2 * Copyright (C) 2009 Red Hat <mjg@redhat.com>
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
12 * The above copyright notice and this permission notice (including the
13 * next paragraph) shall be included in all copies or substantial
14 * portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 * Matthew Garrett <mjg@redhat.com>
30 * Register locations derived from NVClock by Roderick Colenbrander
33 #include <linux/backlight.h>
34 #include <linux/acpi.h>
37 #include "nouveau_drv.h"
38 #include "nouveau_drm.h"
39 #include "nouveau_reg.h"
41 static int nv40_get_intensity(struct backlight_device *bd)
43 struct drm_device *dev = bl_get_data(bd);
44 int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
50 static int nv40_set_intensity(struct backlight_device *bd)
52 struct drm_device *dev = bl_get_data(bd);
53 int val = bd->props.brightness;
54 int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
56 nv_wr32(dev, NV40_PMC_BACKLIGHT,
57 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
62 static struct backlight_ops nv40_bl_ops = {
63 .options = BL_CORE_SUSPENDRESUME,
64 .get_brightness = nv40_get_intensity,
65 .update_status = nv40_set_intensity,
68 static int nv50_get_intensity(struct backlight_device *bd)
70 struct drm_device *dev = bl_get_data(bd);
72 return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
75 static int nv50_set_intensity(struct backlight_device *bd)
77 struct drm_device *dev = bl_get_data(bd);
78 int val = bd->props.brightness;
80 nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
81 val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
85 static struct backlight_ops nv50_bl_ops = {
86 .options = BL_CORE_SUSPENDRESUME,
87 .get_brightness = nv50_get_intensity,
88 .update_status = nv50_set_intensity,
91 static int nouveau_nv40_backlight_init(struct drm_device *dev)
93 struct backlight_properties props;
94 struct drm_nouveau_private *dev_priv = dev->dev_private;
95 struct backlight_device *bd;
97 if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
100 memset(&props, 0, sizeof(struct backlight_properties));
101 props.max_brightness = 31;
102 bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
103 &nv40_bl_ops, &props);
107 dev_priv->backlight = bd;
108 bd->props.brightness = nv40_get_intensity(bd);
109 backlight_update_status(bd);
114 static int nouveau_nv50_backlight_init(struct drm_device *dev)
116 struct backlight_properties props;
117 struct drm_nouveau_private *dev_priv = dev->dev_private;
118 struct backlight_device *bd;
120 if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
123 memset(&props, 0, sizeof(struct backlight_properties));
124 props.max_brightness = 1025;
125 bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
126 &nv50_bl_ops, &props);
130 dev_priv->backlight = bd;
131 bd->props.brightness = nv50_get_intensity(bd);
132 backlight_update_status(bd);
136 int nouveau_backlight_init(struct drm_device *dev)
138 struct drm_nouveau_private *dev_priv = dev->dev_private;
141 if (acpi_video_backlight_support()) {
142 NV_INFO(dev, "ACPI backlight interface available, "
143 "not registering our own\n");
148 switch (dev_priv->card_type) {
150 return nouveau_nv40_backlight_init(dev);
152 return nouveau_nv50_backlight_init(dev);
160 void nouveau_backlight_exit(struct drm_device *dev)
162 struct drm_nouveau_private *dev_priv = dev->dev_private;
164 if (dev_priv->backlight) {
165 backlight_device_unregister(dev_priv->backlight);
166 dev_priv->backlight = NULL;