Commit | Line | Data |
---|---|---|
dde5845a | 1 | /* |
229695e5 | 2 | * HID support for Linux |
dde5845a JK |
3 | * |
4 | * Copyright (c) 1999 Andreas Gal | |
5 | * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> | |
6 | * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc | |
f142b3a4 | 7 | * Copyright (c) 2006-2007 Jiri Kosina |
dde5845a JK |
8 | */ |
9 | ||
10 | /* | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the Free | |
13 | * Software Foundation; either version 2 of the License, or (at your option) | |
14 | * any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/kernel.h> | |
dde5845a JK |
21 | #include <linux/list.h> |
22 | #include <linux/mm.h> | |
dde5845a JK |
23 | #include <linux/spinlock.h> |
24 | #include <asm/unaligned.h> | |
25 | #include <asm/byteorder.h> | |
26 | #include <linux/input.h> | |
27 | #include <linux/wait.h> | |
47a80edb | 28 | #include <linux/vmalloc.h> |
c4124c9b | 29 | #include <linux/sched.h> |
dde5845a | 30 | |
dde5845a JK |
31 | #include <linux/hid.h> |
32 | #include <linux/hiddev.h> | |
c080d89a | 33 | #include <linux/hid-debug.h> |
86166b7b | 34 | #include <linux/hidraw.h> |
dde5845a JK |
35 | |
36 | /* | |
37 | * Version Information | |
38 | */ | |
39 | ||
40 | #define DRIVER_VERSION "v2.6" | |
f142b3a4 | 41 | #define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik, Jiri Kosina" |
53149801 | 42 | #define DRIVER_DESC "HID core driver" |
dde5845a JK |
43 | #define DRIVER_LICENSE "GPL" |
44 | ||
58037eb9 JK |
45 | #ifdef CONFIG_HID_DEBUG |
46 | int hid_debug = 0; | |
377e10fb AH |
47 | module_param_named(debug, hid_debug, int, 0600); |
48 | MODULE_PARM_DESC(debug, "HID debugging (0=off, 1=probing info, 2=continuous data dumping)"); | |
58037eb9 JK |
49 | EXPORT_SYMBOL_GPL(hid_debug); |
50 | #endif | |
51 | ||
dde5845a JK |
52 | /* |
53 | * Register a new report for a device. | |
54 | */ | |
55 | ||
56 | static struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id) | |
57 | { | |
58 | struct hid_report_enum *report_enum = device->report_enum + type; | |
59 | struct hid_report *report; | |
60 | ||
61 | if (report_enum->report_id_hash[id]) | |
62 | return report_enum->report_id_hash[id]; | |
63 | ||
64 | if (!(report = kzalloc(sizeof(struct hid_report), GFP_KERNEL))) | |
65 | return NULL; | |
66 | ||
67 | if (id != 0) | |
68 | report_enum->numbered = 1; | |
69 | ||
70 | report->id = id; | |
71 | report->type = type; | |
72 | report->size = 0; | |
73 | report->device = device; | |
74 | report_enum->report_id_hash[id] = report; | |
75 | ||
76 | list_add_tail(&report->list, &report_enum->report_list); | |
77 | ||
78 | return report; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Register a new field for this report. | |
83 | */ | |
84 | ||
85 | static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values) | |
86 | { | |
87 | struct hid_field *field; | |
88 | ||
89 | if (report->maxfield == HID_MAX_FIELDS) { | |
58037eb9 | 90 | dbg_hid("too many fields in report\n"); |
dde5845a JK |
91 | return NULL; |
92 | } | |
93 | ||
94 | if (!(field = kzalloc(sizeof(struct hid_field) + usages * sizeof(struct hid_usage) | |
95 | + values * sizeof(unsigned), GFP_KERNEL))) return NULL; | |
96 | ||
97 | field->index = report->maxfield++; | |
98 | report->field[field->index] = field; | |
99 | field->usage = (struct hid_usage *)(field + 1); | |
282bfd4c | 100 | field->value = (s32 *)(field->usage + usages); |
dde5845a JK |
101 | field->report = report; |
102 | ||
103 | return field; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Open a collection. The type/usage is pushed on the stack. | |
108 | */ | |
109 | ||
110 | static int open_collection(struct hid_parser *parser, unsigned type) | |
111 | { | |
112 | struct hid_collection *collection; | |
113 | unsigned usage; | |
114 | ||
115 | usage = parser->local.usage[0]; | |
116 | ||
117 | if (parser->collection_stack_ptr == HID_COLLECTION_STACK_SIZE) { | |
58037eb9 | 118 | dbg_hid("collection stack overflow\n"); |
dde5845a JK |
119 | return -1; |
120 | } | |
121 | ||
122 | if (parser->device->maxcollection == parser->device->collection_size) { | |
123 | collection = kmalloc(sizeof(struct hid_collection) * | |
124 | parser->device->collection_size * 2, GFP_KERNEL); | |
125 | if (collection == NULL) { | |
58037eb9 | 126 | dbg_hid("failed to reallocate collection array\n"); |
dde5845a JK |
127 | return -1; |
128 | } | |
129 | memcpy(collection, parser->device->collection, | |
130 | sizeof(struct hid_collection) * | |
131 | parser->device->collection_size); | |
132 | memset(collection + parser->device->collection_size, 0, | |
133 | sizeof(struct hid_collection) * | |
134 | parser->device->collection_size); | |
135 | kfree(parser->device->collection); | |
136 | parser->device->collection = collection; | |
137 | parser->device->collection_size *= 2; | |
138 | } | |
139 | ||
140 | parser->collection_stack[parser->collection_stack_ptr++] = | |
141 | parser->device->maxcollection; | |
142 | ||
143 | collection = parser->device->collection + | |
144 | parser->device->maxcollection++; | |
145 | collection->type = type; | |
146 | collection->usage = usage; | |
147 | collection->level = parser->collection_stack_ptr - 1; | |
148 | ||
149 | if (type == HID_COLLECTION_APPLICATION) | |
150 | parser->device->maxapplication++; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Close a collection. | |
157 | */ | |
158 | ||
159 | static int close_collection(struct hid_parser *parser) | |
160 | { | |
161 | if (!parser->collection_stack_ptr) { | |
58037eb9 | 162 | dbg_hid("collection stack underflow\n"); |
dde5845a JK |
163 | return -1; |
164 | } | |
165 | parser->collection_stack_ptr--; | |
166 | return 0; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Climb up the stack, search for the specified collection type | |
171 | * and return the usage. | |
172 | */ | |
173 | ||
174 | static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type) | |
175 | { | |
176 | int n; | |
177 | for (n = parser->collection_stack_ptr - 1; n >= 0; n--) | |
178 | if (parser->device->collection[parser->collection_stack[n]].type == type) | |
179 | return parser->device->collection[parser->collection_stack[n]].usage; | |
180 | return 0; /* we know nothing about this usage type */ | |
181 | } | |
182 | ||
183 | /* | |
184 | * Add a usage to the temporary parser table. | |
185 | */ | |
186 | ||
187 | static int hid_add_usage(struct hid_parser *parser, unsigned usage) | |
188 | { | |
189 | if (parser->local.usage_index >= HID_MAX_USAGES) { | |
58037eb9 | 190 | dbg_hid("usage index exceeded\n"); |
dde5845a JK |
191 | return -1; |
192 | } | |
193 | parser->local.usage[parser->local.usage_index] = usage; | |
194 | parser->local.collection_index[parser->local.usage_index] = | |
195 | parser->collection_stack_ptr ? | |
196 | parser->collection_stack[parser->collection_stack_ptr - 1] : 0; | |
197 | parser->local.usage_index++; | |
198 | return 0; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Register a new field for this report. | |
203 | */ | |
204 | ||
205 | static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsigned flags) | |
206 | { | |
207 | struct hid_report *report; | |
208 | struct hid_field *field; | |
209 | int usages; | |
210 | unsigned offset; | |
211 | int i; | |
212 | ||
213 | if (!(report = hid_register_report(parser->device, report_type, parser->global.report_id))) { | |
58037eb9 | 214 | dbg_hid("hid_register_report failed\n"); |
dde5845a JK |
215 | return -1; |
216 | } | |
217 | ||
218 | if (parser->global.logical_maximum < parser->global.logical_minimum) { | |
58037eb9 | 219 | dbg_hid("logical range invalid %d %d\n", parser->global.logical_minimum, parser->global.logical_maximum); |
dde5845a JK |
220 | return -1; |
221 | } | |
222 | ||
223 | offset = report->size; | |
224 | report->size += parser->global.report_size * parser->global.report_count; | |
225 | ||
226 | if (!parser->local.usage_index) /* Ignore padding fields */ | |
227 | return 0; | |
228 | ||
229 | usages = max_t(int, parser->local.usage_index, parser->global.report_count); | |
230 | ||
231 | if ((field = hid_register_field(report, usages, parser->global.report_count)) == NULL) | |
232 | return 0; | |
233 | ||
234 | field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL); | |
235 | field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL); | |
236 | field->application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION); | |
237 | ||
238 | for (i = 0; i < usages; i++) { | |
239 | int j = i; | |
240 | /* Duplicate the last usage we parsed if we have excess values */ | |
241 | if (i >= parser->local.usage_index) | |
242 | j = parser->local.usage_index - 1; | |
243 | field->usage[i].hid = parser->local.usage[j]; | |
244 | field->usage[i].collection_index = | |
245 | parser->local.collection_index[j]; | |
246 | } | |
247 | ||
248 | field->maxusage = usages; | |
249 | field->flags = flags; | |
250 | field->report_offset = offset; | |
251 | field->report_type = report_type; | |
252 | field->report_size = parser->global.report_size; | |
253 | field->report_count = parser->global.report_count; | |
254 | field->logical_minimum = parser->global.logical_minimum; | |
255 | field->logical_maximum = parser->global.logical_maximum; | |
256 | field->physical_minimum = parser->global.physical_minimum; | |
257 | field->physical_maximum = parser->global.physical_maximum; | |
258 | field->unit_exponent = parser->global.unit_exponent; | |
259 | field->unit = parser->global.unit; | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Read data value from item. | |
266 | */ | |
267 | ||
268 | static u32 item_udata(struct hid_item *item) | |
269 | { | |
270 | switch (item->size) { | |
271 | case 1: return item->data.u8; | |
272 | case 2: return item->data.u16; | |
273 | case 4: return item->data.u32; | |
274 | } | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static s32 item_sdata(struct hid_item *item) | |
279 | { | |
280 | switch (item->size) { | |
281 | case 1: return item->data.s8; | |
282 | case 2: return item->data.s16; | |
283 | case 4: return item->data.s32; | |
284 | } | |
285 | return 0; | |
286 | } | |
287 | ||
288 | /* | |
289 | * Process a global item. | |
290 | */ | |
291 | ||
292 | static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) | |
293 | { | |
294 | switch (item->tag) { | |
295 | ||
296 | case HID_GLOBAL_ITEM_TAG_PUSH: | |
297 | ||
298 | if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) { | |
58037eb9 | 299 | dbg_hid("global enviroment stack overflow\n"); |
dde5845a JK |
300 | return -1; |
301 | } | |
302 | ||
303 | memcpy(parser->global_stack + parser->global_stack_ptr++, | |
304 | &parser->global, sizeof(struct hid_global)); | |
305 | return 0; | |
306 | ||
307 | case HID_GLOBAL_ITEM_TAG_POP: | |
308 | ||
309 | if (!parser->global_stack_ptr) { | |
58037eb9 | 310 | dbg_hid("global enviroment stack underflow\n"); |
dde5845a JK |
311 | return -1; |
312 | } | |
313 | ||
314 | memcpy(&parser->global, parser->global_stack + --parser->global_stack_ptr, | |
315 | sizeof(struct hid_global)); | |
316 | return 0; | |
317 | ||
318 | case HID_GLOBAL_ITEM_TAG_USAGE_PAGE: | |
319 | parser->global.usage_page = item_udata(item); | |
320 | return 0; | |
321 | ||
322 | case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM: | |
323 | parser->global.logical_minimum = item_sdata(item); | |
324 | return 0; | |
325 | ||
326 | case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM: | |
327 | if (parser->global.logical_minimum < 0) | |
328 | parser->global.logical_maximum = item_sdata(item); | |
329 | else | |
330 | parser->global.logical_maximum = item_udata(item); | |
331 | return 0; | |
332 | ||
333 | case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM: | |
334 | parser->global.physical_minimum = item_sdata(item); | |
335 | return 0; | |
336 | ||
337 | case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM: | |
338 | if (parser->global.physical_minimum < 0) | |
339 | parser->global.physical_maximum = item_sdata(item); | |
340 | else | |
341 | parser->global.physical_maximum = item_udata(item); | |
342 | return 0; | |
343 | ||
344 | case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT: | |
345 | parser->global.unit_exponent = item_sdata(item); | |
346 | return 0; | |
347 | ||
348 | case HID_GLOBAL_ITEM_TAG_UNIT: | |
349 | parser->global.unit = item_udata(item); | |
350 | return 0; | |
351 | ||
352 | case HID_GLOBAL_ITEM_TAG_REPORT_SIZE: | |
353 | if ((parser->global.report_size = item_udata(item)) > 32) { | |
58037eb9 | 354 | dbg_hid("invalid report_size %d\n", parser->global.report_size); |
dde5845a JK |
355 | return -1; |
356 | } | |
357 | return 0; | |
358 | ||
359 | case HID_GLOBAL_ITEM_TAG_REPORT_COUNT: | |
360 | if ((parser->global.report_count = item_udata(item)) > HID_MAX_USAGES) { | |
58037eb9 | 361 | dbg_hid("invalid report_count %d\n", parser->global.report_count); |
dde5845a JK |
362 | return -1; |
363 | } | |
364 | return 0; | |
365 | ||
366 | case HID_GLOBAL_ITEM_TAG_REPORT_ID: | |
367 | if ((parser->global.report_id = item_udata(item)) == 0) { | |
58037eb9 | 368 | dbg_hid("report_id 0 is invalid\n"); |
dde5845a JK |
369 | return -1; |
370 | } | |
371 | return 0; | |
372 | ||
373 | default: | |
58037eb9 | 374 | dbg_hid("unknown global tag 0x%x\n", item->tag); |
dde5845a JK |
375 | return -1; |
376 | } | |
377 | } | |
378 | ||
379 | /* | |
380 | * Process a local item. | |
381 | */ | |
382 | ||
383 | static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) | |
384 | { | |
385 | __u32 data; | |
386 | unsigned n; | |
387 | ||
388 | if (item->size == 0) { | |
58037eb9 | 389 | dbg_hid("item data expected for local item\n"); |
dde5845a JK |
390 | return -1; |
391 | } | |
392 | ||
393 | data = item_udata(item); | |
394 | ||
395 | switch (item->tag) { | |
396 | ||
397 | case HID_LOCAL_ITEM_TAG_DELIMITER: | |
398 | ||
399 | if (data) { | |
400 | /* | |
401 | * We treat items before the first delimiter | |
402 | * as global to all usage sets (branch 0). | |
403 | * In the moment we process only these global | |
404 | * items and the first delimiter set. | |
405 | */ | |
406 | if (parser->local.delimiter_depth != 0) { | |
58037eb9 | 407 | dbg_hid("nested delimiters\n"); |
dde5845a JK |
408 | return -1; |
409 | } | |
410 | parser->local.delimiter_depth++; | |
411 | parser->local.delimiter_branch++; | |
412 | } else { | |
413 | if (parser->local.delimiter_depth < 1) { | |
58037eb9 | 414 | dbg_hid("bogus close delimiter\n"); |
dde5845a JK |
415 | return -1; |
416 | } | |
417 | parser->local.delimiter_depth--; | |
418 | } | |
419 | return 1; | |
420 | ||
421 | case HID_LOCAL_ITEM_TAG_USAGE: | |
422 | ||
423 | if (parser->local.delimiter_branch > 1) { | |
58037eb9 | 424 | dbg_hid("alternative usage ignored\n"); |
dde5845a JK |
425 | return 0; |
426 | } | |
427 | ||
428 | if (item->size <= 2) | |
429 | data = (parser->global.usage_page << 16) + data; | |
430 | ||
431 | return hid_add_usage(parser, data); | |
432 | ||
433 | case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM: | |
434 | ||
435 | if (parser->local.delimiter_branch > 1) { | |
58037eb9 | 436 | dbg_hid("alternative usage ignored\n"); |
dde5845a JK |
437 | return 0; |
438 | } | |
439 | ||
440 | if (item->size <= 2) | |
441 | data = (parser->global.usage_page << 16) + data; | |
442 | ||
443 | parser->local.usage_minimum = data; | |
444 | return 0; | |
445 | ||
446 | case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM: | |
447 | ||
448 | if (parser->local.delimiter_branch > 1) { | |
58037eb9 | 449 | dbg_hid("alternative usage ignored\n"); |
dde5845a JK |
450 | return 0; |
451 | } | |
452 | ||
453 | if (item->size <= 2) | |
454 | data = (parser->global.usage_page << 16) + data; | |
455 | ||
456 | for (n = parser->local.usage_minimum; n <= data; n++) | |
457 | if (hid_add_usage(parser, n)) { | |
58037eb9 | 458 | dbg_hid("hid_add_usage failed\n"); |
dde5845a JK |
459 | return -1; |
460 | } | |
461 | return 0; | |
462 | ||
463 | default: | |
464 | ||
58037eb9 | 465 | dbg_hid("unknown local item tag 0x%x\n", item->tag); |
dde5845a JK |
466 | return 0; |
467 | } | |
468 | return 0; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Process a main item. | |
473 | */ | |
474 | ||
475 | static int hid_parser_main(struct hid_parser *parser, struct hid_item *item) | |
476 | { | |
477 | __u32 data; | |
478 | int ret; | |
479 | ||
480 | data = item_udata(item); | |
481 | ||
482 | switch (item->tag) { | |
483 | case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION: | |
484 | ret = open_collection(parser, data & 0xff); | |
485 | break; | |
486 | case HID_MAIN_ITEM_TAG_END_COLLECTION: | |
487 | ret = close_collection(parser); | |
488 | break; | |
489 | case HID_MAIN_ITEM_TAG_INPUT: | |
490 | ret = hid_add_field(parser, HID_INPUT_REPORT, data); | |
491 | break; | |
492 | case HID_MAIN_ITEM_TAG_OUTPUT: | |
493 | ret = hid_add_field(parser, HID_OUTPUT_REPORT, data); | |
494 | break; | |
495 | case HID_MAIN_ITEM_TAG_FEATURE: | |
496 | ret = hid_add_field(parser, HID_FEATURE_REPORT, data); | |
497 | break; | |
498 | default: | |
58037eb9 | 499 | dbg_hid("unknown main item tag 0x%x\n", item->tag); |
dde5845a JK |
500 | ret = 0; |
501 | } | |
502 | ||
503 | memset(&parser->local, 0, sizeof(parser->local)); /* Reset the local parser environment */ | |
504 | ||
505 | return ret; | |
506 | } | |
507 | ||
508 | /* | |
509 | * Process a reserved item. | |
510 | */ | |
511 | ||
512 | static int hid_parser_reserved(struct hid_parser *parser, struct hid_item *item) | |
513 | { | |
58037eb9 | 514 | dbg_hid("reserved item type, tag 0x%x\n", item->tag); |
dde5845a JK |
515 | return 0; |
516 | } | |
517 | ||
518 | /* | |
519 | * Free a report and all registered fields. The field->usage and | |
520 | * field->value table's are allocated behind the field, so we need | |
521 | * only to free(field) itself. | |
522 | */ | |
523 | ||
524 | static void hid_free_report(struct hid_report *report) | |
525 | { | |
526 | unsigned n; | |
527 | ||
528 | for (n = 0; n < report->maxfield; n++) | |
529 | kfree(report->field[n]); | |
530 | kfree(report); | |
531 | } | |
532 | ||
533 | /* | |
534 | * Free a device structure, all reports, and all fields. | |
535 | */ | |
536 | ||
85cdaf52 | 537 | static void hid_device_release(struct device *dev) |
dde5845a | 538 | { |
85cdaf52 JS |
539 | struct hid_device *device = container_of(dev, struct hid_device, dev); |
540 | unsigned i, j; | |
dde5845a JK |
541 | |
542 | for (i = 0; i < HID_REPORT_TYPES; i++) { | |
543 | struct hid_report_enum *report_enum = device->report_enum + i; | |
544 | ||
545 | for (j = 0; j < 256; j++) { | |
546 | struct hid_report *report = report_enum->report_id_hash[j]; | |
547 | if (report) | |
548 | hid_free_report(report); | |
549 | } | |
550 | } | |
551 | ||
552 | kfree(device->rdesc); | |
767fe787 | 553 | kfree(device->collection); |
dde5845a JK |
554 | kfree(device); |
555 | } | |
556 | ||
557 | /* | |
558 | * Fetch a report description item from the data stream. We support long | |
559 | * items, though they are not used yet. | |
560 | */ | |
561 | ||
562 | static u8 *fetch_item(__u8 *start, __u8 *end, struct hid_item *item) | |
563 | { | |
564 | u8 b; | |
565 | ||
566 | if ((end - start) <= 0) | |
567 | return NULL; | |
568 | ||
569 | b = *start++; | |
570 | ||
571 | item->type = (b >> 2) & 3; | |
572 | item->tag = (b >> 4) & 15; | |
573 | ||
574 | if (item->tag == HID_ITEM_TAG_LONG) { | |
575 | ||
576 | item->format = HID_ITEM_FORMAT_LONG; | |
577 | ||
578 | if ((end - start) < 2) | |
579 | return NULL; | |
580 | ||
581 | item->size = *start++; | |
582 | item->tag = *start++; | |
583 | ||
584 | if ((end - start) < item->size) | |
585 | return NULL; | |
586 | ||
587 | item->data.longdata = start; | |
588 | start += item->size; | |
589 | return start; | |
590 | } | |
591 | ||
592 | item->format = HID_ITEM_FORMAT_SHORT; | |
593 | item->size = b & 3; | |
594 | ||
595 | switch (item->size) { | |
596 | ||
597 | case 0: | |
598 | return start; | |
599 | ||
600 | case 1: | |
601 | if ((end - start) < 1) | |
602 | return NULL; | |
603 | item->data.u8 = *start++; | |
604 | return start; | |
605 | ||
606 | case 2: | |
607 | if ((end - start) < 2) | |
608 | return NULL; | |
c105068f | 609 | item->data.u16 = get_unaligned_le16(start); |
dde5845a JK |
610 | start = (__u8 *)((__le16 *)start + 1); |
611 | return start; | |
612 | ||
613 | case 3: | |
614 | item->size++; | |
615 | if ((end - start) < 4) | |
616 | return NULL; | |
c105068f | 617 | item->data.u32 = get_unaligned_le32(start); |
dde5845a JK |
618 | start = (__u8 *)((__le32 *)start + 1); |
619 | return start; | |
620 | } | |
621 | ||
622 | return NULL; | |
623 | } | |
624 | ||
85cdaf52 JS |
625 | /** |
626 | * hid_parse_report - parse device report | |
627 | * | |
628 | * @device: hid device | |
629 | * @start: report start | |
630 | * @size: report size | |
631 | * | |
dde5845a JK |
632 | * Parse a report description into a hid_device structure. Reports are |
633 | * enumerated, fields are attached to these reports. | |
85cdaf52 | 634 | * 0 returned on success, otherwise nonzero error value. |
dde5845a | 635 | */ |
85cdaf52 JS |
636 | int hid_parse_report(struct hid_device *device, __u8 *start, |
637 | unsigned size) | |
dde5845a | 638 | { |
dde5845a JK |
639 | struct hid_parser *parser; |
640 | struct hid_item item; | |
641 | __u8 *end; | |
85cdaf52 | 642 | int ret; |
dde5845a JK |
643 | static int (*dispatch_type[])(struct hid_parser *parser, |
644 | struct hid_item *item) = { | |
645 | hid_parser_main, | |
646 | hid_parser_global, | |
647 | hid_parser_local, | |
648 | hid_parser_reserved | |
649 | }; | |
650 | ||
85cdaf52 JS |
651 | device->rdesc = kmalloc(size, GFP_KERNEL); |
652 | if (device->rdesc == NULL) | |
653 | return -ENOMEM; | |
dde5845a JK |
654 | memcpy(device->rdesc, start, size); |
655 | device->rsize = size; | |
656 | ||
85cdaf52 JS |
657 | parser = vmalloc(sizeof(struct hid_parser)); |
658 | if (!parser) { | |
659 | ret = -ENOMEM; | |
660 | goto err; | |
dde5845a | 661 | } |
85cdaf52 | 662 | |
47a80edb | 663 | memset(parser, 0, sizeof(struct hid_parser)); |
dde5845a JK |
664 | parser->device = device; |
665 | ||
666 | end = start + size; | |
85cdaf52 | 667 | ret = -EINVAL; |
dde5845a JK |
668 | while ((start = fetch_item(start, end, &item)) != NULL) { |
669 | ||
670 | if (item.format != HID_ITEM_FORMAT_SHORT) { | |
58037eb9 | 671 | dbg_hid("unexpected long global item\n"); |
85cdaf52 | 672 | goto err; |
dde5845a JK |
673 | } |
674 | ||
675 | if (dispatch_type[item.type](parser, &item)) { | |
58037eb9 | 676 | dbg_hid("item %u %u %u %u parsing failed\n", |
dde5845a | 677 | item.format, (unsigned)item.size, (unsigned)item.type, (unsigned)item.tag); |
85cdaf52 | 678 | goto err; |
dde5845a JK |
679 | } |
680 | ||
681 | if (start == end) { | |
682 | if (parser->collection_stack_ptr) { | |
58037eb9 | 683 | dbg_hid("unbalanced collection at end of report description\n"); |
85cdaf52 | 684 | goto err; |
dde5845a JK |
685 | } |
686 | if (parser->local.delimiter_depth) { | |
58037eb9 | 687 | dbg_hid("unbalanced delimiter at end of report description\n"); |
85cdaf52 | 688 | goto err; |
dde5845a | 689 | } |
47a80edb | 690 | vfree(parser); |
85cdaf52 | 691 | return 0; |
dde5845a JK |
692 | } |
693 | } | |
694 | ||
58037eb9 | 695 | dbg_hid("item fetching failed at offset %d\n", (int)(end - start)); |
85cdaf52 | 696 | err: |
47a80edb | 697 | vfree(parser); |
85cdaf52 | 698 | return ret; |
dde5845a | 699 | } |
229695e5 | 700 | EXPORT_SYMBOL_GPL(hid_parse_report); |
dde5845a JK |
701 | |
702 | /* | |
703 | * Convert a signed n-bit integer to signed 32-bit integer. Common | |
704 | * cases are done through the compiler, the screwed things has to be | |
705 | * done by hand. | |
706 | */ | |
707 | ||
708 | static s32 snto32(__u32 value, unsigned n) | |
709 | { | |
710 | switch (n) { | |
711 | case 8: return ((__s8)value); | |
712 | case 16: return ((__s16)value); | |
713 | case 32: return ((__s32)value); | |
714 | } | |
715 | return value & (1 << (n - 1)) ? value | (-1 << n) : value; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Convert a signed 32-bit integer to a signed n-bit integer. | |
720 | */ | |
721 | ||
722 | static u32 s32ton(__s32 value, unsigned n) | |
723 | { | |
724 | s32 a = value >> (n - 1); | |
725 | if (a && a != -1) | |
726 | return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1; | |
727 | return value & ((1 << n) - 1); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Extract/implement a data field from/to a little endian report (bit array). | |
732 | * | |
733 | * Code sort-of follows HID spec: | |
734 | * http://www.usb.org/developers/devclass_docs/HID1_11.pdf | |
735 | * | |
736 | * While the USB HID spec allows unlimited length bit fields in "report | |
737 | * descriptors", most devices never use more than 16 bits. | |
738 | * One model of UPS is claimed to report "LINEV" as a 32-bit field. | |
739 | * Search linux-kernel and linux-usb-devel archives for "hid-core extract". | |
740 | */ | |
741 | ||
742 | static __inline__ __u32 extract(__u8 *report, unsigned offset, unsigned n) | |
743 | { | |
744 | u64 x; | |
745 | ||
c4124c9b JK |
746 | if (n > 32) |
747 | printk(KERN_WARNING "HID: extract() called with n (%d) > 32! (%s)\n", | |
748 | n, current->comm); | |
dde5845a JK |
749 | |
750 | report += offset >> 3; /* adjust byte index */ | |
229695e5 | 751 | offset &= 7; /* now only need bit offset into one byte */ |
c105068f | 752 | x = get_unaligned_le64(report); |
229695e5 | 753 | x = (x >> offset) & ((1ULL << n) - 1); /* extract bit field */ |
dde5845a JK |
754 | return (u32) x; |
755 | } | |
756 | ||
757 | /* | |
758 | * "implement" : set bits in a little endian bit stream. | |
759 | * Same concepts as "extract" (see comments above). | |
760 | * The data mangled in the bit stream remains in little endian | |
761 | * order the whole time. It make more sense to talk about | |
762 | * endianness of register values by considering a register | |
763 | * a "cached" copy of the little endiad bit stream. | |
764 | */ | |
765 | static __inline__ void implement(__u8 *report, unsigned offset, unsigned n, __u32 value) | |
766 | { | |
6f0168d2 | 767 | u64 x; |
dde5845a JK |
768 | u64 m = (1ULL << n) - 1; |
769 | ||
c4124c9b JK |
770 | if (n > 32) |
771 | printk(KERN_WARNING "HID: implement() called with n (%d) > 32! (%s)\n", | |
772 | n, current->comm); | |
dde5845a | 773 | |
c4124c9b JK |
774 | if (value > m) |
775 | printk(KERN_WARNING "HID: implement() called with too large value %d! (%s)\n", | |
776 | value, current->comm); | |
dde5845a JK |
777 | WARN_ON(value > m); |
778 | value &= m; | |
779 | ||
780 | report += offset >> 3; | |
781 | offset &= 7; | |
782 | ||
6f0168d2 HH |
783 | x = get_unaligned_le64(report); |
784 | x &= ~(m << offset); | |
785 | x |= ((u64)value) << offset; | |
786 | put_unaligned_le64(x, report); | |
dde5845a JK |
787 | } |
788 | ||
789 | /* | |
790 | * Search an array for a value. | |
791 | */ | |
792 | ||
793 | static __inline__ int search(__s32 *array, __s32 value, unsigned n) | |
794 | { | |
795 | while (n--) { | |
796 | if (*array++ == value) | |
797 | return 0; | |
798 | } | |
799 | return -1; | |
800 | } | |
801 | ||
85cdaf52 JS |
802 | /** |
803 | * hid_match_report - check if driver's raw_event should be called | |
804 | * | |
805 | * @hid: hid device | |
806 | * @report_type: type to match against | |
807 | * | |
808 | * compare hid->driver->report_table->report_type to report->type | |
809 | */ | |
810 | static int hid_match_report(struct hid_device *hid, struct hid_report *report) | |
dde5845a | 811 | { |
85cdaf52 JS |
812 | const struct hid_report_id *id = hid->driver->report_table; |
813 | ||
814 | if (!id) /* NULL means all */ | |
815 | return 1; | |
816 | ||
817 | for (; id->report_type != HID_TERMINATOR; id++) | |
818 | if (id->report_type == HID_ANY_ID || | |
819 | id->report_type == report->type) | |
820 | return 1; | |
821 | return 0; | |
822 | } | |
823 | ||
824 | /** | |
825 | * hid_match_usage - check if driver's event should be called | |
826 | * | |
827 | * @hid: hid device | |
828 | * @usage: usage to match against | |
829 | * | |
830 | * compare hid->driver->usage_table->usage_{type,code} to | |
831 | * usage->usage_{type,code} | |
832 | */ | |
833 | static int hid_match_usage(struct hid_device *hid, struct hid_usage *usage) | |
834 | { | |
835 | const struct hid_usage_id *id = hid->driver->usage_table; | |
836 | ||
837 | if (!id) /* NULL means all */ | |
838 | return 1; | |
839 | ||
840 | for (; id->usage_type != HID_ANY_ID - 1; id++) | |
841 | if ((id->usage_hid == HID_ANY_ID || | |
842 | id->usage_hid == usage->hid) && | |
843 | (id->usage_type == HID_ANY_ID || | |
844 | id->usage_type == usage->type) && | |
845 | (id->usage_code == HID_ANY_ID || | |
846 | id->usage_code == usage->code)) | |
847 | return 1; | |
848 | return 0; | |
849 | } | |
850 | ||
851 | static void hid_process_event(struct hid_device *hid, struct hid_field *field, | |
852 | struct hid_usage *usage, __s32 value, int interrupt) | |
853 | { | |
854 | struct hid_driver *hdrv = hid->driver; | |
855 | int ret; | |
856 | ||
dde5845a | 857 | hid_dump_input(usage, value); |
85cdaf52 JS |
858 | |
859 | if (hdrv && hdrv->event && hid_match_usage(hid, usage)) { | |
860 | ret = hdrv->event(hid, field, usage, value); | |
861 | if (ret != 0) { | |
862 | if (ret < 0) | |
863 | dbg_hid("%s's event failed with %d\n", | |
864 | hdrv->name, ret); | |
865 | return; | |
866 | } | |
867 | } | |
868 | ||
dde5845a JK |
869 | if (hid->claimed & HID_CLAIMED_INPUT) |
870 | hidinput_hid_event(hid, field, usage, value); | |
aa938f79 JK |
871 | if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt && hid->hiddev_hid_event) |
872 | hid->hiddev_hid_event(hid, field, usage, value); | |
dde5845a JK |
873 | } |
874 | ||
875 | /* | |
876 | * Analyse a received field, and fetch the data from it. The field | |
877 | * content is stored for next report processing (we do differential | |
878 | * reporting to the layer). | |
879 | */ | |
880 | ||
abdff0f7 AB |
881 | static void hid_input_field(struct hid_device *hid, struct hid_field *field, |
882 | __u8 *data, int interrupt) | |
dde5845a JK |
883 | { |
884 | unsigned n; | |
885 | unsigned count = field->report_count; | |
886 | unsigned offset = field->report_offset; | |
887 | unsigned size = field->report_size; | |
888 | __s32 min = field->logical_minimum; | |
889 | __s32 max = field->logical_maximum; | |
890 | __s32 *value; | |
891 | ||
892 | if (!(value = kmalloc(sizeof(__s32) * count, GFP_ATOMIC))) | |
893 | return; | |
894 | ||
895 | for (n = 0; n < count; n++) { | |
896 | ||
897 | value[n] = min < 0 ? snto32(extract(data, offset + n * size, size), size) : | |
898 | extract(data, offset + n * size, size); | |
899 | ||
900 | if (!(field->flags & HID_MAIN_ITEM_VARIABLE) /* Ignore report if ErrorRollOver */ | |
901 | && value[n] >= min && value[n] <= max | |
902 | && field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) | |
903 | goto exit; | |
904 | } | |
905 | ||
906 | for (n = 0; n < count; n++) { | |
907 | ||
908 | if (HID_MAIN_ITEM_VARIABLE & field->flags) { | |
909 | hid_process_event(hid, field, &field->usage[n], value[n], interrupt); | |
910 | continue; | |
911 | } | |
912 | ||
913 | if (field->value[n] >= min && field->value[n] <= max | |
914 | && field->usage[field->value[n] - min].hid | |
915 | && search(value, field->value[n], count)) | |
916 | hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt); | |
917 | ||
918 | if (value[n] >= min && value[n] <= max | |
919 | && field->usage[value[n] - min].hid | |
920 | && search(field->value, value[n], count)) | |
921 | hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt); | |
922 | } | |
923 | ||
924 | memcpy(field->value, value, count * sizeof(__s32)); | |
925 | exit: | |
926 | kfree(value); | |
927 | } | |
dde5845a JK |
928 | |
929 | /* | |
930 | * Output the field into the report. | |
931 | */ | |
932 | ||
933 | static void hid_output_field(struct hid_field *field, __u8 *data) | |
934 | { | |
935 | unsigned count = field->report_count; | |
936 | unsigned offset = field->report_offset; | |
937 | unsigned size = field->report_size; | |
46386b58 | 938 | unsigned bitsused = offset + count * size; |
dde5845a JK |
939 | unsigned n; |
940 | ||
46386b58 SB |
941 | /* make sure the unused bits in the last byte are zeros */ |
942 | if (count > 0 && size > 0 && (bitsused % 8) != 0) | |
943 | data[(bitsused-1)/8] &= (1 << (bitsused % 8)) - 1; | |
944 | ||
dde5845a JK |
945 | for (n = 0; n < count; n++) { |
946 | if (field->logical_minimum < 0) /* signed values */ | |
947 | implement(data, offset + n * size, size, s32ton(field->value[n], size)); | |
948 | else /* unsigned values */ | |
949 | implement(data, offset + n * size, size, field->value[n]); | |
950 | } | |
951 | } | |
952 | ||
953 | /* | |
954 | * Create a report. | |
955 | */ | |
956 | ||
229695e5 | 957 | void hid_output_report(struct hid_report *report, __u8 *data) |
dde5845a JK |
958 | { |
959 | unsigned n; | |
960 | ||
961 | if (report->id > 0) | |
962 | *data++ = report->id; | |
963 | ||
964 | for (n = 0; n < report->maxfield; n++) | |
965 | hid_output_field(report->field[n], data); | |
966 | } | |
229695e5 | 967 | EXPORT_SYMBOL_GPL(hid_output_report); |
dde5845a JK |
968 | |
969 | /* | |
970 | * Set a field value. The report this field belongs to has to be | |
971 | * created and transferred to the device, to set this value in the | |
972 | * device. | |
973 | */ | |
974 | ||
975 | int hid_set_field(struct hid_field *field, unsigned offset, __s32 value) | |
976 | { | |
977 | unsigned size = field->report_size; | |
978 | ||
979 | hid_dump_input(field->usage + offset, value); | |
980 | ||
981 | if (offset >= field->report_count) { | |
58037eb9 | 982 | dbg_hid("offset (%d) exceeds report_count (%d)\n", offset, field->report_count); |
dde5845a JK |
983 | hid_dump_field(field, 8); |
984 | return -1; | |
985 | } | |
986 | if (field->logical_minimum < 0) { | |
987 | if (value != snto32(s32ton(value, size), size)) { | |
58037eb9 | 988 | dbg_hid("value %d is out of range\n", value); |
dde5845a JK |
989 | return -1; |
990 | } | |
991 | } | |
992 | field->value[offset] = value; | |
993 | return 0; | |
994 | } | |
229695e5 | 995 | EXPORT_SYMBOL_GPL(hid_set_field); |
dde5845a | 996 | |
85cdaf52 JS |
997 | static struct hid_report *hid_get_report(struct hid_report_enum *report_enum, |
998 | const u8 *data) | |
aa8de2f0 | 999 | { |
aa8de2f0 | 1000 | struct hid_report *report; |
85cdaf52 | 1001 | unsigned int n = 0; /* Normally report number is 0 */ |
aa8de2f0 | 1002 | |
85cdaf52 JS |
1003 | /* Device uses numbered reports, data[0] is report number */ |
1004 | if (report_enum->numbered) | |
1005 | n = *data; | |
aa8de2f0 | 1006 | |
85cdaf52 JS |
1007 | report = report_enum->report_id_hash[n]; |
1008 | if (report == NULL) | |
1009 | dbg_hid("undefined report_id %u received\n", n); | |
aa8de2f0 | 1010 | |
85cdaf52 JS |
1011 | return report; |
1012 | } | |
aa8de2f0 | 1013 | |
85cdaf52 JS |
1014 | void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size, |
1015 | int interrupt) | |
1016 | { | |
1017 | struct hid_report_enum *report_enum = hid->report_enum + type; | |
1018 | struct hid_report *report; | |
1019 | unsigned int a; | |
1020 | int rsize, csize = size; | |
1021 | u8 *cdata = data; | |
aa8de2f0 | 1022 | |
85cdaf52 JS |
1023 | report = hid_get_report(report_enum, data); |
1024 | if (!report) | |
1025 | return; | |
aa8de2f0 | 1026 | |
85cdaf52 JS |
1027 | if (report_enum->numbered) { |
1028 | cdata++; | |
1029 | csize--; | |
aa8de2f0 JK |
1030 | } |
1031 | ||
1032 | rsize = ((report->size - 1) >> 3) + 1; | |
1033 | ||
85cdaf52 JS |
1034 | if (csize < rsize) { |
1035 | dbg_hid("report %d is too short, (%d < %d)\n", report->id, | |
1036 | csize, rsize); | |
1037 | memset(cdata + csize, 0, rsize - csize); | |
aa8de2f0 JK |
1038 | } |
1039 | ||
1040 | if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event) | |
1041 | hid->hiddev_report_event(hid, report); | |
b54ec3c1 JK |
1042 | if (hid->claimed & HID_CLAIMED_HIDRAW) { |
1043 | /* numbered reports need to be passed with the report num */ | |
1044 | if (report_enum->numbered) | |
1045 | hidraw_report_event(hid, data - 1, size + 1); | |
1046 | else | |
1047 | hidraw_report_event(hid, data, size); | |
1048 | } | |
aa8de2f0 | 1049 | |
85cdaf52 JS |
1050 | for (a = 0; a < report->maxfield; a++) |
1051 | hid_input_field(hid, report->field[a], cdata, interrupt); | |
aa8de2f0 JK |
1052 | |
1053 | if (hid->claimed & HID_CLAIMED_INPUT) | |
1054 | hidinput_report_event(hid, report); | |
85cdaf52 JS |
1055 | } |
1056 | EXPORT_SYMBOL_GPL(hid_report_raw_event); | |
1057 | ||
1058 | /** | |
1059 | * hid_input_report - report data from lower layer (usb, bt...) | |
1060 | * | |
1061 | * @hid: hid device | |
1062 | * @type: HID report type (HID_*_REPORT) | |
1063 | * @data: report contents | |
1064 | * @size: size of data parameter | |
1065 | * @interrupt: called from atomic? | |
1066 | * | |
1067 | * This is data entry for lower layers. | |
1068 | */ | |
1069 | int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int interrupt) | |
1070 | { | |
1071 | struct hid_report_enum *report_enum = hid->report_enum + type; | |
1072 | struct hid_driver *hdrv = hid->driver; | |
1073 | struct hid_report *report; | |
1074 | unsigned int i; | |
1075 | int ret; | |
1076 | ||
1077 | if (!hid || !hid->driver) | |
1078 | return -ENODEV; | |
1079 | ||
1080 | if (!size) { | |
1081 | dbg_hid("empty report\n"); | |
1082 | return -1; | |
1083 | } | |
1084 | ||
1085 | dbg_hid("report (size %u) (%snumbered)\n", size, report_enum->numbered ? "" : "un"); | |
1086 | ||
1087 | report = hid_get_report(report_enum, data); | |
1088 | if (!report) | |
1089 | return -1; | |
1090 | ||
1091 | /* dump the report */ | |
1092 | dbg_hid("report %d (size %u) = ", report->id, size); | |
1093 | for (i = 0; i < size; i++) | |
1094 | dbg_hid_line(" %02x", data[i]); | |
1095 | dbg_hid_line("\n"); | |
1096 | ||
1097 | if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) { | |
1098 | ret = hdrv->raw_event(hid, report, data, size); | |
1099 | if (ret != 0) | |
1100 | return ret < 0 ? ret : 0; | |
1101 | } | |
1102 | ||
1103 | hid_report_raw_event(hid, type, data, size, interrupt); | |
aa8de2f0 JK |
1104 | |
1105 | return 0; | |
1106 | } | |
1107 | EXPORT_SYMBOL_GPL(hid_input_report); | |
1108 | ||
85cdaf52 JS |
1109 | static bool hid_match_one_id(struct hid_device *hdev, |
1110 | const struct hid_device_id *id) | |
1111 | { | |
1112 | return id->bus == hdev->bus && | |
1113 | (id->vendor == HID_ANY_ID || id->vendor == hdev->vendor) && | |
1114 | (id->product == HID_ANY_ID || id->product == hdev->product); | |
1115 | } | |
1116 | ||
1117 | static const struct hid_device_id *hid_match_id(struct hid_device *hdev, | |
1118 | const struct hid_device_id *id) | |
1119 | { | |
1120 | for (; id->bus; id++) | |
1121 | if (hid_match_one_id(hdev, id)) | |
1122 | return id; | |
1123 | ||
1124 | return NULL; | |
1125 | } | |
1126 | ||
1127 | static const struct hid_device_id hid_blacklist[] = { | |
1128 | { } | |
1129 | }; | |
1130 | ||
1131 | static int hid_bus_match(struct device *dev, struct device_driver *drv) | |
1132 | { | |
1133 | struct hid_driver *hdrv = container_of(drv, struct hid_driver, driver); | |
1134 | struct hid_device *hdev = container_of(dev, struct hid_device, dev); | |
1135 | ||
1136 | if (!hid_match_id(hdev, hdrv->id_table)) | |
1137 | return 0; | |
1138 | ||
1139 | /* generic wants all non-blacklisted */ | |
1140 | if (!strncmp(hdrv->name, "generic-", 8)) | |
1141 | return !hid_match_id(hdev, hid_blacklist); | |
1142 | ||
1143 | return 1; | |
1144 | } | |
1145 | ||
1146 | static int hid_device_probe(struct device *dev) | |
1147 | { | |
1148 | struct hid_driver *hdrv = container_of(dev->driver, | |
1149 | struct hid_driver, driver); | |
1150 | struct hid_device *hdev = container_of(dev, struct hid_device, dev); | |
1151 | const struct hid_device_id *id; | |
1152 | int ret = 0; | |
1153 | ||
1154 | if (!hdev->driver) { | |
1155 | if (hdrv->probe) { | |
1156 | ret = -ENODEV; | |
1157 | ||
1158 | id = hid_match_id(hdev, hdrv->id_table); | |
1159 | if (id) | |
1160 | ret = hdrv->probe(hdev, id); | |
1161 | } | |
1162 | if (!ret) | |
1163 | hdev->driver = hdrv; | |
1164 | } | |
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | static int hid_device_remove(struct device *dev) | |
1169 | { | |
1170 | struct hid_device *hdev = container_of(dev, struct hid_device, dev); | |
1171 | struct hid_driver *hdrv = hdev->driver; | |
1172 | ||
1173 | if (hdrv) { | |
1174 | if (hdrv->remove) | |
1175 | hdrv->remove(hdev); | |
1176 | hdev->driver = NULL; | |
1177 | } | |
1178 | ||
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static int hid_uevent(struct device *dev, struct kobj_uevent_env *env) | |
1183 | { | |
1184 | struct hid_device *hdev = container_of(dev, struct hid_device, dev); | |
1185 | ||
1186 | if (add_uevent_var(env, "HID_ID=%04X:%08X:%08X", | |
1187 | hdev->bus, hdev->vendor, hdev->product)) | |
1188 | return -ENOMEM; | |
1189 | ||
1190 | if (add_uevent_var(env, "HID_NAME=%s", hdev->name)) | |
1191 | return -ENOMEM; | |
1192 | ||
1193 | if (add_uevent_var(env, "HID_PHYS=%s", hdev->phys)) | |
1194 | return -ENOMEM; | |
1195 | ||
1196 | if (add_uevent_var(env, "HID_UNIQ=%s", hdev->uniq)) | |
1197 | return -ENOMEM; | |
1198 | ||
1199 | if (add_uevent_var(env, "MODALIAS=hid:b%04Xv%08Xp%08X", | |
1200 | hdev->bus, hdev->vendor, hdev->product)) | |
1201 | return -ENOMEM; | |
1202 | ||
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | static struct bus_type hid_bus_type = { | |
1207 | .name = "hid", | |
1208 | .match = hid_bus_match, | |
1209 | .probe = hid_device_probe, | |
1210 | .remove = hid_device_remove, | |
1211 | .uevent = hid_uevent, | |
1212 | }; | |
1213 | ||
1214 | int hid_add_device(struct hid_device *hdev) | |
1215 | { | |
1216 | static atomic_t id = ATOMIC_INIT(0); | |
1217 | int ret; | |
1218 | ||
1219 | if (WARN_ON(hdev->status & HID_STAT_ADDED)) | |
1220 | return -EBUSY; | |
1221 | ||
1222 | /* XXX hack, any other cleaner solution < 20 bus_id bytes? */ | |
1223 | sprintf(hdev->dev.bus_id, "%04X:%04X:%04X.%04X", hdev->bus, | |
1224 | hdev->vendor, hdev->product, atomic_inc_return(&id)); | |
1225 | ||
1226 | ret = device_add(&hdev->dev); | |
1227 | if (!ret) | |
1228 | hdev->status |= HID_STAT_ADDED; | |
1229 | ||
1230 | return ret; | |
1231 | } | |
1232 | EXPORT_SYMBOL_GPL(hid_add_device); | |
1233 | ||
1234 | /** | |
1235 | * hid_allocate_device - allocate new hid device descriptor | |
1236 | * | |
1237 | * Allocate and initialize hid device, so that hid_destroy_device might be | |
1238 | * used to free it. | |
1239 | * | |
1240 | * New hid_device pointer is returned on success, otherwise ERR_PTR encoded | |
1241 | * error value. | |
1242 | */ | |
1243 | struct hid_device *hid_allocate_device(void) | |
1244 | { | |
1245 | struct hid_device *hdev; | |
1246 | unsigned int i; | |
1247 | int ret = -ENOMEM; | |
1248 | ||
1249 | hdev = kzalloc(sizeof(*hdev), GFP_KERNEL); | |
1250 | if (hdev == NULL) | |
1251 | return ERR_PTR(ret); | |
1252 | ||
1253 | device_initialize(&hdev->dev); | |
1254 | hdev->dev.release = hid_device_release; | |
1255 | hdev->dev.bus = &hid_bus_type; | |
1256 | ||
1257 | hdev->collection = kcalloc(HID_DEFAULT_NUM_COLLECTIONS, | |
1258 | sizeof(struct hid_collection), GFP_KERNEL); | |
1259 | if (hdev->collection == NULL) | |
1260 | goto err; | |
1261 | hdev->collection_size = HID_DEFAULT_NUM_COLLECTIONS; | |
1262 | ||
1263 | for (i = 0; i < HID_REPORT_TYPES; i++) | |
1264 | INIT_LIST_HEAD(&hdev->report_enum[i].report_list); | |
1265 | ||
1266 | return hdev; | |
1267 | err: | |
1268 | put_device(&hdev->dev); | |
1269 | return ERR_PTR(ret); | |
1270 | } | |
1271 | EXPORT_SYMBOL_GPL(hid_allocate_device); | |
1272 | ||
1273 | static void hid_remove_device(struct hid_device *hdev) | |
1274 | { | |
1275 | if (hdev->status & HID_STAT_ADDED) { | |
1276 | device_del(&hdev->dev); | |
1277 | hdev->status &= ~HID_STAT_ADDED; | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | /** | |
1282 | * hid_destroy_device - free previously allocated device | |
1283 | * | |
1284 | * @hdev: hid device | |
1285 | * | |
1286 | * If you allocate hid_device through hid_allocate_device, you should ever | |
1287 | * free by this function. | |
1288 | */ | |
1289 | void hid_destroy_device(struct hid_device *hdev) | |
1290 | { | |
1291 | hid_remove_device(hdev); | |
1292 | put_device(&hdev->dev); | |
1293 | } | |
1294 | EXPORT_SYMBOL_GPL(hid_destroy_device); | |
1295 | ||
1296 | int __hid_register_driver(struct hid_driver *hdrv, struct module *owner, | |
1297 | const char *mod_name) | |
1298 | { | |
1299 | hdrv->driver.name = hdrv->name; | |
1300 | hdrv->driver.bus = &hid_bus_type; | |
1301 | hdrv->driver.owner = owner; | |
1302 | hdrv->driver.mod_name = mod_name; | |
1303 | ||
1304 | return driver_register(&hdrv->driver); | |
1305 | } | |
1306 | EXPORT_SYMBOL_GPL(__hid_register_driver); | |
1307 | ||
1308 | void hid_unregister_driver(struct hid_driver *hdrv) | |
1309 | { | |
1310 | driver_unregister(&hdrv->driver); | |
1311 | } | |
1312 | EXPORT_SYMBOL_GPL(hid_unregister_driver); | |
1313 | ||
86166b7b JK |
1314 | static int __init hid_init(void) |
1315 | { | |
85cdaf52 JS |
1316 | int ret; |
1317 | ||
1318 | ret = bus_register(&hid_bus_type); | |
1319 | if (ret) { | |
1320 | printk(KERN_ERR "HID: can't register hid bus\n"); | |
1321 | goto err; | |
1322 | } | |
1323 | ||
1324 | ret = hidraw_init(); | |
1325 | if (ret) | |
1326 | goto err_bus; | |
1327 | ||
1328 | return 0; | |
1329 | err_bus: | |
1330 | bus_unregister(&hid_bus_type); | |
1331 | err: | |
1332 | return ret; | |
86166b7b JK |
1333 | } |
1334 | ||
1335 | static void __exit hid_exit(void) | |
1336 | { | |
1337 | hidraw_exit(); | |
85cdaf52 | 1338 | bus_unregister(&hid_bus_type); |
86166b7b JK |
1339 | } |
1340 | ||
1341 | module_init(hid_init); | |
1342 | module_exit(hid_exit); | |
1343 | ||
aa938f79 JK |
1344 | MODULE_LICENSE(DRIVER_LICENSE); |
1345 |