1 files changed, 159 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
new file mode 100644
index 000000000000..406228f4a2a0
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2009 Red Hat <mjg@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/*
+ * Authors:
+ *  Matthew Garrett <mjg@redhat.com>
+ *
+ * Register locations derived from NVClock by Roderick Colenbrander
+ */
+
+#include <linux/backlight.h>
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_drm.h"
+#include "nouveau_reg.h"
+
+static int nv40_get_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+        int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
+                                                                        >> 16;
+
+        return val;
+}
+
+static int nv40_set_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+        int val = bd->props.brightness;
+        int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
+
+        nv_wr32(dev, NV40_PMC_BACKLIGHT,
+                 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
+
+        return 0;
+}
+
+static struct backlight_ops nv40_bl_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .get_brightness = nv40_get_intensity,
+        .update_status = nv40_set_intensity,
+};
+
+static int nv50_get_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+
+        return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
+}
+
+static int nv50_set_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+        int val = bd->props.brightness;
+
+        nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
+                val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
+        return 0;
+}
+
+static struct backlight_ops nv50_bl_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .get_brightness = nv50_get_intensity,
+        .update_status = nv50_set_intensity,
+};
+
+static int nouveau_nv40_backlight_init(struct drm_device *dev)
+{
+        struct backlight_properties props;
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct backlight_device *bd;
+
+        if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
+                return 0;
+
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = 31;
+        bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
+                                       &nv40_bl_ops, &props);
+        if (IS_ERR(bd))
+                return PTR_ERR(bd);
+
+        dev_priv->backlight = bd;
+        bd->props.brightness = nv40_get_intensity(bd);
+        backlight_update_status(bd);
+
+        return 0;
+}
+
+static int nouveau_nv50_backlight_init(struct drm_device *dev)
+{
+        struct backlight_properties props;
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct backlight_device *bd;
+
+        if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
+                return 0;
+
+        memset(&props, 0, sizeof(struct backlight_properties));
+        props.max_brightness = 1025;
+        bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
+                                       &nv50_bl_ops, &props);
+        if (IS_ERR(bd))
+                return PTR_ERR(bd);
+
+        dev_priv->backlight = bd;
+        bd->props.brightness = nv50_get_intensity(bd);
+        backlight_update_status(bd);
+        return 0;
+}
+
+int nouveau_backlight_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+        switch (dev_priv->card_type) {
+        case NV_40:
+                return nouveau_nv40_backlight_init(dev);
+        case NV_50:
+                return nouveau_nv50_backlight_init(dev);
+        default:
+                break;
+        }
+
+        return 0;
+}
+
+void nouveau_backlight_exit(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+        if (dev_priv->backlight) {
+                backlight_device_unregister(dev_priv->backlight);
+                dev_priv->backlight = NULL;
+        }
+}