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/devfs_fs_kernel.h>
28 #include <linux/timer.h>
29 #include <scsi/scsi.h>
32 #define DEVFS_NAME DRV_NAME
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
, int uptodate
);
364 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
365 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
);
366 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
367 static void ub_urb_complete(struct urb
*urb
, struct pt_regs
*pt
);
368 static void ub_scsi_action(unsigned long _dev
);
369 static void ub_scsi_dispatch(struct ub_dev
*sc
);
370 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
371 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
372 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
);
373 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
374 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
375 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
376 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
377 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
379 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
);
380 static void ub_reset_enter(struct ub_dev
*sc
, int try);
381 static void ub_reset_task(void *arg
);
382 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
);
383 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
384 struct ub_capacity
*ret
);
385 static int ub_sync_reset(struct ub_dev
*sc
);
386 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
);
387 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
);
391 #ifdef CONFIG_USB_LIBUSUAL
393 #define ub_usb_ids storage_usb_ids
396 static struct usb_device_id ub_usb_ids
[] = {
397 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE
, US_SC_SCSI
, US_PR_BULK
) },
401 MODULE_DEVICE_TABLE(usb
, ub_usb_ids
);
402 #endif /* CONFIG_USB_LIBUSUAL */
405 * Find me a way to identify "next free minor" for add_disk(),
406 * and the array disappears the next day. However, the number of
407 * hosts has something to do with the naming and /proc/partitions.
408 * This has to be thought out in detail before changing.
409 * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure.
411 #define UB_MAX_HOSTS 26
412 static char ub_hostv
[UB_MAX_HOSTS
];
414 #define UB_QLOCK_NUM 5
415 static spinlock_t ub_qlockv
[UB_QLOCK_NUM
];
416 static int ub_qlock_next
= 0;
418 static DEFINE_SPINLOCK(ub_lock
); /* Locks globals and ->openc */
423 * This also stores the host for indexing by minor, which is somewhat dirty.
425 static int ub_id_get(void)
430 spin_lock_irqsave(&ub_lock
, flags
);
431 for (i
= 0; i
< UB_MAX_HOSTS
; i
++) {
432 if (ub_hostv
[i
] == 0) {
434 spin_unlock_irqrestore(&ub_lock
, flags
);
438 spin_unlock_irqrestore(&ub_lock
, flags
);
442 static void ub_id_put(int id
)
446 if (id
< 0 || id
>= UB_MAX_HOSTS
) {
447 printk(KERN_ERR DRV_NAME
": bad host ID %d\n", id
);
451 spin_lock_irqsave(&ub_lock
, flags
);
452 if (ub_hostv
[id
] == 0) {
453 spin_unlock_irqrestore(&ub_lock
, flags
);
454 printk(KERN_ERR DRV_NAME
": freeing free host ID %d\n", id
);
458 spin_unlock_irqrestore(&ub_lock
, flags
);
462 * This is necessitated by the fact that blk_cleanup_queue does not
463 * necesserily destroy the queue. Instead, it may merely decrease q->refcnt.
464 * Since our blk_init_queue() passes a spinlock common with ub_dev,
465 * we have life time issues when ub_cleanup frees ub_dev.
467 static spinlock_t
*ub_next_lock(void)
472 spin_lock_irqsave(&ub_lock
, flags
);
473 ret
= &ub_qlockv
[ub_qlock_next
];
474 ub_qlock_next
= (ub_qlock_next
+ 1) % UB_QLOCK_NUM
;
475 spin_unlock_irqrestore(&ub_lock
, flags
);
480 * Downcount for deallocation. This rides on two assumptions:
481 * - once something is poisoned, its refcount cannot grow
482 * - opens cannot happen at this time (del_gendisk was done)
483 * If the above is true, we can drop the lock, which we need for
484 * blk_cleanup_queue(): the silly thing may attempt to sleep.
485 * [Actually, it never needs to sleep for us, but it calls might_sleep()]
487 static void ub_put(struct ub_dev
*sc
)
491 spin_lock_irqsave(&ub_lock
, flags
);
493 if (sc
->openc
== 0 && atomic_read(&sc
->poison
)) {
494 spin_unlock_irqrestore(&ub_lock
, flags
);
497 spin_unlock_irqrestore(&ub_lock
, flags
);
502 * Final cleanup and deallocation.
504 static void ub_cleanup(struct ub_dev
*sc
)
510 while (!list_empty(&sc
->luns
)) {
512 lun
= list_entry(p
, struct ub_lun
, link
);
515 /* I don't think queue can be NULL. But... Stolen from sx8.c */
516 if ((q
= lun
->disk
->queue
) != NULL
)
517 blk_cleanup_queue(q
);
519 * If we zero disk->private_data BEFORE put_disk, we have
520 * to check for NULL all over the place in open, release,
521 * check_media and revalidate, because the block level
522 * semaphore is well inside the put_disk.
523 * But we cannot zero after the call, because *disk is gone.
524 * The sd.c is blatantly racy in this area.
526 /* disk->private_data = NULL; */
534 usb_set_intfdata(sc
->intf
, NULL
);
535 usb_put_intf(sc
->intf
);
536 usb_put_dev(sc
->dev
);
541 * The "command allocator".
543 static struct ub_scsi_cmd
*ub_get_cmd(struct ub_lun
*lun
)
545 struct ub_scsi_cmd
*ret
;
554 static void ub_put_cmd(struct ub_lun
*lun
, struct ub_scsi_cmd
*cmd
)
556 if (cmd
!= &lun
->cmdv
[0]) {
557 printk(KERN_WARNING
"%s: releasing a foreign cmd %p\n",
562 printk(KERN_WARNING
"%s: releasing a free cmd\n", lun
->name
);
571 static void ub_cmdq_add(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
573 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
575 if (t
->qlen
++ == 0) {
583 if (t
->qlen
> t
->qmax
)
587 static void ub_cmdq_insert(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
589 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
591 if (t
->qlen
++ == 0) {
599 if (t
->qlen
> t
->qmax
)
603 static struct ub_scsi_cmd
*ub_cmdq_pop(struct ub_dev
*sc
)
605 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
606 struct ub_scsi_cmd
*cmd
;
618 #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head)
621 * The request function is our main entry point
624 static void ub_request_fn(request_queue_t
*q
)
626 struct ub_lun
*lun
= q
->queuedata
;
629 while ((rq
= elv_next_request(q
)) != NULL
) {
630 if (ub_request_fn_1(lun
, rq
) != 0) {
637 static int ub_request_fn_1(struct ub_lun
*lun
, struct request
*rq
)
639 struct ub_dev
*sc
= lun
->udev
;
640 struct ub_scsi_cmd
*cmd
;
641 struct ub_request
*urq
;
644 if (atomic_read(&sc
->poison
) || lun
->changed
) {
645 blkdev_dequeue_request(rq
);
650 if (lun
->urq
.rq
!= NULL
)
652 if ((cmd
= ub_get_cmd(lun
)) == NULL
)
654 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
656 blkdev_dequeue_request(rq
);
659 memset(urq
, 0, sizeof(struct ub_request
));
663 * get scatterlist from block layer
665 n_elem
= blk_rq_map_sg(lun
->disk
->queue
, rq
, &urq
->sgv
[0]);
667 /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */
668 printk(KERN_INFO
"%s: failed request map (%d)\n",
672 if (n_elem
> UB_MAX_REQ_SG
) { /* Paranoia */
673 printk(KERN_WARNING
"%s: request with %d segments\n",
678 sc
->sg_stat
[n_elem
< 5 ? n_elem
: 5]++;
680 if (blk_pc_request(rq
)) {
681 ub_cmd_build_packet(sc
, lun
, cmd
, urq
);
683 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
685 cmd
->state
= UB_CMDST_INIT
;
687 cmd
->done
= ub_rw_cmd_done
;
690 cmd
->tag
= sc
->tagcnt
++;
691 if (ub_submit_scsi(sc
, cmd
) != 0)
697 ub_put_cmd(lun
, cmd
);
702 static void ub_cmd_build_block(struct ub_dev
*sc
, struct ub_lun
*lun
,
703 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
705 struct request
*rq
= urq
->rq
;
706 unsigned int block
, nblks
;
708 if (rq_data_dir(rq
) == WRITE
)
709 cmd
->dir
= UB_DIR_WRITE
;
711 cmd
->dir
= UB_DIR_READ
;
714 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
719 * The call to blk_queue_hardsect_size() guarantees that request
720 * is aligned, but it is given in terms of 512 byte units, always.
722 block
= rq
->sector
>> lun
->capacity
.bshift
;
723 nblks
= rq
->nr_sectors
>> lun
->capacity
.bshift
;
725 cmd
->cdb
[0] = (cmd
->dir
== UB_DIR_READ
)? READ_10
: WRITE_10
;
726 /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
727 cmd
->cdb
[2] = block
>> 24;
728 cmd
->cdb
[3] = block
>> 16;
729 cmd
->cdb
[4] = block
>> 8;
731 cmd
->cdb
[7] = nblks
>> 8;
735 cmd
->len
= rq
->nr_sectors
* 512;
738 static void ub_cmd_build_packet(struct ub_dev
*sc
, struct ub_lun
*lun
,
739 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
741 struct request
*rq
= urq
->rq
;
743 if (rq
->data_len
== 0) {
744 cmd
->dir
= UB_DIR_NONE
;
746 if (rq_data_dir(rq
) == WRITE
)
747 cmd
->dir
= UB_DIR_WRITE
;
749 cmd
->dir
= UB_DIR_READ
;
753 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
755 memcpy(&cmd
->cdb
, rq
->cmd
, rq
->cmd_len
);
756 cmd
->cdb_len
= rq
->cmd_len
;
758 cmd
->len
= rq
->data_len
;
761 static void ub_rw_cmd_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
763 struct ub_lun
*lun
= cmd
->lun
;
764 struct ub_request
*urq
= cmd
->back
;
770 if (cmd
->error
== 0) {
773 if (blk_pc_request(rq
)) {
774 if (cmd
->act_len
>= rq
->data_len
)
777 rq
->data_len
-= cmd
->act_len
;
782 if (blk_pc_request(rq
)) {
783 /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
784 memcpy(rq
->sense
, sc
->top_sense
, UB_SENSE_SIZE
);
785 rq
->sense_len
= UB_SENSE_SIZE
;
786 if (sc
->top_sense
[0] != 0)
787 rq
->errors
= SAM_STAT_CHECK_CONDITION
;
789 rq
->errors
= DID_ERROR
<< 16;
791 if (cmd
->error
== -EIO
) {
792 if (ub_rw_cmd_retry(sc
, lun
, urq
, cmd
) == 0)
800 ub_put_cmd(lun
, cmd
);
801 ub_end_rq(rq
, uptodate
);
802 blk_start_queue(lun
->disk
->queue
);
805 static void ub_end_rq(struct request
*rq
, int uptodate
)
807 end_that_request_first(rq
, uptodate
, rq
->hard_nr_sectors
);
808 end_that_request_last(rq
, uptodate
);
811 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
812 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
)
815 if (atomic_read(&sc
->poison
))
818 ub_reset_enter(sc
, urq
->current_try
);
820 if (urq
->current_try
>= 3)
824 /* Remove this if anyone complains of flooding. */
825 printk(KERN_DEBUG
"%s: dir %c len/act %d/%d "
826 "[sense %x %02x %02x] retry %d\n",
827 sc
->name
, UB_DIR_CHAR(cmd
->dir
), cmd
->len
, cmd
->act_len
,
828 cmd
->key
, cmd
->asc
, cmd
->ascq
, urq
->current_try
);
830 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
831 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
833 cmd
->state
= UB_CMDST_INIT
;
835 cmd
->done
= ub_rw_cmd_done
;
838 cmd
->tag
= sc
->tagcnt
++;
841 return ub_submit_scsi(sc
, cmd
);
843 ub_cmdq_add(sc
, cmd
);
849 * Submit a regular SCSI operation (not an auto-sense).
851 * The Iron Law of Good Submit Routine is:
852 * Zero return - callback is done, Nonzero return - callback is not done.
855 * Host is assumed locked.
857 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
860 if (cmd
->state
!= UB_CMDST_INIT
||
861 (cmd
->dir
!= UB_DIR_NONE
&& cmd
->len
== 0)) {
865 ub_cmdq_add(sc
, cmd
);
867 * We can call ub_scsi_dispatch(sc) right away here, but it's a little
868 * safer to jump to a tasklet, in case upper layers do something silly.
870 tasklet_schedule(&sc
->tasklet
);
875 * Submit the first URB for the queued command.
876 * This function does not deal with queueing in any way.
878 static int ub_scsi_cmd_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
880 struct bulk_cb_wrap
*bcb
;
886 * ``If the allocation length is eighteen or greater, and a device
887 * server returns less than eithteen bytes of data, the application
888 * client should assume that the bytes not transferred would have been
889 * zeroes had the device server returned those bytes.''
891 * We zero sense for all commands so that when a packet request
892 * fails it does not return a stale sense.
894 memset(&sc
->top_sense
, 0, UB_SENSE_SIZE
);
896 /* set up the command wrapper */
897 bcb
->Signature
= cpu_to_le32(US_BULK_CB_SIGN
);
898 bcb
->Tag
= cmd
->tag
; /* Endianness is not important */
899 bcb
->DataTransferLength
= cpu_to_le32(cmd
->len
);
900 bcb
->Flags
= (cmd
->dir
== UB_DIR_READ
) ? 0x80 : 0;
901 bcb
->Lun
= (cmd
->lun
!= NULL
) ? cmd
->lun
->num
: 0;
902 bcb
->Length
= cmd
->cdb_len
;
904 /* copy the command payload */
905 memcpy(bcb
->CDB
, cmd
->cdb
, UB_MAX_CDB_SIZE
);
907 UB_INIT_COMPLETION(sc
->work_done
);
909 sc
->last_pipe
= sc
->send_bulk_pipe
;
910 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->send_bulk_pipe
,
911 bcb
, US_BULK_CB_WRAP_LEN
, ub_urb_complete
, sc
);
913 /* Fill what we shouldn't be filling, because usb-storage did so. */
914 sc
->work_urb
.actual_length
= 0;
915 sc
->work_urb
.error_count
= 0;
916 sc
->work_urb
.status
= 0;
918 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
919 /* XXX Clear stalls */
920 ub_complete(&sc
->work_done
);
924 sc
->work_timer
.expires
= jiffies
+ UB_URB_TIMEOUT
;
925 add_timer(&sc
->work_timer
);
927 cmd
->state
= UB_CMDST_CMD
;
934 static void ub_urb_timeout(unsigned long arg
)
936 struct ub_dev
*sc
= (struct ub_dev
*) arg
;
939 spin_lock_irqsave(sc
->lock
, flags
);
940 if (!ub_is_completed(&sc
->work_done
))
941 usb_unlink_urb(&sc
->work_urb
);
942 spin_unlock_irqrestore(sc
->lock
, flags
);
946 * Completion routine for the work URB.
948 * This can be called directly from usb_submit_urb (while we have
949 * the sc->lock taken) and from an interrupt (while we do NOT have
950 * the sc->lock taken). Therefore, bounce this off to a tasklet.
952 static void ub_urb_complete(struct urb
*urb
, struct pt_regs
*pt
)
954 struct ub_dev
*sc
= urb
->context
;
956 ub_complete(&sc
->work_done
);
957 tasklet_schedule(&sc
->tasklet
);
960 static void ub_scsi_action(unsigned long _dev
)
962 struct ub_dev
*sc
= (struct ub_dev
*) _dev
;
965 spin_lock_irqsave(sc
->lock
, flags
);
966 ub_scsi_dispatch(sc
);
967 spin_unlock_irqrestore(sc
->lock
, flags
);
970 static void ub_scsi_dispatch(struct ub_dev
*sc
)
972 struct ub_scsi_cmd
*cmd
;
975 while (!sc
->reset
&& (cmd
= ub_cmdq_peek(sc
)) != NULL
) {
976 if (cmd
->state
== UB_CMDST_DONE
) {
978 (*cmd
->done
)(sc
, cmd
);
979 } else if (cmd
->state
== UB_CMDST_INIT
) {
980 if ((rc
= ub_scsi_cmd_start(sc
, cmd
)) == 0)
983 cmd
->state
= UB_CMDST_DONE
;
985 if (!ub_is_completed(&sc
->work_done
))
987 del_timer(&sc
->work_timer
);
988 ub_scsi_urb_compl(sc
, cmd
);
993 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
995 struct urb
*urb
= &sc
->work_urb
;
996 struct bulk_cs_wrap
*bcs
;
1000 if (atomic_read(&sc
->poison
)) {
1001 ub_state_done(sc
, cmd
, -ENODEV
);
1005 if (cmd
->state
== UB_CMDST_CLEAR
) {
1006 if (urb
->status
== -EPIPE
) {
1008 * STALL while clearning STALL.
1009 * The control pipe clears itself - nothing to do.
1011 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1017 * We ignore the result for the halt clear.
1020 /* reset the endpoint toggle */
1021 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1022 usb_pipeout(sc
->last_pipe
), 0);
1024 ub_state_sense(sc
, cmd
);
1026 } else if (cmd
->state
== UB_CMDST_CLR2STS
) {
1027 if (urb
->status
== -EPIPE
) {
1028 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1034 * We ignore the result for the halt clear.
1037 /* reset the endpoint toggle */
1038 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1039 usb_pipeout(sc
->last_pipe
), 0);
1041 ub_state_stat(sc
, cmd
);
1043 } else if (cmd
->state
== UB_CMDST_CLRRS
) {
1044 if (urb
->status
== -EPIPE
) {
1045 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1051 * We ignore the result for the halt clear.
1054 /* reset the endpoint toggle */
1055 usb_settoggle(sc
->dev
, usb_pipeendpoint(sc
->last_pipe
),
1056 usb_pipeout(sc
->last_pipe
), 0);
1058 ub_state_stat_counted(sc
, cmd
);
1060 } else if (cmd
->state
== UB_CMDST_CMD
) {
1061 switch (urb
->status
) {
1067 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1069 printk(KERN_NOTICE
"%s: "
1070 "unable to submit clear (%d)\n",
1073 * This is typically ENOMEM or some other such shit.
1074 * Retrying is pointless. Just do Bad End on it...
1076 ub_state_done(sc
, cmd
, rc
);
1079 cmd
->state
= UB_CMDST_CLEAR
;
1081 case -ESHUTDOWN
: /* unplug */
1082 case -EILSEQ
: /* unplug timeout on uhci */
1083 ub_state_done(sc
, cmd
, -ENODEV
);
1088 if (urb
->actual_length
!= US_BULK_CB_WRAP_LEN
) {
1092 if (cmd
->dir
== UB_DIR_NONE
|| cmd
->nsg
< 1) {
1093 ub_state_stat(sc
, cmd
);
1097 // udelay(125); // usb-storage has this
1098 ub_data_start(sc
, cmd
);
1100 } else if (cmd
->state
== UB_CMDST_DATA
) {
1101 if (urb
->status
== -EPIPE
) {
1102 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1104 printk(KERN_NOTICE
"%s: "
1105 "unable to submit clear (%d)\n",
1107 ub_state_done(sc
, cmd
, rc
);
1110 cmd
->state
= UB_CMDST_CLR2STS
;
1113 if (urb
->status
== -EOVERFLOW
) {
1115 * A babble? Failure, but we must transfer CSW now.
1117 cmd
->error
= -EOVERFLOW
; /* A cheap trick... */
1118 ub_state_stat(sc
, cmd
);
1122 if (cmd
->dir
== UB_DIR_WRITE
) {
1124 * Do not continue writes in case of a failure.
1125 * Doing so would cause sectors to be mixed up,
1126 * which is worse than sectors lost.
1128 * We must try to read the CSW, or many devices
1131 len
= urb
->actual_length
;
1132 if (urb
->status
!= 0 ||
1133 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1134 cmd
->act_len
+= len
;
1137 ub_state_stat(sc
, cmd
);
1143 * If an error occurs on read, we record it, and
1144 * continue to fetch data in order to avoid bubble.
1146 * As a small shortcut, we stop if we detect that
1147 * a CSW mixed into data.
1149 if (urb
->status
!= 0)
1152 len
= urb
->actual_length
;
1153 if (urb
->status
!= 0 ||
1154 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1155 if ((len
& 0x1FF) == US_BULK_CS_WRAP_LEN
)
1160 cmd
->act_len
+= urb
->actual_length
;
1162 if (++cmd
->current_sg
< cmd
->nsg
) {
1163 ub_data_start(sc
, cmd
);
1166 ub_state_stat(sc
, cmd
);
1168 } else if (cmd
->state
== UB_CMDST_STAT
) {
1169 if (urb
->status
== -EPIPE
) {
1170 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1172 printk(KERN_NOTICE
"%s: "
1173 "unable to submit clear (%d)\n",
1175 ub_state_done(sc
, cmd
, rc
);
1180 * Having a stall when getting CSW is an error, so
1181 * make sure uppper levels are not oblivious to it.
1183 cmd
->error
= -EIO
; /* A cheap trick... */
1185 cmd
->state
= UB_CMDST_CLRRS
;
1189 /* Catch everything, including -EOVERFLOW and other nasties. */
1190 if (urb
->status
!= 0)
1193 if (urb
->actual_length
== 0) {
1194 ub_state_stat_counted(sc
, cmd
);
1199 * Check the returned Bulk protocol status.
1200 * The status block has to be validated first.
1203 bcs
= &sc
->work_bcs
;
1205 if (sc
->signature
== cpu_to_le32(0)) {
1207 * This is the first reply, so do not perform the check.
1208 * Instead, remember the signature the device uses
1209 * for future checks. But do not allow a nul.
1211 sc
->signature
= bcs
->Signature
;
1212 if (sc
->signature
== cpu_to_le32(0)) {
1213 ub_state_stat_counted(sc
, cmd
);
1217 if (bcs
->Signature
!= sc
->signature
) {
1218 ub_state_stat_counted(sc
, cmd
);
1223 if (bcs
->Tag
!= cmd
->tag
) {
1225 * This usually happens when we disagree with the
1226 * device's microcode about something. For instance,
1227 * a few of them throw this after timeouts. They buffer
1228 * commands and reply at commands we timed out before.
1229 * Without flushing these replies we loop forever.
1231 ub_state_stat_counted(sc
, cmd
);
1235 len
= le32_to_cpu(bcs
->Residue
);
1236 if (len
!= cmd
->len
- cmd
->act_len
) {
1238 * It is all right to transfer less, the caller has
1239 * to check. But it's not all right if the device
1240 * counts disagree with our counts.
1245 switch (bcs
->Status
) {
1246 case US_BULK_STAT_OK
:
1248 case US_BULK_STAT_FAIL
:
1249 ub_state_sense(sc
, cmd
);
1251 case US_BULK_STAT_PHASE
:
1254 printk(KERN_INFO
"%s: unknown CSW status 0x%x\n",
1255 sc
->name
, bcs
->Status
);
1256 ub_state_done(sc
, cmd
, -EINVAL
);
1260 /* Not zeroing error to preserve a babble indicator */
1261 if (cmd
->error
!= 0) {
1262 ub_state_sense(sc
, cmd
);
1265 cmd
->state
= UB_CMDST_DONE
;
1267 (*cmd
->done
)(sc
, cmd
);
1269 } else if (cmd
->state
== UB_CMDST_SENSE
) {
1270 ub_state_done(sc
, cmd
, -EIO
);
1273 printk(KERN_WARNING
"%s: "
1274 "wrong command state %d\n",
1275 sc
->name
, cmd
->state
);
1276 ub_state_done(sc
, cmd
, -EINVAL
);
1281 Bad_End
: /* Little Excel is dead */
1282 ub_state_done(sc
, cmd
, -EIO
);
1286 * Factorization helper for the command state machine:
1287 * Initiate a data segment transfer.
1289 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1291 struct scatterlist
*sg
= &cmd
->sgv
[cmd
->current_sg
];
1295 UB_INIT_COMPLETION(sc
->work_done
);
1297 if (cmd
->dir
== UB_DIR_READ
)
1298 pipe
= sc
->recv_bulk_pipe
;
1300 pipe
= sc
->send_bulk_pipe
;
1301 sc
->last_pipe
= pipe
;
1302 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, pipe
,
1303 page_address(sg
->page
) + sg
->offset
, sg
->length
,
1304 ub_urb_complete
, sc
);
1305 sc
->work_urb
.actual_length
= 0;
1306 sc
->work_urb
.error_count
= 0;
1307 sc
->work_urb
.status
= 0;
1309 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1310 /* XXX Clear stalls */
1311 ub_complete(&sc
->work_done
);
1312 ub_state_done(sc
, cmd
, rc
);
1316 sc
->work_timer
.expires
= jiffies
+ UB_DATA_TIMEOUT
;
1317 add_timer(&sc
->work_timer
);
1319 cmd
->state
= UB_CMDST_DATA
;
1323 * Factorization helper for the command state machine:
1324 * Finish the command.
1326 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
)
1330 cmd
->state
= UB_CMDST_DONE
;
1332 (*cmd
->done
)(sc
, cmd
);
1336 * Factorization helper for the command state machine:
1337 * Submit a CSW read.
1339 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1343 UB_INIT_COMPLETION(sc
->work_done
);
1345 sc
->last_pipe
= sc
->recv_bulk_pipe
;
1346 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_bulk_pipe
,
1347 &sc
->work_bcs
, US_BULK_CS_WRAP_LEN
, ub_urb_complete
, sc
);
1348 sc
->work_urb
.actual_length
= 0;
1349 sc
->work_urb
.error_count
= 0;
1350 sc
->work_urb
.status
= 0;
1352 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1353 /* XXX Clear stalls */
1354 ub_complete(&sc
->work_done
);
1355 ub_state_done(sc
, cmd
, rc
);
1359 sc
->work_timer
.expires
= jiffies
+ UB_STAT_TIMEOUT
;
1360 add_timer(&sc
->work_timer
);
1365 * Factorization helper for the command state machine:
1366 * Submit a CSW read and go to STAT state.
1368 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1371 if (__ub_state_stat(sc
, cmd
) != 0)
1374 cmd
->stat_count
= 0;
1375 cmd
->state
= UB_CMDST_STAT
;
1379 * Factorization helper for the command state machine:
1380 * Submit a CSW read and go to STAT state with counter (along [C] path).
1382 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1385 if (++cmd
->stat_count
>= 4) {
1386 ub_state_sense(sc
, cmd
);
1390 if (__ub_state_stat(sc
, cmd
) != 0)
1393 cmd
->state
= UB_CMDST_STAT
;
1397 * Factorization helper for the command state machine:
1398 * Submit a REQUEST SENSE and go to SENSE state.
1400 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1402 struct ub_scsi_cmd
*scmd
;
1403 struct scatterlist
*sg
;
1406 if (cmd
->cdb
[0] == REQUEST_SENSE
) {
1411 scmd
= &sc
->top_rqs_cmd
;
1412 memset(scmd
, 0, sizeof(struct ub_scsi_cmd
));
1413 scmd
->cdb
[0] = REQUEST_SENSE
;
1414 scmd
->cdb
[4] = UB_SENSE_SIZE
;
1416 scmd
->dir
= UB_DIR_READ
;
1417 scmd
->state
= UB_CMDST_INIT
;
1420 sg
->page
= virt_to_page(sc
->top_sense
);
1421 sg
->offset
= (unsigned long)sc
->top_sense
& (PAGE_SIZE
-1);
1422 sg
->length
= UB_SENSE_SIZE
;
1423 scmd
->len
= UB_SENSE_SIZE
;
1424 scmd
->lun
= cmd
->lun
;
1425 scmd
->done
= ub_top_sense_done
;
1428 scmd
->tag
= sc
->tagcnt
++;
1430 cmd
->state
= UB_CMDST_SENSE
;
1432 ub_cmdq_insert(sc
, scmd
);
1436 ub_state_done(sc
, cmd
, rc
);
1440 * A helper for the command's state machine:
1441 * Submit a stall clear.
1443 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
1447 struct usb_ctrlrequest
*cr
;
1450 endp
= usb_pipeendpoint(stalled_pipe
);
1451 if (usb_pipein (stalled_pipe
))
1455 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
1456 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
1457 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
1458 cr
->wIndex
= cpu_to_le16(endp
);
1459 cr
->wLength
= cpu_to_le16(0);
1461 UB_INIT_COMPLETION(sc
->work_done
);
1463 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1464 (unsigned char*) cr
, NULL
, 0, ub_urb_complete
, sc
);
1465 sc
->work_urb
.actual_length
= 0;
1466 sc
->work_urb
.error_count
= 0;
1467 sc
->work_urb
.status
= 0;
1469 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1470 ub_complete(&sc
->work_done
);
1474 sc
->work_timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1475 add_timer(&sc
->work_timer
);
1481 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
)
1483 unsigned char *sense
= sc
->top_sense
;
1484 struct ub_scsi_cmd
*cmd
;
1487 * Find the command which triggered the unit attention or a check,
1488 * save the sense into it, and advance its state machine.
1490 if ((cmd
= ub_cmdq_peek(sc
)) == NULL
) {
1491 printk(KERN_WARNING
"%s: sense done while idle\n", sc
->name
);
1494 if (cmd
!= scmd
->back
) {
1495 printk(KERN_WARNING
"%s: "
1496 "sense done for wrong command 0x%x\n",
1497 sc
->name
, cmd
->tag
);
1500 if (cmd
->state
!= UB_CMDST_SENSE
) {
1501 printk(KERN_WARNING
"%s: "
1502 "sense done with bad cmd state %d\n",
1503 sc
->name
, cmd
->state
);
1508 * Ignoring scmd->act_len, because the buffer was pre-zeroed.
1510 cmd
->key
= sense
[2] & 0x0F;
1511 cmd
->asc
= sense
[12];
1512 cmd
->ascq
= sense
[13];
1514 ub_scsi_urb_compl(sc
, cmd
);
1519 * XXX Move usb_reset_device to khubd. Hogging kevent is not a good thing.
1520 * XXX Make usb_sync_reset asynchronous.
1523 static void ub_reset_enter(struct ub_dev
*sc
, int try)
1527 /* This happens often on multi-LUN devices. */
1530 sc
->reset
= try + 1;
1532 #if 0 /* Not needed because the disconnect waits for us. */
1533 unsigned long flags
;
1534 spin_lock_irqsave(&ub_lock
, flags
);
1536 spin_unlock_irqrestore(&ub_lock
, flags
);
1539 #if 0 /* We let them stop themselves. */
1540 struct list_head
*p
;
1542 list_for_each(p
, &sc
->luns
) {
1543 lun
= list_entry(p
, struct ub_lun
, link
);
1544 blk_stop_queue(lun
->disk
->queue
);
1548 schedule_work(&sc
->reset_work
);
1551 static void ub_reset_task(void *arg
)
1553 struct ub_dev
*sc
= arg
;
1554 unsigned long flags
;
1555 struct list_head
*p
;
1560 printk(KERN_WARNING
"%s: Running reset unrequested\n",
1565 if (atomic_read(&sc
->poison
)) {
1567 } else if ((sc
->reset
& 1) == 0) {
1569 msleep(700); /* usb-storage sleeps 6s (!) */
1570 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
1571 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
1572 } else if (sc
->dev
->actconfig
->desc
.bNumInterfaces
!= 1) {
1575 if ((lkr
= usb_lock_device_for_reset(sc
->dev
, sc
->intf
)) < 0) {
1577 "%s: usb_lock_device_for_reset failed (%d)\n",
1580 rc
= usb_reset_device(sc
->dev
);
1582 printk(KERN_NOTICE
"%s: "
1583 "usb_lock_device_for_reset failed (%d)\n",
1588 usb_unlock_device(sc
->dev
);
1593 * In theory, no commands can be running while reset is active,
1594 * so nobody can ask for another reset, and so we do not need any
1595 * queues of resets or anything. We do need a spinlock though,
1596 * to interact with block layer.
1598 spin_lock_irqsave(sc
->lock
, flags
);
1600 tasklet_schedule(&sc
->tasklet
);
1601 list_for_each(p
, &sc
->luns
) {
1602 lun
= list_entry(p
, struct ub_lun
, link
);
1603 blk_start_queue(lun
->disk
->queue
);
1605 wake_up(&sc
->reset_wait
);
1606 spin_unlock_irqrestore(sc
->lock
, flags
);
1610 * This is called from a process context.
1612 static void ub_revalidate(struct ub_dev
*sc
, struct ub_lun
*lun
)
1615 lun
->readonly
= 0; /* XXX Query this from the device */
1617 lun
->capacity
.nsec
= 0;
1618 lun
->capacity
.bsize
= 512;
1619 lun
->capacity
.bshift
= 0;
1621 if (ub_sync_tur(sc
, lun
) != 0)
1622 return; /* Not ready */
1625 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1627 * The retry here means something is wrong, either with the
1628 * device, with the transport, or with our code.
1629 * We keep this because sd.c has retries for capacity.
1631 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1632 lun
->capacity
.nsec
= 0;
1633 lun
->capacity
.bsize
= 512;
1634 lun
->capacity
.bshift
= 0;
1641 * This is mostly needed to keep refcounting, but also to support
1642 * media checks on removable media drives.
1644 static int ub_bd_open(struct inode
*inode
, struct file
*filp
)
1646 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1647 struct ub_lun
*lun
= disk
->private_data
;
1648 struct ub_dev
*sc
= lun
->udev
;
1649 unsigned long flags
;
1652 spin_lock_irqsave(&ub_lock
, flags
);
1653 if (atomic_read(&sc
->poison
)) {
1654 spin_unlock_irqrestore(&ub_lock
, flags
);
1658 spin_unlock_irqrestore(&ub_lock
, flags
);
1660 if (lun
->removable
|| lun
->readonly
)
1661 check_disk_change(inode
->i_bdev
);
1664 * The sd.c considers ->media_present and ->changed not equivalent,
1665 * under some pretty murky conditions (a failure of READ CAPACITY).
1666 * We may need it one day.
1668 if (lun
->removable
&& lun
->changed
&& !(filp
->f_flags
& O_NDELAY
)) {
1673 if (lun
->readonly
&& (filp
->f_mode
& FMODE_WRITE
)) {
1687 static int ub_bd_release(struct inode
*inode
, struct file
*filp
)
1689 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1690 struct ub_lun
*lun
= disk
->private_data
;
1691 struct ub_dev
*sc
= lun
->udev
;
1698 * The ioctl interface.
1700 static int ub_bd_ioctl(struct inode
*inode
, struct file
*filp
,
1701 unsigned int cmd
, unsigned long arg
)
1703 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
1704 void __user
*usermem
= (void __user
*) arg
;
1706 return scsi_cmd_ioctl(filp
, disk
, cmd
, usermem
);
1710 * This is called once a new disk was seen by the block layer or by ub_probe().
1711 * The main onjective here is to discover the features of the media such as
1712 * the capacity, read-only status, etc. USB storage generally does not
1713 * need to be spun up, but if we needed it, this would be the place.
1715 * This call can sleep.
1717 * The return code is not used.
1719 static int ub_bd_revalidate(struct gendisk
*disk
)
1721 struct ub_lun
*lun
= disk
->private_data
;
1723 ub_revalidate(lun
->udev
, lun
);
1725 /* XXX Support sector size switching like in sr.c */
1726 blk_queue_hardsect_size(disk
->queue
, lun
->capacity
.bsize
);
1727 set_capacity(disk
, lun
->capacity
.nsec
);
1728 // set_disk_ro(sdkp->disk, lun->readonly);
1734 * The check is called by the block layer to verify if the media
1735 * is still available. It is supposed to be harmless, lightweight and
1736 * non-intrusive in case the media was not changed.
1738 * This call can sleep.
1740 * The return code is bool!
1742 static int ub_bd_media_changed(struct gendisk
*disk
)
1744 struct ub_lun
*lun
= disk
->private_data
;
1746 if (!lun
->removable
)
1750 * We clean checks always after every command, so this is not
1751 * as dangerous as it looks. If the TEST_UNIT_READY fails here,
1752 * the device is actually not ready with operator or software
1753 * intervention required. One dangerous item might be a drive which
1754 * spins itself down, and come the time to write dirty pages, this
1755 * will fail, then block layer discards the data. Since we never
1756 * spin drives up, such devices simply cannot be used with ub anyway.
1758 if (ub_sync_tur(lun
->udev
, lun
) != 0) {
1763 return lun
->changed
;
1766 static struct block_device_operations ub_bd_fops
= {
1767 .owner
= THIS_MODULE
,
1769 .release
= ub_bd_release
,
1770 .ioctl
= ub_bd_ioctl
,
1771 .media_changed
= ub_bd_media_changed
,
1772 .revalidate_disk
= ub_bd_revalidate
,
1776 * Common ->done routine for commands executed synchronously.
1778 static void ub_probe_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1780 struct completion
*cop
= cmd
->back
;
1785 * Test if the device has a check condition on it, synchronously.
1787 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
)
1789 struct ub_scsi_cmd
*cmd
;
1790 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) };
1791 unsigned long flags
;
1792 struct completion
compl;
1795 init_completion(&compl);
1798 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1801 cmd
->cdb
[0] = TEST_UNIT_READY
;
1803 cmd
->dir
= UB_DIR_NONE
;
1804 cmd
->state
= UB_CMDST_INIT
;
1805 cmd
->lun
= lun
; /* This may be NULL, but that's ok */
1806 cmd
->done
= ub_probe_done
;
1809 spin_lock_irqsave(sc
->lock
, flags
);
1810 cmd
->tag
= sc
->tagcnt
++;
1812 rc
= ub_submit_scsi(sc
, cmd
);
1813 spin_unlock_irqrestore(sc
->lock
, flags
);
1818 wait_for_completion(&compl);
1822 if (rc
== -EIO
&& cmd
->key
!= 0) /* Retries for benh's key */
1832 * Read the SCSI capacity synchronously (for probing).
1834 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
1835 struct ub_capacity
*ret
)
1837 struct ub_scsi_cmd
*cmd
;
1838 struct scatterlist
*sg
;
1840 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) + 8 };
1841 unsigned long flags
;
1842 unsigned int bsize
, shift
;
1844 struct completion
compl;
1847 init_completion(&compl);
1850 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1852 p
= (char *)cmd
+ sizeof(struct ub_scsi_cmd
);
1856 cmd
->dir
= UB_DIR_READ
;
1857 cmd
->state
= UB_CMDST_INIT
;
1860 sg
->page
= virt_to_page(p
);
1861 sg
->offset
= (unsigned long)p
& (PAGE_SIZE
-1);
1865 cmd
->done
= ub_probe_done
;
1868 spin_lock_irqsave(sc
->lock
, flags
);
1869 cmd
->tag
= sc
->tagcnt
++;
1871 rc
= ub_submit_scsi(sc
, cmd
);
1872 spin_unlock_irqrestore(sc
->lock
, flags
);
1877 wait_for_completion(&compl);
1879 if (cmd
->error
!= 0) {
1883 if (cmd
->act_len
!= 8) {
1888 /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */
1889 nsec
= be32_to_cpu(*(__be32
*)p
) + 1;
1890 bsize
= be32_to_cpu(*(__be32
*)(p
+ 4));
1892 case 512: shift
= 0; break;
1893 case 1024: shift
= 1; break;
1894 case 2048: shift
= 2; break;
1895 case 4096: shift
= 3; break;
1902 ret
->bshift
= shift
;
1903 ret
->nsec
= nsec
<< shift
;
1916 static void ub_probe_urb_complete(struct urb
*urb
, struct pt_regs
*pt
)
1918 struct completion
*cop
= urb
->context
;
1922 static void ub_probe_timeout(unsigned long arg
)
1924 struct completion
*cop
= (struct completion
*) arg
;
1929 * Reset with a Bulk reset.
1931 static int ub_sync_reset(struct ub_dev
*sc
)
1933 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
1934 struct usb_ctrlrequest
*cr
;
1935 struct completion
compl;
1936 struct timer_list timer
;
1939 init_completion(&compl);
1942 cr
->bRequestType
= USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
1943 cr
->bRequest
= US_BULK_RESET_REQUEST
;
1944 cr
->wValue
= cpu_to_le16(0);
1945 cr
->wIndex
= cpu_to_le16(ifnum
);
1946 cr
->wLength
= cpu_to_le16(0);
1948 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1949 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
1950 sc
->work_urb
.actual_length
= 0;
1951 sc
->work_urb
.error_count
= 0;
1952 sc
->work_urb
.status
= 0;
1954 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
1956 "%s: Unable to submit a bulk reset (%d)\n", sc
->name
, rc
);
1961 timer
.function
= ub_probe_timeout
;
1962 timer
.data
= (unsigned long) &compl;
1963 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1966 wait_for_completion(&compl);
1968 del_timer_sync(&timer
);
1969 usb_kill_urb(&sc
->work_urb
);
1971 return sc
->work_urb
.status
;
1975 * Get number of LUNs by the way of Bulk GetMaxLUN command.
1977 static int ub_sync_getmaxlun(struct ub_dev
*sc
)
1979 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
1981 enum { ALLOC_SIZE
= 1 };
1982 struct usb_ctrlrequest
*cr
;
1983 struct completion
compl;
1984 struct timer_list timer
;
1988 init_completion(&compl);
1991 if ((p
= kmalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1996 cr
->bRequestType
= USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
1997 cr
->bRequest
= US_BULK_GET_MAX_LUN
;
1998 cr
->wValue
= cpu_to_le16(0);
1999 cr
->wIndex
= cpu_to_le16(ifnum
);
2000 cr
->wLength
= cpu_to_le16(1);
2002 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_ctrl_pipe
,
2003 (unsigned char*) cr
, p
, 1, ub_probe_urb_complete
, &compl);
2004 sc
->work_urb
.actual_length
= 0;
2005 sc
->work_urb
.error_count
= 0;
2006 sc
->work_urb
.status
= 0;
2008 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0)
2012 timer
.function
= ub_probe_timeout
;
2013 timer
.data
= (unsigned long) &compl;
2014 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2017 wait_for_completion(&compl);
2019 del_timer_sync(&timer
);
2020 usb_kill_urb(&sc
->work_urb
);
2022 if ((rc
= sc
->work_urb
.status
) < 0)
2025 if (sc
->work_urb
.actual_length
!= 1) {
2028 if ((nluns
= *p
) == 55) {
2031 /* GetMaxLUN returns the maximum LUN number */
2033 if (nluns
> UB_MAX_LUNS
)
2034 nluns
= UB_MAX_LUNS
;
2049 * Clear initial stalls.
2051 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
)
2054 struct usb_ctrlrequest
*cr
;
2055 struct completion
compl;
2056 struct timer_list timer
;
2059 init_completion(&compl);
2061 endp
= usb_pipeendpoint(stalled_pipe
);
2062 if (usb_pipein (stalled_pipe
))
2066 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
2067 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
2068 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
2069 cr
->wIndex
= cpu_to_le16(endp
);
2070 cr
->wLength
= cpu_to_le16(0);
2072 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
2073 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
2074 sc
->work_urb
.actual_length
= 0;
2075 sc
->work_urb
.error_count
= 0;
2076 sc
->work_urb
.status
= 0;
2078 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
2080 "%s: Unable to submit a probe clear (%d)\n", sc
->name
, rc
);
2085 timer
.function
= ub_probe_timeout
;
2086 timer
.data
= (unsigned long) &compl;
2087 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2090 wait_for_completion(&compl);
2092 del_timer_sync(&timer
);
2093 usb_kill_urb(&sc
->work_urb
);
2095 /* reset the endpoint toggle */
2096 usb_settoggle(sc
->dev
, endp
, usb_pipeout(sc
->last_pipe
), 0);
2102 * Get the pipe settings.
2104 static int ub_get_pipes(struct ub_dev
*sc
, struct usb_device
*dev
,
2105 struct usb_interface
*intf
)
2107 struct usb_host_interface
*altsetting
= intf
->cur_altsetting
;
2108 struct usb_endpoint_descriptor
*ep_in
= NULL
;
2109 struct usb_endpoint_descriptor
*ep_out
= NULL
;
2110 struct usb_endpoint_descriptor
*ep
;
2114 * Find the endpoints we need.
2115 * We are expecting a minimum of 2 endpoints - in and out (bulk).
2116 * We will ignore any others.
2118 for (i
= 0; i
< altsetting
->desc
.bNumEndpoints
; i
++) {
2119 ep
= &altsetting
->endpoint
[i
].desc
;
2121 /* Is it a BULK endpoint? */
2122 if ((ep
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
2123 == USB_ENDPOINT_XFER_BULK
) {
2124 /* BULK in or out? */
2125 if (ep
->bEndpointAddress
& USB_DIR_IN
)
2132 if (ep_in
== NULL
|| ep_out
== NULL
) {
2133 printk(KERN_NOTICE
"%s: failed endpoint check\n",
2138 /* Calculate and store the pipe values */
2139 sc
->send_ctrl_pipe
= usb_sndctrlpipe(dev
, 0);
2140 sc
->recv_ctrl_pipe
= usb_rcvctrlpipe(dev
, 0);
2141 sc
->send_bulk_pipe
= usb_sndbulkpipe(dev
,
2142 ep_out
->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
2143 sc
->recv_bulk_pipe
= usb_rcvbulkpipe(dev
,
2144 ep_in
->bEndpointAddress
& USB_ENDPOINT_NUMBER_MASK
);
2150 * Probing is done in the process context, which allows us to cheat
2151 * and not to build a state machine for the discovery.
2153 static int ub_probe(struct usb_interface
*intf
,
2154 const struct usb_device_id
*dev_id
)
2161 if (usb_usual_check_type(dev_id
, USB_US_TYPE_UB
))
2165 if ((sc
= kzalloc(sizeof(struct ub_dev
), GFP_KERNEL
)) == NULL
)
2167 sc
->lock
= ub_next_lock();
2168 INIT_LIST_HEAD(&sc
->luns
);
2169 usb_init_urb(&sc
->work_urb
);
2170 tasklet_init(&sc
->tasklet
, ub_scsi_action
, (unsigned long)sc
);
2171 atomic_set(&sc
->poison
, 0);
2172 INIT_WORK(&sc
->reset_work
, ub_reset_task
, sc
);
2173 init_waitqueue_head(&sc
->reset_wait
);
2175 init_timer(&sc
->work_timer
);
2176 sc
->work_timer
.data
= (unsigned long) sc
;
2177 sc
->work_timer
.function
= ub_urb_timeout
;
2179 ub_init_completion(&sc
->work_done
);
2180 sc
->work_done
.done
= 1; /* A little yuk, but oh well... */
2182 sc
->dev
= interface_to_usbdev(intf
);
2184 // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2185 usb_set_intfdata(intf
, sc
);
2186 usb_get_dev(sc
->dev
);
2188 * Since we give the interface struct to the block level through
2189 * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent
2190 * oopses on close after a disconnect (kernels 2.6.16 and up).
2192 usb_get_intf(sc
->intf
);
2194 snprintf(sc
->name
, 12, DRV_NAME
"(%d.%d)",
2195 sc
->dev
->bus
->busnum
, sc
->dev
->devnum
);
2197 /* XXX Verify that we can handle the device (from descriptors) */
2199 if (ub_get_pipes(sc
, sc
->dev
, intf
) != 0)
2203 * At this point, all USB initialization is done, do upper layer.
2204 * We really hate halfway initialized structures, so from the
2205 * invariants perspective, this ub_dev is fully constructed at
2210 * This is needed to clear toggles. It is a problem only if we do
2211 * `rmmod ub && modprobe ub` without disconnects, but we like that.
2213 #if 0 /* iPod Mini fails if we do this (big white iPod works) */
2214 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
2215 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
2219 * The way this is used by the startup code is a little specific.
2220 * A SCSI check causes a USB stall. Our common case code sees it
2221 * and clears the check, after which the device is ready for use.
2222 * But if a check was not present, any command other than
2223 * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE).
2225 * If we neglect to clear the SCSI check, the first real command fails
2226 * (which is the capacity readout). We clear that and retry, but why
2227 * causing spurious retries for no reason.
2229 * Revalidation may start with its own TEST_UNIT_READY, but that one
2230 * has to succeed, so we clear checks with an additional one here.
2231 * In any case it's not our business how revaliadation is implemented.
2233 for (i
= 0; i
< 3; i
++) { /* Retries for the schwag key from KS'04 */
2234 if ((rc
= ub_sync_tur(sc
, NULL
)) <= 0) break;
2235 if (rc
!= 0x6) break;
2240 for (i
= 0; i
< 3; i
++) {
2241 if ((rc
= ub_sync_getmaxlun(sc
)) < 0)
2250 for (i
= 0; i
< nluns
; i
++) {
2251 ub_probe_lun(sc
, i
);
2256 usb_set_intfdata(intf
, NULL
);
2257 usb_put_intf(sc
->intf
);
2258 usb_put_dev(sc
->dev
);
2264 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
)
2268 struct gendisk
*disk
;
2272 if ((lun
= kzalloc(sizeof(struct ub_lun
), GFP_KERNEL
)) == NULL
)
2277 if ((lun
->id
= ub_id_get()) == -1)
2282 snprintf(lun
->name
, 16, DRV_NAME
"%c(%d.%d.%d)",
2283 lun
->id
+ 'a', sc
->dev
->bus
->busnum
, sc
->dev
->devnum
, lun
->num
);
2285 lun
->removable
= 1; /* XXX Query this from the device */
2286 lun
->changed
= 1; /* ub_revalidate clears only */
2287 ub_revalidate(sc
, lun
);
2290 if ((disk
= alloc_disk(UB_PARTS_PER_LUN
)) == NULL
)
2293 sprintf(disk
->disk_name
, DRV_NAME
"%c", lun
->id
+ 'a');
2294 sprintf(disk
->devfs_name
, DEVFS_NAME
"/%c", lun
->id
+ 'a');
2295 disk
->major
= UB_MAJOR
;
2296 disk
->first_minor
= lun
->id
* UB_PARTS_PER_LUN
;
2297 disk
->fops
= &ub_bd_fops
;
2298 disk
->private_data
= lun
;
2299 disk
->driverfs_dev
= &sc
->intf
->dev
;
2302 if ((q
= blk_init_queue(ub_request_fn
, sc
->lock
)) == NULL
)
2307 blk_queue_bounce_limit(q
, BLK_BOUNCE_HIGH
);
2308 blk_queue_max_hw_segments(q
, UB_MAX_REQ_SG
);
2309 blk_queue_max_phys_segments(q
, UB_MAX_REQ_SG
);
2310 blk_queue_segment_boundary(q
, 0xffffffff); /* Dubious. */
2311 blk_queue_max_sectors(q
, UB_MAX_SECTORS
);
2312 blk_queue_hardsect_size(q
, lun
->capacity
.bsize
);
2316 list_add(&lun
->link
, &sc
->luns
);
2318 set_capacity(disk
, lun
->capacity
.nsec
);
2320 disk
->flags
|= GENHD_FL_REMOVABLE
;
2336 static void ub_disconnect(struct usb_interface
*intf
)
2338 struct ub_dev
*sc
= usb_get_intfdata(intf
);
2339 struct list_head
*p
;
2341 unsigned long flags
;
2344 * Prevent ub_bd_release from pulling the rug from under us.
2345 * XXX This is starting to look like a kref.
2346 * XXX Why not to take this ref at probe time?
2348 spin_lock_irqsave(&ub_lock
, flags
);
2350 spin_unlock_irqrestore(&ub_lock
, flags
);
2353 * Fence stall clearnings, operations triggered by unlinkings and so on.
2354 * We do not attempt to unlink any URBs, because we do not trust the
2355 * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway.
2357 atomic_set(&sc
->poison
, 1);
2360 * Wait for reset to end, if any.
2362 wait_event(sc
->reset_wait
, !sc
->reset
);
2365 * Blow away queued commands.
2367 * Actually, this never works, because before we get here
2368 * the HCD terminates outstanding URB(s). It causes our
2369 * SCSI command queue to advance, commands fail to submit,
2370 * and the whole queue drains. So, we just use this code to
2373 spin_lock_irqsave(sc
->lock
, flags
);
2375 struct ub_scsi_cmd
*cmd
;
2377 while ((cmd
= ub_cmdq_peek(sc
)) != NULL
) {
2378 cmd
->error
= -ENOTCONN
;
2379 cmd
->state
= UB_CMDST_DONE
;
2381 (*cmd
->done
)(sc
, cmd
);
2385 printk(KERN_WARNING
"%s: "
2386 "%d was queued after shutdown\n", sc
->name
, cnt
);
2389 spin_unlock_irqrestore(sc
->lock
, flags
);
2392 * Unregister the upper layer.
2394 list_for_each (p
, &sc
->luns
) {
2395 lun
= list_entry(p
, struct ub_lun
, link
);
2396 del_gendisk(lun
->disk
);
2398 * I wish I could do:
2399 * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags);
2400 * As it is, we rely on our internal poisoning and let
2401 * the upper levels to spin furiously failing all the I/O.
2406 * Testing for -EINPROGRESS is always a bug, so we are bending
2407 * the rules a little.
2409 spin_lock_irqsave(sc
->lock
, flags
);
2410 if (sc
->work_urb
.status
== -EINPROGRESS
) { /* janitors: ignore */
2411 printk(KERN_WARNING
"%s: "
2412 "URB is active after disconnect\n", sc
->name
);
2414 spin_unlock_irqrestore(sc
->lock
, flags
);
2417 * There is virtually no chance that other CPU runs times so long
2418 * after ub_urb_complete should have called del_timer, but only if HCD
2419 * didn't forget to deliver a callback on unlink.
2421 del_timer_sync(&sc
->work_timer
);
2424 * At this point there must be no commands coming from anyone
2425 * and no URBs left in transit.
2431 static struct usb_driver ub_driver
= {
2434 .disconnect
= ub_disconnect
,
2435 .id_table
= ub_usb_ids
,
2438 static int __init
ub_init(void)
2443 for (i
= 0; i
< UB_QLOCK_NUM
; i
++)
2444 spin_lock_init(&ub_qlockv
[i
]);
2446 if ((rc
= register_blkdev(UB_MAJOR
, DRV_NAME
)) != 0)
2448 devfs_mk_dir(DEVFS_NAME
);
2450 if ((rc
= usb_register(&ub_driver
)) != 0)
2453 usb_usual_set_present(USB_US_TYPE_UB
);
2457 devfs_remove(DEVFS_NAME
);
2458 unregister_blkdev(UB_MAJOR
, DRV_NAME
);
2463 static void __exit
ub_exit(void)
2465 usb_deregister(&ub_driver
);
2467 devfs_remove(DEVFS_NAME
);
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");