Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / shmobile / shmob_drm_backlight.c

diff --git a/kernel/drivers/gpu/drm/shmobile/shmob_drm_backlight.c b/kernel/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
new file mode 100644 (file)
index 0000000..33dd41a
--- /dev/null
+++ b/kernel/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
@@ -0,0 +1,90 @@
+/*
+ * shmob_drm_backlight.c  --  SH Mobile DRM Backlight
+ *
+ * Copyright (C) 2012 Renesas Electronics Corporation
+ *
+ * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * 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.
+ */
+
+#include <linux/backlight.h>
+
+#include "shmob_drm_backlight.h"
+#include "shmob_drm_crtc.h"
+#include "shmob_drm_drv.h"
+
+static int shmob_drm_backlight_update(struct backlight_device *bdev)
+{
+       struct shmob_drm_connector *scon = bl_get_data(bdev);
+       struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
+       const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
+       int brightness = bdev->props.brightness;
+
+       if (bdev->props.power != FB_BLANK_UNBLANK ||
+           bdev->props.state & BL_CORE_SUSPENDED)
+               brightness = 0;
+
+       return bdata->set_brightness(brightness);
+}
+
+static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
+{
+       struct shmob_drm_connector *scon = bl_get_data(bdev);
+       struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
+       const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
+
+       return bdata->get_brightness();
+}
+
+static const struct backlight_ops shmob_drm_backlight_ops = {
+       .options        = BL_CORE_SUSPENDRESUME,
+       .update_status  = shmob_drm_backlight_update,
+       .get_brightness = shmob_drm_backlight_get_brightness,
+};
+
+void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
+{
+       if (scon->backlight == NULL)
+               return;
+
+       scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
+                                    ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
+       backlight_update_status(scon->backlight);
+}
+
+int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
+{
+       struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
+       const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
+       struct drm_connector *connector = &scon->connector;
+       struct drm_device *dev = connector->dev;
+       struct backlight_device *backlight;
+
+       if (!bdata->max_brightness)
+               return 0;
+
+       backlight = backlight_device_register(bdata->name, dev->dev, scon,
+                                             &shmob_drm_backlight_ops, NULL);
+       if (IS_ERR(backlight)) {
+               dev_err(dev->dev, "unable to register backlight device: %ld\n",
+                       PTR_ERR(backlight));
+               return PTR_ERR(backlight);
+       }
+
+       backlight->props.max_brightness = bdata->max_brightness;
+       backlight->props.brightness = bdata->max_brightness;
+       backlight->props.power = FB_BLANK_POWERDOWN;
+       backlight_update_status(backlight);
+
+       scon->backlight = backlight;
+       return 0;
+}
+
+void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
+{
+       backlight_device_unregister(scon->backlight);
+}