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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 | /* h4.c - H:4 UART based Bluetooth driver */ /* * Copyright (c) 2015-2016 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ #include <errno.h> #include <stddef.h> #include <zephyr.h> #include <arch/cpu.h> #include <init.h> #include <drivers/uart.h> #include <sys/util.h> #include <sys/byteorder.h> #include <string.h> #include <bluetooth/bluetooth.h> #include <bluetooth/hci.h> #include <bluetooth/hci_driver.h> #define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_DRIVER) #define LOG_MODULE_NAME bt_driver #include "common/log.h" #include "../util.h" #define H4_NONE 0x00 #define H4_CMD 0x01 #define H4_ACL 0x02 #define H4_SCO 0x03 #define H4_EVT 0x04 static K_THREAD_STACK_DEFINE(rx_thread_stack, CONFIG_BT_RX_STACK_SIZE); static struct k_thread rx_thread_data; static struct { struct net_buf *buf; struct k_fifo fifo; u16_t remaining; u16_t discard; bool have_hdr; bool discardable; u8_t hdr_len; u8_t type; union { struct bt_hci_evt_hdr evt; struct bt_hci_acl_hdr acl; u8_t hdr[4]; }; } rx = { .fifo = Z_FIFO_INITIALIZER(rx.fifo), }; static struct { u8_t type; struct net_buf *buf; struct k_fifo fifo; } tx = { .fifo = Z_FIFO_INITIALIZER(tx.fifo), }; static struct device *h4_dev; static inline void h4_get_type(void) { /* Get packet type */ if (uart_fifo_read(h4_dev, &rx.type, 1) != 1) { BT_WARN("Unable to read H:4 packet type"); rx.type = H4_NONE; return; } switch (rx.type) { case H4_EVT: rx.remaining = sizeof(rx.evt); rx.hdr_len = rx.remaining; break; case H4_ACL: rx.remaining = sizeof(rx.acl); rx.hdr_len = rx.remaining; break; default: BT_ERR("Unknown H:4 type 0x%02x", rx.type); rx.type = H4_NONE; } } static inline void get_acl_hdr(void) { struct bt_hci_acl_hdr *hdr = &rx.acl; int to_read = sizeof(*hdr) - rx.remaining; rx.remaining -= uart_fifo_read(h4_dev, (u8_t *)hdr + to_read, rx.remaining); if (!rx.remaining) { rx.remaining = sys_le16_to_cpu(hdr->len); BT_DBG("Got ACL header. Payload %u bytes", rx.remaining); rx.have_hdr = true; } } static inline void get_evt_hdr(void) { struct bt_hci_evt_hdr *hdr = &rx.evt; int to_read = rx.hdr_len - rx.remaining; rx.remaining -= uart_fifo_read(h4_dev, (u8_t *)hdr + to_read, rx.remaining); if (rx.hdr_len == sizeof(*hdr) && rx.remaining < sizeof(*hdr)) { switch (rx.evt.evt) { case BT_HCI_EVT_LE_META_EVENT: rx.remaining++; rx.hdr_len++; break; #if defined(CONFIG_BT_BREDR) case BT_HCI_EVT_INQUIRY_RESULT_WITH_RSSI: case BT_HCI_EVT_EXTENDED_INQUIRY_RESULT: rx.discardable = true; break; #endif } } if (!rx.remaining) { if (rx.evt.evt == BT_HCI_EVT_LE_META_EVENT && rx.hdr[sizeof(*hdr)] == BT_HCI_EVT_LE_ADVERTISING_REPORT) { BT_DBG("Marking adv report as discardable"); rx.discardable = true; } rx.remaining = hdr->len - (rx.hdr_len - sizeof(*hdr)); BT_DBG("Got event header. Payload %u bytes", hdr->len); rx.have_hdr = true; } } static inline void copy_hdr(struct net_buf *buf) { net_buf_add_mem(buf, rx.hdr, rx.hdr_len); } static void reset_rx(void) { rx.type = H4_NONE; rx.remaining = 0U; rx.have_hdr = false; rx.hdr_len = 0U; rx.discardable = false; } static struct net_buf *get_rx(int timeout) { BT_DBG("type 0x%02x, evt 0x%02x", rx.type, rx.evt.evt); if (rx.type == H4_EVT) { return bt_buf_get_evt(rx.evt.evt, rx.discardable, timeout); } return bt_buf_get_rx(BT_BUF_ACL_IN, timeout); } static void rx_thread(void *p1, void *p2, void *p3) { struct net_buf *buf; ARG_UNUSED(p1); ARG_UNUSED(p2); ARG_UNUSED(p3); BT_DBG("started"); while (1) { BT_DBG("rx.buf %p", rx.buf); /* We can only do the allocation if we know the initial * header, since Command Complete/Status events must use the * original command buffer (if available). */ if (rx.have_hdr && !rx.buf) { rx.buf = get_rx(K_FOREVER); BT_DBG("Got rx.buf %p", rx.buf); if (rx.remaining > net_buf_tailroom(rx.buf)) { BT_ERR("Not enough space in buffer"); rx.discard = rx.remaining; reset_rx(); } else { copy_hdr(rx.buf); } } /* Let the ISR continue receiving new packets */ uart_irq_rx_enable(h4_dev); buf = net_buf_get(&rx.fifo, K_FOREVER); do { uart_irq_rx_enable(h4_dev); BT_DBG("Calling bt_recv(%p)", buf); bt_recv(buf); /* Give other threads a chance to run if the ISR * is receiving data so fast that rx.fifo never * or very rarely goes empty. */ k_yield(); uart_irq_rx_disable(h4_dev); buf = net_buf_get(&rx.fifo, K_NO_WAIT); } while (buf); } } static size_t h4_discard(struct device *uart, size_t len) { u8_t buf[33]; return uart_fifo_read(uart, buf, MIN(len, sizeof(buf))); } static inline void read_payload(void) { struct net_buf *buf; bool prio; int read; if (!rx.buf) { rx.buf = get_rx(K_NO_WAIT); if (!rx.buf) { if (rx.discardable) { BT_WARN("Discarding event 0x%02x", rx.evt.evt); rx.discard = rx.remaining; reset_rx(); return; } BT_WARN("Failed to allocate, deferring to rx_thread"); uart_irq_rx_disable(h4_dev); return; } BT_DBG("Allocated rx.buf %p", rx.buf); if (rx.remaining > net_buf_tailroom(rx.buf)) { BT_ERR("Not enough space in buffer"); rx.discard = rx.remaining; reset_rx(); return; } copy_hdr(rx.buf); } read = uart_fifo_read(h4_dev, net_buf_tail(rx.buf), rx.remaining); net_buf_add(rx.buf, read); rx.remaining -= read; BT_DBG("got %d bytes, remaining %u", read, rx.remaining); BT_DBG("Payload (len %u): %s", rx.buf->len, bt_hex(rx.buf->data, rx.buf->len)); if (rx.remaining) { return; } prio = (rx.type == H4_EVT && bt_hci_evt_is_prio(rx.evt.evt)); buf = rx.buf; rx.buf = NULL; if (rx.type == H4_EVT) { bt_buf_set_type(buf, BT_BUF_EVT); } else { bt_buf_set_type(buf, BT_BUF_ACL_IN); } reset_rx(); if (prio) { BT_DBG("Calling bt_recv_prio(%p)", buf); bt_recv_prio(buf); } else { BT_DBG("Putting buf %p to rx fifo", buf); net_buf_put(&rx.fifo, buf); } } static inline void read_header(void) { switch (rx.type) { case H4_NONE: h4_get_type(); return; case H4_EVT: get_evt_hdr(); break; case H4_ACL: get_acl_hdr(); break; default: CODE_UNREACHABLE; return; } if (rx.have_hdr && rx.buf) { if (rx.remaining > net_buf_tailroom(rx.buf)) { BT_ERR("Not enough space in buffer"); rx.discard = rx.remaining; reset_rx(); } else { copy_hdr(rx.buf); } } } static inline void process_tx(void) { int bytes; if (!tx.buf) { tx.buf = net_buf_get(&tx.fifo, K_NO_WAIT); if (!tx.buf) { BT_ERR("TX interrupt but no pending buffer!"); uart_irq_tx_disable(h4_dev); return; } } if (!tx.type) { switch (bt_buf_get_type(tx.buf)) { case BT_BUF_ACL_OUT: tx.type = H4_ACL; break; case BT_BUF_CMD: tx.type = H4_CMD; break; default: BT_ERR("Unknown buffer type"); goto done; } bytes = uart_fifo_fill(h4_dev, &tx.type, 1); if (bytes != 1) { BT_WARN("Unable to send H:4 type"); tx.type = H4_NONE; return; } } bytes = uart_fifo_fill(h4_dev, tx.buf->data, tx.buf->len); net_buf_pull(tx.buf, bytes); if (tx.buf->len) { return; } done: tx.type = H4_NONE; net_buf_unref(tx.buf); tx.buf = net_buf_get(&tx.fifo, K_NO_WAIT); if (!tx.buf) { uart_irq_tx_disable(h4_dev); } } static inline void process_rx(void) { BT_DBG("remaining %u discard %u have_hdr %u rx.buf %p len %u", rx.remaining, rx.discard, rx.have_hdr, rx.buf, rx.buf ? rx.buf->len : 0); if (rx.discard) { rx.discard -= h4_discard(h4_dev, rx.discard); return; } if (rx.have_hdr) { read_payload(); } else { read_header(); } } static void bt_uart_isr(struct device *unused) { ARG_UNUSED(unused); while (uart_irq_update(h4_dev) && uart_irq_is_pending(h4_dev)) { if (uart_irq_tx_ready(h4_dev)) { process_tx(); } if (uart_irq_rx_ready(h4_dev)) { process_rx(); } } } static int h4_send(struct net_buf *buf) { BT_DBG("buf %p type %u len %u", buf, bt_buf_get_type(buf), buf->len); net_buf_put(&tx.fifo, buf); uart_irq_tx_enable(h4_dev); return 0; } /** Setup the HCI transport, which usually means to reset the Bluetooth IC * * @param dev The device structure for the bus connecting to the IC * * @return 0 on success, negative error value on failure */ int __weak bt_hci_transport_setup(struct device *dev) { h4_discard(h4_dev, 32); return 0; } static int h4_open(void) { int ret; BT_DBG(""); uart_irq_rx_disable(h4_dev); uart_irq_tx_disable(h4_dev); ret = bt_hci_transport_setup(h4_dev); if (ret < 0) { return -EIO; } uart_irq_callback_set(h4_dev, bt_uart_isr); k_thread_create(&rx_thread_data, rx_thread_stack, K_THREAD_STACK_SIZEOF(rx_thread_stack), rx_thread, NULL, NULL, NULL, K_PRIO_COOP(CONFIG_BT_RX_PRIO), 0, K_NO_WAIT); return 0; } static const struct bt_hci_driver drv = { .name = "H:4", .bus = BT_HCI_DRIVER_BUS_UART, .open = h4_open, .send = h4_send, }; static int bt_uart_init(struct device *unused) { ARG_UNUSED(unused); h4_dev = device_get_binding(CONFIG_BT_UART_ON_DEV_NAME); if (!h4_dev) { return -EINVAL; } bt_hci_driver_register(&drv); return 0; } SYS_INIT(bt_uart_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE); |