sensors-port.c revision 9ef86366e076f45bb9a6e6e98651062bc3ad7da8 
1/*
2 * Copyright (C) 2011 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#include "android/sensors-port.h"
18#include "android/hw-sensors.h"
19
20#define  E(...)    derror(__VA_ARGS__)
21#define  W(...)    dwarning(__VA_ARGS__)
22#define  D(...)    VERBOSE_PRINT(sensors_port,__VA_ARGS__)
23#define  D_ACTIVE  VERBOSE_CHECK(sensors_port)
24
25/* Maximum number of sensors supported. */
26#define ASP_MAX_SENSOR          12
27
28/* Maximum length of a sensor message. */
29#define ASP_MAX_SENSOR_MSG      1024
30
31/* Maximum length of a sensor event. */
32#define ASP_MAX_SENSOR_EVENT    256
33
34/* Query timeout in milliseconds. */
35#define ASP_QUERY_TIMEOUT       3000
36
37/* Sensors port descriptor. */
38struct AndroidSensorsPort {
39    /* Caller identifier. */
40    void*           opaque;
41    /* Connected android device. */
42    AndroidDevice*  device;
43    /* String containing list of all available sensors. */
44    char            sensors[ASP_MAX_SENSOR * 64];
45    /* Array of available sensor names. Note that each string in this array
46     * points inside the 'sensors' buffer. */
47    const char*     sensor_list[ASP_MAX_SENSOR];
48    /* Number of available sensors. */
49    int             sensors_num;
50    /* Connection status: 1 connected, 0 - disconnected. */
51    int             is_connected;
52    /* Buffer where to receive sensor messages. */
53    char            sensor_msg[ASP_MAX_SENSOR_MSG];
54    /* Buffer where to receive sensor events. */
55    char            events[ASP_MAX_SENSOR_EVENT];
56};
57
58/* Destroys and frees the descriptor. */
59static void
60_sensors_port_free(AndroidSensorsPort* asp)
61{
62    if (asp != NULL) {
63        if (asp->device != NULL) {
64            android_device_destroy(asp->device);
65        }
66        AFREE(asp);
67    }
68}
69
70/********************************************************************************
71 *                          Sensors port callbacks
72 *******************************************************************************/
73
74/* A callback that invoked on sensor events.
75 * Param:
76 *  opaque - AndroidSensorsPort instance.
77 *  ad - Android device used by this sensors port.
78 *  msg, msgsize - Sensor event message
79 *  failure - Message receiving status.
80 */
81static void
82_on_sensor_received(void* opaque, AndroidDevice* ad, char* msg, int msgsize)
83{
84    float fvalues[3] = {0, 0, 0};
85    char sensor[ASP_MAX_SENSOR_MSG];
86    char* value;
87    int id;
88    AndroidSensorsPort* asp = (AndroidSensorsPort*)opaque;
89
90    if (errno) {
91        D("Sensors notification has failed on sensors port: %s", strerror(errno));
92        return;
93    }
94
95    /* Parse notification, separating sensor name from parameters. */
96    memcpy(sensor, msg, msgsize);
97    value = strchr(sensor, ':');
98    if (value == NULL) {
99        W("Bad format for sensor notification: %s", msg);
100        return;
101    }
102    sensor[value-sensor] = '\0';
103    value++;
104
105    id = android_sensors_get_id_from_name(sensor);
106    if (id >= 0) {
107        /* Parse the value part to get the sensor values(a, b, c) */
108        int i;
109        char* pnext;
110        char* pend = value + strlen(value);
111        for (i = 0; i < 3; i++, value = pnext + 1) {
112            pnext=strchr( value, ':' );
113            if (pnext) {
114                *pnext = 0;
115            } else {
116                pnext = pend;
117            }
118
119            if (pnext > value) {
120                if (1 != sscanf( value,"%g", &fvalues[i] )) {
121                    W("Bad parameters in sensor notification %s", msg);
122                    return;
123                }
124            }
125        }
126        android_sensors_set(id, fvalues[0], fvalues[1], fvalues[2]);
127    } else {
128        W("Unknown sensor name '%s' in '%s'", sensor, msg);
129    }
130
131    /* Listen to the next event. */
132    android_device_listen(ad, asp->events, sizeof(asp->events), _on_sensor_received);
133}
134
135/* A callback that is invoked when android device is connected (i.e. both, command
136 * and event channels have been stablished.
137 * Param:
138 *  opaque - AndroidSensorsPort instance.
139 *  ad - Android device used by this sensors port.
140 *  failure - Connections status.
141 */
142static void
143_on_device_connected(void* opaque, AndroidDevice* ad, int failure)
144{
145    if (!failure) {
146        AndroidSensorsPort* asp = (AndroidSensorsPort*)opaque;
147        asp->is_connected = 1;
148        D("Sensor emulation has started");
149        /* Initialize sensors on device. */
150        sensors_port_init_sensors(asp);
151    }
152}
153
154/* Invoked when an I/O failure occurs on a socket.
155 * Note that this callback will not be invoked on connection failures.
156 * Param:
157 *  opaque - AndroidSensorsPort instance.
158 *  ad - Android device instance
159 *  ads - Connection socket where failure has occured.
160 *  failure - Contains 'errno' indicating the reason for failure.
161 */
162static void
163_on_io_failure(void* opaque, AndroidDevice* ad, int failure)
164{
165    AndroidSensorsPort* asp = (AndroidSensorsPort*)opaque;
166    E("Sensors port got disconnected: %s", strerror(failure));
167    asp->is_connected = false;
168    android_device_disconnect(ad);
169    android_device_connect_async(ad, _on_device_connected);
170}
171
172/********************************************************************************
173 *                          Sensors port API
174 *******************************************************************************/
175
176AndroidSensorsPort*
177sensors_port_create(void* opaque)
178{
179    AndroidSensorsPort* asp;
180    char* wrk;
181    int res;
182
183    ANEW0(asp);
184    asp->opaque = opaque;
185    asp->is_connected = 0;
186
187    asp->device = android_device_init(asp, AD_SENSOR_PORT, _on_io_failure);
188    if (asp->device == NULL) {
189        _sensors_port_free(asp);
190        return NULL;
191    }
192
193    res = android_device_connect_sync(asp->device, ASP_QUERY_TIMEOUT);
194    if (res != 0) {
195        sensors_port_destroy(asp);
196        return NULL;
197    }
198
199    res = android_device_query(asp->device, "list",
200                               asp->sensors, sizeof(asp->sensors),
201                               ASP_QUERY_TIMEOUT);
202    if (res != 0) {
203        sensors_port_destroy(asp);
204        return NULL;
205    }
206
207    /* Parse sensor list. */
208    asp->sensors_num = 0;
209    wrk = asp->sensors;
210
211    while (wrk != NULL && *wrk != '\0' && *wrk != '\n') {
212        asp->sensor_list[asp->sensors_num] = wrk;
213        asp->sensors_num++;
214        wrk = strchr(wrk, '\n');
215        if (wrk != NULL) {
216            *wrk = '\0'; wrk++;
217        }
218    }
219
220    android_device_listen(asp->device, asp->events, sizeof(asp->events),
221                          _on_sensor_received);
222    return asp;
223}
224
225int
226sensors_port_init_sensors(AndroidSensorsPort* asp)
227{
228    int res, id;
229
230    /* Disable all sensors for now. Reenable only those that are emulated. */
231    res = sensors_port_disable_sensor(asp, "all");
232    if (res) {
233        return res;
234    }
235
236    /* Start listening on sensor events. */
237    res = android_device_listen(asp->device, asp->events, sizeof(asp->events),
238                                _on_sensor_received);
239    if (res) {
240        return res;
241    }
242
243    /* Walk throuh the list of enabled sensors enabling them on the device. */
244    for (id = 0; id < MAX_SENSORS; id++) {
245        if (android_sensors_get_sensor_status(id) == 1) {
246            res = sensors_port_enable_sensor(asp, android_sensors_get_name_from_id(id));
247            if (res == 0) {
248                D("Sensor '%s' is enabled on the device.",
249                  android_sensors_get_name_from_id(id));
250            }
251        }
252    }
253
254    /* Start sensor events. */
255    return sensors_port_start(asp);
256}
257
258void
259sensors_port_destroy(AndroidSensorsPort* asp)
260{
261    _sensors_port_free(asp);
262}
263
264int
265sensors_port_is_connected(AndroidSensorsPort* asp)
266{
267    return asp->is_connected;
268}
269
270int
271sensors_port_enable_sensor(AndroidSensorsPort* asp, const char* name)
272{
273    char query[1024];
274    char qresp[1024];
275    snprintf(query, sizeof(query), "enable:%s", name);
276    const int res =
277        android_device_query(asp->device, query, qresp, sizeof(qresp),
278                             ASP_QUERY_TIMEOUT);
279    if (res) {
280        if (errno) {
281            D("Query '%s' failed on I/O: %s", query, strerror(errno));
282        } else {
283            D("Query '%s' failed on device: %s", query, qresp);
284        }
285    }
286    return res;
287}
288
289int
290sensors_port_disable_sensor(AndroidSensorsPort* asp, const char* name)
291{
292    char query[1024];
293    char qresp[1024];
294    snprintf(query, sizeof(query), "disable:%s", name);
295    const int res =
296        android_device_query(asp->device, query, qresp, sizeof(qresp),
297                             ASP_QUERY_TIMEOUT);
298    if (res) {
299        if (errno) {
300            D("Query '%s' failed on I/O: %s", query, strerror(errno));
301        } else {
302            D("Query '%s' failed on device: %s", query, qresp);
303        }
304    }
305    return res;
306}
307
308int
309sensors_port_start(AndroidSensorsPort* asp)
310{
311    char qresp[ASP_MAX_SENSOR_MSG];
312    const int res =
313        android_device_query(asp->device, "start", qresp, sizeof(qresp),
314                             ASP_QUERY_TIMEOUT);
315    if (res) {
316        if (errno) {
317            D("Query 'start' failed on I/O: %s", strerror(errno));
318        } else {
319            D("Query 'start' failed on device: %s", qresp);
320        }
321    }
322    return res;
323}
324
325int
326sensors_port_stop(AndroidSensorsPort* asp)
327{
328    char qresp[ASP_MAX_SENSOR_MSG];
329    const int res =
330        android_device_query(asp->device, "stop", qresp, sizeof(qresp),
331                             ASP_QUERY_TIMEOUT);
332    if (res) {
333        if (errno) {
334            D("Query 'stop' failed on I/O: %s", strerror(errno));
335        } else {
336            D("Query 'stop' failed on device: %s", qresp);
337        }
338    }
339
340    return res;
341}
342