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
nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],struct nouveau_backlight * bl)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
nv40_get_intensity(struct backlight_device * bd)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
nv40_set_intensity(struct backlight_device * bd)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
nv40_backlight_init(struct nouveau_encoder * encoder,struct backlight_properties * props,const struct backlight_ops ** ops)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
nv50_get_intensity(struct backlight_device * bd)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
nv50_set_intensity(struct backlight_device * bd)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
nva3_get_intensity(struct backlight_device * bd)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
nva3_set_intensity(struct backlight_device * bd)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
nv50_backlight_init(struct nouveau_encoder * nv_encoder,struct backlight_properties * props,const struct backlight_ops ** ops)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
nouveau_backlight_init(struct drm_connector * connector)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
nouveau_backlight_fini(struct drm_connector * connector)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
nouveau_backlight_ctor(void)322 nouveau_backlight_ctor(void)
323 {
324 ida_init(&bl_ida);
325 }
326
327 void
nouveau_backlight_dtor(void)328 nouveau_backlight_dtor(void)
329 {
330 ida_destroy(&bl_ida);
331 }
332