audiod/AudioDaemon.cpp

/* AudioDaemon.cpp
Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.

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    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
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THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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#define LOG_TAG "AudioDaemon"
#define LOG_NDEBUG 0
#define LOG_NDDEBUG 0

#include <media/AudioSystem.h>
#include <sys/poll.h>

#include "AudioDaemon.h"

int pil_fd;
#define NUM_FD 1
int bootup_complete = 0;
char adsp_pil_state_file[] = "/sys/kernel/audio_voice_service/status";

namespace android {

    AudioDaemon::AudioDaemon() : Thread(false) {
    }

    AudioDaemon::~AudioDaemon() {
    }

    void AudioDaemon::onFirstRef() {
        ALOGV("Start audiod daemon");
        run("AudioDaemon", PRIORITY_AUDIO);
    }

    void AudioDaemon::binderDied(const wp<IBinder>& who)
    {
        requestExit();
    }


    status_t AudioDaemon::readyToRun() {

        ALOGV("readyToRun: open adsp sysfs node file: %s", adsp_pil_state_file);

        pil_fd = open(adsp_pil_state_file, O_RDONLY);

        if (pil_fd < 0) {
            ALOGE("File %s open failed (%s)", adsp_pil_state_file, strerror(errno));
            return errno;
        }
        return NO_ERROR;
    }

    bool AudioDaemon::threadLoop()
    {
        int max = -1;
        int ret;
        adsp_status cur_state = adsp_offline;
        struct pollfd pfd[NUM_FD];
        char rd_buf[9];

        ALOGV("Start threadLoop()");

        if (pil_fd < 0)
            pil_fd = open(adsp_pil_state_file, O_RDONLY);

        if (pil_fd < 0) {
            ALOGE("File %s open failed (%s)", adsp_pil_state_file, strerror(errno));
            return false;
        }

        pfd[0].fd = pil_fd;
        pfd[0].events = POLLPRI;

        while (1) {
           ALOGD("poll() for adsp state change ");
           if (poll(pfd, 1, -1) < 0) {
              ALOGE("poll() failed (%s)", strerror(errno));
              return false;
           }

           ALOGD("out of poll() for adsp state change ");
           if (pfd[0].revents & POLLPRI) {
               if (!read(pil_fd, (void *)rd_buf, 8)) {
                   ALOGE("Error receiving adsp_state event (%s)", strerror(errno));
               } else {
                   rd_buf[8] = '\0';
                   ALOGV("adsp state file content: %s",rd_buf);
                   lseek(pil_fd, 0, SEEK_SET);

                   if (!strncmp(rd_buf, "OFFLINE", strlen("OFFLINE"))) {
                       cur_state = adsp_offline;
                   } else if (!strncmp(rd_buf, "ONLINE", strlen("ONLINE"))) {
                       cur_state = adsp_online;
                   }

                   if (bootup_complete) {
                       notifyAudioSystem(cur_state);
                   }

                   if (cur_state == adsp_online && !bootup_complete) {
                       bootup_complete = 1;
                       ALOGV("adsp is up, device bootup time");
                   }
               }
           }
       }

       ALOGV("Exiting Poll ThreadLoop");
       return true;
    }

    void AudioDaemon::notifyAudioSystem(adsp_status status) {

        ALOGV("notifyAudioSystem : %d", status);
        switch (status) {
        case adsp_online:
            ALOGV("notifyAudioSystem : ADSP_STATUS=ONLINE");
            AudioSystem::setParameters(0, String8("ADSP_STATUS=ONLINE"));
            break;
        case adsp_offline:
            ALOGV("notifyAudioSystem : ADSP_STATUS=OFFLINE");
            AudioSystem::setParameters(0, String8("ADSP_STATUS=OFFLINE"));
            break;
        }
    }
}