1 /* Driver for USB Mass Storage compliant devices
3 * Current development and maintenance by:
4 * (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
6 * Developed with the assistance of:
7 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
8 * (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu)
11 * (c) 1999 Michael Gee (michael@linuxspecific.com)
13 * usb_device_id support by Adam J. Richter (adam@yggdrasil.com):
14 * (c) 2000 Yggdrasil Computing, Inc.
16 * This driver is based on the 'USB Mass Storage Class' document. This
17 * describes in detail the protocol used to communicate with such
18 * devices. Clearly, the designers had SCSI and ATAPI commands in
19 * mind when they created this document. The commands are all very
20 * similar to commands in the SCSI-II and ATAPI specifications.
22 * It is important to note that in a number of cases this class
23 * exhibits class-specific exemptions from the USB specification.
24 * Notably the usage of NAK, STALL and ACK differs from the norm, in
25 * that they are used to communicate wait, failed and OK on commands.
27 * Also, for certain devices, the interrupt endpoint is used to convey
28 * status of a command.
30 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
31 * information about this driver.
33 * This program is free software; you can redistribute it and/or modify it
34 * under the terms of the GNU General Public License as published by the
35 * Free Software Foundation; either version 2, or (at your option) any
38 * This program is distributed in the hope that it will be useful, but
39 * WITHOUT ANY WARRANTY; without even the implied warranty of
40 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41 * General Public License for more details.
43 * You should have received a copy of the GNU General Public License along
44 * with this program; if not, write to the Free Software Foundation, Inc.,
45 * 675 Mass Ave, Cambridge, MA 02139, USA.
48 #include <linux/sched.h>
49 #include <linux/errno.h>
50 #include <linux/freezer.h>
51 #include <linux/module.h>
52 #include <linux/init.h>
53 #include <linux/slab.h>
54 #include <linux/kthread.h>
55 #include <linux/mutex.h>
56 #include <linux/utsname.h>
58 #include <scsi/scsi.h>
59 #include <scsi/scsi_cmnd.h>
60 #include <scsi/scsi_device.h>
64 #include "transport.h"
67 #include "initializers.h"
69 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
72 #ifdef CONFIG_USB_STORAGE_ONETOUCH
75 #ifdef CONFIG_USB_STORAGE_ALAUDA
78 #ifdef CONFIG_USB_STORAGE_KARMA
81 #include "sierra_ms.h"
82 #include "option_ms.h"
84 /* Some informational data */
85 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
86 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
87 MODULE_LICENSE("GPL");
89 static unsigned int delay_use = 5;
90 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
91 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
93 static char quirks[128];
94 module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
95 MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
99 * The entries in this table correspond, line for line,
100 * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
103 /* The vendor name should be kept at eight characters or less, and
104 * the product name should be kept at 16 characters or less. If a device
105 * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
106 * normally generated by a device thorugh the INQUIRY response will be
107 * taken from this list, and this is the reason for the above size
108 * restriction. However, if the flag is not present, then you
109 * are free to use as many characters as you like.
112 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
113 vendor_name, product_name, use_protocol, use_transport, \
114 init_function, Flags) \
116 .vendorName = vendor_name, \
117 .productName = product_name, \
118 .useProtocol = use_protocol, \
119 .useTransport = use_transport, \
120 .initFunction = init_function, \
123 #define COMPLIANT_DEV UNUSUAL_DEV
125 #define USUAL_DEV(use_protocol, use_transport, use_type) \
127 .useProtocol = use_protocol, \
128 .useTransport = use_transport, \
131 static struct us_unusual_dev us_unusual_dev_list[] = {
132 # include "unusual_devs.h"
133 { } /* Terminating entry */
141 #ifdef CONFIG_PM /* Minimal support for suspend and resume */
143 int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
145 struct us_data *us = usb_get_intfdata(iface);
147 /* Wait until no command is running */
148 mutex_lock(&us->dev_mutex);
150 US_DEBUGP("%s\n", __func__);
151 if (us->suspend_resume_hook)
152 (us->suspend_resume_hook)(us, US_SUSPEND);
154 /* When runtime PM is working, we'll set a flag to indicate
155 * whether we should autoresume when a SCSI request arrives. */
157 mutex_unlock(&us->dev_mutex);
160 EXPORT_SYMBOL_GPL(usb_stor_suspend);
162 int usb_stor_resume(struct usb_interface *iface)
164 struct us_data *us = usb_get_intfdata(iface);
166 mutex_lock(&us->dev_mutex);
168 US_DEBUGP("%s\n", __func__);
169 if (us->suspend_resume_hook)
170 (us->suspend_resume_hook)(us, US_RESUME);
172 mutex_unlock(&us->dev_mutex);
175 EXPORT_SYMBOL_GPL(usb_stor_resume);
177 int usb_stor_reset_resume(struct usb_interface *iface)
179 struct us_data *us = usb_get_intfdata(iface);
181 US_DEBUGP("%s\n", __func__);
183 /* Report the reset to the SCSI core */
184 usb_stor_report_bus_reset(us);
186 /* FIXME: Notify the subdrivers that they need to reinitialize
190 EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
192 #endif /* CONFIG_PM */
195 * The next two routines get called just before and just after
196 * a USB port reset, whether from this driver or a different one.
199 int usb_stor_pre_reset(struct usb_interface *iface)
201 struct us_data *us = usb_get_intfdata(iface);
203 US_DEBUGP("%s\n", __func__);
205 /* Make sure no command runs during the reset */
206 mutex_lock(&us->dev_mutex);
209 EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
211 int usb_stor_post_reset(struct usb_interface *iface)
213 struct us_data *us = usb_get_intfdata(iface);
215 US_DEBUGP("%s\n", __func__);
217 /* Report the reset to the SCSI core */
218 usb_stor_report_bus_reset(us);
220 /* FIXME: Notify the subdrivers that they need to reinitialize
223 mutex_unlock(&us->dev_mutex);
226 EXPORT_SYMBOL_GPL(usb_stor_post_reset);
229 * fill_inquiry_response takes an unsigned char array (which must
230 * be at least 36 characters) and populates the vendor name,
231 * product name, and revision fields. Then the array is copied
232 * into the SCSI command's response buffer (oddly enough
233 * called request_buffer). data_len contains the length of the
234 * data array, which again must be at least 36.
237 void fill_inquiry_response(struct us_data *us, unsigned char *data,
238 unsigned int data_len)
240 if (data_len<36) // You lose.
243 if(data[0]&0x20) { /* USB device currently not connected. Return
244 peripheral qualifier 001b ("...however, the
245 physical device is not currently connected
246 to this logical unit") and leave vendor and
247 product identification empty. ("If the target
248 does store some of the INQUIRY data on the
249 device, it may return zeros or ASCII spaces
250 (20h) in those fields until the data is
251 available from the device."). */
254 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
255 memcpy(data+8, us->unusual_dev->vendorName,
256 strlen(us->unusual_dev->vendorName) > 8 ? 8 :
257 strlen(us->unusual_dev->vendorName));
258 memcpy(data+16, us->unusual_dev->productName,
259 strlen(us->unusual_dev->productName) > 16 ? 16 :
260 strlen(us->unusual_dev->productName));
261 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
262 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
263 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
264 data[35] = 0x30 + ((bcdDevice) & 0x0F);
267 usb_stor_set_xfer_buf(data, data_len, us->srb);
269 EXPORT_SYMBOL_GPL(fill_inquiry_response);
271 static int usb_stor_control_thread(void * __us)
273 struct us_data *us = (struct us_data *)__us;
274 struct Scsi_Host *host = us_to_host(us);
277 US_DEBUGP("*** thread sleeping.\n");
278 if (wait_for_completion_interruptible(&us->cmnd_ready))
281 US_DEBUGP("*** thread awakened.\n");
283 /* lock the device pointers */
284 mutex_lock(&(us->dev_mutex));
286 /* lock access to the state */
289 /* When we are called with no command pending, we're done */
290 if (us->srb == NULL) {
292 mutex_unlock(&us->dev_mutex);
293 US_DEBUGP("-- exiting\n");
297 /* has the command timed out *already* ? */
298 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
299 us->srb->result = DID_ABORT << 16;
305 /* reject the command if the direction indicator
308 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
309 US_DEBUGP("UNKNOWN data direction\n");
310 us->srb->result = DID_ERROR << 16;
313 /* reject if target != 0 or if LUN is higher than
314 * the maximum known LUN
316 else if (us->srb->device->id &&
317 !(us->fflags & US_FL_SCM_MULT_TARG)) {
318 US_DEBUGP("Bad target number (%d:%d)\n",
319 us->srb->device->id, us->srb->device->lun);
320 us->srb->result = DID_BAD_TARGET << 16;
323 else if (us->srb->device->lun > us->max_lun) {
324 US_DEBUGP("Bad LUN (%d:%d)\n",
325 us->srb->device->id, us->srb->device->lun);
326 us->srb->result = DID_BAD_TARGET << 16;
329 /* Handle those devices which need us to fake
330 * their inquiry data */
331 else if ((us->srb->cmnd[0] == INQUIRY) &&
332 (us->fflags & US_FL_FIX_INQUIRY)) {
333 unsigned char data_ptr[36] = {
334 0x00, 0x80, 0x02, 0x02,
335 0x1F, 0x00, 0x00, 0x00};
337 US_DEBUGP("Faking INQUIRY command\n");
338 fill_inquiry_response(us, data_ptr, 36);
339 us->srb->result = SAM_STAT_GOOD;
342 /* we've got a command, let's do it! */
344 US_DEBUG(usb_stor_show_command(us->srb));
345 us->proto_handler(us->srb, us);
348 /* lock access to the state */
351 /* indicate that the command is done */
352 if (us->srb->result != DID_ABORT << 16) {
353 US_DEBUGP("scsi cmd done, result=0x%x\n",
355 us->srb->scsi_done(us->srb);
358 US_DEBUGP("scsi command aborted\n");
361 /* If an abort request was received we need to signal that
362 * the abort has finished. The proper test for this is
363 * the TIMED_OUT flag, not srb->result == DID_ABORT, because
364 * the timeout might have occurred after the command had
365 * already completed with a different result code. */
366 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
367 complete(&(us->notify));
369 /* Allow USB transfers to resume */
370 clear_bit(US_FLIDX_ABORTING, &us->dflags);
371 clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
374 /* finished working on this command */
378 /* unlock the device pointers */
379 mutex_unlock(&us->dev_mutex);
382 /* Wait until we are told to stop */
384 set_current_state(TASK_INTERRUPTIBLE);
385 if (kthread_should_stop())
389 __set_current_state(TASK_RUNNING);
393 /***********************************************************************
394 * Device probing and disconnecting
395 ***********************************************************************/
397 /* Associate our private data with the USB device */
398 static int associate_dev(struct us_data *us, struct usb_interface *intf)
400 US_DEBUGP("-- %s\n", __func__);
402 /* Fill in the device-related fields */
403 us->pusb_dev = interface_to_usbdev(intf);
404 us->pusb_intf = intf;
405 us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
406 US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
407 le16_to_cpu(us->pusb_dev->descriptor.idVendor),
408 le16_to_cpu(us->pusb_dev->descriptor.idProduct),
409 le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
410 US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
411 intf->cur_altsetting->desc.bInterfaceSubClass,
412 intf->cur_altsetting->desc.bInterfaceProtocol);
414 /* Store our private data in the interface */
415 usb_set_intfdata(intf, us);
417 /* Allocate the device-related DMA-mapped buffers */
418 us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
419 GFP_KERNEL, &us->cr_dma);
421 US_DEBUGP("usb_ctrlrequest allocation failed\n");
425 us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE,
426 GFP_KERNEL, &us->iobuf_dma);
428 US_DEBUGP("I/O buffer allocation failed\n");
434 /* Works only for digits and letters, but small and fast */
435 #define TOLOWER(x) ((x) | 0x20)
437 /* Adjust device flags based on the "quirks=" module parameter */
438 static void adjust_quirks(struct us_data *us)
441 u16 vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor);
442 u16 pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct);
444 unsigned int mask = (US_FL_SANE_SENSE | US_FL_FIX_CAPACITY |
445 US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
446 US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
447 US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
448 US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT);
452 /* Each entry consists of VID:PID:flags */
453 if (vid == simple_strtoul(p, &p, 16) &&
455 pid == simple_strtoul(p+1, &p, 16) &&
459 /* Move forward to the next entry */
465 if (!*p) /* No match */
468 /* Collect the flags */
469 while (*++p && *p != ',') {
470 switch (TOLOWER(*p)) {
472 f |= US_FL_SANE_SENSE;
475 f |= US_FL_FIX_CAPACITY;
478 f |= US_FL_CAPACITY_HEURISTICS;
481 f |= US_FL_IGNORE_DEVICE;
484 f |= US_FL_NOT_LOCKABLE;
487 f |= US_FL_MAX_SECTORS_64;
490 f |= US_FL_CAPACITY_OK;
493 f |= US_FL_IGNORE_RESIDUE;
496 f |= US_FL_SINGLE_LUN;
499 f |= US_FL_NO_WP_DETECT;
501 /* Ignore unrecognized flag characters */
504 us->fflags = (us->fflags & ~mask) | f;
505 dev_info(&us->pusb_intf->dev, "Quirks match for "
506 "vid %04x pid %04x: %x\n",
510 /* Get the unusual_devs entries and the string descriptors */
511 static int get_device_info(struct us_data *us, const struct usb_device_id *id,
512 struct us_unusual_dev *unusual_dev)
514 struct usb_device *dev = us->pusb_dev;
515 struct usb_interface_descriptor *idesc =
516 &us->pusb_intf->cur_altsetting->desc;
518 /* Store the entries */
519 us->unusual_dev = unusual_dev;
520 us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ?
521 idesc->bInterfaceSubClass :
522 unusual_dev->useProtocol;
523 us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
524 idesc->bInterfaceProtocol :
525 unusual_dev->useTransport;
526 us->fflags = USB_US_ORIG_FLAGS(id->driver_info);
529 if (us->fflags & US_FL_IGNORE_DEVICE) {
530 printk(KERN_INFO USB_STORAGE "device ignored\n");
535 * This flag is only needed when we're in high-speed, so let's
536 * disable it if we're in full-speed
538 if (dev->speed != USB_SPEED_HIGH)
539 us->fflags &= ~US_FL_GO_SLOW;
541 /* Log a message if a non-generic unusual_dev entry contains an
542 * unnecessary subclass or protocol override. This may stimulate
543 * reports from users that will help us remove unneeded entries
544 * from the unusual_devs.h table.
546 if (id->idVendor || id->idProduct) {
547 static const char *msgs[3] = {
548 "an unneeded SubClass entry",
549 "an unneeded Protocol entry",
550 "unneeded SubClass and Protocol entries"};
551 struct usb_device_descriptor *ddesc = &dev->descriptor;
554 if (unusual_dev->useProtocol != US_SC_DEVICE &&
555 us->subclass == idesc->bInterfaceSubClass)
557 if (unusual_dev->useTransport != US_PR_DEVICE &&
558 us->protocol == idesc->bInterfaceProtocol)
560 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
561 printk(KERN_NOTICE USB_STORAGE "This device "
562 "(%04x,%04x,%04x S %02x P %02x)"
563 " has %s in unusual_devs.h (kernel"
565 " Please send a copy of this message to "
566 "<linux-usb@vger.kernel.org> and "
567 "<usb-storage@lists.one-eyed-alien.net>\n",
568 le16_to_cpu(ddesc->idVendor),
569 le16_to_cpu(ddesc->idProduct),
570 le16_to_cpu(ddesc->bcdDevice),
571 idesc->bInterfaceSubClass,
572 idesc->bInterfaceProtocol,
580 /* Get the transport settings */
581 static void get_transport(struct us_data *us)
583 switch (us->protocol) {
585 us->transport_name = "Control/Bulk";
586 us->transport = usb_stor_CB_transport;
587 us->transport_reset = usb_stor_CB_reset;
592 us->transport_name = "Control/Bulk/Interrupt";
593 us->transport = usb_stor_CB_transport;
594 us->transport_reset = usb_stor_CB_reset;
599 us->transport_name = "Bulk";
600 us->transport = usb_stor_Bulk_transport;
601 us->transport_reset = usb_stor_Bulk_reset;
604 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
606 us->transport_name = "Lexar Jumpshot Control/Bulk";
607 us->transport = jumpshot_transport;
608 us->transport_reset = usb_stor_Bulk_reset;
613 #ifdef CONFIG_USB_STORAGE_ALAUDA
615 us->transport_name = "Alauda Control/Bulk";
616 us->transport = alauda_transport;
617 us->transport_reset = usb_stor_Bulk_reset;
622 #ifdef CONFIG_USB_STORAGE_KARMA
624 us->transport_name = "Rio Karma/Bulk";
625 us->transport = rio_karma_transport;
626 us->transport_reset = usb_stor_Bulk_reset;
633 /* Get the protocol settings */
634 static void get_protocol(struct us_data *us)
636 switch (us->subclass) {
638 us->protocol_name = "Reduced Block Commands (RBC)";
639 us->proto_handler = usb_stor_transparent_scsi_command;
643 us->protocol_name = "8020i";
644 us->proto_handler = usb_stor_pad12_command;
649 us->protocol_name = "QIC-157";
650 us->proto_handler = usb_stor_pad12_command;
655 us->protocol_name = "8070i";
656 us->proto_handler = usb_stor_pad12_command;
661 us->protocol_name = "Transparent SCSI";
662 us->proto_handler = usb_stor_transparent_scsi_command;
666 us->protocol_name = "Uniform Floppy Interface (UFI)";
667 us->proto_handler = usb_stor_ufi_command;
672 /* Get the pipe settings */
673 static int get_pipes(struct us_data *us)
675 struct usb_host_interface *altsetting =
676 us->pusb_intf->cur_altsetting;
678 struct usb_endpoint_descriptor *ep;
679 struct usb_endpoint_descriptor *ep_in = NULL;
680 struct usb_endpoint_descriptor *ep_out = NULL;
681 struct usb_endpoint_descriptor *ep_int = NULL;
684 * Find the first endpoint of each type we need.
685 * We are expecting a minimum of 2 endpoints - in and out (bulk).
686 * An optional interrupt-in is OK (necessary for CBI protocol).
687 * We will ignore any others.
689 for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
690 ep = &altsetting->endpoint[i].desc;
692 if (usb_endpoint_xfer_bulk(ep)) {
693 if (usb_endpoint_dir_in(ep)) {
702 else if (usb_endpoint_is_int_in(ep)) {
708 if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) {
709 US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n");
713 /* Calculate and store the pipe values */
714 us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
715 us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
716 us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
717 usb_endpoint_num(ep_out));
718 us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
719 usb_endpoint_num(ep_in));
721 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
722 usb_endpoint_num(ep_int));
723 us->ep_bInterval = ep_int->bInterval;
728 /* Initialize all the dynamic resources we need */
729 static int usb_stor_acquire_resources(struct us_data *us)
732 struct task_struct *th;
734 us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
735 if (!us->current_urb) {
736 US_DEBUGP("URB allocation failed\n");
740 /* Just before we start our control thread, initialize
741 * the device if it needs initialization */
742 if (us->unusual_dev->initFunction) {
743 p = us->unusual_dev->initFunction(us);
748 /* Start up our control thread */
749 th = kthread_run(usb_stor_control_thread, us, "usb-storage");
751 printk(KERN_WARNING USB_STORAGE
752 "Unable to start control thread\n");
760 /* Release all our dynamic resources */
761 static void usb_stor_release_resources(struct us_data *us)
763 US_DEBUGP("-- %s\n", __func__);
765 /* Tell the control thread to exit. The SCSI host must
766 * already have been removed and the DISCONNECTING flag set
767 * so that we won't accept any more commands.
769 US_DEBUGP("-- sending exit command to thread\n");
770 complete(&us->cmnd_ready);
772 kthread_stop(us->ctl_thread);
774 /* Call the destructor routine, if it exists */
775 if (us->extra_destructor) {
776 US_DEBUGP("-- calling extra_destructor()\n");
777 us->extra_destructor(us->extra);
780 /* Free the extra data and the URB */
782 usb_free_urb(us->current_urb);
785 /* Dissociate from the USB device */
786 static void dissociate_dev(struct us_data *us)
788 US_DEBUGP("-- %s\n", __func__);
790 /* Free the device-related DMA-mapped buffers */
792 usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
795 usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
798 /* Remove our private data from the interface */
799 usb_set_intfdata(us->pusb_intf, NULL);
802 /* First stage of disconnect processing: stop SCSI scanning,
803 * remove the host, and stop accepting new commands
805 static void quiesce_and_remove_host(struct us_data *us)
807 struct Scsi_Host *host = us_to_host(us);
809 /* If the device is really gone, cut short reset delays */
810 if (us->pusb_dev->state == USB_STATE_NOTATTACHED)
811 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
813 /* Prevent SCSI-scanning (if it hasn't started yet)
814 * and wait for the SCSI-scanning thread to stop.
816 set_bit(US_FLIDX_DONT_SCAN, &us->dflags);
817 wake_up(&us->delay_wait);
818 wait_for_completion(&us->scanning_done);
820 /* Removing the host will perform an orderly shutdown: caches
821 * synchronized, disks spun down, etc.
823 scsi_remove_host(host);
825 /* Prevent any new commands from being accepted and cut short
829 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
831 wake_up(&us->delay_wait);
834 /* Second stage of disconnect processing: deallocate all resources */
835 static void release_everything(struct us_data *us)
837 usb_stor_release_resources(us);
840 /* Drop our reference to the host; the SCSI core will free it
841 * (and "us" along with it) when the refcount becomes 0. */
842 scsi_host_put(us_to_host(us));
845 /* Thread to carry out delayed SCSI-device scanning */
846 static int usb_stor_scan_thread(void * __us)
848 struct us_data *us = (struct us_data *)__us;
851 "usb-storage: device found at %d\n", us->pusb_dev->devnum);
854 /* Wait for the timeout to expire or for a disconnect */
856 printk(KERN_DEBUG "usb-storage: waiting for device "
857 "to settle before scanning\n");
858 wait_event_freezable_timeout(us->delay_wait,
859 test_bit(US_FLIDX_DONT_SCAN, &us->dflags),
863 /* If the device is still connected, perform the scanning */
864 if (!test_bit(US_FLIDX_DONT_SCAN, &us->dflags)) {
866 /* For bulk-only devices, determine the max LUN value */
867 if (us->protocol == US_PR_BULK &&
868 !(us->fflags & US_FL_SINGLE_LUN)) {
869 mutex_lock(&us->dev_mutex);
870 us->max_lun = usb_stor_Bulk_max_lun(us);
871 mutex_unlock(&us->dev_mutex);
873 scsi_scan_host(us_to_host(us));
874 printk(KERN_DEBUG "usb-storage: device scan complete\n");
876 /* Should we unbind if no devices were detected? */
879 complete_and_exit(&us->scanning_done, 0);
883 /* First part of general USB mass-storage probing */
884 int usb_stor_probe1(struct us_data **pus,
885 struct usb_interface *intf,
886 const struct usb_device_id *id,
887 struct us_unusual_dev *unusual_dev)
889 struct Scsi_Host *host;
893 US_DEBUGP("USB Mass Storage device detected\n");
896 * Ask the SCSI layer to allocate a host structure, with extra
897 * space at the end for our private us_data structure.
899 host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
901 printk(KERN_WARNING USB_STORAGE
902 "Unable to allocate the scsi host\n");
907 * Allow 16-byte CDBs and thus > 2TB
909 host->max_cmd_len = 16;
910 *pus = us = host_to_us(host);
911 memset(us, 0, sizeof(struct us_data));
912 mutex_init(&(us->dev_mutex));
913 init_completion(&us->cmnd_ready);
914 init_completion(&(us->notify));
915 init_waitqueue_head(&us->delay_wait);
916 init_completion(&us->scanning_done);
918 /* Associate the us_data structure with the USB device */
919 result = associate_dev(us, intf);
923 /* Get the unusual_devs entries and the descriptors */
924 result = get_device_info(us, id, unusual_dev);
928 /* Get standard transport and protocol settings */
932 /* Give the caller a chance to fill in specialized transport
933 * or protocol settings.
938 US_DEBUGP("storage_probe() failed\n");
939 release_everything(us);
942 EXPORT_SYMBOL_GPL(usb_stor_probe1);
944 /* Second part of general USB mass-storage probing */
945 int usb_stor_probe2(struct us_data *us)
947 struct task_struct *th;
950 /* Make sure the transport and protocol have both been set */
951 if (!us->transport || !us->proto_handler) {
955 US_DEBUGP("Transport: %s\n", us->transport_name);
956 US_DEBUGP("Protocol: %s\n", us->protocol_name);
958 /* fix for single-lun devices */
959 if (us->fflags & US_FL_SINGLE_LUN)
962 /* Find the endpoints and calculate pipe values */
963 result = get_pipes(us);
967 /* Acquire all the other resources and add the host */
968 result = usb_stor_acquire_resources(us);
971 result = scsi_add_host(us_to_host(us), &us->pusb_intf->dev);
973 printk(KERN_WARNING USB_STORAGE
974 "Unable to add the scsi host\n");
978 /* Start up the thread for delayed SCSI-device scanning */
979 th = kthread_create(usb_stor_scan_thread, us, "usb-stor-scan");
981 printk(KERN_WARNING USB_STORAGE
982 "Unable to start the device-scanning thread\n");
983 complete(&us->scanning_done);
984 quiesce_and_remove_host(us);
985 result = PTR_ERR(th);
993 /* We come here if there are any problems */
995 US_DEBUGP("storage_probe() failed\n");
996 release_everything(us);
999 EXPORT_SYMBOL_GPL(usb_stor_probe2);
1001 /* Handle a USB mass-storage disconnect */
1002 void usb_stor_disconnect(struct usb_interface *intf)
1004 struct us_data *us = usb_get_intfdata(intf);
1006 US_DEBUGP("storage_disconnect() called\n");
1007 quiesce_and_remove_host(us);
1008 release_everything(us);
1010 EXPORT_SYMBOL_GPL(usb_stor_disconnect);
1012 /* The main probe routine for standard devices */
1013 static int storage_probe(struct usb_interface *intf,
1014 const struct usb_device_id *id)
1020 * If libusual is configured, let it decide whether a standard
1021 * device should be handled by usb-storage or by ub.
1022 * If the device isn't standard (is handled by a subdriver
1023 * module) then don't accept it.
1025 if (usb_usual_check_type(id, USB_US_TYPE_STOR) ||
1026 usb_usual_ignore_device(intf))
1030 * Call the general probe procedures.
1032 * The unusual_dev_list array is parallel to the usb_storage_usb_ids
1033 * table, so we use the index of the id entry to find the
1034 * corresponding unusual_devs entry.
1036 result = usb_stor_probe1(&us, intf, id,
1037 (id - usb_storage_usb_ids) + us_unusual_dev_list);
1041 /* No special transport or protocol settings in the main module */
1043 result = usb_stor_probe2(us);
1047 /***********************************************************************
1048 * Initialization and registration
1049 ***********************************************************************/
1051 static struct usb_driver usb_storage_driver = {
1052 .name = "usb-storage",
1053 .probe = storage_probe,
1054 .disconnect = usb_stor_disconnect,
1055 .suspend = usb_stor_suspend,
1056 .resume = usb_stor_resume,
1057 .reset_resume = usb_stor_reset_resume,
1058 .pre_reset = usb_stor_pre_reset,
1059 .post_reset = usb_stor_post_reset,
1060 .id_table = usb_storage_usb_ids,
1064 static int __init usb_stor_init(void)
1068 printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
1070 /* register the driver, return usb_register return code if error */
1071 retval = usb_register(&usb_storage_driver);
1073 printk(KERN_INFO "USB Mass Storage support registered.\n");
1074 usb_usual_set_present(USB_US_TYPE_STOR);
1079 static void __exit usb_stor_exit(void)
1081 US_DEBUGP("usb_stor_exit() called\n");
1083 /* Deregister the driver
1084 * This will cause disconnect() to be called for each
1087 US_DEBUGP("-- calling usb_deregister()\n");
1088 usb_deregister(&usb_storage_driver) ;
1090 usb_usual_clear_present(USB_US_TYPE_STOR);
1093 module_init(usb_stor_init);
1094 module_exit(usb_stor_exit);