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/apple-gmux.h>
34 #include <linux/backlight.h>
35 #include <linux/idr.h>
36 
37 #include "nouveau_drv.h"
38 #include "nouveau_reg.h"
39 #include "nouveau_encoder.h"
40 
41 static struct ida bl_ida;
42 #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
43 
44 struct backlight_connector {
45 	struct list_head head;
46 	int id;
47 };
48 
49 static bool
50 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], struct backlight_connector
51 		*connector)
52 {
53 	const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
54 	if (nb < 0 || nb >= 100)
55 		return false;
56 	if (nb > 0)
57 		snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
58 	else
59 		snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
60 	connector->id = nb;
61 	return true;
62 }
63 
64 static int
65 nv40_get_intensity(struct backlight_device *bd)
66 {
67 	struct nouveau_drm *drm = bl_get_data(bd);
68 	struct nvif_object *device = &drm->client.device.object;
69 	int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
70 				   NV40_PMC_BACKLIGHT_MASK) >> 16;
71 
72 	return val;
73 }
74 
75 static int
76 nv40_set_intensity(struct backlight_device *bd)
77 {
78 	struct nouveau_drm *drm = bl_get_data(bd);
79 	struct nvif_object *device = &drm->client.device.object;
80 	int val = bd->props.brightness;
81 	int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
82 
83 	nvif_wr32(device, NV40_PMC_BACKLIGHT,
84 		 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
85 
86 	return 0;
87 }
88 
89 static const struct backlight_ops nv40_bl_ops = {
90 	.options = BL_CORE_SUSPENDRESUME,
91 	.get_brightness = nv40_get_intensity,
92 	.update_status = nv40_set_intensity,
93 };
94 
95 static int
96 nv40_backlight_init(struct drm_connector *connector)
97 {
98 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
99 	struct nvif_object *device = &drm->client.device.object;
100 	struct backlight_properties props;
101 	struct backlight_device *bd;
102 	struct backlight_connector bl_connector;
103 	char backlight_name[BL_NAME_SIZE];
104 
105 	if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
106 		return 0;
107 
108 	memset(&props, 0, sizeof(struct backlight_properties));
109 	props.type = BACKLIGHT_RAW;
110 	props.max_brightness = 31;
111 	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
112 		NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
113 		return 0;
114 	}
115 	bd = backlight_device_register(backlight_name , connector->kdev, drm,
116 				       &nv40_bl_ops, &props);
117 
118 	if (IS_ERR(bd)) {
119 		if (bl_connector.id > 0)
120 			ida_simple_remove(&bl_ida, bl_connector.id);
121 		return PTR_ERR(bd);
122 	}
123 	list_add(&bl_connector.head, &drm->bl_connectors);
124 	drm->backlight = bd;
125 	bd->props.brightness = nv40_get_intensity(bd);
126 	backlight_update_status(bd);
127 
128 	return 0;
129 }
130 
131 static int
132 nv50_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_object *device = &drm->client.device.object;
137 	int or = ffs(nv_encoder->dcb->or) - 1;
138 	u32 div = 1025;
139 	u32 val;
140 
141 	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
142 	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
143 	return ((val * 100) + (div / 2)) / div;
144 }
145 
146 static int
147 nv50_set_intensity(struct backlight_device *bd)
148 {
149 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
150 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
151 	struct nvif_object *device = &drm->client.device.object;
152 	int or = ffs(nv_encoder->dcb->or) - 1;
153 	u32 div = 1025;
154 	u32 val = (bd->props.brightness * div) / 100;
155 
156 	nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
157 			NV50_PDISP_SOR_PWM_CTL_NEW | val);
158 	return 0;
159 }
160 
161 static const struct backlight_ops nv50_bl_ops = {
162 	.options = BL_CORE_SUSPENDRESUME,
163 	.get_brightness = nv50_get_intensity,
164 	.update_status = nv50_set_intensity,
165 };
166 
167 static int
168 nva3_get_intensity(struct backlight_device *bd)
169 {
170 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
171 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
172 	struct nvif_object *device = &drm->client.device.object;
173 	int or = ffs(nv_encoder->dcb->or) - 1;
174 	u32 div, val;
175 
176 	div  = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
177 	val  = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
178 	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
179 	if (div && div >= val)
180 		return ((val * 100) + (div / 2)) / div;
181 
182 	return 100;
183 }
184 
185 static int
186 nva3_set_intensity(struct backlight_device *bd)
187 {
188 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
189 	struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
190 	struct nvif_object *device = &drm->client.device.object;
191 	int or = ffs(nv_encoder->dcb->or) - 1;
192 	u32 div, val;
193 
194 	div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
195 	val = (bd->props.brightness * div) / 100;
196 	if (div) {
197 		nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val |
198 				NV50_PDISP_SOR_PWM_CTL_NEW |
199 				NVA3_PDISP_SOR_PWM_CTL_UNK);
200 		return 0;
201 	}
202 
203 	return -EINVAL;
204 }
205 
206 static const struct backlight_ops nva3_bl_ops = {
207 	.options = BL_CORE_SUSPENDRESUME,
208 	.get_brightness = nva3_get_intensity,
209 	.update_status = nva3_set_intensity,
210 };
211 
212 static int
213 nv50_backlight_init(struct drm_connector *connector)
214 {
215 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
216 	struct nvif_object *device = &drm->client.device.object;
217 	struct nouveau_encoder *nv_encoder;
218 	struct backlight_properties props;
219 	struct backlight_device *bd;
220 	const struct backlight_ops *ops;
221 	struct backlight_connector bl_connector;
222 	char backlight_name[BL_NAME_SIZE];
223 
224 	nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
225 	if (!nv_encoder) {
226 		nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
227 		if (!nv_encoder)
228 			return -ENODEV;
229 	}
230 
231 	if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)))
232 		return 0;
233 
234 	if (drm->client.device.info.chipset <= 0xa0 ||
235 	    drm->client.device.info.chipset == 0xaa ||
236 	    drm->client.device.info.chipset == 0xac)
237 		ops = &nv50_bl_ops;
238 	else
239 		ops = &nva3_bl_ops;
240 
241 	memset(&props, 0, sizeof(struct backlight_properties));
242 	props.type = BACKLIGHT_RAW;
243 	props.max_brightness = 100;
244 	if (!nouveau_get_backlight_name(backlight_name, &bl_connector)) {
245 		NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
246 		return 0;
247 	}
248 	bd = backlight_device_register(backlight_name , connector->kdev,
249 				       nv_encoder, ops, &props);
250 
251 	if (IS_ERR(bd)) {
252 		if (bl_connector.id > 0)
253 			ida_simple_remove(&bl_ida, bl_connector.id);
254 		return PTR_ERR(bd);
255 	}
256 
257 	list_add(&bl_connector.head, &drm->bl_connectors);
258 	drm->backlight = bd;
259 	bd->props.brightness = bd->ops->get_brightness(bd);
260 	backlight_update_status(bd);
261 	return 0;
262 }
263 
264 int
265 nouveau_backlight_init(struct drm_device *dev)
266 {
267 	struct nouveau_drm *drm = nouveau_drm(dev);
268 	struct nvif_device *device = &drm->client.device;
269 	struct drm_connector *connector;
270 
271 	INIT_LIST_HEAD(&drm->bl_connectors);
272 
273 	if (apple_gmux_present()) {
274 		NV_INFO(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
275 		return 0;
276 	}
277 
278 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
279 		if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
280 		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
281 			continue;
282 
283 		switch (device->info.family) {
284 		case NV_DEVICE_INFO_V0_CURIE:
285 			return nv40_backlight_init(connector);
286 		case NV_DEVICE_INFO_V0_TESLA:
287 		case NV_DEVICE_INFO_V0_FERMI:
288 		case NV_DEVICE_INFO_V0_KEPLER:
289 		case NV_DEVICE_INFO_V0_MAXWELL:
290 			return nv50_backlight_init(connector);
291 		default:
292 			break;
293 		}
294 	}
295 
296 
297 	return 0;
298 }
299 
300 void
301 nouveau_backlight_exit(struct drm_device *dev)
302 {
303 	struct nouveau_drm *drm = nouveau_drm(dev);
304 	struct backlight_connector *connector;
305 
306 	list_for_each_entry(connector, &drm->bl_connectors, head) {
307 		if (connector->id >= 0)
308 			ida_simple_remove(&bl_ida, connector->id);
309 	}
310 
311 	if (drm->backlight) {
312 		backlight_device_unregister(drm->backlight);
313 		drm->backlight = NULL;
314 	}
315 }
316 
317 void
318 nouveau_backlight_ctor(void)
319 {
320 	ida_init(&bl_ida);
321 }
322 
323 void
324 nouveau_backlight_dtor(void)
325 {
326 	ida_destroy(&bl_ida);
327 }
328