aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/sbus/char/openprom.c
blob: 58ed33749571dde2078dd3bc28538bbc49be430c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
/*
 * Linux/SPARC PROM Configuration Driver
 * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
 * Copyright (C) 1996 Eddie C. Dost  (ecd@skynet.be)
 *
 * This character device driver allows user programs to access the
 * PROM device tree. It is compatible with the SunOS /dev/openprom
 * driver and the NetBSD /dev/openprom driver. The SunOS eeprom
 * utility works without any modifications.
 *
 * The driver uses a minor number under the misc device major. The
 * file read/write mode determines the type of access to the PROM.
 * Interrupts are disabled whenever the driver calls into the PROM for
 * sanity's sake.
 */

/* This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
 */

#define PROMLIB_INTERNAL

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/openpromio.h>
#ifdef CONFIG_PCI
#include <linux/pci.h>
#include <asm/pbm.h>
#endif

/* Private data kept by the driver for each descriptor. */
typedef struct openprom_private_data
{
	int current_node;	/* Current node for SunOS ioctls. */
	int lastnode;		/* Last valid node used by BSD ioctls. */
} DATA;

/* ID of the PROM node containing all of the EEPROM options. */
static int options_node = 0;

/*
 * Copy an openpromio structure into kernel space from user space.
 * This routine does error checking to make sure that all memory
 * accesses are within bounds. A pointer to the allocated openpromio
 * structure will be placed in "*opp_p". Return value is the length
 * of the user supplied buffer.
 */
static int copyin(struct openpromio __user *info, struct openpromio **opp_p)
{
	unsigned int bufsize;

	if (!info || !opp_p)
		return -EFAULT;

	if (get_user(bufsize, &info->oprom_size))
		return -EFAULT;

	if (bufsize == 0)
		return -EINVAL;

	/* If the bufsize is too large, just limit it.
	 * Fix from Jason Rappleye.
	 */
	if (bufsize > OPROMMAXPARAM)
		bufsize = OPROMMAXPARAM;

	if (!(*opp_p = kmalloc(sizeof(int) + bufsize + 1, GFP_KERNEL)))
		return -ENOMEM;
	memset(*opp_p, 0, sizeof(int) + bufsize + 1);

	if (copy_from_user(&(*opp_p)->oprom_array,
			   &info->oprom_array, bufsize)) {
		kfree(*opp_p);
		return -EFAULT;
	}
	return bufsize;
}

static int getstrings(struct openpromio __user *info, struct openpromio **opp_p)
{
	int n, bufsize;
	char c;

	if (!info || !opp_p)
		return -EFAULT;

	if (!(*opp_p = kmalloc(sizeof(int) + OPROMMAXPARAM + 1, GFP_KERNEL)))
		return -ENOMEM;

	memset(*opp_p, 0, sizeof(int) + OPROMMAXPARAM + 1);
	(*opp_p)->oprom_size = 0;

	n = bufsize = 0;
	while ((n < 2) && (bufsize < OPROMMAXPARAM)) {
		if (get_user(c, &info->oprom_array[bufsize])) {
			kfree(*opp_p);
			return -EFAULT;
		}
		if (c == '\0')
			n++;
		(*opp_p)->oprom_array[bufsize++] = c;
	}
	if (!n) {
		kfree(*opp_p);
		return -EINVAL;
	}
	return bufsize;
}

/*
 * Copy an openpromio structure in kernel space back to user space.
 */
static int copyout(void __user *info, struct openpromio *opp, int len)
{
	if (copy_to_user(info, opp, len))
		return -EFAULT;
	return 0;
}

/*
 *	SunOS and Solaris /dev/openprom ioctl calls.
 */
static int openprom_sunos_ioctl(struct inode * inode, struct file * file,
				unsigned int cmd, unsigned long arg, int node)
{
	DATA *data = (DATA *) file->private_data;
	char buffer[OPROMMAXPARAM+1], *buf;
	struct openpromio *opp;
	int bufsize, len, error = 0;
	static int cnt;
	void __user *argp = (void __user *)arg;

	if (cmd == OPROMSETOPT)
		bufsize = getstrings(argp, &opp);
	else
		bufsize = copyin(argp, &opp);

	if (bufsize < 0)
		return bufsize;

	switch (cmd) {
	case OPROMGETOPT:
	case OPROMGETPROP:
		len = prom_getproplen(node, opp->oprom_array);

		if (len <= 0 || len > bufsize) {
			error = copyout(argp, opp, sizeof(int));
			break;
		}

		len = prom_getproperty(node, opp->oprom_array, buffer, bufsize);

		memcpy(opp->oprom_array, buffer, len);
		opp->oprom_array[len] = '\0';
		opp->oprom_size = len;

		error = copyout(argp, opp, sizeof(int) + bufsize);
		break;

	case OPROMNXTOPT:
	case OPROMNXTPROP:
		buf = prom_nextprop(node, opp->oprom_array, buffer);

		len = strlen(buf);
		if (len == 0 || len + 1 > bufsize) {
			error = copyout(argp, opp, sizeof(int));
			break;
		}

		memcpy(opp->oprom_array, buf, len);
		opp->oprom_array[len] = '\0';
		opp->oprom_size = ++len;

		error = copyout(argp, opp, sizeof(int) + bufsize);
		break;

	case OPROMSETOPT:
	case OPROMSETOPT2:
		buf = opp->oprom_array + strlen(opp->oprom_array) + 1;
		len = opp->oprom_array + bufsize - buf;

		error = prom_setprop(options_node, opp->oprom_array,
				     buf, len);

		if (error < 0)
			error = -EINVAL;
		break;

	case OPROMNEXT:
	case OPROMCHILD:
	case OPROMSETCUR:
		if (bufsize < sizeof(int)) {
			error = -EINVAL;
			break;
		}

		node = *((int *) opp->oprom_array);

		switch (cmd) {
		case OPROMNEXT: node = __prom_getsibling(node); break;
		case OPROMCHILD: node = __prom_getchild(node); break;
		case OPROMSETCUR: break;
		}

		data->current_node = node;
		*((int *)opp->oprom_array) = node;
		opp->oprom_size = sizeof(int);

		error = copyout(argp, opp, bufsize + sizeof(int));
		break;

	case OPROMPCI2NODE:
		error = -EINVAL;

		if (bufsize >= 2*sizeof(int)) {
#ifdef CONFIG_PCI
			struct pci_dev *pdev;
			struct pcidev_cookie *pcp;
			pdev = pci_find_slot (((int *) opp->oprom_array)[0],
					      ((int *) opp->oprom_array)[1]);

			pcp = pdev->sysdata;
			if (pcp != NULL && pcp->prom_node != -1 && pcp->prom_node) {
				node = pcp->prom_node;
				data->current_node = node;
				*((int *)opp->oprom_array) = node;
				opp->oprom_size = sizeof(int);
				error = copyout(argp, opp, bufsize + sizeof(int));
			}
#endif
		}
		break;

	case OPROMPATH2NODE:
		node = prom_finddevice(opp->oprom_array);
		data->current_node = node;
		*((int *)opp->oprom_array) = node;
		opp->oprom_size = sizeof(int);

		error = copyout(argp, opp, bufsize + sizeof(int));
		break;

	case OPROMGETBOOTARGS:
		buf = saved_command_line;

		len = strlen(buf);

		if (len > bufsize) {
			error = -EINVAL;
			break;
		}

		strcpy(opp->oprom_array, buf);
		opp->oprom_size = len;

		error = copyout(argp, opp, bufsize + sizeof(int));
		break;

	case OPROMU2P:
	case OPROMGETCONS:
	case OPROMGETFBNAME:
		if (cnt++ < 10)
			printk(KERN_INFO "openprom_sunos_ioctl: unimplemented ioctl\n");
		error = -EINVAL;
		break;
	default:
		if (cnt++ < 10)
			printk(KERN_INFO "openprom_sunos_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
		error = -EINVAL;
		break;
	}

	kfree(opp);
	return error;
}


/* Return nonzero if a specific node is in the PROM device tree. */
static int intree(int root, int node)
{
	for (; root != 0; root = prom_getsibling(root))
		if (root == node || intree(prom_getchild(root),node))
			return 1;
	return 0;
}

/* Return nonzero if a specific node is "valid". */
static int goodnode(int n, DATA *data)
{
	if (n == data->lastnode || n == prom_root_node || n == options_node)
		return 1;
	if (n == 0 || n == -1 || !intree(prom_root_node,n))
		return 0;
	data->lastnode = n;
	return 1;
}

/* Copy in a whole string from userspace into kernelspace. */
static int copyin_string(char __user *user, size_t len, char **ptr)
{
	char *tmp;

	if ((ssize_t)len < 0 || (ssize_t)(len + 1) < 0)
		return -EINVAL;

	tmp = kmalloc(len + 1, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	if(copy_from_user(tmp, user, len)) {
		kfree(tmp);
		return -EFAULT;
	}

	tmp[len] = '\0';

	*ptr = tmp;

	return 0;
}

/*
 *	NetBSD /dev/openprom ioctl calls.
 */
static int openprom_bsd_ioctl(struct inode * inode, struct file * file,
			      unsigned int cmd, unsigned long arg)
{
	DATA *data = (DATA *) file->private_data;
	void __user *argp = (void __user *)arg;
	struct opiocdesc op;
	int error, node, len;
	char *str, *tmp;
	char buffer[64];
	static int cnt;

	switch (cmd) {
	case OPIOCGET:
		if (copy_from_user(&op, argp, sizeof(op)))
			return -EFAULT;

		if (!goodnode(op.op_nodeid,data))
			return -EINVAL;

		error = copyin_string(op.op_name, op.op_namelen, &str);
		if (error)
			return error;

		len = prom_getproplen(op.op_nodeid,str);

		if (len > op.op_buflen) {
			kfree(str);
			return -ENOMEM;
		}

		op.op_buflen = len;

		if (len <= 0) {
			kfree(str);
			/* Verified by the above copy_from_user */
			if (__copy_to_user(argp, &op,
				       sizeof(op)))
				return -EFAULT;
			return 0;
		}

		tmp = kmalloc(len + 1, GFP_KERNEL);
		if (!tmp) {
			kfree(str);
			return -ENOMEM;
		}

		prom_getproperty(op.op_nodeid, str, tmp, len);

		tmp[len] = '\0';

		if (__copy_to_user(argp, &op, sizeof(op)) != 0
		    || copy_to_user(op.op_buf, tmp, len) != 0)
			error = -EFAULT;

		kfree(tmp);
		kfree(str);

		return error;

	case OPIOCNEXTPROP:
		if (copy_from_user(&op, argp, sizeof(op)))
			return -EFAULT;

		if (!goodnode(op.op_nodeid,data))
			return -EINVAL;

		error = copyin_string(op.op_name, op.op_namelen, &str);
		if (error)
			return error;

		tmp = prom_nextprop(op.op_nodeid,str,buffer);

		if (tmp) {
			len = strlen(tmp);
			if (len > op.op_buflen)
				len = op.op_buflen;
			else
				op.op_buflen = len;
		} else {
			len = op.op_buflen = 0;
		}

		if (!access_ok(VERIFY_WRITE, argp, sizeof(op))) {
			kfree(str);
			return -EFAULT;
		}

		if (!access_ok(VERIFY_WRITE, op.op_buf, len)) {
			kfree(str);
			return -EFAULT;
		}

		error = __copy_to_user(argp, &op, sizeof(op));
		if (!error) error = __copy_to_user(op.op_buf, tmp, len);

		kfree(str);

		return error;

	case OPIOCSET:
		if (copy_from_user(&op, argp, sizeof(op)))
			return -EFAULT;

		if (!goodnode(op.op_nodeid,data))
			return -EINVAL;

		error = copyin_string(op.op_name, op.op_namelen, &str);
		if (error)
			return error;

		error = copyin_string(op.op_buf, op.op_buflen, &tmp);
		if (error) {
			kfree(str);
			return error;
		}

		len = prom_setprop(op.op_nodeid,str,tmp,op.op_buflen+1);

		if (len != op.op_buflen)
			return -EINVAL;

		kfree(str);
		kfree(tmp);

		return 0;

	case OPIOCGETOPTNODE:
		if (copy_to_user(argp, &options_node, sizeof(int)))
			return -EFAULT;
		return 0;

	case OPIOCGETNEXT:
	case OPIOCGETCHILD:
		if (copy_from_user(&node, argp, sizeof(int)))
			return -EFAULT;

		if (cmd == OPIOCGETNEXT)
			node = __prom_getsibling(node);
		else
			node = __prom_getchild(node);

		if (__copy_to_user(argp, &node, sizeof(int)))
			return -EFAULT;

		return 0;

	default:
		if (cnt++ < 10)
			printk(KERN_INFO "openprom_bsd_ioctl: cmd 0x%X\n", cmd);
		return -EINVAL;

	}
}


/*
 *	Handoff control to the correct ioctl handler.
 */
static int openprom_ioctl(struct inode * inode, struct file * file,
			  unsigned int cmd, unsigned long arg)
{
	DATA *data = (DATA *) file->private_data;
	static int cnt;

	switch (cmd) {
	case OPROMGETOPT:
	case OPROMNXTOPT:
		if ((file->f_mode & FMODE_READ) == 0)
			return -EPERM;
		return openprom_sunos_ioctl(inode, file, cmd, arg,
					    options_node);

	case OPROMSETOPT:
	case OPROMSETOPT2:
		if ((file->f_mode & FMODE_WRITE) == 0)
			return -EPERM;
		return openprom_sunos_ioctl(inode, file, cmd, arg,
					    options_node);

	case OPROMNEXT:
	case OPROMCHILD:
	case OPROMGETPROP:
	case OPROMNXTPROP:
		if ((file->f_mode & FMODE_READ) == 0)
			return -EPERM;
		return openprom_sunos_ioctl(inode, file, cmd, arg,
					    data->current_node);

	case OPROMU2P:
	case OPROMGETCONS:
	case OPROMGETFBNAME:
	case OPROMGETBOOTARGS:
	case OPROMSETCUR:
	case OPROMPCI2NODE:
	case OPROMPATH2NODE:
		if ((file->f_mode & FMODE_READ) == 0)
			return -EPERM;
		return openprom_sunos_ioctl(inode, file, cmd, arg, 0);

	case OPIOCGET:
	case OPIOCNEXTPROP:
	case OPIOCGETOPTNODE:
	case OPIOCGETNEXT:
	case OPIOCGETCHILD:
		if ((file->f_mode & FMODE_READ) == 0)
			return -EBADF;
		return openprom_bsd_ioctl(inode,file,cmd,arg);

	case OPIOCSET:
		if ((file->f_mode & FMODE_WRITE) == 0)
			return -EBADF;
		return openprom_bsd_ioctl(inode,file,cmd,arg);

	default:
		if (cnt++ < 10)
			printk("openprom_ioctl: cmd 0x%X, arg 0x%lX\n", cmd, arg);
		return -EINVAL;
	}
}

static int openprom_open(struct inode * inode, struct file * file)
{
	DATA *data;

	data = (DATA *) kmalloc(sizeof(DATA), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->current_node = prom_root_node;
	data->lastnode = prom_root_node;
	file->private_data = (void *)data;

	return 0;
}

static int openprom_release(struct inode * inode, struct file * file)
{
	kfree(file->private_data);
	return 0;
}

static struct file_operations openprom_fops = {
	.owner =	THIS_MODULE,
	.llseek =	no_llseek,
	.ioctl =	openprom_ioctl,
	.open =		openprom_open,
	.release =	openprom_release,
};

static struct miscdevice openprom_dev = {
	SUN_OPENPROM_MINOR, "openprom", &openprom_fops
};

static int __init openprom_init(void)
{
	int error;

	error = misc_register(&openprom_dev);
	if (error) {
		printk(KERN_ERR "openprom: unable to get misc minor\n");
		return error;
	}

	options_node = prom_getchild(prom_root_node);
	options_node = prom_searchsiblings(options_node,"options");

	if (options_node == 0 || options_node == -1) {
		printk(KERN_ERR "openprom: unable to find options node\n");
		misc_deregister(&openprom_dev);
		return -EIO;
	}

	return 0;
}

static void __exit openprom_cleanup(void)
{
	misc_deregister(&openprom_dev);
}

module_init(openprom_init);
module_exit(openprom_cleanup);
MODULE_LICENSE("GPL");