led: Add flash LED type

Camera flashes are also exported via the LED subsystem. We use a separate LED type so they're not picked by default. We don't use them as fallbacks either.
2024-06-15 11:14:40 +02:00
parent e16dc3cdab
commit e47ce8e09e
7 changed files with 272 additions and 2 deletions
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2024 The Phosh Developers
+ *
+ * SPDX-License-Identifier: GPL-3.0+
+ * Author: Guido Günther <agx@sigxcpu.org>
+ *
+ * See Documentation/ABI/testing/sysfs-class-led-trigger-pattern
+ */
+
+#define G_LOG_DOMAIN "fbd-dev-led-flash"
+
+#include "fbd-dev-led-priv.h"
+#include "fbd-dev-led-flash.h"
+#include "fbd-enums.h"
+#include "fbd-udev.h"
+
+#include <gio/gio.h>
+
+/**
+ * fbd-dev-led-flash:
+ *
+ * The LED of a camera flash
+ */
+typedef struct _FbdDevLedFlash {
+  FbdDevLed parent;
+} FbdDevLedFlash;
+
+
+G_DEFINE_TYPE (FbdDevLedFlash, fbd_dev_led_flash, FBD_TYPE_DEV_LED)
+
+
+static gboolean
+fbd_dev_led_flash_probe (FbdDevLed *led, GError **error)
+{
+  GUdevDevice *dev = fbd_dev_led_get_device (led);
+  const gchar *name, *path;
+  guint max_brightness;
+
+  name = g_udev_device_get_name (dev);
+  if (!g_udev_device_get_sysfs_attr (dev, "flash_strobe") ||
+      !g_udev_device_get_sysfs_attr (dev, "flash_brightness")) {
+    g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED, "%s is no flash LED", name);
+    return FALSE;
+  }
+
+  max_brightness = g_udev_device_get_sysfs_attr_as_int (dev, LED_MAX_BRIGHTNESS_ATTR);
+  if (!max_brightness) {
+    g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED, "%s has no max_brightness", name);
+    return FALSE;
+  }
+
+  fbd_dev_led_set_max_brightness (led, max_brightness);
+  fbd_dev_led_set_supported_color (led, FBD_FEEDBACK_LED_COLOR_FLASH);
+
+  path = g_udev_device_get_sysfs_path (dev);
+  g_debug ("LED at '%s' usable as flash", path);
+
+  return TRUE;
+}
+
+
+static void
+fbd_dev_led_flash_class_init (FbdDevLedFlashClass *klass)
+{
+  FbdDevLedClass *fbd_dev_led_class = FBD_DEV_LED_CLASS (klass);
+
+  fbd_dev_led_class->probe = fbd_dev_led_flash_probe;
+}
+
+
+static void
+fbd_dev_led_flash_init (FbdDevLedFlash *self)
+{
+}
+
+
+FbdDevLed *
+fbd_dev_led_flash_new (GUdevDevice *dev, GError **err)
+{
+  return g_initable_new (FBD_TYPE_DEV_LED_FLASH, NULL, err, "dev", dev, NULL);
+}