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 <string.h>
25#include <unistd.h>
26#include <errno.h>
27#include <fcntl.h>
28#include <pthread.h>
29
30#include <sys/ioctl.h>
31#include <sys/types.h>
32
33#include <hardware/lights.h>
34
35/******************************************************************************/
36
37static pthread_once_t g_init = PTHREAD_ONCE_INIT;
38static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
39static struct light_state_t g_notification;
40static struct light_state_t g_battery;
41static int g_attention = 0;
42
43char const*const RED_LED_FILE
44        = "/sys/class/leds/red/brightness";
45
46char const*const GREEN_LED_FILE
47        = "/sys/class/leds/green/brightness";
48
49char const*const BLUE_LED_FILE
50        = "/sys/class/leds/blue/brightness";
51
52char const*const LCD_FILE
53        = "/sys/class/leds/lcd-backlight/brightness";
54
55char const*const BUTTON_FILE
56        = "/sys/class/leds/button-backlight/brightness";
57
58char const*const RED_BLINK_FILE
59        = "/sys/class/leds/red/blink";
60
61char const*const GREEN_BLINK_FILE
62        = "/sys/class/leds/green/blink";
63
64char const*const BLUE_BLINK_FILE
65        = "/sys/class/leds/blue/blink";
66
67/**
68 * device methods
69 */
70
71void init_globals(void)
72{
73    // init the mutex
74    pthread_mutex_init(&g_lock, NULL);
75}
76
77static int
78write_int(char const* path, int value)
79{
80    int fd;
81    static int already_warned = 0;
82
83    fd = open(path, O_RDWR);
84    if (fd >= 0) {
85        char buffer[20];
86        int bytes = sprintf(buffer, "%d\n", value);
87        ssize_t amt = write(fd, buffer, (size_t)bytes);
88        close(fd);
89        return amt == -1 ? -errno : 0;
90    } else {
91        if (already_warned == 0) {
92            ALOGE("write_int failed to open %s\n", path);
93            already_warned = 1;
94        }
95        return -errno;
96    }
97}
98
99static int
100is_lit(struct light_state_t const* state)
101{
102    return state->color & 0x00ffffff;
103}
104
105static int
106rgb_to_brightness(struct light_state_t const* state)
107{
108    int color = state->color & 0x00ffffff;
109    return ((77*((color>>16)&0x00ff))
110            + (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
111}
112
113static int
114set_light_backlight(struct light_device_t* dev,
115        struct light_state_t const* state)
116{
117    int err = 0;
118    int brightness = rgb_to_brightness(state);
119    if(!dev) {
120        return -1;
121    }
122    pthread_mutex_lock(&g_lock);
123    err = write_int(LCD_FILE, brightness);
124    pthread_mutex_unlock(&g_lock);
125    return err;
126}
127
128static int
129set_speaker_light_locked(struct light_device_t* dev,
130        struct light_state_t const* state)
131{
132    int red, green, blue;
133    int blink;
134    int onMS, offMS;
135    unsigned int colorRGB;
136
137    if(!dev) {
138        return -1;
139    }
140
141    switch (state->flashMode) {
142        case LIGHT_FLASH_TIMED:
143            onMS = state->flashOnMS;
144            offMS = state->flashOffMS;
145            break;
146        case LIGHT_FLASH_NONE:
147        default:
148            onMS = 0;
149            offMS = 0;
150            break;
151    }
152
153    colorRGB = state->color;
154
155#if 0
156    ALOGD("set_speaker_light_locked mode %d, colorRGB=%08X, onMS=%d, offMS=%d\n",
157            state->flashMode, colorRGB, onMS, offMS);
158#endif
159
160    red = (colorRGB >> 16) & 0xFF;
161    green = (colorRGB >> 8) & 0xFF;
162    blue = colorRGB & 0xFF;
163
164    if (onMS > 0 && offMS > 0) {
165        blink = 1;
166    } else {
167        blink = 0;
168    }
169
170    if (blink) {
171        if (red)
172            write_int(RED_BLINK_FILE, blink);
173        if (green)
174            write_int(GREEN_BLINK_FILE, blink);
175        if (blue)
176            write_int(BLUE_BLINK_FILE, blink);
177    } else {
178        write_int(RED_LED_FILE, red);
179        write_int(GREEN_LED_FILE, green);
180        write_int(BLUE_LED_FILE, blue);
181    }
182
183    return 0;
184}
185
186static void
187handle_speaker_battery_locked(struct light_device_t* dev)
188{
189    if (is_lit(&g_battery)) {
190        set_speaker_light_locked(dev, &g_battery);
191    } else {
192        set_speaker_light_locked(dev, &g_notification);
193    }
194}
195
196static int
197set_light_notifications(struct light_device_t* dev,
198        struct light_state_t const* state)
199{
200    pthread_mutex_lock(&g_lock);
201    g_notification = *state;
202    handle_speaker_battery_locked(dev);
203    pthread_mutex_unlock(&g_lock);
204    return 0;
205}
206
207static int
208set_light_attention(struct light_device_t* dev,
209        struct light_state_t const* state)
210{
211    pthread_mutex_lock(&g_lock);
212    if (state->flashMode == LIGHT_FLASH_HARDWARE) {
213        g_attention = state->flashOnMS;
214    } else if (state->flashMode == LIGHT_FLASH_NONE) {
215        g_attention = 0;
216    }
217    handle_speaker_battery_locked(dev);
218    pthread_mutex_unlock(&g_lock);
219    return 0;
220}
221
222static int
223set_light_buttons(struct light_device_t* dev,
224        struct light_state_t const* state)
225{
226    int err = 0;
227    if(!dev) {
228        return -1;
229    }
230    pthread_mutex_lock(&g_lock);
231    err = write_int(BUTTON_FILE, state->color & 0xFF);
232    pthread_mutex_unlock(&g_lock);
233    return err;
234}
235
236/** Close the lights device */
237static int
238close_lights(struct light_device_t *dev)
239{
240    if (dev) {
241        free(dev);
242    }
243    return 0;
244}
245
246
247/******************************************************************************/
248
249/**
250 * module methods
251 */
252
253/** Open a new instance of a lights device using name */
254static int open_lights(const struct hw_module_t* module, char const* name,
255        struct hw_device_t** device)
256{
257    int (*set_light)(struct light_device_t* dev,
258            struct light_state_t const* state);
259
260    if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
261        set_light = set_light_backlight;
262    else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
263        set_light = set_light_notifications;
264    else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
265        set_light = set_light_buttons;
266    else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
267        set_light = set_light_attention;
268    else
269        return -EINVAL;
270
271    pthread_once(&g_init, init_globals);
272
273    struct light_device_t *dev = malloc(sizeof(struct light_device_t));
274    memset(dev, 0, sizeof(*dev));
275
276    dev->common.tag = HARDWARE_DEVICE_TAG;
277    dev->common.version = 0;
278    dev->common.module = (struct hw_module_t*)module;
279    dev->common.close = (int (*)(struct hw_device_t*))close_lights;
280    dev->set_light = set_light;
281
282    *device = (struct hw_device_t*)dev;
283    return 0;
284}
285
286static struct hw_module_methods_t lights_module_methods = {
287    .open =  open_lights,
288};
289
290/*
291 * The lights Module
292 */
293struct hw_module_t HAL_MODULE_INFO_SYM = {
294    .tag = HARDWARE_MODULE_TAG,
295    .version_major = 1,
296    .version_minor = 0,
297    .id = LIGHTS_HARDWARE_MODULE_ID,
298    .name = "lights Module",
299    .author = "Google, Inc.",
300    .methods = &lights_module_methods,
301};
302