368 lines
10 KiB
C
368 lines
10 KiB
C
/** @file
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* @brief Modem command handler header file.
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*
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* Text-based command handler implementation for modem context driver.
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*/
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/*
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* Copyright (c) 2019 Foundries.io
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_DRIVERS_MODEM_MODEM_CMD_HANDLER_H_
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#define ZEPHYR_INCLUDE_DRIVERS_MODEM_MODEM_CMD_HANDLER_H_
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#include <zephyr/kernel.h>
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#include "modem_context.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MODEM_CMD_DEFINE(name_) \
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static int name_(struct modem_cmd_handler_data *data, uint16_t len, \
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uint8_t **argv, uint16_t argc)
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#define MODEM_CMD(cmd_, func_cb_, acount_, adelim_) { \
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.cmd = cmd_, \
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.cmd_len = (uint16_t)sizeof(cmd_)-1, \
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.func = func_cb_, \
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.arg_count_min = acount_, \
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.arg_count_max = acount_, \
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.delim = adelim_, \
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.direct = false, \
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}
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#define MODEM_CMD_ARGS_MAX(cmd_, func_cb_, acount_, acountmax_, adelim_) { \
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.cmd = cmd_, \
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.cmd_len = (uint16_t)sizeof(cmd_)-1, \
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.func = func_cb_, \
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.arg_count_min = acount_, \
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.arg_count_max = acountmax_, \
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.delim = adelim_, \
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.direct = false, \
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}
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#define MODEM_CMD_DIRECT_DEFINE(name_) MODEM_CMD_DEFINE(name_)
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#define MODEM_CMD_DIRECT(cmd_, func_cb_) { \
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.cmd = cmd_, \
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.cmd_len = (uint16_t)sizeof(cmd_)-1, \
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.func = func_cb_, \
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.arg_count_min = 0, \
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.arg_count_max = 0, \
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.delim = "", \
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.direct = true, \
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}
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#define CMD_RESP 0
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#define CMD_UNSOL 1
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#define CMD_HANDLER 2
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#define CMD_MAX 3
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/*
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* Flags for modem_send_cmd_ext.
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*/
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#define MODEM_NO_TX_LOCK BIT(0)
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#define MODEM_NO_SET_CMDS BIT(1)
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#define MODEM_NO_UNSET_CMDS BIT(2)
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struct modem_cmd_handler_data;
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struct modem_cmd {
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int (*func)(struct modem_cmd_handler_data *data, uint16_t len,
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uint8_t **argv, uint16_t argc);
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const char *cmd;
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const char *delim;
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uint16_t cmd_len;
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uint16_t arg_count_min;
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uint16_t arg_count_max;
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bool direct;
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};
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#define SETUP_CMD(cmd_send_, match_cmd_, func_cb_, num_param_, delim_) { \
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.send_cmd = cmd_send_, \
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MODEM_CMD(match_cmd_, func_cb_, num_param_, delim_) \
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}
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#define SETUP_CMD_NOHANDLE(send_cmd_) \
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SETUP_CMD(send_cmd_, NULL, NULL, 0U, NULL)
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/* series of modem setup commands to run */
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struct setup_cmd {
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const char *send_cmd;
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struct modem_cmd handle_cmd;
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};
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struct modem_cmd_handler_data {
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const struct modem_cmd *cmds[CMD_MAX];
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size_t cmds_len[CMD_MAX];
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char *match_buf;
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size_t match_buf_len;
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int last_error;
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const char *eol;
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size_t eol_len;
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/* rx net buffer */
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struct net_buf *rx_buf;
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/* allocation info */
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struct net_buf_pool *buf_pool;
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k_timeout_t alloc_timeout;
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/* locks */
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struct k_sem sem_tx_lock;
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struct k_sem sem_parse_lock;
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/* user data */
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void *user_data;
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};
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/**
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* @brief get the last error code
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*
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* @param *data: command handler data reference
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*
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* @retval last handled error.
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*/
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int modem_cmd_handler_get_error(struct modem_cmd_handler_data *data);
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/**
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* @brief set the last error code
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*
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* @param *data: command handler data reference
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* @param *error_code: error
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*
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* @retval 0 if ok, < 0 if error.
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*/
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int modem_cmd_handler_set_error(struct modem_cmd_handler_data *data,
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int error_code);
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/**
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* @brief update the parser's handler commands
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*
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* @param *data: handler data to use
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* @param *handler_cmds: commands to attach
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* @param handler_cmds_len: size of commands array
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* @param reset_error_flag: reset last error code
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*
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* @retval 0 if ok, < 0 if error.
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*/
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int modem_cmd_handler_update_cmds(struct modem_cmd_handler_data *data,
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const struct modem_cmd *handler_cmds,
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size_t handler_cmds_len,
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bool reset_error_flag);
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/**
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* @brief send AT command to interface with behavior defined by flags
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*
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* This function is similar to @ref modem_cmd_send, but it allows to choose a
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* specific behavior regarding acquiring tx_lock, setting and unsetting
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* @a handler_cmds.
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*
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* @param *iface: interface to use
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* @param *handler: command handler to use
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* @param *handler_cmds: commands to attach
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* @param handler_cmds_len: size of commands array
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* @param *buf: NULL terminated send buffer
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* @param *sem: wait for response semaphore
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* @param timeout: timeout of command
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* @param flags: flags which influence behavior of command sending
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*
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* @retval 0 if ok, < 0 if error.
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*/
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int modem_cmd_send_ext(struct modem_iface *iface,
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struct modem_cmd_handler *handler,
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const struct modem_cmd *handler_cmds,
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size_t handler_cmds_len, const uint8_t *buf,
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struct k_sem *sem, k_timeout_t timeout, int flags);
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/**
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* @brief send AT command to interface w/o locking TX
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*
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* @param *iface: interface to use
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* @param *handler: command handler to use
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* @param *handler_cmds: commands to attach
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* @param handler_cmds_len: size of commands array
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* @param *buf: NULL terminated send buffer
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* @param *sem: wait for response semaphore
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* @param timeout: timeout of command
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*
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* @retval 0 if ok, < 0 if error.
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*/
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static inline int modem_cmd_send_nolock(struct modem_iface *iface,
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struct modem_cmd_handler *handler,
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const struct modem_cmd *handler_cmds,
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size_t handler_cmds_len,
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const uint8_t *buf, struct k_sem *sem,
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k_timeout_t timeout)
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{
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return modem_cmd_send_ext(iface, handler, handler_cmds,
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handler_cmds_len, buf, sem, timeout,
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MODEM_NO_TX_LOCK);
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}
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/**
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* @brief send AT command to interface w/ a TX lock
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*
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* @param *iface: interface to use
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* @param *handler: command handler to use
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* @param *handler_cmds: commands to attach
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* @param handler_cmds_len: size of commands array
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* @param *buf: NULL terminated send buffer
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* @param *sem: wait for response semaphore
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* @param timeout: timeout of command
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*
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* @retval 0 if ok, < 0 if error.
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*/
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static inline int modem_cmd_send(struct modem_iface *iface,
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struct modem_cmd_handler *handler,
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const struct modem_cmd *handler_cmds,
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size_t handler_cmds_len, const uint8_t *buf,
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struct k_sem *sem, k_timeout_t timeout)
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{
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return modem_cmd_send_ext(iface, handler, handler_cmds,
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handler_cmds_len, buf, sem, timeout, 0);
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}
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/**
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* @brief send a series of AT commands w/ a TX lock
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*
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* @param *iface: interface to use
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* @param *handler: command handler to use
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* @param *cmds: array of setup commands to send
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* @param cmds_len: size of the setup command array
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* @param *sem: wait for response semaphore
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* @param timeout: timeout of command
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*
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* @retval 0 if ok, < 0 if error.
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*/
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int modem_cmd_handler_setup_cmds(struct modem_iface *iface,
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struct modem_cmd_handler *handler,
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const struct setup_cmd *cmds, size_t cmds_len,
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struct k_sem *sem, k_timeout_t timeout);
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/**
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* @brief send a series of AT commands w/o locking TX
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*
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* @param *iface: interface to use
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* @param *handler: command handler to use
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* @param *cmds: array of setup commands to send
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* @param cmds_len: size of the setup command array
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* @param *sem: wait for response semaphore
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* @param timeout: timeout of command
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*
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* @retval 0 if ok, < 0 if error.
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*/
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int modem_cmd_handler_setup_cmds_nolock(struct modem_iface *iface,
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struct modem_cmd_handler *handler,
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const struct setup_cmd *cmds,
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size_t cmds_len, struct k_sem *sem,
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k_timeout_t timeout);
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/**
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* @brief Modem command handler configuration
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*
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* @details Contains user configuration which is used to set up
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* command handler data context. The struct is initialized and then passed
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* to modem_cmd_handler_init().
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*
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* @retval 0 if ok, < 0 if error.
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* @param match_buf Buffer used for matching commands
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* @param match_buf_len Length of buffer used for matching commands
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* @param buf_pool Initialized buffer pool used to store incoming data
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* @param alloc_timeout Timeout for allocating data in buffer pool
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* @param eol End of line represented as string
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* @param user_data Free to use data which can be retrieved from within command handlers
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* @param response_cmds Array of response command handlers
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* @param response_cmds_len Length of response command handlers array
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* @param unsol_cmds Array of unsolicitet command handlers
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* @param unsol_cmds_len Length of unsolicitet command handlers array
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*/
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struct modem_cmd_handler_config {
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char *match_buf;
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size_t match_buf_len;
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struct net_buf_pool *buf_pool;
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k_timeout_t alloc_timeout;
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const char *eol;
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void *user_data;
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const struct modem_cmd *response_cmds;
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size_t response_cmds_len;
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const struct modem_cmd *unsol_cmds;
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size_t unsol_cmds_len;
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};
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/**
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* @brief Initialize modem command handler
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*
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* @details This function is called once for each command handler, before any
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* incoming data is processed.
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*
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* @note All arguments passed to this function, including the referenced data
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* contained in the setup struct, must persist as long as the command handler itself.
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*
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* @param handler Command handler to initialize
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* @param data Command handler data to use
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* @param setup Command handler setup
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*
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* @return -EINVAL if any argument is invalid
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* @return 0 if successful
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*/
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int modem_cmd_handler_init(struct modem_cmd_handler *handler,
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struct modem_cmd_handler_data *data,
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const struct modem_cmd_handler_config *config);
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/**
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* @brief Lock the modem for sending cmds
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*
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* This is semaphore-based rather than mutex based, which means there's no
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* requirements of thread ownership for the user. This function is useful
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* when one needs to prevent threads from sending UART data to the modem for an
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* extended period of time (for example during modem reset).
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*
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* @param *handler: command handler to lock
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* @param timeout: give up after timeout
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*
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* @retval 0 if ok, < 0 if error.
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*/
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int modem_cmd_handler_tx_lock(struct modem_cmd_handler *handler,
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k_timeout_t timeout);
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/**
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* @brief Unlock the modem for sending cmds
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*
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* @param *handler: command handler to unlock
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*/
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void modem_cmd_handler_tx_unlock(struct modem_cmd_handler *handler);
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/**
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* @brief Process incoming data
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*
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* @details This function will process any data available from the interface
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* using the command handler. The command handler will invoke any matching modem
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* command which has been registered using @ref modem_cmd_handler_init_cmds or
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* @ref modem_cmd_handler_update_cmds. Once handled, the function will return.
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*
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* @note This function should be invoked from a dedicated thread, which only handles
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* commands.
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*
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* @param handler The handler wich will handle the command when processed
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* @param iface The interface which receives incoming data
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*/
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static inline void modem_cmd_handler_process(struct modem_cmd_handler *handler,
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struct modem_iface *iface)
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{
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handler->process(handler, iface);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_INCLUDE_DRIVERS_MODEM_MODEM_CMD_HANDLER_H_ */
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