1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * cistpl.c -- 16-bit PCMCIA Card Information Structure parser
4 *
5 * The initial developer of the original code is David A. Hinds
6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
8 *
9 * (C) 1999 David A. Hinds
10 */
11
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
16 #include <linux/major.h>
17 #include <linux/errno.h>
18 #include <linux/timer.h>
19 #include <linux/slab.h>
20 #include <linux/mm.h>
21 #include <linux/pci.h>
22 #include <linux/ioport.h>
23 #include <linux/io.h>
24 #include <linux/security.h>
25 #include <asm/byteorder.h>
26 #include <asm/unaligned.h>
27
28 #include <pcmcia/ss.h>
29 #include <pcmcia/cisreg.h>
30 #include <pcmcia/cistpl.h>
31 #include <pcmcia/ds.h>
32 #include "cs_internal.h"
33
34 static const u_char mantissa[] = {
35 10, 12, 13, 15, 20, 25, 30, 35,
36 40, 45, 50, 55, 60, 70, 80, 90
37 };
38
39 static const u_int exponent[] = {
40 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
41 };
42
43 /* Convert an extended speed byte to a time in nanoseconds */
44 #define SPEED_CVT(v) \
45 (mantissa[(((v)>>3)&15)-1] * exponent[(v)&7] / 10)
46 /* Convert a power byte to a current in 0.1 microamps */
47 #define POWER_CVT(v) \
48 (mantissa[((v)>>3)&15] * exponent[(v)&7] / 10)
49 #define POWER_SCALE(v) (exponent[(v)&7])
50
51 /* Upper limit on reasonable # of tuples */
52 #define MAX_TUPLES 200
53
54 /* Bits in IRQInfo1 field */
55 #define IRQ_INFO2_VALID 0x10
56
57 /* 16-bit CIS? */
58 static int cis_width;
59 module_param(cis_width, int, 0444);
60
release_cis_mem(struct pcmcia_socket * s)61 void release_cis_mem(struct pcmcia_socket *s)
62 {
63 mutex_lock(&s->ops_mutex);
64 if (s->cis_mem.flags & MAP_ACTIVE) {
65 s->cis_mem.flags &= ~MAP_ACTIVE;
66 s->ops->set_mem_map(s, &s->cis_mem);
67 if (s->cis_mem.res) {
68 release_resource(s->cis_mem.res);
69 kfree(s->cis_mem.res);
70 s->cis_mem.res = NULL;
71 }
72 iounmap(s->cis_virt);
73 s->cis_virt = NULL;
74 }
75 mutex_unlock(&s->ops_mutex);
76 }
77
78 /**
79 * set_cis_map() - map the card memory at "card_offset" into virtual space.
80 *
81 * If flags & MAP_ATTRIB, map the attribute space, otherwise
82 * map the memory space.
83 *
84 * Must be called with ops_mutex held.
85 */
set_cis_map(struct pcmcia_socket * s,unsigned int card_offset,unsigned int flags)86 static void __iomem *set_cis_map(struct pcmcia_socket *s,
87 unsigned int card_offset, unsigned int flags)
88 {
89 pccard_mem_map *mem = &s->cis_mem;
90 int ret;
91
92 if (!(s->features & SS_CAP_STATIC_MAP) && (mem->res == NULL)) {
93 mem->res = pcmcia_find_mem_region(0, s->map_size,
94 s->map_size, 0, s);
95 if (mem->res == NULL) {
96 dev_notice(&s->dev, "cs: unable to map card memory!\n");
97 return NULL;
98 }
99 s->cis_virt = NULL;
100 }
101
102 if (!(s->features & SS_CAP_STATIC_MAP) && (!s->cis_virt))
103 s->cis_virt = ioremap(mem->res->start, s->map_size);
104
105 mem->card_start = card_offset;
106 mem->flags = flags;
107
108 ret = s->ops->set_mem_map(s, mem);
109 if (ret) {
110 iounmap(s->cis_virt);
111 s->cis_virt = NULL;
112 return NULL;
113 }
114
115 if (s->features & SS_CAP_STATIC_MAP) {
116 if (s->cis_virt)
117 iounmap(s->cis_virt);
118 s->cis_virt = ioremap(mem->static_start, s->map_size);
119 }
120
121 return s->cis_virt;
122 }
123
124
125 /* Bits in attr field */
126 #define IS_ATTR 1
127 #define IS_INDIRECT 8
128
129 /**
130 * pcmcia_read_cis_mem() - low-level function to read CIS memory
131 *
132 * must be called with ops_mutex held
133 */
pcmcia_read_cis_mem(struct pcmcia_socket * s,int attr,u_int addr,u_int len,void * ptr)134 int pcmcia_read_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
135 u_int len, void *ptr)
136 {
137 void __iomem *sys, *end;
138 unsigned char *buf = ptr;
139
140 dev_dbg(&s->dev, "pcmcia_read_cis_mem(%d, %#x, %u)\n", attr, addr, len);
141
142 if (attr & IS_INDIRECT) {
143 /* Indirect accesses use a bunch of special registers at fixed
144 locations in common memory */
145 u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
146 if (attr & IS_ATTR) {
147 addr *= 2;
148 flags = ICTRL0_AUTOINC;
149 }
150
151 sys = set_cis_map(s, 0, MAP_ACTIVE |
152 ((cis_width) ? MAP_16BIT : 0));
153 if (!sys) {
154 dev_dbg(&s->dev, "could not map memory\n");
155 memset(ptr, 0xff, len);
156 return -1;
157 }
158
159 writeb(flags, sys+CISREG_ICTRL0);
160 writeb(addr & 0xff, sys+CISREG_IADDR0);
161 writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
162 writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
163 writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
164 for ( ; len > 0; len--, buf++)
165 *buf = readb(sys+CISREG_IDATA0);
166 } else {
167 u_int inc = 1, card_offset, flags;
168
169 if (addr > CISTPL_MAX_CIS_SIZE) {
170 dev_dbg(&s->dev,
171 "attempt to read CIS mem at addr %#x", addr);
172 memset(ptr, 0xff, len);
173 return -1;
174 }
175
176 flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
177 if (attr) {
178 flags |= MAP_ATTRIB;
179 inc++;
180 addr *= 2;
181 }
182
183 card_offset = addr & ~(s->map_size-1);
184 while (len) {
185 sys = set_cis_map(s, card_offset, flags);
186 if (!sys) {
187 dev_dbg(&s->dev, "could not map memory\n");
188 memset(ptr, 0xff, len);
189 return -1;
190 }
191 end = sys + s->map_size;
192 sys = sys + (addr & (s->map_size-1));
193 for ( ; len > 0; len--, buf++, sys += inc) {
194 if (sys == end)
195 break;
196 *buf = readb(sys);
197 }
198 card_offset += s->map_size;
199 addr = 0;
200 }
201 }
202 dev_dbg(&s->dev, " %#2.2x %#2.2x %#2.2x %#2.2x ...\n",
203 *(u_char *)(ptr+0), *(u_char *)(ptr+1),
204 *(u_char *)(ptr+2), *(u_char *)(ptr+3));
205 return 0;
206 }
207
208
209 /**
210 * pcmcia_write_cis_mem() - low-level function to write CIS memory
211 *
212 * Probably only useful for writing one-byte registers. Must be called
213 * with ops_mutex held.
214 */
pcmcia_write_cis_mem(struct pcmcia_socket * s,int attr,u_int addr,u_int len,void * ptr)215 int pcmcia_write_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
216 u_int len, void *ptr)
217 {
218 void __iomem *sys, *end;
219 unsigned char *buf = ptr;
220
221 dev_dbg(&s->dev,
222 "pcmcia_write_cis_mem(%d, %#x, %u)\n", attr, addr, len);
223
224 if (attr & IS_INDIRECT) {
225 /* Indirect accesses use a bunch of special registers at fixed
226 locations in common memory */
227 u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
228 if (attr & IS_ATTR) {
229 addr *= 2;
230 flags = ICTRL0_AUTOINC;
231 }
232
233 sys = set_cis_map(s, 0, MAP_ACTIVE |
234 ((cis_width) ? MAP_16BIT : 0));
235 if (!sys) {
236 dev_dbg(&s->dev, "could not map memory\n");
237 return -EINVAL;
238 }
239
240 writeb(flags, sys+CISREG_ICTRL0);
241 writeb(addr & 0xff, sys+CISREG_IADDR0);
242 writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
243 writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
244 writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
245 for ( ; len > 0; len--, buf++)
246 writeb(*buf, sys+CISREG_IDATA0);
247 } else {
248 u_int inc = 1, card_offset, flags;
249
250 flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
251 if (attr & IS_ATTR) {
252 flags |= MAP_ATTRIB;
253 inc++;
254 addr *= 2;
255 }
256
257 card_offset = addr & ~(s->map_size-1);
258 while (len) {
259 sys = set_cis_map(s, card_offset, flags);
260 if (!sys) {
261 dev_dbg(&s->dev, "could not map memory\n");
262 return -EINVAL;
263 }
264
265 end = sys + s->map_size;
266 sys = sys + (addr & (s->map_size-1));
267 for ( ; len > 0; len--, buf++, sys += inc) {
268 if (sys == end)
269 break;
270 writeb(*buf, sys);
271 }
272 card_offset += s->map_size;
273 addr = 0;
274 }
275 }
276 return 0;
277 }
278
279
280 /**
281 * read_cis_cache() - read CIS memory or its associated cache
282 *
283 * This is a wrapper around read_cis_mem, with the same interface,
284 * but which caches information, for cards whose CIS may not be
285 * readable all the time.
286 */
read_cis_cache(struct pcmcia_socket * s,int attr,u_int addr,size_t len,void * ptr)287 static int read_cis_cache(struct pcmcia_socket *s, int attr, u_int addr,
288 size_t len, void *ptr)
289 {
290 struct cis_cache_entry *cis;
291 int ret = 0;
292
293 if (s->state & SOCKET_CARDBUS)
294 return -EINVAL;
295
296 mutex_lock(&s->ops_mutex);
297 if (s->fake_cis) {
298 if (s->fake_cis_len >= addr+len)
299 memcpy(ptr, s->fake_cis+addr, len);
300 else {
301 memset(ptr, 0xff, len);
302 ret = -EINVAL;
303 }
304 mutex_unlock(&s->ops_mutex);
305 return ret;
306 }
307
308 list_for_each_entry(cis, &s->cis_cache, node) {
309 if (cis->addr == addr && cis->len == len && cis->attr == attr) {
310 memcpy(ptr, cis->cache, len);
311 mutex_unlock(&s->ops_mutex);
312 return 0;
313 }
314 }
315
316 ret = pcmcia_read_cis_mem(s, attr, addr, len, ptr);
317
318 if (ret == 0) {
319 /* Copy data into the cache */
320 cis = kmalloc(sizeof(struct cis_cache_entry) + len, GFP_KERNEL);
321 if (cis) {
322 cis->addr = addr;
323 cis->len = len;
324 cis->attr = attr;
325 memcpy(cis->cache, ptr, len);
326 list_add(&cis->node, &s->cis_cache);
327 }
328 }
329 mutex_unlock(&s->ops_mutex);
330
331 return ret;
332 }
333
334 static void
remove_cis_cache(struct pcmcia_socket * s,int attr,u_int addr,u_int len)335 remove_cis_cache(struct pcmcia_socket *s, int attr, u_int addr, u_int len)
336 {
337 struct cis_cache_entry *cis;
338
339 mutex_lock(&s->ops_mutex);
340 list_for_each_entry(cis, &s->cis_cache, node)
341 if (cis->addr == addr && cis->len == len && cis->attr == attr) {
342 list_del(&cis->node);
343 kfree(cis);
344 break;
345 }
346 mutex_unlock(&s->ops_mutex);
347 }
348
349 /**
350 * destroy_cis_cache() - destroy the CIS cache
351 * @s: pcmcia_socket for which CIS cache shall be destroyed
352 *
353 * This destroys the CIS cache but keeps any fake CIS alive. Must be
354 * called with ops_mutex held.
355 */
destroy_cis_cache(struct pcmcia_socket * s)356 void destroy_cis_cache(struct pcmcia_socket *s)
357 {
358 struct list_head *l, *n;
359 struct cis_cache_entry *cis;
360
361 list_for_each_safe(l, n, &s->cis_cache) {
362 cis = list_entry(l, struct cis_cache_entry, node);
363 list_del(&cis->node);
364 kfree(cis);
365 }
366 }
367
368 /**
369 * verify_cis_cache() - does the CIS match what is in the CIS cache?
370 */
verify_cis_cache(struct pcmcia_socket * s)371 int verify_cis_cache(struct pcmcia_socket *s)
372 {
373 struct cis_cache_entry *cis;
374 char *buf;
375 int ret;
376
377 if (s->state & SOCKET_CARDBUS)
378 return -EINVAL;
379
380 buf = kmalloc(256, GFP_KERNEL);
381 if (buf == NULL) {
382 dev_warn(&s->dev, "no memory for verifying CIS\n");
383 return -ENOMEM;
384 }
385 mutex_lock(&s->ops_mutex);
386 list_for_each_entry(cis, &s->cis_cache, node) {
387 int len = cis->len;
388
389 if (len > 256)
390 len = 256;
391
392 ret = pcmcia_read_cis_mem(s, cis->attr, cis->addr, len, buf);
393 if (ret || memcmp(buf, cis->cache, len) != 0) {
394 kfree(buf);
395 mutex_unlock(&s->ops_mutex);
396 return -1;
397 }
398 }
399 kfree(buf);
400 mutex_unlock(&s->ops_mutex);
401 return 0;
402 }
403
404 /**
405 * pcmcia_replace_cis() - use a replacement CIS instead of the card's CIS
406 *
407 * For really bad cards, we provide a facility for uploading a
408 * replacement CIS.
409 */
pcmcia_replace_cis(struct pcmcia_socket * s,const u8 * data,const size_t len)410 int pcmcia_replace_cis(struct pcmcia_socket *s,
411 const u8 *data, const size_t len)
412 {
413 if (len > CISTPL_MAX_CIS_SIZE) {
414 dev_warn(&s->dev, "replacement CIS too big\n");
415 return -EINVAL;
416 }
417 mutex_lock(&s->ops_mutex);
418 kfree(s->fake_cis);
419 s->fake_cis = kmalloc(len, GFP_KERNEL);
420 if (s->fake_cis == NULL) {
421 dev_warn(&s->dev, "no memory to replace CIS\n");
422 mutex_unlock(&s->ops_mutex);
423 return -ENOMEM;
424 }
425 s->fake_cis_len = len;
426 memcpy(s->fake_cis, data, len);
427 dev_info(&s->dev, "Using replacement CIS\n");
428 mutex_unlock(&s->ops_mutex);
429 return 0;
430 }
431
432 /* The high-level CIS tuple services */
433
434 struct tuple_flags {
435 u_int link_space:4;
436 u_int has_link:1;
437 u_int mfc_fn:3;
438 u_int space:4;
439 };
440
441 #define LINK_SPACE(f) (((struct tuple_flags *)(&(f)))->link_space)
442 #define HAS_LINK(f) (((struct tuple_flags *)(&(f)))->has_link)
443 #define MFC_FN(f) (((struct tuple_flags *)(&(f)))->mfc_fn)
444 #define SPACE(f) (((struct tuple_flags *)(&(f)))->space)
445
pccard_get_first_tuple(struct pcmcia_socket * s,unsigned int function,tuple_t * tuple)446 int pccard_get_first_tuple(struct pcmcia_socket *s, unsigned int function,
447 tuple_t *tuple)
448 {
449 if (!s)
450 return -EINVAL;
451
452 if (!(s->state & SOCKET_PRESENT) || (s->state & SOCKET_CARDBUS))
453 return -ENODEV;
454 tuple->TupleLink = tuple->Flags = 0;
455
456 /* Assume presence of a LONGLINK_C to address 0 */
457 tuple->CISOffset = tuple->LinkOffset = 0;
458 SPACE(tuple->Flags) = HAS_LINK(tuple->Flags) = 1;
459
460 if ((s->functions > 1) && !(tuple->Attributes & TUPLE_RETURN_COMMON)) {
461 cisdata_t req = tuple->DesiredTuple;
462 tuple->DesiredTuple = CISTPL_LONGLINK_MFC;
463 if (pccard_get_next_tuple(s, function, tuple) == 0) {
464 tuple->DesiredTuple = CISTPL_LINKTARGET;
465 if (pccard_get_next_tuple(s, function, tuple) != 0)
466 return -ENOSPC;
467 } else
468 tuple->CISOffset = tuple->TupleLink = 0;
469 tuple->DesiredTuple = req;
470 }
471 return pccard_get_next_tuple(s, function, tuple);
472 }
473
follow_link(struct pcmcia_socket * s,tuple_t * tuple)474 static int follow_link(struct pcmcia_socket *s, tuple_t *tuple)
475 {
476 u_char link[5];
477 u_int ofs;
478 int ret;
479
480 if (MFC_FN(tuple->Flags)) {
481 /* Get indirect link from the MFC tuple */
482 ret = read_cis_cache(s, LINK_SPACE(tuple->Flags),
483 tuple->LinkOffset, 5, link);
484 if (ret)
485 return -1;
486 ofs = get_unaligned_le32(link + 1);
487 SPACE(tuple->Flags) = (link[0] == CISTPL_MFC_ATTR);
488 /* Move to the next indirect link */
489 tuple->LinkOffset += 5;
490 MFC_FN(tuple->Flags)--;
491 } else if (HAS_LINK(tuple->Flags)) {
492 ofs = tuple->LinkOffset;
493 SPACE(tuple->Flags) = LINK_SPACE(tuple->Flags);
494 HAS_LINK(tuple->Flags) = 0;
495 } else
496 return -1;
497
498 if (SPACE(tuple->Flags)) {
499 /* This is ugly, but a common CIS error is to code the long
500 link offset incorrectly, so we check the right spot... */
501 ret = read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
502 if (ret)
503 return -1;
504 if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
505 (strncmp(link+2, "CIS", 3) == 0))
506 return ofs;
507 remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
508 /* Then, we try the wrong spot... */
509 ofs = ofs >> 1;
510 }
511 ret = read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
512 if (ret)
513 return -1;
514 if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
515 (strncmp(link+2, "CIS", 3) == 0))
516 return ofs;
517 remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
518 return -1;
519 }
520
pccard_get_next_tuple(struct pcmcia_socket * s,unsigned int function,tuple_t * tuple)521 int pccard_get_next_tuple(struct pcmcia_socket *s, unsigned int function,
522 tuple_t *tuple)
523 {
524 u_char link[2], tmp;
525 int ofs, i, attr;
526 int ret;
527
528 if (!s)
529 return -EINVAL;
530 if (!(s->state & SOCKET_PRESENT) || (s->state & SOCKET_CARDBUS))
531 return -ENODEV;
532
533 link[1] = tuple->TupleLink;
534 ofs = tuple->CISOffset + tuple->TupleLink;
535 attr = SPACE(tuple->Flags);
536
537 for (i = 0; i < MAX_TUPLES; i++) {
538 if (link[1] == 0xff)
539 link[0] = CISTPL_END;
540 else {
541 ret = read_cis_cache(s, attr, ofs, 2, link);
542 if (ret)
543 return -1;
544 if (link[0] == CISTPL_NULL) {
545 ofs++;
546 continue;
547 }
548 }
549
550 /* End of chain? Follow long link if possible */
551 if (link[0] == CISTPL_END) {
552 ofs = follow_link(s, tuple);
553 if (ofs < 0)
554 return -ENOSPC;
555 attr = SPACE(tuple->Flags);
556 ret = read_cis_cache(s, attr, ofs, 2, link);
557 if (ret)
558 return -1;
559 }
560
561 /* Is this a link tuple? Make a note of it */
562 if ((link[0] == CISTPL_LONGLINK_A) ||
563 (link[0] == CISTPL_LONGLINK_C) ||
564 (link[0] == CISTPL_LONGLINK_MFC) ||
565 (link[0] == CISTPL_LINKTARGET) ||
566 (link[0] == CISTPL_INDIRECT) ||
567 (link[0] == CISTPL_NO_LINK)) {
568 switch (link[0]) {
569 case CISTPL_LONGLINK_A:
570 HAS_LINK(tuple->Flags) = 1;
571 LINK_SPACE(tuple->Flags) = attr | IS_ATTR;
572 ret = read_cis_cache(s, attr, ofs+2, 4,
573 &tuple->LinkOffset);
574 if (ret)
575 return -1;
576 break;
577 case CISTPL_LONGLINK_C:
578 HAS_LINK(tuple->Flags) = 1;
579 LINK_SPACE(tuple->Flags) = attr & ~IS_ATTR;
580 ret = read_cis_cache(s, attr, ofs+2, 4,
581 &tuple->LinkOffset);
582 if (ret)
583 return -1;
584 break;
585 case CISTPL_INDIRECT:
586 HAS_LINK(tuple->Flags) = 1;
587 LINK_SPACE(tuple->Flags) = IS_ATTR |
588 IS_INDIRECT;
589 tuple->LinkOffset = 0;
590 break;
591 case CISTPL_LONGLINK_MFC:
592 tuple->LinkOffset = ofs + 3;
593 LINK_SPACE(tuple->Flags) = attr;
594 if (function == BIND_FN_ALL) {
595 /* Follow all the MFC links */
596 ret = read_cis_cache(s, attr, ofs+2,
597 1, &tmp);
598 if (ret)
599 return -1;
600 MFC_FN(tuple->Flags) = tmp;
601 } else {
602 /* Follow exactly one of the links */
603 MFC_FN(tuple->Flags) = 1;
604 tuple->LinkOffset += function * 5;
605 }
606 break;
607 case CISTPL_NO_LINK:
608 HAS_LINK(tuple->Flags) = 0;
609 break;
610 }
611 if ((tuple->Attributes & TUPLE_RETURN_LINK) &&
612 (tuple->DesiredTuple == RETURN_FIRST_TUPLE))
613 break;
614 } else
615 if (tuple->DesiredTuple == RETURN_FIRST_TUPLE)
616 break;
617
618 if (link[0] == tuple->DesiredTuple)
619 break;
620 ofs += link[1] + 2;
621 }
622 if (i == MAX_TUPLES) {
623 dev_dbg(&s->dev, "cs: overrun in pcmcia_get_next_tuple\n");
624 return -ENOSPC;
625 }
626
627 tuple->TupleCode = link[0];
628 tuple->TupleLink = link[1];
629 tuple->CISOffset = ofs + 2;
630 return 0;
631 }
632
pccard_get_tuple_data(struct pcmcia_socket * s,tuple_t * tuple)633 int pccard_get_tuple_data(struct pcmcia_socket *s, tuple_t *tuple)
634 {
635 u_int len;
636 int ret;
637
638 if (!s)
639 return -EINVAL;
640
641 if (tuple->TupleLink < tuple->TupleOffset)
642 return -ENOSPC;
643 len = tuple->TupleLink - tuple->TupleOffset;
644 tuple->TupleDataLen = tuple->TupleLink;
645 if (len == 0)
646 return 0;
647 ret = read_cis_cache(s, SPACE(tuple->Flags),
648 tuple->CISOffset + tuple->TupleOffset,
649 min(len, (u_int) tuple->TupleDataMax),
650 tuple->TupleData);
651 if (ret)
652 return -1;
653 return 0;
654 }
655
656
657 /* Parsing routines for individual tuples */
658
parse_device(tuple_t * tuple,cistpl_device_t * device)659 static int parse_device(tuple_t *tuple, cistpl_device_t *device)
660 {
661 int i;
662 u_char scale;
663 u_char *p, *q;
664
665 p = (u_char *)tuple->TupleData;
666 q = p + tuple->TupleDataLen;
667
668 device->ndev = 0;
669 for (i = 0; i < CISTPL_MAX_DEVICES; i++) {
670
671 if (*p == 0xff)
672 break;
673 device->dev[i].type = (*p >> 4);
674 device->dev[i].wp = (*p & 0x08) ? 1 : 0;
675 switch (*p & 0x07) {
676 case 0:
677 device->dev[i].speed = 0;
678 break;
679 case 1:
680 device->dev[i].speed = 250;
681 break;
682 case 2:
683 device->dev[i].speed = 200;
684 break;
685 case 3:
686 device->dev[i].speed = 150;
687 break;
688 case 4:
689 device->dev[i].speed = 100;
690 break;
691 case 7:
692 if (++p == q)
693 return -EINVAL;
694 device->dev[i].speed = SPEED_CVT(*p);
695 while (*p & 0x80)
696 if (++p == q)
697 return -EINVAL;
698 break;
699 default:
700 return -EINVAL;
701 }
702
703 if (++p == q)
704 return -EINVAL;
705 if (*p == 0xff)
706 break;
707 scale = *p & 7;
708 if (scale == 7)
709 return -EINVAL;
710 device->dev[i].size = ((*p >> 3) + 1) * (512 << (scale*2));
711 device->ndev++;
712 if (++p == q)
713 break;
714 }
715
716 return 0;
717 }
718
719
parse_checksum(tuple_t * tuple,cistpl_checksum_t * csum)720 static int parse_checksum(tuple_t *tuple, cistpl_checksum_t *csum)
721 {
722 u_char *p;
723 if (tuple->TupleDataLen < 5)
724 return -EINVAL;
725 p = (u_char *) tuple->TupleData;
726 csum->addr = tuple->CISOffset + get_unaligned_le16(p) - 2;
727 csum->len = get_unaligned_le16(p + 2);
728 csum->sum = *(p + 4);
729 return 0;
730 }
731
732
parse_longlink(tuple_t * tuple,cistpl_longlink_t * link)733 static int parse_longlink(tuple_t *tuple, cistpl_longlink_t *link)
734 {
735 if (tuple->TupleDataLen < 4)
736 return -EINVAL;
737 link->addr = get_unaligned_le32(tuple->TupleData);
738 return 0;
739 }
740
741
parse_longlink_mfc(tuple_t * tuple,cistpl_longlink_mfc_t * link)742 static int parse_longlink_mfc(tuple_t *tuple, cistpl_longlink_mfc_t *link)
743 {
744 u_char *p;
745 int i;
746
747 p = (u_char *)tuple->TupleData;
748
749 link->nfn = *p; p++;
750 if (tuple->TupleDataLen <= link->nfn*5)
751 return -EINVAL;
752 for (i = 0; i < link->nfn; i++) {
753 link->fn[i].space = *p; p++;
754 link->fn[i].addr = get_unaligned_le32(p);
755 p += 4;
756 }
757 return 0;
758 }
759
760
parse_strings(u_char * p,u_char * q,int max,char * s,u_char * ofs,u_char * found)761 static int parse_strings(u_char *p, u_char *q, int max,
762 char *s, u_char *ofs, u_char *found)
763 {
764 int i, j, ns;
765
766 if (p == q)
767 return -EINVAL;
768 ns = 0; j = 0;
769 for (i = 0; i < max; i++) {
770 if (*p == 0xff)
771 break;
772 ofs[i] = j;
773 ns++;
774 for (;;) {
775 s[j++] = (*p == 0xff) ? '\0' : *p;
776 if ((*p == '\0') || (*p == 0xff))
777 break;
778 if (++p == q)
779 return -EINVAL;
780 }
781 if ((*p == 0xff) || (++p == q))
782 break;
783 }
784 if (found) {
785 *found = ns;
786 return 0;
787 }
788
789 return (ns == max) ? 0 : -EINVAL;
790 }
791
792
parse_vers_1(tuple_t * tuple,cistpl_vers_1_t * vers_1)793 static int parse_vers_1(tuple_t *tuple, cistpl_vers_1_t *vers_1)
794 {
795 u_char *p, *q;
796
797 p = (u_char *)tuple->TupleData;
798 q = p + tuple->TupleDataLen;
799
800 vers_1->major = *p; p++;
801 vers_1->minor = *p; p++;
802 if (p >= q)
803 return -EINVAL;
804
805 return parse_strings(p, q, CISTPL_VERS_1_MAX_PROD_STRINGS,
806 vers_1->str, vers_1->ofs, &vers_1->ns);
807 }
808
809
parse_altstr(tuple_t * tuple,cistpl_altstr_t * altstr)810 static int parse_altstr(tuple_t *tuple, cistpl_altstr_t *altstr)
811 {
812 u_char *p, *q;
813
814 p = (u_char *)tuple->TupleData;
815 q = p + tuple->TupleDataLen;
816
817 return parse_strings(p, q, CISTPL_MAX_ALTSTR_STRINGS,
818 altstr->str, altstr->ofs, &altstr->ns);
819 }
820
821
parse_jedec(tuple_t * tuple,cistpl_jedec_t * jedec)822 static int parse_jedec(tuple_t *tuple, cistpl_jedec_t *jedec)
823 {
824 u_char *p, *q;
825 int nid;
826
827 p = (u_char *)tuple->TupleData;
828 q = p + tuple->TupleDataLen;
829
830 for (nid = 0; nid < CISTPL_MAX_DEVICES; nid++) {
831 if (p > q-2)
832 break;
833 jedec->id[nid].mfr = p[0];
834 jedec->id[nid].info = p[1];
835 p += 2;
836 }
837 jedec->nid = nid;
838 return 0;
839 }
840
841
parse_manfid(tuple_t * tuple,cistpl_manfid_t * m)842 static int parse_manfid(tuple_t *tuple, cistpl_manfid_t *m)
843 {
844 if (tuple->TupleDataLen < 4)
845 return -EINVAL;
846 m->manf = get_unaligned_le16(tuple->TupleData);
847 m->card = get_unaligned_le16(tuple->TupleData + 2);
848 return 0;
849 }
850
851
parse_funcid(tuple_t * tuple,cistpl_funcid_t * f)852 static int parse_funcid(tuple_t *tuple, cistpl_funcid_t *f)
853 {
854 u_char *p;
855 if (tuple->TupleDataLen < 2)
856 return -EINVAL;
857 p = (u_char *)tuple->TupleData;
858 f->func = p[0];
859 f->sysinit = p[1];
860 return 0;
861 }
862
863
parse_funce(tuple_t * tuple,cistpl_funce_t * f)864 static int parse_funce(tuple_t *tuple, cistpl_funce_t *f)
865 {
866 u_char *p;
867 int i;
868 if (tuple->TupleDataLen < 1)
869 return -EINVAL;
870 p = (u_char *)tuple->TupleData;
871 f->type = p[0];
872 for (i = 1; i < tuple->TupleDataLen; i++)
873 f->data[i-1] = p[i];
874 return 0;
875 }
876
877
parse_config(tuple_t * tuple,cistpl_config_t * config)878 static int parse_config(tuple_t *tuple, cistpl_config_t *config)
879 {
880 int rasz, rmsz, i;
881 u_char *p;
882
883 p = (u_char *)tuple->TupleData;
884 rasz = *p & 0x03;
885 rmsz = (*p & 0x3c) >> 2;
886 if (tuple->TupleDataLen < rasz+rmsz+4)
887 return -EINVAL;
888 config->last_idx = *(++p);
889 p++;
890 config->base = 0;
891 for (i = 0; i <= rasz; i++)
892 config->base += p[i] << (8*i);
893 p += rasz+1;
894 for (i = 0; i < 4; i++)
895 config->rmask[i] = 0;
896 for (i = 0; i <= rmsz; i++)
897 config->rmask[i>>2] += p[i] << (8*(i%4));
898 config->subtuples = tuple->TupleDataLen - (rasz+rmsz+4);
899 return 0;
900 }
901
902 /* The following routines are all used to parse the nightmarish
903 * config table entries.
904 */
905
parse_power(u_char * p,u_char * q,cistpl_power_t * pwr)906 static u_char *parse_power(u_char *p, u_char *q, cistpl_power_t *pwr)
907 {
908 int i;
909 u_int scale;
910
911 if (p == q)
912 return NULL;
913 pwr->present = *p;
914 pwr->flags = 0;
915 p++;
916 for (i = 0; i < 7; i++)
917 if (pwr->present & (1<<i)) {
918 if (p == q)
919 return NULL;
920 pwr->param[i] = POWER_CVT(*p);
921 scale = POWER_SCALE(*p);
922 while (*p & 0x80) {
923 if (++p == q)
924 return NULL;
925 if ((*p & 0x7f) < 100)
926 pwr->param[i] +=
927 (*p & 0x7f) * scale / 100;
928 else if (*p == 0x7d)
929 pwr->flags |= CISTPL_POWER_HIGHZ_OK;
930 else if (*p == 0x7e)
931 pwr->param[i] = 0;
932 else if (*p == 0x7f)
933 pwr->flags |= CISTPL_POWER_HIGHZ_REQ;
934 else
935 return NULL;
936 }
937 p++;
938 }
939 return p;
940 }
941
942
parse_timing(u_char * p,u_char * q,cistpl_timing_t * timing)943 static u_char *parse_timing(u_char *p, u_char *q, cistpl_timing_t *timing)
944 {
945 u_char scale;
946
947 if (p == q)
948 return NULL;
949 scale = *p;
950 if ((scale & 3) != 3) {
951 if (++p == q)
952 return NULL;
953 timing->wait = SPEED_CVT(*p);
954 timing->waitscale = exponent[scale & 3];
955 } else
956 timing->wait = 0;
957 scale >>= 2;
958 if ((scale & 7) != 7) {
959 if (++p == q)
960 return NULL;
961 timing->ready = SPEED_CVT(*p);
962 timing->rdyscale = exponent[scale & 7];
963 } else
964 timing->ready = 0;
965 scale >>= 3;
966 if (scale != 7) {
967 if (++p == q)
968 return NULL;
969 timing->reserved = SPEED_CVT(*p);
970 timing->rsvscale = exponent[scale];
971 } else
972 timing->reserved = 0;
973 p++;
974 return p;
975 }
976
977
parse_io(u_char * p,u_char * q,cistpl_io_t * io)978 static u_char *parse_io(u_char *p, u_char *q, cistpl_io_t *io)
979 {
980 int i, j, bsz, lsz;
981
982 if (p == q)
983 return NULL;
984 io->flags = *p;
985
986 if (!(*p & 0x80)) {
987 io->nwin = 1;
988 io->win[0].base = 0;
989 io->win[0].len = (1 << (io->flags & CISTPL_IO_LINES_MASK));
990 return p+1;
991 }
992
993 if (++p == q)
994 return NULL;
995 io->nwin = (*p & 0x0f) + 1;
996 bsz = (*p & 0x30) >> 4;
997 if (bsz == 3)
998 bsz++;
999 lsz = (*p & 0xc0) >> 6;
1000 if (lsz == 3)
1001 lsz++;
1002 p++;
1003
1004 for (i = 0; i < io->nwin; i++) {
1005 io->win[i].base = 0;
1006 io->win[i].len = 1;
1007 for (j = 0; j < bsz; j++, p++) {
1008 if (p == q)
1009 return NULL;
1010 io->win[i].base += *p << (j*8);
1011 }
1012 for (j = 0; j < lsz; j++, p++) {
1013 if (p == q)
1014 return NULL;
1015 io->win[i].len += *p << (j*8);
1016 }
1017 }
1018 return p;
1019 }
1020
1021
parse_mem(u_char * p,u_char * q,cistpl_mem_t * mem)1022 static u_char *parse_mem(u_char *p, u_char *q, cistpl_mem_t *mem)
1023 {
1024 int i, j, asz, lsz, has_ha;
1025 u_int len, ca, ha;
1026
1027 if (p == q)
1028 return NULL;
1029
1030 mem->nwin = (*p & 0x07) + 1;
1031 lsz = (*p & 0x18) >> 3;
1032 asz = (*p & 0x60) >> 5;
1033 has_ha = (*p & 0x80);
1034 if (++p == q)
1035 return NULL;
1036
1037 for (i = 0; i < mem->nwin; i++) {
1038 len = ca = ha = 0;
1039 for (j = 0; j < lsz; j++, p++) {
1040 if (p == q)
1041 return NULL;
1042 len += *p << (j*8);
1043 }
1044 for (j = 0; j < asz; j++, p++) {
1045 if (p == q)
1046 return NULL;
1047 ca += *p << (j*8);
1048 }
1049 if (has_ha)
1050 for (j = 0; j < asz; j++, p++) {
1051 if (p == q)
1052 return NULL;
1053 ha += *p << (j*8);
1054 }
1055 mem->win[i].len = len << 8;
1056 mem->win[i].card_addr = ca << 8;
1057 mem->win[i].host_addr = ha << 8;
1058 }
1059 return p;
1060 }
1061
1062
parse_irq(u_char * p,u_char * q,cistpl_irq_t * irq)1063 static u_char *parse_irq(u_char *p, u_char *q, cistpl_irq_t *irq)
1064 {
1065 if (p == q)
1066 return NULL;
1067 irq->IRQInfo1 = *p; p++;
1068 if (irq->IRQInfo1 & IRQ_INFO2_VALID) {
1069 if (p+2 > q)
1070 return NULL;
1071 irq->IRQInfo2 = (p[1]<<8) + p[0];
1072 p += 2;
1073 }
1074 return p;
1075 }
1076
1077
parse_cftable_entry(tuple_t * tuple,cistpl_cftable_entry_t * entry)1078 static int parse_cftable_entry(tuple_t *tuple,
1079 cistpl_cftable_entry_t *entry)
1080 {
1081 u_char *p, *q, features;
1082
1083 p = tuple->TupleData;
1084 q = p + tuple->TupleDataLen;
1085 entry->index = *p & 0x3f;
1086 entry->flags = 0;
1087 if (*p & 0x40)
1088 entry->flags |= CISTPL_CFTABLE_DEFAULT;
1089 if (*p & 0x80) {
1090 if (++p == q)
1091 return -EINVAL;
1092 if (*p & 0x10)
1093 entry->flags |= CISTPL_CFTABLE_BVDS;
1094 if (*p & 0x20)
1095 entry->flags |= CISTPL_CFTABLE_WP;
1096 if (*p & 0x40)
1097 entry->flags |= CISTPL_CFTABLE_RDYBSY;
1098 if (*p & 0x80)
1099 entry->flags |= CISTPL_CFTABLE_MWAIT;
1100 entry->interface = *p & 0x0f;
1101 } else
1102 entry->interface = 0;
1103
1104 /* Process optional features */
1105 if (++p == q)
1106 return -EINVAL;
1107 features = *p; p++;
1108
1109 /* Power options */
1110 if ((features & 3) > 0) {
1111 p = parse_power(p, q, &entry->vcc);
1112 if (p == NULL)
1113 return -EINVAL;
1114 } else
1115 entry->vcc.present = 0;
1116 if ((features & 3) > 1) {
1117 p = parse_power(p, q, &entry->vpp1);
1118 if (p == NULL)
1119 return -EINVAL;
1120 } else
1121 entry->vpp1.present = 0;
1122 if ((features & 3) > 2) {
1123 p = parse_power(p, q, &entry->vpp2);
1124 if (p == NULL)
1125 return -EINVAL;
1126 } else
1127 entry->vpp2.present = 0;
1128
1129 /* Timing options */
1130 if (features & 0x04) {
1131 p = parse_timing(p, q, &entry->timing);
1132 if (p == NULL)
1133 return -EINVAL;
1134 } else {
1135 entry->timing.wait = 0;
1136 entry->timing.ready = 0;
1137 entry->timing.reserved = 0;
1138 }
1139
1140 /* I/O window options */
1141 if (features & 0x08) {
1142 p = parse_io(p, q, &entry->io);
1143 if (p == NULL)
1144 return -EINVAL;
1145 } else
1146 entry->io.nwin = 0;
1147
1148 /* Interrupt options */
1149 if (features & 0x10) {
1150 p = parse_irq(p, q, &entry->irq);
1151 if (p == NULL)
1152 return -EINVAL;
1153 } else
1154 entry->irq.IRQInfo1 = 0;
1155
1156 switch (features & 0x60) {
1157 case 0x00:
1158 entry->mem.nwin = 0;
1159 break;
1160 case 0x20:
1161 entry->mem.nwin = 1;
1162 entry->mem.win[0].len = get_unaligned_le16(p) << 8;
1163 entry->mem.win[0].card_addr = 0;
1164 entry->mem.win[0].host_addr = 0;
1165 p += 2;
1166 if (p > q)
1167 return -EINVAL;
1168 break;
1169 case 0x40:
1170 entry->mem.nwin = 1;
1171 entry->mem.win[0].len = get_unaligned_le16(p) << 8;
1172 entry->mem.win[0].card_addr = get_unaligned_le16(p + 2) << 8;
1173 entry->mem.win[0].host_addr = 0;
1174 p += 4;
1175 if (p > q)
1176 return -EINVAL;
1177 break;
1178 case 0x60:
1179 p = parse_mem(p, q, &entry->mem);
1180 if (p == NULL)
1181 return -EINVAL;
1182 break;
1183 }
1184
1185 /* Misc features */
1186 if (features & 0x80) {
1187 if (p == q)
1188 return -EINVAL;
1189 entry->flags |= (*p << 8);
1190 while (*p & 0x80)
1191 if (++p == q)
1192 return -EINVAL;
1193 p++;
1194 }
1195
1196 entry->subtuples = q-p;
1197
1198 return 0;
1199 }
1200
1201
parse_device_geo(tuple_t * tuple,cistpl_device_geo_t * geo)1202 static int parse_device_geo(tuple_t *tuple, cistpl_device_geo_t *geo)
1203 {
1204 u_char *p, *q;
1205 int n;
1206
1207 p = (u_char *)tuple->TupleData;
1208 q = p + tuple->TupleDataLen;
1209
1210 for (n = 0; n < CISTPL_MAX_DEVICES; n++) {
1211 if (p > q-6)
1212 break;
1213 geo->geo[n].buswidth = p[0];
1214 geo->geo[n].erase_block = 1 << (p[1]-1);
1215 geo->geo[n].read_block = 1 << (p[2]-1);
1216 geo->geo[n].write_block = 1 << (p[3]-1);
1217 geo->geo[n].partition = 1 << (p[4]-1);
1218 geo->geo[n].interleave = 1 << (p[5]-1);
1219 p += 6;
1220 }
1221 geo->ngeo = n;
1222 return 0;
1223 }
1224
1225
parse_vers_2(tuple_t * tuple,cistpl_vers_2_t * v2)1226 static int parse_vers_2(tuple_t *tuple, cistpl_vers_2_t *v2)
1227 {
1228 u_char *p, *q;
1229
1230 if (tuple->TupleDataLen < 10)
1231 return -EINVAL;
1232
1233 p = tuple->TupleData;
1234 q = p + tuple->TupleDataLen;
1235
1236 v2->vers = p[0];
1237 v2->comply = p[1];
1238 v2->dindex = get_unaligned_le16(p + 2);
1239 v2->vspec8 = p[6];
1240 v2->vspec9 = p[7];
1241 v2->nhdr = p[8];
1242 p += 9;
1243 return parse_strings(p, q, 2, v2->str, &v2->vendor, NULL);
1244 }
1245
1246
parse_org(tuple_t * tuple,cistpl_org_t * org)1247 static int parse_org(tuple_t *tuple, cistpl_org_t *org)
1248 {
1249 u_char *p, *q;
1250 int i;
1251
1252 p = tuple->TupleData;
1253 q = p + tuple->TupleDataLen;
1254 if (p == q)
1255 return -EINVAL;
1256 org->data_org = *p;
1257 if (++p == q)
1258 return -EINVAL;
1259 for (i = 0; i < 30; i++) {
1260 org->desc[i] = *p;
1261 if (*p == '\0')
1262 break;
1263 if (++p == q)
1264 return -EINVAL;
1265 }
1266 return 0;
1267 }
1268
1269
parse_format(tuple_t * tuple,cistpl_format_t * fmt)1270 static int parse_format(tuple_t *tuple, cistpl_format_t *fmt)
1271 {
1272 u_char *p;
1273
1274 if (tuple->TupleDataLen < 10)
1275 return -EINVAL;
1276
1277 p = tuple->TupleData;
1278
1279 fmt->type = p[0];
1280 fmt->edc = p[1];
1281 fmt->offset = get_unaligned_le32(p + 2);
1282 fmt->length = get_unaligned_le32(p + 6);
1283
1284 return 0;
1285 }
1286
1287
pcmcia_parse_tuple(tuple_t * tuple,cisparse_t * parse)1288 int pcmcia_parse_tuple(tuple_t *tuple, cisparse_t *parse)
1289 {
1290 int ret = 0;
1291
1292 if (tuple->TupleDataLen > tuple->TupleDataMax)
1293 return -EINVAL;
1294 switch (tuple->TupleCode) {
1295 case CISTPL_DEVICE:
1296 case CISTPL_DEVICE_A:
1297 ret = parse_device(tuple, &parse->device);
1298 break;
1299 case CISTPL_CHECKSUM:
1300 ret = parse_checksum(tuple, &parse->checksum);
1301 break;
1302 case CISTPL_LONGLINK_A:
1303 case CISTPL_LONGLINK_C:
1304 ret = parse_longlink(tuple, &parse->longlink);
1305 break;
1306 case CISTPL_LONGLINK_MFC:
1307 ret = parse_longlink_mfc(tuple, &parse->longlink_mfc);
1308 break;
1309 case CISTPL_VERS_1:
1310 ret = parse_vers_1(tuple, &parse->version_1);
1311 break;
1312 case CISTPL_ALTSTR:
1313 ret = parse_altstr(tuple, &parse->altstr);
1314 break;
1315 case CISTPL_JEDEC_A:
1316 case CISTPL_JEDEC_C:
1317 ret = parse_jedec(tuple, &parse->jedec);
1318 break;
1319 case CISTPL_MANFID:
1320 ret = parse_manfid(tuple, &parse->manfid);
1321 break;
1322 case CISTPL_FUNCID:
1323 ret = parse_funcid(tuple, &parse->funcid);
1324 break;
1325 case CISTPL_FUNCE:
1326 ret = parse_funce(tuple, &parse->funce);
1327 break;
1328 case CISTPL_CONFIG:
1329 ret = parse_config(tuple, &parse->config);
1330 break;
1331 case CISTPL_CFTABLE_ENTRY:
1332 ret = parse_cftable_entry(tuple, &parse->cftable_entry);
1333 break;
1334 case CISTPL_DEVICE_GEO:
1335 case CISTPL_DEVICE_GEO_A:
1336 ret = parse_device_geo(tuple, &parse->device_geo);
1337 break;
1338 case CISTPL_VERS_2:
1339 ret = parse_vers_2(tuple, &parse->vers_2);
1340 break;
1341 case CISTPL_ORG:
1342 ret = parse_org(tuple, &parse->org);
1343 break;
1344 case CISTPL_FORMAT:
1345 case CISTPL_FORMAT_A:
1346 ret = parse_format(tuple, &parse->format);
1347 break;
1348 case CISTPL_NO_LINK:
1349 case CISTPL_LINKTARGET:
1350 ret = 0;
1351 break;
1352 default:
1353 ret = -EINVAL;
1354 break;
1355 }
1356 if (ret)
1357 pr_debug("parse_tuple failed %d\n", ret);
1358 return ret;
1359 }
1360 EXPORT_SYMBOL(pcmcia_parse_tuple);
1361
1362
1363 /**
1364 * pccard_validate_cis() - check whether card has a sensible CIS
1365 * @s: the struct pcmcia_socket we are to check
1366 * @info: returns the number of tuples in the (valid) CIS, or 0
1367 *
1368 * This tries to determine if a card has a sensible CIS. In @info, it
1369 * returns the number of tuples in the CIS, or 0 if the CIS looks bad. The
1370 * checks include making sure several critical tuples are present and
1371 * valid; seeing if the total number of tuples is reasonable; and
1372 * looking for tuples that use reserved codes.
1373 *
1374 * The function returns 0 on success.
1375 */
pccard_validate_cis(struct pcmcia_socket * s,unsigned int * info)1376 int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
1377 {
1378 tuple_t *tuple;
1379 cisparse_t *p;
1380 unsigned int count = 0;
1381 int ret, reserved, dev_ok = 0, ident_ok = 0;
1382
1383 if (!s)
1384 return -EINVAL;
1385
1386 if (s->functions || !(s->state & SOCKET_PRESENT)) {
1387 WARN_ON(1);
1388 return -EINVAL;
1389 }
1390
1391 /* We do not want to validate the CIS cache... */
1392 mutex_lock(&s->ops_mutex);
1393 destroy_cis_cache(s);
1394 mutex_unlock(&s->ops_mutex);
1395
1396 tuple = kmalloc(sizeof(*tuple), GFP_KERNEL);
1397 if (tuple == NULL) {
1398 dev_warn(&s->dev, "no memory to validate CIS\n");
1399 return -ENOMEM;
1400 }
1401 p = kmalloc(sizeof(*p), GFP_KERNEL);
1402 if (p == NULL) {
1403 kfree(tuple);
1404 dev_warn(&s->dev, "no memory to validate CIS\n");
1405 return -ENOMEM;
1406 }
1407
1408 count = reserved = 0;
1409 tuple->DesiredTuple = RETURN_FIRST_TUPLE;
1410 tuple->Attributes = TUPLE_RETURN_COMMON;
1411 ret = pccard_get_first_tuple(s, BIND_FN_ALL, tuple);
1412 if (ret != 0)
1413 goto done;
1414
1415 /* First tuple should be DEVICE; we should really have either that
1416 or a CFTABLE_ENTRY of some sort */
1417 if ((tuple->TupleCode == CISTPL_DEVICE) ||
1418 (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY, p)) ||
1419 (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY_CB, p)))
1420 dev_ok++;
1421
1422 /* All cards should have a MANFID tuple, and/or a VERS_1 or VERS_2
1423 tuple, for card identification. Certain old D-Link and Linksys
1424 cards have only a broken VERS_2 tuple; hence the bogus test. */
1425 if ((pccard_read_tuple(s, BIND_FN_ALL, CISTPL_MANFID, p) == 0) ||
1426 (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_1, p) == 0) ||
1427 (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_2, p) != -ENOSPC))
1428 ident_ok++;
1429
1430 if (!dev_ok && !ident_ok)
1431 goto done;
1432
1433 for (count = 1; count < MAX_TUPLES; count++) {
1434 ret = pccard_get_next_tuple(s, BIND_FN_ALL, tuple);
1435 if (ret != 0)
1436 break;
1437 if (((tuple->TupleCode > 0x23) && (tuple->TupleCode < 0x40)) ||
1438 ((tuple->TupleCode > 0x47) && (tuple->TupleCode < 0x80)) ||
1439 ((tuple->TupleCode > 0x90) && (tuple->TupleCode < 0xff)))
1440 reserved++;
1441 }
1442 if ((count == MAX_TUPLES) || (reserved > 5) ||
1443 ((!dev_ok || !ident_ok) && (count > 10)))
1444 count = 0;
1445
1446 ret = 0;
1447
1448 done:
1449 /* invalidate CIS cache on failure */
1450 if (!dev_ok || !ident_ok || !count) {
1451 mutex_lock(&s->ops_mutex);
1452 destroy_cis_cache(s);
1453 mutex_unlock(&s->ops_mutex);
1454 /* We differentiate between dev_ok, ident_ok and count
1455 failures to allow for an override for anonymous cards
1456 in ds.c */
1457 if (!dev_ok || !ident_ok)
1458 ret = -EIO;
1459 else
1460 ret = -EFAULT;
1461 }
1462
1463 if (info)
1464 *info = count;
1465 kfree(tuple);
1466 kfree(p);
1467 return ret;
1468 }
1469
1470
1471 #define to_socket(_dev) container_of(_dev, struct pcmcia_socket, dev)
1472
pccard_extract_cis(struct pcmcia_socket * s,char * buf,loff_t off,size_t count)1473 static ssize_t pccard_extract_cis(struct pcmcia_socket *s, char *buf,
1474 loff_t off, size_t count)
1475 {
1476 tuple_t tuple;
1477 int status, i;
1478 loff_t pointer = 0;
1479 ssize_t ret = 0;
1480 u_char *tuplebuffer;
1481 u_char *tempbuffer;
1482
1483 tuplebuffer = kmalloc_array(256, sizeof(u_char), GFP_KERNEL);
1484 if (!tuplebuffer)
1485 return -ENOMEM;
1486
1487 tempbuffer = kmalloc_array(258, sizeof(u_char), GFP_KERNEL);
1488 if (!tempbuffer) {
1489 ret = -ENOMEM;
1490 goto free_tuple;
1491 }
1492
1493 memset(&tuple, 0, sizeof(tuple_t));
1494
1495 tuple.Attributes = TUPLE_RETURN_LINK | TUPLE_RETURN_COMMON;
1496 tuple.DesiredTuple = RETURN_FIRST_TUPLE;
1497 tuple.TupleOffset = 0;
1498
1499 status = pccard_get_first_tuple(s, BIND_FN_ALL, &tuple);
1500 while (!status) {
1501 tuple.TupleData = tuplebuffer;
1502 tuple.TupleDataMax = 255;
1503 memset(tuplebuffer, 0, sizeof(u_char) * 255);
1504
1505 status = pccard_get_tuple_data(s, &tuple);
1506 if (status)
1507 break;
1508
1509 if (off < (pointer + 2 + tuple.TupleDataLen)) {
1510 tempbuffer[0] = tuple.TupleCode & 0xff;
1511 tempbuffer[1] = tuple.TupleLink & 0xff;
1512 for (i = 0; i < tuple.TupleDataLen; i++)
1513 tempbuffer[i + 2] = tuplebuffer[i] & 0xff;
1514
1515 for (i = 0; i < (2 + tuple.TupleDataLen); i++) {
1516 if (((i + pointer) >= off) &&
1517 (i + pointer) < (off + count)) {
1518 buf[ret] = tempbuffer[i];
1519 ret++;
1520 }
1521 }
1522 }
1523
1524 pointer += 2 + tuple.TupleDataLen;
1525
1526 if (pointer >= (off + count))
1527 break;
1528
1529 if (tuple.TupleCode == CISTPL_END)
1530 break;
1531 status = pccard_get_next_tuple(s, BIND_FN_ALL, &tuple);
1532 }
1533
1534 kfree(tempbuffer);
1535 free_tuple:
1536 kfree(tuplebuffer);
1537
1538 return ret;
1539 }
1540
1541
pccard_show_cis(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)1542 static ssize_t pccard_show_cis(struct file *filp, struct kobject *kobj,
1543 struct bin_attribute *bin_attr,
1544 char *buf, loff_t off, size_t count)
1545 {
1546 unsigned int size = 0x200;
1547
1548 if (off >= size)
1549 count = 0;
1550 else {
1551 struct pcmcia_socket *s;
1552 unsigned int chains = 1;
1553
1554 if (off + count > size)
1555 count = size - off;
1556
1557 s = to_socket(container_of(kobj, struct device, kobj));
1558
1559 if (!(s->state & SOCKET_PRESENT))
1560 return -ENODEV;
1561 if (!s->functions && pccard_validate_cis(s, &chains))
1562 return -EIO;
1563 if (!chains)
1564 return -ENODATA;
1565
1566 count = pccard_extract_cis(s, buf, off, count);
1567 }
1568
1569 return count;
1570 }
1571
1572
pccard_store_cis(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)1573 static ssize_t pccard_store_cis(struct file *filp, struct kobject *kobj,
1574 struct bin_attribute *bin_attr,
1575 char *buf, loff_t off, size_t count)
1576 {
1577 struct pcmcia_socket *s;
1578 int error;
1579
1580 error = security_locked_down(LOCKDOWN_PCMCIA_CIS);
1581 if (error)
1582 return error;
1583
1584 s = to_socket(container_of(kobj, struct device, kobj));
1585
1586 if (off)
1587 return -EINVAL;
1588
1589 if (count >= CISTPL_MAX_CIS_SIZE)
1590 return -EINVAL;
1591
1592 if (!(s->state & SOCKET_PRESENT))
1593 return -ENODEV;
1594
1595 error = pcmcia_replace_cis(s, buf, count);
1596 if (error)
1597 return -EIO;
1598
1599 pcmcia_parse_uevents(s, PCMCIA_UEVENT_REQUERY);
1600
1601 return count;
1602 }
1603
1604
1605 const struct bin_attribute pccard_cis_attr = {
1606 .attr = { .name = "cis", .mode = S_IRUGO | S_IWUSR },
1607 .size = 0x200,
1608 .read = pccard_show_cis,
1609 .write = pccard_store_cis,
1610 };
1611