1 /* Driver for USB Mass Storage compliant devices
3 * Current development and maintenance by:
6 * Developed with the assistance of:
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 #ifdef CONFIG_USB_STORAGE_DEBUG
52 #include <linux/sched.h>
53 #include <linux/errno.h>
54 #include <linux/freezer.h>
55 #include <linux/module.h>
56 #include <linux/init.h>
57 #include <linux/slab.h>
58 #include <linux/kthread.h>
59 #include <linux/mutex.h>
60 #include <linux/utsname.h>
62 #include <scsi/scsi.h>
63 #include <scsi/scsi_cmnd.h>
64 #include <scsi/scsi_device.h>
68 #include "transport.h"
71 #include "initializers.h"
73 #include "sierra_ms.h"
74 #include "option_ms.h"
76 /* Some informational data */
78 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
79 MODULE_LICENSE("GPL");
81 static unsigned int delay_use = 1;
82 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
83 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
85 static char quirks[128];
86 module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
87 MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
91 * The entries in this table correspond, line for line,
92 * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
95 /* The vendor name should be kept at eight characters or less, and
96 * the product name should be kept at 16 characters or less. If a device
97 * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
98 * normally generated by a device thorugh the INQUIRY response will be
99 * taken from this list, and this is the reason for the above size
100 * restriction. However, if the flag is not present, then you
101 * are free to use as many characters as you like.
104 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
105 vendor_name, product_name, use_protocol, use_transport, \
106 init_function, Flags) \
108 .vendorName = vendor_name, \
109 .productName = product_name, \
110 .useProtocol = use_protocol, \
111 .useTransport = use_transport, \
112 .initFunction = init_function, \
115 #define COMPLIANT_DEV UNUSUAL_DEV
117 #define USUAL_DEV(use_protocol, use_transport) \
119 .useProtocol = use_protocol, \
120 .useTransport = use_transport, \
123 #define UNUSUAL_VENDOR_INTF(idVendor, cl, sc, pr, \
124 vendor_name, product_name, use_protocol, use_transport, \
125 init_function, Flags) \
127 .vendorName = vendor_name, \
128 .productName = product_name, \
129 .useProtocol = use_protocol, \
130 .useTransport = use_transport, \
131 .initFunction = init_function, \
134 static struct us_unusual_dev us_unusual_dev_list[] = {
135 # include "unusual_devs.h"
136 { } /* Terminating entry */
139 static struct us_unusual_dev for_dynamic_ids =
140 USUAL_DEV(USB_SC_SCSI, USB_PR_BULK);
145 #undef UNUSUAL_VENDOR_INTF
147 #ifdef CONFIG_LOCKDEP
149 static struct lock_class_key us_interface_key[USB_MAXINTERFACES];
151 static void us_set_lock_class(struct mutex *mutex,
152 struct usb_interface *intf)
154 struct usb_device *udev = interface_to_usbdev(intf);
155 struct usb_host_config *config = udev->actconfig;
158 for (i = 0; i < config->desc.bNumInterfaces; i++) {
159 if (config->interface[i] == intf)
163 BUG_ON(i == config->desc.bNumInterfaces);
165 lockdep_set_class(mutex, &us_interface_key[i]);
170 static void us_set_lock_class(struct mutex *mutex,
171 struct usb_interface *intf)
177 #ifdef CONFIG_PM /* Minimal support for suspend and resume */
179 int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
181 struct us_data *us = usb_get_intfdata(iface);
183 /* Wait until no command is running */
184 mutex_lock(&us->dev_mutex);
186 US_DEBUGP("%s\n", __func__);
187 if (us->suspend_resume_hook)
188 (us->suspend_resume_hook)(us, US_SUSPEND);
190 /* When runtime PM is working, we'll set a flag to indicate
191 * whether we should autoresume when a SCSI request arrives. */
193 mutex_unlock(&us->dev_mutex);
196 EXPORT_SYMBOL_GPL(usb_stor_suspend);
198 int usb_stor_resume(struct usb_interface *iface)
200 struct us_data *us = usb_get_intfdata(iface);
202 mutex_lock(&us->dev_mutex);
204 US_DEBUGP("%s\n", __func__);
205 if (us->suspend_resume_hook)
206 (us->suspend_resume_hook)(us, US_RESUME);
208 mutex_unlock(&us->dev_mutex);
211 EXPORT_SYMBOL_GPL(usb_stor_resume);
213 int usb_stor_reset_resume(struct usb_interface *iface)
215 struct us_data *us = usb_get_intfdata(iface);
217 US_DEBUGP("%s\n", __func__);
219 /* Report the reset to the SCSI core */
220 usb_stor_report_bus_reset(us);
222 /* FIXME: Notify the subdrivers that they need to reinitialize
226 EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
228 #endif /* CONFIG_PM */
231 * The next two routines get called just before and just after
232 * a USB port reset, whether from this driver or a different one.
235 int usb_stor_pre_reset(struct usb_interface *iface)
237 struct us_data *us = usb_get_intfdata(iface);
239 US_DEBUGP("%s\n", __func__);
241 /* Make sure no command runs during the reset */
242 mutex_lock(&us->dev_mutex);
245 EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
247 int usb_stor_post_reset(struct usb_interface *iface)
249 struct us_data *us = usb_get_intfdata(iface);
251 US_DEBUGP("%s\n", __func__);
253 /* Report the reset to the SCSI core */
254 usb_stor_report_bus_reset(us);
256 /* FIXME: Notify the subdrivers that they need to reinitialize
259 mutex_unlock(&us->dev_mutex);
262 EXPORT_SYMBOL_GPL(usb_stor_post_reset);
265 * fill_inquiry_response takes an unsigned char array (which must
266 * be at least 36 characters) and populates the vendor name,
267 * product name, and revision fields. Then the array is copied
268 * into the SCSI command's response buffer (oddly enough
269 * called request_buffer). data_len contains the length of the
270 * data array, which again must be at least 36.
273 void fill_inquiry_response(struct us_data *us, unsigned char *data,
274 unsigned int data_len)
276 if (data_len < 36) /* You lose. */
279 memset(data+8, ' ', 28);
280 if (data[0]&0x20) { /* USB device currently not connected. Return
281 peripheral qualifier 001b ("...however, the
282 physical device is not currently connected
283 to this logical unit") and leave vendor and
284 product identification empty. ("If the target
285 does store some of the INQUIRY data on the
286 device, it may return zeros or ASCII spaces
287 (20h) in those fields until the data is
288 available from the device."). */
290 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
293 n = strlen(us->unusual_dev->vendorName);
294 memcpy(data+8, us->unusual_dev->vendorName, min(8, n));
295 n = strlen(us->unusual_dev->productName);
296 memcpy(data+16, us->unusual_dev->productName, min(16, n));
298 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
299 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
300 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
301 data[35] = 0x30 + ((bcdDevice) & 0x0F);
304 usb_stor_set_xfer_buf(data, data_len, us->srb);
306 EXPORT_SYMBOL_GPL(fill_inquiry_response);
308 static int usb_stor_control_thread(void * __us)
310 struct us_data *us = (struct us_data *)__us;
311 struct Scsi_Host *host = us_to_host(us);
314 US_DEBUGP("*** thread sleeping.\n");
315 if (wait_for_completion_interruptible(&us->cmnd_ready))
318 US_DEBUGP("*** thread awakened.\n");
320 /* lock the device pointers */
321 mutex_lock(&(us->dev_mutex));
323 /* lock access to the state */
326 /* When we are called with no command pending, we're done */
327 if (us->srb == NULL) {
329 mutex_unlock(&us->dev_mutex);
330 US_DEBUGP("-- exiting\n");
334 /* has the command timed out *already* ? */
335 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
336 us->srb->result = DID_ABORT << 16;
342 /* reject the command if the direction indicator
345 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
346 US_DEBUGP("UNKNOWN data direction\n");
347 us->srb->result = DID_ERROR << 16;
350 /* reject if target != 0 or if LUN is higher than
351 * the maximum known LUN
353 else if (us->srb->device->id &&
354 !(us->fflags & US_FL_SCM_MULT_TARG)) {
355 US_DEBUGP("Bad target number (%d:%d)\n",
356 us->srb->device->id, us->srb->device->lun);
357 us->srb->result = DID_BAD_TARGET << 16;
360 else if (us->srb->device->lun > us->max_lun) {
361 US_DEBUGP("Bad LUN (%d:%d)\n",
362 us->srb->device->id, us->srb->device->lun);
363 us->srb->result = DID_BAD_TARGET << 16;
366 /* Handle those devices which need us to fake
367 * their inquiry data */
368 else if ((us->srb->cmnd[0] == INQUIRY) &&
369 (us->fflags & US_FL_FIX_INQUIRY)) {
370 unsigned char data_ptr[36] = {
371 0x00, 0x80, 0x02, 0x02,
372 0x1F, 0x00, 0x00, 0x00};
374 US_DEBUGP("Faking INQUIRY command\n");
375 fill_inquiry_response(us, data_ptr, 36);
376 us->srb->result = SAM_STAT_GOOD;
379 /* we've got a command, let's do it! */
381 US_DEBUG(usb_stor_show_command(us->srb));
382 us->proto_handler(us->srb, us);
383 usb_mark_last_busy(us->pusb_dev);
386 /* lock access to the state */
389 /* indicate that the command is done */
390 if (us->srb->result != DID_ABORT << 16) {
391 US_DEBUGP("scsi cmd done, result=0x%x\n",
393 us->srb->scsi_done(us->srb);
396 US_DEBUGP("scsi command aborted\n");
399 /* If an abort request was received we need to signal that
400 * the abort has finished. The proper test for this is
401 * the TIMED_OUT flag, not srb->result == DID_ABORT, because
402 * the timeout might have occurred after the command had
403 * already completed with a different result code. */
404 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
405 complete(&(us->notify));
407 /* Allow USB transfers to resume */
408 clear_bit(US_FLIDX_ABORTING, &us->dflags);
409 clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
412 /* finished working on this command */
416 /* unlock the device pointers */
417 mutex_unlock(&us->dev_mutex);
420 /* Wait until we are told to stop */
422 set_current_state(TASK_INTERRUPTIBLE);
423 if (kthread_should_stop())
427 __set_current_state(TASK_RUNNING);
431 /***********************************************************************
432 * Device probing and disconnecting
433 ***********************************************************************/
435 /* Associate our private data with the USB device */
436 static int associate_dev(struct us_data *us, struct usb_interface *intf)
438 US_DEBUGP("-- %s\n", __func__);
440 /* Fill in the device-related fields */
441 us->pusb_dev = interface_to_usbdev(intf);
442 us->pusb_intf = intf;
443 us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
444 US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
445 le16_to_cpu(us->pusb_dev->descriptor.idVendor),
446 le16_to_cpu(us->pusb_dev->descriptor.idProduct),
447 le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
448 US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
449 intf->cur_altsetting->desc.bInterfaceSubClass,
450 intf->cur_altsetting->desc.bInterfaceProtocol);
452 /* Store our private data in the interface */
453 usb_set_intfdata(intf, us);
455 /* Allocate the control/setup and DMA-mapped buffers */
456 us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
458 US_DEBUGP("usb_ctrlrequest allocation failed\n");
462 us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE,
463 GFP_KERNEL, &us->iobuf_dma);
465 US_DEBUGP("I/O buffer allocation failed\n");
471 /* Works only for digits and letters, but small and fast */
472 #define TOLOWER(x) ((x) | 0x20)
474 /* Adjust device flags based on the "quirks=" module parameter */
475 static void adjust_quirks(struct us_data *us)
478 u16 vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor);
479 u16 pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct);
481 unsigned int mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE |
483 US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
484 US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
485 US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
486 US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
487 US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
488 US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE);
492 /* Each entry consists of VID:PID:flags */
493 if (vid == simple_strtoul(p, &p, 16) &&
495 pid == simple_strtoul(p+1, &p, 16) &&
499 /* Move forward to the next entry */
505 if (!*p) /* No match */
508 /* Collect the flags */
509 while (*++p && *p != ',') {
510 switch (TOLOWER(*p)) {
512 f |= US_FL_SANE_SENSE;
515 f |= US_FL_BAD_SENSE;
518 f |= US_FL_FIX_CAPACITY;
521 f |= US_FL_NO_READ_DISC_INFO;
524 f |= US_FL_NO_READ_CAPACITY_16;
527 f |= US_FL_CAPACITY_HEURISTICS;
530 f |= US_FL_IGNORE_DEVICE;
533 f |= US_FL_NOT_LOCKABLE;
536 f |= US_FL_MAX_SECTORS_64;
539 f |= US_FL_INITIAL_READ10;
542 f |= US_FL_CAPACITY_OK;
545 f |= US_FL_WRITE_CACHE;
548 f |= US_FL_IGNORE_RESIDUE;
551 f |= US_FL_SINGLE_LUN;
554 f |= US_FL_NO_WP_DETECT;
556 /* Ignore unrecognized flag characters */
559 us->fflags = (us->fflags & ~mask) | f;
562 /* Get the unusual_devs entries and the string descriptors */
563 static int get_device_info(struct us_data *us, const struct usb_device_id *id,
564 struct us_unusual_dev *unusual_dev)
566 struct usb_device *dev = us->pusb_dev;
567 struct usb_interface_descriptor *idesc =
568 &us->pusb_intf->cur_altsetting->desc;
569 struct device *pdev = &us->pusb_intf->dev;
571 /* Store the entries */
572 us->unusual_dev = unusual_dev;
573 us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ?
574 idesc->bInterfaceSubClass :
575 unusual_dev->useProtocol;
576 us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ?
577 idesc->bInterfaceProtocol :
578 unusual_dev->useTransport;
579 us->fflags = id->driver_info;
582 if (us->fflags & US_FL_IGNORE_DEVICE) {
583 dev_info(pdev, "device ignored\n");
588 * This flag is only needed when we're in high-speed, so let's
589 * disable it if we're in full-speed
591 if (dev->speed != USB_SPEED_HIGH)
592 us->fflags &= ~US_FL_GO_SLOW;
595 dev_info(pdev, "Quirks match for vid %04x pid %04x: %lx\n",
596 le16_to_cpu(dev->descriptor.idVendor),
597 le16_to_cpu(dev->descriptor.idProduct),
600 /* Log a message if a non-generic unusual_dev entry contains an
601 * unnecessary subclass or protocol override. This may stimulate
602 * reports from users that will help us remove unneeded entries
603 * from the unusual_devs.h table.
605 if (id->idVendor || id->idProduct) {
606 static const char *msgs[3] = {
607 "an unneeded SubClass entry",
608 "an unneeded Protocol entry",
609 "unneeded SubClass and Protocol entries"};
610 struct usb_device_descriptor *ddesc = &dev->descriptor;
613 if (unusual_dev->useProtocol != USB_SC_DEVICE &&
614 us->subclass == idesc->bInterfaceSubClass)
616 if (unusual_dev->useTransport != USB_PR_DEVICE &&
617 us->protocol == idesc->bInterfaceProtocol)
619 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
620 dev_notice(pdev, "This device "
621 "(%04x,%04x,%04x S %02x P %02x)"
622 " has %s in unusual_devs.h (kernel"
624 " Please send a copy of this message to "
627 le16_to_cpu(ddesc->idVendor),
628 le16_to_cpu(ddesc->idProduct),
629 le16_to_cpu(ddesc->bcdDevice),
630 idesc->bInterfaceSubClass,
631 idesc->bInterfaceProtocol,
639 /* Get the transport settings */
640 static void get_transport(struct us_data *us)
642 switch (us->protocol) {
644 us->transport_name = "Control/Bulk";
645 us->transport = usb_stor_CB_transport;
646 us->transport_reset = usb_stor_CB_reset;
651 us->transport_name = "Control/Bulk/Interrupt";
652 us->transport = usb_stor_CB_transport;
653 us->transport_reset = usb_stor_CB_reset;
658 us->transport_name = "Bulk";
659 us->transport = usb_stor_Bulk_transport;
660 us->transport_reset = usb_stor_Bulk_reset;
665 /* Get the protocol settings */
666 static void get_protocol(struct us_data *us)
668 switch (us->subclass) {
670 us->protocol_name = "Reduced Block Commands (RBC)";
671 us->proto_handler = usb_stor_transparent_scsi_command;
675 us->protocol_name = "8020i";
676 us->proto_handler = usb_stor_pad12_command;
681 us->protocol_name = "QIC-157";
682 us->proto_handler = usb_stor_pad12_command;
687 us->protocol_name = "8070i";
688 us->proto_handler = usb_stor_pad12_command;
693 us->protocol_name = "Transparent SCSI";
694 us->proto_handler = usb_stor_transparent_scsi_command;
698 us->protocol_name = "Uniform Floppy Interface (UFI)";
699 us->proto_handler = usb_stor_ufi_command;
704 /* Get the pipe settings */
705 static int get_pipes(struct us_data *us)
707 struct usb_host_interface *altsetting =
708 us->pusb_intf->cur_altsetting;
710 struct usb_endpoint_descriptor *ep;
711 struct usb_endpoint_descriptor *ep_in = NULL;
712 struct usb_endpoint_descriptor *ep_out = NULL;
713 struct usb_endpoint_descriptor *ep_int = NULL;
716 * Find the first endpoint of each type we need.
717 * We are expecting a minimum of 2 endpoints - in and out (bulk).
718 * An optional interrupt-in is OK (necessary for CBI protocol).
719 * We will ignore any others.
721 for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
722 ep = &altsetting->endpoint[i].desc;
724 if (usb_endpoint_xfer_bulk(ep)) {
725 if (usb_endpoint_dir_in(ep)) {
734 else if (usb_endpoint_is_int_in(ep)) {
740 if (!ep_in || !ep_out || (us->protocol == USB_PR_CBI && !ep_int)) {
741 US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n");
745 /* Calculate and store the pipe values */
746 us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
747 us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
748 us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
749 usb_endpoint_num(ep_out));
750 us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
751 usb_endpoint_num(ep_in));
753 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
754 usb_endpoint_num(ep_int));
755 us->ep_bInterval = ep_int->bInterval;
760 /* Initialize all the dynamic resources we need */
761 static int usb_stor_acquire_resources(struct us_data *us)
764 struct task_struct *th;
766 us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
767 if (!us->current_urb) {
768 US_DEBUGP("URB allocation failed\n");
772 /* Just before we start our control thread, initialize
773 * the device if it needs initialization */
774 if (us->unusual_dev->initFunction) {
775 p = us->unusual_dev->initFunction(us);
780 /* Start up our control thread */
781 th = kthread_run(usb_stor_control_thread, us, "usb-storage");
783 dev_warn(&us->pusb_intf->dev,
784 "Unable to start control thread\n");
792 /* Release all our dynamic resources */
793 static void usb_stor_release_resources(struct us_data *us)
795 US_DEBUGP("-- %s\n", __func__);
797 /* Tell the control thread to exit. The SCSI host must
798 * already have been removed and the DISCONNECTING flag set
799 * so that we won't accept any more commands.
801 US_DEBUGP("-- sending exit command to thread\n");
802 complete(&us->cmnd_ready);
804 kthread_stop(us->ctl_thread);
806 /* Call the destructor routine, if it exists */
807 if (us->extra_destructor) {
808 US_DEBUGP("-- calling extra_destructor()\n");
809 us->extra_destructor(us->extra);
812 /* Free the extra data and the URB */
814 usb_free_urb(us->current_urb);
817 /* Dissociate from the USB device */
818 static void dissociate_dev(struct us_data *us)
820 US_DEBUGP("-- %s\n", __func__);
822 /* Free the buffers */
824 usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
826 /* Remove our private data from the interface */
827 usb_set_intfdata(us->pusb_intf, NULL);
830 /* First stage of disconnect processing: stop SCSI scanning,
831 * remove the host, and stop accepting new commands
833 static void quiesce_and_remove_host(struct us_data *us)
835 struct Scsi_Host *host = us_to_host(us);
837 /* If the device is really gone, cut short reset delays */
838 if (us->pusb_dev->state == USB_STATE_NOTATTACHED) {
839 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
840 wake_up(&us->delay_wait);
843 /* Prevent SCSI scanning (if it hasn't started yet)
844 * or wait for the SCSI-scanning routine to stop.
846 cancel_delayed_work_sync(&us->scan_dwork);
848 /* Balance autopm calls if scanning was cancelled */
849 if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags))
850 usb_autopm_put_interface_no_suspend(us->pusb_intf);
852 /* Removing the host will perform an orderly shutdown: caches
853 * synchronized, disks spun down, etc.
855 scsi_remove_host(host);
857 /* Prevent any new commands from being accepted and cut short
861 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
863 wake_up(&us->delay_wait);
866 /* Second stage of disconnect processing: deallocate all resources */
867 static void release_everything(struct us_data *us)
869 usb_stor_release_resources(us);
872 /* Drop our reference to the host; the SCSI core will free it
873 * (and "us" along with it) when the refcount becomes 0. */
874 scsi_host_put(us_to_host(us));
877 /* Delayed-work routine to carry out SCSI-device scanning */
878 static void usb_stor_scan_dwork(struct work_struct *work)
880 struct us_data *us = container_of(work, struct us_data,
882 struct device *dev = &us->pusb_intf->dev;
884 dev_dbg(dev, "starting scan\n");
886 /* For bulk-only devices, determine the max LUN value */
887 if (us->protocol == USB_PR_BULK && !(us->fflags & US_FL_SINGLE_LUN)) {
888 mutex_lock(&us->dev_mutex);
889 us->max_lun = usb_stor_Bulk_max_lun(us);
890 mutex_unlock(&us->dev_mutex);
892 scsi_scan_host(us_to_host(us));
893 dev_dbg(dev, "scan complete\n");
895 /* Should we unbind if no devices were detected? */
897 usb_autopm_put_interface(us->pusb_intf);
898 clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
901 static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
903 struct usb_device *usb_dev = interface_to_usbdev(intf);
905 if (usb_dev->bus->sg_tablesize) {
906 return usb_dev->bus->sg_tablesize;
911 /* First part of general USB mass-storage probing */
912 int usb_stor_probe1(struct us_data **pus,
913 struct usb_interface *intf,
914 const struct usb_device_id *id,
915 struct us_unusual_dev *unusual_dev)
917 struct Scsi_Host *host;
921 US_DEBUGP("USB Mass Storage device detected\n");
924 * Ask the SCSI layer to allocate a host structure, with extra
925 * space at the end for our private us_data structure.
927 host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
930 "Unable to allocate the scsi host\n");
935 * Allow 16-byte CDBs and thus > 2TB
937 host->max_cmd_len = 16;
938 host->sg_tablesize = usb_stor_sg_tablesize(intf);
939 *pus = us = host_to_us(host);
940 mutex_init(&(us->dev_mutex));
941 us_set_lock_class(&us->dev_mutex, intf);
942 init_completion(&us->cmnd_ready);
943 init_completion(&(us->notify));
944 init_waitqueue_head(&us->delay_wait);
945 INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork);
947 /* Associate the us_data structure with the USB device */
948 result = associate_dev(us, intf);
952 /* Get the unusual_devs entries and the descriptors */
953 result = get_device_info(us, id, unusual_dev);
957 /* Get standard transport and protocol settings */
961 /* Give the caller a chance to fill in specialized transport
962 * or protocol settings.
967 US_DEBUGP("storage_probe() failed\n");
968 release_everything(us);
971 EXPORT_SYMBOL_GPL(usb_stor_probe1);
973 /* Second part of general USB mass-storage probing */
974 int usb_stor_probe2(struct us_data *us)
977 struct device *dev = &us->pusb_intf->dev;
979 /* Make sure the transport and protocol have both been set */
980 if (!us->transport || !us->proto_handler) {
984 US_DEBUGP("Transport: %s\n", us->transport_name);
985 US_DEBUGP("Protocol: %s\n", us->protocol_name);
987 /* fix for single-lun devices */
988 if (us->fflags & US_FL_SINGLE_LUN)
991 /* Find the endpoints and calculate pipe values */
992 result = get_pipes(us);
997 * If the device returns invalid data for the first READ(10)
998 * command, indicate the command should be retried.
1000 if (us->fflags & US_FL_INITIAL_READ10)
1001 set_bit(US_FLIDX_REDO_READ10, &us->dflags);
1003 /* Acquire all the other resources and add the host */
1004 result = usb_stor_acquire_resources(us);
1007 snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s",
1008 dev_name(&us->pusb_intf->dev));
1009 result = scsi_add_host(us_to_host(us), dev);
1012 "Unable to add the scsi host\n");
1016 /* Submit the delayed_work for SCSI-device scanning */
1017 usb_autopm_get_interface_no_resume(us->pusb_intf);
1018 set_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
1021 dev_dbg(dev, "waiting for device to settle before scanning\n");
1022 queue_delayed_work(system_freezable_wq, &us->scan_dwork,
1026 /* We come here if there are any problems */
1028 US_DEBUGP("storage_probe() failed\n");
1029 release_everything(us);
1032 EXPORT_SYMBOL_GPL(usb_stor_probe2);
1034 /* Handle a USB mass-storage disconnect */
1035 void usb_stor_disconnect(struct usb_interface *intf)
1037 struct us_data *us = usb_get_intfdata(intf);
1039 US_DEBUGP("storage_disconnect() called\n");
1040 quiesce_and_remove_host(us);
1041 release_everything(us);
1043 EXPORT_SYMBOL_GPL(usb_stor_disconnect);
1045 /* The main probe routine for standard devices */
1046 static int storage_probe(struct usb_interface *intf,
1047 const struct usb_device_id *id)
1049 struct us_unusual_dev *unusual_dev;
1055 * If the device isn't standard (is handled by a subdriver
1056 * module) then don't accept it.
1058 if (usb_usual_ignore_device(intf))
1062 * Call the general probe procedures.
1064 * The unusual_dev_list array is parallel to the usb_storage_usb_ids
1065 * table, so we use the index of the id entry to find the
1066 * corresponding unusual_devs entry.
1069 size = ARRAY_SIZE(us_unusual_dev_list);
1070 if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) {
1071 unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list;
1073 unusual_dev = &for_dynamic_ids;
1075 US_DEBUGP("%s %s 0x%04x 0x%04x\n", "Use Bulk-Only transport",
1076 "with the Transparent SCSI protocol for dynamic id:",
1077 id->idVendor, id->idProduct);
1080 result = usb_stor_probe1(&us, intf, id, unusual_dev);
1084 /* No special transport or protocol settings in the main module */
1086 result = usb_stor_probe2(us);
1090 /***********************************************************************
1091 * Initialization and registration
1092 ***********************************************************************/
1094 static struct usb_driver usb_storage_driver = {
1095 .name = "usb-storage",
1096 .probe = storage_probe,
1097 .disconnect = usb_stor_disconnect,
1098 .suspend = usb_stor_suspend,
1099 .resume = usb_stor_resume,
1100 .reset_resume = usb_stor_reset_resume,
1101 .pre_reset = usb_stor_pre_reset,
1102 .post_reset = usb_stor_post_reset,
1103 .id_table = usb_storage_usb_ids,
1104 .supports_autosuspend = 1,
1108 static int __init usb_stor_init(void)
1112 pr_info("Initializing USB Mass Storage driver...\n");
1114 /* register the driver, return usb_register return code if error */
1115 retval = usb_register(&usb_storage_driver);
1117 pr_info("USB Mass Storage support registered.\n");
1121 static void __exit usb_stor_exit(void)
1123 US_DEBUGP("usb_stor_exit() called\n");
1125 /* Deregister the driver
1126 * This will cause disconnect() to be called for each
1129 US_DEBUGP("-- calling usb_deregister()\n");
1130 usb_deregister(&usb_storage_driver) ;
1133 module_init(usb_stor_init);
1134 module_exit(usb_stor_exit);