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 #include "nouveau_encoder.h"
  41
  42 static int
  43 nv40_get_intensity(struct backlight_device *bd)
  44 {
  45         struct drm_device *dev = bl_get_data(bd);
  46         int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
  47                                                                         >> 16;
  48
  49         return val;
  50 }
  51
  52 static int
  53 nv40_set_intensity(struct backlight_device *bd)
  54 {
  55         struct drm_device *dev = bl_get_data(bd);
  56         int val = bd->props.brightness;
  57         int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
  58
  59         nv_wr32(dev, NV40_PMC_BACKLIGHT,
  60                  (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
  61
  62         return 0;
  63 }
  64
  65 static const struct backlight_ops nv40_bl_ops = {
  66         .options = BL_CORE_SUSPENDRESUME,
  67         .get_brightness = nv40_get_intensity,
  68         .update_status = nv40_set_intensity,
  69 };
  70
  71 static int
  72 nv40_backlight_init(struct drm_connector *connector)
  73 {
  74         struct drm_device *dev = connector->dev;
  75         struct drm_nouveau_private *dev_priv = dev->dev_private;
  76         struct backlight_properties props;
  77         struct backlight_device *bd;
  78
  79         if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
  80                 return 0;
  81
  82         memset(&props, 0, sizeof(struct backlight_properties));
  83         props.type = BACKLIGHT_RAW;
  84         props.max_brightness = 31;
  85         bd = backlight_device_register("nv_backlight", &connector->kdev, dev,
  86                                        &nv40_bl_ops, &props);
  87         if (IS_ERR(bd))
  88                 return PTR_ERR(bd);
  89
  90         dev_priv->backlight = bd;
  91         bd->props.brightness = nv40_get_intensity(bd);
  92         backlight_update_status(bd);
  93
  94         return 0;
  95 }
  96
  97 static int
  98 nv50_get_intensity(struct backlight_device *bd)
  99 {
 100         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 101         struct drm_device *dev = nv_encoder->base.base.dev;
 102         int or = nv_encoder->or;
 103
 104         return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT + (or * 0x800));
 105 }
 106
 107 static int
 108 nv50_set_intensity(struct backlight_device *bd)
 109 {
 110         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 111         struct drm_device *dev = nv_encoder->base.base.dev;
 112         int val = bd->props.brightness;
 113         int or = nv_encoder->or;
 114
 115         nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT + (or * 0x800),
 116                 val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
 117         return 0;
 118 }
 119
 120 static const struct backlight_ops nv50_bl_ops = {
 121         .options = BL_CORE_SUSPENDRESUME,
 122         .get_brightness = nv50_get_intensity,
 123         .update_status = nv50_set_intensity,
 124 };
 125
 126 static int
 127 nv50_backlight_init(struct drm_connector *connector)
 128 {
 129         struct drm_device *dev = connector->dev;
 130         struct drm_nouveau_private *dev_priv = dev->dev_private;
 131         struct nouveau_encoder *nv_encoder;
 132         struct backlight_properties props;
 133         struct backlight_device *bd;
 134         int or;
 135
 136         nv_encoder = find_encoder(connector, OUTPUT_LVDS);
 137         if (!nv_encoder) {
 138                 nv_encoder = find_encoder(connector, OUTPUT_DP);
 139                 if (!nv_encoder)
 140                         return -ENODEV;
 141         }
 142
 143         or = nv_encoder->or;
 144
 145         if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT + (or * 0x800)))
 146                 return 0;
 147
 148         memset(&props, 0, sizeof(struct backlight_properties));
 149         props.type = BACKLIGHT_RAW;
 150         props.max_brightness = 1025;
 151         bd = backlight_device_register("nv_backlight", &connector->kdev,
 152                                        nv_encoder, &nv50_bl_ops, &props);
 153         if (IS_ERR(bd))
 154                 return PTR_ERR(bd);
 155
 156         dev_priv->backlight = bd;
 157         bd->props.brightness = nv50_get_intensity(bd);
 158         backlight_update_status(bd);
 159         return 0;
 160 }
 161
 162 int
 163 nouveau_backlight_init(struct drm_device *dev)
 164 {
 165         struct drm_nouveau_private *dev_priv = dev->dev_private;
 166         struct drm_connector *connector;
 167
 168 #ifdef CONFIG_ACPI
 169         if (acpi_video_backlight_support()) {
 170                 NV_INFO(dev, "ACPI backlight interface available, "
 171                              "not registering our own\n");
 172                 return 0;
 173         }
 174 #endif
 175
 176         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 177                 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
 178                     connector->connector_type != DRM_MODE_CONNECTOR_eDP)
 179                         continue;
 180
 181                 switch (dev_priv->card_type) {
 182                 case NV_40:
 183                         return nv40_backlight_init(connector);
 184                 case NV_50:
 185                         return nv50_backlight_init(connector);
 186                 default:
 187                         break;
 188                 }
 189         }
 190
 191
 192         return 0;
 193 }
 194
 195 void
 196 nouveau_backlight_exit(struct drm_device *dev)
 197 {
 198         struct drm_nouveau_private *dev_priv = dev->dev_private;
 199
 200         if (dev_priv->backlight) {
 201                 backlight_device_unregister(dev_priv->backlight);
 202                 dev_priv->backlight = NULL;
 203         }
 204 }