ide: use mutex instead of ide_setting_sem semaphore in IDE driver
[linux-2.6] / drivers / ide / ide-proc.c
1 /*
2  *  linux/drivers/ide/ide-proc.c        Version 1.05    Mar 05, 2003
3  *
4  *  Copyright (C) 1997-1998     Mark Lord
5  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
6  *
7  *  Some code was moved here from ide.c, see it for original copyrights.
8  */
9
10 /*
11  * This is the /proc/ide/ filesystem implementation.
12  *
13  * Drive/Driver settings can be retrieved by reading the drive's
14  * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
15  * To write a new value "val" into a specific setting "name", use:
16  *   echo "name:val" >/proc/ide/ide0/hda/settings
17  *
18  * Also useful, "cat /proc/ide0/hda/[identify, smart_values,
19  * smart_thresholds, capabilities]" will issue an IDENTIFY /
20  * PACKET_IDENTIFY / SMART_READ_VALUES / SMART_READ_THRESHOLDS /
21  * SENSE CAPABILITIES command to /dev/hda, and then dump out the
22  * returned data as 256 16-bit words.  The "hdparm" utility will
23  * be updated someday soon to use this mechanism.
24  *
25  */
26
27 #include <linux/module.h>
28
29 #include <asm/uaccess.h>
30 #include <linux/errno.h>
31 #include <linux/proc_fs.h>
32 #include <linux/stat.h>
33 #include <linux/mm.h>
34 #include <linux/pci.h>
35 #include <linux/ctype.h>
36 #include <linux/hdreg.h>
37 #include <linux/ide.h>
38 #include <linux/seq_file.h>
39
40 #include <asm/io.h>
41
42 static struct proc_dir_entry *proc_ide_root;
43
44 static int proc_ide_read_imodel
45         (char *page, char **start, off_t off, int count, int *eof, void *data)
46 {
47         ide_hwif_t      *hwif = (ide_hwif_t *) data;
48         int             len;
49         const char      *name;
50
51         /*
52          * Neither ide_unknown nor ide_forced should be set at this point.
53          */
54         switch (hwif->chipset) {
55                 case ide_generic:       name = "generic";       break;
56                 case ide_pci:           name = "pci";           break;
57                 case ide_cmd640:        name = "cmd640";        break;
58                 case ide_dtc2278:       name = "dtc2278";       break;
59                 case ide_ali14xx:       name = "ali14xx";       break;
60                 case ide_qd65xx:        name = "qd65xx";        break;
61                 case ide_umc8672:       name = "umc8672";       break;
62                 case ide_ht6560b:       name = "ht6560b";       break;
63                 case ide_rz1000:        name = "rz1000";        break;
64                 case ide_trm290:        name = "trm290";        break;
65                 case ide_cmd646:        name = "cmd646";        break;
66                 case ide_cy82c693:      name = "cy82c693";      break;
67                 case ide_4drives:       name = "4drives";       break;
68                 case ide_pmac:          name = "mac-io";        break;
69                 case ide_au1xxx:        name = "au1xxx";        break;
70                 case ide_etrax100:      name = "etrax100";      break;
71                 case ide_acorn:         name = "acorn";         break;
72                 default:                name = "(unknown)";     break;
73         }
74         len = sprintf(page, "%s\n", name);
75         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
76 }
77
78 static int proc_ide_read_mate
79         (char *page, char **start, off_t off, int count, int *eof, void *data)
80 {
81         ide_hwif_t      *hwif = (ide_hwif_t *) data;
82         int             len;
83
84         if (hwif && hwif->mate && hwif->mate->present)
85                 len = sprintf(page, "%s\n", hwif->mate->name);
86         else
87                 len = sprintf(page, "(none)\n");
88         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
89 }
90
91 static int proc_ide_read_channel
92         (char *page, char **start, off_t off, int count, int *eof, void *data)
93 {
94         ide_hwif_t      *hwif = (ide_hwif_t *) data;
95         int             len;
96
97         page[0] = hwif->channel ? '1' : '0';
98         page[1] = '\n';
99         len = 2;
100         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
101 }
102
103 static int proc_ide_read_identify
104         (char *page, char **start, off_t off, int count, int *eof, void *data)
105 {
106         ide_drive_t     *drive = (ide_drive_t *)data;
107         int             len = 0, i = 0;
108         int             err = 0;
109
110         len = sprintf(page, "\n");
111
112         if (drive) {
113                 unsigned short *val = (unsigned short *) page;
114
115                 err = taskfile_lib_get_identify(drive, page);
116                 if (!err) {
117                         char *out = ((char *)page) + (SECTOR_WORDS * 4);
118                         page = out;
119                         do {
120                                 out += sprintf(out, "%04x%c",
121                                         le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
122                                 val += 1;
123                         } while (i < (SECTOR_WORDS * 2));
124                         len = out - page;
125                 }
126         }
127         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
128 }
129
130 /**
131  *      __ide_add_setting       -       add an ide setting option
132  *      @drive: drive to use
133  *      @name: setting name
134  *      @rw: true if the function is read write
135  *      @data_type: type of data
136  *      @min: range minimum
137  *      @max: range maximum
138  *      @mul_factor: multiplication scale
139  *      @div_factor: divison scale
140  *      @data: private data field
141  *      @set: setting
142  *      @auto_remove: setting auto removal flag
143  *
144  *      Removes the setting named from the device if it is present.
145  *      The function takes the settings_lock to protect against
146  *      parallel changes. This function must not be called from IRQ
147  *      context. Returns 0 on success or -1 on failure.
148  *
149  *      BUGS: This code is seriously over-engineered. There is also
150  *      magic about how the driver specific features are setup. If
151  *      a driver is attached we assume the driver settings are auto
152  *      remove.
153  */
154
155 static int __ide_add_setting(ide_drive_t *drive, const char *name, int rw, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set, int auto_remove)
156 {
157         ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
158
159         mutex_lock(&ide_setting_mtx);
160         while ((*p) && strcmp((*p)->name, name) < 0)
161                 p = &((*p)->next);
162         if ((setting = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
163                 goto abort;
164         if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
165                 goto abort;
166         strcpy(setting->name, name);
167         setting->rw = rw;
168         setting->data_type = data_type;
169         setting->min = min;
170         setting->max = max;
171         setting->mul_factor = mul_factor;
172         setting->div_factor = div_factor;
173         setting->data = data;
174         setting->set = set;
175
176         setting->next = *p;
177         if (auto_remove)
178                 setting->auto_remove = 1;
179         *p = setting;
180         mutex_unlock(&ide_setting_mtx);
181         return 0;
182 abort:
183         mutex_unlock(&ide_setting_mtx);
184         kfree(setting);
185         return -1;
186 }
187
188 int ide_add_setting(ide_drive_t *drive, const char *name, int rw, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
189 {
190         return __ide_add_setting(drive, name, rw, data_type, min, max, mul_factor, div_factor, data, set, 1);
191 }
192
193 EXPORT_SYMBOL(ide_add_setting);
194
195 /**
196  *      __ide_remove_setting    -       remove an ide setting option
197  *      @drive: drive to use
198  *      @name: setting name
199  *
200  *      Removes the setting named from the device if it is present.
201  *      The caller must hold the setting semaphore.
202  */
203
204 static void __ide_remove_setting (ide_drive_t *drive, char *name)
205 {
206         ide_settings_t **p, *setting;
207
208         p = (ide_settings_t **) &drive->settings;
209
210         while ((*p) && strcmp((*p)->name, name))
211                 p = &((*p)->next);
212         if ((setting = (*p)) == NULL)
213                 return;
214
215         (*p) = setting->next;
216
217         kfree(setting->name);
218         kfree(setting);
219 }
220
221 /**
222  *      auto_remove_settings    -       remove driver specific settings
223  *      @drive: drive
224  *
225  *      Automatically remove all the driver specific settings for this
226  *      drive. This function may not be called from IRQ context. The
227  *      caller must hold ide_setting_mtx.
228  */
229
230 static void auto_remove_settings (ide_drive_t *drive)
231 {
232         ide_settings_t *setting;
233 repeat:
234         setting = drive->settings;
235         while (setting) {
236                 if (setting->auto_remove) {
237                         __ide_remove_setting(drive, setting->name);
238                         goto repeat;
239                 }
240                 setting = setting->next;
241         }
242 }
243
244 /**
245  *      ide_find_setting_by_name        -       find a drive specific setting
246  *      @drive: drive to scan
247  *      @name: setting name
248  *
249  *      Scan's the device setting table for a matching entry and returns
250  *      this or NULL if no entry is found. The caller must hold the
251  *      setting semaphore
252  */
253
254 static ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name)
255 {
256         ide_settings_t *setting = drive->settings;
257
258         while (setting) {
259                 if (strcmp(setting->name, name) == 0)
260                         break;
261                 setting = setting->next;
262         }
263         return setting;
264 }
265
266 /**
267  *      ide_read_setting        -       read an IDE setting
268  *      @drive: drive to read from
269  *      @setting: drive setting
270  *
271  *      Read a drive setting and return the value. The caller
272  *      must hold the ide_setting_mtx when making this call.
273  *
274  *      BUGS: the data return and error are the same return value
275  *      so an error -EINVAL and true return of the same value cannot
276  *      be told apart
277  */
278
279 static int ide_read_setting(ide_drive_t *drive, ide_settings_t *setting)
280 {
281         int             val = -EINVAL;
282         unsigned long   flags;
283
284         if ((setting->rw & SETTING_READ)) {
285                 spin_lock_irqsave(&ide_lock, flags);
286                 switch(setting->data_type) {
287                         case TYPE_BYTE:
288                                 val = *((u8 *) setting->data);
289                                 break;
290                         case TYPE_SHORT:
291                                 val = *((u16 *) setting->data);
292                                 break;
293                         case TYPE_INT:
294                                 val = *((u32 *) setting->data);
295                                 break;
296                 }
297                 spin_unlock_irqrestore(&ide_lock, flags);
298         }
299         return val;
300 }
301
302 /**
303  *      ide_write_setting       -       read an IDE setting
304  *      @drive: drive to read from
305  *      @setting: drive setting
306  *      @val: value
307  *
308  *      Write a drive setting if it is possible. The caller
309  *      must hold the ide_setting_mtx when making this call.
310  *
311  *      BUGS: the data return and error are the same return value
312  *      so an error -EINVAL and true return of the same value cannot
313  *      be told apart
314  *
315  *      FIXME:  This should be changed to enqueue a special request
316  *      to the driver to change settings, and then wait on a sema for completion.
317  *      The current scheme of polling is kludgy, though safe enough.
318  */
319
320 static int ide_write_setting(ide_drive_t *drive, ide_settings_t *setting, int val)
321 {
322         if (!capable(CAP_SYS_ADMIN))
323                 return -EACCES;
324         if (setting->set)
325                 return setting->set(drive, val);
326         if (!(setting->rw & SETTING_WRITE))
327                 return -EPERM;
328         if (val < setting->min || val > setting->max)
329                 return -EINVAL;
330         if (ide_spin_wait_hwgroup(drive))
331                 return -EBUSY;
332         switch (setting->data_type) {
333                 case TYPE_BYTE:
334                         *((u8 *) setting->data) = val;
335                         break;
336                 case TYPE_SHORT:
337                         *((u16 *) setting->data) = val;
338                         break;
339                 case TYPE_INT:
340                         *((u32 *) setting->data) = val;
341                         break;
342         }
343         spin_unlock_irq(&ide_lock);
344         return 0;
345 }
346
347 static int set_xfer_rate (ide_drive_t *drive, int arg)
348 {
349         int err;
350
351         if (arg < 0 || arg > 70)
352                 return -EINVAL;
353
354         err = ide_wait_cmd(drive,
355                         WIN_SETFEATURES, (u8) arg,
356                         SETFEATURES_XFER, 0, NULL);
357
358         if (!err && arg) {
359                 ide_set_xfer_rate(drive, (u8) arg);
360                 ide_driveid_update(drive);
361         }
362         return err;
363 }
364
365 /**
366  *      ide_add_generic_settings        -       generic ide settings
367  *      @drive: drive being configured
368  *
369  *      Add the generic parts of the system settings to the /proc files.
370  *      The caller must not be holding the ide_setting_mtx.
371  */
372
373 void ide_add_generic_settings (ide_drive_t *drive)
374 {
375 /*
376  *                        drive         setting name            read/write access                               data type       min     max                             mul_factor      div_factor      data pointer                    set function
377  */
378         __ide_add_setting(drive,        "io_32bit",             drive->no_io_32bit ? SETTING_READ : SETTING_RW, TYPE_BYTE,      0,      1 + (SUPPORT_VLB_SYNC << 1),    1,              1,              &drive->io_32bit,               set_io_32bit,   0);
379         __ide_add_setting(drive,        "keepsettings",         SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->keep_settings,          NULL,           0);
380         __ide_add_setting(drive,        "nice1",                SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->nice1,                  NULL,           0);
381         __ide_add_setting(drive,        "pio_mode",             SETTING_WRITE,                                  TYPE_BYTE,      0,      255,                            1,              1,              NULL,                           set_pio_mode,   0);
382         __ide_add_setting(drive,        "unmaskirq",            drive->no_unmask ? SETTING_READ : SETTING_RW,   TYPE_BYTE,      0,      1,                              1,              1,              &drive->unmask,                 NULL,           0);
383         __ide_add_setting(drive,        "using_dma",            SETTING_RW,                                     TYPE_BYTE,      0,      1,                              1,              1,              &drive->using_dma,              set_using_dma,  0);
384         __ide_add_setting(drive,        "init_speed",           SETTING_RW,                                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->init_speed,             NULL,           0);
385         __ide_add_setting(drive,        "current_speed",        SETTING_RW,                                     TYPE_BYTE,      0,      70,                             1,              1,              &drive->current_speed,          set_xfer_rate,  0);
386         __ide_add_setting(drive,        "number",               SETTING_RW,                                     TYPE_BYTE,      0,      3,                              1,              1,              &drive->dn,                     NULL,           0);
387 }
388
389 static void proc_ide_settings_warn(void)
390 {
391         static int warned = 0;
392
393         if (warned)
394                 return;
395
396         printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
397                             "obsolete, and will be removed soon!\n");
398         warned = 1;
399 }
400
401 static int proc_ide_read_settings
402         (char *page, char **start, off_t off, int count, int *eof, void *data)
403 {
404         ide_drive_t     *drive = (ide_drive_t *) data;
405         ide_settings_t  *setting = (ide_settings_t *) drive->settings;
406         char            *out = page;
407         int             len, rc, mul_factor, div_factor;
408
409         proc_ide_settings_warn();
410
411         mutex_lock(&ide_setting_mtx);
412         out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
413         out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
414         while(setting) {
415                 mul_factor = setting->mul_factor;
416                 div_factor = setting->div_factor;
417                 out += sprintf(out, "%-24s", setting->name);
418                 if ((rc = ide_read_setting(drive, setting)) >= 0)
419                         out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
420                 else
421                         out += sprintf(out, "%-16s", "write-only");
422                 out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
423                 if (setting->rw & SETTING_READ)
424                         out += sprintf(out, "r");
425                 if (setting->rw & SETTING_WRITE)
426                         out += sprintf(out, "w");
427                 out += sprintf(out, "\n");
428                 setting = setting->next;
429         }
430         len = out - page;
431         mutex_unlock(&ide_setting_mtx);
432         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
433 }
434
435 #define MAX_LEN 30
436
437 static int proc_ide_write_settings(struct file *file, const char __user *buffer,
438                                    unsigned long count, void *data)
439 {
440         ide_drive_t     *drive = (ide_drive_t *) data;
441         char            name[MAX_LEN + 1];
442         int             for_real = 0;
443         unsigned long   n;
444         ide_settings_t  *setting;
445         char *buf, *s;
446
447         if (!capable(CAP_SYS_ADMIN))
448                 return -EACCES;
449
450         proc_ide_settings_warn();
451
452         if (count >= PAGE_SIZE)
453                 return -EINVAL;
454
455         s = buf = (char *)__get_free_page(GFP_USER);
456         if (!buf)
457                 return -ENOMEM;
458
459         if (copy_from_user(buf, buffer, count)) {
460                 free_page((unsigned long)buf);
461                 return -EFAULT;
462         }
463
464         buf[count] = '\0';
465
466         /*
467          * Skip over leading whitespace
468          */
469         while (count && isspace(*s)) {
470                 --count;
471                 ++s;
472         }
473         /*
474          * Do one full pass to verify all parameters,
475          * then do another to actually write the new settings.
476          */
477         do {
478                 char *p = s;
479                 n = count;
480                 while (n > 0) {
481                         unsigned val;
482                         char *q = p;
483
484                         while (n > 0 && *p != ':') {
485                                 --n;
486                                 p++;
487                         }
488                         if (*p != ':')
489                                 goto parse_error;
490                         if (p - q > MAX_LEN)
491                                 goto parse_error;
492                         memcpy(name, q, p - q);
493                         name[p - q] = 0;
494
495                         if (n > 0) {
496                                 --n;
497                                 p++;
498                         } else
499                                 goto parse_error;
500
501                         val = simple_strtoul(p, &q, 10);
502                         n -= q - p;
503                         p = q;
504                         if (n > 0 && !isspace(*p))
505                                 goto parse_error;
506                         while (n > 0 && isspace(*p)) {
507                                 --n;
508                                 ++p;
509                         }
510
511                         mutex_lock(&ide_setting_mtx);
512                         setting = ide_find_setting_by_name(drive, name);
513                         if (!setting)
514                         {
515                                 mutex_unlock(&ide_setting_mtx);
516                                 goto parse_error;
517                         }
518                         if (for_real)
519                                 ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
520                         mutex_unlock(&ide_setting_mtx);
521                 }
522         } while (!for_real++);
523         free_page((unsigned long)buf);
524         return count;
525 parse_error:
526         free_page((unsigned long)buf);
527         printk("proc_ide_write_settings(): parse error\n");
528         return -EINVAL;
529 }
530
531 int proc_ide_read_capacity
532         (char *page, char **start, off_t off, int count, int *eof, void *data)
533 {
534         int len = sprintf(page,"%llu\n", (long long)0x7fffffff);
535         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
536 }
537
538 EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
539
540 int proc_ide_read_geometry
541         (char *page, char **start, off_t off, int count, int *eof, void *data)
542 {
543         ide_drive_t     *drive = (ide_drive_t *) data;
544         char            *out = page;
545         int             len;
546
547         out += sprintf(out,"physical     %d/%d/%d\n",
548                         drive->cyl, drive->head, drive->sect);
549         out += sprintf(out,"logical      %d/%d/%d\n",
550                         drive->bios_cyl, drive->bios_head, drive->bios_sect);
551
552         len = out - page;
553         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
554 }
555
556 EXPORT_SYMBOL(proc_ide_read_geometry);
557
558 static int proc_ide_read_dmodel
559         (char *page, char **start, off_t off, int count, int *eof, void *data)
560 {
561         ide_drive_t     *drive = (ide_drive_t *) data;
562         struct hd_driveid *id = drive->id;
563         int             len;
564
565         len = sprintf(page, "%.40s\n",
566                 (id && id->model[0]) ? (char *)id->model : "(none)");
567         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
568 }
569
570 static int proc_ide_read_driver
571         (char *page, char **start, off_t off, int count, int *eof, void *data)
572 {
573         ide_drive_t     *drive = (ide_drive_t *) data;
574         struct device   *dev = &drive->gendev;
575         ide_driver_t    *ide_drv;
576         int             len;
577
578         if (dev->driver) {
579                 ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
580                 len = sprintf(page, "%s version %s\n",
581                                 dev->driver->name, ide_drv->version);
582         } else
583                 len = sprintf(page, "ide-default version 0.9.newide\n");
584         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
585 }
586
587 static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
588 {
589         struct device *dev = &drive->gendev;
590         int ret = 1;
591         int err;
592
593         device_release_driver(dev);
594         /* FIXME: device can still be in use by previous driver */
595         strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
596         err = device_attach(dev);
597         if (err < 0)
598                 printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
599                         __FUNCTION__, err);
600         drive->driver_req[0] = 0;
601         if (dev->driver == NULL) {
602                 err = device_attach(dev);
603                 if (err < 0)
604                         printk(KERN_WARNING
605                                 "IDE: %s: device_attach(2) error: %d\n",
606                                 __FUNCTION__, err);
607         }
608         if (dev->driver && !strcmp(dev->driver->name, driver))
609                 ret = 0;
610
611         return ret;
612 }
613
614 static int proc_ide_write_driver
615         (struct file *file, const char __user *buffer, unsigned long count, void *data)
616 {
617         ide_drive_t     *drive = (ide_drive_t *) data;
618         char name[32];
619
620         if (!capable(CAP_SYS_ADMIN))
621                 return -EACCES;
622         if (count > 31)
623                 count = 31;
624         if (copy_from_user(name, buffer, count))
625                 return -EFAULT;
626         name[count] = '\0';
627         if (ide_replace_subdriver(drive, name))
628                 return -EINVAL;
629         return count;
630 }
631
632 static int proc_ide_read_media
633         (char *page, char **start, off_t off, int count, int *eof, void *data)
634 {
635         ide_drive_t     *drive = (ide_drive_t *) data;
636         const char      *media;
637         int             len;
638
639         switch (drive->media) {
640                 case ide_disk:  media = "disk\n";
641                                 break;
642                 case ide_cdrom: media = "cdrom\n";
643                                 break;
644                 case ide_tape:  media = "tape\n";
645                                 break;
646                 case ide_floppy:media = "floppy\n";
647                                 break;
648                 case ide_optical:media = "optical\n";
649                                 break;
650                 default:        media = "UNKNOWN\n";
651                                 break;
652         }
653         strcpy(page,media);
654         len = strlen(media);
655         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
656 }
657
658 static ide_proc_entry_t generic_drive_entries[] = {
659         { "driver",     S_IFREG|S_IRUGO,        proc_ide_read_driver,   proc_ide_write_driver },
660         { "identify",   S_IFREG|S_IRUSR,        proc_ide_read_identify, NULL },
661         { "media",      S_IFREG|S_IRUGO,        proc_ide_read_media,    NULL },
662         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_dmodel,   NULL },
663         { "settings",   S_IFREG|S_IRUSR|S_IWUSR,proc_ide_read_settings, proc_ide_write_settings },
664         { NULL, 0, NULL, NULL }
665 };
666
667 static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
668 {
669         struct proc_dir_entry *ent;
670
671         if (!dir || !p)
672                 return;
673         while (p->name != NULL) {
674                 ent = create_proc_entry(p->name, p->mode, dir);
675                 if (!ent) return;
676                 ent->data = data;
677                 ent->read_proc = p->read_proc;
678                 ent->write_proc = p->write_proc;
679                 p++;
680         }
681 }
682
683 static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
684 {
685         if (!dir || !p)
686                 return;
687         while (p->name != NULL) {
688                 remove_proc_entry(p->name, dir);
689                 p++;
690         }
691 }
692
693 void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
694 {
695         ide_add_proc_entries(drive->proc, driver->proc, drive);
696 }
697
698 EXPORT_SYMBOL(ide_proc_register_driver);
699
700 /**
701  *      ide_proc_unregister_driver      -       remove driver specific data
702  *      @drive: drive
703  *      @driver: driver
704  *
705  *      Clean up the driver specific /proc files and IDE settings
706  *      for a given drive.
707  *
708  *      Takes ide_setting_mtx and ide_lock.
709  *      Caller must hold none of the locks.
710  */
711
712 void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
713 {
714         unsigned long flags;
715
716         ide_remove_proc_entries(drive->proc, driver->proc);
717
718         mutex_lock(&ide_setting_mtx);
719         spin_lock_irqsave(&ide_lock, flags);
720         /*
721          * ide_setting_mtx protects the settings list
722          * ide_lock protects the use of settings
723          *
724          * so we need to hold both, ide_settings_sem because we want to
725          * modify the settings list, and ide_lock because we cannot take
726          * a setting out that is being used.
727          *
728          * OTOH both ide_{read,write}_setting are only ever used under
729          * ide_setting_mtx.
730          */
731         auto_remove_settings(drive);
732         spin_unlock_irqrestore(&ide_lock, flags);
733         mutex_unlock(&ide_setting_mtx);
734 }
735
736 EXPORT_SYMBOL(ide_proc_unregister_driver);
737
738 static void create_proc_ide_drives(ide_hwif_t *hwif)
739 {
740         int     d;
741         struct proc_dir_entry *ent;
742         struct proc_dir_entry *parent = hwif->proc;
743         char name[64];
744
745         for (d = 0; d < MAX_DRIVES; d++) {
746                 ide_drive_t *drive = &hwif->drives[d];
747
748                 if (!drive->present)
749                         continue;
750                 if (drive->proc)
751                         continue;
752
753                 drive->proc = proc_mkdir(drive->name, parent);
754                 if (drive->proc)
755                         ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
756                 sprintf(name,"ide%d/%s", (drive->name[2]-'a')/2, drive->name);
757                 ent = proc_symlink(drive->name, proc_ide_root, name);
758                 if (!ent) return;
759         }
760 }
761
762 static void destroy_proc_ide_device(ide_hwif_t *hwif, ide_drive_t *drive)
763 {
764         if (drive->proc) {
765                 ide_remove_proc_entries(drive->proc, generic_drive_entries);
766                 remove_proc_entry(drive->name, proc_ide_root);
767                 remove_proc_entry(drive->name, hwif->proc);
768                 drive->proc = NULL;
769         }
770 }
771
772 static void destroy_proc_ide_drives(ide_hwif_t *hwif)
773 {
774         int     d;
775
776         for (d = 0; d < MAX_DRIVES; d++) {
777                 ide_drive_t *drive = &hwif->drives[d];
778                 if (drive->proc)
779                         destroy_proc_ide_device(hwif, drive);
780         }
781 }
782
783 static ide_proc_entry_t hwif_entries[] = {
784         { "channel",    S_IFREG|S_IRUGO,        proc_ide_read_channel,  NULL },
785         { "mate",       S_IFREG|S_IRUGO,        proc_ide_read_mate,     NULL },
786         { "model",      S_IFREG|S_IRUGO,        proc_ide_read_imodel,   NULL },
787         { NULL, 0, NULL, NULL }
788 };
789
790 void ide_proc_register_port(ide_hwif_t *hwif)
791 {
792         if (!hwif->present)
793                 return;
794
795         if (!hwif->proc) {
796                 hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
797
798                 if (!hwif->proc)
799                         return;
800
801                 ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
802         }
803
804         create_proc_ide_drives(hwif);
805 }
806
807 EXPORT_SYMBOL_GPL(ide_proc_register_port);
808
809 #ifdef CONFIG_BLK_DEV_IDEPCI
810 void ide_pci_create_host_proc(const char *name, get_info_t *get_info)
811 {
812         create_proc_info_entry(name, 0, proc_ide_root, get_info);
813 }
814
815 EXPORT_SYMBOL_GPL(ide_pci_create_host_proc);
816 #endif
817
818 void ide_proc_unregister_port(ide_hwif_t *hwif)
819 {
820         if (hwif->proc) {
821                 destroy_proc_ide_drives(hwif);
822                 ide_remove_proc_entries(hwif->proc, hwif_entries);
823                 remove_proc_entry(hwif->name, proc_ide_root);
824                 hwif->proc = NULL;
825         }
826 }
827
828 static int proc_print_driver(struct device_driver *drv, void *data)
829 {
830         ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
831         struct seq_file *s = data;
832
833         seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
834
835         return 0;
836 }
837
838 static int ide_drivers_show(struct seq_file *s, void *p)
839 {
840         int err;
841
842         err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
843         if (err < 0)
844                 printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
845                         __FUNCTION__, err);
846         return 0;
847 }
848
849 static int ide_drivers_open(struct inode *inode, struct file *file)
850 {
851         return single_open(file, &ide_drivers_show, NULL);
852 }
853
854 static const struct file_operations ide_drivers_operations = {
855         .open           = ide_drivers_open,
856         .read           = seq_read,
857         .llseek         = seq_lseek,
858         .release        = single_release,
859 };
860
861 void proc_ide_create(void)
862 {
863         struct proc_dir_entry *entry;
864
865         proc_ide_root = proc_mkdir("ide", NULL);
866
867         if (!proc_ide_root)
868                 return;
869
870         entry = create_proc_entry("drivers", 0, proc_ide_root);
871         if (entry)
872                 entry->proc_fops = &ide_drivers_operations;
873 }
874
875 void proc_ide_destroy(void)
876 {
877         remove_proc_entry("drivers", proc_ide_root);
878         remove_proc_entry("ide", NULL);
879 }