feat: 添加模块生命周期管理框架并重构现有模块

添加了模块生命周期管理头文件 module_lifecycle.h，定义了完整的生命周期状态机，
包括初始化、运行、停止、挂起和错误状态。同时将电池模块、BLE BAS模块、BLE HID
模块和BLE NUS模块重构为使用新的生命周期框架进行状态管理。

提升日志缓冲区大小以支持更详细的调试信息记录。

inc/module_lifecycle.h

@@ -0,0 +1,204 @@
+#ifndef MODULE_LIFECYCLE_H_
+#define MODULE_LIFECYCLE_H_
+
+#include <errno.h>
+#include <stdbool.h>
+
+#include <caf/events/module_state_event.h>
+
+enum module_lifecycle {
+	LC_UNINIT,
+	LC_RUNNING,
+	LC_STOPPED,
+	LC_SUSPENDED,
+	LC_ERROR,
+};
+
+enum module_lifecycle_mode {
+	ML_MODE_NONE,
+	ML_MODE_POWER,
+	ML_MODE_SUSPEND,
+};
+
+struct module_lifecycle_ops {
+	int (*do_init)(void);
+	int (*do_start)(void);
+	int (*do_stop)(void);
+};
+
+struct module_lifecycle_cfg {
+	enum module_lifecycle_mode mode;
+	enum module_state stopped_state;
+};
+
+struct module_lifecycle_ctx {
+	enum module_lifecycle state;
+	const struct module_lifecycle_cfg *cfg;
+	const struct module_lifecycle_ops *ops;
+};
+
+static inline bool module_lifecycle_is_running(
+	const struct module_lifecycle_ctx *ctx)
+{
+	return ctx->state == LC_RUNNING;
+}
+
+static inline bool module_lifecycle_is_initialized(
+	const struct module_lifecycle_ctx *ctx)
+{
+	return (ctx->state != LC_UNINIT) && (ctx->state != LC_ERROR);
+}
+
+static inline bool module_lifecycle_reports_stopped_state(
+	const struct module_lifecycle_ctx *ctx)
+{
+	return ctx->cfg->mode != ML_MODE_NONE;
+}
+
+static inline int module_lifecycle_report_state(
+	struct module_lifecycle_ctx *ctx,
+	enum module_lifecycle state)
+{
+	switch (state) {
+	case LC_RUNNING:
+		module_set_state(MODULE_STATE_READY);
+		return 0;
+
+	case LC_STOPPED:
+		if (!module_lifecycle_reports_stopped_state(ctx)) {
+			return 0;
+		}
+
+		module_set_state(ctx->cfg->stopped_state);
+		return 0;
+
+	case LC_SUSPENDED:
+		module_set_state(MODULE_STATE_SUSPENDED);
+		return 0;
+
+	case LC_ERROR:
+		module_set_state(MODULE_STATE_ERROR);
+		return 0;
+
+	case LC_UNINIT:
+	default:
+		return -EINVAL;
+	}
+}
+
+static inline int module_lifecycle_fail(struct module_lifecycle_ctx *ctx, int err)
+{
+	ctx->state = LC_ERROR;
+	(void)module_lifecycle_report_state(ctx, LC_ERROR);
+
+	return err ? err : -EIO;
+}
+
+static inline int module_lifecycle_do_init(struct module_lifecycle_ctx *ctx)
+{
+	int err = ctx->ops->do_init();
+
+	if (err) {
+		return module_lifecycle_fail(ctx, err);
+	}
+
+	return 0;
+}
+
+static inline int module_lifecycle_do_start(struct module_lifecycle_ctx *ctx,
+					    enum module_lifecycle target)
+{
+	int err = ctx->ops->do_start();
+
+	if (err) {
+		return module_lifecycle_fail(ctx, err);
+	}
+
+	ctx->state = target;
+	return module_lifecycle_report_state(ctx, target);
+}
+
+static inline int module_lifecycle_do_stop(struct module_lifecycle_ctx *ctx,
+					   enum module_lifecycle target)
+{
+	int err = ctx->ops->do_stop();
+
+	if (err) {
+		return module_lifecycle_fail(ctx, err);
+	}
+
+	ctx->state = target;
+	return module_lifecycle_report_state(ctx, target);
+}
+
+static inline int module_set_lifecycle(struct module_lifecycle_ctx *ctx,
+				       enum module_lifecycle target)
+{
+	if ((ctx == NULL) || (ctx->cfg == NULL) || (ctx->ops == NULL) ||
+	    (ctx->ops->do_init == NULL) || (ctx->ops->do_start == NULL) ||
+	    (ctx->ops->do_stop == NULL)) {
+		return -EINVAL;
+	}
+
+	if (ctx->state == LC_ERROR) {
+		return -EFAULT;
+	}
+
+	if (ctx->state == target) {
+		return 0;
+	}
+
+	if (target == LC_ERROR) {
+		return module_lifecycle_fail(ctx, -EIO);
+	}
+
+	switch (ctx->state) {
+	case LC_UNINIT:
+		if (target == LC_RUNNING) {
+			int err = module_lifecycle_do_init(ctx);
+
+			if (err) {
+				return err;
+			}
+
+			ctx->state = LC_STOPPED;
+			return module_lifecycle_do_start(ctx, LC_RUNNING);
+		}
+
+		if (target == LC_STOPPED) {
+			int err = module_lifecycle_do_init(ctx);
+
+			if (err) {
+				return err;
+			}
+
+			ctx->state = LC_STOPPED;
+			return module_lifecycle_report_state(ctx, LC_STOPPED);
+		}
+
+		break;
+
+	case LC_RUNNING:
+		if ((target == LC_STOPPED) || (target == LC_SUSPENDED)) {
+			return module_lifecycle_do_stop(ctx, target);
+		}
+
+		break;
+
+	case LC_STOPPED:
+	case LC_SUSPENDED:
+		if (target == LC_RUNNING) {
+			return module_lifecycle_do_start(ctx, LC_RUNNING);
+		}
+
+		break;
+
+	case LC_ERROR:
+	default:
+		break;
+	}
+
+	return -EPERM;
+}
+
+#endif /* MODULE_LIFECYCLE_H_ */

prj.conf

@@ -26,7 +26,10 @@ CONFIG_FLASH_MAP=y
 CONFIG_NVS=y
 CONFIG_HEAP_MEM_POOL_SIZE=4096
 CONFIG_LOG=y
+CONFIG_LOG_BUFFER_SIZE=16384
+CONFIG_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE=16384
 CONFIG_ASSERT=y
+CONFIG_SEGGER_RTT_BUFFER_SIZE_UP=16384
 CONFIG_APP_EVENT_MANAGER_MAX_EVENT_CNT=64
 CONFIG_LED_STRIP=y
 CONFIG_WS2812_STRIP_SPI=y

src/battery_module.c

@@ -18,6 +18,7 @@
 #include <zephyr/pm/device.h>
 
 #include "bat_state_event.h"
+#include "module_lifecycle.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
@@ -32,17 +33,43 @@ BUILD_ASSERT(DT_NODE_HAS_STATUS(VBATT_NODE, okay),
 BUILD_ASSERT(DT_NODE_HAS_STATUS(IP5306_NODE, okay),
 	     "Missing ip5306 node in devicetree");
 
-static const struct device *const vbatt_dev = DEVICE_DT_GET(VBATT_NODE);
+struct battery_module_ctx {
-static const struct device *const ip5306_dev = DEVICE_DT_GET(IP5306_NODE);
+	struct module_lifecycle_ctx lc;
-static struct k_work_delayable battery_sample_work;
+	const struct device *vbatt_dev;
-static struct {
+	const struct device *ip5306_dev;
+	struct k_work_delayable battery_sample_work;
+	struct {
 		bool valid;
 		uint8_t soc;
 		bool charging;
 		bool full;
 	} last_bat_state;
-static bool initialized;
+};
-static bool running;
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct battery_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.vbatt_dev = DEVICE_DT_GET(VBATT_NODE),
+	.ip5306_dev = DEVICE_DT_GET(IP5306_NODE),
+};
 
 static int sensor_value_to_mv(const struct sensor_value *value)
 {
@@ -53,7 +80,7 @@ static int measurement_enable(bool enable)
 {
 	enum pm_device_action action = enable ? PM_DEVICE_ACTION_RESUME
 					      : PM_DEVICE_ACTION_SUSPEND;
-	int err = pm_device_action_run(vbatt_dev, action);
+	int err = pm_device_action_run(ctx.vbatt_dev, action);
 
 	if (err && (err != -EALREADY) && (err != -ENOTSUP)) {
 		LOG_ERR("Cannot %s vbatt sensor (%d)", enable ? "resume" : "suspend", err);
@@ -90,23 +117,23 @@ static void battery_sample_fn(struct k_work *work)
 
 	ARG_UNUSED(work);
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return;
 	}
 
-	err = sensor_sample_fetch(vbatt_dev);
+	err = sensor_sample_fetch(ctx.vbatt_dev);
 	if (err) {
 		LOG_WRN("Battery sample fetch failed (%d)", err);
 		goto reschedule;
 	}
 
-	err = sensor_channel_get(vbatt_dev, SENSOR_CHAN_VOLTAGE, &voltage);
+	err = sensor_channel_get(ctx.vbatt_dev, SENSOR_CHAN_VOLTAGE, &voltage);
 	if (err) {
 		LOG_WRN("Battery channel get failed (%d)", err);
 		goto reschedule;
 	}
 
-	err = ip5306_get_status(ip5306_dev, &pmic_status);
+	err = ip5306_get_status(ctx.ip5306_dev, &pmic_status);
 	if (err) {
 		LOG_WRN("IP5306 status read failed (%d)", err);
 		goto reschedule;
@@ -115,53 +142,53 @@ static void battery_sample_fn(struct k_work *work)
 	voltage_mv = sensor_value_to_mv(&voltage);
 	uint8_t soc = battery_soc_from_mv(voltage_mv);
 
-	if (!last_bat_state.valid ||
+	if (!ctx.last_bat_state.valid ||
-	    (last_bat_state.soc != soc) ||
+	    (ctx.last_bat_state.soc != soc) ||
-	    (last_bat_state.charging != pmic_status.charging) ||
+	    (ctx.last_bat_state.charging != pmic_status.charging) ||
-	    (last_bat_state.full != pmic_status.full)) {
+	    (ctx.last_bat_state.full != pmic_status.full)) {
-		last_bat_state.valid = true;
+		ctx.last_bat_state.valid = true;
-		last_bat_state.soc = soc;
+		ctx.last_bat_state.soc = soc;
-		last_bat_state.charging = pmic_status.charging;
+		ctx.last_bat_state.charging = pmic_status.charging;
-		last_bat_state.full = pmic_status.full;
+		ctx.last_bat_state.full = pmic_status.full;
 		submit_bat_state_event(soc, pmic_status.charging, pmic_status.full);
 	}
 
 reschedule:
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
-		k_work_reschedule(&battery_sample_work, BATTERY_SAMPLE_INTERVAL);
+		k_work_reschedule(&ctx.battery_sample_work, BATTERY_SAMPLE_INTERVAL);
 	}
 }
 
-static int module_init(void)
+static int do_init(void)
 {
-	if (!device_is_ready(vbatt_dev)) {
+	if (!device_is_ready(ctx.vbatt_dev)) {
 		LOG_ERR("vbatt device not ready");
 		return -ENODEV;
 	}
 
-	if (!device_is_ready(ip5306_dev)) {
+	if (!device_is_ready(ctx.ip5306_dev)) {
 		LOG_ERR("ip5306 device not ready");
 		return -ENODEV;
 	}
 
-	int err = ip5306_init(ip5306_dev);
+	int err = ip5306_init(ctx.ip5306_dev);
 	if (err) {
 		LOG_ERR("ip5306 init failed (%d)", err);
 		return err;
 	}
 
-	k_work_init_delayable(&battery_sample_work, battery_sample_fn);
+	k_work_init_delayable(&ctx.battery_sample_work, battery_sample_fn);
-	memset(&last_bat_state, 0, sizeof(last_bat_state));
+	memset(&ctx.last_bat_state, 0, sizeof(ctx.last_bat_state));
 	power_manager_restrict(MODULE_IDX(MODULE), POWER_MANAGER_LEVEL_SUSPENDED);
 
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
 	int err;
 
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
@@ -170,21 +197,21 @@ static int module_start(void)
 		return err;
 	}
 
-	running = true;
+	k_work_reschedule(&ctx.battery_sample_work, K_NO_WAIT);
-	k_work_reschedule(&battery_sample_work, K_NO_WAIT);
 
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	(void)k_work_cancel_delayable(&battery_sample_work);
+	(void)k_work_cancel_delayable(&ctx.battery_sample_work);
 	(void)measurement_enable(false);
-	running = false;
+
+	return 0;
 }
 
 static bool app_event_handler(const struct app_event_header *aeh)
@@ -193,47 +220,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		const struct module_state_event *event = cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/ble_bas_module.c

@@ -11,34 +11,54 @@
 #include <zephyr/logging/log.h>
 
 #include "bat_state_event.h"
+#include "module_lifecycle.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
-static uint8_t current_soc = 100U;
+struct ble_bas_module_ctx {
-static bool initialized;
+	struct module_lifecycle_ctx lc;
-static bool running;
+	uint8_t current_soc;
-static bool ble_ready;
+	bool ble_ready;
+};
 
-static int module_init(void)
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_NONE,
+	.stopped_state = MODULE_STATE_OFF,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct ble_bas_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.current_soc = 100U,
+};
+
+static int do_init(void)
 {
 	return 0;
 }
 
-static int module_start(void)
+static int bas_update_level(void)
 {
-	int err;
+	int err = bt_bas_set_battery_level(ctx.current_soc);
 
-	if (running) {
+	if ((err == -EAGAIN) || (err == -ENOTCONN)) {
+		LOG_INF("BAS notify deferred (%d)", err);
 		return 0;
 	}
 
-	running = true;
-
-	if (!ble_ready) {
-		return 0;
-	}
-
-	err = bt_bas_set_battery_level(current_soc);
 	if (err) {
 		LOG_WRN("bt_bas_set_battery_level failed (%d)", err);
 		return err;
@@ -47,21 +67,30 @@ static int module_start(void)
 	return 0;
 }
 
-static void module_pause(void)
+static int do_start(void)
 {
-	running = false;
+	if (module_lifecycle_is_running(&ctx.lc)) {
+		return 0;
+	}
+
+	if (!ctx.ble_ready) {
+		return 0;
+	}
+
+	return bas_update_level();
+}
+
+static int do_stop(void)
+{
+	return 0;
 }
 
 static bool handle_bat_state_event(const struct bat_state_event *event)
 {
-	current_soc = event->soc;
+	ctx.current_soc = event->soc;
 
-	if (running && ble_ready) {
+	if (module_lifecycle_is_running(&ctx.lc) && ctx.ble_ready) {
-		int err = bt_bas_set_battery_level(current_soc);
+		(void)bas_update_level();
-
-		if (err) {
-			LOG_WRN("bt_bas_set_battery_level failed (%d)", err);
-		}
 	}
 
 	return false;
@@ -75,38 +104,22 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
-
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
+			(void)module_set_lifecycle(&ctx.lc,
-				err = module_init();
+						   ctx.ble_ready ? LC_RUNNING :
-				if (err) {
+								   LC_STOPPED);
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			}
 
 			return false;
 		}
 
 		if (check_state(event, MODULE_ID(ble_state), MODULE_STATE_READY)) {
-			ble_ready = true;
+			ctx.ble_ready = true;
 
-			if (running) {
+			if (ctx.lc.state == LC_STOPPED) {
-				err = bt_bas_set_battery_level(current_soc);
+				(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-				if (err) {
+			} else if (module_lifecycle_is_running(&ctx.lc)) {
-					LOG_WRN("bt_bas_set_battery_level failed (%d)", err);
+				(void)bas_update_level();
 			}
-			}
-
-			module_set_state(MODULE_STATE_READY);
 			return false;
 		}
 

src/ble_hid_module.c

@@ -18,6 +18,7 @@
 #include "hid_report_sent_event.h"
 #include "hid_tx_report_event.h"
 #include "keyboard_core.h"
+#include "module_lifecycle.h"
 #include "set_protocol_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
@@ -40,15 +41,40 @@ BT_HIDS_DEF(hids_obj,
 	    KEYBOARD_CONSUMER_REPORT_SIZE,
 	    BLE_HID_KEYS_LED_REPORT_SIZE);
 
-static struct bt_conn *active_conn;
+struct ble_hid_module_ctx {
-static struct in_flight_report in_flight;
+	struct module_lifecycle_ctx lc;
-static enum keyboard_protocol_mode protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
+	struct bt_conn *active_conn;
-static bool initialized;
+	struct in_flight_report in_flight;
-static bool running;
+	enum keyboard_protocol_mode protocol_mode;
-static bool secured;
+	bool secured;
-static bool keyboard_report_notify_enabled;
+	bool keyboard_report_notify_enabled;
-static bool consumer_report_notify_enabled;
+	bool consumer_report_notify_enabled;
-static bool boot_keyboard_notify_enabled;
+	bool boot_keyboard_notify_enabled;
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct ble_hid_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT,
+};
 
 static const uint8_t hid_report_desc[] = {
 	0x05, 0x01,             /* Usage Page (Generic Desktop) */
@@ -100,24 +126,25 @@ static const uint8_t hid_report_desc[] = {
 
 static void submit_ble_transport_state_event(void)
 {
-	bool ready = running && secured && (active_conn != NULL);
+	bool ready = module_lifecycle_is_running(&ctx.lc) &&
+		     ctx.secured && (ctx.active_conn != NULL);
 	uint8_t report_ready_bm = 0U;
 
-	if (ready && ((protocol_mode == KEYBOARD_PROTOCOL_MODE_BOOT) ?
+	if (ready && ((ctx.protocol_mode == KEYBOARD_PROTOCOL_MODE_BOOT) ?
-			      boot_keyboard_notify_enabled :
+			      ctx.boot_keyboard_notify_enabled :
-			      keyboard_report_notify_enabled)) {
+			      ctx.keyboard_report_notify_enabled)) {
 		report_ready_bm |= BIT(KEYBOARD_REPORT_TYPE_KEYS);
 	}
 
-	if (ready && (protocol_mode == KEYBOARD_PROTOCOL_MODE_REPORT) &&
+	if (ready && (ctx.protocol_mode == KEYBOARD_PROTOCOL_MODE_REPORT) &&
-	    consumer_report_notify_enabled) {
+	    ctx.consumer_report_notify_enabled) {
 		report_ready_bm |= BIT(KEYBOARD_REPORT_TYPE_CONSUMER);
 	}
 
 	submit_hid_channel_state_event(
 		HID_SEND_CH_BLE_SHARED,
 		report_ready_bm,
-		protocol_mode);
+		ctx.protocol_mode);
 }
 
 static void input_report_notify_handler(uint8_t report_id, enum bt_hids_notify_evt evt)
@@ -125,9 +152,9 @@ static void input_report_notify_handler(uint8_t report_id, enum bt_hids_notify_e
 	bool enabled = (evt == BT_HIDS_CCCD_EVT_NOTIFY_ENABLED);
 
 	if (report_id == BLE_HID_KEYS_REPORT_ID) {
-		keyboard_report_notify_enabled = enabled;
+		ctx.keyboard_report_notify_enabled = enabled;
 	} else if (report_id == BLE_HID_CONSUMER_REPORT_ID) {
-		consumer_report_notify_enabled = enabled;
+		ctx.consumer_report_notify_enabled = enabled;
 	}
 
 	submit_ble_transport_state_event();
@@ -135,7 +162,7 @@ static void input_report_notify_handler(uint8_t report_id, enum bt_hids_notify_e
 
 static void boot_keyboard_notify_handler(enum bt_hids_notify_evt evt)
 {
-	boot_keyboard_notify_enabled = (evt == BT_HIDS_CCCD_EVT_NOTIFY_ENABLED);
+	ctx.boot_keyboard_notify_enabled = (evt == BT_HIDS_CCCD_EVT_NOTIFY_ENABLED);
 	submit_ble_transport_state_event();
 }
 
@@ -144,14 +171,14 @@ static void hid_report_complete_cb(struct bt_conn *conn, void *user_data)
 	ARG_UNUSED(conn);
 	ARG_UNUSED(user_data);
 
-	if (!in_flight.active) {
+	if (!ctx.in_flight.active) {
 		return;
 	}
 
 	submit_hid_report_sent_event(HID_SEND_CH_BLE_SHARED,
-				     in_flight.report_type,
+				     ctx.in_flight.report_type,
-				     in_flight.sequence, false);
+				     ctx.in_flight.sequence, false);
-	in_flight.active = false;
+	ctx.in_flight.active = false;
 }
 
 static void keyboard_led_report_common(struct bt_hids_rep *rep, bool write)
@@ -187,22 +214,22 @@ static void pm_evt_handler(enum bt_hids_pm_evt evt, struct bt_conn *conn)
 
 	switch (evt) {
 	case BT_HIDS_PM_EVT_BOOT_MODE_ENTERED:
-		protocol_mode = KEYBOARD_PROTOCOL_MODE_BOOT;
+		ctx.protocol_mode = KEYBOARD_PROTOCOL_MODE_BOOT;
 		break;
 
 	case BT_HIDS_PM_EVT_REPORT_MODE_ENTERED:
-		protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
+		ctx.protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
 		break;
 
 	default:
 		return;
 	}
 
-	submit_set_protocol_event(HID_TRANSPORT_BLE, protocol_mode);
+	submit_set_protocol_event(HID_TRANSPORT_BLE, ctx.protocol_mode);
 	submit_ble_transport_state_event();
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	struct bt_hids_init_param hids_init_param = { 0 };
 	struct bt_hids_inp_rep *input_report;
@@ -239,38 +266,38 @@ static int module_init(void)
 	return bt_hids_init(&hids_obj, &hids_init_param);
 }
 
-static int module_start(void)
+static int do_start(void)
 {
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
 	submit_ble_transport_state_event();
 
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	in_flight.active = false;
+	ctx.in_flight.active = false;
-	running = false;
 	submit_ble_transport_state_event();
+
+	return 0;
 }
 
 static void reset_connection_state(void)
 {
-	active_conn = NULL;
+	ctx.active_conn = NULL;
-	secured = false;
+	ctx.secured = false;
-	keyboard_report_notify_enabled = false;
+	ctx.keyboard_report_notify_enabled = false;
-	consumer_report_notify_enabled = false;
+	ctx.consumer_report_notify_enabled = false;
-	boot_keyboard_notify_enabled = false;
+	ctx.boot_keyboard_notify_enabled = false;
-	protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
+	ctx.protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
-	in_flight.active = false;
+	ctx.in_flight.active = false;
 }
 
 static bool handle_ble_peer_event(const struct ble_peer_event *event)
@@ -279,13 +306,13 @@ static bool handle_ble_peer_event(const struct ble_peer_event *event)
 
 	switch (event->state) {
 	case PEER_STATE_CONNECTED:
-		if (active_conn != NULL) {
+		if (ctx.active_conn != NULL) {
 			return false;
 		}
 
-		active_conn = event->id;
+		ctx.active_conn = event->id;
-		protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
+		ctx.protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
-		submit_set_protocol_event(HID_TRANSPORT_BLE, protocol_mode);
+		submit_set_protocol_event(HID_TRANSPORT_BLE, ctx.protocol_mode);
 		err = bt_hids_connected(&hids_obj, event->id);
 		if (err) {
 			LOG_ERR("bt_hids_connected failed (%d)", err);
@@ -294,16 +321,16 @@ static bool handle_ble_peer_event(const struct ble_peer_event *event)
 		return false;
 
 	case PEER_STATE_SECURED:
-		if (active_conn != event->id) {
+		if (ctx.active_conn != event->id) {
 			return false;
 		}
 
-		secured = true;
+		ctx.secured = true;
 		submit_ble_transport_state_event();
 		return false;
 
 	case PEER_STATE_DISCONNECTED:
-		if (active_conn != event->id) {
+		if (ctx.active_conn != event->id) {
 			return false;
 		}
 
@@ -325,34 +352,35 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 {
 	int err;
 
-	if (!running || (event->channel != HID_SEND_CH_BLE_SHARED) ||
+	if (!module_lifecycle_is_running(&ctx.lc) ||
-	    in_flight.active) {
+	    (event->channel != HID_SEND_CH_BLE_SHARED) ||
+	    ctx.in_flight.active) {
 		return false;
 	}
 
-	if ((active_conn == NULL) || !secured) {
+	if ((ctx.active_conn == NULL) || !ctx.secured) {
 		return false;
 	}
 
 	if (event->report_type == KEYBOARD_REPORT_TYPE_KEYS) {
-		if (event->protocol_mode != protocol_mode) {
+		if (event->protocol_mode != ctx.protocol_mode) {
 			LOG_WRN("Drop BLE keys report due to protocol mismatch");
 			return false;
 		}
 
-		in_flight.active = true;
+		ctx.in_flight.active = true;
-		in_flight.report_type = event->report_type;
+		ctx.in_flight.report_type = event->report_type;
-		in_flight.sequence = event->sequence;
+		ctx.in_flight.sequence = event->sequence;
 
-		if (protocol_mode == KEYBOARD_PROTOCOL_MODE_BOOT) {
+		if (ctx.protocol_mode == KEYBOARD_PROTOCOL_MODE_BOOT) {
 			err = bt_hids_boot_kb_inp_rep_send(&hids_obj,
-							 active_conn,
+							 ctx.active_conn,
 							 event->dyndata.data,
 							 (uint8_t)event->dyndata.size,
 							 hid_report_complete_cb);
 		} else {
 			err = bt_hids_inp_rep_send(&hids_obj,
-						    active_conn,
+						    ctx.active_conn,
 						    BLE_HID_KEYS_REPORT_IDX,
 						    event->dyndata.data,
 						    (uint8_t)event->dyndata.size,
@@ -360,7 +388,7 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 		}
 
 		if (err) {
-			in_flight.active = false;
+			ctx.in_flight.active = false;
 			LOG_WRN("BLE keyboard report submit failed (%d)", err);
 			submit_hid_report_sent_event(HID_SEND_CH_BLE_SHARED,
 						     KEYBOARD_REPORT_TYPE_KEYS,
@@ -371,23 +399,23 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 	}
 
 	if (event->report_type == KEYBOARD_REPORT_TYPE_CONSUMER) {
-		if (protocol_mode != KEYBOARD_PROTOCOL_MODE_REPORT) {
+		if (ctx.protocol_mode != KEYBOARD_PROTOCOL_MODE_REPORT) {
 			LOG_WRN("Drop BLE consumer report in boot mode");
 			return false;
 		}
 
-		in_flight.active = true;
+		ctx.in_flight.active = true;
-		in_flight.report_type = event->report_type;
+		ctx.in_flight.report_type = event->report_type;
-		in_flight.sequence = event->sequence;
+		ctx.in_flight.sequence = event->sequence;
 
 		err = bt_hids_inp_rep_send(&hids_obj,
-					    active_conn,
+					    ctx.active_conn,
 					    BLE_HID_CONSUMER_REPORT_IDX,
 					    event->dyndata.data,
 					    (uint8_t)event->dyndata.size,
 					    hid_report_complete_cb);
 		if (err) {
-			in_flight.active = false;
+			ctx.in_flight.active = false;
 			LOG_WRN("BLE consumer report submit failed (%d)", err);
 			submit_hid_report_sent_event(HID_SEND_CH_BLE_SHARED,
 						     KEYBOARD_REPORT_TYPE_CONSUMER,
@@ -410,48 +438,25 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/ble_nus_module.c

@@ -13,6 +13,7 @@
 #include <zephyr/bluetooth/services/nus.h>
 #include <zephyr/logging/log.h>
 
+#include "module_lifecycle.h"
 #include "proto_rx_event.h"
 #include "proto_transport_state_event.h"
 #include "proto_tx_event.h"
@@ -27,20 +28,39 @@ enum ble_nus_business_state {
 };
 
 struct ble_nus_ctx {
-	enum module_state lifecycle;
+	struct module_lifecycle_ctx lc;
 	enum ble_nus_business_state business;
 	struct bt_conn *active_conn;
 };
 
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
 static struct ble_nus_ctx ctx = {
-	.lifecycle = MODULE_STATE_OFF,
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
 	.business = BLE_NUS_STACK_OFFLINE,
 	.active_conn = NULL,
 };
 
 static bool lifecycle_is_ready(void)
 {
-	return ctx.lifecycle == MODULE_STATE_READY;
+	return module_lifecycle_is_running(&ctx.lc);
 }
 
 static enum proto_transport_link_state transport_link_state_get(void)
@@ -51,11 +71,11 @@ static enum proto_transport_link_state transport_link_state_get(void)
 		       PROTO_TRANSPORT_LINK_DOWN;
 }
 
-static void state_reconcile(enum module_state old_lifecycle,
+static void state_reconcile(enum module_lifecycle old_lifecycle,
 			    enum ble_nus_business_state old_business)
 {
 	enum proto_transport_link_state old_link =
-		((old_lifecycle == MODULE_STATE_READY) &&
+		((old_lifecycle == LC_RUNNING) &&
 		 (old_business == BLE_NUS_SESSION_READY)) ?
 			PROTO_TRANSPORT_LINK_READY :
 			PROTO_TRANSPORT_LINK_DOWN;
@@ -67,23 +87,9 @@ static void state_reconcile(enum module_state old_lifecycle,
 	}
 }
 
-static void lifecycle_set(enum module_state new_state)
-{
-	enum module_state old_lifecycle = ctx.lifecycle;
-	enum ble_nus_business_state old_business = ctx.business;
-
-	if (ctx.lifecycle == new_state) {
-		return;
-	}
-
-	ctx.lifecycle = new_state;
-	state_reconcile(old_lifecycle, old_business);
-	module_set_state(new_state);
-}
-
 static void business_state_set(enum ble_nus_business_state new_state)
 {
-	enum module_state old_lifecycle = ctx.lifecycle;
+	enum module_lifecycle old_lifecycle = ctx.lc.state;
 	enum ble_nus_business_state old_business = ctx.business;
 
 	if (ctx.business == new_state) {
@@ -150,7 +156,7 @@ static void reset_connection_state(void)
 	}
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	int err;
 
@@ -160,23 +166,33 @@ static int module_init(void)
 		return err;
 	}
 
-	ctx = (struct ble_nus_ctx) {
+	ctx.business = BLE_NUS_STACK_OFFLINE;
-		.lifecycle = MODULE_STATE_OFF,
+	ctx.active_conn = NULL;
-		.business = BLE_NUS_STACK_OFFLINE,
-		.active_conn = NULL,
-	};
 
 	return 0;
 }
 
-static void module_start(void)
+static int do_start(void)
 {
-	lifecycle_set(MODULE_STATE_READY);
+	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	lifecycle_set(MODULE_STATE_STANDBY);
+	return 0;
+}
+
+static int apply_lifecycle(enum module_lifecycle target)
+{
+	enum module_lifecycle old_lifecycle = ctx.lc.state;
+	enum ble_nus_business_state old_business = ctx.business;
+	int err = module_set_lifecycle(&ctx.lc, target);
+
+	if (!err) {
+		state_reconcile(old_lifecycle, old_business);
+	}
+
+	return err;
 }
 
 static bool handle_ble_peer_event(const struct ble_peer_event *event)
@@ -243,27 +259,13 @@ static bool app_event_handler(const struct app_event_header *aeh)
 			cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (ctx.lifecycle == MODULE_STATE_OFF) {
+			(void)apply_lifecycle(LC_RUNNING);
-				int err = module_init();
-
-				if (err) {
-					lifecycle_set(MODULE_STATE_ERROR);
-					return false;
-				}
-			}
-
-			module_start();
-
 			return false;
 		}
 
 		if (check_state(event, MODULE_ID(ble_state), MODULE_STATE_READY)) {
 			business_state_set_stack_ready();
 
-			if (lifecycle_is_ready()) {
-				lifecycle_set(MODULE_STATE_READY);
-			}
-
 			return false;
 		}
 
@@ -271,16 +273,16 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (ctx.lifecycle != MODULE_STATE_OFF) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)apply_lifecycle(LC_STOPPED);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (ctx.lifecycle != MODULE_STATE_OFF) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_start();
+			(void)apply_lifecycle(LC_RUNNING);
 		}
 
 		return false;

src/display_module.c

@@ -16,6 +16,7 @@
 #include "bat_state_event.h"
 #include "datetime_event.h"
 #include "hid_led_event.h"
+#include "module_lifecycle.h"
 #include "mode_switch_event.h"
 #include "theme_rgb_update_event.h"
 #include "theme_color.h"
@@ -27,46 +28,74 @@ BUILD_ASSERT(DT_HAS_CHOSEN(zephyr_display), "Missing zephyr,display chosen node"
 BUILD_ASSERT(DT_NODE_HAS_STATUS(DT_ALIAS(backlight), okay),
 	     "Missing backlight alias");
 
-static const struct device *const display_dev =
+struct display_module_ctx {
-	DEVICE_DT_GET(DT_CHOSEN(zephyr_display));
+	struct module_lifecycle_ctx lc;
-static const struct device *const backlight_dev =
+	const struct device *display_dev;
-	DEVICE_DT_GET(DT_PARENT(DT_ALIAS(backlight)));
+	const struct device *backlight_dev;
-static const uint32_t backlight_idx = DT_NODE_CHILD_IDX(DT_ALIAS(backlight));
+	uint32_t backlight_idx;
-static struct ui_main_model ui_model = {
+	struct ui_main_model ui_model;
+	bool lvgl_initialized;
+	char date_text[DATETIME_EVENT_DATE_TEXT_LEN];
+	char time_text[DATETIME_EVENT_TIME_TEXT_LEN];
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct display_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.display_dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_display)),
+	.backlight_dev = DEVICE_DT_GET(DT_PARENT(DT_ALIAS(backlight))),
+	.backlight_idx = DT_NODE_CHILD_IDX(DT_ALIAS(backlight)),
+	.ui_model = {
 		.theme_color = LV_COLOR_MAKE(BLINKY_THEME_DEFAULT_R,
 					     BLINKY_THEME_DEFAULT_G,
 					     BLINKY_THEME_DEFAULT_B),
 		.inactive_border_color = LV_COLOR_MAKE(0x3A, 0x44, 0x52),
 		.mode = MODE_SWITCH_BLE,
+	},
+	.date_text = "1970/01/01",
+	.time_text = "00:00:00",
 };
-static bool initialized;
-static bool running;
-static bool lvgl_initialized;
-static char date_text[DATETIME_EVENT_DATE_TEXT_LEN] = "1970/01/01";
-static char time_text[DATETIME_EVENT_TIME_TEXT_LEN] = "00:00:00";
 
 static int backlight_set(bool on)
 {
 	if (on) {
-		return led_on(backlight_dev, backlight_idx);
+		return led_on(ctx.backlight_dev, ctx.backlight_idx);
 	}
 
-	return led_off(backlight_dev, backlight_idx);
+	return led_off(ctx.backlight_dev, ctx.backlight_idx);
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	int err;
 
-	LOG_INF("Display init on %s", display_dev->name);
+	LOG_INF("Display init on %s", ctx.display_dev->name);
 
-	if (!device_is_ready(display_dev)) {
+	if (!device_is_ready(ctx.display_dev)) {
-		LOG_ERR("Display device %s not ready", display_dev->name);
+		LOG_ERR("Display device %s not ready", ctx.display_dev->name);
 		return -ENODEV;
 	}
 
-	if (!device_is_ready(backlight_dev)) {
+	if (!device_is_ready(ctx.backlight_dev)) {
-		LOG_ERR("Backlight device %s not ready", backlight_dev->name);
+		LOG_ERR("Backlight device %s not ready", ctx.backlight_dev->name);
 		return -ENODEV;
 	}
 
@@ -79,25 +108,25 @@ static int module_init(void)
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
 	int err;
 
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	if (!lvgl_initialized) {
+	if (!ctx.lvgl_initialized) {
 		err = lvgl_init();
 		if (err) {
 			LOG_ERR("lvgl_init failed (%d)", err);
 			return err;
 		}
 
-		lvgl_initialized = true;
+		ctx.lvgl_initialized = true;
 
 		lvgl_lock();
-		ui_main_init(&ui_model, date_text, time_text);
+		ui_main_init(&ctx.ui_model, ctx.date_text, ctx.time_text);
 		lvgl_unlock();
 	}
 
@@ -107,39 +136,39 @@ static int module_start(void)
 		return err;
 	}
 
-	err = display_blanking_off(display_dev);
+	err = display_blanking_off(ctx.display_dev);
 	if (err) {
 		LOG_ERR("display_blanking_off failed (%d)", err);
 		(void)backlight_set(false);
 		return err;
 	}
 
-	running = true;
 	LOG_INF("LVGL display started");
 
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	(void)display_blanking_on(display_dev);
+	(void)display_blanking_on(ctx.display_dev);
 	(void)backlight_set(false);
-	running = false;
 	LOG_INF("LVGL display paused");
+
+	return 0;
 }
 
 static void refresh_ui(void)
 {
-	if (!lvgl_initialized) {
+	if (!ctx.lvgl_initialized) {
 		return;
 	}
 
 	lvgl_lock();
-	ui_main_refresh_all(&ui_model, date_text, time_text);
+	ui_main_refresh_all(&ctx.ui_model, ctx.date_text, ctx.time_text);
 	lvgl_unlock();
 }
 
@@ -148,9 +177,9 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	if (is_bat_state_event(aeh)) {
 		const struct bat_state_event *event = cast_bat_state_event(aeh);
 
-		ui_model.battery_level = event->soc;
+		ctx.ui_model.battery_level = event->soc;
-		ui_model.charging = event->charging;
+		ctx.ui_model.charging = event->charging;
-		ui_model.full = event->full;
+		ctx.ui_model.full = event->full;
 		refresh_ui();
 		return false;
 	}
@@ -158,7 +187,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	if (is_mode_switch_event(aeh)) {
 		const struct mode_switch_event *event = cast_mode_switch_event(aeh);
 
-		ui_model.mode = event->mode;
+		ctx.ui_model.mode = event->mode;
 		refresh_ui();
 		return false;
 	}
@@ -166,7 +195,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	if (is_hid_led_event(aeh)) {
 		const struct hid_led_event *event = cast_hid_led_event(aeh);
 
-		ui_model.led_mask = event->led_bm;
+		ctx.ui_model.led_mask = event->led_bm;
 		refresh_ui();
 		return false;
 	}
@@ -175,7 +204,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		const struct theme_rgb_update_event *event =
 			cast_theme_rgb_update_event(aeh);
 
-		ui_model.theme_color = (lv_color_t)LV_COLOR_MAKE(event->theme.r,
+		ctx.ui_model.theme_color = (lv_color_t)LV_COLOR_MAKE(event->theme.r,
 								     event->theme.g,
 								     event->theme.b);
 		refresh_ui();
@@ -185,58 +214,35 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	if (is_datetime_event(aeh)) {
 		const struct datetime_event *event = cast_datetime_event(aeh);
 
-		strncpy(date_text, event->date_text, sizeof(date_text));
+		strncpy(ctx.date_text, event->date_text, sizeof(ctx.date_text));
-		date_text[sizeof(date_text) - 1] = '\0';
+		ctx.date_text[sizeof(ctx.date_text) - 1] = '\0';
-		strncpy(time_text, event->time_text, sizeof(time_text));
+		strncpy(ctx.time_text, event->time_text, sizeof(ctx.time_text));
-		time_text[sizeof(time_text) - 1] = '\0';
+		ctx.time_text[sizeof(ctx.time_text) - 1] = '\0';
 		refresh_ui();
 		return false;
 	}
 
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/encoder_module.c

@@ -13,6 +13,7 @@
 #include <zephyr/pm/device.h>
 
 #include "encoder_event.h"
+#include "module_lifecycle.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
@@ -22,17 +23,41 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
 BUILD_ASSERT(DT_NODE_EXISTS(ENCODER_QDEC_NODE), "Missing qdec0 alias");
 
-static const struct device *const qdec_dev = DEVICE_DT_GET(ENCODER_QDEC_NODE);
+struct encoder_module_ctx {
-
+	struct module_lifecycle_ctx lc;
-static struct k_work encoder_report_work;
+	const struct device *qdec_dev;
-static struct sensor_trigger encoder_trigger = {
+	struct k_work encoder_report_work;
-	.type = SENSOR_TRIG_DATA_READY,
+	struct sensor_trigger encoder_trigger;
-	.chan = SENSOR_CHAN_ROTATION,
+	int64_t angle_remainder_udeg;
 };
 
-static bool initialized;
+static int do_init(void);
-static bool running;
+static int do_start(void);
-static int64_t angle_remainder_udeg;
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct encoder_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.qdec_dev = DEVICE_DT_GET(ENCODER_QDEC_NODE),
+	.encoder_trigger = {
+		.type = SENSOR_TRIG_DATA_READY,
+		.chan = SENSOR_CHAN_ROTATION,
+	},
+};
 
 static int64_t sensor_value_to_udeg(const struct sensor_value *value)
 {
@@ -68,25 +93,26 @@ static void encoder_report_work_handler(struct k_work *work)
 
 	ARG_UNUSED(work);
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return;
 	}
 
-	err = sensor_sample_fetch(qdec_dev);
+	err = sensor_sample_fetch(ctx.qdec_dev);
 	if (err) {
 		LOG_WRN("QDEC sample fetch failed (%d)", err);
 		return;
 	}
 
-	err = sensor_channel_get(qdec_dev, SENSOR_CHAN_ROTATION, &rotation);
+	err = sensor_channel_get(ctx.qdec_dev, SENSOR_CHAN_ROTATION, &rotation);
 	if (err) {
 		LOG_WRN("QDEC channel get failed (%d)", err);
 		return;
 	}
 
-	total_udeg = angle_remainder_udeg + sensor_value_to_udeg(&rotation);
+	total_udeg = ctx.angle_remainder_udeg + sensor_value_to_udeg(&rotation);
 	detents = (int32_t)(total_udeg / ENCODER_DETENT_UDEG);
-	angle_remainder_udeg = total_udeg - ((int64_t)detents * ENCODER_DETENT_UDEG);
+	ctx.angle_remainder_udeg =
+		total_udeg - ((int64_t)detents * ENCODER_DETENT_UDEG);
 
 	if (detents != 0) {
 		submit_detents_batched(detents);
@@ -99,26 +125,27 @@ static void encoder_trigger_handler(const struct device *dev,
 	ARG_UNUSED(dev);
 	ARG_UNUSED(trigger);
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return;
 	}
 
-	k_work_submit(&encoder_report_work);
+	k_work_submit(&ctx.encoder_report_work);
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	int err;
 
-	if (!device_is_ready(qdec_dev)) {
+	if (!device_is_ready(ctx.qdec_dev)) {
 		LOG_ERR("QDEC device not ready");
 		return -ENODEV;
 	}
 
-	k_work_init(&encoder_report_work, encoder_report_work_handler);
+	k_work_init(&ctx.encoder_report_work, encoder_report_work_handler);
-	angle_remainder_udeg = 0;
+	ctx.angle_remainder_udeg = 0;
 
-	err = sensor_trigger_set(qdec_dev, &encoder_trigger, encoder_trigger_handler);
+	err = sensor_trigger_set(ctx.qdec_dev, &ctx.encoder_trigger,
+				 encoder_trigger_handler);
 	if (err) {
 		LOG_ERR("Cannot set QDEC trigger (%d)", err);
 		return err;
@@ -127,41 +154,41 @@ static int module_init(void)
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
 	int err;
 
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	err = pm_device_action_run(qdec_dev, PM_DEVICE_ACTION_RESUME);
+	err = pm_device_action_run(ctx.qdec_dev, PM_DEVICE_ACTION_RESUME);
 	if (err && (err != -EALREADY) && (err != -ENOTSUP)) {
 		LOG_ERR("Cannot resume QDEC device (%d)", err);
 		return err;
 	}
 
-	angle_remainder_udeg = 0;
+	ctx.angle_remainder_udeg = 0;
-	running = true;
 
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
 	int err;
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	err = pm_device_action_run(qdec_dev, PM_DEVICE_ACTION_SUSPEND);
+	err = pm_device_action_run(ctx.qdec_dev, PM_DEVICE_ACTION_SUSPEND);
 	if (err && (err != -EALREADY) && (err != -ENOTSUP)) {
 		LOG_WRN("Cannot suspend QDEC device (%d)", err);
 	}
 
-	angle_remainder_udeg = 0;
+	ctx.angle_remainder_udeg = 0;
-	running = false;
+
+	return 0;
 }
 
 static bool app_event_handler(const struct app_event_header *aeh)
@@ -170,47 +197,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		const struct module_state_event *event = cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/hid_flowctrl_module.c

@@ -15,6 +15,7 @@
 #include "hid_tx_report_event.h"
 #include "keyboard_core.h"
 #include "keyboard_hid_report_event.h"
+#include "module_lifecycle.h"
 #include "mode_switch_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
@@ -49,7 +50,42 @@ struct in_flight_report {
 	uint16_t sequence;
 };
 
-static struct hid_channel_state_data channel_state[HID_SEND_CH_COUNT] = {
+struct hid_flowctrl_module_ctx {
+	struct module_lifecycle_ctx lc;
+	struct hid_channel_state_data channel_state[HID_SEND_CH_COUNT];
+	struct pending_report pending_keys;
+	struct pending_report pending_consumer_latest;
+	struct queued_report consumer_fifo[HID_FLOWCTRL_FIFO_DEPTH];
+	uint8_t consumer_fifo_head;
+	uint8_t consumer_fifo_tail;
+	uint8_t consumer_fifo_count;
+	struct in_flight_report in_flight[HID_SEND_CH_COUNT];
+	enum mode_switch_mode current_mode;
+	uint16_t next_sequence;
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct hid_flowctrl_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.channel_state = {
 		[HID_SEND_CH_USB_KEYS] = {
 			.protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT,
 		},
@@ -59,18 +95,21 @@ static struct hid_channel_state_data channel_state[HID_SEND_CH_COUNT] = {
 		[HID_SEND_CH_BLE_SHARED] = {
 			.protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT,
 		},
+	},
 };
-static struct pending_report pending_keys;
+
-static struct pending_report pending_consumer_latest;
+#define lifecycle ctx.lc
-static struct queued_report consumer_fifo[HID_FLOWCTRL_FIFO_DEPTH];
+#define channel_state ctx.channel_state
-static uint8_t consumer_fifo_head;
+#define pending_keys ctx.pending_keys
-static uint8_t consumer_fifo_tail;
+#define pending_consumer_latest ctx.pending_consumer_latest
-static uint8_t consumer_fifo_count;
+#define consumer_fifo ctx.consumer_fifo
-static struct in_flight_report in_flight[HID_SEND_CH_COUNT];
+#define consumer_fifo_head ctx.consumer_fifo_head
-static enum mode_switch_mode current_mode;
+#define consumer_fifo_tail ctx.consumer_fifo_tail
-static uint16_t next_sequence;
+#define consumer_fifo_count ctx.consumer_fifo_count
-static bool initialized;
+#define in_flight ctx.in_flight
-static bool running;
+#define current_mode ctx.current_mode
+#define next_sequence ctx.next_sequence
+#define running module_lifecycle_is_running(&ctx.lc)
 
 static bool current_mode_to_channel(enum keyboard_report_type report_type,
 				    enum hid_send_channel *channel)
@@ -359,7 +398,7 @@ static bool handle_mode_switch_event(const struct mode_switch_event *event)
 	return false;
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	clear_pending_reports();
 	current_mode = MODE_SWITCH_USB;
@@ -374,25 +413,25 @@ static int module_init(void)
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
 	if (running) {
 		return 0;
 	}
 
-	running = true;
 	try_send_next();
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
 	if (!running) {
-		return;
+		return 0;
 	}
 
 	clear_pending_reports();
-	running = false;
+
+	return 0;
 }
 
 static bool app_event_handler(const struct app_event_header *aeh)
@@ -421,47 +460,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 			cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
+			(void)module_set_lifecycle(&lifecycle, LC_RUNNING);
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&lifecycle)) {
-			module_pause();
+			(void)module_set_lifecycle(&lifecycle, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&lifecycle)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&lifecycle, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/keyboard_core_module.c

@@ -19,6 +19,7 @@
 #include "function_bitmap_update_event.h"
 #include "keyboard_core.h"
 #include "keyboard_hid_report_event.h"
+#include "module_lifecycle.h"
 #include "mode_switch_event.h"
 #include "set_protocol_event.h"
 
@@ -85,17 +86,51 @@ static const uint16_t consumer_usage_map[KEYBOARD_CONSUMER_CTRL_COUNT] = {
 	[KEYBOARD_CONSUMER_CTRL_PREV_TRACK] = 0x00B6,
 };
 
-static struct keyboard_state keyboard_state;
+struct keyboard_core_module_ctx {
-static struct keyboard_reports_cache reports_cache;
+	struct module_lifecycle_ctx lc;
-static uint8_t function_usage_mask[KEYBOARD_PROTOCOL_BITMAP_BYTES];
+	struct keyboard_state keyboard_state;
-static enum keyboard_protocol_mode transport_protocol_modes[HID_TRANSPORT_COUNT] = {
+	struct keyboard_reports_cache reports_cache;
+	uint8_t function_usage_mask[KEYBOARD_PROTOCOL_BITMAP_BYTES];
+	enum keyboard_protocol_mode transport_protocol_modes[HID_TRANSPORT_COUNT];
+	enum mode_switch_mode current_mode;
+	bool mode_valid;
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct keyboard_core_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.transport_protocol_modes = {
 		[HID_TRANSPORT_USB] = KEYBOARD_PROTOCOL_MODE_REPORT,
 		[HID_TRANSPORT_BLE] = KEYBOARD_PROTOCOL_MODE_REPORT,
+	},
 };
-static enum mode_switch_mode current_mode;
+
-static bool initialized;
+#define lifecycle ctx.lc
-static bool running;
+#define keyboard_state ctx.keyboard_state
-static bool mode_valid;
+#define reports_cache ctx.reports_cache
+#define function_usage_mask ctx.function_usage_mask
+#define transport_protocol_modes ctx.transport_protocol_modes
+#define current_mode ctx.current_mode
+#define mode_valid ctx.mode_valid
+#define running module_lifecycle_is_running(&ctx.lc)
 
 static bool mode_to_transport(enum mode_switch_mode mode, enum hid_transport *transport)
 {
@@ -440,7 +475,7 @@ static void emit_release_reports(enum mode_switch_mode mode)
 	}
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	keyboard_state_clear();
 	reports_cache_invalidate();
@@ -454,20 +489,19 @@ static int module_init(void)
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
 	if (running) {
 		return 0;
 	}
 
-	running = true;
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
 	if (!running) {
-		return;
+		return 0;
 	}
 
 	if (mode_valid) {
@@ -478,7 +512,8 @@ static void module_pause(void)
 	keyboard_state_clear();
 	reports_cache_invalidate();
 	mode_valid = false;
-	running = false;
+
+	return 0;
 }
 
 static bool handle_button_event(const struct button_event *event)
@@ -630,47 +665,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		const struct module_state_event *event = cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
+			(void)module_set_lifecycle(&lifecycle, LC_RUNNING);
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&lifecycle)) {
-			module_pause();
+			(void)module_set_lifecycle(&lifecycle, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&lifecycle)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&lifecycle, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/led_strip_module.c

@@ -18,6 +18,7 @@
 
 #include "led_effect/led_effect.h"
 #include "led_strip_en_event.h"
+#include "module_lifecycle.h"
 #include "theme_rgb_update_event.h"
 #include "theme_color.h"
 
@@ -34,9 +35,16 @@ BUILD_ASSERT(DT_NODE_HAS_PROP(LED_STRIP_NODE, supply_gpios),
 BUILD_ASSERT(LED_STRIP_NUM_PIXELS == 17U,
 	     "LED strip key map expects 17 pixels");
 
-static const struct device *const strip = DEVICE_DT_GET(LED_STRIP_NODE);
+struct led_strip_module_ctx {
-static const struct gpio_dt_spec strip_en =
+	struct module_lifecycle_ctx lc;
-	GPIO_DT_SPEC_GET(LED_STRIP_NODE, supply_gpios);
+	const struct device *strip;
+	struct gpio_dt_spec strip_en;
+	struct led_rgb pixels[LED_STRIP_NUM_PIXELS];
+	struct k_work_delayable effect_work;
+	struct led_effect *effect;
+	struct theme_rgb current_theme;
+	bool enabled;
+};
 
 static const struct led_key_map led_key_map[] = {
 	{ KEY_ID(0, 1), 0U },
@@ -65,28 +73,47 @@ static const struct led_effect_config effect_cfg = {
 	.default_brightness = 0xFFU,
 };
 
-static struct led_rgb pixels[LED_STRIP_NUM_PIXELS];
+static int do_init(void);
-static struct k_work_delayable effect_work;
+static int do_start(void);
-static struct led_effect *effect;
+static int do_stop(void);
-static struct theme_rgb current_theme = {
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct led_strip_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.strip = DEVICE_DT_GET(LED_STRIP_NODE),
+	.strip_en = GPIO_DT_SPEC_GET(LED_STRIP_NODE, supply_gpios),
+	.current_theme = {
 		.r = BLINKY_THEME_DEFAULT_R,
 		.g = BLINKY_THEME_DEFAULT_G,
 		.b = BLINKY_THEME_DEFAULT_B,
+	},
+	.enabled = true,
 };
-static bool initialized;
-static bool running;
-static bool enabled = true;
 
 static void clear_pixels(void)
 {
-	memset(pixels, 0, sizeof(pixels));
+	memset(ctx.pixels, 0, sizeof(ctx.pixels));
 }
 
 static int submit_frame(void)
 {
 	int err;
 
-	err = led_strip_update_rgb(strip, pixels, ARRAY_SIZE(pixels));
+	err = led_strip_update_rgb(ctx.strip, ctx.pixels, ARRAY_SIZE(ctx.pixels));
 	if (err) {
 		LOG_WRN("led_strip_update_rgb failed (%d)", err);
 	}
@@ -98,7 +125,7 @@ static int set_strip_power(bool on)
 {
 	int err;
 
-	err = gpio_pin_set_dt(&strip_en, on ? 1 : 0);
+	err = gpio_pin_set_dt(&ctx.strip_en, on ? 1 : 0);
 	if (err) {
 		LOG_WRN("LED strip EN set failed (%d)", err);
 	}
@@ -114,12 +141,12 @@ static int refresh_idle_frame(void)
 
 static void stop_effect_work(void)
 {
-	k_work_cancel_delayable(&effect_work);
+	k_work_cancel_delayable(&ctx.effect_work);
 }
 
 static void schedule_effect_tick(k_timeout_t delay)
 {
-	k_work_reschedule(&effect_work, delay);
+	k_work_reschedule(&ctx.effect_work, delay);
 }
 
 static int enable_strip_output(void)
@@ -148,13 +175,15 @@ static void effect_work_handler(struct k_work *work)
 
 	ARG_UNUSED(work);
 
-	if (!running || !enabled || (effect == NULL)) {
+	if (!module_lifecycle_is_running(&ctx.lc) || !ctx.enabled ||
+	    (ctx.effect == NULL)) {
 		return;
 	}
 
-	keep_running = effect->ops->tick(effect, k_ticks_to_ms_floor32(
+	keep_running = ctx.effect->ops->tick(ctx.effect,
+					     k_ticks_to_ms_floor32(
 						     LED_STRIP_TICK_INTERVAL.ticks),
-					 pixels, ARRAY_SIZE(pixels));
+					     ctx.pixels, ARRAY_SIZE(ctx.pixels));
 	(void)submit_frame();
 
 	if (keep_running) {
@@ -162,90 +191,85 @@ static void effect_work_handler(struct k_work *work)
 	}
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	int err;
 
-	if (!device_is_ready(strip)) {
+	if (!device_is_ready(ctx.strip)) {
-		LOG_ERR("LED strip device %s not ready", strip->name);
+		LOG_ERR("LED strip device %s not ready", ctx.strip->name);
 		return -ENODEV;
 	}
 
-	if (!gpio_is_ready_dt(&strip_en)) {
+	if (!gpio_is_ready_dt(&ctx.strip_en)) {
 		LOG_ERR("LED strip supply GPIO not ready");
 		return -ENODEV;
 	}
 
-	err = gpio_pin_configure_dt(&strip_en, GPIO_OUTPUT_INACTIVE);
+	err = gpio_pin_configure_dt(&ctx.strip_en, GPIO_OUTPUT_INACTIVE);
 	if (err) {
 		LOG_ERR("Failed to configure LED strip supply GPIO (%d)", err);
 		return err;
 	}
 
-	k_work_init_delayable(&effect_work, effect_work_handler);
+	k_work_init_delayable(&ctx.effect_work, effect_work_handler);
 	clear_pixels();
 
-	effect = led_effect_get_mutable(LED_EFFECT_ID_KEY_FADE);
+	ctx.effect = led_effect_get_mutable(LED_EFFECT_ID_KEY_FADE);
-	if ((effect == NULL) || (effect->ops == NULL)) {
+	if ((ctx.effect == NULL) || (ctx.effect->ops == NULL)) {
 		LOG_ERR("LED effect not available");
 		return -ENOENT;
 	}
 
-	err = effect->ops->init(effect, &effect_cfg);
+	err = ctx.effect->ops->init(ctx.effect, &effect_cfg);
 	if (err) {
 		LOG_ERR("LED effect init failed (%d)", err);
 		return err;
 	}
 
-	effect->ops->set_theme(effect, &current_theme);
+	ctx.effect->ops->set_theme(ctx.effect, &ctx.current_theme);
 
-	LOG_INF("LED strip ready len:%u", (uint32_t)led_strip_length(strip));
+	LOG_INF("LED strip ready len:%u", (uint32_t)led_strip_length(ctx.strip));
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
 	int err;
 
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
+	if (!ctx.enabled) {
-
-	if (!enabled) {
 		return 0;
 	}
 
 	err = enable_strip_output();
-	if (err) {
-		running = false;
-	}
-
 	return err;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	if ((effect != NULL) && (effect->ops != NULL)) {
+	if ((ctx.effect != NULL) && (ctx.effect->ops != NULL)) {
-		effect->ops->reset(effect);
+		ctx.effect->ops->reset(ctx.effect);
 	}
 
 	disable_strip_output();
-	running = false;
+	return 0;
 }
 
 static bool handle_button_event(const struct button_event *event)
 {
-	if (!running || !enabled || (effect == NULL) || !event->pressed) {
+	if (!module_lifecycle_is_running(&ctx.lc) || !ctx.enabled ||
+	    (ctx.effect == NULL) || !event->pressed) {
 		return false;
 	}
 
-	effect->ops->on_key_press(effect, event->key_id);
+	ctx.effect->ops->on_key_press(ctx.effect, event->key_id);
 	schedule_effect_tick(K_NO_WAIT);
 
 	return false;
@@ -253,22 +277,23 @@ static bool handle_button_event(const struct button_event *event)
 
 static bool handle_led_strip_en_event(const struct led_strip_en_event *event)
 {
-	enabled = event->enabled;
+	ctx.enabled = event->enabled;
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return false;
 	}
 
-	if (enabled) {
+	if (ctx.enabled) {
 		int err = enable_strip_output();
 
 		if (err) {
-			module_set_state(MODULE_STATE_ERROR);
+			LOG_WRN("LED strip enable request failed (%d)", err);
+			ctx.enabled = false;
 			return false;
 		}
 	} else {
-		if ((effect != NULL) && (effect->ops != NULL)) {
+		if ((ctx.effect != NULL) && (ctx.effect->ops != NULL)) {
-			effect->ops->reset(effect);
+			ctx.effect->ops->reset(ctx.effect);
 		}
 
 		disable_strip_output();
@@ -279,13 +304,14 @@ static bool handle_led_strip_en_event(const struct led_strip_en_event *event)
 
 static bool handle_theme_rgb_update_event(const struct theme_rgb_update_event *event)
 {
-	current_theme = event->theme;
+	ctx.current_theme = event->theme;
 
-	if ((effect != NULL) && (effect->ops != NULL)) {
+	if ((ctx.effect != NULL) && (ctx.effect->ops != NULL)) {
-		effect->ops->set_theme(effect, &current_theme);
+		ctx.effect->ops->set_theme(ctx.effect, &ctx.current_theme);
 	}
 
-	if (running && enabled && (effect != NULL) && effect->ops->is_active(effect)) {
+	if (module_lifecycle_is_running(&ctx.lc) && ctx.enabled &&
+	    (ctx.effect != NULL) && ctx.effect->ops->is_active(ctx.effect)) {
 		schedule_effect_tick(K_NO_WAIT);
 	}
 
@@ -310,47 +336,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		const struct module_state_event *event = cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/mode_policy_module.c

@@ -9,14 +9,40 @@
 
 #include <zephyr/logging/log.h>
 
+#include "module_lifecycle.h"
 #include "mode_switch_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
-static bool initialized;
+struct mode_policy_module_ctx {
-static bool running;
+	struct module_lifecycle_ctx lc;
-static bool ble_adv_suspended = true;
+	bool ble_adv_suspended;
-static bool usb_enabled;
+	bool usb_enabled;
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct mode_policy_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.ble_adv_suspended = true,
+};
 
 static void broadcast_ble_adv_req(bool suspend)
 {
@@ -40,14 +66,14 @@ static void apply_mode_policy(enum mode_switch_mode mode)
 	bool should_suspend_ble_adv = (mode != MODE_SWITCH_BLE);
 	bool should_enable_usb = (mode == MODE_SWITCH_USB);
 
-	if (should_suspend_ble_adv != ble_adv_suspended) {
+	if (should_suspend_ble_adv != ctx.ble_adv_suspended) {
-		ble_adv_suspended = should_suspend_ble_adv;
+		ctx.ble_adv_suspended = should_suspend_ble_adv;
 		broadcast_ble_adv_req(should_suspend_ble_adv);
 	}
 
-	if (should_enable_usb != usb_enabled) {
+	if (should_enable_usb != ctx.usb_enabled) {
-		usb_enabled = should_enable_usb;
+		ctx.usb_enabled = should_enable_usb;
-		if (usb_enabled) {
+		if (ctx.usb_enabled) {
 			struct module_resume_req_event *event =
 				new_module_resume_req_event();
 
@@ -65,26 +91,25 @@ static void apply_mode_policy(enum mode_switch_mode mode)
 	}
 }
 
-static int module_init(void)
+static int do_init(void)
 {
-	ble_adv_suspended = true;
+	ctx.ble_adv_suspended = true;
-	usb_enabled = false;
+	ctx.usb_enabled = false;
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	running = false;
+	return 0;
 }
 
 static bool app_event_handler(const struct app_event_header *aeh)
@@ -92,7 +117,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	if (is_mode_switch_event(aeh)) {
 		const struct mode_switch_event *event = cast_mode_switch_event(aeh);
 
-		if (running) {
+		if (module_lifecycle_is_running(&ctx.lc)) {
 			apply_mode_policy(event->mode);
 		}
 
@@ -103,47 +128,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		const struct module_state_event *event = cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/mode_switch_module.c

@@ -14,6 +14,7 @@
 #include <zephyr/logging/log.h>
 #include <zephyr/pm/device.h>
 
+#include "module_lifecycle.h"
 #include "mode_switch_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
@@ -26,15 +27,38 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 BUILD_ASSERT(DT_NODE_EXISTS(MODE_SWITCH_ADC_NODE),
 	     "Missing mode_switch_adc node in devicetree");
 
-static const struct device *const mode_switch_adc_dev =
+struct mode_switch_module_ctx {
-	DEVICE_DT_GET(MODE_SWITCH_ADC_NODE);
+	struct module_lifecycle_ctx lc;
+	const struct device *mode_switch_adc_dev;
+	struct k_work_delayable mode_switch_sample_work;
+	bool force_report;
+	bool mode_valid;
+	enum mode_switch_mode last_mode;
+};
 
-static struct k_work_delayable mode_switch_sample_work;
+static int do_init(void);
-static bool initialized;
+static int do_start(void);
-static bool running;
+static int do_stop(void);
-static bool force_report;
+
-static bool mode_valid;
+static const struct module_lifecycle_cfg lifecycle_cfg = {
-static enum mode_switch_mode last_mode;
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct mode_switch_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.mode_switch_adc_dev = DEVICE_DT_GET(MODE_SWITCH_ADC_NODE),
+};
 
 static enum mode_switch_mode detect_mode(uint16_t voltage_mv)
 {
@@ -53,7 +77,7 @@ static int mode_switch_enable(bool enable)
 {
 	enum pm_device_action action = enable ? PM_DEVICE_ACTION_RESUME
 					      : PM_DEVICE_ACTION_SUSPEND;
-	int err = pm_device_action_run(mode_switch_adc_dev, action);
+	int err = pm_device_action_run(ctx.mode_switch_adc_dev, action);
 
 	if (err && (err != -EALREADY) && (err != -ENOTSUP)) {
 		LOG_ERR("Cannot %s mode switch ADC (%d)",
@@ -71,17 +95,18 @@ static void mode_switch_sample_fn(struct k_work *work)
 
 	ARG_UNUSED(work);
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return;
 	}
 
-	err = sensor_sample_fetch(mode_switch_adc_dev);
+	err = sensor_sample_fetch(ctx.mode_switch_adc_dev);
 	if (err) {
 		LOG_WRN("Mode switch ADC sample fetch failed (%d)", err);
 		goto reschedule;
 	}
 
-	err = sensor_channel_get(mode_switch_adc_dev, SENSOR_CHAN_VOLTAGE, &voltage);
+	err = sensor_channel_get(ctx.mode_switch_adc_dev, SENSOR_CHAN_VOLTAGE,
+				 &voltage);
 	if (err) {
 		LOG_WRN("Mode switch ADC channel get failed (%d)", err);
 		goto reschedule;
@@ -90,39 +115,40 @@ static void mode_switch_sample_fn(struct k_work *work)
 	uint16_t sample_mv = (uint16_t)((voltage.val1 * 1000) + (voltage.val2 / 1000));
 	enum mode_switch_mode mode = detect_mode(sample_mv);
 
-	if (force_report || !mode_valid || (mode != last_mode)) {
+	if (ctx.force_report || !ctx.mode_valid || (mode != ctx.last_mode)) {
 		submit_mode_switch_event(mode, sample_mv);
 
-		last_mode = mode;
+		ctx.last_mode = mode;
-		mode_valid = true;
+		ctx.mode_valid = true;
-		force_report = false;
+		ctx.force_report = false;
 	}
 
 reschedule:
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
-		k_work_reschedule(&mode_switch_sample_work, MODE_SWITCH_SAMPLE_INTERVAL);
+		k_work_reschedule(&ctx.mode_switch_sample_work,
+				  MODE_SWITCH_SAMPLE_INTERVAL);
 	}
 }
 
-static int module_init(void)
+static int do_init(void)
 {
-	if (!device_is_ready(mode_switch_adc_dev)) {
+	if (!device_is_ready(ctx.mode_switch_adc_dev)) {
 		LOG_ERR("Mode switch ADC device not ready");
 		return -ENODEV;
 	}
 
-	k_work_init_delayable(&mode_switch_sample_work, mode_switch_sample_fn);
+	k_work_init_delayable(&ctx.mode_switch_sample_work, mode_switch_sample_fn);
-	mode_valid = false;
+	ctx.mode_valid = false;
-	force_report = false;
+	ctx.force_report = false;
 
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
 	int err;
 
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
@@ -131,22 +157,22 @@ static int module_start(void)
 		return err;
 	}
 
-	running = true;
+	ctx.force_report = true;
-	force_report = true;
+	k_work_reschedule(&ctx.mode_switch_sample_work, K_NO_WAIT);
-	k_work_reschedule(&mode_switch_sample_work, K_NO_WAIT);
 
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	(void)k_work_cancel_delayable(&mode_switch_sample_work);
+	(void)k_work_cancel_delayable(&ctx.mode_switch_sample_work);
 	(void)mode_switch_enable(false);
-	running = false;
+
+	return 0;
 }
 
 static bool app_event_handler(const struct app_event_header *aeh)
@@ -155,47 +181,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 		const struct module_state_event *event = cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			int err;
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (!initialized) {
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/protocol_module.c

@@ -21,6 +21,7 @@
 #include "function_bitmap_state_event.h"
 #include "function_bitmap_update_event.h"
 #include "hid_led_event.h"
+#include "module_lifecycle.h"
 #include "proto_rx_event.h"
 #include "proto_transport_state_event.h"
 #include "proto_tx_event.h"
@@ -38,16 +39,41 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 #define PROTOCOL_CAPABILITY_FLAGS (BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4))
 #define PROTOCOL_MAX_MSG_LEN 128U
 
-static bool initialized;
-static bool running;
-
 enum proto_session_state {
 	PROTO_SESSION_DOWN = 0,
 	PROTO_SESSION_WAIT_HELLO,
 	PROTO_SESSION_ACTIVE,
 };
 
-static enum proto_session_state session_state[PROTO_TRANSPORT_COUNT];
+struct protocol_module_ctx {
+	struct module_lifecycle_ctx lc;
+	enum proto_session_state session_state[PROTO_TRANSPORT_COUNT];
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct protocol_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+};
+
+#define session_state ctx.session_state
 
 static int decode_body(const uint8_t *payload, size_t payload_len,
 		       CdcPacketBody *body)
@@ -157,7 +183,7 @@ static int encode_function_bitmap_state(const uint8_t *bitmap, uint8_t *payload,
 	return encode_body(&body, payload, payload_buf_size, payload_len);
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	for (size_t i = 0; i < ARRAY_SIZE(session_state); i++) {
 		session_state[i] = PROTO_SESSION_DOWN;
@@ -166,27 +192,26 @@ static int module_init(void)
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
 	for (size_t i = 0; i < ARRAY_SIZE(session_state); i++) {
 		session_state[i] = PROTO_SESSION_DOWN;
 	}
 
-	running = false;
+	return 0;
 }
 
 int protocol_module_process_message(enum proto_transport transport,
@@ -204,7 +229,7 @@ int protocol_module_process_message(enum proto_transport transport,
 		return -EINVAL;
 	}
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return -EAGAIN;
 	}
 
@@ -317,7 +342,7 @@ static bool handle_proto_rx_event(const struct proto_rx_event *event)
 	size_t rsp_payload_len = 0U;
 	int err;
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return false;
 	}
 
@@ -373,7 +398,7 @@ static bool handle_function_bitmap_state_event(
 	size_t payload_len;
 	int err;
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return false;
 	}
 
@@ -406,7 +431,7 @@ static bool handle_hid_led_event(const struct hid_led_event *event)
 	int err;
 	enum proto_transport transport;
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return false;
 	}
 
@@ -454,25 +479,9 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 
 			return false;
 		}
@@ -481,23 +490,16 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/time_sync_module.c

@@ -13,18 +13,43 @@
 #include <zephyr/sys/printk.h>
 
 #include "datetime_event.h"
+#include "module_lifecycle.h"
 #include "time_sync_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
 #define TIME_SYNC_REFRESH_PERIOD K_SECONDS(1)
 
-static struct k_work_delayable refresh_work;
+struct time_sync_module_ctx {
-static bool initialized;
+	struct module_lifecycle_ctx lc;
-static bool running;
+	struct k_work_delayable refresh_work;
-static int32_t timezone_min;
+	int32_t timezone_min;
-static uint64_t utc_ms_base;
+	uint64_t utc_ms_base;
-static int64_t uptime_ms_base;
+	int64_t uptime_ms_base;
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct time_sync_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+};
 
 static void publish_datetime_event(void)
 {
@@ -34,9 +59,9 @@ static void publish_datetime_event(void)
 	char date_text[DATETIME_EVENT_DATE_TEXT_LEN];
 	char time_text[DATETIME_EVENT_TIME_TEXT_LEN];
 
-	local_ms = (int64_t)utc_ms_base +
+	local_ms = (int64_t)ctx.utc_ms_base +
-		   (k_uptime_get() - uptime_ms_base) +
+		   (k_uptime_get() - ctx.uptime_ms_base) +
-		   ((int64_t)timezone_min * 60LL * 1000LL);
+		   ((int64_t)ctx.timezone_min * 60LL * 1000LL);
 	if (local_ms < 0) {
 		local_ms = 0;
 	}
@@ -67,43 +92,43 @@ static void refresh_work_handler(struct k_work *work)
 {
 	ARG_UNUSED(work);
 
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
 		return;
 	}
 
 	publish_datetime_event();
-	k_work_reschedule(&refresh_work, TIME_SYNC_REFRESH_PERIOD);
+	k_work_reschedule(&ctx.refresh_work, TIME_SYNC_REFRESH_PERIOD);
 }
 
-static int module_init(void)
+static int do_init(void)
 {
-	timezone_min = 0;
+	ctx.timezone_min = 0;
-	utc_ms_base = 0U;
+	ctx.utc_ms_base = 0U;
-	uptime_ms_base = k_uptime_get();
+	ctx.uptime_ms_base = k_uptime_get();
-	k_work_init_delayable(&refresh_work, refresh_work_handler);
+	k_work_init_delayable(&ctx.refresh_work, refresh_work_handler);
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
+	k_work_reschedule(&ctx.refresh_work, K_NO_WAIT);
-	k_work_reschedule(&refresh_work, K_NO_WAIT);
 
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	k_work_cancel_delayable(&refresh_work);
+	k_work_cancel_delayable(&ctx.refresh_work);
-	running = false;
+
+	return 0;
 }
 
 static bool handle_time_sync_event(const struct time_sync_event *event)
@@ -113,12 +138,12 @@ static bool handle_time_sync_event(const struct time_sync_event *event)
 		return false;
 	}
 
-	timezone_min = event->timezone_min;
+	ctx.timezone_min = event->timezone_min;
-	utc_ms_base = event->utc_ms;
+	ctx.utc_ms_base = event->utc_ms;
-	uptime_ms_base = k_uptime_get();
+	ctx.uptime_ms_base = k_uptime_get();
 
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
-		k_work_reschedule(&refresh_work, K_NO_WAIT);
+		k_work_reschedule(&ctx.refresh_work, K_NO_WAIT);
 	}
 
 	return false;
@@ -132,48 +157,25 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/usb_cdc_module.c

@@ -16,6 +16,7 @@
 #include <zephyr/sys/ring_buffer.h>
 #include <zephyr/sys/util.h>
 
+#include "module_lifecycle.h"
 #include "proto_rx_event.h"
 #include "proto_transport_state_event.h"
 #include "proto_tx_event.h"
@@ -38,33 +39,53 @@ enum usb_cdc_business_state {
 };
 
 struct usb_cdc_ctx {
-	enum module_state lifecycle;
+	struct module_lifecycle_ctx lc;
 	enum usb_cdc_business_state business;
+	const struct device *cdc_dev;
+	uint8_t rx_ring_buffer[USB_CDC_RX_RING_BUF_SIZE];
+	uint8_t tx_ring_buffer[USB_CDC_TX_RING_BUF_SIZE];
+	struct ring_buf rx_ringbuf;
+	struct ring_buf tx_ringbuf;
+	struct k_work rx_work;
+	struct k_work_delayable rx_flush_work;
+	uint8_t proto_rx_buf[USB_CDC_PROTO_RX_BUF_SIZE];
 	bool usb_active;
 	size_t proto_rx_len;
 };
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
 
-static const struct device *const cdc_dev = DEVICE_DT_GET_ONE(zephyr_cdc_acm_uart);
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
 
-static uint8_t rx_ring_buffer[USB_CDC_RX_RING_BUF_SIZE];
-static uint8_t tx_ring_buffer[USB_CDC_TX_RING_BUF_SIZE];
-static struct ring_buf rx_ringbuf;
-static struct ring_buf tx_ringbuf;
-static struct k_work rx_work;
-static struct k_work_delayable rx_flush_work;
-static uint8_t proto_rx_buf[USB_CDC_PROTO_RX_BUF_SIZE];
 static struct usb_cdc_ctx ctx = {
-	.lifecycle = MODULE_STATE_OFF,
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
 	.business = USB_CDC_BUS_OFFLINE,
+	.cdc_dev = DEVICE_DT_GET_ONE(zephyr_cdc_acm_uart),
 	.usb_active = false,
 	.proto_rx_len = 0U,
 };
 
+#define proto_rx_buf ctx.proto_rx_buf
+
 static void validate_line_coding(void);
 
 static bool lifecycle_is_ready(void)
 {
-	return ctx.lifecycle == MODULE_STATE_READY;
+	return module_lifecycle_is_running(&ctx.lc);
 }
 
 static enum proto_transport_link_state transport_link_state_get(void)
@@ -75,44 +96,36 @@ static enum proto_transport_link_state transport_link_state_get(void)
 		       PROTO_TRANSPORT_LINK_DOWN;
 }
 
-static bool control_poll_needed(enum module_state lifecycle,
-				enum usb_cdc_business_state business)
-{
-	ARG_UNUSED(lifecycle);
-	ARG_UNUSED(business);
-	return false;
-}
-
 static void reset_ring_buffers(void)
 {
 	unsigned int key = irq_lock();
 
-	ring_buf_init(&rx_ringbuf, sizeof(rx_ring_buffer), rx_ring_buffer);
+	ring_buf_init(&ctx.rx_ringbuf, sizeof(ctx.rx_ring_buffer), ctx.rx_ring_buffer);
-	ring_buf_init(&tx_ringbuf, sizeof(tx_ring_buffer), tx_ring_buffer);
+	ring_buf_init(&ctx.tx_ringbuf, sizeof(ctx.tx_ring_buffer), ctx.tx_ring_buffer);
 
 	irq_unlock(key);
 }
 
 static void disable_uart_io(void)
 {
-	uart_irq_rx_disable(cdc_dev);
+	uart_irq_rx_disable(ctx.cdc_dev);
-	uart_irq_tx_disable(cdc_dev);
+	uart_irq_tx_disable(ctx.cdc_dev);
 	ctx.proto_rx_len = 0U;
-	k_work_cancel_delayable(&rx_flush_work);
+	k_work_cancel_delayable(&ctx.rx_flush_work);
 	reset_ring_buffers();
 }
 
-static void state_reconcile(enum module_state old_lifecycle,
+static void state_reconcile(enum module_lifecycle old_lifecycle,
 			    enum usb_cdc_business_state old_business)
 {
 	enum proto_transport_link_state old_link =
-		((old_lifecycle == MODULE_STATE_READY) &&
+		((old_lifecycle == LC_RUNNING) &&
 		 (old_business == USB_CDC_SESSION_READY)) ?
 			PROTO_TRANSPORT_LINK_READY :
 			PROTO_TRANSPORT_LINK_DOWN;
 	enum proto_transport_link_state new_link = transport_link_state_get();
 
-	if ((old_lifecycle == MODULE_STATE_READY) &&
+	if ((old_lifecycle == LC_RUNNING) &&
 	    (old_business == USB_CDC_SESSION_READY) &&
 	    (new_link == PROTO_TRANSPORT_LINK_DOWN)) {
 		disable_uart_io();
@@ -124,17 +137,17 @@ static void state_reconcile(enum module_state old_lifecycle,
 
 		validate_line_coding();
 
-		err = uart_line_ctrl_set(cdc_dev, UART_LINE_CTRL_DCD, 1);
+		err = uart_line_ctrl_set(ctx.cdc_dev, UART_LINE_CTRL_DCD, 1);
 		if (err) {
 			LOG_WRN("Failed to set DCD (%d)", err);
 		}
 
-		err = uart_line_ctrl_set(cdc_dev, UART_LINE_CTRL_DSR, 1);
+		err = uart_line_ctrl_set(ctx.cdc_dev, UART_LINE_CTRL_DSR, 1);
 		if (err) {
 			LOG_WRN("Failed to set DSR (%d)", err);
 		}
 
-		uart_irq_rx_enable(cdc_dev);
+		uart_irq_rx_enable(ctx.cdc_dev);
 	}
 
 	if (old_link != new_link) {
@@ -143,23 +156,9 @@ static void state_reconcile(enum module_state old_lifecycle,
 	}
 }
 
-static void lifecycle_set(enum module_state new_state)
-{
-	enum module_state old_lifecycle = ctx.lifecycle;
-	enum usb_cdc_business_state old_business = ctx.business;
-
-	if (ctx.lifecycle == new_state) {
-		return;
-	}
-
-	ctx.lifecycle = new_state;
-	state_reconcile(old_lifecycle, old_business);
-	module_set_state(new_state);
-}
-
 static void business_state_set(enum usb_cdc_business_state new_state)
 {
-	enum module_state old_lifecycle = ctx.lifecycle;
+	enum module_lifecycle old_lifecycle = ctx.lc.state;
 	enum usb_cdc_business_state old_business = ctx.business;
 
 	if (ctx.business == new_state) {
@@ -192,7 +191,7 @@ static void kick_tx(void)
 		return;
 	}
 
-	uart_irq_tx_enable(cdc_dev);
+	uart_irq_tx_enable(ctx.cdc_dev);
 }
 
 static void validate_line_coding(void)
@@ -200,7 +199,7 @@ static void validate_line_coding(void)
 	uint32_t baudrate = 0U;
 	int err;
 
-	err = uart_line_ctrl_get(cdc_dev, UART_LINE_CTRL_BAUD_RATE, &baudrate);
+	err = uart_line_ctrl_get(ctx.cdc_dev, UART_LINE_CTRL_BAUD_RATE, &baudrate);
 	if (err) {
 		LOG_WRN("Failed to get CDC baudrate (%d)", err);
 	} else {
@@ -215,7 +214,7 @@ static void validate_line_coding(void)
 	{
 		struct uart_config cfg;
 
-		err = uart_config_get(cdc_dev, &cfg);
+		err = uart_config_get(ctx.cdc_dev, &cfg);
 		if (err) {
 			LOG_WRN("uart_config_get failed (%d)", err);
 		} else {
@@ -243,7 +242,7 @@ static void rx_work_handler(struct k_work *work)
 		uint32_t len;
 		unsigned int key = irq_lock();
 
-		len = ring_buf_get(&rx_ringbuf, buffer, sizeof(buffer));
+			len = ring_buf_get(&ctx.rx_ringbuf, buffer, sizeof(buffer));
 		irq_unlock(key);
 
 		if (len == 0U) {
@@ -259,7 +258,7 @@ static void rx_work_handler(struct k_work *work)
 		if (len > 0U) {
 			memcpy(&proto_rx_buf[ctx.proto_rx_len], buffer, len);
 			ctx.proto_rx_len += len;
-			k_work_reschedule(&rx_flush_work, USB_CDC_PROTO_RX_FLUSH_DELAY);
+			k_work_reschedule(&ctx.rx_flush_work, USB_CDC_PROTO_RX_FLUSH_DELAY);
 		}
 	}
 }
@@ -296,7 +295,7 @@ static void cdc_interrupt_handler(const struct device *dev, void *user_data)
 				uint32_t written;
 				unsigned int key = irq_lock();
 
-				written = ring_buf_put(&rx_ringbuf, buffer,
+				written = ring_buf_put(&ctx.rx_ringbuf, buffer,
 						       (uint32_t)recv_len);
 				irq_unlock(key);
 
@@ -305,7 +304,7 @@ static void cdc_interrupt_handler(const struct device *dev, void *user_data)
 						recv_len - (int)written);
 				}
 
-				k_work_submit(&rx_work);
+				k_work_submit(&ctx.rx_work);
 			}
 		}
 
@@ -315,7 +314,7 @@ static void cdc_interrupt_handler(const struct device *dev, void *user_data)
 			int sent_len;
 			unsigned int key = irq_lock();
 
-			len = ring_buf_get(&tx_ringbuf, buffer, sizeof(buffer));
+			len = ring_buf_get(&ctx.tx_ringbuf, buffer, sizeof(buffer));
 			irq_unlock(key);
 
 			if (len == 0U) {
@@ -335,37 +334,52 @@ static void cdc_interrupt_handler(const struct device *dev, void *user_data)
 	}
 }
 
-static int module_init(void)
+static int do_init(void)
 {
-	if (!device_is_ready(cdc_dev)) {
+	if (!device_is_ready(ctx.cdc_dev)) {
 		LOG_ERR("CDC ACM device not ready");
 		return -ENODEV;
 	}
 
 	reset_ring_buffers();
-	k_work_init(&rx_work, rx_work_handler);
+	k_work_init(&ctx.rx_work, rx_work_handler);
-	k_work_init_delayable(&rx_flush_work, rx_flush_work_handler);
+	k_work_init_delayable(&ctx.rx_flush_work, rx_flush_work_handler);
-	uart_irq_callback_set(cdc_dev, cdc_interrupt_handler);
+	uart_irq_callback_set(ctx.cdc_dev, cdc_interrupt_handler);
-	ctx = (struct usb_cdc_ctx) {
+	ctx.business = USB_CDC_BUS_OFFLINE;
-		.lifecycle = MODULE_STATE_OFF,
+	ctx.usb_active = false;
-		.business = USB_CDC_BUS_OFFLINE,
+	ctx.proto_rx_len = 0U;
-		.usb_active = false,
-		.proto_rx_len = 0U,
-	};
 
 	return 0;
 }
 
-static void module_start(void)
+static int do_start(void)
 {
-	lifecycle_set(MODULE_STATE_READY);
+	return 0;
+}
+
+static int do_stop(void)
+{
+	ctx.business = USB_CDC_BUS_OFFLINE;
+	return 0;
+}
+
+static int apply_lifecycle(enum module_lifecycle target)
+{
+	enum module_lifecycle old_lifecycle = ctx.lc.state;
+	enum usb_cdc_business_state old_business = ctx.business;
+	int err = module_set_lifecycle(&ctx.lc, target);
+
+	if (err) {
+		return err;
+	}
+
+	state_reconcile(old_lifecycle, old_business);
+
+	if (target == LC_RUNNING) {
 		business_state_sync_from_usb();
 	}
 
-static void module_pause(void)
+	return 0;
-{
-	business_state_set(USB_CDC_BUS_OFFLINE);
-	lifecycle_set(MODULE_STATE_STANDBY);
 }
 
 static bool handle_usb_state_event(const struct usb_state_event *event)
@@ -384,7 +398,7 @@ static bool handle_usb_state_event(const struct usb_state_event *event)
 
 static bool handle_usb_control_event(const struct usb_control_event *event)
 {
-	if (event->dev != cdc_dev) {
+	if (event->dev != ctx.cdc_dev) {
 		return false;
 	}
 
@@ -449,7 +463,7 @@ static bool handle_proto_tx_event(const struct proto_tx_event *event)
 	}
 
 	key = irq_lock();
-	written = ring_buf_put(&tx_ringbuf, event->dyndata.data,
+	written = ring_buf_put(&ctx.tx_ringbuf, event->dyndata.data,
 			       (uint32_t)event->dyndata.size);
 	irq_unlock(key);
 
@@ -483,32 +497,23 @@ static bool app_event_handler(const struct app_event_header *aeh)
 			cast_module_state_event(aeh);
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (ctx.lifecycle == MODULE_STATE_OFF) {
+			(void)apply_lifecycle(LC_RUNNING);
-				int err = module_init();
-
-				if (err) {
-					lifecycle_set(MODULE_STATE_ERROR);
-					return false;
-				}
-			}
-
-			module_start();
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (ctx.lifecycle != MODULE_STATE_OFF) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)apply_lifecycle(LC_STOPPED);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (ctx.lifecycle != MODULE_STATE_OFF) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_start();
+			(void)apply_lifecycle(LC_RUNNING);
 		}
 
 		return false;

src/usb_device_module.c

@@ -15,6 +15,7 @@
 
 #include <caf/events/power_manager_event.h>
 
+#include "module_lifecycle.h"
 #include "usb_function_hook.h"
 #include "usb_control_event.h"
 #include "usb_state_event.h"
@@ -40,9 +41,6 @@ static const char *const class_blocklist[] = {
 	NULL,
 };
 
-static bool initialized;
-static bool running;
-
 enum usb_stack_state {
 	USB_STACK_UNINITIALIZED = 0,
 	USB_STACK_DISABLED,
@@ -58,11 +56,35 @@ enum usb_bus_state {
 };
 
 struct usb_owner_ctx {
+	struct module_lifecycle_ctx lc;
 	enum usb_stack_state stack;
 	enum usb_bus_state bus;
 };
 
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+/* Project exception: mode policy suspend/resume controls USB availability,
+ * while global power events still map to standby lifecycle transitions.
+ */
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_SUSPEND,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
 static struct usb_owner_ctx usb_ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
 	.stack = USB_STACK_UNINITIALIZED,
 	.bus = USB_BUS_DISCONNECTED,
 };
@@ -363,7 +385,7 @@ static int usb_stack_disable_if_needed(void)
 	return 0;
 }
 
-static int module_init(void)
+static int do_init(void)
 {
 	usb_ctx.stack = USB_STACK_UNINITIALIZED;
 	usb_ctx.bus = USB_BUS_DISCONNECTED;
@@ -372,25 +394,25 @@ static int module_init(void)
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
-	if (running) {
+	if (module_lifecycle_is_running(&usb_ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
 	submit_usb_state(usb_public_state_get());
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&usb_ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	running = false;
 	submit_usb_state(usb_public_state_get());
+
+	return 0;
 }
 
 static bool handle_module_state_event(const struct module_state_event *event)
@@ -399,26 +421,7 @@ static bool handle_module_state_event(const struct module_state_event *event)
 		return false;
 	}
 
-	if (!initialized) {
+	(void)module_set_lifecycle(&usb_ctx.lc, LC_RUNNING);
-		int err = module_init();
-
-		if (err) {
-			module_set_state(MODULE_STATE_ERROR);
-			return false;
-		}
-
-		initialized = true;
-	}
-
-	if (!running) {
-		int err = module_start();
-
-		if (err) {
-			module_set_state(MODULE_STATE_ERROR);
-		} else if (usb_stack_was_initialized()) {
-			module_set_state(MODULE_STATE_READY);
-		}
-	}
 
 	return false;
 }
@@ -426,38 +429,38 @@ static bool handle_module_state_event(const struct module_state_event *event)
 static bool handle_module_suspend_req_event(
 	const struct module_suspend_req_event *event)
 {
-	if ((event->sink_module_id != MODULE_ID(MODULE)) || !running) {
+	if ((event->sink_module_id != MODULE_ID(MODULE)) ||
+	    (usb_ctx.lc.state != LC_RUNNING)) {
 		return false;
 	}
 
 	int err = usb_stack_disable_if_needed();
 
 	if (err) {
-		module_set_state(MODULE_STATE_ERROR);
+		LOG_WRN("USB suspend request failed (%d)", err);
 		return false;
 	}
 
-	module_set_state(MODULE_STATE_READY);
+	(void)module_set_lifecycle(&usb_ctx.lc, LC_SUSPENDED);
 	return false;
 }
 
 static bool handle_module_resume_req_event(
 	const struct module_resume_req_event *event)
 {
-	if ((event->sink_module_id != MODULE_ID(MODULE)) || !running) {
+	if ((event->sink_module_id != MODULE_ID(MODULE)) ||
+	    (usb_ctx.lc.state != LC_SUSPENDED)) {
 		return false;
 	}
 
 	int err = usb_stack_enable_if_needed();
 
 	if (err) {
-		module_set_state(MODULE_STATE_ERROR);
+		LOG_WRN("USB resume request failed (%d)", err);
 		return false;
 	}
 
-	if (usb_stack_was_initialized()) {
+	(void)module_set_lifecycle(&usb_ctx.lc, LC_RUNNING);
-		module_set_state(MODULE_STATE_READY);
-	}
 
 	return false;
 }
@@ -479,23 +482,16 @@ static bool app_event_handler(const struct app_event_header *aeh)
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&usb_ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&usb_ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&usb_ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&usb_ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else if (usb_stack_was_initialized()) {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/usb_hid_consumer_module.c

@@ -18,32 +18,57 @@
 #include "hid_report_sent_event.h"
 #include "hid_tx_report_event.h"
 #include "keyboard_core.h"
+#include "module_lifecycle.h"
 #include "usb_function_hook.h"
 #include "usb_state_event.h"
 
 LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 
-static const struct device *const hid_dev =
-	DEVICE_DT_GET(DT_NODELABEL(hid_consumer));
-
 static const uint8_t consumer_report_desc[] = {
 	0x05, 0x0C, 0x09, 0x01, 0xA1, 0x01, 0x15, 0x00,
 	0x26, 0xFF, 0x03, 0x19, 0x00, 0x2A, 0xFF, 0x03,
 	0x75, 0x10, 0x95, 0x01, 0x81, 0x00, 0xC0
 };
 
-static bool initialized;
+struct usb_hid_consumer_module_ctx {
-static bool running;
+	struct module_lifecycle_ctx lc;
-static bool usb_active;
+	const struct device *hid_dev;
-static bool iface_ready;
+	bool usb_active;
-static bool report_in_flight;
+	bool iface_ready;
-static uint16_t in_flight_sequence;
+	bool report_in_flight;
+	uint16_t in_flight_sequence;
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct usb_hid_consumer_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.hid_dev = DEVICE_DT_GET(DT_NODELABEL(hid_consumer)),
+};
 
 UDC_STATIC_BUF_DEFINE(consumer_tx_buf, KEYBOARD_CONSUMER_REPORT_SIZE);
 
 static void publish_consumer_state(void)
 {
-	bool ready = running && usb_active && iface_ready;
+	bool ready = module_lifecycle_is_running(&ctx.lc) &&
+		     ctx.usb_active && ctx.iface_ready;
 
 	submit_hid_channel_state_event(HID_SEND_CH_USB_CONSUMER,
 				       ready ? BIT(KEYBOARD_REPORT_TYPE_CONSUMER) : 0U,
@@ -54,12 +79,13 @@ static void consumer_iface_ready(const struct device *dev, const bool ready)
 {
 	ARG_UNUSED(dev);
 
-	iface_ready = ready;
+	ctx.iface_ready = ready;
 	if (!ready) {
-		report_in_flight = false;
+		ctx.report_in_flight = false;
 	}
 
-	LOG_INF("%s interface %s", hid_dev->name, ready ? "ready" : "not ready");
+	LOG_INF("%s interface %s", ctx.hid_dev->name,
+		ready ? "ready" : "not ready");
 	publish_consumer_state();
 }
 
@@ -117,10 +143,10 @@ static void consumer_input_report_done(const struct device *dev,
 	ARG_UNUSED(dev);
 	ARG_UNUSED(report);
 
-	report_in_flight = false;
+	ctx.report_in_flight = false;
 	submit_hid_report_sent_event(HID_SEND_CH_USB_CONSUMER,
 				     KEYBOARD_REPORT_TYPE_CONSUMER,
-				     in_flight_sequence, false);
+				     ctx.in_flight_sequence, false);
 }
 
 static void consumer_output_report(const struct device *dev,
@@ -145,59 +171,59 @@ static const struct hid_device_ops consumer_ops = {
 
 static int usb_hid_consumer_register_device(void)
 {
-	if (!device_is_ready(hid_dev)) {
+	if (!device_is_ready(ctx.hid_dev)) {
-		LOG_ERR("HID device %s not ready", hid_dev->name);
+		LOG_ERR("HID device %s not ready", ctx.hid_dev->name);
 		return -ENODEV;
 	}
 
-	return hid_device_register(hid_dev, consumer_report_desc,
+	return hid_device_register(ctx.hid_dev, consumer_report_desc,
 				   sizeof(consumer_report_desc), &consumer_ops);
 }
 
 USB_FUNCTION_HOOK_DEFINE(usb_hid_consumer_hook, usb_hid_consumer_register_device);
 
-static int module_init(void)
+static int do_init(void)
 {
-	usb_active = false;
+	ctx.usb_active = false;
-	iface_ready = false;
+	ctx.iface_ready = false;
-	report_in_flight = false;
+	ctx.report_in_flight = false;
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
 	publish_consumer_state();
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	running = false;
+	ctx.report_in_flight = false;
-	report_in_flight = false;
 	publish_consumer_state();
+
+	return 0;
 }
 
 static bool handle_usb_state_event(const struct usb_state_event *event)
 {
 	bool new_usb_active = (event->state == USB_STATE_ACTIVE);
 
-	if (new_usb_active == usb_active) {
+	if (new_usb_active == ctx.usb_active) {
 		return false;
 	}
 
-	usb_active = new_usb_active;
+	ctx.usb_active = new_usb_active;
-	if (!usb_active) {
+	if (!ctx.usb_active) {
-		iface_ready = false;
+		ctx.iface_ready = false;
-		report_in_flight = false;
+		ctx.report_in_flight = false;
 	}
 
 	publish_consumer_state();
@@ -208,7 +234,7 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 {
 	int err;
 
-	if (!running || !usb_active ||
+	if (!module_lifecycle_is_running(&ctx.lc) || !ctx.usb_active ||
 	    (event->channel != HID_SEND_CH_USB_CONSUMER)) {
 		return false;
 	}
@@ -217,17 +243,17 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 		return false;
 	}
 
-	if (!iface_ready) {
+	if (!ctx.iface_ready) {
 		return false;
 	}
 
-	if (report_in_flight) {
+	if (ctx.report_in_flight) {
 		LOG_WRN("Drop USB consumer report while previous report is in flight");
 		return false;
 	}
 
 	memcpy(consumer_tx_buf, event->dyndata.data, event->dyndata.size);
-	err = hid_device_submit_report(hid_dev, (uint16_t)event->dyndata.size,
+	err = hid_device_submit_report(ctx.hid_dev, (uint16_t)event->dyndata.size,
 				       consumer_tx_buf);
 	if (err) {
 		LOG_WRN("USB consumer report submit failed (%d)", err);
@@ -235,8 +261,8 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 					     KEYBOARD_REPORT_TYPE_CONSUMER,
 					     event->sequence, true);
 	} else {
-		report_in_flight = true;
+		ctx.report_in_flight = true;
-		in_flight_sequence = event->sequence;
+		ctx.in_flight_sequence = event->sequence;
 	}
 
 	return false;
@@ -254,48 +280,25 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;

src/usb_hid_keyboard_module.c

@@ -19,6 +19,7 @@
 #include "hid_report_sent_event.h"
 #include "hid_tx_report_event.h"
 #include "keyboard_core.h"
+#include "module_lifecycle.h"
 #include "set_protocol_event.h"
 #include "usb_function_hook.h"
 #include "usb_state_event.h"
@@ -28,8 +29,6 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 #define KBD_LED_REPORT_SIZE 1U
 #define KBD_LED_REPORT_WITH_ID_SIZE (KBD_LED_REPORT_SIZE + 1U)
 
-static const struct device *const hid_dev = DEVICE_DT_GET(DT_NODELABEL(hid_kbd));
-
 static const uint8_t keyboard_report_desc[] = {
 	0x05, 0x01, 0x09, 0x06, 0xA1, 0x01, 0x05, 0x07,
 	0x19, 0xE0, 0x29, 0xE7, 0x15, 0x00, 0x25, 0x01,
@@ -41,36 +40,64 @@ static const uint8_t keyboard_report_desc[] = {
 	0x75, 0x03, 0x95, 0x01, 0x91, 0x01, 0xC0
 };
 
-static enum keyboard_protocol_mode keyboard_protocol_mode =
+struct usb_hid_keyboard_module_ctx {
-	KEYBOARD_PROTOCOL_MODE_REPORT;
+	struct module_lifecycle_ctx lc;
-static bool initialized;
+	const struct device *hid_dev;
-static bool running;
+	enum keyboard_protocol_mode keyboard_protocol_mode;
-static bool usb_active;
+	bool usb_active;
-static bool iface_ready;
+	bool iface_ready;
-static bool report_in_flight;
+	bool report_in_flight;
-static uint16_t in_flight_sequence;
+	uint16_t in_flight_sequence;
+};
+
+static int do_init(void);
+static int do_start(void);
+static int do_stop(void);
+
+static const struct module_lifecycle_cfg lifecycle_cfg = {
+	.mode = ML_MODE_POWER,
+	.stopped_state = MODULE_STATE_STANDBY,
+};
+
+static const struct module_lifecycle_ops lifecycle_ops = {
+	.do_init = do_init,
+	.do_start = do_start,
+	.do_stop = do_stop,
+};
+
+static struct usb_hid_keyboard_module_ctx ctx = {
+	.lc = {
+		.state = LC_UNINIT,
+		.cfg = &lifecycle_cfg,
+		.ops = &lifecycle_ops,
+	},
+	.hid_dev = DEVICE_DT_GET(DT_NODELABEL(hid_kbd)),
+	.keyboard_protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT,
+};
 
 UDC_STATIC_BUF_DEFINE(keyboard_tx_buf, KEYBOARD_NKRO_REPORT_SIZE);
 
 static void publish_keyboard_state(void)
 {
-	bool ready = running && usb_active && iface_ready;
+	bool ready = module_lifecycle_is_running(&ctx.lc) &&
+		     ctx.usb_active && ctx.iface_ready;
 
 	submit_hid_channel_state_event(HID_SEND_CH_USB_KEYS,
 				       ready ? BIT(KEYBOARD_REPORT_TYPE_KEYS) : 0U,
-				       keyboard_protocol_mode);
+				       ctx.keyboard_protocol_mode);
 }
 
 static void keyboard_iface_ready(const struct device *dev, const bool ready)
 {
 	ARG_UNUSED(dev);
 
-	iface_ready = ready;
+	ctx.iface_ready = ready;
 	if (!ready) {
-		report_in_flight = false;
+		ctx.report_in_flight = false;
 	}
 
-	LOG_INF("%s interface %s", hid_dev->name, ready ? "ready" : "not ready");
+	LOG_INF("%s interface %s", ctx.hid_dev->name,
+		ready ? "ready" : "not ready");
 	publish_keyboard_state();
 }
 
@@ -164,11 +191,11 @@ static void keyboard_set_protocol(const struct device *dev, const uint8_t proto)
 
 	enum keyboard_protocol_mode new_mode = usb_proto_to_keyboard_proto(proto);
 
-	if (keyboard_protocol_mode == new_mode) {
+	if (ctx.keyboard_protocol_mode == new_mode) {
 		return;
 	}
 
-	keyboard_protocol_mode = new_mode;
+	ctx.keyboard_protocol_mode = new_mode;
 	LOG_INF("USB keyboard protocol -> %s",
 		(new_mode == KEYBOARD_PROTOCOL_MODE_BOOT) ? "boot" : "report");
 	submit_set_protocol_event(HID_TRANSPORT_USB, new_mode);
@@ -181,10 +208,10 @@ static void keyboard_input_report_done(const struct device *dev,
 	ARG_UNUSED(dev);
 	ARG_UNUSED(report);
 
-	report_in_flight = false;
+	ctx.report_in_flight = false;
 	submit_hid_report_sent_event(HID_SEND_CH_USB_KEYS,
 				     KEYBOARD_REPORT_TYPE_KEYS,
-				     in_flight_sequence, false);
+				     ctx.in_flight_sequence, false);
 }
 
 static void keyboard_output_report(const struct device *dev,
@@ -211,60 +238,60 @@ static const struct hid_device_ops keyboard_ops = {
 
 static int usb_hid_keyboard_register_device(void)
 {
-	if (!device_is_ready(hid_dev)) {
+	if (!device_is_ready(ctx.hid_dev)) {
-		LOG_ERR("HID device %s not ready", hid_dev->name);
+		LOG_ERR("HID device %s not ready", ctx.hid_dev->name);
 		return -ENODEV;
 	}
 
-	return hid_device_register(hid_dev, keyboard_report_desc,
+	return hid_device_register(ctx.hid_dev, keyboard_report_desc,
 				   sizeof(keyboard_report_desc), &keyboard_ops);
 }
 
 USB_FUNCTION_HOOK_DEFINE(usb_hid_keyboard_hook, usb_hid_keyboard_register_device);
 
-static int module_init(void)
+static int do_init(void)
 {
-	keyboard_protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
+	ctx.keyboard_protocol_mode = KEYBOARD_PROTOCOL_MODE_REPORT;
-	usb_active = false;
+	ctx.usb_active = false;
-	iface_ready = false;
+	ctx.iface_ready = false;
-	report_in_flight = false;
+	ctx.report_in_flight = false;
 	return 0;
 }
 
-static int module_start(void)
+static int do_start(void)
 {
-	if (running) {
+	if (module_lifecycle_is_running(&ctx.lc)) {
 		return 0;
 	}
 
-	running = true;
 	publish_keyboard_state();
 	return 0;
 }
 
-static void module_pause(void)
+static int do_stop(void)
 {
-	if (!running) {
+	if (!module_lifecycle_is_running(&ctx.lc)) {
-		return;
+		return 0;
 	}
 
-	running = false;
+	ctx.report_in_flight = false;
-	report_in_flight = false;
 	publish_keyboard_state();
+
+	return 0;
 }
 
 static bool handle_usb_state_event(const struct usb_state_event *event)
 {
 	bool new_usb_active = (event->state == USB_STATE_ACTIVE);
 
-	if (new_usb_active == usb_active) {
+	if (new_usb_active == ctx.usb_active) {
 		return false;
 	}
 
-	usb_active = new_usb_active;
+	ctx.usb_active = new_usb_active;
-	if (!usb_active) {
+	if (!ctx.usb_active) {
-		iface_ready = false;
+		ctx.iface_ready = false;
-		report_in_flight = false;
+		ctx.report_in_flight = false;
 	}
 
 	publish_keyboard_state();
@@ -275,7 +302,7 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 {
 	int err;
 
-	if (!running || !usb_active ||
+	if (!module_lifecycle_is_running(&ctx.lc) || !ctx.usb_active ||
 	    (event->channel != HID_SEND_CH_USB_KEYS)) {
 		return false;
 	}
@@ -284,22 +311,22 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 		return false;
 	}
 
-	if (event->protocol_mode != keyboard_protocol_mode) {
+	if (event->protocol_mode != ctx.keyboard_protocol_mode) {
 		LOG_WRN("Drop USB keys report due to protocol mismatch");
 		return false;
 	}
 
-	if (!iface_ready) {
+	if (!ctx.iface_ready) {
 		return false;
 	}
 
-	if (report_in_flight) {
+	if (ctx.report_in_flight) {
 		LOG_WRN("Drop USB keyboard report while previous report is in flight");
 		return false;
 	}
 
 	memcpy(keyboard_tx_buf, event->dyndata.data, event->dyndata.size);
-	err = hid_device_submit_report(hid_dev, (uint16_t)event->dyndata.size,
+	err = hid_device_submit_report(ctx.hid_dev, (uint16_t)event->dyndata.size,
 				       keyboard_tx_buf);
 	if (err) {
 			LOG_WRN("USB keyboard report submit failed (%d)", err);
@@ -307,8 +334,8 @@ static bool handle_hid_tx_report_event(const struct hid_tx_report_event *event)
 						     KEYBOARD_REPORT_TYPE_KEYS,
 						     event->sequence, true);
 	} else {
-		report_in_flight = true;
+		ctx.report_in_flight = true;
-		in_flight_sequence = event->sequence;
+		ctx.in_flight_sequence = event->sequence;
 	}
 
 	return false;
@@ -326,48 +353,25 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
-		int err;
 
 		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
-			if (!initialized) {
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-				err = module_init();
-				if (err) {
-					module_set_state(MODULE_STATE_ERROR);
-					return false;
-				}
-
-				initialized = true;
-			}
-
-			err = module_start();
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;
 	}
 
 	if (is_power_down_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			module_pause();
+			(void)module_set_lifecycle(&ctx.lc, LC_STOPPED);
-			module_set_state(MODULE_STATE_STANDBY);
 		}
 
 		return false;
 	}
 
 	if (is_wake_up_event(aeh)) {
-		if (initialized) {
+		if (module_lifecycle_is_initialized(&ctx.lc)) {
-			int err = module_start();
+			(void)module_set_lifecycle(&ctx.lc, LC_RUNNING);
-
-			if (err) {
-				module_set_state(MODULE_STATE_ERROR);
-			} else {
-				module_set_state(MODULE_STATE_READY);
-			}
 		}
 
 		return false;