Use superstruct

src/panels/lovelace/card-features/hui-media-player-volume-slider-card-feature.ts

@@ -10,7 +10,7 @@ import {
   type MediaPlayerEntity,
 } from "../../../data/media-player";
 import type { HomeAssistant } from "../../../types";
-import type { LovelaceCardFeature } from "../types";
+import type { LovelaceCardFeature, LovelaceCardFeatureEditor } from "../types";
 import { cardFeatureStyles } from "./common/card-feature-styles";
 import type {
   LovelaceCardFeatureContext,
@@ -58,6 +58,15 @@ class HuiMediaPlayerVolumeSliderCardFeature
     };
   }
 
+  public static async getConfigElement(): Promise<LovelaceCardFeatureEditor> {
+    await import(
+      "../editor/config-elements/hui-media-player-volume-slider-card-feature-editor"
+    );
+    return document.createElement(
+      "hui-media-player-volume-slider-card-feature-editor"
+    );
+  }
+
   public setConfig(config: MediaPlayerVolumeSliderCardFeatureConfig): void {
     if (!config) {
       throw new Error("Invalid configuration");
@@ -84,8 +93,9 @@ class HuiMediaPlayerVolumeSliderCardFeature
     return html`
       <ha-control-slider
         .value=${position}
-        min="0"
-        max="100"
+        .min=${this._config.min ?? 0}
+        .max=${this._config.max ?? 100}
+        .step=${this._config.step ?? 1}
         .showHandle=${stateActive(this._stateObj)}
         .disabled=${!this._stateObj || isUnavailableState(this._stateObj.state)}
         @value-changed=${this._valueChanged}

src/panels/lovelace/card-features/types.ts

@@ -45,6 +45,9 @@ export interface MediaPlayerPlaybackCardFeatureConfig {
 
 export interface MediaPlayerVolumeSliderCardFeatureConfig {
   type: "media-player-volume-slider";
+  min?: number;
+  max?: number;
+  step?: number;
 }
 
 export interface FanDirectionCardFeatureConfig {

src/panels/lovelace/editor/config-elements/hui-card-features-editor.ts

@@ -126,6 +126,7 @@ const EDITABLES_FEATURE_TYPES = new Set<UiFeatureTypes>([
   "fan-preset-modes",
   "humidifier-modes",
   "lawn-mower-commands",
+  "media-player-volume-slider",
   "numeric-input",
   "select-options",
   "update-actions",

src/panels/lovelace/editor/config-elements/hui-media-player-volume-slider-card-feature-editor.ts

@@ -0,0 +1,118 @@
+import { html, LitElement, nothing } from "lit";
+import { customElement, property, state } from "lit/decorators";
+import memoizeOne from "memoize-one";
+import { assign, assert, number, object, optional } from "superstruct";
+import { fireEvent } from "../../../../common/dom/fire_event";
+import "../../../../components/ha-form/ha-form";
+import type { SchemaUnion } from "../../../../components/ha-form/types";
+import type { HomeAssistant } from "../../../../types";
+import type { LovelaceCardFeatureEditor } from "../../types";
+import type {
+  MediaPlayerVolumeSliderCardFeatureConfig,
+  LovelaceCardFeatureContext,
+} from "../../card-features/types";
+import { baseLovelaceCardConfig } from "../structs/base-card-struct";
+
+const cardConfigStruct = assign(
+  baseLovelaceCardConfig,
+  object({
+    min: optional(number()),
+    max: optional(number()),
+    step: optional(number()),
+  })
+);
+
+@customElement("hui-media-player-volume-slider-card-feature-editor")
+export class HuiMediaPlayerVolumeSliderCardFeatureEditor
+  extends LitElement
+  implements LovelaceCardFeatureEditor
+{
+  @property({ attribute: false }) public hass?: HomeAssistant;
+
+  @property({ attribute: false }) public context?: LovelaceCardFeatureContext;
+
+  @state() private _config?: MediaPlayerVolumeSliderCardFeatureConfig;
+
+  public setConfig(config: MediaPlayerVolumeSliderCardFeatureConfig): void {
+    assert(config, cardConfigStruct);
+    this._config = config;
+  }
+
+  private _schema = memoizeOne(
+    () =>
+      [
+        {
+          name: "min",
+          selector: {
+            number: {
+              min: 0,
+              max: 100,
+              mode: "slider",
+            },
+          },
+        },
+        {
+          name: "max",
+          selector: {
+            number: {
+              min: 0,
+              max: 100,
+              mode: "slider",
+            },
+          },
+        },
+        {
+          name: "step",
+          selector: {
+            number: {
+              min: 1,
+              max: 40,
+              mode: "slider",
+            },
+          },
+        },
+      ] as const
+  );
+
+  protected render() {
+    if (!this.hass || !this._config) {
+      return nothing;
+    }
+
+    const data: MediaPlayerVolumeSliderCardFeatureConfig = {
+      min: 0,
+      max: 100,
+      step: 1,
+      ...this._config,
+    };
+
+    const schema = this._schema();
+
+    return html`
+      <ha-form
+        .hass=${this.hass}
+        .data=${data}
+        .schema=${schema}
+        .computeLabel=${this._computeLabelCallback}
+        @value-changed=${this._valueChanged}
+      ></ha-form>
+    `;
+  }
+
+  private _valueChanged(ev: CustomEvent): void {
+    fireEvent(this, "config-changed", { config: ev.detail.value });
+  }
+
+  private _computeLabelCallback = (
+    schema: SchemaUnion<ReturnType<typeof this._schema>>
+  ) =>
+    this.hass!.localize(
+      `ui.panel.lovelace.editor.features.types.media-player-volume-slider.${schema.name}`
+    );
+}
+
+declare global {
+  interface HTMLElementTagNameMap {
+    "hui-media-player-volume-slider-card-feature-editor": HuiMediaPlayerVolumeSliderCardFeatureEditor;
+  }
+}

src/translations/en.json

@@ -7988,7 +7988,10 @@
                 "label": "Media player playback controls"
               },
               "media-player-volume-slider": {
-                "label": "Media player volume slider"
+                "label": "Media player volume slider",
+                "min": "Minimum volume",
+                "max": "Maximum volume",
+                "step": "Step size"
               },
               "vacuum-commands": {
                 "label": "Vacuum commands",