gnss_quectel_lcx6g.c

/*
 * Copyright (c) 2023 Trackunit Corporation
 * Copyright (c) 2023 Bjarki Arge Andreasen
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/drivers/gnss.h>
#include <zephyr/modem/chat.h>
#include <zephyr/modem/backend/uart.h>
#include <zephyr/kernel.h>
#include <zephyr/pm/device.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/pm/device_runtime.h>
#include <string.h>

#include "gnss_publish.h"
#include "gnss_nmea0183.h"
#include "gnss_nmea0183_match.h"
#include "gnss_parse.h"

#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(quectel_lcx6g, CONFIG_GNSS_LOG_LEVEL);

#define QUECTEL_LCX6G_STARTUP_DELAY           (K_MSEC(300U))
#define QUECTEL_LCX6G_STATE_CHANGE_DELAY_MSEC (300LL)
#define QUECTEL_LCX6G_PAIR_TIMEOUT            (K_SECONDS(11))
#define QUECTEL_LCX6G_SCRIPT_TIMEOUT_S        (10U)

#define QUECTEL_LCX6G_PAIR_NAV_MODE_STATIONARY (4)
#define QUECTEL_LCX6G_PAIR_NAV_MODE_FITNESS    (1)
#define QUECTEL_LCX6G_PAIR_NAV_MODE_NORMAL     (0)
#define QUECTEL_LCX6G_PAIR_NAV_MODE_DRONE      (5)

#define QUECTEL_LCX6G_PAIR_PPS_MODE_DISABLED             (0)
#define QUECTEL_LCX6G_PAIR_PPS_MODE_ENABLED              (4)
#define QUECTEL_LCX6G_PAIR_PPS_MODE_ENABLED_AFTER_LOCK   (1)
#define QUECTEL_LCX6G_PAIR_PPS_MODE_ENABLED_WHILE_LOCKED (2)

struct quectel_lcx6g_config {
	const struct device *uart;
	const enum gnss_pps_mode pps_mode;
	const uint16_t pps_pulse_width;
};

struct quectel_lcx6g_data {
	struct gnss_nmea0183_match_data match_data;
#if CONFIG_GNSS_SATELLITES
	struct gnss_satellite satellites[24];
#endif

	/* UART backend */
	struct modem_pipe *uart_pipe;
	struct modem_backend_uart uart_backend;
	uint8_t uart_backend_receive_buf[128];
	uint8_t uart_backend_transmit_buf[64];

	/* Modem chat */
	struct modem_chat chat;
	uint8_t chat_receive_buf[256];
	uint8_t chat_delimiter[2];
	uint8_t *chat_argv[32];

	/* Dynamic chat script */
	uint8_t dynamic_match_buf[32];
	uint8_t dynamic_separators_buf[2];
	uint8_t dynamic_request_buf[32];
	struct modem_chat_match dynamic_match;
	struct modem_chat_script_chat dynamic_script_chat;
	struct modem_chat_script dynamic_script;

	/* Allocation for responses from GNSS modem */
	union {
		uint16_t fix_rate_response;
		gnss_systems_t enabled_systems_response;
		enum gnss_navigation_mode navigation_mode_response;
	};

	struct k_spinlock lock;
};

#define MODEM_CHAT_SCRIPT_NO_ABORT_DEFINE(_sym, _script_chats, _callback, _timeout)             \
	static struct modem_chat_script _sym = {                                                \
		.name = #_sym,                                                                  \
		.script_chats = _script_chats,                                                  \
		.script_chats_size = ARRAY_SIZE(_script_chats),                                 \
		.abort_matches = NULL,                                                          \
		.abort_matches_size = 0,                                                        \
		.callback = _callback,                                                          \
		.timeout = _timeout,                                                            \
	}

#ifdef CONFIG_PM_DEVICE
MODEM_CHAT_MATCH_DEFINE(pair003_success_match, "$PAIR001,003,0*38", "", NULL);
MODEM_CHAT_SCRIPT_CMDS_DEFINE(
	suspend_script_cmds,
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR003*39", pair003_success_match)
);

MODEM_CHAT_SCRIPT_NO_ABORT_DEFINE(suspend_script, suspend_script_cmds,
				  NULL, QUECTEL_LCX6G_SCRIPT_TIMEOUT_S);
#endif /* CONFIG_PM_DEVICE */

MODEM_CHAT_MATCH_DEFINE(any_match, "", "", NULL);
MODEM_CHAT_MATCH_DEFINE(pair062_ack_match, "$PAIR001,062,0*3F", "", NULL);
MODEM_CHAT_SCRIPT_CMDS_DEFINE(
	resume_script_cmds,
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR002*38", any_match),
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR062,0,1*3F", pair062_ack_match),
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR062,1,0*3F", pair062_ack_match),
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR062,2,0*3C", pair062_ack_match),
#if CONFIG_GNSS_SATELLITES
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR062,3,5*38", pair062_ack_match),
#else
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR062,3,0*3D", pair062_ack_match),
#endif
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR062,4,1*3B", pair062_ack_match),
	MODEM_CHAT_SCRIPT_CMD_RESP("$PAIR062,5,0*3B", pair062_ack_match),
);

MODEM_CHAT_SCRIPT_NO_ABORT_DEFINE(resume_script, resume_script_cmds,
				  NULL, QUECTEL_LCX6G_SCRIPT_TIMEOUT_S);

MODEM_CHAT_MATCHES_DEFINE(unsol_matches,
	MODEM_CHAT_MATCH_WILDCARD("$??GGA,", ",*", gnss_nmea0183_match_gga_callback),
	MODEM_CHAT_MATCH_WILDCARD("$??RMC,", ",*", gnss_nmea0183_match_rmc_callback),
#if CONFIG_GNSS_SATELLITES
	MODEM_CHAT_MATCH_WILDCARD("$??GSV,", ",*", gnss_nmea0183_match_gsv_callback),
#endif
);

static int quectel_lcx6g_configure_pps(const struct device *dev)
{
	const struct quectel_lcx6g_config *config = dev->config;
	struct quectel_lcx6g_data *data = dev->data;
	uint8_t pps_mode = 0;
	int ret;

	switch (config->pps_mode) {
	case GNSS_PPS_MODE_DISABLED:
		pps_mode = QUECTEL_LCX6G_PAIR_PPS_MODE_DISABLED;
		break;

	case GNSS_PPS_MODE_ENABLED:
		pps_mode = QUECTEL_LCX6G_PAIR_PPS_MODE_ENABLED;
		break;

	case GNSS_PPS_MODE_ENABLED_AFTER_LOCK:
		pps_mode = QUECTEL_LCX6G_PAIR_PPS_MODE_ENABLED_AFTER_LOCK;
		break;

	case GNSS_PPS_MODE_ENABLED_WHILE_LOCKED:
		pps_mode = QUECTEL_LCX6G_PAIR_PPS_MODE_ENABLED_WHILE_LOCKED;
		break;
	}

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR752,%u,%u", pps_mode, config->pps_pulse_width);
	if (ret < 0) {
		return ret;
	}

	data->dynamic_script_chat.request_size = ret;

	ret = gnss_nmea0183_snprintk(data->dynamic_match_buf, sizeof(data->dynamic_match_buf),
				     "PAIR001,752,0");
	if (ret < 0) {
		return ret;
	}

	data->dynamic_match.match_size = ret;

	return modem_chat_run_script(&data->chat, &data->dynamic_script);
}

static int quectel_lcx6g_resume(const struct device *dev)
{
	struct quectel_lcx6g_data *data = dev->data;
	int ret;

	ret = modem_pipe_open(data->uart_pipe);
	if (ret < 0) {
		return ret;
	}

	ret = modem_chat_attach(&data->chat, data->uart_pipe);
	if (ret < 0) {
		modem_pipe_close(data->uart_pipe);
		return ret;
	}

	ret = modem_chat_run_script(&data->chat, &resume_script);
	if (ret < 0) {
		modem_pipe_close(data->uart_pipe);
		return ret;
	}

	k_msleep(1000);

	ret = quectel_lcx6g_configure_pps(dev);
	if (ret < 0) {
		modem_pipe_close(data->uart_pipe);
	}

	return ret;
}

#ifdef CONFIG_PM_DEVICE
static int quectel_lcx6g_suspend(const struct device *dev)
{
	struct quectel_lcx6g_data *data = dev->data;
	int ret;

	ret = modem_chat_run_script_run(&data->chat, &suspend_script);
	if (ret < 0) {
		modem_pipe_close(data->uart_pipe);
	}

	return ret;
}

static int quectel_lcx6g_turn_off(const struct device *dev)
{
	struct quectel_lcx6g_data *data = dev->data;

	return modem_pipe_close(data->uart_pipe);
}

static int quectel_lcx6g_pm_action(const struct device *dev, enum pm_device_action action)
{
	struct quectel_lcx6g_data *data = dev->data;
	k_spinlock_key_t key;
	int ret = -ENOTSUP;

	key = k_spin_lock(&data->lock);

	switch (action) {
	case PM_DEVICE_ACTION_SUSPEND:
		ret = quectel_lcx6g_suspend(dev);
		break;

	case PM_DEVICE_ACTION_RESUME:
		ret = quectel_lcx6g_resume(dev);
		break;

	case PM_DEVICE_ACTION_TURN_ON:
		ret = 0;
		break;

	case PM_DEVICE_ACTION_TURN_OFF:
		ret = quectel_lcx6g_turn_off(dev);
		break;

	default:
		break;
	}

	k_spin_unlock(&data->lock, key);
	return ret;
}
#endif /* CONFIG_PM_DEVICE */

static int quectel_lcx6g_set_fix_rate(const struct device *dev, uint32_t fix_interval_ms)
{
	struct quectel_lcx6g_data *data = dev->data;
	k_spinlock_key_t key;
	int ret;

	if (fix_interval_ms < 100 || fix_interval_ms > 1000) {
		return -EINVAL;
	}

	key = k_spin_lock(&data->lock);

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR050,%u", fix_interval_ms);
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	ret = gnss_nmea0183_snprintk(data->dynamic_match_buf, sizeof(data->dynamic_match_buf),
				     "PAIR001,050,0");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_match.match_size = ret;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	if (ret < 0) {
		goto unlock_return;
	}

unlock_return:
	k_spin_unlock(&data->lock, key);
	return ret;
}

static void quectel_lcx6g_get_fix_rate_callback(struct modem_chat *chat, char **argv,
						uint16_t argc, void *user_data)
{
	struct quectel_lcx6g_data *data = user_data;
	int32_t tmp;

	if (argc != 3) {
		return;
	}

	if ((gnss_parse_atoi(argv[1], 10, &tmp) < 0) || (tmp < 0) || (tmp > 1000)) {
		return;
	}

	data->fix_rate_response = (uint16_t)tmp;
}

static int quectel_lcx6g_get_fix_rate(const struct device *dev, uint32_t *fix_interval_ms)
{
	struct quectel_lcx6g_data *data = dev->data;
	k_spinlock_key_t key;
	int ret;

	key = k_spin_lock(&data->lock);

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR051");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	strncpy(data->dynamic_match_buf, "$PAIR051,", sizeof(data->dynamic_match_buf));
	data->dynamic_match.match_size = sizeof("$PAIR051,") - 1;
	data->dynamic_match.callback = quectel_lcx6g_get_fix_rate_callback;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	data->dynamic_match.callback = NULL;
	if (ret < 0) {
		goto unlock_return;
	}

	*fix_interval_ms = data->fix_rate_response;

unlock_return:
	k_spin_unlock(&data->lock, key);
	return 0;
}

static int quectel_lcx6g_set_navigation_mode(const struct device *dev,
					     enum gnss_navigation_mode mode)
{
	struct quectel_lcx6g_data *data = dev->data;
	k_spinlock_key_t key;
	uint8_t navigation_mode = 0;
	int ret;

	switch (mode) {
	case GNSS_NAVIGATION_MODE_ZERO_DYNAMICS:
		navigation_mode = QUECTEL_LCX6G_PAIR_NAV_MODE_STATIONARY;
		break;

	case GNSS_NAVIGATION_MODE_LOW_DYNAMICS:
		navigation_mode = QUECTEL_LCX6G_PAIR_NAV_MODE_FITNESS;
		break;

	case GNSS_NAVIGATION_MODE_BALANCED_DYNAMICS:
		navigation_mode = QUECTEL_LCX6G_PAIR_NAV_MODE_NORMAL;
		break;

	case GNSS_NAVIGATION_MODE_HIGH_DYNAMICS:
		navigation_mode = QUECTEL_LCX6G_PAIR_NAV_MODE_DRONE;
		break;
	}

	key = k_spin_lock(&data->lock);

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR080,%u", navigation_mode);
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	ret = gnss_nmea0183_snprintk(data->dynamic_match_buf, sizeof(data->dynamic_match_buf),
				     "PAIR001,080,0");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_match.match_size = ret;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	if (ret < 0) {
		goto unlock_return;
	}

unlock_return:
	k_spin_unlock(&data->lock, key);
	return ret;
}

static void quectel_lcx6g_get_navigation_mode_callback(struct modem_chat *chat, char **argv,
						       uint16_t argc, void *user_data)
{
	struct quectel_lcx6g_data *data = user_data;
	int32_t tmp;

	if (argc != 3) {
		return;
	}

	if ((gnss_parse_atoi(argv[1], 10, &tmp) < 0) || (tmp < 0) || (tmp > 7)) {
		return;
	}

	switch (tmp) {
	case QUECTEL_LCX6G_PAIR_NAV_MODE_FITNESS:
		data->navigation_mode_response = GNSS_NAVIGATION_MODE_LOW_DYNAMICS;
		break;

	case QUECTEL_LCX6G_PAIR_NAV_MODE_STATIONARY:
		data->navigation_mode_response = GNSS_NAVIGATION_MODE_ZERO_DYNAMICS;
		break;

	case QUECTEL_LCX6G_PAIR_NAV_MODE_DRONE:
		data->navigation_mode_response = GNSS_NAVIGATION_MODE_HIGH_DYNAMICS;
		break;

	default:
		data->navigation_mode_response = GNSS_NAVIGATION_MODE_BALANCED_DYNAMICS;
		break;
	}
}

static int quectel_lcx6g_get_navigation_mode(const struct device *dev,
					     enum gnss_navigation_mode *mode)
{
	struct quectel_lcx6g_data *data = dev->data;
	k_spinlock_key_t key;
	int ret;

	key = k_spin_lock(&data->lock);

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR081");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	strncpy(data->dynamic_match_buf, "$PAIR081,", sizeof(data->dynamic_match_buf));
	data->dynamic_match.match_size = sizeof("$PAIR081,") - 1;
	data->dynamic_match.callback = quectel_lcx6g_get_navigation_mode_callback;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	data->dynamic_match.callback = NULL;
	if (ret < 0) {
		goto unlock_return;
	}

	*mode = data->navigation_mode_response;

unlock_return:
	k_spin_unlock(&data->lock, key);
	return ret;
}

static int quectel_lcx6g_set_enabled_systems(const struct device *dev, gnss_systems_t systems)
{
	struct quectel_lcx6g_data *data = dev->data;
	gnss_systems_t supported_systems;
	k_spinlock_key_t key;
	int ret;

	supported_systems = (GNSS_SYSTEM_GPS | GNSS_SYSTEM_GLONASS | GNSS_SYSTEM_GALILEO |
			     GNSS_SYSTEM_BEIDOU | GNSS_SYSTEM_QZSS | GNSS_SYSTEM_SBAS);

	if ((~supported_systems) & systems) {
		return -EINVAL;
	}

	key = k_spin_lock(&data->lock);

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR066,%u,%u,%u,%u,%u,0",
				     (0 < (systems & GNSS_SYSTEM_GPS)),
				     (0 < (systems & GNSS_SYSTEM_GLONASS)),
				     (0 < (systems & GNSS_SYSTEM_GALILEO)),
				     (0 < (systems & GNSS_SYSTEM_BEIDOU)),
				     (0 < (systems & GNSS_SYSTEM_QZSS)));
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	ret = gnss_nmea0183_snprintk(data->dynamic_match_buf, sizeof(data->dynamic_match_buf),
				     "PAIR001,066,0");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_match.match_size = ret;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	if (ret < 0) {
		goto unlock_return;
	}

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR410,%u", (0 < (systems & GNSS_SYSTEM_SBAS)));
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	ret = gnss_nmea0183_snprintk(data->dynamic_match_buf, sizeof(data->dynamic_match_buf),
				     "PAIR001,410,0");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_match.match_size = ret;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	if (ret < 0) {
		goto unlock_return;
	}

unlock_return:
	k_spin_unlock(&data->lock, key);
	return ret;
}

static inline bool search_mode_enabled(const char *arg)
{
	return arg[0] == '1';
}

static void quectel_lcx6g_get_search_mode_callback(struct modem_chat *chat, char **argv,
						   uint16_t argc, void *user_data)
{
	struct quectel_lcx6g_data *data = user_data;

	if (argc != 8) {
		return;
	}

	data->enabled_systems_response = search_mode_enabled(argv[1]) ? GNSS_SYSTEM_GPS : 0;
	data->enabled_systems_response |= search_mode_enabled(argv[2]) ? GNSS_SYSTEM_GLONASS : 0;
	data->enabled_systems_response |= search_mode_enabled(argv[3]) ? GNSS_SYSTEM_GALILEO : 0;
	data->enabled_systems_response |= search_mode_enabled(argv[4]) ? GNSS_SYSTEM_BEIDOU : 0;
	data->enabled_systems_response |= search_mode_enabled(argv[5]) ? GNSS_SYSTEM_QZSS : 0;
}

static void quectel_lcx6g_get_sbas_status_callback(struct modem_chat *chat, char **argv,
						   uint16_t argc, void *user_data)
{
	struct quectel_lcx6g_data *data = user_data;

	if (argc != 3) {
		return;
	}

	data->enabled_systems_response |= ('1' == argv[1][0]) ? GNSS_SYSTEM_SBAS : 0;
}


static int quectel_lcx6g_get_enabled_systems(const struct device *dev, gnss_systems_t *systems)
{
	struct quectel_lcx6g_data *data = dev->data;
	k_spinlock_key_t key;
	int ret;

	key = k_spin_lock(&data->lock);

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR067");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	strncpy(data->dynamic_match_buf, "$PAIR067,", sizeof(data->dynamic_match_buf));
	data->dynamic_match.match_size = sizeof("$PAIR067,") - 1;
	data->dynamic_match.callback = quectel_lcx6g_get_search_mode_callback;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	data->dynamic_match.callback = NULL;
	if (ret < 0) {
		goto unlock_return;
	}

	ret = gnss_nmea0183_snprintk(data->dynamic_request_buf, sizeof(data->dynamic_request_buf),
				     "PAIR411");
	if (ret < 0) {
		goto unlock_return;
	}

	data->dynamic_script_chat.request_size = ret;

	strncpy(data->dynamic_match_buf, "$PAIR411,", sizeof(data->dynamic_match_buf));
	data->dynamic_match.match_size = sizeof("$PAIR411,") - 1;
	data->dynamic_match.callback = quectel_lcx6g_get_sbas_status_callback;

	ret = modem_chat_run_script(&data->chat, &data->dynamic_script);
	data->dynamic_match.callback = NULL;
	if (ret < 0) {
		goto unlock_return;
	}

	*systems = data->enabled_systems_response;

unlock_return:
	k_spin_unlock(&data->lock, key);
	return ret;
}

static int quectel_lcx6g_get_supported_systems(const struct device *dev, gnss_systems_t *systems)
{
	*systems = (GNSS_SYSTEM_GPS | GNSS_SYSTEM_GLONASS | GNSS_SYSTEM_GALILEO |
		    GNSS_SYSTEM_BEIDOU | GNSS_SYSTEM_QZSS | GNSS_SYSTEM_SBAS);
	return 0;
}

static struct gnss_driver_api gnss_api = {
	.set_fix_rate = quectel_lcx6g_set_fix_rate,
	.get_fix_rate = quectel_lcx6g_get_fix_rate,
	.set_navigation_mode = quectel_lcx6g_set_navigation_mode,
	.get_navigation_mode = quectel_lcx6g_get_navigation_mode,
	.set_enabled_systems = quectel_lcx6g_set_enabled_systems,
	.get_enabled_systems = quectel_lcx6g_get_enabled_systems,
	.get_supported_systems = quectel_lcx6g_get_supported_systems,
};

static int quectel_lcx6g_init_nmea0183_match(const struct device *dev)
{
	struct quectel_lcx6g_data *data = dev->data;

	const struct gnss_nmea0183_match_config config = {
		.gnss = dev,
#if CONFIG_GNSS_SATELLITES
		.satellites = data->satellites,
		.satellites_size = ARRAY_SIZE(data->satellites),
#endif
		.timeout_ms = 50,
	};

	return gnss_nmea0183_match_init(&data->match_data, &config);
}

static void quectel_lcx6g_init_pipe(const struct device *dev)
{
	const struct quectel_lcx6g_config *config = dev->config;
	struct quectel_lcx6g_data *data = dev->data;

	const struct modem_backend_uart_config uart_backend_config = {
		.uart = config->uart,
		.receive_buf = data->uart_backend_receive_buf,
		.receive_buf_size = ARRAY_SIZE(data->uart_backend_receive_buf),
		.transmit_buf = data->uart_backend_transmit_buf,
		.transmit_buf_size = ARRAY_SIZE(data->uart_backend_transmit_buf),
	};

	data->uart_pipe = modem_backend_uart_init(&data->uart_backend, &uart_backend_config);
}

static int quectel_lcx6g_init_chat(const struct device *dev)
{
	struct quectel_lcx6g_data *data = dev->data;

	const struct modem_chat_config chat_config = {
		.user_data = data,
		.receive_buf = data->chat_receive_buf,
		.receive_buf_size = ARRAY_SIZE(data->chat_receive_buf),
		.delimiter = data->chat_delimiter,
		.delimiter_size = ARRAY_SIZE(data->chat_delimiter),
		.filter = NULL,
		.filter_size = 0,
		.argv = data->chat_argv,
		.argv_size = ARRAY_SIZE(data->chat_argv),
		.unsol_matches = unsol_matches,
		.unsol_matches_size = ARRAY_SIZE(unsol_matches),
		.process_timeout = K_MSEC(2),
	};

	return modem_chat_init(&data->chat, &chat_config);
}

static void quectel_lcx6g_init_dynamic_script(const struct device *dev)
{
	struct quectel_lcx6g_data *data = dev->data;

	data->dynamic_match.match = data->dynamic_match_buf;
	data->dynamic_match.separators = data->dynamic_separators_buf;
	data->dynamic_match.separators_size = sizeof(data->dynamic_separators_buf);
	data->dynamic_match.wildcards = false;
	data->dynamic_match.partial = false;

	data->dynamic_script_chat.request = data->dynamic_request_buf;
	data->dynamic_script_chat.response_matches = &data->dynamic_match;
	data->dynamic_script_chat.response_matches_size = 1;
	data->dynamic_script_chat.timeout = 0;

	data->dynamic_script.name = "pair";
	data->dynamic_script.script_chats = &data->dynamic_script_chat;
	data->dynamic_script.script_chats_size = 1;
	data->dynamic_script.abort_matches = NULL;
	data->dynamic_script.abort_matches_size = 0;
	data->dynamic_script.callback = NULL;
	data->dynamic_script.timeout = 10;
}

static int quectel_lcx6g_init(const struct device *dev)
{
	int ret;

	LOG_INF("Initializing Quectel LCX6G");
	ret = quectel_lcx6g_init_nmea0183_match(dev);
	if (ret < 0) {
		return ret;
	}

	quectel_lcx6g_init_pipe(dev);

	ret = quectel_lcx6g_init_chat(dev);
	if (ret < 0) {
		return ret;
	}

	quectel_lcx6g_init_dynamic_script(dev);

#ifdef CONFIG_PM_DEVICE_RUNTIME
	pm_device_init_suspended(dev);
#else
	LOG_INF("Resuming Quectel LCX6G");
	ret = quectel_lcx6g_resume(dev);
	if (ret < 0) {
		LOG_ERR("Failed to resume Quectel LCX6G");
		return ret;
	}
#endif
	LOG_INF("Quectel LCX6G initialized");
	return 0;
}

#define LCX6G_INST_NAME(inst, name) \
	_CONCAT(_CONCAT(_CONCAT(name, _), DT_DRV_COMPAT), inst)

#define LCX6G_DEVICE(inst)								\
	static struct quectel_lcx6g_config LCX6G_INST_NAME(inst, config) = {		\
		.uart = DEVICE_DT_GET(DT_INST_BUS(inst)),				\
		.pps_mode = DT_INST_STRING_UPPER_TOKEN(inst, pps_mode),			\
		.pps_pulse_width = DT_INST_PROP(inst, pps_pulse_width),			\
	};										\
											\
	static struct quectel_lcx6g_data LCX6G_INST_NAME(inst, data) = {		\
		.chat_delimiter = {'\r', '\n'},						\
		.dynamic_separators_buf = {',', '*'},					\
	};										\
											\
	PM_DEVICE_DT_INST_DEFINE(inst, quectel_lcx6g_pm_action);			\
											\
	DEVICE_DT_INST_DEFINE(inst, quectel_lcx6g_init, PM_DEVICE_DT_INST_GET(inst),	\
			 &LCX6G_INST_NAME(inst, data), &LCX6G_INST_NAME(inst, config),	\
			 POST_KERNEL, CONFIG_GNSS_INIT_PRIORITY, &gnss_api);

#define DT_DRV_COMPAT quectel_lc26g
DT_INST_FOREACH_STATUS_OKAY(LCX6G_DEVICE)
#undef DT_DRV_COMPAT

#define DT_DRV_COMPAT quectel_lc76g
DT_INST_FOREACH_STATUS_OKAY(LCX6G_DEVICE)
#undef DT_DRV_COMPAT

#define DT_DRV_COMPAT quectel_lc86g
DT_INST_FOREACH_STATUS_OKAY(LCX6G_DEVICE)
#undef DT_DRV_COMPAT