echoplayer: add function to enable 1V8 regulator

commit d15ccd771ddc6b869e65e002e3547af75a81349d
Author: Aidan MacDonald <[email protected]>
Date:   Fri Jan 9 23:59:19 2026 +0000

    echoplayer: add function to enable 1V8 regulator
    
    This supply is shared by the USB PHY and the audio codec,
    so it needs to be reference counted to allow them to be
    powered up & down independently (and not just leave the
    1V8 regulator enabled all the time).
    
    Change-Id: Ib99b41c2a94b9f0c378153b33c6f91b4370ee998

diff --git a/firmware/target/arm/stm32/echoplayer/power-echoplayer.c b/firmware/target/arm/stm32/echoplayer/power-echoplayer.c
index e001a3a6f2..3482d884eb 100644
--- a/firmware/target/arm/stm32/echoplayer/power-echoplayer.c
+++ b/firmware/target/arm/stm32/echoplayer/power-echoplayer.c
@@ -19,6 +19,11 @@
  *
  ****************************************************************************/
 #include "power.h"
+#include "mutex.h"
+#include "gpio-stm32h7.h"
+
+static struct mutex power_1v8_lock;
+static int power_1v8_refcount;
 
 unsigned short battery_level_disksafe = 3500;
 unsigned short battery_level_shutoff = 3400;
@@ -35,9 +40,29 @@ unsigned short percent_to_volt_charge[11] =
     3485, 3780, 3836, 3857, 3890, 3930, 3986, 4062, 4158, 4185, 4196
 };
 
+/* API for enabling 1V8 regulator */
+void echoplayer_enable_1v8_regulator(bool enable)
+{
+    mutex_lock(&power_1v8_lock);
+
+    if (enable)
+    {
+        if (power_1v8_refcount++ == 0)
+            gpio_set_level(GPIO_POWER_1V8, 1);
+    }
+    else
+    {
+        if (--power_1v8_refcount == 0)
+            gpio_set_level(GPIO_POWER_1V8, 0);
+    }
+
+    mutex_unlock(&power_1v8_lock);
+}
+
 /* Power management */
 void power_init(void)
 {
+    mutex_init(&power_1v8_lock);
 }
 
 void power_off(void)
diff --git a/firmware/target/arm/stm32/echoplayer/power-echoplayer.h b/firmware/target/arm/stm32/echoplayer/power-echoplayer.h
new file mode 100644
index 0000000000..555b55c034
--- /dev/null
+++ b/firmware/target/arm/stm32/echoplayer/power-echoplayer.h
@@ -0,0 +1,28 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2026 by Aidan MacDonald
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef __POWER_ECHOPLAYER_H__
+#define __POWER_ECHOPLAYER_H__
+
+#include <stdbool.h>
+
+void echoplayer_enable_1v8_regulator(bool enable);
+
+#endif /* __POWER_ECHOPLAYER_H__ */
-- 
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