Logo Search packages:      
Sourcecode: linux version File versions  Download package

shuttle_usbat.c

/* Driver for SCM Microsystems (a.k.a. Shuttle) USB-ATAPI cable
 *
 * $Id: shuttle_usbat.c,v 1.17 2002/04/22 03:39:43 mdharm Exp $
 *
 * Current development and maintenance by:
 *   (c) 2000, 2001 Robert Baruch (autophile@starband.net)
 *   (c) 2004, 2005 Daniel Drake <dsd@gentoo.org>
 *
 * Developed with the assistance of:
 *   (c) 2002 Alan Stern <stern@rowland.org>
 *
 * Flash support based on earlier work by:
 *   (c) 2002 Thomas Kreiling <usbdev@sm04.de>
 *
 * Many originally ATAPI devices were slightly modified to meet the USB
 * market by using some kind of translation from ATAPI to USB on the host,
 * and the peripheral would translate from USB back to ATAPI.
 *
 * SCM Microsystems (www.scmmicro.com) makes a device, sold to OEM's only, 
 * which does the USB-to-ATAPI conversion.  By obtaining the data sheet on
 * their device under nondisclosure agreement, I have been able to write
 * this driver for Linux.
 *
 * The chip used in the device can also be used for EPP and ISA translation
 * as well. This driver is only guaranteed to work with the ATAPI
 * translation.
 *
 * See the Kconfig help text for a list of devices known to be supported by
 * this driver.
 *
 * 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 <linux/errno.h>
#include <linux/slab.h>
#include <linux/cdrom.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "shuttle_usbat.h"

#define short_pack(LSB,MSB) ( ((u16)(LSB)) | ( ((u16)(MSB))<<8 ) )
#define LSB_of(s) ((s)&0xFF)
#define MSB_of(s) ((s)>>8)

static int transferred = 0;

static int usbat_flash_transport(struct scsi_cmnd * srb, struct us_data *us);
static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us);

/*
 * Convenience function to produce an ATA read/write sectors command
 * Use cmd=0x20 for read, cmd=0x30 for write
 */
static void usbat_pack_ata_sector_cmd(unsigned char *buf,
                              unsigned char thistime,
                              u32 sector, unsigned char cmd)
{
      buf[0] = 0;
      buf[1] = thistime;
      buf[2] = sector & 0xFF;
      buf[3] = (sector >>  8) & 0xFF;
      buf[4] = (sector >> 16) & 0xFF;
      buf[5] = 0xE0 | ((sector >> 24) & 0x0F);
      buf[6] = cmd;
}

/*
 * Convenience function to get the device type (flash or hp8200)
 */
static int usbat_get_device_type(struct us_data *us)
{
      return ((struct usbat_info*)us->extra)->devicetype;
}

/*
 * Read a register from the device
 */
static int usbat_read(struct us_data *us,
                  unsigned char access,
                  unsigned char reg,
                  unsigned char *content)
{
      return usb_stor_ctrl_transfer(us,
            us->recv_ctrl_pipe,
            access | USBAT_CMD_READ_REG,
            0xC0,
            (u16)reg,
            0,
            content,
            1);
}

/*
 * Write to a register on the device
 */
static int usbat_write(struct us_data *us,
                   unsigned char access,
                   unsigned char reg,
                   unsigned char content)
{
      return usb_stor_ctrl_transfer(us,
            us->send_ctrl_pipe,
            access | USBAT_CMD_WRITE_REG,
            0x40,
            short_pack(reg, content),
            0,
            NULL,
            0);
}

/*
 * Convenience function to perform a bulk read
 */
static int usbat_bulk_read(struct us_data *us,
                     unsigned char *data,
                     unsigned int len,
                     int use_sg)
{
      if (len == 0)
            return USB_STOR_XFER_GOOD;

      US_DEBUGP("usbat_bulk_read: len = %d\n", len);
      return usb_stor_bulk_transfer_sg(us, us->recv_bulk_pipe, data, len, use_sg, NULL);
}

/*
 * Convenience function to perform a bulk write
 */
static int usbat_bulk_write(struct us_data *us,
                      unsigned char *data,
                      unsigned int len,
                      int use_sg)
{
      if (len == 0)
            return USB_STOR_XFER_GOOD;

      US_DEBUGP("usbat_bulk_write:  len = %d\n", len);
      return usb_stor_bulk_transfer_sg(us, us->send_bulk_pipe, data, len, use_sg, NULL);
}

/*
 * Some USBAT-specific commands can only be executed over a command transport
 * This transport allows one (len=8) or two (len=16) vendor-specific commands
 * to be executed.
 */
static int usbat_execute_command(struct us_data *us,
                                                 unsigned char *commands,
                                                 unsigned int len)
{
      return usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
                                                  USBAT_CMD_EXEC_CMD, 0x40, 0, 0,
                                                  commands, len);
}

/*
 * Read the status register
 */
static int usbat_get_status(struct us_data *us, unsigned char *status)
{
      int rc;
      rc = usbat_read(us, USBAT_ATA, USBAT_ATA_STATUS, status);

      US_DEBUGP("usbat_get_status: 0x%02X\n", (unsigned short) (*status));
      return rc;
}

/*
 * Check the device status
 */
static int usbat_check_status(struct us_data *us)
{
      unsigned char *reply = us->iobuf;
      int rc;

      rc = usbat_get_status(us, reply);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_FAILED;

      /* error/check condition (0x51 is ok) */
      if (*reply & 0x01 && *reply != 0x51)
            return USB_STOR_TRANSPORT_FAILED;

      /* device fault */
      if (*reply & 0x20)
            return USB_STOR_TRANSPORT_FAILED;

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Stores critical information in internal registers in prepartion for the execution
 * of a conditional usbat_read_blocks or usbat_write_blocks call.
 */
static int usbat_set_shuttle_features(struct us_data *us,
                              unsigned char external_trigger,
                              unsigned char epp_control,
                              unsigned char mask_byte,
                              unsigned char test_pattern,
                              unsigned char subcountH,
                              unsigned char subcountL)
{
      unsigned char *command = us->iobuf;

      command[0] = 0x40;
      command[1] = USBAT_CMD_SET_FEAT;

      /*
       * The only bit relevant to ATA access is bit 6
       * which defines 8 bit data access (set) or 16 bit (unset)
       */
      command[2] = epp_control;

      /*
       * If FCQ is set in the qualifier (defined in R/W cmd), then bits U0, U1,
       * ET1 and ET2 define an external event to be checked for on event of a
       * _read_blocks or _write_blocks operation. The read/write will not take
       * place unless the defined trigger signal is active.
       */
      command[3] = external_trigger;

      /*
       * The resultant byte of the mask operation (see mask_byte) is compared for
       * equivalence with this test pattern. If equal, the read/write will take
       * place.
       */
      command[4] = test_pattern;

      /*
       * This value is logically ANDed with the status register field specified
       * in the read/write command.
       */
      command[5] = mask_byte;

      /*
       * If ALQ is set in the qualifier, this field contains the address of the
       * registers where the byte count should be read for transferring the data.
       * If ALQ is not set, then this field contains the number of bytes to be
       * transferred.
       */
      command[6] = subcountL;
      command[7] = subcountH;

      return usbat_execute_command(us, command, 8);
}

/*
 * Block, waiting for an ATA device to become not busy or to report
 * an error condition.
 */
static int usbat_wait_not_busy(struct us_data *us, int minutes)
{
      int i;
      int result;
      unsigned char *status = us->iobuf;

      /* Synchronizing cache on a CDR could take a heck of a long time,
       * but probably not more than 10 minutes or so. On the other hand,
       * doing a full blank on a CDRW at speed 1 will take about 75
       * minutes!
       */

      for (i=0; i<1200+minutes*60; i++) {

            result = usbat_get_status(us, status);

            if (result!=USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;
            if (*status & 0x01) { /* check condition */
                  result = usbat_read(us, USBAT_ATA, 0x10, status);
                  return USB_STOR_TRANSPORT_FAILED;
            }
            if (*status & 0x20) /* device fault */
                  return USB_STOR_TRANSPORT_FAILED;

            if ((*status & 0x80)==0x00) { /* not busy */
                  US_DEBUGP("Waited not busy for %d steps\n", i);
                  return USB_STOR_TRANSPORT_GOOD;
            }

            if (i<500)
                  msleep(10); /* 5 seconds */
            else if (i<700)
                  msleep(50); /* 10 seconds */
            else if (i<1200)
                  msleep(100); /* 50 seconds */
            else
                  msleep(1000); /* X minutes */
      }

      US_DEBUGP("Waited not busy for %d minutes, timing out.\n",
            minutes);
      return USB_STOR_TRANSPORT_FAILED;
}

/*
 * Read block data from the data register
 */
static int usbat_read_block(struct us_data *us,
                      unsigned char *content,
                      unsigned short len,
                      int use_sg)
{
      int result;
      unsigned char *command = us->iobuf;

      if (!len)
            return USB_STOR_TRANSPORT_GOOD;

      command[0] = 0xC0;
      command[1] = USBAT_ATA | USBAT_CMD_READ_BLOCK;
      command[2] = USBAT_ATA_DATA;
      command[3] = 0;
      command[4] = 0;
      command[5] = 0;
      command[6] = LSB_of(len);
      command[7] = MSB_of(len);

      result = usbat_execute_command(us, command, 8);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      result = usbat_bulk_read(us, content, len, use_sg);
      return (result == USB_STOR_XFER_GOOD ?
                  USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
}

/*
 * Write block data via the data register
 */
static int usbat_write_block(struct us_data *us,
                       unsigned char access,
                       unsigned char *content,
                       unsigned short len,
                       int minutes,
                       int use_sg)
{
      int result;
      unsigned char *command = us->iobuf;

      if (!len)
            return USB_STOR_TRANSPORT_GOOD;

      command[0] = 0x40;
      command[1] = access | USBAT_CMD_WRITE_BLOCK;
      command[2] = USBAT_ATA_DATA;
      command[3] = 0;
      command[4] = 0;
      command[5] = 0;
      command[6] = LSB_of(len);
      command[7] = MSB_of(len);

      result = usbat_execute_command(us, command, 8);

      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      result = usbat_bulk_write(us, content, len, use_sg);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      return usbat_wait_not_busy(us, minutes);
}

/*
 * Process read and write requests
 */
static int usbat_hp8200e_rw_block_test(struct us_data *us,
                               unsigned char access,
                               unsigned char *registers,
                               unsigned char *data_out,
                               unsigned short num_registers,
                               unsigned char data_reg,
                               unsigned char status_reg,
                               unsigned char timeout,
                               unsigned char qualifier,
                               int direction,
                               unsigned char *content,
                               unsigned short len,
                               int use_sg,
                               int minutes)
{
      int result;
      unsigned int pipe = (direction == DMA_FROM_DEVICE) ?
                  us->recv_bulk_pipe : us->send_bulk_pipe;

      unsigned char *command = us->iobuf;
      int i, j;
      int cmdlen;
      unsigned char *data = us->iobuf;
      unsigned char *status = us->iobuf;

      BUG_ON(num_registers > US_IOBUF_SIZE/2);

      for (i=0; i<20; i++) {

            /*
             * The first time we send the full command, which consists
             * of downloading the SCSI command followed by downloading
             * the data via a write-and-test.  Any other time we only
             * send the command to download the data -- the SCSI command
             * is still 'active' in some sense in the device.
             * 
             * We're only going to try sending the data 10 times. After
             * that, we just return a failure.
             */

            if (i==0) {
                  cmdlen = 16;
                  /*
                   * Write to multiple registers
                   * Not really sure the 0x07, 0x17, 0xfc, 0xe7 is
                   * necessary here, but that's what came out of the
                   * trace every single time.
                   */
                  command[0] = 0x40;
                  command[1] = access | USBAT_CMD_WRITE_REGS;
                  command[2] = 0x07;
                  command[3] = 0x17;
                  command[4] = 0xFC;
                  command[5] = 0xE7;
                  command[6] = LSB_of(num_registers*2);
                  command[7] = MSB_of(num_registers*2);
            } else
                  cmdlen = 8;

            /* Conditionally read or write blocks */
            command[cmdlen-8] = (direction==DMA_TO_DEVICE ? 0x40 : 0xC0);
            command[cmdlen-7] = access |
                        (direction==DMA_TO_DEVICE ?
                         USBAT_CMD_COND_WRITE_BLOCK : USBAT_CMD_COND_READ_BLOCK);
            command[cmdlen-6] = data_reg;
            command[cmdlen-5] = status_reg;
            command[cmdlen-4] = timeout;
            command[cmdlen-3] = qualifier;
            command[cmdlen-2] = LSB_of(len);
            command[cmdlen-1] = MSB_of(len);

            result = usbat_execute_command(us, command, cmdlen);

            if (result != USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (i==0) {

                  for (j=0; j<num_registers; j++) {
                        data[j<<1] = registers[j];
                        data[1+(j<<1)] = data_out[j];
                  }

                  result = usbat_bulk_write(us, data, num_registers*2, 0);
                  if (result != USB_STOR_XFER_GOOD)
                        return USB_STOR_TRANSPORT_ERROR;

            }

            result = usb_stor_bulk_transfer_sg(us,
                  pipe, content, len, use_sg, NULL);

            /*
             * If we get a stall on the bulk download, we'll retry
             * the bulk download -- but not the SCSI command because
             * in some sense the SCSI command is still 'active' and
             * waiting for the data. Don't ask me why this should be;
             * I'm only following what the Windoze driver did.
             *
             * Note that a stall for the test-and-read/write command means
             * that the test failed. In this case we're testing to make
             * sure that the device is error-free
             * (i.e. bit 0 -- CHK -- of status is 0). The most likely
             * hypothesis is that the USBAT chip somehow knows what
             * the device will accept, but doesn't give the device any
             * data until all data is received. Thus, the device would
             * still be waiting for the first byte of data if a stall
             * occurs, even if the stall implies that some data was
             * transferred.
             */

            if (result == USB_STOR_XFER_SHORT ||
                        result == USB_STOR_XFER_STALLED) {

                  /*
                   * If we're reading and we stalled, then clear
                   * the bulk output pipe only the first time.
                   */

                  if (direction==DMA_FROM_DEVICE && i==0) {
                        if (usb_stor_clear_halt(us,
                                    us->send_bulk_pipe) < 0)
                              return USB_STOR_TRANSPORT_ERROR;
                  }

                  /*
                   * Read status: is the device angry, or just busy?
                   */

                  result = usbat_read(us, USBAT_ATA, 
                        direction==DMA_TO_DEVICE ?
                              USBAT_ATA_STATUS : USBAT_ATA_ALTSTATUS,
                        status);

                  if (result!=USB_STOR_XFER_GOOD)
                        return USB_STOR_TRANSPORT_ERROR;
                  if (*status & 0x01) /* check condition */
                        return USB_STOR_TRANSPORT_FAILED;
                  if (*status & 0x20) /* device fault */
                        return USB_STOR_TRANSPORT_FAILED;

                  US_DEBUGP("Redoing %s\n",
                    direction==DMA_TO_DEVICE ? "write" : "read");

            } else if (result != USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;
            else
                  return usbat_wait_not_busy(us, minutes);

      }

      US_DEBUGP("Bummer! %s bulk data 20 times failed.\n",
            direction==DMA_TO_DEVICE ? "Writing" : "Reading");

      return USB_STOR_TRANSPORT_FAILED;
}

/*
 * Write to multiple registers:
 * Allows us to write specific data to any registers. The data to be written
 * gets packed in this sequence: reg0, data0, reg1, data1, ..., regN, dataN
 * which gets sent through bulk out.
 * Not designed for large transfers of data!
 */
static int usbat_multiple_write(struct us_data *us,
                        unsigned char *registers,
                        unsigned char *data_out,
                        unsigned short num_registers)
{
      int i, result;
      unsigned char *data = us->iobuf;
      unsigned char *command = us->iobuf;

      BUG_ON(num_registers > US_IOBUF_SIZE/2);

      /* Write to multiple registers, ATA access */
      command[0] = 0x40;
      command[1] = USBAT_ATA | USBAT_CMD_WRITE_REGS;

      /* No relevance */
      command[2] = 0;
      command[3] = 0;
      command[4] = 0;
      command[5] = 0;

      /* Number of bytes to be transferred (incl. addresses and data) */
      command[6] = LSB_of(num_registers*2);
      command[7] = MSB_of(num_registers*2);

      /* The setup command */
      result = usbat_execute_command(us, command, 8);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      /* Create the reg/data, reg/data sequence */
      for (i=0; i<num_registers; i++) {
            data[i<<1] = registers[i];
            data[1+(i<<1)] = data_out[i];
      }

      /* Send the data */
      result = usbat_bulk_write(us, data, num_registers*2, 0);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      if (usbat_get_device_type(us) == USBAT_DEV_HP8200)
            return usbat_wait_not_busy(us, 0);
      else
            return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Conditionally read blocks from device:
 * Allows us to read blocks from a specific data register, based upon the
 * condition that a status register can be successfully masked with a status
 * qualifier. If this condition is not initially met, the read will wait
 * up until a maximum amount of time has elapsed, as specified by timeout.
 * The read will start when the condition is met, otherwise the command aborts.
 *
 * The qualifier defined here is not the value that is masked, it defines
 * conditions for the write to take place. The actual masked qualifier (and
 * other related details) are defined beforehand with _set_shuttle_features().
 */
static int usbat_read_blocks(struct us_data *us,
                       unsigned char *buffer,
                       int len,
                       int use_sg)
{
      int result;
      unsigned char *command = us->iobuf;

      command[0] = 0xC0;
      command[1] = USBAT_ATA | USBAT_CMD_COND_READ_BLOCK;
      command[2] = USBAT_ATA_DATA;
      command[3] = USBAT_ATA_STATUS;
      command[4] = 0xFD; /* Timeout (ms); */
      command[5] = USBAT_QUAL_FCQ;
      command[6] = LSB_of(len);
      command[7] = MSB_of(len);

      /* Multiple block read setup command */
      result = usbat_execute_command(us, command, 8);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_FAILED;
      
      /* Read the blocks we just asked for */
      result = usbat_bulk_read(us, buffer, len, use_sg);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_FAILED;

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Conditionally write blocks to device:
 * Allows us to write blocks to a specific data register, based upon the
 * condition that a status register can be successfully masked with a status
 * qualifier. If this condition is not initially met, the write will wait
 * up until a maximum amount of time has elapsed, as specified by timeout.
 * The read will start when the condition is met, otherwise the command aborts.
 *
 * The qualifier defined here is not the value that is masked, it defines
 * conditions for the write to take place. The actual masked qualifier (and
 * other related details) are defined beforehand with _set_shuttle_features().
 */
static int usbat_write_blocks(struct us_data *us,
                                            unsigned char *buffer,
                        int len,
                        int use_sg)
{
      int result;
      unsigned char *command = us->iobuf;

      command[0] = 0x40;
      command[1] = USBAT_ATA | USBAT_CMD_COND_WRITE_BLOCK;
      command[2] = USBAT_ATA_DATA;
      command[3] = USBAT_ATA_STATUS;
      command[4] = 0xFD; /* Timeout (ms) */
      command[5] = USBAT_QUAL_FCQ;
      command[6] = LSB_of(len);
      command[7] = MSB_of(len);

      /* Multiple block write setup command */
      result = usbat_execute_command(us, command, 8);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_FAILED;
      
      /* Write the data */
      result = usbat_bulk_write(us, buffer, len, use_sg);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_FAILED;

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Read the User IO register
 */
static int usbat_read_user_io(struct us_data *us, unsigned char *data_flags)
{
      int result;

      result = usb_stor_ctrl_transfer(us,
            us->recv_ctrl_pipe,
            USBAT_CMD_UIO,
            0xC0,
            0,
            0,
            data_flags,
            USBAT_UIO_READ);

      US_DEBUGP("usbat_read_user_io: UIO register reads %02X\n", (unsigned short) (*data_flags));

      return result;
}

/*
 * Write to the User IO register
 */
static int usbat_write_user_io(struct us_data *us,
                         unsigned char enable_flags,
                         unsigned char data_flags)
{
      return usb_stor_ctrl_transfer(us,
            us->send_ctrl_pipe,
            USBAT_CMD_UIO,
            0x40,
            short_pack(enable_flags, data_flags),
            0,
            NULL,
            USBAT_UIO_WRITE);
}

/*
 * Reset the device
 * Often needed on media change.
 */
static int usbat_device_reset(struct us_data *us)
{
      int rc;

      /*
       * Reset peripheral, enable peripheral control signals
       * (bring reset signal up)
       */
      rc = usbat_write_user_io(us,
                                           USBAT_UIO_DRVRST | USBAT_UIO_OE1 | USBAT_UIO_OE0,
                                           USBAT_UIO_EPAD | USBAT_UIO_1);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;
                  
      /*
       * Enable peripheral control signals
       * (bring reset signal down)
       */
      rc = usbat_write_user_io(us,
                                           USBAT_UIO_OE1  | USBAT_UIO_OE0,
                                           USBAT_UIO_EPAD | USBAT_UIO_1);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Enable card detect
 */
static int usbat_device_enable_cdt(struct us_data *us)
{
      int rc;

      /* Enable peripheral control signals and card detect */
      rc = usbat_write_user_io(us,
                                           USBAT_UIO_ACKD | USBAT_UIO_OE1  | USBAT_UIO_OE0,
                                           USBAT_UIO_EPAD | USBAT_UIO_1);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Determine if media is present.
 */
static int usbat_flash_check_media_present(unsigned char *uio)
{
      if (*uio & USBAT_UIO_UI0) {
            US_DEBUGP("usbat_flash_check_media_present: no media detected\n");
            return USBAT_FLASH_MEDIA_NONE;
      }

      return USBAT_FLASH_MEDIA_CF;
}

/*
 * Determine if media has changed since last operation
 */
static int usbat_flash_check_media_changed(unsigned char *uio)
{
      if (*uio & USBAT_UIO_0) {
            US_DEBUGP("usbat_flash_check_media_changed: media change detected\n");
            return USBAT_FLASH_MEDIA_CHANGED;
      }

      return USBAT_FLASH_MEDIA_SAME;
}

/*
 * Check for media change / no media and handle the situation appropriately
 */
static int usbat_flash_check_media(struct us_data *us,
                           struct usbat_info *info)
{
      int rc;
      unsigned char *uio = us->iobuf;

      rc = usbat_read_user_io(us, uio);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      /* Check for media existence */
      rc = usbat_flash_check_media_present(uio);
      if (rc == USBAT_FLASH_MEDIA_NONE) {
            info->sense_key = 0x02;
            info->sense_asc = 0x3A;
            info->sense_ascq = 0x00;
            return USB_STOR_TRANSPORT_FAILED;
      }

      /* Check for media change */
      rc = usbat_flash_check_media_changed(uio);
      if (rc == USBAT_FLASH_MEDIA_CHANGED) {

            /* Reset and re-enable card detect */
            rc = usbat_device_reset(us);
            if (rc != USB_STOR_TRANSPORT_GOOD)
                  return rc;
            rc = usbat_device_enable_cdt(us);
            if (rc != USB_STOR_TRANSPORT_GOOD)
                  return rc;

            msleep(50);

            rc = usbat_read_user_io(us, uio);
            if (rc != USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;
            
            info->sense_key = UNIT_ATTENTION;
            info->sense_asc = 0x28;
            info->sense_ascq = 0x00;
            return USB_STOR_TRANSPORT_FAILED;
      }

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Determine whether we are controlling a flash-based reader/writer,
 * or a HP8200-based CD drive.
 * Sets transport functions as appropriate.
 */
static int usbat_identify_device(struct us_data *us,
                         struct usbat_info *info)
{
      int rc;
      unsigned char status;

      if (!us || !info)
            return USB_STOR_TRANSPORT_ERROR;

      rc = usbat_device_reset(us);
      if (rc != USB_STOR_TRANSPORT_GOOD)
            return rc;
      msleep(500);

      /*
       * In attempt to distinguish between HP CDRW's and Flash readers, we now
       * execute the IDENTIFY PACKET DEVICE command. On ATA devices (i.e. flash
       * readers), this command should fail with error. On ATAPI devices (i.e.
       * CDROM drives), it should succeed.
       */
      rc = usbat_write(us, USBAT_ATA, USBAT_ATA_CMD, 0xA1);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      rc = usbat_get_status(us, &status);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      /* Check for error bit, or if the command 'fell through' */
      if (status == 0xA1 || !(status & 0x01)) {
            /* Device is HP 8200 */
            US_DEBUGP("usbat_identify_device: Detected HP8200 CDRW\n");
            info->devicetype = USBAT_DEV_HP8200;
      } else {
            /* Device is a CompactFlash reader/writer */
            US_DEBUGP("usbat_identify_device: Detected Flash reader/writer\n");
            info->devicetype = USBAT_DEV_FLASH;
      }

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Set the transport function based on the device type
 */
static int usbat_set_transport(struct us_data *us,
                         struct usbat_info *info,
                         int devicetype)
{

      if (!info->devicetype)
            info->devicetype = devicetype;

      if (!info->devicetype)
            usbat_identify_device(us, info);

      switch (info->devicetype) {
      default:
            return USB_STOR_TRANSPORT_ERROR;

      case  USBAT_DEV_HP8200:
            us->transport = usbat_hp8200e_transport;
            break;

      case USBAT_DEV_FLASH:
            us->transport = usbat_flash_transport;
            break;
      }

      return 0;
}

/*
 * Read the media capacity
 */
static int usbat_flash_get_sector_count(struct us_data *us,
                              struct usbat_info *info)
{
      unsigned char registers[3] = {
            USBAT_ATA_SECCNT,
            USBAT_ATA_DEVICE,
            USBAT_ATA_CMD,
      };
      unsigned char  command[3] = { 0x01, 0xA0, 0xEC };
      unsigned char *reply;
      unsigned char status;
      int rc;

      if (!us || !info)
            return USB_STOR_TRANSPORT_ERROR;

      reply = kmalloc(512, GFP_NOIO);
      if (!reply)
            return USB_STOR_TRANSPORT_ERROR;

      /* ATA command : IDENTIFY DEVICE */
      rc = usbat_multiple_write(us, registers, command, 3);
      if (rc != USB_STOR_XFER_GOOD) {
            US_DEBUGP("usbat_flash_get_sector_count: Gah! identify_device failed\n");
            rc = USB_STOR_TRANSPORT_ERROR;
            goto leave;
      }

      /* Read device status */
      if (usbat_get_status(us, &status) != USB_STOR_XFER_GOOD) {
            rc = USB_STOR_TRANSPORT_ERROR;
            goto leave;
      }

      msleep(100);

      /* Read the device identification data */
      rc = usbat_read_block(us, reply, 512, 0);
      if (rc != USB_STOR_TRANSPORT_GOOD)
            goto leave;

      info->sectors = ((u32)(reply[117]) << 24) |
            ((u32)(reply[116]) << 16) |
            ((u32)(reply[115]) <<  8) |
            ((u32)(reply[114])      );

      rc = USB_STOR_TRANSPORT_GOOD;

 leave:
      kfree(reply);
      return rc;
}

/*
 * Read data from device
 */
static int usbat_flash_read_data(struct us_data *us,
                                                 struct usbat_info *info,
                                                 u32 sector,
                                                 u32 sectors)
{
      unsigned char registers[7] = {
            USBAT_ATA_FEATURES,
            USBAT_ATA_SECCNT,
            USBAT_ATA_SECNUM,
            USBAT_ATA_LBA_ME,
            USBAT_ATA_LBA_HI,
            USBAT_ATA_DEVICE,
            USBAT_ATA_STATUS,
      };
      unsigned char command[7];
      unsigned char *buffer;
      unsigned char  thistime;
      unsigned int totallen, alloclen;
      int len, result;
      unsigned int sg_offset = 0;
      struct scatterlist *sg = NULL;

      result = usbat_flash_check_media(us, info);
      if (result != USB_STOR_TRANSPORT_GOOD)
            return result;

      /*
       * we're working in LBA mode.  according to the ATA spec,
       * we can support up to 28-bit addressing.  I don't know if Jumpshot
       * supports beyond 24-bit addressing.  It's kind of hard to test
       * since it requires > 8GB CF card.
       */

      if (sector > 0x0FFFFFFF)
            return USB_STOR_TRANSPORT_ERROR;

      totallen = sectors * info->ssize;

      /*
       * Since we don't read more than 64 KB at a time, we have to create
       * a bounce buffer and move the data a piece at a time between the
       * bounce buffer and the actual transfer buffer.
       */

      alloclen = min(totallen, 65536u);
      buffer = kmalloc(alloclen, GFP_NOIO);
      if (buffer == NULL)
            return USB_STOR_TRANSPORT_ERROR;

      do {
            /*
             * loop, never allocate or transfer more than 64k at once
             * (min(128k, 255*info->ssize) is the real limit)
             */
            len = min(totallen, alloclen);
            thistime = (len / info->ssize) & 0xff;
 
            /* ATA command 0x20 (READ SECTORS) */
            usbat_pack_ata_sector_cmd(command, thistime, sector, 0x20);

            /* Write/execute ATA read command */
            result = usbat_multiple_write(us, registers, command, 7);
            if (result != USB_STOR_TRANSPORT_GOOD)
                  goto leave;

            /* Read the data we just requested */
            result = usbat_read_blocks(us, buffer, len, 0);
            if (result != USB_STOR_TRANSPORT_GOOD)
                  goto leave;
       
            US_DEBUGP("usbat_flash_read_data:  %d bytes\n", len);
      
            /* Store the data in the transfer buffer */
            usb_stor_access_xfer_buf(buffer, len, us->srb,
                               &sg, &sg_offset, TO_XFER_BUF);

            sector += thistime;
            totallen -= len;
      } while (totallen > 0);

      kfree(buffer);
      return USB_STOR_TRANSPORT_GOOD;

leave:
      kfree(buffer);
      return USB_STOR_TRANSPORT_ERROR;
}

/*
 * Write data to device
 */
static int usbat_flash_write_data(struct us_data *us,
                                                  struct usbat_info *info,
                                                  u32 sector,
                                                  u32 sectors)
{
      unsigned char registers[7] = {
            USBAT_ATA_FEATURES,
            USBAT_ATA_SECCNT,
            USBAT_ATA_SECNUM,
            USBAT_ATA_LBA_ME,
            USBAT_ATA_LBA_HI,
            USBAT_ATA_DEVICE,
            USBAT_ATA_STATUS,
      };
      unsigned char command[7];
      unsigned char *buffer;
      unsigned char  thistime;
      unsigned int totallen, alloclen;
      int len, result;
      unsigned int sg_offset = 0;
      struct scatterlist *sg = NULL;

      result = usbat_flash_check_media(us, info);
      if (result != USB_STOR_TRANSPORT_GOOD)
            return result;

      /*
       * we're working in LBA mode.  according to the ATA spec,
       * we can support up to 28-bit addressing.  I don't know if the device
       * supports beyond 24-bit addressing.  It's kind of hard to test
       * since it requires > 8GB media.
       */

      if (sector > 0x0FFFFFFF)
            return USB_STOR_TRANSPORT_ERROR;

      totallen = sectors * info->ssize;

      /*
       * Since we don't write more than 64 KB at a time, we have to create
       * a bounce buffer and move the data a piece at a time between the
       * bounce buffer and the actual transfer buffer.
       */

      alloclen = min(totallen, 65536u);
      buffer = kmalloc(alloclen, GFP_NOIO);
      if (buffer == NULL)
            return USB_STOR_TRANSPORT_ERROR;

      do {
            /*
             * loop, never allocate or transfer more than 64k at once
             * (min(128k, 255*info->ssize) is the real limit)
             */
            len = min(totallen, alloclen);
            thistime = (len / info->ssize) & 0xff;

            /* Get the data from the transfer buffer */
            usb_stor_access_xfer_buf(buffer, len, us->srb,
                               &sg, &sg_offset, FROM_XFER_BUF);

            /* ATA command 0x30 (WRITE SECTORS) */
            usbat_pack_ata_sector_cmd(command, thistime, sector, 0x30);

            /* Write/execute ATA write command */
            result = usbat_multiple_write(us, registers, command, 7);
            if (result != USB_STOR_TRANSPORT_GOOD)
                  goto leave;

            /* Write the data */
            result = usbat_write_blocks(us, buffer, len, 0);
            if (result != USB_STOR_TRANSPORT_GOOD)
                  goto leave;

            sector += thistime;
            totallen -= len;
      } while (totallen > 0);

      kfree(buffer);
      return result;

leave:
      kfree(buffer);
      return USB_STOR_TRANSPORT_ERROR;
}

/*
 * Squeeze a potentially huge (> 65535 byte) read10 command into
 * a little ( <= 65535 byte) ATAPI pipe
 */
static int usbat_hp8200e_handle_read10(struct us_data *us,
                               unsigned char *registers,
                               unsigned char *data,
                               struct scsi_cmnd *srb)
{
      int result = USB_STOR_TRANSPORT_GOOD;
      unsigned char *buffer;
      unsigned int len;
      unsigned int sector;
      unsigned int sg_offset = 0;
      struct scatterlist *sg = NULL;

      US_DEBUGP("handle_read10: transfersize %d\n",
            srb->transfersize);

      if (srb->request_bufflen < 0x10000) {

            result = usbat_hp8200e_rw_block_test(us, USBAT_ATA, 
                  registers, data, 19,
                  USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
                  (USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
                  DMA_FROM_DEVICE,
                  srb->request_buffer, 
                  srb->request_bufflen, srb->use_sg, 1);

            return result;
      }

      /*
       * Since we're requesting more data than we can handle in
       * a single read command (max is 64k-1), we will perform
       * multiple reads, but each read must be in multiples of
       * a sector.  Luckily the sector size is in srb->transfersize
       * (see linux/drivers/scsi/sr.c).
       */

      if (data[7+0] == GPCMD_READ_CD) {
            len = short_pack(data[7+9], data[7+8]);
            len <<= 16;
            len |= data[7+7];
            US_DEBUGP("handle_read10: GPCMD_READ_CD: len %d\n", len);
            srb->transfersize = srb->request_bufflen/len;
      }

      if (!srb->transfersize)  {
            srb->transfersize = 2048; /* A guess */
            US_DEBUGP("handle_read10: transfersize 0, forcing %d\n",
                  srb->transfersize);
      }

      /*
       * Since we only read in one block at a time, we have to create
       * a bounce buffer and move the data a piece at a time between the
       * bounce buffer and the actual transfer buffer.
       */

      len = (65535/srb->transfersize) * srb->transfersize;
      US_DEBUGP("Max read is %d bytes\n", len);
      len = min(len, srb->request_bufflen);
      buffer = kmalloc(len, GFP_NOIO);
      if (buffer == NULL) /* bloody hell! */
            return USB_STOR_TRANSPORT_FAILED;
      sector = short_pack(data[7+3], data[7+2]);
      sector <<= 16;
      sector |= short_pack(data[7+5], data[7+4]);
      transferred = 0;

      while (transferred != srb->request_bufflen) {

            if (len > srb->request_bufflen - transferred)
                  len = srb->request_bufflen - transferred;

            data[3] = len&0xFF;       /* (cylL) = expected length (L) */
            data[4] = (len>>8)&0xFF;  /* (cylH) = expected length (H) */

            /* Fix up the SCSI command sector and num sectors */

            data[7+2] = MSB_of(sector>>16); /* SCSI command sector */
            data[7+3] = LSB_of(sector>>16);
            data[7+4] = MSB_of(sector&0xFFFF);
            data[7+5] = LSB_of(sector&0xFFFF);
            if (data[7+0] == GPCMD_READ_CD)
                  data[7+6] = 0;
            data[7+7] = MSB_of(len / srb->transfersize); /* SCSI command */
            data[7+8] = LSB_of(len / srb->transfersize); /* num sectors */

            result = usbat_hp8200e_rw_block_test(us, USBAT_ATA, 
                  registers, data, 19,
                  USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD, 
                  (USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
                  DMA_FROM_DEVICE,
                  buffer,
                  len, 0, 1);

            if (result != USB_STOR_TRANSPORT_GOOD)
                  break;

            /* Store the data in the transfer buffer */
            usb_stor_access_xfer_buf(buffer, len, srb,
                         &sg, &sg_offset, TO_XFER_BUF);

            /* Update the amount transferred and the sector number */

            transferred += len;
            sector += len / srb->transfersize;

      } /* while transferred != srb->request_bufflen */

      kfree(buffer);
      return result;
}

static int usbat_select_and_test_registers(struct us_data *us)
{
      int selector;
      unsigned char *status = us->iobuf;

      /* try device = master, then device = slave. */
      for (selector = 0xA0; selector <= 0xB0; selector += 0x10) {
            if (usbat_write(us, USBAT_ATA, USBAT_ATA_DEVICE, selector) !=
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_read(us, USBAT_ATA, USBAT_ATA_STATUS, status) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_read(us, USBAT_ATA, USBAT_ATA_DEVICE, status) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_HI, status) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_write(us, USBAT_ATA, USBAT_ATA_LBA_ME, 0x55) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_write(us, USBAT_ATA, USBAT_ATA_LBA_HI, 0xAA) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;

            if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
                        USB_STOR_XFER_GOOD)
                  return USB_STOR_TRANSPORT_ERROR;
      }

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Initialize the USBAT processor and the storage device
 */
static int init_usbat(struct us_data *us, int devicetype)
{
      int rc;
      struct usbat_info *info;
      unsigned char subcountH = USBAT_ATA_LBA_HI;
      unsigned char subcountL = USBAT_ATA_LBA_ME;
      unsigned char *status = us->iobuf;

      us->extra = kzalloc(sizeof(struct usbat_info), GFP_NOIO);
      if (!us->extra) {
            US_DEBUGP("init_usbat: Gah! Can't allocate storage for usbat info struct!\n");
            return 1;
      }
      info = (struct usbat_info *) (us->extra);

      /* Enable peripheral control signals */
      rc = usbat_write_user_io(us,
                         USBAT_UIO_OE1 | USBAT_UIO_OE0,
                         USBAT_UIO_EPAD | USBAT_UIO_1);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      US_DEBUGP("INIT 1\n");

      msleep(2000);

      rc = usbat_read_user_io(us, status);
      if (rc != USB_STOR_TRANSPORT_GOOD)
            return rc;

      US_DEBUGP("INIT 2\n");

      rc = usbat_read_user_io(us, status);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      rc = usbat_read_user_io(us, status);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      US_DEBUGP("INIT 3\n");

      rc = usbat_select_and_test_registers(us);
      if (rc != USB_STOR_TRANSPORT_GOOD)
            return rc;

      US_DEBUGP("INIT 4\n");

      rc = usbat_read_user_io(us, status);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      US_DEBUGP("INIT 5\n");

      /* Enable peripheral control signals and card detect */
      rc = usbat_device_enable_cdt(us);
      if (rc != USB_STOR_TRANSPORT_GOOD)
            return rc;

      US_DEBUGP("INIT 6\n");

      rc = usbat_read_user_io(us, status);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      US_DEBUGP("INIT 7\n");

      msleep(1400);

      rc = usbat_read_user_io(us, status);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      US_DEBUGP("INIT 8\n");

      rc = usbat_select_and_test_registers(us);
      if (rc != USB_STOR_TRANSPORT_GOOD)
            return rc;

      US_DEBUGP("INIT 9\n");

      /* At this point, we need to detect which device we are using */
      if (usbat_set_transport(us, info, devicetype))
            return USB_STOR_TRANSPORT_ERROR;

      US_DEBUGP("INIT 10\n");

      if (usbat_get_device_type(us) == USBAT_DEV_FLASH) { 
            subcountH = 0x02;
            subcountL = 0x00;
      }
      rc = usbat_set_shuttle_features(us, (USBAT_FEAT_ETEN | USBAT_FEAT_ET2 | USBAT_FEAT_ET1),
                                                      0x00, 0x88, 0x08, subcountH, subcountL);
      if (rc != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;

      US_DEBUGP("INIT 11\n");

      return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Transport for the HP 8200e
 */
static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us)
{
      int result;
      unsigned char *status = us->iobuf;
      unsigned char registers[32];
      unsigned char data[32];
      unsigned int len;
      int i;
      char string[64];

      len = srb->request_bufflen;

      /* Send A0 (ATA PACKET COMMAND).
         Note: I guess we're never going to get any of the ATA
         commands... just ATA Packet Commands.
       */

      registers[0] = USBAT_ATA_FEATURES;
      registers[1] = USBAT_ATA_SECCNT;
      registers[2] = USBAT_ATA_SECNUM;
      registers[3] = USBAT_ATA_LBA_ME;
      registers[4] = USBAT_ATA_LBA_HI;
      registers[5] = USBAT_ATA_DEVICE;
      registers[6] = USBAT_ATA_CMD;
      data[0] = 0x00;
      data[1] = 0x00;
      data[2] = 0x00;
      data[3] = len&0xFF;           /* (cylL) = expected length (L) */
      data[4] = (len>>8)&0xFF;      /* (cylH) = expected length (H) */
      data[5] = 0xB0;         /* (device sel) = slave */
      data[6] = 0xA0;         /* (command) = ATA PACKET COMMAND */

      for (i=7; i<19; i++) {
            registers[i] = 0x10;
            data[i] = (i-7 >= srb->cmd_len) ? 0 : srb->cmnd[i-7];
      }

      result = usbat_get_status(us, status);
      US_DEBUGP("Status = %02X\n", *status);
      if (result != USB_STOR_XFER_GOOD)
            return USB_STOR_TRANSPORT_ERROR;
      if (srb->cmnd[0] == TEST_UNIT_READY)
            transferred = 0;

      if (srb->sc_data_direction == DMA_TO_DEVICE) {

            result = usbat_hp8200e_rw_block_test(us, USBAT_ATA, 
                  registers, data, 19,
                  USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
                  (USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
                  DMA_TO_DEVICE,
                  srb->request_buffer, 
                  len, srb->use_sg, 10);

            if (result == USB_STOR_TRANSPORT_GOOD) {
                  transferred += len;
                  US_DEBUGP("Wrote %08X bytes\n", transferred);
            }

            return result;

      } else if (srb->cmnd[0] == READ_10 ||
               srb->cmnd[0] == GPCMD_READ_CD) {

            return usbat_hp8200e_handle_read10(us, registers, data, srb);

      }

      if (len > 0xFFFF) {
            US_DEBUGP("Error: len = %08X... what do I do now?\n",
                  len);
            return USB_STOR_TRANSPORT_ERROR;
      }

      if ( (result = usbat_multiple_write(us, 
                  registers, data, 7)) != USB_STOR_TRANSPORT_GOOD) {
            return result;
      }

      /*
       * Write the 12-byte command header.
       *
       * If the command is BLANK then set the timer for 75 minutes.
       * Otherwise set it for 10 minutes.
       *
       * NOTE: THE 8200 DOCUMENTATION STATES THAT BLANKING A CDRW
       * AT SPEED 4 IS UNRELIABLE!!!
       */

      if ((result = usbat_write_block(us,
                  USBAT_ATA, srb->cmnd, 12,
                        (srb->cmnd[0]==GPCMD_BLANK ? 75 : 10), 0) !=
                       USB_STOR_TRANSPORT_GOOD)) {
            return result;
      }

      /* If there is response data to be read in then do it here. */

      if (len != 0 && (srb->sc_data_direction == DMA_FROM_DEVICE)) {

            /* How many bytes to read in? Check cylL register */

            if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) != 
                  USB_STOR_XFER_GOOD) {
                  return USB_STOR_TRANSPORT_ERROR;
            }

            if (len > 0xFF) { /* need to read cylH also */
                  len = *status;
                  if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_HI, status) !=
                            USB_STOR_XFER_GOOD) {
                        return USB_STOR_TRANSPORT_ERROR;
                  }
                  len += ((unsigned int) *status)<<8;
            }
            else
                  len = *status;


            result = usbat_read_block(us, srb->request_buffer, len, srb->use_sg);

            /* Debug-print the first 32 bytes of the transfer */

            if (!srb->use_sg) {
                  string[0] = 0;
                  for (i=0; i<len && i<32; i++) {
                        sprintf(string+strlen(string), "%02X ",
                          ((unsigned char *)srb->request_buffer)[i]);
                        if ((i%16)==15) {
                              US_DEBUGP("%s\n", string);
                              string[0] = 0;
                        }
                  }
                  if (string[0]!=0)
                        US_DEBUGP("%s\n", string);
            }
      }

      return result;
}

/*
 * Transport for USBAT02-based CompactFlash and similar storage devices
 */
static int usbat_flash_transport(struct scsi_cmnd * srb, struct us_data *us)
{
      int rc;
      struct usbat_info *info = (struct usbat_info *) (us->extra);
      unsigned long block, blocks;
      unsigned char *ptr = us->iobuf;
      static unsigned char inquiry_response[36] = {
            0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
      };

      if (srb->cmnd[0] == INQUIRY) {
            US_DEBUGP("usbat_flash_transport: INQUIRY. Returning bogus response.\n");
            memcpy(ptr, inquiry_response, sizeof(inquiry_response));
            fill_inquiry_response(us, ptr, 36);
            return USB_STOR_TRANSPORT_GOOD;
      }

      if (srb->cmnd[0] == READ_CAPACITY) {
            rc = usbat_flash_check_media(us, info);
            if (rc != USB_STOR_TRANSPORT_GOOD)
                  return rc;

            rc = usbat_flash_get_sector_count(us, info);
            if (rc != USB_STOR_TRANSPORT_GOOD)
                  return rc;

            /* hard coded 512 byte sectors as per ATA spec */
            info->ssize = 0x200;
            US_DEBUGP("usbat_flash_transport: READ_CAPACITY: %ld sectors, %ld bytes per sector\n",
                    info->sectors, info->ssize);

            /*
             * build the reply
             * note: must return the sector number of the last sector,
             * *not* the total number of sectors
             */
            ((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);
            ((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);
            usb_stor_set_xfer_buf(ptr, 8, srb);

            return USB_STOR_TRANSPORT_GOOD;
      }

      if (srb->cmnd[0] == MODE_SELECT_10) {
            US_DEBUGP("usbat_flash_transport:  Gah! MODE_SELECT_10.\n");
            return USB_STOR_TRANSPORT_ERROR;
      }

      if (srb->cmnd[0] == READ_10) {
            block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

            blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

            US_DEBUGP("usbat_flash_transport:  READ_10: read block 0x%04lx  count %ld\n", block, blocks);
            return usbat_flash_read_data(us, info, block, blocks);
      }

      if (srb->cmnd[0] == READ_12) {
            /*
             * I don't think we'll ever see a READ_12 but support it anyway
             */
            block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                    ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

            blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
                     ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

            US_DEBUGP("usbat_flash_transport: READ_12: read block 0x%04lx  count %ld\n", block, blocks);
            return usbat_flash_read_data(us, info, block, blocks);
      }

      if (srb->cmnd[0] == WRITE_10) {
            block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                    ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

            blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

            US_DEBUGP("usbat_flash_transport: WRITE_10: write block 0x%04lx  count %ld\n", block, blocks);
            return usbat_flash_write_data(us, info, block, blocks);
      }

      if (srb->cmnd[0] == WRITE_12) {
            /*
             * I don't think we'll ever see a WRITE_12 but support it anyway
             */
            block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                    ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

            blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
                     ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

            US_DEBUGP("usbat_flash_transport: WRITE_12: write block 0x%04lx  count %ld\n", block, blocks);
            return usbat_flash_write_data(us, info, block, blocks);
      }


      if (srb->cmnd[0] == TEST_UNIT_READY) {
            US_DEBUGP("usbat_flash_transport: TEST_UNIT_READY.\n");

            rc = usbat_flash_check_media(us, info);
            if (rc != USB_STOR_TRANSPORT_GOOD)
                  return rc;

            return usbat_check_status(us);
      }

      if (srb->cmnd[0] == REQUEST_SENSE) {
            US_DEBUGP("usbat_flash_transport: REQUEST_SENSE.\n");

            memset(ptr, 0, 18);
            ptr[0] = 0xF0;
            ptr[2] = info->sense_key;
            ptr[7] = 11;
            ptr[12] = info->sense_asc;
            ptr[13] = info->sense_ascq;
            usb_stor_set_xfer_buf(ptr, 18, srb);

            return USB_STOR_TRANSPORT_GOOD;
      }

      if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
            /*
             * sure.  whatever.  not like we can stop the user from popping
             * the media out of the device (no locking doors, etc)
             */
            return USB_STOR_TRANSPORT_GOOD;
      }

      US_DEBUGP("usbat_flash_transport: Gah! Unknown command: %d (0x%x)\n",
                    srb->cmnd[0], srb->cmnd[0]);
      info->sense_key = 0x05;
      info->sense_asc = 0x20;
      info->sense_ascq = 0x00;
      return USB_STOR_TRANSPORT_FAILED;
}

int init_usbat_cd(struct us_data *us)
{
      return init_usbat(us, USBAT_DEV_HP8200);
}


int init_usbat_flash(struct us_data *us)
{
      return init_usbat(us, USBAT_DEV_FLASH);
}

int init_usbat_probe(struct us_data *us)
{
      return init_usbat(us, 0);
}

/*
 * Default transport function. Attempts to detect which transport function
 * should be called, makes it the new default, and calls it.
 *
 * This function should never be called. Our usbat_init() function detects the
 * device type and changes the us->transport ptr to the transport function
 * relevant to the device.
 * However, we'll support this impossible(?) case anyway.
 */
int usbat_transport(struct scsi_cmnd *srb, struct us_data *us)
{
      struct usbat_info *info = (struct usbat_info*) (us->extra);

      if (usbat_set_transport(us, info, 0))
            return USB_STOR_TRANSPORT_ERROR;

      return us->transport(srb, us);      
}

Generated by  Doxygen 1.6.0   Back to index