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 "nouveau_drm.h"
  37 #include "nouveau_reg.h"
  38 #include "nouveau_encoder.h"
  39
  40 static int
  41 nv40_get_intensity(struct backlight_device *bd)
  42 {
  43         struct nouveau_drm *drm = bl_get_data(bd);
  44         struct nouveau_device *device = nv_device(drm->device);
  45         int val = (nv_rd32(device, NV40_PMC_BACKLIGHT) &
  46                                    NV40_PMC_BACKLIGHT_MASK) >> 16;
  47
  48         return val;
  49 }
  50
  51 static int
  52 nv40_set_intensity(struct backlight_device *bd)
  53 {
  54         struct nouveau_drm *drm = bl_get_data(bd);
  55         struct nouveau_device *device = nv_device(drm->device);
  56         int val = bd->props.brightness;
  57         int reg = nv_rd32(device, NV40_PMC_BACKLIGHT);
  58
  59         nv_wr32(device, 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 nouveau_drm *drm = nouveau_drm(connector->dev);
  75         struct nouveau_device *device = nv_device(drm->device);
  76         struct backlight_properties props;
  77         struct backlight_device *bd;
  78
  79         if (!(nv_rd32(device, 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, drm,
  86                                        &nv40_bl_ops, &props);
  87         drm->backlight = bd;
  88         bd->props.brightness = nv40_get_intensity(bd);
  89         backlight_update_status(bd);
  90
  91         return 0;
  92 }
  93
  94 static int
  95 nv50_get_intensity(struct backlight_device *bd)
  96 {
  97         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
  98         struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
  99         struct nouveau_device *device = nv_device(drm->device);
 100         int or = nv_encoder->or;
 101         u32 div = 1025;
 102         u32 val;
 103
 104         val  = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
 105         val &= NV50_PDISP_SOR_PWM_CTL_VAL;
 106         return ((val * 100) + (div / 2)) / div;
 107 }
 108
 109 static int
 110 nv50_set_intensity(struct backlight_device *bd)
 111 {
 112         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 113         struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 114         struct nouveau_device *device = nv_device(drm->device);
 115         int or = nv_encoder->or;
 116         u32 div = 1025;
 117         u32 val = (bd->props.brightness * div) / 100;
 118
 119         nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
 120                         NV50_PDISP_SOR_PWM_CTL_NEW | val);
 121         return 0;
 122 }
 123
 124 static const struct backlight_ops nv50_bl_ops = {
 125         .options = BL_CORE_SUSPENDRESUME,
 126         .get_brightness = nv50_get_intensity,
 127         .update_status = nv50_set_intensity,
 128 };
 129
 130 static int
 131 nva3_get_intensity(struct backlight_device *bd)
 132 {
 133         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 134         struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 135         struct nouveau_device *device = nv_device(drm->device);
 136         int or = nv_encoder->or;
 137         u32 div, val;
 138
 139         div  = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 140         val  = nv_rd32(device, 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 nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 153         struct nouveau_device *device = nv_device(drm->device);
 154         int or = nv_encoder->or;
 155         u32 div, val;
 156
 157         div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 158         val = (bd->props.brightness * div) / 100;
 159         if (div) {
 160                 nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
 161                                 NV50_PDISP_SOR_PWM_CTL_NEW |
 162                                 NVA3_PDISP_SOR_PWM_CTL_UNK);
 163                 return 0;
 164         }
 165
 166         return -EINVAL;
 167 }
 168
 169 static const struct backlight_ops nva3_bl_ops = {
 170         .options = BL_CORE_SUSPENDRESUME,
 171         .get_brightness = nva3_get_intensity,
 172         .update_status = nva3_set_intensity,
 173 };
 174
 175 static int
 176 nv50_backlight_init(struct drm_connector *connector)
 177 {
 178         struct nouveau_drm *drm = nouveau_drm(connector->dev);
 179         struct nouveau_device *device = nv_device(drm->device);
 180         struct nouveau_encoder *nv_encoder;
 181         struct backlight_properties props;
 182         struct backlight_device *bd;
 183         const struct backlight_ops *ops;
 184
 185         nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
 186         if (!nv_encoder) {
 187                 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
 188                 if (!nv_encoder)
 189                         return -ENODEV;
 190         }
 191
 192         if (!nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
 193                 return 0;
 194
 195         if (device->chipset <= 0xa0 ||
 196             device->chipset == 0xaa ||
 197             device->chipset == 0xac)
 198                 ops = &nv50_bl_ops;
 199         else
 200                 ops = &nva3_bl_ops;
 201
 202         memset(&props, 0, sizeof(struct backlight_properties));
 203         props.type = BACKLIGHT_RAW;
 204         props.max_brightness = 100;
 205         bd = backlight_device_register("nv_backlight", &connector->kdev,
 206                                        nv_encoder, ops, &props);
 207         if (IS_ERR(bd))
 208                 return PTR_ERR(bd);
 209
 210         drm->backlight = bd;
 211         bd->props.brightness = bd->ops->get_brightness(bd);
 212         backlight_update_status(bd);
 213         return 0;
 214 }
 215
 216 int
 217 nouveau_backlight_init(struct drm_device *dev)
 218 {
 219         struct nouveau_drm *drm = nouveau_drm(dev);
 220         struct nouveau_device *device = nv_device(drm->device);
 221         struct drm_connector *connector;
 222
 223 #ifdef CONFIG_ACPI
 224         if (acpi_video_backlight_support()) {
 225                 NV_INFO(drm, "ACPI backlight interface available, "
 226                              "not registering our own\n");
 227                 return 0;
 228         }
 229 #endif
 230
 231         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 232                 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
 233                     connector->connector_type != DRM_MODE_CONNECTOR_eDP)
 234                         continue;
 235
 236                 switch (device->card_type) {
 237                 case NV_40:
 238                         return nv40_backlight_init(connector);
 239                 case NV_50:
 240                         return nv50_backlight_init(connector);
 241                 default:
 242                         break;
 243                 }
 244         }
 245
 246
 247         return 0;
 248 }
 249
 250 void
 251 nouveau_backlight_exit(struct drm_device *dev)
 252 {
 253         struct nouveau_drm *drm = nouveau_drm(dev);
 254
 255         if (drm->backlight) {
 256                 backlight_device_unregister(drm->backlight);
 257                 drm->backlight = NULL;
 258         }
 259 }