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