uchcom.c revision 1.37.2.1
1 /* $NetBSD: uchcom.c,v 1.37.2.1 2021/08/01 22:42:32 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 1.37.2.1 2021/08/01 22:42:32 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 CFARG_SUBMATCH, ucomsubmatch, 276 CFARG_EOL); 277 278 return; 279 280 failed: 281 sc->sc_dying = true; 282 return; 283 } 284 285 static void 286 uchcom_childdet(device_t self, device_t child) 287 { 288 struct uchcom_softc *sc = device_private(self); 289 290 KASSERT(sc->sc_subdev == child); 291 sc->sc_subdev = NULL; 292 } 293 294 static int 295 uchcom_detach(device_t self, int flags) 296 { 297 struct uchcom_softc *sc = device_private(self); 298 int rv = 0; 299 300 DPRINTF(("uchcom_detach: sc=%p flags=%d\n", sc, flags)); 301 302 close_intr_pipe(sc); 303 304 sc->sc_dying = true; 305 306 if (sc->sc_subdev != NULL) { 307 rv = config_detach(sc->sc_subdev, flags); 308 sc->sc_subdev = NULL; 309 } 310 311 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev); 312 313 return rv; 314 } 315 316 static int 317 set_config(struct uchcom_softc *sc) 318 { 319 usbd_status err; 320 321 err = usbd_set_config_index(sc->sc_udev, UCHCOM_CONFIG_INDEX, 1); 322 if (err) { 323 aprint_error_dev(sc->sc_dev, 324 "failed to set configuration: %s\n", usbd_errstr(err)); 325 return -1; 326 } 327 328 return 0; 329 } 330 331 static int 332 find_ifaces(struct uchcom_softc *sc, struct usbd_interface **riface) 333 { 334 usbd_status err; 335 336 err = usbd_device2interface_handle(sc->sc_udev, UCHCOM_IFACE_INDEX, 337 riface); 338 if (err) { 339 aprint_error("\n%s: failed to get interface: %s\n", 340 device_xname(sc->sc_dev), usbd_errstr(err)); 341 return -1; 342 } 343 344 return 0; 345 } 346 347 static int 348 find_endpoints(struct uchcom_softc *sc, struct uchcom_endpoints *endpoints) 349 { 350 int i, bin=-1, bout=-1, intr=-1, isize=0; 351 usb_interface_descriptor_t *id; 352 usb_endpoint_descriptor_t *ed; 353 354 id = usbd_get_interface_descriptor(sc->sc_iface); 355 356 for (i = 0; i < id->bNumEndpoints; i++) { 357 ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i); 358 if (ed == NULL) { 359 aprint_error_dev(sc->sc_dev, 360 "no endpoint descriptor for %d\n", i); 361 return -1; 362 } 363 364 if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 365 UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) { 366 intr = ed->bEndpointAddress; 367 isize = UGETW(ed->wMaxPacketSize); 368 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 369 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 370 bin = ed->bEndpointAddress; 371 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT && 372 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 373 bout = ed->bEndpointAddress; 374 } 375 } 376 377 if (intr == -1 || bin == -1 || bout == -1) { 378 if (intr == -1) { 379 aprint_error_dev(sc->sc_dev, 380 "no interrupt end point\n"); 381 } 382 if (bin == -1) { 383 aprint_error_dev(sc->sc_dev, 384 "no data bulk in end point\n"); 385 } 386 if (bout == -1) { 387 aprint_error_dev(sc->sc_dev, 388 "no data bulk out end point\n"); 389 } 390 return -1; 391 } 392 if (isize < UCHCOM_INTR_LEAST) { 393 aprint_error_dev(sc->sc_dev, "intr pipe is too short\n"); 394 return -1; 395 } 396 397 DPRINTF(("%s: bulkin=%d, bulkout=%d, intr=%d, isize=%d\n", 398 device_xname(sc->sc_dev), bin, bout, intr, isize)); 399 400 endpoints->ep_intr = intr; 401 endpoints->ep_intr_size = isize; 402 endpoints->ep_bulkin = bin; 403 endpoints->ep_bulkout = bout; 404 405 return 0; 406 } 407 408 409 /* ---------------------------------------------------------------------- 410 * low level i/o 411 */ 412 413 static __inline usbd_status 414 generic_control_out(struct uchcom_softc *sc, uint8_t reqno, 415 uint16_t value, uint16_t index) 416 { 417 usb_device_request_t req; 418 419 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 420 req.bRequest = reqno; 421 USETW(req.wValue, value); 422 USETW(req.wIndex, index); 423 USETW(req.wLength, 0); 424 425 return usbd_do_request(sc->sc_udev, &req, 0); 426 } 427 428 static __inline usbd_status 429 generic_control_in(struct uchcom_softc *sc, uint8_t reqno, 430 uint16_t value, uint16_t index, void *buf, int buflen, 431 int *actlen) 432 { 433 usb_device_request_t req; 434 435 req.bmRequestType = UT_READ_VENDOR_DEVICE; 436 req.bRequest = reqno; 437 USETW(req.wValue, value); 438 USETW(req.wIndex, index); 439 USETW(req.wLength, (uint16_t)buflen); 440 441 return usbd_do_request_flags(sc->sc_udev, &req, buf, 442 USBD_SHORT_XFER_OK, actlen, 443 USBD_DEFAULT_TIMEOUT); 444 } 445 446 static __inline usbd_status 447 write_reg(struct uchcom_softc *sc, 448 uint8_t reg1, uint8_t val1, uint8_t reg2, uint8_t val2) 449 { 450 DPRINTF(("%s: write reg 0x%02X<-0x%02X, 0x%02X<-0x%02X\n", 451 device_xname(sc->sc_dev), 452 (unsigned)reg1, (unsigned)val1, 453 (unsigned)reg2, (unsigned)val2)); 454 return generic_control_out( 455 sc, UCHCOM_REQ_WRITE_REG, 456 reg1|((uint16_t)reg2<<8), val1|((uint16_t)val2<<8)); 457 } 458 459 static __inline usbd_status 460 read_reg(struct uchcom_softc *sc, 461 uint8_t reg1, uint8_t *rval1, uint8_t reg2, uint8_t *rval2) 462 { 463 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 464 usbd_status err; 465 int actin; 466 467 err = generic_control_in( 468 sc, UCHCOM_REQ_READ_REG, 469 reg1|((uint16_t)reg2<<8), 0, buf, sizeof(buf), &actin); 470 if (err) 471 return err; 472 473 DPRINTF(("%s: read reg 0x%02X->0x%02X, 0x%02X->0x%02X\n", 474 device_xname(sc->sc_dev), 475 (unsigned)reg1, (unsigned)buf[0], 476 (unsigned)reg2, (unsigned)buf[1])); 477 478 if (rval1) *rval1 = buf[0]; 479 if (rval2) *rval2 = buf[1]; 480 481 return USBD_NORMAL_COMPLETION; 482 } 483 484 static __inline usbd_status 485 get_version(struct uchcom_softc *sc, uint8_t *rver) 486 { 487 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 488 usbd_status err; 489 int actin; 490 491 err = generic_control_in( 492 sc, UCHCOM_REQ_GET_VERSION, 0, 0, buf, sizeof(buf), &actin); 493 if (err) 494 return err; 495 496 if (rver) *rver = buf[0]; 497 498 return USBD_NORMAL_COMPLETION; 499 } 500 501 static __inline usbd_status 502 get_status(struct uchcom_softc *sc, uint8_t *rval) 503 { 504 return read_reg(sc, UCHCOM_REG_STAT1, rval, UCHCOM_REG_STAT2, NULL); 505 } 506 507 static __inline usbd_status 508 set_dtrrts_10(struct uchcom_softc *sc, uint8_t val) 509 { 510 return write_reg(sc, UCHCOM_REG_STAT1, val, UCHCOM_REG_STAT1, val); 511 } 512 513 static __inline usbd_status 514 set_dtrrts_20(struct uchcom_softc *sc, uint8_t val) 515 { 516 return generic_control_out(sc, UCHCOM_REQ_SET_DTRRTS, val, 0); 517 } 518 519 520 /* ---------------------------------------------------------------------- 521 * middle layer 522 */ 523 524 static int 525 update_version(struct uchcom_softc *sc) 526 { 527 usbd_status err; 528 529 err = get_version(sc, &sc->sc_version); 530 if (err) { 531 device_printf(sc->sc_dev, "cannot get version: %s\n", 532 usbd_errstr(err)); 533 return EIO; 534 } 535 DPRINTF(("%s: update_version %d\n", device_xname(sc->sc_dev), sc->sc_version)); 536 537 return 0; 538 } 539 540 static void 541 convert_status(struct uchcom_softc *sc, uint8_t cur) 542 { 543 sc->sc_dtr = !(cur & UCHCOM_DTR_MASK); 544 sc->sc_rts = !(cur & UCHCOM_RTS_MASK); 545 546 cur = ~cur & 0x0F; 547 sc->sc_msr = (cur << 4) | ((sc->sc_msr >> 4) ^ cur); 548 } 549 550 static int 551 update_status(struct uchcom_softc *sc) 552 { 553 usbd_status err; 554 uint8_t cur; 555 556 err = get_status(sc, &cur); 557 if (err) { 558 device_printf(sc->sc_dev, 559 "cannot update status: %s\n", usbd_errstr(err)); 560 return EIO; 561 } 562 convert_status(sc, cur); 563 564 return 0; 565 } 566 567 568 static int 569 set_dtrrts(struct uchcom_softc *sc, int dtr, int rts) 570 { 571 usbd_status err; 572 uint8_t val = 0; 573 574 if (dtr) val |= UCHCOM_DTR_MASK; 575 if (rts) val |= UCHCOM_RTS_MASK; 576 577 if (sc->sc_version < UCHCOM_VER_20) 578 err = set_dtrrts_10(sc, ~val); 579 else 580 err = set_dtrrts_20(sc, ~val); 581 582 if (err) { 583 device_printf(sc->sc_dev, "cannot set DTR/RTS: %s\n", 584 usbd_errstr(err)); 585 return EIO; 586 } 587 588 return 0; 589 } 590 591 static int 592 set_break(struct uchcom_softc *sc, int onoff) 593 { 594 usbd_status err; 595 uint8_t brk, lcr; 596 597 err = read_reg(sc, UCHCOM_REG_BREAK, &brk, UCHCOM_REG_LCR, &lcr); 598 if (err) 599 return EIO; 600 if (onoff) { 601 /* on - clear bits */ 602 brk &= ~UCHCOM_BREAK_MASK; 603 lcr &= ~UCHCOM_LCR_TXE; 604 } else { 605 /* off - set bits */ 606 brk |= UCHCOM_BREAK_MASK; 607 lcr |= UCHCOM_LCR_TXE; 608 } 609 err = write_reg(sc, UCHCOM_REG_BREAK, brk, UCHCOM_REG_LCR, lcr); 610 if (err) 611 return EIO; 612 613 return 0; 614 } 615 616 static int 617 calc_divider_settings(struct uchcom_divider *dp, uint32_t rate) 618 { 619 /* 620 * combined with rates4x[] defined above, this routine generates, 621 * 1200: prescale = 1/0x1, divisor = 178/0xb2 622 * 2400: prescale = 1/0x1, divisor = 217/0xd9 623 * 4800: prescale = 2/0x2, divisor = 100/0x64 624 * 9600: prescale = 2/0x2, divisor = 178/0xb2 625 * 19200: prescale = 2/0x2, divisor = 217/0xd9 626 * 38400: prescale = 3/0x3, divisor = 100/0x64 627 * 57600: prescale = 2/0x2, divisor = 243/0xf3 628 * 115200: prescale = 3/0x3, divisor = 204/0xcc 629 * 921600: prescale = 7/0x7, divisor = 243/0xf3 630 * 500000: prescale = 3/0x3, divisor = 244/0xf4 631 * 1000000: prescale = 3/0x3, divisor = 250/0xfa 632 * 1500000: prescale = 3/0x3, divisor = 252/0xfc 633 * 2000000: prescale = 3/0x3, divisor = 253/0xfd 634 * 2500000: unsupported 635 * 3000000: prescale = 3/0x3, divisor = 254/0xfe 636 */ 637 size_t i; 638 uint32_t best, div, pre; 639 const uint32_t rate4x = rate * 4U; 640 641 if (rate == 0 || rate > 3000000) 642 return -1; 643 644 pre = __arraycount(rates4x); 645 best = UINT32_MAX; 646 647 for (i = 0; i < __arraycount(rates4x); i++) { 648 uint32_t score, try; 649 try = rates4x[i] * 2 / rate4x; 650 try = (try / 2) + (try & 1); 651 if (try < 2) 652 continue; 653 if (try > 255) 654 try = 255; 655 score = abs((int)rate4x - rates4x[i] / try); 656 if (score < best) { 657 best = score; 658 pre = i; 659 div = try; 660 } 661 } 662 663 if (pre >= __arraycount(rates4x)) 664 return -1; 665 if ((rates4x[pre] / div / 4) < (rate * 99 / 100)) 666 return -1; 667 if ((rates4x[pre] / div / 4) > (rate * 101 / 100)) 668 return -1; 669 670 dp->dv_prescaler = pre; 671 dp->dv_div = 256 - div; 672 673 return 0; 674 } 675 676 static int 677 set_dte_rate(struct uchcom_softc *sc, uint32_t rate) 678 { 679 usbd_status err; 680 struct uchcom_divider dv; 681 682 if (calc_divider_settings(&dv, rate)) 683 return EINVAL; 684 685 if ((err = write_reg(sc, 686 UCHCOM_REG_BPS_PRE, 687 dv.dv_prescaler | UCHCOM_BPS_PRE_IMM, 688 UCHCOM_REG_BPS_DIV, dv.dv_div))) { 689 device_printf(sc->sc_dev, "cannot set DTE rate: %s\n", 690 usbd_errstr(err)); 691 return EIO; 692 } 693 694 return 0; 695 } 696 697 static int 698 set_line_control(struct uchcom_softc *sc, tcflag_t cflag) 699 { 700 usbd_status err; 701 uint8_t lcr = 0, lcr2 = 0; 702 703 err = read_reg(sc, UCHCOM_REG_LCR, &lcr, UCHCOM_REG_LCR2, &lcr2); 704 if (err) { 705 device_printf(sc->sc_dev, "cannot get LCR: %s\n", 706 usbd_errstr(err)); 707 return EIO; 708 } 709 710 lcr = UCHCOM_LCR_RXE | UCHCOM_LCR_TXE; 711 712 switch (ISSET(cflag, CSIZE)) { 713 case CS5: 714 lcr |= UCHCOM_LCR_CS5; 715 break; 716 case CS6: 717 lcr |= UCHCOM_LCR_CS6; 718 break; 719 case CS7: 720 lcr |= UCHCOM_LCR_CS7; 721 break; 722 case CS8: 723 lcr |= UCHCOM_LCR_CS8; 724 break; 725 } 726 727 if (ISSET(cflag, PARENB)) { 728 lcr |= UCHCOM_LCR_PARENB; 729 if (!ISSET(cflag, PARODD)) 730 lcr |= UCHCOM_LCR_PAREVEN; 731 } 732 733 if (ISSET(cflag, CSTOPB)) { 734 lcr |= UCHCOM_LCR_STOPB; 735 } 736 737 err = write_reg(sc, UCHCOM_REG_LCR, lcr, UCHCOM_REG_LCR2, lcr2); 738 if (err) { 739 device_printf(sc->sc_dev, "cannot set LCR: %s\n", 740 usbd_errstr(err)); 741 return EIO; 742 } 743 744 return 0; 745 } 746 747 static int 748 clear_chip(struct uchcom_softc *sc) 749 { 750 usbd_status err; 751 752 DPRINTF(("%s: clear\n", device_xname(sc->sc_dev))); 753 err = generic_control_out(sc, UCHCOM_REQ_RESET, 0, 0); 754 if (err) { 755 device_printf(sc->sc_dev, "cannot clear: %s\n", 756 usbd_errstr(err)); 757 return EIO; 758 } 759 /* 760 * this REQ_RESET call ends up with 761 * LCR=0xc0 (8N1) 762 * PRE=0x02, DIV=0xd9 (19200) 763 */ 764 return 0; 765 } 766 767 static int 768 setup_comm(struct uchcom_softc *sc) 769 { 770 int ret; 771 772 ret = update_version(sc); 773 if (ret) 774 return ret; 775 776 ret = clear_chip(sc); 777 if (ret) 778 return ret; 779 780 ret = set_dte_rate(sc, TTYDEF_SPEED); 781 if (ret) 782 return ret; 783 784 ret = set_line_control(sc, CS8); 785 if (ret) 786 return ret; 787 788 ret = update_status(sc); 789 if (ret) 790 return ret; 791 792 sc->sc_dtr = sc->sc_rts = 1; 793 ret = set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 794 if (ret) 795 return ret; 796 797 return 0; 798 } 799 800 static int 801 setup_intr_pipe(struct uchcom_softc *sc) 802 { 803 usbd_status err; 804 805 if (sc->sc_intr_endpoint != -1 && sc->sc_intr_pipe == NULL) { 806 sc->sc_intr_buf = kmem_alloc(sc->sc_intr_size, KM_SLEEP); 807 err = usbd_open_pipe_intr(sc->sc_iface, 808 sc->sc_intr_endpoint, 809 USBD_SHORT_XFER_OK, 810 &sc->sc_intr_pipe, sc, 811 sc->sc_intr_buf, 812 sc->sc_intr_size, 813 uchcom_intr, USBD_DEFAULT_INTERVAL); 814 if (err) { 815 device_printf(sc->sc_dev, 816 "cannot open interrupt pipe: %s\n", 817 usbd_errstr(err)); 818 return EIO; 819 } 820 } 821 return 0; 822 } 823 824 static void 825 close_intr_pipe(struct uchcom_softc *sc) 826 { 827 828 if (sc->sc_intr_pipe != NULL) { 829 usbd_abort_pipe(sc->sc_intr_pipe); 830 usbd_close_pipe(sc->sc_intr_pipe); 831 sc->sc_intr_pipe = NULL; 832 } 833 if (sc->sc_intr_buf != NULL) { 834 kmem_free(sc->sc_intr_buf, sc->sc_intr_size); 835 sc->sc_intr_buf = NULL; 836 } 837 } 838 839 840 /* ---------------------------------------------------------------------- 841 * methods for ucom 842 */ 843 static void 844 uchcom_get_status(void *arg, int portno, u_char *rlsr, u_char *rmsr) 845 { 846 struct uchcom_softc *sc = arg; 847 848 if (sc->sc_dying) 849 return; 850 851 *rlsr = sc->sc_lsr; 852 *rmsr = sc->sc_msr; 853 } 854 855 static void 856 uchcom_set(void *arg, int portno, int reg, int onoff) 857 { 858 struct uchcom_softc *sc = arg; 859 860 if (sc->sc_dying) 861 return; 862 863 switch (reg) { 864 case UCOM_SET_DTR: 865 sc->sc_dtr = !!onoff; 866 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 867 break; 868 case UCOM_SET_RTS: 869 sc->sc_rts = !!onoff; 870 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 871 break; 872 case UCOM_SET_BREAK: 873 set_break(sc, onoff); 874 break; 875 } 876 } 877 878 static int 879 uchcom_param(void *arg, int portno, struct termios *t) 880 { 881 struct uchcom_softc *sc = arg; 882 int ret; 883 884 if (sc->sc_dying) 885 return EIO; 886 887 ret = set_line_control(sc, t->c_cflag); 888 if (ret) 889 return ret; 890 891 ret = set_dte_rate(sc, t->c_ospeed); 892 if (ret) 893 return ret; 894 895 return 0; 896 } 897 898 static int 899 uchcom_open(void *arg, int portno) 900 { 901 int ret; 902 struct uchcom_softc *sc = arg; 903 904 if (sc->sc_dying) 905 return EIO; 906 907 ret = setup_intr_pipe(sc); 908 if (ret) 909 return ret; 910 911 ret = setup_comm(sc); 912 if (ret) 913 return ret; 914 915 return 0; 916 } 917 918 static void 919 uchcom_close(void *arg, int portno) 920 { 921 struct uchcom_softc *sc = arg; 922 923 if (sc->sc_dying) 924 return; 925 926 close_intr_pipe(sc); 927 } 928 929 930 /* ---------------------------------------------------------------------- 931 * callback when the modem status is changed. 932 */ 933 static void 934 uchcom_intr(struct usbd_xfer *xfer, void * priv, 935 usbd_status status) 936 { 937 struct uchcom_softc *sc = priv; 938 u_char *buf = sc->sc_intr_buf; 939 940 if (sc->sc_dying) 941 return; 942 943 if (status != USBD_NORMAL_COMPLETION) { 944 if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) 945 return; 946 947 DPRINTF(("%s: abnormal status: %s\n", 948 device_xname(sc->sc_dev), usbd_errstr(status))); 949 usbd_clear_endpoint_stall_async(sc->sc_intr_pipe); 950 return; 951 } 952 DPRINTF(("%s: intr: 0x%02X 0x%02X 0x%02X 0x%02X " 953 "0x%02X 0x%02X 0x%02X 0x%02X\n", 954 device_xname(sc->sc_dev), 955 (unsigned)buf[0], (unsigned)buf[1], 956 (unsigned)buf[2], (unsigned)buf[3], 957 (unsigned)buf[4], (unsigned)buf[5], 958 (unsigned)buf[6], (unsigned)buf[7])); 959 960 convert_status(sc, buf[UCHCOM_INTR_STAT1]); 961 ucom_status_change(device_private(sc->sc_subdev)); 962 } 963
Indexes created Sat Oct 11 08:10:02 GMT 2025