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/*
* Copyright (c) 2020 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_BLUETOOTH_SERVICES_AICS_H_
#define ZEPHYR_INCLUDE_BLUETOOTH_SERVICES_AICS_H_
/**
* @brief Audio Input Control Service (AICS)
*
* @defgroup bt_gatt_aics Audio Input Control Service (AICS)
*
* @ingroup bluetooth
* @{
*
* The Audio Input Control Service is a secondary service, and as such should not be used on its
* own, but rather in the context of another (primary) service.
*
* This API implements both the server and client functionality.
* Note that the API abstracts away the change counter in the audio input control state and will
* automatically handle any changes to that. If out of date, the client implementation will
* autonomously read the change counter value when executing a write request.
*
* [Experimental] Users should note that the APIs can change as a part of ongoing development.
*/
#include <zephyr/types.h>
#include <bluetooth/bluetooth.h>
#ifdef __cplusplus
extern "C" {
#endif
/** Audio Input Control Service mute states */
#define BT_AICS_STATE_UNMUTED 0x00
#define BT_AICS_STATE_MUTED 0x01
#define BT_AICS_STATE_MUTE_DISABLED 0x02
/** Audio Input Control Service input modes */
#define BT_AICS_MODE_MANUAL_ONLY 0x00
#define BT_AICS_MODE_AUTO_ONLY 0x01
#define BT_AICS_MODE_MANUAL 0x02
#define BT_AICS_MODE_AUTO 0x03
/** Audio Input Control Service input types */
#define BT_AICS_INPUT_TYPE_UNSPECIFIED 0x00
#define BT_AICS_INPUT_TYPE_BLUETOOTH 0x01
#define BT_AICS_INPUT_TYPE_MICROPHONE 0x02
#define BT_AICS_INPUT_TYPE_ANALOG 0x03
#define BT_AICS_INPUT_TYPE_DIGITAL 0x04
#define BT_AICS_INPUT_TYPE_RADIO 0x05
#define BT_AICS_INPUT_TYPE_STREAMING 0x06
/** Audio Input Control Service Error codes */
#define BT_AICS_ERR_INVALID_COUNTER 0x80
#define BT_AICS_ERR_OP_NOT_SUPPORTED 0x81
#define BT_AICS_ERR_MUTE_DISABLED 0x82
#define BT_AICS_ERR_OUT_OF_RANGE 0x83
#define BT_AICS_ERR_GAIN_MODE_NOT_ALLOWED 0x84
/** @brief Opaque Audio Input Control Service instance. */
struct bt_aics;
/** @brief Structure for initializing a Audio Input Control Service instance. */
struct bt_aics_register_param {
/** Initial audio input gain (-128 to 127) */
int8_t gain;
/** Initial audio input mute state */
uint8_t mute;
/** Initial audio input mode */
uint8_t gain_mode;
/** Initial audio input gain units (N * 0.1 dB) */
uint8_t units;
/** Initial audio input minimum gain */
int8_t min_gain;
/** Initial audio input maximum gain */
int8_t max_gain;
/** Initial audio input type */
uint8_t type;
/** Initial audio input status (active/inactive) */
bool status;
/** Boolean to set whether the description is writable by clients */
bool desc_writable;
/** Initial audio input description */
char *description;
/** Pointer to the callback structure. */
struct bt_aics_cb *cb;
};
/** @brief Structure for discovering a Audio Input Control Service instance. */
struct bt_aics_discover_param {
/** @brief The start handle of the discovering.
*
* Typically the @p start_handle of a @ref bt_gatt_include.
*/
uint16_t start_handle;
/** @brief The end handle of the discovering.
*
* Typically the @p end_handle of a @ref bt_gatt_include.
*/
uint16_t end_handle;
};
/**
* @brief Get a free instance of Audio Input Control Service from the pool.
*
* @return Audio Input Control Service instance in case of success or NULL in case of error.
*/
struct bt_aics *bt_aics_free_instance_get(void);
/**
* @brief Get the service declaration attribute.
*
* The first service attribute returned can be included in any other GATT service.
*
* @param aics Audio Input Control Service instance.
*
* @return Pointer to the attributes of the service.
*/
void *bt_aics_svc_decl_get(struct bt_aics *aics);
/**
* @brief Get the connection pointer of a client instance
*
* Get the Bluetooth connection pointer of a Audio Input Control Service
* client instance.
*
* @param aics Audio Input Control Service client instance pointer.
* @param conn Connection pointer.
*
* @return 0 if success, errno on failure.
*/
int bt_aics_client_conn_get(const struct bt_aics *aics, struct bt_conn **conn);
/**
* @brief Initialize the Audio Input Control Service instance.
*
* @param aics Audio Input Control Service instance.
* @param param Audio Input Control Service register parameters.
*
* @return 0 if success, errno on failure.
*/
int bt_aics_register(struct bt_aics *aics, struct bt_aics_register_param *param);
/**
* @brief Callback function for writes.
*
* @param inst The instance pointer.
* @param err Error value. 0 on success, GATT error on positive value
* or errno on negative value.
*/
typedef void (*bt_aics_write_cb)(struct bt_aics *inst, int err);
/**
* @brief Callback function for the input state.
*
* Called when the value is read,
* or if the value is changed by either the server or client.
*
* @param inst The instance pointer.
* @param err Error value. 0 on success, GATT error on positive value
* or errno on negative value.
* For notifications, this will always be 0.
* @param gain The gain setting value.
* @param mute The mute value.
* @param mode The mode value.
*/
typedef void (*bt_aics_state_cb)(struct bt_aics *inst, int err, int8_t gain,
uint8_t mute, uint8_t mode);
/**
* @brief Callback function for the gain settings.
*
* Called when the value is read,
* or if the value is changed by either the server or client.
*
* @param inst The instance pointer.
* @param err Error value. 0 on success, GATT error on positive value
* or errno on negative value.
* For notifications, this will always be 0.
* @param units The value that reflect the size of a single increment or decrement of the
* Gain Setting value in 0.1 decibel units.
* @param minimum The minimum gain allowed for the gain setting.
* @param maximum The maximum gain allowed for the gain setting.
*/
typedef void (*bt_aics_gain_setting_cb)(struct bt_aics *inst, int err,
uint8_t units, int8_t minimum,
int8_t maximum);
/**
* @brief Callback function for the input type.
*
* Called when the value is read, or if the value is changed by either the server or client.
*
* @param inst The instance pointer.
* @param err Error value. 0 on success, GATT error on positive value
* or errno on negative value.
* For notifications, this will always be 0.
* @param type The input type.
*/
typedef void (*bt_aics_type_cb)(struct bt_aics *inst, int err, uint8_t type);
/**
* @brief Callback function for the input status.
*
* Called when the value is read, or if the value is changed by either the server or client.
*
* @param inst The instance pointer.
* @param err Error value. 0 on success, GATT error on positive value
* or errno on negative value.
* For notifications, this will always be 0.
* @param active Whether the instance is active or inactive.
*/
typedef void (*bt_aics_status_cb)(struct bt_aics *inst, int err, bool active);
/**
* @brief Callback function for the description.
*
* Called when the value is read, or if the value is changed by either the server or client.
*
* @param inst The instance pointer.
* @param err Error value. 0 on success, GATT error on positive value
* or errno on negative value.
* For notifications, this will always be 0.
* @param description The description as an UTF-8 encoded string (may have been clipped).
*/
typedef void (*bt_aics_description_cb)(struct bt_aics *inst, int err,
char *description);
/**
* @brief Callback function for bt_aics_discover.
*
* This callback will usually be overwritten by the primary service that
* includes the Audio Input Control Service client.
*
* @param inst The instance pointer.
* @param err Error value. 0 on success, GATT error on positive value
* or errno on negative value.
* For notifications, this will always be 0.
*/
typedef void (*bt_aics_discover_cb)(struct bt_aics *inst, int err);
struct bt_aics_cb {
bt_aics_state_cb state;
bt_aics_gain_setting_cb gain_setting;
bt_aics_type_cb type;
bt_aics_status_cb status;
bt_aics_description_cb description;
#if defined(CONFIG_BT_AICS_CLIENT)
bt_aics_discover_cb discover;
bt_aics_write_cb set_gain;
bt_aics_write_cb unmute;
bt_aics_write_cb mute;
bt_aics_write_cb set_manual_mode;
bt_aics_write_cb set_auto_mode;
#endif /* CONFIG_BT_AICS_CLIENT */
};
/**
* @brief Discover a Audio Input Control Service.
*
* Attempts to discover a Audio Input Control Service on a server given the
* @p param.
*
* @param conn Connection to the peer with the Audio Input Control Service.
* @param inst The instance pointer.
* @param param Pointer to the parameters.
*
* @return 0 on success, errno on fail.
*/
int bt_aics_discover(struct bt_conn *conn, struct bt_aics *inst,
const struct bt_aics_discover_param *param);
/**
* @brief Deactivates a Audio Input Control Service instance.
*
* Audio Input Control Services are activated by default, but this will allow
* the server to deactivate an Audio Input Control Service.
*
* @param inst The instance pointer.
*
* @return 0 if success, errno on failure.
*/
int bt_aics_deactivate(struct bt_aics *inst);
/**
* @brief Activates a Audio Input Control Service instance.
*
* Audio Input Control Services are activated by default, but this will allow
* the server reactivate a Audio Input Control Service instance after it has
* been deactivated with @ref bt_aics_deactivate.
*
* @param inst The instance pointer.
*
* @return 0 if success, errno on failure.
*/
int bt_aics_activate(struct bt_aics *inst);
/**
* @brief Read the Audio Input Control Service input state.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_state_get(struct bt_aics *inst);
/**
* @brief Read the Audio Input Control Service gain settings.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_gain_setting_get(struct bt_aics *inst);
/**
* @brief Read the Audio Input Control Service input type.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_type_get(struct bt_aics *inst);
/**
* @brief Read the Audio Input Control Service input status.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_status_get(struct bt_aics *inst);
/**
* @brief Unmute the Audio Input Control Service input.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_unmute(struct bt_aics *inst);
/**
* @brief Mute the Audio Input Control Service input.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_mute(struct bt_aics *inst);
/**
* @brief Set input gain to manual.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_manual_gain_set(struct bt_aics *inst);
/**
* @brief Set the input gain to automatic.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_automatic_gain_set(struct bt_aics *inst);
/**
* @brief Set the input gain.
*
* @param inst The instance pointer.
* @param gain The gain to set (-128 to 127) in gain setting units
* (see @ref bt_aics_gain_setting_cb).
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_gain_set(struct bt_aics *inst, int8_t gain);
/**
* @brief Read the Audio Input Control Service description.
*
* @param inst The instance pointer.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_description_get(struct bt_aics *inst);
/**
* @brief Set the Audio Input Control Service description.
*
* @param inst The instance pointer.
* @param description The description as an UTF-8 encoded string.
*
* @return 0 on success, GATT error value on fail.
*/
int bt_aics_description_set(struct bt_aics *inst, const char *description);
/**
* @brief Get a new Audio Input Control Service client instance.
*
* @return Pointer to the instance, or NULL if no free instances are left.
*/
struct bt_aics *bt_aics_client_free_instance_get(void);
/**
* @brief Registers the callbacks for the Audio Input Control Service client.
*
* @param inst The instance pointer.
* @param cb Pointer to the callback structure.
*/
void bt_aics_client_cb_register(struct bt_aics *inst, struct bt_aics_cb *cb);
#ifdef __cplusplus
}
#endif
/**
* @}
*/
#endif /* ZEPHYR_INCLUDE_BLUETOOTH_SERVICES_AICS_H_ */