1 files changed, 264 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 0000000..2ffad21
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -0,0 +1,264 @@
+/*
+ * 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 <linux/acpi.h>
+
+#include "nouveau_drm.h"
+#include "nouveau_reg.h"
+#include "nouveau_encoder.h"
+
+static int
+nv40_get_intensity(struct backlight_device *bd)
+{
+	struct nouveau_drm *drm = bl_get_data(bd);
+	struct nouveau_device *device = nv_device(drm->device);
+	int val = (nv_rd32(device, NV40_PMC_BACKLIGHT) &
+				   NV40_PMC_BACKLIGHT_MASK) >> 16;
+
+	return val;
+}
+
+static int
+nv40_set_intensity(struct backlight_device *bd)
+{
+	struct nouveau_drm *drm = bl_get_data(bd);
+	struct nouveau_device *device = nv_device(drm->device);
+	int val = bd->props.brightness;
+	int reg = nv_rd32(device, NV40_PMC_BACKLIGHT);
+
+	nv_wr32(device, NV40_PMC_BACKLIGHT,
+		 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
+
+	return 0;
+}
+
+static const struct backlight_ops nv40_bl_ops = {
+	.options = BL_CORE_SUSPENDRESUME,
+	.get_brightness = nv40_get_intensity,
+	.update_status = nv40_set_intensity,
+};
+
+static int
+nv40_backlight_init(struct drm_connector *connector)
+{
+	struct nouveau_drm *drm = nouveau_drm(connector->dev);
+	struct nouveau_device *device = nv_device(drm->device);
+	struct backlight_properties props;
+	struct backlight_device *bd;
+
+	if (!(nv_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
+		return 0;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_RAW;
+	props.max_brightness = 31;
+	bd = backlight_device_register("nv_backlight", &connector->kdev, drm,
+				       &nv40_bl_ops, &props);
+	if (IS_ERR(bd))
+		return PTR_ERR(bd);
+	drm->backlight = bd;
+	bd->props.brightness = nv40_get_intensity(bd);
+	backlight_update_status(bd);
+
+	return 0;
+}
+
+static int
+nv50_get_intensity(struct backlight_device *bd)
+{
+	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
+	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
+	struct nouveau_device *device = nv_device(drm->device);
+	int or = nv_encoder->or;
+	u32 div = 1025;
+	u32 val;
+
+	val  = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
+	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
+	return ((val * 100) + (div / 2)) / div;
+}
+
+static int
+nv50_set_intensity(struct backlight_device *bd)
+{
+	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
+	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
+	struct nouveau_device *device = nv_device(drm->device);
+	int or = nv_encoder->or;
+	u32 div = 1025;
+	u32 val = (bd->props.brightness * div) / 100;
+
+	nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
+			NV50_PDISP_SOR_PWM_CTL_NEW | val);
+	return 0;
+}
+
+static const struct backlight_ops nv50_bl_ops = {
+	.options = BL_CORE_SUSPENDRESUME,
+	.get_brightness = nv50_get_intensity,
+	.update_status = nv50_set_intensity,
+};
+
+static int
+nva3_get_intensity(struct backlight_device *bd)
+{
+	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
+	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
+	struct nouveau_device *device = nv_device(drm->device);
+	int or = nv_encoder->or;
+	u32 div, val;
+
+	div  = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
+	val  = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
+	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
+	if (div && div >= val)
+		return ((val * 100) + (div / 2)) / div;
+
+	return 100;
+}
+
+static int
+nva3_set_intensity(struct backlight_device *bd)
+{
+	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
+	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
+	struct nouveau_device *device = nv_device(drm->device);
+	int or = nv_encoder->or;
+	u32 div, val;
+
+	div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
+	val = (bd->props.brightness * div) / 100;
+	if (div) {
+		nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
+				NV50_PDISP_SOR_PWM_CTL_NEW |
+				NVA3_PDISP_SOR_PWM_CTL_UNK);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static const struct backlight_ops nva3_bl_ops = {
+	.options = BL_CORE_SUSPENDRESUME,
+	.get_brightness = nva3_get_intensity,
+	.update_status = nva3_set_intensity,
+};
+
+static int
+nv50_backlight_init(struct drm_connector *connector)
+{
+	struct nouveau_drm *drm = nouveau_drm(connector->dev);
+	struct nouveau_device *device = nv_device(drm->device);
+	struct nouveau_encoder *nv_encoder;
+	struct backlight_properties props;
+	struct backlight_device *bd;
+	const struct backlight_ops *ops;
+
+	nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
+	if (!nv_encoder) {
+		nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
+		if (!nv_encoder)
+			return -ENODEV;
+	}
+
+	if (!nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
+		return 0;
+
+	if (device->chipset <= 0xa0 ||
+	    device->chipset == 0xaa ||
+	    device->chipset == 0xac)
+		ops = &nv50_bl_ops;
+	else
+		ops = &nva3_bl_ops;
+
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.type = BACKLIGHT_RAW;
+	props.max_brightness = 100;
+	bd = backlight_device_register("nv_backlight", &connector->kdev,
+				       nv_encoder, ops, &props);
+	if (IS_ERR(bd))
+		return PTR_ERR(bd);
+
+	drm->backlight = bd;
+	bd->props.brightness = bd->ops->get_brightness(bd);
+	backlight_update_status(bd);
+	return 0;
+}
+
+int
+nouveau_backlight_init(struct drm_device *dev)
+{
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nouveau_device *device = nv_device(drm->device);
+	struct drm_connector *connector;
+
+#ifdef CONFIG_ACPI
+	if (acpi_video_backlight_support()) {
+		NV_INFO(drm, "ACPI backlight interface available, "
+			     "not registering our own\n");
+		return 0;
+	}
+#endif
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
+		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
+			continue;
+
+		switch (device->card_type) {
+		case NV_40:
+			return nv40_backlight_init(connector);
+		case NV_50:
+		case NV_C0:
+		case NV_D0:
+		case NV_E0:
+			return nv50_backlight_init(connector);
+		default:
+			break;
+		}
+	}
+
+
+	return 0;
+}
+
+void
+nouveau_backlight_exit(struct drm_device *dev)
+{
+	struct nouveau_drm *drm = nouveau_drm(dev);
+
+	if (drm->backlight) {
+		backlight_device_unregister(drm->backlight);
+		drm->backlight = NULL;
+	}
+}