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32#include <linux/module.h>
33#include <linux/kernel.h>
34#include <linux/errno.h>
35#include <linux/slab.h>
36#include <linux/string.h>
37#include <linux/miscdevice.h>
38#include <linux/init.h>
39#include <linux/fs.h>
40#include <asm/oplib.h>
41#include <asm/prom.h>
42#include <asm/system.h>
43#include <asm/uaccess.h>
44#include <asm/openpromio.h>
45#ifdef CONFIG_PCI
46#include <linux/pci.h>
47#endif
48
49MODULE_AUTHOR("Thomas K. Dyas (tdyas@noc.rutgers.edu) and Eddie C. Dost (ecd@skynet.be)");
50MODULE_DESCRIPTION("OPENPROM Configuration Driver");
51MODULE_LICENSE("GPL");
52MODULE_VERSION("1.0");
53
54
55typedef struct openprom_private_data
56{
57 struct device_node *current_node;
58 struct device_node *lastnode;
59} DATA;
60
61
62static struct device_node *options_node;
63
64
65
66
67
68
69
70
71static int copyin(struct openpromio __user *info, struct openpromio **opp_p)
72{
73 unsigned int bufsize;
74
75 if (!info || !opp_p)
76 return -EFAULT;
77
78 if (get_user(bufsize, &info->oprom_size))
79 return -EFAULT;
80
81 if (bufsize == 0)
82 return -EINVAL;
83
84
85
86
87 if (bufsize > OPROMMAXPARAM)
88 bufsize = OPROMMAXPARAM;
89
90 if (!(*opp_p = kzalloc(sizeof(int) + bufsize + 1, GFP_KERNEL)))
91 return -ENOMEM;
92
93 if (copy_from_user(&(*opp_p)->oprom_array,
94 &info->oprom_array, bufsize)) {
95 kfree(*opp_p);
96 return -EFAULT;
97 }
98 return bufsize;
99}
100
101static int getstrings(struct openpromio __user *info, struct openpromio **opp_p)
102{
103 int n, bufsize;
104 char c;
105
106 if (!info || !opp_p)
107 return -EFAULT;
108
109 if (!(*opp_p = kzalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL)))
110 return -ENOMEM;
111
112 (*opp_p)->oprom_size = 0;
113
114 n = bufsize = 0;
115 while ((n < 2) && (bufsize < OPROMMAXPARAM)) {
116 if (get_user(c, &info->oprom_array[bufsize])) {
117 kfree(*opp_p);
118 return -EFAULT;
119 }
120 if (c == '\0')
121 n++;
122 (*opp_p)->oprom_array[bufsize++] = c;
123 }
124 if (!n) {
125 kfree(*opp_p);
126 return -EINVAL;
127 }
128 return bufsize;
129}
130
131
132
133
134static int copyout(void __user *info, struct openpromio *opp, int len)
135{
136 if (copy_to_user(info, opp, len))
137 return -EFAULT;
138 return 0;
139}
140
141static int opromgetprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
142{
143 const void *pval;
144 int len;
145
146 if (!dp ||
147 !(pval = of_get_property(dp, op->oprom_array, &len)) ||
148 len <= 0 || len > bufsize)
149 return copyout(argp, op, sizeof(int));
150
151 memcpy(op->oprom_array, pval, len);
152 op->oprom_array[len] = '\0';
153 op->oprom_size = len;
154
155 return copyout(argp, op, sizeof(int) + bufsize);
156}
157
158static int opromnxtprop(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize)
159{
160 struct property *prop;
161 int len;
162
163 if (!dp)
164 return copyout(argp, op, sizeof(int));
165 if (op->oprom_array[0] == '\0') {
166 prop = dp->properties;
167 if (!prop)
168 return copyout(argp, op, sizeof(int));
169 len = strlen(prop->name);
170 } else {
171 prop = of_find_property(dp, op->oprom_array, NULL);
172
173 if (!prop ||
174 !prop->next ||
175 (len = strlen(prop->next->name)) + 1 > bufsize)
176 return copyout(argp, op, sizeof(int));
177
178 prop = prop->next;
179 }
180
181 memcpy(op->oprom_array, prop->name, len);
182 op->oprom_array[len] = '\0';
183 op->oprom_size = ++len;
184
185 return copyout(argp, op, sizeof(int) + bufsize);
186}
187
188static int opromsetopt(struct device_node *dp, struct openpromio *op, int bufsize)
189{
190 char *buf = op->oprom_array + strlen(op->oprom_array) + 1;
191 int len = op->oprom_array + bufsize - buf;
192
193 return of_set_property(options_node, op->oprom_array, buf, len);
194}
195
196static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
197{
198 phandle ph;
199
200 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
201
202 if (bufsize < sizeof(phandle))
203 return -EINVAL;
204
205 ph = *((int *) op->oprom_array);
206 if (ph) {
207 dp = of_find_node_by_phandle(ph);
208 if (!dp)
209 return -EINVAL;
210
211 switch (cmd) {
212 case OPROMNEXT:
213 dp = dp->sibling;
214 break;
215
216 case OPROMCHILD:
217 dp = dp->child;
218 break;
219
220 case OPROMSETCUR:
221 default:
222 break;
223 };
224 } else {
225
226 if (cmd != OPROMNEXT)
227 return -EINVAL;
228
229 dp = of_find_node_by_path("/");
230 }
231
232 ph = 0;
233 if (dp)
234 ph = dp->node;
235
236 data->current_node = dp;
237 *((int *) op->oprom_array) = ph;
238 op->oprom_size = sizeof(phandle);
239
240 return copyout(argp, op, bufsize + sizeof(int));
241}
242
243static int oprompci2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
244{
245 int err = -EINVAL;
246
247 if (bufsize >= 2*sizeof(int)) {
248#ifdef CONFIG_PCI
249 struct pci_dev *pdev;
250 struct device_node *dp;
251
252 pdev = pci_get_bus_and_slot (((int *) op->oprom_array)[0],
253 ((int *) op->oprom_array)[1]);
254
255 dp = pci_device_to_OF_node(pdev);
256 data->current_node = dp;
257 *((int *)op->oprom_array) = dp->node;
258 op->oprom_size = sizeof(int);
259 err = copyout(argp, op, bufsize + sizeof(int));
260
261 pci_dev_put(pdev);
262#endif
263 }
264
265 return err;
266}
267
268static int oprompath2node(void __user *argp, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
269{
270 phandle ph = 0;
271
272 dp = of_find_node_by_path(op->oprom_array);
273 if (dp)
274 ph = dp->node;
275 data->current_node = dp;
276 *((int *)op->oprom_array) = ph;
277 op->oprom_size = sizeof(int);
278
279 return copyout(argp, op, bufsize + sizeof(int));
280}
281
282static int opromgetbootargs(void __user *argp, struct openpromio *op, int bufsize)
283{
284 char *buf = saved_command_line;
285 int len = strlen(buf);
286
287 if (len > bufsize)
288 return -EINVAL;
289
290 strcpy(op->oprom_array, buf);
291 op->oprom_size = len;
292
293 return copyout(argp, op, bufsize + sizeof(int));
294}
295
296
297
298
299static int openprom_sunos_ioctl(struct inode * inode, struct file * file,
300 unsigned int cmd, unsigned long arg,
301 struct device_node *dp)
302{
303 DATA *data = file->private_data;
304 struct openpromio *opp;
305 int bufsize, error = 0;
306 static int cnt;
307 void __user *argp = (void __user *)arg;
308
309 if (cmd == OPROMSETOPT)
310 bufsize = getstrings(argp, &opp);
311 else
312 bufsize = copyin(argp, &opp);
313
314 if (bufsize < 0)
315 return bufsize;
316
317 switch (cmd) {
318 case OPROMGETOPT:
319 case OPROMGETPROP:
320 error = opromgetprop(argp, dp, opp, bufsize);
321 break;
322
323 case OPROMNXTOPT:
324 case OPROMNXTPROP:
325 error = opromnxtprop(argp, dp, opp, bufsize);
326 break;
327
328 case OPROMSETOPT:
329 case OPROMSETOPT2:
330 error = opromsetopt(dp, opp, bufsize);
331 break;
332
333 case OPROMNEXT:
334 case OPROMCHILD:
335 case OPROMSETCUR:
336 error = opromnext(argp, cmd, dp, opp, bufsize, data);
337 break;
338
339 case OPROMPCI2NODE:
340 error = oprompci2node(argp, dp, opp, bufsize, data);
341 break;
342
343 case OPROMPATH2NODE:
344 error = oprompath2node(argp, dp, opp, bufsize, data);
345 break;
346
347 case OPROMGETBOOTARGS:
348 error = opromgetbootargs(argp, opp, bufsize);
349 break;
350
351 case OPROMU2P:
352 case OPROMGETCONS:
353 case OPROMGETFBNAME:
354 if (cnt++ < 10)
355 printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
356 error = -EINVAL;
357 break;
358 default:
359 if (cnt++ < 10)
360 printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
361 error = -EINVAL;
362 break;
363 }
364
365 kfree(opp);
366 return error;
367}
368
369static struct device_node *get_node(phandle n, DATA *data)
370{
371 struct device_node *dp = of_find_node_by_phandle(n);
372
373 if (dp)
374 data->lastnode = dp;
375
376 return dp;
377}
378
379
380static int copyin_string(char __user *user, size_t len, char **ptr)
381{
382 char *tmp;
383
384 if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
385 return -EINVAL;
386
387 tmp = kmalloc(len + 1, GFP_KERNEL);
388 if (!tmp)
389 return -ENOMEM;
390
391 if (copy_from_user(tmp, user, len)) {
392 kfree(tmp);
393 return -EFAULT;
394 }
395
396 tmp[len] = '\0';
397
398 *ptr = tmp;
399
400 return 0;
401}
402
403
404
405
406static int opiocget(void __user *argp, DATA *data)
407{
408 struct opiocdesc op;
409 struct device_node *dp;
410 char *str;
411 const void *pval;
412 int err, len;
413
414 if (copy_from_user(&op, argp, sizeof(op)))
415 return -EFAULT;
416
417 dp = get_node(op.op_nodeid, data);
418
419 err = copyin_string(op.op_name, op.op_namelen, &str);
420 if (err)
421 return err;
422
423 pval = of_get_property(dp, str, &len);
424 err = 0;
425 if (!pval || len > op.op_buflen) {
426 err = -EINVAL;
427 } else {
428 op.op_buflen = len;
429 if (copy_to_user(argp, &op, sizeof(op)) ||
430 copy_to_user(op.op_buf, pval, len))
431 err = -EFAULT;
432 }
433 kfree(str);
434
435 return err;
436}
437
438static int opiocnextprop(void __user *argp, DATA *data)
439{
440 struct opiocdesc op;
441 struct device_node *dp;
442 struct property *prop;
443 char *str;
444 int err, len;
445
446 if (copy_from_user(&op, argp, sizeof(op)))
447 return -EFAULT;
448
449 dp = get_node(op.op_nodeid, data);
450 if (!dp)
451 return -EINVAL;
452
453 err = copyin_string(op.op_name, op.op_namelen, &str);
454 if (err)
455 return err;
456
457 if (str[0] == '\0') {
458 prop = dp->properties;
459 } else {
460 prop = of_find_property(dp, str, NULL);
461 if (prop)
462 prop = prop->next;
463 }
464 kfree(str);
465
466 if (!prop)
467 len = 0;
468 else
469 len = prop->length;
470
471 if (len > op.op_buflen)
472 len = op.op_buflen;
473
474 if (copy_to_user(argp, &op, sizeof(op)))
475 return -EFAULT;
476
477 if (len &&
478 copy_to_user(op.op_buf, prop->value, len))
479 return -EFAULT;
480
481 return 0;
482}
483
484static int opiocset(void __user *argp, DATA *data)
485{
486 struct opiocdesc op;
487 struct device_node *dp;
488 char *str, *tmp;
489 int err;
490
491 if (copy_from_user(&op, argp, sizeof(op)))
492 return -EFAULT;
493
494 dp = get_node(op.op_nodeid, data);
495 if (!dp)
496 return -EINVAL;
497
498 err = copyin_string(op.op_name, op.op_namelen, &str);
499 if (err)
500 return err;
501
502 err = copyin_string(op.op_buf, op.op_buflen, &tmp);
503 if (err) {
504 kfree(str);
505 return err;
506 }
507
508 err = of_set_property(dp, str, tmp, op.op_buflen);
509
510 kfree(str);
511 kfree(tmp);
512
513 return err;
514}
515
516static int opiocgetnext(unsigned int cmd, void __user *argp)
517{
518 struct device_node *dp;
519 phandle nd;
520
521 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
522
523 if (copy_from_user(&nd, argp, sizeof(phandle)))
524 return -EFAULT;
525
526 if (nd == 0) {
527 if (cmd != OPIOCGETNEXT)
528 return -EINVAL;
529 dp = of_find_node_by_path("/");
530 } else {
531 dp = of_find_node_by_phandle(nd);
532 nd = 0;
533 if (dp) {
534 if (cmd == OPIOCGETNEXT)
535 dp = dp->sibling;
536 else
537 dp = dp->child;
538 }
539 }
540 if (dp)
541 nd = dp->node;
542 if (copy_to_user(argp, &nd, sizeof(phandle)))
543 return -EFAULT;
544
545 return 0;
546}
547
548static int openprom_bsd_ioctl(struct inode * inode, struct file * file,
549 unsigned int cmd, unsigned long arg)
550{
551 DATA *data = (DATA *) file->private_data;
552 void __user *argp = (void __user *)arg;
553 int err;
554
555 switch (cmd) {
556 case OPIOCGET:
557 err = opiocget(argp, data);
558 break;
559
560 case OPIOCNEXTPROP:
561 err = opiocnextprop(argp, data);
562 break;
563
564 case OPIOCSET:
565 err = opiocset(argp, data);
566 break;
567
568 case OPIOCGETOPTNODE:
569 BUILD_BUG_ON(sizeof(phandle) != sizeof(int));
570
571 if (copy_to_user(argp, &options_node->node, sizeof(phandle)))
572 return -EFAULT;
573
574 return 0;
575
576 case OPIOCGETNEXT:
577 case OPIOCGETCHILD:
578 err = opiocgetnext(cmd, argp);
579 break;
580
581 default:
582 return -EINVAL;
583
584 };
585
586 return err;
587}
588
589
590
591
592
593static int openprom_ioctl(struct inode * inode, struct file * file,
594 unsigned int cmd, unsigned long arg)
595{
596 DATA *data = (DATA *) file->private_data;
597
598 switch (cmd) {
599 case OPROMGETOPT:
600 case OPROMNXTOPT:
601 if ((file->f_mode & FMODE_READ) == 0)
602 return -EPERM;
603 return openprom_sunos_ioctl(inode, file, cmd, arg,
604 options_node);
605
606 case OPROMSETOPT:
607 case OPROMSETOPT2:
608 if ((file->f_mode & FMODE_WRITE) == 0)
609 return -EPERM;
610 return openprom_sunos_ioctl(inode, file, cmd, arg,
611 options_node);
612
613 case OPROMNEXT:
614 case OPROMCHILD:
615 case OPROMGETPROP:
616 case OPROMNXTPROP:
617 if ((file->f_mode & FMODE_READ) == 0)
618 return -EPERM;
619 return openprom_sunos_ioctl(inode, file, cmd, arg,
620 data->current_node);
621
622 case OPROMU2P:
623 case OPROMGETCONS:
624 case OPROMGETFBNAME:
625 case OPROMGETBOOTARGS:
626 case OPROMSETCUR:
627 case OPROMPCI2NODE:
628 case OPROMPATH2NODE:
629 if ((file->f_mode & FMODE_READ) == 0)
630 return -EPERM;
631 return openprom_sunos_ioctl(inode, file, cmd, arg, NULL);
632
633 case OPIOCGET:
634 case OPIOCNEXTPROP:
635 case OPIOCGETOPTNODE:
636 case OPIOCGETNEXT:
637 case OPIOCGETCHILD:
638 if ((file->f_mode & FMODE_READ) == 0)
639 return -EBADF;
640 return openprom_bsd_ioctl(inode,file,cmd,arg);
641
642 case OPIOCSET:
643 if ((file->f_mode & FMODE_WRITE) == 0)
644 return -EBADF;
645 return openprom_bsd_ioctl(inode,file,cmd,arg);
646
647 default:
648 return -EINVAL;
649 };
650}
651
652static long openprom_compat_ioctl(struct file *file, unsigned int cmd,
653 unsigned long arg)
654{
655 long rval = -ENOTTY;
656
657
658
659
660
661 switch (cmd) {
662 case OPROMGETOPT:
663 case OPROMSETOPT:
664 case OPROMNXTOPT:
665 case OPROMSETOPT2:
666 case OPROMNEXT:
667 case OPROMCHILD:
668 case OPROMGETPROP:
669 case OPROMNXTPROP:
670 case OPROMU2P:
671 case OPROMGETCONS:
672 case OPROMGETFBNAME:
673 case OPROMGETBOOTARGS:
674 case OPROMSETCUR:
675 case OPROMPCI2NODE:
676 case OPROMPATH2NODE:
677 rval = openprom_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
678 break;
679 }
680
681 return rval;
682}
683
684static int openprom_open(struct inode * inode, struct file * file)
685{
686 DATA *data;
687
688 data = kmalloc(sizeof(DATA), GFP_KERNEL);
689 if (!data)
690 return -ENOMEM;
691
692 data->current_node = of_find_node_by_path("/");
693 data->lastnode = data->current_node;
694 file->private_data = (void *) data;
695
696 return 0;
697}
698
699static int openprom_release(struct inode * inode, struct file * file)
700{
701 kfree(file->private_data);
702 return 0;
703}
704
705static const struct file_operations openprom_fops = {
706 .owner = THIS_MODULE,
707 .llseek = no_llseek,
708 .ioctl = openprom_ioctl,
709 .compat_ioctl = openprom_compat_ioctl,
710 .open = openprom_open,
711 .release = openprom_release,
712};
713
714static struct miscdevice openprom_dev = {
715 .minor = SUN_OPENPROM_MINOR,
716 .name = "openprom",
717 .fops = &openprom_fops,
718};
719
720static int __init openprom_init(void)
721{
722 struct device_node *dp;
723 int err;
724
725 err = misc_register(&openprom_dev);
726 if (err)
727 return err;
728
729 dp = of_find_node_by_path("/");
730 dp = dp->child;
731 while (dp) {
732 if (!strcmp(dp->name, "options"))
733 break;
734 dp = dp->sibling;
735 }
736 options_node = dp;
737
738 if (!options_node) {
739 misc_deregister(&openprom_dev);
740 return -EIO;
741 }
742
743 return 0;
744}
745
746static void __exit openprom_cleanup(void)
747{
748 misc_deregister(&openprom_dev);
749}
750
751module_init(openprom_init);
752module_exit(openprom_cleanup);
753
