/*      $NetBSD: umodem.c,v 1.45 2002/09/23 05:51:23 simonb Exp $       */

#define UFOMA_HANDSFREE
/*-
 * Copyright (c) 2005, Takanori Watanabe
 * Copyright (c) 2003, M. Warner Losh <imp@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.
 */

/*-
 * 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:
 * - Implement a Call Device for modems without multiplexed commands.
 */

/*
 * NOTE: all function names beginning like "ufoma_cfg_" can only
 * be called from within the config thread function !
 */

#include <sys/stdint.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/condvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/caps.h>
#include <sys/sbuf.h>
#include <sys/serial.h>

#include <bus/u4b/usb.h>
#include <bus/u4b/usbdi.h>
#include <bus/u4b/usbdi_util.h>
#include <bus/u4b/usb_cdc.h>
#include "usbdevs.h"

#define USB_DEBUG_VAR usb_debug
#include <bus/u4b/usb_debug.h>
#include <bus/u4b/usb_process.h>

#include <bus/u4b/serial/usb_serial.h>

typedef struct ufoma_mobile_acm_descriptor {
        uint8_t bFunctionLength;
        uint8_t bDescriptorType;
        uint8_t bDescriptorSubtype;
        uint8_t bType;
        uint8_t bMode[1];
} __packed usb_mcpc_acm_descriptor;

#define UISUBCLASS_MCPC 0x88

#define UDESC_VS_INTERFACE 0x44
#define UDESCSUB_MCPC_ACM  0x11

#define UMCPC_ACM_TYPE_AB1 0x1
#define UMCPC_ACM_TYPE_AB2 0x2
#define UMCPC_ACM_TYPE_AB5 0x5
#define UMCPC_ACM_TYPE_AB6 0x6

#define UMCPC_ACM_MODE_DEACTIVATED 0x0
#define UMCPC_ACM_MODE_MODEM 0x1
#define UMCPC_ACM_MODE_ATCOMMAND 0x2
#define UMCPC_ACM_MODE_OBEX 0x60
#define UMCPC_ACM_MODE_VENDOR1 0xc0
#define UMCPC_ACM_MODE_VENDOR2 0xfe
#define UMCPC_ACM_MODE_UNLINKED 0xff

#define UMCPC_CM_MOBILE_ACM 0x0

#define UMCPC_ACTIVATE_MODE 0x60
#define UMCPC_GET_MODETABLE 0x61
#define UMCPC_SET_LINK 0x62
#define UMCPC_CLEAR_LINK 0x63

#define UMCPC_REQUEST_ACKNOWLEDGE 0x31

#define UFOMA_MAX_TIMEOUT 15            /* standard says 10 seconds */
#define UFOMA_CMD_BUF_SIZE 64           /* bytes */

#define UFOMA_BULK_BUF_SIZE 1024        /* bytes */

enum {
        UFOMA_CTRL_ENDPT_INTR,
        UFOMA_CTRL_ENDPT_READ,
        UFOMA_CTRL_ENDPT_WRITE,
        UFOMA_CTRL_ENDPT_MAX,
};

enum {
        UFOMA_BULK_ENDPT_WRITE,
        UFOMA_BULK_ENDPT_READ,
        UFOMA_BULK_ENDPT_MAX,
};

struct ufoma_softc {
        struct ucom_super_softc sc_super_ucom;
        struct ucom_softc sc_ucom;
        struct cv sc_cv;
        struct lock sc_lock;

        struct usb_xfer *sc_ctrl_xfer[UFOMA_CTRL_ENDPT_MAX];
        struct usb_xfer *sc_bulk_xfer[UFOMA_BULK_ENDPT_MAX];
        uint8_t *sc_modetable;
        device_t sc_dev;
        struct usb_device *sc_udev;

        uint32_t sc_unit;

        uint16_t sc_line;

        uint8_t sc_num_msg;
        uint8_t sc_nobulk;
        uint8_t sc_ctrl_iface_no;
        uint8_t sc_ctrl_iface_index;
        uint8_t sc_data_iface_no;
        uint8_t sc_data_iface_index;
        uint8_t sc_cm_cap;
        uint8_t sc_acm_cap;
        uint8_t sc_lsr;
        uint8_t sc_msr;
        uint8_t sc_modetoactivate;
        uint8_t sc_currentmode;
        uint8_t sc_name[16];
};

/* prototypes */

static device_probe_t ufoma_probe;
static device_attach_t ufoma_attach;
static device_detach_t ufoma_detach;

static usb_callback_t ufoma_ctrl_read_callback;
static usb_callback_t ufoma_ctrl_write_callback;
static usb_callback_t ufoma_intr_callback;
static usb_callback_t ufoma_bulk_write_callback;
static usb_callback_t ufoma_bulk_read_callback;

static void     *ufoma_get_intconf(struct usb_config_descriptor *,
                    struct usb_interface_descriptor *, uint8_t, uint8_t);
static void     ufoma_cfg_link_state(struct ufoma_softc *);
static void     ufoma_cfg_activate_state(struct ufoma_softc *, uint16_t);
static void     ufoma_cfg_open(struct ucom_softc *);
static void     ufoma_cfg_close(struct ucom_softc *);
static void     ufoma_cfg_set_break(struct ucom_softc *, uint8_t);
static void     ufoma_cfg_get_status(struct ucom_softc *, uint8_t *,
                    uint8_t *);
static void     ufoma_cfg_set_dtr(struct ucom_softc *, uint8_t);
static void     ufoma_cfg_set_rts(struct ucom_softc *, uint8_t);
static int      ufoma_pre_param(struct ucom_softc *, struct termios *);
static void     ufoma_cfg_param(struct ucom_softc *, struct termios *);
static int      ufoma_modem_setup(device_t, struct ufoma_softc *,
                    struct usb_attach_arg *);
static void     ufoma_start_read(struct ucom_softc *);
static void     ufoma_stop_read(struct ucom_softc *);
static void     ufoma_start_write(struct ucom_softc *);
static void     ufoma_stop_write(struct ucom_softc *);
static void     ufoma_poll(struct ucom_softc *ucom);

/*sysctl stuff*/
static int ufoma_sysctl_support(SYSCTL_HANDLER_ARGS);
static int ufoma_sysctl_current(SYSCTL_HANDLER_ARGS);
static int ufoma_sysctl_open(SYSCTL_HANDLER_ARGS);

static const struct usb_config
        ufoma_ctrl_config[UFOMA_CTRL_ENDPT_MAX] = {

        [UFOMA_CTRL_ENDPT_INTR] = {
                .type = UE_INTERRUPT,
                .endpoint = UE_ADDR_ANY,
                .direction = UE_DIR_IN,
                .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
                .bufsize = sizeof(struct usb_cdc_notification),
                .callback = &ufoma_intr_callback,
        },

        [UFOMA_CTRL_ENDPT_READ] = {
                .type = UE_CONTROL,
                .endpoint = 0x00,       /* Control pipe */
                .direction = UE_DIR_ANY,
                .bufsize = (sizeof(struct usb_device_request) + UFOMA_CMD_BUF_SIZE),
                .flags = {.short_xfer_ok = 1,},
                .callback = &ufoma_ctrl_read_callback,
                .timeout = 1000,        /* 1 second */
        },

        [UFOMA_CTRL_ENDPT_WRITE] = {
                .type = UE_CONTROL,
                .endpoint = 0x00,       /* Control pipe */
                .direction = UE_DIR_ANY,
                .bufsize = (sizeof(struct usb_device_request) + 1),
                .callback = &ufoma_ctrl_write_callback,
                .timeout = 1000,        /* 1 second */
        },
};

static const struct usb_config
        ufoma_bulk_config[UFOMA_BULK_ENDPT_MAX] = {

        [UFOMA_BULK_ENDPT_WRITE] = {
                .type = UE_BULK,
                .endpoint = UE_ADDR_ANY,
                .direction = UE_DIR_OUT,
                .bufsize = UFOMA_BULK_BUF_SIZE,
                .flags = {.pipe_bof = 1,.force_short_xfer = 1,},
                .callback = &ufoma_bulk_write_callback,
        },

        [UFOMA_BULK_ENDPT_READ] = {
                .type = UE_BULK,
                .endpoint = UE_ADDR_ANY,
                .direction = UE_DIR_IN,
                .bufsize = UFOMA_BULK_BUF_SIZE,
                .flags = {.pipe_bof = 1,.short_xfer_ok = 1,},
                .callback = &ufoma_bulk_read_callback,
        },
};

static const struct ucom_callback ufoma_callback = {
        .ucom_cfg_get_status = &ufoma_cfg_get_status,
        .ucom_cfg_set_dtr = &ufoma_cfg_set_dtr,
        .ucom_cfg_set_rts = &ufoma_cfg_set_rts,
        .ucom_cfg_set_break = &ufoma_cfg_set_break,
        .ucom_cfg_param = &ufoma_cfg_param,
        .ucom_cfg_open = &ufoma_cfg_open,
        .ucom_cfg_close = &ufoma_cfg_close,
        .ucom_pre_param = &ufoma_pre_param,
        .ucom_start_read = &ufoma_start_read,
        .ucom_stop_read = &ufoma_stop_read,
        .ucom_start_write = &ufoma_start_write,
        .ucom_stop_write = &ufoma_stop_write,
        .ucom_poll = &ufoma_poll,
};

static device_method_t ufoma_methods[] = {
        /* Device methods */
        DEVMETHOD(device_probe, ufoma_probe),
        DEVMETHOD(device_attach, ufoma_attach),
        DEVMETHOD(device_detach, ufoma_detach),
        DEVMETHOD_END
};

static devclass_t ufoma_devclass;

static driver_t ufoma_driver = {
        .name = "ufoma",
        .methods = ufoma_methods,
        .size = sizeof(struct ufoma_softc),
};

static const STRUCT_USB_HOST_ID ufoma_devs[] = {
        {USB_IFACE_CLASS(UICLASS_CDC),
         USB_IFACE_SUBCLASS(UISUBCLASS_MCPC),},
};

DRIVER_MODULE(ufoma, uhub, ufoma_driver, ufoma_devclass, NULL, NULL);
MODULE_DEPEND(ufoma, ucom, 1, 1, 1);
MODULE_DEPEND(ufoma, usb, 1, 1, 1);
MODULE_VERSION(ufoma, 1);

static int
ufoma_probe(device_t dev)
{
        struct usb_attach_arg *uaa = device_get_ivars(dev);
        struct usb_interface_descriptor *id;
        struct usb_config_descriptor *cd;
        usb_mcpc_acm_descriptor *mad;
        int error;

        if (uaa->usb_mode != USB_MODE_HOST)
                return (ENXIO);

        error = usbd_lookup_id_by_uaa(ufoma_devs, sizeof(ufoma_devs), uaa);
        if (error)
                return (error);

        id = usbd_get_interface_descriptor(uaa->iface);
        cd = usbd_get_config_descriptor(uaa->device);

        if (id == NULL || cd == NULL)
                return (ENXIO);

        mad = ufoma_get_intconf(cd, id, UDESC_VS_INTERFACE, UDESCSUB_MCPC_ACM);
        if (mad == NULL)
                return (ENXIO);

#ifndef UFOMA_HANDSFREE
        if ((mad->bType == UMCPC_ACM_TYPE_AB5) ||
            (mad->bType == UMCPC_ACM_TYPE_AB6))
                return (ENXIO);
#endif
        return (BUS_PROBE_GENERIC);
}

static int
ufoma_attach(device_t dev)
{
        struct usb_attach_arg *uaa = device_get_ivars(dev);
        struct ufoma_softc *sc = device_get_softc(dev);
        struct usb_config_descriptor *cd;
        struct usb_interface_descriptor *id;
        struct sysctl_ctx_list *sctx;
        struct sysctl_oid *soid;

        usb_mcpc_acm_descriptor *mad;
        uint8_t elements;
        int32_t error;

        sc->sc_udev = uaa->device;
        sc->sc_dev = dev;
        sc->sc_unit = device_get_unit(dev);

        lockinit(&sc->sc_lock, "ufoma", 0, LK_CANRECURSE);
        cv_init(&sc->sc_cv, "CWAIT");

        device_set_usb_desc(dev);

        ksnprintf(sc->sc_name, sizeof(sc->sc_name),
            "%s", device_get_nameunit(dev));

        DPRINTF("\n");

        /* setup control transfers */

        cd = usbd_get_config_descriptor(uaa->device);
        id = usbd_get_interface_descriptor(uaa->iface);
        sc->sc_ctrl_iface_no = id->bInterfaceNumber;
        sc->sc_ctrl_iface_index = uaa->info.bIfaceIndex;

        error = usbd_transfer_setup(uaa->device,
            &sc->sc_ctrl_iface_index, sc->sc_ctrl_xfer,
            ufoma_ctrl_config, UFOMA_CTRL_ENDPT_MAX, sc, &sc->sc_lock);

        if (error) {
                device_printf(dev, "allocating control USB "
                    "transfers failed\n");
                goto detach;
        }
        mad = ufoma_get_intconf(cd, id, UDESC_VS_INTERFACE, UDESCSUB_MCPC_ACM);
        if (mad == NULL) {
                goto detach;
        }
        if (mad->bFunctionLength < sizeof(*mad)) {
                device_printf(dev, "invalid MAD descriptor\n");
                goto detach;
        }
        if ((mad->bType == UMCPC_ACM_TYPE_AB5) ||
            (mad->bType == UMCPC_ACM_TYPE_AB6)) {
                sc->sc_nobulk = 1;
        } else {
                sc->sc_nobulk = 0;
                if (ufoma_modem_setup(dev, sc, uaa)) {
                        goto detach;
                }
        }

        elements = (mad->bFunctionLength - sizeof(*mad) + 1);

        /* initialize mode variables */

        sc->sc_modetable = kmalloc(elements + 1, M_USBDEV, M_WAITOK);

        if (sc->sc_modetable == NULL) {
                goto detach;
        }
        sc->sc_modetable[0] = (elements + 1);
        memcpy(&sc->sc_modetable[1], mad->bMode, elements);

        sc->sc_currentmode = UMCPC_ACM_MODE_UNLINKED;
        sc->sc_modetoactivate = mad->bMode[0];

        /* clear stall at first run, if any */
        lockmgr(&sc->sc_lock, LK_EXCLUSIVE);
        usbd_xfer_set_stall(sc->sc_bulk_xfer[UFOMA_BULK_ENDPT_WRITE]);
        usbd_xfer_set_stall(sc->sc_bulk_xfer[UFOMA_BULK_ENDPT_READ]);
        lockmgr(&sc->sc_lock, LK_RELEASE);

        error = ucom_attach(&sc->sc_super_ucom, &sc->sc_ucom, 1, sc,
            &ufoma_callback, &sc->sc_lock);
        if (error) {
                DPRINTF("ucom_attach failed\n");
                goto detach;
        }
        ucom_set_pnpinfo_usb(&sc->sc_super_ucom, dev);

        /*Sysctls*/
        sctx = device_get_sysctl_ctx(dev);
        soid = device_get_sysctl_tree(dev);

        SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "supportmode",
                        CTLFLAG_RD|CTLTYPE_STRING, sc, 0, ufoma_sysctl_support,
                        "A", "Supporting port role");

        SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "currentmode",
                        CTLFLAG_RD|CTLTYPE_STRING, sc, 0, ufoma_sysctl_current,
                        "A", "Current port role");

        SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "openmode",
                        CTLFLAG_RW|CTLTYPE_STRING, sc, 0, ufoma_sysctl_open,
                        "A", "Mode to transit when port is opened");
        SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "comunit",
                        CTLFLAG_RD, &(sc->sc_super_ucom.sc_unit), 0, 
                        "Unit number as USB serial");

        return (0);                     /* success */

detach:
        ufoma_detach(dev);
        return (ENXIO);                 /* failure */
}

static int
ufoma_detach(device_t dev)
{
        struct ufoma_softc *sc = device_get_softc(dev);

        ucom_detach(&sc->sc_super_ucom, &sc->sc_ucom);
        usbd_transfer_unsetup(sc->sc_ctrl_xfer, UFOMA_CTRL_ENDPT_MAX);
        usbd_transfer_unsetup(sc->sc_bulk_xfer, UFOMA_BULK_ENDPT_MAX);

        if (sc->sc_modetable) {
                kfree(sc->sc_modetable, M_USBDEV);
        }
        lockuninit(&sc->sc_lock);
        cv_destroy(&sc->sc_cv);

        return (0);
}

static void *
ufoma_get_intconf(struct usb_config_descriptor *cd, struct usb_interface_descriptor *id,
    uint8_t type, uint8_t subtype)
{
        struct usb_descriptor *desc = (void *)id;

        while ((desc = usb_desc_foreach(cd, desc))) {

                if (desc->bDescriptorType == UDESC_INTERFACE) {
                        return (NULL);
                }
                if ((desc->bDescriptorType == type) &&
                    (desc->bDescriptorSubtype == subtype)) {
                        break;
                }
        }
        return (desc);
}

static void
ufoma_cfg_link_state(struct ufoma_softc *sc)
{
        struct usb_device_request req;
        int32_t error;

        req.bmRequestType = UT_WRITE_VENDOR_INTERFACE;
        req.bRequest = UMCPC_SET_LINK;
        USETW(req.wValue, UMCPC_CM_MOBILE_ACM);
        USETW(req.wIndex, sc->sc_ctrl_iface_no);
        USETW(req.wLength, sc->sc_modetable[0]);

        ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
            &req, sc->sc_modetable, 0, 1000);

        error = cv_timedwait(&sc->sc_cv, &sc->sc_lock, hz);

        if (error) {
                DPRINTF("NO response\n");
        }
}

static void
ufoma_cfg_activate_state(struct ufoma_softc *sc, uint16_t state)
{
        struct usb_device_request req;
        int32_t error;

        req.bmRequestType = UT_WRITE_VENDOR_INTERFACE;
        req.bRequest = UMCPC_ACTIVATE_MODE;
        USETW(req.wValue, state);
        USETW(req.wIndex, sc->sc_ctrl_iface_no);
        USETW(req.wLength, 0);

        ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
            &req, NULL, 0, 1000);

        error = cv_timedwait(&sc->sc_cv, &sc->sc_lock,
            (UFOMA_MAX_TIMEOUT * hz));
        if (error) {
                DPRINTF("No response\n");
        }
}

static void
ufoma_ctrl_read_callback(struct usb_xfer *xfer, usb_error_t error)
{
        struct ufoma_softc *sc = usbd_xfer_softc(xfer);
        struct usb_device_request req;
        struct usb_page_cache *pc0, *pc1;
        int len, aframes, nframes;

        usbd_xfer_status(xfer, NULL, NULL, &aframes, &nframes);

        switch (USB_GET_STATE(xfer)) {
        case USB_ST_TRANSFERRED:
tr_transferred:
                if (aframes != nframes)
                        goto tr_setup;
                pc1 = usbd_xfer_get_frame(xfer, 1);
                len = usbd_xfer_frame_len(xfer, 1);
                if (len > 0)
                        ucom_put_data(&sc->sc_ucom, pc1, 0, len);
                /* FALLTHROUGH */
        case USB_ST_SETUP:
tr_setup:
                if (sc->sc_num_msg) {
                        sc->sc_num_msg--;

                        req.bmRequestType = UT_READ_CLASS_INTERFACE;
                        req.bRequest = UCDC_GET_ENCAPSULATED_RESPONSE;
                        USETW(req.wIndex, sc->sc_ctrl_iface_no);
                        USETW(req.wValue, 0);
                        USETW(req.wLength, UFOMA_CMD_BUF_SIZE);

                        pc0 = usbd_xfer_get_frame(xfer, 0);
                        usbd_copy_in(pc0, 0, &req, sizeof(req));

                        usbd_xfer_set_frame_len(xfer, 0, sizeof(req));
                        usbd_xfer_set_frame_len(xfer, 1, UFOMA_CMD_BUF_SIZE);
                        usbd_xfer_set_frames(xfer, 2);
                        usbd_transfer_submit(xfer);
                }
                return;

        default:                        /* Error */
                DPRINTF("error = %s\n",
                    usbd_errstr(error));

                if (error == USB_ERR_CANCELLED) {
                        return;
                } else {
                        goto tr_setup;
                }

                goto tr_transferred;
        }
}

static void
ufoma_ctrl_write_callback(struct usb_xfer *xfer, usb_error_t error)
{
        struct ufoma_softc *sc = usbd_xfer_softc(xfer);
        struct usb_device_request req;
        struct usb_page_cache *pc;
        uint32_t actlen;

        switch (USB_GET_STATE(xfer)) {
        case USB_ST_TRANSFERRED:
tr_transferred:
        case USB_ST_SETUP:
tr_setup:
                pc = usbd_xfer_get_frame(xfer, 1);
                if (ucom_get_data(&sc->sc_ucom, pc, 0, 1, &actlen)) {

                        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
                        req.bRequest = UCDC_SEND_ENCAPSULATED_COMMAND;
                        USETW(req.wIndex, sc->sc_ctrl_iface_no);
                        USETW(req.wValue, 0);
                        USETW(req.wLength, 1);

                        pc = usbd_xfer_get_frame(xfer, 0);
                        usbd_copy_in(pc, 0, &req, sizeof(req));

                        usbd_xfer_set_frame_len(xfer, 0, sizeof(req));
                        usbd_xfer_set_frame_len(xfer, 1, 1);
                        usbd_xfer_set_frames(xfer, 2);

                        usbd_transfer_submit(xfer);
                }
                return;

        default:                        /* Error */
                DPRINTF("error = %s\n", usbd_errstr(error));

                if (error == USB_ERR_CANCELLED) {
                        return;
                } else {
                        goto tr_setup;
                }

                goto tr_transferred;
        }
}

static void
ufoma_intr_callback(struct usb_xfer *xfer, usb_error_t error)
{
        struct ufoma_softc *sc = usbd_xfer_softc(xfer);
        struct usb_cdc_notification pkt;
        struct usb_page_cache *pc;
        uint16_t wLen;
        uint16_t temp;
        uint8_t mstatus;
        int actlen;

        usbd_xfer_status(xfer, &actlen, NULL, NULL, NULL);

        switch (USB_GET_STATE(xfer)) {
        case USB_ST_TRANSFERRED:
                if (actlen < 8) {
                        DPRINTF("too short message\n");
                        goto tr_setup;
                }
                if (actlen > sizeof(pkt)) {
                        DPRINTF("truncating message\n");
                        actlen = sizeof(pkt);
                }
                pc = usbd_xfer_get_frame(xfer, 0);
                usbd_copy_out(pc, 0, &pkt, actlen);

                actlen -= 8;

                wLen = UGETW(pkt.wLength);
                if (actlen > wLen) {
                        actlen = wLen;
                }
                if ((pkt.bmRequestType == UT_READ_VENDOR_INTERFACE) &&
                    (pkt.bNotification == UMCPC_REQUEST_ACKNOWLEDGE)) {
                        temp = UGETW(pkt.wValue);
                        sc->sc_currentmode = (temp >> 8);
                        if (!(temp & 0xff)) {
                                DPRINTF("Mode change failed!\n");
                        }
                        cv_signal(&sc->sc_cv);
                }
                if (pkt.bmRequestType != UCDC_NOTIFICATION) {
                        goto tr_setup;
                }
                switch (pkt.bNotification) {
                case UCDC_N_RESPONSE_AVAILABLE:
                        if (!(sc->sc_nobulk)) {
                                DPRINTF("Wrong serial state!\n");
                                break;
                        }
                        if (sc->sc_num_msg != 0xFF) {
                                sc->sc_num_msg++;
                        }
                        usbd_transfer_start(sc->sc_ctrl_xfer[UFOMA_CTRL_ENDPT_READ]);
                        break;

                case UCDC_N_SERIAL_STATE:
                        if (sc->sc_nobulk) {
                                DPRINTF("Wrong serial state!\n");
                                break;
                        }
                        /*
                         * Set the serial state in ucom driver based on
                         * the bits from the notify message
                         */
                        if (actlen < 2) {
                                DPRINTF("invalid notification "
                                    "length, %d bytes!\n", actlen);
                                break;
                        }
                        DPRINTF("notify bytes = 0x%02x, 0x%02x\n",
                            pkt.data[0], pkt.data[1]);

                        /* currently, lsr is always zero. */
                        sc->sc_lsr = 0;
                        sc->sc_msr = 0;

                        mstatus = pkt.data[0];

                        if (mstatus & UCDC_N_SERIAL_RI) {
                                sc->sc_msr |= SER_RI;
                        }
                        if (mstatus & UCDC_N_SERIAL_DSR) {
                                sc->sc_msr |= SER_DSR;
                        }
                        if (mstatus & UCDC_N_SERIAL_DCD) {
                                sc->sc_msr |= SER_DCD;
                        }
                        ucom_status_change(&sc->sc_ucom);
                        break;

                default:
                        break;
                }

        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
ufoma_bulk_write_callback(struct usb_xfer *xfer, usb_error_t error)
{
        struct ufoma_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,
                    UFOMA_BULK_BUF_SIZE, &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
ufoma_bulk_read_callback(struct usb_xfer *xfer, usb_error_t error)
{
        struct ufoma_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
ufoma_cfg_open(struct ucom_softc *ucom)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        /* empty input queue */

        if (sc->sc_num_msg != 0xFF) {
                sc->sc_num_msg++;
        }
        if (sc->sc_currentmode == UMCPC_ACM_MODE_UNLINKED) {
                ufoma_cfg_link_state(sc);
        }
        if (sc->sc_currentmode == UMCPC_ACM_MODE_DEACTIVATED) {
                ufoma_cfg_activate_state(sc, sc->sc_modetoactivate);
        }
}

static void
ufoma_cfg_close(struct ucom_softc *ucom)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        ufoma_cfg_activate_state(sc, UMCPC_ACM_MODE_DEACTIVATED);
}

static void
ufoma_cfg_set_break(struct ucom_softc *ucom, uint8_t onoff)
{
        struct ufoma_softc *sc = ucom->sc_parent;
        struct usb_device_request req;
        uint16_t wValue;

        if (sc->sc_nobulk ||
            (sc->sc_currentmode == UMCPC_ACM_MODE_OBEX)) {
                return;
        }
        if (!(sc->sc_acm_cap & USB_CDC_ACM_HAS_BREAK)) {
                return;
        }
        wValue = onoff ? UCDC_BREAK_ON : UCDC_BREAK_OFF;

        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
        req.bRequest = UCDC_SEND_BREAK;
        USETW(req.wValue, wValue);
        req.wIndex[0] = sc->sc_ctrl_iface_no;
        req.wIndex[1] = 0;
        USETW(req.wLength, 0);

        ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
            &req, NULL, 0, 1000);
}

static void
ufoma_cfg_get_status(struct ucom_softc *ucom, uint8_t *lsr, uint8_t *msr)
{
        struct ufoma_softc *sc = ucom->sc_parent;

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

static void
ufoma_cfg_set_line_state(struct ufoma_softc *sc)
{
        struct usb_device_request req;

        /* Don't send line state emulation request for OBEX port */
        if (sc->sc_currentmode == UMCPC_ACM_MODE_OBEX) {
                return;
        }
        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
        req.bRequest = UCDC_SET_CONTROL_LINE_STATE;
        USETW(req.wValue, sc->sc_line);
        req.wIndex[0] = sc->sc_ctrl_iface_no;
        req.wIndex[1] = 0;
        USETW(req.wLength, 0);

        ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
            &req, NULL, 0, 1000);
}

static void
ufoma_cfg_set_dtr(struct ucom_softc *ucom, uint8_t onoff)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        if (sc->sc_nobulk) {
                return;
        }
        if (onoff)
                sc->sc_line |= UCDC_LINE_DTR;
        else
                sc->sc_line &= ~UCDC_LINE_DTR;

        ufoma_cfg_set_line_state(sc);
}

static void
ufoma_cfg_set_rts(struct ucom_softc *ucom, uint8_t onoff)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        if (sc->sc_nobulk) {
                return;
        }
        if (onoff)
                sc->sc_line |= UCDC_LINE_RTS;
        else
                sc->sc_line &= ~UCDC_LINE_RTS;

        ufoma_cfg_set_line_state(sc);
}

static int
ufoma_pre_param(struct ucom_softc *ucom, struct termios *t)
{
        return (0);                     /* we accept anything */
}

static void
ufoma_cfg_param(struct ucom_softc *ucom, struct termios *t)
{
        struct ufoma_softc *sc = ucom->sc_parent;
        struct usb_device_request req;
        struct usb_cdc_line_state ls;

        if (sc->sc_nobulk ||
            (sc->sc_currentmode == UMCPC_ACM_MODE_OBEX)) {
                return;
        }
        DPRINTF("\n");

        memset(&ls, 0, sizeof(ls));

        USETDW(ls.dwDTERate, t->c_ospeed);

        if (t->c_cflag & CSTOPB) {
                ls.bCharFormat = UCDC_STOP_BIT_2;
        } else {
                ls.bCharFormat = UCDC_STOP_BIT_1;
        }

        if (t->c_cflag & PARENB) {
                if (t->c_cflag & PARODD) {
                        ls.bParityType = UCDC_PARITY_ODD;
                } else {
                        ls.bParityType = UCDC_PARITY_EVEN;
                }
        } else {
                ls.bParityType = UCDC_PARITY_NONE;
        }

        switch (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;
        }

        req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
        req.bRequest = UCDC_SET_LINE_CODING;
        USETW(req.wValue, 0);
        req.wIndex[0] = sc->sc_ctrl_iface_no;
        req.wIndex[1] = 0;
        USETW(req.wLength, UCDC_LINE_STATE_LENGTH);

        ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
            &req, &ls, 0, 1000);
}

static int
ufoma_modem_setup(device_t dev, struct ufoma_softc *sc,
    struct usb_attach_arg *uaa)
{
        struct usb_config_descriptor *cd;
        struct usb_cdc_acm_descriptor *acm;
        struct usb_cdc_cm_descriptor *cmd;
        struct usb_interface_descriptor *id;
        struct usb_interface *iface;
        uint8_t i;
        int32_t error;

        cd = usbd_get_config_descriptor(uaa->device);
        id = usbd_get_interface_descriptor(uaa->iface);

        cmd = ufoma_get_intconf(cd, id, UDESC_CS_INTERFACE, UDESCSUB_CDC_CM);

        if ((cmd == NULL) ||
            (cmd->bLength < sizeof(*cmd))) {
                return (EINVAL);
        }
        sc->sc_cm_cap = cmd->bmCapabilities;
        sc->sc_data_iface_no = cmd->bDataInterface;

        acm = ufoma_get_intconf(cd, id, UDESC_CS_INTERFACE, UDESCSUB_CDC_ACM);

        if ((acm == NULL) ||
            (acm->bLength < sizeof(*acm))) {
                return (EINVAL);
        }
        sc->sc_acm_cap = acm->bmCapabilities;

        device_printf(dev, "data interface %d, has %sCM over data, "
            "has %sbreak\n",
            sc->sc_data_iface_no,
            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++) {

                iface = usbd_get_iface(uaa->device, i);

                if (iface) {

                        id = usbd_get_interface_descriptor(iface);

                        if (id && (id->bInterfaceNumber == sc->sc_data_iface_no)) {
                                sc->sc_data_iface_index = i;
                                usbd_set_parent_iface(uaa->device, i, uaa->info.bIfaceIndex);
                                break;
                        }
                } else {
                        device_printf(dev, "no data interface\n");
                        return (EINVAL);
                }
        }

        error = usbd_transfer_setup(uaa->device,
            &sc->sc_data_iface_index, sc->sc_bulk_xfer,
            ufoma_bulk_config, UFOMA_BULK_ENDPT_MAX, sc, &sc->sc_lock);

        if (error) {
                device_printf(dev, "allocating BULK USB "
                    "transfers failed\n");
                return (EINVAL);
        }
        return (0);
}

static void
ufoma_start_read(struct ucom_softc *ucom)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        /* start interrupt transfer */
        usbd_transfer_start(sc->sc_ctrl_xfer[UFOMA_CTRL_ENDPT_INTR]);

        /* start data transfer */
        if (sc->sc_nobulk) {
                usbd_transfer_start(sc->sc_ctrl_xfer[UFOMA_CTRL_ENDPT_READ]);
        } else {
                usbd_transfer_start(sc->sc_bulk_xfer[UFOMA_BULK_ENDPT_READ]);
        }
}

static void
ufoma_stop_read(struct ucom_softc *ucom)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        /* stop interrupt transfer */
        usbd_transfer_stop(sc->sc_ctrl_xfer[UFOMA_CTRL_ENDPT_INTR]);

        /* stop data transfer */
        if (sc->sc_nobulk) {
                usbd_transfer_stop(sc->sc_ctrl_xfer[UFOMA_CTRL_ENDPT_READ]);
        } else {
                usbd_transfer_stop(sc->sc_bulk_xfer[UFOMA_BULK_ENDPT_READ]);
        }
}

static void
ufoma_start_write(struct ucom_softc *ucom)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        if (sc->sc_nobulk) {
                usbd_transfer_start(sc->sc_ctrl_xfer[UFOMA_CTRL_ENDPT_WRITE]);
        } else {
                usbd_transfer_start(sc->sc_bulk_xfer[UFOMA_BULK_ENDPT_WRITE]);
        }
}

static void
ufoma_stop_write(struct ucom_softc *ucom)
{
        struct ufoma_softc *sc = ucom->sc_parent;

        if (sc->sc_nobulk) {
                usbd_transfer_stop(sc->sc_ctrl_xfer[UFOMA_CTRL_ENDPT_WRITE]);
        } else {
                usbd_transfer_stop(sc->sc_bulk_xfer[UFOMA_BULK_ENDPT_WRITE]);
        }
}

static struct umcpc_modetostr_tab{
        int mode;
        char *str;
}umcpc_modetostr_tab[]={
        {UMCPC_ACM_MODE_DEACTIVATED, "deactivated"},
        {UMCPC_ACM_MODE_MODEM, "modem"},
        {UMCPC_ACM_MODE_ATCOMMAND, "handsfree"},
        {UMCPC_ACM_MODE_OBEX, "obex"},
        {UMCPC_ACM_MODE_VENDOR1, "vendor1"},
        {UMCPC_ACM_MODE_VENDOR2, "vendor2"},
        {UMCPC_ACM_MODE_UNLINKED, "unlinked"},
        {0, NULL}
};

static char *ufoma_mode_to_str(int mode)
{
        int i;
        for(i = 0 ;umcpc_modetostr_tab[i].str != NULL; i++){
                if(umcpc_modetostr_tab[i].mode == mode){
                        return umcpc_modetostr_tab[i].str;
                }
        }
        return NULL;
}

static int ufoma_str_to_mode(char *str)
{
        int i;
        for(i = 0 ;umcpc_modetostr_tab[i].str != NULL; i++){
                if(strcmp(str, umcpc_modetostr_tab[i].str)==0){
                        return umcpc_modetostr_tab[i].mode;
                }
        }
        return -1;
}

static int ufoma_sysctl_support(SYSCTL_HANDLER_ARGS)
{
        struct ufoma_softc *sc = (struct ufoma_softc *)oidp->oid_arg1;
        struct sbuf sb;
        int i;
        char *mode;

        sbuf_new(&sb, NULL, 1, SBUF_AUTOEXTEND);
        for(i = 1; i < sc->sc_modetable[0]; i++){
                mode = ufoma_mode_to_str(sc->sc_modetable[i]);
                if(mode !=NULL){
                        sbuf_cat(&sb, mode);
                }else{
                        sbuf_printf(&sb, "(%02x)", sc->sc_modetable[i]);
                }
                if(i < (sc->sc_modetable[0]-1))
                        sbuf_cat(&sb, ",");
        }
        sbuf_trim(&sb);
        sbuf_finish(&sb);
        sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
        sbuf_delete(&sb);

        return 0;
}
static int ufoma_sysctl_current(SYSCTL_HANDLER_ARGS)
{
        struct ufoma_softc *sc = (struct ufoma_softc *)oidp->oid_arg1;
        char *mode;
        char subbuf[]="(XXX)";
        mode = ufoma_mode_to_str(sc->sc_currentmode);
        if(!mode){
                mode = subbuf;
                ksnprintf(subbuf, sizeof(subbuf), "(%02x)", sc->sc_currentmode);
        }
        sysctl_handle_string(oidp, mode, strlen(mode), req);

        return 0;
}
static int ufoma_sysctl_open(SYSCTL_HANDLER_ARGS)
{
        struct ufoma_softc *sc = (struct ufoma_softc *)oidp->oid_arg1;
        char *mode;
        char subbuf[40];
        int newmode;
        int error;
        int i;

        mode = ufoma_mode_to_str(sc->sc_modetoactivate);
        if(mode){
                strncpy(subbuf, mode, sizeof(subbuf));
        }else{
                ksnprintf(subbuf, sizeof(subbuf), "(%02x)", sc->sc_modetoactivate);
        }
        error = sysctl_handle_string(oidp, subbuf, sizeof(subbuf), req);
        if(error != 0 || req->newptr == NULL){
                return error;
        }

        if((newmode = ufoma_str_to_mode(subbuf)) == -1){
                return EINVAL;
        }

        for(i = 1 ; i < sc->sc_modetable[0] ; i++){
                if(sc->sc_modetable[i] == newmode){
                        sc->sc_modetoactivate = newmode;
                        return 0;
                }
        }

        return EINVAL;
}

static void
ufoma_poll(struct ucom_softc *ucom)
{
        struct ufoma_softc *sc = ucom->sc_parent;
        usbd_transfer_poll(sc->sc_ctrl_xfer, UFOMA_CTRL_ENDPT_MAX);
        usbd_transfer_poll(sc->sc_bulk_xfer, UFOMA_BULK_ENDPT_MAX);
}