source: rtems-libbsd/freebsd/sys/dev/usb/serial/umct.c @ 286c391

55-freebsd-126-freebsd-12
Last change on this file since 286c391 was 286c391, checked in by Kevin Kirspel <kevin-kirspel@…>, on 05/12/17 at 12:16:22

Adding FREEBSD USB Serial Drivers
  • Property mode set to 100644
File size: 16.3 KB
Line 
1#include <machine/rtems-bsd-kernel-space.h>
2
3#include <sys/cdefs.h>
4__FBSDID("$FreeBSD$");
5
6/*-
7 * Copyright (c) 2003 Scott Long
8 * All rights reserved.
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 */
32
33/*
34 * Driver for the MCT (Magic Control Technology) USB-RS232 Converter.
35 * Based on the superb documentation from the linux mct_u232 driver by
36 * Wolfgang Grandeggar <wolfgang@cec.ch>.
37 * This device smells a lot like the Belkin F5U103, except that it has
38 * suffered some mild brain-damage.  This driver is based off of the ubsa.c
39 * driver from Alexander Kabaev <kan@FreeBSD.org>.  Merging the two together
40 * might be useful, though the subtle differences might lead to lots of
41 * #ifdef's.
42 */
43
44/*
45 * NOTE: all function names beginning like "umct_cfg_" can only
46 * be called from within the config thread function !
47 */
48
49#include <sys/stdint.h>
50#include <sys/stddef.h>
51#include <rtems/bsd/sys/param.h>
52#include <sys/queue.h>
53#include <sys/types.h>
54#include <sys/systm.h>
55#include <sys/kernel.h>
56#include <sys/bus.h>
57#include <sys/module.h>
58#include <rtems/bsd/sys/lock.h>
59#include <sys/mutex.h>
60#include <sys/condvar.h>
61#include <sys/sysctl.h>
62#include <sys/sx.h>
63#include <rtems/bsd/sys/unistd.h>
64#include <sys/callout.h>
65#include <sys/malloc.h>
66#include <sys/priv.h>
67
68#include <dev/usb/usb.h>
69#include <dev/usb/usbdi.h>
70#include <dev/usb/usbdi_util.h>
71#include <rtems/bsd/local/usbdevs.h>
72
73#define USB_DEBUG_VAR usb_debug
74#include <dev/usb/usb_debug.h>
75#include <dev/usb/usb_process.h>
76
77#include <dev/usb/serial/usb_serial.h>
78
79/* The UMCT advertises the standard 8250 UART registers */
80#define UMCT_GET_MSR            2       /* Get Modem Status Register */
81#define UMCT_GET_MSR_SIZE       1
82#define UMCT_GET_LCR            6       /* Get Line Control Register */
83#define UMCT_GET_LCR_SIZE       1
84#define UMCT_SET_BAUD           5       /* Set the Baud Rate Divisor */
85#define UMCT_SET_BAUD_SIZE      4
86#define UMCT_SET_LCR            7       /* Set Line Control Register */
87#define UMCT_SET_LCR_SIZE       1
88#define UMCT_SET_MCR            10      /* Set Modem Control Register */
89#define UMCT_SET_MCR_SIZE       1
90
91#define UMCT_MSR_CTS_CHG        0x01
92#define UMCT_MSR_DSR_CHG        0x02
93#define UMCT_MSR_RI_CHG         0x04
94#define UMCT_MSR_CD_CHG         0x08
95#define UMCT_MSR_CTS            0x10
96#define UMCT_MSR_RTS            0x20
97#define UMCT_MSR_RI             0x40
98#define UMCT_MSR_CD             0x80
99
100#define UMCT_INTR_INTERVAL      100
101#define UMCT_IFACE_INDEX        0
102#define UMCT_CONFIG_INDEX       0
103
104enum {
105        UMCT_BULK_DT_WR,
106        UMCT_BULK_DT_RD,
107        UMCT_INTR_DT_RD,
108        UMCT_N_TRANSFER,
109};
110
111struct umct_softc {
112        struct ucom_super_softc sc_super_ucom;
113        struct ucom_softc sc_ucom;
114
115        struct usb_device *sc_udev;
116        struct usb_xfer *sc_xfer[UMCT_N_TRANSFER];
117        struct mtx sc_mtx;
118
119        uint32_t sc_unit;
120
121        uint16_t sc_obufsize;
122
123        uint8_t sc_lsr;
124        uint8_t sc_msr;
125        uint8_t sc_lcr;
126        uint8_t sc_mcr;
127        uint8_t sc_iface_no;
128        uint8_t sc_swap_cb;
129};
130
131/* prototypes */
132
133static device_probe_t umct_probe;
134static device_attach_t umct_attach;
135static device_detach_t umct_detach;
136static void umct_free_softc(struct umct_softc *);
137
138static usb_callback_t umct_intr_callback;
139static usb_callback_t umct_intr_callback_sub;
140static usb_callback_t umct_read_callback;
141static usb_callback_t umct_read_callback_sub;
142static usb_callback_t umct_write_callback;
143
144static void     umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
145                    uint16_t len, uint32_t value);
146static void     umct_free(struct ucom_softc *);
147static void     umct_cfg_get_status(struct ucom_softc *, uint8_t *,
148                    uint8_t *);
149static void     umct_cfg_set_break(struct ucom_softc *, uint8_t);
150static void     umct_cfg_set_dtr(struct ucom_softc *, uint8_t);
151static void     umct_cfg_set_rts(struct ucom_softc *, uint8_t);
152static uint8_t  umct_calc_baud(uint32_t);
153static int      umct_pre_param(struct ucom_softc *, struct termios *);
154static void     umct_cfg_param(struct ucom_softc *, struct termios *);
155static void     umct_start_read(struct ucom_softc *);
156static void     umct_stop_read(struct ucom_softc *);
157static void     umct_start_write(struct ucom_softc *);
158static void     umct_stop_write(struct ucom_softc *);
159static void     umct_poll(struct ucom_softc *ucom);
160
161static const struct usb_config umct_config[UMCT_N_TRANSFER] = {
162
163        [UMCT_BULK_DT_WR] = {
164                .type = UE_BULK,
165                .endpoint = UE_ADDR_ANY,
166                .direction = UE_DIR_OUT,
167                .bufsize = 0,   /* use wMaxPacketSize */
168                .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
169                .callback = &umct_write_callback,
170        },
171
172        [UMCT_BULK_DT_RD] = {
173                .type = UE_INTERRUPT,
174                .endpoint = UE_ADDR_ANY,
175                .direction = UE_DIR_IN,
176                .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
177                .bufsize = 0,   /* use wMaxPacketSize */
178                .callback = &umct_read_callback,
179                .ep_index = 0,          /* first interrupt endpoint */
180        },
181
182        [UMCT_INTR_DT_RD] = {
183                .type = UE_INTERRUPT,
184                .endpoint = UE_ADDR_ANY,
185                .direction = UE_DIR_IN,
186                .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
187                .bufsize = 0,   /* use wMaxPacketSize */
188                .callback = &umct_intr_callback,
189                .ep_index = 1,          /* second interrupt endpoint */
190        },
191};
192
193static const struct ucom_callback umct_callback = {
194        .ucom_cfg_get_status = &umct_cfg_get_status,
195        .ucom_cfg_set_dtr = &umct_cfg_set_dtr,
196        .ucom_cfg_set_rts = &umct_cfg_set_rts,
197        .ucom_cfg_set_break = &umct_cfg_set_break,
198        .ucom_cfg_param = &umct_cfg_param,
199        .ucom_pre_param = &umct_pre_param,
200        .ucom_start_read = &umct_start_read,
201        .ucom_stop_read = &umct_stop_read,
202        .ucom_start_write = &umct_start_write,
203        .ucom_stop_write = &umct_stop_write,
204        .ucom_poll = &umct_poll,
205        .ucom_free = &umct_free,
206};
207
208static const STRUCT_USB_HOST_ID umct_devs[] = {
209        {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_USB232, 0)},
210        {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_SITECOM_USB232, 0)},
211        {USB_VPI(USB_VENDOR_MCT, USB_PRODUCT_MCT_DU_H3SP_USB232, 0)},
212        {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U109, 0)},
213        {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U409, 0)},
214};
215
216static device_method_t umct_methods[] = {
217        DEVMETHOD(device_probe, umct_probe),
218        DEVMETHOD(device_attach, umct_attach),
219        DEVMETHOD(device_detach, umct_detach),
220        DEVMETHOD_END
221};
222
223static devclass_t umct_devclass;
224
225static driver_t umct_driver = {
226        .name = "umct",
227        .methods = umct_methods,
228        .size = sizeof(struct umct_softc),
229};
230
231DRIVER_MODULE(umct, uhub, umct_driver, umct_devclass, NULL, 0);
232MODULE_DEPEND(umct, ucom, 1, 1, 1);
233MODULE_DEPEND(umct, usb, 1, 1, 1);
234MODULE_VERSION(umct, 1);
235USB_PNP_HOST_INFO(umct_devs);
236
237static int
238umct_probe(device_t dev)
239{
240        struct usb_attach_arg *uaa = device_get_ivars(dev);
241
242        if (uaa->usb_mode != USB_MODE_HOST) {
243                return (ENXIO);
244        }
245        if (uaa->info.bConfigIndex != UMCT_CONFIG_INDEX) {
246                return (ENXIO);
247        }
248        if (uaa->info.bIfaceIndex != UMCT_IFACE_INDEX) {
249                return (ENXIO);
250        }
251        return (usbd_lookup_id_by_uaa(umct_devs, sizeof(umct_devs), uaa));
252}
253
254static int
255umct_attach(device_t dev)
256{
257        struct usb_attach_arg *uaa = device_get_ivars(dev);
258        struct umct_softc *sc = device_get_softc(dev);
259        int32_t error;
260        uint16_t maxp;
261        uint8_t iface_index;
262
263        sc->sc_udev = uaa->device;
264        sc->sc_unit = device_get_unit(dev);
265
266        device_set_usb_desc(dev);
267        mtx_init(&sc->sc_mtx, "umct", NULL, MTX_DEF);
268        ucom_ref(&sc->sc_super_ucom);
269
270        sc->sc_iface_no = uaa->info.bIfaceNum;
271
272        iface_index = UMCT_IFACE_INDEX;
273        error = usbd_transfer_setup(uaa->device, &iface_index,
274            sc->sc_xfer, umct_config, UMCT_N_TRANSFER, sc, &sc->sc_mtx);
275
276        if (error) {
277                device_printf(dev, "allocating USB "
278                    "transfers failed\n");
279                goto detach;
280        }
281
282        /*
283         * The real bulk-in endpoint is also marked as an interrupt.
284         * The only way to differentiate it from the real interrupt
285         * endpoint is to look at the wMaxPacketSize field.
286         */
287        maxp = usbd_xfer_max_framelen(sc->sc_xfer[UMCT_BULK_DT_RD]);
288        if (maxp == 0x2) {
289
290                /* guessed wrong - switch around endpoints */
291
292                struct usb_xfer *temp = sc->sc_xfer[UMCT_INTR_DT_RD];
293
294                sc->sc_xfer[UMCT_INTR_DT_RD] = sc->sc_xfer[UMCT_BULK_DT_RD];
295                sc->sc_xfer[UMCT_BULK_DT_RD] = temp;
296                sc->sc_swap_cb = 1;
297        }
298
299        sc->sc_obufsize = usbd_xfer_max_len(sc->sc_xfer[UMCT_BULK_DT_WR]);
300
301        if (uaa->info.idProduct == USB_PRODUCT_MCT_SITECOM_USB232) {
302                if (sc->sc_obufsize > 16) {
303                        sc->sc_obufsize = 16;
304                }
305        }
306        error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
307            &umct_callback, &sc->sc_mtx);
308        if (error) {
309                goto detach;
310        }
311        ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
312
313        return (0);                     /* success */
314
315detach:
316        umct_detach(dev);
317        return (ENXIO);                 /* failure */
318}
319
320static int
321umct_detach(device_t dev)
322{
323        struct umct_softc *sc = device_get_softc(dev);
324
325        ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
326        usbd_transfer_unsetup(sc->sc_xfer, UMCT_N_TRANSFER);
327
328        device_claim_softc(dev);
329
330        umct_free_softc(sc);
331
332        return (0);
333}
334
335UCOM_UNLOAD_DRAIN(umct);
336
337static void
338umct_free_softc(struct umct_softc *sc)
339{
340        if (ucom_unref(&sc->sc_super_ucom)) {
341                mtx_destroy(&sc->sc_mtx);
342                device_free_softc(sc);
343        }
344}
345
346static void
347umct_free(struct ucom_softc *ucom)
348{
349        umct_free_softc(ucom->sc_parent);
350}
351
352static void
353umct_cfg_do_request(struct umct_softc *sc, uint8_t request,
354    uint16_t len, uint32_t value)
355{
356        struct usb_device_request req;
357        usb_error_t err;
358        uint8_t temp[4];
359
360        if (len > 4)
361                len = 4;
362        req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
363        req.bRequest = request;
364        USETW(req.wValue, 0);
365        req.wIndex[0] = sc->sc_iface_no;
366        req.wIndex[1] = 0;
367        USETW(req.wLength, len);
368        USETDW(temp, value);
369
370        err = ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom,
371            &req, temp, 0, 1000);
372        if (err) {
373                DPRINTFN(0, "device request failed, err=%s "
374                    "(ignored)\n", usbd_errstr(err));
375        }
376        return;
377}
378
379static void
380umct_intr_callback_sub(struct usb_xfer *xfer, usb_error_t error)
381{
382        struct umct_softc *sc = usbd_xfer_softc(xfer);
383        struct usb_page_cache *pc;
384        uint8_t buf[2];
385        int actlen;
386
387        usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
388
389        switch (USB_GET_STATE(xfer)) {
390        case USB_ST_TRANSFERRED:
391                if (actlen < 2) {
392                        DPRINTF("too short message\n");
393                        goto tr_setup;
394                }
395                pc = usbd_xfer_get_frame(xfer, 0);
396                usbd_copy_out(pc, 0, buf, sizeof(buf));
397
398                /*
399                 * MSR bits need translation from ns16550 to SER_* values.
400                 * LSR bits are ns16550 in hardware and ucom.
401                 */
402                sc->sc_msr = 0;
403                if (buf[0] & UMCT_MSR_CTS)
404                        sc->sc_msr |= SER_CTS;
405                if (buf[0] & UMCT_MSR_CD)
406                        sc->sc_msr |= SER_DCD;
407                if (buf[0] & UMCT_MSR_RI)
408                        sc->sc_msr |= SER_RI;
409                if (buf[0] & UMCT_MSR_RTS)
410                        sc->sc_msr |= SER_DSR;
411                sc->sc_lsr = buf[1];
412
413                ucom_status_change(&sc->sc_ucom);
414                /* FALLTHROUGH */
415        case USB_ST_SETUP:
416tr_setup:
417                usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
418                usbd_transfer_submit(xfer);
419                return;
420
421        default:                        /* Error */
422                if (error != USB_ERR_CANCELLED) {
423                        /* try to clear stall first */
424                        usbd_xfer_set_stall(xfer);
425                        goto tr_setup;
426                }
427                return;
428        }
429}
430
431static void
432umct_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
433{
434        struct umct_softc *sc = ucom->sc_parent;
435
436        *lsr = sc->sc_lsr;
437        *msr = sc->sc_msr;
438}
439
440static void
441umct_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
442{
443        struct umct_softc *sc = ucom->sc_parent;
444
445        if (onoff)
446                sc->sc_lcr |= 0x40;
447        else
448                sc->sc_lcr &= ~0x40;
449
450        umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, sc->sc_lcr);
451}
452
453static void
454umct_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
455{
456        struct umct_softc *sc = ucom->sc_parent;
457
458        if (onoff)
459                sc->sc_mcr |= 0x01;
460        else
461                sc->sc_mcr &= ~0x01;
462
463        umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
464}
465
466static void
467umct_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
468{
469        struct umct_softc *sc = ucom->sc_parent;
470
471        if (onoff)
472                sc->sc_mcr |= 0x02;
473        else
474                sc->sc_mcr &= ~0x02;
475
476        umct_cfg_do_request(sc, UMCT_SET_MCR, UMCT_SET_MCR_SIZE, sc->sc_mcr);
477}
478
479static uint8_t
480umct_calc_baud(uint32_t baud)
481{
482        switch (baud) {
483                case B300:return (0x1);
484        case B600:
485                return (0x2);
486        case B1200:
487                return (0x3);
488        case B2400:
489                return (0x4);
490        case B4800:
491                return (0x6);
492        case B9600:
493                return (0x8);
494        case B19200:
495                return (0x9);
496        case B38400:
497                return (0xa);
498        case B57600:
499                return (0xb);
500        case 115200:
501                return (0xc);
502        case B0:
503        default:
504                break;
505        }
506        return (0x0);
507}
508
509static int
510umct_pre_param(struct ucom_softc *ucom, struct termios *t)
511{
512        return (0);                     /* we accept anything */
513}
514
515static void
516umct_cfg_param(struct ucom_softc *ucom, struct termios *t)
517{
518        struct umct_softc *sc = ucom->sc_parent;
519        uint32_t value;
520
521        value = umct_calc_baud(t->c_ospeed);
522        umct_cfg_do_request(sc, UMCT_SET_BAUD, UMCT_SET_BAUD_SIZE, value);
523
524        value = (sc->sc_lcr & 0x40);
525
526        switch (t->c_cflag & CSIZE) {
527        case CS5:
528                value |= 0x0;
529                break;
530        case CS6:
531                value |= 0x1;
532                break;
533        case CS7:
534                value |= 0x2;
535                break;
536        default:
537        case CS8:
538                value |= 0x3;
539                break;
540        }
541
542        value |= (t->c_cflag & CSTOPB) ? 0x4 : 0;
543        if (t->c_cflag & PARENB) {
544                value |= 0x8;
545                value |= (t->c_cflag & PARODD) ? 0x0 : 0x10;
546        }
547        /*
548         * XXX There doesn't seem to be a way to tell the device
549         * to use flow control.
550         */
551
552        sc->sc_lcr = value;
553        umct_cfg_do_request(sc, UMCT_SET_LCR, UMCT_SET_LCR_SIZE, value);
554}
555
556static void
557umct_start_read(struct ucom_softc *ucom)
558{
559        struct umct_softc *sc = ucom->sc_parent;
560
561        /* start interrupt endpoint */
562        usbd_transfer_start(sc->sc_xfer[UMCT_INTR_DT_RD]);
563
564        /* start read endpoint */
565        usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_RD]);
566}
567
568static void
569umct_stop_read(struct ucom_softc *ucom)
570{
571        struct umct_softc *sc = ucom->sc_parent;
572
573        /* stop interrupt endpoint */
574        usbd_transfer_stop(sc->sc_xfer[UMCT_INTR_DT_RD]);
575
576        /* stop read endpoint */
577        usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_RD]);
578}
579
580static void
581umct_start_write(struct ucom_softc *ucom)
582{
583        struct umct_softc *sc = ucom->sc_parent;
584
585        usbd_transfer_start(sc->sc_xfer[UMCT_BULK_DT_WR]);
586}
587
588static void
589umct_stop_write(struct ucom_softc *ucom)
590{
591        struct umct_softc *sc = ucom->sc_parent;
592
593        usbd_transfer_stop(sc->sc_xfer[UMCT_BULK_DT_WR]);
594}
595
596static void
597umct_read_callback(struct usb_xfer *xfer, usb_error_t error)
598{
599        struct umct_softc *sc = usbd_xfer_softc(xfer);
600
601        if (sc->sc_swap_cb)
602                umct_intr_callback_sub(xfer, error);
603        else
604                umct_read_callback_sub(xfer, error);
605}
606
607static void
608umct_intr_callback(struct usb_xfer *xfer, usb_error_t error)
609{
610        struct umct_softc *sc = usbd_xfer_softc(xfer);
611
612        if (sc->sc_swap_cb)
613                umct_read_callback_sub(xfer, error);
614        else
615                umct_intr_callback_sub(xfer, error);
616}
617
618static void
619umct_write_callback(struct usb_xfer *xfer, usb_error_t error)
620{
621        struct umct_softc *sc = usbd_xfer_softc(xfer);
622        struct usb_page_cache *pc;
623        uint32_t actlen;
624
625        switch (USB_GET_STATE(xfer)) {
626        case USB_ST_SETUP:
627        case USB_ST_TRANSFERRED:
628tr_setup:
629                pc = usbd_xfer_get_frame(xfer, 0);
630                if (ucom_get_data(&sc->sc_ucom, pc, 0,
631                    sc->sc_obufsize, &actlen)) {
632
633                        usbd_xfer_set_frame_len(xfer, 0, actlen);
634                        usbd_transfer_submit(xfer);
635                }
636                return;
637
638        default:                        /* Error */
639                if (error != USB_ERR_CANCELLED) {
640                        /* try to clear stall first */
641                        usbd_xfer_set_stall(xfer);
642                        goto tr_setup;
643                }
644                return;
645        }
646}
647
648static void
649umct_read_callback_sub(struct usb_xfer *xfer, usb_error_t error)
650{
651        struct umct_softc *sc = usbd_xfer_softc(xfer);
652        struct usb_page_cache *pc;
653        int actlen;
654
655        usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
656
657        switch (USB_GET_STATE(xfer)) {
658        case USB_ST_TRANSFERRED:
659                pc = usbd_xfer_get_frame(xfer, 0);
660                ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
661
662        case USB_ST_SETUP:
663tr_setup:
664                usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
665                usbd_transfer_submit(xfer);
666                return;
667
668        default:                        /* Error */
669                if (error != USB_ERR_CANCELLED) {
670                        /* try to clear stall first */
671                        usbd_xfer_set_stall(xfer);
672                        goto tr_setup;
673                }
674                return;
675        }
676}
677
678static void
679umct_poll(struct ucom_softc *ucom)
680{
681        struct umct_softc *sc = ucom->sc_parent;
682        usbd_transfer_poll(sc->sc_xfer, UMCT_N_TRANSFER);
683}
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