hal/audio_extn/device_utils.c - LeafOS-Project/android_hardware_qcom_audio - Gitiles

 /*
  * Copyright (c) 2020, The Linux Foundation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *   * Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *   * Redistributions in binary form must reproduce the above
  *     copyright notice, this list of conditions and the following
  *     disclaimer in the documentation and/or other materials provided
  *     with the distribution.
  *   * Neither the name of The Linux Foundation nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Changes from Qualcomm Innovation Center are provided under the following license:
  * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
  * SPDX-License-Identifier: BSD-3-Clause-Clear
  *
  */

 #define LOG_TAG "device_utils"
 /*#define LOG_NDEBUG 0*/
 #define LOG_NDDEBUG 0

 #include <errno.h>
 #include <stdlib.h>
 #include <hardware/audio.h>
 #include <cutils/list.h>
 #include <log/log.h>

 #include "device_utils.h"

 /*
  * Below are the devices for which is back end is same, SLIMBUS_0_RX.
  * All these devices are handled by the internal HW codec. We can
  * enable any one of these devices at any time. An exception here is
  * 44.1k headphone which uses different backend. This is filtered
  * as different hal internal device in the code but remains same
  * as standard android device AUDIO_DEVICE_OUT_WIRED_HEADPHONE
  * for other layers.
  */
 static const uint32_t AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND_ARRAY[] = {
     AUDIO_DEVICE_OUT_EARPIECE,
     AUDIO_DEVICE_OUT_SPEAKER,
     AUDIO_DEVICE_OUT_WIRED_HEADSET,
     AUDIO_DEVICE_OUT_WIRED_HEADPHONE,
     AUDIO_DEVICE_OUT_LINE,
     AUDIO_DEVICE_OUT_SPEAKER_SAFE,
 };

 /*
  * Below are the input devices for which back end is same, SLIMBUS_0_TX.
  * All these devices are handled by the internal HW codec. We can
  * enable any one of these devices at any time
  */
 static const uint32_t AUDIO_DEVICE_IN_ALL_CODEC_BACKEND_ARRAY[] = {
     AUDIO_DEVICE_IN_BUILTIN_MIC,
     AUDIO_DEVICE_IN_WIRED_HEADSET,
     AUDIO_DEVICE_IN_VOICE_CALL,
     AUDIO_DEVICE_IN_BACK_MIC,
 };

 static const uint32_t AUDIO_DEVICE_OUT_CODEC_BACKEND_CNT =
                     AUDIO_ARRAY_SIZE(AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND_ARRAY);
 static const uint32_t AUDIO_DEVICE_IN_CODEC_BACKEND_CNT =
                     AUDIO_ARRAY_SIZE(AUDIO_DEVICE_IN_ALL_CODEC_BACKEND_ARRAY);


 int list_length(struct listnode *list)
 {
     struct listnode *node;
     int length = 0;

     if (list == NULL)
         goto done;

     for (node = list->next; node != list; node = node->next)
         ++length;
 done:
     return length;
 }

 /*
  * Returns true if devices list contains input device type.
  */
 bool is_audio_in_device_type(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && audio_is_input_device(item->type)) {
             ALOGV("%s: in device %#x", __func__, item->type);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns true if devices list contains output device type.
  */
 bool is_audio_out_device_type(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && audio_is_output_device(item->type)) {
             ALOGV("%s: out device %#x", __func__, item->type);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns true if devices list contains codec backend
  * input device type.
  */
 bool is_codec_backend_in_device_type(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item == NULL)
             return false;
         for (int i = 0; i < AUDIO_DEVICE_IN_CODEC_BACKEND_CNT; i++) {
             if (item->type == AUDIO_DEVICE_IN_ALL_CODEC_BACKEND_ARRAY[i]) {
                 ALOGV("%s: codec backend in device %#x", __func__, item->type);
                 return true;
             }
         }
     }
     return false;
 }

 /*
  * Returns true if devices list contains codec backend
  * output device type.
  */
 bool is_codec_backend_out_device_type(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item == NULL)
             return false;
         for (int i = 0; i < AUDIO_DEVICE_OUT_CODEC_BACKEND_CNT; i++) {
             if (item->type == AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND_ARRAY[i]) {
                 ALOGV("%s: codec backend out device %#x", __func__, item->type);
                 return true;
             }
         }
     }
     return false;
 }

 /* Returns true if USB input device is found in passed devices list */
 bool is_usb_in_device_type(struct listnode *devices)
 {
     struct listnode *node, *temp;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each_safe (node, temp, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && audio_is_usb_in_device(item->type)) {
             ALOGV("%s: USB in device %#x", __func__, item->type);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns true if USB output device is found in passed devices list
  */
 bool is_usb_out_device_type(struct listnode *devices)
 {
     struct listnode *node, *temp;
     struct audio_device_info *item = NULL;

     list_for_each_safe (node, temp, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && audio_is_usb_out_device(item->type)) {
             ALOGV("%s: USB out device %#x address %s", __func__,
                    item->type, item->address);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns USB device address information (card, device)
  */
 const char *get_usb_device_address(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return "";

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && (audio_is_usb_out_device(item->type) ||
                         audio_is_usb_in_device(item->type))) {
             ALOGV("%s: USB device %#x address %s", __func__,
                    item->type, item->address);
             return (const char *)&item->address[0];
         }
     }
     return "";
 }

 /*
  * Returns true if SCO output device is found in passed devices list
  */
 bool is_sco_in_device_type(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL &&
                 audio_is_bluetooth_in_sco_device(item->type)) {
             ALOGV("%s: SCO in device %#x", __func__, item->type);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns true if SCO output device is found in passed devices list
  */
 bool is_sco_out_device_type(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL &&
                 audio_is_bluetooth_out_sco_device(item->type)) {
             ALOGV("%s: SCO out device %#x", __func__, item->type);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns true if A2DP input device is found in passed devices list
  */
 bool is_a2dp_in_device_type(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && audio_is_a2dp_in_device(item->type)) {
             ALOGV("%s: A2DP in device %#x", __func__, item->type);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns true if A2DP output device is found in passed devices list
  */
 bool is_a2dp_out_device_type(struct listnode *devices)
 {
     struct listnode *node, *temp;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each_safe (node, temp, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && audio_is_a2dp_out_device(item->type)) {
             ALOGV("%s: A2DP out device %#x", __func__, item->type);
             return true;
         }
     }
     return false;
 }

 /*
  * Clear device list
  * Operation: devices = {};
  */

 int clear_devices(struct listnode *devices)
 {
     struct listnode *node, *temp;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return 0;

     list_for_each_safe (node, temp, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL) {
             list_remove(&item->list);
             free(item);
         }
     }

     return 0;
 }

 /*
  * Check if a device with given type is present in devices list
  */
 bool compare_device_type(struct listnode *devices, audio_devices_t device_type)
 {
     struct listnode *node, *temp;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each_safe (node, temp, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && (item->type == device_type)) {
             ALOGV("%s: device types %d match", __func__, device_type);
             return true;
         }
     }
     return false;
 }

 /*
  * Check if a device with given type and address is present in devices list
  */
 bool compare_device_type_and_address(struct listnode *devices,
                                      audio_devices_t type, const char* address)
 {
     struct listnode *node = devices;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && (item->type == type) &&
             (strcmp((const char *)&item->address[0], address) == 0)) {
             ALOGV("%s: device type %x and address %s match", __func__,
                 item->type, (const char *)&item->address[0]);
             return true;
         }
     }
     return false;
 }

 /*
  * Returns true if intersection of d1 and d2 is not NULL
  */
 bool compare_devices_for_any_match(struct listnode *d1, struct listnode *d2)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (d1 == NULL || d2 == NULL)
         return false;

     list_for_each (node, d1) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && compare_device_type(d2, item->type))
             return true;
     }
     return false;
 }

 /*
  * Returns all device types from list in bitfield
  * ToDo: Use of this function is not recommended.
  * It has been introduced for compatibility with legacy functions.
  * This can be removed once audio HAL switches to device
  * list usage for all audio extensions.
  */
 audio_devices_t get_device_types(struct listnode *devices)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;
     audio_devices_t device_type = AUDIO_DEVICE_NONE;

     if (devices == NULL)
         return AUDIO_DEVICE_NONE;

     list_for_each (node, devices) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL)
             device_type |= item->type;
     }
     return device_type;
 }

 /*
  * If single device in devices list is equal to passed type
  * type should represent a single device.
  */
 bool is_single_device_type_equal(struct listnode *devices,
                                  audio_devices_t type)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (devices == NULL)
         return false;

     if (list_length(devices) == 1) {
         node = devices->next;
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && (item->type == type))
             return true;
     }
     return false;
 }

 /*
  * Returns true if lists are equal in terms of device type
  * ToDO: Check if device addresses are also equal in the future
  */
 bool compare_devices(struct listnode *d1, struct listnode *d2)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;

     if (d1 == NULL && d2 == NULL)
         return true;

     if (d1 == NULL || d2 == NULL ||
             (list_length(d1) != list_length(d2)))
         return false;

     list_for_each (node, d1) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && !compare_device_type(d2, item->type))
             return false;
     }
     return true;
 }

 /*
  * Add or remove device from list denoted by head
  */
 int update_device_list(struct listnode *head, audio_devices_t type,
                        const char* address, bool add_device)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;
     struct audio_device_info *device = NULL;
     int ret = 0;

     if (head == NULL)
         goto done;

     if (type == AUDIO_DEVICE_NONE) {
         ret = -EINVAL;
         goto done;
     }

     list_for_each (node, head) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && (item->type == type)) {
             device = item;
             break;
         }
     }

     if (add_device) {
         if (device == NULL) {
             device = (struct audio_device_info *)
                         calloc (1, sizeof(struct audio_device_info));
             if (!device) {
                 ALOGE("%s: Cannot allocate memory for device_info", __func__);
                 ret = -ENOMEM;
                 goto done;
             }
             device->type = type;
             list_add_tail(head, &device->list);
         }
         strlcpy(device->address, address, AUDIO_DEVICE_MAX_ADDRESS_LEN);
         ALOGV("%s: Added device type %#x, address %s", __func__, type, address);
     } else {
         if (device != NULL) {
             list_remove(&device->list);
             free(device);
             ALOGV("%s: Removed device type %#x, address %s", __func__, type, address);
         }
     }
 done:
     return ret;
 }

 /*
  * Assign source device list to destination device list
  * Operation: dest list = source list
  */
 int assign_devices(struct listnode *dest, const struct listnode *source)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;
     int ret = 0;

     if (source == NULL || dest == NULL)
         return ret;

     if (!list_empty(dest))
         clear_devices(dest);

     list_for_each (node, source) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL)
             ret = update_device_list(dest, item->type, item->address, true);
     }
     return ret;
 }

 /*
  * Assign output devices from source device list to destination device list
  * Operation: dest devices = source output devices
  */
 int assign_output_devices(struct listnode *dest, const struct listnode *source)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;
     int ret = 0;

     if (source == NULL || dest == NULL)
         return ret;

     if (!list_empty(dest))
         clear_devices(dest);

     list_for_each (node, source) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL && audio_is_output_device(item->type))
             ret = update_device_list(dest, item->type, item->address, true);
     }
     return ret;
 }

 /*
  * Clear device list and replace it with single device
  */
 int reassign_device_list(struct listnode *device_list,
                             audio_devices_t type, char *address)
 {
     if (device_list == NULL)
         return 0;

     if (!list_empty(device_list))
         clear_devices(device_list);

     return update_device_list(device_list, type, address, true);
 }

 /*
  * Append source devices to destination devices
  * Operation: dest devices |= source devices
  */
 int append_devices(struct listnode *dest, const struct listnode *source)
 {
     struct listnode *node;
     struct audio_device_info *item = NULL;
     int ret = 0;

     if (source == NULL || dest == NULL)
         return ret;

     list_for_each (node, source) {
         item = node_to_item(node, struct audio_device_info, list);
         if (item != NULL)
             ret = update_device_list(dest, item->type, item->address, true);
     }
     return ret;
 }
	/*
	* Copyright (c) 2020, The Linux Foundation. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials provided
	* with the distribution.
	* * Neither the name of The Linux Foundation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
	* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
	* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* Changes from Qualcomm Innovation Center are provided under the following license:
	* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
	* SPDX-License-Identifier: BSD-3-Clause-Clear
	*
	*/

	#define LOG_TAG "device_utils"
	/#define LOG_NDEBUG 0/
	#define LOG_NDDEBUG 0

	#include <errno.h>
	#include <stdlib.h>
	#include <hardware/audio.h>
	#include <cutils/list.h>
	#include <log/log.h>

	#include "device_utils.h"

	/*
	* Below are the devices for which is back end is same, SLIMBUS_0_RX.
	* All these devices are handled by the internal HW codec. We can
	* enable any one of these devices at any time. An exception here is
	* 44.1k headphone which uses different backend. This is filtered
	* as different hal internal device in the code but remains same
	* as standard android device AUDIO_DEVICE_OUT_WIRED_HEADPHONE
	* for other layers.
	*/
	static const uint32_t AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND_ARRAY[] = {
	AUDIO_DEVICE_OUT_EARPIECE,
	AUDIO_DEVICE_OUT_SPEAKER,
	AUDIO_DEVICE_OUT_WIRED_HEADSET,
	AUDIO_DEVICE_OUT_WIRED_HEADPHONE,
	AUDIO_DEVICE_OUT_LINE,
	AUDIO_DEVICE_OUT_SPEAKER_SAFE,
	};

	/*
	* Below are the input devices for which back end is same, SLIMBUS_0_TX.
	* All these devices are handled by the internal HW codec. We can
	* enable any one of these devices at any time
	*/
	static const uint32_t AUDIO_DEVICE_IN_ALL_CODEC_BACKEND_ARRAY[] = {
	AUDIO_DEVICE_IN_BUILTIN_MIC,
	AUDIO_DEVICE_IN_WIRED_HEADSET,
	AUDIO_DEVICE_IN_VOICE_CALL,
	AUDIO_DEVICE_IN_BACK_MIC,
	};

	static const uint32_t AUDIO_DEVICE_OUT_CODEC_BACKEND_CNT =
	AUDIO_ARRAY_SIZE(AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND_ARRAY);
	static const uint32_t AUDIO_DEVICE_IN_CODEC_BACKEND_CNT =
	AUDIO_ARRAY_SIZE(AUDIO_DEVICE_IN_ALL_CODEC_BACKEND_ARRAY);


	int list_length(struct listnode *list)
	{
	struct listnode *node;
	int length = 0;

	if (list == NULL)
	goto done;

	for (node = list->next; node != list; node = node->next)
	++length;
	done:
	return length;
	}

	/*
	* Returns true if devices list contains input device type.
	*/
	bool is_audio_in_device_type(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && audio_is_input_device(item->type)) {
	ALOGV("%s: in device %#x", __func__, item->type);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns true if devices list contains output device type.
	*/
	bool is_audio_out_device_type(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && audio_is_output_device(item->type)) {
	ALOGV("%s: out device %#x", __func__, item->type);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns true if devices list contains codec backend
	* input device type.
	*/
	bool is_codec_backend_in_device_type(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item == NULL)
	return false;
	for (int i = 0; i < AUDIO_DEVICE_IN_CODEC_BACKEND_CNT; i++) {
	if (item->type == AUDIO_DEVICE_IN_ALL_CODEC_BACKEND_ARRAY[i]) {
	ALOGV("%s: codec backend in device %#x", __func__, item->type);
	return true;
	}
	}
	}
	return false;
	}

	/*
	* Returns true if devices list contains codec backend
	* output device type.
	*/
	bool is_codec_backend_out_device_type(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item == NULL)
	return false;
	for (int i = 0; i < AUDIO_DEVICE_OUT_CODEC_BACKEND_CNT; i++) {
	if (item->type == AUDIO_DEVICE_OUT_ALL_CODEC_BACKEND_ARRAY[i]) {
	ALOGV("%s: codec backend out device %#x", __func__, item->type);
	return true;
	}
	}
	}
	return false;
	}

	/* Returns true if USB input device is found in passed devices list */
	bool is_usb_in_device_type(struct listnode *devices)
	{
	struct listnode node, temp;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each_safe (node, temp, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && audio_is_usb_in_device(item->type)) {
	ALOGV("%s: USB in device %#x", __func__, item->type);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns true if USB output device is found in passed devices list
	*/
	bool is_usb_out_device_type(struct listnode *devices)
	{
	struct listnode node, temp;
	struct audio_device_info *item = NULL;

	list_for_each_safe (node, temp, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && audio_is_usb_out_device(item->type)) {
	ALOGV("%s: USB out device %#x address %s", __func__,
	item->type, item->address);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns USB device address information (card, device)
	*/
	const char get_usb_device_address(struct listnode devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return "";

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && (audio_is_usb_out_device(item->type) \|\|
	audio_is_usb_in_device(item->type))) {
	ALOGV("%s: USB device %#x address %s", __func__,
	item->type, item->address);
	return (const char *)&item->address[0];
	}
	}
	return "";
	}

	/*
	* Returns true if SCO output device is found in passed devices list
	*/
	bool is_sco_in_device_type(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL &&
	audio_is_bluetooth_in_sco_device(item->type)) {
	ALOGV("%s: SCO in device %#x", __func__, item->type);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns true if SCO output device is found in passed devices list
	*/
	bool is_sco_out_device_type(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL &&
	audio_is_bluetooth_out_sco_device(item->type)) {
	ALOGV("%s: SCO out device %#x", __func__, item->type);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns true if A2DP input device is found in passed devices list
	*/
	bool is_a2dp_in_device_type(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && audio_is_a2dp_in_device(item->type)) {
	ALOGV("%s: A2DP in device %#x", __func__, item->type);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns true if A2DP output device is found in passed devices list
	*/
	bool is_a2dp_out_device_type(struct listnode *devices)
	{
	struct listnode node, temp;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each_safe (node, temp, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && audio_is_a2dp_out_device(item->type)) {
	ALOGV("%s: A2DP out device %#x", __func__, item->type);
	return true;
	}
	}
	return false;
	}

	/*
	* Clear device list
	* Operation: devices = {};
	*/

	int clear_devices(struct listnode *devices)
	{
	struct listnode node, temp;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return 0;

	list_for_each_safe (node, temp, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL) {
	list_remove(&item->list);
	free(item);
	}
	}

	return 0;
	}

	/*
	* Check if a device with given type is present in devices list
	*/
	bool compare_device_type(struct listnode *devices, audio_devices_t device_type)
	{
	struct listnode node, temp;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each_safe (node, temp, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && (item->type == device_type)) {
	ALOGV("%s: device types %d match", __func__, device_type);
	return true;
	}
	}
	return false;
	}

	/*
	* Check if a device with given type and address is present in devices list
	*/
	bool compare_device_type_and_address(struct listnode *devices,
	audio_devices_t type, const char* address)
	{
	struct listnode *node = devices;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && (item->type == type) &&
	(strcmp((const char *)&item->address[0], address) == 0)) {
	ALOGV("%s: device type %x and address %s match", __func__,
	item->type, (const char *)&item->address[0]);
	return true;
	}
	}
	return false;
	}

	/*
	* Returns true if intersection of d1 and d2 is not NULL
	*/
	bool compare_devices_for_any_match(struct listnode d1, struct listnode d2)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (d1 == NULL \|\| d2 == NULL)
	return false;

	list_for_each (node, d1) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && compare_device_type(d2, item->type))
	return true;
	}
	return false;
	}

	/*
	* Returns all device types from list in bitfield
	* ToDo: Use of this function is not recommended.
	* It has been introduced for compatibility with legacy functions.
	* This can be removed once audio HAL switches to device
	* list usage for all audio extensions.
	*/
	audio_devices_t get_device_types(struct listnode *devices)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;
	audio_devices_t device_type = AUDIO_DEVICE_NONE;

	if (devices == NULL)
	return AUDIO_DEVICE_NONE;

	list_for_each (node, devices) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL)
	device_type \|= item->type;
	}
	return device_type;
	}

	/*
	* If single device in devices list is equal to passed type
	* type should represent a single device.
	*/
	bool is_single_device_type_equal(struct listnode *devices,
	audio_devices_t type)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (devices == NULL)
	return false;

	if (list_length(devices) == 1) {
	node = devices->next;
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && (item->type == type))
	return true;
	}
	return false;
	}

	/*
	* Returns true if lists are equal in terms of device type
	* ToDO: Check if device addresses are also equal in the future
	*/
	bool compare_devices(struct listnode d1, struct listnode d2)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;

	if (d1 == NULL && d2 == NULL)
	return true;

	if (d1 == NULL \|\| d2 == NULL \|\|
	(list_length(d1) != list_length(d2)))
	return false;

	list_for_each (node, d1) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && !compare_device_type(d2, item->type))
	return false;
	}
	return true;
	}

	/*
	* Add or remove device from list denoted by head
	*/
	int update_device_list(struct listnode *head, audio_devices_t type,
	const char* address, bool add_device)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;
	struct audio_device_info *device = NULL;
	int ret = 0;

	if (head == NULL)
	goto done;

	if (type == AUDIO_DEVICE_NONE) {
	ret = -EINVAL;
	goto done;
	}

	list_for_each (node, head) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && (item->type == type)) {
	device = item;
	break;
	}
	}

	if (add_device) {
	if (device == NULL) {
	device = (struct audio_device_info *)
	calloc (1, sizeof(struct audio_device_info));
	if (!device) {
	ALOGE("%s: Cannot allocate memory for device_info", __func__);
	ret = -ENOMEM;
	goto done;
	}
	device->type = type;
	list_add_tail(head, &device->list);
	}
	strlcpy(device->address, address, AUDIO_DEVICE_MAX_ADDRESS_LEN);
	ALOGV("%s: Added device type %#x, address %s", __func__, type, address);
	} else {
	if (device != NULL) {
	list_remove(&device->list);
	free(device);
	ALOGV("%s: Removed device type %#x, address %s", __func__, type, address);
	}
	}
	done:
	return ret;
	}

	/*
	* Assign source device list to destination device list
	* Operation: dest list = source list
	*/
	int assign_devices(struct listnode dest, const struct listnode source)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;
	int ret = 0;

	if (source == NULL \|\| dest == NULL)
	return ret;

	if (!list_empty(dest))
	clear_devices(dest);

	list_for_each (node, source) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL)
	ret = update_device_list(dest, item->type, item->address, true);
	}
	return ret;
	}

	/*
	* Assign output devices from source device list to destination device list
	* Operation: dest devices = source output devices
	*/
	int assign_output_devices(struct listnode dest, const struct listnode source)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;
	int ret = 0;

	if (source == NULL \|\| dest == NULL)
	return ret;

	if (!list_empty(dest))
	clear_devices(dest);

	list_for_each (node, source) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL && audio_is_output_device(item->type))
	ret = update_device_list(dest, item->type, item->address, true);
	}
	return ret;
	}

	/*
	* Clear device list and replace it with single device
	*/
	int reassign_device_list(struct listnode *device_list,
	audio_devices_t type, char *address)
	{
	if (device_list == NULL)
	return 0;

	if (!list_empty(device_list))
	clear_devices(device_list);

	return update_device_list(device_list, type, address, true);
	}

	/*
	* Append source devices to destination devices
	* Operation: dest devices \|= source devices
	*/
	int append_devices(struct listnode dest, const struct listnode source)
	{
	struct listnode *node;
	struct audio_device_info *item = NULL;
	int ret = 0;

	if (source == NULL \|\| dest == NULL)
	return ret;

	list_for_each (node, source) {
	item = node_to_item(node, struct audio_device_info, list);
	if (item != NULL)
	ret = update_device_list(dest, item->type, item->address, true);
	}
	return ret;
	}