// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for USB Mass Storage compliant devices
*
* Current development and maintenance by:
* (c) 1999-2003 Matthew Dharm ([email protected])
*
* Developed with the assistance of:
* (c) 2000 David L. Brown, Jr. ([email protected])
* (c) 2003-2009 Alan Stern ([email protected])
*
* Initial work by:
* (c) 1999 Michael Gee ([email protected])
*
* usb_device_id support by Adam J. Richter ([email protected]):
* (c) 2000 Yggdrasil Computing, Inc.
*
* This driver is based on the 'USB Mass Storage Class' document. This
* describes in detail the protocol used to communicate with such
* devices. Clearly, the designers had SCSI and ATAPI commands in
* mind when they created this document. The commands are all very
* similar to commands in the SCSI-II and ATAPI specifications.
*
* It is important to note that in a number of cases this class
* exhibits class-specific exemptions from the USB specification.
* Notably the usage of NAK, STALL and ACK differs from the norm, in
* that they are used to communicate wait, failed and OK on commands.
*
* Also, for certain devices, the interrupt endpoint is used to convey
* status of a command.
*/
#ifdef CONFIG_USB_STORAGE_DEBUG
#define DEBUG
#endif
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/utsname.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include "usb.h"
#include <linux/usb/hcd.h>
#include "scsiglue.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "initializers.h"
#include "sierra_ms.h"
#include "option_ms.h"
#if IS_ENABLED(CONFIG_USB_UAS)
#include "uas-detect.h"
#endif
#define DRV_NAME "usb-storage"
/* Some informational data */
MODULE_AUTHOR("Matthew Dharm <[email protected]>");
MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
MODULE_LICENSE("GPL");
static unsigned int delay_use = 1 * MSEC_PER_SEC;
/**
* parse_delay_str - parse an unsigned decimal integer delay
* @str: String to parse.
* @ndecimals: Number of decimal to scale up.
* @suffix: Suffix string to parse.
* @val: Where to store the parsed value.
*
* Parse an unsigned decimal value in @str, optionally end with @suffix.
* Stores the parsed value in @val just as it is if @str ends with @suffix.
* Otherwise store the value scale up by 10^(@ndecimal).
*
* Returns 0 on success, a negative error code otherwise.
*/
static int parse_delay_str(const char *str, int ndecimals, const char *suffix,
unsigned int *val)
{
int n, n2, l;
char buf[16];
l = strlen(suffix);
n = strlen(str);
if (n > 0 && str[n - 1] == '\n')
--n;
if (n >= l && !strncmp(&str[n - l], suffix, l)) {
n -= l;
n2 = 0;
} else
n2 = ndecimals;
if (n + n2 > sizeof(buf) - 1)
return -EINVAL;
memcpy(buf, str, n);
while (n2-- > 0)
buf[n++] = '0';
buf[n] = 0;
return kstrtouint(buf, 10, val);
}
/**
* format_delay_ms - format an integer value into a delay string
* @val: The integer value to format, scaled by 10^(@ndecimals).
* @ndecimals: Number of decimal to scale down.
* @suffix: Suffix string to format.
* @str: Where to store the formatted string.
* @size: The size of buffer for @str.
*
* Format an integer value in @val scale down by 10^(@ndecimals) without @suffix
* if @val is divisible by 10^(@ndecimals).
* Otherwise format a value in @val just as it is with @suffix
*
* Returns the number of characters written into @str.
*/
static int format_delay_ms(unsigned int val, int ndecimals, const char *suffix,
char *str, int size)
{
u64 delay_ms = val;
unsigned int rem = do_div(delay_ms, int_pow(10, ndecimals));
int ret;
if (rem)
ret = scnprintf(str, size, "%u%s\n", val, suffix);
else
ret = scnprintf(str, size, "%u\n", (unsigned int)delay_ms);
return ret;
}
static int delay_use_set(const char *s, const struct kernel_param *kp)
{
unsigned int delay_ms;
int ret;
ret = parse_delay_str(skip_spaces(s), 3, "ms", &delay_ms);
if (ret < 0)
return ret;
*((unsigned int *)kp->arg) = delay_ms;
return 0;
}
static int delay_use_get(char *s, const struct kernel_param *kp)
{
unsigned int delay_ms = *((unsigned int *)kp->arg);
return format_delay_ms(delay_ms, 3, "ms", s, PAGE_SIZE);
}
static const struct kernel_param_ops delay_use_ops = {
.set = delay_use_set,
.get = delay_use_get,
};
module_param_cb(delay_use, &delay_use_ops, &delay_use, 0644);
MODULE_PARM_DESC(delay_use, "time to delay before using a new device");
static char quirks[128];
module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
/*
* The entries in this table correspond, line for line,
* with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
*/
/*
*The vendor name should be kept at eight characters or less, and
* the product name should be kept at 16 characters or less. If a device
* has the US_FL_FIX_INQUIRY flag, then the vendor and product names
* normally generated by a device through the INQUIRY response will be
* taken from this list, and this is the reason for the above size
* restriction. However, if the flag is not present, then you
* are free to use as many characters as you like.
*/
#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
vendor_name, product_name, use_protocol, use_transport, \
init_function, Flags) \
{ \
.vendorName = vendor_name, \
.productName = product_name, \
.useProtocol = use_protocol, \
.useTransport = use_transport, \
.initFunction = init_function, \
}
#define COMPLIANT_DEV UNUSUAL_DEV
#define USUAL_DEV(use_protocol, use_transport) \
{ \
.useProtocol = use_protocol, \
.useTransport = use_transport, \
}
static const struct us_unusual_dev us_unusual_dev_list[] = {
# include "unusual_devs.h"
{ } /* Terminating entry */
};
static const struct us_unusual_dev for_dynamic_ids =
USUAL_DEV(USB_SC_SCSI, USB_PR_BULK);
#undef UNUSUAL_DEV
#undef COMPLIANT_DEV
#undef USUAL_DEV
#ifdef CONFIG_LOCKDEP
static struct lock_class_key us_interface_key[USB_MAXINTERFACES];
static void us_set_lock_class(struct mutex *mutex,
struct usb_interface *intf)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_host_config *config = udev->actconfig;
int i;
for (i = 0; i < config->desc.bNumInterfaces; i++) {
if (config->interface[i] == intf)
break;
}
BUG_ON(i == config->desc.bNumInterfaces);
lockdep_set_class(mutex, &us_interface_key[i]);
}
#else
static void us_set_lock_class(struct mutex *mutex,
struct usb_interface *intf)
{
}
#endif
#ifdef CONFIG_PM /* Minimal support for suspend and resume */
int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
{
struct us_data *us = usb_get_intfdata(iface);
/* Wait until no command is running */
mutex_lock(&us->dev_mutex);
if (us->suspend_resume_hook)
(us->suspend_resume_hook)(us, US_SUSPEND);
/*
* When runtime PM is working, we'll set a flag to indicate
* whether we should autoresume when a SCSI request arrives.
*/
mutex_unlock(&us->dev_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(usb_stor_suspend);
int usb_stor_resume(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
mutex_lock(&us->dev_mutex);
if (us->suspend_resume_hook)
(us->suspend_resume_hook)(us, US_RESUME);
mutex_unlock(&us->dev_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(usb_stor_resume);
int usb_stor_reset_resume(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
/* Report the reset to the SCSI core */
usb_stor_report_bus_reset(us);
/*
* If any of the subdrivers implemented a reinitialization scheme,
* this is where the callback would be invoked.
*/
return 0;
}
EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
#endif /* CONFIG_PM */
/*
* The next two routines get called just before and just after
* a USB port reset, whether from this driver or a different one.
*/
int usb_stor_pre_reset(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
/* Make sure no command runs during the reset */
mutex_lock(&us->dev_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
int usb_stor_post_reset(struct usb_interface *iface)
{
struct us_data *us = usb_get_intfdata(iface);
/* Report the reset to the SCSI core */
usb_stor_report_bus_reset(us);
/*
* If any of the subdrivers implemented a reinitialization scheme,
* this is where the callback would be invoked.
*/
mutex_unlock(&us->dev_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(usb_stor_post_reset);
/*
* fill_inquiry_response takes an unsigned char array (which must
* be at least 36 characters) and populates the vendor name,
* product name, and revision fields. Then the array is copied
* into the SCSI command's response buffer (oddly enough
* called request_buffer). data_len contains the length of the
* data array, which again must be at least 36.
*/
void fill_inquiry_response(struct us_data *us, unsigned char *data,
unsigned int data_len)
{
if (data_len < 36) /* You lose. */
return;
memset(data+8, ' ', 28);
if (data[0]&0x20) { /*
* USB device currently not connected. Return
* peripheral qualifier 001b ("...however, the
* physical device is not currently connected
* to this logical unit") and leave vendor and
* product identification empty. ("If the target
* does store some of the INQUIRY data on the
* device, it may return zeros or ASCII spaces
* (20h) in those fields until the data is
* available from the device.").
*/
} else {
u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
int n;
n = strlen(us->unusual_dev->vendorName);
memcpy(data+8, us->unusual_dev->vendorName, min(8, n));
n = strlen(us->unusual_dev->productName);
memcpy(data+16, us->unusual_dev->productName, min(16, n));
data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
data[35] = 0x30 + ((bcdDevice) & 0x0F);
}
usb_stor_set_xfer_buf(data, data_len, us->srb);
}
EXPORT_SYMBOL_GPL(fill_inquiry_response);
static int usb_stor_control_thread(void * __us)
{
struct us_data *us = (struct us_data *)__us;
struct Scsi_Host *host = us_to_host(us);
struct scsi_cmnd *srb;
for (;;) {
usb_stor_dbg(us, "*** thread sleeping\n");
if (wait_for_completion_interruptible(&us->cmnd_ready))
break;
usb_stor_dbg(us, "*** thread awakened\n");
/* lock the device pointers */
mutex_lock(&(us->dev_mutex));
/* lock access to the state */
scsi_lock(host);
/* When we are called with no command pending, we're done */
srb = us->srb;
if (srb == NULL) {
scsi_unlock(host);
mutex_unlock(&us->dev_mutex);
usb_stor_dbg(us, "-- exiting\n");
break;
}
/* has the command timed out *already* ? */
if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
srb->result = DID_ABORT << 16;
goto SkipForAbort;
}
scsi_unlock(host);
/*
* reject the command if the direction indicator
* is UNKNOWN
*/
if (srb->sc_data_direction == DMA_BIDIRECTIONAL) {
usb_stor_dbg(us, "UNKNOWN data direction\n");
srb->result = DID_ERROR << 16;
}
/*
* reject if target != 0 or if LUN is higher than
* the maximum known LUN
*/
else if (srb->device->id &&
!(us->fflags & US_FL_SCM_MULT_TARG)) {
usb_stor_dbg(us, "Bad target number (%d:%llu)\n",
srb->device->id,
srb->device->lun);
srb->result = DID_BAD_TARGET << 16;
}
else if (srb->device->lun > us->max_lun) {
usb_stor_dbg(us, "Bad LUN (%d:%llu)\n",
srb->device->id,
srb->device->lun);
srb->result = DID_BAD_TARGET << 16;
}
/*
* Handle those devices which need us to fake
* their inquiry data
*/
else if ((srb->cmnd[0] == INQUIRY) &&
(us->fflags & US_FL_FIX_INQUIRY)) {
unsigned char data_ptr[36] = {
0x00, 0x80, 0x02, 0x02,
0x1F, 0x00, 0x00, 0x00};
usb_stor_dbg(us, "Faking INQUIRY command\n");
fill_inquiry_response(us, data_ptr, 36);
srb->result = SAM_STAT_GOOD;
}
/* we've got a command, let's do it! */
else {
US_DEBUG(usb_stor_show_command(us, srb));
us->proto_handler(srb, us);
usb_mark_last_busy(us->pusb_dev);
}
/* lock access to the state */
scsi_lock(host);
/* was the command aborted? */
if (srb->result == DID_ABORT << 16) {
SkipForAbort:
usb_stor_dbg(us, "scsi command aborted\n");
srb = NULL; /* Don't call scsi_done() */
}
/*
* If an abort request was received we need to signal that
* the abort has finished. The proper test for this is
* the TIMED_OUT flag, not srb->result == DID_ABORT, because
* the timeout might have occurred after the command had
* already completed with a different result code.
*/
if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
complete(&(us->notify));
/* Allow USB transfers to resume */
clear_bit(US_FLIDX_ABORTING, &us->dflags);
clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
}
/* finished working on this command */
us->srb = NULL;
scsi_unlock(host);
/* unlock the device pointers */
mutex_unlock(&us->dev_mutex);
/* now that the locks are released, notify the SCSI core */
if (srb) {
usb_stor_dbg(us, "scsi cmd done, result=0x%x\n",
srb->result);
scsi_done_direct(srb);
}
} /* for (;;) */
/* Wait until we are told to stop */
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (kthread_should_stop())
break;
schedule();
}
__set_current_state(TASK_RUNNING);
return 0;
}
/***********************************************************************
* Device probing and disconnecting
***********************************************************************/
/* Associate our private data with the USB device */
static int associate_dev(struct us_data *us, struct usb_interface *intf)
{
/* Fill in the device-related fields */
us->pusb_dev = interface_to_usbdev(intf);
us->pusb_intf = intf;
us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
usb_stor_dbg(us, "Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
le16_to_cpu(us->pusb_dev->descriptor.idVendor),
le16_to_cpu(us->pusb_dev->descriptor.idProduct),
le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
usb_stor_dbg(us, "Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
intf->cur_altsetting->desc.bInterfaceSubClass,
intf->cur_altsetting->desc.bInterfaceProtocol);
/* Store our private data in the interface */
usb_set_intfdata(intf, us);
/* Allocate the control/setup and DMA-mapped buffers */
us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
if (!us->cr)
return -ENOMEM;
us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE,
GFP_KERNEL, &us->iobuf_dma);
if (!us->iobuf) {
usb_stor_dbg(us, "I/O buffer allocation failed\n");
return -ENOMEM;
}
return 0;
}
/* Works only for digits and letters, but small and fast */
#define TOLOWER(x) ((x) | 0x20)
/* Adjust device flags based on the "quirks=" module parameter */
void usb_stor_adjust_quirks(struct usb_device *udev, u64 *fflags)
{
char *p;
u16 vid = le16_to_cpu(udev->descriptor.idVendor);
u16 pid = le16_to_cpu(udev->descriptor.idProduct);
u64 f = 0;
u64 mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE |
US_FL_FIX_CAPACITY | US_FL_IGNORE_UAS |
US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE |
US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES |
US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS |
US_FL_ALWAYS_SYNC);
p = quirks;
while (*p) {
/* Each entry consists of VID:PID:flags */
if (vid == simple_strtoul(p, &p, 16) &&
*p == ':' &&
pid == simple_strtoul(p+1, &p, 16) &&
*p == ':')
break;
/* Move forward to the next entry */
while (*p) {
if (*p++ == ',')
break;
}
}
if (!*p) /* No match */
return;
/* Collect the flags */
while (*++p && *p != ',') {
switch (TOLOWER(*p)) {
case 'a':
f |= US_FL_SANE_SENSE;
break;
case 'b':
f |= US_FL_BAD_SENSE;
break;
case 'c':
f |= US_FL_FIX_CAPACITY;
break;
case 'd':
f |= US_FL_NO_READ_DISC_INFO;
break;
case 'e':
f |= US_FL_NO_READ_CAPACITY_16;
break;
case 'f':
f |= US_FL_NO_REPORT_OPCODES;
break;
case 'g':
f |= US_FL_MAX_SECTORS_240;
break;
case 'h':
f |= US_FL_CAPACITY_HEURISTICS;
break;
case 'i':
f |= US_FL_IGNORE_DEVICE;
break;
case 'j':
f |= US_FL_NO_REPORT_LUNS;
break;
case 'k':
f |= US_FL_NO_SAME;
break;
case 'l':
f |= US_FL_NOT_LOCKABLE;
break;
case 'm':
f |= US_FL_MAX_SECTORS_64;
break;
case 'n':
f |= US_FL_INITIAL_READ10;
break;
case 'o':
f |= US_FL_CAPACITY_OK;
break;
case 'p':
f |= US_FL_WRITE_CACHE;
break;
case 'r':
f |= US_FL_IGNORE_RESIDUE;
break;
case 's':
f |= US_FL_SINGLE_LUN;
break;
case 't':
f |= US_FL_NO_ATA_1X;
break;
case 'u':
f |= US_FL_IGNORE_UAS;
break;
case 'w':
f |= US_FL_NO_WP_DETECT;
break;
case 'y':
f |= US_FL_ALWAYS_SYNC;
break;
/* Ignore unrecognized flag characters */
}
}
*fflags = (*fflags & ~mask) | f;
}
EXPORT_SYMBOL_GPL(usb_stor_adjust_quirks);
/* Get the unusual_devs entries and the string descriptors */
static int get_device_info(struct us_data *us, const struct usb_device_id *id,
const struct us_unusual_dev *unusual_dev)
{
struct usb_device *dev = us->pusb_dev;
struct usb_interface_descriptor *idesc =
&us->pusb_intf->cur_altsetting->desc;
struct device *pdev = &us->pusb_intf->dev;
/* Store the entries */
us->unusual_dev = unusual_dev;
us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ?
idesc->bInterfaceSubClass :
unusual_dev->useProtocol;
us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ?
idesc->bInterfaceProtocol :
unusual_dev->useTransport;
us->fflags = id->driver_info;
usb_stor_adjust_quirks(us->pusb_dev, &us->fflags);
if (us->fflags & US_FL_IGNORE_DEVICE) {
dev_info(pdev, "device ignored\n");
return -ENODEV;
}
/*
* This flag is only needed when we're in high-speed, so let's
* disable it if we're in full-speed
*/
if (dev->speed != USB_SPEED_HIGH)
us->fflags &= ~US_FL_GO_SLOW;
if (us->fflags)
dev_info(pdev, "Quirks match for vid %04x pid %04x: %llx\n",
le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct),
us->fflags);
/*
* Log a message if a non-generic unusual_dev entry contains an
* unnecessary subclass or protocol override. This may stimulate
* reports from users that will help us remove unneeded entries
* from the unusual_devs.h table.
*/
if (id->idVendor || id->idProduct) {
static const char *msgs[3] = {
"an unneeded SubClass entry",
"an unneeded Protocol entry",
"unneeded SubClass and Protocol entries"};
struct usb_device_descriptor *ddesc = &dev->descriptor;
int msg = -1;
if (unusual_dev->useProtocol != USB_SC_DEVICE &&
us->subclass == idesc->bInterfaceSubClass)
msg += 1;
if (unusual_dev->useTransport != USB_PR_DEVICE &&
us->protocol == idesc->bInterfaceProtocol)
msg += 2;
if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
dev_notice(pdev, "This device "
"(%04x,%04x,%04x S %02x P %02x)"
" has %s in unusual_devs.h (kernel"
" %s)\n"
" Please send a copy of this message to "
"<[email protected]> and "
"<[email protected]>\n",
le16_to_cpu(ddesc->idVendor),
le16_to_cpu(ddesc->idProduct),
le16_to_cpu(ddesc->bcdDevice),
idesc->bInterfaceSubClass,
idesc->bInterfaceProtocol,
msgs[msg],
utsname()->release);
}
return 0;
}
/* Get the transport settings */
static void get_transport(struct us_data *us)
{
switch (us->protocol) {
case USB_PR_CB:
us->transport_name = "Control/Bulk";
us->transport = usb_stor_CB_transport;
us->transport_reset = usb_stor_CB_reset;
us->max_lun = 7;
break;
case USB_PR_CBI:
us->transport_name = "Control/Bulk/Interrupt";
us->transport = usb_stor_CB_transport;
us->transport_reset = usb_stor_CB_reset;
us->max_lun = 7;
break;
case USB_PR_BULK:
us->transport_name = "Bulk";
us->transport = usb_stor_Bulk_transport;
us->transport_reset = usb_stor_Bulk_reset;
break;
}
}
/* Get the protocol settings */
static void get_protocol(struct us_data *us)
{
switch (us->subclass) {
case USB_SC_RBC:
us->protocol_name = "Reduced Block Commands (RBC)";
us->proto_handler = usb_stor_transparent_scsi_command;
break;
case USB_SC_8020:
us->protocol_name = "8020i";
us->proto_handler = usb_stor_pad12_command;
us->max_lun = 0;
break;
case USB_SC_QIC:
us->protocol_name = "QIC-157";
us->proto_handler = usb_stor_pad12_command;
us->max_lun = 0;
break;
case USB_SC_8070:
us->protocol_name = "8070i";
us->proto_handler = usb_stor_pad12_command;
us->max_lun = 0;
break;
case USB_SC_SCSI:
us->protocol_name = "Transparent SCSI";
us->proto_handler = usb_stor_transparent_scsi_command;
break;
case USB_SC_UFI:
us->protocol_name = "Uniform Floppy Interface (UFI)";
us->proto_handler = usb_stor_ufi_command;
break;
}
}
/* Get the pipe settings */
static int get_pipes(struct us_data *us)
{
struct usb_host_interface *alt = us->pusb_intf->cur_altsetting;
struct usb_endpoint_descriptor *ep_in;
struct usb_endpoint_descriptor *ep_out;
struct usb_endpoint_descriptor *ep_int;
int res;
/*
* Find the first endpoint of each type we need.
* We are expecting a minimum of 2 endpoints - in and out (bulk).
* An optional interrupt-in is OK (necessary for CBI protocol).
* We will ignore any others.
*/
res = usb_find_common_endpoints(alt, &ep_in, &ep_out, NULL, NULL);
if (res) {
usb_stor_dbg(us, "bulk endpoints not found\n");
return res;
}
res = usb_find_int_in_endpoint(alt, &ep_int);
if (res && us->protocol == USB_PR_CBI) {
usb_stor_dbg(us, "interrupt endpoint not found\n");
return res;
}
/* Calculate and store the pipe values */
us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
usb_endpoint_num(ep_out));
us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
usb_endpoint_num(ep_in));
if (ep_int) {
us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
usb_endpoint_num(ep_int));
us->ep_bInterval = ep_int->bInterval;
}
return 0;
}
/* Initialize all the dynamic resources we need */
static int usb_stor_acquire_resources(struct us_data *us)
{
int p;
struct task_struct *th;
us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!us->current_urb)
return -ENOMEM;
/*
* Just before we start our control thread, initialize
* the device if it needs initialization
*/
if (us->unusual_dev->initFunction) {
p = us->unusual_dev->initFunction(us);
if (p)
return p;
}
/* Start up our control thread */
th = kthread_run(usb_stor_control_thread, us, "usb-storage");
if (IS_ERR(th)) {
dev_warn(&us->pusb_intf->dev,
"Unable to start control thread\n");
return PTR_ERR(th);
}
us->ctl_thread = th;
return 0;
}
/* Release all our dynamic resources */
static void usb_stor_release_resources(struct us_data *us)
{
/*
* Tell the control thread to exit. The SCSI host must
* already have been removed and the DISCONNECTING flag set
* so that we won't accept any more commands.
*/
usb_stor_dbg(us, "-- sending exit command to thread\n");
complete(&us->cmnd_ready);
if (us->ctl_thread)
kthread_stop(us->ctl_thread);
/* Call the destructor routine, if it exists */
if (us->extra_destructor) {
usb_stor_dbg(us, "-- calling extra_destructor()\n");
us->extra_destructor(us->extra);
}
/* Free the extra data and the URB */
kfree(us->extra);
usb_free_urb(us->current_urb);
}
/* Dissociate from the USB device */
static void dissociate_dev(struct us_data *us)
{
/* Free the buffers */
kfree(us->cr);
usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
/* Remove our private data from the interface */
usb_set_intfdata(us->pusb_intf, NULL);
}
/*
* First stage of disconnect processing: stop SCSI scanning,
* remove the host, and stop accepting new commands
*/
static void quiesce_and_remove_host(struct us_data *us)
{
struct Scsi_Host *host = us_to_host(us);
/* If the device is really gone, cut short reset delays */
if (us->pusb_dev->state == USB_STATE_NOTATTACHED) {
set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
wake_up(&us->delay_wait);
}
/*
* Prevent SCSI scanning (if it hasn't started yet)
* or wait for the SCSI-scanning routine to stop.
*/
cancel_delayed_work_sync(&us->scan_dwork);
/* Balance autopm calls if scanning was cancelled */
if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags))
usb_autopm_put_interface_no_suspend(us->pusb_intf);
/*
* Removing the host will perform an orderly shutdown: caches
* synchronized, disks spun down, etc.
*/
scsi_remove_host(host);
/*
* Prevent any new commands from being accepted and cut short
* reset delays.
*/
scsi_lock(host);
set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
scsi_unlock(host);
wake_up(&us->delay_wait);
}
/* Second stage of disconnect processing: deallocate all resources */
static void release_everything(struct us_data *us)
{
usb_stor_release_resources(us);
dissociate_dev(us);
/*
* Drop our reference to the host; the SCSI core will free it
* (and "us" along with it) when the refcount becomes 0.
*/
scsi_host_put(us_to_host(us));
}
/* Delayed-work routine to carry out SCSI-device scanning */
static void usb_stor_scan_dwork(struct work_struct *work)
{
struct us_data *us = container_of(work, struct us_data,
scan_dwork.work);
struct device *dev = &us->pusb_intf->dev;
dev_dbg(dev, "starting scan\n");
/* For bulk-only devices, determine the max LUN value */
if (us->protocol == USB_PR_BULK &&
!(us->fflags & US_FL_SINGLE_LUN) &&
!(us->fflags & US_FL_SCM_MULT_TARG)) {
mutex_lock(&us->dev_mutex);
us->max_lun = usb_stor_Bulk_max_lun(us);
/*
* Allow proper scanning of devices that present more than 8 LUNs
* While not affecting other devices that may need the previous
* behavior
*/
if (us->max_lun >= 8)
us_to_host(us)->max_lun = us->max_lun+1;
mutex_unlock(&us->dev_mutex);
}
scsi_scan_host(us_to_host(us));
dev_dbg(dev, "scan complete\n");
/* Should we unbind if no devices were detected? */
usb_autopm_put_interface(us->pusb_intf);
clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
}
static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
{
struct usb_device *usb_dev = interface_to_usbdev(intf);
if (usb_dev->bus->sg_tablesize) {
return usb_dev->bus->sg_tablesize;
}
return SG_ALL;
}
/* First part of general USB mass-storage probing */
int usb_stor_probe1(struct us_data **pus,
struct usb_interface *intf,
const struct usb_device_id *id,
const struct us_unusual_dev *unusual_dev,
const struct scsi_host_template *sht)
{
struct Scsi_Host *host;
struct us_data *us;
int result;
dev_info(&intf->dev, "USB Mass Storage device detected\n");
/*
* Ask the SCSI layer to allocate a host structure, with extra
* space at the end for our private us_data structure.
*/
host = scsi_host_alloc(sht, sizeof(*us));
if (!host) {
dev_warn(&intf->dev, "Unable to allocate the scsi host\n");
return -ENOMEM;
}
/*
* Allow 16-byte CDBs and thus > 2TB
*/
host->max_cmd_len = 16;
host->sg_tablesize = usb_stor_sg_tablesize(intf);
*pus = us = host_to_us(host);
mutex_init(&(us->dev_mutex));
us_set_lock_class(&us->dev_mutex, intf);
init_completion(&us->cmnd_ready);
init_completion(&(us->notify));
init_waitqueue_head(&us->delay_wait);
INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork);
/* Associate the us_data structure with the USB device */
result = associate_dev(us, intf);
if (result)
goto BadDevice;
/*
* Some USB host controllers can't do DMA; they have to use PIO.
* For such controllers we need to make sure the block layer sets
* up bounce buffers in addressable memory.
*/
if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) ||
bus_to_hcd(us->pusb_dev->bus)->localmem_pool)
host->no_highmem = true;
/* Get the unusual_devs entries and the descriptors */
result = get_device_info(us, id, unusual_dev);
if (result)
goto BadDevice;
/* Get standard transport and protocol settings */
get_transport(us);
get_protocol(us);
/*
* Give the caller a chance to fill in specialized transport
* or protocol settings.
*/
return 0;
BadDevice:
usb_stor_dbg(us, "storage_probe() failed\n");
release_everything(us);
return result;
}
EXPORT_SYMBOL_GPL(usb_stor_probe1);
/* Second part of general USB mass-storage probing */
int usb_stor_probe2(struct us_data *us)
{
int result;
struct device *dev = &us->pusb_intf->dev;
/* Make sure the transport and protocol have both been set */
if (!us->transport || !us->proto_handler) {
result = -ENXIO;
goto BadDevice;
}
usb_stor_dbg(us, "Transport: %s\n", us->transport_name);
usb_stor_dbg(us, "Protocol: %s\n", us->protocol_name);
if (us->fflags & US_FL_SCM_MULT_TARG) {
/*
* SCM eUSCSI bridge devices can have different numbers
* of LUNs on different targets; allow all to be probed.
*/
us->max_lun = 7;
/* The eUSCSI itself has ID 7, so avoid scanning that */
us_to_host(us)->this_id = 7;
/* max_id is 8 initially, so no need to set it here */
} else {
/* In the normal case there is only a single target */
us_to_host(us)->max_id = 1;
/*
* Like Windows, we won't store the LUN bits in CDB[1] for
* SCSI-2 devices using the Bulk-Only transport (even though
* this violates the SCSI spec).
*/
if (us->transport == usb_stor_Bulk_transport)
us_to_host(us)->no_scsi2_lun_in_cdb = 1;
}
/* fix for single-lun devices */
if (us->fflags & US_FL_SINGLE_LUN)
us->max_lun = 0;
/* Find the endpoints and calculate pipe values */
result = get_pipes(us);
if (result)
goto BadDevice;
/*
* If the device returns invalid data for the first READ(10)
* command, indicate the command should be retried.
*/
if (us->fflags & US_FL_INITIAL_READ10)
set_bit(US_FLIDX_REDO_READ10, &us->dflags);
/* Acquire all the other resources and add the host */
result = usb_stor_acquire_resources(us);
if (result)
goto BadDevice;
usb_autopm_get_interface_no_resume(us->pusb_intf);
snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s",
dev_name(&us->pusb_intf->dev));
result = scsi_add_host(us_to_host(us), dev);
if (result) {
dev_warn(dev,
"Unable to add the scsi host\n");
goto HostAddErr;
}
/* Submit the delayed_work for SCSI-device scanning */
set_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
if (delay_use > 0)
dev_dbg(dev, "waiting for device to settle before scanning\n");
queue_delayed_work(system_freezable_wq, &us->scan_dwork,
msecs_to_jiffies(delay_use));
return 0;
/* We come here if there are any problems */
HostAddErr:
usb_autopm_put_interface_no_suspend(us->pusb_intf);
BadDevice:
usb_stor_dbg(us, "storage_probe() failed\n");
release_everything(us);
return result;
}
EXPORT_SYMBOL_GPL(usb_stor_probe2);
/* Handle a USB mass-storage disconnect */
void usb_stor_disconnect(struct usb_interface *intf)
{
struct us_data *us = usb_get_intfdata(intf);
quiesce_and_remove_host(us);
release_everything(us);
}
EXPORT_SYMBOL_GPL(usb_stor_disconnect);
static struct scsi_host_template usb_stor_host_template;
/* The main probe routine for standard devices */
static int storage_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
const struct us_unusual_dev *unusual_dev;
struct us_data *us;
int result;
int size;
/* If uas is enabled and this device can do uas then ignore it. */
#if IS_ENABLED(CONFIG_USB_UAS)
if (uas_use_uas_driver(intf, id, NULL))
return -ENXIO;
#endif
/*
* If the device isn't standard (is handled by a subdriver
* module) then don't accept it.
*/
if (usb_usual_ignore_device(intf))
return -ENXIO;
/*
* Call the general probe procedures.
*
* The unusual_dev_list array is parallel to the usb_storage_usb_ids
* table, so we use the index of the id entry to find the
* corresponding unusual_devs entry.
*/
size = ARRAY_SIZE(us_unusual_dev_list);
if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) {
unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list;
} else {
unusual_dev = &for_dynamic_ids;
dev_dbg(&intf->dev, "Use Bulk-Only transport with the Transparent SCSI protocol for dynamic id: 0x%04x 0x%04x\n",
id->idVendor, id->idProduct);
}
result = usb_stor_probe1(&us, intf, id, unusual_dev,
&usb_stor_host_template);
if (result)
return result;
/* No special transport or protocol settings in the main module */
result = usb_stor_probe2(us);
return result;
}
static struct usb_driver usb_storage_driver = {
.name = DRV_NAME,
.probe = storage_probe,
.disconnect = usb_stor_disconnect,
.suspend = usb_stor_suspend,
.resume = usb_stor_resume,
.reset_resume = usb_stor_reset_resume,
.pre_reset = usb_stor_pre_reset,
.post_reset = usb_stor_post_reset,
.id_table = usb_storage_usb_ids,
.supports_autosuspend = 1,
.soft_unbind = 1,
};
module_usb_stor_driver(usb_storage_driver, usb_stor_host_template, DRV_NAME);
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