1 /* @file
2 * @brief Internal APIs for LE Audio
3 *
4 * Copyright (c) 2022 Codecoup
5 *
6 * SPDX-License-Identifier: Apache-2.0
7 */
8
9 #include <zephyr/bluetooth/gatt.h>
10 #include <zephyr/bluetooth/audio/audio.h>
11
12 /** @brief LE Audio Attribute User Data. */
13 struct bt_audio_attr_user_data {
14 /** Attribute read callback */
15 ssize_t (*read)(struct bt_conn *conn, const struct bt_gatt_attr *attr,
16 void *buf, uint16_t len, uint16_t offset);
17
18 /** Attribute write callback */
19 ssize_t (*write)(struct bt_conn *conn, const struct bt_gatt_attr *attr,
20 const void *buf, uint16_t len, uint16_t offset,
21 uint8_t flags);
22
23 /** Attribute user data */
24 void *user_data;
25 };
26
27 /** LE Audio Read Characteristic value helper. */
28 ssize_t bt_audio_read_chrc(struct bt_conn *conn, const struct bt_gatt_attr *attr,
29 void *buf, uint16_t len, uint16_t offset);
30
31 /** LE Audio Write Characteristic value helper. */
32 ssize_t bt_audio_write_chrc(struct bt_conn *conn, const struct bt_gatt_attr *attr,
33 const void *buf, uint16_t len, uint16_t offset, uint8_t flags);
34
35 #define BT_AUDIO_ATTR_USER_DATA_INIT(_read, _write, _user_data) \
36 { \
37 .read = _read, \
38 .write = _write, \
39 .user_data = _user_data, \
40 }
41
42 /** Helper to define LE Audio characteristic. */
43 #define BT_AUDIO_CHRC(_uuid, _props, _perm, _read, _write, _user_data) \
44 BT_GATT_CHARACTERISTIC(_uuid, _props, _perm, bt_audio_read_chrc, bt_audio_write_chrc, \
45 ((struct bt_audio_attr_user_data[]) { \
46 BT_AUDIO_ATTR_USER_DATA_INIT(_read, _write, _user_data), \
47 }))
48
49 #define BT_AUDIO_CHRC_USER_DATA(_attr) \
50 (((struct bt_audio_attr_user_data *)(_attr)->user_data)->user_data)
51
52 /** LE Audio Write CCCD value helper. */
53 ssize_t bt_audio_ccc_cfg_write(struct bt_conn *conn, const struct bt_gatt_attr *attr,
54 uint16_t value);
55
56 /** Helper to define LE Audio CCC descriptor. */
57 #define BT_AUDIO_CCC(_changed) \
58 BT_GATT_CCC_MANAGED(((struct _bt_gatt_ccc[]) \
59 {BT_GATT_CCC_INITIALIZER(_changed, bt_audio_ccc_cfg_write, NULL)}), \
60 (BT_GATT_PERM_READ | BT_GATT_PERM_WRITE_ENCRYPT))
61
bt_audio_dir_str(enum bt_audio_dir dir)62 static inline const char *bt_audio_dir_str(enum bt_audio_dir dir)
63 {
64 switch (dir) {
65 case BT_AUDIO_DIR_SINK:
66 return "sink";
67 case BT_AUDIO_DIR_SOURCE:
68 return "source";
69 }
70
71 return "Unknown";
72 }
73
