sys/dev/usb/serial/uslcom.c

   1 /*      $OpenBSD: uslcom.c,v 1.17 2007/11/24 10:52:12 jsg Exp $ */
   2
   3 #include <sys/cdefs.h>
   4 __FBSDID("$FreeBSD$");
   5
   6 /*
   7  * Copyright (c) 2006 Jonathan Gray <jsg@openbsd.org>
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  19  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  */
  21
  22 #include <sys/stdint.h>
  23 #include <sys/stddef.h>
  24 #include <sys/param.h>
  25 #include <sys/queue.h>
  26 #include <sys/types.h>
  27 #include <sys/systm.h>
  28 #include <sys/kernel.h>
  29 #include <sys/bus.h>
  30 #include <sys/linker_set.h>
  31 #include <sys/module.h>
  32 #include <sys/lock.h>
  33 #include <sys/mutex.h>
  34 #include <sys/condvar.h>
  35 #include <sys/sysctl.h>
  36 #include <sys/sx.h>
  37 #include <sys/unistd.h>
  38 #include <sys/callout.h>
  39 #include <sys/malloc.h>
  40 #include <sys/priv.h>
  41
  42 #include <dev/usb/usb.h>
  43 #include <dev/usb/usbdi.h>
  44 #include <dev/usb/usbdi_util.h>
  45 #include "usbdevs.h"
  46
  47 #define USB_DEBUG_VAR uslcom_debug
  48 #include <dev/usb/usb_debug.h>
  49 #include <dev/usb/usb_process.h>
  50
  51 #include <dev/usb/serial/usb_serial.h>
  52
  53 #ifdef USB_DEBUG
  54 static int uslcom_debug = 0;
  55
  56 SYSCTL_NODE(_hw_usb, OID_AUTO, uslcom, CTLFLAG_RW, 0, "USB uslcom");
  57 SYSCTL_INT(_hw_usb_uslcom, OID_AUTO, debug, CTLFLAG_RW,
  58     &uslcom_debug, 0, "Debug level");
  59 #endif
  60
  61 #define USLCOM_BULK_BUF_SIZE            1024
  62 #define USLCOM_CONFIG_INDEX     0
  63 #define USLCOM_IFACE_INDEX      0
  64
  65 #define USLCOM_SET_DATA_BITS(x) ((x) << 8)
  66
  67 #define USLCOM_WRITE            0x41
  68 #define USLCOM_READ             0xc1
  69
  70 #define USLCOM_UART             0x00
  71 #define USLCOM_BAUD_RATE        0x01
  72 #define USLCOM_DATA             0x03
  73 #define USLCOM_BREAK            0x05
  74 #define USLCOM_CTRL             0x07
  75
  76 #define USLCOM_UART_DISABLE     0x00
  77 #define USLCOM_UART_ENABLE      0x01
  78
  79 #define USLCOM_CTRL_DTR_ON      0x0001
  80 #define USLCOM_CTRL_DTR_SET     0x0100
  81 #define USLCOM_CTRL_RTS_ON      0x0002
  82 #define USLCOM_CTRL_RTS_SET     0x0200
  83 #define USLCOM_CTRL_CTS         0x0010
  84 #define USLCOM_CTRL_DSR         0x0020
  85 #define USLCOM_CTRL_DCD         0x0080
  86
  87 #define USLCOM_BAUD_REF         0x384000
  88
  89 #define USLCOM_STOP_BITS_1      0x00
  90 #define USLCOM_STOP_BITS_2      0x02
  91
  92 #define USLCOM_PARITY_NONE      0x00
  93 #define USLCOM_PARITY_ODD       0x10
  94 #define USLCOM_PARITY_EVEN      0x20
  95
  96 #define USLCOM_PORT_NO          0xFFFF /* XXX think this should be 0 --hps */
  97
  98 #define USLCOM_BREAK_OFF        0x00
  99 #define USLCOM_BREAK_ON         0x01
 100
 101 enum {
 102         USLCOM_BULK_DT_WR,
 103         USLCOM_BULK_DT_RD,
 104         USLCOM_N_TRANSFER,
 105 };
 106
 107 struct uslcom_softc {
 108         struct ucom_super_softc sc_super_ucom;
 109         struct ucom_softc sc_ucom;
 110
 111         struct usb_xfer *sc_xfer[USLCOM_N_TRANSFER];
 112         struct usb_device *sc_udev;
 113         struct mtx sc_mtx;
 114
 115         uint8_t          sc_msr;
 116         uint8_t          sc_lsr;
 117 };
 118
 119 static device_probe_t uslcom_probe;
 120 static device_attach_t uslcom_attach;
 121 static device_detach_t uslcom_detach;
 122
 123 static usb_callback_t uslcom_write_callback;
 124 static usb_callback_t uslcom_read_callback;
 125
 126 static void uslcom_open(struct ucom_softc *);
 127 static void uslcom_close(struct ucom_softc *);
 128 static void uslcom_set_dtr(struct ucom_softc *, uint8_t);
 129 static void uslcom_set_rts(struct ucom_softc *, uint8_t);
 130 static void uslcom_set_break(struct ucom_softc *, uint8_t);
 131 static int uslcom_pre_param(struct ucom_softc *, struct termios *);
 132 static void uslcom_param(struct ucom_softc *, struct termios *);
 133 static void uslcom_get_status(struct ucom_softc *, uint8_t *, uint8_t *);
 134 static void uslcom_start_read(struct ucom_softc *);
 135 static void uslcom_stop_read(struct ucom_softc *);
 136 static void uslcom_start_write(struct ucom_softc *);
 137 static void uslcom_stop_write(struct ucom_softc *);
 138 static void uslcom_poll(struct ucom_softc *ucom);
 139
 140 static const struct usb_config uslcom_config[USLCOM_N_TRANSFER] = {
 141
 142         [USLCOM_BULK_DT_WR] = {
 143                 .type = UE_BULK,
 144                 .endpoint = UE_ADDR_ANY,
 145                 .direction = UE_DIR_OUT,
 146                 .bufsize = USLCOM_BULK_BUF_SIZE,
 147                 .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
 148                 .callback = &uslcom_write_callback,
 149         },
 150
 151         [USLCOM_BULK_DT_RD] = {
 152                 .type = UE_BULK,
 153                 .endpoint = UE_ADDR_ANY,
 154                 .direction = UE_DIR_IN,
 155                 .bufsize = USLCOM_BULK_BUF_SIZE,
 156                 .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
 157                 .callback = &uslcom_read_callback,
 158         },
 159 };
 160
 161 static struct ucom_callback uslcom_callback = {
 162         .ucom_cfg_open = &uslcom_open,
 163         .ucom_cfg_close = &uslcom_close,
 164         .ucom_cfg_get_status = &uslcom_get_status,
 165         .ucom_cfg_set_dtr = &uslcom_set_dtr,
 166         .ucom_cfg_set_rts = &uslcom_set_rts,
 167         .ucom_cfg_set_break = &uslcom_set_break,
 168         .ucom_cfg_param = &uslcom_param,
 169         .ucom_pre_param = &uslcom_pre_param,
 170         .ucom_start_read = &uslcom_start_read,
 171         .ucom_stop_read = &uslcom_stop_read,
 172         .ucom_start_write = &uslcom_start_write,
 173         .ucom_stop_write = &uslcom_stop_write,
 174         .ucom_poll = &uslcom_poll,
 175 };
 176
 177 static const struct usb_device_id uslcom_devs[] = {
 178 #define USLCOM_DEV(v,p)  { USB_VP(USB_VENDOR_##v, USB_PRODUCT_##v##_##p) }
 179     USLCOM_DEV(BALTECH, CARDREADER),
 180     USLCOM_DEV(CLIPSAL, 5500PCU),
 181     USLCOM_DEV(DATAAPEX, MULTICOM),
 182     USLCOM_DEV(DELL, DW700),
 183     USLCOM_DEV(DIGIANSWER, ZIGBEE802154),
 184     USLCOM_DEV(DYNASTREAM, ANTDEVBOARD),
 185     USLCOM_DEV(DYNASTREAM, ANTDEVBOARD2),
 186     USLCOM_DEV(DYNASTREAM, ANT2USB),
 187     USLCOM_DEV(ELV, USBI2C),
 188     USLCOM_DEV(FOXCONN, PIRELLI_DP_L10),
 189     USLCOM_DEV(GEMALTO, PROXPU),
 190     USLCOM_DEV(JABLOTRON, PC60B),
 191     USLCOM_DEV(MEI, CASHFLOW_SC),
 192     USLCOM_DEV(MEI, S2000),
 193     USLCOM_DEV(JABLOTRON, PC60B),
 194     USLCOM_DEV(OWEN, AC4),
 195     USLCOM_DEV(PHILIPS, ACE1001),
 196     USLCOM_DEV(PLX, CA42),
 197     USLCOM_DEV(SILABS, AEROCOMM),
 198     USLCOM_DEV(SILABS, AMBER_AMB2560),
 199     USLCOM_DEV(SILABS, ARGUSISP),
 200     USLCOM_DEV(SILABS, ARKHAM_DS101_A),
 201     USLCOM_DEV(SILABS, ARKHAM_DS101_M),
 202     USLCOM_DEV(SILABS, ARYGON_MIFARE),
 203     USLCOM_DEV(SILABS, AVIT_USB_TTL),
 204     USLCOM_DEV(SILABS, BEI_VCP),
 205     USLCOM_DEV(SILABS, BSM7DUSB),
 206     USLCOM_DEV(SILABS, BURNSIDE),
 207     USLCOM_DEV(SILABS, C2_EDGE_MODEM),
 208     USLCOM_DEV(SILABS, CP2102),
 209     USLCOM_DEV(SILABS, CP210X_2),
 210     USLCOM_DEV(SILABS, CRUMB128),
 211     USLCOM_DEV(SILABS, CYGNAL),
 212     USLCOM_DEV(SILABS, CYGNAL_DEBUG),
 213     USLCOM_DEV(SILABS, CYGNAL_GPS),
 214     USLCOM_DEV(SILABS, DEGREE),
 215     USLCOM_DEV(SILABS, EMS_C1007),
 216     USLCOM_DEV(SILABS, HELICOM),
 217     USLCOM_DEV(SILABS, IMS_USB_RS422),
 218     USLCOM_DEV(SILABS, INFINITY_MIC),
 219     USLCOM_DEV(SILABS, INSYS_MODEM),
 220     USLCOM_DEV(SILABS, KYOCERA_GPS),
 221     USLCOM_DEV(SILABS, LIPOWSKY_HARP),
 222     USLCOM_DEV(SILABS, LIPOWSKY_JTAG),
 223     USLCOM_DEV(SILABS, LIPOWSKY_LIN),
 224     USLCOM_DEV(SILABS, MC35PU),
 225     USLCOM_DEV(SILABS, MJS_TOSLINK),
 226     USLCOM_DEV(SILABS, MSD_DASHHAWK),
 227     USLCOM_DEV(SILABS, POLOLU),
 228     USLCOM_DEV(SILABS, PROCYON_AVS),
 229     USLCOM_DEV(SILABS, SB_PARAMOUNT_ME),
 230     USLCOM_DEV(SILABS, SUUNTO),
 231     USLCOM_DEV(SILABS, TAMSMASTER),
 232     USLCOM_DEV(SILABS, TELEGESYS_ETRX2),
 233     USLCOM_DEV(SILABS, TRACIENT),
 234     USLCOM_DEV(SILABS, TRAQMATE),
 235     USLCOM_DEV(SILABS, USBCOUNT50),
 236     USLCOM_DEV(SILABS, USBPULSE100),
 237     USLCOM_DEV(SILABS, USBSCOPE50),
 238     USLCOM_DEV(SILABS, USBWAVE12),
 239     USLCOM_DEV(SILABS, VSTABI),
 240     USLCOM_DEV(SILABS, WAVIT),
 241     USLCOM_DEV(SILABS, WMRBATT),
 242     USLCOM_DEV(SILABS, WMRRIGBLASTER),
 243     USLCOM_DEV(SILABS, WMRRIGTALK),
 244     USLCOM_DEV(SILABS, ZEPHYR_BIO),
 245     USLCOM_DEV(SILABS2, DCU11CLONE),
 246     USLCOM_DEV(SILABS3, GPRS_MODEM),
 247     USLCOM_DEV(SILABS4, 100EU_MODEM),
 248     USLCOM_DEV(SYNTECH, CYPHERLAB100),
 249     USLCOM_DEV(USI, MC60),
 250     USLCOM_DEV(VAISALA, CABLE),
 251     USLCOM_DEV(WAVESENSE, JAZZ),
 252 #undef USLCOM_DEV
 253 };
 254
 255 static device_method_t uslcom_methods[] = {
 256         DEVMETHOD(device_probe, uslcom_probe),
 257         DEVMETHOD(device_attach, uslcom_attach),
 258         DEVMETHOD(device_detach, uslcom_detach),
 259         {0, 0}
 260 };
 261
 262 static devclass_t uslcom_devclass;
 263
 264 static driver_t uslcom_driver = {
 265         .name = "uslcom",
 266         .methods = uslcom_methods,
 267         .size = sizeof(struct uslcom_softc),
 268 };
 269
 270 DRIVER_MODULE(uslcom, uhub, uslcom_driver, uslcom_devclass, NULL, 0);
 271 MODULE_DEPEND(uslcom, ucom, 1, 1, 1);
 272 MODULE_DEPEND(uslcom, usb, 1, 1, 1);
 273 MODULE_VERSION(uslcom, 1);
 274
 275 static int
 276 uslcom_probe(device_t dev)
 277 {
 278         struct usb_attach_arg *uaa = device_get_ivars(dev);
 279
 280         DPRINTFN(11, "\n");
 281
 282         if (uaa->usb_mode != USB_MODE_HOST) {
 283                 return (ENXIO);
 284         }
 285         if (uaa->info.bConfigIndex != USLCOM_CONFIG_INDEX) {
 286                 return (ENXIO);
 287         }
 288         if (uaa->info.bIfaceIndex != USLCOM_IFACE_INDEX) {
 289                 return (ENXIO);
 290         }
 291         return (usbd_lookup_id_by_uaa(uslcom_devs, sizeof(uslcom_devs), uaa));
 292 }
 293
 294 static int
 295 uslcom_attach(device_t dev)
 296 {
 297         struct usb_attach_arg *uaa = device_get_ivars(dev);
 298         struct uslcom_softc *sc = device_get_softc(dev);
 299         int error;
 300
 301         DPRINTFN(11, "\n");
 302
 303         device_set_usb_desc(dev);
 304         mtx_init(&sc->sc_mtx, "uslcom", NULL, MTX_DEF);
 305
 306         sc->sc_udev = uaa->device;
 307
 308         error = usbd_transfer_setup(uaa->device,
 309             &uaa->info.bIfaceIndex, sc->sc_xfer, uslcom_config,
 310             USLCOM_N_TRANSFER, sc, &sc->sc_mtx);
 311         if (error) {
 312                 DPRINTF("one or more missing USB endpoints, "
 313                     "error=%s\n", usbd_errstr(error));
 314                 goto detach;
 315         }
 316         /* clear stall at first run */
 317         mtx_lock(&sc->sc_mtx);
 318         usbd_xfer_set_stall(sc->sc_xfer[USLCOM_BULK_DT_WR]);
 319         usbd_xfer_set_stall(sc->sc_xfer[USLCOM_BULK_DT_RD]);
 320         mtx_unlock(&sc->sc_mtx);
 321
 322         error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
 323             &uslcom_callback, &sc->sc_mtx);
 324         if (error) {
 325                 goto detach;
 326         }
 327         return (0);
 328
 329 detach:
 330         uslcom_detach(dev);
 331         return (ENXIO);
 332 }
 333
 334 static int
 335 uslcom_detach(device_t dev)
 336 {
 337         struct uslcom_softc *sc = device_get_softc(dev);
 338
 339         DPRINTF("sc=%p\n", sc);
 340
 341         ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom, 1);
 342         usbd_transfer_unsetup(sc->sc_xfer, USLCOM_N_TRANSFER);
 343         mtx_destroy(&sc->sc_mtx);
 344
 345         return (0);
 346 }
 347
 348 static void
 349 uslcom_open(struct ucom_softc *ucom)
 350 {
 351         struct uslcom_softc *sc = ucom->sc_parent;
 352         struct usb_device_request req;
 353
 354         req.bmRequestType = USLCOM_WRITE;
 355         req.bRequest = USLCOM_UART;
 356         USETW(req.wValue, USLCOM_UART_ENABLE);
 357         USETW(req.wIndex, USLCOM_PORT_NO);
 358         USETW(req.wLength, 0);
 359
 360         if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 361             &req, NULL, 0, 1000)) {
 362                 DPRINTF("UART enable failed (ignored)\n");
 363         }
 364 }
 365
 366 static void
 367 uslcom_close(struct ucom_softc *ucom)
 368 {
 369         struct uslcom_softc *sc = ucom->sc_parent;
 370         struct usb_device_request req;
 371
 372         req.bmRequestType = USLCOM_WRITE;
 373         req.bRequest = USLCOM_UART;
 374         USETW(req.wValue, USLCOM_UART_DISABLE);
 375         USETW(req.wIndex, USLCOM_PORT_NO);
 376         USETW(req.wLength, 0);
 377
 378         if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 379             &req, NULL, 0, 1000)) {
 380                 DPRINTF("UART disable failed (ignored)\n");
 381         }
 382 }
 383
 384 static void
 385 uslcom_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
 386 {
 387         struct uslcom_softc *sc = ucom->sc_parent;
 388         struct usb_device_request req;
 389         uint16_t ctl;
 390
 391         DPRINTF("onoff = %d\n", onoff);
 392
 393         ctl = onoff ? USLCOM_CTRL_DTR_ON : 0;
 394         ctl |= USLCOM_CTRL_DTR_SET;
 395
 396         req.bmRequestType = USLCOM_WRITE;
 397         req.bRequest = USLCOM_CTRL;
 398         USETW(req.wValue, ctl);
 399         USETW(req.wIndex, USLCOM_PORT_NO);
 400         USETW(req.wLength, 0);
 401
 402         if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 403             &req, NULL, 0, 1000)) {
 404                 DPRINTF("Setting DTR failed (ignored)\n");
 405         }
 406 }
 407
 408 static void
 409 uslcom_set_rts(struct ucom_softc *ucom, uint8_t onoff)
 410 {
 411         struct uslcom_softc *sc = ucom->sc_parent;
 412         struct usb_device_request req;
 413         uint16_t ctl;
 414
 415         DPRINTF("onoff = %d\n", onoff);
 416
 417         ctl = onoff ? USLCOM_CTRL_RTS_ON : 0;
 418         ctl |= USLCOM_CTRL_RTS_SET;
 419
 420         req.bmRequestType = USLCOM_WRITE;
 421         req.bRequest = USLCOM_CTRL;
 422         USETW(req.wValue, ctl);
 423         USETW(req.wIndex, USLCOM_PORT_NO);
 424         USETW(req.wLength, 0);
 425
 426         if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 427             &req, NULL, 0, 1000)) {
 428                 DPRINTF("Setting DTR failed (ignored)\n");
 429         }
 430 }
 431
 432 static int
 433 uslcom_pre_param(struct ucom_softc *ucom, struct termios *t)
 434 {
 435         if (t->c_ospeed <= 0 || t->c_ospeed > 921600)
 436                 return (EINVAL);
 437         return (0);
 438 }
 439
 440 static void
 441 uslcom_param(struct ucom_softc *ucom, struct termios *t)
 442 {
 443         struct uslcom_softc *sc = ucom->sc_parent;
 444         struct usb_device_request req;
 445         uint16_t data;
 446
 447         DPRINTF("\n");
 448
 449         req.bmRequestType = USLCOM_WRITE;
 450         req.bRequest = USLCOM_BAUD_RATE;
 451         USETW(req.wValue, USLCOM_BAUD_REF / t->c_ospeed);
 452         USETW(req.wIndex, USLCOM_PORT_NO);
 453         USETW(req.wLength, 0);
 454
 455         if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 456             &req, NULL, 0, 1000)) {
 457                 DPRINTF("Set baudrate failed (ignored)\n");
 458         }
 459
 460         if (t->c_cflag & CSTOPB)
 461                 data = USLCOM_STOP_BITS_2;
 462         else
 463                 data = USLCOM_STOP_BITS_1;
 464         if (t->c_cflag & PARENB) {
 465                 if (t->c_cflag & PARODD)
 466                         data |= USLCOM_PARITY_ODD;
 467                 else
 468                         data |= USLCOM_PARITY_EVEN;
 469         } else
 470                 data |= USLCOM_PARITY_NONE;
 471         switch (t->c_cflag & CSIZE) {
 472         case CS5:
 473                 data |= USLCOM_SET_DATA_BITS(5);
 474                 break;
 475         case CS6:
 476                 data |= USLCOM_SET_DATA_BITS(6);
 477                 break;
 478         case CS7:
 479                 data |= USLCOM_SET_DATA_BITS(7);
 480                 break;
 481         case CS8:
 482                 data |= USLCOM_SET_DATA_BITS(8);
 483                 break;
 484         }
 485
 486         req.bmRequestType = USLCOM_WRITE;
 487         req.bRequest = USLCOM_DATA;
 488         USETW(req.wValue, data);
 489         USETW(req.wIndex, USLCOM_PORT_NO);
 490         USETW(req.wLength, 0);
 491
 492         if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 493             &req, NULL, 0, 1000)) {
 494                 DPRINTF("Set format failed (ignored)\n");
 495         }
 496         return;
 497 }
 498
 499 static void
 500 uslcom_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
 501 {
 502         struct uslcom_softc *sc = ucom->sc_parent;
 503
 504         DPRINTF("\n");
 505
 506         *lsr = sc->sc_lsr;
 507         *msr = sc->sc_msr;
 508 }
 509
 510 static void
 511 uslcom_set_break(struct ucom_softc *ucom, uint8_t onoff)
 512 {
 513         struct uslcom_softc *sc = ucom->sc_parent;
 514         struct usb_device_request req;
 515         uint16_t brk = onoff ? USLCOM_BREAK_ON : USLCOM_BREAK_OFF;
 516
 517         req.bmRequestType = USLCOM_WRITE;
 518         req.bRequest = USLCOM_BREAK;
 519         USETW(req.wValue, brk);
 520         USETW(req.wIndex, USLCOM_PORT_NO);
 521         USETW(req.wLength, 0);
 522
 523         if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
 524             &req, NULL, 0, 1000)) {
 525                 DPRINTF("Set BREAK failed (ignored)\n");
 526         }
 527 }
 528
 529 static void
 530 uslcom_write_callback(struct usb_xfer *xfer, usb_error_t error)
 531 {
 532         struct uslcom_softc *sc = usbd_xfer_softc(xfer);
 533         struct usb_page_cache *pc;
 534         uint32_t actlen;
 535
 536         switch (USB_GET_STATE(xfer)) {
 537         case USB_ST_SETUP:
 538         case USB_ST_TRANSFERRED:
 539 tr_setup:
 540                 pc = usbd_xfer_get_frame(xfer, 0);
 541                 if (ucom_get_data(&sc->sc_ucom, pc, 0,
 542                     USLCOM_BULK_BUF_SIZE, &actlen)) {
 543
 544                         DPRINTF("actlen = %d\n", actlen);
 545
 546                         usbd_xfer_set_frame_len(xfer, 0, actlen);
 547                         usbd_transfer_submit(xfer);
 548                 }
 549                 return;
 550
 551         default:                        /* Error */
 552                 if (error != USB_ERR_CANCELLED) {
 553                         /* try to clear stall first */
 554                         usbd_xfer_set_stall(xfer);
 555                         goto tr_setup;
 556                 }
 557                 return;
 558         }
 559 }
 560
 561 static void
 562 uslcom_read_callback(struct usb_xfer *xfer, usb_error_t error)
 563 {
 564         struct uslcom_softc *sc = usbd_xfer_softc(xfer);
 565         struct usb_page_cache *pc;
 566         int actlen;
 567
 568         usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
 569
 570         switch (USB_GET_STATE(xfer)) {
 571         case USB_ST_TRANSFERRED:
 572                 pc = usbd_xfer_get_frame(xfer, 0);
 573                 ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
 574
 575         case USB_ST_SETUP:
 576 tr_setup:
 577                 usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
 578                 usbd_transfer_submit(xfer);
 579                 return;
 580
 581         default:                        /* Error */
 582                 if (error != USB_ERR_CANCELLED) {
 583                         /* try to clear stall first */
 584                         usbd_xfer_set_stall(xfer);
 585                         goto tr_setup;
 586                 }
 587                 return;
 588         }
 589 }
 590
 591 static void
 592 uslcom_start_read(struct ucom_softc *ucom)
 593 {
 594         struct uslcom_softc *sc = ucom->sc_parent;
 595
 596         /* start read endpoint */
 597         usbd_transfer_start(sc->sc_xfer[USLCOM_BULK_DT_RD]);
 598 }
 599
 600 static void
 601 uslcom_stop_read(struct ucom_softc *ucom)
 602 {
 603         struct uslcom_softc *sc = ucom->sc_parent;
 604
 605         /* stop read endpoint */
 606         usbd_transfer_stop(sc->sc_xfer[USLCOM_BULK_DT_RD]);
 607 }
 608
 609 static void
 610 uslcom_start_write(struct ucom_softc *ucom)
 611 {
 612         struct uslcom_softc *sc = ucom->sc_parent;
 613
 614         usbd_transfer_start(sc->sc_xfer[USLCOM_BULK_DT_WR]);
 615 }
 616
 617 static void
 618 uslcom_stop_write(struct ucom_softc *ucom)
 619 {
 620         struct uslcom_softc *sc = ucom->sc_parent;
 621
 622         usbd_transfer_stop(sc->sc_xfer[USLCOM_BULK_DT_WR]);
 623 }
 624
 625 static void
 626 uslcom_poll(struct ucom_softc *ucom)
 627 {
 628         struct uslcom_softc *sc = ucom->sc_parent;
 629         usbd_transfer_poll(sc->sc_xfer, USLCOM_N_TRANSFER);
 630 }