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 <drm/drmP.h>
  37 #include "nouveau_drv.h"
  38 #include <drm/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         u32 div = 1025;
 104         u32 val;
 105
 106         val  = nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(or));
 107         val &= NV50_PDISP_SOR_PWM_CTL_VAL;
 108         return ((val * 100) + (div / 2)) / div;
 109 }
 110
 111 static int
 112 nv50_set_intensity(struct backlight_device *bd)
 113 {
 114         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 115         struct drm_device *dev = nv_encoder->base.base.dev;
 116         int or = nv_encoder->or;
 117         u32 div = 1025;
 118         u32 val = (bd->props.brightness * div) / 100;
 119
 120         nv_wr32(dev, NV50_PDISP_SOR_PWM_CTL(or),
 121                      NV50_PDISP_SOR_PWM_CTL_NEW | val);
 122         return 0;
 123 }
 124
 125 static const struct backlight_ops nv50_bl_ops = {
 126         .options = BL_CORE_SUSPENDRESUME,
 127         .get_brightness = nv50_get_intensity,
 128         .update_status = nv50_set_intensity,
 129 };
 130
 131 static int
 132 nva3_get_intensity(struct backlight_device *bd)
 133 {
 134         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 135         struct drm_device *dev = nv_encoder->base.base.dev;
 136         int or = nv_encoder->or;
 137         u32 div, val;
 138
 139         div  = nv_rd32(dev, NV50_PDISP_SOR_PWM_DIV(or));
 140         val  = nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(or));
 141         val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
 142         if (div && div >= val)
 143                 return ((val * 100) + (div / 2)) / div;
 144
 145         return 100;
 146 }
 147
 148 static int
 149 nva3_set_intensity(struct backlight_device *bd)
 150 {
 151         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 152         struct drm_device *dev = nv_encoder->base.base.dev;
 153         int or = nv_encoder->or;
 154         u32 div, val;
 155
 156         div = nv_rd32(dev, NV50_PDISP_SOR_PWM_DIV(or));
 157         val = (bd->props.brightness * div) / 100;
 158         if (div) {
 159                 nv_wr32(dev, NV50_PDISP_SOR_PWM_CTL(or), val |
 160                              NV50_PDISP_SOR_PWM_CTL_NEW |
 161                              NVA3_PDISP_SOR_PWM_CTL_UNK);
 162                 return 0;
 163         }
 164
 165         return -EINVAL;
 166 }
 167
 168 static const struct backlight_ops nva3_bl_ops = {
 169         .options = BL_CORE_SUSPENDRESUME,
 170         .get_brightness = nva3_get_intensity,
 171         .update_status = nva3_set_intensity,
 172 };
 173
 174 static int
 175 nv50_backlight_init(struct drm_connector *connector)
 176 {
 177         struct drm_device *dev = connector->dev;
 178         struct drm_nouveau_private *dev_priv = dev->dev_private;
 179         struct nouveau_encoder *nv_encoder;
 180         struct backlight_properties props;
 181         struct backlight_device *bd;
 182         const struct backlight_ops *ops;
 183
 184         nv_encoder = find_encoder(connector, OUTPUT_LVDS);
 185         if (!nv_encoder) {
 186                 nv_encoder = find_encoder(connector, OUTPUT_DP);
 187                 if (!nv_encoder)
 188                         return -ENODEV;
 189         }
 190
 191         if (!nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
 192                 return 0;
 193
 194         if (dev_priv->chipset <= 0xa0 ||
 195             dev_priv->chipset == 0xaa ||
 196             dev_priv->chipset == 0xac)
 197                 ops = &nv50_bl_ops;
 198         else
 199                 ops = &nva3_bl_ops;
 200
 201         memset(&props, 0, sizeof(struct backlight_properties));
 202         props.type = BACKLIGHT_RAW;
 203         props.max_brightness = 100;
 204         bd = backlight_device_register("nv_backlight", &connector->kdev,
 205                                        nv_encoder, ops, &props);
 206         if (IS_ERR(bd))
 207                 return PTR_ERR(bd);
 208
 209         dev_priv->backlight = bd;
 210         bd->props.brightness = bd->ops->get_brightness(bd);
 211         backlight_update_status(bd);
 212         return 0;
 213 }
 214
 215 int
 216 nouveau_backlight_init(struct drm_device *dev)
 217 {
 218         struct drm_nouveau_private *dev_priv = dev->dev_private;
 219         struct drm_connector *connector;
 220
 221 #ifdef CONFIG_ACPI
 222         if (acpi_video_backlight_support()) {
 223                 NV_INFO(dev, "ACPI backlight interface available, "
 224                              "not registering our own\n");
 225                 return 0;
 226         }
 227 #endif
 228
 229         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 230                 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
 231                     connector->connector_type != DRM_MODE_CONNECTOR_eDP)
 232                         continue;
 233
 234                 switch (dev_priv->card_type) {
 235                 case NV_40:
 236                         return nv40_backlight_init(connector);
 237                 case NV_50:
 238                         return nv50_backlight_init(connector);
 239                 default:
 240                         break;
 241                 }
 242         }
 243
 244
 245         return 0;
 246 }
 247
 248 void
 249 nouveau_backlight_exit(struct drm_device *dev)
 250 {
 251         struct drm_nouveau_private *dev_priv = dev->dev_private;
 252
 253         if (dev_priv->backlight) {
 254                 backlight_device_unregister(dev_priv->backlight);
 255                 dev_priv->backlight = NULL;
 256         }
 257 }