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 nv40_get_intensity(struct backlight_device *bd)
  42 {
  43         struct drm_device *dev = bl_get_data(bd);
  44         int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
  45                                                                         >> 16;
  46
  47         return val;
  48 }
  49
  50 static int nv40_set_intensity(struct backlight_device *bd)
  51 {
  52         struct drm_device *dev = bl_get_data(bd);
  53         int val = bd->props.brightness;
  54         int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
  55
  56         nv_wr32(dev, NV40_PMC_BACKLIGHT,
  57                  (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
  58
  59         return 0;
  60 }
  61
  62 static const struct backlight_ops nv40_bl_ops = {
  63         .options = BL_CORE_SUSPENDRESUME,
  64         .get_brightness = nv40_get_intensity,
  65         .update_status = nv40_set_intensity,
  66 };
  67
  68 static int nv50_get_intensity(struct backlight_device *bd)
  69 {
  70         struct drm_device *dev = bl_get_data(bd);
  71
  72         return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
  73 }
  74
  75 static int nv50_set_intensity(struct backlight_device *bd)
  76 {
  77         struct drm_device *dev = bl_get_data(bd);
  78         int val = bd->props.brightness;
  79
  80         nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
  81                 val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
  82         return 0;
  83 }
  84
  85 static const struct backlight_ops nv50_bl_ops = {
  86         .options = BL_CORE_SUSPENDRESUME,
  87         .get_brightness = nv50_get_intensity,
  88         .update_status = nv50_set_intensity,
  89 };
  90
  91 static int nouveau_nv40_backlight_init(struct drm_device *dev)
  92 {
  93         struct backlight_properties props;
  94         struct drm_nouveau_private *dev_priv = dev->dev_private;
  95         struct backlight_device *bd;
  96
  97         if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
  98                 return 0;
  99
 100         memset(&props, 0, sizeof(struct backlight_properties));
 101         props.type = BACKLIGHT_RAW;
 102         props.max_brightness = 31;
 103         bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
 104                                        &nv40_bl_ops, &props);
 105         if (IS_ERR(bd))
 106                 return PTR_ERR(bd);
 107
 108         dev_priv->backlight = bd;
 109         bd->props.brightness = nv40_get_intensity(bd);
 110         backlight_update_status(bd);
 111
 112         return 0;
 113 }
 114
 115 static int nouveau_nv50_backlight_init(struct drm_device *dev)
 116 {
 117         struct backlight_properties props;
 118         struct drm_nouveau_private *dev_priv = dev->dev_private;
 119         struct backlight_device *bd;
 120
 121         if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
 122                 return 0;
 123
 124         memset(&props, 0, sizeof(struct backlight_properties));
 125         props.type = BACKLIGHT_RAW;
 126         props.max_brightness = 1025;
 127         bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
 128                                        &nv50_bl_ops, &props);
 129         if (IS_ERR(bd))
 130                 return PTR_ERR(bd);
 131
 132         dev_priv->backlight = bd;
 133         bd->props.brightness = nv50_get_intensity(bd);
 134         backlight_update_status(bd);
 135         return 0;
 136 }
 137
 138 int nouveau_backlight_init(struct drm_device *dev)
 139 {
 140         struct drm_nouveau_private *dev_priv = dev->dev_private;
 141
 142 #ifdef CONFIG_ACPI
 143         if (acpi_video_backlight_support()) {
 144                 NV_INFO(dev, "ACPI backlight interface available, "
 145                              "not registering our own\n");
 146                 return 0;
 147         }
 148 #endif
 149
 150         switch (dev_priv->card_type) {
 151         case NV_40:
 152                 return nouveau_nv40_backlight_init(dev);
 153         case NV_50:
 154                 return nouveau_nv50_backlight_init(dev);
 155         default:
 156                 break;
 157         }
 158
 159         return 0;
 160 }
 161
 162 void nouveau_backlight_exit(struct drm_device *dev)
 163 {
 164         struct drm_nouveau_private *dev_priv = dev->dev_private;
 165
 166         if (dev_priv->backlight) {
 167                 backlight_device_unregister(dev_priv->backlight);
 168                 dev_priv->backlight = NULL;
 169         }
 170 }