1/*	$NetBSD: umodem_common.c,v 1.21 2010/10/01 20:56:50 christos Exp $	*/
2
3/*
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Lennart Augustsson (lennart@augustsson.net) at
9 * Carlstedt Research & Technology.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * Comm Class spec:  http://www.usb.org/developers/devclass_docs/usbccs10.pdf
35 *                   http://www.usb.org/developers/devclass_docs/usbcdc11.pdf
36 */
37
38/*
39 * TODO:
40 * - Add error recovery in various places; the big problem is what
41 *   to do in a callback if there is an error.
42 * - Implement a Call Device for modems without multiplexed commands.
43 *
44 */
45
46#include <sys/cdefs.h>
47__KERNEL_RCSID(0, "$NetBSD: umodem_common.c,v 1.21 2010/10/01 20:56:50 christos Exp $");
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/kernel.h>
52#include <sys/ioctl.h>
53#include <sys/conf.h>
54#include <sys/tty.h>
55#include <sys/file.h>
56#include <sys/select.h>
57#include <sys/proc.h>
58#include <sys/vnode.h>
59#include <sys/device.h>
60#include <sys/poll.h>
61
62#include <dev/usb/usb.h>
63#include <dev/usb/usbcdc.h>
64
65#include <dev/usb/usbdi.h>
66#include <dev/usb/usbdi_util.h>
67#include <dev/usb/usbdevs.h>
68#include <dev/usb/usb_quirks.h>
69
70#include <dev/usb/ucomvar.h>
71#include <dev/usb/umodemvar.h>
72
73#ifdef UMODEM_DEBUG
74#define DPRINTFN(n, x)	if (umodemdebug > (n)) printf x
75int	umodemdebug = 0;
76#else
77#define DPRINTFN(n, x)
78#endif
79#define DPRINTF(x) DPRINTFN(0, x)
80
81/*
82 * These are the maximum number of bytes transferred per frame.
83 * If some really high speed devices should use this driver they
84 * may need to be increased, but this is good enough for normal modems.
85 *
86 * Note: increased from 64/256, to better support EVDO wireless PPP.
87 * The sizes should not be increased further, or there
88 * will be problems with contiguous storage allocation.
89 */
90#define UMODEMIBUFSIZE 4096
91#define UMODEMOBUFSIZE 4096
92
93Static usbd_status umodem_set_comm_feature(struct umodem_softc *sc,
94					   int feature, int state);
95Static usbd_status umodem_set_line_coding(struct umodem_softc *sc,
96					  usb_cdc_line_state_t *state);
97
98Static void	umodem_dtr(struct umodem_softc *, int);
99Static void	umodem_rts(struct umodem_softc *, int);
100Static void	umodem_break(struct umodem_softc *, int);
101Static void	umodem_set_line_state(struct umodem_softc *);
102Static void	umodem_intr(usbd_xfer_handle, usbd_private_handle, usbd_status);
103
104int
105umodem_common_attach(device_t self, struct umodem_softc *sc,
106		     struct usbif_attach_arg *uaa, struct ucom_attach_args *uca)
107{
108	usbd_device_handle dev = uaa->device;
109	usb_interface_descriptor_t *id;
110	usb_endpoint_descriptor_t *ed;
111	char *devinfop;
112	usbd_status err;
113	int data_ifcno;
114	int i;
115
116	sc->sc_dev = self;
117	sc->sc_udev = dev;
118	sc->sc_ctl_iface = uaa->iface;
119
120	aprint_naive("\n");
121	aprint_normal("\n");
122
123	id = usbd_get_interface_descriptor(sc->sc_ctl_iface);
124	devinfop = usbd_devinfo_alloc(uaa->device, 0);
125	aprint_normal_dev(self, "%s, iclass %d/%d\n",
126	       devinfop, id->bInterfaceClass, id->bInterfaceSubClass);
127	usbd_devinfo_free(devinfop);
128
129	sc->sc_ctl_iface_no = id->bInterfaceNumber;
130
131	/* Get the data interface no. */
132	sc->sc_data_iface_no = data_ifcno =
133	    umodem_get_caps(dev, &sc->sc_cm_cap, &sc->sc_acm_cap, id);
134
135	if (data_ifcno == -1) {
136		aprint_error_dev(self, "no pointer to data interface\n");
137		goto bad;
138	}
139
140	aprint_normal_dev(self,
141	    "data interface %d, has %sCM over data, has %sbreak\n",
142	    data_ifcno, sc->sc_cm_cap & USB_CDC_CM_OVER_DATA ? "" : "no ",
143	    sc->sc_acm_cap & USB_CDC_ACM_HAS_BREAK ? "" : "no ");
144
145	/* Get the data interface too. */
146	for (i = 0; i < uaa->nifaces; i++) {
147		if (uaa->ifaces[i] != NULL) {
148			id = usbd_get_interface_descriptor(uaa->ifaces[i]);
149			if (id != NULL && id->bInterfaceNumber == data_ifcno) {
150				sc->sc_data_iface = uaa->ifaces[i];
151				uaa->ifaces[i] = NULL;
152			}
153		}
154	}
155	if (sc->sc_data_iface == NULL) {
156		aprint_error_dev(self, "no data interface\n");
157		goto bad;
158	}
159
160	/*
161	 * Find the bulk endpoints.
162	 * Iterate over all endpoints in the data interface and take note.
163	 */
164	uca->bulkin = uca->bulkout = -1;
165
166	id = usbd_get_interface_descriptor(sc->sc_data_iface);
167	for (i = 0; i < id->bNumEndpoints; i++) {
168		ed = usbd_interface2endpoint_descriptor(sc->sc_data_iface, i);
169		if (ed == NULL) {
170			aprint_error_dev(self,
171			    "no endpoint descriptor for %d\n)", i);
172			goto bad;
173		}
174		if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
175		    (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
176			uca->bulkin = ed->bEndpointAddress;
177		} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
178			   (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
179			uca->bulkout = ed->bEndpointAddress;
180		}
181	}
182
183	if (uca->bulkin == -1) {
184		aprint_error_dev(self, "Could not find data bulk in\n");
185		goto bad;
186	}
187	if (uca->bulkout == -1) {
188		aprint_error_dev(self, "Could not find data bulk out\n");
189		goto bad;
190	}
191
192	if (usbd_get_quirks(sc->sc_udev)->uq_flags & UQ_ASSUME_CM_OVER_DATA) {
193		sc->sc_cm_over_data = 1;
194	} else {
195		if (sc->sc_cm_cap & USB_CDC_CM_OVER_DATA) {
196			if (sc->sc_acm_cap & USB_CDC_ACM_HAS_FEATURE)
197				err = umodem_set_comm_feature(sc,
198				    UCDC_ABSTRACT_STATE, UCDC_DATA_MULTIPLEXED);
199			else
200				err = 0;
201			if (err) {
202				aprint_error_dev(self,
203				    "could not set data multiplex mode\n");
204				goto bad;
205			}
206			sc->sc_cm_over_data = 1;
207		}
208	}
209
210	/*
211	 * The standard allows for notification messages (to indicate things
212	 * like a modem hangup) to come in via an interrupt endpoint
213	 * off of the control interface.  Iterate over the endpoints on
214	 * the control interface and see if there are any interrupt
215	 * endpoints; if there are, then register it.
216	 */
217
218	sc->sc_ctl_notify = -1;
219	sc->sc_notify_pipe = NULL;
220
221	id = usbd_get_interface_descriptor(sc->sc_ctl_iface);
222	for (i = 0; i < id->bNumEndpoints; i++) {
223		ed = usbd_interface2endpoint_descriptor(sc->sc_ctl_iface, i);
224		if (ed == NULL)
225			continue;
226
227		if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
228		    (ed->bmAttributes & UE_XFERTYPE) == UE_INTERRUPT) {
229			aprint_error_dev(self,
230			    "status change notification available\n");
231			sc->sc_ctl_notify = ed->bEndpointAddress;
232		}
233	}
234
235	sc->sc_dtr = -1;
236
237	/* bulkin, bulkout set above */
238	uca->ibufsize = UMODEMIBUFSIZE;
239	uca->obufsize = UMODEMOBUFSIZE;
240	uca->ibufsizepad = UMODEMIBUFSIZE;
241	uca->opkthdrlen = 0;
242	uca->device = sc->sc_udev;
243	uca->iface = sc->sc_data_iface;
244	uca->arg = sc;
245
246	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
247			   sc->sc_dev);
248
249	DPRINTF(("umodem_common_attach: sc=%p\n", sc));
250	sc->sc_subdev = config_found_sm_loc(self, "ucombus", NULL, uca,
251					    ucomprint, ucomsubmatch);
252
253	return 0;
254
255 bad:
256	sc->sc_dying = 1;
257	return 1;
258}
259
260int
261umodem_open(void *addr, int portno)
262{
263	struct umodem_softc *sc = addr;
264	int err;
265
266	DPRINTF(("umodem_open: sc=%p\n", sc));
267
268	if (sc->sc_ctl_notify != -1 && sc->sc_notify_pipe == NULL) {
269		err = usbd_open_pipe_intr(sc->sc_ctl_iface, sc->sc_ctl_notify,
270		    USBD_SHORT_XFER_OK, &sc->sc_notify_pipe, sc,
271		    &sc->sc_notify_buf, sizeof(sc->sc_notify_buf),
272		    umodem_intr, USBD_DEFAULT_INTERVAL);
273
274		if (err) {
275			DPRINTF(("Failed to establish notify pipe: %s\n",
276				usbd_errstr(err)));
277			return EIO;
278		}
279	}
280
281	return 0;
282}
283
284void
285umodem_close(void *addr, int portno)
286{
287	struct umodem_softc *sc = addr;
288	int err;
289
290	DPRINTF(("umodem_close: sc=%p\n", sc));
291
292	if (sc->sc_notify_pipe != NULL) {
293		err = usbd_abort_pipe(sc->sc_notify_pipe);
294		if (err)
295			printf("%s: abort notify pipe failed: %s\n",
296			    device_xname(sc->sc_dev), usbd_errstr(err));
297		err = usbd_close_pipe(sc->sc_notify_pipe);
298		if (err)
299			printf("%s: close notify pipe failed: %s\n",
300			    device_xname(sc->sc_dev), usbd_errstr(err));
301		sc->sc_notify_pipe = NULL;
302	}
303}
304
305Static void
306umodem_intr(usbd_xfer_handle xfer, usbd_private_handle priv,
307    usbd_status status)
308{
309	struct umodem_softc *sc = priv;
310	u_char mstatus;
311
312	if (sc->sc_dying)
313		return;
314
315	if (status != USBD_NORMAL_COMPLETION) {
316		if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
317			return;
318		printf("%s: abnormal status: %s\n", device_xname(sc->sc_dev),
319		       usbd_errstr(status));
320		if (status == USBD_STALLED)
321			usbd_clear_endpoint_stall_async(sc->sc_notify_pipe);
322		return;
323	}
324
325	if (sc->sc_notify_buf.bmRequestType != UCDC_NOTIFICATION) {
326		DPRINTF(("%s: unknown message type (%02x) on notify pipe\n",
327			 device_xname(sc->sc_dev),
328			 sc->sc_notify_buf.bmRequestType));
329		return;
330	}
331
332	switch (sc->sc_notify_buf.bNotification) {
333	case UCDC_N_SERIAL_STATE:
334		/*
335		 * Set the serial state in ucom driver based on
336		 * the bits from the notify message
337		 */
338		if (UGETW(sc->sc_notify_buf.wLength) != 2) {
339			printf("%s: Invalid notification length! (%d)\n",
340			       device_xname(sc->sc_dev),
341			       UGETW(sc->sc_notify_buf.wLength));
342			break;
343		}
344		DPRINTF(("%s: notify bytes = %02x%02x\n",
345			 device_xname(sc->sc_dev),
346			 sc->sc_notify_buf.data[0],
347			 sc->sc_notify_buf.data[1]));
348		/* Currently, lsr is always zero. */
349		sc->sc_lsr = sc->sc_msr = 0;
350		mstatus = sc->sc_notify_buf.data[0];
351
352		if (ISSET(mstatus, UCDC_N_SERIAL_RI))
353			sc->sc_msr |= UMSR_RI;
354		if (ISSET(mstatus, UCDC_N_SERIAL_DSR))
355			sc->sc_msr |= UMSR_DSR;
356		if (ISSET(mstatus, UCDC_N_SERIAL_DCD))
357			sc->sc_msr |= UMSR_DCD;
358		ucom_status_change(device_private(sc->sc_subdev));
359		break;
360	default:
361		DPRINTF(("%s: unknown notify message: %02x\n",
362			 device_xname(sc->sc_dev),
363			 sc->sc_notify_buf.bNotification));
364		break;
365	}
366}
367
368int
369umodem_get_caps(usbd_device_handle dev, int *cm, int *acm,
370		usb_interface_descriptor_t *id)
371{
372	const usb_cdc_cm_descriptor_t *cmd;
373	const usb_cdc_acm_descriptor_t *cad;
374	const usb_cdc_union_descriptor_t *cud;
375	u_int32_t uq_flags;
376
377	*cm = *acm = 0;
378	uq_flags = usbd_get_quirks(dev)->uq_flags;
379
380	if (uq_flags & UQ_NO_UNION_NRM) {
381		DPRINTF(("umodem_get_caps: NO_UNION_NRM quirk - returning 0\n"));
382		return 0;
383	}
384
385	if (uq_flags & UQ_LOST_CS_DESC)
386		id = NULL;
387
388	cmd = (const usb_cdc_cm_descriptor_t *)usb_find_desc_if(dev,
389							  UDESC_CS_INTERFACE,
390							  UDESCSUB_CDC_CM, id);
391	if (cmd == NULL) {
392		DPRINTF(("umodem_get_caps: no CM desc\n"));
393	} else {
394		*cm = cmd->bmCapabilities;
395	}
396
397	cad = (const usb_cdc_acm_descriptor_t *)usb_find_desc_if(dev,
398							   UDESC_CS_INTERFACE,
399							   UDESCSUB_CDC_ACM,
400							   id);
401	if (cad == NULL) {
402		DPRINTF(("umodem_get_caps: no ACM desc\n"));
403	} else {
404		*acm = cad->bmCapabilities;
405	}
406
407	cud = (const usb_cdc_union_descriptor_t *)usb_find_desc_if(dev,
408							     UDESC_CS_INTERFACE,
409							     UDESCSUB_CDC_UNION,
410							     id);
411	if (cud == NULL) {
412		DPRINTF(("umodem_get_caps: no UNION desc\n"));
413	}
414
415	return cmd ? cmd->bDataInterface : cud ? cud->bSlaveInterface[0] : -1;
416}
417
418void
419umodem_get_status(void *addr, int portno, u_char *lsr, u_char *msr)
420{
421	struct umodem_softc *sc = addr;
422
423	DPRINTF(("umodem_get_status:\n"));
424
425	if (lsr != NULL)
426		*lsr = sc->sc_lsr;
427	if (msr != NULL)
428		*msr = sc->sc_msr;
429}
430
431int
432umodem_param(void *addr, int portno, struct termios *t)
433{
434	struct umodem_softc *sc = addr;
435	usbd_status err;
436	usb_cdc_line_state_t ls;
437
438	DPRINTF(("umodem_param: sc=%p\n", sc));
439
440	USETDW(ls.dwDTERate, t->c_ospeed);
441	if (ISSET(t->c_cflag, CSTOPB))
442		ls.bCharFormat = UCDC_STOP_BIT_2;
443	else
444		ls.bCharFormat = UCDC_STOP_BIT_1;
445	if (ISSET(t->c_cflag, PARENB)) {
446		if (ISSET(t->c_cflag, PARODD))
447			ls.bParityType = UCDC_PARITY_ODD;
448		else
449			ls.bParityType = UCDC_PARITY_EVEN;
450	} else
451		ls.bParityType = UCDC_PARITY_NONE;
452	switch (ISSET(t->c_cflag, CSIZE)) {
453	case CS5:
454		ls.bDataBits = 5;
455		break;
456	case CS6:
457		ls.bDataBits = 6;
458		break;
459	case CS7:
460		ls.bDataBits = 7;
461		break;
462	case CS8:
463		ls.bDataBits = 8;
464		break;
465	}
466
467	err = umodem_set_line_coding(sc, &ls);
468	if (err) {
469		DPRINTF(("umodem_param: err=%s\n", usbd_errstr(err)));
470		return (EPASSTHROUGH);
471	}
472	return (0);
473}
474
475int
476umodem_ioctl(void *addr, int portno, u_long cmd, void *data,
477    int flag, proc_t *p)
478{
479	struct umodem_softc *sc = addr;
480	int error = 0;
481
482	if (sc->sc_dying)
483		return (EIO);
484
485	DPRINTF(("umodem_ioctl: cmd=0x%08lx\n", cmd));
486
487	switch (cmd) {
488	case USB_GET_CM_OVER_DATA:
489		*(int *)data = sc->sc_cm_over_data;
490		break;
491
492	case USB_SET_CM_OVER_DATA:
493		if (*(int *)data != sc->sc_cm_over_data) {
494			/* XXX change it */
495		}
496		break;
497
498	default:
499		DPRINTF(("umodem_ioctl: unknown\n"));
500		error = EPASSTHROUGH;
501		break;
502	}
503
504	return (error);
505}
506
507void
508umodem_dtr(struct umodem_softc *sc, int onoff)
509{
510	DPRINTF(("umodem_dtr: onoff=%d\n", onoff));
511
512	if (sc->sc_dtr == onoff)
513		return;
514	sc->sc_dtr = onoff;
515
516	umodem_set_line_state(sc);
517}
518
519void
520umodem_rts(struct umodem_softc *sc, int onoff)
521{
522	DPRINTF(("umodem_rts: onoff=%d\n", onoff));
523
524	if (sc->sc_rts == onoff)
525		return;
526	sc->sc_rts = onoff;
527
528	umodem_set_line_state(sc);
529}
530
531void
532umodem_set_line_state(struct umodem_softc *sc)
533{
534	usb_device_request_t req;
535	int ls;
536
537	ls = (sc->sc_dtr ? UCDC_LINE_DTR : 0) |
538	     (sc->sc_rts ? UCDC_LINE_RTS : 0);
539	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
540	req.bRequest = UCDC_SET_CONTROL_LINE_STATE;
541	USETW(req.wValue, ls);
542	USETW(req.wIndex, sc->sc_ctl_iface_no);
543	USETW(req.wLength, 0);
544
545	(void)usbd_do_request(sc->sc_udev, &req, 0);
546
547}
548
549void
550umodem_break(struct umodem_softc *sc, int onoff)
551{
552	usb_device_request_t req;
553
554	DPRINTF(("umodem_break: onoff=%d\n", onoff));
555
556	if (!(sc->sc_acm_cap & USB_CDC_ACM_HAS_BREAK))
557		return;
558
559	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
560	req.bRequest = UCDC_SEND_BREAK;
561	USETW(req.wValue, onoff ? UCDC_BREAK_ON : UCDC_BREAK_OFF);
562	USETW(req.wIndex, sc->sc_ctl_iface_no);
563	USETW(req.wLength, 0);
564
565	(void)usbd_do_request(sc->sc_udev, &req, 0);
566}
567
568void
569umodem_set(void *addr, int portno, int reg, int onoff)
570{
571	struct umodem_softc *sc = addr;
572
573	switch (reg) {
574	case UCOM_SET_DTR:
575		umodem_dtr(sc, onoff);
576		break;
577	case UCOM_SET_RTS:
578		umodem_rts(sc, onoff);
579		break;
580	case UCOM_SET_BREAK:
581		umodem_break(sc, onoff);
582		break;
583	default:
584		break;
585	}
586}
587
588usbd_status
589umodem_set_line_coding(struct umodem_softc *sc, usb_cdc_line_state_t *state)
590{
591	usb_device_request_t req;
592	usbd_status err;
593
594	DPRINTF(("umodem_set_line_coding: rate=%d fmt=%d parity=%d bits=%d\n",
595		 UGETDW(state->dwDTERate), state->bCharFormat,
596		 state->bParityType, state->bDataBits));
597
598	if (memcmp(state, &sc->sc_line_state, UCDC_LINE_STATE_LENGTH) == 0) {
599		DPRINTF(("umodem_set_line_coding: already set\n"));
600		return (USBD_NORMAL_COMPLETION);
601	}
602
603	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
604	req.bRequest = UCDC_SET_LINE_CODING;
605	USETW(req.wValue, 0);
606	USETW(req.wIndex, sc->sc_ctl_iface_no);
607	USETW(req.wLength, UCDC_LINE_STATE_LENGTH);
608
609	err = usbd_do_request(sc->sc_udev, &req, state);
610	if (err) {
611		DPRINTF(("umodem_set_line_coding: failed, err=%s\n",
612			 usbd_errstr(err)));
613		return (err);
614	}
615
616	sc->sc_line_state = *state;
617
618	return (USBD_NORMAL_COMPLETION);
619}
620
621usbd_status
622umodem_set_comm_feature(struct umodem_softc *sc, int feature, int state)
623{
624	usb_device_request_t req;
625	usbd_status err;
626	usb_cdc_abstract_state_t ast;
627
628	DPRINTF(("umodem_set_comm_feature: feature=%d state=%d\n", feature,
629		 state));
630
631	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
632	req.bRequest = UCDC_SET_COMM_FEATURE;
633	USETW(req.wValue, feature);
634	USETW(req.wIndex, sc->sc_ctl_iface_no);
635	USETW(req.wLength, UCDC_ABSTRACT_STATE_LENGTH);
636	USETW(ast.wState, state);
637
638	err = usbd_do_request(sc->sc_udev, &req, &ast);
639	if (err) {
640		DPRINTF(("umodem_set_comm_feature: feature=%d, err=%s\n",
641			 feature, usbd_errstr(err)));
642		return (err);
643	}
644
645	return (USBD_NORMAL_COMPLETION);
646}
647
648int
649umodem_common_activate(struct umodem_softc *sc, enum devact act)
650{
651	switch (act) {
652	case DVACT_DEACTIVATE:
653		sc->sc_dying = 1;
654		return 0;
655	default:
656		return EOPNOTSUPP;
657	}
658}
659
660void
661umodem_common_childdet(struct umodem_softc *sc, device_t child)
662{
663	KASSERT(sc->sc_subdev == child);
664	sc->sc_subdev = NULL;
665}
666
667int
668umodem_common_detach(struct umodem_softc *sc, int flags)
669{
670	int rv = 0;
671
672	DPRINTF(("umodem_common_detach: sc=%p flags=%d\n", sc, flags));
673
674	sc->sc_dying = 1;
675
676	if (sc->sc_subdev != NULL)
677		rv = config_detach(sc->sc_subdev, flags);
678
679	usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
680			   sc->sc_dev);
681
682	return (rv);
683}
684