1 /* $NetBSD: uchcom.c,v 1.40 2021/08/07 16:19:17 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Takuya SHIOZAKI (tshiozak (at) netbsd.org). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: uchcom.c,v 1.40 2021/08/07 16:19:17 thorpej Exp $"); 34 35 #ifdef _KERNEL_OPT 36 #include "opt_usb.h" 37 #endif 38 39 /* 40 * driver for WinChipHead CH341/340, the worst USB-serial chip in the world. 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/kmem.h> 47 #include <sys/ioctl.h> 48 #include <sys/conf.h> 49 #include <sys/tty.h> 50 #include <sys/file.h> 51 #include <sys/select.h> 52 #include <sys/proc.h> 53 #include <sys/device.h> 54 #include <sys/poll.h> 55 56 #include <dev/usb/usb.h> 57 58 #include <dev/usb/usbdi.h> 59 #include <dev/usb/usbdi_util.h> 60 #include <dev/usb/usbdevs.h> 61 62 #include <dev/usb/ucomvar.h> 63 64 #ifdef UCHCOM_DEBUG 65 #define DPRINTFN(n, x) if (uchcomdebug > (n)) printf x 66 int uchcomdebug = 0; 67 #else 68 #define DPRINTFN(n, x) 69 #endif 70 #define DPRINTF(x) DPRINTFN(0, x) 71 72 #define UCHCOM_IFACE_INDEX 0 73 #define UCHCOM_CONFIG_INDEX 0 74 75 #define UCHCOM_INPUT_BUF_SIZE 8 76 77 #define UCHCOM_REQ_GET_VERSION 0x5F 78 #define UCHCOM_REQ_READ_REG 0x95 79 #define UCHCOM_REQ_WRITE_REG 0x9A 80 #define UCHCOM_REQ_RESET 0xA1 81 #define UCHCOM_REQ_SET_DTRRTS 0xA4 82 83 #define UCHCOM_REG_STAT1 0x06 84 #define UCHCOM_REG_STAT2 0x07 85 #define UCHCOM_REG_BPS_PRE 0x12 86 #define UCHCOM_REG_BPS_DIV 0x13 87 #define UCHCOM_REG_BREAK 0x05 88 #define UCHCOM_REG_LCR 0x18 89 #define UCHCOM_REG_LCR2 0x25 90 91 #define UCHCOM_VER_20 0x20 92 #define UCHCOM_VER_30 0x30 93 94 #define UCHCOM_BPS_PRE_IMM 0x80 /* CH341: immediate RX forwarding */ 95 96 #define UCHCOM_DTR_MASK 0x20 97 #define UCHCOM_RTS_MASK 0x40 98 99 #define UCHCOM_BREAK_MASK 0x01 100 101 #define UCHCOM_LCR_CS5 0x00 102 #define UCHCOM_LCR_CS6 0x01 103 #define UCHCOM_LCR_CS7 0x02 104 #define UCHCOM_LCR_CS8 0x03 105 #define UCHCOM_LCR_STOPB 0x04 106 #define UCHCOM_LCR_PARENB 0x08 107 #define UCHCOM_LCR_PARODD 0x00 108 #define UCHCOM_LCR_PAREVEN 0x10 109 #define UCHCOM_LCR_PARMARK 0x20 110 #define UCHCOM_LCR_PARSPACE 0x30 111 #define UCHCOM_LCR_TXE 0x40 112 #define UCHCOM_LCR_RXE 0x80 113 114 #define UCHCOM_INTR_STAT1 0x02 115 #define UCHCOM_INTR_STAT2 0x03 116 #define UCHCOM_INTR_LEAST 4 117 118 #define UCHCOMIBUFSIZE 256 119 #define UCHCOMOBUFSIZE 256 120 121 struct uchcom_softc 122 { 123 device_t sc_dev; 124 struct usbd_device * sc_udev; 125 device_t sc_subdev; 126 struct usbd_interface * sc_iface; 127 bool sc_dying; 128 /* */ 129 int sc_intr_endpoint; 130 int sc_intr_size; 131 struct usbd_pipe * sc_intr_pipe; 132 u_char *sc_intr_buf; 133 /* */ 134 uint8_t sc_version; 135 int sc_dtr; 136 int sc_rts; 137 u_char sc_lsr; 138 u_char sc_msr; 139 }; 140 141 struct uchcom_endpoints 142 { 143 int ep_bulkin; 144 int ep_bulkout; 145 int ep_intr; 146 int ep_intr_size; 147 }; 148 149 struct uchcom_divider 150 { 151 uint8_t dv_prescaler; 152 uint8_t dv_div; 153 }; 154 155 /* 0,1,2,3,7 are prescale factors for given 4x 12000000 clock formula */ 156 static const uint32_t rates4x[8] = { 157 [0] = 4 * 12000000 / 1024, 158 [1] = 4 * 12000000 / 128, 159 [2] = 4 * 12000000 / 16, 160 [3] = 4 * 12000000 / 2, 161 [7] = 4 * 12000000, 162 }; 163 164 static const struct usb_devno uchcom_devs[] = { 165 { USB_VENDOR_QINHENG2, USB_PRODUCT_QINHENG2_CH341SER }, 166 { USB_VENDOR_QINHENG, USB_PRODUCT_QINHENG_CH340 }, 167 { USB_VENDOR_QINHENG, USB_PRODUCT_QINHENG_CH341_ASP }, 168 }; 169 #define uchcom_lookup(v, p) usb_lookup(uchcom_devs, v, p) 170 171 static void uchcom_get_status(void *, int, u_char *, u_char *); 172 static void uchcom_set(void *, int, int, int); 173 static int uchcom_param(void *, int, struct termios *); 174 static int uchcom_open(void *, int); 175 static void uchcom_close(void *, int); 176 static void uchcom_intr(struct usbd_xfer *, void *, 177 usbd_status); 178 179 static int set_config(struct uchcom_softc *); 180 static int find_ifaces(struct uchcom_softc *, struct usbd_interface **); 181 static int find_endpoints(struct uchcom_softc *, 182 struct uchcom_endpoints *); 183 static void close_intr_pipe(struct uchcom_softc *); 184 185 186 static const struct ucom_methods uchcom_methods = { 187 .ucom_get_status = uchcom_get_status, 188 .ucom_set = uchcom_set, 189 .ucom_param = uchcom_param, 190 .ucom_open = uchcom_open, 191 .ucom_close = uchcom_close, 192 }; 193 194 static int uchcom_match(device_t, cfdata_t, void *); 195 static void uchcom_attach(device_t, device_t, void *); 196 static void uchcom_childdet(device_t, device_t); 197 static int uchcom_detach(device_t, int); 198 199 CFATTACH_DECL2_NEW(uchcom, 200 sizeof(struct uchcom_softc), 201 uchcom_match, 202 uchcom_attach, 203 uchcom_detach, 204 NULL, 205 NULL, 206 uchcom_childdet); 207 208 /* ---------------------------------------------------------------------- 209 * driver entry points 210 */ 211 212 static int 213 uchcom_match(device_t parent, cfdata_t match, void *aux) 214 { 215 struct usb_attach_arg *uaa = aux; 216 217 return (uchcom_lookup(uaa->uaa_vendor, uaa->uaa_product) != NULL ? 218 UMATCH_VENDOR_PRODUCT : UMATCH_NONE); 219 } 220 221 static void 222 uchcom_attach(device_t parent, device_t self, void *aux) 223 { 224 struct uchcom_softc *sc = device_private(self); 225 struct usb_attach_arg *uaa = aux; 226 struct usbd_device *dev = uaa->uaa_device; 227 char *devinfop; 228 struct uchcom_endpoints endpoints; 229 struct ucom_attach_args ucaa; 230 231 aprint_naive("\n"); 232 aprint_normal("\n"); 233 234 devinfop = usbd_devinfo_alloc(dev, 0); 235 aprint_normal_dev(self, "%s\n", devinfop); 236 usbd_devinfo_free(devinfop); 237 238 sc->sc_dev = self; 239 sc->sc_udev = dev; 240 sc->sc_dying = false; 241 sc->sc_dtr = sc->sc_rts = -1; 242 sc->sc_lsr = sc->sc_msr = 0; 243 244 DPRINTF(("\n\nuchcom attach: sc=%p\n", sc)); 245 246 if (set_config(sc)) 247 goto failed; 248 249 if (find_ifaces(sc, &sc->sc_iface)) 250 goto failed; 251 252 if (find_endpoints(sc, &endpoints)) 253 goto failed; 254 255 sc->sc_intr_endpoint = endpoints.ep_intr; 256 sc->sc_intr_size = endpoints.ep_intr_size; 257 258 /* setup ucom layer */ 259 ucaa.ucaa_portno = UCOM_UNK_PORTNO; 260 ucaa.ucaa_bulkin = endpoints.ep_bulkin; 261 ucaa.ucaa_bulkout = endpoints.ep_bulkout; 262 ucaa.ucaa_ibufsize = UCHCOMIBUFSIZE; 263 ucaa.ucaa_obufsize = UCHCOMOBUFSIZE; 264 ucaa.ucaa_ibufsizepad = UCHCOMIBUFSIZE; 265 ucaa.ucaa_opkthdrlen = 0; 266 ucaa.ucaa_device = dev; 267 ucaa.ucaa_iface = sc->sc_iface; 268 ucaa.ucaa_methods = &uchcom_methods; 269 ucaa.ucaa_arg = sc; 270 ucaa.ucaa_info = NULL; 271 272 usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev, sc->sc_dev); 273 274 sc->sc_subdev = config_found(self, &ucaa, ucomprint, 275 CFARGS(.submatch = ucomsubmatch)); 276 277 return; 278 279 failed: 280 sc->sc_dying = true; 281 return; 282 } 283 284 static void 285 uchcom_childdet(device_t self, device_t child) 286 { 287 struct uchcom_softc *sc = device_private(self); 288 289 KASSERT(sc->sc_subdev == child); 290 sc->sc_subdev = NULL; 291 } 292 293 static int 294 uchcom_detach(device_t self, int flags) 295 { 296 struct uchcom_softc *sc = device_private(self); 297 int rv = 0; 298 299 DPRINTF(("uchcom_detach: sc=%p flags=%d\n", sc, flags)); 300 301 close_intr_pipe(sc); 302 303 sc->sc_dying = true; 304 305 if (sc->sc_subdev != NULL) { 306 rv = config_detach(sc->sc_subdev, flags); 307 sc->sc_subdev = NULL; 308 } 309 310 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev); 311 312 return rv; 313 } 314 315 static int 316 set_config(struct uchcom_softc *sc) 317 { 318 usbd_status err; 319 320 err = usbd_set_config_index(sc->sc_udev, UCHCOM_CONFIG_INDEX, 1); 321 if (err) { 322 aprint_error_dev(sc->sc_dev, 323 "failed to set configuration: %s\n", usbd_errstr(err)); 324 return -1; 325 } 326 327 return 0; 328 } 329 330 static int 331 find_ifaces(struct uchcom_softc *sc, struct usbd_interface **riface) 332 { 333 usbd_status err; 334 335 err = usbd_device2interface_handle(sc->sc_udev, UCHCOM_IFACE_INDEX, 336 riface); 337 if (err) { 338 aprint_error("\n%s: failed to get interface: %s\n", 339 device_xname(sc->sc_dev), usbd_errstr(err)); 340 return -1; 341 } 342 343 return 0; 344 } 345 346 static int 347 find_endpoints(struct uchcom_softc *sc, struct uchcom_endpoints *endpoints) 348 { 349 int i, bin=-1, bout=-1, intr=-1, isize=0; 350 usb_interface_descriptor_t *id; 351 usb_endpoint_descriptor_t *ed; 352 353 id = usbd_get_interface_descriptor(sc->sc_iface); 354 355 for (i = 0; i < id->bNumEndpoints; i++) { 356 ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i); 357 if (ed == NULL) { 358 aprint_error_dev(sc->sc_dev, 359 "no endpoint descriptor for %d\n", i); 360 return -1; 361 } 362 363 if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 364 UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) { 365 intr = ed->bEndpointAddress; 366 isize = UGETW(ed->wMaxPacketSize); 367 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 368 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 369 bin = ed->bEndpointAddress; 370 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT && 371 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 372 bout = ed->bEndpointAddress; 373 } 374 } 375 376 if (intr == -1 || bin == -1 || bout == -1) { 377 if (intr == -1) { 378 aprint_error_dev(sc->sc_dev, 379 "no interrupt end point\n"); 380 } 381 if (bin == -1) { 382 aprint_error_dev(sc->sc_dev, 383 "no data bulk in end point\n"); 384 } 385 if (bout == -1) { 386 aprint_error_dev(sc->sc_dev, 387 "no data bulk out end point\n"); 388 } 389 return -1; 390 } 391 if (isize < UCHCOM_INTR_LEAST) { 392 aprint_error_dev(sc->sc_dev, "intr pipe is too short\n"); 393 return -1; 394 } 395 396 DPRINTF(("%s: bulkin=%d, bulkout=%d, intr=%d, isize=%d\n", 397 device_xname(sc->sc_dev), bin, bout, intr, isize)); 398 399 endpoints->ep_intr = intr; 400 endpoints->ep_intr_size = isize; 401 endpoints->ep_bulkin = bin; 402 endpoints->ep_bulkout = bout; 403 404 return 0; 405 } 406 407 408 /* ---------------------------------------------------------------------- 409 * low level i/o 410 */ 411 412 static __inline usbd_status 413 generic_control_out(struct uchcom_softc *sc, uint8_t reqno, 414 uint16_t value, uint16_t index) 415 { 416 usb_device_request_t req; 417 418 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 419 req.bRequest = reqno; 420 USETW(req.wValue, value); 421 USETW(req.wIndex, index); 422 USETW(req.wLength, 0); 423 424 return usbd_do_request(sc->sc_udev, &req, 0); 425 } 426 427 static __inline usbd_status 428 generic_control_in(struct uchcom_softc *sc, uint8_t reqno, 429 uint16_t value, uint16_t index, void *buf, int buflen, 430 int *actlen) 431 { 432 usb_device_request_t req; 433 434 req.bmRequestType = UT_READ_VENDOR_DEVICE; 435 req.bRequest = reqno; 436 USETW(req.wValue, value); 437 USETW(req.wIndex, index); 438 USETW(req.wLength, (uint16_t)buflen); 439 440 return usbd_do_request_flags(sc->sc_udev, &req, buf, 441 USBD_SHORT_XFER_OK, actlen, 442 USBD_DEFAULT_TIMEOUT); 443 } 444 445 static __inline usbd_status 446 write_reg(struct uchcom_softc *sc, 447 uint8_t reg1, uint8_t val1, uint8_t reg2, uint8_t val2) 448 { 449 DPRINTF(("%s: write reg 0x%02X<-0x%02X, 0x%02X<-0x%02X\n", 450 device_xname(sc->sc_dev), 451 (unsigned)reg1, (unsigned)val1, 452 (unsigned)reg2, (unsigned)val2)); 453 return generic_control_out( 454 sc, UCHCOM_REQ_WRITE_REG, 455 reg1|((uint16_t)reg2<<8), val1|((uint16_t)val2<<8)); 456 } 457 458 static __inline usbd_status 459 read_reg(struct uchcom_softc *sc, 460 uint8_t reg1, uint8_t *rval1, uint8_t reg2, uint8_t *rval2) 461 { 462 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 463 usbd_status err; 464 int actin; 465 466 err = generic_control_in( 467 sc, UCHCOM_REQ_READ_REG, 468 reg1|((uint16_t)reg2<<8), 0, buf, sizeof(buf), &actin); 469 if (err) 470 return err; 471 472 DPRINTF(("%s: read reg 0x%02X->0x%02X, 0x%02X->0x%02X\n", 473 device_xname(sc->sc_dev), 474 (unsigned)reg1, (unsigned)buf[0], 475 (unsigned)reg2, (unsigned)buf[1])); 476 477 if (rval1) *rval1 = buf[0]; 478 if (rval2) *rval2 = buf[1]; 479 480 return USBD_NORMAL_COMPLETION; 481 } 482 483 static __inline usbd_status 484 get_version(struct uchcom_softc *sc, uint8_t *rver) 485 { 486 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 487 usbd_status err; 488 int actin; 489 490 err = generic_control_in( 491 sc, UCHCOM_REQ_GET_VERSION, 0, 0, buf, sizeof(buf), &actin); 492 if (err) 493 return err; 494 495 if (rver) *rver = buf[0]; 496 497 return USBD_NORMAL_COMPLETION; 498 } 499 500 static __inline usbd_status 501 get_status(struct uchcom_softc *sc, uint8_t *rval) 502 { 503 return read_reg(sc, UCHCOM_REG_STAT1, rval, UCHCOM_REG_STAT2, NULL); 504 } 505 506 static __inline usbd_status 507 set_dtrrts_10(struct uchcom_softc *sc, uint8_t val) 508 { 509 return write_reg(sc, UCHCOM_REG_STAT1, val, UCHCOM_REG_STAT1, val); 510 } 511 512 static __inline usbd_status 513 set_dtrrts_20(struct uchcom_softc *sc, uint8_t val) 514 { 515 return generic_control_out(sc, UCHCOM_REQ_SET_DTRRTS, val, 0); 516 } 517 518 519 /* ---------------------------------------------------------------------- 520 * middle layer 521 */ 522 523 static int 524 update_version(struct uchcom_softc *sc) 525 { 526 usbd_status err; 527 528 err = get_version(sc, &sc->sc_version); 529 if (err) { 530 device_printf(sc->sc_dev, "cannot get version: %s\n", 531 usbd_errstr(err)); 532 return EIO; 533 } 534 DPRINTF(("%s: update_version %d\n", device_xname(sc->sc_dev), sc->sc_version)); 535 536 return 0; 537 } 538 539 static void 540 convert_status(struct uchcom_softc *sc, uint8_t cur) 541 { 542 sc->sc_dtr = !(cur & UCHCOM_DTR_MASK); 543 sc->sc_rts = !(cur & UCHCOM_RTS_MASK); 544 545 cur = ~cur & 0x0F; 546 sc->sc_msr = (cur << 4) | ((sc->sc_msr >> 4) ^ cur); 547 } 548 549 static int 550 update_status(struct uchcom_softc *sc) 551 { 552 usbd_status err; 553 uint8_t cur; 554 555 err = get_status(sc, &cur); 556 if (err) { 557 device_printf(sc->sc_dev, 558 "cannot update status: %s\n", usbd_errstr(err)); 559 return EIO; 560 } 561 convert_status(sc, cur); 562 563 return 0; 564 } 565 566 567 static int 568 set_dtrrts(struct uchcom_softc *sc, int dtr, int rts) 569 { 570 usbd_status err; 571 uint8_t val = 0; 572 573 if (dtr) val |= UCHCOM_DTR_MASK; 574 if (rts) val |= UCHCOM_RTS_MASK; 575 576 if (sc->sc_version < UCHCOM_VER_20) 577 err = set_dtrrts_10(sc, ~val); 578 else 579 err = set_dtrrts_20(sc, ~val); 580 581 if (err) { 582 device_printf(sc->sc_dev, "cannot set DTR/RTS: %s\n", 583 usbd_errstr(err)); 584 return EIO; 585 } 586 587 return 0; 588 } 589 590 static int 591 set_break(struct uchcom_softc *sc, int onoff) 592 { 593 usbd_status err; 594 uint8_t brk, lcr; 595 596 err = read_reg(sc, UCHCOM_REG_BREAK, &brk, UCHCOM_REG_LCR, &lcr); 597 if (err) 598 return EIO; 599 if (onoff) { 600 /* on - clear bits */ 601 brk &= ~UCHCOM_BREAK_MASK; 602 lcr &= ~UCHCOM_LCR_TXE; 603 } else { 604 /* off - set bits */ 605 brk |= UCHCOM_BREAK_MASK; 606 lcr |= UCHCOM_LCR_TXE; 607 } 608 err = write_reg(sc, UCHCOM_REG_BREAK, brk, UCHCOM_REG_LCR, lcr); 609 if (err) 610 return EIO; 611 612 return 0; 613 } 614 615 static int 616 calc_divider_settings(struct uchcom_divider *dp, uint32_t rate) 617 { 618 /* 619 * combined with rates4x[] defined above, this routine generates, 620 * 1200: prescale = 1/0x1, divisor = 178/0xb2 621 * 2400: prescale = 1/0x1, divisor = 217/0xd9 622 * 4800: prescale = 2/0x2, divisor = 100/0x64 623 * 9600: prescale = 2/0x2, divisor = 178/0xb2 624 * 19200: prescale = 2/0x2, divisor = 217/0xd9 625 * 38400: prescale = 3/0x3, divisor = 100/0x64 626 * 57600: prescale = 2/0x2, divisor = 243/0xf3 627 * 115200: prescale = 3/0x3, divisor = 204/0xcc 628 * 921600: prescale = 7/0x7, divisor = 243/0xf3 629 * 500000: prescale = 3/0x3, divisor = 244/0xf4 630 * 1000000: prescale = 3/0x3, divisor = 250/0xfa 631 * 1500000: prescale = 3/0x3, divisor = 252/0xfc 632 * 2000000: prescale = 3/0x3, divisor = 253/0xfd 633 * 2500000: unsupported 634 * 3000000: prescale = 3/0x3, divisor = 254/0xfe 635 */ 636 size_t i; 637 uint32_t best, div, pre; 638 const uint32_t rate4x = rate * 4U; 639 640 if (rate == 0 || rate > 3000000) 641 return -1; 642 643 pre = __arraycount(rates4x); 644 best = UINT32_MAX; 645 646 for (i = 0; i < __arraycount(rates4x); i++) { 647 uint32_t score, try; 648 try = rates4x[i] * 2 / rate4x; 649 try = (try / 2) + (try & 1); 650 if (try < 2) 651 continue; 652 if (try > 255) 653 try = 255; 654 score = abs((int)rate4x - rates4x[i] / try); 655 if (score < best) { 656 best = score; 657 pre = i; 658 div = try; 659 } 660 } 661 662 if (pre >= __arraycount(rates4x)) 663 return -1; 664 if ((rates4x[pre] / div / 4) < (rate * 99 / 100)) 665 return -1; 666 if ((rates4x[pre] / div / 4) > (rate * 101 / 100)) 667 return -1; 668 669 dp->dv_prescaler = pre; 670 dp->dv_div = 256 - div; 671 672 return 0; 673 } 674 675 static int 676 set_dte_rate(struct uchcom_softc *sc, uint32_t rate) 677 { 678 usbd_status err; 679 struct uchcom_divider dv; 680 681 if (calc_divider_settings(&dv, rate)) 682 return EINVAL; 683 684 if ((err = write_reg(sc, 685 UCHCOM_REG_BPS_PRE, 686 dv.dv_prescaler | UCHCOM_BPS_PRE_IMM, 687 UCHCOM_REG_BPS_DIV, dv.dv_div))) { 688 device_printf(sc->sc_dev, "cannot set DTE rate: %s\n", 689 usbd_errstr(err)); 690 return EIO; 691 } 692 693 return 0; 694 } 695 696 static int 697 set_line_control(struct uchcom_softc *sc, tcflag_t cflag) 698 { 699 usbd_status err; 700 uint8_t lcr = 0, lcr2 = 0; 701 702 err = read_reg(sc, UCHCOM_REG_LCR, &lcr, UCHCOM_REG_LCR2, &lcr2); 703 if (err) { 704 device_printf(sc->sc_dev, "cannot get LCR: %s\n", 705 usbd_errstr(err)); 706 return EIO; 707 } 708 709 lcr = UCHCOM_LCR_RXE | UCHCOM_LCR_TXE; 710 711 switch (ISSET(cflag, CSIZE)) { 712 case CS5: 713 lcr |= UCHCOM_LCR_CS5; 714 break; 715 case CS6: 716 lcr |= UCHCOM_LCR_CS6; 717 break; 718 case CS7: 719 lcr |= UCHCOM_LCR_CS7; 720 break; 721 case CS8: 722 lcr |= UCHCOM_LCR_CS8; 723 break; 724 } 725 726 if (ISSET(cflag, PARENB)) { 727 lcr |= UCHCOM_LCR_PARENB; 728 if (!ISSET(cflag, PARODD)) 729 lcr |= UCHCOM_LCR_PAREVEN; 730 } 731 732 if (ISSET(cflag, CSTOPB)) { 733 lcr |= UCHCOM_LCR_STOPB; 734 } 735 736 err = write_reg(sc, UCHCOM_REG_LCR, lcr, UCHCOM_REG_LCR2, lcr2); 737 if (err) { 738 device_printf(sc->sc_dev, "cannot set LCR: %s\n", 739 usbd_errstr(err)); 740 return EIO; 741 } 742 743 return 0; 744 } 745 746 static int 747 clear_chip(struct uchcom_softc *sc) 748 { 749 usbd_status err; 750 751 DPRINTF(("%s: clear\n", device_xname(sc->sc_dev))); 752 err = generic_control_out(sc, UCHCOM_REQ_RESET, 0, 0); 753 if (err) { 754 device_printf(sc->sc_dev, "cannot clear: %s\n", 755 usbd_errstr(err)); 756 return EIO; 757 } 758 /* 759 * this REQ_RESET call ends up with 760 * LCR=0xc0 (8N1) 761 * PRE=0x02, DIV=0xd9 (19200) 762 */ 763 return 0; 764 } 765 766 static int 767 setup_comm(struct uchcom_softc *sc) 768 { 769 int ret; 770 771 ret = update_version(sc); 772 if (ret) 773 return ret; 774 775 ret = clear_chip(sc); 776 if (ret) 777 return ret; 778 779 ret = set_dte_rate(sc, TTYDEF_SPEED); 780 if (ret) 781 return ret; 782 783 ret = set_line_control(sc, CS8); 784 if (ret) 785 return ret; 786 787 ret = update_status(sc); 788 if (ret) 789 return ret; 790 791 sc->sc_dtr = sc->sc_rts = 1; 792 ret = set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 793 if (ret) 794 return ret; 795 796 return 0; 797 } 798 799 static int 800 setup_intr_pipe(struct uchcom_softc *sc) 801 { 802 usbd_status err; 803 804 if (sc->sc_intr_endpoint != -1 && sc->sc_intr_pipe == NULL) { 805 sc->sc_intr_buf = kmem_alloc(sc->sc_intr_size, KM_SLEEP); 806 err = usbd_open_pipe_intr(sc->sc_iface, 807 sc->sc_intr_endpoint, 808 USBD_SHORT_XFER_OK, 809 &sc->sc_intr_pipe, sc, 810 sc->sc_intr_buf, 811 sc->sc_intr_size, 812 uchcom_intr, USBD_DEFAULT_INTERVAL); 813 if (err) { 814 device_printf(sc->sc_dev, 815 "cannot open interrupt pipe: %s\n", 816 usbd_errstr(err)); 817 return EIO; 818 } 819 } 820 return 0; 821 } 822 823 static void 824 close_intr_pipe(struct uchcom_softc *sc) 825 { 826 827 if (sc->sc_intr_pipe != NULL) { 828 usbd_abort_pipe(sc->sc_intr_pipe); 829 usbd_close_pipe(sc->sc_intr_pipe); 830 sc->sc_intr_pipe = NULL; 831 } 832 if (sc->sc_intr_buf != NULL) { 833 kmem_free(sc->sc_intr_buf, sc->sc_intr_size); 834 sc->sc_intr_buf = NULL; 835 } 836 } 837 838 839 /* ---------------------------------------------------------------------- 840 * methods for ucom 841 */ 842 static void 843 uchcom_get_status(void *arg, int portno, u_char *rlsr, u_char *rmsr) 844 { 845 struct uchcom_softc *sc = arg; 846 847 if (sc->sc_dying) 848 return; 849 850 *rlsr = sc->sc_lsr; 851 *rmsr = sc->sc_msr; 852 } 853 854 static void 855 uchcom_set(void *arg, int portno, int reg, int onoff) 856 { 857 struct uchcom_softc *sc = arg; 858 859 if (sc->sc_dying) 860 return; 861 862 switch (reg) { 863 case UCOM_SET_DTR: 864 sc->sc_dtr = !!onoff; 865 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 866 break; 867 case UCOM_SET_RTS: 868 sc->sc_rts = !!onoff; 869 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 870 break; 871 case UCOM_SET_BREAK: 872 set_break(sc, onoff); 873 break; 874 } 875 } 876 877 static int 878 uchcom_param(void *arg, int portno, struct termios *t) 879 { 880 struct uchcom_softc *sc = arg; 881 int ret; 882 883 if (sc->sc_dying) 884 return EIO; 885 886 ret = set_line_control(sc, t->c_cflag); 887 if (ret) 888 return ret; 889 890 ret = set_dte_rate(sc, t->c_ospeed); 891 if (ret) 892 return ret; 893 894 return 0; 895 } 896 897 static int 898 uchcom_open(void *arg, int portno) 899 { 900 int ret; 901 struct uchcom_softc *sc = arg; 902 903 if (sc->sc_dying) 904 return EIO; 905 906 ret = setup_intr_pipe(sc); 907 if (ret) 908 return ret; 909 910 ret = setup_comm(sc); 911 if (ret) 912 return ret; 913 914 return 0; 915 } 916 917 static void 918 uchcom_close(void *arg, int portno) 919 { 920 struct uchcom_softc *sc = arg; 921 922 if (sc->sc_dying) 923 return; 924 925 close_intr_pipe(sc); 926 } 927 928 929 /* ---------------------------------------------------------------------- 930 * callback when the modem status is changed. 931 */ 932 static void 933 uchcom_intr(struct usbd_xfer *xfer, void * priv, 934 usbd_status status) 935 { 936 struct uchcom_softc *sc = priv; 937 u_char *buf = sc->sc_intr_buf; 938 939 if (sc->sc_dying) 940 return; 941 942 if (status != USBD_NORMAL_COMPLETION) { 943 if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) 944 return; 945 946 DPRINTF(("%s: abnormal status: %s\n", 947 device_xname(sc->sc_dev), usbd_errstr(status))); 948 usbd_clear_endpoint_stall_async(sc->sc_intr_pipe); 949 return; 950 } 951 DPRINTF(("%s: intr: 0x%02X 0x%02X 0x%02X 0x%02X " 952 "0x%02X 0x%02X 0x%02X 0x%02X\n", 953 device_xname(sc->sc_dev), 954 (unsigned)buf[0], (unsigned)buf[1], 955 (unsigned)buf[2], (unsigned)buf[3], 956 (unsigned)buf[4], (unsigned)buf[5], 957 (unsigned)buf[6], (unsigned)buf[7])); 958 959 convert_status(sc, buf[UCHCOM_INTR_STAT1]); 960 ucom_status_change(device_private(sc->sc_subdev)); 961 } 962
Indexes created Sun Sep 21 14:09:52 GMT 2025