1 /* $NetBSD: nouveau_backlight.c,v 1.3 2021/12/18 23:45:32 riastradh Exp $ */ 2 3 /* 4 * Copyright (C) 2009 Red Hat <mjg@redhat.com> 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining 7 * a copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sublicense, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial 16 * portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 21 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 */ 27 28 /* 29 * Authors: 30 * Matthew Garrett <mjg@redhat.com> 31 * 32 * Register locations derived from NVClock by Roderick Colenbrander 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: nouveau_backlight.c,v 1.3 2021/12/18 23:45:32 riastradh Exp $"); 37 38 #include <linux/apple-gmux.h> 39 #include <linux/backlight.h> 40 #include <linux/idr.h> 41 42 #include "nouveau_drv.h" 43 #include "nouveau_reg.h" 44 #include "nouveau_encoder.h" 45 #include "nouveau_connector.h" 46 47 static struct ida bl_ida; 48 #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0' 49 50 struct nouveau_backlight { 51 struct backlight_device *dev; 52 int id; 53 }; 54 55 static bool 56 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], 57 struct nouveau_backlight *bl) 58 { 59 const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL); 60 if (nb < 0 || nb >= 100) 61 return false; 62 if (nb > 0) 63 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb); 64 else 65 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight"); 66 bl->id = nb; 67 return true; 68 } 69 70 static int 71 nv40_get_intensity(struct backlight_device *bd) 72 { 73 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 74 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 75 struct nvif_object *device = &drm->client.device.object; 76 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) & 77 NV40_PMC_BACKLIGHT_MASK) >> 16; 78 79 return val; 80 } 81 82 static int 83 nv40_set_intensity(struct backlight_device *bd) 84 { 85 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 86 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 87 struct nvif_object *device = &drm->client.device.object; 88 int val = bd->props.brightness; 89 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT); 90 91 nvif_wr32(device, NV40_PMC_BACKLIGHT, 92 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK)); 93 94 return 0; 95 } 96 97 static const struct backlight_ops nv40_bl_ops = { 98 .options = BL_CORE_SUSPENDRESUME, 99 .get_brightness = nv40_get_intensity, 100 .update_status = nv40_set_intensity, 101 }; 102 103 static int 104 nv40_backlight_init(struct nouveau_encoder *encoder, 105 struct backlight_properties *props, 106 const struct backlight_ops **ops) 107 { 108 struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev); 109 struct nvif_object *device = &drm->client.device.object; 110 111 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)) 112 return -ENODEV; 113 114 props->type = BACKLIGHT_RAW; 115 props->max_brightness = 31; 116 *ops = &nv40_bl_ops; 117 return 0; 118 } 119 120 static int 121 nv50_get_intensity(struct backlight_device *bd) 122 { 123 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 124 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 125 struct nvif_object *device = &drm->client.device.object; 126 int or = ffs(nv_encoder->dcb->or) - 1; 127 u32 div = 1025; 128 u32 val; 129 130 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 131 val &= NV50_PDISP_SOR_PWM_CTL_VAL; 132 return ((val * 100) + (div / 2)) / div; 133 } 134 135 static int 136 nv50_set_intensity(struct backlight_device *bd) 137 { 138 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 139 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 140 struct nvif_object *device = &drm->client.device.object; 141 int or = ffs(nv_encoder->dcb->or) - 1; 142 u32 div = 1025; 143 u32 val = (bd->props.brightness * div) / 100; 144 145 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), 146 NV50_PDISP_SOR_PWM_CTL_NEW | val); 147 return 0; 148 } 149 150 static const struct backlight_ops nv50_bl_ops = { 151 .options = BL_CORE_SUSPENDRESUME, 152 .get_brightness = nv50_get_intensity, 153 .update_status = nv50_set_intensity, 154 }; 155 156 static int 157 nva3_get_intensity(struct backlight_device *bd) 158 { 159 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 160 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 161 struct nvif_object *device = &drm->client.device.object; 162 int or = ffs(nv_encoder->dcb->or) - 1; 163 u32 div, val; 164 165 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 166 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 167 val &= NVA3_PDISP_SOR_PWM_CTL_VAL; 168 if (div && div >= val) 169 return ((val * 100) + (div / 2)) / div; 170 171 return 100; 172 } 173 174 static int 175 nva3_set_intensity(struct backlight_device *bd) 176 { 177 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 178 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 179 struct nvif_object *device = &drm->client.device.object; 180 int or = ffs(nv_encoder->dcb->or) - 1; 181 u32 div, val; 182 183 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 184 val = (bd->props.brightness * div) / 100; 185 if (div) { 186 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), 187 val | 188 NV50_PDISP_SOR_PWM_CTL_NEW | 189 NVA3_PDISP_SOR_PWM_CTL_UNK); 190 return 0; 191 } 192 193 return -EINVAL; 194 } 195 196 static const struct backlight_ops nva3_bl_ops = { 197 .options = BL_CORE_SUSPENDRESUME, 198 .get_brightness = nva3_get_intensity, 199 .update_status = nva3_set_intensity, 200 }; 201 202 static int 203 nv50_backlight_init(struct nouveau_encoder *nv_encoder, 204 struct backlight_properties *props, 205 const struct backlight_ops **ops) 206 { 207 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 208 struct nvif_object *device = &drm->client.device.object; 209 210 if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1))) 211 return -ENODEV; 212 213 if (drm->client.device.info.chipset <= 0xa0 || 214 drm->client.device.info.chipset == 0xaa || 215 drm->client.device.info.chipset == 0xac) 216 *ops = &nv50_bl_ops; 217 else 218 *ops = &nva3_bl_ops; 219 220 props->type = BACKLIGHT_RAW; 221 props->max_brightness = 100; 222 223 return 0; 224 } 225 226 int 227 nouveau_backlight_init(struct drm_connector *connector) 228 { 229 struct nouveau_drm *drm = nouveau_drm(connector->dev); 230 struct nouveau_backlight *bl; 231 struct nouveau_encoder *nv_encoder = NULL; 232 struct nvif_device *device = &drm->client.device; 233 char backlight_name[BL_NAME_SIZE]; 234 struct backlight_properties props = {0}; 235 const struct backlight_ops *ops; 236 int ret; 237 238 if (apple_gmux_present()) { 239 NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n"); 240 return 0; 241 } 242 243 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS) 244 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS); 245 else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) 246 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP); 247 else 248 return 0; 249 250 if (!nv_encoder) 251 return 0; 252 253 switch (device->info.family) { 254 case NV_DEVICE_INFO_V0_CURIE: 255 ret = nv40_backlight_init(nv_encoder, &props, &ops); 256 break; 257 case NV_DEVICE_INFO_V0_TESLA: 258 case NV_DEVICE_INFO_V0_FERMI: 259 case NV_DEVICE_INFO_V0_KEPLER: 260 case NV_DEVICE_INFO_V0_MAXWELL: 261 case NV_DEVICE_INFO_V0_PASCAL: 262 case NV_DEVICE_INFO_V0_VOLTA: 263 case NV_DEVICE_INFO_V0_TURING: 264 ret = nv50_backlight_init(nv_encoder, &props, &ops); 265 break; 266 default: 267 return 0; 268 } 269 270 if (ret == -ENODEV) 271 return 0; 272 else if (ret) 273 return ret; 274 275 bl = kzalloc(sizeof(*bl), GFP_KERNEL); 276 if (!bl) 277 return -ENOMEM; 278 279 if (!nouveau_get_backlight_name(backlight_name, bl)) { 280 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n"); 281 goto fail_alloc; 282 } 283 284 bl->dev = backlight_device_register(backlight_name, connector->kdev, 285 nv_encoder, ops, &props); 286 if (IS_ERR(bl->dev)) { 287 if (bl->id >= 0) 288 ida_simple_remove(&bl_ida, bl->id); 289 ret = PTR_ERR(bl->dev); 290 goto fail_alloc; 291 } 292 293 nouveau_connector(connector)->backlight = bl; 294 bl->dev->props.brightness = bl->dev->ops->get_brightness(bl->dev); 295 backlight_update_status(bl->dev); 296 297 return 0; 298 299 fail_alloc: 300 kfree(bl); 301 return ret; 302 } 303 304 void 305 nouveau_backlight_fini(struct drm_connector *connector) 306 { 307 struct nouveau_connector *nv_conn = nouveau_connector(connector); 308 struct nouveau_backlight *bl = nv_conn->backlight; 309 310 if (!bl) 311 return; 312 313 if (bl->id >= 0) 314 ida_simple_remove(&bl_ida, bl->id); 315 316 backlight_device_unregister(bl->dev); 317 nv_conn->backlight = NULL; 318 kfree(bl); 319 } 320 321 void 322 nouveau_backlight_ctor(void) 323 { 324 ida_init(&bl_ida); 325 } 326 327 void 328 nouveau_backlight_dtor(void) 329 { 330 ida_destroy(&bl_ida); 331 } 332