summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/nouveau/nouveau_backlight.c
blob: debbbf0fd4bdda619732c67952c772f9957c4166 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
/*
 * Copyright (C) 2009 Red Hat <mjg@redhat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

/*
 * Authors:
 *  Matthew Garrett <mjg@redhat.com>
 *
 * Register locations derived from NVClock by Roderick Colenbrander
 */

#include <linux/apple-gmux.h>
#include <linux/backlight.h>
#include <linux/idr.h>

#include "nouveau_drv.h"
#include "nouveau_reg.h"
#include "nouveau_encoder.h"

static struct ida bl_ida;
#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'

struct backlight_connector {
	struct list_head head;
	int id;
};

static bool
nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], struct backlight_connector
		*connector)
{
	const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
	if (nb < 0 || nb >= 100)
		return false;
	if (nb > 0)
		snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
	else
		snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
	connector->id = nb;
	return true;
}

static int
nv40_get_intensity(struct backlight_device *bd)
{
	struct nouveau_drm *drm = bl_get_data(bd);
	struct nvif_object *device = &drm->client.device.object;
	int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
				   NV40_PMC_BACKLIGHT_MASK) >> 16;

	return val;
}

static int
nv40_set_intensity(struct backlight_device *bd)
{
	struct nouveau_drm *drm = bl_get_data(bd);
	struct nvif_object *device = &drm->client.device.object;
	int val = bd->props.brightness;
	int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);

	nvif_wr32(device, NV40_PMC_BACKLIGHT,
		 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));

	return 0;
}

static const struct backlight_ops nv40_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nv40_get_intensity,
	.update_status = nv40_set_intensity,
};

static int
nv40_backlight_init(struct drm_connector *connector)
{
	struct nouveau_drm *drm = nouveau_drm(connector->dev);
	struct nvif_object *device = &drm->client.device.object;
	struct backlight_properties props;
	struct backlight_device *bd;
	struct backlight_connector bl_connector;
	char backlight_name[BL_NAME_SIZE];

	if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
		return 0;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 31;
	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
		NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
		return 0;
	}
	bd = backlight_device_register(backlight_name , connector->kdev, drm,
				       &nv40_bl_ops, &props);

	if (IS_ERR(bd)) {
		if (bl_connector.id > 0)
			ida_simple_remove(&bl_ida, bl_connector.id);
		return PTR_ERR(bd);
	}
	list_add(&bl_connector.head, &drm->bl_connectors);
	drm->backlight = bd;
	bd->props.brightness = nv40_get_intensity(bd);
	backlight_update_status(bd);

	return 0;
}

static int
nv50_get_intensity(struct backlight_device *bd)
{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div = 1025;
	u32 val;

	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
	return ((val * 100) + (div / 2)) / div;
}

static int
nv50_set_intensity(struct backlight_device *bd)
{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div = 1025;
	u32 val = (bd->props.brightness * div) / 100;

	nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
			NV50_PDISP_SOR_PWM_CTL_NEW | val);
	return 0;
}

static const struct backlight_ops nv50_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nv50_get_intensity,
	.update_status = nv50_set_intensity,
};

static int
nva3_get_intensity(struct backlight_device *bd)
{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div, val;

	div  = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
	if (div && div >= val)
		return ((val * 100) + (div / 2)) / div;

	return 100;
}

static int
nva3_set_intensity(struct backlight_device *bd)
{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
	struct nvif_object *device = &drm->client.device.object;
	int or = ffs(nv_encoder->dcb->or) - 1;
	u32 div, val;

	div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
	val = (bd->props.brightness * div) / 100;
	if (div) {
		nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
				NV50_PDISP_SOR_PWM_CTL_NEW |
				NVA3_PDISP_SOR_PWM_CTL_UNK);
		return 0;
	}

	return -EINVAL;
}

static const struct backlight_ops nva3_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nva3_get_intensity,
	.update_status = nva3_set_intensity,
};

static int
nv50_backlight_init(struct drm_connector *connector)
{
	struct nouveau_drm *drm = nouveau_drm(connector->dev);
	struct nvif_object *device = &drm->client.device.object;
	struct nouveau_encoder *nv_encoder;
	struct backlight_properties props;
	struct backlight_device *bd;
	const struct backlight_ops *ops;
	struct backlight_connector bl_connector;
	char backlight_name[BL_NAME_SIZE];

	nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
	if (!nv_encoder) {
		nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
		if (!nv_encoder)
			return -ENODEV;
	}

	if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)))
		return 0;

	if (drm->client.device.info.chipset <= 0xa0 ||
	    drm->client.device.info.chipset == 0xaa ||
	    drm->client.device.info.chipset == 0xac)
		ops = &nv50_bl_ops;
	else
		ops = &nva3_bl_ops;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 100;
	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
		NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
		return 0;
	}
	bd = backlight_device_register(backlight_name , connector->kdev,
				       nv_encoder, ops, &props);

	if (IS_ERR(bd)) {
		if (bl_connector.id > 0)
			ida_simple_remove(&bl_ida, bl_connector.id);
		return PTR_ERR(bd);
	}

	list_add(&bl_connector.head, &drm->bl_connectors);
	drm->backlight = bd;
	bd->props.brightness = bd->ops->get_brightness(bd);
	backlight_update_status(bd);
	return 0;
}

int
nouveau_backlight_init(struct drm_device *dev)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvif_device *device = &drm->client.device;
	struct drm_connector *connector;

	INIT_LIST_HEAD(&drm->bl_connectors);

	if (apple_gmux_present()) {
		NV_INFO(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
		return 0;
	}

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
			continue;

		switch (device->info.family) {
		case NV_DEVICE_INFO_V0_CURIE:
			return nv40_backlight_init(connector);
		case NV_DEVICE_INFO_V0_TESLA:
		case NV_DEVICE_INFO_V0_FERMI:
		case NV_DEVICE_INFO_V0_KEPLER:
		case NV_DEVICE_INFO_V0_MAXWELL:
			return nv50_backlight_init(connector);
		default:
			break;
		}
	}


	return 0;
}

void
nouveau_backlight_exit(struct drm_device *dev)
{
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct backlight_connector *connector;

	list_for_each_entry(connector, &drm->bl_connectors, head) {
		if (connector->id >= 0)
			ida_simple_remove(&bl_ida, connector->id);
	}

	if (drm->backlight) {
		backlight_device_unregister(drm->backlight);
		drm->backlight = NULL;
	}
}

void
nouveau_backlight_ctor(void)
{
	ida_init(&bl_ida);
}

void
nouveau_backlight_dtor(void)
{
	ida_destroy(&bl_ida);
}