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
35#include "nouveau_drm.h"
36#include "nouveau_reg.h"
37#include "nouveau_encoder.h"
38
39static int
40nv40_get_intensity(struct backlight_device *bd)
41{
42	struct nouveau_drm *drm = bl_get_data(bd);
43	struct nvif_device *device = &drm->device;
44	int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
45				   NV40_PMC_BACKLIGHT_MASK) >> 16;
46
47	return val;
48}
49
50static int
51nv40_set_intensity(struct backlight_device *bd)
52{
53	struct nouveau_drm *drm = bl_get_data(bd);
54	struct nvif_device *device = &drm->device;
55	int val = bd->props.brightness;
56	int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
57
58	nvif_wr32(device, NV40_PMC_BACKLIGHT,
59		 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
60
61	return 0;
62}
63
64static const struct backlight_ops nv40_bl_ops = {
65	.options = BL_CORE_SUSPENDRESUME,
66	.get_brightness = nv40_get_intensity,
67	.update_status = nv40_set_intensity,
68};
69
70static int
71nv40_backlight_init(struct drm_connector *connector)
72{
73	struct nouveau_drm *drm = nouveau_drm(connector->dev);
74	struct nvif_device *device = &drm->device;
75	struct backlight_properties props;
76	struct backlight_device *bd;
77
78	if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
79		return 0;
80
81	memset(&props, 0, sizeof(struct backlight_properties));
82	props.type = BACKLIGHT_RAW;
83	props.max_brightness = 31;
84	bd = backlight_device_register("nv_backlight", connector->kdev, drm,
85				       &nv40_bl_ops, &props);
86	if (IS_ERR(bd))
87		return PTR_ERR(bd);
88	drm->backlight = bd;
89	bd->props.brightness = nv40_get_intensity(bd);
90	backlight_update_status(bd);
91
92	return 0;
93}
94
95static int
96nv50_get_intensity(struct backlight_device *bd)
97{
98	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
99	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
100	struct nvif_device *device = &drm->device;
101	int or = nv_encoder->or;
102	u32 div = 1025;
103	u32 val;
104
105	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
106	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
107	return ((val * 100) + (div / 2)) / div;
108}
109
110static int
111nv50_set_intensity(struct backlight_device *bd)
112{
113	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
114	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
115	struct nvif_device *device = &drm->device;
116	int or = nv_encoder->or;
117	u32 div = 1025;
118	u32 val = (bd->props.brightness * div) / 100;
119
120	nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
121			NV50_PDISP_SOR_PWM_CTL_NEW | val);
122	return 0;
123}
124
125static 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
131static int
132nva3_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_device *device = &drm->device;
137	int or = nv_encoder->or;
138	u32 div, val;
139
140	div  = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
141	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
142	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
143	if (div && div >= val)
144		return ((val * 100) + (div / 2)) / div;
145
146	return 100;
147}
148
149static int
150nva3_set_intensity(struct backlight_device *bd)
151{
152	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
153	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
154	struct nvif_device *device = &drm->device;
155	int or = nv_encoder->or;
156	u32 div, val;
157
158	div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
159	val = (bd->props.brightness * div) / 100;
160	if (div) {
161		nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
162				NV50_PDISP_SOR_PWM_CTL_NEW |
163				NVA3_PDISP_SOR_PWM_CTL_UNK);
164		return 0;
165	}
166
167	return -EINVAL;
168}
169
170static const struct backlight_ops nva3_bl_ops = {
171	.options = BL_CORE_SUSPENDRESUME,
172	.get_brightness = nva3_get_intensity,
173	.update_status = nva3_set_intensity,
174};
175
176static int
177nv50_backlight_init(struct drm_connector *connector)
178{
179	struct nouveau_drm *drm = nouveau_drm(connector->dev);
180	struct nvif_device *device = &drm->device;
181	struct nouveau_encoder *nv_encoder;
182	struct backlight_properties props;
183	struct backlight_device *bd;
184	const struct backlight_ops *ops;
185
186	nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
187	if (!nv_encoder) {
188		nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
189		if (!nv_encoder)
190			return -ENODEV;
191	}
192
193	if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
194		return 0;
195
196	if (device->info.chipset <= 0xa0 ||
197	    device->info.chipset == 0xaa ||
198	    device->info.chipset == 0xac)
199		ops = &nv50_bl_ops;
200	else
201		ops = &nva3_bl_ops;
202
203	memset(&props, 0, sizeof(struct backlight_properties));
204	props.type = BACKLIGHT_RAW;
205	props.max_brightness = 100;
206	bd = backlight_device_register("nv_backlight", connector->kdev,
207				       nv_encoder, ops, &props);
208	if (IS_ERR(bd))
209		return PTR_ERR(bd);
210
211	drm->backlight = bd;
212	bd->props.brightness = bd->ops->get_brightness(bd);
213	backlight_update_status(bd);
214	return 0;
215}
216
217int
218nouveau_backlight_init(struct drm_device *dev)
219{
220	struct nouveau_drm *drm = nouveau_drm(dev);
221	struct nvif_device *device = &drm->device;
222	struct drm_connector *connector;
223
224	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
225		if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
226		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
227			continue;
228
229		switch (device->info.family) {
230		case NV_DEVICE_INFO_V0_CURIE:
231			return nv40_backlight_init(connector);
232		case NV_DEVICE_INFO_V0_TESLA:
233		case NV_DEVICE_INFO_V0_FERMI:
234		case NV_DEVICE_INFO_V0_KEPLER:
235			return nv50_backlight_init(connector);
236		default:
237			break;
238		}
239	}
240
241
242	return 0;
243}
244
245void
246nouveau_backlight_exit(struct drm_device *dev)
247{
248	struct nouveau_drm *drm = nouveau_drm(dev);
249
250	if (drm->backlight) {
251		backlight_device_unregister(drm->backlight);
252		drm->backlight = NULL;
253	}
254}
255