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      1 /*
      2  * Copyright (C) 2018 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 
     17 #define LOG_TAG "UsbAlsaJackDetectorJNI"
     18 #include "utils/Log.h"
     19 
     20 #include "jni.h"
     21 #include <nativehelper/JNIHelp.h>
     22 #include "android-base/strings.h"
     23 #include "android_runtime/AndroidRuntime.h"
     24 #include "android_runtime/Log.h"
     25 
     26 #include <stdio.h>
     27 #include <string.h>
     28 #include <asm/byteorder.h>
     29 #include <sys/types.h>
     30 #include <sys/stat.h>
     31 #include <fcntl.h>
     32 
     33 #include <tinyalsa/asoundlib.h>
     34 
     35 #define DRIVER_NAME "/dev/usb_accessory"
     36 
     37 #define USB_IN_JACK_SUFFIX "Input Jack"
     38 #define USB_OUT_JACK_SUFFIX "Output Jack"
     39 
     40 namespace android
     41 {
     42 
     43 static struct mixer_ctl* find_mixer_with_suffix(struct mixer* card_mixer, const char* suffix) {
     44     int id = 0;
     45     struct mixer_ctl* ctl;
     46     while ((ctl = mixer_get_ctl(card_mixer, id++)) != NULL) {
     47         const char* name = mixer_ctl_get_name(ctl);
     48         if (android::base::EndsWith(name, suffix)) {
     49           return ctl;
     50         }
     51     }
     52     return NULL;
     53 }
     54 
     55 static jboolean is_jack_connected(jint card, const char* suffix) {
     56   struct mixer* card_mixer = mixer_open(card);
     57   if (card_mixer == NULL) {
     58     return true;
     59   }
     60   struct mixer_ctl* ctl = find_mixer_with_suffix(card_mixer, suffix);
     61   if (!ctl) {
     62     return true;
     63   }
     64   mixer_ctl_update(ctl);
     65   int val = mixer_ctl_get_value(ctl, 0);
     66   ALOGI("%s - value %d\n", mixer_ctl_get_name(ctl), val);
     67   mixer_close(card_mixer);
     68 
     69   return val != 0;
     70 }
     71 
     72 static jboolean android_server_UsbAlsaJackDetector_hasJackDetect(JNIEnv* /* env */,
     73                                                                  jobject /* thiz */,
     74                                                                  jint card)
     75 {
     76     struct mixer* card_mixer = mixer_open(card);
     77     if (card_mixer == NULL) {
     78         return false;
     79     }
     80 
     81     jboolean has_jack = false;
     82     if ((find_mixer_with_suffix(card_mixer, USB_IN_JACK_SUFFIX) != NULL) ||
     83             (find_mixer_with_suffix(card_mixer, USB_OUT_JACK_SUFFIX) != NULL)) {
     84         has_jack = true;
     85     }
     86     mixer_close(card_mixer);
     87     return has_jack;
     88 }
     89 
     90 static jboolean android_server_UsbAlsaJackDetector_inputJackConnected(JNIEnv* /* env */,
     91                                                                       jobject /* thiz */,
     92                                                                       jint card)
     93 {
     94     return is_jack_connected(card, USB_IN_JACK_SUFFIX);
     95 }
     96 
     97 static jboolean android_server_UsbAlsaJackDetector_outputJackConnected(JNIEnv* /* env */,
     98                                                                        jobject /* thiz */,
     99                                                                        jint card)
    100 {
    101     return is_jack_connected(card, USB_OUT_JACK_SUFFIX);
    102 }
    103 
    104 static void android_server_UsbAlsaJackDetector_jackDetect(JNIEnv* env,
    105                                                           jobject thiz,
    106                                                           jint card) {
    107     jclass jdclass = env->GetObjectClass(thiz);
    108     jmethodID method_jackDetectCallback = env->GetMethodID(jdclass, "jackDetectCallback", "()Z");
    109     if (method_jackDetectCallback == NULL) {
    110         ALOGE("Can't find jackDetectCallback");
    111         return;
    112     }
    113 
    114     struct mixer* m = mixer_open(card);
    115     if (!m) {
    116         ALOGE("Jack detect unable to open mixer\n");
    117         return;
    118     }
    119     mixer_subscribe_events(m, 1);
    120     do {
    121 
    122         // Wait for a mixer event.  Retry if interrupted, exit on error.
    123         int retval;
    124         do {
    125             retval = mixer_wait_event(m, -1);
    126         } while (retval == -EINTR);
    127         if (retval < 0) {
    128             break;
    129         }
    130         mixer_consume_event(m);
    131     } while (env->CallBooleanMethod(thiz, method_jackDetectCallback));
    132 
    133     mixer_close(m);
    134     return;
    135 }
    136 
    137 static const JNINativeMethod method_table[] = {
    138     { "nativeHasJackDetect", "(I)Z", (void*)android_server_UsbAlsaJackDetector_hasJackDetect },
    139     { "nativeInputJackConnected",     "(I)Z",
    140             (void*)android_server_UsbAlsaJackDetector_inputJackConnected },
    141     { "nativeOutputJackConnected",    "(I)Z",
    142             (void*)android_server_UsbAlsaJackDetector_outputJackConnected },
    143     { "nativeJackDetect", "(I)Z", (void*)android_server_UsbAlsaJackDetector_jackDetect },
    144 };
    145 
    146 int register_android_server_UsbAlsaJackDetector(JNIEnv *env)
    147 {
    148     jclass clazz = env->FindClass("com/android/server/usb/UsbAlsaJackDetector");
    149     if (clazz == NULL) {
    150         ALOGE("Can't find com/android/server/usb/UsbAlsaJackDetector");
    151         return -1;
    152     }
    153 
    154     if (!jniRegisterNativeMethods(env, "com/android/server/usb/UsbAlsaJackDetector",
    155             method_table, NELEM(method_table))) {
    156       ALOGE("Can't register UsbAlsaJackDetector native methods");
    157       return -1;
    158     }
    159 
    160     return 0;
    161 }
    162 
    163 }
    164