Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-2.6.git] / drivers / ide / ide-proc.c
1 /*
2  *  Copyright (C) 1997-1998     Mark Lord
3  *  Copyright (C) 2003          Red Hat
4  *
5  *  Some code was moved here from ide.c, see it for original copyrights.
6  */
7
8 /*
9  * This is the /proc/ide/ filesystem implementation.
10  *
11  * Drive/Driver settings can be retrieved by reading the drive's
12  * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
13  * To write a new value "val" into a specific setting "name", use:
14  *   echo "name:val" >/proc/ide/ide0/hda/settings
15  */
16
17 #include <linux/module.h>
18
19 #include <asm/uaccess.h>
20 #include <linux/errno.h>
21 #include <linux/proc_fs.h>
22 #include <linux/stat.h>
23 #include <linux/mm.h>
24 #include <linux/pci.h>
25 #include <linux/ctype.h>
26 #include <linux/ide.h>
27 #include <linux/seq_file.h>
28
29 #include <asm/io.h>
30
31 static struct proc_dir_entry *proc_ide_root;
32
33 static int ide_imodel_proc_show(struct seq_file *m, void *v)
34 {
35         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
36         const char      *name;
37
38         switch (hwif->chipset) {
39         case ide_generic:       name = "generic";       break;
40         case ide_pci:           name = "pci";           break;
41         case ide_cmd640:        name = "cmd640";        break;
42         case ide_dtc2278:       name = "dtc2278";       break;
43         case ide_ali14xx:       name = "ali14xx";       break;
44         case ide_qd65xx:        name = "qd65xx";        break;
45         case ide_umc8672:       name = "umc8672";       break;
46         case ide_ht6560b:       name = "ht6560b";       break;
47         case ide_4drives:       name = "4drives";       break;
48         case ide_pmac:          name = "mac-io";        break;
49         case ide_au1xxx:        name = "au1xxx";        break;
50         case ide_palm3710:      name = "palm3710";      break;
51         case ide_acorn:         name = "acorn";         break;
52         default:                name = "(unknown)";     break;
53         }
54         seq_printf(m, "%s\n", name);
55         return 0;
56 }
57
58 static int ide_imodel_proc_open(struct inode *inode, struct file *file)
59 {
60         return single_open(file, ide_imodel_proc_show, PDE(inode)->data);
61 }
62
63 static const struct file_operations ide_imodel_proc_fops = {
64         .owner          = THIS_MODULE,
65         .open           = ide_imodel_proc_open,
66         .read           = seq_read,
67         .llseek         = seq_lseek,
68         .release        = single_release,
69 };
70
71 static int ide_mate_proc_show(struct seq_file *m, void *v)
72 {
73         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
74
75         if (hwif && hwif->mate)
76                 seq_printf(m, "%s\n", hwif->mate->name);
77         else
78                 seq_printf(m, "(none)\n");
79         return 0;
80 }
81
82 static int ide_mate_proc_open(struct inode *inode, struct file *file)
83 {
84         return single_open(file, ide_mate_proc_show, PDE(inode)->data);
85 }
86
87 static const struct file_operations ide_mate_proc_fops = {
88         .owner          = THIS_MODULE,
89         .open           = ide_mate_proc_open,
90         .read           = seq_read,
91         .llseek         = seq_lseek,
92         .release        = single_release,
93 };
94
95 static int ide_channel_proc_show(struct seq_file *m, void *v)
96 {
97         ide_hwif_t      *hwif = (ide_hwif_t *) m->private;
98
99         seq_printf(m, "%c\n", hwif->channel ? '1' : '0');
100         return 0;
101 }
102
103 static int ide_channel_proc_open(struct inode *inode, struct file *file)
104 {
105         return single_open(file, ide_channel_proc_show, PDE(inode)->data);
106 }
107
108 static const struct file_operations ide_channel_proc_fops = {
109         .owner          = THIS_MODULE,
110         .open           = ide_channel_proc_open,
111         .read           = seq_read,
112         .llseek         = seq_lseek,
113         .release        = single_release,
114 };
115
116 static int ide_identify_proc_show(struct seq_file *m, void *v)
117 {
118         ide_drive_t *drive = (ide_drive_t *)m->private;
119         u8 *buf;
120
121         if (!drive) {
122                 seq_putc(m, '\n');
123                 return 0;
124         }
125
126         buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
127         if (!buf)
128                 return -ENOMEM;
129         if (taskfile_lib_get_identify(drive, buf) == 0) {
130                 __le16 *val = (__le16 *)buf;
131                 int i;
132
133                 for (i = 0; i < SECTOR_SIZE / 2; i++) {
134                         seq_printf(m, "%04x%c", le16_to_cpu(val[i]),
135                                         (i % 8) == 7 ? '\n' : ' ');
136                 }
137         } else
138                 seq_putc(m, buf[0]);
139         kfree(buf);
140         return 0;
141 }
142
143 static int ide_identify_proc_open(struct inode *inode, struct file *file)
144 {
145         return single_open(file, ide_identify_proc_show, PDE(inode)->data);
146 }
147
148 static const struct file_operations ide_identify_proc_fops = {
149         .owner          = THIS_MODULE,
150         .open           = ide_identify_proc_open,
151         .read           = seq_read,
152         .llseek         = seq_lseek,
153         .release        = single_release,
154 };
155
156 /**
157  *      ide_find_setting        -       find a specific setting
158  *      @st: setting table pointer
159  *      @name: setting name
160  *
161  *      Scan's the setting table for a matching entry and returns
162  *      this or NULL if no entry is found. The caller must hold the
163  *      setting semaphore
164  */
165
166 static
167 const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
168                                                char *name)
169 {
170         while (st->name) {
171                 if (strcmp(st->name, name) == 0)
172                         break;
173                 st++;
174         }
175         return st->name ? st : NULL;
176 }
177
178 /**
179  *      ide_read_setting        -       read an IDE setting
180  *      @drive: drive to read from
181  *      @setting: drive setting
182  *
183  *      Read a drive setting and return the value. The caller
184  *      must hold the ide_setting_mtx when making this call.
185  *
186  *      BUGS: the data return and error are the same return value
187  *      so an error -EINVAL and true return of the same value cannot
188  *      be told apart
189  */
190
191 static int ide_read_setting(ide_drive_t *drive,
192                             const struct ide_proc_devset *setting)
193 {
194         const struct ide_devset *ds = setting->setting;
195         int val = -EINVAL;
196
197         if (ds->get)
198                 val = ds->get(drive);
199
200         return val;
201 }
202
203 /**
204  *      ide_write_setting       -       read an IDE setting
205  *      @drive: drive to read from
206  *      @setting: drive setting
207  *      @val: value
208  *
209  *      Write a drive setting if it is possible. The caller
210  *      must hold the ide_setting_mtx when making this call.
211  *
212  *      BUGS: the data return and error are the same return value
213  *      so an error -EINVAL and true return of the same value cannot
214  *      be told apart
215  *
216  *      FIXME:  This should be changed to enqueue a special request
217  *      to the driver to change settings, and then wait on a sema for completion.
218  *      The current scheme of polling is kludgy, though safe enough.
219  */
220
221 static int ide_write_setting(ide_drive_t *drive,
222                              const struct ide_proc_devset *setting, int val)
223 {
224         const struct ide_devset *ds = setting->setting;
225
226         if (!capable(CAP_SYS_ADMIN))
227                 return -EACCES;
228         if (!ds->set)
229                 return -EPERM;
230         if ((ds->flags & DS_SYNC)
231             && (val < setting->min || val > setting->max))
232                 return -EINVAL;
233         return ide_devset_execute(drive, ds, val);
234 }
235
236 ide_devset_get(xfer_rate, current_speed);
237
238 static int set_xfer_rate (ide_drive_t *drive, int arg)
239 {
240         struct ide_cmd cmd;
241
242         if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
243                 return -EINVAL;
244
245         memset(&cmd, 0, sizeof(cmd));
246         cmd.tf.command = ATA_CMD_SET_FEATURES;
247         cmd.tf.feature = SETFEATURES_XFER;
248         cmd.tf.nsect   = (u8)arg;
249         cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
250         cmd.valid.in.tf  = IDE_VALID_NSECT;
251         cmd.tf_flags   = IDE_TFLAG_SET_XFER;
252
253         return ide_no_data_taskfile(drive, &cmd);
254 }
255
256 ide_devset_rw(current_speed, xfer_rate);
257 ide_devset_rw_field(init_speed, init_speed);
258 ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
259 ide_devset_rw_field(number, dn);
260
261 static const struct ide_proc_devset ide_generic_settings[] = {
262         IDE_PROC_DEVSET(current_speed, 0, 70),
263         IDE_PROC_DEVSET(init_speed, 0, 70),
264         IDE_PROC_DEVSET(io_32bit,  0, 1 + (SUPPORT_VLB_SYNC << 1)),
265         IDE_PROC_DEVSET(keepsettings, 0, 1),
266         IDE_PROC_DEVSET(nice1, 0, 1),
267         IDE_PROC_DEVSET(number, 0, 3),
268         IDE_PROC_DEVSET(pio_mode, 0, 255),
269         IDE_PROC_DEVSET(unmaskirq, 0, 1),
270         IDE_PROC_DEVSET(using_dma, 0, 1),
271         { NULL },
272 };
273
274 static void proc_ide_settings_warn(void)
275 {
276         static int warned;
277
278         if (warned)
279                 return;
280
281         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
282                             "obsolete, and will be removed soon!\n");
283         warned = 1;
284 }
285
286 static int ide_settings_proc_show(struct seq_file *m, void *v)
287 {
288         const struct ide_proc_devset *setting, *g, *d;
289         const struct ide_devset *ds;
290         ide_drive_t     *drive = (ide_drive_t *) m->private;
291         int             rc, mul_factor, div_factor;
292
293         proc_ide_settings_warn();
294
295         mutex_lock(&ide_setting_mtx);
296         g = ide_generic_settings;
297         d = drive->settings;
298         seq_printf(m, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
299         seq_printf(m, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
300         while (g->name || (d && d->name)) {
301                 /* read settings in the alphabetical order */
302                 if (g->name && d && d->name) {
303                         if (strcmp(d->name, g->name) < 0)
304                                 setting = d++;
305                         else
306                                 setting = g++;
307                 } else if (d && d->name) {
308                         setting = d++;
309                 } else
310                         setting = g++;
311                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
312                 div_factor = setting->divf ? setting->divf(drive) : 1;
313                 seq_printf(m, "%-24s", setting->name);
314                 rc = ide_read_setting(drive, setting);
315                 if (rc >= 0)
316                         seq_printf(m, "%-16d", rc * mul_factor / div_factor);
317                 else
318                         seq_printf(m, "%-16s", "write-only");
319                 seq_printf(m, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
320                 ds = setting->setting;
321                 if (ds->get)
322                         seq_printf(m, "r");
323                 if (ds->set)
324                         seq_printf(m, "w");
325                 seq_printf(m, "\n");
326         }
327         mutex_unlock(&ide_setting_mtx);
328         return 0;
329 }
330
331 static int ide_settings_proc_open(struct inode *inode, struct file *file)
332 {
333         return single_open(file, ide_settings_proc_show, PDE(inode)->data);
334 }
335
336 #define MAX_LEN 30
337
338 static ssize_t ide_settings_proc_write(struct file *file, const char __user *buffer,
339                                        size_t count, loff_t *pos)
340 {
341         ide_drive_t     *drive = (ide_drive_t *) PDE(file->f_path.dentry->d_inode)->data;
342         char            name[MAX_LEN + 1];
343         int             for_real = 0, mul_factor, div_factor;
344         unsigned long   n;
345
346         const struct ide_proc_devset *setting;
347         char *buf, *s;
348
349         if (!capable(CAP_SYS_ADMIN))
350                 return -EACCES;
351
352         proc_ide_settings_warn();
353
354         if (count >= PAGE_SIZE)
355                 return -EINVAL;
356
357         s = buf = (char *)__get_free_page(GFP_USER);
358         if (!buf)
359                 return -ENOMEM;
360
361         if (copy_from_user(buf, buffer, count)) {
362                 free_page((unsigned long)buf);
363                 return -EFAULT;
364         }
365
366         buf[count] = '\0';
367
368         /*
369          * Skip over leading whitespace
370          */
371         while (count && isspace(*s)) {
372                 --count;
373                 ++s;
374         }
375         /*
376          * Do one full pass to verify all parameters,
377          * then do another to actually write the new settings.
378          */
379         do {
380                 char *p = s;
381                 n = count;
382                 while (n > 0) {
383                         unsigned val;
384                         char *q = p;
385
386                         while (n > 0 && *p != ':') {
387                                 --n;
388                                 p++;
389                         }
390                         if (*p != ':')
391                                 goto parse_error;
392                         if (p - q > MAX_LEN)
393                                 goto parse_error;
394                         memcpy(name, q, p - q);
395                         name[p - q] = 0;
396
397                         if (n > 0) {
398                                 --n;
399                                 p++;
400                         } else
401                                 goto parse_error;
402
403                         val = simple_strtoul(p, &q, 10);
404                         n -= q - p;
405                         p = q;
406                         if (n > 0 && !isspace(*p))
407                                 goto parse_error;
408                         while (n > 0 && isspace(*p)) {
409                                 --n;
410                                 ++p;
411                         }
412
413                         mutex_lock(&ide_setting_mtx);
414                         /* generic settings first, then driver specific ones */
415                         setting = ide_find_setting(ide_generic_settings, name);
416                         if (!setting) {
417                                 if (drive->settings)
418                                         setting = ide_find_setting(drive->settings, name);
419                                 if (!setting) {
420                                         mutex_unlock(&ide_setting_mtx);
421                                         goto parse_error;
422                                 }
423                         }
424                         if (for_real) {
425                                 mul_factor = setting->mulf ? setting->mulf(drive) : 1;
426                                 div_factor = setting->divf ? setting->divf(drive) : 1;
427                                 ide_write_setting(drive, setting, val * div_factor / mul_factor);
428                         }
429                         mutex_unlock(&ide_setting_mtx);
430                 }
431         } while (!for_real++);
432         free_page((unsigned long)buf);
433         return count;
434 parse_error:
435         free_page((unsigned long)buf);
436         printk("%s(): parse error\n", __func__);
437         return -EINVAL;
438 }
439
440 static const struct file_operations ide_settings_proc_fops = {
441         .owner          = THIS_MODULE,
442         .open           = ide_settings_proc_open,
443         .read           = seq_read,
444         .llseek         = seq_lseek,
445         .release        = single_release,
446         .write          = ide_settings_proc_write,
447 };
448
449 static int ide_capacity_proc_show(struct seq_file *m, void *v)
450 {
451         seq_printf(m, "%llu\n", (long long)0x7fffffff);
452         return 0;
453 }
454
455 static int ide_capacity_proc_open(struct inode *inode, struct file *file)
456 {
457         return single_open(file, ide_capacity_proc_show, NULL);
458 }
459
460 const struct file_operations ide_capacity_proc_fops = {
461         .owner          = THIS_MODULE,
462         .open           = ide_capacity_proc_open,
463         .read           = seq_read,
464         .llseek         = seq_lseek,
465         .release        = single_release,
466 };
467 EXPORT_SYMBOL_GPL(ide_capacity_proc_fops);
468
469 static int ide_geometry_proc_show(struct seq_file *m, void *v)
470 {
471         ide_drive_t     *drive = (ide_drive_t *) m->private;
472
473         seq_printf(m, "physical     %d/%d/%d\n",
474                         drive->cyl, drive->head, drive->sect);
475         seq_printf(m, "logical      %d/%d/%d\n",
476                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
477         return 0;
478 }
479
480 static int ide_geometry_proc_open(struct inode *inode, struct file *file)
481 {
482         return single_open(file, ide_geometry_proc_show, PDE(inode)->data);
483 }
484
485 const struct file_operations ide_geometry_proc_fops = {
486         .owner          = THIS_MODULE,
487         .open           = ide_geometry_proc_open,
488         .read           = seq_read,
489         .llseek         = seq_lseek,
490         .release        = single_release,
491 };
492 EXPORT_SYMBOL(ide_geometry_proc_fops);
493
494 static int ide_dmodel_proc_show(struct seq_file *seq, void *v)
495 {
496         ide_drive_t     *drive = (ide_drive_t *) seq->private;
497         char            *m = (char *)&drive->id[ATA_ID_PROD];
498
499         seq_printf(seq, "%.40s\n", m[0] ? m : "(none)");
500         return 0;
501 }
502
503 static int ide_dmodel_proc_open(struct inode *inode, struct file *file)
504 {
505         return single_open(file, ide_dmodel_proc_show, PDE(inode)->data);
506 }
507
508 static const struct file_operations ide_dmodel_proc_fops = {
509         .owner          = THIS_MODULE,
510         .open           = ide_dmodel_proc_open,
511         .read           = seq_read,
512         .llseek         = seq_lseek,
513         .release        = single_release,
514 };
515
516 static int ide_driver_proc_show(struct seq_file *m, void *v)
517 {
518         ide_drive_t             *drive = (ide_drive_t *)m->private;
519         struct device           *dev = &drive->gendev;
520         struct ide_driver       *ide_drv;
521
522         if (dev->driver) {
523                 ide_drv = to_ide_driver(dev->driver);
524                 seq_printf(m, "%s version %s\n",
525                                 dev->driver->name, ide_drv->version);
526         } else
527                 seq_printf(m, "ide-default version 0.9.newide\n");
528         return 0;
529 }
530
531 static int ide_driver_proc_open(struct inode *inode, struct file *file)
532 {
533         return single_open(file, ide_driver_proc_show, PDE(inode)->data);
534 }
535
536 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
537 {
538         struct device *dev = &drive->gendev;
539         int ret = 1;
540         int err;
541
542         device_release_driver(dev);
543         /* FIXME: device can still be in use by previous driver */
544         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
545         err = device_attach(dev);
546         if (err < 0)
547                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
548                         __func__, err);
549         drive->driver_req[0] = 0;
550         if (dev->driver == NULL) {
551                 err = device_attach(dev);
552                 if (err < 0)
553                         printk(KERN_WARNING
554                                 "IDE: %s: device_attach(2) error: %d\n",
555                                 __func__, err);
556         }
557         if (dev->driver && !strcmp(dev->driver->name, driver))
558                 ret = 0;
559
560         return ret;
561 }
562
563 static ssize_t ide_driver_proc_write(struct file *file, const char __user *buffer,
564                                      size_t count, loff_t *pos)
565 {
566         ide_drive_t     *drive = (ide_drive_t *) PDE(file->f_path.dentry->d_inode)->data;
567         char name[32];
568
569         if (!capable(CAP_SYS_ADMIN))
570                 return -EACCES;
571         if (count > 31)
572                 count = 31;
573         if (copy_from_user(name, buffer, count))
574                 return -EFAULT;
575         name[count] = '\0';
576         if (ide_replace_subdriver(drive, name))
577                 return -EINVAL;
578         return count;
579 }
580
581 static const struct file_operations ide_driver_proc_fops = {
582         .owner          = THIS_MODULE,
583         .open           = ide_driver_proc_open,
584         .read           = seq_read,
585         .llseek         = seq_lseek,
586         .release        = single_release,
587         .write          = ide_driver_proc_write,
588 };
589
590 static int ide_media_proc_show(struct seq_file *m, void *v)
591 {
592         ide_drive_t     *drive = (ide_drive_t *) m->private;
593         const char      *media;
594
595         switch (drive->media) {
596         case ide_disk:          media = "disk\n";       break;
597         case ide_cdrom:         media = "cdrom\n";      break;
598         case ide_tape:          media = "tape\n";       break;
599         case ide_floppy:        media = "floppy\n";     break;
600         case ide_optical:       media = "optical\n";    break;
601         default:                media = "UNKNOWN\n";    break;
602         }
603         seq_puts(m, media);
604         return 0;
605 }
606
607 static int ide_media_proc_open(struct inode *inode, struct file *file)
608 {
609         return single_open(file, ide_media_proc_show, PDE(inode)->data);
610 }
611
612 static const struct file_operations ide_media_proc_fops = {
613         .owner          = THIS_MODULE,
614         .open           = ide_media_proc_open,
615         .read           = seq_read,
616         .llseek         = seq_lseek,
617         .release        = single_release,
618 };
619
620 static ide_proc_entry_t generic_drive_entries[] = {
621         { "driver",     S_IFREG|S_IRUGO,         &ide_driver_proc_fops  },
622         { "identify",   S_IFREG|S_IRUSR,         &ide_identify_proc_fops},
623         { "media",      S_IFREG|S_IRUGO,         &ide_media_proc_fops   },
624         { "model",      S_IFREG|S_IRUGO,         &ide_dmodel_proc_fops  },
625         { "settings",   S_IFREG|S_IRUSR|S_IWUSR, &ide_settings_proc_fops},
626         {}
627 };
628
629 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
630 {
631         struct proc_dir_entry *ent;
632
633         if (!dir || !p)
634                 return;
635         while (p->name != NULL) {
636                 ent = proc_create_data(p->name, p->mode, dir, p->proc_fops, data);
637                 if (!ent) return;
638                 p++;
639         }
640 }
641
642 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
643 {
644         if (!dir || !p)
645                 return;
646         while (p->name != NULL) {
647                 remove_proc_entry(p->name, dir);
648                 p++;
649         }
650 }
651
652 void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
653 {
654         mutex_lock(&ide_setting_mtx);
655         drive->settings = driver->proc_devsets(drive);
656         mutex_unlock(&ide_setting_mtx);
657
658         ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
659 }
660
661 EXPORT_SYMBOL(ide_proc_register_driver);
662
663 /**
664  *      ide_proc_unregister_driver      -       remove driver specific data
665  *      @drive: drive
666  *      @driver: driver
667  *
668  *      Clean up the driver specific /proc files and IDE settings
669  *      for a given drive.
670  *
671  *      Takes ide_setting_mtx.
672  */
673
674 void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
675 {
676         ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
677
678         mutex_lock(&ide_setting_mtx);
679         /*
680          * ide_setting_mtx protects both the settings list and the use
681          * of settings (we cannot take a setting out that is being used).
682          */
683         drive->settings = NULL;
684         mutex_unlock(&ide_setting_mtx);
685 }
686 EXPORT_SYMBOL(ide_proc_unregister_driver);
687
688 void ide_proc_port_register_devices(ide_hwif_t *hwif)
689 {
690         struct proc_dir_entry *ent;
691         struct proc_dir_entry *parent = hwif->proc;
692         ide_drive_t *drive;
693         char name[64];
694         int i;
695
696         ide_port_for_each_dev(i, drive, hwif) {
697                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
698                         continue;
699
700                 drive->proc = proc_mkdir(drive->name, parent);
701                 if (drive->proc)
702                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
703                 sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
704                 ent = proc_symlink(drive->name, proc_ide_root, name);
705                 if (!ent) return;
706         }
707 }
708
709 void ide_proc_unregister_device(ide_drive_t *drive)
710 {
711         if (drive->proc) {
712                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
713                 remove_proc_entry(drive->name, proc_ide_root);
714                 remove_proc_entry(drive->name, drive->hwif->proc);
715                 drive->proc = NULL;
716         }
717 }
718
719 static ide_proc_entry_t hwif_entries[] = {
720         { "channel",    S_IFREG|S_IRUGO,        &ide_channel_proc_fops  },
721         { "mate",       S_IFREG|S_IRUGO,        &ide_mate_proc_fops     },
722         { "model",      S_IFREG|S_IRUGO,        &ide_imodel_proc_fops   },
723         {}
724 };
725
726 void ide_proc_register_port(ide_hwif_t *hwif)
727 {
728         if (!hwif->proc) {
729                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
730
731                 if (!hwif->proc)
732                         return;
733
734                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
735         }
736 }
737
738 void ide_proc_unregister_port(ide_hwif_t *hwif)
739 {
740         if (hwif->proc) {
741                 ide_remove_proc_entries(hwif->proc, hwif_entries);
742                 remove_proc_entry(hwif->name, proc_ide_root);
743                 hwif->proc = NULL;
744         }
745 }
746
747 static int proc_print_driver(struct device_driver *drv, void *data)
748 {
749         struct ide_driver *ide_drv = to_ide_driver(drv);
750         struct seq_file *s = data;
751
752         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
753
754         return 0;
755 }
756
757 static int ide_drivers_show(struct seq_file *s, void *p)
758 {
759         int err;
760
761         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
762         if (err < 0)
763                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
764                         __func__, err);
765         return 0;
766 }
767
768 static int ide_drivers_open(struct inode *inode, struct file *file)
769 {
770         return single_open(file, &ide_drivers_show, NULL);
771 }
772
773 static const struct file_operations ide_drivers_operations = {
774         .owner          = THIS_MODULE,
775         .open           = ide_drivers_open,
776         .read           = seq_read,
777         .llseek         = seq_lseek,
778         .release        = single_release,
779 };
780
781 void proc_ide_create(void)
782 {
783         proc_ide_root = proc_mkdir("ide", NULL);
784
785         if (!proc_ide_root)
786                 return;
787
788         proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
789 }
790
791 void proc_ide_destroy(void)
792 {
793         remove_proc_entry("drivers", proc_ide_root);
794         remove_proc_entry("ide", NULL);
795 }