blob: 8dae220dd944d944849ead2bcdc5ce267c23083a [file] [log] [blame]
/*
* Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/bluetooth/hci.h>
#include <zephyr/init.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/drivers/bluetooth/hci_driver.h>
#include <esp_bt.h>
#define LOG_LEVEL CONFIG_BT_HCI_DRIVER_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(bt_hci_driver_esp32);
#define HCI_CMD 0x01
#define HCI_ACL 0x02
#define HCI_SCO 0x03
#define HCI_EVT 0x04
#define HCI_ISO 0x05
#define HCI_BT_ESP32_TIMEOUT K_MSEC(2000)
static K_SEM_DEFINE(hci_send_sem, 1, 1);
static bool is_hci_event_discardable(const uint8_t *evt_data)
{
uint8_t evt_type = evt_data[0];
switch (evt_type) {
#if defined(CONFIG_BT_BREDR)
case BT_HCI_EVT_INQUIRY_RESULT_WITH_RSSI:
case BT_HCI_EVT_EXTENDED_INQUIRY_RESULT:
return true;
#endif
case BT_HCI_EVT_LE_META_EVENT: {
uint8_t subevt_type = evt_data[sizeof(struct bt_hci_evt_hdr)];
switch (subevt_type) {
case BT_HCI_EVT_LE_ADVERTISING_REPORT:
return true;
default:
return false;
}
}
default:
return false;
}
}
static struct net_buf *bt_esp_evt_recv(uint8_t *data, size_t remaining)
{
bool discardable = false;
struct bt_hci_evt_hdr hdr;
struct net_buf *buf;
size_t buf_tailroom;
if (remaining < sizeof(hdr)) {
LOG_ERR("Not enough data for event header");
return NULL;
}
discardable = is_hci_event_discardable(data);
memcpy((void *)&hdr, data, sizeof(hdr));
data += sizeof(hdr);
remaining -= sizeof(hdr);
if (remaining != hdr.len) {
LOG_ERR("Event payload length is not correct");
return NULL;
}
LOG_DBG("len %u", hdr.len);
buf = bt_buf_get_evt(hdr.evt, discardable, K_NO_WAIT);
if (!buf) {
if (discardable) {
LOG_DBG("Discardable buffer pool full, ignoring event");
} else {
LOG_ERR("No available event buffers!");
}
return buf;
}
net_buf_add_mem(buf, &hdr, sizeof(hdr));
buf_tailroom = net_buf_tailroom(buf);
if (buf_tailroom < remaining) {
LOG_ERR("Not enough space in buffer %zu/%zu", remaining, buf_tailroom);
net_buf_unref(buf);
return NULL;
}
net_buf_add_mem(buf, data, remaining);
return buf;
}
static struct net_buf *bt_esp_acl_recv(uint8_t *data, size_t remaining)
{
struct bt_hci_acl_hdr hdr;
struct net_buf *buf;
size_t buf_tailroom;
if (remaining < sizeof(hdr)) {
LOG_ERR("Not enough data for ACL header");
return NULL;
}
buf = bt_buf_get_rx(BT_BUF_ACL_IN, K_NO_WAIT);
if (buf) {
memcpy((void *)&hdr, data, sizeof(hdr));
data += sizeof(hdr);
remaining -= sizeof(hdr);
net_buf_add_mem(buf, &hdr, sizeof(hdr));
} else {
LOG_ERR("No available ACL buffers!");
return NULL;
}
if (remaining != sys_le16_to_cpu(hdr.len)) {
LOG_ERR("ACL payload length is not correct");
net_buf_unref(buf);
return NULL;
}
buf_tailroom = net_buf_tailroom(buf);
if (buf_tailroom < remaining) {
LOG_ERR("Not enough space in buffer %zu/%zu", remaining, buf_tailroom);
net_buf_unref(buf);
return NULL;
}
LOG_DBG("len %u", remaining);
net_buf_add_mem(buf, data, remaining);
return buf;
}
static struct net_buf *bt_esp_iso_recv(uint8_t *data, size_t remaining)
{
struct bt_hci_iso_hdr hdr;
struct net_buf *buf;
size_t buf_tailroom;
if (remaining < sizeof(hdr)) {
LOG_ERR("Not enough data for ISO header");
return NULL;
}
buf = bt_buf_get_rx(BT_BUF_ISO_IN, K_NO_WAIT);
if (buf) {
memcpy((void *)&hdr, data, sizeof(hdr));
data += sizeof(hdr);
remaining -= sizeof(hdr);
net_buf_add_mem(buf, &hdr, sizeof(hdr));
} else {
LOG_ERR("No available ISO buffers!");
return NULL;
}
if (remaining != bt_iso_hdr_len(sys_le16_to_cpu(hdr.len))) {
LOG_ERR("ISO payload length is not correct");
net_buf_unref(buf);
return NULL;
}
buf_tailroom = net_buf_tailroom(buf);
if (buf_tailroom < remaining) {
LOG_ERR("Not enough space in buffer %zu/%zu", remaining, buf_tailroom);
net_buf_unref(buf);
return NULL;
}
LOG_DBG("len %zu", remaining);
net_buf_add_mem(buf, data, remaining);
return buf;
}
static int hci_esp_host_rcv_pkt(uint8_t *data, uint16_t len)
{
uint8_t pkt_indicator;
struct net_buf *buf = NULL;
size_t remaining = len;
LOG_HEXDUMP_DBG(data, len, "host packet data:");
pkt_indicator = *data++;
remaining -= sizeof(pkt_indicator);
switch (pkt_indicator) {
case HCI_EVT:
buf = bt_esp_evt_recv(data, remaining);
break;
case HCI_ACL:
buf = bt_esp_acl_recv(data, remaining);
break;
case HCI_SCO:
buf = bt_esp_iso_recv(data, remaining);
break;
default:
LOG_ERR("Unknown HCI type %u", pkt_indicator);
return -1;
}
if (buf) {
LOG_DBG("Calling bt_recv(%p)", buf);
bt_recv(buf);
}
return 0;
}
static void hci_esp_controller_rcv_pkt_ready(void)
{
k_sem_give(&hci_send_sem);
}
static esp_vhci_host_callback_t vhci_host_cb = {
hci_esp_controller_rcv_pkt_ready,
hci_esp_host_rcv_pkt
};
static int bt_esp32_send(struct net_buf *buf)
{
int err = 0;
uint8_t pkt_indicator;
LOG_DBG("buf %p type %u len %u", buf, bt_buf_get_type(buf), buf->len);
switch (bt_buf_get_type(buf)) {
case BT_BUF_ACL_OUT:
pkt_indicator = HCI_ACL;
break;
case BT_BUF_CMD:
pkt_indicator = HCI_CMD;
break;
case BT_BUF_ISO_OUT:
pkt_indicator = HCI_ISO;
break;
default:
LOG_ERR("Unknown type %u", bt_buf_get_type(buf));
goto done;
}
net_buf_push_u8(buf, pkt_indicator);
LOG_HEXDUMP_DBG(buf->data, buf->len, "Final HCI buffer:");
if (!esp_vhci_host_check_send_available()) {
LOG_WRN("Controller not ready to receive packets");
}
if (k_sem_take(&hci_send_sem, HCI_BT_ESP32_TIMEOUT) == 0) {
esp_vhci_host_send_packet(buf->data, buf->len);
} else {
LOG_ERR("Send packet timeout error");
err = -ETIMEDOUT;
}
done:
net_buf_unref(buf);
k_sem_give(&hci_send_sem);
return err;
}
static int bt_esp32_ble_init(void)
{
int ret;
esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
#if defined(CONFIG_BT_BREDR) && defined(CONFIG_SOC_SERIES_ESP32)
esp_bt_mode_t mode = ESP_BT_MODE_BTDM;
#else
esp_bt_mode_t mode = ESP_BT_MODE_BLE;
#endif
ret = esp_bt_controller_init(&bt_cfg);
if (ret) {
LOG_ERR("Bluetooth controller init failed %d", ret);
return ret;
}
ret = esp_bt_controller_enable(mode);
if (ret) {
LOG_ERR("Bluetooth controller enable failed: %d", ret);
return ret;
}
esp_vhci_host_register_callback(&vhci_host_cb);
return 0;
}
static int bt_esp32_open(void)
{
int err;
err = bt_esp32_ble_init();
if (err) {
return err;
}
LOG_DBG("ESP32 BT started");
return 0;
}
static const struct bt_hci_driver drv = {
.name = "BT ESP32",
.open = bt_esp32_open,
.send = bt_esp32_send,
.bus = BT_HCI_DRIVER_BUS_IPM,
#if defined(CONFIG_BT_DRIVER_QUIRK_NO_AUTO_DLE)
.quirks = BT_QUIRK_NO_AUTO_DLE,
#endif
};
static int bt_esp32_init(void)
{
bt_hci_driver_register(&drv);
return 0;
}
SYS_INIT(bt_esp32_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);