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         if (IS_ERR(bd))
  88                 return PTR_ERR(bd);
  89         drm->backlight = bd;
  90         bd->props.brightness = nv40_get_intensity(bd);
  91         backlight_update_status(bd);
  92
  93         return 0;
  94 }
  95
  96 static int
  97 nv50_get_intensity(struct backlight_device *bd)
  98 {
  99         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 100         struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 101         struct nouveau_device *device = nv_device(drm->device);
 102         int or = nv_encoder->or;
 103         u32 div = 1025;
 104         u32 val;
 105
 106         val  = nv_rd32(device, 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 nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 116         struct nouveau_device *device = nv_device(drm->device);
 117         int or = nv_encoder->or;
 118         u32 div = 1025;
 119         u32 val = (bd->props.brightness * div) / 100;
 120
 121         nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
 122                         NV50_PDISP_SOR_PWM_CTL_NEW | val);
 123         return 0;
 124 }
 125
 126 static const struct backlight_ops nv50_bl_ops = {
 127         .options = BL_CORE_SUSPENDRESUME,
 128         .get_brightness = nv50_get_intensity,
 129         .update_status = nv50_set_intensity,
 130 };
 131
 132 static int
 133 nva3_get_intensity(struct backlight_device *bd)
 134 {
 135         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 136         struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 137         struct nouveau_device *device = nv_device(drm->device);
 138         int or = nv_encoder->or;
 139         u32 div, val;
 140
 141         div  = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 142         val  = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
 143         val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
 144         if (div && div >= val)
 145                 return ((val * 100) + (div / 2)) / div;
 146
 147         return 100;
 148 }
 149
 150 static int
 151 nva3_set_intensity(struct backlight_device *bd)
 152 {
 153         struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 154         struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 155         struct nouveau_device *device = nv_device(drm->device);
 156         int or = nv_encoder->or;
 157         u32 div, val;
 158
 159         div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 160         val = (bd->props.brightness * div) / 100;
 161         if (div) {
 162                 nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
 163                                 NV50_PDISP_SOR_PWM_CTL_NEW |
 164                                 NVA3_PDISP_SOR_PWM_CTL_UNK);
 165                 return 0;
 166         }
 167
 168         return -EINVAL;
 169 }
 170
 171 static const struct backlight_ops nva3_bl_ops = {
 172         .options = BL_CORE_SUSPENDRESUME,
 173         .get_brightness = nva3_get_intensity,
 174         .update_status = nva3_set_intensity,
 175 };
 176
 177 static int
 178 nv50_backlight_init(struct drm_connector *connector)
 179 {
 180         struct nouveau_drm *drm = nouveau_drm(connector->dev);
 181         struct nouveau_device *device = nv_device(drm->device);
 182         struct nouveau_encoder *nv_encoder;
 183         struct backlight_properties props;
 184         struct backlight_device *bd;
 185         const struct backlight_ops *ops;
 186
 187         nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
 188         if (!nv_encoder) {
 189                 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
 190                 if (!nv_encoder)
 191                         return -ENODEV;
 192         }
 193
 194         if (!nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
 195                 return 0;
 196
 197         if (device->chipset <= 0xa0 ||
 198             device->chipset == 0xaa ||
 199             device->chipset == 0xac)
 200                 ops = &nv50_bl_ops;
 201         else
 202                 ops = &nva3_bl_ops;
 203
 204         memset(&props, 0, sizeof(struct backlight_properties));
 205         props.type = BACKLIGHT_RAW;
 206         props.max_brightness = 100;
 207         bd = backlight_device_register("nv_backlight", &connector->kdev,
 208                                        nv_encoder, ops, &props);
 209         if (IS_ERR(bd))
 210                 return PTR_ERR(bd);
 211
 212         drm->backlight = bd;
 213         bd->props.brightness = bd->ops->get_brightness(bd);
 214         backlight_update_status(bd);
 215         return 0;
 216 }
 217
 218 int
 219 nouveau_backlight_init(struct drm_device *dev)
 220 {
 221         struct nouveau_drm *drm = nouveau_drm(dev);
 222         struct nouveau_device *device = nv_device(drm->device);
 223         struct drm_connector *connector;
 224
 225 #ifdef CONFIG_ACPI
 226         if (acpi_video_backlight_support()) {
 227                 NV_INFO(drm, "ACPI backlight interface available, "
 228                              "not registering our own\n");
 229                 return 0;
 230         }
 231 #endif
 232
 233         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 234                 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
 235                     connector->connector_type != DRM_MODE_CONNECTOR_eDP)
 236                         continue;
 237
 238                 switch (device->card_type) {
 239                 case NV_40:
 240                         return nv40_backlight_init(connector);
 241                 case NV_50:
 242                 case NV_C0:
 243                 case NV_D0:
 244                 case NV_E0:
 245                         return nv50_backlight_init(connector);
 246                 default:
 247                         break;
 248                 }
 249         }
 250
 251
 252         return 0;
 253 }
 254
 255 void
 256 nouveau_backlight_exit(struct drm_device *dev)
 257 {
 258         struct nouveau_drm *drm = nouveau_drm(dev);
 259
 260         if (drm->backlight) {
 261                 backlight_device_unregister(drm->backlight);
 262                 drm->backlight = NULL;
 263         }
 264 }