2 * The low performance USB storage driver (ub).
4 * Copyright (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
5 * Copyright (C) 2004 Pete Zaitcev (zaitcev@yahoo.com)
7 * This work is a part of Linux kernel, is derived from it,
8 * and is not licensed separately. See file COPYING for details.
10 * TODO (sorted by decreasing priority)
11 * -- set readonly flag for CDs, set removable flag for CF readers
12 * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
13 * -- verify the 13 conditions and do bulk resets
15 * -- move top_sense and work_bcs into separate allocations (if they survive)
16 * for cache purists and esoteric architectures.
17 * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ?
18 * -- prune comments, they are too volumnous
20 * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring.
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/usb.h>
25 #include <linux/usb_usual.h>
26 #include <linux/blkdev.h>
27 #include <linux/timer.h>
28 #include <scsi/scsi.h>
35 * The command state machine is the key model for understanding of this driver.
37 * The general rule is that all transitions are done towards the bottom
38 * of the diagram, thus preventing any loops.
40 * An exception to that is how the STAT state is handled. A counter allows it
41 * to be re-entered along the path marked with [C].
47 * ub_scsi_cmd_start fails ->--------------------------------------\
54 * was -EPIPE -->-------------------------------->! CLEAR ! !
57 * was error -->------------------------------------- ! --------->\
59 * /--<-- cmd->dir == NONE ? ! !
66 * ! was -EPIPE -->--------------->! CLR2STS ! ! !
69 * ! ! was error -->---- ! --------->\
70 * ! was error -->--------------------- ! ------------- ! --------->\
73 * \--->+--------+ ! ! !
74 * ! STAT !<--------------------------/ ! !
77 * [C] was -EPIPE -->-----------\ ! !
79 * +<---- len == 0 ! ! !
81 * ! was error -->--------------------------------------!---------->\
83 * +<---- bad CSW ! ! !
84 * +<---- bad tag ! ! !
90 * \------- ! --------------------[C]--------\ ! !
92 * cmd->error---\ +--------+ ! !
93 * ! +--------------->! SENSE !<----------/ !
94 * STAT_FAIL----/ +--------+ !
97 * \--------------------------------\--------------------->! DONE !
102 * This many LUNs per USB device.
103 * Every one of them takes a host, see UB_MAX_HOSTS.
105 #define UB_MAX_LUNS 9
110 #define UB_PARTS_PER_LUN 8
112 #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */
114 #define UB_SENSE_SIZE 18
119 /* command block wrapper */
120 struct bulk_cb_wrap
{
121 __le32 Signature
; /* contains 'USBC' */
122 u32 Tag
; /* unique per command id */
123 __le32 DataTransferLength
; /* size of data */
124 u8 Flags
; /* direction in bit 0 */
126 u8 Length
; /* of of the CDB */
127 u8 CDB
[UB_MAX_CDB_SIZE
]; /* max command */
130 #define US_BULK_CB_WRAP_LEN 31
131 #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */
132 #define US_BULK_FLAG_IN 1
133 #define US_BULK_FLAG_OUT 0
135 /* command status wrapper */
136 struct bulk_cs_wrap
{
137 __le32 Signature
; /* should = 'USBS' */
138 u32 Tag
; /* same as original command */
139 __le32 Residue
; /* amount not transferred */
140 u8 Status
; /* see below */
143 #define US_BULK_CS_WRAP_LEN 13
144 #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
145 #define US_BULK_STAT_OK 0
146 #define US_BULK_STAT_FAIL 1
147 #define US_BULK_STAT_PHASE 2
149 /* bulk-only class specific requests */
150 #define US_BULK_RESET_REQUEST 0xff
151 #define US_BULK_GET_MAX_LUN 0xfe
157 #define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */
158 #define UB_MAX_SECTORS 64
161 * A second is more than enough for a 32K transfer (UB_MAX_SECTORS)
162 * even if a webcam hogs the bus, but some devices need time to spin up.
164 #define UB_URB_TIMEOUT (HZ*2)
165 #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */
166 #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */
167 #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */
170 * An instance of a SCSI command in transit.
172 #define UB_DIR_NONE 0
173 #define UB_DIR_READ 1
174 #define UB_DIR_ILLEGAL2 2
175 #define UB_DIR_WRITE 3
177 #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \
178 (((c)==UB_DIR_READ)? 'r': 'n'))
180 enum ub_scsi_cmd_state
{
181 UB_CMDST_INIT
, /* Initial state */
182 UB_CMDST_CMD
, /* Command submitted */
183 UB_CMDST_DATA
, /* Data phase */
184 UB_CMDST_CLR2STS
, /* Clearing before requesting status */
185 UB_CMDST_STAT
, /* Status phase */
186 UB_CMDST_CLEAR
, /* Clearing a stall (halt, actually) */
187 UB_CMDST_CLRRS
, /* Clearing before retrying status */
188 UB_CMDST_SENSE
, /* Sending Request Sense */
189 UB_CMDST_DONE
/* Final state */
193 unsigned char cdb
[UB_MAX_CDB_SIZE
];
194 unsigned char cdb_len
;
196 unsigned char dir
; /* 0 - none, 1 - read, 3 - write. */
197 enum ub_scsi_cmd_state state
;
199 struct ub_scsi_cmd
*next
;
201 int error
; /* Return code - valid upon done */
202 unsigned int act_len
; /* Return size */
203 unsigned char key
, asc
, ascq
; /* May be valid if error==-EIO */
205 int stat_count
; /* Retries getting status. */
207 unsigned int len
; /* Requested length */
208 unsigned int current_sg
;
209 unsigned int nsg
; /* sgv[nsg] */
210 struct scatterlist sgv
[UB_MAX_REQ_SG
];
213 void (*done
)(struct ub_dev
*, struct ub_scsi_cmd
*);
219 unsigned int current_try
;
220 unsigned int nsg
; /* sgv[nsg] */
221 struct scatterlist sgv
[UB_MAX_REQ_SG
];
227 unsigned long nsec
; /* Linux size - 512 byte sectors */
228 unsigned int bsize
; /* Linux hardsect_size */
229 unsigned int bshift
; /* Shift between 512 and hard sects */
233 * This is a direct take-off from linux/include/completion.h
234 * The difference is that I do not wait on this thing, just poll.
235 * When I want to wait (ub_probe), I just use the stock completion.
237 * Note that INIT_COMPLETION takes no lock. It is correct. But why
238 * in the bloody hell that thing takes struct instead of pointer to struct
239 * is quite beyond me. I just copied it from the stock completion.
241 struct ub_completion
{
246 static inline void ub_init_completion(struct ub_completion
*x
)
249 spin_lock_init(&x
->lock
);
252 #define UB_INIT_COMPLETION(x) ((x).done = 0)
254 static void ub_complete(struct ub_completion
*x
)
258 spin_lock_irqsave(&x
->lock
, flags
);
260 spin_unlock_irqrestore(&x
->lock
, flags
);
263 static int ub_is_completed(struct ub_completion
*x
)
268 spin_lock_irqsave(&x
->lock
, flags
);
270 spin_unlock_irqrestore(&x
->lock
, flags
);
276 struct ub_scsi_cmd_queue
{
278 struct ub_scsi_cmd
*head
, *tail
;
282 * The block device instance (one per LUN).
286 struct list_head link
;
287 struct gendisk
*disk
;
288 int id
; /* Host index */
289 int num
; /* LUN number */
292 int changed
; /* Media was changed */
296 struct ub_request urq
;
298 /* Use Ingo's mempool if or when we have more than one command. */
300 * Currently we never need more than one command for the whole device.
301 * However, giving every LUN a command is a cheap and automatic way
302 * to enforce fairness between them.
305 struct ub_scsi_cmd cmdv
[1];
307 struct ub_capacity capacity
;
311 * The USB device instance.
315 atomic_t poison
; /* The USB device is disconnected */
316 int openc
; /* protected by ub_lock! */
317 /* kref is too implicit for our taste */
318 int reset
; /* Reset is running */
321 struct usb_device
*dev
;
322 struct usb_interface
*intf
;
324 struct list_head luns
;
326 unsigned int send_bulk_pipe
; /* cached pipe values */
327 unsigned int recv_bulk_pipe
;
328 unsigned int send_ctrl_pipe
;
329 unsigned int recv_ctrl_pipe
;
331 struct tasklet_struct tasklet
;
333 struct ub_scsi_cmd_queue cmd_queue
;
334 struct ub_scsi_cmd top_rqs_cmd
; /* REQUEST SENSE */
335 unsigned char top_sense
[UB_SENSE_SIZE
];
337 struct ub_completion work_done
;
339 struct timer_list work_timer
;
340 int last_pipe
; /* What might need clearing */
341 __le32 signature
; /* Learned signature */
342 struct bulk_cb_wrap work_bcb
;
343 struct bulk_cs_wrap work_bcs
;
344 struct usb_ctrlrequest work_cr
;
346 struct work_struct reset_work
;
347 wait_queue_head_t reset_wait
;
354 static void ub_cleanup(struct ub_dev
*sc
);
355 static int ub_request_fn_1(struct ub_lun
*lun
, struct request
*rq
);
356 static void ub_cmd_build_block(struct ub_dev
*sc
, struct ub_lun
*lun
,
357 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
);
358 static void ub_cmd_build_packet(struct ub_dev
*sc
, struct ub_lun
*lun
,
359 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
);
360 static void ub_rw_cmd_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
361 static void ub_end_rq(struct request
*rq
, int uptodate
);
362 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
363 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
);
364 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
365 static void ub_urb_complete(struct urb
*urb
, struct pt_regs
*pt
);
366 static void ub_scsi_action(unsigned long _dev
);
367 static void ub_scsi_dispatch(struct ub_dev
*sc
);
368 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
369 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
370 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
);
371 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
372 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
373 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
374 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
375 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
377 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
);
378 static void ub_reset_enter(struct ub_dev
*sc
, int try);
379 static void ub_reset_task(void *arg
);
380 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
);
381 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
382 struct ub_capacity
*ret
);
383 static int ub_sync_reset(struct ub_dev
*sc
);
384 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
);
385 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
);
389 #ifdef CONFIG_USB_LIBUSUAL
391 #define ub_usb_ids storage_usb_ids
394 static struct usb_device_id ub_usb_ids
[] = {
395 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE
, US_SC_SCSI
, US_PR_BULK
) },
399 MODULE_DEVICE_TABLE(usb
, ub_usb_ids
);
400 #endif /* CONFIG_USB_LIBUSUAL */
403 * Find me a way to identify "next free minor" for add_disk(),
404 * and the array disappears the next day. However, the number of
405 * hosts has something to do with the naming and /proc/partitions.
406 * This has to be thought out in detail before changing.
407 * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure.
409 #define UB_MAX_HOSTS 26
410 static char ub_hostv
[UB_MAX_HOSTS
];
412 #define UB_QLOCK_NUM 5
413 static spinlock_t ub_qlockv
[UB_QLOCK_NUM
];
414 static int ub_qlock_next
= 0;
416 static DEFINE_SPINLOCK(ub_lock
); /* Locks globals and ->openc */
421 * This also stores the host for indexing by minor, which is somewhat dirty.
423 static int ub_id_get(void)
428 spin_lock_irqsave(&ub_lock
, flags
);
429 for (i
= 0; i
< UB_MAX_HOSTS
; i
++) {
430 if (ub_hostv
[i
] == 0) {
432 spin_unlock_irqrestore(&ub_lock
, flags
);
436 spin_unlock_irqrestore(&ub_lock
, flags
);
440 static void ub_id_put(int id
)
444 if (id
< 0 || id
>= UB_MAX_HOSTS
) {
445 printk(KERN_ERR DRV_NAME
": bad host ID %d\n", id
);
449 spin_lock_irqsave(&ub_lock
, flags
);
450 if (ub_hostv
[id
] == 0) {
451 spin_unlock_irqrestore(&ub_lock
, flags
);
452 printk(KERN_ERR DRV_NAME
": freeing free host ID %d\n", id
);
456 spin_unlock_irqrestore(&ub_lock
, flags
);
460 * This is necessitated by the fact that blk_cleanup_queue does not
461 * necesserily destroy the queue. Instead, it may merely decrease q->refcnt.
462 * Since our blk_init_queue() passes a spinlock common with ub_dev,
463 * we have life time issues when ub_cleanup frees ub_dev.
465 static spinlock_t
*ub_next_lock(void)
470 spin_lock_irqsave(&ub_lock
, flags
);
471 ret
= &ub_qlockv
[ub_qlock_next
];
472 ub_qlock_next
= (ub_qlock_next
+ 1) % UB_QLOCK_NUM
;
473 spin_unlock_irqrestore(&ub_lock
, flags
);
478 * Downcount for deallocation. This rides on two assumptions:
479 * - once something is poisoned, its refcount cannot grow
480 * - opens cannot happen at this time (del_gendisk was done)
481 * If the above is true, we can drop the lock, which we need for
482 * blk_cleanup_queue(): the silly thing may attempt to sleep.
483 * [Actually, it never needs to sleep for us, but it calls might_sleep()]
485 static void ub_put(struct ub_dev
*sc
)
489 spin_lock_irqsave(&ub_lock
, flags
);
491 if (sc
->openc
== 0 && atomic_read(&sc
->poison
)) {
492 spin_unlock_irqrestore(&ub_lock
, flags
);
495 spin_unlock_irqrestore(&ub_lock
, flags
);
500 * Final cleanup and deallocation.
502 static void ub_cleanup(struct ub_dev
*sc
)
508 while (!list_empty(&sc
->luns
)) {
510 lun
= list_entry(p
, struct ub_lun
, link
);
513 /* I don't think queue can be NULL. But... Stolen from sx8.c */
514 if ((q
= lun
->disk
->queue
) != NULL
)
515 blk_cleanup_queue(q
);
517 * If we zero disk->private_data BEFORE put_disk, we have
518 * to check for NULL all over the place in open, release,
519 * check_media and revalidate, because the block level
520 * semaphore is well inside the put_disk.
521 * But we cannot zero after the call, because *disk is gone.
522 * The sd.c is blatantly racy in this area.
524 /* disk->private_data = NULL; */
532 usb_set_intfdata(sc
->intf
, NULL
);
533 usb_put_intf(sc
->intf
);
534 usb_put_dev(sc
->dev
);
539 * The "command allocator".
541 static struct ub_scsi_cmd
*ub_get_cmd(struct ub_lun
*lun
)
543 struct ub_scsi_cmd
*ret
;
552 static void ub_put_cmd(struct ub_lun
*lun
, struct ub_scsi_cmd
*cmd
)
554 if (cmd
!= &lun
->cmdv
[0]) {
555 printk(KERN_WARNING
"%s: releasing a foreign cmd %p\n",
560 printk(KERN_WARNING
"%s: releasing a free cmd\n", lun
->name
);
569 static void ub_cmdq_add(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
571 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
573 if (t
->qlen
++ == 0) {
581 if (t
->qlen
> t
->qmax
)
585 static void ub_cmdq_insert(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
587 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
589 if (t
->qlen
++ == 0) {
597 if (t
->qlen
> t
->qmax
)
601 static struct ub_scsi_cmd
*ub_cmdq_pop(struct ub_dev
*sc
)
603 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
604 struct ub_scsi_cmd
*cmd
;
616 #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head)
619 * The request function is our main entry point
622 static void ub_request_fn(request_queue_t
*q
)
624 struct ub_lun
*lun
= q
->queuedata
;
627 while ((rq
= elv_next_request(q
)) != NULL
) {
628 if (ub_request_fn_1(lun
, rq
) != 0) {
635 static int ub_request_fn_1(struct ub_lun
*lun
, struct request
*rq
)
637 struct ub_dev
*sc
= lun
->udev
;
638 struct ub_scsi_cmd
*cmd
;
639 struct ub_request
*urq
;
642 if (atomic_read(&sc
->poison
) || lun
->changed
) {
643 blkdev_dequeue_request(rq
);
648 if (lun
->urq
.rq
!= NULL
)
650 if ((cmd
= ub_get_cmd(lun
)) == NULL
)
652 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
654 blkdev_dequeue_request(rq
);
657 memset(urq
, 0, sizeof(struct ub_request
));
661 * get scatterlist from block layer
663 n_elem
= blk_rq_map_sg(lun
->disk
->queue
, rq
, &urq
->sgv
[0]);
665 /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */
666 printk(KERN_INFO
"%s: failed request map (%d)\n",
670 if (n_elem
> UB_MAX_REQ_SG
) { /* Paranoia */
671 printk(KERN_WARNING
"%s: request with %d segments\n",
676 sc
->sg_stat
[n_elem
< 5 ? n_elem
: 5]++;
678 if (blk_pc_request(rq
)) {
679 ub_cmd_build_packet(sc
, lun
, cmd
, urq
);
681 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
683 cmd
->state
= UB_CMDST_INIT
;
685 cmd
->done
= ub_rw_cmd_done
;
688 cmd
->tag
= sc
->tagcnt
++;
689 if (ub_submit_scsi(sc
, cmd
) != 0)
695 ub_put_cmd(lun
, cmd
);
700 static void ub_cmd_build_block(struct ub_dev
*sc
, struct ub_lun
*lun
,
701 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
703 struct request
*rq
= urq
->rq
;
704 unsigned int block
, nblks
;
706 if (rq_data_dir(rq
) == WRITE
)
707 cmd
->dir
= UB_DIR_WRITE
;
709 cmd
->dir
= UB_DIR_READ
;
712 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
717 * The call to blk_queue_hardsect_size() guarantees that request
718 * is aligned, but it is given in terms of 512 byte units, always.
720 block
= rq
->sector
>> lun
->capacity
.bshift
;
721 nblks
= rq
->nr_sectors
>> lun
->capacity
.bshift
;
723 cmd
->cdb
[0] = (cmd
->dir
== UB_DIR_READ
)? READ_10
: WRITE_10
;
724 /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
725 cmd
->cdb
[2] = block
>> 24;
726 cmd
->cdb
[3] = block
>> 16;
727 cmd
->cdb
[4] = block
>> 8;
729 cmd
->cdb
[7] = nblks
>> 8;
733 cmd
->len
= rq
->nr_sectors
* 512;
736 static void ub_cmd_build_packet(struct ub_dev
*sc
, struct ub_lun
*lun
,
737 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
739 struct request
*rq
= urq
->rq
;
741 if (rq
->data_len
== 0) {
742 cmd
->dir
= UB_DIR_NONE
;
744 if (rq_data_dir(rq
) == WRITE
)
745 cmd
->dir
= UB_DIR_WRITE
;
747 cmd
->dir
= UB_DIR_READ
;
751 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
753 memcpy(&cmd
->cdb
, rq
->cmd
, rq
->cmd_len
);
754 cmd
->cdb_len
= rq
->cmd_len
;
756 cmd
->len
= rq
->data_len
;
759 static void ub_rw_cmd_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
761 struct ub_lun
*lun
= cmd
->lun
;
762 struct ub_request
*urq
= cmd
->back
;
768 if (cmd
->error
== 0) {
771 if (blk_pc_request(rq
)) {
772 if (cmd
->act_len
>= rq
->data_len
)
775 rq
->data_len
-= cmd
->act_len
;
780 if (blk_pc_request(rq
)) {
781 /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
782 memcpy(rq
->sense
, sc
->top_sense
, UB_SENSE_SIZE
);
783 rq
->sense_len
= UB_SENSE_SIZE
;
784 if (sc
->top_sense
[0] != 0)
785 rq
->errors
= SAM_STAT_CHECK_CONDITION
;
787 rq
->errors
= DID_ERROR
<< 16;
789 if (cmd
->error
== -EIO
) {
790 if (ub_rw_cmd_retry(sc
, lun
, urq
, cmd
) == 0)
798 ub_put_cmd(lun
, cmd
);
799 ub_end_rq(rq
, uptodate
);
800 blk_start_queue(lun
->disk
->queue
);
803 static void ub_end_rq(struct request
*rq
, int uptodate
)
805 end_that_request_first(rq
, uptodate
, rq
->hard_nr_sectors
);
806 end_that_request_last(rq
, uptodate
);
809 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
810 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
)
813 if (atomic_read(&sc
->poison
))
816 ub_reset_enter(sc
, urq
->current_try
);
818 if (urq
->current_try
>= 3)
822 /* Remove this if anyone complains of flooding. */
823 printk(KERN_DEBUG
"%s: dir %c len/act %d/%d "
824 "[sense %x %02x %02x] retry %d\n",
825 sc
->name
, UB_DIR_CHAR(cmd
->dir
), cmd
->len
, cmd
->act_len
,
826 cmd
->key
, cmd
->asc
, cmd
->ascq
, urq
->current_try
);
828 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
829 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
831 cmd
->state
= UB_CMDST_INIT
;
833 cmd
->done
= ub_rw_cmd_done
;
836 cmd
->tag
= sc
->tagcnt
++;
839 return ub_submit_scsi(sc
, cmd
);
841 ub_cmdq_add(sc
, cmd
);
847 * Submit a regular SCSI operation (not an auto-sense).
849 * The Iron Law of Good Submit Routine is:
850 * Zero return - callback is done, Nonzero return - callback is not done.
853 * Host is assumed locked.
855 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
858 if (cmd
->state
!= UB_CMDST_INIT
||
859 (cmd
->dir
!= UB_DIR_NONE
&& cmd
->len
== 0)) {
863 ub_cmdq_add(sc
, cmd
);
865 * We can call ub_scsi_dispatch(sc) right away here, but it's a little
866 * safer to jump to a tasklet, in case upper layers do something silly.
868 tasklet_schedule(&sc
->tasklet
);
873 * Submit the first URB for the queued command.
874 * This function does not deal with queueing in any way.
876 static int ub_scsi_cmd_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
878 struct bulk_cb_wrap
*bcb
;
884 * ``If the allocation length is eighteen or greater, and a device
885 * server returns less than eithteen bytes of data, the application
886 * client should assume that the bytes not transferred would have been
887 * zeroes had the device server returned those bytes.''
889 * We zero sense for all commands so that when a packet request
890 * fails it does not return a stale sense.
892 memset(&sc
->top_sense
, 0, UB_SENSE_SIZE
);
894 /* set up the command wrapper */
895 bcb
->Signature
= cpu_to_le32(US_BULK_CB_SIGN
);
896 bcb
->Tag
= cmd
->tag
; /* Endianness is not important */
897 bcb
->DataTransferLength
= cpu_to_le32(cmd
->len
);
898 bcb
->Flags
= (cmd
->dir
== UB_DIR_READ
) ? 0x80 : 0;
899 bcb
->Lun
= (cmd
->lun
!= NULL
) ? cmd
->lun
->num
: 0;
900 bcb
->Length
= cmd
->cdb_len
;
902 /* copy the command payload */
903 memcpy(bcb
->CDB
, cmd
->cdb
, UB_MAX_CDB_SIZE
);
905 UB_INIT_COMPLETION(sc
->work_done
);
907 sc
->last_pipe
= sc
->send_bulk_pipe
;
908 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->send_bulk_pipe
,
909 bcb
, US_BULK_CB_WRAP_LEN
, ub_urb_complete
, sc
);
911 /* Fill what we shouldn't be filling, because usb-storage did so. */
912 sc
->work_urb
.actual_length
= 0;
913 sc
->work_urb
.error_count
= 0;
914 sc
->work_urb
.status
= 0;
916 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
917 /* XXX Clear stalls */
918 ub_complete(&sc
->work_done
);
922 sc
->work_timer
.expires
= jiffies
+ UB_URB_TIMEOUT
;
923 add_timer(&sc
->work_timer
);
925 cmd
->state
= UB_CMDST_CMD
;
932 static void ub_urb_timeout(unsigned long arg
)
934 struct ub_dev
*sc
= (struct ub_dev
*) arg
;
937 spin_lock_irqsave(sc
->lock
, flags
);
938 if (!ub_is_completed(&sc
->work_done
))
939 usb_unlink_urb(&sc
->work_urb
);
940 spin_unlock_irqrestore(sc
->lock
, flags
);
944 * Completion routine for the work URB.
946 * This can be called directly from usb_submit_urb (while we have
947 * the sc->lock taken) and from an interrupt (while we do NOT have
948 * the sc->lock taken). Therefore, bounce this off to a tasklet.
950 static void ub_urb_complete(struct urb
*urb
, struct pt_regs
*pt
)
952 struct ub_dev
*sc
= urb
->context
;
954 ub_complete(&sc
->work_done
);
955 tasklet_schedule(&sc
->tasklet
);
958 static void ub_scsi_action(unsigned long _dev
)
960 struct ub_dev
*sc
= (struct ub_dev
*) _dev
;
963 spin_lock_irqsave(sc
->lock
, flags
);
964 ub_scsi_dispatch(sc
);
965 spin_unlock_irqrestore(sc
->lock
, flags
);
968 static void ub_scsi_dispatch(struct ub_dev
*sc
)
970 struct ub_scsi_cmd
*cmd
;
973 while (!sc
->reset
&& (cmd
= ub_cmdq_peek(sc
)) != NULL
) {
974 if (cmd
->state
== UB_CMDST_DONE
) {
976 (*cmd
->done
)(sc
, cmd
);
977 } else if (cmd
->state
== UB_CMDST_INIT
) {
978 if ((rc
= ub_scsi_cmd_start(sc
, cmd
)) == 0)
981 cmd
->state
= UB_CMDST_DONE
;
983 if (!ub_is_completed(&sc
->work_done
))
985 del_timer(&sc
->work_timer
);
986 ub_scsi_urb_compl(sc
, cmd
);
991 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
993 struct urb
*urb
= &sc
->work_urb
;
994 struct bulk_cs_wrap
*bcs
;
998 if (atomic_read(&sc
->poison
)) {
999 ub_state_done(sc
, cmd
, -ENODEV
);
1003 if (cmd
->state
== UB_CMDST_CLEAR
) {
1004 if (urb
->status
== -EPIPE
) {
1006 * STALL while clearning STALL.
1007 * The control pipe clears itself - nothing to do.
1009 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1015 * We ignore the result for the halt clear.
1018 /* reset the endpoint toggle */
1019 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1020 usb_pipeout(sc
->last_pipe
), 0);
1022 ub_state_sense(sc
, cmd
);
1024 } else if (cmd
->state
== UB_CMDST_CLR2STS
) {
1025 if (urb
->status
== -EPIPE
) {
1026 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1032 * We ignore the result for the halt clear.
1035 /* reset the endpoint toggle */
1036 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1037 usb_pipeout(sc
->last_pipe
), 0);
1039 ub_state_stat(sc
, cmd
);
1041 } else if (cmd
->state
== UB_CMDST_CLRRS
) {
1042 if (urb
->status
== -EPIPE
) {
1043 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1049 * We ignore the result for the halt clear.
1052 /* reset the endpoint toggle */
1053 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1054 usb_pipeout(sc
->last_pipe
), 0);
1056 ub_state_stat_counted(sc
, cmd
);
1058 } else if (cmd
->state
== UB_CMDST_CMD
) {
1059 switch (urb
->status
) {
1065 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1067 printk(KERN_NOTICE
"%s: "
1068 "unable to submit clear (%d)\n",
1071 * This is typically ENOMEM or some other such shit.
1072 * Retrying is pointless. Just do Bad End on it...
1074 ub_state_done(sc
, cmd
, rc
);
1077 cmd
->state
= UB_CMDST_CLEAR
;
1079 case -ESHUTDOWN
: /* unplug */
1080 case -EILSEQ
: /* unplug timeout on uhci */
1081 ub_state_done(sc
, cmd
, -ENODEV
);
1086 if (urb
->actual_length
!= US_BULK_CB_WRAP_LEN
) {
1090 if (cmd
->dir
== UB_DIR_NONE
|| cmd
->nsg
< 1) {
1091 ub_state_stat(sc
, cmd
);
1095 // udelay(125); // usb-storage has this
1096 ub_data_start(sc
, cmd
);
1098 } else if (cmd
->state
== UB_CMDST_DATA
) {
1099 if (urb
->status
== -EPIPE
) {
1100 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1102 printk(KERN_NOTICE
"%s: "
1103 "unable to submit clear (%d)\n",
1105 ub_state_done(sc
, cmd
, rc
);
1108 cmd
->state
= UB_CMDST_CLR2STS
;
1111 if (urb
->status
== -EOVERFLOW
) {
1113 * A babble? Failure, but we must transfer CSW now.
1115 cmd
->error
= -EOVERFLOW
; /* A cheap trick... */
1116 ub_state_stat(sc
, cmd
);
1120 if (cmd
->dir
== UB_DIR_WRITE
) {
1122 * Do not continue writes in case of a failure.
1123 * Doing so would cause sectors to be mixed up,
1124 * which is worse than sectors lost.
1126 * We must try to read the CSW, or many devices
1129 len
= urb
->actual_length
;
1130 if (urb
->status
!= 0 ||
1131 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1132 cmd
->act_len
+= len
;
1135 ub_state_stat(sc
, cmd
);
1141 * If an error occurs on read, we record it, and
1142 * continue to fetch data in order to avoid bubble.
1144 * As a small shortcut, we stop if we detect that
1145 * a CSW mixed into data.
1147 if (urb
->status
!= 0)
1150 len
= urb
->actual_length
;
1151 if (urb
->status
!= 0 ||
1152 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1153 if ((len
& 0x1FF) == US_BULK_CS_WRAP_LEN
)
1158 cmd
->act_len
+= urb
->actual_length
;
1160 if (++cmd
->current_sg
< cmd
->nsg
) {
1161 ub_data_start(sc
, cmd
);
1164 ub_state_stat(sc
, cmd
);
1166 } else if (cmd
->state
== UB_CMDST_STAT
) {
1167 if (urb
->status
== -EPIPE
) {
1168 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1170 printk(KERN_NOTICE
"%s: "
1171 "unable to submit clear (%d)\n",
1173 ub_state_done(sc
, cmd
, rc
);
1178 * Having a stall when getting CSW is an error, so
1179 * make sure uppper levels are not oblivious to it.
1181 cmd
->error
= -EIO
; /* A cheap trick... */
1183 cmd
->state
= UB_CMDST_CLRRS
;
1187 /* Catch everything, including -EOVERFLOW and other nasties. */
1188 if (urb
->status
!= 0)
1191 if (urb
->actual_length
== 0) {
1192 ub_state_stat_counted(sc
, cmd
);
1197 * Check the returned Bulk protocol status.
1198 * The status block has to be validated first.
1201 bcs
= &sc
->work_bcs
;
1203 if (sc
->signature
== cpu_to_le32(0)) {
1205 * This is the first reply, so do not perform the check.
1206 * Instead, remember the signature the device uses
1207 * for future checks. But do not allow a nul.
1209 sc
->signature
= bcs
->Signature
;
1210 if (sc
->signature
== cpu_to_le32(0)) {
1211 ub_state_stat_counted(sc
, cmd
);
1215 if (bcs
->Signature
!= sc
->signature
) {
1216 ub_state_stat_counted(sc
, cmd
);
1221 if (bcs
->Tag
!= cmd
->tag
) {
1223 * This usually happens when we disagree with the
1224 * device's microcode about something. For instance,
1225 * a few of them throw this after timeouts. They buffer
1226 * commands and reply at commands we timed out before.
1227 * Without flushing these replies we loop forever.
1229 ub_state_stat_counted(sc
, cmd
);
1233 len
= le32_to_cpu(bcs
->Residue
);
1234 if (len
!= cmd
->len
- cmd
->act_len
) {
1236 * It is all right to transfer less, the caller has
1237 * to check. But it's not all right if the device
1238 * counts disagree with our counts.
1243 switch (bcs
->Status
) {
1244 case US_BULK_STAT_OK
:
1246 case US_BULK_STAT_FAIL
:
1247 ub_state_sense(sc
, cmd
);
1249 case US_BULK_STAT_PHASE
:
1252 printk(KERN_INFO
"%s: unknown CSW status 0x%x\n",
1253 sc
->name
, bcs
->Status
);
1254 ub_state_done(sc
, cmd
, -EINVAL
);
1258 /* Not zeroing error to preserve a babble indicator */
1259 if (cmd
->error
!= 0) {
1260 ub_state_sense(sc
, cmd
);
1263 cmd
->state
= UB_CMDST_DONE
;
1265 (*cmd
->done
)(sc
, cmd
);
1267 } else if (cmd
->state
== UB_CMDST_SENSE
) {
1268 ub_state_done(sc
, cmd
, -EIO
);
1271 printk(KERN_WARNING
"%s: "
1272 "wrong command state %d\n",
1273 sc
->name
, cmd
->state
);
1274 ub_state_done(sc
, cmd
, -EINVAL
);
1279 Bad_End
: /* Little Excel is dead */
1280 ub_state_done(sc
, cmd
, -EIO
);
1284 * Factorization helper for the command state machine:
1285 * Initiate a data segment transfer.
1287 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1289 struct scatterlist
*sg
= &cmd
->sgv
[cmd
->current_sg
];
1293 UB_INIT_COMPLETION(sc
->work_done
);
1295 if (cmd
->dir
== UB_DIR_READ
)
1296 pipe
= sc
->recv_bulk_pipe
;
1298 pipe
= sc
->send_bulk_pipe
;
1299 sc
->last_pipe
= pipe
;
1300 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, pipe
,
1301 page_address(sg
->page
) + sg
->offset
, sg
->length
,
1302 ub_urb_complete
, sc
);
1303 sc
->work_urb
.actual_length
= 0;
1304 sc
->work_urb
.error_count
= 0;
1305 sc
->work_urb
.status
= 0;
1307 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1308 /* XXX Clear stalls */
1309 ub_complete(&sc
->work_done
);
1310 ub_state_done(sc
, cmd
, rc
);
1314 sc
->work_timer
.expires
= jiffies
+ UB_DATA_TIMEOUT
;
1315 add_timer(&sc
->work_timer
);
1317 cmd
->state
= UB_CMDST_DATA
;
1321 * Factorization helper for the command state machine:
1322 * Finish the command.
1324 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
)
1328 cmd
->state
= UB_CMDST_DONE
;
1330 (*cmd
->done
)(sc
, cmd
);
1334 * Factorization helper for the command state machine:
1335 * Submit a CSW read.
1337 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1341 UB_INIT_COMPLETION(sc
->work_done
);
1343 sc
->last_pipe
= sc
->recv_bulk_pipe
;
1344 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_bulk_pipe
,
1345 &sc
->work_bcs
, US_BULK_CS_WRAP_LEN
, ub_urb_complete
, sc
);
1346 sc
->work_urb
.actual_length
= 0;
1347 sc
->work_urb
.error_count
= 0;
1348 sc
->work_urb
.status
= 0;
1350 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1351 /* XXX Clear stalls */
1352 ub_complete(&sc
->work_done
);
1353 ub_state_done(sc
, cmd
, rc
);
1357 sc
->work_timer
.expires
= jiffies
+ UB_STAT_TIMEOUT
;
1358 add_timer(&sc
->work_timer
);
1363 * Factorization helper for the command state machine:
1364 * Submit a CSW read and go to STAT state.
1366 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1369 if (__ub_state_stat(sc
, cmd
) != 0)
1372 cmd
->stat_count
= 0;
1373 cmd
->state
= UB_CMDST_STAT
;
1377 * Factorization helper for the command state machine:
1378 * Submit a CSW read and go to STAT state with counter (along [C] path).
1380 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1383 if (++cmd
->stat_count
>= 4) {
1384 ub_state_sense(sc
, cmd
);
1388 if (__ub_state_stat(sc
, cmd
) != 0)
1391 cmd
->state
= UB_CMDST_STAT
;
1395 * Factorization helper for the command state machine:
1396 * Submit a REQUEST SENSE and go to SENSE state.
1398 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1400 struct ub_scsi_cmd
*scmd
;
1401 struct scatterlist
*sg
;
1404 if (cmd
->cdb
[0] == REQUEST_SENSE
) {
1409 scmd
= &sc
->top_rqs_cmd
;
1410 memset(scmd
, 0, sizeof(struct ub_scsi_cmd
));
1411 scmd
->cdb
[0] = REQUEST_SENSE
;
1412 scmd
->cdb
[4] = UB_SENSE_SIZE
;
1414 scmd
->dir
= UB_DIR_READ
;
1415 scmd
->state
= UB_CMDST_INIT
;
1418 sg
->page
= virt_to_page(sc
->top_sense
);
1419 sg
->offset
= (unsigned long)sc
->top_sense
& (PAGE_SIZE
-1);
1420 sg
->length
= UB_SENSE_SIZE
;
1421 scmd
->len
= UB_SENSE_SIZE
;
1422 scmd
->lun
= cmd
->lun
;
1423 scmd
->done
= ub_top_sense_done
;
1426 scmd
->tag
= sc
->tagcnt
++;
1428 cmd
->state
= UB_CMDST_SENSE
;
1430 ub_cmdq_insert(sc
, scmd
);
1434 ub_state_done(sc
, cmd
, rc
);
1438 * A helper for the command's state machine:
1439 * Submit a stall clear.
1441 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
1445 struct usb_ctrlrequest
*cr
;
1448 endp
= usb_pipeendpoint(stalled_pipe
);
1449 if (usb_pipein (stalled_pipe
))
1453 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
1454 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
1455 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
1456 cr
->wIndex
= cpu_to_le16(endp
);
1457 cr
->wLength
= cpu_to_le16(0);
1459 UB_INIT_COMPLETION(sc
->work_done
);
1461 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1462 (unsigned char*) cr
, NULL
, 0, ub_urb_complete
, sc
);
1463 sc
->work_urb
.actual_length
= 0;
1464 sc
->work_urb
.error_count
= 0;
1465 sc
->work_urb
.status
= 0;
1467 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1468 ub_complete(&sc
->work_done
);
1472 sc
->work_timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1473 add_timer(&sc
->work_timer
);
1479 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
)
1481 unsigned char *sense
= sc
->top_sense
;
1482 struct ub_scsi_cmd
*cmd
;
1485 * Find the command which triggered the unit attention or a check,
1486 * save the sense into it, and advance its state machine.
1488 if ((cmd
= ub_cmdq_peek(sc
)) == NULL
) {
1489 printk(KERN_WARNING
"%s: sense done while idle\n", sc
->name
);
1492 if (cmd
!= scmd
->back
) {
1493 printk(KERN_WARNING
"%s: "
1494 "sense done for wrong command 0x%x\n",
1495 sc
->name
, cmd
->tag
);
1498 if (cmd
->state
!= UB_CMDST_SENSE
) {
1499 printk(KERN_WARNING
"%s: "
1500 "sense done with bad cmd state %d\n",
1501 sc
->name
, cmd
->state
);
1506 * Ignoring scmd->act_len, because the buffer was pre-zeroed.
1508 cmd
->key
= sense
[2] & 0x0F;
1509 cmd
->asc
= sense
[12];
1510 cmd
->ascq
= sense
[13];
1512 ub_scsi_urb_compl(sc
, cmd
);
1517 * XXX Move usb_reset_device to khubd. Hogging kevent is not a good thing.
1518 * XXX Make usb_sync_reset asynchronous.
1521 static void ub_reset_enter(struct ub_dev
*sc
, int try)
1525 /* This happens often on multi-LUN devices. */
1528 sc
->reset
= try + 1;
1530 #if 0 /* Not needed because the disconnect waits for us. */
1531 unsigned long flags
;
1532 spin_lock_irqsave(&ub_lock
, flags
);
1534 spin_unlock_irqrestore(&ub_lock
, flags
);
1537 #if 0 /* We let them stop themselves. */
1538 struct list_head
*p
;
1540 list_for_each(p
, &sc
->luns
) {
1541 lun
= list_entry(p
, struct ub_lun
, link
);
1542 blk_stop_queue(lun
->disk
->queue
);
1546 schedule_work(&sc
->reset_work
);
1549 static void ub_reset_task(void *arg
)
1551 struct ub_dev
*sc
= arg
;
1552 unsigned long flags
;
1553 struct list_head
*p
;
1558 printk(KERN_WARNING
"%s: Running reset unrequested\n",
1563 if (atomic_read(&sc
->poison
)) {
1565 } else if ((sc
->reset
& 1) == 0) {
1567 msleep(700); /* usb-storage sleeps 6s (!) */
1568 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
1569 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
1570 } else if (sc
->dev
->actconfig
->desc
.bNumInterfaces
!= 1) {
1573 if ((lkr
= usb_lock_device_for_reset(sc
->dev
, sc
->intf
)) < 0) {
1575 "%s: usb_lock_device_for_reset failed (%d)\n",
1578 rc
= usb_reset_device(sc
->dev
);
1580 printk(KERN_NOTICE
"%s: "
1581 "usb_lock_device_for_reset failed (%d)\n",
1586 usb_unlock_device(sc
->dev
);
1591 * In theory, no commands can be running while reset is active,
1592 * so nobody can ask for another reset, and so we do not need any
1593 * queues of resets or anything. We do need a spinlock though,
1594 * to interact with block layer.
1596 spin_lock_irqsave(sc
->lock
, flags
);
1598 tasklet_schedule(&sc
->tasklet
);
1599 list_for_each(p
, &sc
->luns
) {
1600 lun
= list_entry(p
, struct ub_lun
, link
);
1601 blk_start_queue(lun
->disk
->queue
);
1603 wake_up(&sc
->reset_wait
);
1604 spin_unlock_irqrestore(sc
->lock
, flags
);
1608 * This is called from a process context.
1610 static void ub_revalidate(struct ub_dev
*sc
, struct ub_lun
*lun
)
1613 lun
->readonly
= 0; /* XXX Query this from the device */
1615 lun
->capacity
.nsec
= 0;
1616 lun
->capacity
.bsize
= 512;
1617 lun
->capacity
.bshift
= 0;
1619 if (ub_sync_tur(sc
, lun
) != 0)
1620 return; /* Not ready */
1623 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1625 * The retry here means something is wrong, either with the
1626 * device, with the transport, or with our code.
1627 * We keep this because sd.c has retries for capacity.
1629 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1630 lun
->capacity
.nsec
= 0;
1631 lun
->capacity
.bsize
= 512;
1632 lun
->capacity
.bshift
= 0;
1639 * This is mostly needed to keep refcounting, but also to support
1640 * media checks on removable media drives.
1642 static int ub_bd_open(struct inode
*inode
, struct file
*filp
)
1644 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1645 struct ub_lun
*lun
= disk
->private_data
;
1646 struct ub_dev
*sc
= lun
->udev
;
1647 unsigned long flags
;
1650 spin_lock_irqsave(&ub_lock
, flags
);
1651 if (atomic_read(&sc
->poison
)) {
1652 spin_unlock_irqrestore(&ub_lock
, flags
);
1656 spin_unlock_irqrestore(&ub_lock
, flags
);
1658 if (lun
->removable
|| lun
->readonly
)
1659 check_disk_change(inode
->i_bdev
);
1662 * The sd.c considers ->media_present and ->changed not equivalent,
1663 * under some pretty murky conditions (a failure of READ CAPACITY).
1664 * We may need it one day.
1666 if (lun
->removable
&& lun
->changed
&& !(filp
->f_flags
& O_NDELAY
)) {
1671 if (lun
->readonly
&& (filp
->f_mode
& FMODE_WRITE
)) {
1685 static int ub_bd_release(struct inode
*inode
, struct file
*filp
)
1687 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1688 struct ub_lun
*lun
= disk
->private_data
;
1689 struct ub_dev
*sc
= lun
->udev
;
1696 * The ioctl interface.
1698 static int ub_bd_ioctl(struct inode
*inode
, struct file
*filp
,
1699 unsigned int cmd
, unsigned long arg
)
1701 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1702 void __user
*usermem
= (void __user
*) arg
;
1704 return scsi_cmd_ioctl(filp
, disk
, cmd
, usermem
);
1708 * This is called once a new disk was seen by the block layer or by ub_probe().
1709 * The main onjective here is to discover the features of the media such as
1710 * the capacity, read-only status, etc. USB storage generally does not
1711 * need to be spun up, but if we needed it, this would be the place.
1713 * This call can sleep.
1715 * The return code is not used.
1717 static int ub_bd_revalidate(struct gendisk
*disk
)
1719 struct ub_lun
*lun
= disk
->private_data
;
1721 ub_revalidate(lun
->udev
, lun
);
1723 /* XXX Support sector size switching like in sr.c */
1724 blk_queue_hardsect_size(disk
->queue
, lun
->capacity
.bsize
);
1725 set_capacity(disk
, lun
->capacity
.nsec
);
1726 // set_disk_ro(sdkp->disk, lun->readonly);
1732 * The check is called by the block layer to verify if the media
1733 * is still available. It is supposed to be harmless, lightweight and
1734 * non-intrusive in case the media was not changed.
1736 * This call can sleep.
1738 * The return code is bool!
1740 static int ub_bd_media_changed(struct gendisk
*disk
)
1742 struct ub_lun
*lun
= disk
->private_data
;
1744 if (!lun
->removable
)
1748 * We clean checks always after every command, so this is not
1749 * as dangerous as it looks. If the TEST_UNIT_READY fails here,
1750 * the device is actually not ready with operator or software
1751 * intervention required. One dangerous item might be a drive which
1752 * spins itself down, and come the time to write dirty pages, this
1753 * will fail, then block layer discards the data. Since we never
1754 * spin drives up, such devices simply cannot be used with ub anyway.
1756 if (ub_sync_tur(lun
->udev
, lun
) != 0) {
1761 return lun
->changed
;
1764 static struct block_device_operations ub_bd_fops
= {
1765 .owner
= THIS_MODULE
,
1767 .release
= ub_bd_release
,
1768 .ioctl
= ub_bd_ioctl
,
1769 .media_changed
= ub_bd_media_changed
,
1770 .revalidate_disk
= ub_bd_revalidate
,
1774 * Common ->done routine for commands executed synchronously.
1776 static void ub_probe_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1778 struct completion
*cop
= cmd
->back
;
1783 * Test if the device has a check condition on it, synchronously.
1785 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
)
1787 struct ub_scsi_cmd
*cmd
;
1788 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) };
1789 unsigned long flags
;
1790 struct completion
compl;
1793 init_completion(&compl);
1796 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1799 cmd
->cdb
[0] = TEST_UNIT_READY
;
1801 cmd
->dir
= UB_DIR_NONE
;
1802 cmd
->state
= UB_CMDST_INIT
;
1803 cmd
->lun
= lun
; /* This may be NULL, but that's ok */
1804 cmd
->done
= ub_probe_done
;
1807 spin_lock_irqsave(sc
->lock
, flags
);
1808 cmd
->tag
= sc
->tagcnt
++;
1810 rc
= ub_submit_scsi(sc
, cmd
);
1811 spin_unlock_irqrestore(sc
->lock
, flags
);
1816 wait_for_completion(&compl);
1820 if (rc
== -EIO
&& cmd
->key
!= 0) /* Retries for benh's key */
1830 * Read the SCSI capacity synchronously (for probing).
1832 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
1833 struct ub_capacity
*ret
)
1835 struct ub_scsi_cmd
*cmd
;
1836 struct scatterlist
*sg
;
1838 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) + 8 };
1839 unsigned long flags
;
1840 unsigned int bsize
, shift
;
1842 struct completion
compl;
1845 init_completion(&compl);
1848 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1850 p
= (char *)cmd
+ sizeof(struct ub_scsi_cmd
);
1854 cmd
->dir
= UB_DIR_READ
;
1855 cmd
->state
= UB_CMDST_INIT
;
1858 sg
->page
= virt_to_page(p
);
1859 sg
->offset
= (unsigned long)p
& (PAGE_SIZE
-1);
1863 cmd
->done
= ub_probe_done
;
1866 spin_lock_irqsave(sc
->lock
, flags
);
1867 cmd
->tag
= sc
->tagcnt
++;
1869 rc
= ub_submit_scsi(sc
, cmd
);
1870 spin_unlock_irqrestore(sc
->lock
, flags
);
1875 wait_for_completion(&compl);
1877 if (cmd
->error
!= 0) {
1881 if (cmd
->act_len
!= 8) {
1886 /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */
1887 nsec
= be32_to_cpu(*(__be32
*)p
) + 1;
1888 bsize
= be32_to_cpu(*(__be32
*)(p
+ 4));
1890 case 512: shift
= 0; break;
1891 case 1024: shift
= 1; break;
1892 case 2048: shift
= 2; break;
1893 case 4096: shift
= 3; break;
1900 ret
->bshift
= shift
;
1901 ret
->nsec
= nsec
<< shift
;
1914 static void ub_probe_urb_complete(struct urb
*urb
, struct pt_regs
*pt
)
1916 struct completion
*cop
= urb
->context
;
1920 static void ub_probe_timeout(unsigned long arg
)
1922 struct completion
*cop
= (struct completion
*) arg
;
1927 * Reset with a Bulk reset.
1929 static int ub_sync_reset(struct ub_dev
*sc
)
1931 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
1932 struct usb_ctrlrequest
*cr
;
1933 struct completion
compl;
1934 struct timer_list timer
;
1937 init_completion(&compl);
1940 cr
->bRequestType
= USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
1941 cr
->bRequest
= US_BULK_RESET_REQUEST
;
1942 cr
->wValue
= cpu_to_le16(0);
1943 cr
->wIndex
= cpu_to_le16(ifnum
);
1944 cr
->wLength
= cpu_to_le16(0);
1946 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1947 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
1948 sc
->work_urb
.actual_length
= 0;
1949 sc
->work_urb
.error_count
= 0;
1950 sc
->work_urb
.status
= 0;
1952 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
1954 "%s: Unable to submit a bulk reset (%d)\n", sc
->name
, rc
);
1959 timer
.function
= ub_probe_timeout
;
1960 timer
.data
= (unsigned long) &compl;
1961 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1964 wait_for_completion(&compl);
1966 del_timer_sync(&timer
);
1967 usb_kill_urb(&sc
->work_urb
);
1969 return sc
->work_urb
.status
;
1973 * Get number of LUNs by the way of Bulk GetMaxLUN command.
1975 static int ub_sync_getmaxlun(struct ub_dev
*sc
)
1977 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
1979 enum { ALLOC_SIZE
= 1 };
1980 struct usb_ctrlrequest
*cr
;
1981 struct completion
compl;
1982 struct timer_list timer
;
1986 init_completion(&compl);
1989 if ((p
= kmalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1994 cr
->bRequestType
= USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
1995 cr
->bRequest
= US_BULK_GET_MAX_LUN
;
1996 cr
->wValue
= cpu_to_le16(0);
1997 cr
->wIndex
= cpu_to_le16(ifnum
);
1998 cr
->wLength
= cpu_to_le16(1);
2000 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_ctrl_pipe
,
2001 (unsigned char*) cr
, p
, 1, ub_probe_urb_complete
, &compl);
2002 sc
->work_urb
.actual_length
= 0;
2003 sc
->work_urb
.error_count
= 0;
2004 sc
->work_urb
.status
= 0;
2006 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0)
2010 timer
.function
= ub_probe_timeout
;
2011 timer
.data
= (unsigned long) &compl;
2012 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2015 wait_for_completion(&compl);
2017 del_timer_sync(&timer
);
2018 usb_kill_urb(&sc
->work_urb
);
2020 if ((rc
= sc
->work_urb
.status
) < 0)
2023 if (sc
->work_urb
.actual_length
!= 1) {
2026 if ((nluns
= *p
) == 55) {
2029 /* GetMaxLUN returns the maximum LUN number */
2031 if (nluns
> UB_MAX_LUNS
)
2032 nluns
= UB_MAX_LUNS
;
2047 * Clear initial stalls.
2049 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
)
2052 struct usb_ctrlrequest
*cr
;
2053 struct completion
compl;
2054 struct timer_list timer
;
2057 init_completion(&compl);
2059 endp
= usb_pipeendpoint(stalled_pipe
);
2060 if (usb_pipein (stalled_pipe
))
2064 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
2065 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
2066 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
2067 cr
->wIndex
= cpu_to_le16(endp
);
2068 cr
->wLength
= cpu_to_le16(0);
2070 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
2071 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
2072 sc
->work_urb
.actual_length
= 0;
2073 sc
->work_urb
.error_count
= 0;
2074 sc
->work_urb
.status
= 0;
2076 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
2078 "%s: Unable to submit a probe clear (%d)\n", sc
->name
, rc
);
2083 timer
.function
= ub_probe_timeout
;
2084 timer
.data
= (unsigned long) &compl;
2085 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2088 wait_for_completion(&compl);
2090 del_timer_sync(&timer
);
2091 usb_kill_urb(&sc
->work_urb
);
2093 /* reset the endpoint toggle */
2094 usb_settoggle(sc
->dev
, endp
, usb_pipeout(sc
->last_pipe
), 0);
2100 * Get the pipe settings.
2102 static int ub_get_pipes(struct ub_dev
*sc
, struct usb_device
*dev
,
2103 struct usb_interface
*intf
)
2105 struct usb_host_interface
*altsetting
= intf
->cur_altsetting
;
2106 struct usb_endpoint_descriptor
*ep_in
= NULL
;
2107 struct usb_endpoint_descriptor
*ep_out
= NULL
;
2108 struct usb_endpoint_descriptor
*ep
;
2112 * Find the endpoints we need.
2113 * We are expecting a minimum of 2 endpoints - in and out (bulk).
2114 * We will ignore any others.
2116 for (i
= 0; i
< altsetting
->desc
.bNumEndpoints
; i
++) {
2117 ep
= &altsetting
->endpoint
[i
].desc
;
2119 /* Is it a BULK endpoint? */
2120 if ((ep
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
2121 == USB_ENDPOINT_XFER_BULK
) {
2122 /* BULK in or out? */
2123 if (ep
->bEndpointAddress
& USB_DIR_IN
)
2130 if (ep_in
== NULL
|| ep_out
== NULL
) {
2131 printk(KERN_NOTICE
"%s: failed endpoint check\n",
2136 /* Calculate and store the pipe values */
2137 sc
->send_ctrl_pipe
= usb_sndctrlpipe(dev
, 0);
2138 sc
->recv_ctrl_pipe
= usb_rcvctrlpipe(dev
, 0);
2139 sc
->send_bulk_pipe
= usb_sndbulkpipe(dev
,
2140 ep_out
->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
2141 sc
->recv_bulk_pipe
= usb_rcvbulkpipe(dev
,
2142 ep_in
->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
2148 * Probing is done in the process context, which allows us to cheat
2149 * and not to build a state machine for the discovery.
2151 static int ub_probe(struct usb_interface
*intf
,
2152 const struct usb_device_id
*dev_id
)
2159 if (usb_usual_check_type(dev_id
, USB_US_TYPE_UB
))
2163 if ((sc
= kzalloc(sizeof(struct ub_dev
), GFP_KERNEL
)) == NULL
)
2165 sc
->lock
= ub_next_lock();
2166 INIT_LIST_HEAD(&sc
->luns
);
2167 usb_init_urb(&sc
->work_urb
);
2168 tasklet_init(&sc
->tasklet
, ub_scsi_action
, (unsigned long)sc
);
2169 atomic_set(&sc
->poison
, 0);
2170 INIT_WORK(&sc
->reset_work
, ub_reset_task
, sc
);
2171 init_waitqueue_head(&sc
->reset_wait
);
2173 init_timer(&sc
->work_timer
);
2174 sc
->work_timer
.data
= (unsigned long) sc
;
2175 sc
->work_timer
.function
= ub_urb_timeout
;
2177 ub_init_completion(&sc
->work_done
);
2178 sc
->work_done
.done
= 1; /* A little yuk, but oh well... */
2180 sc
->dev
= interface_to_usbdev(intf
);
2182 // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2183 usb_set_intfdata(intf
, sc
);
2184 usb_get_dev(sc
->dev
);
2186 * Since we give the interface struct to the block level through
2187 * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent
2188 * oopses on close after a disconnect (kernels 2.6.16 and up).
2190 usb_get_intf(sc
->intf
);
2192 snprintf(sc
->name
, 12, DRV_NAME
"(%d.%d)",
2193 sc
->dev
->bus
->busnum
, sc
->dev
->devnum
);
2195 /* XXX Verify that we can handle the device (from descriptors) */
2197 if (ub_get_pipes(sc
, sc
->dev
, intf
) != 0)
2201 * At this point, all USB initialization is done, do upper layer.
2202 * We really hate halfway initialized structures, so from the
2203 * invariants perspective, this ub_dev is fully constructed at
2208 * This is needed to clear toggles. It is a problem only if we do
2209 * `rmmod ub && modprobe ub` without disconnects, but we like that.
2211 #if 0 /* iPod Mini fails if we do this (big white iPod works) */
2212 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
2213 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
2217 * The way this is used by the startup code is a little specific.
2218 * A SCSI check causes a USB stall. Our common case code sees it
2219 * and clears the check, after which the device is ready for use.
2220 * But if a check was not present, any command other than
2221 * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE).
2223 * If we neglect to clear the SCSI check, the first real command fails
2224 * (which is the capacity readout). We clear that and retry, but why
2225 * causing spurious retries for no reason.
2227 * Revalidation may start with its own TEST_UNIT_READY, but that one
2228 * has to succeed, so we clear checks with an additional one here.
2229 * In any case it's not our business how revaliadation is implemented.
2231 for (i
= 0; i
< 3; i
++) { /* Retries for the schwag key from KS'04 */
2232 if ((rc
= ub_sync_tur(sc
, NULL
)) <= 0) break;
2233 if (rc
!= 0x6) break;
2238 for (i
= 0; i
< 3; i
++) {
2239 if ((rc
= ub_sync_getmaxlun(sc
)) < 0)
2248 for (i
= 0; i
< nluns
; i
++) {
2249 ub_probe_lun(sc
, i
);
2254 usb_set_intfdata(intf
, NULL
);
2255 usb_put_intf(sc
->intf
);
2256 usb_put_dev(sc
->dev
);
2262 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
)
2266 struct gendisk
*disk
;
2270 if ((lun
= kzalloc(sizeof(struct ub_lun
), GFP_KERNEL
)) == NULL
)
2275 if ((lun
->id
= ub_id_get()) == -1)
2280 snprintf(lun
->name
, 16, DRV_NAME
"%c(%d.%d.%d)",
2281 lun
->id
+ 'a', sc
->dev
->bus
->busnum
, sc
->dev
->devnum
, lun
->num
);
2283 lun
->removable
= 1; /* XXX Query this from the device */
2284 lun
->changed
= 1; /* ub_revalidate clears only */
2285 ub_revalidate(sc
, lun
);
2288 if ((disk
= alloc_disk(UB_PARTS_PER_LUN
)) == NULL
)
2291 sprintf(disk
->disk_name
, DRV_NAME
"%c", lun
->id
+ 'a');
2292 disk
->major
= UB_MAJOR
;
2293 disk
->first_minor
= lun
->id
* UB_PARTS_PER_LUN
;
2294 disk
->fops
= &ub_bd_fops
;
2295 disk
->private_data
= lun
;
2296 disk
->driverfs_dev
= &sc
->intf
->dev
;
2299 if ((q
= blk_init_queue(ub_request_fn
, sc
->lock
)) == NULL
)
2304 blk_queue_bounce_limit(q
, BLK_BOUNCE_HIGH
);
2305 blk_queue_max_hw_segments(q
, UB_MAX_REQ_SG
);
2306 blk_queue_max_phys_segments(q
, UB_MAX_REQ_SG
);
2307 blk_queue_segment_boundary(q
, 0xffffffff); /* Dubious. */
2308 blk_queue_max_sectors(q
, UB_MAX_SECTORS
);
2309 blk_queue_hardsect_size(q
, lun
->capacity
.bsize
);
2313 list_add(&lun
->link
, &sc
->luns
);
2315 set_capacity(disk
, lun
->capacity
.nsec
);
2317 disk
->flags
|= GENHD_FL_REMOVABLE
;
2333 static void ub_disconnect(struct usb_interface
*intf
)
2335 struct ub_dev
*sc
= usb_get_intfdata(intf
);
2336 struct list_head
*p
;
2338 unsigned long flags
;
2341 * Prevent ub_bd_release from pulling the rug from under us.
2342 * XXX This is starting to look like a kref.
2343 * XXX Why not to take this ref at probe time?
2345 spin_lock_irqsave(&ub_lock
, flags
);
2347 spin_unlock_irqrestore(&ub_lock
, flags
);
2350 * Fence stall clearnings, operations triggered by unlinkings and so on.
2351 * We do not attempt to unlink any URBs, because we do not trust the
2352 * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway.
2354 atomic_set(&sc
->poison
, 1);
2357 * Wait for reset to end, if any.
2359 wait_event(sc
->reset_wait
, !sc
->reset
);
2362 * Blow away queued commands.
2364 * Actually, this never works, because before we get here
2365 * the HCD terminates outstanding URB(s). It causes our
2366 * SCSI command queue to advance, commands fail to submit,
2367 * and the whole queue drains. So, we just use this code to
2370 spin_lock_irqsave(sc
->lock
, flags
);
2372 struct ub_scsi_cmd
*cmd
;
2374 while ((cmd
= ub_cmdq_peek(sc
)) != NULL
) {
2375 cmd
->error
= -ENOTCONN
;
2376 cmd
->state
= UB_CMDST_DONE
;
2378 (*cmd
->done
)(sc
, cmd
);
2382 printk(KERN_WARNING
"%s: "
2383 "%d was queued after shutdown\n", sc
->name
, cnt
);
2386 spin_unlock_irqrestore(sc
->lock
, flags
);
2389 * Unregister the upper layer.
2391 list_for_each (p
, &sc
->luns
) {
2392 lun
= list_entry(p
, struct ub_lun
, link
);
2393 del_gendisk(lun
->disk
);
2395 * I wish I could do:
2396 * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags);
2397 * As it is, we rely on our internal poisoning and let
2398 * the upper levels to spin furiously failing all the I/O.
2403 * Testing for -EINPROGRESS is always a bug, so we are bending
2404 * the rules a little.
2406 spin_lock_irqsave(sc
->lock
, flags
);
2407 if (sc
->work_urb
.status
== -EINPROGRESS
) { /* janitors: ignore */
2408 printk(KERN_WARNING
"%s: "
2409 "URB is active after disconnect\n", sc
->name
);
2411 spin_unlock_irqrestore(sc
->lock
, flags
);
2414 * There is virtually no chance that other CPU runs times so long
2415 * after ub_urb_complete should have called del_timer, but only if HCD
2416 * didn't forget to deliver a callback on unlink.
2418 del_timer_sync(&sc
->work_timer
);
2421 * At this point there must be no commands coming from anyone
2422 * and no URBs left in transit.
2428 static struct usb_driver ub_driver
= {
2431 .disconnect
= ub_disconnect
,
2432 .id_table
= ub_usb_ids
,
2435 static int __init
ub_init(void)
2440 for (i
= 0; i
< UB_QLOCK_NUM
; i
++)
2441 spin_lock_init(&ub_qlockv
[i
]);
2443 if ((rc
= register_blkdev(UB_MAJOR
, DRV_NAME
)) != 0)
2446 if ((rc
= usb_register(&ub_driver
)) != 0)
2449 usb_usual_set_present(USB_US_TYPE_UB
);
2453 unregister_blkdev(UB_MAJOR
, DRV_NAME
);
2458 static void __exit
ub_exit(void)
2460 usb_deregister(&ub_driver
);
2462 unregister_blkdev(UB_MAJOR
, DRV_NAME
);
2463 usb_usual_clear_present(USB_US_TYPE_UB
);
2466 module_init(ub_init
);
2467 module_exit(ub_exit
);
2469 MODULE_LICENSE("GPL");