1 /*
2 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above
10 * copyright notice, this list of conditions and the following
11 * disclaimer in the documentation and/or other materials provided
12 * with the distribution.
13 * * Neither the name of The Linux Foundation nor the names of its
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #define LOG_TAG "audio_hw_dev_arbi"
31 /*#define LOG_NDEBUG 0*/
32 #define LOG_NDDEBUG 0
33
34 #include <errno.h>
35 #include <cutils/log.h>
36 #include <fcntl.h>
37 #include "audio_hw.h"
38 #include "platform.h"
39 #include "platform_api.h"
40 #include <sys/stat.h>
41 #include <stdlib.h>
42 #include <dlfcn.h>
43 #include <cutils/properties.h>
44 #include "audio_extn.h"
45
46 #ifdef DEV_ARBI_ENABLED
47
48 typedef int (init_fn_t)();
49 typedef int (deinit_fn_t)();
50 typedef int (acquire_fn_t)(audio_devices_t aud_dev);
51 typedef int (release_fn_t)(audio_devices_t aud_dev);
52
53 typedef struct {
54 snd_device_t snd_device;
55 audio_devices_t aud_device;
56 } snd_aud_dev_mapping_t;
57
58 static void* lib_handle = NULL;
59
60 static init_fn_t *init_fp = NULL;
61 static deinit_fn_t *deinit_fp = NULL;
62 static acquire_fn_t *acquire_fp = NULL;
63 static release_fn_t *release_fp = NULL;
64
load_dev_arbi_lib()65 static int load_dev_arbi_lib()
66 {
67 int rc = -EINVAL;
68
69 if (lib_handle != NULL) {
70 ALOGE("%s: library already loaded", __func__);
71 return rc;
72 }
73
74 lib_handle = dlopen("libaudiodevarb.so", RTLD_NOW);
75 if (lib_handle != NULL) {
76 init_fp = (init_fn_t*)dlsym(lib_handle, "aud_dev_arbi_server_init");
77 deinit_fp = (deinit_fn_t*)dlsym(lib_handle, "aud_dev_arbi_server_deinit");
78 acquire_fp = (acquire_fn_t*)dlsym(lib_handle, "aud_dev_arbi_server_acquire");
79 release_fp = (release_fn_t*)dlsym(lib_handle, "aud_dev_arbi_server_release");
80
81 if ((init_fp == NULL) ||
82 (deinit_fp == NULL) ||
83 (acquire_fp == NULL) ||
84 (release_fp == NULL)) {
85
86 ALOGE("%s: error loading symbols from library", __func__);
87
88 init_fp = NULL;
89 deinit_fp = NULL;
90 acquire_fp = NULL;
91 release_fp = NULL;
92 } else
93 return 0;
94 }
95
96 return rc;
97 }
98
audio_extn_dev_arbi_init()99 int audio_extn_dev_arbi_init()
100 {
101 int rc = load_dev_arbi_lib();
102 if (!rc)
103 rc = init_fp();
104
105 return rc;
106 }
107
audio_extn_dev_arbi_deinit()108 int audio_extn_dev_arbi_deinit()
109 {
110 int rc = -EINVAL;
111
112 if(deinit_fp != NULL) {
113 rc = deinit_fp();
114
115 init_fp = NULL;
116 deinit_fp = NULL;
117 acquire_fp = NULL;
118 release_fp = NULL;
119
120 dlclose(lib_handle);
121 lib_handle = NULL;
122 }
123
124 return rc;
125 }
126
get_audio_device(snd_device_t snd_device)127 static audio_devices_t get_audio_device(snd_device_t snd_device)
128 {
129 static snd_aud_dev_mapping_t snd_aud_dev_map[] = {
130 {SND_DEVICE_OUT_HANDSET, AUDIO_DEVICE_OUT_EARPIECE},
131 {SND_DEVICE_OUT_VOICE_HANDSET, AUDIO_DEVICE_OUT_EARPIECE}
132 };
133
134 audio_devices_t aud_device = AUDIO_DEVICE_NONE;
135 uint32_t ind = 0;
136
137 for (ind = 0; ind < ARRAY_SIZE(snd_aud_dev_map); ++ind) {
138 if (snd_device == snd_aud_dev_map[ind].snd_device) {
139 aud_device = snd_aud_dev_map[ind].aud_device;
140 break;
141 }
142 }
143
144 return aud_device;
145 }
146
audio_extn_dev_arbi_acquire(snd_device_t snd_device)147 int audio_extn_dev_arbi_acquire(snd_device_t snd_device)
148 {
149 int rc = -EINVAL;
150 audio_devices_t audio_device = get_audio_device(snd_device);
151
152 if ((acquire_fp != NULL) && (audio_device != AUDIO_DEVICE_NONE))
153 rc = acquire_fp(audio_device);
154
155 return rc;
156 }
157
audio_extn_dev_arbi_release(snd_device_t snd_device)158 int audio_extn_dev_arbi_release(snd_device_t snd_device)
159 {
160 int rc = -EINVAL;
161 audio_devices_t audio_device = get_audio_device(snd_device);
162
163 if ((release_fp != NULL) && (audio_device != AUDIO_DEVICE_NONE))
164 rc = release_fp(audio_device);
165
166 return rc;
167 }
168
169 #endif /*DEV_ARBI_ENABLED*/
170