This implements the server role for the Audio Streaming for Hearing Aid specification[1]. Includes basic ability to probe the ASHA GATT service, as well as starting/stopping streaming. [1] https://source.android.com/docs/core/connect/bluetooth/asha --- Makefile.am | 3 +- configure.ac | 4 + lib/uuid.h | 3 + profiles/audio/media.c | 30 +++ profiles/audio/media.h | 2 + profiles/audio/transport.c | 173 ++++++++++++- src/shared/asha.c | 505 +++++++++++++++++++++++++++++++++++++ src/shared/asha.h | 73 ++++++ 8 files changed, 790 insertions(+), 3 deletions(-) create mode 100644 src/shared/asha.c create mode 100644 src/shared/asha.h diff --git a/Makefile.am b/Makefile.am index 05d02932f..3e6610017 100644 --- a/Makefile.am +++ b/Makefile.am @@ -238,7 +238,8 @@ shared_sources = src/shared/io.h src/shared/timeout.h \ src/shared/bass.h src/shared/bass.c \ src/shared/ccp.h src/shared/ccp.c \ src/shared/lc3.h src/shared/tty.h \ - src/shared/bap-defs.h + src/shared/bap-defs.h \ + src/shared/asha.h src/shared/asha.c if READLINE shared_sources += src/shared/shell.c src/shared/shell.h diff --git a/configure.ac b/configure.ac index 8b3cdb4e8..213e36b32 100644 --- a/configure.ac +++ b/configure.ac @@ -216,6 +216,10 @@ AC_ARG_ENABLE(csip, AS_HELP_STRING([--disable-csip], [disable CSIP profile]), [enable_csip=${enableval}]) AM_CONDITIONAL(CSIP, test "${enable_csip}" != "no") +AC_ARG_ENABLE(asha, AS_HELP_STRING([--disable-asha], + [disable ASHA support]), [enable_asha=${enableval}]) +AM_CONDITIONAL(ASHA, test "${enable_asha}" != "no") + AC_ARG_ENABLE(tools, AS_HELP_STRING([--disable-tools], [disable Bluetooth tools]), [enable_tools=${enableval}]) AM_CONDITIONAL(TOOLS, test "${enable_tools}" != "no") diff --git a/lib/uuid.h b/lib/uuid.h index 8404b287e..479986f06 100644 --- a/lib/uuid.h +++ b/lib/uuid.h @@ -163,6 +163,9 @@ extern "C" { #define BAA_SERVICE 0x1851 #define BAA_SERVICE_UUID "00001851-0000-1000-8000-00805f9b34fb" +#define ASHA_SERVICE 0xFDF0 +#define ASHA_PROFILE_UUID "0000FDF0-0000-1000-8000-00805f9b34fb" + #define PAC_CONTEXT 0x2bcd #define PAC_SUPPORTED_CONTEXT 0x2bce diff --git a/profiles/audio/media.c b/profiles/audio/media.c index 4bbd584de..b5644736a 100644 --- a/profiles/audio/media.c +++ b/profiles/audio/media.c @@ -38,6 +38,7 @@ #include "src/log.h" #include "src/error.h" #include "src/gatt-database.h" +#include "src/shared/asha.h" #include "src/shared/util.h" #include "src/shared/queue.h" #include "src/shared/att.h" @@ -88,6 +89,7 @@ struct endpoint_request { struct media_endpoint { struct a2dp_sep *sep; struct bt_bap_pac *pac; + struct bt_asha_device *asha; char *sender; /* Endpoint DBus bus id */ char *path; /* Endpoint object path */ char *uuid; /* Endpoint property UUID */ @@ -1330,6 +1332,12 @@ static bool endpoint_init_broadcast_sink(struct media_endpoint *endpoint, return endpoint_init_pac(endpoint, BT_BAP_BCAST_SINK, err); } +static bool endpoint_init_asha(struct media_endpoint *endpoint, + int *err) +{ + return true; +} + static bool endpoint_properties_exists(const char *uuid, struct btd_device *dev, void *user_data) @@ -1454,6 +1462,11 @@ static bool experimental_bcast_sink_ep_supported(struct btd_adapter *adapter) return g_dbus_get_flags() & G_DBUS_FLAG_ENABLE_EXPERIMENTAL; } +static bool experimental_asha_supported(struct btd_adapter *adapter) +{ + return g_dbus_get_flags() & G_DBUS_FLAG_ENABLE_EXPERIMENTAL; +} + static const struct media_endpoint_init { const char *uuid; bool (*func)(struct media_endpoint *endpoint, int *err); @@ -1471,6 +1484,8 @@ static const struct media_endpoint_init { experimental_broadcaster_ep_supported }, { BAA_SERVICE_UUID, endpoint_init_broadcast_sink, experimental_bcast_sink_ep_supported }, + { ASHA_PROFILE_UUID, endpoint_init_asha, + experimental_asha_supported }, }; static struct media_endpoint * @@ -3393,3 +3408,18 @@ bool media_endpoint_is_broadcast(struct media_endpoint *endpoint) return false; } + +const struct media_endpoint *media_endpoint_get_asha(void) +{ + /* + * Because ASHA does not require the application to register an + * endpoint, we need a minimal media_endpoint for transport creation to + * work, so let's create one + */ + static struct media_endpoint asha_endpoint = { + .uuid = ASHA_PROFILE_UUID, + .codec = 0x2, /* Currently on G.722 is defined by the spec */ + }; + + return &asha_endpoint; +} diff --git a/profiles/audio/media.h b/profiles/audio/media.h index 2b579877b..2b2e8e157 100644 --- a/profiles/audio/media.h +++ b/profiles/audio/media.h @@ -24,3 +24,5 @@ struct btd_adapter *media_endpoint_get_btd_adapter( struct media_endpoint *endpoint); bool media_endpoint_is_broadcast(struct media_endpoint *endpoint); int8_t media_player_get_device_volume(struct btd_device *device); + +const struct media_endpoint *media_endpoint_get_asha(void); diff --git a/profiles/audio/transport.c b/profiles/audio/transport.c index 159fbd575..7b8892203 100644 --- a/profiles/audio/transport.c +++ b/profiles/audio/transport.c @@ -32,6 +32,7 @@ #include "src/log.h" #include "src/error.h" +#include "src/shared/asha.h" #include "src/shared/util.h" #include "src/shared/queue.h" #include "src/shared/bap.h" @@ -90,6 +91,10 @@ struct bap_transport { guint resume_id; }; +struct asha_transport { + uint16_t delay; +}; + struct media_transport_ops { const char *uuid; const GDBusPropertyTable *properties; @@ -115,7 +120,7 @@ struct media_transport { char *path; /* Transport object path */ struct btd_device *device; /* Transport device */ struct btd_adapter *adapter; /* Transport adapter bcast*/ - const char *remote_endpoint; /* Transport remote SEP */ + char *remote_endpoint; /* Transport remote SEP */ struct media_endpoint *endpoint; /* Transport endpoint */ struct media_owner *owner; /* Transport owner */ uint8_t *configuration; /* Transport configuration */ @@ -219,6 +224,9 @@ void media_transport_destroy(struct media_transport *transport) g_dbus_unregister_interface(btd_get_dbus_connection(), path, MEDIA_TRANSPORT_INTERFACE); + if (transport->remote_endpoint) + g_free(transport->remote_endpoint); + g_free(path); } @@ -1199,6 +1207,32 @@ static const GDBusPropertyTable transport_bap_bc_properties[] = { { } }; +static gboolean get_asha_delay(const GDBusPropertyTable *property, + DBusMessageIter *iter, void *data) +{ + struct media_transport *transport = data; + struct bt_asha_device *asha = transport->data; + uint16_t delay; + + // Delay property is in 1/10ths of ms, while ASHA RenderDelay is in ms + delay = bt_asha_device_get_render_delay(asha) * 10; + + dbus_message_iter_append_basic(iter, DBUS_TYPE_UINT16, &delay); + + return TRUE; +} + +static const GDBusPropertyTable transport_asha_properties[] = { + { "Device", "o", get_device }, + { "Endpoint", "o", get_endpoint, NULL, endpoint_exists }, + { "UUID", "s", get_uuid }, + { "Codec", "y", get_codec }, + { "State", "s", get_state }, + { "Delay", "q", get_asha_delay }, + { "Volume", "q", get_volume, set_volume, volume_exists }, + { } +}; + static void transport_a2dp_destroy(void *data) { struct a2dp_transport *a2dp = data; @@ -1713,6 +1747,132 @@ static void *transport_bap_init(struct media_transport *transport, void *stream) return bap; } +static void asha_transport_sync_state(struct media_transport *transport, + struct bt_asha_device *asha) +{ + switch (bt_asha_device_get_state(asha)) { + case ASHA_STOPPED: + transport_set_state(transport, TRANSPORT_STATE_IDLE); + break; + case ASHA_STARTING: + transport_set_state(transport, TRANSPORT_STATE_REQUESTING); + break; + case ASHA_STARTED: + transport_set_state(transport, TRANSPORT_STATE_ACTIVE); + break; + case ASHA_STOPPING: + transport_set_state(transport, TRANSPORT_STATE_SUSPENDING); + break; + } +} + +static void asha_transport_state_cb(int status, void *user_data) +{ + struct media_owner *owner = user_data; + struct media_transport *transport = owner->transport; + struct bt_asha_device *asha = transport->data; + enum bt_asha_state_t state; + + state = bt_asha_device_get_state(asha); + + if (state == ASHA_STARTED) { + int fd; + uint16_t imtu, omtu; + gboolean ret; + + fd = bt_asha_device_get_fd(asha); + imtu = omtu = bt_asha_device_get_mtu(asha); + + media_transport_set_fd(transport, fd, imtu, omtu); + + owner->pending->id = 0; + ret = g_dbus_send_reply(btd_get_dbus_connection(), + owner->pending->msg, + DBUS_TYPE_UNIX_FD, &fd, + DBUS_TYPE_UINT16, &imtu, + DBUS_TYPE_UINT16, &omtu, + DBUS_TYPE_INVALID); + if (!ret) { + media_transport_remove_owner(transport); + return; + } + + media_owner_remove(owner); + } else if (state == ASHA_STOPPED) { + if (owner->pending) { + owner->pending->id = 0; + media_request_reply(owner->pending, 0); + media_owner_remove(owner); + } + + media_transport_remove_owner(transport); + } + + asha_transport_sync_state(transport, asha); +} + +static guint transport_asha_resume(struct media_transport *transport, + struct media_owner *owner) +{ + struct bt_asha_device *asha = transport->data; + guint ret; + + ret = bt_asha_device_start(asha, asha_transport_state_cb, owner); + asha_transport_sync_state(transport, asha); + + return ret; +} + +static guint transport_asha_suspend(struct media_transport *transport, + struct media_owner *owner) +{ + struct bt_asha_device *asha = transport->data; + guint ret = 0; + + if (owner) { + ret = bt_asha_device_stop(asha, asha_transport_state_cb, owner); + asha_transport_sync_state(transport, asha); + } else { + ret = bt_asha_device_stop(asha, NULL, NULL); + /* We won't have a callback to set the final state */ + transport_set_state(transport, TRANSPORT_STATE_IDLE); + } + + return ret; +} + +static int8_t transport_asha_get_volume(struct media_transport *transport) +{ + struct bt_asha_device *asha = transport->data; + int8_t volume; + int scaled_volume; + + volume = bt_asha_device_get_volume(asha); + + /* Convert -128-0 to 0-127 */ + scaled_volume = ((((int) volume) + 128) * 127) / 128; + + return scaled_volume; +} + +static int transport_asha_set_volume(struct media_transport *transport, + int8_t volume) +{ + struct bt_asha_device *asha = transport->data; + int scaled_volume; + + /* Convert 0-127 to -128-0 */ + scaled_volume = ((((int) volume) * 128) / 127) - 128; + + return bt_asha_device_set_volume(asha, scaled_volume) ? 0 : -EIO; +} + +static void *transport_asha_init(struct media_transport *transport, void *data) +{ + /* We just store the struct asha_device on the transport */ + return data; +} + #define TRANSPORT_OPS(_uuid, _props, _set_owner, _remove_owner, _init, \ _resume, _suspend, _cancel, _set_state, _get_stream, \ _get_volume, _set_volume, _destroy) \ @@ -1754,6 +1914,14 @@ static void *transport_bap_init(struct media_transport *transport, void *stream) #define BAP_BC_OPS(_uuid) \ BAP_OPS(_uuid, transport_bap_bc_properties, NULL, NULL) +#define ASHA_OPS(_uuid) \ + TRANSPORT_OPS(_uuid, transport_asha_properties, NULL, NULL, \ + transport_asha_init, \ + transport_asha_resume, transport_asha_suspend, \ + NULL, NULL, NULL, \ + transport_asha_get_volume, transport_asha_set_volume, \ + NULL) + static const struct media_transport_ops transport_ops[] = { A2DP_OPS(A2DP_SOURCE_UUID, transport_a2dp_src_init, transport_a2dp_src_set_volume, @@ -1765,6 +1933,7 @@ static const struct media_transport_ops transport_ops[] = { BAP_UC_OPS(PAC_SINK_UUID), BAP_BC_OPS(BCAA_SERVICE_UUID), BAP_BC_OPS(BAA_SERVICE_UUID), + ASHA_OPS(ASHA_PROFILE_UUID), }; static const struct media_transport_ops * @@ -1802,7 +1971,7 @@ struct media_transport *media_transport_create(struct btd_device *device, transport->endpoint = endpoint; transport->configuration = util_memdup(configuration, size); transport->size = size; - transport->remote_endpoint = remote_endpoint; + transport->remote_endpoint = g_strdup(remote_endpoint); if (device) transport->path = g_strdup_printf("%s/fd%d", diff --git a/src/shared/asha.c b/src/shared/asha.c new file mode 100644 index 000000000..58987a7f2 --- /dev/null +++ b/src/shared/asha.c @@ -0,0 +1,505 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2024 Asymptotic Inc. + * + * Author: Arun Raghavan <arun@xxxxxxxxxxxxx> + * + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#define _GNU_SOURCE +#include <errno.h> + +#include <stdbool.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/socket.h> + +#include "lib/bluetooth.h" +#include "lib/l2cap.h" +#include "lib/uuid.h" + +#include "src/adapter.h" +#include "src/device.h" +#include "src/shared/util.h" +#include "src/shared/att.h" +#include "src/shared/gatt-client.h" +#include "src/shared/gatt-db.h" +#include "src/log.h" + +#include "asha.h" + +/* We use strings instead of uint128_t to maintain readability */ +#define ASHA_CHRC_READ_ONLY_PROPERTIES_UUID "6333651e-c481-4a3e-9169-7c902aad37bb" +#define ASHA_CHRC_AUDIO_CONTROL_POINT_UUID "f0d4de7e-4a88-476c-9d9f-1937b0996cc0" +#define ASHA_CHRC_AUDIO_STATUS_UUID "38663f1a-e711-4cac-b641-326b56404837" +#define ASHA_CHRC_VOLUME_UUID "00e4ca9e-ab14-41e4-8823-f9e70c7e91df" +#define ASHA_CHRC_LE_PSM_OUT_UUID "2d410339-82b6-42aa-b34e-e2e01df8cc1a" + +/* 2 byte SDU length, 1 byte sequence number, and then 20ms of G.722 */ +#define ASHA_MTU 163 + +struct bt_asha_device *bt_asha_device_new(void) +{ + struct bt_asha_device *asha; + + asha = new0(struct bt_asha_device, 1); + + return asha; +} + +void bt_asha_device_reset(struct bt_asha_device *asha) +{ + if (asha->status_notify_id) { + bt_gatt_client_unregister_notify(asha->client, + asha->status_notify_id); + } + + if (asha->volume_notify_id) { + bt_gatt_client_unregister_notify(asha->client, + asha->volume_notify_id); + } + + gatt_db_unref(asha->db); + asha->db = NULL; + + bt_gatt_client_unref(asha->client); + asha->client = NULL; + + asha->psm = 0; +} + +void bt_asha_state_reset(struct bt_asha_device *asha) +{ + close(asha->fd); + asha->fd = -1; + + asha->state = ASHA_STOPPED; + asha->resume_id = 0; + + asha->cb = NULL; + asha->cb_user_data = NULL; +} + +void bt_asha_device_free(struct bt_asha_device *asha) +{ + gatt_db_unref(asha->db); + bt_gatt_client_unref(asha->client); + free(asha); +} + +uint16_t bt_asha_device_get_render_delay(struct bt_asha_device *asha) +{ + return asha->render_delay; +} + +enum bt_asha_state_t bt_asha_device_get_state(struct bt_asha_device *asha) +{ + return asha->state; +} + +int bt_asha_device_get_fd(struct bt_asha_device *asha) +{ + return asha->fd; +} + +uint16_t bt_asha_device_get_mtu(struct bt_asha_device *asha) +{ + return ASHA_MTU; +} + +static int asha_connect_socket(struct bt_asha_device *asha) +{ + int fd = 0, err; + struct sockaddr_l2 addr = { 0, }; + struct l2cap_options opts; + + fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); + if (fd < 0) { + error("Could not open L2CAP CoC socket: %s", strerror(errno)); + goto error; + } + + addr.l2_family = AF_BLUETOOTH; + addr.l2_bdaddr_type = BDADDR_LE_PUBLIC; + + /* + * We need to bind before connect to work around getting the wrong addr + * type on older(?) kernels + */ + err = bind(fd, (struct sockaddr *) &addr, sizeof(addr)); + if (err < 0) { + error("Could not bind L2CAP CoC socket: %s", strerror(errno)); + goto error; + } + + addr.l2_psm = asha->psm; + bacpy(&addr.l2_bdaddr, device_get_address(asha->device)); + + opts.mode = BT_MODE_LE_FLOWCTL; + opts.omtu = opts.imtu = ASHA_MTU; + + err = setsockopt(fd, SOL_BLUETOOTH, BT_MODE, &opts.mode, + sizeof(opts.mode)); + if (err < 0) { + error("Could not set L2CAP CoC socket flow control mode: %s", + strerror(errno)); + /* Let this be non-fatal? */ + } + + err = setsockopt(fd, SOL_BLUETOOTH, BT_RCVMTU, &opts.imtu, + sizeof(opts.imtu)); + if (err < 0) { + error("Could not set L2CAP CoC socket receive MTU: %s", + strerror(errno)); + /* Let this be non-fatal? */ + } + + err = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); + if (err < 0) { + error("Could not connect L2CAP CoC socket: %s", + strerror(errno)); + goto error; + } + + DBG("L2CAP CoC socket is open"); + return fd; + +error: + if (fd) + close(fd); + return -1; +} + +static void asha_acp_sent(bool success, uint8_t err, void *user_data) +{ + struct bt_asha_device *asha = user_data; + + if (success) { + DBG("AudioControlPoint command successfully sent"); + } else { + error("Failed to send AudioControlPoint command: %d", err); + + if (asha->cb) + asha->cb(-1, asha->cb_user_data); + + bt_asha_state_reset(asha); + } +} + +static int asha_send_acp(struct bt_asha_device *asha, uint8_t *cmd, + unsigned int len, bt_asha_cb_t cb, void *user_data) +{ + if (!bt_gatt_client_write_value(asha->client, asha->acp_handle, cmd, + len, asha_acp_sent, asha, NULL)) { + error("Error writing ACP start"); + return -1; + } + + asha->cb = cb; + asha->cb_user_data = user_data; + + return 0; +} + +unsigned int bt_asha_device_start(struct bt_asha_device *asha, bt_asha_cb_t cb, + void *user_data) +{ + uint8_t acp_start_cmd[] = { + 0x01, /* START */ + 0x01, /* G.722, 16 kHz */ + 0, /* Unknown media type */ + asha->volume, /* Volume */ + 0, /* Other disconnected */ + }; + int ret; + + if (asha->state != ASHA_STOPPED) { + error("ASHA device start failed. Bad state %d", asha->state); + return 0; + } + + ret = asha_connect_socket(asha); + if (ret < 0) + return 0; + + asha->fd = ret; + + ret = asha_send_acp(asha, acp_start_cmd, sizeof(acp_start_cmd), cb, + user_data); + if (ret < 0) + return 0; + + asha->state = ASHA_STARTING; + + return (++asha->resume_id); +} + +unsigned int bt_asha_device_stop(struct bt_asha_device *asha, bt_asha_cb_t cb, + void *user_data) +{ + uint8_t acp_stop_cmd[] = { + 0x02, /* STOP */ + }; + int ret; + + if (asha->state != ASHA_STARTED) + return 0; + + asha->state = ASHA_STOPPING; + + ret = asha_send_acp(asha, acp_stop_cmd, sizeof(acp_stop_cmd), cb, + user_data); + if (ret < 0) + return 0; + + return asha->resume_id; +} + +int8_t bt_asha_device_get_volume(struct bt_asha_device *asha) +{ + return asha->volume; +} + +bool bt_asha_device_set_volume(struct bt_asha_device *asha, int8_t volume) +{ + if (!bt_gatt_client_write_value(asha->client, asha->volume_handle, + (const uint8_t *)&volume, 1, NULL, NULL, + NULL)) { + error("Error writing ACP start"); + return false; + } + + asha->volume = volume; + return true; +} + +static bool uuid_cmp(const char *uuid1, const bt_uuid_t *uuid2) +{ + bt_uuid_t lhs; + + bt_string_to_uuid(&lhs, uuid1); + + return bt_uuid_cmp(&lhs, uuid2) == 0; +} + +static void read_psm(bool success, + uint8_t att_ecode, + const uint8_t *value, + uint16_t length, + void *user_data) +{ + struct bt_asha_device *asha = user_data; + + if (!success) { + DBG("Reading PSM failed with ATT error: %u", att_ecode); + return; + } + + if (length != 2) { + DBG("Reading PSM failed: unexpected length %u", length); + return; + } + + asha->psm = get_le16(value); + + DBG("Got PSM: %u", asha->psm); +} + +static void read_rops(bool success, + uint8_t att_ecode, + const uint8_t *value, + uint16_t length, + void *user_data) +{ + struct bt_asha_device *asha = user_data; + + if (!success) { + DBG("Reading ROPs failed with ATT error: %u", att_ecode); + return; + } + + if (length != 17) { + DBG("Reading ROPs failed: unexpected length %u", length); + return; + } + + if (value[0] != 0x01) { + DBG("Unexpected ASHA version: %u", value[0]); + return; + } + + /* Device Capabilities */ + asha->right_side = (value[1] & 0x1) != 0; + asha->binaural = (value[1] & 0x2) != 0; + asha->csis_supported = (value[1] & 0x4) != 0; + /* HiSyncId: 2 byte company id, 6 byte ID shared by left and right */ + memcpy(asha->hisyncid, &value[2], 8); + /* FeatureMap */ + asha->coc_streaming_supported = (value[10] & 0x1) != 0; + /* RenderDelay */ + asha->render_delay = get_le16(&value[11]); + /* byte 13 & 14 are reserved */ + /* Codec IDs */ + asha->codec_ids = get_le16(&value[15]); + + DBG("Got ROPS: side %u, binaural %u, csis: %u, delay %u, codecs: %u", + asha->right_side, asha->binaural, asha->csis_supported, + asha->render_delay, asha->codec_ids); +} + +static void audio_status_notify(uint16_t value_handle, const uint8_t *value, + uint16_t length, void *user_data) +{ + struct bt_asha_device *asha = user_data; + uint8_t status = *value; + /* Back these up to survive the reset paths */ + bt_asha_cb_t cb = asha->cb; + bt_asha_cb_t cb_user_data = asha->cb_user_data; + + if (asha->state == ASHA_STARTING) { + if (status == 0) { + asha->state = ASHA_STARTED; + DBG("ASHA start complete"); + } else { + bt_asha_state_reset(asha); + DBG("ASHA start failed"); + } + } else if (asha->state == ASHA_STOPPING) { + /* We reset our state, regardless */ + bt_asha_state_reset(asha); + DBG("ASHA stop %s", status == 0 ? "complete" : "failed"); + } + + if (cb) { + cb(status, cb_user_data); + asha->cb = NULL; + asha->cb_user_data = NULL; + } +} + +static void read_volume(bool success, + uint8_t att_ecode, + const uint8_t *value, + uint16_t length, + void *user_data) +{ + struct bt_asha_device *asha = user_data; + + if (!success) { + DBG("Reading volume failed with ATT error: %u", att_ecode); + return; + } + + if (length != 2) { + DBG("Reading volume failed: unexpected length %u", length); + return; + } + + asha->volume = get_s8(value); + + DBG("Got volume: %d", asha->volume); +} + +static void volume_notify(uint16_t value_handle, const uint8_t *value, + uint16_t length, void *user_data) +{ + struct bt_asha_device *asha = user_data; + + asha->volume = get_s8(value); + + DBG("Volume changed: %d", asha->volume); +} + +static void handle_characteristic(struct gatt_db_attribute *attr, + void *user_data) +{ + struct bt_asha_device *asha = user_data; + uint16_t value_handle; + bt_uuid_t uuid; + + if (!gatt_db_attribute_get_char_data(attr, NULL, &value_handle, NULL, + NULL, &uuid)) { + error("Failed to obtain characteristic data"); + return; + } + + if (uuid_cmp(ASHA_CHRC_LE_PSM_OUT_UUID, &uuid)) { + if (!bt_gatt_client_read_value(asha->client, value_handle, + read_psm, asha, NULL)) + DBG("Failed to send request to read battery level"); + } else if (uuid_cmp(ASHA_CHRC_READ_ONLY_PROPERTIES_UUID, &uuid)) { + if (!bt_gatt_client_read_value(asha->client, value_handle, + read_rops, asha, NULL)) + DBG("Failed to send request for readonly properties"); + } else if (uuid_cmp(ASHA_CHRC_AUDIO_CONTROL_POINT_UUID, &uuid)) { + /* Store this for later writes */ + asha->acp_handle = value_handle; + } else if (uuid_cmp(ASHA_CHRC_VOLUME_UUID, &uuid)) { + /* Store this for later reads and writes */ + asha->volume_handle = value_handle; + asha->volume_notify_id = + bt_gatt_client_register_notify(asha->client, + value_handle, NULL, volume_notify, asha, + NULL); + if (!asha->status_notify_id) + DBG("Failed to send request to notify volume"); + if (!bt_gatt_client_read_value(asha->client, value_handle, + read_volume, asha, NULL)) + DBG("Failed to send request to volume"); + } else if (uuid_cmp(ASHA_CHRC_AUDIO_STATUS_UUID, &uuid)) { + asha->status_notify_id = + bt_gatt_client_register_notify(asha->client, + value_handle, NULL, audio_status_notify, asha, + NULL); + if (!asha->status_notify_id) + DBG("Failed to send request to notify AudioStatus"); + } else { + char uuid_str[MAX_LEN_UUID_STR]; + + bt_uuid_to_string(&uuid, uuid_str, sizeof(uuid_str)); + DBG("Unsupported characteristic: %s", uuid_str); + } +} + +static void foreach_asha_service(struct gatt_db_attribute *attr, + void *user_data) +{ + struct bt_asha_device *asha = user_data; + + DBG("Found ASHA GATT service"); + + asha->attr = attr; + gatt_db_service_foreach_char(asha->attr, handle_characteristic, asha); +} + +bool bt_asha_device_probe(struct bt_asha_device *asha) +{ + struct btd_device *device = asha->device; + struct gatt_db *db = btd_device_get_gatt_db(device); + struct bt_gatt_client *client = btd_device_get_gatt_client(device); + bt_uuid_t asha_uuid; + + asha->db = gatt_db_ref(db); + asha->client = bt_gatt_client_clone(client); + + bt_uuid16_create(&asha_uuid, ASHA_SERVICE); + gatt_db_foreach_service(db, &asha_uuid, foreach_asha_service, asha); + + if (!asha->attr) { + error("ASHA attribute not found"); + bt_asha_device_reset(asha); + return false; + } + + return true; +} diff --git a/src/shared/asha.h b/src/shared/asha.h new file mode 100644 index 000000000..475e9e16c --- /dev/null +++ b/src/shared/asha.h @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2024 Asymptotic Inc. + * + * Author: Arun Raghavan <arun@xxxxxxxxxxxxx> + * + * + */ + +#include <stdbool.h> +#include <stdint.h> + +struct bt_asha_device; + +enum bt_asha_state_t { + ASHA_STOPPED = 0, + ASHA_STARTING, + ASHA_STARTED, + ASHA_STOPPING, +}; + +typedef void (*bt_asha_cb_t)(int status, void *data); + +struct bt_asha_device { + struct btd_device *device; + struct bt_gatt_client *client; + struct gatt_db *db; + struct gatt_db_attribute *attr; + uint16_t acp_handle; + uint16_t volume_handle; + unsigned int status_notify_id; + unsigned int volume_notify_id; + + uint16_t psm; + bool right_side; + bool binaural; + bool csis_supported; + bool coc_streaming_supported; + uint8_t hisyncid[8]; + uint16_t render_delay; + uint16_t codec_ids; + int8_t volume; + + struct media_transport *transport; + int fd; + enum bt_asha_state_t state; + bt_asha_cb_t cb; + void *cb_user_data; + int resume_id; +}; + +struct bt_asha_device *bt_asha_device_new(void); +void bt_asha_device_reset(struct bt_asha_device *asha); +void bt_asha_state_reset(struct bt_asha_device *asha); +void bt_asha_device_free(struct bt_asha_device *asha); + +uint16_t bt_asha_device_get_render_delay(struct bt_asha_device *asha); +enum bt_asha_state_t bt_asha_device_get_state(struct bt_asha_device *asha); +int bt_asha_device_get_fd(struct bt_asha_device *asha); +uint16_t bt_asha_device_get_mtu(struct bt_asha_device *asha); + +unsigned int bt_asha_device_start(struct bt_asha_device *asha, bt_asha_cb_t cb, + void *user_data); +unsigned int bt_asha_device_stop(struct bt_asha_device *asha, bt_asha_cb_t cb, + void *user_data); + +int8_t bt_asha_device_get_volume(struct bt_asha_device *asha); +bool bt_asha_device_set_volume(struct bt_asha_device *asha, int8_t volume); + +bool bt_asha_device_probe(struct bt_asha_device *asha); -- 2.45.0
