feat(underglow): RGB toggle controls ext_power

fix(ug): Don't return if finding ext power fails

fix(ug): Move ext_power to a static variable

Add #if defs

app/Kconfig

@@ -187,6 +187,10 @@ if ZMK_RGB_UNDERGLOW
 config SPI
 	default y
 
+config ZMK_RGB_UNDERGLOW_EXT_POWER
+	bool "RGB underglow toggling also controls external power"
+	default y
+
 config ZMK_RGB_UNDERGLOW_HUE_STEP
 	int "RGB underglow hue step in degrees of 360"
 	default 10
@@ -220,7 +224,7 @@ config ZMK_RGB_UNDERGLOW_EFF_START
 	default 0
 
 config ZMK_RGB_UNDERGLOW_ON_START
-	bool "Whether RGB underglow starts on by default"
+	bool "RGB underglow starts on by default"
 	default y
 
 #ZMK_RGB_UNDERGLOW

app/src/rgb_underglow.c

@@ -15,6 +15,7 @@
 #include <logging/log.h>
 
 #include <drivers/led_strip.h>
+#include <drivers/ext_power.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -45,34 +46,14 @@ struct rgb_underglow_state {
     bool on;
 };
 
-struct device *led_strip;
+static struct device *led_strip;
 
-struct led_rgb pixels[STRIP_NUM_PIXELS];
+static struct led_rgb pixels[STRIP_NUM_PIXELS];
 
-struct rgb_underglow_state state;
+static struct rgb_underglow_state state;
 
-#if IS_ENABLED(CONFIG_SETTINGS)
-static int rgb_settings_set(const char *name, size_t len, settings_read_cb read_cb, void *cb_arg) {
-    const char *next;
-    int rc;
-
-    if (settings_name_steq(name, "state", &next) && !next) {
-        if (len != sizeof(state)) {
-            return -EINVAL;
-        }
-
-        rc = read_cb(cb_arg, &state, sizeof(state));
-        if (rc >= 0) {
-            return 0;
-        }
-
-        return rc;
-    }
-
-    return -ENOENT;
-}
-
-struct settings_handler rgb_conf = {.name = "rgb/underglow", .h_set = rgb_settings_set};
+#if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_EXT_POWER)
+static struct device *ext_power;
 #endif
 
 static struct led_rgb hsb_to_rgb(struct led_hsb hsb) {
@@ -228,6 +209,29 @@ static void zmk_rgb_underglow_tick_handler(struct k_timer *timer) {
 K_TIMER_DEFINE(underglow_tick, zmk_rgb_underglow_tick_handler, NULL);
 
 #if IS_ENABLED(CONFIG_SETTINGS)
+static int rgb_settings_set(const char *name, size_t len, settings_read_cb read_cb, void *cb_arg) {
+    const char *next;
+    int rc;
+
+    if (settings_name_steq(name, "state", &next) && !next) {
+        if (len != sizeof(state)) {
+            return -EINVAL;
+        }
+
+        rc = read_cb(cb_arg, &state, sizeof(state));
+        if (rc >= 0) {
+            k_timer_start(&underglow_tick, K_NO_WAIT, K_MSEC(50));
+            return 0;
+        }
+
+        return rc;
+    }
+
+    return -ENOENT;
+}
+
+struct settings_handler rgb_conf = {.name = "rgb/underglow", .h_set = rgb_settings_set};
+
 static void zmk_rgb_underglow_save_state_work() {
     settings_save_one("rgb/underglow/state", &state, sizeof(state));
 }
@@ -244,6 +248,13 @@ static int zmk_rgb_underglow_init(struct device *_arg) {
         return -EINVAL;
     }
 
+#if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_EXT_POWER)
+    ext_power = device_get_binding("EXT_POWER");
+    if (ext_power == NULL) {
+        LOG_ERR("Unable to retrieve ext_power device: EXT_POWER");
+    }
+#endif
+
     state = (struct rgb_underglow_state){
         hue : CONFIG_ZMK_RGB_UNDERGLOW_HUE_START,
         saturation : CONFIG_ZMK_RGB_UNDERGLOW_SAT_START,
@@ -257,9 +268,9 @@ static int zmk_rgb_underglow_init(struct device *_arg) {
 #if IS_ENABLED(CONFIG_SETTINGS)
     settings_register(&rgb_conf);
     k_delayed_work_init(&underglow_save_work, zmk_rgb_underglow_save_state_work);
-#endif
-
+#else
     k_timer_start(&underglow_tick, K_NO_WAIT, K_MSEC(50));
+#endif
 
     return 0;
 }
@@ -299,6 +310,22 @@ int zmk_rgb_underglow_toggle() {
 
     state.on = !state.on;
 
+#if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_EXT_POWER)
+    if (ext_power != NULL) {
+        int rc;
+
+        if (state.on) {
+            rc = ext_power_enable(ext_power);
+        } else {
+            rc = ext_power_disable(ext_power);
+        }
+
+        if (rc != 0) {
+            LOG_ERR("Unable to toggle EXT_POWER: %d", rc);
+        }
+    }
+#endif
+
     if (state.on) {
         state.animation_step = 0;
         k_timer_start(&underglow_tick, K_NO_WAIT, K_MSEC(50));

docs/docs/features/underglow.md

@@ -35,17 +35,18 @@ If your board or shield does not have RGB underglow configured, refer to [Adding
 
 There are various Kconfig options used to configure the RGB underglow feature. These can all be set in the `.conf` file.
 
-| Option                               | Description                                    | Default |
-| ------------------------------------ | ---------------------------------------------- | ------- |
-| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_STEP`  | Hue step in degrees of 360 used by RGB actions | 10      |
-| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_STEP`  | Saturation step in percent used by RGB actions | 10      |
-| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_STEP`  | Brightness step in percent used by RGB actions | 10      |
-| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_START` | Default hue 0-359 in degrees                   | 0       |
-| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_START` | Default saturation 0-100 in percent            | 100     |
-| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_START` | Default brightness 0-100 in percent            | 100     |
-| `CONFIG_ZMK_RGB_UNDERGLOW_SPD_START` | Default effect speed 1-5                       | 3       |
-| `CONFIG_ZMK_RGB_UNDERGLOW_EFF_START` | Default effect integer from the effect enum    | 0       |
-| `CONFIG_ZMK_RGB_UNDERGLOW_ON_START`  | Default on state                               | y       |
+| Option                               | Description                                     | Default |
+| ------------------------------------ | ----------------------------------------------- | ------- |
+| `CONFIG_ZMK_RGB_UNDERGLOW_EXT_POWER` | Underglow toggling also controls external power | y       |
+| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_STEP`  | Hue step in degrees of 360 used by RGB actions  | 10      |
+| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_STEP`  | Saturation step in percent used by RGB actions  | 10      |
+| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_STEP`  | Brightness step in percent used by RGB actions  | 10      |
+| `CONFIG_ZMK_RGB_UNDERGLOW_HUE_START` | Default hue 0-359 in degrees                    | 0       |
+| `CONFIG_ZMK_RGB_UNDERGLOW_SAT_START` | Default saturation 0-100 in percent             | 100     |
+| `CONFIG_ZMK_RGB_UNDERGLOW_BRT_START` | Default brightness 0-100 in percent             | 100     |
+| `CONFIG_ZMK_RGB_UNDERGLOW_SPD_START` | Default effect speed 1-5                        | 3       |
+| `CONFIG_ZMK_RGB_UNDERGLOW_EFF_START` | Default effect integer from the effect enum     | 0       |
+| `CONFIG_ZMK_RGB_UNDERGLOW_ON_START`  | Default on state                                | y       |
 
 ## Adding RGB Underglow to a Board