fix(usb): detect USB power mode to fallback to BLE

* Add tracking to see if we ever hit a configured status before
  suspend, so we can properly track "is connected" even when
  connected to a suspended/asleep host.

2 files changed, 11 insertions, 3 deletions

diff --git a/app/include/zmk/usb.h b/app/include/zmk/usb.h
index 540cdd9c7e..a5e5089f88 100644
--- a/app/include/zmk/usb.h
+++ b/app/include/zmk/usb.h
@@ -24,6 +24,4 @@ enum zmk_usb_conn_state zmk_usb_get_conn_state(void);
 static inline bool zmk_usb_is_powered(void) {
     return zmk_usb_get_conn_state() != ZMK_USB_CONN_NONE;
 }
-static inline bool zmk_usb_is_hid_ready(void) {
-    return zmk_usb_get_conn_state() == ZMK_USB_CONN_HID;
-}
+bool zmk_usb_is_hid_ready(void);
diff --git a/app/src/usb.c b/app/src/usb.c
index cd78761834..cf76341eee 100644
--- a/app/src/usb.c
+++ b/app/src/usb.c
@@ -20,6 +20,7 @@
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 static enum usb_dc_status_code usb_status = USB_DC_UNKNOWN;
+static bool is_configured;
 
 static void raise_usb_status_changed_event(struct k_work *_work) {
     raise_zmk_usb_conn_state_changed(
@@ -49,6 +50,10 @@ enum zmk_usb_conn_state zmk_usb_get_conn_state(void) {
     }
 }
 
+bool zmk_usb_is_hid_ready(void) {
+    return zmk_usb_get_conn_state() == ZMK_USB_CONN_HID && is_configured;
+}
+
 void usb_status_cb(enum usb_dc_status_code status, const uint8_t *params) {
     // Start-of-frame events are too frequent and noisy to notify, and they're
     // not used within ZMK
@@ -62,6 +67,11 @@ void usb_status_cb(enum usb_dc_status_code status, const uint8_t *params) {
     }
 #endif
     usb_status = status;
+    if (zmk_usb_get_conn_state() == ZMK_USB_CONN_HID) {
+        is_configured |= usb_status == USB_DC_CONFIGURED;
+    } else {
+        is_configured = false;
+    }
     k_work_submit(&usb_status_notifier_work);
 };