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      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 MAX_LENGTH         50
     35 #define BOOST_SOCKET       "/dev/socket/pb"
     36 
     37 static int client_sockfd;
     38 static struct sockaddr_un client_addr;
     39 static int last_state = -1;
     40 
     41 static void socket_init()
     42 {
     43     if (!client_sockfd) {
     44         client_sockfd = socket(PF_UNIX, SOCK_DGRAM, 0);
     45         if (client_sockfd < 0) {
     46             ALOGE("%s: failed to open: %s", __func__, strerror(errno));
     47             return;
     48         }
     49         memset(&client_addr, 0, sizeof(struct sockaddr_un));
     50         client_addr.sun_family = AF_UNIX;
     51         snprintf(client_addr.sun_path, UNIX_PATH_MAX, BOOST_SOCKET);
     52     }
     53 }
     54 
     55 static void power_init(struct power_module *module)
     56 {
     57     ALOGI("%s", __func__);
     58     socket_init();
     59 }
     60 
     61 static void sync_thread(int off)
     62 {
     63     int rc;
     64     pid_t client;
     65     char data[MAX_LENGTH];
     66 
     67     if (client_sockfd < 0) {
     68         ALOGE("%s: boost socket not created", __func__);
     69         return;
     70     }
     71 
     72     client = getpid();
     73 
     74     if (!off) {
     75         snprintf(data, MAX_LENGTH, "2:%d", client);
     76         rc = sendto(client_sockfd, data, strlen(data), 0, (const struct sockaddr *)&client_addr, sizeof(struct sockaddr_un));
     77     } else {
     78         snprintf(data, MAX_LENGTH, "3:%d", client);
     79         rc = sendto(client_sockfd, data, strlen(data), 0, (const struct sockaddr *)&client_addr, sizeof(struct sockaddr_un));
     80     }
     81 
     82     if (rc < 0) {
     83         ALOGE("%s: failed to send: %s", __func__, strerror(errno));
     84     }
     85 }
     86 
     87 static void process_video_encode_hint(void *metadata)
     88 {
     89 
     90     socket_init();
     91 
     92     if (client_sockfd < 0) {
     93         ALOGE("%s: boost socket not created", __func__);
     94         return;
     95     }
     96 
     97     if (metadata) {
     98         if (!strncmp(metadata, STATE_ON, sizeof(STATE_ON))) {
     99             /* Video encode started */
    100             sync_thread(1);
    101         } else if (!strncmp(metadata, STATE_OFF, sizeof(STATE_OFF))) {
    102             /* Video encode stopped */
    103             sync_thread(0);
    104         } else
    105             return;
    106     } else {
    107         return;
    108     }
    109 
    110 }
    111 
    112 
    113 static void touch_boost()
    114 {
    115     int rc;
    116     pid_t client;
    117     char data[MAX_LENGTH];
    118 
    119     if (client_sockfd < 0) {
    120         ALOGE("%s: boost socket not created", __func__);
    121         return;
    122     }
    123 
    124     client = getpid();
    125 
    126     snprintf(data, MAX_LENGTH, "1:%d", client);
    127     rc = sendto(client_sockfd, data, strlen(data), 0, (const struct sockaddr *)&client_addr, sizeof(struct sockaddr_un));
    128     if (rc < 0) {
    129         ALOGE("%s: failed to send: %s", __func__, strerror(errno));
    130     }
    131 }
    132 
    133 static void power_set_interactive(struct power_module *module, int on)
    134 {
    135     if (last_state == -1) {
    136         last_state = on;
    137     } else {
    138         if (last_state == on)
    139             return;
    140         else
    141             last_state = on;
    142     }
    143 
    144     ALOGV("%s %s", __func__, (on ? "ON" : "OFF"));
    145     if (on) {
    146         sync_thread(0);
    147         touch_boost();
    148     } else {
    149         sync_thread(1);
    150     }
    151 }
    152 
    153 static void power_hint(struct power_module *module, power_hint_t hint,
    154                        void *data) {
    155     switch (hint) {
    156         case POWER_HINT_INTERACTION:
    157             ALOGV("POWER_HINT_INTERACTION");
    158             touch_boost();
    159             break;
    160 #if 0
    161         case POWER_HINT_VSYNC:
    162             ALOGV("POWER_HINT_VSYNC %s", (data ? "ON" : "OFF"));
    163             break;
    164 #endif
    165         case POWER_HINT_VIDEO_ENCODE:
    166             process_video_encode_hint(data);
    167             break;
    168         default:
    169              break;
    170     }
    171 }
    172 
    173 static struct hw_module_methods_t power_module_methods = {
    174     .open = NULL,
    175 };
    176 
    177 struct power_module HAL_MODULE_INFO_SYM = {
    178     .common = {
    179         .tag = HARDWARE_MODULE_TAG,
    180         .module_api_version = POWER_MODULE_API_VERSION_0_2,
    181         .hal_api_version = HARDWARE_HAL_API_VERSION,
    182         .id = POWER_HARDWARE_MODULE_ID,
    183         .name = "Qualcomm Power HAL",
    184         .author = "The Android Open Source Project",
    185         .methods = &power_module_methods,
    186     },
    187 
    188     .init = power_init,
    189     .setInteractive = power_set_interactive,
    190     .powerHint = power_hint,
    191 };
    192