power.c revision 59fbd175b2373f8cafeafac594005fed412385aa 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16#include <errno.h>
17#include <string.h>
18#include <sys/types.h>
19#include <sys/stat.h>
20#include <sys/socket.h>
21#include <sys/un.h>
22#include <fcntl.h>
23#include <dlfcn.h>
24
25#define LOG_TAG "PowerHAL"
26#include <utils/Log.h>
27
28#include <hardware/hardware.h>
29#include <hardware/power.h>
30
31#define STATE_ON "state=1"
32#define STATE_OFF "state=0"
33
34#define BOOST_SOCKET       "/dev/socket/pb"
35
36static int client_sockfd;
37static struct sockaddr_un client_addr;
38static int last_state = -1;
39
40static void socket_init()
41{
42    if (!client_sockfd) {
43        client_sockfd = socket(PF_UNIX, SOCK_DGRAM, 0);
44        if (client_sockfd < 0) {
45            ALOGE("%s: failed to open: %s", __func__, strerror(errno));
46            return;
47        }
48        memset(&client_addr, 0, sizeof(struct sockaddr_un));
49        client_addr.sun_family = AF_UNIX;
50        snprintf(client_addr.sun_path, UNIX_PATH_MAX, BOOST_SOCKET);
51    }
52}
53
54static void power_init(struct power_module *module)
55{
56    ALOGI("%s", __func__);
57    socket_init();
58}
59
60static void sync_thread(int off)
61{
62    int rc;
63
64    if (client_sockfd < 0) {
65        ALOGE("%s: boost socket not created", __func__);
66        return;
67    }
68
69    if (!off) {
70        rc = sendto(client_sockfd, "2", 1, 0, (const struct sockaddr *)&client_addr, sizeof(struct sockaddr_un));
71    } else {
72        rc = sendto(client_sockfd, "3", 1, 0, (const struct sockaddr *)&client_addr, sizeof(struct sockaddr_un));
73    }
74
75    if (rc < 0) {
76        ALOGE("%s: failed to send: %s", __func__, strerror(errno));
77    }
78}
79
80static void process_video_encode_hint(void *metadata)
81{
82
83    socket_init();
84
85    if (client_sockfd < 0) {
86        ALOGE("%s: boost socket not created", __func__);
87        return;
88    }
89
90    if (metadata) {
91        if (!strncmp(metadata, STATE_ON, sizeof(STATE_ON))) {
92            /* Video encode started */
93            sync_thread(1);
94        } else if (!strncmp(metadata, STATE_OFF, sizeof(STATE_OFF))) {
95            /* Video encode stopped */
96            sync_thread(0);
97        } else
98            return;
99    } else {
100        return;
101    }
102
103}
104
105
106static void touch_boost()
107{
108    int rc;
109
110    if (client_sockfd < 0) {
111        ALOGE("%s: boost socket not created", __func__);
112        return;
113    }
114
115    rc = sendto(client_sockfd, "1", 1, 0, (const struct sockaddr *)&client_addr, sizeof(struct sockaddr_un));
116    if (rc < 0) {
117        ALOGE("%s: failed to send: %s", __func__, strerror(errno));
118    }
119}
120
121static void power_set_interactive(struct power_module *module, int on)
122{
123    if (last_state == -1) {
124        last_state = on;
125    } else {
126        if (last_state == on)
127            return;
128        else
129            last_state = on;
130    }
131
132    ALOGV("%s %s", __func__, (on ? "ON" : "OFF"));
133    if (on) {
134        sync_thread(0);
135        touch_boost();
136    } else {
137        sync_thread(1);
138    }
139}
140
141static void power_hint(struct power_module *module, power_hint_t hint,
142                       void *data) {
143    switch (hint) {
144        case POWER_HINT_INTERACTION:
145            ALOGV("POWER_HINT_INTERACTION");
146            touch_boost();
147            break;
148#if 0
149        case POWER_HINT_VSYNC:
150            ALOGV("POWER_HINT_VSYNC %s", (data ? "ON" : "OFF"));
151            break;
152#endif
153        case POWER_HINT_VIDEO_ENCODE:
154            process_video_encode_hint(data);
155            break;
156        default:
157             break;
158    }
159}
160
161static struct hw_module_methods_t power_module_methods = {
162    .open = NULL,
163};
164
165struct power_module HAL_MODULE_INFO_SYM = {
166    .common = {
167        .tag = HARDWARE_MODULE_TAG,
168        .module_api_version = POWER_MODULE_API_VERSION_0_2,
169        .hal_api_version = HARDWARE_HAL_API_VERSION,
170        .id = POWER_HARDWARE_MODULE_ID,
171        .name = "Qualcomm Power HAL",
172        .author = "The Android Open Source Project",
173        .methods = &power_module_methods,
174    },
175
176    .init = power_init,
177    .setInteractive = power_set_interactive,
178    .powerHint = power_hint,
179};
180