터치 디스플레이 밝기 제어 추가

public/api.php

@@ -3488,6 +3488,29 @@ function touch_display_file(string $kind): string
     return $kind === 'cmdline' ? '/boot/firmware/cmdline.txt' : '/boot/firmware/config.txt';
 }
 
+function touch_display_backlight_path(): ?string
+{
+    $candidates = glob('/sys/class/backlight/*') ?: [];
+    foreach ($candidates as $path) {
+        if (is_readable($path . '/brightness') && is_readable($path . '/max_brightness')) {
+            return $path;
+        }
+    }
+
+    $fallback = '/sys/devices/platform/axi/1000120000.pcie/1f00088000.i2c/i2c-10/10-0045/backlight/10-0045';
+    return is_readable($fallback . '/brightness') && is_readable($fallback . '/max_brightness') ? $fallback : null;
+}
+
+function touch_display_read_int(?string $path): ?int
+{
+    if ($path === null || !is_readable($path)) {
+        return null;
+    }
+
+    $raw = trim((string)@file_get_contents($path));
+    return is_numeric($raw) ? (int)$raw : null;
+}
+
 function touch_display_read_file(string $kind): string
 {
     $path = touch_display_file($kind);
@@ -3532,6 +3555,21 @@ function touch_display_write_file(string $path, string $content): void
     }
 }
 
+function touch_display_write_value(string $path, string $value): void
+{
+    if (function_exists('posix_geteuid') && posix_geteuid() === 0) {
+        if (@file_put_contents($path, $value) === false) {
+            throw new RuntimeException(basename($path) . ' 저장에 실패했습니다.');
+        }
+        return;
+    }
+
+    $result = sh(['/bin/sh', '-c', 'printf %s ' . escapeshellarg($value) . ' > ' . escapeshellarg($path)], true, 5);
+    if ($result['code'] !== 0) {
+        throw new RuntimeException(trim($result['out']) !== '' ? trim($result['out']) : basename($path) . ' 저장에 실패했습니다.');
+    }
+}
+
 function touch_display_active_config_lines(string $config): array
 {
     return array_values(array_filter(
@@ -3606,6 +3644,11 @@ function touch_display_status(): array
     $modes = is_readable($modesPath)
         ? array_values(array_filter(array_map('trim', file($modesPath, FILE_IGNORE_NEW_LINES) ?: [])))
         : [];
+    $backlightPath = touch_display_backlight_path();
+    $brightness = touch_display_read_int($backlightPath !== null ? $backlightPath . '/brightness' : null);
+    $actualBrightness = touch_display_read_int($backlightPath !== null ? $backlightPath . '/actual_brightness' : null);
+    $maxBrightness = touch_display_read_int($backlightPath !== null ? $backlightPath . '/max_brightness' : null);
+    $blPower = touch_display_read_int($backlightPath !== null ? $backlightPath . '/bl_power' : null);
 
     return [
         'connector' => 'DSI-1',
@@ -3618,6 +3661,16 @@ function touch_display_status(): array
         'current_mode' => $modes[0] ?? '800x480',
         'framebuffer' => is_dir('/sys/class/graphics/fb0') ? 'fb0' : '-',
         'touch_input' => trim((string)shell_exec("for e in /sys/class/input/event*/device/name; do cat \"\$e\" 2>/dev/null; done | grep -i 'ft5x06' | head -n 1")) ?: '-',
+        'backlight' => [
+            'available' => $backlightPath !== null,
+            'path' => $backlightPath,
+            'brightness' => $brightness,
+            'actual_brightness' => $actualBrightness,
+            'max_brightness' => $maxBrightness,
+            'percent' => $maxBrightness !== null && $maxBrightness > 0 && $brightness !== null ? round($brightness / $maxBrightness * 100, 1) : null,
+            'power' => $blPower,
+            'enabled' => $blPower === null || $blPower === 0,
+        ],
         'config' => [
             'display_auto_detect' => touch_display_config_flag($lines, 'display_auto_detect'),
             'manual_overlay' => (bool)$overlay['enabled'],
@@ -3637,6 +3690,36 @@ function touch_display_status(): array
     ];
 }
 
+function touch_display_set_runtime(array $input): array
+{
+    $backlightPath = touch_display_backlight_path();
+    if ($backlightPath === null) {
+        throw new RuntimeException('백라이트 제어 장치를 찾을 수 없습니다.');
+    }
+
+    $maxBrightness = touch_display_read_int($backlightPath . '/max_brightness') ?? 255;
+    $brightness = max(0, min($maxBrightness, (int)($input['brightness'] ?? $maxBrightness)));
+    $enabled = touch_display_bool($input['backlight_enabled'] ?? '1');
+
+    touch_display_write_value($backlightPath . '/brightness', (string)$brightness);
+    if (is_writable($backlightPath . '/bl_power') || is_readable($backlightPath . '/bl_power')) {
+        touch_display_write_value($backlightPath . '/bl_power', $enabled ? '0' : '4');
+    }
+
+    add_fan_action(
+        'touch_display_runtime',
+        null,
+        null,
+        'brightness=' . $brightness . '/' . $maxBrightness . ', backlight_enabled=' . ($enabled ? '1' : '0'),
+        true
+    );
+
+    return [
+        'reboot_required' => false,
+        'display' => touch_display_status(),
+    ];
+}
+
 function touch_display_comment_directives(string $config, array $patterns): string
 {
     $lines = preg_split('/\R/', $config) ?: [];
@@ -4043,6 +4126,25 @@ function control_api_dispatch(): void
             ]);
         }
 
+        if ($action === 'touch_display_runtime_save') {
+            $raw = (string)($_POST['runtime'] ?? '{}');
+            $runtime = json_decode($raw, true);
+            if (!is_array($runtime)) {
+                json_out([
+                    'ok' => false,
+                    'error' => 'bad_display_runtime',
+                ], 400);
+            }
+
+            $result = touch_display_set_runtime($runtime);
+            $data = collect_snapshot(false);
+            $data['touch_display_runtime_save'] = $result;
+            json_out([
+                'ok' => true,
+                'data' => $data,
+            ]);
+        }
+
         if ($action === 'fan') {
             $mode = (string)($_POST['mode'] ?? 'auto');
             $pwm = max(0, min(255, (int)($_POST['pwm'] ?? 120)));