grub/grub-core/disk/usbms.c
Vladimir 'phcoder' Serbinenko d68538e928 merge mainline into cbi
2012-02-01 14:30:40 +01:00

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/* usbms.c - USB Mass Storage Support. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/usb.h>
#include <grub/scsi.h>
#include <grub/scsicmd.h>
#include <grub/misc.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define GRUB_USBMS_DIRECTION_BIT 7
/* Length of CBI command should be always 12 bytes */
#define GRUB_USBMS_CBI_CMD_SIZE 12
/* CBI class-specific USB request ADSC - it sends CBI (scsi) command to
* device in DATA stage */
#define GRUB_USBMS_CBI_ADSC_REQ 0x00
/* The USB Mass Storage Command Block Wrapper. */
struct grub_usbms_cbw
{
grub_uint32_t signature;
grub_uint32_t tag;
grub_uint32_t transfer_length;
grub_uint8_t flags;
grub_uint8_t lun;
grub_uint8_t length;
grub_uint8_t cbwcb[16];
} __attribute__ ((packed));
struct grub_usbms_csw
{
grub_uint32_t signature;
grub_uint32_t tag;
grub_uint32_t residue;
grub_uint8_t status;
} __attribute__ ((packed));
struct grub_usbms_dev
{
struct grub_usb_device *dev;
int luns;
int config;
int interface;
struct grub_usb_desc_endp *in;
struct grub_usb_desc_endp *out;
int subclass;
int protocol;
struct grub_usb_desc_endp *intrpt;
};
typedef struct grub_usbms_dev *grub_usbms_dev_t;
/* FIXME: remove limit. */
#define MAX_USBMS_DEVICES 128
static grub_usbms_dev_t grub_usbms_devices[MAX_USBMS_DEVICES];
static int first_available_slot = 0;
static grub_err_t
grub_usbms_cbi_cmd (grub_usb_device_t dev, int interface,
grub_uint8_t *cbicb)
{
return grub_usb_control_msg (dev,
GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
GRUB_USBMS_CBI_ADSC_REQ, 0, interface,
GRUB_USBMS_CBI_CMD_SIZE, (char*)cbicb);
}
static grub_err_t
grub_usbms_cbi_reset (grub_usb_device_t dev, int interface)
{
/* Prepare array with Command Block Reset (=CBR) */
/* CBI specific communication reset command should be send to device
* via CBI USB class specific request ADCS */
struct grub_cbi_reset
{
grub_uint8_t opcode; /* 0x1d = SEND DIAGNOSTIC */
grub_uint8_t lun; /* 7-5 LUN, 4-0 flags - for CBR always = 0x04 */
grub_uint8_t pad[10];
/* XXX: There is collision between CBI and UFI specifications:
* CBI says 0xff, UFI says 0x00 ... probably it does
* not matter ... (?) */
} cbicb = { 0x1d, 0x04,
{ 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff }
};
return grub_usbms_cbi_cmd (dev, interface, (grub_uint8_t *)&cbicb);
}
static grub_err_t
grub_usbms_bo_reset (grub_usb_device_t dev, int interface)
{
grub_usb_err_t u;
u = grub_usb_control_msg (dev, 0x21, 255, 0, interface, 0, 0);
if (u)
return grub_error (GRUB_ERR_IO, "USB error %d", u);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_usbms_reset (grub_usbms_dev_t dev)
{
if (dev->protocol == GRUB_USBMS_PROTOCOL_BULK)
return grub_usbms_bo_reset (dev->dev, dev->interface);
else
return grub_usbms_cbi_reset (dev->dev, dev->interface);
}
static void
grub_usbms_detach (grub_usb_device_t usbdev, int config, int interface)
{
unsigned i;
for (i = 0; i < ARRAY_SIZE (grub_usbms_devices); i++)
if (grub_usbms_devices[i] && grub_usbms_devices[i]->dev == usbdev
&& grub_usbms_devices[i]->interface == interface
&& grub_usbms_devices[i]->config == config)
{
grub_free (grub_usbms_devices[i]);
grub_usbms_devices[i] = 0;
}
}
static int
grub_usbms_attach (grub_usb_device_t usbdev, int configno, int interfno)
{
struct grub_usb_desc_if *interf
= usbdev->config[configno].interf[interfno].descif;
int j;
grub_uint8_t luns = 0;
unsigned curnum;
grub_usb_err_t err = GRUB_ERR_NONE;
if (first_available_slot == ARRAY_SIZE (grub_usbms_devices))
return 0;
curnum = first_available_slot;
first_available_slot++;
interf = usbdev->config[configno].interf[interfno].descif;
if ((interf->subclass != GRUB_USBMS_SUBCLASS_BULK
/* Experimental support of RBC, MMC-2, UFI, SFF-8070i devices */
&& interf->subclass != GRUB_USBMS_SUBCLASS_RBC
&& interf->subclass != GRUB_USBMS_SUBCLASS_MMC2
&& interf->subclass != GRUB_USBMS_SUBCLASS_UFI
&& interf->subclass != GRUB_USBMS_SUBCLASS_SFF8070 )
|| (interf->protocol != GRUB_USBMS_PROTOCOL_BULK
&& interf->protocol != GRUB_USBMS_PROTOCOL_CBI
&& interf->protocol != GRUB_USBMS_PROTOCOL_CB))
return 0;
grub_usbms_devices[curnum] = grub_zalloc (sizeof (struct grub_usbms_dev));
if (! grub_usbms_devices[curnum])
return 0;
grub_usbms_devices[curnum]->dev = usbdev;
grub_usbms_devices[curnum]->interface = interfno;
grub_usbms_devices[curnum]->subclass = interf->subclass;
grub_usbms_devices[curnum]->protocol = interf->protocol;
grub_dprintf ("usbms", "alive\n");
/* Iterate over all endpoints of this interface, at least a
IN and OUT bulk endpoint are required. */
for (j = 0; j < interf->endpointcnt; j++)
{
struct grub_usb_desc_endp *endp;
endp = &usbdev->config[0].interf[interfno].descendp[j];
if ((endp->endp_addr & 128) && (endp->attrib & 3) == 2)
/* Bulk IN endpoint. */
grub_usbms_devices[curnum]->in = endp;
else if (!(endp->endp_addr & 128) && (endp->attrib & 3) == 2)
/* Bulk OUT endpoint. */
grub_usbms_devices[curnum]->out = endp;
else if ((endp->endp_addr & 128) && (endp->attrib & 3) == 3)
/* Interrupt (IN) endpoint. */
grub_usbms_devices[curnum]->intrpt = endp;
}
if (!grub_usbms_devices[curnum]->in || !grub_usbms_devices[curnum]->out
|| ((grub_usbms_devices[curnum]->protocol == GRUB_USBMS_PROTOCOL_CBI)
&& !grub_usbms_devices[curnum]->intrpt))
{
grub_free (grub_usbms_devices[curnum]);
grub_usbms_devices[curnum] = 0;
return 0;
}
grub_dprintf ("usbms", "alive\n");
/* XXX: Activate the first configuration. */
grub_usb_set_configuration (usbdev, 1);
/* Query the amount of LUNs. */
if (grub_usbms_devices[curnum]->protocol == GRUB_USBMS_PROTOCOL_BULK)
{ /* Only Bulk only devices support Get Max LUN command */
err = grub_usb_control_msg (usbdev, 0xA1, 254, 0, interfno, 1, (char *) &luns);
if (err)
{
/* In case of a stall, clear the stall. */
if (err == GRUB_USB_ERR_STALL)
{
grub_usb_clear_halt (usbdev, grub_usbms_devices[curnum]->in->endp_addr);
grub_usb_clear_halt (usbdev, grub_usbms_devices[curnum]->out->endp_addr);
}
/* Just set the amount of LUNs to one. */
grub_errno = GRUB_ERR_NONE;
grub_usbms_devices[curnum]->luns = 1;
}
else
/* luns = 0 means one LUN with ID 0 present ! */
/* We get from device not number of LUNs but highest
* LUN number. LUNs are numbered from 0,
* i.e. number of LUNs is luns+1 ! */
grub_usbms_devices[curnum]->luns = luns + 1;
}
else
/* XXX: Does CBI devices support multiple LUNs ?
* I.e., should we detect number of device's LUNs ? (How?) */
grub_usbms_devices[curnum]->luns = 1;
grub_dprintf ("usbms", "alive\n");
usbdev->config[configno].interf[interfno].detach_hook = grub_usbms_detach;
#if 0 /* All this part should be probably deleted.
* This make trouble on some devices if they are not in
* Phase Error state - and there they should be not in such state...
* Bulk only mass storage reset procedure should be used only
* on place and in time when it is really necessary. */
/* Reset recovery procedure */
/* Bulk-Only Mass Storage Reset, after the reset commands
will be accepted. */
grub_usbms_reset (usbdev, i);
grub_usb_clear_halt (usbdev, usbms->in->endp_addr);
grub_usb_clear_halt (usbdev, usbms->out->endp_addr);
#endif
return 1;
}
static int
grub_usbms_iterate (int NESTED_FUNC_ATTR (*hook) (int id, int bus, int luns),
grub_disk_pull_t pull)
{
unsigned i;
if (pull != GRUB_DISK_PULL_NONE)
return 0;
grub_usb_poll_devices ();
for (i = 0; i < ARRAY_SIZE (grub_usbms_devices); i++)
if (grub_usbms_devices[i])
{
if (hook (GRUB_SCSI_SUBSYSTEM_USBMS, i, grub_usbms_devices[i]->luns))
return 1;
}
return 0;
}
static grub_err_t
grub_usbms_transfer_bo (struct grub_scsi *scsi, grub_size_t cmdsize, char *cmd,
grub_size_t size, char *buf, int read_write)
{
struct grub_usbms_cbw cbw;
grub_usbms_dev_t dev = (grub_usbms_dev_t) scsi->data;
struct grub_usbms_csw status;
static grub_uint32_t tag = 0;
grub_usb_err_t err = GRUB_USB_ERR_NONE;
grub_usb_err_t errCSW = GRUB_USB_ERR_NONE;
int retrycnt = 3 + 1;
retry:
retrycnt--;
if (retrycnt == 0)
return grub_error (GRUB_ERR_IO, "USB Mass Storage stalled");
/* Setup the request. */
grub_memset (&cbw, 0, sizeof (cbw));
cbw.signature = grub_cpu_to_le32 (0x43425355);
cbw.tag = tag++;
cbw.transfer_length = grub_cpu_to_le32 (size);
cbw.flags = (!read_write) << GRUB_USBMS_DIRECTION_BIT;
cbw.lun = scsi->lun; /* In USB MS CBW are LUN bits on another place than in SCSI CDB, both should be set correctly. */
cbw.length = cmdsize;
grub_memcpy (cbw.cbwcb, cmd, cmdsize);
/* Debug print of CBW content. */
grub_dprintf ("usb", "CBW: sign=0x%08x tag=0x%08x len=0x%08x\n",
cbw.signature, cbw.tag, cbw.transfer_length);
grub_dprintf ("usb", "CBW: flags=0x%02x lun=0x%02x CB_len=0x%02x\n",
cbw.flags, cbw.lun, cbw.length);
grub_dprintf ("usb", "CBW: cmd:\n %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
cbw.cbwcb[ 0], cbw.cbwcb[ 1], cbw.cbwcb[ 2], cbw.cbwcb[ 3],
cbw.cbwcb[ 4], cbw.cbwcb[ 5], cbw.cbwcb[ 6], cbw.cbwcb[ 7],
cbw.cbwcb[ 8], cbw.cbwcb[ 9], cbw.cbwcb[10], cbw.cbwcb[11],
cbw.cbwcb[12], cbw.cbwcb[13], cbw.cbwcb[14], cbw.cbwcb[15]);
/* Write the request.
* XXX: Error recovery is maybe still not fully correct. */
err = grub_usb_bulk_write (dev->dev, dev->out->endp_addr,
sizeof (cbw), (char *) &cbw);
if (err)
{
if (err == GRUB_USB_ERR_STALL)
{
grub_usb_clear_halt (dev->dev, dev->out->endp_addr);
goto CheckCSW;
}
return grub_error (GRUB_ERR_IO, "USB Mass Storage request failed");
}
/* Read/write the data, (maybe) according to specification. */
if (size && (read_write == 0))
{
err = grub_usb_bulk_read (dev->dev, dev->in->endp_addr, size, buf);
grub_dprintf ("usb", "read: %d %d\n", err, GRUB_USB_ERR_STALL);
if (err)
{
if (err == GRUB_USB_ERR_STALL)
grub_usb_clear_halt (dev->dev, dev->in->endp_addr);
goto CheckCSW;
}
/* Debug print of received data. */
grub_dprintf ("usb", "buf:\n");
if (size <= 64)
{
unsigned i;
for (i = 0; i < size; i++)
grub_dprintf ("usb", "0x%02x: 0x%02x\n", i, buf[i]);
}
else
grub_dprintf ("usb", "Too much data for debug print...\n");
}
else if (size)
{
err = grub_usb_bulk_write (dev->dev, dev->out->endp_addr, size, buf);
grub_dprintf ("usb", "write: %d %d\n", err, GRUB_USB_ERR_STALL);
grub_dprintf ("usb", "First 16 bytes of sent data:\n %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
buf[ 0], buf[ 1], buf[ 2], buf[ 3],
buf[ 4], buf[ 5], buf[ 6], buf[ 7],
buf[ 8], buf[ 9], buf[10], buf[11],
buf[12], buf[13], buf[14], buf[15]);
if (err)
{
if (err == GRUB_USB_ERR_STALL)
grub_usb_clear_halt (dev->dev, dev->out->endp_addr);
goto CheckCSW;
}
/* Debug print of sent data. */
if (size <= 256)
{
unsigned i;
for (i=0; i<size; i++)
grub_dprintf ("usb", "0x%02x: 0x%02x\n", i, buf[i]);
}
else
grub_dprintf ("usb", "Too much data for debug print...\n");
}
/* Read the status - (maybe) according to specification. */
CheckCSW:
errCSW = grub_usb_bulk_read (dev->dev, dev->in->endp_addr,
sizeof (status), (char *) &status);
if (errCSW)
{
grub_usb_clear_halt (dev->dev, dev->in->endp_addr);
errCSW = grub_usb_bulk_read (dev->dev, dev->in->endp_addr,
sizeof (status), (char *) &status);
if (errCSW)
{ /* Bulk-only reset device. */
grub_dprintf ("usb", "Bulk-only reset device - errCSW\n");
grub_usbms_reset (dev);
grub_usb_clear_halt (dev->dev, dev->in->endp_addr);
grub_usb_clear_halt (dev->dev, dev->out->endp_addr);
goto retry;
}
}
/* Debug print of CSW content. */
grub_dprintf ("usb", "CSW: sign=0x%08x tag=0x%08x resid=0x%08x\n",
status.signature, status.tag, status.residue);
grub_dprintf ("usb", "CSW: status=0x%02x\n", status.status);
/* If phase error or not valid signature, do bulk-only reset device. */
if ((status.status == 2) ||
(status.signature != grub_cpu_to_le32(0x53425355)))
{ /* Bulk-only reset device. */
grub_dprintf ("usb", "Bulk-only reset device - bad status\n");
grub_usbms_reset (dev);
grub_usb_clear_halt (dev->dev, dev->in->endp_addr);
grub_usb_clear_halt (dev->dev, dev->out->endp_addr);
goto retry;
}
/* If "command failed" status or data transfer failed -> error */
if ((status.status || err) && !read_write)
return grub_error (GRUB_ERR_READ_ERROR,
"error communication with USB Mass Storage device");
else if ((status.status || err) && read_write)
return grub_error (GRUB_ERR_WRITE_ERROR,
"error communication with USB Mass Storage device");
return GRUB_ERR_NONE;
}
static grub_err_t
grub_usbms_transfer_cbi (struct grub_scsi *scsi, grub_size_t cmdsize, char *cmd,
grub_size_t size, char *buf, int read_write)
{
grub_usbms_dev_t dev = (grub_usbms_dev_t) scsi->data;
int retrycnt = 3 + 1;
grub_usb_err_t err = GRUB_USB_ERR_NONE;
grub_uint8_t cbicb[GRUB_USBMS_CBI_CMD_SIZE];
grub_uint16_t status;
retry:
retrycnt--;
if (retrycnt == 0)
return grub_error (GRUB_ERR_IO, "USB Mass Storage CBI failed");
/* Setup the request. */
grub_memset (cbicb, 0, sizeof (cbicb));
grub_memcpy (cbicb, cmd,
cmdsize >= GRUB_USBMS_CBI_CMD_SIZE
? GRUB_USBMS_CBI_CMD_SIZE
: cmdsize);
/* Debug print of CBIcb content. */
grub_dprintf ("usb", "cbicb:\n %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
cbicb[ 0], cbicb[ 1], cbicb[ 2], cbicb[ 3],
cbicb[ 4], cbicb[ 5], cbicb[ 6], cbicb[ 7],
cbicb[ 8], cbicb[ 9], cbicb[10], cbicb[11]);
/* Write the request.
* XXX: Error recovery is maybe not correct. */
err = grub_usbms_cbi_cmd (dev->dev, dev->interface, cbicb);
if (err)
{
grub_dprintf ("usb", "CBI cmdcb setup err=%d\n", err);
if (err == GRUB_USB_ERR_STALL)
{
/* Stall in this place probably means bad or unsupported
* command, so we will not try it again. */
return grub_error (GRUB_ERR_IO, "USB Mass Storage CBI request failed");
}
else if (dev->protocol == GRUB_USBMS_PROTOCOL_CBI)
{
/* Try to get status from interrupt pipe */
err = grub_usb_bulk_read (dev->dev, dev->intrpt->endp_addr,
2, (char*)&status);
grub_dprintf ("usb", "CBI cmdcb setup status: err=%d, status=0x%x\n", err, status);
}
/* Any other error could be transport problem, try it again */
goto retry;
}
/* Read/write the data, (maybe) according to specification. */
if (size && (read_write == 0))
{
err = grub_usb_bulk_read (dev->dev, dev->in->endp_addr, size, buf);
grub_dprintf ("usb", "read: %d\n", err);
if (err)
{
if (err == GRUB_USB_ERR_STALL)
grub_usb_clear_halt (dev->dev, dev->in->endp_addr);
goto retry;
}
}
else if (size)
{
err = grub_usb_bulk_write (dev->dev, dev->out->endp_addr, size, buf);
grub_dprintf ("usb", "write: %d\n", err);
if (err)
{
if (err == GRUB_USB_ERR_STALL)
grub_usb_clear_halt (dev->dev, dev->out->endp_addr);
goto retry;
}
}
/* XXX: It is not clear to me yet, how to check status of CBI
* data transfer on devices without interrupt pipe.
* AFAIK there is probably no status phase to indicate possibly
* bad transported data.
* Maybe we should do check on higher level, i.e. issue RequestSense
* command (we do it already in scsi.c) and check returned values
* (we do not it yet) - ? */
if (dev->protocol == GRUB_USBMS_PROTOCOL_CBI)
{ /* Check status in interrupt pipe */
err = grub_usb_bulk_read (dev->dev, dev->intrpt->endp_addr,
2, (char*)&status);
grub_dprintf ("usb", "read status: %d\n", err);
if (err)
{
/* Try to reset device, because it is probably not standard
* situation */
grub_usbms_reset (dev);
grub_usb_clear_halt (dev->dev, dev->in->endp_addr);
grub_usb_clear_halt (dev->dev, dev->out->endp_addr);
grub_usb_clear_halt (dev->dev, dev->intrpt->endp_addr);
goto retry;
}
if (dev->subclass == GRUB_USBMS_SUBCLASS_UFI)
{
/* These devices should return bASC and bASCQ */
if (status != 0)
/* Some error, currently we don't care what it is... */
goto retry;
}
else if (dev->subclass == GRUB_USBMS_SUBCLASS_RBC)
{
/* XXX: I don't understand what returns RBC subclass devices,
* so I don't check it - maybe somebody helps ? */
}
else
{
/* Any other device should return bType = 0 and some bValue */
if (status & 0xff)
return grub_error (GRUB_ERR_IO, "USB Mass Storage CBI status type != 0");
status = (status & 0x0300) >> 8;
switch (status)
{
case 0 : /* OK */
break;
case 1 : /* Fail */
goto retry;
break;
case 2 : /* Phase error */
case 3 : /* Persistent Failure */
grub_dprintf ("usb", "CBI reset device - phase error or persistent failure\n");
grub_usbms_reset (dev);
grub_usb_clear_halt (dev->dev, dev->in->endp_addr);
grub_usb_clear_halt (dev->dev, dev->out->endp_addr);
grub_usb_clear_halt (dev->dev, dev->intrpt->endp_addr);
goto retry;
break;
}
}
}
return err;
}
static grub_err_t
grub_usbms_transfer (struct grub_scsi *scsi, grub_size_t cmdsize, char *cmd,
grub_size_t size, char *buf, int read_write)
{
grub_usbms_dev_t dev = (grub_usbms_dev_t) scsi->data;
if (dev->protocol == GRUB_USBMS_PROTOCOL_BULK)
return grub_usbms_transfer_bo (scsi, cmdsize, cmd, size, buf,
read_write);
else
return grub_usbms_transfer_cbi (scsi, cmdsize, cmd, size, buf,
read_write);
}
static grub_err_t
grub_usbms_read (struct grub_scsi *scsi, grub_size_t cmdsize, char *cmd,
grub_size_t size, char *buf)
{
return grub_usbms_transfer (scsi, cmdsize, cmd, size, buf, 0);
}
static grub_err_t
grub_usbms_write (struct grub_scsi *scsi, grub_size_t cmdsize, char *cmd,
grub_size_t size, const char *buf)
{
return grub_usbms_transfer (scsi, cmdsize, cmd, size, (char *) buf, 1);
}
static grub_err_t
grub_usbms_open (int id, int devnum, struct grub_scsi *scsi)
{
if (id != GRUB_SCSI_SUBSYSTEM_USBMS)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
"not USB Mass Storage device");
grub_usb_poll_devices ();
if (!grub_usbms_devices[devnum])
return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
"unknown USB Mass Storage device");
scsi->data = grub_usbms_devices[devnum];
scsi->luns = grub_usbms_devices[devnum]->luns;
return GRUB_ERR_NONE;
}
static struct grub_scsi_dev grub_usbms_dev =
{
.iterate = grub_usbms_iterate,
.open = grub_usbms_open,
.read = grub_usbms_read,
.write = grub_usbms_write
};
static struct grub_usb_attach_desc attach_hook =
{
.class = GRUB_USB_CLASS_MASS_STORAGE,
.hook = grub_usbms_attach
};
GRUB_MOD_INIT(usbms)
{
grub_usb_register_attach_hook_class (&attach_hook);
grub_scsi_dev_register (&grub_usbms_dev);
}
GRUB_MOD_FINI(usbms)
{
unsigned i;
for (i = 0; i < ARRAY_SIZE (grub_usbms_devices); i++)
{
grub_usbms_devices[i]->dev->config[grub_usbms_devices[i]->config]
.interf[grub_usbms_devices[i]->interface].detach_hook = 0;
grub_usbms_devices[i]->dev->config[grub_usbms_devices[i]->config]
.interf[grub_usbms_devices[i]->interface].attached = 0;
}
grub_usb_unregister_attach_hook_class (&attach_hook);
grub_scsi_dev_unregister (&grub_usbms_dev);
}