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 #include "sierra_ms.h"
70 #include "option_ms.h"
72 /* Some informational data */
73 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
74 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
75 MODULE_LICENSE("GPL");
77 static unsigned int delay_use = 5;
78 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
79 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
81 static char quirks[128];
82 module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
83 MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
87 * The entries in this table correspond, line for line,
88 * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
91 /* The vendor name should be kept at eight characters or less, and
92 * the product name should be kept at 16 characters or less. If a device
93 * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
94 * normally generated by a device thorugh the INQUIRY response will be
95 * taken from this list, and this is the reason for the above size
96 * restriction. However, if the flag is not present, then you
97 * are free to use as many characters as you like.
100 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
101 vendor_name, product_name, use_protocol, use_transport, \
102 init_function, Flags) \
104 .vendorName = vendor_name, \
105 .productName = product_name, \
106 .useProtocol = use_protocol, \
107 .useTransport = use_transport, \
108 .initFunction = init_function, \
111 #define COMPLIANT_DEV UNUSUAL_DEV
113 #define USUAL_DEV(use_protocol, use_transport, use_type) \
115 .useProtocol = use_protocol, \
116 .useTransport = use_transport, \
119 static struct us_unusual_dev us_unusual_dev_list[] = {
120 # include "unusual_devs.h"
121 { } /* Terminating entry */
129 #ifdef CONFIG_PM /* Minimal support for suspend and resume */
131 int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
133 struct us_data *us = usb_get_intfdata(iface);
135 /* Wait until no command is running */
136 mutex_lock(&us->dev_mutex);
138 US_DEBUGP("%s\n", __func__);
139 if (us->suspend_resume_hook)
140 (us->suspend_resume_hook)(us, US_SUSPEND);
142 /* When runtime PM is working, we'll set a flag to indicate
143 * whether we should autoresume when a SCSI request arrives. */
145 mutex_unlock(&us->dev_mutex);
148 EXPORT_SYMBOL_GPL(usb_stor_suspend);
150 int usb_stor_resume(struct usb_interface *iface)
152 struct us_data *us = usb_get_intfdata(iface);
154 mutex_lock(&us->dev_mutex);
156 US_DEBUGP("%s\n", __func__);
157 if (us->suspend_resume_hook)
158 (us->suspend_resume_hook)(us, US_RESUME);
160 mutex_unlock(&us->dev_mutex);
163 EXPORT_SYMBOL_GPL(usb_stor_resume);
165 int usb_stor_reset_resume(struct usb_interface *iface)
167 struct us_data *us = usb_get_intfdata(iface);
169 US_DEBUGP("%s\n", __func__);
171 /* Report the reset to the SCSI core */
172 usb_stor_report_bus_reset(us);
174 /* FIXME: Notify the subdrivers that they need to reinitialize
178 EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
180 #endif /* CONFIG_PM */
183 * The next two routines get called just before and just after
184 * a USB port reset, whether from this driver or a different one.
187 int usb_stor_pre_reset(struct usb_interface *iface)
189 struct us_data *us = usb_get_intfdata(iface);
191 US_DEBUGP("%s\n", __func__);
193 /* Make sure no command runs during the reset */
194 mutex_lock(&us->dev_mutex);
197 EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
199 int usb_stor_post_reset(struct usb_interface *iface)
201 struct us_data *us = usb_get_intfdata(iface);
203 US_DEBUGP("%s\n", __func__);
205 /* Report the reset to the SCSI core */
206 usb_stor_report_bus_reset(us);
208 /* FIXME: Notify the subdrivers that they need to reinitialize
211 mutex_unlock(&us->dev_mutex);
214 EXPORT_SYMBOL_GPL(usb_stor_post_reset);
217 * fill_inquiry_response takes an unsigned char array (which must
218 * be at least 36 characters) and populates the vendor name,
219 * product name, and revision fields. Then the array is copied
220 * into the SCSI command's response buffer (oddly enough
221 * called request_buffer). data_len contains the length of the
222 * data array, which again must be at least 36.
225 void fill_inquiry_response(struct us_data *us, unsigned char *data,
226 unsigned int data_len)
228 if (data_len<36) // You lose.
231 if(data[0]&0x20) { /* USB device currently not connected. Return
232 peripheral qualifier 001b ("...however, the
233 physical device is not currently connected
234 to this logical unit") and leave vendor and
235 product identification empty. ("If the target
236 does store some of the INQUIRY data on the
237 device, it may return zeros or ASCII spaces
238 (20h) in those fields until the data is
239 available from the device."). */
242 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
243 memcpy(data+8, us->unusual_dev->vendorName,
244 strlen(us->unusual_dev->vendorName) > 8 ? 8 :
245 strlen(us->unusual_dev->vendorName));
246 memcpy(data+16, us->unusual_dev->productName,
247 strlen(us->unusual_dev->productName) > 16 ? 16 :
248 strlen(us->unusual_dev->productName));
249 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
250 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
251 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
252 data[35] = 0x30 + ((bcdDevice) & 0x0F);
255 usb_stor_set_xfer_buf(data, data_len, us->srb);
257 EXPORT_SYMBOL_GPL(fill_inquiry_response);
259 static int usb_stor_control_thread(void * __us)
261 struct us_data *us = (struct us_data *)__us;
262 struct Scsi_Host *host = us_to_host(us);
265 US_DEBUGP("*** thread sleeping.\n");
266 if (wait_for_completion_interruptible(&us->cmnd_ready))
269 US_DEBUGP("*** thread awakened.\n");
271 /* lock the device pointers */
272 mutex_lock(&(us->dev_mutex));
274 /* lock access to the state */
277 /* When we are called with no command pending, we're done */
278 if (us->srb == NULL) {
280 mutex_unlock(&us->dev_mutex);
281 US_DEBUGP("-- exiting\n");
285 /* has the command timed out *already* ? */
286 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
287 us->srb->result = DID_ABORT << 16;
293 /* reject the command if the direction indicator
296 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
297 US_DEBUGP("UNKNOWN data direction\n");
298 us->srb->result = DID_ERROR << 16;
301 /* reject if target != 0 or if LUN is higher than
302 * the maximum known LUN
304 else if (us->srb->device->id &&
305 !(us->fflags & US_FL_SCM_MULT_TARG)) {
306 US_DEBUGP("Bad target number (%d:%d)\n",
307 us->srb->device->id, us->srb->device->lun);
308 us->srb->result = DID_BAD_TARGET << 16;
311 else if (us->srb->device->lun > us->max_lun) {
312 US_DEBUGP("Bad LUN (%d:%d)\n",
313 us->srb->device->id, us->srb->device->lun);
314 us->srb->result = DID_BAD_TARGET << 16;
317 /* Handle those devices which need us to fake
318 * their inquiry data */
319 else if ((us->srb->cmnd[0] == INQUIRY) &&
320 (us->fflags & US_FL_FIX_INQUIRY)) {
321 unsigned char data_ptr[36] = {
322 0x00, 0x80, 0x02, 0x02,
323 0x1F, 0x00, 0x00, 0x00};
325 US_DEBUGP("Faking INQUIRY command\n");
326 fill_inquiry_response(us, data_ptr, 36);
327 us->srb->result = SAM_STAT_GOOD;
330 /* we've got a command, let's do it! */
332 US_DEBUG(usb_stor_show_command(us->srb));
333 us->proto_handler(us->srb, us);
336 /* lock access to the state */
339 /* indicate that the command is done */
340 if (us->srb->result != DID_ABORT << 16) {
341 US_DEBUGP("scsi cmd done, result=0x%x\n",
343 us->srb->scsi_done(us->srb);
346 US_DEBUGP("scsi command aborted\n");
349 /* If an abort request was received we need to signal that
350 * the abort has finished. The proper test for this is
351 * the TIMED_OUT flag, not srb->result == DID_ABORT, because
352 * the timeout might have occurred after the command had
353 * already completed with a different result code. */
354 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
355 complete(&(us->notify));
357 /* Allow USB transfers to resume */
358 clear_bit(US_FLIDX_ABORTING, &us->dflags);
359 clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
362 /* finished working on this command */
366 /* unlock the device pointers */
367 mutex_unlock(&us->dev_mutex);
370 /* Wait until we are told to stop */
372 set_current_state(TASK_INTERRUPTIBLE);
373 if (kthread_should_stop())
377 __set_current_state(TASK_RUNNING);
381 /***********************************************************************
382 * Device probing and disconnecting
383 ***********************************************************************/
385 /* Associate our private data with the USB device */
386 static int associate_dev(struct us_data *us, struct usb_interface *intf)
388 US_DEBUGP("-- %s\n", __func__);
390 /* Fill in the device-related fields */
391 us->pusb_dev = interface_to_usbdev(intf);
392 us->pusb_intf = intf;
393 us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
394 US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
395 le16_to_cpu(us->pusb_dev->descriptor.idVendor),
396 le16_to_cpu(us->pusb_dev->descriptor.idProduct),
397 le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
398 US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
399 intf->cur_altsetting->desc.bInterfaceSubClass,
400 intf->cur_altsetting->desc.bInterfaceProtocol);
402 /* Store our private data in the interface */
403 usb_set_intfdata(intf, us);
405 /* Allocate the device-related DMA-mapped buffers */
406 us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
407 GFP_KERNEL, &us->cr_dma);
409 US_DEBUGP("usb_ctrlrequest allocation failed\n");
413 us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE,
414 GFP_KERNEL, &us->iobuf_dma);
416 US_DEBUGP("I/O buffer allocation failed\n");
422 /* Works only for digits and letters, but small and fast */
423 #define TOLOWER(x) ((x) | 0x20)
425 /* Adjust device flags based on the "quirks=" module parameter */
426 static void adjust_quirks(struct us_data *us)
429 u16 vid = le16_to_cpu(us->pusb_dev->descriptor.idVendor);
430 u16 pid = le16_to_cpu(us->pusb_dev->descriptor.idProduct);
432 unsigned int mask = (US_FL_SANE_SENSE | US_FL_FIX_CAPACITY |
433 US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
434 US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
435 US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
436 US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT);
440 /* Each entry consists of VID:PID:flags */
441 if (vid == simple_strtoul(p, &p, 16) &&
443 pid == simple_strtoul(p+1, &p, 16) &&
447 /* Move forward to the next entry */
453 if (!*p) /* No match */
456 /* Collect the flags */
457 while (*++p && *p != ',') {
458 switch (TOLOWER(*p)) {
460 f |= US_FL_SANE_SENSE;
463 f |= US_FL_FIX_CAPACITY;
466 f |= US_FL_CAPACITY_HEURISTICS;
469 f |= US_FL_IGNORE_DEVICE;
472 f |= US_FL_NOT_LOCKABLE;
475 f |= US_FL_MAX_SECTORS_64;
478 f |= US_FL_CAPACITY_OK;
481 f |= US_FL_IGNORE_RESIDUE;
484 f |= US_FL_SINGLE_LUN;
487 f |= US_FL_NO_WP_DETECT;
489 /* Ignore unrecognized flag characters */
492 us->fflags = (us->fflags & ~mask) | f;
493 dev_info(&us->pusb_intf->dev, "Quirks match for "
494 "vid %04x pid %04x: %x\n",
498 /* Get the unusual_devs entries and the string descriptors */
499 static int get_device_info(struct us_data *us, const struct usb_device_id *id,
500 struct us_unusual_dev *unusual_dev)
502 struct usb_device *dev = us->pusb_dev;
503 struct usb_interface_descriptor *idesc =
504 &us->pusb_intf->cur_altsetting->desc;
506 /* Store the entries */
507 us->unusual_dev = unusual_dev;
508 us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ?
509 idesc->bInterfaceSubClass :
510 unusual_dev->useProtocol;
511 us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
512 idesc->bInterfaceProtocol :
513 unusual_dev->useTransport;
514 us->fflags = USB_US_ORIG_FLAGS(id->driver_info);
517 if (us->fflags & US_FL_IGNORE_DEVICE) {
518 printk(KERN_INFO USB_STORAGE "device ignored\n");
523 * This flag is only needed when we're in high-speed, so let's
524 * disable it if we're in full-speed
526 if (dev->speed != USB_SPEED_HIGH)
527 us->fflags &= ~US_FL_GO_SLOW;
529 /* Log a message if a non-generic unusual_dev entry contains an
530 * unnecessary subclass or protocol override. This may stimulate
531 * reports from users that will help us remove unneeded entries
532 * from the unusual_devs.h table.
534 if (id->idVendor || id->idProduct) {
535 static const char *msgs[3] = {
536 "an unneeded SubClass entry",
537 "an unneeded Protocol entry",
538 "unneeded SubClass and Protocol entries"};
539 struct usb_device_descriptor *ddesc = &dev->descriptor;
542 if (unusual_dev->useProtocol != US_SC_DEVICE &&
543 us->subclass == idesc->bInterfaceSubClass)
545 if (unusual_dev->useTransport != US_PR_DEVICE &&
546 us->protocol == idesc->bInterfaceProtocol)
548 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
549 printk(KERN_NOTICE USB_STORAGE "This device "
550 "(%04x,%04x,%04x S %02x P %02x)"
551 " has %s in unusual_devs.h (kernel"
553 " Please send a copy of this message to "
554 "<linux-usb@vger.kernel.org> and "
555 "<usb-storage@lists.one-eyed-alien.net>\n",
556 le16_to_cpu(ddesc->idVendor),
557 le16_to_cpu(ddesc->idProduct),
558 le16_to_cpu(ddesc->bcdDevice),
559 idesc->bInterfaceSubClass,
560 idesc->bInterfaceProtocol,
568 /* Get the transport settings */
569 static void get_transport(struct us_data *us)
571 switch (us->protocol) {
573 us->transport_name = "Control/Bulk";
574 us->transport = usb_stor_CB_transport;
575 us->transport_reset = usb_stor_CB_reset;
580 us->transport_name = "Control/Bulk/Interrupt";
581 us->transport = usb_stor_CB_transport;
582 us->transport_reset = usb_stor_CB_reset;
587 us->transport_name = "Bulk";
588 us->transport = usb_stor_Bulk_transport;
589 us->transport_reset = usb_stor_Bulk_reset;
594 /* Get the protocol settings */
595 static void get_protocol(struct us_data *us)
597 switch (us->subclass) {
599 us->protocol_name = "Reduced Block Commands (RBC)";
600 us->proto_handler = usb_stor_transparent_scsi_command;
604 us->protocol_name = "8020i";
605 us->proto_handler = usb_stor_pad12_command;
610 us->protocol_name = "QIC-157";
611 us->proto_handler = usb_stor_pad12_command;
616 us->protocol_name = "8070i";
617 us->proto_handler = usb_stor_pad12_command;
622 us->protocol_name = "Transparent SCSI";
623 us->proto_handler = usb_stor_transparent_scsi_command;
627 us->protocol_name = "Uniform Floppy Interface (UFI)";
628 us->proto_handler = usb_stor_ufi_command;
633 /* Get the pipe settings */
634 static int get_pipes(struct us_data *us)
636 struct usb_host_interface *altsetting =
637 us->pusb_intf->cur_altsetting;
639 struct usb_endpoint_descriptor *ep;
640 struct usb_endpoint_descriptor *ep_in = NULL;
641 struct usb_endpoint_descriptor *ep_out = NULL;
642 struct usb_endpoint_descriptor *ep_int = NULL;
645 * Find the first endpoint of each type we need.
646 * We are expecting a minimum of 2 endpoints - in and out (bulk).
647 * An optional interrupt-in is OK (necessary for CBI protocol).
648 * We will ignore any others.
650 for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
651 ep = &altsetting->endpoint[i].desc;
653 if (usb_endpoint_xfer_bulk(ep)) {
654 if (usb_endpoint_dir_in(ep)) {
663 else if (usb_endpoint_is_int_in(ep)) {
669 if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) {
670 US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n");
674 /* Calculate and store the pipe values */
675 us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
676 us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
677 us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
678 usb_endpoint_num(ep_out));
679 us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
680 usb_endpoint_num(ep_in));
682 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
683 usb_endpoint_num(ep_int));
684 us->ep_bInterval = ep_int->bInterval;
689 /* Initialize all the dynamic resources we need */
690 static int usb_stor_acquire_resources(struct us_data *us)
693 struct task_struct *th;
695 us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
696 if (!us->current_urb) {
697 US_DEBUGP("URB allocation failed\n");
701 /* Just before we start our control thread, initialize
702 * the device if it needs initialization */
703 if (us->unusual_dev->initFunction) {
704 p = us->unusual_dev->initFunction(us);
709 /* Start up our control thread */
710 th = kthread_run(usb_stor_control_thread, us, "usb-storage");
712 printk(KERN_WARNING USB_STORAGE
713 "Unable to start control thread\n");
721 /* Release all our dynamic resources */
722 static void usb_stor_release_resources(struct us_data *us)
724 US_DEBUGP("-- %s\n", __func__);
726 /* Tell the control thread to exit. The SCSI host must
727 * already have been removed and the DISCONNECTING flag set
728 * so that we won't accept any more commands.
730 US_DEBUGP("-- sending exit command to thread\n");
731 complete(&us->cmnd_ready);
733 kthread_stop(us->ctl_thread);
735 /* Call the destructor routine, if it exists */
736 if (us->extra_destructor) {
737 US_DEBUGP("-- calling extra_destructor()\n");
738 us->extra_destructor(us->extra);
741 /* Free the extra data and the URB */
743 usb_free_urb(us->current_urb);
746 /* Dissociate from the USB device */
747 static void dissociate_dev(struct us_data *us)
749 US_DEBUGP("-- %s\n", __func__);
751 /* Free the device-related DMA-mapped buffers */
753 usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
756 usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
759 /* Remove our private data from the interface */
760 usb_set_intfdata(us->pusb_intf, NULL);
763 /* First stage of disconnect processing: stop SCSI scanning,
764 * remove the host, and stop accepting new commands
766 static void quiesce_and_remove_host(struct us_data *us)
768 struct Scsi_Host *host = us_to_host(us);
770 /* If the device is really gone, cut short reset delays */
771 if (us->pusb_dev->state == USB_STATE_NOTATTACHED)
772 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
774 /* Prevent SCSI-scanning (if it hasn't started yet)
775 * and wait for the SCSI-scanning thread to stop.
777 set_bit(US_FLIDX_DONT_SCAN, &us->dflags);
778 wake_up(&us->delay_wait);
779 wait_for_completion(&us->scanning_done);
781 /* Removing the host will perform an orderly shutdown: caches
782 * synchronized, disks spun down, etc.
784 scsi_remove_host(host);
786 /* Prevent any new commands from being accepted and cut short
790 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
792 wake_up(&us->delay_wait);
795 /* Second stage of disconnect processing: deallocate all resources */
796 static void release_everything(struct us_data *us)
798 usb_stor_release_resources(us);
801 /* Drop our reference to the host; the SCSI core will free it
802 * (and "us" along with it) when the refcount becomes 0. */
803 scsi_host_put(us_to_host(us));
806 /* Thread to carry out delayed SCSI-device scanning */
807 static int usb_stor_scan_thread(void * __us)
809 struct us_data *us = (struct us_data *)__us;
812 "usb-storage: device found at %d\n", us->pusb_dev->devnum);
815 /* Wait for the timeout to expire or for a disconnect */
817 printk(KERN_DEBUG "usb-storage: waiting for device "
818 "to settle before scanning\n");
819 wait_event_freezable_timeout(us->delay_wait,
820 test_bit(US_FLIDX_DONT_SCAN, &us->dflags),
824 /* If the device is still connected, perform the scanning */
825 if (!test_bit(US_FLIDX_DONT_SCAN, &us->dflags)) {
827 /* For bulk-only devices, determine the max LUN value */
828 if (us->protocol == US_PR_BULK &&
829 !(us->fflags & US_FL_SINGLE_LUN)) {
830 mutex_lock(&us->dev_mutex);
831 us->max_lun = usb_stor_Bulk_max_lun(us);
832 mutex_unlock(&us->dev_mutex);
834 scsi_scan_host(us_to_host(us));
835 printk(KERN_DEBUG "usb-storage: device scan complete\n");
837 /* Should we unbind if no devices were detected? */
840 complete_and_exit(&us->scanning_done, 0);
844 /* First part of general USB mass-storage probing */
845 int usb_stor_probe1(struct us_data **pus,
846 struct usb_interface *intf,
847 const struct usb_device_id *id,
848 struct us_unusual_dev *unusual_dev)
850 struct Scsi_Host *host;
854 US_DEBUGP("USB Mass Storage device detected\n");
857 * Ask the SCSI layer to allocate a host structure, with extra
858 * space at the end for our private us_data structure.
860 host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
862 printk(KERN_WARNING USB_STORAGE
863 "Unable to allocate the scsi host\n");
868 * Allow 16-byte CDBs and thus > 2TB
870 host->max_cmd_len = 16;
871 *pus = us = host_to_us(host);
872 memset(us, 0, sizeof(struct us_data));
873 mutex_init(&(us->dev_mutex));
874 init_completion(&us->cmnd_ready);
875 init_completion(&(us->notify));
876 init_waitqueue_head(&us->delay_wait);
877 init_completion(&us->scanning_done);
879 /* Associate the us_data structure with the USB device */
880 result = associate_dev(us, intf);
884 /* Get the unusual_devs entries and the descriptors */
885 result = get_device_info(us, id, unusual_dev);
889 /* Get standard transport and protocol settings */
893 /* Give the caller a chance to fill in specialized transport
894 * or protocol settings.
899 US_DEBUGP("storage_probe() failed\n");
900 release_everything(us);
903 EXPORT_SYMBOL_GPL(usb_stor_probe1);
905 /* Second part of general USB mass-storage probing */
906 int usb_stor_probe2(struct us_data *us)
908 struct task_struct *th;
911 /* Make sure the transport and protocol have both been set */
912 if (!us->transport || !us->proto_handler) {
916 US_DEBUGP("Transport: %s\n", us->transport_name);
917 US_DEBUGP("Protocol: %s\n", us->protocol_name);
919 /* fix for single-lun devices */
920 if (us->fflags & US_FL_SINGLE_LUN)
923 /* Find the endpoints and calculate pipe values */
924 result = get_pipes(us);
928 /* Acquire all the other resources and add the host */
929 result = usb_stor_acquire_resources(us);
932 result = scsi_add_host(us_to_host(us), &us->pusb_intf->dev);
934 printk(KERN_WARNING USB_STORAGE
935 "Unable to add the scsi host\n");
939 /* Start up the thread for delayed SCSI-device scanning */
940 th = kthread_create(usb_stor_scan_thread, us, "usb-stor-scan");
942 printk(KERN_WARNING USB_STORAGE
943 "Unable to start the device-scanning thread\n");
944 complete(&us->scanning_done);
945 quiesce_and_remove_host(us);
946 result = PTR_ERR(th);
954 /* We come here if there are any problems */
956 US_DEBUGP("storage_probe() failed\n");
957 release_everything(us);
960 EXPORT_SYMBOL_GPL(usb_stor_probe2);
962 /* Handle a USB mass-storage disconnect */
963 void usb_stor_disconnect(struct usb_interface *intf)
965 struct us_data *us = usb_get_intfdata(intf);
967 US_DEBUGP("storage_disconnect() called\n");
968 quiesce_and_remove_host(us);
969 release_everything(us);
971 EXPORT_SYMBOL_GPL(usb_stor_disconnect);
973 /* The main probe routine for standard devices */
974 static int storage_probe(struct usb_interface *intf,
975 const struct usb_device_id *id)
981 * If libusual is configured, let it decide whether a standard
982 * device should be handled by usb-storage or by ub.
983 * If the device isn't standard (is handled by a subdriver
984 * module) then don't accept it.
986 if (usb_usual_check_type(id, USB_US_TYPE_STOR) ||
987 usb_usual_ignore_device(intf))
991 * Call the general probe procedures.
993 * The unusual_dev_list array is parallel to the usb_storage_usb_ids
994 * table, so we use the index of the id entry to find the
995 * corresponding unusual_devs entry.
997 result = usb_stor_probe1(&us, intf, id,
998 (id - usb_storage_usb_ids) + us_unusual_dev_list);
1002 /* No special transport or protocol settings in the main module */
1004 result = usb_stor_probe2(us);
1008 /***********************************************************************
1009 * Initialization and registration
1010 ***********************************************************************/
1012 static struct usb_driver usb_storage_driver = {
1013 .name = "usb-storage",
1014 .probe = storage_probe,
1015 .disconnect = usb_stor_disconnect,
1016 .suspend = usb_stor_suspend,
1017 .resume = usb_stor_resume,
1018 .reset_resume = usb_stor_reset_resume,
1019 .pre_reset = usb_stor_pre_reset,
1020 .post_reset = usb_stor_post_reset,
1021 .id_table = usb_storage_usb_ids,
1025 static int __init usb_stor_init(void)
1029 printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
1031 /* register the driver, return usb_register return code if error */
1032 retval = usb_register(&usb_storage_driver);
1034 printk(KERN_INFO "USB Mass Storage support registered.\n");
1035 usb_usual_set_present(USB_US_TYPE_STOR);
1040 static void __exit usb_stor_exit(void)
1042 US_DEBUGP("usb_stor_exit() called\n");
1044 /* Deregister the driver
1045 * This will cause disconnect() to be called for each
1048 US_DEBUGP("-- calling usb_deregister()\n");
1049 usb_deregister(&usb_storage_driver) ;
1051 usb_usual_clear_present(USB_US_TYPE_STOR);
1054 module_init(usb_stor_init);
1055 module_exit(usb_stor_exit);