/* Driver for SanDisk SDDR-09 SmartMedia reader
*
* $Id: sddr09.c,v 1.24 2002/04/22 03:39:43 mdharm Exp $
* (c) 2000, 2001 Robert Baruch (autophile@starband.net)
* (c) 2002 Andries Brouwer (aeb@cwi.nl)
* Developed with the assistance of:
* (c) 2002 Alan Stern <stern@rowland.org>
*
* The SanDisk SDDR-09 SmartMedia reader uses the Shuttle EUSB-01 chip.
* This chip is a programmable USB controller. In the SDDR-09, it has
* been programmed to obey a certain limited set of SCSI commands.
* This driver translates the "real" SCSI commands to the SDDR-09 SCSI
* commands.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "transport.h"
#include "raw_bulk.h"
#include "protocol.h"
#include "usb.h"
#include "debug.h"
#include "sddr09.h"
#include <linux/version.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/slab.h>
#define short_pack(lsb,msb) ( ((u16)(lsb)) | ( ((u16)(msb))<<8 ) )
#define LSB_of(s) ((s)&0xFF)
#define MSB_of(s) ((s)>>8)
/* #define US_DEBUGP printk */
/*
* First some stuff that does not belong here:
* data on SmartMedia and other cards, completely
* unrelated to this driver.
* Similar stuff occurs in <linux/mtd/nand_ids.h>.
*/
struct nand_flash_dev {
int model_id;
int chipshift; /* 1<<cs bytes total capacity */
char pageshift; /* 1<<ps bytes in a page */
char blockshift; /* 1<<bs pages in an erase block */
char zoneshift; /* 1<<zs blocks in a zone */
/* # of logical blocks is 125/128 of this */
char pageadrlen; /* length of an address in bytes - 1 */
};
/*
* NAND Flash Manufacturer ID Codes
*/
#define NAND_MFR_AMD 0x01
#define NAND_MFR_NS 0x8f
#define NAND_MFR_TOSHIBA 0x98
#define NAND_MFR_SAMSUNG 0xec
static inline char *nand_flash_manufacturer(int manuf_id) {
switch(manuf_id) {
case NAND_MFR_AMD:
return "AMD";
case NAND_MFR_NS:
return "NS";
case NAND_MFR_TOSHIBA:
return "Toshiba";
case NAND_MFR_SAMSUNG:
return "Samsung";
default:
return "unknown";
}
}
/*
* It looks like it is unnecessary to attach manufacturer to the
* remaining data: SSFDC prescribes manufacturer-independent id codes.
*
* 256 MB NAND flash has a 5-byte ID with 2nd byte 0xaa, 0xba, 0xca or 0xda.
*/
static struct nand_flash_dev nand_flash_ids[] = {
/* NAND flash */
{ 0x6e, 20, 8, 4, 8, 2}, /* 1 MB */
{ 0xe8, 20, 8, 4, 8, 2}, /* 1 MB */
{ 0xec, 20, 8, 4, 8, 2}, /* 1 MB */
{ 0x64, 21, 8, 4, 9, 2}, /* 2 MB */
{ 0xea, 21, 8, 4, 9, 2}, /* 2 MB */
{ 0x6b, 22, 9, 4, 9, 2}, /* 4 MB */
{ 0xe3, 22, 9, 4, 9, 2}, /* 4 MB */
{ 0xe5, 22, 9, 4, 9, 2}, /* 4 MB */
{ 0xe6, 23, 9, 4, 10, 2}, /* 8 MB */
{ 0x73, 24, 9, 5, 10, 2}, /* 16 MB */
{ 0x75, 25, 9, 5, 10, 2}, /* 32 MB */
{ 0x76, 26, 9, 5, 10, 3}, /* 64 MB */
{ 0x79, 27, 9, 5, 10, 3}, /* 128 MB */
/* MASK ROM */
{ 0x5d, 21, 9, 4, 8, 2}, /* 2 MB */
{ 0xd5, 22, 9, 4, 9, 2}, /* 4 MB */
{ 0xd6, 23, 9, 4, 10, 2}, /* 8 MB */
{ 0x57, 24, 9, 4, 11, 2}, /* 16 MB */
{ 0x58, 25, 9, 4, 12, 2}, /* 32 MB */
{ 0,}
};
#define SIZE(a) (sizeof(a)/sizeof((a)[0]))
static struct nand_flash_dev *
nand_find_id(unsigned char id) {
int i;
for (i = 0; i < SIZE(nand_flash_ids); i++)
if (nand_flash_ids[i].model_id == id)
return &(nand_flash_ids[i]);
return NULL;
}
/*
* ECC computation.
*/
static unsigned char parity[256];
static unsigned char ecc2[256];
static void nand_init_ecc(void) {
int i, j, a;
parity[0] = 0;
for (i = 1; i < 256; i++)
parity[i] = (parity[i&(i-1)] ^ 1);
for (i = 0; i < 256; i++) {
a = 0;
for (j = 0; j < 8; j++) {
if (i & (1<<j)) {
if ((j & 1) == 0)
a ^= 0x04;
if ((j & 2) == 0)
a ^= 0x10;
if ((j & 4) == 0)
a ^= 0x40;
}
}
ecc2[i] = ~(a ^ (a<<1) ^ (parity[i] ? 0xa8 : 0));
}
}
/* compute 3-byte ecc on 256 bytes */
static void nand_compute_ecc(unsigned char *data, unsigned char *ecc) {
int i, j, a;
unsigned char par, bit, bits[8];
par = 0;
for (j = 0; j < 8; j++)
bits[j] = 0;
/* collect 16 checksum bits */
for (i = 0; i < 256; i++) {
par ^= data[i];
bit = parity[data[i]];
for (j = 0; j < 8; j++)
if ((i & (1<<j)) == 0)
bits[j] ^= bit;
}
/* put 4+4+4 = 12 bits in the ecc */
a = (bits[3] << 6) + (bits[2] << 4) + (bits[1] << 2) + bits[0];
ecc[0] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0));
a = (bits[7] << 6) + (bits[6] << 4) + (bits[5] << 2) + bits[4];
ecc[1] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0));
ecc[2] = ecc2[par];
}
static int nand_compare_ecc(unsigned char *data, unsigned char *ecc) {
return (data[0] == ecc[0] && data[1] == ecc[1] && data[2] == ecc[2]);
}
static void nand_store_ecc(unsigned char *data, unsigned char *ecc) {
memcpy(data, ecc, 3);
}
/*
* The actual driver starts here.
*/
/*
* On my 16MB card, control blocks have size 64 (16 real control bytes,
* and 48 junk bytes). In reality of course the card uses 16 control bytes,
* so the reader makes up the remaining 48. Don't know whether these numbers
* depend on the card. For now a constant.
*/
#define CONTROL_SHIFT 6
/*
* On my Combo CF/SM reader, the SM reader has LUN 1.
* (and things fail with LUN 0).
* It seems LUN is irrelevant for others.
*/
#define LUN 1
#define LUNBITS (LUN << 5)
/*
* LBA and PBA are unsigned ints. Special values.
*/
#define UNDEF 0xffffffff
#define SPARE 0xfffffffe
#define UNUSABLE 0xfffffffd
static int erase_bad_lba_entries = 0;
/* send vendor interface command (0x41) */
/* called for requests 0, 1, 8 */
static int
sddr09_send_command(struct us_data *us,
unsigned char request,
unsigned char direction,
unsigned char *xfer_data,
unsigned int xfer_len) {
unsigned int pipe;
unsigned char requesttype = (0x41 | direction);
int rc;
// Get the receive or send control pipe number
if (direction == USB_DIR_IN)
pipe = us->recv_ctrl_pipe;
else
pipe = us->send_ctrl_pipe;
rc = usb_stor_ctrl_transfer(us, pipe, request, requesttype,
0, 0, xfer_data, xfer_len);
return (rc == USB_STOR_XFER_GOOD ? USB_STOR_TRANSPORT_GOOD :
USB_STOR_TRANSPORT_ERROR);
}
static int
sddr09_send_scsi_command(struct us_data *us,
unsigned char *command,
unsigned int command_len) {
return sddr09_send_command(us, 0, USB_DIR_OUT, command, command_len);
}
#if 0
/*
* Test Unit Ready Command: 12 bytes.
* byte 0: opcode: 00
*/
static int
sddr09_test_unit_ready(struct us_data *us) {
unsigned char *command = us->iobuf;
int result;
memset(command, 0, 6);
command[1] = LUNBITS;
result = sddr09_send_scsi_command(us, command, 6);
US_DEBUGP("sddr09_test_unit_ready returns %d\n", result);
return result;
}
#endif
/*
* Request Sense Command: 12 bytes.
* byte 0: opcode: 03
* byte 4: data length
*/
static int
sddr09_request_sense(struct us_data *us, unsigned char *sensebuf, int buflen) {
unsigned char *command = us->iobuf;
int result;
memset(command, 0, 12);
command[0] = 0x03;
command[1] = LUNBITS;
command[4] = buflen;
result = sddr09_send_scsi_command(us, command, 12);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("request sense failed\n");
return result;
}
result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
sensebuf, buflen, NULL);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP("request sense bulk in failed\n");
return USB_STOR_TRANSPORT_ERROR;
}
else {
US_DEBUGP("request sense worked\n");
return USB_STOR_TRANSPORT_GOOD;
}
}
/*
* Read Command: 12 bytes.
* byte 0: opcode: E8
* byte 1: last two bits: 00: read data, 01: read blockwise control,
* 10: read both, 11: read pagewise control.
* It turns out we need values 20, 21, 22, 23 here (LUN 1).
* bytes 2-5: address (interpretation depends on byte 1, see below)
* bytes 10-11: count (idem)
*
* A page has 512 data bytes and 64 control bytes (16 control and 48 junk).
* A read data command gets data in 512-byte pages.
* A read control command gets control in 64-byte chunks.
* A read both command gets data+control in 576-byte chunks.
*
* Blocks are groups of 32 pages, and read blockwise control jumps to the
* next block, while read pagewise control jumps to the next page after
* reading a group of 64 control bytes.
* [Here 512 = 1<<pageshift, 32 = 1<<blockshift, 64 is constant?]
*
* (1 MB and 2 MB cards are a bit different, but I have only a 16 MB card.)
*/
static int
sddr09_readX(struct us_data *us, int x, unsigned long fromaddress,
int nr_of_pages, int bulklen, unsigned char *buf,
int use_sg) {
unsigned char *command = us->iobuf;
int result;
command[0] = 0xE8;
command[1] = LUNBITS | x;
command[2] = MSB_of(fromaddress>>16);
command[3] = LSB_of(fromaddress>>16);
command[4] = MSB_of(fromaddress & 0xFFFF);
command[5] = LSB_of(fromaddress & 0xFFFF);
command[6] = 0;
command[7] = 0;
command[8] = 0;
command[9] = 0;
command[10] = MSB_of(nr_of_pages);
command[11] = LSB_of(nr_of_pages);
result = sddr09_send_scsi_command(us, command, 12);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("Result for send_control in sddr09_read2%d %d\n",
x, result);
return result;
}
result = usb_stor_bulk_transfer_sg(us, us->recv_bulk_pipe,
buf, bulklen, use_sg, NULL);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP("Result for bulk_transfer in sddr09_read2%d %d\n",
x, result);
return USB_STOR_TRANSPORT_ERROR;
}
return USB_STOR_TRANSPORT_GOOD;
}
/*
* Read Data
*
* fromaddress counts data shorts:
* increasing it by 256 shifts the bytestream by 512 bytes;
* the last 8 bits are ignored.
*
* nr_of_pages counts pages of size (1 << pageshift).
*/
static int
sddr09_read20(struct us_data *us, unsigned long fromaddress,
int nr_of_pages, int pageshift, unsigned char *buf, int use_sg) {
int bulklen = nr_of_pages << pageshift;
/* The last 8 bits of fromaddress are ignored. */
return sddr09_readX(us, 0, fromaddress, nr_of_pages, bulklen,
buf, use_sg);
}
/*
* Read Blockwise Control
*
* fromaddress gives the starting position (as in read data;
* the last 8 bits are ignored); increasing it by 32*256 shifts
* the output stream by 64 bytes.
*
* count counts control groups of size (1 << controlshift).
* For me, controlshift = 6. Is this constant?
*
* After getting one control group, jump to the next block
* (fromaddress += 8192).
*/
static int
sddr09_read21(struct us_data *us, unsigned long fromaddress,
int count, int controlshift, unsigned char *buf, int use_sg) {
int bulklen = (count << controlshift);
return sddr09_readX(us, 1, fromaddress, count, bulklen,
buf, use_sg);
}
/*
* Read both Data and Control
*
* fromaddress counts data shorts, ignoring control:
* increasing it by 256 shifts the bytestream by 576 = 512+64 bytes;
* the last 8 bits are ignored.
*
* nr_of_pages counts pages of size (1 << pageshift) + (1 << controlshift).
*/
static int
sddr09_read22(struct us_data *us, unsigned long fromaddress,
int nr_of_pages, int pageshift, unsigned char *buf, int use_sg) {
int bulklen = (nr_of_pages << pageshift) + (nr_of_pages << CONTROL_SHIFT);
US_DEBUGP("sddr09_read22: reading %d pages, %d bytes\n",
nr_of_pages, bulklen);
return sddr09_readX(us, 2, fromaddress, nr_of_pages, bulklen,
buf, use_sg);
}
#if 0
/*
* Read Pagewise Control
*
* fromaddress gives the starting position (as in read data;
* the last 8 bits are ignored); increasing it by 256 shifts
* the output stream by 64 bytes.
*
* count counts control groups of size (1 << controlshift).
* For me, controlshift = 6. Is this constant?
*
* After getting one control group, jump to the next page
* (fromaddress += 256).
*/
static int
sddr09_read23(struct us_data *us, unsigned long fromaddress,
int count, int controlshift, unsigned char *buf, int use_sg) {
int bulklen = (count << controlshift);
return sddr09_readX(us, 3, fromaddress, count, bulklen,
buf, use_sg);
}
#endif
/*
* Erase Command: 12 bytes.
* byte 0: opcode: EA
* bytes 6-9: erase address (big-endian, counting shorts, sector aligned).
*
* Always precisely one block is erased; bytes 2-5 and 10-11 are ignored.
* The byte address being erased is 2*Eaddress.
*/
static int
sddr09_erase(struct us_data *us, unsigned long Eaddress) {
unsigned char *command = us->iobuf;
int result;
memset(command, 0, 12);
command[0] = 0xEA;
command[1] = LUNBITS;
command[6] = MSB_of(Eaddress>>16);
command[7] = LSB_of(Eaddress>>16);
command[8] = MSB_of(Eaddress & 0xFFFF);
command[9] = LSB_of(Eaddress & 0xFFFF);
result = sddr09_send_scsi_command(us, command, 12);
if (result != USB_STOR_TRANSPORT_GOOD)
US_DEBUGP("Result for send_control in sddr09_erase %d\n",
result);
return result;
}
/*
* Write Command: 12 bytes.
* byte 0: opcode: E9
* bytes 2-5: write address (big-endian, counting shorts, sector aligned).
* bytes 6-9: erase address (big-endian, counting shorts, sector aligned).
* bytes 10-11: sector count (big-endian, in 512-byte sectors).
*
* If write address equals erase address, the erase is done first,
* otherwise the write is done first. When erase address equals zero
* no erase is done?
*/
static int
sddr09_writeX(struct us_data *us,
unsigned long Waddress, unsigned long Eaddress,
int nr_of_pages, int bulklen, unsigned char *buf, int use_sg) {
unsigned char *command = us->iobuf;
int result;
command[0] = 0xE9;
command[1] = LUNBITS;
command[2] = MSB_of(Waddress>>16);
command[3] = LSB_of(Waddress>>16);
command[4] = MSB_of(Waddress & 0xFFFF);
command[5] = LSB_of(Waddress & 0xFFFF);
command[6] = MSB_of(Eaddress>>16);
command[7] = LSB_of(Eaddress>>16);
command[8] = MSB_of(Eaddress & 0xFFFF);
command[9] = LSB_of(Eaddress & 0xFFFF);
command[10] = MSB_of(nr_of_pages);
command[11] = LSB_of(nr_of_pages);
result = sddr09_send_scsi_command(us, command, 12);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("Result for send_control in sddr09_writeX %d\n",
result);
return result;
}
result = usb_stor_bulk_transfer_sg(us, us->send_bulk_pipe,
buf, bulklen, use_sg, NULL);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP("Result for bulk_transfer in sddr09_writeX %d\n",
result);
return USB_STOR_TRANSPORT_ERROR;
}
return USB_STOR_TRANSPORT_GOOD;
}
/* erase address, write same address */
static int
sddr09_write_inplace(struct us_data *us, unsigned long address,
int nr_of_pages, int pageshift, unsigned char *buf,
int use_sg) {
int bulklen = (nr_of_pages << pageshift) + (nr_of_pages << CONTROL_SHIFT);
return sddr09_writeX(us, address, address, nr_of_pages, bulklen,
buf, use_sg);
}
#if 0
/*
* Read Scatter Gather Command: 3+4n bytes.
* byte 0: opcode E7
* byte 2: n
* bytes 4i-1,4i,4i+1: page address
* byte 4i+2: page count
* (i=1..n)
*
* This reads several pages from the card to a single memory buffer.
* The last two bits of byte 1 have the same meaning as for E8.
*/
static int
sddr09_read_sg_test_only(struct us_data *us) {
unsigned char *command = us->iobuf;
int result, bulklen, nsg, ct;
unsigned char *buf;
unsigned long address;
nsg = bulklen = 0;
command[0] = 0xE7;
command[1] = LUNBITS;
command[2] = 0;
address = 040000; ct = 1;
nsg++;
bulklen += (ct << 9);
command[4*nsg+2] = ct;
command[4*nsg+1] = ((address >> 9) & 0xFF);
command[4*nsg+0] = ((address >> 17) & 0xFF);
command[4*nsg-1] = ((address >> 25) & 0xFF);
address = 0340000; ct = 1;
nsg++;
bulklen += (ct << 9);
command[4*nsg+2] = ct;
command[4*nsg+1] = ((address >> 9) & 0xFF);
command[4*nsg+0] = ((address >> 17) & 0xFF);
command[4*nsg-1] = ((address >> 25) & 0xFF);
address = 01000000; ct = 2;
nsg++;
bulklen += (ct << 9);
command[4*nsg+2] = ct;
command[4*nsg+1] = ((address >> 9) & 0xFF);
command[4*nsg+0] = ((address >> 17) & 0xFF);
command[4*nsg-1] = ((address >> 25) & 0xFF);
command[2] = nsg;
result = sddr09_send_scsi_command(us, command, 4*nsg+3);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("Result for send_control in sddr09_read_sg %d\n",
result);
return result;
}
buf = (unsigned char *) kmalloc(bulklen, GFP_NOIO);
if (!buf)
return USB_STOR_TRANSPORT_ERROR;
result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
buf, bulklen, NULL);
kfree(buf);
if (result != USB_STOR_XFER_GOOD) {
US_DEBUGP("Result for bulk_transfer in sddr09_read_sg %d\n",
result);
return USB_STOR_TRANSPORT_ERROR;
}
return USB_STOR_TRANSPORT_GOOD;
}
#endif
/*
* Read Status Command: 12 bytes.
* byte 0: opcode: EC
*
* Returns 64 bytes, all zero except for the first.
* bit 0: 1: Error
* bit 5: 1: Suspended
* bit 6: 1: Ready
* bit 7: 1: Not write-protected
*/
static int
sddr09_read_status(struct us_data *us, unsigned char *status) {
unsigned char *command = us->iobuf;
unsigned char *data = us->iobuf;
int result;
US_DEBUGP("Reading status...\n");
memset(command, 0, 12);
command[0] = 0xEC;
command[1] = LUNBITS;
result = sddr09_send_scsi_command(us, command, 12);
if (result != USB_STOR_TRANSPORT_GOOD)
return result;
result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
data, 64, NULL);
*status = data[0];
return (result == USB_STOR_XFER_GOOD ?
USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
}
static int
sddr09_read_data(struct us_data *us,
unsigned long address,
unsigned int sectors,
unsigned char *content,
int use_sg) {
struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
unsigned int lba, maxlba, pba;
unsigned int page, pages;
unsigned char *buffer = NULL;
unsigned char *ptr;
int result, len;
// If we're using scatter-gather, we have to create a new
// buffer to read all of the data in first, since a
// scatter-gather buffer could in theory start in the middle
// of a page, which would be bad. A developer who wants a
// challenge might want to write a limited-buffer
// version of this code.
len = sectors*info->pagesize;
buffer = (use_sg ? kmalloc(len, GFP_NOIO) : content);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
ptr = buffer;
// Figure out the initial LBA and page
lba = address >> info->blockshift;
page = (address & info->blockmask);
maxlba = info->capacity >> (info->pageshift + info->blockshift);
// This could be made much more efficient by checking for
// contiguous LBA's. Another exercise left to the student.
result = USB_STOR_TRANSPORT_GOOD;
while (sectors > 0) {
/* Find number of pages we can read in this block */
pages = info->blocksize - page;
if (pages > sectors)
pages = sectors;
/* Not overflowing capacity? */
if (lba >= maxlba) {
US_DEBUGP("Error: Requested lba %u exceeds "
"maximum %u\n", lba, maxlba);
result = USB_STOR_TRANSPORT_ERROR;
break;
}
/* Find where this lba lives on disk */
pba = info->lba_to_pba[lba];
if (pba == UNDEF) { /* this lba was never written */
US_DEBUGP("Read %d zero pages (LBA %d) page %d\n",
pages, lba, page);
/* This is not really an error. It just means
that the block has never been written.
Instead of returning USB_STOR_TRANSPORT_ERROR
it is better to return all zero data. */
memset(ptr, 0, pages << info->pageshift);
} else {
US_DEBUGP("Read %d pages, from PBA %d"
" (LBA %d) page %d\n",
pages, pba, lba, page);
address = ((pba << info->blockshift) + page) <<
info->pageshift;
result = sddr09_read20(us, address>>1,
pages, info->pageshift, ptr, 0);
if (result != USB_STOR_TRANSPORT_GOOD)
break;
}
page = 0;
lba++;
sectors -= pages;
ptr += (pages << info->pageshift);
}
if (use_sg && result == USB_STOR_TRANSPORT_GOOD)
us_copy_to_sgbuf_all(buffer, len, content, use_sg);
if (use_sg)
kfree(buffer);
return result;
}
/* we never free blocks, so lastpba can only increase */
static unsigned int
sddr09_find_unused_pba(struct sddr09_card_info *info) {
static unsigned int lastpba = 1;
int numblocks = info->capacity >> (info->blockshift + info->pageshift);
int i;
for (i = lastpba+1; i < numblocks; i++) {
if (info->pba_to_lba[i] == UNDEF) {
lastpba = i;
return i;
}
}
return 0;
}
static int
sddr09_write_lba(struct us_data *us, unsigned int lba,
unsigned int page, unsigned int pages,
unsigned char *ptr) {
struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
unsigned long address;
unsigned int pba, lbap;
unsigned int pagelen, blocklen;
unsigned char *blockbuffer, *bptr, *cptr, *xptr;
unsigned char ecc[3];
int i, result;
lbap = ((lba & 0x3ff) << 1) | 0x1000;
if (parity[MSB_of(lbap) ^ LSB_of(lbap)])
lbap ^= 1;
pba = info->lba_to_pba[lba];
if (pba == UNDEF) {
pba = sddr09_find_unused_pba(info);
if (!pba) {
printk("sddr09_write_lba: Out of unused blocks\n");
return USB_STOR_TRANSPORT_ERROR;
}
info->pba_to_lba[pba] = lba;
info->lba_to_pba[lba] = pba;
}
if (pba == 1) {
/* Maybe it is impossible to write to PBA 1.
Fake success, but don't do anything. */
printk("sddr09: avoid writing to pba 1\n");
return USB_STOR_TRANSPORT_GOOD;
}
pagelen = (1 << info->pageshift) + (1 << CONTROL_SHIFT);
blocklen = (pagelen << info->blockshift);
blockbuffer = kmalloc(blocklen, GFP_NOIO);
if (!blockbuffer) {
printk("sddr09_write_lba: Out of memory\n");
return USB_STOR_TRANSPORT_ERROR;
}
/* read old contents */
address = (pba << (info->pageshift + info->blockshift));
result = sddr09_read22(us, address>>1, info->blocksize,
info->pageshift, blockbuffer, 0);
if (result != USB_STOR_TRANSPORT_GOOD)
goto err;
/* check old contents */
for (i = 0; i < info->blockshift; i++) {
bptr = blockbuffer + i*pagelen;
cptr = bptr + info->pagesize;
nand_compute_ecc(bptr, ecc);
if (!nand_compare_ecc(cptr+13, ecc)) {
US_DEBUGP("Warning: bad ecc in page %d- of pba %d\n",
i, pba);
nand_store_ecc(cptr+13, ecc);
}
nand_compute_ecc(bptr+(info->pagesize / 2), ecc);
if (!nand_compare_ecc(cptr+8, ecc)) {
US_DEBUGP("Warning: bad ecc in page %d+ of pba %d\n",
i, pba);
nand_store_ecc(cptr+8, ecc);
}
}
/* copy in new stuff and compute ECC */
xptr = ptr;
for (i = page; i < page+pages; i++) {
bptr = blockbuffer + i*pagelen;
cptr = bptr + info->pagesize;
memcpy(bptr, xptr, info->pagesize);
xptr += info->pagesize;
nand_compute_ecc(bptr, ecc);
nand_store_ecc(cptr+13, ecc);
nand_compute_ecc(bptr+(info->pagesize / 2), ecc);
nand_store_ecc(cptr+8, ecc);
cptr[6] = cptr[11] = MSB_of(lbap);
cptr[7] = cptr[12] = LSB_of(lbap);
}
US_DEBUGP("Rewrite PBA %d (LBA %d)\n", pba, lba);
result = sddr09_write_inplace(us, address>>1, info->blocksize,
info->pageshift, blockbuffer, 0);
US_DEBUGP("sddr09_write_inplace returns %d\n", result);
#if 0
{
unsigned char status = 0;
int result2 = sddr09_read_status(us, &status);
if (result2 != USB_STOR_TRANSPORT_GOOD)
US_DEBUGP("sddr09_write_inplace: cannot read status\n");
else if (status != 0xc0)
US_DEBUGP("sddr09_write_inplace: status after write: 0x%x\n",
status);
}
#endif
#if 0
{
int result2 = sddr09_test_unit_ready(us);
}
#endif
err:
kfree(blockbuffer);
/* TODO: instead of doing kmalloc/kfree for each block,
add a bufferpointer to the info structure */
return result;
}
static int
sddr09_write_data(struct us_data *us,
unsigned long address,
unsigned int sectors,
unsigned char *content,
int use_sg) {
struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
unsigned int lba, page, pages;
unsigned char *buffer = NULL;
unsigned char *ptr;
int result, len;
len = sectors*info->pagesize;
buffer = us_copy_from_sgbuf_all(content, len, use_sg);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
ptr = buffer;
// Figure out the initial LBA and page
lba = address >> info->blockshift;
page = (address & info->blockmask);
result = USB_STOR_TRANSPORT_GOOD;
while (sectors > 0) {
// Write as many sectors as possible in this block
pages = info->blocksize - page;
if (pages > sectors)
pages = sectors;
result = sddr09_write_lba(us, lba, page, pages, ptr);
if (result != USB_STOR_TRANSPORT_GOOD)
break;
page = 0;
lba++;
sectors -= pages;
ptr += (pages << info->pageshift);
}
if (use_sg)
kfree(buffer);
return result;
}
static int
sddr09_read_control(struct us_data *us,
unsigned long address,
unsigned int blocks,
unsigned char *content,
int use_sg) {
US_DEBUGP("Read control address %08lX blocks %04X\n",
address, blocks);
return sddr09_read21(us, address, blocks, CONTROL_SHIFT, content, use_sg);
}
/*
* Read Device ID Command: 12 bytes.
* byte 0: opcode: ED
*
* Returns 2 bytes: Manufacturer ID and Device ID.
* On more recent cards 3 bytes: the third byte is an option code A5
* signifying that the secret command to read an 128-bit ID is available.
* On still more recent cards 4 bytes: the fourth byte C0 means that
* a second read ID cmd is available.
*/
static int
sddr09_read_deviceID(struct us_data *us, unsigned char *deviceID) {
unsigned char *command = us->iobuf;
unsigned char *content = us->iobuf;
int result, i;
memset(command, 0, 12);
command[0] = 0xED;
command[1] = LUNBITS;
result = sddr09_send_scsi_command(us, command, 12);
if (result != USB_STOR_TRANSPORT_GOOD)
return result;
result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
content, 64, NULL);
for (i = 0; i < 4; i++)
deviceID[i] = content[i];
return (result == USB_STOR_XFER_GOOD ?
USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
}
static int
sddr09_get_wp(struct us_data *us, struct sddr09_card_info *info) {
int result;
unsigned char status;
result = sddr09_read_status(us, &status);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("sddr09_get_wp: read_status fails\n");
return result;
}
US_DEBUGP("sddr09_get_wp: status %02X", status);
if ((status & 0x80) == 0) {
info->flags |= SDDR09_WP; /* write protected */
US_DEBUGP(" WP");
}
if (status & 0x40)
US_DEBUGP(" Ready");
if (status & LUNBITS)
US_DEBUGP(" Suspended");
if (status & 0x1)
US_DEBUGP(" Error");
US_DEBUGP("\n");
return USB_STOR_TRANSPORT_GOOD;
}
#if 0
/*
* Reset Command: 12 bytes.
* byte 0: opcode: EB
*/
static int
sddr09_reset(struct us_data *us) {
unsigned char *command = us->iobuf;
memset(command, 0, 12);
command[0] = 0xEB;
command[1] = LUNBITS;
return sddr09_send_scsi_command(us, command, 12);
}
#endif
static struct nand_flash_dev *
sddr09_get_cardinfo(struct us_data *us, unsigned char flags) {
struct nand_flash_dev *cardinfo;
unsigned char deviceID[4];
char blurbtxt[256];
int result;
US_DEBUGP("Reading capacity...\n");
result = sddr09_read_deviceID(us, deviceID);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("Result of read_deviceID is %d\n", result);
printk("sddr09: could not read card info\n");
return 0;
}
sprintf(blurbtxt, "sddr09: Found Flash card, ID = %02X %02X %02X %02X",
deviceID[0], deviceID[1], deviceID[2], deviceID[3]);
/* Byte 0 is the manufacturer */
sprintf(blurbtxt + strlen(blurbtxt),
": Manuf. %s",
nand_flash_manufacturer(deviceID[0]));
/* Byte 1 is the device type */
cardinfo = nand_find_id(deviceID[1]);
if (cardinfo) {
/* MB or MiB? It is neither. A 16 MB card has
17301504 raw bytes, of which 16384000 are
usable for user data. */
sprintf(blurbtxt + strlen(blurbtxt),
", %d MB", 1<<(cardinfo->chipshift - 20));
} else {
sprintf(blurbtxt + strlen(blurbtxt),
", type unrecognized");
}
/* Byte 2 is code to signal availability of 128-bit ID */
if (deviceID[2] == 0xa5) {
sprintf(blurbtxt + strlen(blurbtxt),
", 128-bit ID");
}
/* Byte 3 announces the availability of another read ID command */
if (deviceID[3] == 0xc0) {
sprintf(blurbtxt + strlen(blurbtxt),
", extra cmd");
}
if (flags & SDDR09_WP)
sprintf(blurbtxt + strlen(blurbtxt),
", WP");
printk("%s\n", blurbtxt);
return cardinfo;
}
static int
sddr09_read_map(struct us_data *us) {
struct scatterlist *sg;
struct sddr09_card_info *info = (struct sddr09_card_info *) us->extra;
int numblocks, alloc_len, alloc_blocks;
int i, j, result;
unsigned char *ptr;
unsigned int lba, lbact;
if (!info->capacity)
return -1;
// read 64 (1<<6) bytes for every block
// ( 1 << ( blockshift + pageshift ) bytes)
// of capacity:
// (1<<6)*capacity/(1<<(b+p)) =
// ((1<<6)*capacity)>>(b+p) =
// capacity>>(b+p-6)
alloc_len = info->capacity >>
(info->blockshift + info->pageshift - CONTROL_SHIFT);
// Allocate a number of scatterlist structures according to
// the number of 128k blocks in the alloc_len. Adding 128k-1
// and then dividing by 128k gives the correct number of blocks.
// 128k = 1<<17
alloc_blocks = (alloc_len + (1<<17) - 1) >> 17;
sg = kmalloc(alloc_blocks*sizeof(struct scatterlist),
GFP_NOIO);
if (sg == NULL)
return 0;
for (i=0; i<alloc_blocks; i++) {
int alloc_req = (i < alloc_blocks-1 ? 1 << 17 : alloc_len);
char *vaddr = kmalloc(alloc_req, GFP_NOIO);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,3)
sg[i].page = virt_to_page(vaddr);
sg[i].offset = offset_in_page(vaddr);
#else
sg[i].address = vaddr;
#endif
sg[i].length = alloc_req;
alloc_len -= alloc_req;
}
for (i=0; i<alloc_blocks; i++)
if (sg[i].page == NULL) {
for (i=0; i<alloc_blocks; i++)
if (sg[i].page != NULL)
kfree(sg_address(sg[i]));
kfree(sg);
return 0;
}
numblocks = info->capacity >> (info->blockshift + info->pageshift);
result = sddr09_read_control(us, 0, numblocks,
(unsigned char *)sg, alloc_blocks);
if (result != USB_STOR_TRANSPORT_GOOD) {
for (i=0; i<alloc_blocks; i++)
kfree(sg_address(sg[i]));
kfree(sg);
return -1;
}
kfree(info->lba_to_pba);
kfree(info->pba_to_lba);
info->lba_to_pba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
info->pba_to_lba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
if (info->lba_to_pba == NULL || info->pba_to_lba == NULL) {
kfree(info->lba_to_pba);
kfree(info->pba_to_lba);
info->lba_to_pba = NULL;
info->pba_to_lba = NULL;
for (i=0; i<alloc_blocks; i++)
kfree(sg_address(sg[i]));
kfree(sg);
return 0;
}
for (i = 0; i < numblocks; i++)
info->lba_to_pba[i] = info->pba_to_lba[i] = UNDEF;
ptr = sg_address(sg[0]);
/*
* Define lba-pba translation table
*/
// Each block is 64 bytes of control data, so block i is located in
// scatterlist block i*64/128k = i*(2^6)*(2^-17) = i*(2^-11)
for (i=0; i<numblocks; i++) {
ptr = sg_address(sg[i>>11]) + ((i&0x7ff)<<6);
if (i == 0 || i == 1) {
info->pba_to_lba[i] = UNUSABLE;
continue;
}
/* special PBAs have control field 0^16 */
for (j = 0; j < 16; j++)
if (ptr[j] != 0)
goto nonz;
info->pba_to_lba[i] = UNUSABLE;
printk("sddr09: PBA %04X has no logical mapping\n", i);
continue;
nonz:
/* unwritten PBAs have control field FF^16 */
for (j = 0; j < 16; j++)
if (ptr[j] != 0xff)
goto nonff;
continue;
nonff:
/* normal PBAs start with six FFs */
if (j < 6) {
printk("sddr09: PBA %04X has no logical mapping: "
"reserved area = %02X%02X%02X%02X "
"data status %02X block status %02X\n",
i, ptr[0], ptr[1], ptr[2], ptr[3],
ptr[4], ptr[5]);
info->pba_to_lba[i] = UNUSABLE;
continue;
}
if ((ptr[6] >> 4) != 0x01) {
printk("sddr09: PBA %04X has invalid address field "
"%02X%02X/%02X%02X\n",
i, ptr[6], ptr[7], ptr[11], ptr[12]);
info->pba_to_lba[i] = UNUSABLE;
continue;
}
/* check even parity */
if (parity[ptr[6] ^ ptr[7]]) {
printk("sddr09: Bad parity in LBA for block %04X"
" (%02X %02X)\n", i, ptr[6], ptr[7]);
info->pba_to_lba[i] = UNUSABLE;
continue;
}
lba = short_pack(ptr[7], ptr[6]);
lba = (lba & 0x07FF) >> 1;
/*
* Every 1024 physical blocks ("zone"), the LBA numbers
* go back to zero, but are within a higher block of LBA's.
* Also, there is a maximum of 1000 LBA's per zone.
* In other words, in PBA 1024-2047 you will find LBA 0-999
* which are really LBA 1000-1999. This allows for 24 bad
* or special physical blocks per zone.
*/
if (lba >= 1000) {
unsigned long address;
printk("sddr09: Bad LBA %04X for block %04X\n",
lba, i);
info->pba_to_lba[i] = UNDEF /* UNUSABLE */;
if (erase_bad_lba_entries) {
/* some cameras cannot erase a card if it has
bad entries, so we supply this function */
address = (i << (info->pageshift + info->blockshift));
sddr09_erase(us, address>>1);
}
continue;
}
lba += 1000*(i/0x400);
if (lba<0x10 || (lba >= 0x3E0 && lba < 0x3EF))
US_DEBUGP("LBA %04X <-> PBA %04X\n", lba, i);
info->pba_to_lba[i] = lba;
info->lba_to_pba[lba] = i;
}
/*
* Approximate capacity. This is not entirely correct yet,
* since a zone with less than 1000 usable pages leads to
* missing LBAs. Especially if it is the last zone, some
* LBAs can be past capacity.
*/
lbact = 0;
for (i = 0; i < numblocks; i += 1024) {
int ct = 0;
for (j = 0; j < 1024 && i+j < numblocks; j++) {
if (info->pba_to_lba[i+j] != UNUSABLE) {
if (ct >= 1000)
info->pba_to_lba[i+j] = SPARE;
else
ct++;
}
}
lbact += ct;
}
info->lbact = lbact;
US_DEBUGP("Found %d LBA's\n", lbact);
for (i=0; i<alloc_blocks; i++)
kfree(sg_address(sg[i]));
kfree(sg);
return 0;
}
static void
sddr09_card_info_destructor(void *extra) {
struct sddr09_card_info *info = (struct sddr09_card_info *)extra;
if (!info)
return;
kfree(info->lba_to_pba);
kfree(info->pba_to_lba);
}
static void
sddr09_init_card_info(struct us_data *us) {
if (!us->extra) {
us->extra = kmalloc(sizeof(struct sddr09_card_info), GFP_NOIO);
if (us->extra) {
memset(us->extra, 0, sizeof(struct sddr09_card_info));
us->extra_destructor = sddr09_card_info_destructor;
}
}
}
/*
* This is needed at a very early stage. If this is not listed in the
* unusual devices list but called from here then LUN 0 of the combo reader
* is not recognized. But I do not know what precisely these calls do.
*/
int
sddr09_init(struct us_data *us) {
int result;
unsigned char *data = us->iobuf;
result = sddr09_send_command(us, 0x01, USB_DIR_IN, data, 2);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("sddr09_init: send_command fails\n");
return result;
}
US_DEBUGP("SDDR09init: %02X %02X\n", data[0], data[1]);
// get 07 02
result = sddr09_send_command(us, 0x08, USB_DIR_IN, data, 2);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("sddr09_init: 2nd send_command fails\n");
return result;
}
US_DEBUGP("SDDR09init: %02X %02X\n", data[0], data[1]);
// get 07 00
result = sddr09_request_sense(us, data, 18);
if (result == USB_STOR_TRANSPORT_GOOD && data[2] != 0) {
int j;
for (j=0; j<18; j++)
printk(" %02X", data[j]);
printk("\n");
// get 70 00 00 00 00 00 00 * 00 00 00 00 00 00
// 70: current command
// sense key 0, sense code 0, extd sense code 0
// additional transfer length * = sizeof(data) - 7
// Or: 70 00 06 00 00 00 00 0b 00 00 00 00 28 00 00 00 00 00
// sense key 06, sense code 28: unit attention,
// not ready to ready transition
}
// test unit ready
return USB_STOR_TRANSPORT_GOOD; /* not result */
}
/*
* Transport for the Sandisk SDDR-09
*/
int sddr09_transport(Scsi_Cmnd *srb, struct us_data *us)
{
static unsigned char sensekey = 0, sensecode = 0;
static unsigned char havefakesense = 0;
int result, i;
unsigned char *ptr;
unsigned long capacity;
unsigned int page, pages;
char string[64];
struct sddr09_card_info *info;
unsigned char inquiry_response[36] = {
0x00, 0x80, 0x00, 0x02, 0x1F, 0x00, 0x00, 0x00
};
unsigned char mode_page_01[16] = {
0x0F, 0x00, 0, 0x00,
0x01, 0x0A,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
info = (struct sddr09_card_info *)us->extra;
if (!info) {
nand_init_ecc();
sddr09_init_card_info(us);
info = (struct sddr09_card_info *)us->extra;
if (!info)
return USB_STOR_TRANSPORT_ERROR;
}
ptr = (unsigned char *)srb->request_buffer;
if (srb->cmnd[0] == REQUEST_SENSE && havefakesense) {
/* for a faked command, we have to follow with a faked sense */
memset(ptr, 0, srb->request_bufflen);
if (srb->request_bufflen > 7) {
ptr[0] = 0x70;
ptr[2] = sensekey;
ptr[7] = srb->request_bufflen - 7;
}
if (srb->request_bufflen > 12)
ptr[12] = sensecode;
sensekey = sensecode = havefakesense = 0;
return USB_STOR_TRANSPORT_GOOD;
}
havefakesense = 1;
/* Dummy up a response for INQUIRY since SDDR09 doesn't
respond to INQUIRY commands */
if (srb->cmnd[0] == INQUIRY) {
memset(inquiry_response+8, 0, 28);
fill_inquiry_response(us, inquiry_response, 36);
return USB_STOR_TRANSPORT_GOOD;
}
if (srb->cmnd[0] == READ_CAPACITY) {
struct nand_flash_dev *cardinfo;
sddr09_get_wp(us, info); /* read WP bit */
cardinfo = sddr09_get_cardinfo(us, info->flags);
if (!cardinfo) {
/* probably no media */
sensekey = 0x02; /* not ready */
sensecode = 0x3a; /* medium not present */
return USB_STOR_TRANSPORT_FAILED;
}
info->capacity = (1 << cardinfo->chipshift);
info->pageshift = cardinfo->pageshift;
info->pagesize = (1 << info->pageshift);
info->blockshift = cardinfo->blockshift;
info->blocksize = (1 << info->blockshift);
info->blockmask = info->blocksize - 1;
// map initialization, must follow get_cardinfo()
sddr09_read_map(us);
// Report capacity
capacity = (info->lbact << info->blockshift) - 1;
ptr[0] = MSB_of(capacity>>16);
ptr[1] = LSB_of(capacity>>16);
ptr[2] = MSB_of(capacity&0xFFFF);
ptr[3] = LSB_of(capacity&0xFFFF);
// Report page size
ptr[4] = MSB_of(info->pagesize>>16);
ptr[5] = LSB_of(info->pagesize>>16);
ptr[6] = MSB_of(info->pagesize&0xFFFF);
ptr[7] = LSB_of(info->pagesize&0xFFFF);
return USB_STOR_TRANSPORT_GOOD;
}
if (srb->cmnd[0] == MODE_SENSE) {
int modepage = (srb->cmnd[2] & 0x3F);
int len;
/* They ask for the Read/Write error recovery page,
or for all pages. Give as much as they have room for. */
if (modepage == 0x01 || modepage == 0x3F) {
US_DEBUGP("SDDR09: Dummy up request for "
"mode page 0x%x\n", modepage);
if (ptr == NULL)
return USB_STOR_TRANSPORT_ERROR;
len = srb->request_bufflen;
if (len > sizeof(mode_page_01))
len = sizeof(mode_page_01);
mode_page_01[0] = sizeof(mode_page_01) - 1;
mode_page_01[2] = (info->flags & SDDR09_WP) ? 0x80 : 0;
memcpy(ptr, mode_page_01, len);
return USB_STOR_TRANSPORT_GOOD;
}
return USB_STOR_TRANSPORT_ERROR;
}
if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
US_DEBUGP(
"SDDR09: %s medium removal. Not that I can do"
" anything about it...\n",
(srb->cmnd[4]&0x03) ? "Prevent" : "Allow");
return USB_STOR_TRANSPORT_GOOD;
}
havefakesense = 0;
if (srb->cmnd[0] == READ_10) {
page = short_pack(srb->cmnd[3], srb->cmnd[2]);
page <<= 16;
page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
pages = short_pack(srb->cmnd[8], srb->cmnd[7]);
US_DEBUGP("READ_10: read page %d pagect %d\n",
page, pages);
return sddr09_read_data(us, page, pages, ptr, srb->use_sg);
}
if (srb->cmnd[0] == WRITE_10) {
page = short_pack(srb->cmnd[3], srb->cmnd[2]);
page <<= 16;
page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
pages = short_pack(srb->cmnd[8], srb->cmnd[7]);
US_DEBUGP("WRITE_10: write page %d pagect %d\n",
page, pages);
return sddr09_write_data(us, page, pages, ptr, srb->use_sg);
}
// Pass TEST_UNIT_READY and REQUEST_SENSE through
if (srb->cmnd[0] != TEST_UNIT_READY &&
srb->cmnd[0] != REQUEST_SENSE) {
havefakesense = 1;
return USB_STOR_TRANSPORT_ERROR;
}
for (; srb->cmd_len<12; srb->cmd_len++)
srb->cmnd[srb->cmd_len] = 0;
srb->cmnd[1] = LUNBITS;
string[0] = 0;
for (i=0; i<12; i++)
sprintf(string+strlen(string), "%02X ", srb->cmnd[i]);
US_DEBUGP("SDDR09: Send control for command %s\n",
string);
result = sddr09_send_scsi_command(us, srb->cmnd, 12);
if (result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("sddr09_transport: sddr09_send_scsi_command "
"returns %d\n", result);
return result;
}
if (srb->request_bufflen == 0)
return USB_STOR_TRANSPORT_GOOD;
if (srb->sc_data_direction == SCSI_DATA_WRITE ||
srb->sc_data_direction == SCSI_DATA_READ) {
unsigned int pipe = (srb->sc_data_direction == SCSI_DATA_WRITE)
? us->send_bulk_pipe : us->recv_bulk_pipe;
US_DEBUGP("SDDR09: %s %d bytes\n",
(srb->sc_data_direction == SCSI_DATA_WRITE) ?
"sending" : "receiving",
srb->request_bufflen);
result = usb_stor_bulk_transfer_sg(us, pipe,
srb->request_buffer,
srb->request_bufflen,
srb->use_sg, &srb->resid);
return (result == USB_STOR_XFER_GOOD ?
USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
}
return USB_STOR_TRANSPORT_GOOD;
}
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