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ide-floppy: use drive->capacity64 for caching current capacity
[linux-2.6-omap-h63xx.git] / drivers / ide / ide-floppy.c
1 /*
2  * IDE ATAPI floppy driver.
3  *
4  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
5  * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
6  * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
7  *
8  * This driver supports the following IDE floppy drives:
9  *
10  * LS-120/240 SuperDisk
11  * Iomega Zip 100/250
12  * Iomega PC Card Clik!/PocketZip
13  *
14  * For a historical changelog see
15  * Documentation/ide/ChangeLog.ide-floppy.1996-2002
16  */
17
18 #define DRV_NAME "ide-floppy"
19 #define PFX DRV_NAME ": "
20
21 #define IDEFLOPPY_VERSION "1.00"
22
23 #include <linux/module.h>
24 #include <linux/types.h>
25 #include <linux/string.h>
26 #include <linux/kernel.h>
27 #include <linux/delay.h>
28 #include <linux/timer.h>
29 #include <linux/mm.h>
30 #include <linux/interrupt.h>
31 #include <linux/major.h>
32 #include <linux/errno.h>
33 #include <linux/genhd.h>
34 #include <linux/slab.h>
35 #include <linux/cdrom.h>
36 #include <linux/ide.h>
37 #include <linux/hdreg.h>
38 #include <linux/bitops.h>
39 #include <linux/mutex.h>
40 #include <linux/scatterlist.h>
41
42 #include <scsi/scsi_ioctl.h>
43
44 #include <asm/byteorder.h>
45 #include <linux/irq.h>
46 #include <linux/uaccess.h>
47 #include <linux/io.h>
48 #include <asm/unaligned.h>
49
50 #include "ide-floppy.h"
51
52 /* module parameters */
53 static unsigned long debug_mask;
54 module_param(debug_mask, ulong, 0644);
55
56 /* define to see debug info */
57 #define IDEFLOPPY_DEBUG_LOG     0
58
59 #if IDEFLOPPY_DEBUG_LOG
60 #define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, args)
61 #else
62 #define ide_debug_log(lvl, fmt, args...) do {} while (0)
63 #endif
64
65 /*
66  * After each failed packet command we issue a request sense command and retry
67  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
68  */
69 #define IDEFLOPPY_MAX_PC_RETRIES        3
70
71 /* format capacities descriptor codes */
72 #define CAPACITY_INVALID        0x00
73 #define CAPACITY_UNFORMATTED    0x01
74 #define CAPACITY_CURRENT        0x02
75 #define CAPACITY_NO_CARTRIDGE   0x03
76
77 /*
78  * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
79  * was apparently being deasserted before the unit was ready to receive data.
80  */
81 #define IDEFLOPPY_PC_DELAY      (HZ/20) /* default delay for ZIP 100 (50ms) */
82
83 /* Error code returned in rq->errors to the higher part of the driver. */
84 #define IDEFLOPPY_ERROR_GENERAL         101
85
86 static DEFINE_MUTEX(idefloppy_ref_mutex);
87
88 static void idefloppy_cleanup_obj(struct kref *);
89
90 static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
91 {
92         struct ide_floppy_obj *floppy = NULL;
93
94         mutex_lock(&idefloppy_ref_mutex);
95         floppy = ide_drv_g(disk, ide_floppy_obj);
96         if (floppy) {
97                 if (ide_device_get(floppy->drive))
98                         floppy = NULL;
99                 else
100                         kref_get(&floppy->kref);
101         }
102         mutex_unlock(&idefloppy_ref_mutex);
103         return floppy;
104 }
105
106 static void ide_floppy_put(struct ide_floppy_obj *floppy)
107 {
108         ide_drive_t *drive = floppy->drive;
109
110         mutex_lock(&idefloppy_ref_mutex);
111         kref_put(&floppy->kref, idefloppy_cleanup_obj);
112         ide_device_put(drive);
113         mutex_unlock(&idefloppy_ref_mutex);
114 }
115
116 /*
117  * Used to finish servicing a request. For read/write requests, we will call
118  * ide_end_request to pass to the next buffer.
119  */
120 static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
121 {
122         idefloppy_floppy_t *floppy = drive->driver_data;
123         struct request *rq = HWGROUP(drive)->rq;
124         int error;
125
126         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
127
128         switch (uptodate) {
129         case 0:
130                 error = IDEFLOPPY_ERROR_GENERAL;
131                 break;
132
133         case 1:
134                 error = 0;
135                 break;
136
137         default:
138                 error = uptodate;
139         }
140
141         if (error)
142                 floppy->failed_pc = NULL;
143         /* Why does this happen? */
144         if (!rq)
145                 return 0;
146         if (!blk_special_request(rq)) {
147                 /* our real local end request function */
148                 ide_end_request(drive, uptodate, nsecs);
149                 return 0;
150         }
151         rq->errors = error;
152         /* fixme: need to move this local also */
153         ide_end_drive_cmd(drive, 0, 0);
154         return 0;
155 }
156
157 static void idefloppy_update_buffers(ide_drive_t *drive,
158                                 struct ide_atapi_pc *pc)
159 {
160         struct request *rq = pc->rq;
161         struct bio *bio = rq->bio;
162
163         while ((bio = rq->bio) != NULL)
164                 idefloppy_end_request(drive, 1, 0);
165 }
166
167 static void ide_floppy_callback(ide_drive_t *drive, int dsc)
168 {
169         idefloppy_floppy_t *floppy = drive->driver_data;
170         struct ide_atapi_pc *pc = drive->pc;
171         int uptodate = pc->error ? 0 : 1;
172
173         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
174
175         if (floppy->failed_pc == pc)
176                 floppy->failed_pc = NULL;
177
178         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
179             (pc->rq && blk_pc_request(pc->rq)))
180                 uptodate = 1; /* FIXME */
181         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
182                 u8 *buf = pc->buf;
183
184                 if (!pc->error) {
185                         floppy->sense_key = buf[2] & 0x0F;
186                         floppy->asc = buf[12];
187                         floppy->ascq = buf[13];
188                         floppy->progress_indication = buf[15] & 0x80 ?
189                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
190
191                         if (floppy->failed_pc)
192                                 ide_debug_log(IDE_DBG_PC, "pc = %x, ",
193                                               floppy->failed_pc->c[0]);
194
195                         ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
196                                       "ascq = %x\n", floppy->sense_key,
197                                       floppy->asc, floppy->ascq);
198                 } else
199                         printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
200                                "Aborting request!\n");
201         }
202
203         idefloppy_end_request(drive, uptodate, 0);
204 }
205
206 static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
207                                     struct ide_atapi_pc *pc)
208 {
209         /* supress error messages resulting from Medium not present */
210         if (floppy->sense_key == 0x02 &&
211             floppy->asc       == 0x3a &&
212             floppy->ascq      == 0x00)
213                 return;
214
215         printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
216                         "asc = %2x, ascq = %2x\n",
217                         floppy->drive->name, pc->c[0], floppy->sense_key,
218                         floppy->asc, floppy->ascq);
219
220 }
221
222 static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
223                 struct ide_atapi_pc *pc)
224 {
225         idefloppy_floppy_t *floppy = drive->driver_data;
226
227         if (floppy->failed_pc == NULL &&
228             pc->c[0] != GPCMD_REQUEST_SENSE)
229                 floppy->failed_pc = pc;
230
231         /* Set the current packet command */
232         drive->pc = pc;
233
234         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
235                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
236                         ide_floppy_report_error(floppy, pc);
237                 /* Giving up */
238                 pc->error = IDEFLOPPY_ERROR_GENERAL;
239
240                 floppy->failed_pc = NULL;
241                 drive->pc_callback(drive, 0);
242                 return ide_stopped;
243         }
244
245         ide_debug_log(IDE_DBG_FUNC, "%s: Retry #%d\n", __func__, pc->retries);
246
247         pc->retries++;
248
249         return ide_issue_pc(drive, WAIT_FLOPPY_CMD, NULL);
250 }
251
252 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
253 {
254         ide_init_pc(pc);
255         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
256         pc->c[7] = 255;
257         pc->c[8] = 255;
258         pc->req_xfer = 255;
259 }
260
261 /* A mode sense command is used to "sense" floppy parameters. */
262 void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
263 {
264         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
265
266         ide_init_pc(pc);
267         pc->c[0] = GPCMD_MODE_SENSE_10;
268         pc->c[1] = 0;
269         pc->c[2] = page_code;
270
271         switch (page_code) {
272         case IDEFLOPPY_CAPABILITIES_PAGE:
273                 length += 12;
274                 break;
275         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
276                 length += 32;
277                 break;
278         default:
279                 printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
280         }
281         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
282         pc->req_xfer = length;
283 }
284
285 static void idefloppy_create_rw_cmd(ide_drive_t *drive,
286                                     struct ide_atapi_pc *pc, struct request *rq,
287                                     unsigned long sector)
288 {
289         idefloppy_floppy_t *floppy = drive->driver_data;
290         int block = sector / floppy->bs_factor;
291         int blocks = rq->nr_sectors / floppy->bs_factor;
292         int cmd = rq_data_dir(rq);
293
294         ide_debug_log(IDE_DBG_FUNC, "%s: block: %d, blocks: %d\n", __func__,
295                       block, blocks);
296
297         ide_init_pc(pc);
298         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
299         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
300         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
301
302         memcpy(rq->cmd, pc->c, 12);
303
304         pc->rq = rq;
305         pc->b_count = 0;
306         if (rq->cmd_flags & REQ_RW)
307                 pc->flags |= PC_FLAG_WRITING;
308         pc->buf = NULL;
309         pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
310         pc->flags |= PC_FLAG_DMA_OK;
311 }
312
313 static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
314                 struct ide_atapi_pc *pc, struct request *rq)
315 {
316         ide_init_pc(pc);
317         memcpy(pc->c, rq->cmd, sizeof(pc->c));
318         pc->rq = rq;
319         pc->b_count = 0;
320         if (rq->data_len && rq_data_dir(rq) == WRITE)
321                 pc->flags |= PC_FLAG_WRITING;
322         pc->buf = rq->data;
323         if (rq->bio)
324                 pc->flags |= PC_FLAG_DMA_OK;
325         /*
326          * possibly problematic, doesn't look like ide-floppy correctly
327          * handled scattered requests if dma fails...
328          */
329         pc->req_xfer = pc->buf_size = rq->data_len;
330 }
331
332 static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
333                 struct request *rq, sector_t block_s)
334 {
335         idefloppy_floppy_t *floppy = drive->driver_data;
336         ide_hwif_t *hwif = drive->hwif;
337         struct ide_atapi_pc *pc;
338         unsigned long block = (unsigned long)block_s;
339
340         ide_debug_log(IDE_DBG_FUNC, "%s: dev: %s, cmd: 0x%x, cmd_type: %x, "
341                       "errors: %d\n",
342                       __func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
343                       rq->cmd[0], rq->cmd_type, rq->errors);
344
345         ide_debug_log(IDE_DBG_FUNC, "%s: sector: %ld, nr_sectors: %ld, "
346                       "current_nr_sectors: %d\n",
347                       __func__, (long)rq->sector, rq->nr_sectors,
348                       rq->current_nr_sectors);
349
350         if (rq->errors >= ERROR_MAX) {
351                 if (floppy->failed_pc)
352                         ide_floppy_report_error(floppy, floppy->failed_pc);
353                 else
354                         printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
355
356                 idefloppy_end_request(drive, 0, 0);
357                 return ide_stopped;
358         }
359         if (blk_fs_request(rq)) {
360                 if (((long)rq->sector % floppy->bs_factor) ||
361                     (rq->nr_sectors % floppy->bs_factor)) {
362                         printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
363                                 drive->name);
364                         idefloppy_end_request(drive, 0, 0);
365                         return ide_stopped;
366                 }
367                 pc = &floppy->queued_pc;
368                 idefloppy_create_rw_cmd(drive, pc, rq, block);
369         } else if (blk_special_request(rq)) {
370                 pc = (struct ide_atapi_pc *) rq->buffer;
371         } else if (blk_pc_request(rq)) {
372                 pc = &floppy->queued_pc;
373                 idefloppy_blockpc_cmd(floppy, pc, rq);
374         } else {
375                 blk_dump_rq_flags(rq, PFX "unsupported command in queue");
376                 idefloppy_end_request(drive, 0, 0);
377                 return ide_stopped;
378         }
379
380         ide_init_sg_cmd(drive, rq);
381         ide_map_sg(drive, rq);
382
383         pc->sg = hwif->sg_table;
384         pc->sg_cnt = hwif->sg_nents;
385
386         pc->rq = rq;
387
388         return idefloppy_issue_pc(drive, pc);
389 }
390
391 /*
392  * Look at the flexible disk page parameters. We ignore the CHS capacity
393  * parameters and use the LBA parameters instead.
394  */
395 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
396 {
397         idefloppy_floppy_t *floppy = drive->driver_data;
398         struct gendisk *disk = floppy->disk;
399         struct ide_atapi_pc pc;
400         u8 *page;
401         int capacity, lba_capacity;
402         u16 transfer_rate, sector_size, cyls, rpm;
403         u8 heads, sectors;
404
405         ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
406
407         if (ide_queue_pc_tail(drive, disk, &pc)) {
408                 printk(KERN_ERR PFX "Can't get flexible disk page params\n");
409                 return 1;
410         }
411
412         if (pc.buf[3] & 0x80)
413                 drive->atapi_flags |= IDE_AFLAG_WP;
414         else
415                 drive->atapi_flags &= ~IDE_AFLAG_WP;
416
417         set_disk_ro(disk, !!(drive->atapi_flags & IDE_AFLAG_WP));
418
419         page = &pc.buf[8];
420
421         transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
422         sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
423         cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
424         rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
425         heads         = pc.buf[8 + 4];
426         sectors       = pc.buf[8 + 5];
427
428         capacity = cyls * heads * sectors * sector_size;
429
430         if (memcmp(page, &floppy->flexible_disk_page, 32))
431                 printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
432                                 "%d sector size, %d rpm\n",
433                                 drive->name, capacity / 1024, cyls, heads,
434                                 sectors, transfer_rate / 8, sector_size, rpm);
435
436         memcpy(&floppy->flexible_disk_page, page, 32);
437         drive->bios_cyl = cyls;
438         drive->bios_head = heads;
439         drive->bios_sect = sectors;
440         lba_capacity = floppy->blocks * floppy->block_size;
441
442         if (capacity < lba_capacity) {
443                 printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
444                         "bytes, but the drive only handles %d\n",
445                         drive->name, lba_capacity, capacity);
446                 floppy->blocks = floppy->block_size ?
447                         capacity / floppy->block_size : 0;
448                 drive->capacity64 = floppy->blocks * floppy->bs_factor;
449         }
450
451         return 0;
452 }
453
454 /*
455  * Determine if a media is present in the floppy drive, and if so, its LBA
456  * capacity.
457  */
458 static int ide_floppy_get_capacity(ide_drive_t *drive)
459 {
460         idefloppy_floppy_t *floppy = drive->driver_data;
461         struct gendisk *disk = floppy->disk;
462         struct ide_atapi_pc pc;
463         u8 *cap_desc;
464         u8 header_len, desc_cnt;
465         int i, rc = 1, blocks, length;
466
467         drive->bios_cyl = 0;
468         drive->bios_head = drive->bios_sect = 0;
469         floppy->blocks = 0;
470         floppy->bs_factor = 1;
471         drive->capacity64 = 0;
472
473         ide_floppy_create_read_capacity_cmd(&pc);
474         if (ide_queue_pc_tail(drive, disk, &pc)) {
475                 printk(KERN_ERR PFX "Can't get floppy parameters\n");
476                 return 1;
477         }
478         header_len = pc.buf[3];
479         cap_desc = &pc.buf[4];
480         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
481
482         for (i = 0; i < desc_cnt; i++) {
483                 unsigned int desc_start = 4 + i*8;
484
485                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
486                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
487
488                 ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
489                               "%d sector size\n",
490                               i, blocks * length / 1024, blocks, length);
491
492                 if (i)
493                         continue;
494                 /*
495                  * the code below is valid only for the 1st descriptor, ie i=0
496                  */
497
498                 switch (pc.buf[desc_start + 4] & 0x03) {
499                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
500                 case CAPACITY_UNFORMATTED:
501                         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
502                                 /*
503                                  * If it is not a clik drive, break out
504                                  * (maintains previous driver behaviour)
505                                  */
506                                 break;
507                 case CAPACITY_CURRENT:
508                         /* Normal Zip/LS-120 disks */
509                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
510                                 printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
511                                        "sector size\n",
512                                        drive->name, blocks * length / 1024,
513                                        blocks, length);
514                         memcpy(&floppy->cap_desc, cap_desc, 8);
515
516                         if (!length || length % 512) {
517                                 printk(KERN_NOTICE PFX "%s: %d bytes block size"
518                                        " not supported\n", drive->name, length);
519                         } else {
520                                 floppy->blocks = blocks;
521                                 floppy->block_size = length;
522                                 floppy->bs_factor = length / 512;
523                                 if (floppy->bs_factor != 1)
524                                         printk(KERN_NOTICE PFX "%s: Warning: "
525                                                "non 512 bytes block size not "
526                                                "fully supported\n",
527                                                drive->name);
528                                 drive->capacity64 =
529                                         floppy->blocks * floppy->bs_factor;
530                                 rc = 0;
531                         }
532                         break;
533                 case CAPACITY_NO_CARTRIDGE:
534                         /*
535                          * This is a KERN_ERR so it appears on screen
536                          * for the user to see
537                          */
538                         printk(KERN_ERR PFX "%s: No disk in drive\n",
539                                drive->name);
540                         break;
541                 case CAPACITY_INVALID:
542                         printk(KERN_ERR PFX "%s: Invalid capacity for disk "
543                                 "in drive\n", drive->name);
544                         break;
545                 }
546                 ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d\n",
547                               pc.buf[desc_start + 4] & 0x03);
548         }
549
550         /* Clik! disk does not support get_flexible_disk_page */
551         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
552                 (void) ide_floppy_get_flexible_disk_page(drive);
553
554         return rc;
555 }
556
557 sector_t ide_floppy_capacity(ide_drive_t *drive)
558 {
559         return drive->capacity64;
560 }
561
562 static void idefloppy_setup(ide_drive_t *drive)
563 {
564         struct ide_floppy_obj *floppy = drive->driver_data;
565         u16 *id = drive->id;
566
567         drive->pc_callback       = ide_floppy_callback;
568         drive->pc_update_buffers = idefloppy_update_buffers;
569         drive->pc_io_buffers     = ide_io_buffers;
570
571         /*
572          * We used to check revisions here. At this point however I'm giving up.
573          * Just assume they are all broken, its easier.
574          *
575          * The actual reason for the workarounds was likely a driver bug after
576          * all rather than a firmware bug, and the workaround below used to hide
577          * it. It should be fixed as of version 1.9, but to be on the safe side
578          * we'll leave the limitation below for the 2.2.x tree.
579          */
580         if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
581                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
582                 /* This value will be visible in the /proc/ide/hdx/settings */
583                 drive->pc_delay = IDEFLOPPY_PC_DELAY;
584                 blk_queue_max_sectors(drive->queue, 64);
585         }
586
587         /*
588          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
589          * nasty clicking noises without it, so please don't remove this.
590          */
591         if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
592                 blk_queue_max_sectors(drive->queue, 64);
593                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
594                 /* IOMEGA Clik! drives do not support lock/unlock commands */
595                 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
596         }
597
598         (void) ide_floppy_get_capacity(drive);
599
600         ide_proc_register_driver(drive, floppy->driver);
601
602         drive->dev_flags |= IDE_DFLAG_ATTACH;
603 }
604
605 static void ide_floppy_remove(ide_drive_t *drive)
606 {
607         idefloppy_floppy_t *floppy = drive->driver_data;
608         struct gendisk *g = floppy->disk;
609
610         ide_proc_unregister_driver(drive, floppy->driver);
611
612         del_gendisk(g);
613
614         ide_floppy_put(floppy);
615 }
616
617 static void idefloppy_cleanup_obj(struct kref *kref)
618 {
619         struct ide_floppy_obj *floppy = to_ide_drv(kref, ide_floppy_obj);
620         ide_drive_t *drive = floppy->drive;
621         struct gendisk *g = floppy->disk;
622
623         drive->driver_data = NULL;
624         g->private_data = NULL;
625         put_disk(g);
626         kfree(floppy);
627 }
628
629 static int ide_floppy_probe(ide_drive_t *);
630
631 static ide_driver_t idefloppy_driver = {
632         .gen_driver = {
633                 .owner          = THIS_MODULE,
634                 .name           = "ide-floppy",
635                 .bus            = &ide_bus_type,
636         },
637         .probe                  = ide_floppy_probe,
638         .remove                 = ide_floppy_remove,
639         .version                = IDEFLOPPY_VERSION,
640         .do_request             = idefloppy_do_request,
641         .end_request            = idefloppy_end_request,
642         .error                  = __ide_error,
643 #ifdef CONFIG_IDE_PROC_FS
644         .proc                   = ide_floppy_proc,
645         .settings               = ide_floppy_settings,
646 #endif
647 };
648
649 static int idefloppy_open(struct inode *inode, struct file *filp)
650 {
651         struct gendisk *disk = inode->i_bdev->bd_disk;
652         struct ide_floppy_obj *floppy;
653         ide_drive_t *drive;
654         int ret = 0;
655
656         floppy = ide_floppy_get(disk);
657         if (!floppy)
658                 return -ENXIO;
659
660         drive = floppy->drive;
661
662         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
663
664         floppy->openers++;
665
666         if (floppy->openers == 1) {
667                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
668                 /* Just in case */
669
670                 if (ide_do_test_unit_ready(drive, disk))
671                         ide_do_start_stop(drive, disk, 1);
672
673                 ret = ide_floppy_get_capacity(drive);
674
675                 set_capacity(disk, ide_floppy_capacity(drive));
676
677                 if (ret && (filp->f_flags & O_NDELAY) == 0) {
678                     /*
679                      * Allow O_NDELAY to open a drive without a disk, or with an
680                      * unreadable disk, so that we can get the format capacity
681                      * of the drive or begin the format - Sam
682                      */
683                         ret = -EIO;
684                         goto out_put_floppy;
685                 }
686
687                 if ((drive->atapi_flags & IDE_AFLAG_WP) && (filp->f_mode & 2)) {
688                         ret = -EROFS;
689                         goto out_put_floppy;
690                 }
691
692                 drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
693                 ide_set_media_lock(drive, disk, 1);
694                 check_disk_change(inode->i_bdev);
695         } else if (drive->atapi_flags & IDE_AFLAG_FORMAT_IN_PROGRESS) {
696                 ret = -EBUSY;
697                 goto out_put_floppy;
698         }
699         return 0;
700
701 out_put_floppy:
702         floppy->openers--;
703         ide_floppy_put(floppy);
704         return ret;
705 }
706
707 static int idefloppy_release(struct inode *inode, struct file *filp)
708 {
709         struct gendisk *disk = inode->i_bdev->bd_disk;
710         struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
711         ide_drive_t *drive = floppy->drive;
712
713         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
714
715         if (floppy->openers == 1) {
716                 ide_set_media_lock(drive, disk, 0);
717                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
718         }
719
720         floppy->openers--;
721
722         ide_floppy_put(floppy);
723
724         return 0;
725 }
726
727 static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
728 {
729         struct ide_floppy_obj *floppy = ide_drv_g(bdev->bd_disk,
730                                                      ide_floppy_obj);
731         ide_drive_t *drive = floppy->drive;
732
733         geo->heads = drive->bios_head;
734         geo->sectors = drive->bios_sect;
735         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
736         return 0;
737 }
738
739 static int idefloppy_media_changed(struct gendisk *disk)
740 {
741         struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
742         ide_drive_t *drive = floppy->drive;
743         int ret;
744
745         /* do not scan partitions twice if this is a removable device */
746         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
747                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
748                 return 0;
749         }
750         ret = !!(drive->atapi_flags & IDE_AFLAG_MEDIA_CHANGED);
751         drive->atapi_flags &= ~IDE_AFLAG_MEDIA_CHANGED;
752         return ret;
753 }
754
755 static int idefloppy_revalidate_disk(struct gendisk *disk)
756 {
757         struct ide_floppy_obj *floppy = ide_drv_g(disk, ide_floppy_obj);
758         set_capacity(disk, ide_floppy_capacity(floppy->drive));
759         return 0;
760 }
761
762 static struct block_device_operations idefloppy_ops = {
763         .owner                  = THIS_MODULE,
764         .open                   = idefloppy_open,
765         .release                = idefloppy_release,
766         .ioctl                  = ide_floppy_ioctl,
767         .getgeo                 = idefloppy_getgeo,
768         .media_changed          = idefloppy_media_changed,
769         .revalidate_disk        = idefloppy_revalidate_disk
770 };
771
772 static int ide_floppy_probe(ide_drive_t *drive)
773 {
774         idefloppy_floppy_t *floppy;
775         struct gendisk *g;
776
777         if (!strstr("ide-floppy", drive->driver_req))
778                 goto failed;
779
780         if (drive->media != ide_floppy)
781                 goto failed;
782
783         if (!ide_check_atapi_device(drive, DRV_NAME)) {
784                 printk(KERN_ERR PFX "%s: not supported by this version of "
785                        DRV_NAME "\n", drive->name);
786                 goto failed;
787         }
788         floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
789         if (!floppy) {
790                 printk(KERN_ERR PFX "%s: Can't allocate a floppy structure\n",
791                        drive->name);
792                 goto failed;
793         }
794
795         g = alloc_disk_node(1 << PARTN_BITS, hwif_to_node(drive->hwif));
796         if (!g)
797                 goto out_free_floppy;
798
799         ide_init_disk(g, drive);
800
801         kref_init(&floppy->kref);
802
803         floppy->drive = drive;
804         floppy->driver = &idefloppy_driver;
805         floppy->disk = g;
806
807         g->private_data = &floppy->driver;
808
809         drive->driver_data = floppy;
810
811         drive->debug_mask = debug_mask;
812
813         idefloppy_setup(drive);
814
815         set_capacity(g, ide_floppy_capacity(drive));
816
817         g->minors = 1 << PARTN_BITS;
818         g->driverfs_dev = &drive->gendev;
819         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
820                 g->flags = GENHD_FL_REMOVABLE;
821         g->fops = &idefloppy_ops;
822         add_disk(g);
823         return 0;
824
825 out_free_floppy:
826         kfree(floppy);
827 failed:
828         return -ENODEV;
829 }
830
831 static void __exit idefloppy_exit(void)
832 {
833         driver_unregister(&idefloppy_driver.gen_driver);
834 }
835
836 static int __init idefloppy_init(void)
837 {
838         printk(KERN_INFO DRV_NAME " driver " IDEFLOPPY_VERSION "\n");
839         return driver_register(&idefloppy_driver.gen_driver);
840 }
841
842 MODULE_ALIAS("ide:*m-floppy*");
843 MODULE_ALIAS("ide-floppy");
844 module_init(idefloppy_init);
845 module_exit(idefloppy_exit);
846 MODULE_LICENSE("GPL");
847 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
848