Root/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
32static struct proc_dir_entry *proc_ide_root;
33
34static 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
59static 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
64static 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
72static 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
83static 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
88static 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
96static 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
104static 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
109static 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
117static 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
144static 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
149static 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
167static
168const 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
192static 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
222static 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
237ide_devset_get(xfer_rate, current_speed);
238
239static 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
257ide_devset_rw(current_speed, xfer_rate);
258ide_devset_rw_field(init_speed, init_speed);
259ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
260ide_devset_rw_field(number, dn);
261
262static 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
275static 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
281static 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
326static 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
333static 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;
429parse_error:
430    free_page((unsigned long)buf);
431    printk("%s(): parse error\n", __func__);
432    return -EINVAL;
433}
434
435static 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
444static 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
450static int ide_capacity_proc_open(struct inode *inode, struct file *file)
451{
452    return single_open(file, ide_capacity_proc_show, NULL);
453}
454
455const 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};
462EXPORT_SYMBOL_GPL(ide_capacity_proc_fops);
463
464static 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
475static 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
480const 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};
487EXPORT_SYMBOL(ide_geometry_proc_fops);
488
489static 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
498static 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
503static 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
511static 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
526static 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
531static 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
558static 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
576static 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
585static 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
602static 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
607static 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
615static 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
624static 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
637static 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
647void 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
656EXPORT_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
669void 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}
681EXPORT_SYMBOL(ide_proc_unregister_driver);
682
683void 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
704void 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
714static 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
721void 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
733void 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
742static 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
752static 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
763static int ide_drivers_open(struct inode *inode, struct file *file)
764{
765    return single_open(file, &ide_drivers_show, NULL);
766}
767
768static 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
776void 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
786void proc_ide_destroy(void)
787{
788    remove_proc_entry("drivers", proc_ide_root);
789    remove_proc_entry("ide", NULL);
790}
791

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