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 35 #include "nouveau_drm.h" 36 #include "nouveau_reg.h" 37 #include "nouveau_encoder.h" 38 39 static int 40 nv40_get_intensity(struct backlight_device *bd) 41 { 42 struct nouveau_drm *drm = bl_get_data(bd); 43 struct nvif_device *device = &drm->device; 44 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) & 45 NV40_PMC_BACKLIGHT_MASK) >> 16; 46 47 return val; 48 } 49 50 static int 51 nv40_set_intensity(struct backlight_device *bd) 52 { 53 struct nouveau_drm *drm = bl_get_data(bd); 54 struct nvif_device *device = &drm->device; 55 int val = bd->props.brightness; 56 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT); 57 58 nvif_wr32(device, NV40_PMC_BACKLIGHT, 59 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK)); 60 61 return 0; 62 } 63 64 static const struct backlight_ops nv40_bl_ops = { 65 .options = BL_CORE_SUSPENDRESUME, 66 .get_brightness = nv40_get_intensity, 67 .update_status = nv40_set_intensity, 68 }; 69 70 static int 71 nv40_backlight_init(struct drm_connector *connector) 72 { 73 struct nouveau_drm *drm = nouveau_drm(connector->dev); 74 struct nvif_device *device = &drm->device; 75 struct backlight_properties props; 76 struct backlight_device *bd; 77 78 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)) 79 return 0; 80 81 memset(&props, 0, sizeof(struct backlight_properties)); 82 props.type = BACKLIGHT_RAW; 83 props.max_brightness = 31; 84 bd = backlight_device_register("nv_backlight", connector->kdev, drm, 85 &nv40_bl_ops, &props); 86 if (IS_ERR(bd)) 87 return PTR_ERR(bd); 88 drm->backlight = bd; 89 bd->props.brightness = nv40_get_intensity(bd); 90 backlight_update_status(bd); 91 92 return 0; 93 } 94 95 static int 96 nv50_get_intensity(struct backlight_device *bd) 97 { 98 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 99 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 100 struct nvif_device *device = &drm->device; 101 int or = nv_encoder->or; 102 u32 div = 1025; 103 u32 val; 104 105 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 106 val &= NV50_PDISP_SOR_PWM_CTL_VAL; 107 return ((val * 100) + (div / 2)) / div; 108 } 109 110 static int 111 nv50_set_intensity(struct backlight_device *bd) 112 { 113 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 114 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 115 struct nvif_device *device = &drm->device; 116 int or = nv_encoder->or; 117 u32 div = 1025; 118 u32 val = (bd->props.brightness * div) / 100; 119 120 nvif_wr32(device, 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 nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 136 struct nvif_device *device = &drm->device; 137 int or = nv_encoder->or; 138 u32 div, val; 139 140 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 141 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 142 val &= NVA3_PDISP_SOR_PWM_CTL_VAL; 143 if (div && div >= val) 144 return ((val * 100) + (div / 2)) / div; 145 146 return 100; 147 } 148 149 static int 150 nva3_set_intensity(struct backlight_device *bd) 151 { 152 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 153 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 154 struct nvif_device *device = &drm->device; 155 int or = nv_encoder->or; 156 u32 div, val; 157 158 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 159 val = (bd->props.brightness * div) / 100; 160 if (div) { 161 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val | 162 NV50_PDISP_SOR_PWM_CTL_NEW | 163 NVA3_PDISP_SOR_PWM_CTL_UNK); 164 return 0; 165 } 166 167 return -EINVAL; 168 } 169 170 static const struct backlight_ops nva3_bl_ops = { 171 .options = BL_CORE_SUSPENDRESUME, 172 .get_brightness = nva3_get_intensity, 173 .update_status = nva3_set_intensity, 174 }; 175 176 static int 177 nv50_backlight_init(struct drm_connector *connector) 178 { 179 struct nouveau_drm *drm = nouveau_drm(connector->dev); 180 struct nvif_device *device = &drm->device; 181 struct nouveau_encoder *nv_encoder; 182 struct backlight_properties props; 183 struct backlight_device *bd; 184 const struct backlight_ops *ops; 185 186 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS); 187 if (!nv_encoder) { 188 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP); 189 if (!nv_encoder) 190 return -ENODEV; 191 } 192 193 if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or))) 194 return 0; 195 196 if (device->info.chipset <= 0xa0 || 197 device->info.chipset == 0xaa || 198 device->info.chipset == 0xac) 199 ops = &nv50_bl_ops; 200 else 201 ops = &nva3_bl_ops; 202 203 memset(&props, 0, sizeof(struct backlight_properties)); 204 props.type = BACKLIGHT_RAW; 205 props.max_brightness = 100; 206 bd = backlight_device_register("nv_backlight", connector->kdev, 207 nv_encoder, ops, &props); 208 if (IS_ERR(bd)) 209 return PTR_ERR(bd); 210 211 drm->backlight = bd; 212 bd->props.brightness = bd->ops->get_brightness(bd); 213 backlight_update_status(bd); 214 return 0; 215 } 216 217 int 218 nouveau_backlight_init(struct drm_device *dev) 219 { 220 struct nouveau_drm *drm = nouveau_drm(dev); 221 struct nvif_device *device = &drm->device; 222 struct drm_connector *connector; 223 224 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 225 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS && 226 connector->connector_type != DRM_MODE_CONNECTOR_eDP) 227 continue; 228 229 switch (device->info.family) { 230 case NV_DEVICE_INFO_V0_CURIE: 231 return nv40_backlight_init(connector); 232 case NV_DEVICE_INFO_V0_TESLA: 233 case NV_DEVICE_INFO_V0_FERMI: 234 case NV_DEVICE_INFO_V0_KEPLER: 235 return nv50_backlight_init(connector); 236 default: 237 break; 238 } 239 } 240 241 242 return 0; 243 } 244 245 void 246 nouveau_backlight_exit(struct drm_device *dev) 247 { 248 struct nouveau_drm *drm = nouveau_drm(dev); 249 250 if (drm->backlight) { 251 backlight_device_unregister(drm->backlight); 252 drm->backlight = NULL; 253 } 254 } 255