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 #include <linux/acpi.h>
35
36 #include "nouveau_drm.h"
37 #include "nouveau_reg.h"
38 #include "nouveau_encoder.h"
39
40 static int
nv40_get_intensity(struct backlight_device * bd)41 nv40_get_intensity(struct backlight_device *bd)
42 {
43 struct nouveau_drm *drm = bl_get_data(bd);
44 struct nouveau_device *device = nv_device(drm->device);
45 int val = (nv_rd32(device, NV40_PMC_BACKLIGHT) &
46 NV40_PMC_BACKLIGHT_MASK) >> 16;
47
48 return val;
49 }
50
51 static int
nv40_set_intensity(struct backlight_device * bd)52 nv40_set_intensity(struct backlight_device *bd)
53 {
54 struct nouveau_drm *drm = bl_get_data(bd);
55 struct nouveau_device *device = nv_device(drm->device);
56 int val = bd->props.brightness;
57 int reg = nv_rd32(device, NV40_PMC_BACKLIGHT);
58
59 nv_wr32(device, NV40_PMC_BACKLIGHT,
60 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
61
62 return 0;
63 }
64
65 static const struct backlight_ops nv40_bl_ops = {
66 .options = BL_CORE_SUSPENDRESUME,
67 .get_brightness = nv40_get_intensity,
68 .update_status = nv40_set_intensity,
69 };
70
71 static int
nv40_backlight_init(struct drm_connector * connector)72 nv40_backlight_init(struct drm_connector *connector)
73 {
74 struct nouveau_drm *drm = nouveau_drm(connector->dev);
75 struct nouveau_device *device = nv_device(drm->device);
76 struct backlight_properties props;
77 struct backlight_device *bd;
78
79 if (!(nv_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
80 return 0;
81
82 memset(&props, 0, sizeof(struct backlight_properties));
83 props.type = BACKLIGHT_RAW;
84 props.max_brightness = 31;
85 bd = backlight_device_register("nv_backlight", connector->kdev, drm,
86 &nv40_bl_ops, &props);
87 if (IS_ERR(bd))
88 return PTR_ERR(bd);
89 drm->backlight = bd;
90 bd->props.brightness = nv40_get_intensity(bd);
91 backlight_update_status(bd);
92
93 return 0;
94 }
95
96 static int
nv50_get_intensity(struct backlight_device * bd)97 nv50_get_intensity(struct backlight_device *bd)
98 {
99 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
100 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
101 struct nouveau_device *device = nv_device(drm->device);
102 int or = nv_encoder->or;
103 u32 div = 1025;
104 u32 val;
105
106 val = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
107 val &= NV50_PDISP_SOR_PWM_CTL_VAL;
108 return ((val * 100) + (div / 2)) / div;
109 }
110
111 static int
nv50_set_intensity(struct backlight_device * bd)112 nv50_set_intensity(struct backlight_device *bd)
113 {
114 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
115 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
116 struct nouveau_device *device = nv_device(drm->device);
117 int or = nv_encoder->or;
118 u32 div = 1025;
119 u32 val = (bd->props.brightness * div) / 100;
120
121 nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
122 NV50_PDISP_SOR_PWM_CTL_NEW | val);
123 return 0;
124 }
125
126 static const struct backlight_ops nv50_bl_ops = {
127 .options = BL_CORE_SUSPENDRESUME,
128 .get_brightness = nv50_get_intensity,
129 .update_status = nv50_set_intensity,
130 };
131
132 static int
nva3_get_intensity(struct backlight_device * bd)133 nva3_get_intensity(struct backlight_device *bd)
134 {
135 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
136 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
137 struct nouveau_device *device = nv_device(drm->device);
138 int or = nv_encoder->or;
139 u32 div, val;
140
141 div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
142 val = nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
143 val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
144 if (div && div >= val)
145 return ((val * 100) + (div / 2)) / div;
146
147 return 100;
148 }
149
150 static int
nva3_set_intensity(struct backlight_device * bd)151 nva3_set_intensity(struct backlight_device *bd)
152 {
153 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
154 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
155 struct nouveau_device *device = nv_device(drm->device);
156 int or = nv_encoder->or;
157 u32 div, val;
158
159 div = nv_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
160 val = (bd->props.brightness * div) / 100;
161 if (div) {
162 nv_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
163 NV50_PDISP_SOR_PWM_CTL_NEW |
164 NVA3_PDISP_SOR_PWM_CTL_UNK);
165 return 0;
166 }
167
168 return -EINVAL;
169 }
170
171 static const struct backlight_ops nva3_bl_ops = {
172 .options = BL_CORE_SUSPENDRESUME,
173 .get_brightness = nva3_get_intensity,
174 .update_status = nva3_set_intensity,
175 };
176
177 static int
nv50_backlight_init(struct drm_connector * connector)178 nv50_backlight_init(struct drm_connector *connector)
179 {
180 struct nouveau_drm *drm = nouveau_drm(connector->dev);
181 struct nouveau_device *device = nv_device(drm->device);
182 struct nouveau_encoder *nv_encoder;
183 struct backlight_properties props;
184 struct backlight_device *bd;
185 const struct backlight_ops *ops;
186
187 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
188 if (!nv_encoder) {
189 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
190 if (!nv_encoder)
191 return -ENODEV;
192 }
193
194 if (!nv_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
195 return 0;
196
197 if (device->chipset <= 0xa0 ||
198 device->chipset == 0xaa ||
199 device->chipset == 0xac)
200 ops = &nv50_bl_ops;
201 else
202 ops = &nva3_bl_ops;
203
204 memset(&props, 0, sizeof(struct backlight_properties));
205 props.type = BACKLIGHT_RAW;
206 props.max_brightness = 100;
207 bd = backlight_device_register("nv_backlight", connector->kdev,
208 nv_encoder, ops, &props);
209 if (IS_ERR(bd))
210 return PTR_ERR(bd);
211
212 drm->backlight = bd;
213 bd->props.brightness = bd->ops->get_brightness(bd);
214 backlight_update_status(bd);
215 return 0;
216 }
217
218 int
nouveau_backlight_init(struct drm_device * dev)219 nouveau_backlight_init(struct drm_device *dev)
220 {
221 struct nouveau_drm *drm = nouveau_drm(dev);
222 struct nouveau_device *device = nv_device(drm->device);
223 struct drm_connector *connector;
224
225 #ifdef CONFIG_ACPI
226 if (acpi_video_backlight_support()) {
227 NV_INFO(drm, "ACPI backlight interface available, "
228 "not registering our own\n");
229 return 0;
230 }
231 #endif
232
233 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
234 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
235 connector->connector_type != DRM_MODE_CONNECTOR_eDP)
236 continue;
237
238 switch (device->card_type) {
239 case NV_40:
240 return nv40_backlight_init(connector);
241 case NV_50:
242 case NV_C0:
243 case NV_D0:
244 case NV_E0:
245 return nv50_backlight_init(connector);
246 default:
247 break;
248 }
249 }
250
251
252 return 0;
253 }
254
255 void
nouveau_backlight_exit(struct drm_device * dev)256 nouveau_backlight_exit(struct drm_device *dev)
257 {
258 struct nouveau_drm *drm = nouveau_drm(dev);
259
260 if (drm->backlight) {
261 backlight_device_unregister(drm->backlight);
262 drm->backlight = NULL;
263 }
264 }
265