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 * -- Return sense now that rq allows it (we always auto-sense anyway).
12 * -- set readonly flag for CDs, set removable flag for CF readers
13 * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
14 * -- verify the 13 conditions and do bulk resets
16 * -- move top_sense and work_bcs into separate allocations (if they survive)
17 * for cache purists and esoteric architectures.
18 * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ?
19 * -- prune comments, they are too volumnous
21 * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring.
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/usb.h>
26 #include <linux/usb_usual.h>
27 #include <linux/blkdev.h>
28 #include <linux/timer.h>
29 #include <linux/scatterlist.h>
30 #include <scsi/scsi.h>
37 * The command state machine is the key model for understanding of this driver.
39 * The general rule is that all transitions are done towards the bottom
40 * of the diagram, thus preventing any loops.
42 * An exception to that is how the STAT state is handled. A counter allows it
43 * to be re-entered along the path marked with [C].
49 * ub_scsi_cmd_start fails ->--------------------------------------\
56 * was -EPIPE -->-------------------------------->! CLEAR ! !
59 * was error -->------------------------------------- ! --------->\
61 * /--<-- cmd->dir == NONE ? ! !
68 * ! was -EPIPE -->--------------->! CLR2STS ! ! !
71 * ! ! was error -->---- ! --------->\
72 * ! was error -->--------------------- ! ------------- ! --------->\
75 * \--->+--------+ ! ! !
76 * ! STAT !<--------------------------/ ! !
79 * [C] was -EPIPE -->-----------\ ! !
81 * +<---- len == 0 ! ! !
83 * ! was error -->--------------------------------------!---------->\
85 * +<---- bad CSW ! ! !
86 * +<---- bad tag ! ! !
92 * \------- ! --------------------[C]--------\ ! !
94 * cmd->error---\ +--------+ ! !
95 * ! +--------------->! SENSE !<----------/ !
96 * STAT_FAIL----/ +--------+ !
99 * \--------------------------------\--------------------->! DONE !
104 * This many LUNs per USB device.
105 * Every one of them takes a host, see UB_MAX_HOSTS.
107 #define UB_MAX_LUNS 9
112 #define UB_PARTS_PER_LUN 8
114 #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */
116 #define UB_SENSE_SIZE 18
121 /* command block wrapper */
122 struct bulk_cb_wrap
{
123 __le32 Signature
; /* contains 'USBC' */
124 u32 Tag
; /* unique per command id */
125 __le32 DataTransferLength
; /* size of data */
126 u8 Flags
; /* direction in bit 0 */
128 u8 Length
; /* of of the CDB */
129 u8 CDB
[UB_MAX_CDB_SIZE
]; /* max command */
132 #define US_BULK_CB_WRAP_LEN 31
133 #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */
134 #define US_BULK_FLAG_IN 1
135 #define US_BULK_FLAG_OUT 0
137 /* command status wrapper */
138 struct bulk_cs_wrap
{
139 __le32 Signature
; /* should = 'USBS' */
140 u32 Tag
; /* same as original command */
141 __le32 Residue
; /* amount not transferred */
142 u8 Status
; /* see below */
145 #define US_BULK_CS_WRAP_LEN 13
146 #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
147 #define US_BULK_STAT_OK 0
148 #define US_BULK_STAT_FAIL 1
149 #define US_BULK_STAT_PHASE 2
151 /* bulk-only class specific requests */
152 #define US_BULK_RESET_REQUEST 0xff
153 #define US_BULK_GET_MAX_LUN 0xfe
159 #define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */
160 #define UB_MAX_SECTORS 64
163 * A second is more than enough for a 32K transfer (UB_MAX_SECTORS)
164 * even if a webcam hogs the bus, but some devices need time to spin up.
166 #define UB_URB_TIMEOUT (HZ*2)
167 #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */
168 #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */
169 #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */
172 * An instance of a SCSI command in transit.
174 #define UB_DIR_NONE 0
175 #define UB_DIR_READ 1
176 #define UB_DIR_ILLEGAL2 2
177 #define UB_DIR_WRITE 3
179 #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \
180 (((c)==UB_DIR_READ)? 'r': 'n'))
182 enum ub_scsi_cmd_state
{
183 UB_CMDST_INIT
, /* Initial state */
184 UB_CMDST_CMD
, /* Command submitted */
185 UB_CMDST_DATA
, /* Data phase */
186 UB_CMDST_CLR2STS
, /* Clearing before requesting status */
187 UB_CMDST_STAT
, /* Status phase */
188 UB_CMDST_CLEAR
, /* Clearing a stall (halt, actually) */
189 UB_CMDST_CLRRS
, /* Clearing before retrying status */
190 UB_CMDST_SENSE
, /* Sending Request Sense */
191 UB_CMDST_DONE
/* Final state */
195 unsigned char cdb
[UB_MAX_CDB_SIZE
];
196 unsigned char cdb_len
;
198 unsigned char dir
; /* 0 - none, 1 - read, 3 - write. */
199 enum ub_scsi_cmd_state state
;
201 struct ub_scsi_cmd
*next
;
203 int error
; /* Return code - valid upon done */
204 unsigned int act_len
; /* Return size */
205 unsigned char key
, asc
, ascq
; /* May be valid if error==-EIO */
207 int stat_count
; /* Retries getting status. */
209 unsigned int len
; /* Requested length */
210 unsigned int current_sg
;
211 unsigned int nsg
; /* sgv[nsg] */
212 struct scatterlist sgv
[UB_MAX_REQ_SG
];
215 void (*done
)(struct ub_dev
*, struct ub_scsi_cmd
*);
221 unsigned int current_try
;
222 unsigned int nsg
; /* sgv[nsg] */
223 struct scatterlist sgv
[UB_MAX_REQ_SG
];
229 unsigned long nsec
; /* Linux size - 512 byte sectors */
230 unsigned int bsize
; /* Linux hardsect_size */
231 unsigned int bshift
; /* Shift between 512 and hard sects */
235 * This is a direct take-off from linux/include/completion.h
236 * The difference is that I do not wait on this thing, just poll.
237 * When I want to wait (ub_probe), I just use the stock completion.
239 * Note that INIT_COMPLETION takes no lock. It is correct. But why
240 * in the bloody hell that thing takes struct instead of pointer to struct
241 * is quite beyond me. I just copied it from the stock completion.
243 struct ub_completion
{
248 static inline void ub_init_completion(struct ub_completion
*x
)
251 spin_lock_init(&x
->lock
);
254 #define UB_INIT_COMPLETION(x) ((x).done = 0)
256 static void ub_complete(struct ub_completion
*x
)
260 spin_lock_irqsave(&x
->lock
, flags
);
262 spin_unlock_irqrestore(&x
->lock
, flags
);
265 static int ub_is_completed(struct ub_completion
*x
)
270 spin_lock_irqsave(&x
->lock
, flags
);
272 spin_unlock_irqrestore(&x
->lock
, flags
);
278 struct ub_scsi_cmd_queue
{
280 struct ub_scsi_cmd
*head
, *tail
;
284 * The block device instance (one per LUN).
288 struct list_head link
;
289 struct gendisk
*disk
;
290 int id
; /* Host index */
291 int num
; /* LUN number */
294 int changed
; /* Media was changed */
298 struct ub_request urq
;
300 /* Use Ingo's mempool if or when we have more than one command. */
302 * Currently we never need more than one command for the whole device.
303 * However, giving every LUN a command is a cheap and automatic way
304 * to enforce fairness between them.
307 struct ub_scsi_cmd cmdv
[1];
309 struct ub_capacity capacity
;
313 * The USB device instance.
317 atomic_t poison
; /* The USB device is disconnected */
318 int openc
; /* protected by ub_lock! */
319 /* kref is too implicit for our taste */
320 int reset
; /* Reset is running */
323 struct usb_device
*dev
;
324 struct usb_interface
*intf
;
326 struct list_head luns
;
328 unsigned int send_bulk_pipe
; /* cached pipe values */
329 unsigned int recv_bulk_pipe
;
330 unsigned int send_ctrl_pipe
;
331 unsigned int recv_ctrl_pipe
;
333 struct tasklet_struct tasklet
;
335 struct ub_scsi_cmd_queue cmd_queue
;
336 struct ub_scsi_cmd top_rqs_cmd
; /* REQUEST SENSE */
337 unsigned char top_sense
[UB_SENSE_SIZE
];
339 struct ub_completion work_done
;
341 struct timer_list work_timer
;
342 int last_pipe
; /* What might need clearing */
343 __le32 signature
; /* Learned signature */
344 struct bulk_cb_wrap work_bcb
;
345 struct bulk_cs_wrap work_bcs
;
346 struct usb_ctrlrequest work_cr
;
348 struct work_struct reset_work
;
349 wait_queue_head_t reset_wait
;
356 static void ub_cleanup(struct ub_dev
*sc
);
357 static int ub_request_fn_1(struct ub_lun
*lun
, struct request
*rq
);
358 static void ub_cmd_build_block(struct ub_dev
*sc
, struct ub_lun
*lun
,
359 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
);
360 static void ub_cmd_build_packet(struct ub_dev
*sc
, struct ub_lun
*lun
,
361 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
);
362 static void ub_rw_cmd_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
363 static void ub_end_rq(struct request
*rq
, unsigned int status
,
364 unsigned int cmd_len
);
365 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
366 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
);
367 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
368 static void ub_urb_complete(struct urb
*urb
);
369 static void ub_scsi_action(unsigned long _dev
);
370 static void ub_scsi_dispatch(struct ub_dev
*sc
);
371 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
372 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
373 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
);
374 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
375 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
376 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
377 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
378 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
380 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
);
381 static void ub_reset_enter(struct ub_dev
*sc
, int try);
382 static void ub_reset_task(struct work_struct
*work
);
383 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
);
384 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
385 struct ub_capacity
*ret
);
386 static int ub_sync_reset(struct ub_dev
*sc
);
387 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
);
388 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
);
392 #ifdef CONFIG_USB_LIBUSUAL
394 #define ub_usb_ids storage_usb_ids
397 static struct usb_device_id ub_usb_ids
[] = {
398 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE
, US_SC_SCSI
, US_PR_BULK
) },
402 MODULE_DEVICE_TABLE(usb
, ub_usb_ids
);
403 #endif /* CONFIG_USB_LIBUSUAL */
406 * Find me a way to identify "next free minor" for add_disk(),
407 * and the array disappears the next day. However, the number of
408 * hosts has something to do with the naming and /proc/partitions.
409 * This has to be thought out in detail before changing.
410 * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure.
412 #define UB_MAX_HOSTS 26
413 static char ub_hostv
[UB_MAX_HOSTS
];
415 #define UB_QLOCK_NUM 5
416 static spinlock_t ub_qlockv
[UB_QLOCK_NUM
];
417 static int ub_qlock_next
= 0;
419 static DEFINE_SPINLOCK(ub_lock
); /* Locks globals and ->openc */
424 * This also stores the host for indexing by minor, which is somewhat dirty.
426 static int ub_id_get(void)
431 spin_lock_irqsave(&ub_lock
, flags
);
432 for (i
= 0; i
< UB_MAX_HOSTS
; i
++) {
433 if (ub_hostv
[i
] == 0) {
435 spin_unlock_irqrestore(&ub_lock
, flags
);
439 spin_unlock_irqrestore(&ub_lock
, flags
);
443 static void ub_id_put(int id
)
447 if (id
< 0 || id
>= UB_MAX_HOSTS
) {
448 printk(KERN_ERR DRV_NAME
": bad host ID %d\n", id
);
452 spin_lock_irqsave(&ub_lock
, flags
);
453 if (ub_hostv
[id
] == 0) {
454 spin_unlock_irqrestore(&ub_lock
, flags
);
455 printk(KERN_ERR DRV_NAME
": freeing free host ID %d\n", id
);
459 spin_unlock_irqrestore(&ub_lock
, flags
);
463 * This is necessitated by the fact that blk_cleanup_queue does not
464 * necesserily destroy the queue. Instead, it may merely decrease q->refcnt.
465 * Since our blk_init_queue() passes a spinlock common with ub_dev,
466 * we have life time issues when ub_cleanup frees ub_dev.
468 static spinlock_t
*ub_next_lock(void)
473 spin_lock_irqsave(&ub_lock
, flags
);
474 ret
= &ub_qlockv
[ub_qlock_next
];
475 ub_qlock_next
= (ub_qlock_next
+ 1) % UB_QLOCK_NUM
;
476 spin_unlock_irqrestore(&ub_lock
, flags
);
481 * Downcount for deallocation. This rides on two assumptions:
482 * - once something is poisoned, its refcount cannot grow
483 * - opens cannot happen at this time (del_gendisk was done)
484 * If the above is true, we can drop the lock, which we need for
485 * blk_cleanup_queue(): the silly thing may attempt to sleep.
486 * [Actually, it never needs to sleep for us, but it calls might_sleep()]
488 static void ub_put(struct ub_dev
*sc
)
492 spin_lock_irqsave(&ub_lock
, flags
);
494 if (sc
->openc
== 0 && atomic_read(&sc
->poison
)) {
495 spin_unlock_irqrestore(&ub_lock
, flags
);
498 spin_unlock_irqrestore(&ub_lock
, flags
);
503 * Final cleanup and deallocation.
505 static void ub_cleanup(struct ub_dev
*sc
)
509 struct request_queue
*q
;
511 while (!list_empty(&sc
->luns
)) {
513 lun
= list_entry(p
, struct ub_lun
, link
);
516 /* I don't think queue can be NULL. But... Stolen from sx8.c */
517 if ((q
= lun
->disk
->queue
) != NULL
)
518 blk_cleanup_queue(q
);
520 * If we zero disk->private_data BEFORE put_disk, we have
521 * to check for NULL all over the place in open, release,
522 * check_media and revalidate, because the block level
523 * semaphore is well inside the put_disk.
524 * But we cannot zero after the call, because *disk is gone.
525 * The sd.c is blatantly racy in this area.
527 /* disk->private_data = NULL; */
535 usb_set_intfdata(sc
->intf
, NULL
);
536 usb_put_intf(sc
->intf
);
537 usb_put_dev(sc
->dev
);
542 * The "command allocator".
544 static struct ub_scsi_cmd
*ub_get_cmd(struct ub_lun
*lun
)
546 struct ub_scsi_cmd
*ret
;
555 static void ub_put_cmd(struct ub_lun
*lun
, struct ub_scsi_cmd
*cmd
)
557 if (cmd
!= &lun
->cmdv
[0]) {
558 printk(KERN_WARNING
"%s: releasing a foreign cmd %p\n",
563 printk(KERN_WARNING
"%s: releasing a free cmd\n", lun
->name
);
572 static void ub_cmdq_add(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
574 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
576 if (t
->qlen
++ == 0) {
584 if (t
->qlen
> t
->qmax
)
588 static void ub_cmdq_insert(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
590 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
592 if (t
->qlen
++ == 0) {
600 if (t
->qlen
> t
->qmax
)
604 static struct ub_scsi_cmd
*ub_cmdq_pop(struct ub_dev
*sc
)
606 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
607 struct ub_scsi_cmd
*cmd
;
619 #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head)
622 * The request function is our main entry point
625 static void ub_request_fn(struct request_queue
*q
)
627 struct ub_lun
*lun
= q
->queuedata
;
630 while ((rq
= elv_next_request(q
)) != NULL
) {
631 if (ub_request_fn_1(lun
, rq
) != 0) {
638 static int ub_request_fn_1(struct ub_lun
*lun
, struct request
*rq
)
640 struct ub_dev
*sc
= lun
->udev
;
641 struct ub_scsi_cmd
*cmd
;
642 struct ub_request
*urq
;
645 if (atomic_read(&sc
->poison
)) {
646 blkdev_dequeue_request(rq
);
647 ub_end_rq(rq
, DID_NO_CONNECT
<< 16, blk_rq_bytes(rq
));
651 if (lun
->changed
&& !blk_pc_request(rq
)) {
652 blkdev_dequeue_request(rq
);
653 ub_end_rq(rq
, SAM_STAT_CHECK_CONDITION
, blk_rq_bytes(rq
));
657 if (lun
->urq
.rq
!= NULL
)
659 if ((cmd
= ub_get_cmd(lun
)) == NULL
)
661 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
663 blkdev_dequeue_request(rq
);
666 memset(urq
, 0, sizeof(struct ub_request
));
670 * get scatterlist from block layer
672 sg_init_table(&urq
->sgv
[0], UB_MAX_REQ_SG
);
673 n_elem
= blk_rq_map_sg(lun
->disk
->queue
, rq
, &urq
->sgv
[0]);
675 /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */
676 printk(KERN_INFO
"%s: failed request map (%d)\n",
680 if (n_elem
> UB_MAX_REQ_SG
) { /* Paranoia */
681 printk(KERN_WARNING
"%s: request with %d segments\n",
686 sc
->sg_stat
[n_elem
< 5 ? n_elem
: 5]++;
688 if (blk_pc_request(rq
)) {
689 ub_cmd_build_packet(sc
, lun
, cmd
, urq
);
691 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
693 cmd
->state
= UB_CMDST_INIT
;
695 cmd
->done
= ub_rw_cmd_done
;
698 cmd
->tag
= sc
->tagcnt
++;
699 if (ub_submit_scsi(sc
, cmd
) != 0)
705 ub_put_cmd(lun
, cmd
);
706 ub_end_rq(rq
, DID_ERROR
<< 16, blk_rq_bytes(rq
));
710 static void ub_cmd_build_block(struct ub_dev
*sc
, struct ub_lun
*lun
,
711 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
713 struct request
*rq
= urq
->rq
;
714 unsigned int block
, nblks
;
716 if (rq_data_dir(rq
) == WRITE
)
717 cmd
->dir
= UB_DIR_WRITE
;
719 cmd
->dir
= UB_DIR_READ
;
722 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
727 * The call to blk_queue_hardsect_size() guarantees that request
728 * is aligned, but it is given in terms of 512 byte units, always.
730 block
= rq
->sector
>> lun
->capacity
.bshift
;
731 nblks
= rq
->nr_sectors
>> lun
->capacity
.bshift
;
733 cmd
->cdb
[0] = (cmd
->dir
== UB_DIR_READ
)? READ_10
: WRITE_10
;
734 /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
735 cmd
->cdb
[2] = block
>> 24;
736 cmd
->cdb
[3] = block
>> 16;
737 cmd
->cdb
[4] = block
>> 8;
739 cmd
->cdb
[7] = nblks
>> 8;
743 cmd
->len
= rq
->nr_sectors
* 512;
746 static void ub_cmd_build_packet(struct ub_dev
*sc
, struct ub_lun
*lun
,
747 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
749 struct request
*rq
= urq
->rq
;
751 if (rq
->data_len
== 0) {
752 cmd
->dir
= UB_DIR_NONE
;
754 if (rq_data_dir(rq
) == WRITE
)
755 cmd
->dir
= UB_DIR_WRITE
;
757 cmd
->dir
= UB_DIR_READ
;
761 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
763 memcpy(&cmd
->cdb
, rq
->cmd
, rq
->cmd_len
);
764 cmd
->cdb_len
= rq
->cmd_len
;
766 cmd
->len
= rq
->data_len
;
769 static void ub_rw_cmd_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
771 struct ub_lun
*lun
= cmd
->lun
;
772 struct ub_request
*urq
= cmd
->back
;
774 unsigned int scsi_status
;
775 unsigned int cmd_len
;
779 if (cmd
->error
== 0) {
780 if (blk_pc_request(rq
)) {
781 if (cmd
->act_len
>= rq
->data_len
)
784 rq
->data_len
-= cmd
->act_len
;
787 if (cmd
->act_len
!= cmd
->len
) {
788 if ((cmd
->key
== MEDIUM_ERROR
||
789 cmd
->key
== UNIT_ATTENTION
) &&
790 ub_rw_cmd_retry(sc
, lun
, urq
, cmd
) == 0)
792 scsi_status
= SAM_STAT_CHECK_CONDITION
;
798 if (blk_pc_request(rq
)) {
799 /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
800 memcpy(rq
->sense
, sc
->top_sense
, UB_SENSE_SIZE
);
801 rq
->sense_len
= UB_SENSE_SIZE
;
802 if (sc
->top_sense
[0] != 0)
803 scsi_status
= SAM_STAT_CHECK_CONDITION
;
805 scsi_status
= DID_ERROR
<< 16;
807 if (cmd
->error
== -EIO
) {
808 if (ub_rw_cmd_retry(sc
, lun
, urq
, cmd
) == 0)
811 scsi_status
= SAM_STAT_CHECK_CONDITION
;
818 ub_put_cmd(lun
, cmd
);
819 ub_end_rq(rq
, scsi_status
, cmd_len
);
820 blk_start_queue(lun
->disk
->queue
);
823 static void ub_end_rq(struct request
*rq
, unsigned int scsi_status
,
824 unsigned int cmd_len
)
829 if (scsi_status
== 0) {
833 rq
->errors
= scsi_status
;
835 rqlen
= blk_rq_bytes(rq
); /* Oddly enough, this is the residue. */
836 if (__blk_end_request(rq
, error
, cmd_len
)) {
837 printk(KERN_WARNING DRV_NAME
838 ": __blk_end_request blew, %s-cmd total %u rqlen %ld\n",
839 blk_pc_request(rq
)? "pc": "fs", cmd_len
, rqlen
);
843 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
844 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
)
847 if (atomic_read(&sc
->poison
))
850 ub_reset_enter(sc
, urq
->current_try
);
852 if (urq
->current_try
>= 3)
856 /* Remove this if anyone complains of flooding. */
857 printk(KERN_DEBUG
"%s: dir %c len/act %d/%d "
858 "[sense %x %02x %02x] retry %d\n",
859 sc
->name
, UB_DIR_CHAR(cmd
->dir
), cmd
->len
, cmd
->act_len
,
860 cmd
->key
, cmd
->asc
, cmd
->ascq
, urq
->current_try
);
862 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
863 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
865 cmd
->state
= UB_CMDST_INIT
;
867 cmd
->done
= ub_rw_cmd_done
;
870 cmd
->tag
= sc
->tagcnt
++;
873 return ub_submit_scsi(sc
, cmd
);
875 ub_cmdq_add(sc
, cmd
);
881 * Submit a regular SCSI operation (not an auto-sense).
883 * The Iron Law of Good Submit Routine is:
884 * Zero return - callback is done, Nonzero return - callback is not done.
887 * Host is assumed locked.
889 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
892 if (cmd
->state
!= UB_CMDST_INIT
||
893 (cmd
->dir
!= UB_DIR_NONE
&& cmd
->len
== 0)) {
897 ub_cmdq_add(sc
, cmd
);
899 * We can call ub_scsi_dispatch(sc) right away here, but it's a little
900 * safer to jump to a tasklet, in case upper layers do something silly.
902 tasklet_schedule(&sc
->tasklet
);
907 * Submit the first URB for the queued command.
908 * This function does not deal with queueing in any way.
910 static int ub_scsi_cmd_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
912 struct bulk_cb_wrap
*bcb
;
918 * ``If the allocation length is eighteen or greater, and a device
919 * server returns less than eithteen bytes of data, the application
920 * client should assume that the bytes not transferred would have been
921 * zeroes had the device server returned those bytes.''
923 * We zero sense for all commands so that when a packet request
924 * fails it does not return a stale sense.
926 memset(&sc
->top_sense
, 0, UB_SENSE_SIZE
);
928 /* set up the command wrapper */
929 bcb
->Signature
= cpu_to_le32(US_BULK_CB_SIGN
);
930 bcb
->Tag
= cmd
->tag
; /* Endianness is not important */
931 bcb
->DataTransferLength
= cpu_to_le32(cmd
->len
);
932 bcb
->Flags
= (cmd
->dir
== UB_DIR_READ
) ? 0x80 : 0;
933 bcb
->Lun
= (cmd
->lun
!= NULL
) ? cmd
->lun
->num
: 0;
934 bcb
->Length
= cmd
->cdb_len
;
936 /* copy the command payload */
937 memcpy(bcb
->CDB
, cmd
->cdb
, UB_MAX_CDB_SIZE
);
939 UB_INIT_COMPLETION(sc
->work_done
);
941 sc
->last_pipe
= sc
->send_bulk_pipe
;
942 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->send_bulk_pipe
,
943 bcb
, US_BULK_CB_WRAP_LEN
, ub_urb_complete
, sc
);
945 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
946 /* XXX Clear stalls */
947 ub_complete(&sc
->work_done
);
951 sc
->work_timer
.expires
= jiffies
+ UB_URB_TIMEOUT
;
952 add_timer(&sc
->work_timer
);
954 cmd
->state
= UB_CMDST_CMD
;
961 static void ub_urb_timeout(unsigned long arg
)
963 struct ub_dev
*sc
= (struct ub_dev
*) arg
;
966 spin_lock_irqsave(sc
->lock
, flags
);
967 if (!ub_is_completed(&sc
->work_done
))
968 usb_unlink_urb(&sc
->work_urb
);
969 spin_unlock_irqrestore(sc
->lock
, flags
);
973 * Completion routine for the work URB.
975 * This can be called directly from usb_submit_urb (while we have
976 * the sc->lock taken) and from an interrupt (while we do NOT have
977 * the sc->lock taken). Therefore, bounce this off to a tasklet.
979 static void ub_urb_complete(struct urb
*urb
)
981 struct ub_dev
*sc
= urb
->context
;
983 ub_complete(&sc
->work_done
);
984 tasklet_schedule(&sc
->tasklet
);
987 static void ub_scsi_action(unsigned long _dev
)
989 struct ub_dev
*sc
= (struct ub_dev
*) _dev
;
992 spin_lock_irqsave(sc
->lock
, flags
);
993 ub_scsi_dispatch(sc
);
994 spin_unlock_irqrestore(sc
->lock
, flags
);
997 static void ub_scsi_dispatch(struct ub_dev
*sc
)
999 struct ub_scsi_cmd
*cmd
;
1002 while (!sc
->reset
&& (cmd
= ub_cmdq_peek(sc
)) != NULL
) {
1003 if (cmd
->state
== UB_CMDST_DONE
) {
1005 (*cmd
->done
)(sc
, cmd
);
1006 } else if (cmd
->state
== UB_CMDST_INIT
) {
1007 if ((rc
= ub_scsi_cmd_start(sc
, cmd
)) == 0)
1010 cmd
->state
= UB_CMDST_DONE
;
1012 if (!ub_is_completed(&sc
->work_done
))
1014 del_timer(&sc
->work_timer
);
1015 ub_scsi_urb_compl(sc
, cmd
);
1020 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1022 struct urb
*urb
= &sc
->work_urb
;
1023 struct bulk_cs_wrap
*bcs
;
1027 if (atomic_read(&sc
->poison
)) {
1028 ub_state_done(sc
, cmd
, -ENODEV
);
1032 if (cmd
->state
== UB_CMDST_CLEAR
) {
1033 if (urb
->status
== -EPIPE
) {
1035 * STALL while clearning STALL.
1036 * The control pipe clears itself - nothing to do.
1038 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1044 * We ignore the result for the halt clear.
1047 /* reset the endpoint toggle */
1048 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1049 usb_pipeout(sc
->last_pipe
), 0);
1051 ub_state_sense(sc
, cmd
);
1053 } else if (cmd
->state
== UB_CMDST_CLR2STS
) {
1054 if (urb
->status
== -EPIPE
) {
1055 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1061 * We ignore the result for the halt clear.
1064 /* reset the endpoint toggle */
1065 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1066 usb_pipeout(sc
->last_pipe
), 0);
1068 ub_state_stat(sc
, cmd
);
1070 } else if (cmd
->state
== UB_CMDST_CLRRS
) {
1071 if (urb
->status
== -EPIPE
) {
1072 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1078 * We ignore the result for the halt clear.
1081 /* reset the endpoint toggle */
1082 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1083 usb_pipeout(sc
->last_pipe
), 0);
1085 ub_state_stat_counted(sc
, cmd
);
1087 } else if (cmd
->state
== UB_CMDST_CMD
) {
1088 switch (urb
->status
) {
1094 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1096 printk(KERN_NOTICE
"%s: "
1097 "unable to submit clear (%d)\n",
1100 * This is typically ENOMEM or some other such shit.
1101 * Retrying is pointless. Just do Bad End on it...
1103 ub_state_done(sc
, cmd
, rc
);
1106 cmd
->state
= UB_CMDST_CLEAR
;
1108 case -ESHUTDOWN
: /* unplug */
1109 case -EILSEQ
: /* unplug timeout on uhci */
1110 ub_state_done(sc
, cmd
, -ENODEV
);
1115 if (urb
->actual_length
!= US_BULK_CB_WRAP_LEN
) {
1119 if (cmd
->dir
== UB_DIR_NONE
|| cmd
->nsg
< 1) {
1120 ub_state_stat(sc
, cmd
);
1124 // udelay(125); // usb-storage has this
1125 ub_data_start(sc
, cmd
);
1127 } else if (cmd
->state
== UB_CMDST_DATA
) {
1128 if (urb
->status
== -EPIPE
) {
1129 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1131 printk(KERN_NOTICE
"%s: "
1132 "unable to submit clear (%d)\n",
1134 ub_state_done(sc
, cmd
, rc
);
1137 cmd
->state
= UB_CMDST_CLR2STS
;
1140 if (urb
->status
== -EOVERFLOW
) {
1142 * A babble? Failure, but we must transfer CSW now.
1144 cmd
->error
= -EOVERFLOW
; /* A cheap trick... */
1145 ub_state_stat(sc
, cmd
);
1149 if (cmd
->dir
== UB_DIR_WRITE
) {
1151 * Do not continue writes in case of a failure.
1152 * Doing so would cause sectors to be mixed up,
1153 * which is worse than sectors lost.
1155 * We must try to read the CSW, or many devices
1158 len
= urb
->actual_length
;
1159 if (urb
->status
!= 0 ||
1160 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1161 cmd
->act_len
+= len
;
1164 ub_state_stat(sc
, cmd
);
1170 * If an error occurs on read, we record it, and
1171 * continue to fetch data in order to avoid bubble.
1173 * As a small shortcut, we stop if we detect that
1174 * a CSW mixed into data.
1176 if (urb
->status
!= 0)
1179 len
= urb
->actual_length
;
1180 if (urb
->status
!= 0 ||
1181 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1182 if ((len
& 0x1FF) == US_BULK_CS_WRAP_LEN
)
1187 cmd
->act_len
+= urb
->actual_length
;
1189 if (++cmd
->current_sg
< cmd
->nsg
) {
1190 ub_data_start(sc
, cmd
);
1193 ub_state_stat(sc
, cmd
);
1195 } else if (cmd
->state
== UB_CMDST_STAT
) {
1196 if (urb
->status
== -EPIPE
) {
1197 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1199 printk(KERN_NOTICE
"%s: "
1200 "unable to submit clear (%d)\n",
1202 ub_state_done(sc
, cmd
, rc
);
1207 * Having a stall when getting CSW is an error, so
1208 * make sure uppper levels are not oblivious to it.
1210 cmd
->error
= -EIO
; /* A cheap trick... */
1212 cmd
->state
= UB_CMDST_CLRRS
;
1216 /* Catch everything, including -EOVERFLOW and other nasties. */
1217 if (urb
->status
!= 0)
1220 if (urb
->actual_length
== 0) {
1221 ub_state_stat_counted(sc
, cmd
);
1226 * Check the returned Bulk protocol status.
1227 * The status block has to be validated first.
1230 bcs
= &sc
->work_bcs
;
1232 if (sc
->signature
== cpu_to_le32(0)) {
1234 * This is the first reply, so do not perform the check.
1235 * Instead, remember the signature the device uses
1236 * for future checks. But do not allow a nul.
1238 sc
->signature
= bcs
->Signature
;
1239 if (sc
->signature
== cpu_to_le32(0)) {
1240 ub_state_stat_counted(sc
, cmd
);
1244 if (bcs
->Signature
!= sc
->signature
) {
1245 ub_state_stat_counted(sc
, cmd
);
1250 if (bcs
->Tag
!= cmd
->tag
) {
1252 * This usually happens when we disagree with the
1253 * device's microcode about something. For instance,
1254 * a few of them throw this after timeouts. They buffer
1255 * commands and reply at commands we timed out before.
1256 * Without flushing these replies we loop forever.
1258 ub_state_stat_counted(sc
, cmd
);
1262 len
= le32_to_cpu(bcs
->Residue
);
1263 if (len
!= cmd
->len
- cmd
->act_len
) {
1265 * It is all right to transfer less, the caller has
1266 * to check. But it's not all right if the device
1267 * counts disagree with our counts.
1272 switch (bcs
->Status
) {
1273 case US_BULK_STAT_OK
:
1275 case US_BULK_STAT_FAIL
:
1276 ub_state_sense(sc
, cmd
);
1278 case US_BULK_STAT_PHASE
:
1281 printk(KERN_INFO
"%s: unknown CSW status 0x%x\n",
1282 sc
->name
, bcs
->Status
);
1283 ub_state_done(sc
, cmd
, -EINVAL
);
1287 /* Not zeroing error to preserve a babble indicator */
1288 if (cmd
->error
!= 0) {
1289 ub_state_sense(sc
, cmd
);
1292 cmd
->state
= UB_CMDST_DONE
;
1294 (*cmd
->done
)(sc
, cmd
);
1296 } else if (cmd
->state
== UB_CMDST_SENSE
) {
1297 ub_state_done(sc
, cmd
, -EIO
);
1300 printk(KERN_WARNING
"%s: "
1301 "wrong command state %d\n",
1302 sc
->name
, cmd
->state
);
1303 ub_state_done(sc
, cmd
, -EINVAL
);
1308 Bad_End
: /* Little Excel is dead */
1309 ub_state_done(sc
, cmd
, -EIO
);
1313 * Factorization helper for the command state machine:
1314 * Initiate a data segment transfer.
1316 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1318 struct scatterlist
*sg
= &cmd
->sgv
[cmd
->current_sg
];
1322 UB_INIT_COMPLETION(sc
->work_done
);
1324 if (cmd
->dir
== UB_DIR_READ
)
1325 pipe
= sc
->recv_bulk_pipe
;
1327 pipe
= sc
->send_bulk_pipe
;
1328 sc
->last_pipe
= pipe
;
1329 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, pipe
, sg_virt(sg
),
1330 sg
->length
, ub_urb_complete
, sc
);
1332 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1333 /* XXX Clear stalls */
1334 ub_complete(&sc
->work_done
);
1335 ub_state_done(sc
, cmd
, rc
);
1339 sc
->work_timer
.expires
= jiffies
+ UB_DATA_TIMEOUT
;
1340 add_timer(&sc
->work_timer
);
1342 cmd
->state
= UB_CMDST_DATA
;
1346 * Factorization helper for the command state machine:
1347 * Finish the command.
1349 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
)
1353 cmd
->state
= UB_CMDST_DONE
;
1355 (*cmd
->done
)(sc
, cmd
);
1359 * Factorization helper for the command state machine:
1360 * Submit a CSW read.
1362 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1366 UB_INIT_COMPLETION(sc
->work_done
);
1368 sc
->last_pipe
= sc
->recv_bulk_pipe
;
1369 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_bulk_pipe
,
1370 &sc
->work_bcs
, US_BULK_CS_WRAP_LEN
, ub_urb_complete
, sc
);
1372 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1373 /* XXX Clear stalls */
1374 ub_complete(&sc
->work_done
);
1375 ub_state_done(sc
, cmd
, rc
);
1379 sc
->work_timer
.expires
= jiffies
+ UB_STAT_TIMEOUT
;
1380 add_timer(&sc
->work_timer
);
1385 * Factorization helper for the command state machine:
1386 * Submit a CSW read and go to STAT state.
1388 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1391 if (__ub_state_stat(sc
, cmd
) != 0)
1394 cmd
->stat_count
= 0;
1395 cmd
->state
= UB_CMDST_STAT
;
1399 * Factorization helper for the command state machine:
1400 * Submit a CSW read and go to STAT state with counter (along [C] path).
1402 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1405 if (++cmd
->stat_count
>= 4) {
1406 ub_state_sense(sc
, cmd
);
1410 if (__ub_state_stat(sc
, cmd
) != 0)
1413 cmd
->state
= UB_CMDST_STAT
;
1417 * Factorization helper for the command state machine:
1418 * Submit a REQUEST SENSE and go to SENSE state.
1420 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1422 struct ub_scsi_cmd
*scmd
;
1423 struct scatterlist
*sg
;
1426 if (cmd
->cdb
[0] == REQUEST_SENSE
) {
1431 scmd
= &sc
->top_rqs_cmd
;
1432 memset(scmd
, 0, sizeof(struct ub_scsi_cmd
));
1433 scmd
->cdb
[0] = REQUEST_SENSE
;
1434 scmd
->cdb
[4] = UB_SENSE_SIZE
;
1436 scmd
->dir
= UB_DIR_READ
;
1437 scmd
->state
= UB_CMDST_INIT
;
1440 sg_init_table(sg
, UB_MAX_REQ_SG
);
1441 sg_set_page(sg
, virt_to_page(sc
->top_sense
), UB_SENSE_SIZE
,
1442 (unsigned long)sc
->top_sense
& (PAGE_SIZE
-1));
1443 scmd
->len
= UB_SENSE_SIZE
;
1444 scmd
->lun
= cmd
->lun
;
1445 scmd
->done
= ub_top_sense_done
;
1448 scmd
->tag
= sc
->tagcnt
++;
1450 cmd
->state
= UB_CMDST_SENSE
;
1452 ub_cmdq_insert(sc
, scmd
);
1456 ub_state_done(sc
, cmd
, rc
);
1460 * A helper for the command's state machine:
1461 * Submit a stall clear.
1463 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
1467 struct usb_ctrlrequest
*cr
;
1470 endp
= usb_pipeendpoint(stalled_pipe
);
1471 if (usb_pipein (stalled_pipe
))
1475 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
1476 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
1477 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
1478 cr
->wIndex
= cpu_to_le16(endp
);
1479 cr
->wLength
= cpu_to_le16(0);
1481 UB_INIT_COMPLETION(sc
->work_done
);
1483 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1484 (unsigned char*) cr
, NULL
, 0, ub_urb_complete
, sc
);
1486 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1487 ub_complete(&sc
->work_done
);
1491 sc
->work_timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1492 add_timer(&sc
->work_timer
);
1498 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
)
1500 unsigned char *sense
= sc
->top_sense
;
1501 struct ub_scsi_cmd
*cmd
;
1504 * Find the command which triggered the unit attention or a check,
1505 * save the sense into it, and advance its state machine.
1507 if ((cmd
= ub_cmdq_peek(sc
)) == NULL
) {
1508 printk(KERN_WARNING
"%s: sense done while idle\n", sc
->name
);
1511 if (cmd
!= scmd
->back
) {
1512 printk(KERN_WARNING
"%s: "
1513 "sense done for wrong command 0x%x\n",
1514 sc
->name
, cmd
->tag
);
1517 if (cmd
->state
!= UB_CMDST_SENSE
) {
1518 printk(KERN_WARNING
"%s: "
1519 "sense done with bad cmd state %d\n",
1520 sc
->name
, cmd
->state
);
1525 * Ignoring scmd->act_len, because the buffer was pre-zeroed.
1527 cmd
->key
= sense
[2] & 0x0F;
1528 cmd
->asc
= sense
[12];
1529 cmd
->ascq
= sense
[13];
1531 ub_scsi_urb_compl(sc
, cmd
);
1536 * XXX Move usb_reset_device to khubd. Hogging kevent is not a good thing.
1537 * XXX Make usb_sync_reset asynchronous.
1540 static void ub_reset_enter(struct ub_dev
*sc
, int try)
1544 /* This happens often on multi-LUN devices. */
1547 sc
->reset
= try + 1;
1549 #if 0 /* Not needed because the disconnect waits for us. */
1550 unsigned long flags
;
1551 spin_lock_irqsave(&ub_lock
, flags
);
1553 spin_unlock_irqrestore(&ub_lock
, flags
);
1556 #if 0 /* We let them stop themselves. */
1558 list_for_each_entry(lun
, &sc
->luns
, link
) {
1559 blk_stop_queue(lun
->disk
->queue
);
1563 schedule_work(&sc
->reset_work
);
1566 static void ub_reset_task(struct work_struct
*work
)
1568 struct ub_dev
*sc
= container_of(work
, struct ub_dev
, reset_work
);
1569 unsigned long flags
;
1574 printk(KERN_WARNING
"%s: Running reset unrequested\n",
1579 if (atomic_read(&sc
->poison
)) {
1581 } else if ((sc
->reset
& 1) == 0) {
1583 msleep(700); /* usb-storage sleeps 6s (!) */
1584 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
1585 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
1586 } else if (sc
->dev
->actconfig
->desc
.bNumInterfaces
!= 1) {
1589 if ((lkr
= usb_lock_device_for_reset(sc
->dev
, sc
->intf
)) < 0) {
1591 "%s: usb_lock_device_for_reset failed (%d)\n",
1594 rc
= usb_reset_device(sc
->dev
);
1596 printk(KERN_NOTICE
"%s: "
1597 "usb_lock_device_for_reset failed (%d)\n",
1602 usb_unlock_device(sc
->dev
);
1607 * In theory, no commands can be running while reset is active,
1608 * so nobody can ask for another reset, and so we do not need any
1609 * queues of resets or anything. We do need a spinlock though,
1610 * to interact with block layer.
1612 spin_lock_irqsave(sc
->lock
, flags
);
1614 tasklet_schedule(&sc
->tasklet
);
1615 list_for_each_entry(lun
, &sc
->luns
, link
) {
1616 blk_start_queue(lun
->disk
->queue
);
1618 wake_up(&sc
->reset_wait
);
1619 spin_unlock_irqrestore(sc
->lock
, flags
);
1623 * This is called from a process context.
1625 static void ub_revalidate(struct ub_dev
*sc
, struct ub_lun
*lun
)
1628 lun
->readonly
= 0; /* XXX Query this from the device */
1630 lun
->capacity
.nsec
= 0;
1631 lun
->capacity
.bsize
= 512;
1632 lun
->capacity
.bshift
= 0;
1634 if (ub_sync_tur(sc
, lun
) != 0)
1635 return; /* Not ready */
1638 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1640 * The retry here means something is wrong, either with the
1641 * device, with the transport, or with our code.
1642 * We keep this because sd.c has retries for capacity.
1644 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1645 lun
->capacity
.nsec
= 0;
1646 lun
->capacity
.bsize
= 512;
1647 lun
->capacity
.bshift
= 0;
1654 * This is mostly needed to keep refcounting, but also to support
1655 * media checks on removable media drives.
1657 static int ub_bd_open(struct inode
*inode
, struct file
*filp
)
1659 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1660 struct ub_lun
*lun
= disk
->private_data
;
1661 struct ub_dev
*sc
= lun
->udev
;
1662 unsigned long flags
;
1665 spin_lock_irqsave(&ub_lock
, flags
);
1666 if (atomic_read(&sc
->poison
)) {
1667 spin_unlock_irqrestore(&ub_lock
, flags
);
1671 spin_unlock_irqrestore(&ub_lock
, flags
);
1673 if (lun
->removable
|| lun
->readonly
)
1674 check_disk_change(inode
->i_bdev
);
1677 * The sd.c considers ->media_present and ->changed not equivalent,
1678 * under some pretty murky conditions (a failure of READ CAPACITY).
1679 * We may need it one day.
1681 if (lun
->removable
&& lun
->changed
&& !(filp
->f_flags
& O_NDELAY
)) {
1686 if (lun
->readonly
&& (filp
->f_mode
& FMODE_WRITE
)) {
1700 static int ub_bd_release(struct inode
*inode
, struct file
*filp
)
1702 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1703 struct ub_lun
*lun
= disk
->private_data
;
1704 struct ub_dev
*sc
= lun
->udev
;
1711 * The ioctl interface.
1713 static int ub_bd_ioctl(struct inode
*inode
, struct file
*filp
,
1714 unsigned int cmd
, unsigned long arg
)
1716 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1717 void __user
*usermem
= (void __user
*) arg
;
1719 return scsi_cmd_ioctl(filp
, disk
->queue
, disk
, cmd
, usermem
);
1723 * This is called once a new disk was seen by the block layer or by ub_probe().
1724 * The main onjective here is to discover the features of the media such as
1725 * the capacity, read-only status, etc. USB storage generally does not
1726 * need to be spun up, but if we needed it, this would be the place.
1728 * This call can sleep.
1730 * The return code is not used.
1732 static int ub_bd_revalidate(struct gendisk
*disk
)
1734 struct ub_lun
*lun
= disk
->private_data
;
1736 ub_revalidate(lun
->udev
, lun
);
1738 /* XXX Support sector size switching like in sr.c */
1739 blk_queue_hardsect_size(disk
->queue
, lun
->capacity
.bsize
);
1740 set_capacity(disk
, lun
->capacity
.nsec
);
1741 // set_disk_ro(sdkp->disk, lun->readonly);
1747 * The check is called by the block layer to verify if the media
1748 * is still available. It is supposed to be harmless, lightweight and
1749 * non-intrusive in case the media was not changed.
1751 * This call can sleep.
1753 * The return code is bool!
1755 static int ub_bd_media_changed(struct gendisk
*disk
)
1757 struct ub_lun
*lun
= disk
->private_data
;
1759 if (!lun
->removable
)
1763 * We clean checks always after every command, so this is not
1764 * as dangerous as it looks. If the TEST_UNIT_READY fails here,
1765 * the device is actually not ready with operator or software
1766 * intervention required. One dangerous item might be a drive which
1767 * spins itself down, and come the time to write dirty pages, this
1768 * will fail, then block layer discards the data. Since we never
1769 * spin drives up, such devices simply cannot be used with ub anyway.
1771 if (ub_sync_tur(lun
->udev
, lun
) != 0) {
1776 return lun
->changed
;
1779 static struct block_device_operations ub_bd_fops
= {
1780 .owner
= THIS_MODULE
,
1782 .release
= ub_bd_release
,
1783 .ioctl
= ub_bd_ioctl
,
1784 .media_changed
= ub_bd_media_changed
,
1785 .revalidate_disk
= ub_bd_revalidate
,
1789 * Common ->done routine for commands executed synchronously.
1791 static void ub_probe_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1793 struct completion
*cop
= cmd
->back
;
1798 * Test if the device has a check condition on it, synchronously.
1800 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
)
1802 struct ub_scsi_cmd
*cmd
;
1803 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) };
1804 unsigned long flags
;
1805 struct completion
compl;
1808 init_completion(&compl);
1811 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1814 cmd
->cdb
[0] = TEST_UNIT_READY
;
1816 cmd
->dir
= UB_DIR_NONE
;
1817 cmd
->state
= UB_CMDST_INIT
;
1818 cmd
->lun
= lun
; /* This may be NULL, but that's ok */
1819 cmd
->done
= ub_probe_done
;
1822 spin_lock_irqsave(sc
->lock
, flags
);
1823 cmd
->tag
= sc
->tagcnt
++;
1825 rc
= ub_submit_scsi(sc
, cmd
);
1826 spin_unlock_irqrestore(sc
->lock
, flags
);
1831 wait_for_completion(&compl);
1835 if (rc
== -EIO
&& cmd
->key
!= 0) /* Retries for benh's key */
1845 * Read the SCSI capacity synchronously (for probing).
1847 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
1848 struct ub_capacity
*ret
)
1850 struct ub_scsi_cmd
*cmd
;
1851 struct scatterlist
*sg
;
1853 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) + 8 };
1854 unsigned long flags
;
1855 unsigned int bsize
, shift
;
1857 struct completion
compl;
1860 init_completion(&compl);
1863 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1865 p
= (char *)cmd
+ sizeof(struct ub_scsi_cmd
);
1869 cmd
->dir
= UB_DIR_READ
;
1870 cmd
->state
= UB_CMDST_INIT
;
1873 sg_init_table(sg
, UB_MAX_REQ_SG
);
1874 sg_set_page(sg
, virt_to_page(p
), 8, (unsigned long)p
& (PAGE_SIZE
-1));
1877 cmd
->done
= ub_probe_done
;
1880 spin_lock_irqsave(sc
->lock
, flags
);
1881 cmd
->tag
= sc
->tagcnt
++;
1883 rc
= ub_submit_scsi(sc
, cmd
);
1884 spin_unlock_irqrestore(sc
->lock
, flags
);
1889 wait_for_completion(&compl);
1891 if (cmd
->error
!= 0) {
1895 if (cmd
->act_len
!= 8) {
1900 /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */
1901 nsec
= be32_to_cpu(*(__be32
*)p
) + 1;
1902 bsize
= be32_to_cpu(*(__be32
*)(p
+ 4));
1904 case 512: shift
= 0; break;
1905 case 1024: shift
= 1; break;
1906 case 2048: shift
= 2; break;
1907 case 4096: shift
= 3; break;
1914 ret
->bshift
= shift
;
1915 ret
->nsec
= nsec
<< shift
;
1928 static void ub_probe_urb_complete(struct urb
*urb
)
1930 struct completion
*cop
= urb
->context
;
1934 static void ub_probe_timeout(unsigned long arg
)
1936 struct completion
*cop
= (struct completion
*) arg
;
1941 * Reset with a Bulk reset.
1943 static int ub_sync_reset(struct ub_dev
*sc
)
1945 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
1946 struct usb_ctrlrequest
*cr
;
1947 struct completion
compl;
1948 struct timer_list timer
;
1951 init_completion(&compl);
1954 cr
->bRequestType
= USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
1955 cr
->bRequest
= US_BULK_RESET_REQUEST
;
1956 cr
->wValue
= cpu_to_le16(0);
1957 cr
->wIndex
= cpu_to_le16(ifnum
);
1958 cr
->wLength
= cpu_to_le16(0);
1960 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1961 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
1963 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
1965 "%s: Unable to submit a bulk reset (%d)\n", sc
->name
, rc
);
1970 timer
.function
= ub_probe_timeout
;
1971 timer
.data
= (unsigned long) &compl;
1972 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1975 wait_for_completion(&compl);
1977 del_timer_sync(&timer
);
1978 usb_kill_urb(&sc
->work_urb
);
1980 return sc
->work_urb
.status
;
1984 * Get number of LUNs by the way of Bulk GetMaxLUN command.
1986 static int ub_sync_getmaxlun(struct ub_dev
*sc
)
1988 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
1990 enum { ALLOC_SIZE
= 1 };
1991 struct usb_ctrlrequest
*cr
;
1992 struct completion
compl;
1993 struct timer_list timer
;
1997 init_completion(&compl);
2000 if ((p
= kmalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
2005 cr
->bRequestType
= USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
2006 cr
->bRequest
= US_BULK_GET_MAX_LUN
;
2007 cr
->wValue
= cpu_to_le16(0);
2008 cr
->wIndex
= cpu_to_le16(ifnum
);
2009 cr
->wLength
= cpu_to_le16(1);
2011 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_ctrl_pipe
,
2012 (unsigned char*) cr
, p
, 1, ub_probe_urb_complete
, &compl);
2014 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0)
2018 timer
.function
= ub_probe_timeout
;
2019 timer
.data
= (unsigned long) &compl;
2020 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2023 wait_for_completion(&compl);
2025 del_timer_sync(&timer
);
2026 usb_kill_urb(&sc
->work_urb
);
2028 if ((rc
= sc
->work_urb
.status
) < 0)
2031 if (sc
->work_urb
.actual_length
!= 1) {
2034 if ((nluns
= *p
) == 55) {
2037 /* GetMaxLUN returns the maximum LUN number */
2039 if (nluns
> UB_MAX_LUNS
)
2040 nluns
= UB_MAX_LUNS
;
2055 * Clear initial stalls.
2057 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
)
2060 struct usb_ctrlrequest
*cr
;
2061 struct completion
compl;
2062 struct timer_list timer
;
2065 init_completion(&compl);
2067 endp
= usb_pipeendpoint(stalled_pipe
);
2068 if (usb_pipein (stalled_pipe
))
2072 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
2073 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
2074 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
2075 cr
->wIndex
= cpu_to_le16(endp
);
2076 cr
->wLength
= cpu_to_le16(0);
2078 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
2079 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
2081 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
2083 "%s: Unable to submit a probe clear (%d)\n", sc
->name
, rc
);
2088 timer
.function
= ub_probe_timeout
;
2089 timer
.data
= (unsigned long) &compl;
2090 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2093 wait_for_completion(&compl);
2095 del_timer_sync(&timer
);
2096 usb_kill_urb(&sc
->work_urb
);
2098 /* reset the endpoint toggle */
2099 usb_settoggle(sc
->dev
, endp
, usb_pipeout(sc
->last_pipe
), 0);
2105 * Get the pipe settings.
2107 static int ub_get_pipes(struct ub_dev
*sc
, struct usb_device
*dev
,
2108 struct usb_interface
*intf
)
2110 struct usb_host_interface
*altsetting
= intf
->cur_altsetting
;
2111 struct usb_endpoint_descriptor
*ep_in
= NULL
;
2112 struct usb_endpoint_descriptor
*ep_out
= NULL
;
2113 struct usb_endpoint_descriptor
*ep
;
2117 * Find the endpoints we need.
2118 * We are expecting a minimum of 2 endpoints - in and out (bulk).
2119 * We will ignore any others.
2121 for (i
= 0; i
< altsetting
->desc
.bNumEndpoints
; i
++) {
2122 ep
= &altsetting
->endpoint
[i
].desc
;
2124 /* Is it a BULK endpoint? */
2125 if ((ep
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
2126 == USB_ENDPOINT_XFER_BULK
) {
2127 /* BULK in or out? */
2128 if (ep
->bEndpointAddress
& USB_DIR_IN
) {
2138 if (ep_in
== NULL
|| ep_out
== NULL
) {
2139 printk(KERN_NOTICE
"%s: failed endpoint check\n",
2144 /* Calculate and store the pipe values */
2145 sc
->send_ctrl_pipe
= usb_sndctrlpipe(dev
, 0);
2146 sc
->recv_ctrl_pipe
= usb_rcvctrlpipe(dev
, 0);
2147 sc
->send_bulk_pipe
= usb_sndbulkpipe(dev
,
2148 ep_out
->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
2149 sc
->recv_bulk_pipe
= usb_rcvbulkpipe(dev
,
2150 ep_in
->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
2156 * Probing is done in the process context, which allows us to cheat
2157 * and not to build a state machine for the discovery.
2159 static int ub_probe(struct usb_interface
*intf
,
2160 const struct usb_device_id
*dev_id
)
2167 if (usb_usual_check_type(dev_id
, USB_US_TYPE_UB
))
2171 if ((sc
= kzalloc(sizeof(struct ub_dev
), GFP_KERNEL
)) == NULL
)
2173 sc
->lock
= ub_next_lock();
2174 INIT_LIST_HEAD(&sc
->luns
);
2175 usb_init_urb(&sc
->work_urb
);
2176 tasklet_init(&sc
->tasklet
, ub_scsi_action
, (unsigned long)sc
);
2177 atomic_set(&sc
->poison
, 0);
2178 INIT_WORK(&sc
->reset_work
, ub_reset_task
);
2179 init_waitqueue_head(&sc
->reset_wait
);
2181 init_timer(&sc
->work_timer
);
2182 sc
->work_timer
.data
= (unsigned long) sc
;
2183 sc
->work_timer
.function
= ub_urb_timeout
;
2185 ub_init_completion(&sc
->work_done
);
2186 sc
->work_done
.done
= 1; /* A little yuk, but oh well... */
2188 sc
->dev
= interface_to_usbdev(intf
);
2190 // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2191 usb_set_intfdata(intf
, sc
);
2192 usb_get_dev(sc
->dev
);
2194 * Since we give the interface struct to the block level through
2195 * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent
2196 * oopses on close after a disconnect (kernels 2.6.16 and up).
2198 usb_get_intf(sc
->intf
);
2200 snprintf(sc
->name
, 12, DRV_NAME
"(%d.%d)",
2201 sc
->dev
->bus
->busnum
, sc
->dev
->devnum
);
2203 /* XXX Verify that we can handle the device (from descriptors) */
2205 if (ub_get_pipes(sc
, sc
->dev
, intf
) != 0)
2209 * At this point, all USB initialization is done, do upper layer.
2210 * We really hate halfway initialized structures, so from the
2211 * invariants perspective, this ub_dev is fully constructed at
2216 * This is needed to clear toggles. It is a problem only if we do
2217 * `rmmod ub && modprobe ub` without disconnects, but we like that.
2219 #if 0 /* iPod Mini fails if we do this (big white iPod works) */
2220 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
2221 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
2225 * The way this is used by the startup code is a little specific.
2226 * A SCSI check causes a USB stall. Our common case code sees it
2227 * and clears the check, after which the device is ready for use.
2228 * But if a check was not present, any command other than
2229 * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE).
2231 * If we neglect to clear the SCSI check, the first real command fails
2232 * (which is the capacity readout). We clear that and retry, but why
2233 * causing spurious retries for no reason.
2235 * Revalidation may start with its own TEST_UNIT_READY, but that one
2236 * has to succeed, so we clear checks with an additional one here.
2237 * In any case it's not our business how revaliadation is implemented.
2239 for (i
= 0; i
< 3; i
++) { /* Retries for the schwag key from KS'04 */
2240 if ((rc
= ub_sync_tur(sc
, NULL
)) <= 0) break;
2241 if (rc
!= 0x6) break;
2246 for (i
= 0; i
< 3; i
++) {
2247 if ((rc
= ub_sync_getmaxlun(sc
)) < 0)
2256 for (i
= 0; i
< nluns
; i
++) {
2257 ub_probe_lun(sc
, i
);
2262 usb_set_intfdata(intf
, NULL
);
2263 usb_put_intf(sc
->intf
);
2264 usb_put_dev(sc
->dev
);
2270 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
)
2273 struct request_queue
*q
;
2274 struct gendisk
*disk
;
2278 if ((lun
= kzalloc(sizeof(struct ub_lun
), GFP_KERNEL
)) == NULL
)
2283 if ((lun
->id
= ub_id_get()) == -1)
2288 snprintf(lun
->name
, 16, DRV_NAME
"%c(%d.%d.%d)",
2289 lun
->id
+ 'a', sc
->dev
->bus
->busnum
, sc
->dev
->devnum
, lun
->num
);
2291 lun
->removable
= 1; /* XXX Query this from the device */
2292 lun
->changed
= 1; /* ub_revalidate clears only */
2293 ub_revalidate(sc
, lun
);
2296 if ((disk
= alloc_disk(UB_PARTS_PER_LUN
)) == NULL
)
2299 sprintf(disk
->disk_name
, DRV_NAME
"%c", lun
->id
+ 'a');
2300 disk
->major
= UB_MAJOR
;
2301 disk
->first_minor
= lun
->id
* UB_PARTS_PER_LUN
;
2302 disk
->fops
= &ub_bd_fops
;
2303 disk
->private_data
= lun
;
2304 disk
->driverfs_dev
= &sc
->intf
->dev
;
2307 if ((q
= blk_init_queue(ub_request_fn
, sc
->lock
)) == NULL
)
2312 blk_queue_bounce_limit(q
, BLK_BOUNCE_HIGH
);
2313 blk_queue_max_hw_segments(q
, UB_MAX_REQ_SG
);
2314 blk_queue_max_phys_segments(q
, UB_MAX_REQ_SG
);
2315 blk_queue_segment_boundary(q
, 0xffffffff); /* Dubious. */
2316 blk_queue_max_sectors(q
, UB_MAX_SECTORS
);
2317 blk_queue_hardsect_size(q
, lun
->capacity
.bsize
);
2321 list_add(&lun
->link
, &sc
->luns
);
2323 set_capacity(disk
, lun
->capacity
.nsec
);
2325 disk
->flags
|= GENHD_FL_REMOVABLE
;
2341 static void ub_disconnect(struct usb_interface
*intf
)
2343 struct ub_dev
*sc
= usb_get_intfdata(intf
);
2345 unsigned long flags
;
2348 * Prevent ub_bd_release from pulling the rug from under us.
2349 * XXX This is starting to look like a kref.
2350 * XXX Why not to take this ref at probe time?
2352 spin_lock_irqsave(&ub_lock
, flags
);
2354 spin_unlock_irqrestore(&ub_lock
, flags
);
2357 * Fence stall clearnings, operations triggered by unlinkings and so on.
2358 * We do not attempt to unlink any URBs, because we do not trust the
2359 * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway.
2361 atomic_set(&sc
->poison
, 1);
2364 * Wait for reset to end, if any.
2366 wait_event(sc
->reset_wait
, !sc
->reset
);
2369 * Blow away queued commands.
2371 * Actually, this never works, because before we get here
2372 * the HCD terminates outstanding URB(s). It causes our
2373 * SCSI command queue to advance, commands fail to submit,
2374 * and the whole queue drains. So, we just use this code to
2377 spin_lock_irqsave(sc
->lock
, flags
);
2379 struct ub_scsi_cmd
*cmd
;
2381 while ((cmd
= ub_cmdq_peek(sc
)) != NULL
) {
2382 cmd
->error
= -ENOTCONN
;
2383 cmd
->state
= UB_CMDST_DONE
;
2385 (*cmd
->done
)(sc
, cmd
);
2389 printk(KERN_WARNING
"%s: "
2390 "%d was queued after shutdown\n", sc
->name
, cnt
);
2393 spin_unlock_irqrestore(sc
->lock
, flags
);
2396 * Unregister the upper layer.
2398 list_for_each_entry(lun
, &sc
->luns
, link
) {
2399 del_gendisk(lun
->disk
);
2401 * I wish I could do:
2402 * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags);
2403 * As it is, we rely on our internal poisoning and let
2404 * the upper levels to spin furiously failing all the I/O.
2409 * Testing for -EINPROGRESS is always a bug, so we are bending
2410 * the rules a little.
2412 spin_lock_irqsave(sc
->lock
, flags
);
2413 if (sc
->work_urb
.status
== -EINPROGRESS
) { /* janitors: ignore */
2414 printk(KERN_WARNING
"%s: "
2415 "URB is active after disconnect\n", sc
->name
);
2417 spin_unlock_irqrestore(sc
->lock
, flags
);
2420 * There is virtually no chance that other CPU runs times so long
2421 * after ub_urb_complete should have called del_timer, but only if HCD
2422 * didn't forget to deliver a callback on unlink.
2424 del_timer_sync(&sc
->work_timer
);
2427 * At this point there must be no commands coming from anyone
2428 * and no URBs left in transit.
2434 static struct usb_driver ub_driver
= {
2437 .disconnect
= ub_disconnect
,
2438 .id_table
= ub_usb_ids
,
2441 static int __init
ub_init(void)
2446 for (i
= 0; i
< UB_QLOCK_NUM
; i
++)
2447 spin_lock_init(&ub_qlockv
[i
]);
2449 if ((rc
= register_blkdev(UB_MAJOR
, DRV_NAME
)) != 0)
2452 if ((rc
= usb_register(&ub_driver
)) != 0)
2455 usb_usual_set_present(USB_US_TYPE_UB
);
2459 unregister_blkdev(UB_MAJOR
, DRV_NAME
);
2464 static void __exit
ub_exit(void)
2466 usb_deregister(&ub_driver
);
2468 unregister_blkdev(UB_MAJOR
, DRV_NAME
);
2469 usb_usual_clear_present(USB_US_TYPE_UB
);
2472 module_init(ub_init
);
2473 module_exit(ub_exit
);
2475 MODULE_LICENSE("GPL");