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
  35 #include "drmP.h"
  36 #include "nouveau_drv.h"
  37 #include "nouveau_drm.h"
  38 #include "nouveau_reg.h"
  39
  40 static 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
  49 static 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
  61 static 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
  67 static 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
  74 static 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
  84 static 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
  90 static int nouveau_nv40_backlight_init(struct drm_device *dev)
  91 {
  92         struct backlight_properties props;
  93         struct drm_nouveau_private *dev_priv = dev->dev_private;
  94         struct backlight_device *bd;
  95
  96         if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
  97                 return 0;
  98
  99         memset(&props, 0, sizeof(struct backlight_properties));
 100         props.max_brightness = 31;
 101         bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
 102                                        &nv40_bl_ops, &props);
 103         if (IS_ERR(bd))
 104                 return PTR_ERR(bd);
 105
 106         dev_priv->backlight = bd;
 107         bd->props.brightness = nv40_get_intensity(bd);
 108         backlight_update_status(bd);
 109
 110         return 0;
 111 }
 112
 113 static int nouveau_nv50_backlight_init(struct drm_device *dev)
 114 {
 115         struct backlight_properties props;
 116         struct drm_nouveau_private *dev_priv = dev->dev_private;
 117         struct backlight_device *bd;
 118
 119         if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
 120                 return 0;
 121
 122         memset(&props, 0, sizeof(struct backlight_properties));
 123         props.max_brightness = 1025;
 124         bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
 125                                        &nv50_bl_ops, &props);
 126         if (IS_ERR(bd))
 127                 return PTR_ERR(bd);
 128
 129         dev_priv->backlight = bd;
 130         bd->props.brightness = nv50_get_intensity(bd);
 131         backlight_update_status(bd);
 132         return 0;
 133 }
 134
 135 int nouveau_backlight_init(struct drm_device *dev)
 136 {
 137         struct drm_nouveau_private *dev_priv = dev->dev_private;
 138
 139         switch (dev_priv->card_type) {
 140         case NV_40:
 141                 return nouveau_nv40_backlight_init(dev);
 142         case NV_50:
 143                 return nouveau_nv50_backlight_init(dev);
 144         default:
 145                 break;
 146         }
 147
 148         return 0;
 149 }
 150
 151 void nouveau_backlight_exit(struct drm_device *dev)
 152 {
 153         struct drm_nouveau_private *dev_priv = dev->dev_private;
 154
 155         if (dev_priv->backlight) {
 156                 backlight_device_unregister(dev_priv->backlight);
 157                 dev_priv->backlight = NULL;
 158         }
 159 }