Audio RIL Interface: Initial commit, implements RIL interface

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

8 files changed, 419 insertions, 22 deletions

diff --git a/Android.mk b/Android.mk
index a510621..4a5ac4d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -23,6 +23,7 @@ LOCAL_SRC_FILES := \
 	audio_hw.c \
 	audio_out.c \
 	audio_in.c \
+	audio_ril_interface.c \
 	mixer.c
 
 LOCAL_C_INCLUDES += \
diff --git a/audio_hw.c b/audio_hw.c
index b0bda46..0292216 100644
--- a/audio_hw.c
+++ b/audio_hw.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2012 Paul Kocialkowski <contact@paulk.fr>
- * 
+ *
  * This is based on Galaxy Nexus audio.primary.tuna implementation:
  * Copyright 2011, The Android Open-Source Project
  *
@@ -20,11 +20,13 @@
 
 #define LOG_TAG "TinyALSA-Audio Hardware"
 
+#include <stdlib.h>
 #include <errno.h>
 #include <pthread.h>
 #include <stdint.h>
 #include <sys/time.h>
 
+#include <cutils/str_parms.h>
 #include <cutils/log.h>
 
 #ifdef YAMAHA_MC1N2_AUDIO
@@ -75,6 +77,7 @@ static int audio_hw_init_check(const struct audio_hw_device *dev)
 static int audio_hw_set_voice_volume(struct audio_hw_device *dev, float volume)
 {
 	struct tinyalsa_audio_device *device;
+	audio_devices_t device_modem;
 
 	LOGD("%s(%p, %f)", __func__, dev, volume);
 
@@ -86,10 +89,23 @@ static int audio_hw_set_voice_volume(struct audio_hw_device *dev, float volume)
 	if(device->mixer == NULL)
 		return -1;
 
-	if(device->mode == AUDIO_MODE_IN_CALL) {
-		// FIXME: Select the device from ril interface
-		tinyalsa_mixer_set_voice_volume(device->mixer,
-			AUDIO_DEVICE_OUT_DEFAULT, volume);
+	if(volume != device->voice_volume) {
+		if(device->mode == AUDIO_MODE_IN_CALL) {
+			if(device->ril_interface != NULL)
+				device_modem = device->ril_interface->device_current;
+			else if(device->stream_out != NULL)
+				device_modem = device->stream_out->device_current;
+			else
+				device_modem = AUDIO_DEVICE_OUT_EARPIECE;
+
+			tinyalsa_mixer_set_voice_volume(device->mixer,
+				device_modem, volume);
+
+			if(device->ril_interface != NULL)
+				audio_ril_interface_set_voice_volume(device->ril_interface, device_modem, volume);
+		}
+
+		device->voice_volume = volume;
 	}
 
 	return 0;
@@ -116,7 +132,9 @@ static int audio_hw_set_master_volume(struct audio_hw_device *dev, float volume)
 
 static int audio_hw_set_mode(struct audio_hw_device *dev, int mode)
 {
+	struct tinyalsa_audio_ril_interface *ril_interface;
 	struct tinyalsa_audio_device *device;
+	audio_devices_t device_modem;
 	int rc;
 
 	LOGD("%s(%p, %d)", __func__, dev, mode);
@@ -131,7 +149,11 @@ static int audio_hw_set_mode(struct audio_hw_device *dev, int mode)
 			tinyalsa_mixer_set_modem_state(device->mixer, 1);
 
 			if(device->stream_out != NULL)
-				tinyalsa_mixer_set_device(device->mixer, device->stream_out->device_current);
+				device_modem = device->stream_out->device_current;
+			else
+				device_modem = AUDIO_DEVICE_OUT_EARPIECE;
+
+			tinyalsa_mixer_set_device(device->mixer, device_modem);
 
 #ifdef YAMAHA_MC1N2_AUDIO
 			rc = yamaha_mc1n2_audio_modem_start(device->mc1n2_pdata);
@@ -139,6 +161,17 @@ static int audio_hw_set_mode(struct audio_hw_device *dev, int mode)
 				LOGE("Failed to set Yamaha-MC1N2-Audio route");
 			}
 #endif
+
+			rc = audio_ril_interface_open((struct audio_hw_device *) device, device_modem, &ril_interface);
+			if(rc < 0 || ril_interface == NULL) {
+				LOGE("Failed to open RIL interface");
+				device->ril_interface = NULL;
+			} else {
+				device->ril_interface = ril_interface;
+
+				if(device->voice_volume)
+					audio_ril_interface_set_voice_volume(ril_interface, device_modem, device->voice_volume);
+			}
 		} else if(device->mode == AUDIO_MODE_IN_CALL) {
 			tinyalsa_mixer_set_modem_state(device->mixer, 0);
 
@@ -148,6 +181,9 @@ static int audio_hw_set_mode(struct audio_hw_device *dev, int mode)
 				LOGE("Failed to set Yamaha-MC1N2-Audio route");
 			}
 #endif
+
+			if(device->ril_interface != NULL)
+				audio_ril_interface_close((struct audio_hw_device *) device, device->ril_interface);
 		}
 
 		device->mode = mode;
@@ -159,6 +195,7 @@ static int audio_hw_set_mode(struct audio_hw_device *dev, int mode)
 static int audio_hw_set_mic_mute(struct audio_hw_device *dev, bool state)
 {
 	struct tinyalsa_audio_device *device;
+	audio_devices_t device_modem;
 
 	LOGD("%s(%p, %d)", __func__, dev, state);
 
@@ -171,12 +208,27 @@ static int audio_hw_set_mic_mute(struct audio_hw_device *dev, bool state)
 		return -1;
 
 	if(device->mic_mute != state) {
-		device->mic_mute = state;
+		if(device->mode == AUDIO_MODE_IN_CALL) {
+			if(device->ril_interface != NULL)
+				device_modem = device->ril_interface->device_current;
+			else if(device->stream_out != NULL)
+				device_modem = device->stream_out->device_current;
+			else
+				device_modem = AUDIO_DEVICE_OUT_EARPIECE;
+
+			tinyalsa_mixer_set_mic_mute(device->mixer,
+				device_modem, state);
+
+			if(device->ril_interface != NULL)
+				audio_ril_interface_set_mic_mute(device->ril_interface, state);
+		} else {
+			if(device->stream_in != NULL) {
+				tinyalsa_mixer_set_mic_mute(device->mixer,
+					device->stream_in->device_current, state);
+			}
+		}
 
-		// FIXME: Select the device from input if mode isn't in-call,
-		// select it from ril interface if mode is in-call
-		tinyalsa_mixer_set_mic_mute(device->mixer,
-			AUDIO_DEVICE_IN_DEFAULT, state);
+		device->mic_mute = state;
 	}
 
 	return 0;
@@ -201,9 +253,50 @@ static int audio_hw_get_mic_mute(const struct audio_hw_device *dev, bool *state)
 static int audio_hw_set_parameters(struct audio_hw_device *dev,
 	const char *kvpairs)
 {
+	struct tinyalsa_audio_device *device;
+	struct str_parms *parms;
+	char value_string[32] = { 0 };
+	int value;
+	int rc;
+
 	LOGD("%s(%p, %s)", __func__, dev, kvpairs);
 
-	return -ENOSYS;
+	if(dev == NULL || kvpairs == NULL)
+		return -1;
+
+	device = (struct tinyalsa_audio_device *) dev;
+
+	if(device->mixer == NULL)
+		return -1;
+
+	parms = str_parms_create_str(kvpairs);
+	if(parms == NULL)
+		return -1;
+
+	rc = str_parms_get_str(parms, AUDIO_PARAMETER_STREAM_ROUTING, value_string, sizeof(value_string));
+	if(rc < 0)
+		goto error_params;
+
+	value = atoi(value_string);
+
+	if(audio_is_output_device((audio_devices_t) value)) {
+		if(device->stream_out != NULL && device->stream_out->device_current != (audio_devices_t) value)
+			audio_out_set_route(device->stream_out, (audio_devices_t) value);
+		if(device->ril_interface != NULL && device->ril_interface->device_current != (audio_devices_t) value)
+			audio_ril_interface_set_route(device->ril_interface, (audio_devices_t) value);
+	} else if(audio_is_input_device((audio_devices_t) value)) {
+		if(device->stream_in != NULL && device->stream_in->device_current != (audio_devices_t) value)
+			audio_in_set_route(device->stream_in, (audio_devices_t) value);
+	}
+
+	str_parms_destroy(parms);
+
+	return 0;
+
+error_params:
+	str_parms_destroy(parms);
+
+	return -1;
 }
 
 static char *audio_hw_get_parameters(const struct audio_hw_device *dev,
@@ -211,7 +304,7 @@ static char *audio_hw_get_parameters(const struct audio_hw_device *dev,
 {
 	LOGD("%s(%p, %s)", __func__, dev, keys);
 
-	return NULL;
+	return strdup("");
 }
 
 static size_t audio_hw_get_input_buffer_size(const struct audio_hw_device *dev,
@@ -270,6 +363,9 @@ int audio_hw_open(const hw_module_t *module, const char *name,
 
 	LOGD("%s(%p, %s, %p)", __func__, module, name, device);
 
+	if(device == NULL)
+		return -EINVAL;
+
 	if(strcmp(name, AUDIO_HARDWARE_INTERFACE) != 0)
 		return -EINVAL;
 
diff --git a/audio_hw.h b/audio_hw.h
index dc5d395..c7e6d05 100644
--- a/audio_hw.h
+++ b/audio_hw.h
@@ -26,6 +26,9 @@
 #include <yamaha-mc1n2-audio.h>
 #endif
 
+#include "mixer.h"
+#include "audio_ril_interface.h"
+
 struct tinyalsa_audio_stream_out {
 	struct audio_stream_out stream;
 	struct tinyalsa_audio_device *device;
@@ -63,6 +66,7 @@ struct tinyalsa_audio_device {
 
 	struct tinyalsa_audio_stream_out *stream_out;
 	struct tinyalsa_audio_stream_in *stream_in;
+	struct tinyalsa_audio_ril_interface *ril_interface;
 
 #ifdef YAMAHA_MC1N2_AUDIO
 	struct yamaha_mc1n2_audio_pdata *mc1n2_pdata;
@@ -70,22 +74,27 @@ struct tinyalsa_audio_device {
 
 	struct tinyalsa_mixer *mixer;
 	audio_mode_t mode;
+
+	float voice_volume;
 	int mic_mute;
 };
 
+int audio_out_set_route(struct tinyalsa_audio_stream_out *stream_out,
+	audio_devices_t device);
+
+void audio_hw_close_output_stream(struct audio_hw_device *dev,
+	struct audio_stream_out *stream);
 int audio_hw_open_output_stream(struct audio_hw_device *dev,
 	uint32_t devices, int *format, uint32_t *channels, uint32_t *sample_rate,
 	struct audio_stream_out **stream_out);
-void audio_hw_close_output_stream(struct audio_hw_device *dev,
-	struct audio_stream_out *stream);
 
-int audio_out_set_route(struct tinyalsa_audio_stream_out *stream_out,
+int audio_in_set_route(struct tinyalsa_audio_stream_in *stream_in,
 	audio_devices_t device);
 
+void audio_hw_close_input_stream(struct audio_hw_device *dev,
+	struct audio_stream_in *stream);
 int audio_hw_open_input_stream(struct audio_hw_device *dev,
 	uint32_t devices, int *format, uint32_t *channels, uint32_t *sample_rate,
 	audio_in_acoustics_t acoustics, struct audio_stream_in **stream_in);
-void audio_hw_close_input_stream(struct audio_hw_device *dev,
-	struct audio_stream_in *stream);
 
 #endif
diff --git a/audio_in.c b/audio_in.c
index a27ab98..560aa25 100644
--- a/audio_in.c
+++ b/audio_in.c
@@ -247,7 +247,7 @@ static int audio_in_set_parameters(struct audio_stream *stream, const char *kvpa
 
 	stream_in = (struct tinyalsa_audio_stream_in *) stream;
 
-	if(stream_in->device->mixer == NULL)
+	if(stream_in->device == NULL || stream_in->device->mixer == NULL)
 		return -1;
 
 	parms = str_parms_create_str(kvpairs);
@@ -372,10 +372,18 @@ static int audio_in_remove_audio_effect(const struct audio_stream *stream, effec
 void audio_hw_close_input_stream(struct audio_hw_device *dev,
 	struct audio_stream_in *stream)
 {
+	struct tinyalsa_audio_stream_in *stream_in;
 	struct tinyalsa_audio_device *tinyalsa_audio_device;
 
 	LOGD("%s(%p)", __func__, stream);
 
+	stream_in = (struct tinyalsa_audio_stream_in *) stream;
+
+#ifdef YAMAHA_MC1N2_AUDIO
+	if(stream_in != NULL && !stream_in->standby)
+		yamaha_mc1n2_audio_input_stop(stream_in->device->mc1n2_pdata);
+#endif
+
 	if(stream != NULL)
 		free(stream);
 
@@ -401,7 +409,7 @@ int audio_hw_open_input_stream(struct audio_hw_device *dev,
 	LOGD("%s(%p, %d, %p, %p, %p, %d, %p)",
 		__func__, dev, devices, format, channels, sample_rate, acoustics, stream_in);
 
-	if(dev == NULL)
+	if(dev == NULL || stream_in == NULL)
 		return -EINVAL;
 
 	tinyalsa_audio_device = (struct tinyalsa_audio_device *) dev;
@@ -474,6 +482,8 @@ int audio_hw_open_input_stream(struct audio_hw_device *dev,
 
 error_stream:
 	*stream_in = NULL;
+	free(tinyalsa_audio_stream_in);
+	tinyalsa_audio_device->stream_in = NULL;
 
 	return -1;
 }
diff --git a/audio_out.c b/audio_out.c
index 573dd4e..9b814a6 100644
--- a/audio_out.c
+++ b/audio_out.c
@@ -250,7 +250,7 @@ static int audio_out_set_parameters(struct audio_stream *stream, const char *kvp
 
 	stream_out = (struct tinyalsa_audio_stream_out *) stream;
 
-	if(stream_out->device->mixer == NULL)
+	if(stream_out->device == NULL || stream_out->device->mixer == NULL)
 		return -1;
 
 	parms = str_parms_create_str(kvpairs);
@@ -265,6 +265,8 @@ static int audio_out_set_parameters(struct audio_stream *stream, const char *kvp
 
 	if(stream_out->device_current != (audio_devices_t) value)
 		audio_out_set_route(stream_out, (audio_devices_t) value);
+	if(stream_out->device->ril_interface != NULL && stream_out->device->ril_interface->device_current != (audio_devices_t) value)
+		audio_ril_interface_set_route(stream_out->device->ril_interface, (audio_devices_t) value);
 
 	str_parms_destroy(parms);
 
@@ -422,7 +424,7 @@ int audio_hw_open_output_stream(struct audio_hw_device *dev,
 	LOGD("%s(%p, %d, %p, %p, %p, %p)",
 		__func__, dev, devices, format, channels, sample_rate, stream_out);
 
-	if(dev == NULL)
+	if(dev == NULL || stream_out == NULL)
 		return -EINVAL;
 
 	tinyalsa_audio_device = (struct tinyalsa_audio_device *) dev;
@@ -496,6 +498,8 @@ int audio_hw_open_output_stream(struct audio_hw_device *dev,
 
 error_stream:
 	*stream_out = NULL;
+	free(tinyalsa_audio_stream_out);
+	tinyalsa_audio_device->stream_out = NULL;
 
 	return -1;
 }
diff --git a/audio_ril_interface.c b/audio_ril_interface.c
new file mode 100644
index 0000000..d3a8658
--- /dev/null
+++ b/audio_ril_interface.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright (C) 2012 Paul Kocialkowski <contact@paulk.fr>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define LOG_TAG "TinyALSA-Audio RIL Interface"
+
+#include <stdlib.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <dlfcn.h>
+#include <sys/time.h>
+
+#include <cutils/log.h>
+
+#define EFFECT_UUID_NULL EFFECT_UUID_NULL_RIL
+#define EFFECT_UUID_NULL_STR EFFECT_UUID_NULL_STR_RIL
+#include "audio_hw.h"
+
+#include "include/audio_ril_interface.h"
+#include "audio_ril_interface.h"
+
+int audio_ril_interface_set_mic_mute(struct tinyalsa_audio_ril_interface *ril_interface, bool state)
+{
+	int rc;
+
+	if(ril_interface == NULL)
+		return -1;
+
+	LOGD("%s(%d)", __func__, state);
+
+	if(ril_interface->interface->mic_mute == NULL)
+		return -1;
+
+	rc = ril_interface->interface->mic_mute(ril_interface->interface->pdata, (int) state);
+	if(rc < 0) {
+		LOGE("Failed to set RIL interface mic mute");
+		return -1;
+	}
+
+	return 0;
+}
+
+int audio_ril_interface_set_voice_volume(struct tinyalsa_audio_ril_interface *ril_interface,
+	audio_devices_t device, float volume)
+{
+	int rc;
+
+	if(ril_interface == NULL)
+		return -1;
+
+	LOGD("%s(%d, %f)", __func__, device, volume);
+
+	if(ril_interface->interface->voice_volume == NULL)
+		return -1;
+
+	rc = ril_interface->interface->voice_volume(ril_interface->interface->pdata, device, volume);
+	if(rc < 0) {
+		LOGE("Failed to set RIL interface voice volume");
+		return -1;
+	}
+
+	return 0;
+}
+
+int audio_ril_interface_set_route(struct tinyalsa_audio_ril_interface *ril_interface, audio_devices_t device)
+{
+	int rc;
+
+	if(ril_interface == NULL)
+		return -1;
+
+	LOGD("%s(%d)", __func__, device);
+
+	ril_interface->device_current = device;
+
+	if(ril_interface->interface->route == NULL)
+		return -1;
+
+	rc = ril_interface->interface->route(ril_interface->interface->pdata, device);
+	if(rc < 0) {
+		LOGE("Failed to set RIL interface route");
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Interface
+ */
+
+void audio_ril_interface_close(struct audio_hw_device *dev,
+	struct tinyalsa_audio_ril_interface *ril_interface)
+{
+	void (*audio_ril_interface_close)(struct audio_ril_interface *interface);
+
+	struct tinyalsa_audio_device *tinyalsa_audio_device;
+
+	LOGD("%s(%p)", __func__, ril_interface);
+
+	if(ril_interface->dl_handle != NULL) {
+		audio_ril_interface_close = (void (*)(struct audio_ril_interface *interface))
+			dlsym(ril_interface->dl_handle, "audio_ril_interface_close");
+
+		if(audio_ril_interface_close == NULL) {
+			LOGE("Unable to get close function from: %s", AUDIO_RIL_INTERFACE_LIB);
+		} else {
+			audio_ril_interface_close(ril_interface->interface);
+		}
+
+		dlclose(ril_interface->dl_handle);
+		ril_interface->dl_handle = NULL;
+	}
+
+	if(ril_interface != NULL)
+		free(ril_interface);
+
+	if(dev == NULL)
+		return;
+
+	tinyalsa_audio_device = (struct tinyalsa_audio_device *) dev;
+
+	tinyalsa_audio_device->ril_interface = NULL;
+}
+
+int audio_ril_interface_open(struct audio_hw_device *dev, audio_devices_t device,
+	struct tinyalsa_audio_ril_interface **ril_interface)
+{
+	struct audio_ril_interface *(*audio_ril_interface_open)(void);
+
+	struct tinyalsa_audio_device *tinyalsa_audio_device;
+	struct tinyalsa_audio_ril_interface *tinyalsa_audio_ril_interface;
+	struct audio_ril_interface *interface;
+	void *dl_handle;
+	int rc;
+
+	LOGD("%s(%p, %d, %p)", __func__, dev, device, ril_interface);
+
+	if(dev == NULL || ril_interface == NULL)
+		return -EINVAL;
+
+	tinyalsa_audio_device = (struct tinyalsa_audio_device *) dev;
+	tinyalsa_audio_ril_interface = calloc(1, sizeof(struct tinyalsa_audio_ril_interface));
+
+	if(tinyalsa_audio_ril_interface == NULL)
+		return -ENOMEM;
+
+	tinyalsa_audio_ril_interface->device = tinyalsa_audio_device;
+	tinyalsa_audio_device->ril_interface = tinyalsa_audio_ril_interface;
+
+	dl_handle = dlopen(AUDIO_RIL_INTERFACE_LIB, RTLD_NOW);
+	if(dl_handle == NULL) {
+		LOGE("Unable to dlopen lib: %s", AUDIO_RIL_INTERFACE_LIB);
+		goto error_interface;
+	}
+
+	audio_ril_interface_open = (struct audio_ril_interface *(*)(void))
+		dlsym(dl_handle, "audio_ril_interface_open");
+	if(audio_ril_interface_open == NULL) {
+		LOGE("Unable to get open function from: %s", AUDIO_RIL_INTERFACE_LIB);
+		goto error_interface;
+	}
+
+	interface = audio_ril_interface_open();
+	if(interface == NULL) {
+		LOGE("Unable to open audio ril interface");
+		goto error_interface;
+	}
+
+	tinyalsa_audio_ril_interface->interface = interface;
+	tinyalsa_audio_ril_interface->dl_handle = dl_handle;
+
+	if(device) {
+		tinyalsa_audio_ril_interface->device_current = device;
+		audio_ril_interface_set_route(tinyalsa_audio_ril_interface, device);
+	}
+
+	*ril_interface = tinyalsa_audio_ril_interface;
+
+	return 0;
+
+error_interface:
+	*ril_interface = NULL;
+	free(tinyalsa_audio_ril_interface);
+	tinyalsa_audio_device->ril_interface = NULL;
+
+	if(dl_handle != NULL)
+		dlclose(dl_handle);
+
+	return -1;
+}
diff --git a/audio_ril_interface.h b/audio_ril_interface.h
new file mode 100644
index 0000000..c1befae
--- /dev/null
+++ b/audio_ril_interface.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2012 Paul Kocialkowski <contact@paulk.fr>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "include/audio_ril_interface.h"
+#include "audio_hw.h"
+
+#ifndef TINYALSA_AUDIO_RIL_INTERFACE_H
+#define TINYALSA_AUDIO_RIL_INTERFACE_H
+
+struct tinyalsa_audio_ril_interface {
+	struct audio_ril_interface *interface;
+	struct tinyalsa_audio_device *device;
+
+	void *dl_handle;
+
+	audio_devices_t device_current;
+};
+
+int audio_ril_interface_set_mic_mute(struct tinyalsa_audio_ril_interface *ril_interface, bool state);
+int audio_ril_interface_set_voice_volume(struct tinyalsa_audio_ril_interface *ril_interface, audio_devices_t device, float volume);
+int audio_ril_interface_set_route(struct tinyalsa_audio_ril_interface *ril_interface, audio_devices_t device);
+
+void audio_ril_interface_close(struct audio_hw_device *dev,
+	struct tinyalsa_audio_ril_interface *interface);
+int audio_ril_interface_open(struct audio_hw_device *dev, audio_devices_t device,
+	struct tinyalsa_audio_ril_interface **ril_interface);
+
+#endif
diff --git a/include/audio_ril_interface.h b/include/audio_ril_interface.h
new file mode 100644
index 0000000..eab77c1
--- /dev/null
+++ b/include/audio_ril_interface.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2012 Paul Kocialkowski <contact@paulk.fr>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TINYALSA_AUDIO_RIL_INTERFACE
+#define TINYALSA_AUDIO_RIL_INTERFACE
+
+#define AUDIO_RIL_INTERFACE_LIB	"libaudio-ril-interface.so"
+
+struct audio_ril_interface {
+	void *pdata;
+	int (*mic_mute)(void *pdata, int mute);
+	int (*voice_volume)(void *pdata, audio_devices_t device, float volume);
+	int (*route)(void *pdata, audio_devices_t device);
+};
+
+#endif