1 files changed, 93 insertions, 0 deletions

diff --git a/linux-core/nouveau_backlight.c b/linux-core/nouveau_backlight.c
index 1b36f3cf..3a68d924 100644
--- a/linux-core/nouveau_backlight.c
+++ b/linux-core/nouveau_backlight.c
@@ -27,6 +27,10 @@
  * Authors:
  *  Matthew Garrett <mjg@redhat.com>
  *
+ *  PowerPC specific stuff:
+ *  Danny Tholen <moondrake@gmail.com>
+ *  (mainly based on info from nvidiafb)
+ *
  * Register locations derived from NVClock by Roderick Colenbrander
  */
 
@@ -36,9 +40,54 @@
 #include "nouveau_drv.h"
 #include "nouveau_drm.h"
 #include "nouveau_reg.h"
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
 
 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23))
 
+#ifdef CONFIG_PMAC_BACKLIGHT
+static int ppc_get_intensity(struct backlight_device *bd)
+{
+	struct drm_device *dev = bl_get_data(bd);
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	int raw_val = (NV_READ(NV_PBUS_DEBUG_DUALHEAD_CTL) & 0x7fff0000) >> 16;
+	int min_brightness = bd->props.max_brightness / 3;
+	int intensity = raw_val - min_brightness;
+
+	return (intensity < 0 ? 0 : intensity);
+}
+
+static int ppc_set_intensity(struct backlight_device *bd)
+{
+	struct drm_device *dev = bl_get_data(bd);
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	int val = bd->props.brightness;
+	int min_brightness = bd->props.max_brightness / 3;
+	int dh_ctl = NV_READ(NV_PBUS_DEBUG_DUALHEAD_CTL) & 0x0000ffff;
+	int gpio_ext = NV_READ(NV_PCRTC_GPIO_EXT) & ~0x3;
+
+	if (val > 0) {
+		dh_ctl |= (1 << 31); /* backlight bit on */
+		dh_ctl |= (val + min_brightness) << 16;
+		gpio_ext |= 0x1;
+	}
+
+	NV_WRITE(NV_PBUS_DEBUG_DUALHEAD_CTL, dh_ctl);
+	NV_WRITE(NV_PCRTC_GPIO_EXT, gpio_ext);
+
+	return 0;
+}
+
+static struct backlight_ops ppc_bl_ops = {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,29))
+	.options = BL_CORE_SUSPENDRESUME,
+#endif
+	.get_brightness = ppc_get_intensity,
+	.update_status = ppc_set_intensity,
+};
+#endif /* CONFIG_PMAC_BACKLIGHT */
+
 static int nv40_get_intensity(struct backlight_device *bd)
 {
 	struct drm_device *dev = bl_get_data(bd);
@@ -96,6 +145,45 @@ static struct backlight_ops nv50_bl_ops = {
 	.update_status = nv50_set_intensity,
 };
 
+#ifdef CONFIG_PMAC_BACKLIGHT
+static int nouveau_ppc_backlight_init(struct drm_device *dev)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct backlight_device *bd;
+	int max_brightness;
+
+	if (!machine_is(powermac) ||
+	    !pmac_has_backlight_type("mnca"))
+		return -ENODEV;
+
+	/* "nv_bl0", some old powerpc userland tools rely on this */
+	bd = backlight_device_register("nv_bl0", &dev->pdev->dev, dev,
+				       &ppc_bl_ops);
+	if (IS_ERR(bd))
+		return PTR_ERR(bd);
+
+	dev_priv->backlight = bd;
+
+	/* the least significant 15 bits of NV_PBUS_DEBUG_DUALHEAD_CTL
+	 * set the maximum backlight level, OF sets it to 0x535 on my
+	 * powerbook. however, posting the card sets this to 0x7FFF.
+	 * Below 25% the blacklight turns off.
+	 *
+	 * NOTE: pbbuttonsd limits brightness values < 255, and thus
+	 * will not work well with this.
+	 */
+
+	/* FIXME: do we want to fix this reg to 0x535 for consistency? */
+	max_brightness = NV_READ(NV_PBUS_DEBUG_DUALHEAD_CTL) & 0x0000ffff;
+	/* lose (bottom) 25% of range */
+	bd->props.max_brightness = (max_brightness * 3) / 4;
+	bd->props.brightness = ppc_get_intensity(bd);
+	backlight_update_status(bd);
+
+	return 0;
+}
+#endif
+
 static int nouveau_nv40_backlight_init(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
@@ -142,6 +230,11 @@ int nouveau_backlight_init(struct drm_device *dev)
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 
 	switch (dev_priv->card_type) {
+#ifdef CONFIG_PMAC_BACKLIGHT
+	case NV_17:
+	case NV_30:
+		return nouveau_ppc_backlight_init(dev);
+#endif
 	case NV_40:
 	case NV_44:
 		return nouveau_nv40_backlight_init(dev);