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_DATAFAB
72 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
75 #ifdef CONFIG_USB_STORAGE_ONETOUCH
78 #ifdef CONFIG_USB_STORAGE_ALAUDA
81 #ifdef CONFIG_USB_STORAGE_KARMA
84 #include "sierra_ms.h"
85 #include "option_ms.h"
87 /* Some informational data */
88 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
89 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
90 MODULE_LICENSE("GPL");
92 static unsigned int delay_use = 5;
93 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
94 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
96 static char quirks[128];
97 module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
98 MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
102 * The entries in this table correspond, line for line,
103 * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
106 /* The vendor name should be kept at eight characters or less, and
107 * the product name should be kept at 16 characters or less. If a device
108 * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
109 * normally generated by a device thorugh the INQUIRY response will be
110 * taken from this list, and this is the reason for the above size
111 * restriction. However, if the flag is not present, then you
112 * are free to use as many characters as you like.
115 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
116 vendor_name, product_name, use_protocol, use_transport, \
117 init_function, Flags) \
119 .vendorName = vendor_name, \
120 .productName = product_name, \
121 .useProtocol = use_protocol, \
122 .useTransport = use_transport, \
123 .initFunction = init_function, \
126 #define COMPLIANT_DEV UNUSUAL_DEV
128 #define USUAL_DEV(use_protocol, use_transport, use_type) \
130 .useProtocol = use_protocol, \
131 .useTransport = use_transport, \
134 static struct us_unusual_dev us_unusual_dev_list[] = {
135 # include "unusual_devs.h"
136 { } /* Terminating entry */
144 #ifdef CONFIG_PM /* Minimal support for suspend and resume */
146 int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
148 struct us_data *us = usb_get_intfdata(iface);
150 /* Wait until no command is running */
151 mutex_lock(&us->dev_mutex);
153 US_DEBUGP("%s\n", __func__);
154 if (us->suspend_resume_hook)
155 (us->suspend_resume_hook)(us, US_SUSPEND);
157 /* When runtime PM is working, we'll set a flag to indicate
158 * whether we should autoresume when a SCSI request arrives. */
160 mutex_unlock(&us->dev_mutex);
163 EXPORT_SYMBOL_GPL(usb_stor_suspend);
165 int usb_stor_resume(struct usb_interface *iface)
167 struct us_data *us = usb_get_intfdata(iface);
169 mutex_lock(&us->dev_mutex);
171 US_DEBUGP("%s\n", __func__);
172 if (us->suspend_resume_hook)
173 (us->suspend_resume_hook)(us, US_RESUME);
175 mutex_unlock(&us->dev_mutex);
178 EXPORT_SYMBOL_GPL(usb_stor_resume);
180 int usb_stor_reset_resume(struct usb_interface *iface)
182 struct us_data *us = usb_get_intfdata(iface);
184 US_DEBUGP("%s\n", __func__);
186 /* Report the reset to the SCSI core */
187 usb_stor_report_bus_reset(us);
189 /* FIXME: Notify the subdrivers that they need to reinitialize
193 EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
195 #endif /* CONFIG_PM */
198 * The next two routines get called just before and just after
199 * a USB port reset, whether from this driver or a different one.
202 int usb_stor_pre_reset(struct usb_interface *iface)
204 struct us_data *us = usb_get_intfdata(iface);
206 US_DEBUGP("%s\n", __func__);
208 /* Make sure no command runs during the reset */
209 mutex_lock(&us->dev_mutex);
212 EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
214 int usb_stor_post_reset(struct usb_interface *iface)
216 struct us_data *us = usb_get_intfdata(iface);
218 US_DEBUGP("%s\n", __func__);
220 /* Report the reset to the SCSI core */
221 usb_stor_report_bus_reset(us);
223 /* FIXME: Notify the subdrivers that they need to reinitialize
226 mutex_unlock(&us->dev_mutex);
229 EXPORT_SYMBOL_GPL(usb_stor_post_reset);
232 * fill_inquiry_response takes an unsigned char array (which must
233 * be at least 36 characters) and populates the vendor name,
234 * product name, and revision fields. Then the array is copied
235 * into the SCSI command's response buffer (oddly enough
236 * called request_buffer). data_len contains the length of the
237 * data array, which again must be at least 36.
240 void fill_inquiry_response(struct us_data *us, unsigned char *data,
241 unsigned int data_len)
243 if (data_len<36) // You lose.
246 if(data[0]&0x20) { /* USB device currently not connected. Return
247 peripheral qualifier 001b ("...however, the
248 physical device is not currently connected
249 to this logical unit") and leave vendor and
250 product identification empty. ("If the target
251 does store some of the INQUIRY data on the
252 device, it may return zeros or ASCII spaces
253 (20h) in those fields until the data is
254 available from the device."). */
257 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
258 memcpy(data+8, us->unusual_dev->vendorName,
259 strlen(us->unusual_dev->vendorName) > 8 ? 8 :
260 strlen(us->unusual_dev->vendorName));
261 memcpy(data+16, us->unusual_dev->productName,
262 strlen(us->unusual_dev->productName) > 16 ? 16 :
263 strlen(us->unusual_dev->productName));
264 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
265 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
266 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
267 data[35] = 0x30 + ((bcdDevice) & 0x0F);
270 usb_stor_set_xfer_buf(data, data_len, us->srb);
272 EXPORT_SYMBOL_GPL(fill_inquiry_response);
274 static int usb_stor_control_thread(void * __us)
276 struct us_data *us = (struct us_data *)__us;
277 struct Scsi_Host *host = us_to_host(us);
280 US_DEBUGP("*** thread sleeping.\n");
281 if (wait_for_completion_interruptible(&us->cmnd_ready))
284 US_DEBUGP("*** thread awakened.\n");
286 /* lock the device pointers */
287 mutex_lock(&(us->dev_mutex));
289 /* lock access to the state */
292 /* When we are called with no command pending, we're done */
293 if (us->srb == NULL) {
295 mutex_unlock(&us->dev_mutex);
296 US_DEBUGP("-- exiting\n");
300 /* has the command timed out *already* ? */
301 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
302 us->srb->result = DID_ABORT << 16;
308 /* reject the command if the direction indicator
311 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
312 US_DEBUGP("UNKNOWN data direction\n");
313 us->srb->result = DID_ERROR << 16;
316 /* reject if target != 0 or if LUN is higher than
317 * the maximum known LUN
319 else if (us->srb->device->id &&
320 !(us->fflags & US_FL_SCM_MULT_TARG)) {
321 US_DEBUGP("Bad target number (%d:%d)\n",
322 us->srb->device->id, us->srb->device->lun);
323 us->srb->result = DID_BAD_TARGET << 16;
326 else if (us->srb->device->lun > us->max_lun) {
327 US_DEBUGP("Bad LUN (%d:%d)\n",
328 us->srb->device->id, us->srb->device->lun);
329 us->srb->result = DID_BAD_TARGET << 16;
332 /* Handle those devices which need us to fake
333 * their inquiry data */
334 else if ((us->srb->cmnd[0] == INQUIRY) &&
335 (us->fflags & US_FL_FIX_INQUIRY)) {
336 unsigned char data_ptr[36] = {
337 0x00, 0x80, 0x02, 0x02,
338 0x1F, 0x00, 0x00, 0x00};
340 US_DEBUGP("Faking INQUIRY command\n");
341 fill_inquiry_response(us, data_ptr, 36);
342 us->srb->result = SAM_STAT_GOOD;
345 /* we've got a command, let's do it! */
347 US_DEBUG(usb_stor_show_command(us->srb));
348 us->proto_handler(us->srb, us);
351 /* lock access to the state */
354 /* indicate that the command is done */
355 if (us->srb->result != DID_ABORT << 16) {
356 US_DEBUGP("scsi cmd done, result=0x%x\n",
358 us->srb->scsi_done(us->srb);
361 US_DEBUGP("scsi command aborted\n");
364 /* If an abort request was received we need to signal that
365 * the abort has finished. The proper test for this is
366 * the TIMED_OUT flag, not srb->result == DID_ABORT, because
367 * the timeout might have occurred after the command had
368 * already completed with a different result code. */
369 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
370 complete(&(us->notify));
372 /* Allow USB transfers to resume */
373 clear_bit(US_FLIDX_ABORTING, &us->dflags);
374 clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
377 /* finished working on this command */
381 /* unlock the device pointers */
382 mutex_unlock(&us->dev_mutex);
385 /* Wait until we are told to stop */
387 set_current_state(TASK_INTERRUPTIBLE);
388 if (kthread_should_stop())
392 __set_current_state(TASK_RUNNING);
396 /***********************************************************************
397 * Device probing and disconnecting
398 ***********************************************************************/
400 /* Associate our private data with the USB device */
401 static int associate_dev(struct us_data *us, struct usb_interface *intf)
403 US_DEBUGP("-- %s\n", __func__);
405 /* Fill in the device-related fields */
406 us->pusb_dev = interface_to_usbdev(intf);
407 us->pusb_intf = intf;
408 us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
409 US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
410 le16_to_cpu(us->pusb_dev->descriptor.idVendor),
411 le16_to_cpu(us->pusb_dev->descriptor.idProduct),
412 le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
413 US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
414 intf->cur_altsetting->desc.bInterfaceSubClass,
415 intf->cur_altsetting->desc.bInterfaceProtocol);
417 /* Store our private data in the interface */
418 usb_set_intfdata(intf, us);
420 /* Allocate the device-related DMA-mapped buffers */
421 us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
422 GFP_KERNEL, &us->cr_dma);
424 US_DEBUGP("usb_ctrlrequest allocation failed\n");
428 us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE,
429 GFP_KERNEL, &us->iobuf_dma);
431 US_DEBUGP("I/O buffer allocation failed\n");
437 /* Works only for digits and letters, but small and fast */
438 #define TOLOWER(x) ((x) | 0x20)
440 /* Adjust device flags based on the "quirks=" module parameter */
441 static void adjust_quirks(struct us_data *us)
444 u16 vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor);
445 u16 pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct);
447 unsigned int mask = (US_FL_SANE_SENSE | US_FL_FIX_CAPACITY |
448 US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
449 US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
450 US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
451 US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT);
455 /* Each entry consists of VID:PID:flags */
456 if (vid == simple_strtoul(p, &p, 16) &&
458 pid == simple_strtoul(p+1, &p, 16) &&
462 /* Move forward to the next entry */
468 if (!*p) /* No match */
471 /* Collect the flags */
472 while (*++p && *p != ',') {
473 switch (TOLOWER(*p)) {
475 f |= US_FL_SANE_SENSE;
478 f |= US_FL_FIX_CAPACITY;
481 f |= US_FL_CAPACITY_HEURISTICS;
484 f |= US_FL_IGNORE_DEVICE;
487 f |= US_FL_NOT_LOCKABLE;
490 f |= US_FL_MAX_SECTORS_64;
493 f |= US_FL_CAPACITY_OK;
496 f |= US_FL_IGNORE_RESIDUE;
499 f |= US_FL_SINGLE_LUN;
502 f |= US_FL_NO_WP_DETECT;
504 /* Ignore unrecognized flag characters */
507 us->fflags = (us->fflags & ~mask) | f;
508 dev_info(&us->pusb_intf->dev, "Quirks match for "
509 "vid %04x pid %04x: %x\n",
513 /* Get the unusual_devs entries and the string descriptors */
514 static int get_device_info(struct us_data *us, const struct usb_device_id *id,
515 struct us_unusual_dev *unusual_dev)
517 struct usb_device *dev = us->pusb_dev;
518 struct usb_interface_descriptor *idesc =
519 &us->pusb_intf->cur_altsetting->desc;
521 /* Store the entries */
522 us->unusual_dev = unusual_dev;
523 us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ?
524 idesc->bInterfaceSubClass :
525 unusual_dev->useProtocol;
526 us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
527 idesc->bInterfaceProtocol :
528 unusual_dev->useTransport;
529 us->fflags = USB_US_ORIG_FLAGS(id->driver_info);
532 if (us->fflags & US_FL_IGNORE_DEVICE) {
533 printk(KERN_INFO USB_STORAGE "device ignored\n");
538 * This flag is only needed when we're in high-speed, so let's
539 * disable it if we're in full-speed
541 if (dev->speed != USB_SPEED_HIGH)
542 us->fflags &= ~US_FL_GO_SLOW;
544 /* Log a message if a non-generic unusual_dev entry contains an
545 * unnecessary subclass or protocol override. This may stimulate
546 * reports from users that will help us remove unneeded entries
547 * from the unusual_devs.h table.
549 if (id->idVendor || id->idProduct) {
550 static const char *msgs[3] = {
551 "an unneeded SubClass entry",
552 "an unneeded Protocol entry",
553 "unneeded SubClass and Protocol entries"};
554 struct usb_device_descriptor *ddesc = &dev->descriptor;
557 if (unusual_dev->useProtocol != US_SC_DEVICE &&
558 us->subclass == idesc->bInterfaceSubClass)
560 if (unusual_dev->useTransport != US_PR_DEVICE &&
561 us->protocol == idesc->bInterfaceProtocol)
563 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
564 printk(KERN_NOTICE USB_STORAGE "This device "
565 "(%04x,%04x,%04x S %02x P %02x)"
566 " has %s in unusual_devs.h (kernel"
568 " Please send a copy of this message to "
569 "<linux-usb@vger.kernel.org> and "
570 "<usb-storage@lists.one-eyed-alien.net>\n",
571 le16_to_cpu(ddesc->idVendor),
572 le16_to_cpu(ddesc->idProduct),
573 le16_to_cpu(ddesc->bcdDevice),
574 idesc->bInterfaceSubClass,
575 idesc->bInterfaceProtocol,
583 /* Get the transport settings */
584 static void get_transport(struct us_data *us)
586 switch (us->protocol) {
588 us->transport_name = "Control/Bulk";
589 us->transport = usb_stor_CB_transport;
590 us->transport_reset = usb_stor_CB_reset;
595 us->transport_name = "Control/Bulk/Interrupt";
596 us->transport = usb_stor_CB_transport;
597 us->transport_reset = usb_stor_CB_reset;
602 us->transport_name = "Bulk";
603 us->transport = usb_stor_Bulk_transport;
604 us->transport_reset = usb_stor_Bulk_reset;
607 #ifdef CONFIG_USB_STORAGE_DATAFAB
609 us->transport_name = "Datafab Bulk-Only";
610 us->transport = datafab_transport;
611 us->transport_reset = usb_stor_Bulk_reset;
616 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
618 us->transport_name = "Lexar Jumpshot Control/Bulk";
619 us->transport = jumpshot_transport;
620 us->transport_reset = usb_stor_Bulk_reset;
625 #ifdef CONFIG_USB_STORAGE_ALAUDA
627 us->transport_name = "Alauda Control/Bulk";
628 us->transport = alauda_transport;
629 us->transport_reset = usb_stor_Bulk_reset;
634 #ifdef CONFIG_USB_STORAGE_KARMA
636 us->transport_name = "Rio Karma/Bulk";
637 us->transport = rio_karma_transport;
638 us->transport_reset = usb_stor_Bulk_reset;
645 /* Get the protocol settings */
646 static void get_protocol(struct us_data *us)
648 switch (us->subclass) {
650 us->protocol_name = "Reduced Block Commands (RBC)";
651 us->proto_handler = usb_stor_transparent_scsi_command;
655 us->protocol_name = "8020i";
656 us->proto_handler = usb_stor_pad12_command;
661 us->protocol_name = "QIC-157";
662 us->proto_handler = usb_stor_pad12_command;
667 us->protocol_name = "8070i";
668 us->proto_handler = usb_stor_pad12_command;
673 us->protocol_name = "Transparent SCSI";
674 us->proto_handler = usb_stor_transparent_scsi_command;
678 us->protocol_name = "Uniform Floppy Interface (UFI)";
679 us->proto_handler = usb_stor_ufi_command;
684 /* Get the pipe settings */
685 static int get_pipes(struct us_data *us)
687 struct usb_host_interface *altsetting =
688 us->pusb_intf->cur_altsetting;
690 struct usb_endpoint_descriptor *ep;
691 struct usb_endpoint_descriptor *ep_in = NULL;
692 struct usb_endpoint_descriptor *ep_out = NULL;
693 struct usb_endpoint_descriptor *ep_int = NULL;
696 * Find the first endpoint of each type we need.
697 * We are expecting a minimum of 2 endpoints - in and out (bulk).
698 * An optional interrupt-in is OK (necessary for CBI protocol).
699 * We will ignore any others.
701 for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
702 ep = &altsetting->endpoint[i].desc;
704 if (usb_endpoint_xfer_bulk(ep)) {
705 if (usb_endpoint_dir_in(ep)) {
714 else if (usb_endpoint_is_int_in(ep)) {
720 if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) {
721 US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n");
725 /* Calculate and store the pipe values */
726 us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
727 us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
728 us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
729 usb_endpoint_num(ep_out));
730 us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
731 usb_endpoint_num(ep_in));
733 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
734 usb_endpoint_num(ep_int));
735 us->ep_bInterval = ep_int->bInterval;
740 /* Initialize all the dynamic resources we need */
741 static int usb_stor_acquire_resources(struct us_data *us)
744 struct task_struct *th;
746 us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
747 if (!us->current_urb) {
748 US_DEBUGP("URB allocation failed\n");
752 /* Just before we start our control thread, initialize
753 * the device if it needs initialization */
754 if (us->unusual_dev->initFunction) {
755 p = us->unusual_dev->initFunction(us);
760 /* Start up our control thread */
761 th = kthread_run(usb_stor_control_thread, us, "usb-storage");
763 printk(KERN_WARNING USB_STORAGE
764 "Unable to start control thread\n");
772 /* Release all our dynamic resources */
773 static void usb_stor_release_resources(struct us_data *us)
775 US_DEBUGP("-- %s\n", __func__);
777 /* Tell the control thread to exit. The SCSI host must
778 * already have been removed and the DISCONNECTING flag set
779 * so that we won't accept any more commands.
781 US_DEBUGP("-- sending exit command to thread\n");
782 complete(&us->cmnd_ready);
784 kthread_stop(us->ctl_thread);
786 /* Call the destructor routine, if it exists */
787 if (us->extra_destructor) {
788 US_DEBUGP("-- calling extra_destructor()\n");
789 us->extra_destructor(us->extra);
792 /* Free the extra data and the URB */
794 usb_free_urb(us->current_urb);
797 /* Dissociate from the USB device */
798 static void dissociate_dev(struct us_data *us)
800 US_DEBUGP("-- %s\n", __func__);
802 /* Free the device-related DMA-mapped buffers */
804 usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
807 usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
810 /* Remove our private data from the interface */
811 usb_set_intfdata(us->pusb_intf, NULL);
814 /* First stage of disconnect processing: stop SCSI scanning,
815 * remove the host, and stop accepting new commands
817 static void quiesce_and_remove_host(struct us_data *us)
819 struct Scsi_Host *host = us_to_host(us);
821 /* If the device is really gone, cut short reset delays */
822 if (us->pusb_dev->state == USB_STATE_NOTATTACHED)
823 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
825 /* Prevent SCSI-scanning (if it hasn't started yet)
826 * and wait for the SCSI-scanning thread to stop.
828 set_bit(US_FLIDX_DONT_SCAN, &us->dflags);
829 wake_up(&us->delay_wait);
830 wait_for_completion(&us->scanning_done);
832 /* Removing the host will perform an orderly shutdown: caches
833 * synchronized, disks spun down, etc.
835 scsi_remove_host(host);
837 /* Prevent any new commands from being accepted and cut short
841 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
843 wake_up(&us->delay_wait);
846 /* Second stage of disconnect processing: deallocate all resources */
847 static void release_everything(struct us_data *us)
849 usb_stor_release_resources(us);
852 /* Drop our reference to the host; the SCSI core will free it
853 * (and "us" along with it) when the refcount becomes 0. */
854 scsi_host_put(us_to_host(us));
857 /* Thread to carry out delayed SCSI-device scanning */
858 static int usb_stor_scan_thread(void * __us)
860 struct us_data *us = (struct us_data *)__us;
863 "usb-storage: device found at %d\n", us->pusb_dev->devnum);
866 /* Wait for the timeout to expire or for a disconnect */
868 printk(KERN_DEBUG "usb-storage: waiting for device "
869 "to settle before scanning\n");
870 wait_event_freezable_timeout(us->delay_wait,
871 test_bit(US_FLIDX_DONT_SCAN, &us->dflags),
875 /* If the device is still connected, perform the scanning */
876 if (!test_bit(US_FLIDX_DONT_SCAN, &us->dflags)) {
878 /* For bulk-only devices, determine the max LUN value */
879 if (us->protocol == US_PR_BULK &&
880 !(us->fflags & US_FL_SINGLE_LUN)) {
881 mutex_lock(&us->dev_mutex);
882 us->max_lun = usb_stor_Bulk_max_lun(us);
883 mutex_unlock(&us->dev_mutex);
885 scsi_scan_host(us_to_host(us));
886 printk(KERN_DEBUG "usb-storage: device scan complete\n");
888 /* Should we unbind if no devices were detected? */
891 complete_and_exit(&us->scanning_done, 0);
895 /* First part of general USB mass-storage probing */
896 int usb_stor_probe1(struct us_data **pus,
897 struct usb_interface *intf,
898 const struct usb_device_id *id,
899 struct us_unusual_dev *unusual_dev)
901 struct Scsi_Host *host;
905 US_DEBUGP("USB Mass Storage device detected\n");
908 * Ask the SCSI layer to allocate a host structure, with extra
909 * space at the end for our private us_data structure.
911 host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
913 printk(KERN_WARNING USB_STORAGE
914 "Unable to allocate the scsi host\n");
919 * Allow 16-byte CDBs and thus > 2TB
921 host->max_cmd_len = 16;
922 *pus = us = host_to_us(host);
923 memset(us, 0, sizeof(struct us_data));
924 mutex_init(&(us->dev_mutex));
925 init_completion(&us->cmnd_ready);
926 init_completion(&(us->notify));
927 init_waitqueue_head(&us->delay_wait);
928 init_completion(&us->scanning_done);
930 /* Associate the us_data structure with the USB device */
931 result = associate_dev(us, intf);
935 /* Get the unusual_devs entries and the descriptors */
936 result = get_device_info(us, id, unusual_dev);
940 /* Get standard transport and protocol settings */
944 /* Give the caller a chance to fill in specialized transport
945 * or protocol settings.
950 US_DEBUGP("storage_probe() failed\n");
951 release_everything(us);
954 EXPORT_SYMBOL_GPL(usb_stor_probe1);
956 /* Second part of general USB mass-storage probing */
957 int usb_stor_probe2(struct us_data *us)
959 struct task_struct *th;
962 /* Make sure the transport and protocol have both been set */
963 if (!us->transport || !us->proto_handler) {
967 US_DEBUGP("Transport: %s\n", us->transport_name);
968 US_DEBUGP("Protocol: %s\n", us->protocol_name);
970 /* fix for single-lun devices */
971 if (us->fflags & US_FL_SINGLE_LUN)
974 /* Find the endpoints and calculate pipe values */
975 result = get_pipes(us);
979 /* Acquire all the other resources and add the host */
980 result = usb_stor_acquire_resources(us);
983 result = scsi_add_host(us_to_host(us), &us->pusb_intf->dev);
985 printk(KERN_WARNING USB_STORAGE
986 "Unable to add the scsi host\n");
990 /* Start up the thread for delayed SCSI-device scanning */
991 th = kthread_create(usb_stor_scan_thread, us, "usb-stor-scan");
993 printk(KERN_WARNING USB_STORAGE
994 "Unable to start the device-scanning thread\n");
995 complete(&us->scanning_done);
996 quiesce_and_remove_host(us);
997 result = PTR_ERR(th);
1001 wake_up_process(th);
1005 /* We come here if there are any problems */
1007 US_DEBUGP("storage_probe() failed\n");
1008 release_everything(us);
1011 EXPORT_SYMBOL_GPL(usb_stor_probe2);
1013 /* Handle a USB mass-storage disconnect */
1014 void usb_stor_disconnect(struct usb_interface *intf)
1016 struct us_data *us = usb_get_intfdata(intf);
1018 US_DEBUGP("storage_disconnect() called\n");
1019 quiesce_and_remove_host(us);
1020 release_everything(us);
1022 EXPORT_SYMBOL_GPL(usb_stor_disconnect);
1024 /* The main probe routine for standard devices */
1025 static int storage_probe(struct usb_interface *intf,
1026 const struct usb_device_id *id)
1032 * If libusual is configured, let it decide whether a standard
1033 * device should be handled by usb-storage or by ub.
1034 * If the device isn't standard (is handled by a subdriver
1035 * module) then don't accept it.
1037 if (usb_usual_check_type(id, USB_US_TYPE_STOR) ||
1038 usb_usual_ignore_device(intf))
1042 * Call the general probe procedures.
1044 * The unusual_dev_list array is parallel to the usb_storage_usb_ids
1045 * table, so we use the index of the id entry to find the
1046 * corresponding unusual_devs entry.
1048 result = usb_stor_probe1(&us, intf, id,
1049 (id - usb_storage_usb_ids) + us_unusual_dev_list);
1053 /* No special transport or protocol settings in the main module */
1055 result = usb_stor_probe2(us);
1059 /***********************************************************************
1060 * Initialization and registration
1061 ***********************************************************************/
1063 static struct usb_driver usb_storage_driver = {
1064 .name = "usb-storage",
1065 .probe = storage_probe,
1066 .disconnect = usb_stor_disconnect,
1067 .suspend = usb_stor_suspend,
1068 .resume = usb_stor_resume,
1069 .reset_resume = usb_stor_reset_resume,
1070 .pre_reset = usb_stor_pre_reset,
1071 .post_reset = usb_stor_post_reset,
1072 .id_table = usb_storage_usb_ids,
1076 static int __init usb_stor_init(void)
1080 printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
1082 /* register the driver, return usb_register return code if error */
1083 retval = usb_register(&usb_storage_driver);
1085 printk(KERN_INFO "USB Mass Storage support registered.\n");
1086 usb_usual_set_present(USB_US_TYPE_STOR);
1091 static void __exit usb_stor_exit(void)
1093 US_DEBUGP("usb_stor_exit() called\n");
1095 /* Deregister the driver
1096 * This will cause disconnect() to be called for each
1099 US_DEBUGP("-- calling usb_deregister()\n");
1100 usb_deregister(&usb_storage_driver) ;
1102 usb_usual_clear_present(USB_US_TYPE_STOR);
1105 module_init(usb_stor_init);
1106 module_exit(usb_stor_exit);