FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/serial/ubsa.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD AND BSD-2-Clause-NetBSD
      *
      * Copyright (c) 2002, Alexander Kabaev <kan.FreeBSD.org>.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    /*-
     * Copyright (c) 2001 The NetBSD Foundation, Inc.
     * All rights reserved.
     *
     * This code is derived from software contributed to The NetBSD Foundation
     * by Ichiro FUKUHARA (ichiro@ichiro.org).
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/stdint.h>
    #include <sys/stddef.h>
    #include <sys/param.h>
    #include <sys/queue.h>
    #include <sys/types.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/module.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/condvar.h>
    #include <sys/sysctl.h>
    #include <sys/sx.h>
    #include <sys/unistd.h>
    #include <sys/callout.h>
    #include <sys/malloc.h>
    #include <sys/priv.h>
    
    #include <dev/usb/usb.h>
    #include <dev/usb/usbdi.h>
    #include <dev/usb/usbdi_util.h>
    #include "usbdevs.h"
    
    #define USB_DEBUG_VAR ubsa_debug
    #include <dev/usb/usb_debug.h>
    #include <dev/usb/usb_process.h>
    
    #include <dev/usb/serial/usb_serial.h>
    
    #ifdef USB_DEBUG
    static int ubsa_debug = 0;
    
    static SYSCTL_NODE(_hw_usb, OID_AUTO, ubsa, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
        "USB ubsa");
    SYSCTL_INT(_hw_usb_ubsa, OID_AUTO, debug, CTLFLAG_RWTUN,
        &ubsa_debug, 0, "ubsa debug level");
    #endif
    
    #define UBSA_BSIZE             1024     /* bytes */
   
   #define UBSA_CONFIG_INDEX       0
   #define UBSA_IFACE_INDEX        0
   
   #define UBSA_REG_BAUDRATE       0x00
   #define UBSA_REG_STOP_BITS      0x01
   #define UBSA_REG_DATA_BITS      0x02
   #define UBSA_REG_PARITY         0x03
   #define UBSA_REG_DTR            0x0A
   #define UBSA_REG_RTS            0x0B
   #define UBSA_REG_BREAK          0x0C
   #define UBSA_REG_FLOW_CTRL      0x10
   
   #define UBSA_PARITY_NONE        0x00
   #define UBSA_PARITY_EVEN        0x01
   #define UBSA_PARITY_ODD         0x02
   #define UBSA_PARITY_MARK        0x03
   #define UBSA_PARITY_SPACE       0x04
   
   #define UBSA_FLOW_NONE          0x0000
   #define UBSA_FLOW_OCTS          0x0001
   #define UBSA_FLOW_ODSR          0x0002
   #define UBSA_FLOW_IDSR          0x0004
   #define UBSA_FLOW_IDTR          0x0008
   #define UBSA_FLOW_IRTS          0x0010
   #define UBSA_FLOW_ORTS          0x0020
   #define UBSA_FLOW_UNKNOWN       0x0040
   #define UBSA_FLOW_OXON          0x0080
   #define UBSA_FLOW_IXON          0x0100
   
   /* line status register */
   #define UBSA_LSR_TSRE           0x40    /* Transmitter empty: byte sent */
   #define UBSA_LSR_TXRDY          0x20    /* Transmitter buffer empty */
   #define UBSA_LSR_BI             0x10    /* Break detected */
   #define UBSA_LSR_FE             0x08    /* Framing error: bad stop bit */
   #define UBSA_LSR_PE             0x04    /* Parity error */
   #define UBSA_LSR_OE             0x02    /* Overrun, lost incoming byte */
   #define UBSA_LSR_RXRDY          0x01    /* Byte ready in Receive Buffer */
   #define UBSA_LSR_RCV_MASK       0x1f    /* Mask for incoming data or error */
   
   /* modem status register */
   /* All deltas are from the last read of the MSR. */
   #define UBSA_MSR_DCD            0x80    /* Current Data Carrier Detect */
   #define UBSA_MSR_RI             0x40    /* Current Ring Indicator */
   #define UBSA_MSR_DSR            0x20    /* Current Data Set Ready */
   #define UBSA_MSR_CTS            0x10    /* Current Clear to Send */
   #define UBSA_MSR_DDCD           0x08    /* DCD has changed state */
   #define UBSA_MSR_TERI           0x04    /* RI has toggled low to high */
   #define UBSA_MSR_DDSR           0x02    /* DSR has changed state */
   #define UBSA_MSR_DCTS           0x01    /* CTS has changed state */
   
   enum {
           UBSA_BULK_DT_WR,
           UBSA_BULK_DT_RD,
           UBSA_INTR_DT_RD,
           UBSA_N_TRANSFER,
   };
   
   struct ubsa_softc {
           struct ucom_super_softc sc_super_ucom;
           struct ucom_softc sc_ucom;
   
           struct usb_xfer *sc_xfer[UBSA_N_TRANSFER];
           struct usb_device *sc_udev;
           struct mtx sc_mtx;
   
           uint8_t sc_iface_no;            /* interface number */
           uint8_t sc_iface_index;         /* interface index */
           uint8_t sc_lsr;                 /* local status register */
           uint8_t sc_msr;                 /* UBSA status register */
   };
   
   static device_probe_t ubsa_probe;
   static device_attach_t ubsa_attach;
   static device_detach_t ubsa_detach;
   static void ubsa_free_softc(struct ubsa_softc *);
   
   static usb_callback_t ubsa_write_callback;
   static usb_callback_t ubsa_read_callback;
   static usb_callback_t ubsa_intr_callback;
   
   static void     ubsa_cfg_request(struct ubsa_softc *, uint8_t, uint16_t);
   static void     ubsa_free(struct ucom_softc *);
   static void     ubsa_cfg_set_dtr(struct ucom_softc *, uint8_t);
   static void     ubsa_cfg_set_rts(struct ucom_softc *, uint8_t);
   static void     ubsa_cfg_set_break(struct ucom_softc *, uint8_t);
   static int      ubsa_pre_param(struct ucom_softc *, struct termios *);
   static void     ubsa_cfg_param(struct ucom_softc *, struct termios *);
   static void     ubsa_start_read(struct ucom_softc *);
   static void     ubsa_stop_read(struct ucom_softc *);
   static void     ubsa_start_write(struct ucom_softc *);
   static void     ubsa_stop_write(struct ucom_softc *);
   static void     ubsa_cfg_get_status(struct ucom_softc *, uint8_t *,
                       uint8_t *);
   static void     ubsa_poll(struct ucom_softc *ucom);
   
   static const struct usb_config ubsa_config[UBSA_N_TRANSFER] = {
           [UBSA_BULK_DT_WR] = {
                   .type = UE_BULK,
                   .endpoint = UE_ADDR_ANY,
                   .direction = UE_DIR_OUT,
                   .bufsize = UBSA_BSIZE,  /* bytes */
                   .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
                   .callback = &ubsa_write_callback,
           },
   
           [UBSA_BULK_DT_RD] = {
                   .type = UE_BULK,
                   .endpoint = UE_ADDR_ANY,
                   .direction = UE_DIR_IN,
                   .bufsize = UBSA_BSIZE,  /* bytes */
                   .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
                   .callback = &ubsa_read_callback,
           },
   
           [UBSA_INTR_DT_RD] = {
                   .type = UE_INTERRUPT,
                   .endpoint = UE_ADDR_ANY,
                   .direction = UE_DIR_IN,
                   .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
                   .bufsize = 0,   /* use wMaxPacketSize */
                   .callback = &ubsa_intr_callback,
           },
   };
   
   static const struct ucom_callback ubsa_callback = {
           .ucom_cfg_get_status = &ubsa_cfg_get_status,
           .ucom_cfg_set_dtr = &ubsa_cfg_set_dtr,
           .ucom_cfg_set_rts = &ubsa_cfg_set_rts,
           .ucom_cfg_set_break = &ubsa_cfg_set_break,
           .ucom_cfg_param = &ubsa_cfg_param,
           .ucom_pre_param = &ubsa_pre_param,
           .ucom_start_read = &ubsa_start_read,
           .ucom_stop_read = &ubsa_stop_read,
           .ucom_start_write = &ubsa_start_write,
           .ucom_stop_write = &ubsa_stop_write,
           .ucom_poll = &ubsa_poll,
           .ucom_free = &ubsa_free,
   };
   
   static const STRUCT_USB_HOST_ID ubsa_devs[] = {
           /* AnyData ADU-500A */
           {USB_VPI(USB_VENDOR_ANYDATA, USB_PRODUCT_ANYDATA_ADU_500A, 0)},
           /* AnyData ADU-E100A/H */
           {USB_VPI(USB_VENDOR_ANYDATA, USB_PRODUCT_ANYDATA_ADU_E100X, 0)},
           /* Axesstel MV100H */
           {USB_VPI(USB_VENDOR_AXESSTEL, USB_PRODUCT_AXESSTEL_DATAMODEM, 0)},
           /* BELKIN F5U103 */
           {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U103, 0)},
           /* BELKIN F5U120 */
           {USB_VPI(USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U120, 0)},
           /* GoHubs GO-COM232 */
           {USB_VPI(USB_VENDOR_ETEK, USB_PRODUCT_ETEK_1COM, 0)},
           /* GoHubs GO-COM232 */
           {USB_VPI(USB_VENDOR_GOHUBS, USB_PRODUCT_GOHUBS_GOCOM232, 0)},
           /* Peracom */
           {USB_VPI(USB_VENDOR_PERACOM, USB_PRODUCT_PERACOM_SERIAL1, 0)},
   };
   
   static device_method_t ubsa_methods[] = {
           DEVMETHOD(device_probe, ubsa_probe),
           DEVMETHOD(device_attach, ubsa_attach),
           DEVMETHOD(device_detach, ubsa_detach),
           DEVMETHOD_END
   };
   
   static driver_t ubsa_driver = {
           .name = "ubsa",
           .methods = ubsa_methods,
           .size = sizeof(struct ubsa_softc),
   };
   
   DRIVER_MODULE(ubsa, uhub, ubsa_driver, NULL, NULL);
   MODULE_DEPEND(ubsa, ucom, 1, 1, 1);
   MODULE_DEPEND(ubsa, usb, 1, 1, 1);
   MODULE_VERSION(ubsa, 1);
   USB_PNP_HOST_INFO(ubsa_devs);
   
   static int
   ubsa_probe(device_t dev)
   {
           struct usb_attach_arg *uaa = device_get_ivars(dev);
   
           if (uaa->usb_mode != USB_MODE_HOST) {
                   return (ENXIO);
           }
           if (uaa->info.bConfigIndex != UBSA_CONFIG_INDEX) {
                   return (ENXIO);
           }
           if (uaa->info.bIfaceIndex != UBSA_IFACE_INDEX) {
                   return (ENXIO);
           }
           return (usbd_lookup_id_by_uaa(ubsa_devs, sizeof(ubsa_devs), uaa));
   }
   
   static int
   ubsa_attach(device_t dev)
   {
           struct usb_attach_arg *uaa = device_get_ivars(dev);
           struct ubsa_softc *sc = device_get_softc(dev);
           int error;
   
           DPRINTF("sc=%p\n", sc);
   
           device_set_usb_desc(dev);
           mtx_init(&sc->sc_mtx, "ubsa", NULL, MTX_DEF);
           ucom_ref(&sc->sc_super_ucom);
   
           sc->sc_udev = uaa->device;
           sc->sc_iface_no = uaa->info.bIfaceNum;
           sc->sc_iface_index = UBSA_IFACE_INDEX;
   
           error = usbd_transfer_setup(uaa->device, &sc->sc_iface_index,
               sc->sc_xfer, ubsa_config, UBSA_N_TRANSFER, sc, &sc->sc_mtx);
   
           if (error) {
                   DPRINTF("could not allocate all pipes\n");
                   goto detach;
           }
           /* clear stall at first run */
           mtx_lock(&sc->sc_mtx);
           usbd_xfer_set_stall(sc->sc_xfer[UBSA_BULK_DT_WR]);
           usbd_xfer_set_stall(sc->sc_xfer[UBSA_BULK_DT_RD]);
           mtx_unlock(&sc->sc_mtx);
   
           error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
               &ubsa_callback, &sc->sc_mtx);
           if (error) {
                   DPRINTF("ucom_attach failed\n");
                   goto detach;
           }
           ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);
   
           return (0);
   
   detach:
           ubsa_detach(dev);
           return (ENXIO);
   }
   
   static int
   ubsa_detach(device_t dev)
   {
           struct ubsa_softc *sc = device_get_softc(dev);
   
           DPRINTF("sc=%p\n", sc);
   
           ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
           usbd_transfer_unsetup(sc->sc_xfer, UBSA_N_TRANSFER);
   
           device_claim_softc(dev);
   
           ubsa_free_softc(sc);
   
           return (0);
   }
   
   UCOM_UNLOAD_DRAIN(ubsa);
   
   static void
   ubsa_free_softc(struct ubsa_softc *sc)
   {
           if (ucom_unref(&sc->sc_super_ucom)) {
                   mtx_destroy(&sc->sc_mtx);
                   device_free_softc(sc);
           }
   }
   
   static void
   ubsa_free(struct ucom_softc *ucom)
   {
           ubsa_free_softc(ucom->sc_parent);
   }
   
   static void
   ubsa_cfg_request(struct ubsa_softc *sc, uint8_t index, uint16_t value)
   {
           struct usb_device_request req;
           usb_error_t err;
   
           req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
           req.bRequest = index;
           USETW(req.wValue, value);
           req.wIndex[0] = sc->sc_iface_no;
           req.wIndex[1] = 0;
           USETW(req.wLength, 0);
   
           err = ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
               &req, NULL, 0, 1000);
           if (err) {
                   DPRINTFN(0, "device request failed, err=%s "
                       "(ignored)\n", usbd_errstr(err));
           }
   }
   
   static void
   ubsa_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           DPRINTF("onoff = %d\n", onoff);
   
           ubsa_cfg_request(sc, UBSA_REG_DTR, onoff ? 1 : 0);
   }
   
   static void
   ubsa_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           DPRINTF("onoff = %d\n", onoff);
   
           ubsa_cfg_request(sc, UBSA_REG_RTS, onoff ? 1 : 0);
   }
   
   static void
   ubsa_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           DPRINTF("onoff = %d\n", onoff);
   
           ubsa_cfg_request(sc, UBSA_REG_BREAK, onoff ? 1 : 0);
   }
   
   static int
   ubsa_pre_param(struct ucom_softc *ucom, struct termios *t)
   {
   
           DPRINTF("sc = %p\n", ucom->sc_parent);
   
           switch (t->c_ospeed) {
           case B0:
           case B300:
           case B600:
           case B1200:
           case B2400:
           case B4800:
           case B9600:
           case B19200:
           case B38400:
           case B57600:
           case B115200:
           case B230400:
                   break;
           default:
                   return (EINVAL);
           }
           return (0);
   }
   
   static void
   ubsa_cfg_param(struct ucom_softc *ucom, struct termios *t)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
           uint16_t value = 0;
   
           DPRINTF("sc = %p\n", sc);
   
           switch (t->c_ospeed) {
           case B0:
                   ubsa_cfg_request(sc, UBSA_REG_FLOW_CTRL, 0);
                   ubsa_cfg_set_dtr(&sc->sc_ucom, 0);
                   ubsa_cfg_set_rts(&sc->sc_ucom, 0);
                   break;
           case B300:
           case B600:
           case B1200:
           case B2400:
           case B4800:
           case B9600:
           case B19200:
           case B38400:
           case B57600:
           case B115200:
           case B230400:
                   value = B230400 / t->c_ospeed;
                   ubsa_cfg_request(sc, UBSA_REG_BAUDRATE, value);
                   break;
           default:
                   return;
           }
   
           if (t->c_cflag & PARENB)
                   value = (t->c_cflag & PARODD) ? UBSA_PARITY_ODD : UBSA_PARITY_EVEN;
           else
                   value = UBSA_PARITY_NONE;
   
           ubsa_cfg_request(sc, UBSA_REG_PARITY, value);
   
           switch (t->c_cflag & CSIZE) {
           case CS5:
                   value = 0;
                   break;
           case CS6:
                   value = 1;
                   break;
           case CS7:
                   value = 2;
                   break;
           default:
           case CS8:
                   value = 3;
                   break;
           }
   
           ubsa_cfg_request(sc, UBSA_REG_DATA_BITS, value);
   
           value = (t->c_cflag & CSTOPB) ? 1 : 0;
   
           ubsa_cfg_request(sc, UBSA_REG_STOP_BITS, value);
   
           value = 0;
           if (t->c_cflag & CRTSCTS)
                   value |= UBSA_FLOW_OCTS | UBSA_FLOW_IRTS;
   
           if (t->c_iflag & (IXON | IXOFF))
                   value |= UBSA_FLOW_OXON | UBSA_FLOW_IXON;
   
           ubsa_cfg_request(sc, UBSA_REG_FLOW_CTRL, value);
   }
   
   static void
   ubsa_start_read(struct ucom_softc *ucom)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           /* start interrupt endpoint */
           usbd_transfer_start(sc->sc_xfer[UBSA_INTR_DT_RD]);
   
           /* start read endpoint */
           usbd_transfer_start(sc->sc_xfer[UBSA_BULK_DT_RD]);
   }
   
   static void
   ubsa_stop_read(struct ucom_softc *ucom)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           /* stop interrupt endpoint */
           usbd_transfer_stop(sc->sc_xfer[UBSA_INTR_DT_RD]);
   
           /* stop read endpoint */
           usbd_transfer_stop(sc->sc_xfer[UBSA_BULK_DT_RD]);
   }
   
   static void
   ubsa_start_write(struct ucom_softc *ucom)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           usbd_transfer_start(sc->sc_xfer[UBSA_BULK_DT_WR]);
   }
   
   static void
   ubsa_stop_write(struct ucom_softc *ucom)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           usbd_transfer_stop(sc->sc_xfer[UBSA_BULK_DT_WR]);
   }
   
   static void
   ubsa_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
   
           DPRINTF("\n");
   
           *lsr = sc->sc_lsr;
           *msr = sc->sc_msr;
   }
   
   static void
   ubsa_write_callback(struct usb_xfer *xfer, usb_error_t error)
   {
           struct ubsa_softc *sc = usbd_xfer_softc(xfer);
           struct usb_page_cache *pc;
           uint32_t actlen;
   
           switch (USB_GET_STATE(xfer)) {
           case USB_ST_SETUP:
           case USB_ST_TRANSFERRED:
   tr_setup:
                   pc = usbd_xfer_get_frame(xfer, 0);
                   if (ucom_get_data(&sc->sc_ucom, pc, 0,
                       UBSA_BSIZE, &actlen)) {
                           usbd_xfer_set_frame_len(xfer, 0, actlen);
                           usbd_transfer_submit(xfer);
                   }
                   return;
   
           default:                        /* Error */
                   if (error != USB_ERR_CANCELLED) {
                           /* try to clear stall first */
                           usbd_xfer_set_stall(xfer);
                           goto tr_setup;
                   }
                   return;
           }
   }
   
   static void
   ubsa_read_callback(struct usb_xfer *xfer, usb_error_t error)
   {
           struct ubsa_softc *sc = usbd_xfer_softc(xfer);
           struct usb_page_cache *pc;
           int actlen;
   
           usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
   
           switch (USB_GET_STATE(xfer)) {
           case USB_ST_TRANSFERRED:
                   pc = usbd_xfer_get_frame(xfer, 0);
                   ucom_put_data(&sc->sc_ucom, pc, 0, actlen);
   
           case USB_ST_SETUP:
   tr_setup:
                   usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
                   usbd_transfer_submit(xfer);
                   return;
   
           default:                        /* Error */
                   if (error != USB_ERR_CANCELLED) {
                           /* try to clear stall first */
                           usbd_xfer_set_stall(xfer);
                           goto tr_setup;
                   }
                   return;
           }
   }
   
   static void
   ubsa_intr_callback(struct usb_xfer *xfer, usb_error_t error)
   {
           struct ubsa_softc *sc = usbd_xfer_softc(xfer);
           struct usb_page_cache *pc;
           uint8_t buf[4];
           int actlen;
   
           usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);
   
           switch (USB_GET_STATE(xfer)) {
           case USB_ST_TRANSFERRED:
   
                   if (actlen >= (int)sizeof(buf)) {
                           pc = usbd_xfer_get_frame(xfer, 0);
                           usbd_copy_out(pc, 0, buf, sizeof(buf));
   
                           /*
                            * MSR bits need translation from ns16550 to SER_* values.
                            * LSR bits are ns16550 in hardware and ucom.
                            */
                           sc->sc_msr = 0;
                           if (buf[3] & UBSA_MSR_CTS)
                                   sc->sc_msr |= SER_CTS;
                           if (buf[3] & UBSA_MSR_DCD)
                                   sc->sc_msr |= SER_DCD;
                           if (buf[3] & UBSA_MSR_RI)
                                   sc->sc_msr |= SER_RI;
                           if (buf[3] & UBSA_MSR_DSR)
                                   sc->sc_msr |= SER_DSR;
                           sc->sc_lsr = buf[2];
   
                           DPRINTF("lsr = 0x%02x, msr = 0x%02x\n",
                               sc->sc_lsr, sc->sc_msr);
   
                           ucom_status_change(&sc->sc_ucom);
                   } else {
                           DPRINTF("ignoring short packet, %d bytes\n", actlen);
                   }
                   /* FALLTHROUGH */
           case USB_ST_SETUP:
   tr_setup:
                   usbd_xfer_set_frame_len(xfer, 0, usbd_xfer_max_len(xfer));
                   usbd_transfer_submit(xfer);
                   return;
   
           default:                        /* Error */
                   if (error != USB_ERR_CANCELLED) {
                           /* try to clear stall first */
                           usbd_xfer_set_stall(xfer);
                           goto tr_setup;
                   }
                   return;
           }
   }
   
   static void
   ubsa_poll(struct ucom_softc *ucom)
   {
           struct ubsa_softc *sc = ucom->sc_parent;
           usbd_transfer_poll(sc->sc_xfer, UBSA_N_TRANSFER);
   
   }

Cache object: e7932050a2106b27e5a459b249568192