uchcom.c revision 1.14
1 /* $NetBSD: uchcom.c,v 1.14 2016/04/23 10:15:32 skrll 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 1.14 2016/04/23 10:15:32 skrll 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, 299 sc->sc_dev); 300 301 sc->sc_subdev = config_found_sm_loc(self, "ucombus", NULL, &ucaa, 302 ucomprint, ucomsubmatch); 303 304 return; 305 306 failed: 307 sc->sc_dying = 1; 308 return; 309 } 310 311 void 312 uchcom_childdet(device_t self, device_t child) 313 { 314 struct uchcom_softc *sc = device_private(self); 315 316 KASSERT(sc->sc_subdev == child); 317 sc->sc_subdev = NULL; 318 } 319 320 int 321 uchcom_detach(device_t self, int flags) 322 { 323 struct uchcom_softc *sc = device_private(self); 324 int rv = 0; 325 326 DPRINTF(("uchcom_detach: sc=%p flags=%d\n", sc, flags)); 327 328 close_intr_pipe(sc); 329 330 sc->sc_dying = 1; 331 332 if (sc->sc_subdev != NULL) 333 rv = config_detach(sc->sc_subdev, flags); 334 335 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, 336 sc->sc_dev); 337 338 return rv; 339 } 340 341 int 342 uchcom_activate(device_t self, enum devact act) 343 { 344 struct uchcom_softc *sc = device_private(self); 345 346 switch (act) { 347 case DVACT_DEACTIVATE: 348 close_intr_pipe(sc); 349 sc->sc_dying = 1; 350 return 0; 351 default: 352 return EOPNOTSUPP; 353 } 354 } 355 356 static int 357 set_config(struct uchcom_softc *sc) 358 { 359 usbd_status err; 360 361 err = usbd_set_config_index(sc->sc_udev, UCHCOM_CONFIG_INDEX, 1); 362 if (err) { 363 aprint_error_dev(sc->sc_dev, 364 "failed to set configuration: %s\n", usbd_errstr(err)); 365 return -1; 366 } 367 368 return 0; 369 } 370 371 static int 372 find_ifaces(struct uchcom_softc *sc, struct usbd_interface **riface) 373 { 374 usbd_status err; 375 376 err = usbd_device2interface_handle(sc->sc_udev, UCHCOM_IFACE_INDEX, 377 riface); 378 if (err) { 379 aprint_error("\n%s: failed to get interface: %s\n", 380 device_xname(sc->sc_dev), usbd_errstr(err)); 381 return -1; 382 } 383 384 return 0; 385 } 386 387 static int 388 find_endpoints(struct uchcom_softc *sc, struct uchcom_endpoints *endpoints) 389 { 390 int i, bin=-1, bout=-1, intr=-1, isize=0; 391 usb_interface_descriptor_t *id; 392 usb_endpoint_descriptor_t *ed; 393 394 id = usbd_get_interface_descriptor(sc->sc_iface); 395 396 for (i = 0; i < id->bNumEndpoints; i++) { 397 ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i); 398 if (ed == NULL) { 399 aprint_error_dev(sc->sc_dev, 400 "no endpoint descriptor for %d\n", i); 401 return -1; 402 } 403 404 if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 405 UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) { 406 intr = ed->bEndpointAddress; 407 isize = UGETW(ed->wMaxPacketSize); 408 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 409 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 410 bin = ed->bEndpointAddress; 411 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT && 412 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 413 bout = ed->bEndpointAddress; 414 } 415 } 416 417 if (intr == -1 || bin == -1 || bout == -1) { 418 if (intr == -1) { 419 aprint_error_dev(sc->sc_dev, 420 "no interrupt end point\n"); 421 } 422 if (bin == -1) { 423 aprint_error_dev(sc->sc_dev, 424 "no data bulk in end point\n"); 425 } 426 if (bout == -1) { 427 aprint_error_dev(sc->sc_dev, 428 "no data bulk out end point\n"); 429 } 430 return -1; 431 } 432 if (isize < UCHCOM_INTR_LEAST) { 433 aprint_error_dev(sc->sc_dev, "intr pipe is too short\n"); 434 return -1; 435 } 436 437 DPRINTF(("%s: bulkin=%d, bulkout=%d, intr=%d, isize=%d\n", 438 device_xname(sc->sc_dev), bin, bout, intr, isize)); 439 440 endpoints->ep_intr = intr; 441 endpoints->ep_intr_size = isize; 442 endpoints->ep_bulkin = bin; 443 endpoints->ep_bulkout = bout; 444 445 return 0; 446 } 447 448 449 /* ---------------------------------------------------------------------- 450 * low level i/o 451 */ 452 453 static __inline usbd_status 454 generic_control_out(struct uchcom_softc *sc, uint8_t reqno, 455 uint16_t value, uint16_t index) 456 { 457 usb_device_request_t req; 458 459 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 460 req.bRequest = reqno; 461 USETW(req.wValue, value); 462 USETW(req.wIndex, index); 463 USETW(req.wLength, 0); 464 465 return usbd_do_request(sc->sc_udev, &req, 0); 466 } 467 468 static __inline usbd_status 469 generic_control_in(struct uchcom_softc *sc, uint8_t reqno, 470 uint16_t value, uint16_t index, void *buf, int buflen, 471 int *actlen) 472 { 473 usb_device_request_t req; 474 475 req.bmRequestType = UT_READ_VENDOR_DEVICE; 476 req.bRequest = reqno; 477 USETW(req.wValue, value); 478 USETW(req.wIndex, index); 479 USETW(req.wLength, (uint16_t)buflen); 480 481 return usbd_do_request_flags(sc->sc_udev, &req, buf, 482 USBD_SHORT_XFER_OK, actlen, 483 USBD_DEFAULT_TIMEOUT); 484 } 485 486 static __inline usbd_status 487 write_reg(struct uchcom_softc *sc, 488 uint8_t reg1, uint8_t val1, uint8_t reg2, uint8_t val2) 489 { 490 DPRINTF(("uchcom: write reg 0x%02X<-0x%02X, 0x%02X<-0x%02X\n", 491 (unsigned)reg1, (unsigned)val1, 492 (unsigned)reg2, (unsigned)val2)); 493 return generic_control_out( 494 sc, UCHCOM_REQ_WRITE_REG, 495 reg1|((uint16_t)reg2<<8), val1|((uint16_t)val2<<8)); 496 } 497 498 static __inline usbd_status 499 read_reg(struct uchcom_softc *sc, 500 uint8_t reg1, uint8_t *rval1, uint8_t reg2, uint8_t *rval2) 501 { 502 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 503 usbd_status err; 504 int actin; 505 506 err = generic_control_in( 507 sc, UCHCOM_REQ_READ_REG, 508 reg1|((uint16_t)reg2<<8), 0, buf, sizeof(buf), &actin); 509 if (err) 510 return err; 511 512 DPRINTF(("uchcom: read reg 0x%02X->0x%02X, 0x%02X->0x%02X\n", 513 (unsigned)reg1, (unsigned)buf[0], 514 (unsigned)reg2, (unsigned)buf[1])); 515 516 if (rval1) *rval1 = buf[0]; 517 if (rval2) *rval2 = buf[1]; 518 519 return USBD_NORMAL_COMPLETION; 520 } 521 522 static __inline usbd_status 523 get_version(struct uchcom_softc *sc, uint8_t *rver) 524 { 525 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 526 usbd_status err; 527 int actin; 528 529 err = generic_control_in( 530 sc, UCHCOM_REQ_GET_VERSION, 0, 0, buf, sizeof(buf), &actin); 531 if (err) 532 return err; 533 534 if (rver) *rver = buf[0]; 535 536 return USBD_NORMAL_COMPLETION; 537 } 538 539 static __inline usbd_status 540 get_status(struct uchcom_softc *sc, uint8_t *rval) 541 { 542 return read_reg(sc, UCHCOM_REG_STAT1, rval, UCHCOM_REG_STAT2, NULL); 543 } 544 545 static __inline usbd_status 546 set_dtrrts_10(struct uchcom_softc *sc, uint8_t val) 547 { 548 return write_reg(sc, UCHCOM_REG_STAT1, val, UCHCOM_REG_STAT1, val); 549 } 550 551 static __inline usbd_status 552 set_dtrrts_20(struct uchcom_softc *sc, uint8_t val) 553 { 554 return generic_control_out(sc, UCHCOM_REQ_SET_DTRRTS, val, 0); 555 } 556 557 558 /* ---------------------------------------------------------------------- 559 * middle layer 560 */ 561 562 static int 563 update_version(struct uchcom_softc *sc) 564 { 565 usbd_status err; 566 567 err = get_version(sc, &sc->sc_version); 568 if (err) { 569 aprint_error_dev(sc->sc_dev, "cannot get version: %s\n", 570 usbd_errstr(err)); 571 return EIO; 572 } 573 574 return 0; 575 } 576 577 static void 578 convert_status(struct uchcom_softc *sc, uint8_t cur) 579 { 580 sc->sc_dtr = !(cur & UCHCOM_DTR_MASK); 581 sc->sc_rts = !(cur & UCHCOM_RTS_MASK); 582 583 cur = ~cur & 0x0F; 584 sc->sc_msr = (cur << 4) | ((sc->sc_msr >> 4) ^ cur); 585 } 586 587 static int 588 update_status(struct uchcom_softc *sc) 589 { 590 usbd_status err; 591 uint8_t cur; 592 593 err = get_status(sc, &cur); 594 if (err) { 595 aprint_error_dev(sc->sc_dev, 596 "cannot update status: %s\n", usbd_errstr(err)); 597 return EIO; 598 } 599 convert_status(sc, cur); 600 601 return 0; 602 } 603 604 605 static int 606 set_dtrrts(struct uchcom_softc *sc, int dtr, int rts) 607 { 608 usbd_status err; 609 uint8_t val = 0; 610 611 if (dtr) val |= UCHCOM_DTR_MASK; 612 if (rts) val |= UCHCOM_RTS_MASK; 613 614 if (sc->sc_version < UCHCOM_VER_20) 615 err = set_dtrrts_10(sc, ~val); 616 else 617 err = set_dtrrts_20(sc, ~val); 618 619 if (err) { 620 aprint_error_dev(sc->sc_dev, "cannot set DTR/RTS: %s\n", 621 usbd_errstr(err)); 622 return EIO; 623 } 624 625 return 0; 626 } 627 628 static int 629 set_break(struct uchcom_softc *sc, int onoff) 630 { 631 usbd_status err; 632 uint8_t brk1, brk2; 633 634 err = read_reg(sc, UCHCOM_REG_BREAK1, &brk1, UCHCOM_REG_BREAK2, &brk2); 635 if (err) 636 return EIO; 637 if (onoff) { 638 /* on - clear bits */ 639 brk1 &= ~UCHCOM_BRK1_MASK; 640 brk2 &= ~UCHCOM_BRK2_MASK; 641 } else { 642 /* off - set bits */ 643 brk1 |= UCHCOM_BRK1_MASK; 644 brk2 |= UCHCOM_BRK2_MASK; 645 } 646 err = write_reg(sc, UCHCOM_REG_BREAK1, brk1, UCHCOM_REG_BREAK2, brk2); 647 if (err) 648 return EIO; 649 650 return 0; 651 } 652 653 static int 654 calc_divider_settings(struct uchcom_divider *dp, uint32_t rate) 655 { 656 int i; 657 const struct uchcom_divider_record *rp; 658 uint32_t div, rem, mod; 659 660 /* find record */ 661 for (i=0; i<NUM_DIVIDERS; i++) { 662 if (dividers[i].dvr_high >= rate && 663 dividers[i].dvr_low <= rate) { 664 rp = ÷rs[i]; 665 goto found; 666 } 667 } 668 return -1; 669 670 found: 671 dp->dv_prescaler = rp->dvr_divider.dv_prescaler; 672 if (rp->dvr_base_clock == UCHCOM_BASE_UNKNOWN) 673 dp->dv_div = rp->dvr_divider.dv_div; 674 else { 675 div = rp->dvr_base_clock / rate; 676 rem = rp->dvr_base_clock % rate; 677 if (div==0 || div>=0xFF) 678 return -1; 679 if ((rem<<1) >= rate) 680 div += 1; 681 dp->dv_div = (uint8_t)-div; 682 } 683 684 mod = UCHCOM_BPS_MOD_BASE/rate + UCHCOM_BPS_MOD_BASE_OFS; 685 mod = mod + mod/2; 686 687 dp->dv_mod = mod / 0x100; 688 689 return 0; 690 } 691 692 static int 693 set_dte_rate(struct uchcom_softc *sc, uint32_t rate) 694 { 695 usbd_status err; 696 struct uchcom_divider dv; 697 698 if (calc_divider_settings(&dv, rate)) 699 return EINVAL; 700 701 if ((err = write_reg(sc, 702 UCHCOM_REG_BPS_PRE, dv.dv_prescaler, 703 UCHCOM_REG_BPS_DIV, dv.dv_div)) || 704 (err = write_reg(sc, 705 UCHCOM_REG_BPS_MOD, dv.dv_mod, 706 UCHCOM_REG_BPS_PAD, 0))) { 707 aprint_error_dev(sc->sc_dev, "cannot set DTE rate: %s\n", 708 usbd_errstr(err)); 709 return EIO; 710 } 711 712 return 0; 713 } 714 715 static int 716 set_line_control(struct uchcom_softc *sc, tcflag_t cflag) 717 { 718 usbd_status err; 719 uint8_t lcr1val = 0, lcr2val = 0; 720 721 err = read_reg(sc, UCHCOM_REG_LCR1, &lcr1val, UCHCOM_REG_LCR2, &lcr2val); 722 if (err) { 723 aprint_error_dev(sc->sc_dev, "cannot get LCR: %s\n", 724 usbd_errstr(err)); 725 return EIO; 726 } 727 728 lcr1val &= ~UCHCOM_LCR1_MASK; 729 lcr2val &= ~UCHCOM_LCR2_MASK; 730 731 /* 732 * XXX: it is difficult to handle the line control appropriately: 733 * - CS8, !CSTOPB and any parity mode seems ok, but 734 * - the chip doesn't have the function to calculate parity 735 * in !CS8 mode. 736 * - it is unclear that the chip supports CS5,6 mode. 737 * - it is unclear how to handle stop bits. 738 */ 739 740 switch (ISSET(cflag, CSIZE)) { 741 case CS5: 742 case CS6: 743 case CS7: 744 return EINVAL; 745 case CS8: 746 break; 747 } 748 749 if (ISSET(cflag, PARENB)) { 750 lcr1val |= UCHCOM_LCR1_PARENB; 751 if (ISSET(cflag, PARODD)) 752 lcr2val |= UCHCOM_LCR2_PARODD; 753 else 754 lcr2val |= UCHCOM_LCR2_PAREVEN; 755 } 756 757 err = write_reg(sc, UCHCOM_REG_LCR1, lcr1val, UCHCOM_REG_LCR2, lcr2val); 758 if (err) { 759 aprint_error_dev(sc->sc_dev, "cannot set LCR: %s\n", 760 usbd_errstr(err)); 761 return EIO; 762 } 763 764 return 0; 765 } 766 767 static int 768 clear_chip(struct uchcom_softc *sc) 769 { 770 usbd_status err; 771 772 DPRINTF(("%s: clear\n", device_xname(sc->sc_dev))); 773 err = generic_control_out(sc, UCHCOM_REQ_RESET, 0, 0); 774 if (err) { 775 aprint_error_dev(sc->sc_dev, "cannot clear: %s\n", 776 usbd_errstr(err)); 777 return EIO; 778 } 779 780 return 0; 781 } 782 783 static int 784 reset_chip(struct uchcom_softc *sc) 785 { 786 usbd_status err; 787 uint8_t lcr1val, lcr2val, pre, div, mod; 788 uint16_t val=0, idx=0; 789 790 err = read_reg(sc, UCHCOM_REG_LCR1, &lcr1val, UCHCOM_REG_LCR2, &lcr2val); 791 if (err) 792 goto failed; 793 794 err = read_reg(sc, UCHCOM_REG_BPS_PRE, &pre, UCHCOM_REG_BPS_DIV, &div); 795 if (err) 796 goto failed; 797 798 err = read_reg(sc, UCHCOM_REG_BPS_MOD, &mod, UCHCOM_REG_BPS_PAD, NULL); 799 if (err) 800 goto failed; 801 802 val |= (uint16_t)(lcr1val&0xF0) << 8; 803 val |= 0x01; 804 val |= (uint16_t)(lcr2val&0x0F) << 8; 805 val |= 0x02; 806 idx |= pre & 0x07; 807 val |= 0x04; 808 idx |= (uint16_t)div << 8; 809 val |= 0x08; 810 idx |= mod & 0xF8; 811 val |= 0x10; 812 813 DPRINTF(("%s: reset v=0x%04X, i=0x%04X\n", 814 device_xname(sc->sc_dev), val, idx)); 815 816 err = generic_control_out(sc, UCHCOM_REQ_RESET, val, idx); 817 if (err) 818 goto failed; 819 820 return 0; 821 822 failed: 823 printf("%s: cannot reset: %s\n", 824 device_xname(sc->sc_dev), usbd_errstr(err)); 825 return EIO; 826 } 827 828 static int 829 setup_comm(struct uchcom_softc *sc) 830 { 831 int ret; 832 833 ret = update_version(sc); 834 if (ret) 835 return ret; 836 837 ret = clear_chip(sc); 838 if (ret) 839 return ret; 840 841 ret = set_dte_rate(sc, TTYDEF_SPEED); 842 if (ret) 843 return ret; 844 845 ret = set_line_control(sc, CS8); 846 if (ret) 847 return ret; 848 849 ret = update_status(sc); 850 if (ret) 851 return ret; 852 853 ret = reset_chip(sc); 854 if (ret) 855 return ret; 856 857 ret = set_dte_rate(sc, TTYDEF_SPEED); /* XXX */ 858 if (ret) 859 return ret; 860 861 sc->sc_dtr = sc->sc_rts = 1; 862 ret = set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 863 if (ret) 864 return ret; 865 866 return 0; 867 } 868 869 static int 870 setup_intr_pipe(struct uchcom_softc *sc) 871 { 872 usbd_status err; 873 874 if (sc->sc_intr_endpoint != -1 && sc->sc_intr_pipe == NULL) { 875 sc->sc_intr_buf = kmem_alloc(sc->sc_intr_size, KM_SLEEP); 876 err = usbd_open_pipe_intr(sc->sc_iface, 877 sc->sc_intr_endpoint, 878 USBD_SHORT_XFER_OK, 879 &sc->sc_intr_pipe, sc, 880 sc->sc_intr_buf, 881 sc->sc_intr_size, 882 uchcom_intr, USBD_DEFAULT_INTERVAL); 883 if (err) { 884 aprint_error_dev(sc->sc_dev, 885 "cannot open interrupt pipe: %s\n", 886 usbd_errstr(err)); 887 return EIO; 888 } 889 } 890 return 0; 891 } 892 893 static void 894 close_intr_pipe(struct uchcom_softc *sc) 895 { 896 usbd_status err; 897 898 if (sc->sc_dying) 899 return; 900 901 if (sc->sc_intr_pipe != NULL) { 902 err = usbd_abort_pipe(sc->sc_intr_pipe); 903 if (err) 904 aprint_error_dev(sc->sc_dev, 905 "abort interrupt pipe failed: %s\n", 906 usbd_errstr(err)); 907 err = usbd_close_pipe(sc->sc_intr_pipe); 908 if (err) 909 aprint_error_dev(sc->sc_dev, 910 "close interrupt pipe failed: %s\n", 911 usbd_errstr(err)); 912 kmem_free(sc->sc_intr_buf, sc->sc_intr_size); 913 sc->sc_intr_pipe = NULL; 914 } 915 } 916 917 918 /* ---------------------------------------------------------------------- 919 * methods for ucom 920 */ 921 void 922 uchcom_get_status(void *arg, int portno, u_char *rlsr, u_char *rmsr) 923 { 924 struct uchcom_softc *sc = arg; 925 926 if (sc->sc_dying) 927 return; 928 929 *rlsr = sc->sc_lsr; 930 *rmsr = sc->sc_msr; 931 } 932 933 void 934 uchcom_set(void *arg, int portno, int reg, int onoff) 935 { 936 struct uchcom_softc *sc = arg; 937 938 if (sc->sc_dying) 939 return; 940 941 switch (reg) { 942 case UCOM_SET_DTR: 943 sc->sc_dtr = !!onoff; 944 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 945 break; 946 case UCOM_SET_RTS: 947 sc->sc_rts = !!onoff; 948 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 949 break; 950 case UCOM_SET_BREAK: 951 set_break(sc, onoff); 952 break; 953 } 954 } 955 956 int 957 uchcom_param(void *arg, int portno, struct termios *t) 958 { 959 struct uchcom_softc *sc = arg; 960 int ret; 961 962 if (sc->sc_dying) 963 return 0; 964 965 ret = set_line_control(sc, t->c_cflag); 966 if (ret) 967 return ret; 968 969 ret = set_dte_rate(sc, t->c_ospeed); 970 if (ret) 971 return ret; 972 973 return 0; 974 } 975 976 int 977 uchcom_open(void *arg, int portno) 978 { 979 int ret; 980 struct uchcom_softc *sc = arg; 981 982 if (sc->sc_dying) 983 return EIO; 984 985 ret = setup_intr_pipe(sc); 986 if (ret) 987 return ret; 988 989 ret = setup_comm(sc); 990 if (ret) 991 return ret; 992 993 return 0; 994 } 995 996 void 997 uchcom_close(void *arg, int portno) 998 { 999 struct uchcom_softc *sc = arg; 1000 1001 if (sc->sc_dying) 1002 return; 1003 1004 close_intr_pipe(sc); 1005 } 1006 1007 1008 /* ---------------------------------------------------------------------- 1009 * callback when the modem status is changed. 1010 */ 1011 void 1012 uchcom_intr(struct usbd_xfer *xfer, void * priv, 1013 usbd_status status) 1014 { 1015 struct uchcom_softc *sc = priv; 1016 u_char *buf = sc->sc_intr_buf; 1017 1018 if (sc->sc_dying) 1019 return; 1020 1021 if (status != USBD_NORMAL_COMPLETION) { 1022 if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) 1023 return; 1024 1025 DPRINTF(("%s: abnormal status: %s\n", 1026 device_xname(sc->sc_dev), usbd_errstr(status))); 1027 usbd_clear_endpoint_stall_async(sc->sc_intr_pipe); 1028 return; 1029 } 1030 DPRINTF(("%s: intr: 0x%02X 0x%02X 0x%02X 0x%02X " 1031 "0x%02X 0x%02X 0x%02X 0x%02X\n", 1032 device_xname(sc->sc_dev), 1033 (unsigned)buf[0], (unsigned)buf[1], 1034 (unsigned)buf[2], (unsigned)buf[3], 1035 (unsigned)buf[4], (unsigned)buf[5], 1036 (unsigned)buf[6], (unsigned)buf[7])); 1037 1038 convert_status(sc, buf[UCHCOM_INTR_STAT1]); 1039 ucom_status_change(device_private(sc->sc_subdev)); 1040 } 1041
Indexes created Mon Sep 22 21:09:42 GMT 2025