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