/*      $NetBSD: umodem_common.c,v 1.36 2022/07/31 13:01:16 mlelstv Exp $       */

/*
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson (lennart@augustsson.net) at
 * Carlstedt Research & Technology.
 *
 * 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.
 */

/*
 * Comm Class spec:  http://www.usb.org/developers/devclass_docs/usbccs10.pdf
 *                   http://www.usb.org/developers/devclass_docs/usbcdc11.pdf
 */

/*
 * TODO:
 * - Add error recovery in various places; the big problem is what
 *   to do in a callback if there is an error.
 * - Implement a Call Device for modems without multiplexed commands.
 *
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: umodem_common.c,v 1.36 2022/07/31 13:01:16 mlelstv Exp $");

#ifdef _KERNEL_OPT
#include "opt_usb.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/select.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/device.h>
#include <sys/poll.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbcdc.h>

#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdivar.h>
#include <dev/usb/usbdevs.h>
#include <dev/usb/usb_quirks.h>

#include <dev/usb/ucomvar.h>
#include <dev/usb/umodemvar.h>

#ifdef UMODEM_DEBUG
#define DPRINTFN(n, x)  if (umodemdebug > (n)) printf x
int     umodemdebug = 0;
#else
#define DPRINTFN(n, x)
#endif
#define DPRINTF(x) DPRINTFN(0, x)

/*
 * These are the maximum number of bytes transferred per frame.
 * If some really high speed devices should use this driver they
 * may need to be increased, but this is good enough for normal modems.
 *
 * Note: increased from 64/256, to better support EVDO wireless PPP.
 * The sizes should not be increased further, or there
 * will be problems with contiguous storage allocation.
 */
#define UMODEMIBUFSIZE 4096
#define UMODEMOBUFSIZE 4096

static usbd_status umodem_set_comm_feature(struct umodem_softc *,
                                           int, int);
static usbd_status umodem_set_line_coding(struct umodem_softc *,
                                          usb_cdc_line_state_t *);

static void     umodem_dtr(struct umodem_softc *, int);
static void     umodem_rts(struct umodem_softc *, int);
static void     umodem_break(struct umodem_softc *, int);
static void     umodem_set_line_state(struct umodem_softc *);
static void     umodem_intr(struct usbd_xfer *, void *, usbd_status);

/*
 * NOTE: Callers of umodem_common_attach() should initialise their ucaa
 * to 0 before assigning any fields.  ucaa_ibufsize, ucaa_ibufsize and
 * ucaa_obufsize may be set by the caller, but if 0 are set to default
 * umodem values.
 */
int
umodem_common_attach(device_t self, struct umodem_softc *sc,
    struct usbif_attach_arg *uiaa, struct ucom_attach_args *ucaa)
{
        struct usbd_device *dev = uiaa->uiaa_device;
        usb_interface_descriptor_t *id;
        usb_endpoint_descriptor_t *ed;
        char *devinfop;
        usbd_status err;
        int data_ifcno;
        int i;

        sc->sc_dev = self;
        sc->sc_udev = dev;
        sc->sc_ctl_iface = uiaa->uiaa_iface;
        sc->sc_dying = false;

        aprint_naive("\n");
        aprint_normal("\n");

        id = usbd_get_interface_descriptor(sc->sc_ctl_iface);
        devinfop = usbd_devinfo_alloc(uiaa->uiaa_device, 0);
        aprint_normal_dev(self, "%s, iclass %d/%d\n",
               devinfop, id->bInterfaceClass, id->bInterfaceSubClass);
        usbd_devinfo_free(devinfop);

        sc->sc_ctl_iface_no = id->bInterfaceNumber;

        /* Get the data interface no. */
        sc->sc_data_iface_no = data_ifcno =
            umodem_get_caps(dev, &sc->sc_cm_cap, &sc->sc_acm_cap, id);

        if (data_ifcno == -1) {
                aprint_error_dev(self, "no pointer to data interface\n");
                goto bad;
        }

        aprint_normal_dev(self,
            "data interface %d, has %sCM over data, has %sbreak\n",
            data_ifcno, sc->sc_cm_cap & USB_CDC_CM_OVER_DATA ? "" : "no ",
            sc->sc_acm_cap & USB_CDC_ACM_HAS_BREAK ? "" : "no ");

        /* Get the data interface too. */
        for (i = 0; i < uiaa->uiaa_nifaces; i++) {
                if (uiaa->uiaa_ifaces[i] != NULL) {
                        id = usbd_get_interface_descriptor(uiaa->uiaa_ifaces[i]);
                        if (id != NULL && id->bInterfaceNumber == data_ifcno) {
                                sc->sc_data_iface = uiaa->uiaa_ifaces[i];
                                uiaa->uiaa_ifaces[i] = NULL;
                        }
                }
        }
        if (sc->sc_data_iface == NULL) {
                aprint_error_dev(self, "no data interface\n");
                goto bad;
        }

        /*
         * Find the bulk endpoints.
         * Iterate over all endpoints in the data interface and take note.
         */
        ucaa->ucaa_bulkin = ucaa->ucaa_bulkout = -1;

        id = usbd_get_interface_descriptor(sc->sc_data_iface);
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(sc->sc_data_iface, i);
                if (ed == NULL) {
                        aprint_error_dev(self,
                            "no endpoint descriptor for %d\n)", i);
                        goto bad;
                }
                if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                    (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
                        ucaa->ucaa_bulkin = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
                           (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
                        ucaa->ucaa_bulkout = ed->bEndpointAddress;
                }
        }

        if (ucaa->ucaa_bulkin == -1) {
                aprint_error_dev(self, "Could not find data bulk in\n");
                goto bad;
        }
        if (ucaa->ucaa_bulkout == -1) {
                aprint_error_dev(self, "Could not find data bulk out\n");
                goto bad;
        }

        if (usbd_get_quirks(sc->sc_udev)->uq_flags & UQ_ASSUME_CM_OVER_DATA) {
                sc->sc_cm_over_data = 1;
        } else {
                if (sc->sc_cm_cap & USB_CDC_CM_OVER_DATA) {
                        if (sc->sc_acm_cap & USB_CDC_ACM_HAS_FEATURE)
                                err = umodem_set_comm_feature(sc,
                                    UCDC_ABSTRACT_STATE, UCDC_DATA_MULTIPLEXED);
                        else
                                err = 0;
                        if (err) {
                                aprint_error_dev(self,
                                    "could not set data multiplex mode\n");
                                goto bad;
                        }
                        sc->sc_cm_over_data = 1;
                }
        }

        /*
         * The standard allows for notification messages (to indicate things
         * like a modem hangup) to come in via an interrupt endpoint
         * off of the control interface.  Iterate over the endpoints on
         * the control interface and see if there are any interrupt
         * endpoints; if there are, then register it.
         */

        sc->sc_ctl_notify = -1;
        sc->sc_notify_pipe = NULL;

        id = usbd_get_interface_descriptor(sc->sc_ctl_iface);
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(sc->sc_ctl_iface, i);
                if (ed == NULL)
                        continue;

                if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                    (ed->bmAttributes & UE_XFERTYPE) == UE_INTERRUPT) {
                        aprint_verbose_dev(self,
                            "status change notification available\n");
                        sc->sc_ctl_notify = ed->bEndpointAddress;
                }
        }

        sc->sc_dtr = -1;

        /*
         * ucaa_bulkin, ucaa_bulkout set above.  ucaa_ibufsize,
         * ucaa_ibufsize, ucaa_obufsize may be initialised by caller
         */
        if (ucaa->ucaa_ibufsize == 0)
                ucaa->ucaa_ibufsize = UMODEMIBUFSIZE;
        if (ucaa->ucaa_obufsize == 0)
                ucaa->ucaa_obufsize = UMODEMOBUFSIZE;
        if (ucaa->ucaa_ibufsizepad == 0)
                ucaa->ucaa_ibufsizepad = UMODEMIBUFSIZE;
        ucaa->ucaa_opkthdrlen = 0;
        ucaa->ucaa_device = sc->sc_udev;
        ucaa->ucaa_iface = sc->sc_data_iface;
        ucaa->ucaa_arg = sc;

        /*
         * Each port takes two interfaces (control and data).
         *
         * If no port number is assigned by the specific driver,
         * use the interface to compute a logical port number.
         */
        if (ucaa->ucaa_portno == UCOM_UNK_PORTNO)
                ucaa->ucaa_portno = uiaa->uiaa_iface->ui_index / 2;

        usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev, sc->sc_dev);

        DPRINTF(("umodem_common_attach: sc=%p\n", sc));
        sc->sc_subdev = config_found(self, ucaa, ucomprint,
            CFARGS(.submatch = ucomsubmatch));

        return 0;

 bad:
        sc->sc_dying = true;
        return 1;
}

int
umodem_open(void *addr, int portno)
{
        struct umodem_softc *sc = addr;
        int err;

        if (sc->sc_dying)
                return EIO;

        DPRINTF(("umodem_open: sc=%p\n", sc));

        if (sc->sc_ctl_notify != -1 && sc->sc_notify_pipe == NULL) {
                err = usbd_open_pipe_intr(sc->sc_ctl_iface, sc->sc_ctl_notify,
                    USBD_SHORT_XFER_OK, &sc->sc_notify_pipe, sc,
                    &sc->sc_notify_buf, sizeof(sc->sc_notify_buf),
                    umodem_intr, USBD_DEFAULT_INTERVAL);

                if (err) {
                        DPRINTF(("Failed to establish notify pipe: %s\n",
                                usbd_errstr(err)));
                        return EIO;
                }
        }

        return 0;
}

static void
umodem_close_pipe(struct umodem_softc *sc)
{

        if (sc->sc_notify_pipe != NULL) {
                usbd_abort_pipe(sc->sc_notify_pipe);
                usbd_close_pipe(sc->sc_notify_pipe);
                sc->sc_notify_pipe = NULL;
        }
}

void
umodem_close(void *addr, int portno)
{
        struct umodem_softc *sc = addr;

        DPRINTF(("umodem_close: sc=%p\n", sc));

        if (sc->sc_dying)
                return;

        umodem_close_pipe(sc);
}

static void
umodem_intr(struct usbd_xfer *xfer, void *priv,
    usbd_status status)
{
        struct umodem_softc *sc = priv;
        u_char mstatus;

        if (sc->sc_dying)
                return;

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
                        return;
                printf("%s: abnormal status: %s\n", device_xname(sc->sc_dev),
                       usbd_errstr(status));
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->sc_notify_pipe);
                return;
        }

        if (sc->sc_notify_buf.bmRequestType != UCDC_NOTIFICATION) {
                DPRINTF(("%s: unknown message type (%02x) on notify pipe\n",
                         device_xname(sc->sc_dev),
                         sc->sc_notify_buf.bmRequestType));
                return;
        }

        switch (sc->sc_notify_buf.bNotification) {
        case UCDC_N_SERIAL_STATE:
                /*
                 * Set the serial state in ucom driver based on
                 * the bits from the notify message
                 */
                if (UGETW(sc->sc_notify_buf.wLength) != 2) {
                        printf("%s: Invalid notification length! (%d)\n",
                               device_xname(sc->sc_dev),
                               UGETW(sc->sc_notify_buf.wLength));
                        break;
                }
                DPRINTF(("%s: notify bytes = %02x%02x\n",
                         device_xname(sc->sc_dev),
                         sc->sc_notify_buf.data[0],
                         sc->sc_notify_buf.data[1]));
                /* Currently, lsr is always zero. */
                sc->sc_lsr = sc->sc_msr = 0;
                mstatus = sc->sc_notify_buf.data[0];

                if (ISSET(mstatus, UCDC_N_SERIAL_RI))
                        sc->sc_msr |= UMSR_RI;
                if (ISSET(mstatus, UCDC_N_SERIAL_DSR))
                        sc->sc_msr |= UMSR_DSR;
                if (ISSET(mstatus, UCDC_N_SERIAL_DCD))
                        sc->sc_msr |= UMSR_DCD;
                ucom_status_change(device_private(sc->sc_subdev));
                break;
        default:
                DPRINTF(("%s: unknown notify message: %02x\n",
                         device_xname(sc->sc_dev),
                         sc->sc_notify_buf.bNotification));
                break;
        }
}

int
umodem_get_caps(struct usbd_device *dev, int *cm, int *acm,
                usb_interface_descriptor_t *id)
{
        const usb_cdc_cm_descriptor_t *cmd;
        const usb_cdc_acm_descriptor_t *cad;
        const usb_cdc_union_descriptor_t *cud;
        uint32_t uq_flags;

        *cm = *acm = 0;
        uq_flags = usbd_get_quirks(dev)->uq_flags;

        if (uq_flags & UQ_NO_UNION_NRM) {
                DPRINTF(("umodem_get_caps: NO_UNION_NRM quirk - returning 0\n"));
                return 0;
        }

        if (uq_flags & UQ_LOST_CS_DESC)
                id = NULL;

        cmd = (const usb_cdc_cm_descriptor_t *)usb_find_desc_if(dev,
                                                          UDESC_CS_INTERFACE,
                                                          UDESCSUB_CDC_CM, id);
        if (cmd == NULL) {
                DPRINTF(("umodem_get_caps: no CM desc\n"));
        } else {
                *cm = cmd->bmCapabilities;
        }

        cad = (const usb_cdc_acm_descriptor_t *)usb_find_desc_if(dev,
                                                           UDESC_CS_INTERFACE,
                                                           UDESCSUB_CDC_ACM,
                                                           id);
        if (cad == NULL) {
                DPRINTF(("umodem_get_caps: no ACM desc\n"));
        } else {
                *acm = cad->bmCapabilities;
        }

        cud = (const usb_cdc_union_descriptor_t *)usb_find_desc_if(dev,
                                                             UDESC_CS_INTERFACE,
                                                             UDESCSUB_CDC_UNION,
                                                             id);
        if (cud == NULL) {
                DPRINTF(("umodem_get_caps: no UNION desc\n"));
        }

        return cmd ? cmd->bDataInterface : cud ? cud->bSlaveInterface[0] : -1;
}

void
umodem_get_status(void *addr, int portno, u_char *lsr, u_char *msr)
{
        struct umodem_softc *sc = addr;

        DPRINTF(("umodem_get_status:\n"));

        *lsr = sc->sc_lsr;
        *msr = sc->sc_msr;
}

int
umodem_param(void *addr, int portno, struct termios *t)
{
        struct umodem_softc *sc = addr;
        usbd_status err;
        usb_cdc_line_state_t ls;

        DPRINTF(("umodem_param: sc=%p\n", sc));

        if (sc->sc_dying)
                return EIO;

        USETDW(ls.dwDTERate, t->c_ospeed);
        if (ISSET(t->c_cflag, CSTOPB))
                ls.bCharFormat = UCDC_STOP_BIT_2;
        else
                ls.bCharFormat = UCDC_STOP_BIT_1;
        if (ISSET(t->c_cflag, PARENB)) {
                if (ISSET(t->c_cflag, PARODD))
                        ls.bParityType = UCDC_PARITY_ODD;
                else
                        ls.bParityType = UCDC_PARITY_EVEN;
        } else
                ls.bParityType = UCDC_PARITY_NONE;
        switch (ISSET(t->c_cflag, CSIZE)) {
        case CS5:
                ls.bDataBits = 5;
                break;
        case CS6:
                ls.bDataBits = 6;
                break;
        case CS7:
                ls.bDataBits = 7;
                break;
        case CS8:
                ls.bDataBits = 8;
                break;
        }

        err = umodem_set_line_coding(sc, &ls);
        if (err) {
                DPRINTF(("umodem_param: err=%s\n", usbd_errstr(err)));
                return EPASSTHROUGH;
        }
        return 0;
}

int
umodem_ioctl(void *addr, int portno, u_long cmd, void *data,
    int flag, proc_t *p)
{
        struct umodem_softc *sc = addr;
        int error = 0;

        DPRINTF(("umodem_ioctl: cmd=0x%08lx\n", cmd));

        if (sc->sc_dying)
                return EIO;

        switch (cmd) {
        case USB_GET_CM_OVER_DATA:
                *(int *)data = sc->sc_cm_over_data;
                break;

        case USB_SET_CM_OVER_DATA:
                if (*(int *)data != sc->sc_cm_over_data) {
                        /* XXX change it */
                }
                break;

        default:
                DPRINTF(("umodem_ioctl: unknown\n"));
                error = EPASSTHROUGH;
                break;
        }

        return error;
}

static void
umodem_dtr(struct umodem_softc *sc, int onoff)
{
        DPRINTF(("umodem_dtr: onoff=%d\n", onoff));

        if (sc->sc_dtr == onoff)
                return;
        sc->sc_dtr = onoff;

        umodem_set_line_state(sc);
}

static void
umodem_rts(struct umodem_softc *sc, int onoff)
{
        DPRINTF(("umodem_rts: onoff=%d\n", onoff));

        if (sc->sc_rts == onoff)
                return;
        sc->sc_rts = onoff;

        umodem_set_line_state(sc);
}

static void
umodem_set_line_state(struct umodem_softc *sc)
{
        usb_device_request_t req;
        int ls;

        ls = (sc->sc_dtr ? UCDC_LINE_DTR : 0) |
             (sc->sc_rts ? UCDC_LINE_RTS : 0);
        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
        req.bRequest = UCDC_SET_CONTROL_LINE_STATE;
        USETW(req.wValue, ls);
        USETW(req.wIndex, sc->sc_ctl_iface_no);
        USETW(req.wLength, 0);

        (void)usbd_do_request(sc->sc_udev, &req, 0);

}

static void
umodem_break(struct umodem_softc *sc, int onoff)
{
        usb_device_request_t req;

        DPRINTF(("umodem_break: onoff=%d\n", onoff));

        if (!(sc->sc_acm_cap & USB_CDC_ACM_HAS_BREAK))
                return;

        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
        req.bRequest = UCDC_SEND_BREAK;
        USETW(req.wValue, onoff ? UCDC_BREAK_ON : UCDC_BREAK_OFF);
        USETW(req.wIndex, sc->sc_ctl_iface_no);
        USETW(req.wLength, 0);

        (void)usbd_do_request(sc->sc_udev, &req, 0);
}

void
umodem_set(void *addr, int portno, int reg, int onoff)
{
        struct umodem_softc *sc = addr;

        if (sc->sc_dying)
                return;

        switch (reg) {
        case UCOM_SET_DTR:
                umodem_dtr(sc, onoff);
                break;
        case UCOM_SET_RTS:
                umodem_rts(sc, onoff);
                break;
        case UCOM_SET_BREAK:
                umodem_break(sc, onoff);
                break;
        default:
                break;
        }
}

static usbd_status
umodem_set_line_coding(struct umodem_softc *sc, usb_cdc_line_state_t *state)
{
        usb_device_request_t req;
        usbd_status err;

        DPRINTF(("umodem_set_line_coding: rate=%d fmt=%d parity=%d bits=%d\n",
                 UGETDW(state->dwDTERate), state->bCharFormat,
                 state->bParityType, state->bDataBits));

        if (memcmp(state, &sc->sc_line_state, UCDC_LINE_STATE_LENGTH) == 0) {
                DPRINTF(("umodem_set_line_coding: already set\n"));
                return USBD_NORMAL_COMPLETION;
        }

        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
        req.bRequest = UCDC_SET_LINE_CODING;
        USETW(req.wValue, 0);
        USETW(req.wIndex, sc->sc_ctl_iface_no);
        USETW(req.wLength, UCDC_LINE_STATE_LENGTH);

        err = usbd_do_request(sc->sc_udev, &req, state);
        if (err) {
                DPRINTF(("umodem_set_line_coding: failed, err=%s\n",
                         usbd_errstr(err)));
                return err;
        }

        sc->sc_line_state = *state;

        return USBD_NORMAL_COMPLETION;
}

static usbd_status
umodem_set_comm_feature(struct umodem_softc *sc, int feature, int state)
{
        usb_device_request_t req;
        usbd_status err;
        usb_cdc_abstract_state_t ast;

        DPRINTF(("umodem_set_comm_feature: feature=%d state=%d\n", feature,
                 state));

        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
        req.bRequest = UCDC_SET_COMM_FEATURE;
        USETW(req.wValue, feature);
        USETW(req.wIndex, sc->sc_ctl_iface_no);
        USETW(req.wLength, UCDC_ABSTRACT_STATE_LENGTH);
        USETW(ast.wState, state);

        err = usbd_do_request(sc->sc_udev, &req, &ast);
        if (err) {
                DPRINTF(("umodem_set_comm_feature: feature=%d, err=%s\n",
                         feature, usbd_errstr(err)));
                return err;
        }

        return USBD_NORMAL_COMPLETION;
}

void
umodem_common_childdet(struct umodem_softc *sc, device_t child)
{
        KASSERT(sc->sc_subdev == child);
        sc->sc_subdev = NULL;
}

int
umodem_common_detach(struct umodem_softc *sc, int flags)
{
        int rv = 0;

        DPRINTF(("umodem_common_detach: sc=%p flags=%d\n", sc, flags));

        sc->sc_dying = true;

        umodem_close_pipe(sc);

        if (sc->sc_subdev != NULL) {
                rv = config_detach(sc->sc_subdev, flags);
                sc->sc_subdev = NULL;
        }

        usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev);

        return rv;
}