drivers/gpu/drm/nouveau/nouveau_backlight.c

   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 #include <linux/acpi.h>
  35
  36 #include "drmP.h"
  37 #include "nouveau_drv.h"
  38 #include "nouveau_drm.h"
  39 #include "nouveau_reg.h"
  40
  41 static int
  42 nv40_get_intensity(struct backlight_device *bd)
  43 {
  44         struct drm_device *dev = bl_get_data(bd);
  45         int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
  46                                                                         >> 16;
  47
  48         return val;
  49 }
  50
  51 static int
  52 nv40_set_intensity(struct backlight_device *bd)
  53 {
  54         struct drm_device *dev = bl_get_data(bd);
  55         int val = bd->props.brightness;
  56         int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
  57
  58         nv_wr32(dev, NV40_PMC_BACKLIGHT,
  59                  (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
  60
  61         return 0;
  62 }
  63
  64 static const struct backlight_ops nv40_bl_ops = {
  65         .options = BL_CORE_SUSPENDRESUME,
  66         .get_brightness = nv40_get_intensity,
  67         .update_status = nv40_set_intensity,
  68 };
  69
  70 static int
  71 nv40_backlight_init(struct drm_connector *connector)
  72 {
  73         struct drm_device *dev = connector->dev;
  74         struct drm_nouveau_private *dev_priv = dev->dev_private;
  75         struct backlight_properties props;
  76         struct backlight_device *bd;
  77
  78         if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
  79                 return 0;
  80
  81         memset(&props, 0, sizeof(struct backlight_properties));
  82         props.type = BACKLIGHT_RAW;
  83         props.max_brightness = 31;
  84         bd = backlight_device_register("nv_backlight", &connector->kdev, dev,
  85                                        &nv40_bl_ops, &props);
  86         if (IS_ERR(bd))
  87                 return PTR_ERR(bd);
  88
  89         dev_priv->backlight = bd;
  90         bd->props.brightness = nv40_get_intensity(bd);
  91         backlight_update_status(bd);
  92
  93         return 0;
  94 }
  95
  96 static int
  97 nv50_get_intensity(struct backlight_device *bd)
  98 {
  99         struct drm_device *dev = bl_get_data(bd);
 100
 101         return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
 102 }
 103
 104 static int
 105 nv50_set_intensity(struct backlight_device *bd)
 106 {
 107         struct drm_device *dev = bl_get_data(bd);
 108         int val = bd->props.brightness;
 109
 110         nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
 111                 val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
 112         return 0;
 113 }
 114
 115 static const struct backlight_ops nv50_bl_ops = {
 116         .options = BL_CORE_SUSPENDRESUME,
 117         .get_brightness = nv50_get_intensity,
 118         .update_status = nv50_set_intensity,
 119 };
 120
 121 static int
 122 nv50_backlight_init(struct drm_connector *connector)
 123 {
 124         struct drm_device *dev = connector->dev;
 125         struct drm_nouveau_private *dev_priv = dev->dev_private;
 126         struct backlight_properties props;
 127         struct backlight_device *bd;
 128
 129         if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
 130                 return 0;
 131
 132         memset(&props, 0, sizeof(struct backlight_properties));
 133         props.type = BACKLIGHT_RAW;
 134         props.max_brightness = 1025;
 135         bd = backlight_device_register("nv_backlight", &connector->kdev, dev,
 136                                        &nv50_bl_ops, &props);
 137         if (IS_ERR(bd))
 138                 return PTR_ERR(bd);
 139
 140         dev_priv->backlight = bd;
 141         bd->props.brightness = nv50_get_intensity(bd);
 142         backlight_update_status(bd);
 143         return 0;
 144 }
 145
 146 int
 147 nouveau_backlight_init(struct drm_connector *connector)
 148 {
 149         struct drm_device *dev = connector->dev;
 150         struct drm_nouveau_private *dev_priv = dev->dev_private;
 151
 152 #ifdef CONFIG_ACPI
 153         if (acpi_video_backlight_support()) {
 154                 NV_INFO(dev, "ACPI backlight interface available, "
 155                              "not registering our own\n");
 156                 return 0;
 157         }
 158 #endif
 159
 160         switch (dev_priv->card_type) {
 161         case NV_40:
 162                 return nv40_backlight_init(connector);
 163         case NV_50:
 164                 return nv50_backlight_init(connector);
 165         default:
 166                 break;
 167         }
 168
 169         return 0;
 170 }
 171
 172 void
 173 nouveau_backlight_exit(struct drm_connector *connector)
 174 {
 175         struct drm_device *dev = connector->dev;
 176         struct drm_nouveau_private *dev_priv = dev->dev_private;
 177
 178         if (dev_priv->backlight) {
 179                 backlight_device_unregister(dev_priv->backlight);
 180                 dev_priv->backlight = NULL;
 181         }
 182 }