1/*
   2 * Driver for Alauda-based card readers
   3 *
   4 * Current development and maintenance by:
   5 *   (c) 2005 Daniel Drake <dsd@gentoo.org>
   6 *
   7 * The 'Alauda' is a chip manufacturered by RATOC for OEM use.
   8 *
   9 * Alauda implements a vendor-specific command set to access two media reader
  10 * ports (XD, SmartMedia). This driver converts SCSI commands to the commands
  11 * which are accepted by these devices.
  12 *
  13 * The driver was developed through reverse-engineering, with the help of the
  14 * sddr09 driver which has many similarities, and with some help from the
  15 * (very old) vendor-supplied GPL sma03 driver.
  16 *
  17 * For protocol info, see http://alauda.sourceforge.net
  18 *
  19 * This program is free software; you can redistribute it and/or modify it
  20 * under the terms of the GNU General Public License as published by the
  21 * Free Software Foundation; either version 2, or (at your option) any
  22 * later version.
  23 *
  24 * This program is distributed in the hope that it will be useful, but
  25 * WITHOUT ANY WARRANTY; without even the implied warranty of
  26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  27 * General Public License for more details.
  28 *
  29 * You should have received a copy of the GNU General Public License along
  30 * with this program; if not, write to the Free Software Foundation, Inc.,
  31 * 675 Mass Ave, Cambridge, MA 02139, USA.
  32 */
  33
  34#include <linux/module.h>
  35#include <linux/slab.h>
  36
  37#include <scsi/scsi.h>
  38#include <scsi/scsi_cmnd.h>
  39#include <scsi/scsi_device.h>
  40
  41#include "usb.h"
  42#include "transport.h"
  43#include "protocol.h"
  44#include "debug.h"
  45
  46MODULE_DESCRIPTION("Driver for Alauda-based card readers");
  47MODULE_AUTHOR("Daniel Drake <dsd@gentoo.org>");
  48MODULE_LICENSE("GPL");
  49
  50/*
  51 * Status bytes
  52 */
  53#define ALAUDA_STATUS_ERROR		0x01
  54#define ALAUDA_STATUS_READY		0x40
  55
  56/*
  57 * Control opcodes (for request field)
  58 */
  59#define ALAUDA_GET_XD_MEDIA_STATUS	0x08
  60#define ALAUDA_GET_SM_MEDIA_STATUS	0x98
  61#define ALAUDA_ACK_XD_MEDIA_CHANGE	0x0a
  62#define ALAUDA_ACK_SM_MEDIA_CHANGE	0x9a
  63#define ALAUDA_GET_XD_MEDIA_SIG		0x86
  64#define ALAUDA_GET_SM_MEDIA_SIG		0x96
  65
  66/*
  67 * Bulk command identity (byte 0)
  68 */
  69#define ALAUDA_BULK_CMD			0x40
  70
  71/*
  72 * Bulk opcodes (byte 1)
  73 */
  74#define ALAUDA_BULK_GET_REDU_DATA	0x85
  75#define ALAUDA_BULK_READ_BLOCK		0x94
  76#define ALAUDA_BULK_ERASE_BLOCK		0xa3
  77#define ALAUDA_BULK_WRITE_BLOCK		0xb4
  78#define ALAUDA_BULK_GET_STATUS2		0xb7
  79#define ALAUDA_BULK_RESET_MEDIA		0xe0
  80
  81/*
  82 * Port to operate on (byte 8)
  83 */
  84#define ALAUDA_PORT_XD			0x00
  85#define ALAUDA_PORT_SM			0x01
  86
  87/*
  88 * LBA and PBA are unsigned ints. Special values.
  89 */
  90#define UNDEF    0xffff
  91#define SPARE    0xfffe
  92#define UNUSABLE 0xfffd
  93
  94struct alauda_media_info {
  95	unsigned long capacity;		/* total media size in bytes */
  96	unsigned int pagesize;		/* page size in bytes */
  97	unsigned int blocksize;		/* number of pages per block */
  98	unsigned int uzonesize;		/* number of usable blocks per zone */
  99	unsigned int zonesize;		/* number of blocks per zone */
 100	unsigned int blockmask;		/* mask to get page from address */
 101
 102	unsigned char pageshift;
 103	unsigned char blockshift;
 104	unsigned char zoneshift;
 105
 106	u16 **lba_to_pba;		/* logical to physical block map */
 107	u16 **pba_to_lba;		/* physical to logical block map */
 108};
 109
 110struct alauda_info {
 111	struct alauda_media_info port[2];
 112	int wr_ep;			/* endpoint to write data out of */
 113
 114	unsigned char sense_key;
 115	unsigned long sense_asc;	/* additional sense code */
 116	unsigned long sense_ascq;	/* additional sense code qualifier */
 117};
 118
 119#define short_pack(lsb,msb) ( ((u16)(lsb)) | ( ((u16)(msb))<<8 ) )
 120#define LSB_of(s) ((s)&0xFF)
 121#define MSB_of(s) ((s)>>8)
 122
 123#define MEDIA_PORT(us) us->srb->device->lun
 124#define MEDIA_INFO(us) ((struct alauda_info *)us->extra)->port[MEDIA_PORT(us)]
 125
 126#define PBA_LO(pba) ((pba & 0xF) << 5)
 127#define PBA_HI(pba) (pba >> 3)
 128#define PBA_ZONE(pba) (pba >> 11)
 129
 130static int init_alauda(struct us_data *us);
 131
 132
 133/*
 134 * The table of devices
 135 */
 136#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 137		    vendorName, productName, useProtocol, useTransport, \
 138		    initFunction, flags) \
 139{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 140  .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
 141
 142struct usb_device_id alauda_usb_ids[] = {
 143#	include "unusual_alauda.h"
 144	{ }		/* Terminating entry */
 145};
 146MODULE_DEVICE_TABLE(usb, alauda_usb_ids);
 147
 148#undef UNUSUAL_DEV
 149
 150/*
 151 * The flags table
 152 */
 153#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
 154		    vendor_name, product_name, use_protocol, use_transport, \
 155		    init_function, Flags) \
 156{ \
 157	.vendorName = vendor_name,	\
 158	.productName = product_name,	\
 159	.useProtocol = use_protocol,	\
 160	.useTransport = use_transport,	\
 161	.initFunction = init_function,	\
 162}
 163
 164static struct us_unusual_dev alauda_unusual_dev_list[] = {
 165#	include "unusual_alauda.h"
 166	{ }		/* Terminating entry */
 167};
 168
 169#undef UNUSUAL_DEV
 170
 171
 172/*
 173 * Media handling
 174 */
 175
 176struct alauda_card_info {
 177	unsigned char id;		/* id byte */
 178	unsigned char chipshift;	/* 1<<cs bytes total capacity */
 179	unsigned char pageshift;	/* 1<<ps bytes in a page */
 180	unsigned char blockshift;	/* 1<<bs pages per block */
 181	unsigned char zoneshift;	/* 1<<zs blocks per zone */
 182};
 183
 184static struct alauda_card_info alauda_card_ids[] = {
 185	/* NAND flash */
 186	{ 0x6e, 20, 8, 4, 8},	/* 1 MB */
 187	{ 0xe8, 20, 8, 4, 8},	/* 1 MB */
 188	{ 0xec, 20, 8, 4, 8},	/* 1 MB */
 189	{ 0x64, 21, 8, 4, 9}, 	/* 2 MB */
 190	{ 0xea, 21, 8, 4, 9},	/* 2 MB */
 191	{ 0x6b, 22, 9, 4, 9},	/* 4 MB */
 192	{ 0xe3, 22, 9, 4, 9},	/* 4 MB */
 193	{ 0xe5, 22, 9, 4, 9},	/* 4 MB */
 194	{ 0xe6, 23, 9, 4, 10},	/* 8 MB */
 195	{ 0x73, 24, 9, 5, 10},	/* 16 MB */
 196	{ 0x75, 25, 9, 5, 10},	/* 32 MB */
 197	{ 0x76, 26, 9, 5, 10},	/* 64 MB */
 198	{ 0x79, 27, 9, 5, 10},	/* 128 MB */
 199	{ 0x71, 28, 9, 5, 10},	/* 256 MB */
 200
 201	/* MASK ROM */
 202	{ 0x5d, 21, 9, 4, 8},	/* 2 MB */
 203	{ 0xd5, 22, 9, 4, 9},	/* 4 MB */
 204	{ 0xd6, 23, 9, 4, 10},	/* 8 MB */
 205	{ 0x57, 24, 9, 4, 11},	/* 16 MB */
 206	{ 0x58, 25, 9, 4, 12},	/* 32 MB */
 207	{ 0,}
 208};
 209
 210static struct alauda_card_info *alauda_card_find_id(unsigned char id) {
 211	int i;
 212
 213	for (i = 0; alauda_card_ids[i].id != 0; i++)
 214		if (alauda_card_ids[i].id == id)
 215			return &(alauda_card_ids[i]);
 216	return NULL;
 217}
 218
 219/*
 220 * ECC computation.
 221 */
 222
 223static unsigned char parity[256];
 224static unsigned char ecc2[256];
 225
 226static void nand_init_ecc(void) {
 227	int i, j, a;
 228
 229	parity[0] = 0;
 230	for (i = 1; i < 256; i++)
 231		parity[i] = (parity[i&(i-1)] ^ 1);
 232
 233	for (i = 0; i < 256; i++) {
 234		a = 0;
 235		for (j = 0; j < 8; j++) {
 236			if (i & (1<<j)) {
 237				if ((j & 1) == 0)
 238					a ^= 0x04;
 239				if ((j & 2) == 0)
 240					a ^= 0x10;
 241				if ((j & 4) == 0)
 242					a ^= 0x40;
 243			}
 244		}
 245		ecc2[i] = ~(a ^ (a<<1) ^ (parity[i] ? 0xa8 : 0));
 246	}
 247}
 248
 249/* compute 3-byte ecc on 256 bytes */
 250static void nand_compute_ecc(unsigned char *data, unsigned char *ecc) {
 251	int i, j, a;
 252	unsigned char par, bit, bits[8];
 253
 254	par = 0;
 255	for (j = 0; j < 8; j++)
 256		bits[j] = 0;
 257
 258	/* collect 16 checksum bits */
 259	for (i = 0; i < 256; i++) {
 260		par ^= data[i];
 261		bit = parity[data[i]];
 262		for (j = 0; j < 8; j++)
 263			if ((i & (1<<j)) == 0)
 264				bits[j] ^= bit;
 265	}
 266
 267	/* put 4+4+4 = 12 bits in the ecc */
 268	a = (bits[3] << 6) + (bits[2] << 4) + (bits[1] << 2) + bits[0];
 269	ecc[0] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0));
 270
 271	a = (bits[7] << 6) + (bits[6] << 4) + (bits[5] << 2) + bits[4];
 272	ecc[1] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0));
 273
 274	ecc[2] = ecc2[par];
 275}
 276
 277static int nand_compare_ecc(unsigned char *data, unsigned char *ecc) {
 278	return (data[0] == ecc[0] && data[1] == ecc[1] && data[2] == ecc[2]);
 279}
 280
 281static void nand_store_ecc(unsigned char *data, unsigned char *ecc) {
 282	memcpy(data, ecc, 3);
 283}
 284
 285/*
 286 * Alauda driver
 287 */
 288
 289/*
 290 * Forget our PBA <---> LBA mappings for a particular port
 291 */
 292static void alauda_free_maps (struct alauda_media_info *media_info)
 293{
 294	unsigned int shift = media_info->zoneshift
 295		+ media_info->blockshift + media_info->pageshift;
 296	unsigned int num_zones = media_info->capacity >> shift;
 297	unsigned int i;
 298
 299	if (media_info->lba_to_pba != NULL)
 300		for (i = 0; i < num_zones; i++) {
 301			kfree(media_info->lba_to_pba[i]);
 302			media_info->lba_to_pba[i] = NULL;
 303		}
 304
 305	if (media_info->pba_to_lba != NULL)
 306		for (i = 0; i < num_zones; i++) {
 307			kfree(media_info->pba_to_lba[i]);
 308			media_info->pba_to_lba[i] = NULL;
 309		}
 310}
 311
 312/*
 313 * Returns 2 bytes of status data
 314 * The first byte describes media status, and second byte describes door status
 315 */
 316static int alauda_get_media_status(struct us_data *us, unsigned char *data)
 317{
 318	int rc;
 319	unsigned char command;
 320
 321	if (MEDIA_PORT(us) == ALAUDA_PORT_XD)
 322		command = ALAUDA_GET_XD_MEDIA_STATUS;
 323	else
 324		command = ALAUDA_GET_SM_MEDIA_STATUS;
 325
 326	rc = usb_stor_ctrl_transfer(us, us->recv_ctrl_pipe,
 327		command, 0xc0, 0, 1, data, 2);
 328
 329	US_DEBUGP("alauda_get_media_status: Media status %02X %02X\n",
 330		data[0], data[1]);
 331
 332	return rc;
 333}
 334
 335/*
 336 * Clears the "media was changed" bit so that we know when it changes again
 337 * in the future.
 338 */
 339static int alauda_ack_media(struct us_data *us)
 340{
 341	unsigned char command;
 342
 343	if (MEDIA_PORT(us) == ALAUDA_PORT_XD)
 344		command = ALAUDA_ACK_XD_MEDIA_CHANGE;
 345	else
 346		command = ALAUDA_ACK_SM_MEDIA_CHANGE;
 347
 348	return usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 349		command, 0x40, 0, 1, NULL, 0);
 350}
 351
 352/*
 353 * Retrieves a 4-byte media signature, which indicates manufacturer, capacity,
 354 * and some other details.
 355 */
 356static int alauda_get_media_signature(struct us_data *us, unsigned char *data)
 357{
 358	unsigned char command;
 359
 360	if (MEDIA_PORT(us) == ALAUDA_PORT_XD)
 361		command = ALAUDA_GET_XD_MEDIA_SIG;
 362	else
 363		command = ALAUDA_GET_SM_MEDIA_SIG;
 364
 365	return usb_stor_ctrl_transfer(us, us->recv_ctrl_pipe,
 366		command, 0xc0, 0, 0, data, 4);
 367}
 368
 369/*
 370 * Resets the media status (but not the whole device?)
 371 */
 372static int alauda_reset_media(struct us_data *us)
 373{
 374	unsigned char *command = us->iobuf;
 375
 376	memset(command, 0, 9);
 377	command[0] = ALAUDA_BULK_CMD;
 378	command[1] = ALAUDA_BULK_RESET_MEDIA;
 379	command[8] = MEDIA_PORT(us);
 380
 381	return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 382		command, 9, NULL);
 383}
 384
 385/*
 386 * Examines the media and deduces capacity, etc.
 387 */
 388static int alauda_init_media(struct us_data *us)
 389{
 390	unsigned char *data = us->iobuf;
 391	int ready = 0;
 392	struct alauda_card_info *media_info;
 393	unsigned int num_zones;
 394
 395	while (ready == 0) {
 396		msleep(20);
 397
 398		if (alauda_get_media_status(us, data) != USB_STOR_XFER_GOOD)
 399			return USB_STOR_TRANSPORT_ERROR;
 400
 401		if (data[0] & 0x10)
 402			ready = 1;
 403	}
 404
 405	US_DEBUGP("alauda_init_media: We are ready for action!\n");
 406
 407	if (alauda_ack_media(us) != USB_STOR_XFER_GOOD)
 408		return USB_STOR_TRANSPORT_ERROR;
 409
 410	msleep(10);
 411
 412	if (alauda_get_media_status(us, data) != USB_STOR_XFER_GOOD)
 413		return USB_STOR_TRANSPORT_ERROR;
 414
 415	if (data[0] != 0x14) {
 416		US_DEBUGP("alauda_init_media: Media not ready after ack\n");
 417		return USB_STOR_TRANSPORT_ERROR;
 418	}
 419
 420	if (alauda_get_media_signature(us, data) != USB_STOR_XFER_GOOD)
 421		return USB_STOR_TRANSPORT_ERROR;
 422
 423	US_DEBUGP("alauda_init_media: Media signature: %02X %02X %02X %02X\n",
 424		data[0], data[1], data[2], data[3]);
 425	media_info = alauda_card_find_id(data[1]);
 426	if (media_info == NULL) {
 427		printk(KERN_WARNING
 428			"alauda_init_media: Unrecognised media signature: "
 429			"%02X %02X %02X %02X\n",
 430			data[0], data[1], data[2], data[3]);
 431		return USB_STOR_TRANSPORT_ERROR;
 432	}
 433
 434	MEDIA_INFO(us).capacity = 1 << media_info->chipshift;
 435	US_DEBUGP("Found media with capacity: %ldMB\n",
 436		MEDIA_INFO(us).capacity >> 20);
 437
 438	MEDIA_INFO(us).pageshift = media_info->pageshift;
 439	MEDIA_INFO(us).blockshift = media_info->blockshift;
 440	MEDIA_INFO(us).zoneshift = media_info->zoneshift;
 441
 442	MEDIA_INFO(us).pagesize = 1 << media_info->pageshift;
 443	MEDIA_INFO(us).blocksize = 1 << media_info->blockshift;
 444	MEDIA_INFO(us).zonesize = 1 << media_info->zoneshift;
 445
 446	MEDIA_INFO(us).uzonesize = ((1 << media_info->zoneshift) / 128) * 125;
 447	MEDIA_INFO(us).blockmask = MEDIA_INFO(us).blocksize - 1;
 448
 449	num_zones = MEDIA_INFO(us).capacity >> (MEDIA_INFO(us).zoneshift
 450		+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
 451	MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
 452	MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
 453
 454	if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
 455		return USB_STOR_TRANSPORT_ERROR;
 456
 457	return USB_STOR_TRANSPORT_GOOD;
 458}
 459
 460/*
 461 * Examines the media status and does the right thing when the media has gone,
 462 * appeared, or changed.
 463 */
 464static int alauda_check_media(struct us_data *us)
 465{
 466	struct alauda_info *info = (struct alauda_info *) us->extra;
 467	unsigned char status[2];
 468	int rc;
 469
 470	rc = alauda_get_media_status(us, status);
 471
 472	/* Check for no media or door open */
 473	if ((status[0] & 0x80) || ((status[0] & 0x1F) == 0x10)
 474		|| ((status[1] & 0x01) == 0)) {
 475		US_DEBUGP("alauda_check_media: No media, or door open\n");
 476		alauda_free_maps(&MEDIA_INFO(us));
 477		info->sense_key = 0x02;
 478		info->sense_asc = 0x3A;
 479		info->sense_ascq = 0x00;
 480		return USB_STOR_TRANSPORT_FAILED;
 481	}
 482
 483	/* Check for media change */
 484	if (status[0] & 0x08) {
 485		US_DEBUGP("alauda_check_media: Media change detected\n");
 486		alauda_free_maps(&MEDIA_INFO(us));
 487		alauda_init_media(us);
 488
 489		info->sense_key = UNIT_ATTENTION;
 490		info->sense_asc = 0x28;
 491		info->sense_ascq = 0x00;
 492		return USB_STOR_TRANSPORT_FAILED;
 493	}
 494
 495	return USB_STOR_TRANSPORT_GOOD;
 496}
 497
 498/*
 499 * Checks the status from the 2nd status register
 500 * Returns 3 bytes of status data, only the first is known
 501 */
 502static int alauda_check_status2(struct us_data *us)
 503{
 504	int rc;
 505	unsigned char command[] = {
 506		ALAUDA_BULK_CMD, ALAUDA_BULK_GET_STATUS2,
 507		0, 0, 0, 0, 3, 0, MEDIA_PORT(us)
 508	};
 509	unsigned char data[3];
 510
 511	rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 512		command, 9, NULL);
 513	if (rc != USB_STOR_XFER_GOOD)
 514		return rc;
 515
 516	rc = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
 517		data, 3, NULL);
 518	if (rc != USB_STOR_XFER_GOOD)
 519		return rc;
 520
 521	US_DEBUGP("alauda_check_status2: %02X %02X %02X\n", data[0], data[1], data[2]);
 522	if (data[0] & ALAUDA_STATUS_ERROR)
 523		return USB_STOR_XFER_ERROR;
 524
 525	return USB_STOR_XFER_GOOD;
 526}
 527
 528/*
 529 * Gets the redundancy data for the first page of a PBA
 530 * Returns 16 bytes.
 531 */
 532static int alauda_get_redu_data(struct us_data *us, u16 pba, unsigned char *data)
 533{
 534	int rc;
 535	unsigned char command[] = {
 536		ALAUDA_BULK_CMD, ALAUDA_BULK_GET_REDU_DATA,
 537		PBA_HI(pba), PBA_ZONE(pba), 0, PBA_LO(pba), 0, 0, MEDIA_PORT(us)
 538	};
 539
 540	rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 541		command, 9, NULL);
 542	if (rc != USB_STOR_XFER_GOOD)
 543		return rc;
 544
 545	return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
 546		data, 16, NULL);
 547}
 548
 549/*
 550 * Finds the first unused PBA in a zone
 551 * Returns the absolute PBA of an unused PBA, or 0 if none found.
 552 */
 553static u16 alauda_find_unused_pba(struct alauda_media_info *info,
 554	unsigned int zone)
 555{
 556	u16 *pba_to_lba = info->pba_to_lba[zone];
 557	unsigned int i;
 558
 559	for (i = 0; i < info->zonesize; i++)
 560		if (pba_to_lba[i] == UNDEF)
 561			return (zone << info->zoneshift) + i;
 562
 563	return 0;
 564}
 565
 566/*
 567 * Reads the redundancy data for all PBA's in a zone
 568 * Produces lba <--> pba mappings
 569 */
 570static int alauda_read_map(struct us_data *us, unsigned int zone)
 571{
 572	unsigned char *data = us->iobuf;
 573	int result;
 574	int i, j;
 575	unsigned int zonesize = MEDIA_INFO(us).zonesize;
 576	unsigned int uzonesize = MEDIA_INFO(us).uzonesize;
 577	unsigned int lba_offset, lba_real, blocknum;
 578	unsigned int zone_base_lba = zone * uzonesize;
 579	unsigned int zone_base_pba = zone * zonesize;
 580	u16 *lba_to_pba = kcalloc(zonesize, sizeof(u16), GFP_NOIO);
 581	u16 *pba_to_lba = kcalloc(zonesize, sizeof(u16), GFP_NOIO);
 582	if (lba_to_pba == NULL || pba_to_lba == NULL) {
 583		result = USB_STOR_TRANSPORT_ERROR;
 584		goto error;
 585	}
 586
 587	US_DEBUGP("alauda_read_map: Mapping blocks for zone %d\n", zone);
 588
 589	/* 1024 PBA's per zone */
 590	for (i = 0; i < zonesize; i++)
 591		lba_to_pba[i] = pba_to_lba[i] = UNDEF;
 592
 593	for (i = 0; i < zonesize; i++) {
 594		blocknum = zone_base_pba + i;
 595
 596		result = alauda_get_redu_data(us, blocknum, data);
 597		if (result != USB_STOR_XFER_GOOD) {
 598			result = USB_STOR_TRANSPORT_ERROR;
 599			goto error;
 600		}
 601
 602		/* special PBAs have control field 0^16 */
 603		for (j = 0; j < 16; j++)
 604			if (data[j] != 0)
 605				goto nonz;
 606		pba_to_lba[i] = UNUSABLE;
 607		US_DEBUGP("alauda_read_map: PBA %d has no logical mapping\n", blocknum);
 608		continue;
 609
 610	nonz:
 611		/* unwritten PBAs have control field FF^16 */
 612		for (j = 0; j < 16; j++)
 613			if (data[j] != 0xff)
 614				goto nonff;
 615		continue;
 616
 617	nonff:
 618		/* normal PBAs start with six FFs */
 619		if (j < 6) {
 620			US_DEBUGP("alauda_read_map: PBA %d has no logical mapping: "
 621			       "reserved area = %02X%02X%02X%02X "
 622			       "data status %02X block status %02X\n",
 623			       blocknum, data[0], data[1], data[2], data[3],
 624			       data[4], data[5]);
 625			pba_to_lba[i] = UNUSABLE;
 626			continue;
 627		}
 628
 629		if ((data[6] >> 4) != 0x01) {
 630			US_DEBUGP("alauda_read_map: PBA %d has invalid address "
 631			       "field %02X%02X/%02X%02X\n",
 632			       blocknum, data[6], data[7], data[11], data[12]);
 633			pba_to_lba[i] = UNUSABLE;
 634			continue;
 635		}
 636
 637		/* check even parity */
 638		if (parity[data[6] ^ data[7]]) {
 639			printk(KERN_WARNING
 640			       "alauda_read_map: Bad parity in LBA for block %d"
 641			       " (%02X %02X)\n", i, data[6], data[7]);
 642			pba_to_lba[i] = UNUSABLE;
 643			continue;
 644		}
 645
 646		lba_offset = short_pack(data[7], data[6]);
 647		lba_offset = (lba_offset & 0x07FF) >> 1;
 648		lba_real = lba_offset + zone_base_lba;
 649
 650		/*
 651		 * Every 1024 physical blocks ("zone"), the LBA numbers
 652		 * go back to zero, but are within a higher block of LBA's.
 653		 * Also, there is a maximum of 1000 LBA's per zone.
 654		 * In other words, in PBA 1024-2047 you will find LBA 0-999
 655		 * which are really LBA 1000-1999. This allows for 24 bad
 656		 * or special physical blocks per zone.
 657		 */
 658
 659		if (lba_offset >= uzonesize) {
 660			printk(KERN_WARNING
 661			       "alauda_read_map: Bad low LBA %d for block %d\n",
 662			       lba_real, blocknum);
 663			continue;
 664		}
 665
 666		if (lba_to_pba[lba_offset] != UNDEF) {
 667			printk(KERN_WARNING
 668			       "alauda_read_map: "
 669			       "LBA %d seen for PBA %d and %d\n",
 670			       lba_real, lba_to_pba[lba_offset], blocknum);
 671			continue;
 672		}
 673
 674		pba_to_lba[i] = lba_real;
 675		lba_to_pba[lba_offset] = blocknum;
 676		continue;
 677	}
 678
 679	MEDIA_INFO(us).lba_to_pba[zone] = lba_to_pba;
 680	MEDIA_INFO(us).pba_to_lba[zone] = pba_to_lba;
 681	result = 0;
 682	goto out;
 683
 684error:
 685	kfree(lba_to_pba);
 686	kfree(pba_to_lba);
 687out:
 688	return result;
 689}
 690
 691/*
 692 * Checks to see whether we have already mapped a certain zone
 693 * If we haven't, the map is generated
 694 */
 695static void alauda_ensure_map_for_zone(struct us_data *us, unsigned int zone)
 696{
 697	if (MEDIA_INFO(us).lba_to_pba[zone] == NULL
 698		|| MEDIA_INFO(us).pba_to_lba[zone] == NULL)
 699		alauda_read_map(us, zone);
 700}
 701
 702/*
 703 * Erases an entire block
 704 */
 705static int alauda_erase_block(struct us_data *us, u16 pba)
 706{
 707	int rc;
 708	unsigned char command[] = {
 709		ALAUDA_BULK_CMD, ALAUDA_BULK_ERASE_BLOCK, PBA_HI(pba),
 710		PBA_ZONE(pba), 0, PBA_LO(pba), 0x02, 0, MEDIA_PORT(us)
 711	};
 712	unsigned char buf[2];
 713
 714	US_DEBUGP("alauda_erase_block: Erasing PBA %d\n", pba);
 715
 716	rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 717		command, 9, NULL);
 718	if (rc != USB_STOR_XFER_GOOD)
 719		return rc;
 720
 721	rc = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
 722		buf, 2, NULL);
 723	if (rc != USB_STOR_XFER_GOOD)
 724		return rc;
 725
 726	US_DEBUGP("alauda_erase_block: Erase result: %02X %02X\n",
 727		buf[0], buf[1]);
 728	return rc;
 729}
 730
 731/*
 732 * Reads data from a certain offset page inside a PBA, including interleaved
 733 * redundancy data. Returns (pagesize+64)*pages bytes in data.
 734 */
 735static int alauda_read_block_raw(struct us_data *us, u16 pba,
 736		unsigned int page, unsigned int pages, unsigned char *data)
 737{
 738	int rc;
 739	unsigned char command[] = {
 740		ALAUDA_BULK_CMD, ALAUDA_BULK_READ_BLOCK, PBA_HI(pba),
 741		PBA_ZONE(pba), 0, PBA_LO(pba) + page, pages, 0, MEDIA_PORT(us)
 742	};
 743
 744	US_DEBUGP("alauda_read_block: pba %d page %d count %d\n",
 745		pba, page, pages);
 746
 747	rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 748		command, 9, NULL);
 749	if (rc != USB_STOR_XFER_GOOD)
 750		return rc;
 751
 752	return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
 753		data, (MEDIA_INFO(us).pagesize + 64) * pages, NULL);
 754}
 755
 756/*
 757 * Reads data from a certain offset page inside a PBA, excluding redundancy
 758 * data. Returns pagesize*pages bytes in data. Note that data must be big enough
 759 * to hold (pagesize+64)*pages bytes of data, but you can ignore those 'extra'
 760 * trailing bytes outside this function.
 761 */
 762static int alauda_read_block(struct us_data *us, u16 pba,
 763		unsigned int page, unsigned int pages, unsigned char *data)
 764{
 765	int i, rc;
 766	unsigned int pagesize = MEDIA_INFO(us).pagesize;
 767
 768	rc = alauda_read_block_raw(us, pba, page, pages, data);
 769	if (rc != USB_STOR_XFER_GOOD)
 770		return rc;
 771
 772	/* Cut out the redundancy data */
 773	for (i = 0; i < pages; i++) {
 774		int dest_offset = i * pagesize;
 775		int src_offset = i * (pagesize + 64);
 776		memmove(data + dest_offset, data + src_offset, pagesize);
 777	}
 778
 779	return rc;
 780}
 781
 782/*
 783 * Writes an entire block of data and checks status after write.
 784 * Redundancy data must be already included in data. Data should be
 785 * (pagesize+64)*blocksize bytes in length.
 786 */
 787static int alauda_write_block(struct us_data *us, u16 pba, unsigned char *data)
 788{
 789	int rc;
 790	struct alauda_info *info = (struct alauda_info *) us->extra;
 791	unsigned char command[] = {
 792		ALAUDA_BULK_CMD, ALAUDA_BULK_WRITE_BLOCK, PBA_HI(pba),
 793		PBA_ZONE(pba), 0, PBA_LO(pba), 32, 0, MEDIA_PORT(us)
 794	};
 795
 796	US_DEBUGP("alauda_write_block: pba %d\n", pba);
 797
 798	rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 799		command, 9, NULL);
 800	if (rc != USB_STOR_XFER_GOOD)
 801		return rc;
 802
 803	rc = usb_stor_bulk_transfer_buf(us, info->wr_ep, data,
 804		(MEDIA_INFO(us).pagesize + 64) * MEDIA_INFO(us).blocksize,
 805		NULL);
 806	if (rc != USB_STOR_XFER_GOOD)
 807		return rc;
 808
 809	return alauda_check_status2(us);
 810}
 811
 812/*
 813 * Write some data to a specific LBA.
 814 */
 815static int alauda_write_lba(struct us_data *us, u16 lba,
 816		 unsigned int page, unsigned int pages,
 817		 unsigned char *ptr, unsigned char *blockbuffer)
 818{
 819	u16 pba, lbap, new_pba;
 820	unsigned char *bptr, *cptr, *xptr;
 821	unsigned char ecc[3];
 822	int i, result;
 823	unsigned int uzonesize = MEDIA_INFO(us).uzonesize;
 824	unsigned int zonesize = MEDIA_INFO(us).zonesize;
 825	unsigned int pagesize = MEDIA_INFO(us).pagesize;
 826	unsigned int blocksize = MEDIA_INFO(us).blocksize;
 827	unsigned int lba_offset = lba % uzonesize;
 828	unsigned int new_pba_offset;
 829	unsigned int zone = lba / uzonesize;
 830
 831	alauda_ensure_map_for_zone(us, zone);
 832
 833	pba = MEDIA_INFO(us).lba_to_pba[zone][lba_offset];
 834	if (pba == 1) {
 835		/* Maybe it is impossible to write to PBA 1.
 836		   Fake success, but don't do anything. */
 837		printk(KERN_WARNING
 838		       "alauda_write_lba: avoid writing to pba 1\n");
 839		return USB_STOR_TRANSPORT_GOOD;
 840	}
 841
 842	new_pba = alauda_find_unused_pba(&MEDIA_INFO(us), zone);
 843	if (!new_pba) {
 844		printk(KERN_WARNING
 845		       "alauda_write_lba: Out of unused blocks\n");
 846		return USB_STOR_TRANSPORT_ERROR;
 847	}
 848
 849	/* read old contents */
 850	if (pba != UNDEF) {
 851		result = alauda_read_block_raw(us, pba, 0,
 852			blocksize, blockbuffer);
 853		if (result != USB_STOR_XFER_GOOD)
 854			return result;
 855	} else {
 856		memset(blockbuffer, 0, blocksize * (pagesize + 64));
 857	}
 858
 859	lbap = (lba_offset << 1) | 0x1000;
 860	if (parity[MSB_of(lbap) ^ LSB_of(lbap)])
 861		lbap ^= 1;
 862
 863	/* check old contents and fill lba */
 864	for (i = 0; i < blocksize; i++) {
 865		bptr = blockbuffer + (i * (pagesize + 64));
 866		cptr = bptr + pagesize;
 867		nand_compute_ecc(bptr, ecc);
 868		if (!nand_compare_ecc(cptr+13, ecc)) {
 869			US_DEBUGP("Warning: bad ecc in page %d- of pba %d\n",
 870				  i, pba);
 871			nand_store_ecc(cptr+13, ecc);
 872		}
 873		nand_compute_ecc(bptr + (pagesize / 2), ecc);
 874		if (!nand_compare_ecc(cptr+8, ecc)) {
 875			US_DEBUGP("Warning: bad ecc in page %d+ of pba %d\n",
 876				  i, pba);
 877			nand_store_ecc(cptr+8, ecc);
 878		}
 879		cptr[6] = cptr[11] = MSB_of(lbap);
 880		cptr[7] = cptr[12] = LSB_of(lbap);
 881	}
 882
 883	/* copy in new stuff and compute ECC */
 884	xptr = ptr;
 885	for (i = page; i < page+pages; i++) {
 886		bptr = blockbuffer + (i * (pagesize + 64));
 887		cptr = bptr + pagesize;
 888		memcpy(bptr, xptr, pagesize);
 889		xptr += pagesize;
 890		nand_compute_ecc(bptr, ecc);
 891		nand_store_ecc(cptr+13, ecc);
 892		nand_compute_ecc(bptr + (pagesize / 2), ecc);
 893		nand_store_ecc(cptr+8, ecc);
 894	}
 895
 896	result = alauda_write_block(us, new_pba, blockbuffer);
 897	if (result != USB_STOR_XFER_GOOD)
 898		return result;
 899
 900	new_pba_offset = new_pba - (zone * zonesize);
 901	MEDIA_INFO(us).pba_to_lba[zone][new_pba_offset] = lba;
 902	MEDIA_INFO(us).lba_to_pba[zone][lba_offset] = new_pba;
 903	US_DEBUGP("alauda_write_lba: Remapped LBA %d to PBA %d\n",
 904		lba, new_pba);
 905
 906	if (pba != UNDEF) {
 907		unsigned int pba_offset = pba - (zone * zonesize);
 908		result = alauda_erase_block(us, pba);
 909		if (result != USB_STOR_XFER_GOOD)
 910			return result;
 911		MEDIA_INFO(us).pba_to_lba[zone][pba_offset] = UNDEF;
 912	}
 913
 914	return USB_STOR_TRANSPORT_GOOD;
 915}
 916
 917/*
 918 * Read data from a specific sector address
 919 */
 920static int alauda_read_data(struct us_data *us, unsigned long address,
 921		unsigned int sectors)
 922{
 923	unsigned char *buffer;
 924	u16 lba, max_lba;
 925	unsigned int page, len, offset;
 926	unsigned int blockshift = MEDIA_INFO(us).blockshift;
 927	unsigned int pageshift = MEDIA_INFO(us).pageshift;
 928	unsigned int blocksize = MEDIA_INFO(us).blocksize;
 929	unsigned int pagesize = MEDIA_INFO(us).pagesize;
 930	unsigned int uzonesize = MEDIA_INFO(us).uzonesize;
 931	struct scatterlist *sg;
 932	int result;
 933
 934	/*
 935	 * Since we only read in one block at a time, we have to create
 936	 * a bounce buffer and move the data a piece at a time between the
 937	 * bounce buffer and the actual transfer buffer.
 938	 * We make this buffer big enough to hold temporary redundancy data,
 939	 * which we use when reading the data blocks.
 940	 */
 941
 942	len = min(sectors, blocksize) * (pagesize + 64);
 943	buffer = kmalloc(len, GFP_NOIO);
 944	if (buffer == NULL) {
 945		printk(KERN_WARNING "alauda_read_data: Out of memory\n");
 946		return USB_STOR_TRANSPORT_ERROR;
 947	}
 948
 949	/* Figure out the initial LBA and page */
 950	lba = address >> blockshift;
 951	page = (address & MEDIA_INFO(us).blockmask);
 952	max_lba = MEDIA_INFO(us).capacity >> (blockshift + pageshift);
 953
 954	result = USB_STOR_TRANSPORT_GOOD;
 955	offset = 0;
 956	sg = NULL;
 957
 958	while (sectors > 0) {
 959		unsigned int zone = lba / uzonesize; /* integer division */
 960		unsigned int lba_offset = lba - (zone * uzonesize);
 961		unsigned int pages;
 962		u16 pba;
 963		alauda_ensure_map_for_zone(us, zone);
 964
 965		/* Not overflowing capacity? */
 966		if (lba >= max_lba) {
 967			US_DEBUGP("Error: Requested lba %u exceeds "
 968				  "maximum %u\n", lba, max_lba);
 969			result = USB_STOR_TRANSPORT_ERROR;
 970			break;
 971		}
 972
 973		/* Find number of pages we can read in this block */
 974		pages = min(sectors, blocksize - page);
 975		len = pages << pageshift;
 976
 977		/* Find where this lba lives on disk */
 978		pba = MEDIA_INFO(us).lba_to_pba[zone][lba_offset];
 979
 980		if (pba == UNDEF) {	/* this lba was never written */
 981			US_DEBUGP("Read %d zero pages (LBA %d) page %d\n",
 982				  pages, lba, page);
 983
 984			/* This is not really an error. It just means
 985			   that the block has never been written.
 986			   Instead of returning USB_STOR_TRANSPORT_ERROR
 987			   it is better to return all zero data. */
 988
 989			memset(buffer, 0, len);
 990		} else {
 991			US_DEBUGP("Read %d pages, from PBA %d"
 992				  " (LBA %d) page %d\n",
 993				  pages, pba, lba, page);
 994
 995			result = alauda_read_block(us, pba, page, pages, buffer);
 996			if (result != USB_STOR_TRANSPORT_GOOD)
 997				break;
 998		}
 999
1000		/* Store the data in the transfer buffer */
1001		usb_stor_access_xfer_buf(buffer, len, us->srb,
1002				&sg, &offset, TO_XFER_BUF);
1003
1004		page = 0;
1005		lba++;
1006		sectors -= pages;
1007	}
1008
1009	kfree(buffer);
1010	return result;
1011}
1012
1013/*
1014 * Write data to a specific sector address
1015 */
1016static int alauda_write_data(struct us_data *us, unsigned long address,
1017		unsigned int sectors)
1018{
1019	unsigned char *buffer, *blockbuffer;
1020	unsigned int page, len, offset;
1021	unsigned int blockshift = MEDIA_INFO(us).blockshift;
1022	unsigned int pageshift = MEDIA_INFO(us).pageshift;
1023	unsigned int blocksize = MEDIA_INFO(us).blocksize;
1024	unsigned int pagesize = MEDIA_INFO(us).pagesize;
1025	struct scatterlist *sg;
1026	u16 lba, max_lba;
1027	int result;
1028
1029	/*
1030	 * Since we don't write the user data directly to the device,
1031	 * we have to create a bounce buffer and move the data a piece
1032	 * at a time between the bounce buffer and the actual transfer buffer.
1033	 */
1034
1035	len = min(sectors, blocksize) * pagesize;
1036	buffer = kmalloc(len, GFP_NOIO);
1037	if (buffer == NULL) {
1038		printk(KERN_WARNING "alauda_write_data: Out of memory\n");
1039		return USB_STOR_TRANSPORT_ERROR;
1040	}
1041
1042	/*
1043	 * We also need a temporary block buffer, where we read in the old data,
1044	 * overwrite parts with the new data, and manipulate the redundancy data
1045	 */
1046	blockbuffer = kmalloc((pagesize + 64) * blocksize, GFP_NOIO);
1047	if (blockbuffer == NULL) {
1048		printk(KERN_WARNING "alauda_write_data: Out of memory\n");
1049		kfree(buffer);
1050		return USB_STOR_TRANSPORT_ERROR;
1051	}
1052
1053	/* Figure out the initial LBA and page */
1054	lba = address >> blockshift;
1055	page = (address & MEDIA_INFO(us).blockmask);
1056	max_lba = MEDIA_INFO(us).capacity >> (pageshift + blockshift);
1057
1058	result = USB_STOR_TRANSPORT_GOOD;
1059	offset = 0;
1060	sg = NULL;
1061
1062	while (sectors > 0) {
1063		/* Write as many sectors as possible in this block */
1064		unsigned int pages = min(sectors, blocksize - page);
1065		len = pages << pageshift;
1066
1067		/* Not overflowing capacity? */
1068		if (lba >= max_lba) {
1069			US_DEBUGP("alauda_write_data: Requested lba %u exceeds "
1070				  "maximum %u\n", lba, max_lba);
1071			result = USB_STOR_TRANSPORT_ERROR;
1072			break;
1073		}
1074
1075		/* Get the data from the transfer buffer */
1076		usb_stor_access_xfer_buf(buffer, len, us->srb,
1077				&sg, &offset, FROM_XFER_BUF);
1078
1079		result = alauda_write_lba(us, lba, page, pages, buffer,
1080			blockbuffer);
1081		if (result != USB_STOR_TRANSPORT_GOOD)
1082			break;
1083
1084		page = 0;
1085		lba++;
1086		sectors -= pages;
1087	}
1088
1089	kfree(buffer);
1090	kfree(blockbuffer);
1091	return result;
1092}
1093
1094/*
1095 * Our interface with the rest of the world
1096 */
1097
1098static void alauda_info_destructor(void *extra)
1099{
1100	struct alauda_info *info = (struct alauda_info *) extra;
1101	int port;
1102
1103	if (!info)
1104		return;
1105
1106	for (port = 0; port < 2; port++) {
1107		struct alauda_media_info *media_info = &info->port[port];
1108
1109		alauda_free_maps(media_info);
1110		kfree(media_info->lba_to_pba);
1111		kfree(media_info->pba_to_lba);
1112	}
1113}
1114
1115/*
1116 * Initialize alauda_info struct and find the data-write endpoint
1117 */
1118static int init_alauda(struct us_data *us)
1119{
1120	struct alauda_info *info;
1121	struct usb_host_interface *altsetting = us->pusb_intf->cur_altsetting;
1122	nand_init_ecc();
1123
1124	us->extra = kzalloc(sizeof(struct alauda_info), GFP_NOIO);
1125	if (!us->extra) {
1126		US_DEBUGP("init_alauda: Gah! Can't allocate storage for"
1127			"alauda info struct!\n");
1128		return USB_STOR_TRANSPORT_ERROR;
1129	}
1130	info = (struct alauda_info *) us->extra;
1131	us->extra_destructor = alauda_info_destructor;
1132
1133	info->wr_ep = usb_sndbulkpipe(us->pusb_dev,
1134		altsetting->endpoint[0].desc.bEndpointAddress
1135		& USB_ENDPOINT_NUMBER_MASK);
1136
1137	return USB_STOR_TRANSPORT_GOOD;
1138}
1139
1140static int alauda_transport(struct scsi_cmnd *srb, struct us_data *us)
1141{
1142	int rc;
1143	struct alauda_info *info = (struct alauda_info *) us->extra;
1144	unsigned char *ptr = us->iobuf;
1145	static unsigned char inquiry_response[36] = {
1146		0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
1147	};
1148
1149	if (srb->cmnd[0] == INQUIRY) {
1150		US_DEBUGP("alauda_transport: INQUIRY. "
1151			"Returning bogus response.\n");
1152		memcpy(ptr, inquiry_response, sizeof(inquiry_response));
1153		fill_inquiry_response(us, ptr, 36);
1154		return USB_STOR_TRANSPORT_GOOD;
1155	}
1156
1157	if (srb->cmnd[0] == TEST_UNIT_READY) {
1158		US_DEBUGP("alauda_transport: TEST_UNIT_READY.\n");
1159		return alauda_check_media(us);
1160	}
1161
1162	if (srb->cmnd[0] == READ_CAPACITY) {
1163		unsigned int num_zones;
1164		unsigned long capacity;
1165
1166		rc = alauda_check_media(us);
1167		if (rc != USB_STOR_TRANSPORT_GOOD)
1168			return rc;
1169
1170		num_zones = MEDIA_INFO(us).capacity >> (MEDIA_INFO(us).zoneshift
1171			+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
1172
1173		capacity = num_zones * MEDIA_INFO(us).uzonesize
1174			* MEDIA_INFO(us).blocksize;
1175
1176		/* Report capacity and page size */
1177		((__be32 *) ptr)[0] = cpu_to_be32(capacity - 1);
1178		((__be32 *) ptr)[1] = cpu_to_be32(512);
1179
1180		usb_stor_set_xfer_buf(ptr, 8, srb);
1181		return USB_STOR_TRANSPORT_GOOD;
1182	}
1183
1184	if (srb->cmnd[0] == READ_10) {
1185		unsigned int page, pages;
1186
1187		rc = alauda_check_media(us);
1188		if (rc != USB_STOR_TRANSPORT_GOOD)
1189			return rc;
1190
1191		page = short_pack(srb->cmnd[3], srb->cmnd[2]);
1192		page <<= 16;
1193		page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
1194		pages = short_pack(srb->cmnd[8], srb->cmnd[7]);
1195
1196		US_DEBUGP("alauda_transport: READ_10: page %d pagect %d\n",
1197			  page, pages);
1198
1199		return alauda_read_data(us, page, pages);
1200	}
1201
1202	if (srb->cmnd[0] == WRITE_10) {
1203		unsigned int page, pages;
1204
1205		rc = alauda_check_media(us);
1206		if (rc != USB_STOR_TRANSPORT_GOOD)
1207			return rc;
1208
1209		page = short_pack(srb->cmnd[3], srb->cmnd[2]);
1210		page <<= 16;
1211		page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
1212		pages = short_pack(srb->cmnd[8], srb->cmnd[7]);
1213
1214		US_DEBUGP("alauda_transport: WRITE_10: page %d pagect %d\n",
1215			  page, pages);
1216
1217		return alauda_write_data(us, page, pages);
1218	}
1219
1220	if (srb->cmnd[0] == REQUEST_SENSE) {
1221		US_DEBUGP("alauda_transport: REQUEST_SENSE.\n");
1222
1223		memset(ptr, 0, 18);
1224		ptr[0] = 0xF0;
1225		ptr[2] = info->sense_key;
1226		ptr[7] = 11;
1227		ptr[12] = info->sense_asc;
1228		ptr[13] = info->sense_ascq;
1229		usb_stor_set_xfer_buf(ptr, 18, srb);
1230
1231		return USB_STOR_TRANSPORT_GOOD;
1232	}
1233
1234	if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
1235		/* sure.  whatever.  not like we can stop the user from popping
1236		   the media out of the device (no locking doors, etc) */
1237		return USB_STOR_TRANSPORT_GOOD;
1238	}
1239
1240	US_DEBUGP("alauda_transport: Gah! Unknown command: %d (0x%x)\n",
1241		srb->cmnd[0], srb->cmnd[0]);
1242	info->sense_key = 0x05;
1243	info->sense_asc = 0x20;
1244	info->sense_ascq = 0x00;
1245	return USB_STOR_TRANSPORT_FAILED;
1246}
1247
1248static int alauda_probe(struct usb_interface *intf,
1249			 const struct usb_device_id *id)
1250{
1251	struct us_data *us;
1252	int result;
1253
1254	result = usb_stor_probe1(&us, intf, id,
1255			(id - alauda_usb_ids) + alauda_unusual_dev_list);
1256	if (result)
1257		return result;
1258
1259	us->transport_name  = "Alauda Control/Bulk";
1260	us->transport = alauda_transport;
1261	us->transport_reset = usb_stor_Bulk_reset;
1262	us->max_lun = 1;
1263
1264	result = usb_stor_probe2(us);
1265	return result;
1266}
1267
1268static struct usb_driver alauda_driver = {
1269	.name =		"ums-alauda",
1270	.probe =	alauda_probe,
1271	.disconnect =	usb_stor_disconnect,
1272	.suspend =	usb_stor_suspend,
1273	.resume =	usb_stor_resume,
1274	.reset_resume =	usb_stor_reset_resume,
1275	.pre_reset =	usb_stor_pre_reset,
1276	.post_reset =	usb_stor_post_reset,
1277	.id_table =	alauda_usb_ids,
1278	.soft_unbind =	1,
 
1279};
1280
1281static int __init alauda_init(void)
1282{
1283	return usb_register(&alauda_driver);
1284}
1285
1286static void __exit alauda_exit(void)
1287{
1288	usb_deregister(&alauda_driver);
1289}
1290
1291module_init(alauda_init);
1292module_exit(alauda_exit);