uchcom.c revision 1.15
1 /* $NetBSD: uchcom.c,v 1.15 2016/07/07 06:55:42 msaitoh 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 1.15 2016/07/07 06:55:42 msaitoh Exp $"); 34 35 /* 36 * driver for WinChipHead CH341/340, the worst USB-serial chip in the world. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/kmem.h> 43 #include <sys/ioctl.h> 44 #include <sys/conf.h> 45 #include <sys/tty.h> 46 #include <sys/file.h> 47 #include <sys/select.h> 48 #include <sys/proc.h> 49 #include <sys/device.h> 50 #include <sys/poll.h> 51 52 #include <dev/usb/usb.h> 53 #include <dev/usb/usbcdc.h> 54 55 #include <dev/usb/usbdi.h> 56 #include <dev/usb/usbdi_util.h> 57 #include <dev/usb/usbdevs.h> 58 #include <dev/usb/usb_quirks.h> 59 60 #include <dev/usb/ucomvar.h> 61 62 #ifdef UCHCOM_DEBUG 63 #define DPRINTFN(n, x) if (uchcomdebug > (n)) printf x 64 int uchcomdebug = 0; 65 #else 66 #define DPRINTFN(n, x) 67 #endif 68 #define DPRINTF(x) DPRINTFN(0, x) 69 70 #define UCHCOM_IFACE_INDEX 0 71 #define UCHCOM_CONFIG_INDEX 0 72 73 #define UCHCOM_REV_CH340 0x0250 74 #define UCHCOM_INPUT_BUF_SIZE 8 75 76 #define UCHCOM_REQ_GET_VERSION 0x5F 77 #define UCHCOM_REQ_READ_REG 0x95 78 #define UCHCOM_REQ_WRITE_REG 0x9A 79 #define UCHCOM_REQ_RESET 0xA1 80 #define UCHCOM_REQ_SET_DTRRTS 0xA4 81 82 #define UCHCOM_REG_STAT1 0x06 83 #define UCHCOM_REG_STAT2 0x07 84 #define UCHCOM_REG_BPS_PRE 0x12 85 #define UCHCOM_REG_BPS_DIV 0x13 86 #define UCHCOM_REG_BPS_MOD 0x14 87 #define UCHCOM_REG_BPS_PAD 0x0F 88 #define UCHCOM_REG_BREAK1 0x05 89 #define UCHCOM_REG_BREAK2 0x18 90 #define UCHCOM_REG_LCR1 0x18 91 #define UCHCOM_REG_LCR2 0x25 92 93 #define UCHCOM_VER_20 0x20 94 95 #define UCHCOM_BASE_UNKNOWN 0 96 #define UCHCOM_BPS_MOD_BASE 20000000 97 #define UCHCOM_BPS_MOD_BASE_OFS 1100 98 99 #define UCHCOM_DTR_MASK 0x20 100 #define UCHCOM_RTS_MASK 0x40 101 102 #define UCHCOM_BRK1_MASK 0x01 103 #define UCHCOM_BRK2_MASK 0x40 104 105 #define UCHCOM_LCR1_MASK 0xAF 106 #define UCHCOM_LCR2_MASK 0x07 107 #define UCHCOM_LCR1_PARENB 0x80 108 #define UCHCOM_LCR2_PAREVEN 0x07 109 #define UCHCOM_LCR2_PARODD 0x06 110 #define UCHCOM_LCR2_PARMARK 0x05 111 #define UCHCOM_LCR2_PARSPACE 0x04 112 113 #define UCHCOM_INTR_STAT1 0x02 114 #define UCHCOM_INTR_STAT2 0x03 115 #define UCHCOM_INTR_LEAST 4 116 117 #define UCHCOMIBUFSIZE 256 118 #define UCHCOMOBUFSIZE 256 119 120 struct uchcom_softc 121 { 122 device_t sc_dev; 123 struct usbd_device * sc_udev; 124 device_t sc_subdev; 125 struct usbd_interface * sc_iface; 126 int sc_dying; 127 /* */ 128 int sc_intr_endpoint; 129 int sc_intr_size; 130 struct usbd_pipe * sc_intr_pipe; 131 u_char *sc_intr_buf; 132 /* */ 133 uint8_t sc_version; 134 int sc_dtr; 135 int sc_rts; 136 u_char sc_lsr; 137 u_char sc_msr; 138 int sc_lcr1; 139 int sc_lcr2; 140 }; 141 142 struct uchcom_endpoints 143 { 144 int ep_bulkin; 145 int ep_bulkout; 146 int ep_intr; 147 int ep_intr_size; 148 }; 149 150 struct uchcom_divider 151 { 152 uint8_t dv_prescaler; 153 uint8_t dv_div; 154 uint8_t dv_mod; 155 }; 156 157 struct uchcom_divider_record 158 { 159 uint32_t dvr_high; 160 uint32_t dvr_low; 161 uint32_t dvr_base_clock; 162 struct uchcom_divider dvr_divider; 163 }; 164 165 static const struct uchcom_divider_record dividers[] = 166 { 167 { 307200, 307200, UCHCOM_BASE_UNKNOWN, { 7, 0xD9, 0 } }, 168 { 921600, 921600, UCHCOM_BASE_UNKNOWN, { 7, 0xF3, 0 } }, 169 { 2999999, 23530, 6000000, { 3, 0, 0 } }, 170 { 23529, 2942, 750000, { 2, 0, 0 } }, 171 { 2941, 368, 93750, { 1, 0, 0 } }, 172 { 367, 1, 11719, { 0, 0, 0 } }, 173 }; 174 #define NUM_DIVIDERS (sizeof (dividers) / sizeof (dividers[0])) 175 176 static const struct usb_devno uchcom_devs[] = { 177 { USB_VENDOR_WINCHIPHEAD, USB_PRODUCT_WINCHIPHEAD_CH341SER }, 178 { USB_VENDOR_WINCHIPHEAD2, USB_PRODUCT_WINCHIPHEAD2_CH341 }, 179 }; 180 #define uchcom_lookup(v, p) usb_lookup(uchcom_devs, v, p) 181 182 Static void uchcom_get_status(void *, int, u_char *, u_char *); 183 Static void uchcom_set(void *, int, int, int); 184 Static int uchcom_param(void *, int, struct termios *); 185 Static int uchcom_open(void *, int); 186 Static void uchcom_close(void *, int); 187 Static void uchcom_intr(struct usbd_xfer *, void *, 188 usbd_status); 189 190 static int set_config(struct uchcom_softc *); 191 static int find_ifaces(struct uchcom_softc *, struct usbd_interface **); 192 static int find_endpoints(struct uchcom_softc *, 193 struct uchcom_endpoints *); 194 static void close_intr_pipe(struct uchcom_softc *); 195 196 197 struct ucom_methods uchcom_methods = { 198 .ucom_get_status = uchcom_get_status, 199 .ucom_set = uchcom_set, 200 .ucom_param = uchcom_param, 201 .ucom_ioctl = NULL, 202 .ucom_open = uchcom_open, 203 .ucom_close = uchcom_close, 204 .ucom_read = NULL, 205 .ucom_write = NULL, 206 }; 207 208 int uchcom_match(device_t, cfdata_t, void *); 209 void uchcom_attach(device_t, device_t, void *); 210 void uchcom_childdet(device_t, device_t); 211 int uchcom_detach(device_t, int); 212 int uchcom_activate(device_t, enum devact); 213 214 extern struct cfdriver uchcom_cd; 215 216 CFATTACH_DECL2_NEW(uchcom, 217 sizeof(struct uchcom_softc), 218 uchcom_match, 219 uchcom_attach, 220 uchcom_detach, 221 uchcom_activate, 222 NULL, 223 uchcom_childdet); 224 225 /* ---------------------------------------------------------------------- 226 * driver entry points 227 */ 228 229 int 230 uchcom_match(device_t parent, cfdata_t match, void *aux) 231 { 232 struct usb_attach_arg *uaa = aux; 233 234 return (uchcom_lookup(uaa->uaa_vendor, uaa->uaa_product) != NULL ? 235 UMATCH_VENDOR_PRODUCT : UMATCH_NONE); 236 } 237 238 void 239 uchcom_attach(device_t parent, device_t self, void *aux) 240 { 241 struct uchcom_softc *sc = device_private(self); 242 struct usb_attach_arg *uaa = aux; 243 struct usbd_device *dev = uaa->uaa_device; 244 char *devinfop; 245 struct uchcom_endpoints endpoints; 246 struct ucom_attach_args ucaa; 247 248 aprint_naive("\n"); 249 aprint_normal("\n"); 250 251 devinfop = usbd_devinfo_alloc(dev, 0); 252 aprint_normal_dev(self, "%s\n", devinfop); 253 usbd_devinfo_free(devinfop); 254 255 sc->sc_dev = self; 256 sc->sc_udev = dev; 257 sc->sc_dying = 0; 258 sc->sc_dtr = sc->sc_rts = -1; 259 sc->sc_lsr = sc->sc_msr = 0; 260 261 DPRINTF(("\n\nuchcom attach: sc=%p\n", sc)); 262 263 if (set_config(sc)) 264 goto failed; 265 266 switch (uaa->uaa_release) { 267 case UCHCOM_REV_CH340: 268 aprint_normal_dev(self, "CH340 detected\n"); 269 break; 270 default: 271 aprint_normal_dev(self, "CH341 detected\n"); 272 break; 273 } 274 275 if (find_ifaces(sc, &sc->sc_iface)) 276 goto failed; 277 278 if (find_endpoints(sc, &endpoints)) 279 goto failed; 280 281 sc->sc_intr_endpoint = endpoints.ep_intr; 282 sc->sc_intr_size = endpoints.ep_intr_size; 283 284 /* setup ucom layer */ 285 ucaa.ucaa_portno = UCOM_UNK_PORTNO; 286 ucaa.ucaa_bulkin = endpoints.ep_bulkin; 287 ucaa.ucaa_bulkout = endpoints.ep_bulkout; 288 ucaa.ucaa_ibufsize = UCHCOMIBUFSIZE; 289 ucaa.ucaa_obufsize = UCHCOMOBUFSIZE; 290 ucaa.ucaa_ibufsizepad = UCHCOMIBUFSIZE; 291 ucaa.ucaa_opkthdrlen = 0; 292 ucaa.ucaa_device = dev; 293 ucaa.ucaa_iface = sc->sc_iface; 294 ucaa.ucaa_methods = &uchcom_methods; 295 ucaa.ucaa_arg = sc; 296 ucaa.ucaa_info = NULL; 297 298 usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev, sc->sc_dev); 299 300 sc->sc_subdev = config_found_sm_loc(self, "ucombus", NULL, &ucaa, 301 ucomprint, ucomsubmatch); 302 303 return; 304 305 failed: 306 sc->sc_dying = 1; 307 return; 308 } 309 310 void 311 uchcom_childdet(device_t self, device_t child) 312 { 313 struct uchcom_softc *sc = device_private(self); 314 315 KASSERT(sc->sc_subdev == child); 316 sc->sc_subdev = NULL; 317 } 318 319 int 320 uchcom_detach(device_t self, int flags) 321 { 322 struct uchcom_softc *sc = device_private(self); 323 int rv = 0; 324 325 DPRINTF(("uchcom_detach: sc=%p flags=%d\n", sc, flags)); 326 327 close_intr_pipe(sc); 328 329 sc->sc_dying = 1; 330 331 if (sc->sc_subdev != NULL) 332 rv = config_detach(sc->sc_subdev, flags); 333 334 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev); 335 336 return rv; 337 } 338 339 int 340 uchcom_activate(device_t self, enum devact act) 341 { 342 struct uchcom_softc *sc = device_private(self); 343 344 switch (act) { 345 case DVACT_DEACTIVATE: 346 close_intr_pipe(sc); 347 sc->sc_dying = 1; 348 return 0; 349 default: 350 return EOPNOTSUPP; 351 } 352 } 353 354 static int 355 set_config(struct uchcom_softc *sc) 356 { 357 usbd_status err; 358 359 err = usbd_set_config_index(sc->sc_udev, UCHCOM_CONFIG_INDEX, 1); 360 if (err) { 361 aprint_error_dev(sc->sc_dev, 362 "failed to set configuration: %s\n", usbd_errstr(err)); 363 return -1; 364 } 365 366 return 0; 367 } 368 369 static int 370 find_ifaces(struct uchcom_softc *sc, struct usbd_interface **riface) 371 { 372 usbd_status err; 373 374 err = usbd_device2interface_handle(sc->sc_udev, UCHCOM_IFACE_INDEX, 375 riface); 376 if (err) { 377 aprint_error("\n%s: failed to get interface: %s\n", 378 device_xname(sc->sc_dev), usbd_errstr(err)); 379 return -1; 380 } 381 382 return 0; 383 } 384 385 static int 386 find_endpoints(struct uchcom_softc *sc, struct uchcom_endpoints *endpoints) 387 { 388 int i, bin=-1, bout=-1, intr=-1, isize=0; 389 usb_interface_descriptor_t *id; 390 usb_endpoint_descriptor_t *ed; 391 392 id = usbd_get_interface_descriptor(sc->sc_iface); 393 394 for (i = 0; i < id->bNumEndpoints; i++) { 395 ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i); 396 if (ed == NULL) { 397 aprint_error_dev(sc->sc_dev, 398 "no endpoint descriptor for %d\n", i); 399 return -1; 400 } 401 402 if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 403 UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) { 404 intr = ed->bEndpointAddress; 405 isize = UGETW(ed->wMaxPacketSize); 406 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 407 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 408 bin = ed->bEndpointAddress; 409 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT && 410 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 411 bout = ed->bEndpointAddress; 412 } 413 } 414 415 if (intr == -1 || bin == -1 || bout == -1) { 416 if (intr == -1) { 417 aprint_error_dev(sc->sc_dev, 418 "no interrupt end point\n"); 419 } 420 if (bin == -1) { 421 aprint_error_dev(sc->sc_dev, 422 "no data bulk in end point\n"); 423 } 424 if (bout == -1) { 425 aprint_error_dev(sc->sc_dev, 426 "no data bulk out end point\n"); 427 } 428 return -1; 429 } 430 if (isize < UCHCOM_INTR_LEAST) { 431 aprint_error_dev(sc->sc_dev, "intr pipe is too short\n"); 432 return -1; 433 } 434 435 DPRINTF(("%s: bulkin=%d, bulkout=%d, intr=%d, isize=%d\n", 436 device_xname(sc->sc_dev), bin, bout, intr, isize)); 437 438 endpoints->ep_intr = intr; 439 endpoints->ep_intr_size = isize; 440 endpoints->ep_bulkin = bin; 441 endpoints->ep_bulkout = bout; 442 443 return 0; 444 } 445 446 447 /* ---------------------------------------------------------------------- 448 * low level i/o 449 */ 450 451 static __inline usbd_status 452 generic_control_out(struct uchcom_softc *sc, uint8_t reqno, 453 uint16_t value, uint16_t index) 454 { 455 usb_device_request_t req; 456 457 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 458 req.bRequest = reqno; 459 USETW(req.wValue, value); 460 USETW(req.wIndex, index); 461 USETW(req.wLength, 0); 462 463 return usbd_do_request(sc->sc_udev, &req, 0); 464 } 465 466 static __inline usbd_status 467 generic_control_in(struct uchcom_softc *sc, uint8_t reqno, 468 uint16_t value, uint16_t index, void *buf, int buflen, 469 int *actlen) 470 { 471 usb_device_request_t req; 472 473 req.bmRequestType = UT_READ_VENDOR_DEVICE; 474 req.bRequest = reqno; 475 USETW(req.wValue, value); 476 USETW(req.wIndex, index); 477 USETW(req.wLength, (uint16_t)buflen); 478 479 return usbd_do_request_flags(sc->sc_udev, &req, buf, 480 USBD_SHORT_XFER_OK, actlen, 481 USBD_DEFAULT_TIMEOUT); 482 } 483 484 static __inline usbd_status 485 write_reg(struct uchcom_softc *sc, 486 uint8_t reg1, uint8_t val1, uint8_t reg2, uint8_t val2) 487 { 488 DPRINTF(("uchcom: write reg 0x%02X<-0x%02X, 0x%02X<-0x%02X\n", 489 (unsigned)reg1, (unsigned)val1, 490 (unsigned)reg2, (unsigned)val2)); 491 return generic_control_out( 492 sc, UCHCOM_REQ_WRITE_REG, 493 reg1|((uint16_t)reg2<<8), val1|((uint16_t)val2<<8)); 494 } 495 496 static __inline usbd_status 497 read_reg(struct uchcom_softc *sc, 498 uint8_t reg1, uint8_t *rval1, uint8_t reg2, uint8_t *rval2) 499 { 500 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 501 usbd_status err; 502 int actin; 503 504 err = generic_control_in( 505 sc, UCHCOM_REQ_READ_REG, 506 reg1|((uint16_t)reg2<<8), 0, buf, sizeof(buf), &actin); 507 if (err) 508 return err; 509 510 DPRINTF(("uchcom: read reg 0x%02X->0x%02X, 0x%02X->0x%02X\n", 511 (unsigned)reg1, (unsigned)buf[0], 512 (unsigned)reg2, (unsigned)buf[1])); 513 514 if (rval1) *rval1 = buf[0]; 515 if (rval2) *rval2 = buf[1]; 516 517 return USBD_NORMAL_COMPLETION; 518 } 519 520 static __inline usbd_status 521 get_version(struct uchcom_softc *sc, uint8_t *rver) 522 { 523 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 524 usbd_status err; 525 int actin; 526 527 err = generic_control_in( 528 sc, UCHCOM_REQ_GET_VERSION, 0, 0, buf, sizeof(buf), &actin); 529 if (err) 530 return err; 531 532 if (rver) *rver = buf[0]; 533 534 return USBD_NORMAL_COMPLETION; 535 } 536 537 static __inline usbd_status 538 get_status(struct uchcom_softc *sc, uint8_t *rval) 539 { 540 return read_reg(sc, UCHCOM_REG_STAT1, rval, UCHCOM_REG_STAT2, NULL); 541 } 542 543 static __inline usbd_status 544 set_dtrrts_10(struct uchcom_softc *sc, uint8_t val) 545 { 546 return write_reg(sc, UCHCOM_REG_STAT1, val, UCHCOM_REG_STAT1, val); 547 } 548 549 static __inline usbd_status 550 set_dtrrts_20(struct uchcom_softc *sc, uint8_t val) 551 { 552 return generic_control_out(sc, UCHCOM_REQ_SET_DTRRTS, val, 0); 553 } 554 555 556 /* ---------------------------------------------------------------------- 557 * middle layer 558 */ 559 560 static int 561 update_version(struct uchcom_softc *sc) 562 { 563 usbd_status err; 564 565 err = get_version(sc, &sc->sc_version); 566 if (err) { 567 aprint_error_dev(sc->sc_dev, "cannot get version: %s\n", 568 usbd_errstr(err)); 569 return EIO; 570 } 571 572 return 0; 573 } 574 575 static void 576 convert_status(struct uchcom_softc *sc, uint8_t cur) 577 { 578 sc->sc_dtr = !(cur & UCHCOM_DTR_MASK); 579 sc->sc_rts = !(cur & UCHCOM_RTS_MASK); 580 581 cur = ~cur & 0x0F; 582 sc->sc_msr = (cur << 4) | ((sc->sc_msr >> 4) ^ cur); 583 } 584 585 static int 586 update_status(struct uchcom_softc *sc) 587 { 588 usbd_status err; 589 uint8_t cur; 590 591 err = get_status(sc, &cur); 592 if (err) { 593 aprint_error_dev(sc->sc_dev, 594 "cannot update status: %s\n", usbd_errstr(err)); 595 return EIO; 596 } 597 convert_status(sc, cur); 598 599 return 0; 600 } 601 602 603 static int 604 set_dtrrts(struct uchcom_softc *sc, int dtr, int rts) 605 { 606 usbd_status err; 607 uint8_t val = 0; 608 609 if (dtr) val |= UCHCOM_DTR_MASK; 610 if (rts) val |= UCHCOM_RTS_MASK; 611 612 if (sc->sc_version < UCHCOM_VER_20) 613 err = set_dtrrts_10(sc, ~val); 614 else 615 err = set_dtrrts_20(sc, ~val); 616 617 if (err) { 618 aprint_error_dev(sc->sc_dev, "cannot set DTR/RTS: %s\n", 619 usbd_errstr(err)); 620 return EIO; 621 } 622 623 return 0; 624 } 625 626 static int 627 set_break(struct uchcom_softc *sc, int onoff) 628 { 629 usbd_status err; 630 uint8_t brk1, brk2; 631 632 err = read_reg(sc, UCHCOM_REG_BREAK1, &brk1, UCHCOM_REG_BREAK2, &brk2); 633 if (err) 634 return EIO; 635 if (onoff) { 636 /* on - clear bits */ 637 brk1 &= ~UCHCOM_BRK1_MASK; 638 brk2 &= ~UCHCOM_BRK2_MASK; 639 } else { 640 /* off - set bits */ 641 brk1 |= UCHCOM_BRK1_MASK; 642 brk2 |= UCHCOM_BRK2_MASK; 643 } 644 err = write_reg(sc, UCHCOM_REG_BREAK1, brk1, UCHCOM_REG_BREAK2, brk2); 645 if (err) 646 return EIO; 647 648 return 0; 649 } 650 651 static int 652 calc_divider_settings(struct uchcom_divider *dp, uint32_t rate) 653 { 654 int i; 655 const struct uchcom_divider_record *rp; 656 uint32_t div, rem, mod; 657 658 /* find record */ 659 for (i=0; i<NUM_DIVIDERS; i++) { 660 if (dividers[i].dvr_high >= rate && 661 dividers[i].dvr_low <= rate) { 662 rp = ÷rs[i]; 663 goto found; 664 } 665 } 666 return -1; 667 668 found: 669 dp->dv_prescaler = rp->dvr_divider.dv_prescaler; 670 if (rp->dvr_base_clock == UCHCOM_BASE_UNKNOWN) 671 dp->dv_div = rp->dvr_divider.dv_div; 672 else { 673 div = rp->dvr_base_clock / rate; 674 rem = rp->dvr_base_clock % rate; 675 if (div==0 || div>=0xFF) 676 return -1; 677 if ((rem<<1) >= rate) 678 div += 1; 679 dp->dv_div = (uint8_t)-div; 680 } 681 682 mod = UCHCOM_BPS_MOD_BASE/rate + UCHCOM_BPS_MOD_BASE_OFS; 683 mod = mod + mod/2; 684 685 dp->dv_mod = mod / 0x100; 686 687 return 0; 688 } 689 690 static int 691 set_dte_rate(struct uchcom_softc *sc, uint32_t rate) 692 { 693 usbd_status err; 694 struct uchcom_divider dv; 695 696 if (calc_divider_settings(&dv, rate)) 697 return EINVAL; 698 699 if ((err = write_reg(sc, 700 UCHCOM_REG_BPS_PRE, dv.dv_prescaler, 701 UCHCOM_REG_BPS_DIV, dv.dv_div)) || 702 (err = write_reg(sc, 703 UCHCOM_REG_BPS_MOD, dv.dv_mod, 704 UCHCOM_REG_BPS_PAD, 0))) { 705 aprint_error_dev(sc->sc_dev, "cannot set DTE rate: %s\n", 706 usbd_errstr(err)); 707 return EIO; 708 } 709 710 return 0; 711 } 712 713 static int 714 set_line_control(struct uchcom_softc *sc, tcflag_t cflag) 715 { 716 usbd_status err; 717 uint8_t lcr1val = 0, lcr2val = 0; 718 719 err = read_reg(sc, UCHCOM_REG_LCR1, &lcr1val, UCHCOM_REG_LCR2, &lcr2val); 720 if (err) { 721 aprint_error_dev(sc->sc_dev, "cannot get LCR: %s\n", 722 usbd_errstr(err)); 723 return EIO; 724 } 725 726 lcr1val &= ~UCHCOM_LCR1_MASK; 727 lcr2val &= ~UCHCOM_LCR2_MASK; 728 729 /* 730 * XXX: it is difficult to handle the line control appropriately: 731 * - CS8, !CSTOPB and any parity mode seems ok, but 732 * - the chip doesn't have the function to calculate parity 733 * in !CS8 mode. 734 * - it is unclear that the chip supports CS5,6 mode. 735 * - it is unclear how to handle stop bits. 736 */ 737 738 switch (ISSET(cflag, CSIZE)) { 739 case CS5: 740 case CS6: 741 case CS7: 742 return EINVAL; 743 case CS8: 744 break; 745 } 746 747 if (ISSET(cflag, PARENB)) { 748 lcr1val |= UCHCOM_LCR1_PARENB; 749 if (ISSET(cflag, PARODD)) 750 lcr2val |= UCHCOM_LCR2_PARODD; 751 else 752 lcr2val |= UCHCOM_LCR2_PAREVEN; 753 } 754 755 err = write_reg(sc, UCHCOM_REG_LCR1, lcr1val, UCHCOM_REG_LCR2, lcr2val); 756 if (err) { 757 aprint_error_dev(sc->sc_dev, "cannot set LCR: %s\n", 758 usbd_errstr(err)); 759 return EIO; 760 } 761 762 return 0; 763 } 764 765 static int 766 clear_chip(struct uchcom_softc *sc) 767 { 768 usbd_status err; 769 770 DPRINTF(("%s: clear\n", device_xname(sc->sc_dev))); 771 err = generic_control_out(sc, UCHCOM_REQ_RESET, 0, 0); 772 if (err) { 773 aprint_error_dev(sc->sc_dev, "cannot clear: %s\n", 774 usbd_errstr(err)); 775 return EIO; 776 } 777 778 return 0; 779 } 780 781 static int 782 reset_chip(struct uchcom_softc *sc) 783 { 784 usbd_status err; 785 uint8_t lcr1val, lcr2val, pre, div, mod; 786 uint16_t val=0, idx=0; 787 788 err = read_reg(sc, UCHCOM_REG_LCR1, &lcr1val, UCHCOM_REG_LCR2, &lcr2val); 789 if (err) 790 goto failed; 791 792 err = read_reg(sc, UCHCOM_REG_BPS_PRE, &pre, UCHCOM_REG_BPS_DIV, &div); 793 if (err) 794 goto failed; 795 796 err = read_reg(sc, UCHCOM_REG_BPS_MOD, &mod, UCHCOM_REG_BPS_PAD, NULL); 797 if (err) 798 goto failed; 799 800 val |= (uint16_t)(lcr1val&0xF0) << 8; 801 val |= 0x01; 802 val |= (uint16_t)(lcr2val&0x0F) << 8; 803 val |= 0x02; 804 idx |= pre & 0x07; 805 val |= 0x04; 806 idx |= (uint16_t)div << 8; 807 val |= 0x08; 808 idx |= mod & 0xF8; 809 val |= 0x10; 810 811 DPRINTF(("%s: reset v=0x%04X, i=0x%04X\n", 812 device_xname(sc->sc_dev), val, idx)); 813 814 err = generic_control_out(sc, UCHCOM_REQ_RESET, val, idx); 815 if (err) 816 goto failed; 817 818 return 0; 819 820 failed: 821 printf("%s: cannot reset: %s\n", 822 device_xname(sc->sc_dev), usbd_errstr(err)); 823 return EIO; 824 } 825 826 static int 827 setup_comm(struct uchcom_softc *sc) 828 { 829 int ret; 830 831 ret = update_version(sc); 832 if (ret) 833 return ret; 834 835 ret = clear_chip(sc); 836 if (ret) 837 return ret; 838 839 ret = set_dte_rate(sc, TTYDEF_SPEED); 840 if (ret) 841 return ret; 842 843 ret = set_line_control(sc, CS8); 844 if (ret) 845 return ret; 846 847 ret = update_status(sc); 848 if (ret) 849 return ret; 850 851 ret = reset_chip(sc); 852 if (ret) 853 return ret; 854 855 ret = set_dte_rate(sc, TTYDEF_SPEED); /* XXX */ 856 if (ret) 857 return ret; 858 859 sc->sc_dtr = sc->sc_rts = 1; 860 ret = set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 861 if (ret) 862 return ret; 863 864 return 0; 865 } 866 867 static int 868 setup_intr_pipe(struct uchcom_softc *sc) 869 { 870 usbd_status err; 871 872 if (sc->sc_intr_endpoint != -1 && sc->sc_intr_pipe == NULL) { 873 sc->sc_intr_buf = kmem_alloc(sc->sc_intr_size, KM_SLEEP); 874 err = usbd_open_pipe_intr(sc->sc_iface, 875 sc->sc_intr_endpoint, 876 USBD_SHORT_XFER_OK, 877 &sc->sc_intr_pipe, sc, 878 sc->sc_intr_buf, 879 sc->sc_intr_size, 880 uchcom_intr, USBD_DEFAULT_INTERVAL); 881 if (err) { 882 aprint_error_dev(sc->sc_dev, 883 "cannot open interrupt pipe: %s\n", 884 usbd_errstr(err)); 885 return EIO; 886 } 887 } 888 return 0; 889 } 890 891 static void 892 close_intr_pipe(struct uchcom_softc *sc) 893 { 894 usbd_status err; 895 896 if (sc->sc_dying) 897 return; 898 899 if (sc->sc_intr_pipe != NULL) { 900 err = usbd_abort_pipe(sc->sc_intr_pipe); 901 if (err) 902 aprint_error_dev(sc->sc_dev, 903 "abort interrupt pipe failed: %s\n", 904 usbd_errstr(err)); 905 err = usbd_close_pipe(sc->sc_intr_pipe); 906 if (err) 907 aprint_error_dev(sc->sc_dev, 908 "close interrupt pipe failed: %s\n", 909 usbd_errstr(err)); 910 kmem_free(sc->sc_intr_buf, sc->sc_intr_size); 911 sc->sc_intr_pipe = NULL; 912 } 913 } 914 915 916 /* ---------------------------------------------------------------------- 917 * methods for ucom 918 */ 919 void 920 uchcom_get_status(void *arg, int portno, u_char *rlsr, u_char *rmsr) 921 { 922 struct uchcom_softc *sc = arg; 923 924 if (sc->sc_dying) 925 return; 926 927 *rlsr = sc->sc_lsr; 928 *rmsr = sc->sc_msr; 929 } 930 931 void 932 uchcom_set(void *arg, int portno, int reg, int onoff) 933 { 934 struct uchcom_softc *sc = arg; 935 936 if (sc->sc_dying) 937 return; 938 939 switch (reg) { 940 case UCOM_SET_DTR: 941 sc->sc_dtr = !!onoff; 942 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 943 break; 944 case UCOM_SET_RTS: 945 sc->sc_rts = !!onoff; 946 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 947 break; 948 case UCOM_SET_BREAK: 949 set_break(sc, onoff); 950 break; 951 } 952 } 953 954 int 955 uchcom_param(void *arg, int portno, struct termios *t) 956 { 957 struct uchcom_softc *sc = arg; 958 int ret; 959 960 if (sc->sc_dying) 961 return 0; 962 963 ret = set_line_control(sc, t->c_cflag); 964 if (ret) 965 return ret; 966 967 ret = set_dte_rate(sc, t->c_ospeed); 968 if (ret) 969 return ret; 970 971 return 0; 972 } 973 974 int 975 uchcom_open(void *arg, int portno) 976 { 977 int ret; 978 struct uchcom_softc *sc = arg; 979 980 if (sc->sc_dying) 981 return EIO; 982 983 ret = setup_intr_pipe(sc); 984 if (ret) 985 return ret; 986 987 ret = setup_comm(sc); 988 if (ret) 989 return ret; 990 991 return 0; 992 } 993 994 void 995 uchcom_close(void *arg, int portno) 996 { 997 struct uchcom_softc *sc = arg; 998 999 if (sc->sc_dying) 1000 return; 1001 1002 close_intr_pipe(sc); 1003 } 1004 1005 1006 /* ---------------------------------------------------------------------- 1007 * callback when the modem status is changed. 1008 */ 1009 void 1010 uchcom_intr(struct usbd_xfer *xfer, void * priv, 1011 usbd_status status) 1012 { 1013 struct uchcom_softc *sc = priv; 1014 u_char *buf = sc->sc_intr_buf; 1015 1016 if (sc->sc_dying) 1017 return; 1018 1019 if (status != USBD_NORMAL_COMPLETION) { 1020 if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) 1021 return; 1022 1023 DPRINTF(("%s: abnormal status: %s\n", 1024 device_xname(sc->sc_dev), usbd_errstr(status))); 1025 usbd_clear_endpoint_stall_async(sc->sc_intr_pipe); 1026 return; 1027 } 1028 DPRINTF(("%s: intr: 0x%02X 0x%02X 0x%02X 0x%02X " 1029 "0x%02X 0x%02X 0x%02X 0x%02X\n", 1030 device_xname(sc->sc_dev), 1031 (unsigned)buf[0], (unsigned)buf[1], 1032 (unsigned)buf[2], (unsigned)buf[3], 1033 (unsigned)buf[4], (unsigned)buf[5], 1034 (unsigned)buf[6], (unsigned)buf[7])); 1035 1036 convert_status(sc, buf[UCHCOM_INTR_STAT1]); 1037 ucom_status_change(device_private(sc->sc_subdev)); 1038 } 1039
Indexes created Wed Sep 24 02:09:48 GMT 2025