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