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_ONETOUCH
72 #include "sierra_ms.h"
73 #include "option_ms.h"
75 /* Some informational data */
76 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
77 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
78 MODULE_LICENSE("GPL");
80 static unsigned int delay_use = 5;
81 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
82 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
84 static char quirks[128];
85 module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
86 MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
90 * The entries in this table correspond, line for line,
91 * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
94 /* The vendor name should be kept at eight characters or less, and
95 * the product name should be kept at 16 characters or less. If a device
96 * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
97 * normally generated by a device thorugh the INQUIRY response will be
98 * taken from this list, and this is the reason for the above size
99 * restriction. However, if the flag is not present, then you
100 * are free to use as many characters as you like.
103 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
104 vendor_name, product_name, use_protocol, use_transport, \
105 init_function, Flags) \
107 .vendorName = vendor_name, \
108 .productName = product_name, \
109 .useProtocol = use_protocol, \
110 .useTransport = use_transport, \
111 .initFunction = init_function, \
114 #define COMPLIANT_DEV UNUSUAL_DEV
116 #define USUAL_DEV(use_protocol, use_transport, use_type) \
118 .useProtocol = use_protocol, \
119 .useTransport = use_transport, \
122 static struct us_unusual_dev us_unusual_dev_list[] = {
123 # include "unusual_devs.h"
124 { } /* Terminating entry */
132 #ifdef CONFIG_PM /* Minimal support for suspend and resume */
134 int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
136 struct us_data *us = usb_get_intfdata(iface);
138 /* Wait until no command is running */
139 mutex_lock(&us->dev_mutex);
141 US_DEBUGP("%s\n", __func__);
142 if (us->suspend_resume_hook)
143 (us->suspend_resume_hook)(us, US_SUSPEND);
145 /* When runtime PM is working, we'll set a flag to indicate
146 * whether we should autoresume when a SCSI request arrives. */
148 mutex_unlock(&us->dev_mutex);
151 EXPORT_SYMBOL_GPL(usb_stor_suspend);
153 int usb_stor_resume(struct usb_interface *iface)
155 struct us_data *us = usb_get_intfdata(iface);
157 mutex_lock(&us->dev_mutex);
159 US_DEBUGP("%s\n", __func__);
160 if (us->suspend_resume_hook)
161 (us->suspend_resume_hook)(us, US_RESUME);
163 mutex_unlock(&us->dev_mutex);
166 EXPORT_SYMBOL_GPL(usb_stor_resume);
168 int usb_stor_reset_resume(struct usb_interface *iface)
170 struct us_data *us = usb_get_intfdata(iface);
172 US_DEBUGP("%s\n", __func__);
174 /* Report the reset to the SCSI core */
175 usb_stor_report_bus_reset(us);
177 /* FIXME: Notify the subdrivers that they need to reinitialize
181 EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
183 #endif /* CONFIG_PM */
186 * The next two routines get called just before and just after
187 * a USB port reset, whether from this driver or a different one.
190 int usb_stor_pre_reset(struct usb_interface *iface)
192 struct us_data *us = usb_get_intfdata(iface);
194 US_DEBUGP("%s\n", __func__);
196 /* Make sure no command runs during the reset */
197 mutex_lock(&us->dev_mutex);
200 EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
202 int usb_stor_post_reset(struct usb_interface *iface)
204 struct us_data *us = usb_get_intfdata(iface);
206 US_DEBUGP("%s\n", __func__);
208 /* Report the reset to the SCSI core */
209 usb_stor_report_bus_reset(us);
211 /* FIXME: Notify the subdrivers that they need to reinitialize
214 mutex_unlock(&us->dev_mutex);
217 EXPORT_SYMBOL_GPL(usb_stor_post_reset);
220 * fill_inquiry_response takes an unsigned char array (which must
221 * be at least 36 characters) and populates the vendor name,
222 * product name, and revision fields. Then the array is copied
223 * into the SCSI command's response buffer (oddly enough
224 * called request_buffer). data_len contains the length of the
225 * data array, which again must be at least 36.
228 void fill_inquiry_response(struct us_data *us, unsigned char *data,
229 unsigned int data_len)
231 if (data_len<36) // You lose.
234 if(data[0]&0x20) { /* USB device currently not connected. Return
235 peripheral qualifier 001b ("...however, the
236 physical device is not currently connected
237 to this logical unit") and leave vendor and
238 product identification empty. ("If the target
239 does store some of the INQUIRY data on the
240 device, it may return zeros or ASCII spaces
241 (20h) in those fields until the data is
242 available from the device."). */
245 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
246 memcpy(data+8, us->unusual_dev->vendorName,
247 strlen(us->unusual_dev->vendorName) > 8 ? 8 :
248 strlen(us->unusual_dev->vendorName));
249 memcpy(data+16, us->unusual_dev->productName,
250 strlen(us->unusual_dev->productName) > 16 ? 16 :
251 strlen(us->unusual_dev->productName));
252 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
253 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
254 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
255 data[35] = 0x30 + ((bcdDevice) & 0x0F);
258 usb_stor_set_xfer_buf(data, data_len, us->srb);
260 EXPORT_SYMBOL_GPL(fill_inquiry_response);
262 static int usb_stor_control_thread(void * __us)
264 struct us_data *us = (struct us_data *)__us;
265 struct Scsi_Host *host = us_to_host(us);
268 US_DEBUGP("*** thread sleeping.\n");
269 if (wait_for_completion_interruptible(&us->cmnd_ready))
272 US_DEBUGP("*** thread awakened.\n");
274 /* lock the device pointers */
275 mutex_lock(&(us->dev_mutex));
277 /* lock access to the state */
280 /* When we are called with no command pending, we're done */
281 if (us->srb == NULL) {
283 mutex_unlock(&us->dev_mutex);
284 US_DEBUGP("-- exiting\n");
288 /* has the command timed out *already* ? */
289 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
290 us->srb->result = DID_ABORT << 16;
296 /* reject the command if the direction indicator
299 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
300 US_DEBUGP("UNKNOWN data direction\n");
301 us->srb->result = DID_ERROR << 16;
304 /* reject if target != 0 or if LUN is higher than
305 * the maximum known LUN
307 else if (us->srb->device->id &&
308 !(us->fflags & US_FL_SCM_MULT_TARG)) {
309 US_DEBUGP("Bad target number (%d:%d)\n",
310 us->srb->device->id, us->srb->device->lun);
311 us->srb->result = DID_BAD_TARGET << 16;
314 else if (us->srb->device->lun > us->max_lun) {
315 US_DEBUGP("Bad LUN (%d:%d)\n",
316 us->srb->device->id, us->srb->device->lun);
317 us->srb->result = DID_BAD_TARGET << 16;
320 /* Handle those devices which need us to fake
321 * their inquiry data */
322 else if ((us->srb->cmnd[0] == INQUIRY) &&
323 (us->fflags & US_FL_FIX_INQUIRY)) {
324 unsigned char data_ptr[36] = {
325 0x00, 0x80, 0x02, 0x02,
326 0x1F, 0x00, 0x00, 0x00};
328 US_DEBUGP("Faking INQUIRY command\n");
329 fill_inquiry_response(us, data_ptr, 36);
330 us->srb->result = SAM_STAT_GOOD;
333 /* we've got a command, let's do it! */
335 US_DEBUG(usb_stor_show_command(us->srb));
336 us->proto_handler(us->srb, us);
339 /* lock access to the state */
342 /* indicate that the command is done */
343 if (us->srb->result != DID_ABORT << 16) {
344 US_DEBUGP("scsi cmd done, result=0x%x\n",
346 us->srb->scsi_done(us->srb);
349 US_DEBUGP("scsi command aborted\n");
352 /* If an abort request was received we need to signal that
353 * the abort has finished. The proper test for this is
354 * the TIMED_OUT flag, not srb->result == DID_ABORT, because
355 * the timeout might have occurred after the command had
356 * already completed with a different result code. */
357 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
358 complete(&(us->notify));
360 /* Allow USB transfers to resume */
361 clear_bit(US_FLIDX_ABORTING, &us->dflags);
362 clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
365 /* finished working on this command */
369 /* unlock the device pointers */
370 mutex_unlock(&us->dev_mutex);
373 /* Wait until we are told to stop */
375 set_current_state(TASK_INTERRUPTIBLE);
376 if (kthread_should_stop())
380 __set_current_state(TASK_RUNNING);
384 /***********************************************************************
385 * Device probing and disconnecting
386 ***********************************************************************/
388 /* Associate our private data with the USB device */
389 static int associate_dev(struct us_data *us, struct usb_interface *intf)
391 US_DEBUGP("-- %s\n", __func__);
393 /* Fill in the device-related fields */
394 us->pusb_dev = interface_to_usbdev(intf);
395 us->pusb_intf = intf;
396 us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
397 US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
398 le16_to_cpu(us->pusb_dev->descriptor.idVendor),
399 le16_to_cpu(us->pusb_dev->descriptor.idProduct),
400 le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
401 US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
402 intf->cur_altsetting->desc.bInterfaceSubClass,
403 intf->cur_altsetting->desc.bInterfaceProtocol);
405 /* Store our private data in the interface */
406 usb_set_intfdata(intf, us);
408 /* Allocate the device-related DMA-mapped buffers */
409 us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
410 GFP_KERNEL, &us->cr_dma);
412 US_DEBUGP("usb_ctrlrequest allocation failed\n");
416 us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE,
417 GFP_KERNEL, &us->iobuf_dma);
419 US_DEBUGP("I/O buffer allocation failed\n");
425 /* Works only for digits and letters, but small and fast */
426 #define TOLOWER(x) ((x) | 0x20)
428 /* Adjust device flags based on the "quirks=" module parameter */
429 static void adjust_quirks(struct us_data *us)
432 u16 vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor);
433 u16 pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct);
435 unsigned int mask = (US_FL_SANE_SENSE | US_FL_FIX_CAPACITY |
436 US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
437 US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
438 US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
439 US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT);
443 /* Each entry consists of VID:PID:flags */
444 if (vid == simple_strtoul(p, &p, 16) &&
446 pid == simple_strtoul(p+1, &p, 16) &&
450 /* Move forward to the next entry */
456 if (!*p) /* No match */
459 /* Collect the flags */
460 while (*++p && *p != ',') {
461 switch (TOLOWER(*p)) {
463 f |= US_FL_SANE_SENSE;
466 f |= US_FL_FIX_CAPACITY;
469 f |= US_FL_CAPACITY_HEURISTICS;
472 f |= US_FL_IGNORE_DEVICE;
475 f |= US_FL_NOT_LOCKABLE;
478 f |= US_FL_MAX_SECTORS_64;
481 f |= US_FL_CAPACITY_OK;
484 f |= US_FL_IGNORE_RESIDUE;
487 f |= US_FL_SINGLE_LUN;
490 f |= US_FL_NO_WP_DETECT;
492 /* Ignore unrecognized flag characters */
495 us->fflags = (us->fflags & ~mask) | f;
496 dev_info(&us->pusb_intf->dev, "Quirks match for "
497 "vid %04x pid %04x: %x\n",
501 /* Get the unusual_devs entries and the string descriptors */
502 static int get_device_info(struct us_data *us, const struct usb_device_id *id,
503 struct us_unusual_dev *unusual_dev)
505 struct usb_device *dev = us->pusb_dev;
506 struct usb_interface_descriptor *idesc =
507 &us->pusb_intf->cur_altsetting->desc;
509 /* Store the entries */
510 us->unusual_dev = unusual_dev;
511 us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ?
512 idesc->bInterfaceSubClass :
513 unusual_dev->useProtocol;
514 us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
515 idesc->bInterfaceProtocol :
516 unusual_dev->useTransport;
517 us->fflags = USB_US_ORIG_FLAGS(id->driver_info);
520 if (us->fflags & US_FL_IGNORE_DEVICE) {
521 printk(KERN_INFO USB_STORAGE "device ignored\n");
526 * This flag is only needed when we're in high-speed, so let's
527 * disable it if we're in full-speed
529 if (dev->speed != USB_SPEED_HIGH)
530 us->fflags &= ~US_FL_GO_SLOW;
532 /* Log a message if a non-generic unusual_dev entry contains an
533 * unnecessary subclass or protocol override. This may stimulate
534 * reports from users that will help us remove unneeded entries
535 * from the unusual_devs.h table.
537 if (id->idVendor || id->idProduct) {
538 static const char *msgs[3] = {
539 "an unneeded SubClass entry",
540 "an unneeded Protocol entry",
541 "unneeded SubClass and Protocol entries"};
542 struct usb_device_descriptor *ddesc = &dev->descriptor;
545 if (unusual_dev->useProtocol != US_SC_DEVICE &&
546 us->subclass == idesc->bInterfaceSubClass)
548 if (unusual_dev->useTransport != US_PR_DEVICE &&
549 us->protocol == idesc->bInterfaceProtocol)
551 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
552 printk(KERN_NOTICE USB_STORAGE "This device "
553 "(%04x,%04x,%04x S %02x P %02x)"
554 " has %s in unusual_devs.h (kernel"
556 " Please send a copy of this message to "
557 "<linux-usb@vger.kernel.org> and "
558 "<usb-storage@lists.one-eyed-alien.net>\n",
559 le16_to_cpu(ddesc->idVendor),
560 le16_to_cpu(ddesc->idProduct),
561 le16_to_cpu(ddesc->bcdDevice),
562 idesc->bInterfaceSubClass,
563 idesc->bInterfaceProtocol,
571 /* Get the transport settings */
572 static void get_transport(struct us_data *us)
574 switch (us->protocol) {
576 us->transport_name = "Control/Bulk";
577 us->transport = usb_stor_CB_transport;
578 us->transport_reset = usb_stor_CB_reset;
583 us->transport_name = "Control/Bulk/Interrupt";
584 us->transport = usb_stor_CB_transport;
585 us->transport_reset = usb_stor_CB_reset;
590 us->transport_name = "Bulk";
591 us->transport = usb_stor_Bulk_transport;
592 us->transport_reset = usb_stor_Bulk_reset;
597 /* Get the protocol settings */
598 static void get_protocol(struct us_data *us)
600 switch (us->subclass) {
602 us->protocol_name = "Reduced Block Commands (RBC)";
603 us->proto_handler = usb_stor_transparent_scsi_command;
607 us->protocol_name = "8020i";
608 us->proto_handler = usb_stor_pad12_command;
613 us->protocol_name = "QIC-157";
614 us->proto_handler = usb_stor_pad12_command;
619 us->protocol_name = "8070i";
620 us->proto_handler = usb_stor_pad12_command;
625 us->protocol_name = "Transparent SCSI";
626 us->proto_handler = usb_stor_transparent_scsi_command;
630 us->protocol_name = "Uniform Floppy Interface (UFI)";
631 us->proto_handler = usb_stor_ufi_command;
636 /* Get the pipe settings */
637 static int get_pipes(struct us_data *us)
639 struct usb_host_interface *altsetting =
640 us->pusb_intf->cur_altsetting;
642 struct usb_endpoint_descriptor *ep;
643 struct usb_endpoint_descriptor *ep_in = NULL;
644 struct usb_endpoint_descriptor *ep_out = NULL;
645 struct usb_endpoint_descriptor *ep_int = NULL;
648 * Find the first endpoint of each type we need.
649 * We are expecting a minimum of 2 endpoints - in and out (bulk).
650 * An optional interrupt-in is OK (necessary for CBI protocol).
651 * We will ignore any others.
653 for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
654 ep = &altsetting->endpoint[i].desc;
656 if (usb_endpoint_xfer_bulk(ep)) {
657 if (usb_endpoint_dir_in(ep)) {
666 else if (usb_endpoint_is_int_in(ep)) {
672 if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) {
673 US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n");
677 /* Calculate and store the pipe values */
678 us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
679 us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
680 us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
681 usb_endpoint_num(ep_out));
682 us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
683 usb_endpoint_num(ep_in));
685 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
686 usb_endpoint_num(ep_int));
687 us->ep_bInterval = ep_int->bInterval;
692 /* Initialize all the dynamic resources we need */
693 static int usb_stor_acquire_resources(struct us_data *us)
696 struct task_struct *th;
698 us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
699 if (!us->current_urb) {
700 US_DEBUGP("URB allocation failed\n");
704 /* Just before we start our control thread, initialize
705 * the device if it needs initialization */
706 if (us->unusual_dev->initFunction) {
707 p = us->unusual_dev->initFunction(us);
712 /* Start up our control thread */
713 th = kthread_run(usb_stor_control_thread, us, "usb-storage");
715 printk(KERN_WARNING USB_STORAGE
716 "Unable to start control thread\n");
724 /* Release all our dynamic resources */
725 static void usb_stor_release_resources(struct us_data *us)
727 US_DEBUGP("-- %s\n", __func__);
729 /* Tell the control thread to exit. The SCSI host must
730 * already have been removed and the DISCONNECTING flag set
731 * so that we won't accept any more commands.
733 US_DEBUGP("-- sending exit command to thread\n");
734 complete(&us->cmnd_ready);
736 kthread_stop(us->ctl_thread);
738 /* Call the destructor routine, if it exists */
739 if (us->extra_destructor) {
740 US_DEBUGP("-- calling extra_destructor()\n");
741 us->extra_destructor(us->extra);
744 /* Free the extra data and the URB */
746 usb_free_urb(us->current_urb);
749 /* Dissociate from the USB device */
750 static void dissociate_dev(struct us_data *us)
752 US_DEBUGP("-- %s\n", __func__);
754 /* Free the device-related DMA-mapped buffers */
756 usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
759 usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
762 /* Remove our private data from the interface */
763 usb_set_intfdata(us->pusb_intf, NULL);
766 /* First stage of disconnect processing: stop SCSI scanning,
767 * remove the host, and stop accepting new commands
769 static void quiesce_and_remove_host(struct us_data *us)
771 struct Scsi_Host *host = us_to_host(us);
773 /* If the device is really gone, cut short reset delays */
774 if (us->pusb_dev->state == USB_STATE_NOTATTACHED)
775 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
777 /* Prevent SCSI-scanning (if it hasn't started yet)
778 * and wait for the SCSI-scanning thread to stop.
780 set_bit(US_FLIDX_DONT_SCAN, &us->dflags);
781 wake_up(&us->delay_wait);
782 wait_for_completion(&us->scanning_done);
784 /* Removing the host will perform an orderly shutdown: caches
785 * synchronized, disks spun down, etc.
787 scsi_remove_host(host);
789 /* Prevent any new commands from being accepted and cut short
793 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
795 wake_up(&us->delay_wait);
798 /* Second stage of disconnect processing: deallocate all resources */
799 static void release_everything(struct us_data *us)
801 usb_stor_release_resources(us);
804 /* Drop our reference to the host; the SCSI core will free it
805 * (and "us" along with it) when the refcount becomes 0. */
806 scsi_host_put(us_to_host(us));
809 /* Thread to carry out delayed SCSI-device scanning */
810 static int usb_stor_scan_thread(void * __us)
812 struct us_data *us = (struct us_data *)__us;
815 "usb-storage: device found at %d\n", us->pusb_dev->devnum);
818 /* Wait for the timeout to expire or for a disconnect */
820 printk(KERN_DEBUG "usb-storage: waiting for device "
821 "to settle before scanning\n");
822 wait_event_freezable_timeout(us->delay_wait,
823 test_bit(US_FLIDX_DONT_SCAN, &us->dflags),
827 /* If the device is still connected, perform the scanning */
828 if (!test_bit(US_FLIDX_DONT_SCAN, &us->dflags)) {
830 /* For bulk-only devices, determine the max LUN value */
831 if (us->protocol == US_PR_BULK &&
832 !(us->fflags & US_FL_SINGLE_LUN)) {
833 mutex_lock(&us->dev_mutex);
834 us->max_lun = usb_stor_Bulk_max_lun(us);
835 mutex_unlock(&us->dev_mutex);
837 scsi_scan_host(us_to_host(us));
838 printk(KERN_DEBUG "usb-storage: device scan complete\n");
840 /* Should we unbind if no devices were detected? */
843 complete_and_exit(&us->scanning_done, 0);
847 /* First part of general USB mass-storage probing */
848 int usb_stor_probe1(struct us_data **pus,
849 struct usb_interface *intf,
850 const struct usb_device_id *id,
851 struct us_unusual_dev *unusual_dev)
853 struct Scsi_Host *host;
857 US_DEBUGP("USB Mass Storage device detected\n");
860 * Ask the SCSI layer to allocate a host structure, with extra
861 * space at the end for our private us_data structure.
863 host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
865 printk(KERN_WARNING USB_STORAGE
866 "Unable to allocate the scsi host\n");
871 * Allow 16-byte CDBs and thus > 2TB
873 host->max_cmd_len = 16;
874 *pus = us = host_to_us(host);
875 memset(us, 0, sizeof(struct us_data));
876 mutex_init(&(us->dev_mutex));
877 init_completion(&us->cmnd_ready);
878 init_completion(&(us->notify));
879 init_waitqueue_head(&us->delay_wait);
880 init_completion(&us->scanning_done);
882 /* Associate the us_data structure with the USB device */
883 result = associate_dev(us, intf);
887 /* Get the unusual_devs entries and the descriptors */
888 result = get_device_info(us, id, unusual_dev);
892 /* Get standard transport and protocol settings */
896 /* Give the caller a chance to fill in specialized transport
897 * or protocol settings.
902 US_DEBUGP("storage_probe() failed\n");
903 release_everything(us);
906 EXPORT_SYMBOL_GPL(usb_stor_probe1);
908 /* Second part of general USB mass-storage probing */
909 int usb_stor_probe2(struct us_data *us)
911 struct task_struct *th;
914 /* Make sure the transport and protocol have both been set */
915 if (!us->transport || !us->proto_handler) {
919 US_DEBUGP("Transport: %s\n", us->transport_name);
920 US_DEBUGP("Protocol: %s\n", us->protocol_name);
922 /* fix for single-lun devices */
923 if (us->fflags & US_FL_SINGLE_LUN)
926 /* Find the endpoints and calculate pipe values */
927 result = get_pipes(us);
931 /* Acquire all the other resources and add the host */
932 result = usb_stor_acquire_resources(us);
935 result = scsi_add_host(us_to_host(us), &us->pusb_intf->dev);
937 printk(KERN_WARNING USB_STORAGE
938 "Unable to add the scsi host\n");
942 /* Start up the thread for delayed SCSI-device scanning */
943 th = kthread_create(usb_stor_scan_thread, us, "usb-stor-scan");
945 printk(KERN_WARNING USB_STORAGE
946 "Unable to start the device-scanning thread\n");
947 complete(&us->scanning_done);
948 quiesce_and_remove_host(us);
949 result = PTR_ERR(th);
957 /* We come here if there are any problems */
959 US_DEBUGP("storage_probe() failed\n");
960 release_everything(us);
963 EXPORT_SYMBOL_GPL(usb_stor_probe2);
965 /* Handle a USB mass-storage disconnect */
966 void usb_stor_disconnect(struct usb_interface *intf)
968 struct us_data *us = usb_get_intfdata(intf);
970 US_DEBUGP("storage_disconnect() called\n");
971 quiesce_and_remove_host(us);
972 release_everything(us);
974 EXPORT_SYMBOL_GPL(usb_stor_disconnect);
976 /* The main probe routine for standard devices */
977 static int storage_probe(struct usb_interface *intf,
978 const struct usb_device_id *id)
984 * If libusual is configured, let it decide whether a standard
985 * device should be handled by usb-storage or by ub.
986 * If the device isn't standard (is handled by a subdriver
987 * module) then don't accept it.
989 if (usb_usual_check_type(id, USB_US_TYPE_STOR) ||
990 usb_usual_ignore_device(intf))
994 * Call the general probe procedures.
996 * The unusual_dev_list array is parallel to the usb_storage_usb_ids
997 * table, so we use the index of the id entry to find the
998 * corresponding unusual_devs entry.
1000 result = usb_stor_probe1(&us, intf, id,
1001 (id - usb_storage_usb_ids) + us_unusual_dev_list);
1005 /* No special transport or protocol settings in the main module */
1007 result = usb_stor_probe2(us);
1011 /***********************************************************************
1012 * Initialization and registration
1013 ***********************************************************************/
1015 static struct usb_driver usb_storage_driver = {
1016 .name = "usb-storage",
1017 .probe = storage_probe,
1018 .disconnect = usb_stor_disconnect,
1019 .suspend = usb_stor_suspend,
1020 .resume = usb_stor_resume,
1021 .reset_resume = usb_stor_reset_resume,
1022 .pre_reset = usb_stor_pre_reset,
1023 .post_reset = usb_stor_post_reset,
1024 .id_table = usb_storage_usb_ids,
1028 static int __init usb_stor_init(void)
1032 printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
1034 /* register the driver, return usb_register return code if error */
1035 retval = usb_register(&usb_storage_driver);
1037 printk(KERN_INFO "USB Mass Storage support registered.\n");
1038 usb_usual_set_present(USB_US_TYPE_STOR);
1043 static void __exit usb_stor_exit(void)
1045 US_DEBUGP("usb_stor_exit() called\n");
1047 /* Deregister the driver
1048 * This will cause disconnect() to be called for each
1051 US_DEBUGP("-- calling usb_deregister()\n");
1052 usb_deregister(&usb_storage_driver) ;
1054 usb_usual_clear_present(USB_US_TYPE_STOR);
1057 module_init(usb_stor_init);
1058 module_exit(usb_stor_exit);