Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-5.4 / 57e148b6a975980944f4466ccb669b1d02dfc6a1 / . / drivers / gpu / drm / nouveau / nouveau_backlight.c
blob: 20564f8cb0ec45f2fa13f82aa69c6bea375600e5 [file] [log] [blame]
Ben Skeggs6ee73862009-12-11 19:24:15 +1000[diff] [blame]1/*
2 * Copyright (C) 2009 Red Hat <mjg@redhat.com>
3 *
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:
11 *
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.
15 *
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.
23 *
24 */
25
26/*
27 * Authors:
28 * Matthew Garrett <mjg@redhat.com>
29 *
30 * Register locations derived from NVClock by Roderick Colenbrander
31 */
32
33#include <linux/backlight.h>
34
35#include "drmP.h"
36#include "nouveau_drv.h"
37#include "nouveau_drm.h"
38#include "nouveau_reg.h"
39
40static int nv40_get_intensity(struct backlight_device *bd)
41{
42 struct drm_device *dev = bl_get_data(bd);
43 int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
44 >> 16;
45
46 return val;
47}
48
49static int nv40_set_intensity(struct backlight_device *bd)
50{
51 struct drm_device *dev = bl_get_data(bd);
52 int val = bd->props.brightness;
53 int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
54
55 nv_wr32(dev, NV40_PMC_BACKLIGHT,
56 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
57
58 return 0;
59}
60
61static struct backlight_ops nv40_bl_ops = {
62 .options = BL_CORE_SUSPENDRESUME,
63 .get_brightness = nv40_get_intensity,
64 .update_status = nv40_set_intensity,
65};
66
67static int nv50_get_intensity(struct backlight_device *bd)
68{
69 struct drm_device *dev = bl_get_data(bd);
70
71 return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
72}
73
74static int nv50_set_intensity(struct backlight_device *bd)
75{
76 struct drm_device *dev = bl_get_data(bd);
77 int val = bd->props.brightness;
78
79 nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
80 val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
81 return 0;
82}
83
84static struct backlight_ops nv50_bl_ops = {
85 .options = BL_CORE_SUSPENDRESUME,
86 .get_brightness = nv50_get_intensity,
87 .update_status = nv50_set_intensity,
88};
89
90static int nouveau_nv40_backlight_init(struct drm_device *dev)
91{
92 struct drm_nouveau_private *dev_priv = dev->dev_private;
93 struct backlight_device *bd;
94
95 if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
96 return 0;
97
98 bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
99 &nv40_bl_ops);
100 if (IS_ERR(bd))
101 return PTR_ERR(bd);
102
103 dev_priv->backlight = bd;
104 bd->props.max_brightness = 31;
105 bd->props.brightness = nv40_get_intensity(bd);
106 backlight_update_status(bd);
107
108 return 0;
109}
110
111static int nouveau_nv50_backlight_init(struct drm_device *dev)
112{
113 struct drm_nouveau_private *dev_priv = dev->dev_private;
114 struct backlight_device *bd;
115
116 if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
117 return 0;
118
119 bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
120 &nv50_bl_ops);
121 if (IS_ERR(bd))
122 return PTR_ERR(bd);
123
124 dev_priv->backlight = bd;
125 bd->props.max_brightness = 1025;
126 bd->props.brightness = nv50_get_intensity(bd);
127 backlight_update_status(bd);
128 return 0;
129}
130
131int nouveau_backlight_init(struct drm_device *dev)
132{
133 struct drm_nouveau_private *dev_priv = dev->dev_private;
134
135 switch (dev_priv->card_type) {
136 case NV_40:
137 return nouveau_nv40_backlight_init(dev);
138 case NV_50:
139 return nouveau_nv50_backlight_init(dev);
140 default:
141 break;
142 }
143
144 return 0;
145}
146
147void nouveau_backlight_exit(struct drm_device *dev)
148{
149 struct drm_nouveau_private *dev_priv = dev->dev_private;
150
151 if (dev_priv->backlight) {
152 backlight_device_unregister(dev_priv->backlight);
153 dev_priv->backlight = NULL;
154 }
155}