/* $NetBSD: ucom.c,v 1.40 2001/11/13 06:24:54 lukem Exp $ */ /*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2001-2003, 2005, 2008 * Shunsuke Akiyama . * 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 /*- * Copyright (c) 1998, 2000 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define USB_DEBUG_VAR ucom_debug #include #include #include #include #include "opt_gdb.h" static SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "USB ucom"); static int ucom_pps_mode; SYSCTL_INT(_hw_usb_ucom, OID_AUTO, pps_mode, CTLFLAG_RWTUN, &ucom_pps_mode, 0, "pulse capture mode: 0/1/2=disabled/CTS/DCD; add 0x10 to invert"); static int ucom_device_mode_console = 1; SYSCTL_INT(_hw_usb_ucom, OID_AUTO, device_mode_console, CTLFLAG_RW, &ucom_device_mode_console, 0, "set to 1 to mark terminals as consoles when in device mode"); #ifdef USB_DEBUG static int ucom_debug = 0; SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RWTUN, &ucom_debug, 0, "ucom debug level"); #endif #define UCOM_CONS_BUFSIZE 1024 static uint8_t ucom_cons_rx_buf[UCOM_CONS_BUFSIZE]; static uint8_t ucom_cons_tx_buf[UCOM_CONS_BUFSIZE]; static unsigned int ucom_cons_rx_low = 0; static unsigned int ucom_cons_rx_high = 0; static unsigned int ucom_cons_tx_low = 0; static unsigned int ucom_cons_tx_high = 0; static int ucom_cons_unit = -1; static int ucom_cons_subunit = 0; static int ucom_cons_baud = 9600; static struct ucom_softc *ucom_cons_softc = NULL; SYSCTL_INT(_hw_usb_ucom, OID_AUTO, cons_unit, CTLFLAG_RWTUN, &ucom_cons_unit, 0, "console unit number"); SYSCTL_INT(_hw_usb_ucom, OID_AUTO, cons_subunit, CTLFLAG_RWTUN, &ucom_cons_subunit, 0, "console subunit number"); SYSCTL_INT(_hw_usb_ucom, OID_AUTO, cons_baud, CTLFLAG_RWTUN, &ucom_cons_baud, 0, "console baud rate"); static usb_proc_callback_t ucom_cfg_start_transfers; static usb_proc_callback_t ucom_cfg_open; static usb_proc_callback_t ucom_cfg_close; static usb_proc_callback_t ucom_cfg_line_state; static usb_proc_callback_t ucom_cfg_status_change; static usb_proc_callback_t ucom_cfg_param; static int ucom_unit_alloc(void); static void ucom_unit_free(int); static int ucom_attach_tty(struct ucom_super_softc *, struct ucom_softc *); static void ucom_detach_tty(struct ucom_super_softc *, struct ucom_softc *); static void ucom_queue_command(struct ucom_softc *, usb_proc_callback_t *, struct termios *pt, struct usb_proc_msg *t0, struct usb_proc_msg *t1); static void ucom_shutdown(struct ucom_softc *); static void ucom_ring(struct ucom_softc *, uint8_t); static void ucom_break(struct ucom_softc *, uint8_t); static void ucom_dtr(struct ucom_softc *, uint8_t); static void ucom_rts(struct ucom_softc *, uint8_t); static tsw_open_t ucom_open; static tsw_close_t ucom_close; static tsw_ioctl_t ucom_ioctl; static tsw_modem_t ucom_modem; static tsw_param_t ucom_param; static tsw_outwakeup_t ucom_outwakeup; static tsw_inwakeup_t ucom_inwakeup; static tsw_free_t ucom_free; static tsw_busy_t ucom_busy; static struct ttydevsw ucom_class = { .tsw_flags = TF_INITLOCK | TF_CALLOUT, .tsw_open = ucom_open, .tsw_close = ucom_close, .tsw_outwakeup = ucom_outwakeup, .tsw_inwakeup = ucom_inwakeup, .tsw_ioctl = ucom_ioctl, .tsw_param = ucom_param, .tsw_modem = ucom_modem, .tsw_free = ucom_free, .tsw_busy = ucom_busy, }; MODULE_DEPEND(ucom, usb, 1, 1, 1); MODULE_VERSION(ucom, 1); #define UCOM_UNIT_MAX 128 /* maximum number of units */ #define UCOM_TTY_PREFIX "U" static struct unrhdr *ucom_unrhdr; static struct mtx ucom_mtx; static int ucom_close_refs; static void ucom_init(void *arg) { DPRINTF("\n"); ucom_unrhdr = new_unrhdr(0, UCOM_UNIT_MAX - 1, NULL); mtx_init(&ucom_mtx, "UCOM MTX", NULL, MTX_DEF); } SYSINIT(ucom_init, SI_SUB_KLD - 1, SI_ORDER_ANY, ucom_init, NULL); static void ucom_uninit(void *arg) { struct unrhdr *hdr; hdr = ucom_unrhdr; ucom_unrhdr = NULL; DPRINTF("\n"); if (hdr != NULL) delete_unrhdr(hdr); mtx_destroy(&ucom_mtx); } SYSUNINIT(ucom_uninit, SI_SUB_KLD - 3, SI_ORDER_ANY, ucom_uninit, NULL); /* * Mark a unit number (the X in cuaUX) as in use. * * Note that devices using a different naming scheme (see ucom_tty_name() * callback) still use this unit allocation. */ static int ucom_unit_alloc(void) { int unit; /* sanity checks */ if (ucom_unrhdr == NULL) { DPRINTF("ucom_unrhdr is NULL\n"); return (-1); } unit = alloc_unr(ucom_unrhdr); DPRINTF("unit %d is allocated\n", unit); return (unit); } /* * Mark the unit number as not in use. */ static void ucom_unit_free(int unit) { /* sanity checks */ if (unit < 0 || unit >= UCOM_UNIT_MAX || ucom_unrhdr == NULL) { DPRINTF("cannot free unit number\n"); return; } DPRINTF("unit %d is freed\n", unit); free_unr(ucom_unrhdr, unit); } /* * Setup a group of one or more serial ports. * * The mutex pointed to by "mtx" is applied before all * callbacks are called back. Also "mtx" must be applied * before calling into the ucom-layer! */ int ucom_attach(struct ucom_super_softc *ssc, struct ucom_softc *sc, int subunits, void *parent, const struct ucom_callback *callback, struct mtx *mtx) { int subunit; int error = 0; if ((sc == NULL) || (subunits <= 0) || (callback == NULL) || (mtx == NULL)) { return (EINVAL); } /* allocate a uniq unit number */ ssc->sc_unit = ucom_unit_alloc(); if (ssc->sc_unit == -1) return (ENOMEM); /* generate TTY name string */ snprintf(ssc->sc_ttyname, sizeof(ssc->sc_ttyname), UCOM_TTY_PREFIX "%d", ssc->sc_unit); /* create USB request handling process */ error = usb_proc_create(&ssc->sc_tq, mtx, "ucom", USB_PRI_MED); if (error) { ucom_unit_free(ssc->sc_unit); return (error); } ssc->sc_subunits = subunits; ssc->sc_flag = UCOM_FLAG_ATTACHED | UCOM_FLAG_FREE_UNIT | (ssc->sc_flag & UCOM_FLAG_DEVICE_MODE); if (callback->ucom_free == NULL) ssc->sc_flag |= UCOM_FLAG_WAIT_REFS; /* increment reference count */ ucom_ref(ssc); for (subunit = 0; subunit < ssc->sc_subunits; subunit++) { sc[subunit].sc_subunit = subunit; sc[subunit].sc_super = ssc; sc[subunit].sc_mtx = mtx; sc[subunit].sc_parent = parent; sc[subunit].sc_callback = callback; error = ucom_attach_tty(ssc, &sc[subunit]); if (error) { ucom_detach(ssc, &sc[0]); return (error); } /* increment reference count */ ucom_ref(ssc); /* set subunit attached */ sc[subunit].sc_flag |= UCOM_FLAG_ATTACHED; } DPRINTF("tp = %p, unit = %d, subunits = %d\n", sc->sc_tty, ssc->sc_unit, ssc->sc_subunits); return (0); } /* * The following function will do nothing if the structure pointed to * by "ssc" and "sc" is zero or has already been detached. */ void ucom_detach(struct ucom_super_softc *ssc, struct ucom_softc *sc) { int subunit; if (!(ssc->sc_flag & UCOM_FLAG_ATTACHED)) return; /* not initialized */ if (ssc->sc_sysctl_ttyname != NULL) { sysctl_remove_oid(ssc->sc_sysctl_ttyname, 1, 0); ssc->sc_sysctl_ttyname = NULL; } if (ssc->sc_sysctl_ttyports != NULL) { sysctl_remove_oid(ssc->sc_sysctl_ttyports, 1, 0); ssc->sc_sysctl_ttyports = NULL; } usb_proc_drain(&ssc->sc_tq); for (subunit = 0; subunit < ssc->sc_subunits; subunit++) { if (sc[subunit].sc_flag & UCOM_FLAG_ATTACHED) { ucom_detach_tty(ssc, &sc[subunit]); /* avoid duplicate detach */ sc[subunit].sc_flag &= ~UCOM_FLAG_ATTACHED; } } usb_proc_free(&ssc->sc_tq); ucom_unref(ssc); if (ssc->sc_flag & UCOM_FLAG_WAIT_REFS) ucom_drain(ssc); /* make sure we don't detach twice */ ssc->sc_flag &= ~UCOM_FLAG_ATTACHED; } void ucom_drain(struct ucom_super_softc *ssc) { mtx_lock(&ucom_mtx); while (ssc->sc_refs > 0) { printf("ucom: Waiting for a TTY device to close.\n"); usb_pause_mtx(&ucom_mtx, hz); } mtx_unlock(&ucom_mtx); } void ucom_drain_all(void *arg) { mtx_lock(&ucom_mtx); while (ucom_close_refs > 0) { printf("ucom: Waiting for all detached TTY " "devices to have open fds closed.\n"); usb_pause_mtx(&ucom_mtx, hz); } mtx_unlock(&ucom_mtx); } static cn_probe_t ucom_cnprobe; static cn_init_t ucom_cninit; static cn_term_t ucom_cnterm; static cn_getc_t ucom_cngetc; static cn_putc_t ucom_cnputc; static cn_grab_t ucom_cngrab; static cn_ungrab_t ucom_cnungrab; const struct consdev_ops ucom_cnops = { .cn_probe = ucom_cnprobe, .cn_init = ucom_cninit, .cn_term = ucom_cnterm, .cn_getc = ucom_cngetc, .cn_putc = ucom_cnputc, .cn_grab = ucom_cngrab, .cn_ungrab = ucom_cnungrab, }; static int ucom_attach_tty(struct ucom_super_softc *ssc, struct ucom_softc *sc) { struct tty *tp; char buf[32]; /* temporary TTY device name buffer */ tp = tty_alloc_mutex(&ucom_class, sc, sc->sc_mtx); if (tp == NULL) return (ENOMEM); /* Check if the client has a custom TTY name */ buf[0] = '\0'; if (sc->sc_callback->ucom_tty_name) { sc->sc_callback->ucom_tty_name(sc, buf, sizeof(buf), ssc->sc_unit, sc->sc_subunit); } if (buf[0] == 0) { /* Use default TTY name */ if (ssc->sc_subunits > 1) { /* multiple modems in one */ snprintf(buf, sizeof(buf), UCOM_TTY_PREFIX "%u.%u", ssc->sc_unit, sc->sc_subunit); } else { /* single modem */ snprintf(buf, sizeof(buf), UCOM_TTY_PREFIX "%u", ssc->sc_unit); } } tty_makedev(tp, NULL, "%s", buf); sc->sc_tty = tp; sc->sc_pps.ppscap = PPS_CAPTUREBOTH; sc->sc_pps.driver_abi = PPS_ABI_VERSION; sc->sc_pps.driver_mtx = sc->sc_mtx; pps_init_abi(&sc->sc_pps); DPRINTF("ttycreate: %s\n", buf); /* Check if this device should be a console */ if ((ucom_cons_softc == NULL) && (ssc->sc_unit == ucom_cons_unit) && (sc->sc_subunit == ucom_cons_subunit)) { DPRINTF("unit %d subunit %d is console", ssc->sc_unit, sc->sc_subunit); ucom_cons_softc = sc; tty_init_console(tp, ucom_cons_baud); UCOM_MTX_LOCK(ucom_cons_softc); ucom_cons_rx_low = 0; ucom_cons_rx_high = 0; ucom_cons_tx_low = 0; ucom_cons_tx_high = 0; sc->sc_flag |= UCOM_FLAG_CONSOLE; ucom_open(ucom_cons_softc->sc_tty); ucom_param(ucom_cons_softc->sc_tty, &tp->t_termios_init_in); UCOM_MTX_UNLOCK(ucom_cons_softc); } if ((ssc->sc_flag & UCOM_FLAG_DEVICE_MODE) != 0 && ucom_device_mode_console > 0 && ucom_cons_softc == NULL) { struct consdev *cp; cp = malloc(sizeof(struct consdev), M_USBDEV, M_WAITOK|M_ZERO); cp->cn_ops = &ucom_cnops; cp->cn_arg = NULL; cp->cn_pri = CN_NORMAL; strlcpy(cp->cn_name, "tty", sizeof(cp->cn_name)); strlcat(cp->cn_name, buf, sizeof(cp->cn_name)); sc->sc_consdev = cp; cnadd(cp); } return (0); } static void ucom_detach_tty(struct ucom_super_softc *ssc, struct ucom_softc *sc) { struct tty *tp = sc->sc_tty; DPRINTF("sc = %p, tp = %p\n", sc, sc->sc_tty); if (sc->sc_consdev != NULL) { cnremove(sc->sc_consdev); free(sc->sc_consdev, M_USBDEV); sc->sc_consdev = NULL; } if (sc->sc_flag & UCOM_FLAG_CONSOLE) { UCOM_MTX_LOCK(ucom_cons_softc); ucom_close(ucom_cons_softc->sc_tty); sc->sc_flag &= ~UCOM_FLAG_CONSOLE; UCOM_MTX_UNLOCK(ucom_cons_softc); ucom_cons_softc = NULL; } /* the config thread has been stopped when we get here */ UCOM_MTX_LOCK(sc); sc->sc_flag |= UCOM_FLAG_GONE; sc->sc_flag &= ~(UCOM_FLAG_HL_READY | UCOM_FLAG_LL_READY); UCOM_MTX_UNLOCK(sc); if (tp) { mtx_lock(&ucom_mtx); ucom_close_refs++; mtx_unlock(&ucom_mtx); tty_lock(tp); ucom_close(tp); /* close, if any */ tty_rel_gone(tp); UCOM_MTX_LOCK(sc); /* * make sure that read and write transfers are stopped */ if (sc->sc_callback->ucom_stop_read) (sc->sc_callback->ucom_stop_read) (sc); if (sc->sc_callback->ucom_stop_write) (sc->sc_callback->ucom_stop_write) (sc); UCOM_MTX_UNLOCK(sc); } } void ucom_set_pnpinfo_usb(struct ucom_super_softc *ssc, device_t dev) { char buf[64]; uint8_t iface_index; struct usb_attach_arg *uaa; snprintf(buf, sizeof(buf), "ttyname=" UCOM_TTY_PREFIX "%d ttyports=%d", ssc->sc_unit, ssc->sc_subunits); /* Store the PNP info in the first interface for the device */ uaa = device_get_ivars(dev); iface_index = uaa->info.bIfaceIndex; if (usbd_set_pnpinfo(uaa->device, iface_index, buf) != 0) device_printf(dev, "Could not set PNP info\n"); /* * The following information is also replicated in the PNP-info * string which is registered above: */ if (ssc->sc_sysctl_ttyname == NULL) { ssc->sc_sysctl_ttyname = SYSCTL_ADD_STRING(NULL, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "ttyname", CTLFLAG_RD, ssc->sc_ttyname, 0, "TTY device basename"); } if (ssc->sc_sysctl_ttyports == NULL) { ssc->sc_sysctl_ttyports = SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "ttyports", CTLFLAG_RD, NULL, ssc->sc_subunits, "Number of ports"); } } void ucom_set_usb_mode(struct ucom_super_softc *ssc, enum usb_hc_mode usb_mode) { switch (usb_mode) { case USB_MODE_DEVICE: ssc->sc_flag |= UCOM_FLAG_DEVICE_MODE; break; default: ssc->sc_flag &= ~UCOM_FLAG_DEVICE_MODE; break; } } static void ucom_queue_command(struct ucom_softc *sc, usb_proc_callback_t *fn, struct termios *pt, struct usb_proc_msg *t0, struct usb_proc_msg *t1) { struct ucom_super_softc *ssc = sc->sc_super; struct ucom_param_task *task; UCOM_MTX_ASSERT(sc, MA_OWNED); if (usb_proc_is_gone(&ssc->sc_tq)) { DPRINTF("proc is gone\n"); return; /* nothing to do */ } /* * NOTE: The task cannot get executed before we drop the * "sc_mtx" mutex. It is safe to update fields in the message * structure after that the message got queued. */ task = (struct ucom_param_task *) usb_proc_msignal(&ssc->sc_tq, t0, t1); /* Setup callback and softc pointers */ task->hdr.pm_callback = fn; task->sc = sc; /* * Make a copy of the termios. This field is only present if * the "pt" field is not NULL. */ if (pt != NULL) task->termios_copy = *pt; /* * Closing or opening the device should be synchronous. */ if (fn == ucom_cfg_close || fn == ucom_cfg_open) usb_proc_mwait(&ssc->sc_tq, t0, t1); /* * In case of multiple configure requests, * keep track of the last one! */ if (fn == ucom_cfg_start_transfers) sc->sc_last_start_xfer = &task->hdr; } static void ucom_shutdown(struct ucom_softc *sc) { struct tty *tp = sc->sc_tty; UCOM_MTX_ASSERT(sc, MA_OWNED); DPRINTF("\n"); /* * Hang up if necessary: */ if (tp->t_termios.c_cflag & HUPCL) { ucom_modem(tp, 0, SER_DTR); } } /* * Return values: * 0: normal * else: taskqueue is draining or gone */ uint8_t ucom_cfg_is_gone(struct ucom_softc *sc) { struct ucom_super_softc *ssc = sc->sc_super; return (usb_proc_is_gone(&ssc->sc_tq)); } static void ucom_cfg_start_transfers(struct usb_proc_msg *_task) { struct ucom_cfg_task *task = (struct ucom_cfg_task *)_task; struct ucom_softc *sc = task->sc; if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { return; } if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { /* TTY device closed */ return; } if (_task == sc->sc_last_start_xfer) sc->sc_flag |= UCOM_FLAG_GP_DATA; if (sc->sc_callback->ucom_start_read) { (sc->sc_callback->ucom_start_read) (sc); } if (sc->sc_callback->ucom_start_write) { (sc->sc_callback->ucom_start_write) (sc); } } static void ucom_start_transfers(struct ucom_softc *sc) { if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { return; } /* * Make sure that data transfers are started in both * directions: */ if (sc->sc_callback->ucom_start_read) { (sc->sc_callback->ucom_start_read) (sc); } if (sc->sc_callback->ucom_start_write) { (sc->sc_callback->ucom_start_write) (sc); } } static void ucom_cfg_open(struct usb_proc_msg *_task) { struct ucom_cfg_task *task = (struct ucom_cfg_task *)_task; struct ucom_softc *sc = task->sc; DPRINTF("\n"); if (sc->sc_flag & UCOM_FLAG_LL_READY) { /* already opened */ } else { sc->sc_flag |= UCOM_FLAG_LL_READY; if (sc->sc_callback->ucom_cfg_open) { (sc->sc_callback->ucom_cfg_open) (sc); /* wait a little */ usb_pause_mtx(sc->sc_mtx, hz / 10); } } } static int ucom_open(struct tty *tp) { struct ucom_softc *sc = tty_softc(tp); int error; UCOM_MTX_ASSERT(sc, MA_OWNED); if (sc->sc_flag & UCOM_FLAG_GONE) { return (ENXIO); } if (sc->sc_flag & UCOM_FLAG_HL_READY) { /* already opened */ return (0); } DPRINTF("tp = %p\n", tp); if (sc->sc_callback->ucom_pre_open) { /* * give the lower layer a chance to disallow TTY open, for * example if the device is not present: */ error = (sc->sc_callback->ucom_pre_open) (sc); if (error) { return (error); } } sc->sc_flag |= UCOM_FLAG_HL_READY; /* Disable transfers */ sc->sc_flag &= ~UCOM_FLAG_GP_DATA; sc->sc_lsr = 0; sc->sc_msr = 0; sc->sc_mcr = 0; /* reset programmed line state */ sc->sc_pls_curr = 0; sc->sc_pls_set = 0; sc->sc_pls_clr = 0; /* reset jitter buffer */ sc->sc_jitterbuf_in = 0; sc->sc_jitterbuf_out = 0; ucom_queue_command(sc, ucom_cfg_open, NULL, &sc->sc_open_task[0].hdr, &sc->sc_open_task[1].hdr); /* Queue transfer enable command last */ ucom_queue_command(sc, ucom_cfg_start_transfers, NULL, &sc->sc_start_task[0].hdr, &sc->sc_start_task[1].hdr); if (sc->sc_tty == NULL || (sc->sc_tty->t_termios.c_cflag & CNO_RTSDTR) == 0) ucom_modem(tp, SER_DTR | SER_RTS, 0); ucom_ring(sc, 0); ucom_break(sc, 0); ucom_status_change(sc); return (0); } static void ucom_cfg_close(struct usb_proc_msg *_task) { struct ucom_cfg_task *task = (struct ucom_cfg_task *)_task; struct ucom_softc *sc = task->sc; DPRINTF("\n"); if (sc->sc_flag & UCOM_FLAG_LL_READY) { sc->sc_flag &= ~UCOM_FLAG_LL_READY; if (sc->sc_callback->ucom_cfg_close) (sc->sc_callback->ucom_cfg_close) (sc); } else { /* already closed */ } } static void ucom_close(struct tty *tp) { struct ucom_softc *sc = tty_softc(tp); UCOM_MTX_ASSERT(sc, MA_OWNED); DPRINTF("tp=%p\n", tp); if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { DPRINTF("tp=%p already closed\n", tp); return; } ucom_shutdown(sc); ucom_queue_command(sc, ucom_cfg_close, NULL, &sc->sc_close_task[0].hdr, &sc->sc_close_task[1].hdr); sc->sc_flag &= ~(UCOM_FLAG_HL_READY | UCOM_FLAG_RTS_IFLOW); if (sc->sc_callback->ucom_stop_read) { (sc->sc_callback->ucom_stop_read) (sc); } } static void ucom_inwakeup(struct tty *tp) { struct ucom_softc *sc = tty_softc(tp); uint16_t pos; if (sc == NULL) return; UCOM_MTX_ASSERT(sc, MA_OWNED); DPRINTF("tp=%p\n", tp); if (ttydisc_can_bypass(tp) != 0 || (sc->sc_flag & UCOM_FLAG_HL_READY) == 0 || (sc->sc_flag & UCOM_FLAG_INWAKEUP) != 0) { return; } /* prevent recursion */ sc->sc_flag |= UCOM_FLAG_INWAKEUP; pos = sc->sc_jitterbuf_out; while (sc->sc_jitterbuf_in != pos) { int c; c = (char)sc->sc_jitterbuf[pos]; if (ttydisc_rint(tp, c, 0) == -1) break; pos++; if (pos >= UCOM_JITTERBUF_SIZE) pos -= UCOM_JITTERBUF_SIZE; } sc->sc_jitterbuf_out = pos; /* clear RTS in async fashion */ if ((sc->sc_jitterbuf_in == pos) && (sc->sc_flag & UCOM_FLAG_RTS_IFLOW)) ucom_rts(sc, 0); sc->sc_flag &= ~UCOM_FLAG_INWAKEUP; } static int ucom_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td) { struct ucom_softc *sc = tty_softc(tp); int error; UCOM_MTX_ASSERT(sc, MA_OWNED); if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { return (EIO); } DPRINTF("cmd = 0x%08lx\n", cmd); switch (cmd) { #if 0 case TIOCSRING: ucom_ring(sc, 1); error = 0; break; case TIOCCRING: ucom_ring(sc, 0); error = 0; break; #endif case TIOCSBRK: ucom_break(sc, 1); error = 0; break; case TIOCCBRK: ucom_break(sc, 0); error = 0; break; default: if (sc->sc_callback->ucom_ioctl) { error = (sc->sc_callback->ucom_ioctl) (sc, cmd, data, 0, td); } else { error = ENOIOCTL; } if (error == ENOIOCTL) error = pps_ioctl(cmd, data, &sc->sc_pps); break; } return (error); } static int ucom_modem(struct tty *tp, int sigon, int sigoff) { struct ucom_softc *sc = tty_softc(tp); uint8_t onoff; UCOM_MTX_ASSERT(sc, MA_OWNED); if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { return (0); } if ((sigon == 0) && (sigoff == 0)) { if (sc->sc_mcr & SER_DTR) { sigon |= SER_DTR; } if (sc->sc_mcr & SER_RTS) { sigon |= SER_RTS; } if (sc->sc_msr & SER_CTS) { sigon |= SER_CTS; } if (sc->sc_msr & SER_DCD) { sigon |= SER_DCD; } if (sc->sc_msr & SER_DSR) { sigon |= SER_DSR; } if (sc->sc_msr & SER_RI) { sigon |= SER_RI; } return (sigon); } if (sigon & SER_DTR) { sc->sc_mcr |= SER_DTR; } if (sigoff & SER_DTR) { sc->sc_mcr &= ~SER_DTR; } if (sigon & SER_RTS) { sc->sc_mcr |= SER_RTS; } if (sigoff & SER_RTS) { sc->sc_mcr &= ~SER_RTS; } onoff = (sc->sc_mcr & SER_DTR) ? 1 : 0; ucom_dtr(sc, onoff); onoff = (sc->sc_mcr & SER_RTS) ? 1 : 0; ucom_rts(sc, onoff); return (0); } static void ucom_cfg_line_state(struct usb_proc_msg *_task) { struct ucom_cfg_task *task = (struct ucom_cfg_task *)_task; struct ucom_softc *sc = task->sc; uint8_t notch_bits; uint8_t any_bits; uint8_t prev_value; uint8_t last_value; uint8_t mask; if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { return; } mask = 0; /* compute callback mask */ if (sc->sc_callback->ucom_cfg_set_dtr) mask |= UCOM_LS_DTR; if (sc->sc_callback->ucom_cfg_set_rts) mask |= UCOM_LS_RTS; if (sc->sc_callback->ucom_cfg_set_break) mask |= UCOM_LS_BREAK; if (sc->sc_callback->ucom_cfg_set_ring) mask |= UCOM_LS_RING; /* compute the bits we are to program */ notch_bits = (sc->sc_pls_set & sc->sc_pls_clr) & mask; any_bits = (sc->sc_pls_set | sc->sc_pls_clr) & mask; prev_value = sc->sc_pls_curr ^ notch_bits; last_value = sc->sc_pls_curr; /* reset programmed line state */ sc->sc_pls_curr = 0; sc->sc_pls_set = 0; sc->sc_pls_clr = 0; /* ensure that we don't lose any levels */ if (notch_bits & UCOM_LS_DTR) sc->sc_callback->ucom_cfg_set_dtr(sc, (prev_value & UCOM_LS_DTR) ? 1 : 0); if (notch_bits & UCOM_LS_RTS) sc->sc_callback->ucom_cfg_set_rts(sc, (prev_value & UCOM_LS_RTS) ? 1 : 0); if (notch_bits & UCOM_LS_BREAK) sc->sc_callback->ucom_cfg_set_break(sc, (prev_value & UCOM_LS_BREAK) ? 1 : 0); if (notch_bits & UCOM_LS_RING) sc->sc_callback->ucom_cfg_set_ring(sc, (prev_value & UCOM_LS_RING) ? 1 : 0); /* set last value */ if (any_bits & UCOM_LS_DTR) sc->sc_callback->ucom_cfg_set_dtr(sc, (last_value & UCOM_LS_DTR) ? 1 : 0); if (any_bits & UCOM_LS_RTS) sc->sc_callback->ucom_cfg_set_rts(sc, (last_value & UCOM_LS_RTS) ? 1 : 0); if (any_bits & UCOM_LS_BREAK) sc->sc_callback->ucom_cfg_set_break(sc, (last_value & UCOM_LS_BREAK) ? 1 : 0); if (any_bits & UCOM_LS_RING) sc->sc_callback->ucom_cfg_set_ring(sc, (last_value & UCOM_LS_RING) ? 1 : 0); } static void ucom_line_state(struct ucom_softc *sc, uint8_t set_bits, uint8_t clear_bits) { UCOM_MTX_ASSERT(sc, MA_OWNED); if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { return; } DPRINTF("on=0x%02x, off=0x%02x\n", set_bits, clear_bits); /* update current programmed line state */ sc->sc_pls_curr |= set_bits; sc->sc_pls_curr &= ~clear_bits; sc->sc_pls_set |= set_bits; sc->sc_pls_clr |= clear_bits; /* defer driver programming */ ucom_queue_command(sc, ucom_cfg_line_state, NULL, &sc->sc_line_state_task[0].hdr, &sc->sc_line_state_task[1].hdr); } static void ucom_ring(struct ucom_softc *sc, uint8_t onoff) { DPRINTF("onoff = %d\n", onoff); if (onoff) ucom_line_state(sc, UCOM_LS_RING, 0); else ucom_line_state(sc, 0, UCOM_LS_RING); } static void ucom_break(struct ucom_softc *sc, uint8_t onoff) { DPRINTF("onoff = %d\n", onoff); if (onoff) ucom_line_state(sc, UCOM_LS_BREAK, 0); else ucom_line_state(sc, 0, UCOM_LS_BREAK); } static void ucom_dtr(struct ucom_softc *sc, uint8_t onoff) { DPRINTF("onoff = %d\n", onoff); if (onoff) ucom_line_state(sc, UCOM_LS_DTR, 0); else ucom_line_state(sc, 0, UCOM_LS_DTR); } static void ucom_rts(struct ucom_softc *sc, uint8_t onoff) { DPRINTF("onoff = %d\n", onoff); if (onoff) ucom_line_state(sc, UCOM_LS_RTS, 0); else ucom_line_state(sc, 0, UCOM_LS_RTS); } static void ucom_cfg_status_change(struct usb_proc_msg *_task) { struct ucom_cfg_task *task = (struct ucom_cfg_task *)_task; struct ucom_softc *sc = task->sc; struct tty *tp; int onoff; uint8_t new_msr; uint8_t new_lsr; uint8_t msr_delta; uint8_t lsr_delta; uint8_t pps_signal; tp = sc->sc_tty; UCOM_MTX_ASSERT(sc, MA_OWNED); if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { return; } if (sc->sc_callback->ucom_cfg_get_status == NULL) { return; } /* get status */ new_msr = 0; new_lsr = 0; (sc->sc_callback->ucom_cfg_get_status) (sc, &new_lsr, &new_msr); if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { /* TTY device closed */ return; } msr_delta = (sc->sc_msr ^ new_msr); lsr_delta = (sc->sc_lsr ^ new_lsr); sc->sc_msr = new_msr; sc->sc_lsr = new_lsr; /* * Time pulse counting support. */ switch(ucom_pps_mode & UART_PPS_SIGNAL_MASK) { case UART_PPS_CTS: pps_signal = SER_CTS; break; case UART_PPS_DCD: pps_signal = SER_DCD; break; default: pps_signal = 0; break; } if ((sc->sc_pps.ppsparam.mode & PPS_CAPTUREBOTH) && (msr_delta & pps_signal)) { pps_capture(&sc->sc_pps); onoff = (sc->sc_msr & pps_signal) ? 1 : 0; if (ucom_pps_mode & UART_PPS_INVERT_PULSE) onoff = !onoff; pps_event(&sc->sc_pps, onoff ? PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); } if (msr_delta & SER_DCD) { onoff = (sc->sc_msr & SER_DCD) ? 1 : 0; DPRINTF("DCD changed to %d\n", onoff); ttydisc_modem(tp, onoff); } if ((lsr_delta & ULSR_BI) && (sc->sc_lsr & ULSR_BI)) { DPRINTF("BREAK detected\n"); ttydisc_rint(tp, 0, TRE_BREAK); ttydisc_rint_done(tp); } if ((lsr_delta & ULSR_FE) && (sc->sc_lsr & ULSR_FE)) { DPRINTF("Frame error detected\n"); ttydisc_rint(tp, 0, TRE_FRAMING); ttydisc_rint_done(tp); } if ((lsr_delta & ULSR_PE) && (sc->sc_lsr & ULSR_PE)) { DPRINTF("Parity error detected\n"); ttydisc_rint(tp, 0, TRE_PARITY); ttydisc_rint_done(tp); } } void ucom_status_change(struct ucom_softc *sc) { UCOM_MTX_ASSERT(sc, MA_OWNED); if (sc->sc_flag & UCOM_FLAG_CONSOLE) return; /* not supported */ if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { return; } DPRINTF("\n"); ucom_queue_command(sc, ucom_cfg_status_change, NULL, &sc->sc_status_task[0].hdr, &sc->sc_status_task[1].hdr); } static void ucom_cfg_param(struct usb_proc_msg *_task) { struct ucom_param_task *task = (struct ucom_param_task *)_task; struct ucom_softc *sc = task->sc; if (!(sc->sc_flag & UCOM_FLAG_LL_READY)) { return; } if (sc->sc_callback->ucom_cfg_param == NULL) { return; } (sc->sc_callback->ucom_cfg_param) (sc, &task->termios_copy); /* wait a little */ usb_pause_mtx(sc->sc_mtx, hz / 10); } static int ucom_param(struct tty *tp, struct termios *t) { struct ucom_softc *sc = tty_softc(tp); uint8_t opened; int error; UCOM_MTX_ASSERT(sc, MA_OWNED); opened = 0; error = 0; if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { /* XXX the TTY layer should call "open()" first! */ /* * Not quite: Its ordering is partly backwards, but * some parameters must be set early in ttydev_open(), * possibly before calling ttydevsw_open(). */ error = ucom_open(tp); if (error) goto done; opened = 1; } DPRINTF("sc = %p\n", sc); /* Check requested parameters. */ if (t->c_ispeed && (t->c_ispeed != t->c_ospeed)) { /* XXX c_ospeed == 0 is perfectly valid. */ DPRINTF("mismatch ispeed and ospeed\n"); error = EINVAL; goto done; } t->c_ispeed = t->c_ospeed; if (sc->sc_callback->ucom_pre_param) { /* Let the lower layer verify the parameters */ error = (sc->sc_callback->ucom_pre_param) (sc, t); if (error) { DPRINTF("callback error = %d\n", error); goto done; } } /* Disable transfers */ sc->sc_flag &= ~UCOM_FLAG_GP_DATA; /* Queue baud rate programming command first */ ucom_queue_command(sc, ucom_cfg_param, t, &sc->sc_param_task[0].hdr, &sc->sc_param_task[1].hdr); /* Queue transfer enable command last */ ucom_queue_command(sc, ucom_cfg_start_transfers, NULL, &sc->sc_start_task[0].hdr, &sc->sc_start_task[1].hdr); if (t->c_cflag & CRTS_IFLOW) { sc->sc_flag |= UCOM_FLAG_RTS_IFLOW; } else if (sc->sc_flag & UCOM_FLAG_RTS_IFLOW) { sc->sc_flag &= ~UCOM_FLAG_RTS_IFLOW; ucom_modem(tp, SER_RTS, 0); } done: if (error) { if (opened) { ucom_close(tp); } } return (error); } static void ucom_outwakeup(struct tty *tp) { struct ucom_softc *sc = tty_softc(tp); UCOM_MTX_ASSERT(sc, MA_OWNED); DPRINTF("sc = %p\n", sc); if (!(sc->sc_flag & UCOM_FLAG_HL_READY)) { /* The higher layer is not ready */ return; } ucom_start_transfers(sc); } static bool ucom_busy(struct tty *tp) { struct ucom_softc *sc = tty_softc(tp); const uint8_t txidle = ULSR_TXRDY | ULSR_TSRE; UCOM_MTX_ASSERT(sc, MA_OWNED); DPRINTFN(3, "sc = %p lsr 0x%02x\n", sc, sc->sc_lsr); /* * If the driver maintains the txidle bits in LSR, we can use them to * determine whether the transmitter is busy or idle. Otherwise we have * to assume it is idle to avoid hanging forever on tcdrain(3). */ if (sc->sc_flag & UCOM_FLAG_LSRTXIDLE) return ((sc->sc_lsr & txidle) != txidle); else return (false); } /*------------------------------------------------------------------------* * ucom_get_data * * Return values: * 0: No data is available. * Else: Data is available. *------------------------------------------------------------------------*/ uint8_t ucom_get_data(struct ucom_softc *sc, struct usb_page_cache *pc, uint32_t offset, uint32_t len, uint32_t *actlen) { struct usb_page_search res; struct tty *tp = sc->sc_tty; uint32_t cnt; uint32_t offset_orig; UCOM_MTX_ASSERT(sc, MA_OWNED); if (sc->sc_flag & UCOM_FLAG_CONSOLE) { unsigned int temp; /* get total TX length */ temp = ucom_cons_tx_high - ucom_cons_tx_low; temp %= UCOM_CONS_BUFSIZE; /* limit TX length */ if (temp > (UCOM_CONS_BUFSIZE - ucom_cons_tx_low)) temp = (UCOM_CONS_BUFSIZE - ucom_cons_tx_low); if (temp > len) temp = len; /* copy in data */ usbd_copy_in(pc, offset, ucom_cons_tx_buf + ucom_cons_tx_low, temp); /* update counters */ ucom_cons_tx_low += temp; ucom_cons_tx_low %= UCOM_CONS_BUFSIZE; /* store actual length */ *actlen = temp; return (temp ? 1 : 0); } if (tty_gone(tp) || !(sc->sc_flag & UCOM_FLAG_GP_DATA)) { actlen[0] = 0; return (0); /* multiport device polling */ } offset_orig = offset; while (len != 0) { usbd_get_page(pc, offset, &res); if (res.length > len) { res.length = len; } /* copy data directly into USB buffer */ cnt = ttydisc_getc(tp, res.buffer, res.length); offset += cnt; len -= cnt; if (cnt < res.length) { /* end of buffer */ break; } } actlen[0] = offset - offset_orig; DPRINTF("cnt=%d\n", actlen[0]); if (actlen[0] == 0) { return (0); } return (1); } void ucom_put_data(struct ucom_softc *sc, struct usb_page_cache *pc, uint32_t offset, uint32_t len) { struct usb_page_search res; struct tty *tp = sc->sc_tty; char *buf; uint32_t cnt; UCOM_MTX_ASSERT(sc, MA_OWNED); if (sc->sc_flag & UCOM_FLAG_CONSOLE) { unsigned int temp; /* get maximum RX length */ temp = (UCOM_CONS_BUFSIZE - 1) - ucom_cons_rx_high + ucom_cons_rx_low; temp %= UCOM_CONS_BUFSIZE; /* limit RX length */ if (temp > (UCOM_CONS_BUFSIZE - ucom_cons_rx_high)) temp = (UCOM_CONS_BUFSIZE - ucom_cons_rx_high); if (temp > len) temp = len; /* copy out data */ usbd_copy_out(pc, offset, ucom_cons_rx_buf + ucom_cons_rx_high, temp); /* update counters */ ucom_cons_rx_high += temp; ucom_cons_rx_high %= UCOM_CONS_BUFSIZE; return; } if (tty_gone(tp)) return; /* multiport device polling */ if (len == 0) return; /* no data */ /* set a flag to prevent recursation ? */ while (len > 0) { usbd_get_page(pc, offset, &res); if (res.length > len) { res.length = len; } len -= res.length; offset += res.length; /* pass characters to tty layer */ buf = res.buffer; cnt = res.length; /* first check if we can pass the buffer directly */ if (ttydisc_can_bypass(tp)) { /* clear any jitter buffer */ sc->sc_jitterbuf_in = 0; sc->sc_jitterbuf_out = 0; if (ttydisc_rint_bypass(tp, buf, cnt) != cnt) { DPRINTF("tp=%p, data lost\n", tp); } continue; } /* need to loop */ for (cnt = 0; cnt != res.length; cnt++) { if (sc->sc_jitterbuf_in != sc->sc_jitterbuf_out || ttydisc_rint(tp, buf[cnt], 0) == -1) { uint16_t end; uint16_t pos; pos = sc->sc_jitterbuf_in; end = sc->sc_jitterbuf_out + UCOM_JITTERBUF_SIZE - 1; if (end >= UCOM_JITTERBUF_SIZE) end -= UCOM_JITTERBUF_SIZE; for (; cnt != res.length; cnt++) { if (pos == end) break; sc->sc_jitterbuf[pos] = buf[cnt]; pos++; if (pos >= UCOM_JITTERBUF_SIZE) pos -= UCOM_JITTERBUF_SIZE; } sc->sc_jitterbuf_in = pos; /* set RTS in async fashion */ if (sc->sc_flag & UCOM_FLAG_RTS_IFLOW) ucom_rts(sc, 1); DPRINTF("tp=%p, lost %d " "chars\n", tp, res.length - cnt); break; } } } ttydisc_rint_done(tp); } static void ucom_free(void *xsc) { struct ucom_softc *sc = xsc; if (sc->sc_callback->ucom_free != NULL) sc->sc_callback->ucom_free(sc); else ucom_unref(sc->sc_super); mtx_lock(&ucom_mtx); ucom_close_refs--; mtx_unlock(&ucom_mtx); } CONSOLE_DRIVER(ucom); static void ucom_cnprobe(struct consdev *cp) { if (ucom_cons_unit != -1) cp->cn_pri = CN_NORMAL; else cp->cn_pri = CN_DEAD; strlcpy(cp->cn_name, "ucom", sizeof(cp->cn_name)); } static void ucom_cninit(struct consdev *cp) { } static void ucom_cnterm(struct consdev *cp) { } static void ucom_cngrab(struct consdev *cp) { } static void ucom_cnungrab(struct consdev *cp) { } static int ucom_cngetc(struct consdev *cd) { struct ucom_softc *sc = ucom_cons_softc; int c; if (sc == NULL) return (-1); UCOM_MTX_LOCK(sc); if (ucom_cons_rx_low != ucom_cons_rx_high) { c = ucom_cons_rx_buf[ucom_cons_rx_low]; ucom_cons_rx_low ++; ucom_cons_rx_low %= UCOM_CONS_BUFSIZE; } else { c = -1; } /* start USB transfers */ ucom_outwakeup(sc->sc_tty); UCOM_MTX_UNLOCK(sc); /* poll if necessary */ if (USB_IN_POLLING_MODE_FUNC() && sc->sc_callback->ucom_poll) (sc->sc_callback->ucom_poll) (sc); return (c); } static void ucom_cnputc(struct consdev *cd, int c) { struct ucom_softc *sc = ucom_cons_softc; unsigned int temp; if (sc == NULL) return; repeat: UCOM_MTX_LOCK(sc); /* compute maximum TX length */ temp = (UCOM_CONS_BUFSIZE - 1) - ucom_cons_tx_high + ucom_cons_tx_low; temp %= UCOM_CONS_BUFSIZE; if (temp) { ucom_cons_tx_buf[ucom_cons_tx_high] = c; ucom_cons_tx_high ++; ucom_cons_tx_high %= UCOM_CONS_BUFSIZE; } /* start USB transfers */ ucom_outwakeup(sc->sc_tty); UCOM_MTX_UNLOCK(sc); /* poll if necessary */ if (USB_IN_POLLING_MODE_FUNC() && sc->sc_callback->ucom_poll) { (sc->sc_callback->ucom_poll) (sc); /* simple flow control */ if (temp == 0) goto repeat; } } /*------------------------------------------------------------------------* * ucom_ref * * This function will increment the super UCOM reference count. *------------------------------------------------------------------------*/ void ucom_ref(struct ucom_super_softc *ssc) { mtx_lock(&ucom_mtx); ssc->sc_refs++; mtx_unlock(&ucom_mtx); } /*------------------------------------------------------------------------* * ucom_free_unit * * This function will free the super UCOM's allocated unit * number. This function can be called on a zero-initialized * structure. This function can be called multiple times. *------------------------------------------------------------------------*/ static void ucom_free_unit(struct ucom_super_softc *ssc) { if (!(ssc->sc_flag & UCOM_FLAG_FREE_UNIT)) return; ucom_unit_free(ssc->sc_unit); ssc->sc_flag &= ~UCOM_FLAG_FREE_UNIT; } /*------------------------------------------------------------------------* * ucom_unref * * This function will decrement the super UCOM reference count. * * Return values: * 0: UCOM structures are still referenced. * Else: UCOM structures are no longer referenced. *------------------------------------------------------------------------*/ int ucom_unref(struct ucom_super_softc *ssc) { int retval; mtx_lock(&ucom_mtx); retval = (ssc->sc_refs < 2); ssc->sc_refs--; mtx_unlock(&ucom_mtx); if (retval) ucom_free_unit(ssc); return (retval); } #if defined(GDB) #include static gdb_probe_f ucom_gdbprobe; static gdb_init_f ucom_gdbinit; static gdb_term_f ucom_gdbterm; static gdb_getc_f ucom_gdbgetc; static gdb_putc_f ucom_gdbputc; GDB_DBGPORT(ucom, ucom_gdbprobe, ucom_gdbinit, ucom_gdbterm, ucom_gdbgetc, ucom_gdbputc); static int ucom_gdbprobe(void) { return ((ucom_cons_softc != NULL) ? 0 : -1); } static void ucom_gdbinit(void) { } static void ucom_gdbterm(void) { } static void ucom_gdbputc(int c) { ucom_cnputc(NULL, c); } static int ucom_gdbgetc(void) { return (ucom_cngetc(NULL)); } #endif