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feats: prevent sleep while active BT profile connected and allow sleep while USB power connected #3288

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feats: prevent sleep while active BT profile connected and allow sleep while USB power connected #3288

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8b4bf7d
feat(ble): prevent sleep while BT is active
newx-it Mar 19, 2026
2d77d1d
feat(usb): allow sleeping while powered over USB
newx-it Mar 19, 2026
ba812cb
fix: formatting
newx-it Mar 19, 2026
f3d9aaa
fix: formatting
newx-it Mar 19, 2026
fd67eb2
fix: syntax error
newx-it Mar 19, 2026
0511b3a
fix: more formatting
newx-it Mar 19, 2026
7469360
fix: syntax
newx-it Mar 19, 2026
2441c4b
Renamed config flags
newx-it Mar 23, 2026
c5c30a1
Fix formatting for pre-commit
newx-it Mar 24, 2026
6bfae52
Updated docs to note interaction with sleep timer
newx-it Mar 24, 2026
039d460
fix: docs formatting
newx-it Mar 29, 2026
8c9ec64
fix: remove redundant kconfig default
newx-it Mar 30, 2026
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8 changes: 8 additions & 0 deletions app/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -415,6 +415,14 @@ config ZMK_IDLE_SLEEP_TIMEOUT
int "Milliseconds of inactivity before entering deep sleep"
default 900000

config ZMK_SLEEP_PREVENT_WHILE_BLE_CONNECTED
bool "Prevent sleeping while the active BT profile is connected"
depends on ZMK_BLE

config ZMK_SLEEP_PREVENT_WHILE_USB_POWERED
bool "Prevent sleeping while USB power is connected"
default y

endif # ZMK_SLEEP

config ZMK_EXT_POWER
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17 changes: 15 additions & 2 deletions app/src/activity.c
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Expand Up @@ -26,6 +26,10 @@ LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
#include <zmk/usb.h>
#endif

#if IS_ENABLED(CONFIG_ZMK_SLEEP_PREVENT_WHILE_BLE_CONNECTED)
#include <zmk/ble.h>
#endif

#if IS_ENABLED(CONFIG_ZMK_POINTING)
#include <zephyr/input/input.h>
#endif
Expand Down Expand Up @@ -75,7 +79,16 @@ void activity_work_handler(struct k_work *work) {
int32_t current = k_uptime_get();
int32_t inactive_time = current - activity_last_uptime;
#if IS_ENABLED(CONFIG_ZMK_SLEEP)
if (inactive_time > MAX_SLEEP_MS && !is_usb_power_present()) {
bool prevent_sleep =
IS_ENABLED(CONFIG_ZMK_SLEEP_PREVENT_WHILE_USB_POWERED) && is_usb_power_present();
#if IS_ENABLED(CONFIG_ZMK_SLEEP_PREVENT_WHILE_BLE_CONNECTED)
#if !IS_ENABLED(CONFIG_ZMK_SPLIT) || IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL)
prevent_sleep |= zmk_ble_active_profile_is_connected();
#else
prevent_sleep |= zmk_split_bt_peripheral_is_connected();
#endif
#endif
if (inactive_time > MAX_SLEEP_MS && !prevent_sleep) {
// Put devices in suspend power mode before sleeping
set_state(ZMK_ACTIVITY_SLEEP);

Expand Down Expand Up @@ -124,4 +137,4 @@ INPUT_CALLBACK_DEFINE(NULL, activity_input_listener, NULL);

#endif

SYS_INIT(activity_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
SYS_INIT(activity_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
14 changes: 8 additions & 6 deletions docs/docs/config/power.md
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Expand Up @@ -14,12 +14,14 @@ Configuration for entering [low power states](../features/low-power-states.md) w

Definition file: [zmk/app/Kconfig](https://github.com/zmkfirmware/zmk/blob/main/app/Kconfig)

| Config | Type | Description | Default |
| ------------------------------- | ---- | ------------------------------------------------------------------- | ------- |
| `CONFIG_ZMK_IDLE_TIMEOUT` | int | Milliseconds of inactivity before entering idle state | 30000 |
| `CONFIG_ZMK_SLEEP` | bool | Enable deep sleep support | n |
| `CONFIG_ZMK_IDLE_SLEEP_TIMEOUT` | int | Milliseconds of inactivity before entering deep sleep | 900000 |
| `CONFIG_ZMK_PM_SOFT_OFF` | bool | Enable soft off functionality from the keymap or dedicated hardware | n |
| Config | Type | Description | Default |
| ---------------------------------------------- | ---- | ------------------------------------------------------------------------------------------------------------------------------------------ | ------- |
| `CONFIG_ZMK_IDLE_TIMEOUT` | int | Milliseconds of inactivity before entering idle state | 30000 |
| `CONFIG_ZMK_SLEEP` | bool | Enable deep sleep support | n |
| `CONFIG_ZMK_IDLE_SLEEP_TIMEOUT` | int | Milliseconds of inactivity before entering deep sleep | 900000 |
| `CONFIG_ZMK_PM_SOFT_OFF` | bool | Enable soft off functionality from the keymap or dedicated hardware | n |
| `CONFIG_ZMK_SLEEP_PREVENT_WHILE_BLE_CONNECTED` | bool | Prevent sleeping while the active BT profile is connected. If the device loses connection after the sleep timer, it will sleep immediately | n |
| `CONFIG_ZMK_SLEEP_PREVENT_WHILE_USB_POWERED` | bool | Prevent sleeping while USB power is connected | y |

## External Power Control

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