1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * Copyright (C) 2014 The Linux Foundation. All rights reserved.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18
19 // #define LOG_NDEBUG 0
20
21 #include <cutils/log.h>
22
23 #include <stdint.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <pthread.h>
30
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
33
34 #include <hardware/lights.h>
35
36 /******************************************************************************/
37
38 static pthread_once_t g_init = PTHREAD_ONCE_INIT;
39 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
40 static struct light_state_t g_notification;
41 static struct light_state_t g_battery;
42 static int g_attention = 0;
43
44 char const*const RED_LED_FILE
45 = "/sys/class/leds/red/brightness";
46
47 char const*const GREEN_LED_FILE
48 = "/sys/class/leds/green/brightness";
49
50 char const*const BLUE_LED_FILE
51 = "/sys/class/leds/blue/brightness";
52
53 char const*const LCD_FILE
54 = "/sys/class/leds/lcd-backlight/brightness";
55
56 char const*const BUTTON_FILE
57 = "/sys/class/leds/button-backlight/brightness";
58
59 char const*const RED_BLINK_FILE
60 = "/sys/class/leds/red/blink";
61
62 char const*const GREEN_BLINK_FILE
63 = "/sys/class/leds/green/blink";
64
65 char const*const BLUE_BLINK_FILE
66 = "/sys/class/leds/blue/blink";
67
68 /**
69 * device methods
70 */
71
init_globals(void)72 void init_globals(void)
73 {
74 // init the mutex
75 pthread_mutex_init(&g_lock, NULL);
76 }
77
78 static int
write_int(char const * path,int value)79 write_int(char const* path, int value)
80 {
81 int fd;
82 static int already_warned = 0;
83
84 fd = open(path, O_RDWR);
85 if (fd >= 0) {
86 char buffer[20];
87 int bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);
88 ssize_t amt = write(fd, buffer, (size_t)bytes);
89 close(fd);
90 return amt == -1 ? -errno : 0;
91 } else {
92 if (already_warned == 0) {
93 ALOGE("write_int failed to open %s\n", path);
94 already_warned = 1;
95 }
96 return -errno;
97 }
98 }
99
100 static int
is_lit(struct light_state_t const * state)101 is_lit(struct light_state_t const* state)
102 {
103 return state->color & 0x00ffffff;
104 }
105
106 static int
rgb_to_brightness(struct light_state_t const * state)107 rgb_to_brightness(struct light_state_t const* state)
108 {
109 int color = state->color & 0x00ffffff;
110 return ((77*((color>>16)&0x00ff))
111 + (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
112 }
113
114 static int
set_light_backlight(struct light_device_t * dev,struct light_state_t const * state)115 set_light_backlight(struct light_device_t* dev,
116 struct light_state_t const* state)
117 {
118 int err = 0;
119 int brightness = rgb_to_brightness(state);
120 if(!dev) {
121 return -1;
122 }
123 pthread_mutex_lock(&g_lock);
124 err = write_int(LCD_FILE, brightness);
125 pthread_mutex_unlock(&g_lock);
126 return err;
127 }
128
129 static int
set_speaker_light_locked(struct light_device_t * dev,struct light_state_t const * state)130 set_speaker_light_locked(struct light_device_t* dev,
131 struct light_state_t const* state)
132 {
133 int red, green, blue;
134 int blink;
135 int onMS, offMS;
136 unsigned int colorRGB;
137
138 if(!dev) {
139 return -1;
140 }
141
142 switch (state->flashMode) {
143 case LIGHT_FLASH_TIMED:
144 onMS = state->flashOnMS;
145 offMS = state->flashOffMS;
146 break;
147 case LIGHT_FLASH_NONE:
148 default:
149 onMS = 0;
150 offMS = 0;
151 break;
152 }
153
154 colorRGB = state->color;
155
156 #if 0
157 ALOGD("set_speaker_light_locked mode %d, colorRGB=%08X, onMS=%d, offMS=%d\n",
158 state->flashMode, colorRGB, onMS, offMS);
159 #endif
160
161 red = (colorRGB >> 16) & 0xFF;
162 green = (colorRGB >> 8) & 0xFF;
163 blue = colorRGB & 0xFF;
164
165 if (onMS > 0 && offMS > 0) {
166 /*
167 * if ON time == OFF time
168 * use blink mode 2
169 * else
170 * use blink mode 1
171 */
172 if (onMS == offMS)
173 blink = 2;
174 else
175 blink = 1;
176 } else {
177 blink = 0;
178 }
179
180 if (blink) {
181 if (red) {
182 if (write_int(RED_BLINK_FILE, blink))
183 write_int(RED_LED_FILE, 0);
184 }
185 if (green) {
186 if (write_int(GREEN_BLINK_FILE, blink))
187 write_int(GREEN_LED_FILE, 0);
188 }
189 if (blue) {
190 if (write_int(BLUE_BLINK_FILE, blink))
191 write_int(BLUE_LED_FILE, 0);
192 }
193 } else {
194 write_int(RED_LED_FILE, red);
195 write_int(GREEN_LED_FILE, green);
196 write_int(BLUE_LED_FILE, blue);
197 }
198
199 return 0;
200 }
201
202 static void
handle_speaker_battery_locked(struct light_device_t * dev)203 handle_speaker_battery_locked(struct light_device_t* dev)
204 {
205 if (is_lit(&g_battery)) {
206 set_speaker_light_locked(dev, &g_battery);
207 } else {
208 set_speaker_light_locked(dev, &g_notification);
209 }
210 }
211
212 static int
set_light_battery(struct light_device_t * dev,struct light_state_t const * state)213 set_light_battery(struct light_device_t* dev,
214 struct light_state_t const* state)
215 {
216 pthread_mutex_lock(&g_lock);
217 g_battery = *state;
218 handle_speaker_battery_locked(dev);
219 pthread_mutex_unlock(&g_lock);
220 return 0;
221 }
222
223 static int
set_light_notifications(struct light_device_t * dev,struct light_state_t const * state)224 set_light_notifications(struct light_device_t* dev,
225 struct light_state_t const* state)
226 {
227 pthread_mutex_lock(&g_lock);
228 g_notification = *state;
229 handle_speaker_battery_locked(dev);
230 pthread_mutex_unlock(&g_lock);
231 return 0;
232 }
233
234 static int
set_light_attention(struct light_device_t * dev,struct light_state_t const * state)235 set_light_attention(struct light_device_t* dev,
236 struct light_state_t const* state)
237 {
238 pthread_mutex_lock(&g_lock);
239 if (state->flashMode == LIGHT_FLASH_HARDWARE) {
240 g_attention = state->flashOnMS;
241 } else if (state->flashMode == LIGHT_FLASH_NONE) {
242 g_attention = 0;
243 }
244 handle_speaker_battery_locked(dev);
245 pthread_mutex_unlock(&g_lock);
246 return 0;
247 }
248
249 static int
set_light_buttons(struct light_device_t * dev,struct light_state_t const * state)250 set_light_buttons(struct light_device_t* dev,
251 struct light_state_t const* state)
252 {
253 int err = 0;
254 if(!dev) {
255 return -1;
256 }
257 pthread_mutex_lock(&g_lock);
258 err = write_int(BUTTON_FILE, state->color & 0xFF);
259 pthread_mutex_unlock(&g_lock);
260 return err;
261 }
262
263 /** Close the lights device */
264 static int
close_lights(struct light_device_t * dev)265 close_lights(struct light_device_t *dev)
266 {
267 if (dev) {
268 free(dev);
269 }
270 return 0;
271 }
272
273
274 /******************************************************************************/
275
276 /**
277 * module methods
278 */
279
280 /** Open a new instance of a lights device using name */
open_lights(const struct hw_module_t * module,char const * name,struct hw_device_t ** device)281 static int open_lights(const struct hw_module_t* module, char const* name,
282 struct hw_device_t** device)
283 {
284 int (*set_light)(struct light_device_t* dev,
285 struct light_state_t const* state);
286
287 if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
288 set_light = set_light_backlight;
289 else if (0 == strcmp(LIGHT_ID_BATTERY, name))
290 set_light = set_light_battery;
291 else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
292 set_light = set_light_notifications;
293 else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
294 set_light = set_light_buttons;
295 else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
296 set_light = set_light_attention;
297 else
298 return -EINVAL;
299
300 pthread_once(&g_init, init_globals);
301
302 struct light_device_t *dev = malloc(sizeof(struct light_device_t));
303
304 if(!dev)
305 return -ENOMEM;
306
307 memset(dev, 0, sizeof(*dev));
308
309 dev->common.tag = HARDWARE_DEVICE_TAG;
310 dev->common.version = 0;
311 dev->common.module = (struct hw_module_t*)module;
312 dev->common.close = (int (*)(struct hw_device_t*))close_lights;
313 dev->set_light = set_light;
314
315 *device = (struct hw_device_t*)dev;
316 return 0;
317 }
318
319 static struct hw_module_methods_t lights_module_methods = {
320 .open = open_lights,
321 };
322
323 /*
324 * The lights Module
325 */
326 struct hw_module_t HAL_MODULE_INFO_SYM = {
327 .tag = HARDWARE_MODULE_TAG,
328 .version_major = 1,
329 .version_minor = 0,
330 .id = LIGHTS_HARDWARE_MODULE_ID,
331 .name = "lights Module",
332 .author = "Google, Inc.",
333 .methods = &lights_module_methods,
334 };
335