LXR linux/drivers/gpu/drm/nouveau/nouveau

   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/apple-gmux.h>
  34#include <linux/backlight.h>
  35#include <linux/idr.h>
  36
  37#include "nouveau_drv.h"
  38#include "nouveau_reg.h"
  39#include "nouveau_encoder.h"
  40#include "nouveau_connector.h"
  41
  42static struct ida bl_ida;
  43#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
  44
  45struct nouveau_backlight {
  46        struct backlight_device *dev;
  47        int id;
  48};
  49
  50static bool
  51nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
  52                           struct nouveau_backlight *bl)
  53{
  54        const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
  55        if (nb < 0 || nb >= 100)
  56                return false;
  57        if (nb > 0)
  58                snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
  59        else
  60                snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
  61        bl->id = nb;
  62        return true;
  63}
  64
  65static int
  66nv40_get_intensity(struct backlight_device *bd)
  67{
  68        struct nouveau_encoder *nv_encoder = bl_get_data(bd);
  69        struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
  70        struct nvif_object *device = &drm->client.device.object;
  71        int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
  72                   NV40_PMC_BACKLIGHT_MASK) >> 16;
  73
  74        return val;
  75}
  76
  77static int
  78nv40_set_intensity(struct backlight_device *bd)
  79{
  80        struct nouveau_encoder *nv_encoder = bl_get_data(bd);
  81        struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
  82        struct nvif_object *device = &drm->client.device.object;
  83        int val = bd->props.brightness;
  84        int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
  85
  86        nvif_wr32(device, NV40_PMC_BACKLIGHT,
  87                  (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
  88
  89        return 0;
  90}
  91
  92static const struct backlight_ops nv40_bl_ops = {
  93        .options = BL_CORE_SUSPENDRESUME,
  94        .get_brightness = nv40_get_intensity,
  95        .update_status = nv40_set_intensity,
  96};
  97
  98static int
  99nv40_backlight_init(struct nouveau_encoder *encoder,
 100                    struct backlight_properties *props,
 101                    const struct backlight_ops **ops)
 102{
 103        struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev);
 104        struct nvif_object *device = &drm->client.device.object;
 105
 106        if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
 107                return -ENODEV;
 108
 109        props->type = BACKLIGHT_RAW;
 110        props->max_brightness = 31;
 111        *ops = &nv40_bl_ops;
 112        return 0;
 113}
 114
 115static int
 116nv50_get_intensity(struct backlight_device *bd)
 117{
 118        struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 119        struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 120        struct nvif_object *device = &drm->client.device.object;
 121        int or = ffs(nv_encoder->dcb->or) - 1;
 122        u32 div = 1025;
 123        u32 val;
 124
 125        val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
 126        val &= NV50_PDISP_SOR_PWM_CTL_VAL;
 127        return ((val * 100) + (div / 2)) / div;
 128}
 129
 130static int
 131nv50_set_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 nvif_object *device = &drm->client.device.object;
 136        int or = ffs(nv_encoder->dcb->or) - 1;
 137        u32 div = 1025;
 138        u32 val = (bd->props.brightness * div) / 100;
 139
 140        nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
 141                  NV50_PDISP_SOR_PWM_CTL_NEW | val);
 142        return 0;
 143}
 144
 145static const struct backlight_ops nv50_bl_ops = {
 146        .options = BL_CORE_SUSPENDRESUME,
 147        .get_brightness = nv50_get_intensity,
 148        .update_status = nv50_set_intensity,
 149};
 150
 151static int
 152nva3_get_intensity(struct backlight_device *bd)
 153{
 154        struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 155        struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 156        struct nvif_object *device = &drm->client.device.object;
 157        int or = ffs(nv_encoder->dcb->or) - 1;
 158        u32 div, val;
 159
 160        div  = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 161        val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
 162        val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
 163        if (div && div >= val)
 164                return ((val * 100) + (div / 2)) / div;
 165
 166        return 100;
 167}
 168
 169static int
 170nva3_set_intensity(struct backlight_device *bd)
 171{
 172        struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 173        struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 174        struct nvif_object *device = &drm->client.device.object;
 175        int or = ffs(nv_encoder->dcb->or) - 1;
 176        u32 div, val;
 177
 178        div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
 179        val = (bd->props.brightness * div) / 100;
 180        if (div) {
 181                nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
 182                          val |
 183                          NV50_PDISP_SOR_PWM_CTL_NEW |
 184                          NVA3_PDISP_SOR_PWM_CTL_UNK);
 185                return 0;
 186        }
 187
 188        return -EINVAL;
 189}
 190
 191static const struct backlight_ops nva3_bl_ops = {
 192        .options = BL_CORE_SUSPENDRESUME,
 193        .get_brightness = nva3_get_intensity,
 194        .update_status = nva3_set_intensity,
 195};
 196
 197static int
 198nv50_backlight_init(struct nouveau_encoder *nv_encoder,
 199                    struct backlight_properties *props,
 200                    const struct backlight_ops **ops)
 201{
 202        struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
 203        struct nvif_object *device = &drm->client.device.object;
 204
 205        if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)))
 206                return -ENODEV;
 207
 208        if (drm->client.device.info.chipset <= 0xa0 ||
 209            drm->client.device.info.chipset == 0xaa ||
 210            drm->client.device.info.chipset == 0xac)
 211                *ops = &nv50_bl_ops;
 212        else
 213                *ops = &nva3_bl_ops;
 214
 215        props->type = BACKLIGHT_RAW;
 216        props->max_brightness = 100;
 217
 218        return 0;
 219}
 220
 221int
 222nouveau_backlight_init(struct drm_connector *connector)
 223{
 224        struct nouveau_drm *drm = nouveau_drm(connector->dev);
 225        struct nouveau_backlight *bl;
 226        struct nouveau_encoder *nv_encoder = NULL;
 227        struct nvif_device *device = &drm->client.device;
 228        char backlight_name[BL_NAME_SIZE];
 229        struct backlight_properties props = {0};
 230        const struct backlight_ops *ops;
 231        int ret;
 232
 233        if (apple_gmux_present()) {
 234                NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
 235                return 0;
 236        }
 237
 238        if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
 239                nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
 240        else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
 241                nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
 242        else
 243                return 0;
 244
 245        if (!nv_encoder)
 246                return 0;
 247
 248        switch (device->info.family) {
 249        case NV_DEVICE_INFO_V0_CURIE:
 250                ret = nv40_backlight_init(nv_encoder, &props, &ops);
 251                break;
 252        case NV_DEVICE_INFO_V0_TESLA:
 253        case NV_DEVICE_INFO_V0_FERMI:
 254        case NV_DEVICE_INFO_V0_KEPLER:
 255        case NV_DEVICE_INFO_V0_MAXWELL:
 256        case NV_DEVICE_INFO_V0_PASCAL:
 257        case NV_DEVICE_INFO_V0_VOLTA:
 258        case NV_DEVICE_INFO_V0_TURING:
 259                ret = nv50_backlight_init(nv_encoder, &props, &ops);
 260                break;
 261        default:
 262                return 0;
 263        }
 264
 265        if (ret == -ENODEV)
 266                return 0;
 267        else if (ret)
 268                return ret;
 269
 270        bl = kzalloc(sizeof(*bl), GFP_KERNEL);
 271        if (!bl)
 272                return -ENOMEM;
 273
 274        if (!nouveau_get_backlight_name(backlight_name, bl)) {
 275                NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
 276                goto fail_alloc;
 277        }
 278
 279        bl->dev = backlight_device_register(backlight_name, connector->kdev,
 280                                            nv_encoder, ops, &props);
 281        if (IS_ERR(bl->dev)) {
 282                if (bl->id >= 0)
 283                        ida_simple_remove(&bl_ida, bl->id);
 284                ret = PTR_ERR(bl->dev);
 285                goto fail_alloc;
 286        }
 287
 288        nouveau_connector(connector)->backlight = bl;
 289        bl->dev->props.brightness = bl->dev->ops->get_brightness(bl->dev);
 290        backlight_update_status(bl->dev);
 291
 292        return 0;
 293
 294fail_alloc:
 295        kfree(bl);
 296        return ret;
 297}
 298
 299void
 300nouveau_backlight_fini(struct drm_connector *connector)
 301{
 302        struct nouveau_connector *nv_conn = nouveau_connector(connector);
 303        struct nouveau_backlight *bl = nv_conn->backlight;
 304
 305        if (!bl)
 306                return;
 307
 308        if (bl->id >= 0)
 309                ida_simple_remove(&bl_ida, bl->id);
 310
 311        backlight_device_unregister(bl->dev);
 312        nv_conn->backlight = NULL;
 313        kfree(bl);
 314}
 315
 316void
 317nouveau_backlight_ctor(void)
 318{
 319        ida_init(&bl_ida);
 320}
 321
 322void
 323nouveau_backlight_dtor(void)
 324{
 325        ida_destroy(&bl_ida);
 326}
 327