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USB: remove err() macro from usb misc drivers
[linux/fpc-iii.git] / drivers / usb / core / inode.c
blob94632264dccf253edf9a07e8278f4b33fa28eaad
1 /*****************************************************************************/
2
3 /*
4 * inode.c -- Inode/Dentry functions for the USB device file system.
5 *
6 * Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 * Copyright (C) 2001,2002,2004 Greg Kroah-Hartman (greg@kroah.com)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * History:
24 * 0.1 04.01.2000 Created
25 * 0.2 10.12.2001 converted to use the vfs layer better
26 */
27
28 /*****************************************************************************/
29
30 #include <linux/module.h>
31 #include <linux/fs.h>
32 #include <linux/mount.h>
33 #include <linux/pagemap.h>
34 #include <linux/init.h>
35 #include <linux/proc_fs.h>
36 #include <linux/usb.h>
37 #include <linux/namei.h>
38 #include <linux/usbdevice_fs.h>
39 #include <linux/parser.h>
40 #include <linux/notifier.h>
41 #include <linux/seq_file.h>
42 #include <asm/byteorder.h>
43 #include "usb.h"
44 #include "hcd.h"
45
46 #define USBFS_DEFAULT_DEVMODE (S_IWUSR | S_IRUGO)
47 #define USBFS_DEFAULT_BUSMODE (S_IXUGO | S_IRUGO)
48 #define USBFS_DEFAULT_LISTMODE S_IRUGO
49
50 static struct super_operations usbfs_ops;
51 static const struct file_operations default_file_operations;
52 static struct vfsmount *usbfs_mount;
53 static int usbfs_mount_count; /* = 0 */
54 static int ignore_mount = 0;
55
56 static struct dentry *devices_usbfs_dentry;
57 static int num_buses; /* = 0 */
58
59 static uid_t devuid; /* = 0 */
60 static uid_t busuid; /* = 0 */
61 static uid_t listuid; /* = 0 */
62 static gid_t devgid; /* = 0 */
63 static gid_t busgid; /* = 0 */
64 static gid_t listgid; /* = 0 */
65 static umode_t devmode = USBFS_DEFAULT_DEVMODE;
66 static umode_t busmode = USBFS_DEFAULT_BUSMODE;
67 static umode_t listmode = USBFS_DEFAULT_LISTMODE;
68
69 static int usbfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
70 {
71 if (devuid != 0)
72 seq_printf(seq, ",devuid=%u", devuid);
73 if (devgid != 0)
74 seq_printf(seq, ",devgid=%u", devgid);
75 if (devmode != USBFS_DEFAULT_DEVMODE)
76 seq_printf(seq, ",devmode=%o", devmode);
77 if (busuid != 0)
78 seq_printf(seq, ",busuid=%u", busuid);
79 if (busgid != 0)
80 seq_printf(seq, ",busgid=%u", busgid);
81 if (busmode != USBFS_DEFAULT_BUSMODE)
82 seq_printf(seq, ",busmode=%o", busmode);
83 if (listuid != 0)
84 seq_printf(seq, ",listuid=%u", listuid);
85 if (listgid != 0)
86 seq_printf(seq, ",listgid=%u", listgid);
87 if (listmode != USBFS_DEFAULT_LISTMODE)
88 seq_printf(seq, ",listmode=%o", listmode);
89
90 return 0;
91 }
92
93 enum {
94 Opt_devuid, Opt_devgid, Opt_devmode,
95 Opt_busuid, Opt_busgid, Opt_busmode,
96 Opt_listuid, Opt_listgid, Opt_listmode,
97 Opt_err,
98 };
99
100 static const match_table_t tokens = {
101 {Opt_devuid, "devuid=%u"},
102 {Opt_devgid, "devgid=%u"},
103 {Opt_devmode, "devmode=%o"},
104 {Opt_busuid, "busuid=%u"},
105 {Opt_busgid, "busgid=%u"},
106 {Opt_busmode, "busmode=%o"},
107 {Opt_listuid, "listuid=%u"},
108 {Opt_listgid, "listgid=%u"},
109 {Opt_listmode, "listmode=%o"},
110 {Opt_err, NULL}
111 };
112
113 static int parse_options(struct super_block *s, char *data)
114 {
115 char *p;
116 int option;
117
118 /* (re)set to defaults. */
119 devuid = 0;
120 busuid = 0;
121 listuid = 0;
122 devgid = 0;
123 busgid = 0;
124 listgid = 0;
125 devmode = USBFS_DEFAULT_DEVMODE;
126 busmode = USBFS_DEFAULT_BUSMODE;
127 listmode = USBFS_DEFAULT_LISTMODE;
128
129 while ((p = strsep(&data, ",")) != NULL) {
130 substring_t args[MAX_OPT_ARGS];
131 int token;
132 if (!*p)
133 continue;
134
135 token = match_token(p, tokens, args);
136 switch (token) {
137 case Opt_devuid:
138 if (match_int(&args[0], &option))
139 return -EINVAL;
140 devuid = option;
141 break;
142 case Opt_devgid:
143 if (match_int(&args[0], &option))
144 return -EINVAL;
145 devgid = option;
146 break;
147 case Opt_devmode:
148 if (match_octal(&args[0], &option))
149 return -EINVAL;
150 devmode = option & S_IRWXUGO;
151 break;
152 case Opt_busuid:
153 if (match_int(&args[0], &option))
154 return -EINVAL;
155 busuid = option;
156 break;
157 case Opt_busgid:
158 if (match_int(&args[0], &option))
159 return -EINVAL;
160 busgid = option;
161 break;
162 case Opt_busmode:
163 if (match_octal(&args[0], &option))
164 return -EINVAL;
165 busmode = option & S_IRWXUGO;
166 break;
167 case Opt_listuid:
168 if (match_int(&args[0], &option))
169 return -EINVAL;
170 listuid = option;
171 break;
172 case Opt_listgid:
173 if (match_int(&args[0], &option))
174 return -EINVAL;
175 listgid = option;
176 break;
177 case Opt_listmode:
178 if (match_octal(&args[0], &option))
179 return -EINVAL;
180 listmode = option & S_IRWXUGO;
181 break;
182 default:
183 printk(KERN_ERR "usbfs: unrecognised mount option "
184 "\"%s\" or missing value\n", p);
185 return -EINVAL;
186 }
187 }
188
189 return 0;
190 }
191
192 static void update_special(struct dentry *special)
193 {
194 special->d_inode->i_uid = listuid;
195 special->d_inode->i_gid = listgid;
196 special->d_inode->i_mode = S_IFREG | listmode;
197 }
198
199 static void update_dev(struct dentry *dev)
200 {
201 dev->d_inode->i_uid = devuid;
202 dev->d_inode->i_gid = devgid;
203 dev->d_inode->i_mode = S_IFREG | devmode;
204 }
205
206 static void update_bus(struct dentry *bus)
207 {
208 struct dentry *dev = NULL;
209
210 bus->d_inode->i_uid = busuid;
211 bus->d_inode->i_gid = busgid;
212 bus->d_inode->i_mode = S_IFDIR | busmode;
213
214 mutex_lock(&bus->d_inode->i_mutex);
215
216 list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
217 if (dev->d_inode)
218 update_dev(dev);
219
220 mutex_unlock(&bus->d_inode->i_mutex);
221 }
222
223 static void update_sb(struct super_block *sb)
224 {
225 struct dentry *root = sb->s_root;
226 struct dentry *bus = NULL;
227
228 if (!root)
229 return;
230
231 mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
232
233 list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
234 if (bus->d_inode) {
235 switch (S_IFMT & bus->d_inode->i_mode) {
236 case S_IFDIR:
237 update_bus(bus);
238 break;
239 case S_IFREG:
240 update_special(bus);
241 break;
242 default:
243 printk(KERN_WARNING "usbfs: Unknown node %s "
244 "mode %x found on remount!\n",
245 bus->d_name.name, bus->d_inode->i_mode);
246 break;
247 }
248 }
249 }
250
251 mutex_unlock(&root->d_inode->i_mutex);
252 }
253
254 static int remount(struct super_block *sb, int *flags, char *data)
255 {
256 /* If this is not a real mount,
257 * i.e. it's a simple_pin_fs from create_special_files,
258 * then ignore it.
259 */
260 if (ignore_mount)
261 return 0;
262
263 if (parse_options(sb, data)) {
264 printk(KERN_WARNING "usbfs: mount parameter error.\n");
265 return -EINVAL;
266 }
267
268 if (usbfs_mount && usbfs_mount->mnt_sb)
269 update_sb(usbfs_mount->mnt_sb);
270
271 return 0;
272 }
273
274 static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev)
275 {
276 struct inode *inode = new_inode(sb);
277
278 if (inode) {
279 inode->i_mode = mode;
280 inode->i_uid = current->fsuid;
281 inode->i_gid = current->fsgid;
282 inode->i_blocks = 0;
283 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
284 switch (mode & S_IFMT) {
285 default:
286 init_special_inode(inode, mode, dev);
287 break;
288 case S_IFREG:
289 inode->i_fop = &default_file_operations;
290 break;
291 case S_IFDIR:
292 inode->i_op = &simple_dir_inode_operations;
293 inode->i_fop = &simple_dir_operations;
294
295 /* directory inodes start off with i_nlink == 2 (for "." entry) */
296 inc_nlink(inode);
297 break;
298 }
299 }
300 return inode;
301 }
302
303 /* SMP-safe */
304 static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode,
305 dev_t dev)
306 {
307 struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev);
308 int error = -EPERM;
309
310 if (dentry->d_inode)
311 return -EEXIST;
312
313 if (inode) {
314 d_instantiate(dentry, inode);
315 dget(dentry);
316 error = 0;
317 }
318 return error;
319 }
320
321 static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode)
322 {
323 int res;
324
325 mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
326 res = usbfs_mknod (dir, dentry, mode, 0);
327 if (!res)
328 inc_nlink(dir);
329 return res;
330 }
331
332 static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode)
333 {
334 mode = (mode & S_IALLUGO) | S_IFREG;
335 return usbfs_mknod (dir, dentry, mode, 0);
336 }
337
338 static inline int usbfs_positive (struct dentry *dentry)
339 {
340 return dentry->d_inode && !d_unhashed(dentry);
341 }
342
343 static int usbfs_empty (struct dentry *dentry)
344 {
345 struct list_head *list;
346
347 spin_lock(&dcache_lock);
348
349 list_for_each(list, &dentry->d_subdirs) {
350 struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
351 if (usbfs_positive(de)) {
352 spin_unlock(&dcache_lock);
353 return 0;
354 }
355 }
356
357 spin_unlock(&dcache_lock);
358 return 1;
359 }
360
361 static int usbfs_unlink (struct inode *dir, struct dentry *dentry)
362 {
363 struct inode *inode = dentry->d_inode;
364 mutex_lock(&inode->i_mutex);
365 drop_nlink(dentry->d_inode);
366 dput(dentry);
367 mutex_unlock(&inode->i_mutex);
368 d_delete(dentry);
369 return 0;
370 }
371
372 static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
373 {
374 int error = -ENOTEMPTY;
375 struct inode * inode = dentry->d_inode;
376
377 mutex_lock(&inode->i_mutex);
378 dentry_unhash(dentry);
379 if (usbfs_empty(dentry)) {
380 drop_nlink(dentry->d_inode);
381 drop_nlink(dentry->d_inode);
382 dput(dentry);
383 inode->i_flags |= S_DEAD;
384 drop_nlink(dir);
385 error = 0;
386 }
387 mutex_unlock(&inode->i_mutex);
388 if (!error)
389 d_delete(dentry);
390 dput(dentry);
391 return error;
392 }
393
394
395 /* default file operations */
396 static ssize_t default_read_file (struct file *file, char __user *buf,
397 size_t count, loff_t *ppos)
398 {
399 return 0;
400 }
401
402 static ssize_t default_write_file (struct file *file, const char __user *buf,
403 size_t count, loff_t *ppos)
404 {
405 return count;
406 }
407
408 static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
409 {
410 loff_t retval = -EINVAL;
411
412 mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
413 switch(orig) {
414 case 0:
415 if (offset > 0) {
416 file->f_pos = offset;
417 retval = file->f_pos;
418 }
419 break;
420 case 1:
421 if ((offset + file->f_pos) > 0) {
422 file->f_pos += offset;
423 retval = file->f_pos;
424 }
425 break;
426 default:
427 break;
428 }
429 mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
430 return retval;
431 }
432
433 static int default_open (struct inode *inode, struct file *file)
434 {
435 if (inode->i_private)
436 file->private_data = inode->i_private;
437
438 return 0;
439 }
440
441 static const struct file_operations default_file_operations = {
442 .read = default_read_file,
443 .write = default_write_file,
444 .open = default_open,
445 .llseek = default_file_lseek,
446 };
447
448 static struct super_operations usbfs_ops = {
449 .statfs = simple_statfs,
450 .drop_inode = generic_delete_inode,
451 .remount_fs = remount,
452 .show_options = usbfs_show_options,
453 };
454
455 static int usbfs_fill_super(struct super_block *sb, void *data, int silent)
456 {
457 struct inode *inode;
458 struct dentry *root;
459
460 sb->s_blocksize = PAGE_CACHE_SIZE;
461 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
462 sb->s_magic = USBDEVICE_SUPER_MAGIC;
463 sb->s_op = &usbfs_ops;
464 sb->s_time_gran = 1;
465 inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0);
466
467 if (!inode) {
468 dbg("%s: could not get inode!",__func__);
469 return -ENOMEM;
470 }
471
472 root = d_alloc_root(inode);
473 if (!root) {
474 dbg("%s: could not get root dentry!",__func__);
475 iput(inode);
476 return -ENOMEM;
477 }
478 sb->s_root = root;
479 return 0;
480 }
481
482 /*
483 * fs_create_by_name - create a file, given a name
484 * @name: name of file
485 * @mode: type of file
486 * @parent: dentry of directory to create it in
487 * @dentry: resulting dentry of file
488 *
489 * This function handles both regular files and directories.
490 */
491 static int fs_create_by_name (const char *name, mode_t mode,
492 struct dentry *parent, struct dentry **dentry)
493 {
494 int error = 0;
495
496 /* If the parent is not specified, we create it in the root.
497 * We need the root dentry to do this, which is in the super
498 * block. A pointer to that is in the struct vfsmount that we
499 * have around.
500 */
501 if (!parent ) {
502 if (usbfs_mount && usbfs_mount->mnt_sb) {
503 parent = usbfs_mount->mnt_sb->s_root;
504 }
505 }
506
507 if (!parent) {
508 dbg("Ah! can not find a parent!");
509 return -EFAULT;
510 }
511
512 *dentry = NULL;
513 mutex_lock(&parent->d_inode->i_mutex);
514 *dentry = lookup_one_len(name, parent, strlen(name));
515 if (!IS_ERR(dentry)) {
516 if ((mode & S_IFMT) == S_IFDIR)
517 error = usbfs_mkdir (parent->d_inode, *dentry, mode);
518 else
519 error = usbfs_create (parent->d_inode, *dentry, mode);
520 } else
521 error = PTR_ERR(dentry);
522 mutex_unlock(&parent->d_inode->i_mutex);
523
524 return error;
525 }
526
527 static struct dentry *fs_create_file (const char *name, mode_t mode,
528 struct dentry *parent, void *data,
529 const struct file_operations *fops,
530 uid_t uid, gid_t gid)
531 {
532 struct dentry *dentry;
533 int error;
534
535 dbg("creating file '%s'",name);
536
537 error = fs_create_by_name (name, mode, parent, &dentry);
538 if (error) {
539 dentry = NULL;
540 } else {
541 if (dentry->d_inode) {
542 if (data)
543 dentry->d_inode->i_private = data;
544 if (fops)
545 dentry->d_inode->i_fop = fops;
546 dentry->d_inode->i_uid = uid;
547 dentry->d_inode->i_gid = gid;
548 }
549 }
550
551 return dentry;
552 }
553
554 static void fs_remove_file (struct dentry *dentry)
555 {
556 struct dentry *parent = dentry->d_parent;
557
558 if (!parent || !parent->d_inode)
559 return;
560
561 mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT);
562 if (usbfs_positive(dentry)) {
563 if (dentry->d_inode) {
564 if (S_ISDIR(dentry->d_inode->i_mode))
565 usbfs_rmdir(parent->d_inode, dentry);
566 else
567 usbfs_unlink(parent->d_inode, dentry);
568 dput(dentry);
569 }
570 }
571 mutex_unlock(&parent->d_inode->i_mutex);
572 }
573
574 /* --------------------------------------------------------------------- */
575
576 static int usb_get_sb(struct file_system_type *fs_type,
577 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
578 {
579 return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt);
580 }
581
582 static struct file_system_type usb_fs_type = {
583 .owner = THIS_MODULE,
584 .name = "usbfs",
585 .get_sb = usb_get_sb,
586 .kill_sb = kill_litter_super,
587 };
588
589 /* --------------------------------------------------------------------- */
590
591 static int create_special_files (void)
592 {
593 struct dentry *parent;
594 int retval;
595
596 /* the simple_pin_fs calls will call remount with no options
597 * without this flag that would overwrite the real mount options (if any)
598 */
599 ignore_mount = 1;
600
601 /* create the devices special file */
602 retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
603 if (retval) {
604 printk(KERN_ERR "Unable to get usbfs mount\n");
605 goto exit;
606 }
607
608 ignore_mount = 0;
609
610 parent = usbfs_mount->mnt_sb->s_root;
611 devices_usbfs_dentry = fs_create_file ("devices",
612 listmode | S_IFREG, parent,
613 NULL, &usbfs_devices_fops,
614 listuid, listgid);
615 if (devices_usbfs_dentry == NULL) {
616 printk(KERN_ERR "Unable to create devices usbfs file\n");
617 retval = -ENODEV;
618 goto error_clean_mounts;
619 }
620
621 goto exit;
622
623 error_clean_mounts:
624 simple_release_fs(&usbfs_mount, &usbfs_mount_count);
625 exit:
626 return retval;
627 }
628
629 static void remove_special_files (void)
630 {
631 if (devices_usbfs_dentry)
632 fs_remove_file (devices_usbfs_dentry);
633 devices_usbfs_dentry = NULL;
634 simple_release_fs(&usbfs_mount, &usbfs_mount_count);
635 }
636
637 void usbfs_update_special (void)
638 {
639 struct inode *inode;
640
641 if (devices_usbfs_dentry) {
642 inode = devices_usbfs_dentry->d_inode;
643 if (inode)
644 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
645 }
646 }
647
648 static void usbfs_add_bus(struct usb_bus *bus)
649 {
650 struct dentry *parent;
651 char name[8];
652 int retval;
653
654 /* create the special files if this is the first bus added */
655 if (num_buses == 0) {
656 retval = create_special_files();
657 if (retval)
658 return;
659 }
660 ++num_buses;
661
662 sprintf (name, "%03d", bus->busnum);
663
664 parent = usbfs_mount->mnt_sb->s_root;
665 bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
666 bus, NULL, busuid, busgid);
667 if (bus->usbfs_dentry == NULL) {
668 printk(KERN_ERR "Error creating usbfs bus entry\n");
669 return;
670 }
671 }
672
673 static void usbfs_remove_bus(struct usb_bus *bus)
674 {
675 if (bus->usbfs_dentry) {
676 fs_remove_file (bus->usbfs_dentry);
677 bus->usbfs_dentry = NULL;
678 }
679
680 --num_buses;
681 if (num_buses <= 0) {
682 remove_special_files();
683 num_buses = 0;
684 }
685 }
686
687 static void usbfs_add_device(struct usb_device *dev)
688 {
689 char name[8];
690 int i;
691 int i_size;
692
693 sprintf (name, "%03d", dev->devnum);
694 dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG,
695 dev->bus->usbfs_dentry, dev,
696 &usbdev_file_operations,
697 devuid, devgid);
698 if (dev->usbfs_dentry == NULL) {
699 printk(KERN_ERR "Error creating usbfs device entry\n");
700 return;
701 }
702
703 /* Set the size of the device's file to be
704 * equal to the size of the device descriptors. */
705 i_size = sizeof (struct usb_device_descriptor);
706 for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) {
707 struct usb_config_descriptor *config =
708 (struct usb_config_descriptor *)dev->rawdescriptors[i];
709 i_size += le16_to_cpu(config->wTotalLength);
710 }
711 if (dev->usbfs_dentry->d_inode)
712 dev->usbfs_dentry->d_inode->i_size = i_size;
713 }
714
715 static void usbfs_remove_device(struct usb_device *dev)
716 {
717 if (dev->usbfs_dentry) {
718 fs_remove_file (dev->usbfs_dentry);
719 dev->usbfs_dentry = NULL;
720 }
721 usb_fs_classdev_common_remove(dev);
722 }
723
724 static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev)
725 {
726 switch (action) {
727 case USB_DEVICE_ADD:
728 usbfs_add_device(dev);
729 break;
730 case USB_DEVICE_REMOVE:
731 usbfs_remove_device(dev);
732 break;
733 case USB_BUS_ADD:
734 usbfs_add_bus(dev);
735 break;
736 case USB_BUS_REMOVE:
737 usbfs_remove_bus(dev);
738 }
739
740 usbfs_update_special();
741 usbfs_conn_disc_event();
742 return NOTIFY_OK;
743 }
744
745 static struct notifier_block usbfs_nb = {
746 .notifier_call = usbfs_notify,
747 };
748
749 /* --------------------------------------------------------------------- */
750
751 static struct proc_dir_entry *usbdir = NULL;
752
753 int __init usbfs_init(void)
754 {
755 int retval;
756
757 retval = register_filesystem(&usb_fs_type);
758 if (retval)
759 return retval;
760
761 usb_register_notify(&usbfs_nb);
762
763 /* create mount point for usbfs */
764 usbdir = proc_mkdir("bus/usb", NULL);
765
766 return 0;
767 }
768
769 void usbfs_cleanup(void)
770 {
771 usb_unregister_notify(&usbfs_nb);
772 unregister_filesystem(&usb_fs_type);
773 if (usbdir)
774 remove_proc_entry("bus/usb", NULL);
775 }
776
Linux with added FPC-III support