android_hardware_UsbDevice.cpp revision c4308f01c965571dc2354107c3574df113e397ee 
1/*
2 * Copyright (C) 2010 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 "UsbDeviceJNI"
18
19#include "utils/Log.h"
20
21#include "jni.h"
22#include "JNIHelp.h"
23#include "android_runtime/AndroidRuntime.h"
24
25#include <usbhost/usbhost.h>
26
27#include <stdio.h>
28#include <sys/types.h>
29#include <sys/stat.h>
30#include <fcntl.h>
31
32using namespace android;
33
34static jfieldID field_context;
35
36struct usb_device* get_device_from_object(JNIEnv* env, jobject javaDevice)
37{
38    return (struct usb_device*)env->GetIntField(javaDevice, field_context);
39}
40
41// in android_hardware_UsbEndpoint.cpp
42extern struct usb_endpoint* get_endpoint_from_object(JNIEnv* env, jobject javaEndpoint);
43
44static jboolean
45android_hardware_UsbDevice_open(JNIEnv *env, jobject thiz, jstring deviceName,
46        jobject fileDescriptor)
47{
48    int fd = getParcelFileDescriptorFD(env, fileDescriptor);
49    // duplicate the file descriptor, since ParcelFileDescriptor will eventually close its copy
50    fd = dup(fd);
51    if (fd < 0)
52        return false;
53
54    const char *deviceNameStr = env->GetStringUTFChars(deviceName, NULL);
55    struct usb_device* device = usb_device_new(deviceNameStr, fd);
56    if (device) {
57        env->SetIntField(thiz, field_context, (int)device);
58    } else {
59        LOGE("usb_device_open failed for %s", deviceNameStr);
60        close(fd);
61    }
62
63    env->ReleaseStringUTFChars(deviceName, deviceNameStr);
64    return (device != NULL);
65}
66
67static void
68android_hardware_UsbDevice_close(JNIEnv *env, jobject thiz)
69{
70    LOGD("close\n");
71    struct usb_device* device = get_device_from_object(env, thiz);
72    if (device) {
73        usb_device_close(device);
74        env->SetIntField(thiz, field_context, 0);
75    }
76}
77
78static jint
79android_hardware_UsbDevice_get_fd(JNIEnv *env, jobject thiz)
80{
81    struct usb_device* device = get_device_from_object(env, thiz);
82    if (!device) {
83        LOGE("device is closed in native_get_fd");
84        return -1;
85    }
86    return usb_device_get_fd(device);
87}
88
89static jboolean
90android_hardware_UsbDevice_claim_interface(JNIEnv *env, jobject thiz, int interfaceID, jboolean force)
91{
92    struct usb_device* device = get_device_from_object(env, thiz);
93    if (!device) {
94        LOGE("device is closed in native_claim_interface");
95        return -1;
96    }
97
98    int ret = usb_device_claim_interface(device, interfaceID);
99    if (ret && force && errno == EBUSY) {
100        // disconnect kernel driver and try again
101        usb_device_connect_kernel_driver(device, interfaceID, false);
102        ret = usb_device_claim_interface(device, interfaceID);
103    }
104    return ret == 0;
105}
106
107static jint
108android_hardware_UsbDevice_release_interface(JNIEnv *env, jobject thiz, int interfaceID)
109{
110    struct usb_device* device = get_device_from_object(env, thiz);
111    if (!device) {
112        LOGE("device is closed in native_release_interface");
113        return -1;
114    }
115    int ret = usb_device_release_interface(device, interfaceID);
116    if (ret == 0) {
117        // allow kernel to reconnect its driver
118        usb_device_connect_kernel_driver(device, interfaceID, true);
119    }
120    return ret;
121}
122
123static jint
124android_hardware_UsbDevice_control_request(JNIEnv *env, jobject thiz,
125        jint requestType, jint request, jint value, jint index,
126        jbyteArray buffer, jint length, jint timeout)
127{
128    struct usb_device* device = get_device_from_object(env, thiz);
129    if (!device) {
130        LOGE("device is closed in native_control_request");
131        return -1;
132    }
133
134    jbyte* bufferBytes = NULL;
135    if (buffer) {
136        if (env->GetArrayLength(buffer) < length) {
137            env->ThrowNew(env->FindClass("java/lang/ArrayIndexOutOfBoundsException"), NULL);
138            return -1;
139        }
140        bufferBytes = env->GetByteArrayElements(buffer, 0);
141    }
142
143    jint result = usb_device_control_transfer(device, requestType, request,
144            value, index, bufferBytes, length, timeout);
145
146    if (bufferBytes)
147        env->ReleaseByteArrayElements(buffer, bufferBytes, 0);
148
149    return result;
150}
151
152static jint
153android_hardware_UsbDevice_bulk_request(JNIEnv *env, jobject thiz,
154        jint endpoint, jbyteArray buffer, jint length, jint timeout)
155{
156    struct usb_device* device = get_device_from_object(env, thiz);
157    if (!device) {
158        LOGE("device is closed in native_control_request");
159        return -1;
160    }
161
162    jbyte* bufferBytes = NULL;
163    if (buffer) {
164        if (env->GetArrayLength(buffer) < length) {
165            env->ThrowNew(env->FindClass("java/lang/ArrayIndexOutOfBoundsException"), NULL);
166            return -1;
167        }
168        bufferBytes = env->GetByteArrayElements(buffer, 0);
169    }
170
171    jint result = usb_device_bulk_transfer(device, endpoint, bufferBytes, length, timeout);
172
173    if (bufferBytes)
174        env->ReleaseByteArrayElements(buffer, bufferBytes, 0);
175
176    return result;
177}
178
179static jobject
180android_hardware_UsbDevice_request_wait(JNIEnv *env, jobject thiz)
181{
182    struct usb_device* device = get_device_from_object(env, thiz);
183    if (!device) {
184        LOGE("device is closed in native_request_wait");
185        return NULL;
186    }
187
188    struct usb_request* request = usb_request_wait(device);
189    if (request)
190        return (jobject)request->client_data;
191    else
192        return NULL;
193}
194
195static jstring
196android_hardware_UsbDevice_get_serial(JNIEnv *env, jobject thiz)
197{
198    struct usb_device* device = get_device_from_object(env, thiz);
199    if (!device) {
200        LOGE("device is closed in native_request_wait");
201        return NULL;
202    }
203    char* serial = usb_device_get_serial(device);
204    if (!serial)
205        return NULL;
206    jstring result = env->NewStringUTF(serial);
207    free(serial);
208    return result;
209}
210
211static jint
212android_hardware_UsbDevice_get_device_id(JNIEnv *env, jobject clazz, jstring name)
213{
214    const char *nameStr = env->GetStringUTFChars(name, NULL);
215    int id = usb_device_get_unique_id_from_name(nameStr);
216    env->ReleaseStringUTFChars(name, nameStr);
217    return id;
218}
219
220static jstring
221android_hardware_UsbDevice_get_device_name(JNIEnv *env, jobject clazz, jint id)
222{
223    char* name = usb_device_get_name_from_unique_id(id);
224    jstring result = env->NewStringUTF(name);
225    free(name);
226    return result;
227}
228
229static JNINativeMethod method_table[] = {
230    {"native_open",             "(Ljava/lang/String;Ljava/io/FileDescriptor;)Z",
231                                        (void *)android_hardware_UsbDevice_open},
232    {"native_close",            "()V",  (void *)android_hardware_UsbDevice_close},
233    {"native_get_fd",           "()I",  (void *)android_hardware_UsbDevice_get_fd},
234    {"native_claim_interface",  "(IZ)Z",(void *)android_hardware_UsbDevice_claim_interface},
235    {"native_release_interface","(I)Z", (void *)android_hardware_UsbDevice_release_interface},
236    {"native_control_request",  "(IIII[BII)I",
237                                        (void *)android_hardware_UsbDevice_control_request},
238    {"native_bulk_request",     "(I[BII)I",
239                                        (void *)android_hardware_UsbDevice_bulk_request},
240    {"native_request_wait",             "()Landroid/hardware/usb/UsbRequest;",
241                                        (void *)android_hardware_UsbDevice_request_wait},
242    { "native_get_serial",      "()Ljava/lang/String;",
243                                        (void*)android_hardware_UsbDevice_get_serial },
244
245    // static methods
246    { "native_get_device_id", "(Ljava/lang/String;)I",
247                                        (void*)android_hardware_UsbDevice_get_device_id },
248    { "native_get_device_name", "(I)Ljava/lang/String;",
249                                        (void*)android_hardware_UsbDevice_get_device_name },
250};
251
252int register_android_hardware_UsbDevice(JNIEnv *env)
253{
254    jclass clazz = env->FindClass("android/hardware/usb/UsbDevice");
255    if (clazz == NULL) {
256        LOGE("Can't find android/hardware/usb/UsbDevice");
257        return -1;
258    }
259    field_context = env->GetFieldID(clazz, "mNativeContext", "I");
260    if (field_context == NULL) {
261        LOGE("Can't find UsbDevice.mNativeContext");
262        return -1;
263    }
264
265    return AndroidRuntime::registerNativeMethods(env, "android/hardware/usb/UsbDevice",
266            method_table, NELEM(method_table));
267}
268
269