1 /*
2 * Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/bluetooth/hci.h>
8
9 #include <zephyr/init.h>
10 #include <zephyr/sys/byteorder.h>
11
12 #include <zephyr/drivers/bluetooth/hci_driver.h>
13
14 #include <esp_bt.h>
15
16 #define LOG_LEVEL CONFIG_BT_HCI_DRIVER_LOG_LEVEL
17 #include <zephyr/logging/log.h>
18 LOG_MODULE_REGISTER(bt_hci_driver_esp32);
19
20 #define HCI_CMD 0x01
21 #define HCI_ACL 0x02
22 #define HCI_SCO 0x03
23 #define HCI_EVT 0x04
24 #define HCI_ISO 0x05
25
26 #define HCI_BT_ESP32_TIMEOUT K_MSEC(2000)
27
28 static K_SEM_DEFINE(hci_send_sem, 1, 1);
29
is_hci_event_discardable(const uint8_t * evt_data)30 static bool is_hci_event_discardable(const uint8_t *evt_data)
31 {
32 uint8_t evt_type = evt_data[0];
33
34 switch (evt_type) {
35 #if defined(CONFIG_BT_BREDR)
36 case BT_HCI_EVT_INQUIRY_RESULT_WITH_RSSI:
37 case BT_HCI_EVT_EXTENDED_INQUIRY_RESULT:
38 return true;
39 #endif
40 case BT_HCI_EVT_LE_META_EVENT: {
41 uint8_t subevt_type = evt_data[sizeof(struct bt_hci_evt_hdr)];
42
43 switch (subevt_type) {
44 case BT_HCI_EVT_LE_ADVERTISING_REPORT:
45 return true;
46 default:
47 return false;
48 }
49 }
50 default:
51 return false;
52 }
53 }
54
bt_esp_evt_recv(uint8_t * data,size_t remaining)55 static struct net_buf *bt_esp_evt_recv(uint8_t *data, size_t remaining)
56 {
57 bool discardable = false;
58 struct bt_hci_evt_hdr hdr;
59 struct net_buf *buf;
60 size_t buf_tailroom;
61
62 if (remaining < sizeof(hdr)) {
63 LOG_ERR("Not enough data for event header");
64 return NULL;
65 }
66
67 discardable = is_hci_event_discardable(data);
68
69 memcpy((void *)&hdr, data, sizeof(hdr));
70 data += sizeof(hdr);
71 remaining -= sizeof(hdr);
72
73 if (remaining != hdr.len) {
74 LOG_ERR("Event payload length is not correct");
75 return NULL;
76 }
77 LOG_DBG("len %u", hdr.len);
78
79 buf = bt_buf_get_evt(hdr.evt, discardable, K_NO_WAIT);
80 if (!buf) {
81 if (discardable) {
82 LOG_DBG("Discardable buffer pool full, ignoring event");
83 } else {
84 LOG_ERR("No available event buffers!");
85 }
86 return buf;
87 }
88
89 net_buf_add_mem(buf, &hdr, sizeof(hdr));
90
91 buf_tailroom = net_buf_tailroom(buf);
92 if (buf_tailroom < remaining) {
93 LOG_ERR("Not enough space in buffer %zu/%zu", remaining, buf_tailroom);
94 net_buf_unref(buf);
95 return NULL;
96 }
97
98 net_buf_add_mem(buf, data, remaining);
99
100 return buf;
101 }
102
bt_esp_acl_recv(uint8_t * data,size_t remaining)103 static struct net_buf *bt_esp_acl_recv(uint8_t *data, size_t remaining)
104 {
105 struct bt_hci_acl_hdr hdr;
106 struct net_buf *buf;
107 size_t buf_tailroom;
108
109 if (remaining < sizeof(hdr)) {
110 LOG_ERR("Not enough data for ACL header");
111 return NULL;
112 }
113
114 buf = bt_buf_get_rx(BT_BUF_ACL_IN, K_NO_WAIT);
115 if (buf) {
116 memcpy((void *)&hdr, data, sizeof(hdr));
117 data += sizeof(hdr);
118 remaining -= sizeof(hdr);
119
120 net_buf_add_mem(buf, &hdr, sizeof(hdr));
121 } else {
122 LOG_ERR("No available ACL buffers!");
123 return NULL;
124 }
125
126 if (remaining != sys_le16_to_cpu(hdr.len)) {
127 LOG_ERR("ACL payload length is not correct");
128 net_buf_unref(buf);
129 return NULL;
130 }
131
132 buf_tailroom = net_buf_tailroom(buf);
133 if (buf_tailroom < remaining) {
134 LOG_ERR("Not enough space in buffer %zu/%zu", remaining, buf_tailroom);
135 net_buf_unref(buf);
136 return NULL;
137 }
138
139 LOG_DBG("len %u", remaining);
140 net_buf_add_mem(buf, data, remaining);
141
142 return buf;
143 }
144
bt_esp_iso_recv(uint8_t * data,size_t remaining)145 static struct net_buf *bt_esp_iso_recv(uint8_t *data, size_t remaining)
146 {
147 struct bt_hci_iso_hdr hdr;
148 struct net_buf *buf;
149 size_t buf_tailroom;
150
151 if (remaining < sizeof(hdr)) {
152 LOG_ERR("Not enough data for ISO header");
153 return NULL;
154 }
155
156 buf = bt_buf_get_rx(BT_BUF_ISO_IN, K_NO_WAIT);
157 if (buf) {
158 memcpy((void *)&hdr, data, sizeof(hdr));
159 data += sizeof(hdr);
160 remaining -= sizeof(hdr);
161
162 net_buf_add_mem(buf, &hdr, sizeof(hdr));
163 } else {
164 LOG_ERR("No available ISO buffers!");
165 return NULL;
166 }
167
168 if (remaining != bt_iso_hdr_len(sys_le16_to_cpu(hdr.len))) {
169 LOG_ERR("ISO payload length is not correct");
170 net_buf_unref(buf);
171 return NULL;
172 }
173
174 buf_tailroom = net_buf_tailroom(buf);
175 if (buf_tailroom < remaining) {
176 LOG_ERR("Not enough space in buffer %zu/%zu", remaining, buf_tailroom);
177 net_buf_unref(buf);
178 return NULL;
179 }
180
181 LOG_DBG("len %zu", remaining);
182 net_buf_add_mem(buf, data, remaining);
183
184 return buf;
185 }
186
hci_esp_host_rcv_pkt(uint8_t * data,uint16_t len)187 static int hci_esp_host_rcv_pkt(uint8_t *data, uint16_t len)
188 {
189 uint8_t pkt_indicator;
190 struct net_buf *buf = NULL;
191 size_t remaining = len;
192
193 LOG_HEXDUMP_DBG(data, len, "host packet data:");
194
195 pkt_indicator = *data++;
196 remaining -= sizeof(pkt_indicator);
197
198 switch (pkt_indicator) {
199 case HCI_EVT:
200 buf = bt_esp_evt_recv(data, remaining);
201 break;
202
203 case HCI_ACL:
204 buf = bt_esp_acl_recv(data, remaining);
205 break;
206
207 case HCI_SCO:
208 buf = bt_esp_iso_recv(data, remaining);
209 break;
210
211 default:
212 LOG_ERR("Unknown HCI type %u", pkt_indicator);
213 return -1;
214 }
215
216 if (buf) {
217 LOG_DBG("Calling bt_recv(%p)", buf);
218
219 bt_recv(buf);
220 }
221
222 return 0;
223 }
224
hci_esp_controller_rcv_pkt_ready(void)225 static void hci_esp_controller_rcv_pkt_ready(void)
226 {
227 k_sem_give(&hci_send_sem);
228 }
229
230 static esp_vhci_host_callback_t vhci_host_cb = {
231 hci_esp_controller_rcv_pkt_ready,
232 hci_esp_host_rcv_pkt
233 };
234
bt_esp32_send(struct net_buf * buf)235 static int bt_esp32_send(struct net_buf *buf)
236 {
237 int err = 0;
238 uint8_t pkt_indicator;
239
240 LOG_DBG("buf %p type %u len %u", buf, bt_buf_get_type(buf), buf->len);
241
242 switch (bt_buf_get_type(buf)) {
243 case BT_BUF_ACL_OUT:
244 pkt_indicator = HCI_ACL;
245 break;
246 case BT_BUF_CMD:
247 pkt_indicator = HCI_CMD;
248 break;
249 case BT_BUF_ISO_OUT:
250 pkt_indicator = HCI_ISO;
251 break;
252 default:
253 LOG_ERR("Unknown type %u", bt_buf_get_type(buf));
254 goto done;
255 }
256 net_buf_push_u8(buf, pkt_indicator);
257
258 LOG_HEXDUMP_DBG(buf->data, buf->len, "Final HCI buffer:");
259
260 if (!esp_vhci_host_check_send_available()) {
261 LOG_WRN("Controller not ready to receive packets");
262 }
263
264 if (k_sem_take(&hci_send_sem, HCI_BT_ESP32_TIMEOUT) == 0) {
265 esp_vhci_host_send_packet(buf->data, buf->len);
266 } else {
267 LOG_ERR("Send packet timeout error");
268 err = -ETIMEDOUT;
269 }
270
271 done:
272 net_buf_unref(buf);
273 k_sem_give(&hci_send_sem);
274
275 return err;
276 }
277
bt_esp32_ble_init(void)278 static int bt_esp32_ble_init(void)
279 {
280 int ret;
281 esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
282
283 #if defined(CONFIG_BT_BREDR) && defined(CONFIG_SOC_SERIES_ESP32)
284 esp_bt_mode_t mode = ESP_BT_MODE_BTDM;
285 #else
286 esp_bt_mode_t mode = ESP_BT_MODE_BLE;
287 #endif
288
289 ret = esp_bt_controller_init(&bt_cfg);
290 if (ret) {
291 LOG_ERR("Bluetooth controller init failed %d", ret);
292 return ret;
293 }
294
295 ret = esp_bt_controller_enable(mode);
296 if (ret) {
297 LOG_ERR("Bluetooth controller enable failed: %d", ret);
298 return ret;
299 }
300
301 esp_vhci_host_register_callback(&vhci_host_cb);
302
303 return 0;
304 }
305
bt_esp32_ble_deinit(void)306 static int bt_esp32_ble_deinit(void)
307 {
308 int ret;
309
310 ret = esp_bt_controller_disable();
311 if (ret) {
312 LOG_ERR("Bluetooth controller disable failed %d", ret);
313 return ret;
314 }
315
316 ret = esp_bt_controller_deinit();
317 if (ret) {
318 LOG_ERR("Bluetooth controller deinit failed %d", ret);
319 return ret;
320 }
321
322 return 0;
323 }
324
bt_esp32_open(void)325 static int bt_esp32_open(void)
326 {
327 int err;
328
329 err = bt_esp32_ble_init();
330 if (err) {
331 return err;
332 }
333
334 LOG_DBG("ESP32 BT started");
335
336 return 0;
337 }
338
bt_esp32_close(void)339 static int bt_esp32_close(void)
340 {
341 int err;
342
343 err = bt_esp32_ble_deinit();
344 if (err) {
345 return err;
346 }
347
348 LOG_DBG("ESP32 BT stopped");
349
350 return 0;
351 }
352
353 static const struct bt_hci_driver drv = {
354 .name = "BT ESP32",
355 .open = bt_esp32_open,
356 .send = bt_esp32_send,
357 .close = bt_esp32_close,
358 .bus = BT_HCI_DRIVER_BUS_IPM,
359 #if defined(CONFIG_BT_DRIVER_QUIRK_NO_AUTO_DLE)
360 .quirks = BT_QUIRK_NO_AUTO_DLE,
361 #endif
362 };
363
bt_esp32_init(void)364 static int bt_esp32_init(void)
365 {
366 bt_hci_driver_register(&drv);
367
368 return 0;
369 }
370
371 SYS_INIT(bt_esp32_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
372
