '\r', AT_CMD_PROCESS_VALUE);
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}
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static int at_cmd_process_value(struct at_client *at, struct net_buf *buf,
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const char *prefix, parse_val_t func,
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enum at_cmd_type type)
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{
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int ret;
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ret = func(at);
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at->cmd_state = AT_CMD_STATE_END_LF;
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return ret;
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}
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static int at_cmd_state_end_lf(struct at_client *at, struct net_buf *buf,
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const char *prefix, parse_val_t func,
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enum at_cmd_type type)
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{
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int err;
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err = at_check_byte(buf, '\n');
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if (err < 0) {
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return err;
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}
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at->cmd_state = AT_CMD_START;
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at->state = AT_STATE_START;
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return 0;
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}
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/* The order of handler function should match the enum at_cmd_state */
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static handle_cmd_input_t cmd_parser_cb[] = {
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at_cmd_start, /* AT_CMD_START */
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at_cmd_get_value, /* AT_CMD_GET_VALUE */
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at_cmd_process_value, /* AT_CMD_PROCESS_VALUE */
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at_cmd_state_end_lf /* AT_CMD_STATE_END_LF */
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};
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int at_parse_cmd_input(struct at_client *at, struct net_buf *buf,
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const char *prefix, parse_val_t func,
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enum at_cmd_type type)
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{
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int ret;
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while (buf->len) {
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if (at->cmd_state < AT_CMD_START ||
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at->cmd_state >= AT_CMD_STATE_END) {
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return -EINVAL;
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}
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ret = cmd_parser_cb[at->cmd_state](at, buf, prefix, func, type);
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if (ret < 0) {
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return ret;
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}
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/* Check for main state, the end of cmd parsing and return. */
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if (at->state == AT_STATE_START) {
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return 0;
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}
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}
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return 0;
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}
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int at_has_next_list(struct at_client *at)
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{
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return at->buf[at->pos] != '\0';
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}
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int at_open_list(struct at_client *at)
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{
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skip_space(at);
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/* The list shall start with '(' open parenthesis */
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if (at->buf[at->pos] != '(') {
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return -ENODATA;
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}
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at->pos++;
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return 0;
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}
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int at_close_list(struct at_client *at)
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{
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skip_space(at);
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if (at->buf[at->pos] != ')') {
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return -ENODATA;
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}
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at->pos++;
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next_list(at);
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return 0;
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}
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int at_list_get_string(struct at_client *at, char *name, uint8_t len)
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{
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int i = 0;
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skip_space(at);
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if (at->buf[at->pos] != '"') {
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return -ENODATA;
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}
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at->pos++;
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while (at->buf[at->pos] != '\0' && at->buf[at->pos] != '"') {
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if (i == len) {
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return -ENODATA;
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}
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name[i++] = at->buf[at->pos++];
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}
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if (i == len) {
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return -ENODATA;
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}
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name[i] = '\0';
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if (at->buf[at->pos] != '"') {
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return -ENODATA;
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}
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at->pos++;
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skip_space(at);
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next_list(at);
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return 0;
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}
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int at_list_get_range(struct at_client *at, uint32_t *min, uint32_t *max)
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{
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uint32_t low, high;
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int ret;
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ret = at_get_number(at, &low);
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if (ret < 0) {
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return ret;
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}
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if (at->buf[at->pos] == '-') {
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at->pos++;
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goto out;
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}
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if (!isdigit((unsigned char)at->buf[at->pos])) {
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return -ENODATA;
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}
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out:
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ret = at_get_number(at, &high);
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if (ret < 0) {
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return ret;
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}
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*min = low;
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*max = high;
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next_list(at);
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return 0;
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}
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void at_register_unsolicited(struct at_client *at, at_resp_cb_t unsolicited)
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{
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at->unsolicited = unsolicited;
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}
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void at_register(struct at_client *at, at_resp_cb_t resp, at_finish_cb_t finish)
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{
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at->resp = resp;
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at->finish = finish;
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at->state = AT_STATE_START;
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}
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