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      1 /*	$NetBSD: umass_scsipi.c,v 1.70 2021/12/31 14:24:16 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001, 2003, 2012 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 (at) augustsson.net) at
      9  * Carlstedt Research & Technology, Charles M. Hamnnum and Matthew R. Green.
     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 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: umass_scsipi.c,v 1.70 2021/12/31 14:24:16 riastradh Exp $");
     35 
     36 #ifdef _KERNEL_OPT
     37 #include "opt_usb.h"
     38 #endif
     39 
     40 #include "atapibus.h"
     41 #include "scsibus.h"
     42 
     43 #include <sys/param.h>
     44 #include <sys/buf.h>
     45 #include <sys/bufq.h>
     46 #include <sys/conf.h>
     47 #include <sys/device.h>
     48 #include <sys/disk.h>		/* XXX */
     49 #include <sys/ioctl.h>
     50 #include <sys/kernel.h>
     51 #include <sys/kmem.h>
     52 #include <sys/lwp.h>
     53 #include <sys/malloc.h>
     54 #include <sys/systm.h>
     55 
     56 /* SCSI & ATAPI */
     57 #include <sys/scsiio.h>
     58 #include <dev/scsipi/scsi_spc.h>
     59 #include <dev/scsipi/scsi_all.h>
     60 #include <dev/scsipi/scsipi_all.h>
     61 #include <dev/scsipi/scsiconf.h>
     62 
     63 #include <dev/scsipi/atapiconf.h>
     64 
     65 #include <dev/scsipi/scsipi_disk.h>
     66 #include <dev/scsipi/scsi_disk.h>
     67 #include <dev/scsipi/scsi_changer.h>
     68 
     69 #include <dev/scsipi/sdvar.h>	/* XXX */
     70 
     71 /* USB */
     72 #include <dev/usb/usb.h>
     73 #include <dev/usb/usbdi.h>
     74 #include <dev/usb/usbdi_util.h>
     75 #include <dev/usb/usbdevs.h>
     76 #include <dev/usb/usbhist.h>
     77 
     78 #include <dev/usb/umassvar.h>
     79 #include <dev/usb/umass_scsipi.h>
     80 
     81 struct umass_scsipi_softc {
     82 	struct umassbus_softc	base;
     83 
     84 	struct atapi_adapter	sc_atapi_adapter;
     85 #define sc_adapter sc_atapi_adapter._generic
     86 	struct scsipi_channel sc_channel;
     87 	usbd_status		sc_sync_status;
     88 	struct scsi_request_sense	sc_sense_cmd;
     89 };
     90 
     91 
     92 #define SHORT_INQUIRY_LENGTH    36 /* XXX */
     93 
     94 #define UMASS_ATAPI_DRIVE	0
     95 
     96 Static void umass_scsipi_request(struct scsipi_channel *,
     97 				 scsipi_adapter_req_t, void *);
     98 Static void umass_scsipi_minphys(struct buf *);
     99 Static int umass_scsipi_ioctl(struct scsipi_channel *, u_long,
    100 			      void *, int, proc_t *);
    101 Static int umass_scsipi_getgeom(struct scsipi_periph *,
    102 				struct disk_parms *, u_long);
    103 
    104 Static void umass_null_cb(struct umass_softc *, void *,
    105 			  int, int);
    106 Static void umass_scsipi_cb(struct umass_softc *, void *,
    107 			    int, int);
    108 Static void umass_scsipi_sense_cb(struct umass_softc *, void *,
    109 				  int, int);
    110 
    111 Static struct umass_scsipi_softc *umass_scsipi_setup(struct umass_softc *);
    112 
    113 #if NATAPIBUS > 0
    114 Static void umass_atapi_probe_device(struct atapibus_softc *, int);
    115 
    116 const struct scsipi_bustype umass_atapi_bustype = {
    117 	.bustype_type = SCSIPI_BUSTYPE_ATAPI,
    118 	.bustype_cmd = atapi_scsipi_cmd,
    119 	.bustype_interpret_sense = atapi_interpret_sense,
    120 	.bustype_printaddr = atapi_print_addr,
    121 	.bustype_kill_pending = scsi_kill_pending,
    122 	.bustype_async_event_xfer_mode = NULL,
    123 };
    124 #endif
    125 
    126 
    127 #if NSCSIBUS > 0
    128 int
    129 umass_scsi_attach(struct umass_softc *sc)
    130 {
    131 	UMASSHIST_FUNC(); UMASSHIST_CALLED();
    132 	struct umass_scsipi_softc *scbus;
    133 
    134 	KASSERT(KERNEL_LOCKED_P());
    135 
    136 	scbus = umass_scsipi_setup(sc);
    137 
    138 	scbus->sc_channel.chan_bustype = &scsi_bustype;
    139 	scbus->sc_channel.chan_ntargets = 2;
    140 	scbus->sc_channel.chan_nluns = sc->maxlun + 1;
    141 	scbus->sc_channel.chan_id = scbus->sc_channel.chan_ntargets - 1;
    142 	DPRINTFM(UDMASS_USB, "sc %#jx: SCSI", (uintptr_t)sc, 0, 0, 0);
    143 
    144 	scbus->base.sc_child =
    145 	    config_found(sc->sc_dev, &scbus->sc_channel, scsiprint,
    146 			 CFARGS(.iattr = "scsi"));
    147 
    148 	return 0;
    149 }
    150 
    151 void
    152 umass_scsi_detach(struct umass_softc *sc)
    153 {
    154 	struct umass_scsipi_softc *scbus = (struct umass_scsipi_softc *)sc->bus;
    155 
    156 	kmem_free(scbus, sizeof(*scbus));
    157 	sc->bus = NULL;
    158 }
    159 #endif
    160 
    161 #if NATAPIBUS > 0
    162 int
    163 umass_atapi_attach(struct umass_softc *sc)
    164 {
    165 	UMASSHIST_FUNC(); UMASSHIST_CALLED();
    166 	struct umass_scsipi_softc *scbus;
    167 
    168 	KASSERT(KERNEL_LOCKED_P());
    169 
    170 	scbus = umass_scsipi_setup(sc);
    171 	scbus->sc_atapi_adapter.atapi_probe_device =  umass_atapi_probe_device;
    172 
    173 	scbus->sc_channel.chan_bustype = &umass_atapi_bustype;
    174 	scbus->sc_channel.chan_ntargets = 2;
    175 	scbus->sc_channel.chan_nluns = 1;
    176 
    177 	scbus->sc_channel.chan_defquirks |= sc->sc_busquirks;
    178 	DPRINTFM(UDMASS_USB, "sc %#jxp: ATAPI", (uintptr_t)sc, 0, 0, 0);
    179 
    180 	scbus->base.sc_child =
    181 	    config_found(sc->sc_dev, &scbus->sc_channel, atapiprint,
    182 			 CFARGS(.iattr = "atapi"));
    183 
    184 	return 0;
    185 }
    186 
    187 void
    188 umass_atapi_detach(struct umass_softc *sc)
    189 {
    190 	struct umass_scsipi_softc *scbus = (struct umass_scsipi_softc *)sc->bus;
    191 
    192 	kmem_free(scbus, sizeof(*scbus));
    193 	sc->bus = NULL;
    194 }
    195 #endif
    196 
    197 Static struct umass_scsipi_softc *
    198 umass_scsipi_setup(struct umass_softc *sc)
    199 {
    200 	struct umass_scsipi_softc *scbus;
    201 
    202 	scbus = kmem_zalloc(sizeof(*scbus), KM_SLEEP);
    203 	sc->bus = &scbus->base;
    204 
    205 	/* Only use big commands for USB SCSI devices. */
    206 	/* Do not ask for timeouts.  */
    207 	sc->sc_busquirks |= PQUIRK_ONLYBIG|PQUIRK_NOREPSUPPOPC;
    208 
    209 	/* Fill in the adapter. */
    210 	memset(&scbus->sc_adapter, 0, sizeof(scbus->sc_adapter));
    211 	scbus->sc_adapter.adapt_dev = sc->sc_dev;
    212 	scbus->sc_adapter.adapt_nchannels = 1;
    213 	scbus->sc_adapter.adapt_request = umass_scsipi_request;
    214 	scbus->sc_adapter.adapt_minphys = umass_scsipi_minphys;
    215 	scbus->sc_adapter.adapt_ioctl = umass_scsipi_ioctl;
    216 	scbus->sc_adapter.adapt_getgeom = umass_scsipi_getgeom;
    217 	scbus->sc_adapter.adapt_flags = SCSIPI_ADAPT_MPSAFE;
    218 
    219 	/* Fill in the channel. */
    220 	memset(&scbus->sc_channel, 0, sizeof(scbus->sc_channel));
    221 	scbus->sc_channel.chan_adapter = &scbus->sc_adapter;
    222 	scbus->sc_channel.chan_channel = 0;
    223 	scbus->sc_channel.chan_flags = SCSIPI_CHAN_OPENINGS | SCSIPI_CHAN_NOSETTLE;
    224 	scbus->sc_channel.chan_openings = 1;
    225 	scbus->sc_channel.chan_max_periph = 1;
    226 	scbus->sc_channel.chan_defquirks |= sc->sc_busquirks;
    227 
    228 	return scbus;
    229 }
    230 
    231 Static void
    232 umass_scsipi_request(struct scsipi_channel *chan,
    233 		scsipi_adapter_req_t req, void *arg)
    234 {
    235 	UMASSHIST_FUNC(); UMASSHIST_CALLED();
    236 	struct scsipi_adapter *adapt = chan->chan_adapter;
    237 	struct scsipi_periph *periph;
    238 	struct scsipi_xfer *xs;
    239 	struct umass_softc *sc = device_private(adapt->adapt_dev);
    240 	struct umass_scsipi_softc *scbus = (struct umass_scsipi_softc *)sc->bus;
    241 	struct scsipi_generic *cmd;
    242 	int cmdlen;
    243 	int dir;
    244 #ifdef UMASS_DEBUG
    245 	microtime(&sc->tv);
    246 #endif
    247 	switch(req) {
    248 	case ADAPTER_REQ_RUN_XFER:
    249 		xs = arg;
    250 		periph = xs->xs_periph;
    251 		DIF(UDMASS_UPPER, periph->periph_dbflags |= SCSIPI_DEBUG_FLAGS);
    252 
    253 		DPRINTFM(UDMASS_CMD, "sc %#jxp: %jd:%jd xs=%#jxp",
    254 		    (uintptr_t)sc, periph->periph_target, periph->periph_lun,
    255 		    (uintptr_t)xs);
    256 		DPRINTFM(UDMASS_CMD, "cmd=0x%02jx datalen=%jd (quirks=%#jx, "
    257 		    "poll=%jd)", xs->cmd->opcode, xs->datalen,
    258 		    periph->periph_quirks, !!(xs->xs_control & XS_CTL_POLL));
    259 #if defined(UMASS_DEBUG) && defined(SCSIPI_DEBUG)
    260 		if (umassdebug & UDMASS_SCSI)
    261 			show_scsipi_xs(xs);
    262 		else if (umassdebug & ~UDMASS_CMD)
    263 			show_scsipi_cmd(xs);
    264 #endif
    265 
    266 		if (sc->sc_dying) {
    267 			xs->error = XS_DRIVER_STUFFUP;
    268 			goto done;
    269 		}
    270 
    271 #ifdef UMASS_DEBUG
    272 		if (SCSIPI_BUSTYPE_TYPE(chan->chan_bustype->bustype_type) ==
    273 		    SCSIPI_BUSTYPE_ATAPI ?
    274 		    periph->periph_target != UMASS_ATAPI_DRIVE :
    275 		    periph->periph_target == chan->chan_id) {
    276 			DPRINTFM(UDMASS_SCSI, "sc %#jx: wrong SCSI ID %jd",
    277 			    (uintptr_t)sc, periph->periph_target, 0, 0);
    278 			xs->error = XS_DRIVER_STUFFUP;
    279 			goto done;
    280 		}
    281 #endif
    282 
    283 		cmd = xs->cmd;
    284 		cmdlen = xs->cmdlen;
    285 
    286 		dir = DIR_NONE;
    287 		if (xs->datalen) {
    288 			switch (xs->xs_control &
    289 			    (XS_CTL_DATA_IN | XS_CTL_DATA_OUT)) {
    290 			case XS_CTL_DATA_IN:
    291 				dir = DIR_IN;
    292 				break;
    293 			case XS_CTL_DATA_OUT:
    294 				dir = DIR_OUT;
    295 				break;
    296 			}
    297 		}
    298 
    299 		if (xs->datalen > UMASS_MAX_TRANSFER_SIZE) {
    300 			printf("umass_cmd: large datalen, %d\n", xs->datalen);
    301 			xs->error = XS_DRIVER_STUFFUP;
    302 			goto done;
    303 		}
    304 
    305 		if (xs->xs_control & XS_CTL_POLL) {
    306 			/* Use sync transfer. XXX Broken! */
    307 			DPRINTFM(UDMASS_SCSI, "sync dir=%jd\n", dir, 0, 0, 0);
    308 			scbus->sc_sync_status = USBD_INVAL;
    309 			sc->sc_methods->wire_xfer(sc, periph->periph_lun, cmd,
    310 						  cmdlen, xs->data,
    311 						  xs->datalen, dir,
    312 						  xs->timeout, USBD_SYNCHRONOUS,
    313 						  umass_null_cb, xs);
    314 			DPRINTFM(UDMASS_SCSI, "done err=%jd",
    315 			    scbus->sc_sync_status, 0, 0, 0);
    316 			switch (scbus->sc_sync_status) {
    317 			case USBD_NORMAL_COMPLETION:
    318 				xs->error = XS_NOERROR;
    319 				break;
    320 			case USBD_TIMEOUT:
    321 				xs->error = XS_TIMEOUT;
    322 				break;
    323 			default:
    324 				xs->error = XS_DRIVER_STUFFUP;
    325 				break;
    326 			}
    327 			goto done;
    328 		} else {
    329 			DPRINTFM(UDMASS_SCSI, "async dir=%jd, cmdlen=%jd"
    330 			    " datalen=%jd", dir, cmdlen, xs->datalen, 0);
    331 			sc->sc_methods->wire_xfer(sc, periph->periph_lun, cmd,
    332 						  cmdlen, xs->data,
    333 						  xs->datalen, dir,
    334 						  xs->timeout, 0,
    335 						  umass_scsipi_cb, xs);
    336 			return;
    337 		}
    338 
    339 		/* Return if command finishes early. */
    340  done:
    341 		scsipi_done(xs);
    342 		return;
    343 	default:
    344 		/* Not supported, nothing to do. */
    345 		;
    346 	}
    347 }
    348 
    349 Static void
    350 umass_scsipi_minphys(struct buf *bp)
    351 {
    352 #ifdef DIAGNOSTIC
    353 	if (bp->b_bcount <= 0) {
    354 		printf("umass_scsipi_minphys count(%d) <= 0\n",
    355 		       bp->b_bcount);
    356 		bp->b_bcount = UMASS_MAX_TRANSFER_SIZE;
    357 	}
    358 #endif
    359 	if (bp->b_bcount > UMASS_MAX_TRANSFER_SIZE)
    360 		bp->b_bcount = UMASS_MAX_TRANSFER_SIZE;
    361 	minphys(bp);
    362 }
    363 
    364 int
    365 umass_scsipi_ioctl(struct scsipi_channel *chan, u_long cmd,
    366     void *arg, int flag, proc_t *p)
    367 {
    368 	/*struct umass_softc *sc = link->adapter_softc;*/
    369 	/*struct umass_scsipi_softc *scbus = sc->bus;*/
    370 
    371 	switch (cmd) {
    372 #if 0
    373 	case SCBUSIORESET:
    374 		ccb->ccb_h.status = CAM_REQ_INPROG;
    375 		umass_reset(sc, umass_cam_cb, (void *) ccb);
    376 		return 0;
    377 #endif
    378 	default:
    379 		return ENOTTY;
    380 	}
    381 }
    382 
    383 Static int
    384 umass_scsipi_getgeom(struct scsipi_periph *periph, struct disk_parms *dp,
    385 		     u_long sectors)
    386 {
    387 	struct umass_softc *sc =
    388 	    device_private(periph->periph_channel->chan_adapter->adapt_dev);
    389 
    390 	/* If it's not a floppy, we don't know what to do. */
    391 	if (sc->sc_cmd != UMASS_CPROTO_UFI)
    392 		return 0;
    393 
    394 	switch (sectors) {
    395 	case 1440:
    396 		/* Most likely a single density 3.5" floppy. */
    397 		dp->heads = 2;
    398 		dp->sectors = 9;
    399 		dp->cyls = 80;
    400 		return 1;
    401 	case 2880:
    402 		/* Most likely a double density 3.5" floppy. */
    403 		dp->heads = 2;
    404 		dp->sectors = 18;
    405 		dp->cyls = 80;
    406 		return 1;
    407 	default:
    408 		return 0;
    409 	}
    410 }
    411 
    412 Static void
    413 umass_null_cb(struct umass_softc *sc, void *priv, int residue, int status)
    414 {
    415 	UMASSHIST_FUNC(); UMASSHIST_CALLED();
    416 }
    417 
    418 Static void
    419 umass_scsipi_cb(struct umass_softc *sc, void *priv, int residue, int status)
    420 {
    421 	UMASSHIST_FUNC(); UMASSHIST_CALLED();
    422 	struct umass_scsipi_softc *scbus = (struct umass_scsipi_softc *)sc->bus;
    423 	struct scsipi_xfer *xs = priv;
    424 	struct scsipi_periph *periph = xs->xs_periph;
    425 	int cmdlen, senselen;
    426 #ifdef UMASS_DEBUG
    427 	struct timeval tv;
    428 	u_int delta;
    429 	microtime(&tv);
    430 	delta = (tv.tv_sec - sc->tv.tv_sec) * 1000000 + tv.tv_usec - sc->tv.tv_usec;
    431 	DPRINTFM(UDMASS_CMD, "delta=%ju: xs=%#jx residue=%jd status=%jd",
    432 	    delta, (uintptr_t)xs, residue, status);
    433 #endif
    434 
    435 
    436 	xs->resid = residue;
    437 
    438 	switch (status) {
    439 	case STATUS_CMD_OK:
    440 		xs->error = XS_NOERROR;
    441 		break;
    442 
    443 	case STATUS_CMD_UNKNOWN:
    444 		/* FALLTHROUGH */
    445 	case STATUS_CMD_FAILED:
    446 		/* fetch sense data */
    447 		sc->sc_sense = 1;
    448 		memset(&scbus->sc_sense_cmd, 0, sizeof(scbus->sc_sense_cmd));
    449 		scbus->sc_sense_cmd.opcode = SCSI_REQUEST_SENSE;
    450 		scbus->sc_sense_cmd.byte2 = periph->periph_lun <<
    451 		    SCSI_CMD_LUN_SHIFT;
    452 
    453 		if (sc->sc_cmd == UMASS_CPROTO_UFI ||
    454 		    sc->sc_cmd == UMASS_CPROTO_ATAPI)
    455 			cmdlen = UFI_COMMAND_LENGTH;	/* XXX */
    456 		else
    457 			cmdlen = sizeof(scbus->sc_sense_cmd);
    458 		if (periph->periph_version < 0x04) /* SPC-2 */
    459 			senselen = 18;
    460 		else
    461 			senselen = sizeof(xs->sense);
    462 		scbus->sc_sense_cmd.length = senselen;
    463 		sc->sc_methods->wire_xfer(sc, periph->periph_lun,
    464 					  &scbus->sc_sense_cmd, cmdlen,
    465 					  &xs->sense, senselen,
    466 					  DIR_IN, xs->timeout, 0,
    467 					  umass_scsipi_sense_cb, xs);
    468 		return;
    469 
    470 	case STATUS_WIRE_FAILED:
    471 		xs->error = XS_RESET;
    472 		break;
    473 
    474 	case STATUS_TIMEOUT:
    475 		xs->error = XS_TIMEOUT;
    476 		break;
    477 
    478 	default:
    479 		panic("%s: Unknown status %d in umass_scsipi_cb",
    480 			device_xname(sc->sc_dev), status);
    481 	}
    482 
    483 	DPRINTFM(UDMASS_CMD, "return xs->error=%jd, xs->xs_status=%#jx"
    484 	    " xs->resid=%jd", xs->error, xs->xs_status, xs->resid, 0);
    485 
    486 	scsipi_done(xs);
    487 }
    488 
    489 /*
    490  * Finalise a completed autosense operation
    491  */
    492 Static void
    493 umass_scsipi_sense_cb(struct umass_softc *sc, void *priv, int residue,
    494 		      int status)
    495 {
    496 	UMASSHIST_FUNC(); UMASSHIST_CALLED();
    497 	struct scsipi_xfer *xs = priv;
    498 	size_t extra;
    499 
    500 	DPRINTFM(UDMASS_CMD, "sc %#jx: xs=%#jx residue=%jd status=%jd",
    501 	    (uintptr_t)sc, (uintptr_t)xs, residue, status);
    502 
    503 	sc->sc_sense = 0;
    504 	switch (status) {
    505 	case STATUS_CMD_OK:
    506 	case STATUS_CMD_UNKNOWN:
    507 		/* getting sense data succeeded */
    508 		extra = sizeof(xs->sense.scsi_sense)
    509 		      - sizeof(xs->sense.scsi_sense.extra_bytes);
    510 		if (residue <= extra)
    511 			xs->error = XS_SENSE;
    512 		else
    513 			xs->error = XS_SHORTSENSE;
    514 		break;
    515 	default:
    516 		DPRINTFM(UDMASS_SCSI, "sc %#jx: Autosense failed, status %jd",
    517 		    (uintptr_t)sc, status, 0, 0);
    518 		xs->error = XS_DRIVER_STUFFUP;
    519 		break;
    520 	}
    521 
    522 	DPRINTFM(UDMASS_CMD, "return xs->error=%jd, xs->xs_status=%#jx"
    523 	    " xs->resid=%jd", xs->error, xs->xs_status, xs->resid, 0);
    524 
    525 	scsipi_done(xs);
    526 }
    527 
    528 #if NATAPIBUS > 0
    529 Static void
    530 umass_atapi_probe_device(struct atapibus_softc *atapi, int target)
    531 {
    532 	UMASSHIST_FUNC(); UMASSHIST_CALLED();
    533 	struct scsipi_channel *chan = atapi->sc_channel;
    534 	struct scsipi_periph *periph;
    535 	struct scsipibus_attach_args sa;
    536 	char vendor[33], product[65], revision[17];
    537 	struct scsipi_inquiry_data inqbuf;
    538 
    539 	DPRINTFM(UDMASS_SCSI, "atapi=%#jx target=%jd", (uintptr_t)atapi,
    540 	    target, 0, 0);
    541 
    542 	if (target != UMASS_ATAPI_DRIVE)	/* only probe drive 0 */
    543 		return;
    544 
    545 	/* skip if already attached */
    546 	if (scsipi_lookup_periph(chan, target, 0) != NULL) {
    547 		return;
    548 	}
    549 
    550 	periph = scsipi_alloc_periph(M_WAITOK);
    551 	DIF(UDMASS_UPPER, periph->periph_dbflags |= 1); /* XXX 1 */
    552 	periph->periph_channel = chan;
    553 	periph->periph_switch = &atapi_probe_periphsw;
    554 	periph->periph_target = target;
    555 	periph->periph_quirks = chan->chan_defquirks;
    556 
    557 	DPRINTFM(UDMASS_SCSI, "doing inquiry", 0, 0, 0, 0);
    558 	/* Now go ask the device all about itself. */
    559 	memset(&inqbuf, 0, sizeof(inqbuf));
    560 	if (scsipi_inquire(periph, &inqbuf, XS_CTL_DISCOVERY) != 0) {
    561 		DPRINTFM(UDMASS_SCSI, "scsipi_inquire failed", 0, 0, 0, 0);
    562 		free(periph, M_DEVBUF);
    563 		return;
    564 	}
    565 
    566 	strnvisx(vendor, sizeof(vendor), inqbuf.vendor, 8,
    567 	    VIS_TRIM|VIS_SAFE|VIS_OCTAL);
    568 	strnvisx(product, sizeof(product), inqbuf.product, 16,
    569 	    VIS_TRIM|VIS_SAFE|VIS_OCTAL);
    570 	strnvisx(revision, sizeof(revision), inqbuf.revision, 4,
    571 	    VIS_TRIM|VIS_SAFE|VIS_OCTAL);
    572 
    573 	sa.sa_periph = periph;
    574 	sa.sa_inqbuf.type = inqbuf.device;
    575 	sa.sa_inqbuf.removable = inqbuf.dev_qual2 & SID_REMOVABLE ?
    576 	    T_REMOV : T_FIXED;
    577 	if (sa.sa_inqbuf.removable)
    578 		periph->periph_flags |= PERIPH_REMOVABLE;
    579 	sa.sa_inqbuf.vendor = vendor;
    580 	sa.sa_inqbuf.product = product;
    581 	sa.sa_inqbuf.revision = revision;
    582 	sa.sa_inqptr = NULL;
    583 
    584 	atapi_probe_device(atapi, target, periph, &sa);
    585 	/* atapi_probe_device() frees the periph when there is no device.*/
    586 }
    587 #endif
    588