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1/* $NetBSD: parse.c,v 1.11 2000/09/24 02:19:54 augustss Exp $ */
2
3/*
4 * Copyright (c) 1999 Lennart Augustsson
4 * Copyright (c) 1999, 2001 Lennart Augustsson <augustss@netbsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright

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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/lib/libusbhid/parse.c 113193 2003-04-07 00:49:53Z mdodd $");
30__FBSDID("$FreeBSD: head/lib/libusbhid/parse.c 113273 2003-04-09 01:52:49Z mdodd $");
31
32#include <assert.h>
33#include <stdlib.h>
34#include <string.h>
35#include <sys/time.h>
36
37#include <dev/usb/usb.h>
38#include <dev/usb/usbhid.h>
39
40#include "libusbhid.h"
40#include "usbhid.h"
41#include "usbvar.h"
42
43#define MAXUSAGE 100
44struct hid_data {
45 u_char *start;
46 u_char *end;
47 u_char *p;
48 hid_item_t cur;
49 unsigned int usages[MAXUSAGE];
50 int nusage;
51 int minset;
52 int logminsize;
53 int multi;
54 int multimax;
55 int kindset;
56 int reportid;
57
56 /* Absolute data position (bits) for input/output/feature.
57 Assumes that hid_input, hid_output and hid_feature have
58 values 0, 1 and 2. */
59 unsigned int kindpos[3];
58 /*
59 * The start of collection item has no report ID set, so save
60 * it until we know the ID.
61 */
62 hid_item_t savedcoll;
63 u_char hassavedcoll;
64 /*
65 * Absolute data position (bits) for input/output/feature.
66 * Assumes that hid_input, hid_output and hid_feature have
67 * values 0, 1 and 2.
68 */
69 unsigned int kindpos[3];
70};
71
72static int min(int x, int y) { return x < y ? x : y; }
73
74static int hid_get_item_raw(hid_data_t s, hid_item_t *h);
75
76static void
77hid_clear_local(hid_item_t *c)
78{
79 c->usage = 0;
80 c->usage_minimum = 0;
81 c->usage_maximum = 0;
82 c->designator_index = 0;
83 c->designator_minimum = 0;
84 c->designator_maximum = 0;
85 c->string_index = 0;
86 c->string_minimum = 0;
87 c->string_maximum = 0;
88 c->set_delimiter = 0;
89 c->report_size = 0;
90}
91
92hid_data_t
81hid_start_parse(report_desc_t d, int kindset)
93hid_start_parse(report_desc_t d, int kindset, int id)
94{
95 struct hid_data *s;
96
97 s = malloc(sizeof *s);
98 memset(s, 0, sizeof *s);
99 s->start = s->p = d->data;
100 s->end = d->data + d->size;
101 s->kindset = kindset;
102 s->reportid = id;
103 s->hassavedcoll = 0;
104 return (s);
105}
106
107void
108hid_end_parse(hid_data_t s)
109{
110 while (s->cur.next) {
111 hid_item_t *hi = s->cur.next->next;
112 free(s->cur.next);
113 s->cur.next = hi;
114 }
115 free(s);
116}
117
118int
119hid_get_item(hid_data_t s, hid_item_t *h)
120{
121 int r;
122
123 for (;;) {
124 r = hid_get_item_raw(s, h);
125 if (r <= 0)
126 break;
127 if (h->report_ID == s->reportid || s->reportid == -1)
128 break;
129 }
130 return (r);
131}
132
133#define REPORT_SAVED_COLL \
134 do { \
135 if (s->hassavedcoll) { \
136 *h = s->savedcoll; \
137 h->report_ID = c->report_ID; \
138 s->hassavedcoll = 0; \
139 return (1); \
140 } \
141 } while(/*LINTED*/ 0)
142
143static int
144hid_get_item_raw(hid_data_t s, hid_item_t *h)
145{
146 hid_item_t *c;
147 unsigned int bTag = 0, bType = 0, bSize;
148 unsigned char *data;
149 int dval;
150 unsigned char *p;
151 hid_item_t *hi;
152 hid_item_t nc;
153 int i;
154 hid_kind_t retkind;
155
156 c = &s->cur;
157
158 top:
159 if (s->multimax) {
160 REPORT_SAVED_COLL;
161 if (c->logical_minimum >= c->logical_maximum) {
162 if (s->logminsize == 1)
163 c->logical_minimum =(int8_t)c->logical_minimum;
164 else if (s->logminsize == 2)
165 c->logical_minimum =(int16_t)c->logical_minimum;
166 }
167 if (s->multi < s->multimax) {
168 c->usage = s->usages[min(s->multi, s->nusage-1)];
169 s->multi++;
170 *h = *c;
124
125 /* 'multimax' is only non-zero if the current
126 item kind is input/output/feature */
171 /*
172 * 'multimax' is only non-zero if the current
173 * item kind is input/output/feature
174 */
175 h->pos = s->kindpos[c->kind];
176 s->kindpos[c->kind] += c->report_size;
177 h->next = 0;
178 return (1);
179 } else {
180 c->report_count = s->multimax;
181 s->multimax = 0;
182 s->nusage = 0;

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251 if (s->minset) {
252 for (i = c->usage_minimum;
253 i <= c->usage_maximum;
254 i++) {
255 s->usages[s->nusage] = i;
256 if (s->nusage < MAXUSAGE-1)
257 s->nusage++;
258 }
259 c->usage_minimum = 0;
260 c->usage_maximum = 0;
261 s->minset = 0;
262 }
263 goto top;
264 } else {
265 if (s->minset)
266 c->usage = c->usage_minimum;
267 *h = *c;
268 h->next = 0;
269 h->pos = s->kindpos[c->kind];
220 s->kindpos[c->kind] += c->report_size * c->report_count;
270 s->kindpos[c->kind] +=
271 c->report_size * c->report_count;
272 hid_clear_local(c);
273 s->minset = 0;
274 return (1);
275 }
276 case 9: /* Output */
277 retkind = hid_output;
278 goto ret;
279 case 10: /* Collection */
280 c->kind = hid_collection;
281 c->collection = dval;
282 c->collevel++;
232 *h = *c;
283 nc = *c;
284 hid_clear_local(c);
234 c->report_ID = NO_REPORT_ID;
285 /*c->report_ID = NO_REPORT_ID;*/
286 s->nusage = 0;
236 return (1);
287 if (s->hassavedcoll) {
288 *h = s->savedcoll;
289 h->report_ID = nc.report_ID;
290 s->savedcoll = nc;
291 return (1);
292 } else {
293 s->hassavedcoll = 1;
294 s->savedcoll = nc;
295 }
296 break;
297 case 11: /* Feature */
298 retkind = hid_feature;
299 goto ret;
300 case 12: /* End collection */
301 REPORT_SAVED_COLL;
302 c->kind = hid_endcollection;
303 c->collevel--;
304 *h = *c;
305 /*hid_clear_local(c);*/
306 s->nusage = 0;
307 return (1);
308 default:
309 return (-2);
310 }
311 break;
312
313 case 1: /* Global */
314 switch (bTag) {
315 case 0:
316 c->_usage_page = dval << 16;
317 break;
318 case 1:
319 c->logical_minimum = dval;
320 s->logminsize = bSize;
321 break;
322 case 2:
323 c->logical_maximum = dval;
324 break;
325 case 3:
326 c->physical_maximum = dval;
327 break;
328 case 4:

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334 case 6:
335 c->unit = dval;
336 break;
337 case 7:
338 c->report_size = dval;
339 break;
340 case 8:
341 c->report_ID = dval;
342 s->kindpos[hid_input] =
343 s->kindpos[hid_output] =
344 s->kindpos[hid_feature] = 0;
345 break;
346 case 9:
347 c->report_count = dval;
348 break;
349 case 10: /* Push */
350 hi = malloc(sizeof *hi);
351 *hi = s->cur;
352 c->next = hi;

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358 break;
359 default:
360 return (-3);
361 }
362 break;
363 case 2: /* Local */
364 switch (bTag) {
365 case 0:
300 if (bSize == 1)
301 dval = c->_usage_page | (dval&0xff);
302 else if (bSize == 2)
303 dval = c->_usage_page | (dval&0xffff);
304 c->usage = dval;
366 c->usage = c->_usage_page | dval;
367 if (s->nusage < MAXUSAGE)
306 s->usages[s->nusage++] = dval;
368 s->usages[s->nusage++] = c->usage;
369 /* else XXX */
370 break;
371 case 1:
372 s->minset = 1;
311 if (bSize == 1)
312 dval = c->_usage_page | (dval&0xff);
313 else if (bSize == 2)
314 dval = c->_usage_page | (dval&0xffff);
315 c->usage_minimum = dval;
373 c->usage_minimum = c->_usage_page | dval;
374 break;
375 case 2:
318 if (bSize == 1)
319 dval = c->_usage_page | (dval&0xff);
320 else if (bSize == 2)
321 dval = c->_usage_page | (dval&0xffff);
322 c->usage_maximum = dval;
376 c->usage_maximum = c->_usage_page | dval;
377 break;
378 case 3:
379 c->designator_index = dval;
380 break;
381 case 4:
382 c->designator_minimum = dval;
383 break;
384 case 5:

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402 break;
403 default:
404 return (-5);
405 }
406 }
407}
408
409int
356hid_report_size(report_desc_t r, unsigned int id, enum hid_kind k)
410hid_report_size(report_desc_t r, enum hid_kind k, int id)
411{
412 struct hid_data *d;
413 hid_item_t h;
360 unsigned int size = 0;
414 int size;
415
416 memset(&h, 0, sizeof h);
363 d = hid_start_parse(r, 1<<k);
364 while (hid_get_item(d, &h)) {
417 size = 0;
418 for (d = hid_start_parse(r, 1<<k, id); hid_get_item(d, &h); ) {
419 if (h.report_ID == id && h.kind == k) {
366 unsigned int newsize = h.pos + h.report_size;
367 if (newsize > size)
368 size = newsize;
420 size = d->kindpos[k];
421 }
422 }
423 hid_end_parse(d);
372
373 if (id != NO_REPORT_ID)
374 size += 8; /* add 8 bits for the report ID */
375
376 return ((size + 7) / 8); /* return size in bytes */
424 return ((size + 7) / 8);
425}
426
427int
380hid_locate(report_desc_t desc, unsigned int u, enum hid_kind k, hid_item_t *h)
428hid_locate(report_desc_t desc, unsigned int u, enum hid_kind k,
429 hid_item_t *h, int id)
430{
431 hid_data_t d;
432
384 for (d = hid_start_parse(desc, 1<
433 for (d = hid_start_parse(desc, 1<<k, id); hid_get_item(d, h); ) {
434 if (h->kind == k && !(h->flags & HIO_CONST) && h->usage == u) {
435 hid_end_parse(d);
436 return (1);
437 }
438 }
439 hid_end_parse(d);
440 h->report_size = 0;
441 return (0);
442}