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 41 static struct ida bl_ida; 42 #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0' 43 44 struct backlight_connector { 45 struct list_head head; 46 int id; 47 }; 48 49 static bool 50 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], struct backlight_connector 51 *connector) 52 { 53 const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL); 54 if (nb < 0 || nb >= 100) 55 return false; 56 if (nb > 0) 57 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb); 58 else 59 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight"); 60 connector->id = nb; 61 return true; 62 } 63 64 static int 65 nv40_get_intensity(struct backlight_device *bd) 66 { 67 struct nouveau_drm *drm = bl_get_data(bd); 68 struct nvif_object *device = &drm->client.device.object; 69 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) & 70 NV40_PMC_BACKLIGHT_MASK) >> 16; 71 72 return val; 73 } 74 75 static int 76 nv40_set_intensity(struct backlight_device *bd) 77 { 78 struct nouveau_drm *drm = bl_get_data(bd); 79 struct nvif_object *device = &drm->client.device.object; 80 int val = bd->props.brightness; 81 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT); 82 83 nvif_wr32(device, NV40_PMC_BACKLIGHT, 84 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK)); 85 86 return 0; 87 } 88 89 static const struct backlight_ops nv40_bl_ops = { 90 .options = BL_CORE_SUSPENDRESUME, 91 .get_brightness = nv40_get_intensity, 92 .update_status = nv40_set_intensity, 93 }; 94 95 static int 96 nv40_backlight_init(struct drm_connector *connector) 97 { 98 struct nouveau_drm *drm = nouveau_drm(connector->dev); 99 struct nvif_object *device = &drm->client.device.object; 100 struct backlight_properties props; 101 struct backlight_device *bd; 102 struct backlight_connector bl_connector; 103 char backlight_name[BL_NAME_SIZE]; 104 105 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)) 106 return 0; 107 108 memset(&props, 0, sizeof(struct backlight_properties)); 109 props.type = BACKLIGHT_RAW; 110 props.max_brightness = 31; 111 if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) { 112 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n"); 113 return 0; 114 } 115 bd = backlight_device_register(backlight_name , connector->kdev, drm, 116 &nv40_bl_ops, &props); 117 118 if (IS_ERR(bd)) { 119 if (bl_connector.id > 0) 120 ida_simple_remove(&bl_ida, bl_connector.id); 121 return PTR_ERR(bd); 122 } 123 list_add(&bl_connector.head, &drm->bl_connectors); 124 drm->backlight = bd; 125 bd->props.brightness = nv40_get_intensity(bd); 126 backlight_update_status(bd); 127 128 return 0; 129 } 130 131 static int 132 nv50_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_object *device = &drm->client.device.object; 137 int or = ffs(nv_encoder->dcb->or) - 1; 138 u32 div = 1025; 139 u32 val; 140 141 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 142 val &= NV50_PDISP_SOR_PWM_CTL_VAL; 143 return ((val * 100) + (div / 2)) / div; 144 } 145 146 static int 147 nv50_set_intensity(struct backlight_device *bd) 148 { 149 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 150 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 151 struct nvif_object *device = &drm->client.device.object; 152 int or = ffs(nv_encoder->dcb->or) - 1; 153 u32 div = 1025; 154 u32 val = (bd->props.brightness * div) / 100; 155 156 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), 157 NV50_PDISP_SOR_PWM_CTL_NEW | val); 158 return 0; 159 } 160 161 static const struct backlight_ops nv50_bl_ops = { 162 .options = BL_CORE_SUSPENDRESUME, 163 .get_brightness = nv50_get_intensity, 164 .update_status = nv50_set_intensity, 165 }; 166 167 static int 168 nva3_get_intensity(struct backlight_device *bd) 169 { 170 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 171 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 172 struct nvif_object *device = &drm->client.device.object; 173 int or = ffs(nv_encoder->dcb->or) - 1; 174 u32 div, val; 175 176 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 177 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 178 val &= NVA3_PDISP_SOR_PWM_CTL_VAL; 179 if (div && div >= val) 180 return ((val * 100) + (div / 2)) / div; 181 182 return 100; 183 } 184 185 static int 186 nva3_set_intensity(struct backlight_device *bd) 187 { 188 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 189 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 190 struct nvif_object *device = &drm->client.device.object; 191 int or = ffs(nv_encoder->dcb->or) - 1; 192 u32 div, val; 193 194 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 195 val = (bd->props.brightness * div) / 100; 196 if (div) { 197 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val | 198 NV50_PDISP_SOR_PWM_CTL_NEW | 199 NVA3_PDISP_SOR_PWM_CTL_UNK); 200 return 0; 201 } 202 203 return -EINVAL; 204 } 205 206 static const struct backlight_ops nva3_bl_ops = { 207 .options = BL_CORE_SUSPENDRESUME, 208 .get_brightness = nva3_get_intensity, 209 .update_status = nva3_set_intensity, 210 }; 211 212 static int 213 nv50_backlight_init(struct drm_connector *connector) 214 { 215 struct nouveau_drm *drm = nouveau_drm(connector->dev); 216 struct nvif_object *device = &drm->client.device.object; 217 struct nouveau_encoder *nv_encoder; 218 struct backlight_properties props; 219 struct backlight_device *bd; 220 const struct backlight_ops *ops; 221 struct backlight_connector bl_connector; 222 char backlight_name[BL_NAME_SIZE]; 223 224 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS); 225 if (!nv_encoder) { 226 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP); 227 if (!nv_encoder) 228 return -ENODEV; 229 } 230 231 if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1))) 232 return 0; 233 234 if (drm->client.device.info.chipset <= 0xa0 || 235 drm->client.device.info.chipset == 0xaa || 236 drm->client.device.info.chipset == 0xac) 237 ops = &nv50_bl_ops; 238 else 239 ops = &nva3_bl_ops; 240 241 memset(&props, 0, sizeof(struct backlight_properties)); 242 props.type = BACKLIGHT_RAW; 243 props.max_brightness = 100; 244 if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) { 245 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n"); 246 return 0; 247 } 248 bd = backlight_device_register(backlight_name , connector->kdev, 249 nv_encoder, ops, &props); 250 251 if (IS_ERR(bd)) { 252 if (bl_connector.id > 0) 253 ida_simple_remove(&bl_ida, bl_connector.id); 254 return PTR_ERR(bd); 255 } 256 257 list_add(&bl_connector.head, &drm->bl_connectors); 258 drm->backlight = bd; 259 bd->props.brightness = bd->ops->get_brightness(bd); 260 backlight_update_status(bd); 261 return 0; 262 } 263 264 int 265 nouveau_backlight_init(struct drm_device *dev) 266 { 267 struct nouveau_drm *drm = nouveau_drm(dev); 268 struct nvif_device *device = &drm->client.device; 269 struct drm_connector *connector; 270 271 INIT_LIST_HEAD(&drm->bl_connectors); 272 273 if (apple_gmux_present()) { 274 NV_INFO(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n"); 275 return 0; 276 } 277 278 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 279 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS && 280 connector->connector_type != DRM_MODE_CONNECTOR_eDP) 281 continue; 282 283 switch (device->info.family) { 284 case NV_DEVICE_INFO_V0_CURIE: 285 return nv40_backlight_init(connector); 286 case NV_DEVICE_INFO_V0_TESLA: 287 case NV_DEVICE_INFO_V0_FERMI: 288 case NV_DEVICE_INFO_V0_KEPLER: 289 case NV_DEVICE_INFO_V0_MAXWELL: 290 return nv50_backlight_init(connector); 291 default: 292 break; 293 } 294 } 295 296 297 return 0; 298 } 299 300 void 301 nouveau_backlight_exit(struct drm_device *dev) 302 { 303 struct nouveau_drm *drm = nouveau_drm(dev); 304 struct backlight_connector *connector; 305 306 list_for_each_entry(connector, &drm->bl_connectors, head) { 307 if (connector->id >= 0) 308 ida_simple_remove(&bl_ida, connector->id); 309 } 310 311 if (drm->backlight) { 312 backlight_device_unregister(drm->backlight); 313 drm->backlight = NULL; 314 } 315 } 316 317 void 318 nouveau_backlight_ctor(void) 319 { 320 ida_init(&bl_ida); 321 } 322 323 void 324 nouveau_backlight_dtor(void) 325 { 326 ida_destroy(&bl_ida); 327 } 328