uchcom.c revision 1.18
1 /* $NetBSD: uchcom.c,v 1.18 2018/12/10 00:03:11 jakllsch 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 1.18 2018/12/10 00:03:11 jakllsch 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 #include <dev/usb/usbcdc.h> 58 59 #include <dev/usb/usbdi.h> 60 #include <dev/usb/usbdi_util.h> 61 #include <dev/usb/usbdevs.h> 62 #include <dev/usb/usb_quirks.h> 63 64 #include <dev/usb/ucomvar.h> 65 66 #ifdef UCHCOM_DEBUG 67 #define DPRINTFN(n, x) if (uchcomdebug > (n)) printf x 68 int uchcomdebug = 0; 69 #else 70 #define DPRINTFN(n, x) 71 #endif 72 #define DPRINTF(x) DPRINTFN(0, x) 73 74 #define UCHCOM_IFACE_INDEX 0 75 #define UCHCOM_CONFIG_INDEX 0 76 77 #define UCHCOM_REV_CH340 0x0250 78 #define UCHCOM_INPUT_BUF_SIZE 8 79 80 #define UCHCOM_REQ_GET_VERSION 0x5F 81 #define UCHCOM_REQ_READ_REG 0x95 82 #define UCHCOM_REQ_WRITE_REG 0x9A 83 #define UCHCOM_REQ_RESET 0xA1 84 #define UCHCOM_REQ_SET_DTRRTS 0xA4 85 86 #define UCHCOM_REG_STAT1 0x06 87 #define UCHCOM_REG_STAT2 0x07 88 #define UCHCOM_REG_BPS_PRE 0x12 89 #define UCHCOM_REG_BPS_DIV 0x13 90 #define UCHCOM_REG_BPS_MOD 0x14 91 #define UCHCOM_REG_BPS_PAD 0x0F 92 #define UCHCOM_REG_BREAK1 0x05 93 #define UCHCOM_REG_BREAK2 0x18 94 #define UCHCOM_REG_LCR1 0x18 95 #define UCHCOM_REG_LCR2 0x25 96 97 #define UCHCOM_VER_20 0x20 98 #define UCHCOM_VER_30 0x30 99 100 #define UCHCOM_BASE_UNKNOWN 0 101 #define UCHCOM_BPS_MOD_BASE 20000000 102 #define UCHCOM_BPS_MOD_BASE_OFS 1100 103 104 #define UCHCOM_DTR_MASK 0x20 105 #define UCHCOM_RTS_MASK 0x40 106 107 #define UCHCOM_BRK1_MASK 0x01 108 #define UCHCOM_BRK2_MASK 0x40 109 110 #define UCHCOM_LCR1_MASK 0xAF 111 #define UCHCOM_LCR2_MASK 0x07 112 #define UCHCOM_LCR1_PARENB 0x80 113 #define UCHCOM_LCR2_PAREVEN 0x07 114 #define UCHCOM_LCR2_PARODD 0x06 115 #define UCHCOM_LCR2_PARMARK 0x05 116 #define UCHCOM_LCR2_PARSPACE 0x04 117 118 #define UCHCOM_INTR_STAT1 0x02 119 #define UCHCOM_INTR_STAT2 0x03 120 #define UCHCOM_INTR_LEAST 4 121 122 #define UCHCOMIBUFSIZE 256 123 #define UCHCOMOBUFSIZE 256 124 125 struct uchcom_softc 126 { 127 device_t sc_dev; 128 struct usbd_device * sc_udev; 129 device_t sc_subdev; 130 struct usbd_interface * sc_iface; 131 int sc_dying; 132 /* */ 133 int sc_intr_endpoint; 134 int sc_intr_size; 135 struct usbd_pipe * sc_intr_pipe; 136 u_char *sc_intr_buf; 137 /* */ 138 uint8_t sc_version; 139 int sc_dtr; 140 int sc_rts; 141 u_char sc_lsr; 142 u_char sc_msr; 143 int sc_lcr1; 144 int sc_lcr2; 145 }; 146 147 struct uchcom_endpoints 148 { 149 int ep_bulkin; 150 int ep_bulkout; 151 int ep_intr; 152 int ep_intr_size; 153 }; 154 155 struct uchcom_divider 156 { 157 uint8_t dv_prescaler; 158 uint8_t dv_div; 159 uint8_t dv_mod; 160 }; 161 162 struct uchcom_divider_record 163 { 164 uint32_t dvr_high; 165 uint32_t dvr_low; 166 uint32_t dvr_base_clock; 167 struct uchcom_divider dvr_divider; 168 }; 169 170 static const struct uchcom_divider_record dividers[] = 171 { 172 { 307200, 307200, UCHCOM_BASE_UNKNOWN, { 7, 0xD9, 0 } }, 173 { 921600, 921600, UCHCOM_BASE_UNKNOWN, { 7, 0xF3, 0 } }, 174 { 2999999, 23530, 6000000, { 3, 0, 0 } }, 175 { 23529, 2942, 750000, { 2, 0, 0 } }, 176 { 2941, 368, 93750, { 1, 0, 0 } }, 177 { 367, 1, 11719, { 0, 0, 0 } }, 178 }; 179 #define NUM_DIVIDERS (sizeof (dividers) / sizeof (dividers[0])) 180 181 static const struct usb_devno uchcom_devs[] = { 182 { USB_VENDOR_WINCHIPHEAD, USB_PRODUCT_WINCHIPHEAD_CH341SER }, 183 { USB_VENDOR_WINCHIPHEAD2, USB_PRODUCT_WINCHIPHEAD2_CH341 }, 184 { USB_VENDOR_WINCHIPHEAD2, USB_PRODUCT_WINCHIPHEAD2_CH341_2 }, 185 }; 186 #define uchcom_lookup(v, p) usb_lookup(uchcom_devs, v, p) 187 188 Static void uchcom_get_status(void *, int, u_char *, u_char *); 189 Static void uchcom_set(void *, int, int, int); 190 Static int uchcom_param(void *, int, struct termios *); 191 Static int uchcom_open(void *, int); 192 Static void uchcom_close(void *, int); 193 Static void uchcom_intr(struct usbd_xfer *, void *, 194 usbd_status); 195 196 static int set_config(struct uchcom_softc *); 197 static int find_ifaces(struct uchcom_softc *, struct usbd_interface **); 198 static int find_endpoints(struct uchcom_softc *, 199 struct uchcom_endpoints *); 200 static void close_intr_pipe(struct uchcom_softc *); 201 202 203 struct ucom_methods uchcom_methods = { 204 .ucom_get_status = uchcom_get_status, 205 .ucom_set = uchcom_set, 206 .ucom_param = uchcom_param, 207 .ucom_ioctl = NULL, 208 .ucom_open = uchcom_open, 209 .ucom_close = uchcom_close, 210 .ucom_read = NULL, 211 .ucom_write = NULL, 212 }; 213 214 int uchcom_match(device_t, cfdata_t, void *); 215 void uchcom_attach(device_t, device_t, void *); 216 void uchcom_childdet(device_t, device_t); 217 int uchcom_detach(device_t, int); 218 int uchcom_activate(device_t, enum devact); 219 220 extern struct cfdriver uchcom_cd; 221 222 CFATTACH_DECL2_NEW(uchcom, 223 sizeof(struct uchcom_softc), 224 uchcom_match, 225 uchcom_attach, 226 uchcom_detach, 227 uchcom_activate, 228 NULL, 229 uchcom_childdet); 230 231 /* ---------------------------------------------------------------------- 232 * driver entry points 233 */ 234 235 int 236 uchcom_match(device_t parent, cfdata_t match, void *aux) 237 { 238 struct usb_attach_arg *uaa = aux; 239 240 return (uchcom_lookup(uaa->uaa_vendor, uaa->uaa_product) != NULL ? 241 UMATCH_VENDOR_PRODUCT : UMATCH_NONE); 242 } 243 244 void 245 uchcom_attach(device_t parent, device_t self, void *aux) 246 { 247 struct uchcom_softc *sc = device_private(self); 248 struct usb_attach_arg *uaa = aux; 249 struct usbd_device *dev = uaa->uaa_device; 250 char *devinfop; 251 struct uchcom_endpoints endpoints; 252 struct ucom_attach_args ucaa; 253 254 aprint_naive("\n"); 255 aprint_normal("\n"); 256 257 devinfop = usbd_devinfo_alloc(dev, 0); 258 aprint_normal_dev(self, "%s\n", devinfop); 259 usbd_devinfo_free(devinfop); 260 261 sc->sc_dev = self; 262 sc->sc_udev = dev; 263 sc->sc_dying = 0; 264 sc->sc_dtr = sc->sc_rts = -1; 265 sc->sc_lsr = sc->sc_msr = 0; 266 267 DPRINTF(("\n\nuchcom attach: sc=%p\n", sc)); 268 269 if (set_config(sc)) 270 goto failed; 271 272 switch (uaa->uaa_release) { 273 case UCHCOM_REV_CH340: 274 aprint_normal_dev(self, "CH340 detected\n"); 275 break; 276 default: 277 aprint_normal_dev(self, "CH341 detected\n"); 278 break; 279 } 280 281 if (find_ifaces(sc, &sc->sc_iface)) 282 goto failed; 283 284 if (find_endpoints(sc, &endpoints)) 285 goto failed; 286 287 sc->sc_intr_endpoint = endpoints.ep_intr; 288 sc->sc_intr_size = endpoints.ep_intr_size; 289 290 /* setup ucom layer */ 291 ucaa.ucaa_portno = UCOM_UNK_PORTNO; 292 ucaa.ucaa_bulkin = endpoints.ep_bulkin; 293 ucaa.ucaa_bulkout = endpoints.ep_bulkout; 294 ucaa.ucaa_ibufsize = UCHCOMIBUFSIZE; 295 ucaa.ucaa_obufsize = UCHCOMOBUFSIZE; 296 ucaa.ucaa_ibufsizepad = UCHCOMIBUFSIZE; 297 ucaa.ucaa_opkthdrlen = 0; 298 ucaa.ucaa_device = dev; 299 ucaa.ucaa_iface = sc->sc_iface; 300 ucaa.ucaa_methods = &uchcom_methods; 301 ucaa.ucaa_arg = sc; 302 ucaa.ucaa_info = NULL; 303 304 usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev, sc->sc_dev); 305 306 sc->sc_subdev = config_found_sm_loc(self, "ucombus", NULL, &ucaa, 307 ucomprint, ucomsubmatch); 308 309 return; 310 311 failed: 312 sc->sc_dying = 1; 313 return; 314 } 315 316 void 317 uchcom_childdet(device_t self, device_t child) 318 { 319 struct uchcom_softc *sc = device_private(self); 320 321 KASSERT(sc->sc_subdev == child); 322 sc->sc_subdev = NULL; 323 } 324 325 int 326 uchcom_detach(device_t self, int flags) 327 { 328 struct uchcom_softc *sc = device_private(self); 329 int rv = 0; 330 331 DPRINTF(("uchcom_detach: sc=%p flags=%d\n", sc, flags)); 332 333 close_intr_pipe(sc); 334 335 sc->sc_dying = 1; 336 337 if (sc->sc_subdev != NULL) 338 rv = config_detach(sc->sc_subdev, flags); 339 340 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev); 341 342 return rv; 343 } 344 345 int 346 uchcom_activate(device_t self, enum devact act) 347 { 348 struct uchcom_softc *sc = device_private(self); 349 350 switch (act) { 351 case DVACT_DEACTIVATE: 352 close_intr_pipe(sc); 353 sc->sc_dying = 1; 354 return 0; 355 default: 356 return EOPNOTSUPP; 357 } 358 } 359 360 static int 361 set_config(struct uchcom_softc *sc) 362 { 363 usbd_status err; 364 365 err = usbd_set_config_index(sc->sc_udev, UCHCOM_CONFIG_INDEX, 1); 366 if (err) { 367 aprint_error_dev(sc->sc_dev, 368 "failed to set configuration: %s\n", usbd_errstr(err)); 369 return -1; 370 } 371 372 return 0; 373 } 374 375 static int 376 find_ifaces(struct uchcom_softc *sc, struct usbd_interface **riface) 377 { 378 usbd_status err; 379 380 err = usbd_device2interface_handle(sc->sc_udev, UCHCOM_IFACE_INDEX, 381 riface); 382 if (err) { 383 aprint_error("\n%s: failed to get interface: %s\n", 384 device_xname(sc->sc_dev), usbd_errstr(err)); 385 return -1; 386 } 387 388 return 0; 389 } 390 391 static int 392 find_endpoints(struct uchcom_softc *sc, struct uchcom_endpoints *endpoints) 393 { 394 int i, bin=-1, bout=-1, intr=-1, isize=0; 395 usb_interface_descriptor_t *id; 396 usb_endpoint_descriptor_t *ed; 397 398 id = usbd_get_interface_descriptor(sc->sc_iface); 399 400 for (i = 0; i < id->bNumEndpoints; i++) { 401 ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i); 402 if (ed == NULL) { 403 aprint_error_dev(sc->sc_dev, 404 "no endpoint descriptor for %d\n", i); 405 return -1; 406 } 407 408 if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 409 UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) { 410 intr = ed->bEndpointAddress; 411 isize = UGETW(ed->wMaxPacketSize); 412 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN && 413 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 414 bin = ed->bEndpointAddress; 415 } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT && 416 UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) { 417 bout = ed->bEndpointAddress; 418 } 419 } 420 421 if (intr == -1 || bin == -1 || bout == -1) { 422 if (intr == -1) { 423 aprint_error_dev(sc->sc_dev, 424 "no interrupt end point\n"); 425 } 426 if (bin == -1) { 427 aprint_error_dev(sc->sc_dev, 428 "no data bulk in end point\n"); 429 } 430 if (bout == -1) { 431 aprint_error_dev(sc->sc_dev, 432 "no data bulk out end point\n"); 433 } 434 return -1; 435 } 436 if (isize < UCHCOM_INTR_LEAST) { 437 aprint_error_dev(sc->sc_dev, "intr pipe is too short\n"); 438 return -1; 439 } 440 441 DPRINTF(("%s: bulkin=%d, bulkout=%d, intr=%d, isize=%d\n", 442 device_xname(sc->sc_dev), bin, bout, intr, isize)); 443 444 endpoints->ep_intr = intr; 445 endpoints->ep_intr_size = isize; 446 endpoints->ep_bulkin = bin; 447 endpoints->ep_bulkout = bout; 448 449 return 0; 450 } 451 452 453 /* ---------------------------------------------------------------------- 454 * low level i/o 455 */ 456 457 static __inline usbd_status 458 generic_control_out(struct uchcom_softc *sc, uint8_t reqno, 459 uint16_t value, uint16_t index) 460 { 461 usb_device_request_t req; 462 463 req.bmRequestType = UT_WRITE_VENDOR_DEVICE; 464 req.bRequest = reqno; 465 USETW(req.wValue, value); 466 USETW(req.wIndex, index); 467 USETW(req.wLength, 0); 468 469 return usbd_do_request(sc->sc_udev, &req, 0); 470 } 471 472 static __inline usbd_status 473 generic_control_in(struct uchcom_softc *sc, uint8_t reqno, 474 uint16_t value, uint16_t index, void *buf, int buflen, 475 int *actlen) 476 { 477 usb_device_request_t req; 478 479 req.bmRequestType = UT_READ_VENDOR_DEVICE; 480 req.bRequest = reqno; 481 USETW(req.wValue, value); 482 USETW(req.wIndex, index); 483 USETW(req.wLength, (uint16_t)buflen); 484 485 return usbd_do_request_flags(sc->sc_udev, &req, buf, 486 USBD_SHORT_XFER_OK, actlen, 487 USBD_DEFAULT_TIMEOUT); 488 } 489 490 static __inline usbd_status 491 write_reg(struct uchcom_softc *sc, 492 uint8_t reg1, uint8_t val1, uint8_t reg2, uint8_t val2) 493 { 494 DPRINTF(("%s: write reg 0x%02X<-0x%02X, 0x%02X<-0x%02X\n", 495 device_xname(sc->sc_dev), 496 (unsigned)reg1, (unsigned)val1, 497 (unsigned)reg2, (unsigned)val2)); 498 return generic_control_out( 499 sc, UCHCOM_REQ_WRITE_REG, 500 reg1|((uint16_t)reg2<<8), val1|((uint16_t)val2<<8)); 501 } 502 503 static __inline usbd_status 504 read_reg(struct uchcom_softc *sc, 505 uint8_t reg1, uint8_t *rval1, uint8_t reg2, uint8_t *rval2) 506 { 507 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 508 usbd_status err; 509 int actin; 510 511 err = generic_control_in( 512 sc, UCHCOM_REQ_READ_REG, 513 reg1|((uint16_t)reg2<<8), 0, buf, sizeof(buf), &actin); 514 if (err) 515 return err; 516 517 DPRINTF(("%s: read reg 0x%02X->0x%02X, 0x%02X->0x%02X\n", 518 device_xname(sc->sc_dev), 519 (unsigned)reg1, (unsigned)buf[0], 520 (unsigned)reg2, (unsigned)buf[1])); 521 522 if (rval1) *rval1 = buf[0]; 523 if (rval2) *rval2 = buf[1]; 524 525 return USBD_NORMAL_COMPLETION; 526 } 527 528 static __inline usbd_status 529 get_version(struct uchcom_softc *sc, uint8_t *rver) 530 { 531 uint8_t buf[UCHCOM_INPUT_BUF_SIZE]; 532 usbd_status err; 533 int actin; 534 535 err = generic_control_in( 536 sc, UCHCOM_REQ_GET_VERSION, 0, 0, buf, sizeof(buf), &actin); 537 if (err) 538 return err; 539 540 if (rver) *rver = buf[0]; 541 542 return USBD_NORMAL_COMPLETION; 543 } 544 545 static __inline usbd_status 546 get_status(struct uchcom_softc *sc, uint8_t *rval) 547 { 548 return read_reg(sc, UCHCOM_REG_STAT1, rval, UCHCOM_REG_STAT2, NULL); 549 } 550 551 static __inline usbd_status 552 set_dtrrts_10(struct uchcom_softc *sc, uint8_t val) 553 { 554 return write_reg(sc, UCHCOM_REG_STAT1, val, UCHCOM_REG_STAT1, val); 555 } 556 557 static __inline usbd_status 558 set_dtrrts_20(struct uchcom_softc *sc, uint8_t val) 559 { 560 return generic_control_out(sc, UCHCOM_REQ_SET_DTRRTS, val, 0); 561 } 562 563 564 /* ---------------------------------------------------------------------- 565 * middle layer 566 */ 567 568 static int 569 update_version(struct uchcom_softc *sc) 570 { 571 usbd_status err; 572 573 err = get_version(sc, &sc->sc_version); 574 if (err) { 575 aprint_error_dev(sc->sc_dev, "cannot get version: %s\n", 576 usbd_errstr(err)); 577 return EIO; 578 } 579 DPRINTF(("%s: update_version %d\n", device_xname(sc->sc_dev), sc->sc_version)); 580 581 return 0; 582 } 583 584 static void 585 convert_status(struct uchcom_softc *sc, uint8_t cur) 586 { 587 sc->sc_dtr = !(cur & UCHCOM_DTR_MASK); 588 sc->sc_rts = !(cur & UCHCOM_RTS_MASK); 589 590 cur = ~cur & 0x0F; 591 sc->sc_msr = (cur << 4) | ((sc->sc_msr >> 4) ^ cur); 592 } 593 594 static int 595 update_status(struct uchcom_softc *sc) 596 { 597 usbd_status err; 598 uint8_t cur; 599 600 err = get_status(sc, &cur); 601 if (err) { 602 aprint_error_dev(sc->sc_dev, 603 "cannot update status: %s\n", usbd_errstr(err)); 604 return EIO; 605 } 606 convert_status(sc, cur); 607 608 return 0; 609 } 610 611 612 static int 613 set_dtrrts(struct uchcom_softc *sc, int dtr, int rts) 614 { 615 usbd_status err; 616 uint8_t val = 0; 617 618 if (dtr) val |= UCHCOM_DTR_MASK; 619 if (rts) val |= UCHCOM_RTS_MASK; 620 621 if (sc->sc_version < UCHCOM_VER_20) 622 err = set_dtrrts_10(sc, ~val); 623 else 624 err = set_dtrrts_20(sc, ~val); 625 626 if (err) { 627 aprint_error_dev(sc->sc_dev, "cannot set DTR/RTS: %s\n", 628 usbd_errstr(err)); 629 return EIO; 630 } 631 632 return 0; 633 } 634 635 static int 636 set_break(struct uchcom_softc *sc, int onoff) 637 { 638 usbd_status err; 639 uint8_t brk1, brk2; 640 641 err = read_reg(sc, UCHCOM_REG_BREAK1, &brk1, UCHCOM_REG_BREAK2, &brk2); 642 if (err) 643 return EIO; 644 if (onoff) { 645 /* on - clear bits */ 646 brk1 &= ~UCHCOM_BRK1_MASK; 647 brk2 &= ~UCHCOM_BRK2_MASK; 648 } else { 649 /* off - set bits */ 650 brk1 |= UCHCOM_BRK1_MASK; 651 brk2 |= UCHCOM_BRK2_MASK; 652 } 653 err = write_reg(sc, UCHCOM_REG_BREAK1, brk1, UCHCOM_REG_BREAK2, brk2); 654 if (err) 655 return EIO; 656 657 return 0; 658 } 659 660 static int 661 calc_divider_settings(struct uchcom_divider *dp, uint32_t rate) 662 { 663 int i; 664 const struct uchcom_divider_record *rp; 665 uint32_t div, rem, mod; 666 667 /* find record */ 668 for (i=0; i<NUM_DIVIDERS; i++) { 669 if (dividers[i].dvr_high >= rate && 670 dividers[i].dvr_low <= rate) { 671 rp = ÷rs[i]; 672 goto found; 673 } 674 } 675 return -1; 676 677 found: 678 dp->dv_prescaler = rp->dvr_divider.dv_prescaler; 679 if (rp->dvr_base_clock == UCHCOM_BASE_UNKNOWN) 680 dp->dv_div = rp->dvr_divider.dv_div; 681 else { 682 div = rp->dvr_base_clock / rate; 683 rem = rp->dvr_base_clock % rate; 684 if (div==0 || div>=0xFF) 685 return -1; 686 if ((rem<<1) >= rate) 687 div += 1; 688 dp->dv_div = (uint8_t)-div; 689 } 690 691 mod = UCHCOM_BPS_MOD_BASE/rate + UCHCOM_BPS_MOD_BASE_OFS; 692 mod = mod + mod/2; 693 694 dp->dv_mod = mod / 0x100; 695 696 return 0; 697 } 698 699 static int 700 set_dte_rate(struct uchcom_softc *sc, uint32_t rate) 701 { 702 usbd_status err; 703 struct uchcom_divider dv; 704 705 if (calc_divider_settings(&dv, rate)) 706 return EINVAL; 707 708 if ((err = write_reg(sc, 709 UCHCOM_REG_BPS_PRE, dv.dv_prescaler, 710 UCHCOM_REG_BPS_DIV, dv.dv_div)) || 711 (err = write_reg(sc, 712 UCHCOM_REG_BPS_MOD, dv.dv_mod, 713 UCHCOM_REG_BPS_PAD, 0))) { 714 aprint_error_dev(sc->sc_dev, "cannot set DTE rate: %s\n", 715 usbd_errstr(err)); 716 return EIO; 717 } 718 719 return 0; 720 } 721 722 static int 723 set_line_control(struct uchcom_softc *sc, tcflag_t cflag) 724 { 725 if (sc->sc_version < UCHCOM_VER_30) { 726 usbd_status err; 727 uint8_t lcr1val = 0, lcr2val = 0; 728 729 err = read_reg(sc, UCHCOM_REG_LCR1, &lcr1val, UCHCOM_REG_LCR2, &lcr2val); 730 if (err) { 731 aprint_error_dev(sc->sc_dev, "cannot get LCR: %s\n", 732 usbd_errstr(err)); 733 return EIO; 734 } 735 736 lcr1val &= ~UCHCOM_LCR1_MASK; 737 lcr2val &= ~UCHCOM_LCR2_MASK; 738 739 /* 740 * XXX: it is difficult to handle the line control appropriately: 741 * - CS8, !CSTOPB and any parity mode seems ok, but 742 * - the chip doesn't have the function to calculate parity 743 * in !CS8 mode. 744 * - it is unclear that the chip supports CS5,6 mode. 745 * - it is unclear how to handle stop bits. 746 */ 747 748 switch (ISSET(cflag, CSIZE)) { 749 case CS5: 750 case CS6: 751 case CS7: 752 return EINVAL; 753 case CS8: 754 break; 755 } 756 757 if (ISSET(cflag, PARENB)) { 758 lcr1val |= UCHCOM_LCR1_PARENB; 759 if (ISSET(cflag, PARODD)) 760 lcr2val |= UCHCOM_LCR2_PARODD; 761 else 762 lcr2val |= UCHCOM_LCR2_PAREVEN; 763 } 764 765 err = write_reg(sc, UCHCOM_REG_LCR1, lcr1val, UCHCOM_REG_LCR2, lcr2val); 766 if (err) { 767 aprint_error_dev(sc->sc_dev, "cannot set LCR: %s\n", 768 usbd_errstr(err)); 769 return EIO; 770 } 771 } 772 773 return 0; 774 } 775 776 static int 777 clear_chip(struct uchcom_softc *sc) 778 { 779 usbd_status err; 780 781 DPRINTF(("%s: clear\n", device_xname(sc->sc_dev))); 782 err = generic_control_out(sc, UCHCOM_REQ_RESET, 0, 0); 783 if (err) { 784 aprint_error_dev(sc->sc_dev, "cannot clear: %s\n", 785 usbd_errstr(err)); 786 return EIO; 787 } 788 789 return 0; 790 } 791 792 static int 793 reset_chip(struct uchcom_softc *sc) 794 { 795 usbd_status err; 796 uint8_t lcr1val, lcr2val, pre, div, mod; 797 uint16_t val=0, idx=0; 798 799 err = read_reg(sc, UCHCOM_REG_LCR1, &lcr1val, UCHCOM_REG_LCR2, &lcr2val); 800 if (err) 801 goto failed; 802 803 err = read_reg(sc, UCHCOM_REG_BPS_PRE, &pre, UCHCOM_REG_BPS_DIV, &div); 804 if (err) 805 goto failed; 806 807 err = read_reg(sc, UCHCOM_REG_BPS_MOD, &mod, UCHCOM_REG_BPS_PAD, NULL); 808 if (err) 809 goto failed; 810 811 val |= (uint16_t)(lcr1val&0xF0) << 8; 812 val |= 0x01; 813 val |= (uint16_t)(lcr2val&0x0F) << 8; 814 val |= 0x02; 815 idx |= pre & 0x07; 816 val |= 0x04; 817 idx |= (uint16_t)div << 8; 818 val |= 0x08; 819 idx |= mod & 0xF8; 820 val |= 0x10; 821 822 DPRINTF(("%s: reset v=0x%04X, i=0x%04X\n", 823 device_xname(sc->sc_dev), val, idx)); 824 825 err = generic_control_out(sc, UCHCOM_REQ_RESET, val, idx); 826 if (err) 827 goto failed; 828 829 return 0; 830 831 failed: 832 printf("%s: cannot reset: %s\n", 833 device_xname(sc->sc_dev), usbd_errstr(err)); 834 return EIO; 835 } 836 837 static int 838 setup_comm(struct uchcom_softc *sc) 839 { 840 int ret; 841 842 ret = update_version(sc); 843 if (ret) 844 return ret; 845 846 ret = clear_chip(sc); 847 if (ret) 848 return ret; 849 850 ret = set_dte_rate(sc, TTYDEF_SPEED); 851 if (ret) 852 return ret; 853 854 ret = set_line_control(sc, CS8); 855 if (ret) 856 return ret; 857 858 ret = update_status(sc); 859 if (ret) 860 return ret; 861 862 ret = reset_chip(sc); 863 if (ret) 864 return ret; 865 866 ret = set_dte_rate(sc, TTYDEF_SPEED); /* XXX */ 867 if (ret) 868 return ret; 869 870 sc->sc_dtr = sc->sc_rts = 1; 871 ret = set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 872 if (ret) 873 return ret; 874 875 return 0; 876 } 877 878 static int 879 setup_intr_pipe(struct uchcom_softc *sc) 880 { 881 usbd_status err; 882 883 if (sc->sc_intr_endpoint != -1 && sc->sc_intr_pipe == NULL) { 884 sc->sc_intr_buf = kmem_alloc(sc->sc_intr_size, KM_SLEEP); 885 err = usbd_open_pipe_intr(sc->sc_iface, 886 sc->sc_intr_endpoint, 887 USBD_SHORT_XFER_OK, 888 &sc->sc_intr_pipe, sc, 889 sc->sc_intr_buf, 890 sc->sc_intr_size, 891 uchcom_intr, USBD_DEFAULT_INTERVAL); 892 if (err) { 893 aprint_error_dev(sc->sc_dev, 894 "cannot open interrupt pipe: %s\n", 895 usbd_errstr(err)); 896 return EIO; 897 } 898 } 899 return 0; 900 } 901 902 static void 903 close_intr_pipe(struct uchcom_softc *sc) 904 { 905 usbd_status err; 906 907 if (sc->sc_dying) 908 return; 909 910 if (sc->sc_intr_pipe != NULL) { 911 err = usbd_abort_pipe(sc->sc_intr_pipe); 912 if (err) 913 aprint_error_dev(sc->sc_dev, 914 "abort interrupt pipe failed: %s\n", 915 usbd_errstr(err)); 916 err = usbd_close_pipe(sc->sc_intr_pipe); 917 if (err) 918 aprint_error_dev(sc->sc_dev, 919 "close interrupt pipe failed: %s\n", 920 usbd_errstr(err)); 921 kmem_free(sc->sc_intr_buf, sc->sc_intr_size); 922 sc->sc_intr_pipe = NULL; 923 } 924 } 925 926 927 /* ---------------------------------------------------------------------- 928 * methods for ucom 929 */ 930 void 931 uchcom_get_status(void *arg, int portno, u_char *rlsr, u_char *rmsr) 932 { 933 struct uchcom_softc *sc = arg; 934 935 if (sc->sc_dying) 936 return; 937 938 *rlsr = sc->sc_lsr; 939 *rmsr = sc->sc_msr; 940 } 941 942 void 943 uchcom_set(void *arg, int portno, int reg, int onoff) 944 { 945 struct uchcom_softc *sc = arg; 946 947 if (sc->sc_dying) 948 return; 949 950 switch (reg) { 951 case UCOM_SET_DTR: 952 sc->sc_dtr = !!onoff; 953 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 954 break; 955 case UCOM_SET_RTS: 956 sc->sc_rts = !!onoff; 957 set_dtrrts(sc, sc->sc_dtr, sc->sc_rts); 958 break; 959 case UCOM_SET_BREAK: 960 set_break(sc, onoff); 961 break; 962 } 963 } 964 965 int 966 uchcom_param(void *arg, int portno, struct termios *t) 967 { 968 struct uchcom_softc *sc = arg; 969 int ret; 970 971 if (sc->sc_dying) 972 return 0; 973 974 ret = set_line_control(sc, t->c_cflag); 975 if (ret) 976 return ret; 977 978 ret = set_dte_rate(sc, t->c_ospeed); 979 if (ret) 980 return ret; 981 982 return 0; 983 } 984 985 int 986 uchcom_open(void *arg, int portno) 987 { 988 int ret; 989 struct uchcom_softc *sc = arg; 990 991 if (sc->sc_dying) 992 return EIO; 993 994 ret = setup_intr_pipe(sc); 995 if (ret) 996 return ret; 997 998 ret = setup_comm(sc); 999 if (ret) 1000 return ret; 1001 1002 return 0; 1003 } 1004 1005 void 1006 uchcom_close(void *arg, int portno) 1007 { 1008 struct uchcom_softc *sc = arg; 1009 1010 if (sc->sc_dying) 1011 return; 1012 1013 close_intr_pipe(sc); 1014 } 1015 1016 1017 /* ---------------------------------------------------------------------- 1018 * callback when the modem status is changed. 1019 */ 1020 void 1021 uchcom_intr(struct usbd_xfer *xfer, void * priv, 1022 usbd_status status) 1023 { 1024 struct uchcom_softc *sc = priv; 1025 u_char *buf = sc->sc_intr_buf; 1026 1027 if (sc->sc_dying) 1028 return; 1029 1030 if (status != USBD_NORMAL_COMPLETION) { 1031 if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) 1032 return; 1033 1034 DPRINTF(("%s: abnormal status: %s\n", 1035 device_xname(sc->sc_dev), usbd_errstr(status))); 1036 usbd_clear_endpoint_stall_async(sc->sc_intr_pipe); 1037 return; 1038 } 1039 DPRINTF(("%s: intr: 0x%02X 0x%02X 0x%02X 0x%02X " 1040 "0x%02X 0x%02X 0x%02X 0x%02X\n", 1041 device_xname(sc->sc_dev), 1042 (unsigned)buf[0], (unsigned)buf[1], 1043 (unsigned)buf[2], (unsigned)buf[3], 1044 (unsigned)buf[4], (unsigned)buf[5], 1045 (unsigned)buf[6], (unsigned)buf[7])); 1046 1047 convert_status(sc, buf[UCHCOM_INTR_STAT1]); 1048 ucom_status_change(device_private(sc->sc_subdev)); 1049 } 1050
Indexes created Wed Sep 24 05:09:52 GMT 2025