/* * Copyright (c) 2022 Trackunit Corporation * * SPDX-License-Identifier: Apache-2.0 */ #include #include #include #include #include #ifndef ZEPHYR_MODEM_CHAT_ #define ZEPHYR_MODEM_CHAT_ #ifdef __cplusplus extern "C" { #endif struct modem_chat; /** * @brief Callback called when matching chat is received * * @param chat Pointer to chat instance instance * @param argv Pointer to array of parsed arguments * @param argc Number of parsed arguments, arg 0 holds the exact match * @param user_data Free to use user data set during modem_chat_init() */ typedef void (*modem_chat_match_callback)(struct modem_chat *chat, char **argv, uint16_t argc, void *user_data); /** * @brief Modem chat match */ struct modem_chat_match { /** Match array */ const uint8_t *match; /** Size of match */ uint8_t match_size; /** Separators array */ const uint8_t *separators; /** Size of separators array */ uint8_t separators_size; /** Set if modem chat instance shall use wildcards when matching */ uint8_t wildcards : 1; /** Set if script shall not continue to next step in case of match */ uint8_t partial : 1; /** Type of modem chat instance */ modem_chat_match_callback callback; }; #define MODEM_CHAT_MATCH(_match, _separators, _callback) \ { \ .match = (uint8_t *)(_match), .match_size = (uint8_t)(sizeof(_match) - 1), \ .separators = (uint8_t *)(_separators), \ .separators_size = (uint8_t)(sizeof(_separators) - 1), .wildcards = false, \ .callback = _callback, \ } #define MODEM_CHAT_MATCH_WILDCARD(_match, _separators, _callback) \ { \ .match = (uint8_t *)(_match), .match_size = (uint8_t)(sizeof(_match) - 1), \ .separators = (uint8_t *)(_separators), \ .separators_size = (uint8_t)(sizeof(_separators) - 1), .wildcards = true, \ .callback = _callback, \ } #define MODEM_CHAT_MATCH_INITIALIZER(_match, _separators, _callback, _wildcards, _partial) \ { \ .match = (uint8_t *)(_match), \ .match_size = (uint8_t)(sizeof(_match) - 1), \ .separators = (uint8_t *)(_separators), \ .separators_size = (uint8_t)(sizeof(_separators) - 1), \ .wildcards = _wildcards, \ .partial = _partial, \ .callback = _callback, \ } #define MODEM_CHAT_MATCH_DEFINE(_sym, _match, _separators, _callback) \ const static struct modem_chat_match _sym = MODEM_CHAT_MATCH(_match, _separators, _callback) #define MODEM_CHAT_MATCHES_DEFINE(_sym, ...) \ const static struct modem_chat_match _sym[] = {__VA_ARGS__} /** * @brief Modem chat script chat */ struct modem_chat_script_chat { /** Request to send to modem */ const uint8_t *request; /** Size of request */ uint16_t request_size; /** Expected responses to request */ const struct modem_chat_match *response_matches; /** Number of elements in expected responses */ uint16_t response_matches_size; /** Timeout before chat script may continue to next step in milliseconds */ uint16_t timeout; }; #define MODEM_CHAT_SCRIPT_CMD_RESP(_request, _response_match) \ { \ .request = (uint8_t *)(_request), \ .request_size = (uint16_t)(sizeof(_request) - 1), \ .response_matches = &_response_match, \ .response_matches_size = 1, \ .timeout = 0, \ } #define MODEM_CHAT_SCRIPT_CMD_RESP_MULT(_request, _response_matches) \ { \ .request = (uint8_t *)(_request), \ .request_size = (uint16_t)(sizeof(_request) - 1), \ .response_matches = _response_matches, \ .response_matches_size = ARRAY_SIZE(_response_matches), \ .timeout = 0, \ } #define MODEM_CHAT_SCRIPT_CMD_RESP_NONE(_request, _timeout) \ { \ .request = (uint8_t *)(_request), \ .request_size = (uint16_t)(sizeof(_request) - 1), \ .response_matches = NULL, \ .response_matches_size = 0, \ .timeout = _timeout, \ } #define MODEM_CHAT_SCRIPT_CMDS_DEFINE(_sym, ...) \ const struct modem_chat_script_chat _sym[] = {__VA_ARGS__} enum modem_chat_script_result { MODEM_CHAT_SCRIPT_RESULT_SUCCESS, MODEM_CHAT_SCRIPT_RESULT_ABORT, MODEM_CHAT_SCRIPT_RESULT_TIMEOUT }; /** * @brief Callback called when script chat is received * * @param chat Pointer to chat instance instance * @param result Result of script execution * @param user_data Free to use user data set during modem_chat_init() */ typedef void (*modem_chat_script_callback)(struct modem_chat *chat, enum modem_chat_script_result result, void *user_data); /** * @brief Modem chat script */ struct modem_chat_script { /** Name of script */ const char *name; /** Array of script chats */ const struct modem_chat_script_chat *script_chats; /** Elements in array of script chats */ uint16_t script_chats_size; /** Array of abort matches */ const struct modem_chat_match *abort_matches; /** Number of elements in array of abort matches */ uint16_t abort_matches_size; /** Callback called when script execution terminates */ modem_chat_script_callback callback; /** Timeout in seconds within which the script execution must terminate */ uint32_t timeout; }; #define MODEM_CHAT_SCRIPT_DEFINE(_sym, _script_chats, _abort_matches, _callback, _timeout) \ const static struct modem_chat_script _sym = { \ .name = #_sym, \ .script_chats = _script_chats, \ .script_chats_size = ARRAY_SIZE(_script_chats), \ .abort_matches = _abort_matches, \ .abort_matches_size = ARRAY_SIZE(_abort_matches), \ .callback = _callback, \ .timeout = _timeout, \ } enum modem_chat_script_send_state { /* No data to send */ MODEM_CHAT_SCRIPT_SEND_STATE_IDLE, /* Sending request */ MODEM_CHAT_SCRIPT_SEND_STATE_REQUEST, /* Sending delimiter */ MODEM_CHAT_SCRIPT_SEND_STATE_DELIMITER, }; /** * @brief Chat instance internal context * @warning Do not modify any members of this struct directly */ struct modem_chat { /* Pipe used to send and receive data */ struct modem_pipe *pipe; /* User data passed with match callbacks */ void *user_data; /* Receive buffer */ uint8_t *receive_buf; uint16_t receive_buf_size; uint16_t receive_buf_len; /* Work buffer */ uint8_t work_buf[32]; uint16_t work_buf_len; /* Chat delimiter */ uint8_t *delimiter; uint16_t delimiter_size; uint16_t delimiter_match_len; /* Array of bytes which are discarded out by parser */ uint8_t *filter; uint16_t filter_size; /* Parsed arguments */ uint8_t **argv; uint16_t argv_size; uint16_t argc; /* Matches * Index 0 -> Response matches * Index 1 -> Abort matches * Index 2 -> Unsolicited matches */ const struct modem_chat_match *matches[3]; uint16_t matches_size[3]; /* Script execution */ const struct modem_chat_script *script; const struct modem_chat_script *pending_script; struct k_work script_run_work; struct k_work_delayable script_timeout_work; struct k_work script_abort_work; uint16_t script_chat_it; atomic_t script_state; enum modem_chat_script_result script_result; struct k_sem script_stopped_sem; /* Script sending */ enum modem_chat_script_send_state script_send_state; uint16_t script_send_pos; struct k_work script_send_work; struct k_work_delayable script_send_timeout_work; /* Match parsing */ const struct modem_chat_match *parse_match; uint16_t parse_match_len; uint16_t parse_arg_len; uint16_t parse_match_type; /* Process received data */ struct k_work receive_work; }; /** * @brief Chat configuration */ struct modem_chat_config { /** Free to use user data passed with modem match callbacks */ void *user_data; /** Receive buffer used to store parsed arguments */ uint8_t *receive_buf; /** Size of receive buffer should be longest line + longest match */ uint16_t receive_buf_size; /** Delimiter */ uint8_t *delimiter; /** Size of delimiter */ uint8_t delimiter_size; /** Bytes which are discarded by parser */ uint8_t *filter; /** Size of filter */ uint8_t filter_size; /** Array of pointers used to point to parsed arguments */ uint8_t **argv; /** Elements in array of pointers */ uint16_t argv_size; /** Array of unsolicited matches */ const struct modem_chat_match *unsol_matches; /** Elements in array of unsolicited matches */ uint16_t unsol_matches_size; }; /** * @brief Initialize modem pipe chat instance * @param chat Chat instance * @param config Configuration which shall be applied to Chat instance * @note Chat instance must be attached to pipe */ int modem_chat_init(struct modem_chat *chat, const struct modem_chat_config *config); /** * @brief Attach modem chat instance to pipe * @param chat Chat instance * @param pipe Pipe instance to attach Chat instance to * @returns 0 if successful * @returns negative errno code if failure * @note Chat instance is enabled if successful */ int modem_chat_attach(struct modem_chat *chat, struct modem_pipe *pipe); /** * @brief Run script asynchronously * @param chat Chat instance * @param script Script to run * @returns 0 if script successfully started * @returns -EBUSY if a script is currently running * @returns -EPERM if modem pipe is not attached * @returns -EINVAL if arguments or script is invalid * @note Script runs asynchronously until complete or aborted. */ int modem_chat_run_script_async(struct modem_chat *chat, const struct modem_chat_script *script); /** * @brief Run script * @param chat Chat instance * @param script Script to run * @returns 0 if successful * @returns -EBUSY if a script is currently running * @returns -EPERM if modem pipe is not attached * @returns -EINVAL if arguments or script is invalid * @note Script runs until complete or aborted. */ int modem_chat_run_script(struct modem_chat *chat, const struct modem_chat_script *script); /** * @brief Run script asynchronously * @note Function exists for backwards compatibility and should be deprecated * @param chat Chat instance * @param script Script to run * @returns 0 if script successfully started * @returns -EBUSY if a script is currently running * @returns -EPERM if modem pipe is not attached * @returns -EINVAL if arguments or script is invalid */ static inline int modem_chat_script_run(struct modem_chat *chat, const struct modem_chat_script *script) { return modem_chat_run_script_async(chat, script); } /** * @brief Abort script * @param chat Chat instance */ void modem_chat_script_abort(struct modem_chat *chat); /** * @brief Release pipe from chat instance * @param chat Chat instance */ void modem_chat_release(struct modem_chat *chat); #ifdef __cplusplus } #endif #endif /* ZEPHYR_MODEM_CHAT_ */