usb_serial.c revision 228631
1/* $NetBSD: ucom.c,v 1.40 2001/11/13 06:24:54 lukem Exp $ */ 2 3/*- 4 * Copyright (c) 2001-2003, 2005, 2008 5 * Shunsuke Akiyama <akiyama@jp.FreeBSD.org>. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD: head/sys/dev/usb/serial/usb_serial.c 228631 2011-12-17 15:08:43Z avg $"); 32 33/*- 34 * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. 35 * All rights reserved. 36 * 37 * This code is derived from software contributed to The NetBSD Foundation 38 * by Lennart Augustsson (lennart@augustsson.net) at 39 * Carlstedt Research & Technology. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * This product includes software developed by the NetBSD 52 * Foundation, Inc. and its contributors. 53 * 4. Neither the name of The NetBSD Foundation nor the names of its 54 * contributors may be used to endorse or promote products derived 55 * from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 58 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 59 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 60 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 61 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 62 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 63 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 64 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 65 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 66 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 67 * POSSIBILITY OF SUCH DAMAGE. 68 */ 69 70#include <sys/stdint.h> 71#include <sys/stddef.h> 72#include <sys/param.h> 73#include <sys/queue.h> 74#include <sys/types.h> 75#include <sys/systm.h> 76#include <sys/kernel.h> 77#include <sys/bus.h> 78#include <sys/module.h> 79#include <sys/lock.h> 80#include <sys/mutex.h> 81#include <sys/condvar.h> 82#include <sys/sysctl.h> 83#include <sys/sx.h> 84#include <sys/unistd.h> 85#include <sys/callout.h> 86#include <sys/malloc.h> 87#include <sys/priv.h> 88#include <sys/cons.h> 89#include <sys/kdb.h> 90 91#include <dev/usb/usb.h> 92#include <dev/usb/usbdi.h> 93#include <dev/usb/usbdi_util.h> 94 95#define USB_DEBUG_VAR ucom_debug 96#include <dev/usb/usb_debug.h> 97#include <dev/usb/usb_busdma.h> 98#include <dev/usb/usb_process.h> 99 100#include <dev/usb/serial/usb_serial.h> 101 102#include "opt_gdb.h" 103 104static SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW, 0, "USB ucom"); 105 106#ifdef USB_DEBUG 107static int ucom_debug = 0; 108 109SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RW, 110 &ucom_debug, 0, "ucom debug level"); 111#endif 112 113#define UCOM_CONS_BUFSIZE 1024 114 115static uint8_t ucom_cons_rx_buf[UCOM_CONS_BUFSIZE]; 116static uint8_t ucom_cons_tx_buf[UCOM_CONS_BUFSIZE]; 117 118static unsigned int ucom_cons_rx_low = 0; 119static unsigned int ucom_cons_rx_high = 0; 120 121static unsigned int ucom_cons_tx_low = 0; 122static unsigned int ucom_cons_tx_high = 0; 123 124static int ucom_cons_unit = -1; 125static int ucom_cons_subunit = 0; 126static int ucom_cons_baud = 9600; 127static struct ucom_softc *ucom_cons_softc = NULL; 128 129TUNABLE_INT("hw.usb.ucom.cons_unit", &ucom_cons_unit); 130SYSCTL_INT(_hw_usb_ucom, OID_AUTO, cons_unit, CTLFLAG_RW, 131 &ucom_cons_unit, 0, "console unit number"); 132TUNABLE_INT("hw.usb.ucom.cons_subunit", &ucom_cons_subunit); 133SYSCTL_INT(_hw_usb_ucom, OID_AUTO, cons_subunit, CTLFLAG_RW, 134 &ucom_cons_subunit, 0, "console subunit number"); 135TUNABLE_INT("hw.usb.ucom.cons_baud", &ucom_cons_baud); 136SYSCTL_INT(_hw_usb_ucom, OID_AUTO, cons_baud, CTLFLAG_RW, 137 &ucom_cons_baud, 0, "console baud rate"); 138 139static usb_proc_callback_t ucom_cfg_start_transfers; 140static usb_proc_callback_t ucom_cfg_open; 141static usb_proc_callback_t ucom_cfg_close; 142static usb_proc_callback_t ucom_cfg_line_state; 143static usb_proc_callback_t ucom_cfg_status_change; 144static usb_proc_callback_t ucom_cfg_param; 145 146static int ucom_unit_alloc(void); 147static void ucom_unit_free(int); 148static int ucom_attach_tty(struct ucom_super_softc *, struct ucom_softc *); 149static void ucom_detach_tty(struct ucom_softc *); 150static void ucom_queue_command(struct ucom_softc *, 151 usb_proc_callback_t *, struct termios *pt, 152 struct usb_proc_msg *t0, struct usb_proc_msg *t1); 153static void ucom_shutdown(struct ucom_softc *); 154static void ucom_ring(struct ucom_softc *, uint8_t); 155static void ucom_break(struct ucom_softc *, uint8_t); 156static void ucom_dtr(struct ucom_softc *, uint8_t); 157static void ucom_rts(struct ucom_softc *, uint8_t); 158 159static tsw_open_t ucom_open; 160static tsw_close_t ucom_close; 161static tsw_ioctl_t ucom_ioctl; 162static tsw_modem_t ucom_modem; 163static tsw_param_t ucom_param; 164static tsw_outwakeup_t ucom_outwakeup; 165static tsw_free_t ucom_free; 166 167static struct ttydevsw ucom_class = { 168 .tsw_flags = TF_INITLOCK | TF_CALLOUT, 169 .tsw_open = ucom_open, 170 .tsw_close = ucom_close, 171 .tsw_outwakeup = ucom_outwakeup, 172 .tsw_ioctl = ucom_ioctl, 173 .tsw_param = ucom_param, 174 .tsw_modem = ucom_modem, 175 .tsw_free = ucom_free, 176}; 177 178MODULE_DEPEND(ucom, usb, 1, 1, 1); 179MODULE_VERSION(ucom, 1); 180 181#define UCOM_UNIT_MAX 128 /* limits size of ucom_bitmap */ 182 183static uint8_t ucom_bitmap[(UCOM_UNIT_MAX + 7) / 8]; 184static struct mtx ucom_bitmap_mtx; 185MTX_SYSINIT(ucom_bitmap_mtx, &ucom_bitmap_mtx, "ucom bitmap", MTX_DEF); 186 187#define UCOM_TTY_PREFIX "U" 188 189/* 190 * Mark a unit number (the X in cuaUX) as in use. 191 * 192 * Note that devices using a different naming scheme (see ucom_tty_name() 193 * callback) still use this unit allocation. 194 */ 195static int 196ucom_unit_alloc(void) 197{ 198 int unit; 199 200 mtx_lock(&ucom_bitmap_mtx); 201 202 for (unit = 0; unit < UCOM_UNIT_MAX; unit++) { 203 if ((ucom_bitmap[unit / 8] & (1 << (unit % 8))) == 0) { 204 ucom_bitmap[unit / 8] |= (1 << (unit % 8)); 205 break; 206 } 207 } 208 209 mtx_unlock(&ucom_bitmap_mtx); 210 211 if (unit == UCOM_UNIT_MAX) 212 return -1; 213 else 214 return unit; 215} 216 217/* 218 * Mark the unit number as not in use. 219 */ 220static void 221ucom_unit_free(int unit) 222{ 223 mtx_lock(&ucom_bitmap_mtx); 224 225 ucom_bitmap[unit / 8] &= ~(1 << (unit % 8)); 226 227 mtx_unlock(&ucom_bitmap_mtx); 228} 229 230/* 231 * Setup a group of one or more serial ports. 232 * 233 * The mutex pointed to by "mtx" is applied before all 234 * callbacks are called back. Also "mtx" must be applied 235 * before calling into the ucom-layer! 236 */ 237int 238ucom_attach(struct ucom_super_softc *ssc, struct ucom_softc *sc, 239 uint32_t subunits, void *parent, 240 const struct ucom_callback *callback, struct mtx *mtx) 241{ 242 uint32_t subunit; 243 int error = 0; 244 245 if ((sc == NULL) || 246 (subunits == 0) || 247 (callback == NULL)) { 248 return (EINVAL); 249 } 250 251 ssc->sc_unit = ucom_unit_alloc(); 252 if (ssc->sc_unit == -1) 253 return (ENOMEM); 254 255 error = usb_proc_create(&ssc->sc_tq, mtx, "ucom", USB_PRI_MED); 256 if (error) { 257 ucom_unit_free(ssc->sc_unit); 258 return (error); 259 } 260 ssc->sc_subunits = subunits; 261 262 for (subunit = 0; subunit < ssc->sc_subunits; subunit++) { 263 sc[subunit].sc_subunit = subunit; 264 sc[subunit].sc_super = ssc; 265 sc[subunit].sc_mtx = mtx; 266 sc[subunit].sc_parent = parent; 267 sc[subunit].sc_callback = callback; 268 269 error = ucom_attach_tty(ssc, &sc[subunit]); 270 if (error) { 271 ucom_detach(ssc, &sc[0]); 272 return (error); 273 } 274 sc[subunit].sc_flag |= UCOM_FLAG_ATTACHED; 275 } 276 277 DPRINTF("tp = %p, unit = %d, subunits = %d\n", 278 sc->sc_tty, ssc->sc_unit, ssc->sc_subunits); 279 280 return (0); 281} 282 283/* 284 * NOTE: the following function will do nothing if 285 * the structure pointed to by "ssc" and "sc" is zero. 286 */ 287void 288ucom_detach(struct ucom_super_softc *ssc, struct ucom_softc *sc) 289{ 290 uint32_t subunit; 291 292 if (ssc->sc_subunits == 0) 293 return; /* not initialized */ 294 295 usb_proc_drain(&ssc->sc_tq); 296 297 for (subunit = 0; subunit < ssc->sc_subunits; subunit++) { 298 if (sc[subunit].sc_flag & UCOM_FLAG_ATTACHED) { 299 300 ucom_detach_tty(&sc[subunit]); 301 302 /* avoid duplicate detach */ 303 sc[subunit].sc_flag &= ~UCOM_FLAG_ATTACHED; 304 } 305 } 306 ucom_unit_free(ssc->sc_unit); 307 usb_proc_free(&ssc->sc_tq); 308} 309 310static int 311ucom_attach_tty(struct ucom_super_softc *ssc, struct ucom_softc *sc) 312{ 313 struct tty *tp; 314 char buf[32]; /* temporary TTY device name buffer */ 315 316 tp = tty_alloc_mutex(&ucom_class, sc, sc->sc_mtx); 317 if (tp == NULL) 318 return (ENOMEM); 319 320 /* Check if the client has a custom TTY name */ 321 buf[0] = '\0'; 322 if (sc->sc_callback->ucom_tty_name) { 323 sc->sc_callback->ucom_tty_name(sc, buf, 324 sizeof(buf), ssc->sc_unit, sc->sc_subunit); 325 } 326 if (buf[0] == 0) { 327 /* Use default TTY name */ 328 if (ssc->sc_subunits > 1) { 329 /* multiple modems in one */ 330 snprintf(buf, sizeof(buf), UCOM_TTY_PREFIX "%u.%u", 331 ssc->sc_unit, sc->sc_subunit); 332 } else { 333 /* single modem */ 334 snprintf(buf, sizeof(buf), UCOM_TTY_PREFIX "%u", 335 ssc->sc_unit); 336 } 337 } 338 tty_makedev(tp, NULL, "%s", buf); 339 340 sc->sc_tty = tp; 341 342 DPRINTF("ttycreate: %s\n", buf); 343 cv_init(&sc->sc_cv, "ucom"); 344 345 /* Check if this device should be a console */ 346 if ((ucom_cons_softc == NULL) && 347 (ssc->sc_unit == ucom_cons_unit) && 348 (sc->sc_subunit == ucom_cons_subunit)) { 349 struct termios t; 350 351 DPRINTF("unit %d subunit %d is console", ssc->sc_unit, sc->sc_subunit); 352 353 ucom_cons_softc = sc; 354 355 memset(&t, 0, sizeof(t)); 356 t.c_ispeed = ucom_cons_baud; 357 t.c_ospeed = t.c_ispeed; 358 t.c_cflag = CS8; 359 360 mtx_lock(ucom_cons_softc->sc_mtx); 361 ucom_cons_rx_low = 0; 362 ucom_cons_rx_high = 0; 363 ucom_cons_tx_low = 0; 364 ucom_cons_tx_high = 0; 365 sc->sc_flag |= UCOM_FLAG_CONSOLE; 366 ucom_open(ucom_cons_softc->sc_tty); 367 ucom_param(ucom_cons_softc->sc_tty, &t); 368 mtx_unlock(ucom_cons_softc->sc_mtx); 369 } 370 371 return (0); 372} 373 374static void 375ucom_detach_tty(struct ucom_softc *sc) 376{ 377 struct tty *tp = sc->sc_tty; 378 379 DPRINTF("sc = %p, tp = %p\n", sc, sc->sc_tty); 380 381 if (sc->sc_flag & UCOM_FLAG_CONSOLE) { 382 mtx_lock(ucom_cons_softc->sc_mtx); 383 ucom_close(ucom_cons_softc->sc_tty); 384 sc->sc_flag &= ~UCOM_FLAG_CONSOLE; 385 mtx_unlock(ucom_cons_softc->sc_mtx); 386 ucom_cons_softc = NULL; 387 } 388 389 /* the config thread has been stopped when we get here */ 390 391 mtx_lock(sc->sc_mtx); 392 sc->sc_flag |= UCOM_FLAG_GONE; 393 sc->sc_flag &= ~(UCOM_FLAG_HL_READY | UCOM_FLAG_LL_READY); 394 mtx_unlock(sc->sc_mtx); 395 if (tp) { 396 tty_lock(tp); 397 398 ucom_close(tp); /* close, if any */ 399 400 tty_rel_gone(tp); 401 402 mtx_lock(sc->sc_mtx); 403 /* Wait for the callback after the TTY is torn down */ 404 while (sc->sc_ttyfreed == 0) 405 cv_wait(&sc->sc_cv, sc->sc_mtx); 406 /* 407 * make sure that read and write transfers are stopped 408 */ 409 if (sc->sc_callback->ucom_stop_read) { 410 (sc->sc_callback->ucom_stop_read) (sc); 411 } 412 if (sc->sc_callback->ucom_stop_write) { 413 (sc->sc_callback->ucom_stop_write) (sc); 414 } 415 mtx_unlock(sc->sc_mtx); 416 } 417 cv_destroy(&sc->sc_cv); 418} 419 420void 421ucom_set_pnpinfo_usb(struct ucom_super_softc *ssc, device_t dev) 422{ 423 char buf[64]; 424 uint8_t iface_index; 425 struct usb_attach_arg *uaa; 426 427 snprintf(buf, sizeof(buf), "ttyname=%s%d ttyports=%d", 428 UCOM_TTY_PREFIX, ssc->sc_unit, ssc->sc_subunits); 429 430 /* Store the PNP info in the first interface for the dev */ 431 uaa = device_get_ivars(dev); 432 iface_index = uaa->info.bIfaceIndex; 433 434 if (usbd_set_pnpinfo(uaa->device, iface_index, buf) != 0) 435 device_printf(dev, "Could not set PNP info\n"); 436} 437 438static void 439ucom_queue_command(struct ucom_softc *sc, 440 usb_proc_callback_t *fn, struct termios *pt, 441 struct usb_proc_msg *t0, struct usb_proc_msg *t1) 442{ 443 struct ucom_super_softc *ssc = sc->sc_super; 444 struct ucom_param_task *task; 445 446 mtx_assert(sc->sc_mtx, MA_OWNED); 447 448 if (usb_proc_is_gone(&ssc->sc_tq)) { 449 DPRINTF("proc is gone\n"); 450 return; /* nothing to do */ 451 } 452 /* 453 * NOTE: The task cannot get executed before we drop the 454 * "sc_mtx" mutex. It is safe to update fields in the message 455 * structure after that the message got queued. 456 */ 457 task = (struct ucom_param_task *) 458 usb_proc_msignal(&ssc->sc_tq, t0, t1); 459 460 /* Setup callback and softc pointers */ 461 task->hdr.pm_callback = fn; 462 task->sc = sc; 463 464 /* 465 * Make a copy of the termios. This field is only present if 466 * the "pt" field is not NULL. 467 */ 468 if (pt != NULL) 469 task->termios_copy = *pt; 470 471 /* 472 * Closing the device should be synchronous. 473 */ 474 if (fn == ucom_cfg_close) 475 usb_proc_mwait(&ssc->sc_tq, t0, t1); 476 477 /* 478 * In case of multiple configure requests, 479 * keep track of the last one! 480 */ 481 if (fn == ucom_cfg_start_transfers) 482 sc->sc_last_start_xfer = &task->hdr; 483} 484 485static void 486ucom_shutdown(struct ucom_softc *sc) 487{ 488 struct tty *tp = sc->sc_tty; 489 490 mtx_assert(sc->sc_mtx, MA_OWNED); 491 492 DPRINTF("\n"); 493 494 /* 495 * Hang up if necessary: 496 */ 497 if (tp->t_termios.c_cflag & HUPCL) { 498 ucom_modem(tp, 0, SER_DTR); 499 } 500} 501 502/* 503 * Return values: 504 * 0: normal 505 * else: taskqueue is draining or gone 506 */ 507uint8_t 508ucom_cfg_is_gone(struct ucom_softc *sc) 509{ 510 struct ucom_super_softc *ssc = sc->sc_super; 511 512 return (usb_proc_is_gone(&ssc->sc_tq)); 513} 514 515static void 516ucom_cfg_start_transfers(struct usb_proc_msg *_task) 517{ 518 struct ucom_cfg_task *task = 519 (struct ucom_cfg_task *)_task; 520 struct ucom_softc *sc = task->sc; 521 522 if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { 523 return; 524 } 525 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 526 /* TTY device closed */ 527 return; 528 } 529 530 if (_task == sc->sc_last_start_xfer) 531 sc->sc_flag |= UCOM_FLAG_GP_DATA; 532 533 if (sc->sc_callback->ucom_start_read) { 534 (sc->sc_callback->ucom_start_read) (sc); 535 } 536 if (sc->sc_callback->ucom_start_write) { 537 (sc->sc_callback->ucom_start_write) (sc); 538 } 539} 540 541static void 542ucom_start_transfers(struct ucom_softc *sc) 543{ 544 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 545 return; 546 } 547 /* 548 * Make sure that data transfers are started in both 549 * directions: 550 */ 551 if (sc->sc_callback->ucom_start_read) { 552 (sc->sc_callback->ucom_start_read) (sc); 553 } 554 if (sc->sc_callback->ucom_start_write) { 555 (sc->sc_callback->ucom_start_write) (sc); 556 } 557} 558 559static void 560ucom_cfg_open(struct usb_proc_msg *_task) 561{ 562 struct ucom_cfg_task *task = 563 (struct ucom_cfg_task *)_task; 564 struct ucom_softc *sc = task->sc; 565 566 DPRINTF("\n"); 567 568 if (sc->sc_flag & UCOM_FLAG_LL_READY) { 569 570 /* already opened */ 571 572 } else { 573 574 sc->sc_flag |= UCOM_FLAG_LL_READY; 575 576 if (sc->sc_callback->ucom_cfg_open) { 577 (sc->sc_callback->ucom_cfg_open) (sc); 578 579 /* wait a little */ 580 usb_pause_mtx(sc->sc_mtx, hz / 10); 581 } 582 } 583} 584 585static int 586ucom_open(struct tty *tp) 587{ 588 struct ucom_softc *sc = tty_softc(tp); 589 int error; 590 591 mtx_assert(sc->sc_mtx, MA_OWNED); 592 593 if (sc->sc_flag & UCOM_FLAG_GONE) { 594 return (ENXIO); 595 } 596 if (sc->sc_flag & UCOM_FLAG_HL_READY) { 597 /* already opened */ 598 return (0); 599 } 600 DPRINTF("tp = %p\n", tp); 601 602 if (sc->sc_callback->ucom_pre_open) { 603 /* 604 * give the lower layer a chance to disallow TTY open, for 605 * example if the device is not present: 606 */ 607 error = (sc->sc_callback->ucom_pre_open) (sc); 608 if (error) { 609 return (error); 610 } 611 } 612 sc->sc_flag |= UCOM_FLAG_HL_READY; 613 614 /* Disable transfers */ 615 sc->sc_flag &= ~UCOM_FLAG_GP_DATA; 616 617 sc->sc_lsr = 0; 618 sc->sc_msr = 0; 619 sc->sc_mcr = 0; 620 621 /* reset programmed line state */ 622 sc->sc_pls_curr = 0; 623 sc->sc_pls_set = 0; 624 sc->sc_pls_clr = 0; 625 626 ucom_queue_command(sc, ucom_cfg_open, NULL, 627 &sc->sc_open_task[0].hdr, 628 &sc->sc_open_task[1].hdr); 629 630 /* Queue transfer enable command last */ 631 ucom_queue_command(sc, ucom_cfg_start_transfers, NULL, 632 &sc->sc_start_task[0].hdr, 633 &sc->sc_start_task[1].hdr); 634 635 ucom_modem(tp, SER_DTR | SER_RTS, 0); 636 637 ucom_ring(sc, 0); 638 639 ucom_break(sc, 0); 640 641 ucom_status_change(sc); 642 643 return (0); 644} 645 646static void 647ucom_cfg_close(struct usb_proc_msg *_task) 648{ 649 struct ucom_cfg_task *task = 650 (struct ucom_cfg_task *)_task; 651 struct ucom_softc *sc = task->sc; 652 653 DPRINTF("\n"); 654 655 if (sc->sc_flag & UCOM_FLAG_LL_READY) { 656 sc->sc_flag &= ~UCOM_FLAG_LL_READY; 657 if (sc->sc_callback->ucom_cfg_close) 658 (sc->sc_callback->ucom_cfg_close) (sc); 659 } else { 660 /* already closed */ 661 } 662} 663 664static void 665ucom_close(struct tty *tp) 666{ 667 struct ucom_softc *sc = tty_softc(tp); 668 669 mtx_assert(sc->sc_mtx, MA_OWNED); 670 671 DPRINTF("tp=%p\n", tp); 672 673 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 674 DPRINTF("tp=%p already closed\n", tp); 675 return; 676 } 677 ucom_shutdown(sc); 678 679 ucom_queue_command(sc, ucom_cfg_close, NULL, 680 &sc->sc_close_task[0].hdr, 681 &sc->sc_close_task[1].hdr); 682 683 sc->sc_flag &= ~(UCOM_FLAG_HL_READY | UCOM_FLAG_RTS_IFLOW); 684 685 if (sc->sc_callback->ucom_stop_read) { 686 (sc->sc_callback->ucom_stop_read) (sc); 687 } 688} 689 690static int 691ucom_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) 692{ 693 struct ucom_softc *sc = tty_softc(tp); 694 int error; 695 696 mtx_assert(sc->sc_mtx, MA_OWNED); 697 698 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 699 return (EIO); 700 } 701 DPRINTF("cmd = 0x%08lx\n", cmd); 702 703 switch (cmd) { 704#if 0 705 case TIOCSRING: 706 ucom_ring(sc, 1); 707 error = 0; 708 break; 709 case TIOCCRING: 710 ucom_ring(sc, 0); 711 error = 0; 712 break; 713#endif 714 case TIOCSBRK: 715 ucom_break(sc, 1); 716 error = 0; 717 break; 718 case TIOCCBRK: 719 ucom_break(sc, 0); 720 error = 0; 721 break; 722 default: 723 if (sc->sc_callback->ucom_ioctl) { 724 error = (sc->sc_callback->ucom_ioctl) 725 (sc, cmd, data, 0, td); 726 } else { 727 error = ENOIOCTL; 728 } 729 break; 730 } 731 return (error); 732} 733 734static int 735ucom_modem(struct tty *tp, int sigon, int sigoff) 736{ 737 struct ucom_softc *sc = tty_softc(tp); 738 uint8_t onoff; 739 740 mtx_assert(sc->sc_mtx, MA_OWNED); 741 742 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 743 return (0); 744 } 745 if ((sigon == 0) && (sigoff == 0)) { 746 747 if (sc->sc_mcr & SER_DTR) { 748 sigon |= SER_DTR; 749 } 750 if (sc->sc_mcr & SER_RTS) { 751 sigon |= SER_RTS; 752 } 753 if (sc->sc_msr & SER_CTS) { 754 sigon |= SER_CTS; 755 } 756 if (sc->sc_msr & SER_DCD) { 757 sigon |= SER_DCD; 758 } 759 if (sc->sc_msr & SER_DSR) { 760 sigon |= SER_DSR; 761 } 762 if (sc->sc_msr & SER_RI) { 763 sigon |= SER_RI; 764 } 765 return (sigon); 766 } 767 if (sigon & SER_DTR) { 768 sc->sc_mcr |= SER_DTR; 769 } 770 if (sigoff & SER_DTR) { 771 sc->sc_mcr &= ~SER_DTR; 772 } 773 if (sigon & SER_RTS) { 774 sc->sc_mcr |= SER_RTS; 775 } 776 if (sigoff & SER_RTS) { 777 sc->sc_mcr &= ~SER_RTS; 778 } 779 onoff = (sc->sc_mcr & SER_DTR) ? 1 : 0; 780 ucom_dtr(sc, onoff); 781 782 onoff = (sc->sc_mcr & SER_RTS) ? 1 : 0; 783 ucom_rts(sc, onoff); 784 785 return (0); 786} 787 788static void 789ucom_cfg_line_state(struct usb_proc_msg *_task) 790{ 791 struct ucom_cfg_task *task = 792 (struct ucom_cfg_task *)_task; 793 struct ucom_softc *sc = task->sc; 794 uint8_t notch_bits; 795 uint8_t any_bits; 796 uint8_t prev_value; 797 uint8_t last_value; 798 uint8_t mask; 799 800 if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { 801 return; 802 } 803 804 mask = 0; 805 /* compute callback mask */ 806 if (sc->sc_callback->ucom_cfg_set_dtr) 807 mask |= UCOM_LS_DTR; 808 if (sc->sc_callback->ucom_cfg_set_rts) 809 mask |= UCOM_LS_RTS; 810 if (sc->sc_callback->ucom_cfg_set_break) 811 mask |= UCOM_LS_BREAK; 812 if (sc->sc_callback->ucom_cfg_set_ring) 813 mask |= UCOM_LS_RING; 814 815 /* compute the bits we are to program */ 816 notch_bits = (sc->sc_pls_set & sc->sc_pls_clr) & mask; 817 any_bits = (sc->sc_pls_set | sc->sc_pls_clr) & mask; 818 prev_value = sc->sc_pls_curr ^ notch_bits; 819 last_value = sc->sc_pls_curr; 820 821 /* reset programmed line state */ 822 sc->sc_pls_curr = 0; 823 sc->sc_pls_set = 0; 824 sc->sc_pls_clr = 0; 825 826 /* ensure that we don't loose any levels */ 827 if (notch_bits & UCOM_LS_DTR) 828 sc->sc_callback->ucom_cfg_set_dtr(sc, 829 (prev_value & UCOM_LS_DTR) ? 1 : 0); 830 if (notch_bits & UCOM_LS_RTS) 831 sc->sc_callback->ucom_cfg_set_rts(sc, 832 (prev_value & UCOM_LS_RTS) ? 1 : 0); 833 if (notch_bits & UCOM_LS_BREAK) 834 sc->sc_callback->ucom_cfg_set_break(sc, 835 (prev_value & UCOM_LS_BREAK) ? 1 : 0); 836 if (notch_bits & UCOM_LS_RING) 837 sc->sc_callback->ucom_cfg_set_ring(sc, 838 (prev_value & UCOM_LS_RING) ? 1 : 0); 839 840 /* set last value */ 841 if (any_bits & UCOM_LS_DTR) 842 sc->sc_callback->ucom_cfg_set_dtr(sc, 843 (last_value & UCOM_LS_DTR) ? 1 : 0); 844 if (any_bits & UCOM_LS_RTS) 845 sc->sc_callback->ucom_cfg_set_rts(sc, 846 (last_value & UCOM_LS_RTS) ? 1 : 0); 847 if (any_bits & UCOM_LS_BREAK) 848 sc->sc_callback->ucom_cfg_set_break(sc, 849 (last_value & UCOM_LS_BREAK) ? 1 : 0); 850 if (any_bits & UCOM_LS_RING) 851 sc->sc_callback->ucom_cfg_set_ring(sc, 852 (last_value & UCOM_LS_RING) ? 1 : 0); 853} 854 855static void 856ucom_line_state(struct ucom_softc *sc, 857 uint8_t set_bits, uint8_t clear_bits) 858{ 859 mtx_assert(sc->sc_mtx, MA_OWNED); 860 861 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 862 return; 863 } 864 865 DPRINTF("on=0x%02x, off=0x%02x\n", set_bits, clear_bits); 866 867 /* update current programmed line state */ 868 sc->sc_pls_curr |= set_bits; 869 sc->sc_pls_curr &= ~clear_bits; 870 sc->sc_pls_set |= set_bits; 871 sc->sc_pls_clr |= clear_bits; 872 873 /* defer driver programming */ 874 ucom_queue_command(sc, ucom_cfg_line_state, NULL, 875 &sc->sc_line_state_task[0].hdr, 876 &sc->sc_line_state_task[1].hdr); 877} 878 879static void 880ucom_ring(struct ucom_softc *sc, uint8_t onoff) 881{ 882 DPRINTF("onoff = %d\n", onoff); 883 884 if (onoff) 885 ucom_line_state(sc, UCOM_LS_RING, 0); 886 else 887 ucom_line_state(sc, 0, UCOM_LS_RING); 888} 889 890static void 891ucom_break(struct ucom_softc *sc, uint8_t onoff) 892{ 893 DPRINTF("onoff = %d\n", onoff); 894 895 if (onoff) 896 ucom_line_state(sc, UCOM_LS_BREAK, 0); 897 else 898 ucom_line_state(sc, 0, UCOM_LS_BREAK); 899} 900 901static void 902ucom_dtr(struct ucom_softc *sc, uint8_t onoff) 903{ 904 DPRINTF("onoff = %d\n", onoff); 905 906 if (onoff) 907 ucom_line_state(sc, UCOM_LS_DTR, 0); 908 else 909 ucom_line_state(sc, 0, UCOM_LS_DTR); 910} 911 912static void 913ucom_rts(struct ucom_softc *sc, uint8_t onoff) 914{ 915 DPRINTF("onoff = %d\n", onoff); 916 917 if (onoff) 918 ucom_line_state(sc, UCOM_LS_RTS, 0); 919 else 920 ucom_line_state(sc, 0, UCOM_LS_RTS); 921} 922 923static void 924ucom_cfg_status_change(struct usb_proc_msg *_task) 925{ 926 struct ucom_cfg_task *task = 927 (struct ucom_cfg_task *)_task; 928 struct ucom_softc *sc = task->sc; 929 struct tty *tp; 930 uint8_t new_msr; 931 uint8_t new_lsr; 932 uint8_t onoff; 933 uint8_t lsr_delta; 934 935 tp = sc->sc_tty; 936 937 mtx_assert(sc->sc_mtx, MA_OWNED); 938 939 if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { 940 return; 941 } 942 if (sc->sc_callback->ucom_cfg_get_status == NULL) { 943 return; 944 } 945 /* get status */ 946 947 new_msr = 0; 948 new_lsr = 0; 949 950 (sc->sc_callback->ucom_cfg_get_status) (sc, &new_lsr, &new_msr); 951 952 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 953 /* TTY device closed */ 954 return; 955 } 956 onoff = ((sc->sc_msr ^ new_msr) & SER_DCD); 957 lsr_delta = (sc->sc_lsr ^ new_lsr); 958 959 sc->sc_msr = new_msr; 960 sc->sc_lsr = new_lsr; 961 962 if (onoff) { 963 964 onoff = (sc->sc_msr & SER_DCD) ? 1 : 0; 965 966 DPRINTF("DCD changed to %d\n", onoff); 967 968 ttydisc_modem(tp, onoff); 969 } 970 971 if ((lsr_delta & ULSR_BI) && (sc->sc_lsr & ULSR_BI)) { 972 973 DPRINTF("BREAK detected\n"); 974 975 ttydisc_rint(tp, 0, TRE_BREAK); 976 ttydisc_rint_done(tp); 977 } 978 979 if ((lsr_delta & ULSR_FE) && (sc->sc_lsr & ULSR_FE)) { 980 981 DPRINTF("Frame error detected\n"); 982 983 ttydisc_rint(tp, 0, TRE_FRAMING); 984 ttydisc_rint_done(tp); 985 } 986 987 if ((lsr_delta & ULSR_PE) && (sc->sc_lsr & ULSR_PE)) { 988 989 DPRINTF("Parity error detected\n"); 990 991 ttydisc_rint(tp, 0, TRE_PARITY); 992 ttydisc_rint_done(tp); 993 } 994} 995 996void 997ucom_status_change(struct ucom_softc *sc) 998{ 999 mtx_assert(sc->sc_mtx, MA_OWNED); 1000 1001 if (sc->sc_flag & UCOM_FLAG_CONSOLE) 1002 return; /* not supported */ 1003 1004 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 1005 return; 1006 } 1007 DPRINTF("\n"); 1008 1009 ucom_queue_command(sc, ucom_cfg_status_change, NULL, 1010 &sc->sc_status_task[0].hdr, 1011 &sc->sc_status_task[1].hdr); 1012} 1013 1014static void 1015ucom_cfg_param(struct usb_proc_msg *_task) 1016{ 1017 struct ucom_param_task *task = 1018 (struct ucom_param_task *)_task; 1019 struct ucom_softc *sc = task->sc; 1020 1021 if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { 1022 return; 1023 } 1024 if (sc->sc_callback->ucom_cfg_param == NULL) { 1025 return; 1026 } 1027 1028 (sc->sc_callback->ucom_cfg_param) (sc, &task->termios_copy); 1029 1030 /* wait a little */ 1031 usb_pause_mtx(sc->sc_mtx, hz / 10); 1032} 1033 1034static int 1035ucom_param(struct tty *tp, struct termios *t) 1036{ 1037 struct ucom_softc *sc = tty_softc(tp); 1038 uint8_t opened; 1039 int error; 1040 1041 mtx_assert(sc->sc_mtx, MA_OWNED); 1042 1043 opened = 0; 1044 error = 0; 1045 1046 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 1047 1048 /* XXX the TTY layer should call "open()" first! */ 1049 1050 error = ucom_open(tp); 1051 if (error) { 1052 goto done; 1053 } 1054 opened = 1; 1055 } 1056 DPRINTF("sc = %p\n", sc); 1057 1058 /* Check requested parameters. */ 1059 if (t->c_ospeed < 0) { 1060 DPRINTF("negative ospeed\n"); 1061 error = EINVAL; 1062 goto done; 1063 } 1064 if (t->c_ispeed && (t->c_ispeed != t->c_ospeed)) { 1065 DPRINTF("mismatch ispeed and ospeed\n"); 1066 error = EINVAL; 1067 goto done; 1068 } 1069 t->c_ispeed = t->c_ospeed; 1070 1071 if (sc->sc_callback->ucom_pre_param) { 1072 /* Let the lower layer verify the parameters */ 1073 error = (sc->sc_callback->ucom_pre_param) (sc, t); 1074 if (error) { 1075 DPRINTF("callback error = %d\n", error); 1076 goto done; 1077 } 1078 } 1079 1080 /* Disable transfers */ 1081 sc->sc_flag &= ~UCOM_FLAG_GP_DATA; 1082 1083 /* Queue baud rate programming command first */ 1084 ucom_queue_command(sc, ucom_cfg_param, t, 1085 &sc->sc_param_task[0].hdr, 1086 &sc->sc_param_task[1].hdr); 1087 1088 /* Queue transfer enable command last */ 1089 ucom_queue_command(sc, ucom_cfg_start_transfers, NULL, 1090 &sc->sc_start_task[0].hdr, 1091 &sc->sc_start_task[1].hdr); 1092 1093 if (t->c_cflag & CRTS_IFLOW) { 1094 sc->sc_flag |= UCOM_FLAG_RTS_IFLOW; 1095 } else if (sc->sc_flag & UCOM_FLAG_RTS_IFLOW) { 1096 sc->sc_flag &= ~UCOM_FLAG_RTS_IFLOW; 1097 ucom_modem(tp, SER_RTS, 0); 1098 } 1099done: 1100 if (error) { 1101 if (opened) { 1102 ucom_close(tp); 1103 } 1104 } 1105 return (error); 1106} 1107 1108static void 1109ucom_outwakeup(struct tty *tp) 1110{ 1111 struct ucom_softc *sc = tty_softc(tp); 1112 1113 mtx_assert(sc->sc_mtx, MA_OWNED); 1114 1115 DPRINTF("sc = %p\n", sc); 1116 1117 if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { 1118 /* The higher layer is not ready */ 1119 return; 1120 } 1121 ucom_start_transfers(sc); 1122} 1123 1124/*------------------------------------------------------------------------* 1125 * ucom_get_data 1126 * 1127 * Return values: 1128 * 0: No data is available. 1129 * Else: Data is available. 1130 *------------------------------------------------------------------------*/ 1131uint8_t 1132ucom_get_data(struct ucom_softc *sc, struct usb_page_cache *pc, 1133 uint32_t offset, uint32_t len, uint32_t *actlen) 1134{ 1135 struct usb_page_search res; 1136 struct tty *tp = sc->sc_tty; 1137 uint32_t cnt; 1138 uint32_t offset_orig; 1139 1140 mtx_assert(sc->sc_mtx, MA_OWNED); 1141 1142 if (sc->sc_flag & UCOM_FLAG_CONSOLE) { 1143 unsigned int temp; 1144 1145 /* get total TX length */ 1146 1147 temp = ucom_cons_tx_high - ucom_cons_tx_low; 1148 temp %= UCOM_CONS_BUFSIZE; 1149 1150 /* limit TX length */ 1151 1152 if (temp > (UCOM_CONS_BUFSIZE - ucom_cons_tx_low)) 1153 temp = (UCOM_CONS_BUFSIZE - ucom_cons_tx_low); 1154 1155 if (temp > len) 1156 temp = len; 1157 1158 /* copy in data */ 1159 1160 usbd_copy_in(pc, offset, ucom_cons_tx_buf + ucom_cons_tx_low, temp); 1161 1162 /* update counters */ 1163 1164 ucom_cons_tx_low += temp; 1165 ucom_cons_tx_low %= UCOM_CONS_BUFSIZE; 1166 1167 /* store actual length */ 1168 1169 *actlen = temp; 1170 1171 return (temp ? 1 : 0); 1172 } 1173 1174 if (tty_gone(tp) || 1175 !(sc->sc_flag & UCOM_FLAG_GP_DATA)) { 1176 actlen[0] = 0; 1177 return (0); /* multiport device polling */ 1178 } 1179 offset_orig = offset; 1180 1181 while (len != 0) { 1182 1183 usbd_get_page(pc, offset, &res); 1184 1185 if (res.length > len) { 1186 res.length = len; 1187 } 1188 /* copy data directly into USB buffer */ 1189 cnt = ttydisc_getc(tp, res.buffer, res.length); 1190 1191 offset += cnt; 1192 len -= cnt; 1193 1194 if (cnt < res.length) { 1195 /* end of buffer */ 1196 break; 1197 } 1198 } 1199 1200 actlen[0] = offset - offset_orig; 1201 1202 DPRINTF("cnt=%d\n", actlen[0]); 1203 1204 if (actlen[0] == 0) { 1205 return (0); 1206 } 1207 return (1); 1208} 1209 1210void 1211ucom_put_data(struct ucom_softc *sc, struct usb_page_cache *pc, 1212 uint32_t offset, uint32_t len) 1213{ 1214 struct usb_page_search res; 1215 struct tty *tp = sc->sc_tty; 1216 char *buf; 1217 uint32_t cnt; 1218 1219 mtx_assert(sc->sc_mtx, MA_OWNED); 1220 1221 if (sc->sc_flag & UCOM_FLAG_CONSOLE) { 1222 unsigned int temp; 1223 1224 /* get maximum RX length */ 1225 1226 temp = (UCOM_CONS_BUFSIZE - 1) - ucom_cons_rx_high + ucom_cons_rx_low; 1227 temp %= UCOM_CONS_BUFSIZE; 1228 1229 /* limit RX length */ 1230 1231 if (temp > (UCOM_CONS_BUFSIZE - ucom_cons_rx_high)) 1232 temp = (UCOM_CONS_BUFSIZE - ucom_cons_rx_high); 1233 1234 if (temp > len) 1235 temp = len; 1236 1237 /* copy out data */ 1238 1239 usbd_copy_out(pc, offset, ucom_cons_rx_buf + ucom_cons_rx_high, temp); 1240 1241 /* update counters */ 1242 1243 ucom_cons_rx_high += temp; 1244 ucom_cons_rx_high %= UCOM_CONS_BUFSIZE; 1245 1246 return; 1247 } 1248 1249 if (tty_gone(tp)) 1250 return; /* multiport device polling */ 1251 1252 if (len == 0) 1253 return; /* no data */ 1254 1255 /* set a flag to prevent recursation ? */ 1256 1257 while (len > 0) { 1258 1259 usbd_get_page(pc, offset, &res); 1260 1261 if (res.length > len) { 1262 res.length = len; 1263 } 1264 len -= res.length; 1265 offset += res.length; 1266 1267 /* pass characters to tty layer */ 1268 1269 buf = res.buffer; 1270 cnt = res.length; 1271 1272 /* first check if we can pass the buffer directly */ 1273 1274 if (ttydisc_can_bypass(tp)) { 1275 if (ttydisc_rint_bypass(tp, buf, cnt) != cnt) { 1276 DPRINTF("tp=%p, data lost\n", tp); 1277 } 1278 continue; 1279 } 1280 /* need to loop */ 1281 1282 for (cnt = 0; cnt != res.length; cnt++) { 1283 if (ttydisc_rint(tp, buf[cnt], 0) == -1) { 1284 /* XXX what should we do? */ 1285 1286 DPRINTF("tp=%p, lost %d " 1287 "chars\n", tp, res.length - cnt); 1288 break; 1289 } 1290 } 1291 } 1292 ttydisc_rint_done(tp); 1293} 1294 1295static void 1296ucom_free(void *xsc) 1297{ 1298 struct ucom_softc *sc = xsc; 1299 1300 mtx_lock(sc->sc_mtx); 1301 sc->sc_ttyfreed = 1; 1302 cv_signal(&sc->sc_cv); 1303 mtx_unlock(sc->sc_mtx); 1304} 1305 1306static cn_probe_t ucom_cnprobe; 1307static cn_init_t ucom_cninit; 1308static cn_term_t ucom_cnterm; 1309static cn_getc_t ucom_cngetc; 1310static cn_putc_t ucom_cnputc; 1311static cn_grab_t ucom_cngrab; 1312static cn_ungrab_t ucom_cnungrab; 1313 1314CONSOLE_DRIVER(ucom); 1315 1316static void 1317ucom_cnprobe(struct consdev *cp) 1318{ 1319 if (ucom_cons_unit != -1) 1320 cp->cn_pri = CN_NORMAL; 1321 else 1322 cp->cn_pri = CN_DEAD; 1323 1324 strlcpy(cp->cn_name, "ucom", sizeof(cp->cn_name)); 1325} 1326 1327static void 1328ucom_cninit(struct consdev *cp) 1329{ 1330} 1331 1332static void 1333ucom_cnterm(struct consdev *cp) 1334{ 1335} 1336 1337static void 1338ucom_cngrab(struct consdev *cp) 1339{ 1340} 1341 1342static void 1343ucom_cnungrab(struct consdev *cp) 1344{ 1345} 1346 1347static int 1348ucom_cngetc(struct consdev *cd) 1349{ 1350 struct ucom_softc *sc = ucom_cons_softc; 1351 int c; 1352 1353 if (sc == NULL) 1354 return (-1); 1355 1356 mtx_lock(sc->sc_mtx); 1357 1358 if (ucom_cons_rx_low != ucom_cons_rx_high) { 1359 c = ucom_cons_rx_buf[ucom_cons_rx_low]; 1360 ucom_cons_rx_low ++; 1361 ucom_cons_rx_low %= UCOM_CONS_BUFSIZE; 1362 } else { 1363 c = -1; 1364 } 1365 1366 /* start USB transfers */ 1367 ucom_outwakeup(sc->sc_tty); 1368 1369 mtx_unlock(sc->sc_mtx); 1370 1371 /* poll if necessary */ 1372 if (kdb_active && sc->sc_callback->ucom_poll) 1373 (sc->sc_callback->ucom_poll) (sc); 1374 1375 return (c); 1376} 1377 1378static void 1379ucom_cnputc(struct consdev *cd, int c) 1380{ 1381 struct ucom_softc *sc = ucom_cons_softc; 1382 unsigned int temp; 1383 1384 if (sc == NULL) 1385 return; 1386 1387 repeat: 1388 1389 mtx_lock(sc->sc_mtx); 1390 1391 /* compute maximum TX length */ 1392 1393 temp = (UCOM_CONS_BUFSIZE - 1) - ucom_cons_tx_high + ucom_cons_tx_low; 1394 temp %= UCOM_CONS_BUFSIZE; 1395 1396 if (temp) { 1397 ucom_cons_tx_buf[ucom_cons_tx_high] = c; 1398 ucom_cons_tx_high ++; 1399 ucom_cons_tx_high %= UCOM_CONS_BUFSIZE; 1400 } 1401 1402 /* start USB transfers */ 1403 ucom_outwakeup(sc->sc_tty); 1404 1405 mtx_unlock(sc->sc_mtx); 1406 1407 /* poll if necessary */ 1408 if (kdb_active && sc->sc_callback->ucom_poll) { 1409 (sc->sc_callback->ucom_poll) (sc); 1410 /* simple flow control */ 1411 if (temp == 0) 1412 goto repeat; 1413 } 1414} 1415 1416#if defined(GDB) 1417 1418#include <gdb/gdb.h> 1419 1420static gdb_probe_f ucom_gdbprobe; 1421static gdb_init_f ucom_gdbinit; 1422static gdb_term_f ucom_gdbterm; 1423static gdb_getc_f ucom_gdbgetc; 1424static gdb_putc_f ucom_gdbputc; 1425 1426GDB_DBGPORT(sio, ucom_gdbprobe, ucom_gdbinit, ucom_gdbterm, ucom_gdbgetc, ucom_gdbputc); 1427 1428static int 1429ucom_gdbprobe(void) 1430{ 1431 return ((ucom_cons_softc != NULL) ? 0 : -1); 1432} 1433 1434static void 1435ucom_gdbinit(void) 1436{ 1437} 1438 1439static void 1440ucom_gdbterm(void) 1441{ 1442} 1443 1444static void 1445ucom_gdbputc(int c) 1446{ 1447 ucom_cnputc(NULL, c); 1448} 1449 1450static int 1451ucom_gdbgetc(void) 1452{ 1453 return (ucom_cngetc(NULL)); 1454} 1455 1456#endif 1457