Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 1 | /* |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 2 | * HID support for Linux |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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 |
Jiri Kosina | f142b3a4 | 2007-04-16 11:29:28 +0200 | [diff] [blame] | 7 | * Copyright (c) 2006-2007 Jiri Kosina |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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> |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 21 | #include <linux/list.h> |
| 22 | #include <linux/mm.h> |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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> |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 28 | #include <linux/vmalloc.h> |
Jiri Kosina | c4124c9 | 2007-11-30 11:12:58 +0100 | [diff] [blame] | 29 | #include <linux/sched.h> |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 30 | |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 31 | #include <linux/hid.h> |
| 32 | #include <linux/hiddev.h> |
Jiri Kosina | c080d89 | 2007-01-25 11:43:31 +0100 | [diff] [blame] | 33 | #include <linux/hid-debug.h> |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 34 | #include <linux/hidraw.h> |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 35 | |
| 36 | /* |
| 37 | * Version Information |
| 38 | */ |
| 39 | |
| 40 | #define DRIVER_VERSION "v2.6" |
Jiri Kosina | f142b3a4 | 2007-04-16 11:29:28 +0200 | [diff] [blame] | 41 | #define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik, Jiri Kosina" |
Jiri Kosina | 5314980 | 2007-01-09 13:24:25 +0100 | [diff] [blame] | 42 | #define DRIVER_DESC "HID core driver" |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 43 | #define DRIVER_LICENSE "GPL" |
| 44 | |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 45 | #ifdef CONFIG_HID_DEBUG |
| 46 | int hid_debug = 0; |
| 47 | module_param_named(debug, hid_debug, bool, 0600); |
| 48 | MODULE_PARM_DESC(debug, "Turn HID debugging mode on and off"); |
| 49 | EXPORT_SYMBOL_GPL(hid_debug); |
| 50 | #endif |
| 51 | |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 52 | /* |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 90 | dbg_hid("too many fields in report\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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); |
| 100 | field->value = (unsigned *)(field->usage + usages); |
| 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 118 | dbg_hid("collection stack overflow\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 126 | dbg_hid("failed to reallocate collection array\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 162 | dbg_hid("collection stack underflow\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 190 | dbg_hid("usage index exceeded\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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))) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 214 | dbg_hid("hid_register_report failed\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 215 | return -1; |
| 216 | } |
| 217 | |
| 218 | if (parser->global.logical_maximum < parser->global.logical_minimum) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 219 | dbg_hid("logical range invalid %d %d\n", parser->global.logical_minimum, parser->global.logical_maximum); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 299 | dbg_hid("global enviroment stack overflow\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 310 | dbg_hid("global enviroment stack underflow\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 354 | dbg_hid("invalid report_size %d\n", parser->global.report_size); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 361 | dbg_hid("invalid report_count %d\n", parser->global.report_count); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 368 | dbg_hid("report_id 0 is invalid\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 369 | return -1; |
| 370 | } |
| 371 | return 0; |
| 372 | |
| 373 | default: |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 374 | dbg_hid("unknown global tag 0x%x\n", item->tag); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 389 | dbg_hid("item data expected for local item\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 407 | dbg_hid("nested delimiters\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 408 | return -1; |
| 409 | } |
| 410 | parser->local.delimiter_depth++; |
| 411 | parser->local.delimiter_branch++; |
| 412 | } else { |
| 413 | if (parser->local.delimiter_depth < 1) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 414 | dbg_hid("bogus close delimiter\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 424 | dbg_hid("alternative usage ignored\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 436 | dbg_hid("alternative usage ignored\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 449 | dbg_hid("alternative usage ignored\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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)) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 458 | dbg_hid("hid_add_usage failed\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 459 | return -1; |
| 460 | } |
| 461 | return 0; |
| 462 | |
| 463 | default: |
| 464 | |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 465 | dbg_hid("unknown local item tag 0x%x\n", item->tag); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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: |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 499 | dbg_hid("unknown main item tag 0x%x\n", item->tag); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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 | { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 514 | dbg_hid("reserved item type, tag 0x%x\n", item->tag); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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 | |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 537 | void hid_free_device(struct hid_device *device) |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 538 | { |
| 539 | unsigned i,j; |
| 540 | |
| 541 | for (i = 0; i < HID_REPORT_TYPES; i++) { |
| 542 | struct hid_report_enum *report_enum = device->report_enum + i; |
| 543 | |
| 544 | for (j = 0; j < 256; j++) { |
| 545 | struct hid_report *report = report_enum->report_id_hash[j]; |
| 546 | if (report) |
| 547 | hid_free_report(report); |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | kfree(device->rdesc); |
Jiri Kosina | 767fe78 | 2007-01-24 23:05:07 +0100 | [diff] [blame] | 552 | kfree(device->collection); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 553 | kfree(device); |
| 554 | } |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 555 | EXPORT_SYMBOL_GPL(hid_free_device); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 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; |
| 609 | item->data.u16 = le16_to_cpu(get_unaligned((__le16*)start)); |
| 610 | start = (__u8 *)((__le16 *)start + 1); |
| 611 | return start; |
| 612 | |
| 613 | case 3: |
| 614 | item->size++; |
| 615 | if ((end - start) < 4) |
| 616 | return NULL; |
| 617 | item->data.u32 = le32_to_cpu(get_unaligned((__le32*)start)); |
| 618 | start = (__u8 *)((__le32 *)start + 1); |
| 619 | return start; |
| 620 | } |
| 621 | |
| 622 | return NULL; |
| 623 | } |
| 624 | |
| 625 | /* |
| 626 | * Parse a report description into a hid_device structure. Reports are |
| 627 | * enumerated, fields are attached to these reports. |
| 628 | */ |
| 629 | |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 630 | struct hid_device *hid_parse_report(__u8 *start, unsigned size) |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 631 | { |
| 632 | struct hid_device *device; |
| 633 | struct hid_parser *parser; |
| 634 | struct hid_item item; |
| 635 | __u8 *end; |
| 636 | unsigned i; |
| 637 | static int (*dispatch_type[])(struct hid_parser *parser, |
| 638 | struct hid_item *item) = { |
| 639 | hid_parser_main, |
| 640 | hid_parser_global, |
| 641 | hid_parser_local, |
| 642 | hid_parser_reserved |
| 643 | }; |
| 644 | |
| 645 | if (!(device = kzalloc(sizeof(struct hid_device), GFP_KERNEL))) |
| 646 | return NULL; |
| 647 | |
| 648 | if (!(device->collection = kzalloc(sizeof(struct hid_collection) * |
| 649 | HID_DEFAULT_NUM_COLLECTIONS, GFP_KERNEL))) { |
| 650 | kfree(device); |
| 651 | return NULL; |
| 652 | } |
| 653 | device->collection_size = HID_DEFAULT_NUM_COLLECTIONS; |
| 654 | |
| 655 | for (i = 0; i < HID_REPORT_TYPES; i++) |
| 656 | INIT_LIST_HEAD(&device->report_enum[i].report_list); |
| 657 | |
Ahmed S. Darwish | d6509c3 | 2007-01-06 15:18:52 +0200 | [diff] [blame] | 658 | if (!(device->rdesc = kmalloc(size, GFP_KERNEL))) { |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 659 | kfree(device->collection); |
| 660 | kfree(device); |
| 661 | return NULL; |
| 662 | } |
| 663 | memcpy(device->rdesc, start, size); |
| 664 | device->rsize = size; |
| 665 | |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 666 | if (!(parser = vmalloc(sizeof(struct hid_parser)))) { |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 667 | kfree(device->rdesc); |
| 668 | kfree(device->collection); |
| 669 | kfree(device); |
| 670 | return NULL; |
| 671 | } |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 672 | memset(parser, 0, sizeof(struct hid_parser)); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 673 | parser->device = device; |
| 674 | |
| 675 | end = start + size; |
| 676 | while ((start = fetch_item(start, end, &item)) != NULL) { |
| 677 | |
| 678 | if (item.format != HID_ITEM_FORMAT_SHORT) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 679 | dbg_hid("unexpected long global item\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 680 | hid_free_device(device); |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 681 | vfree(parser); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 682 | return NULL; |
| 683 | } |
| 684 | |
| 685 | if (dispatch_type[item.type](parser, &item)) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 686 | dbg_hid("item %u %u %u %u parsing failed\n", |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 687 | item.format, (unsigned)item.size, (unsigned)item.type, (unsigned)item.tag); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 688 | hid_free_device(device); |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 689 | vfree(parser); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 690 | return NULL; |
| 691 | } |
| 692 | |
| 693 | if (start == end) { |
| 694 | if (parser->collection_stack_ptr) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 695 | dbg_hid("unbalanced collection at end of report description\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 696 | hid_free_device(device); |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 697 | vfree(parser); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 698 | return NULL; |
| 699 | } |
| 700 | if (parser->local.delimiter_depth) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 701 | dbg_hid("unbalanced delimiter at end of report description\n"); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 702 | hid_free_device(device); |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 703 | vfree(parser); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 704 | return NULL; |
| 705 | } |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 706 | vfree(parser); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 707 | return device; |
| 708 | } |
| 709 | } |
| 710 | |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 711 | dbg_hid("item fetching failed at offset %d\n", (int)(end - start)); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 712 | hid_free_device(device); |
Jiri Kosina | 47a80ed | 2007-03-12 14:55:12 +0100 | [diff] [blame] | 713 | vfree(parser); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 714 | return NULL; |
| 715 | } |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 716 | EXPORT_SYMBOL_GPL(hid_parse_report); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 717 | |
| 718 | /* |
| 719 | * Convert a signed n-bit integer to signed 32-bit integer. Common |
| 720 | * cases are done through the compiler, the screwed things has to be |
| 721 | * done by hand. |
| 722 | */ |
| 723 | |
| 724 | static s32 snto32(__u32 value, unsigned n) |
| 725 | { |
| 726 | switch (n) { |
| 727 | case 8: return ((__s8)value); |
| 728 | case 16: return ((__s16)value); |
| 729 | case 32: return ((__s32)value); |
| 730 | } |
| 731 | return value & (1 << (n - 1)) ? value | (-1 << n) : value; |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * Convert a signed 32-bit integer to a signed n-bit integer. |
| 736 | */ |
| 737 | |
| 738 | static u32 s32ton(__s32 value, unsigned n) |
| 739 | { |
| 740 | s32 a = value >> (n - 1); |
| 741 | if (a && a != -1) |
| 742 | return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1; |
| 743 | return value & ((1 << n) - 1); |
| 744 | } |
| 745 | |
| 746 | /* |
| 747 | * Extract/implement a data field from/to a little endian report (bit array). |
| 748 | * |
| 749 | * Code sort-of follows HID spec: |
| 750 | * http://www.usb.org/developers/devclass_docs/HID1_11.pdf |
| 751 | * |
| 752 | * While the USB HID spec allows unlimited length bit fields in "report |
| 753 | * descriptors", most devices never use more than 16 bits. |
| 754 | * One model of UPS is claimed to report "LINEV" as a 32-bit field. |
| 755 | * Search linux-kernel and linux-usb-devel archives for "hid-core extract". |
| 756 | */ |
| 757 | |
| 758 | static __inline__ __u32 extract(__u8 *report, unsigned offset, unsigned n) |
| 759 | { |
| 760 | u64 x; |
| 761 | |
Jiri Kosina | c4124c9 | 2007-11-30 11:12:58 +0100 | [diff] [blame] | 762 | if (n > 32) |
| 763 | printk(KERN_WARNING "HID: extract() called with n (%d) > 32! (%s)\n", |
| 764 | n, current->comm); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 765 | |
| 766 | report += offset >> 3; /* adjust byte index */ |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 767 | offset &= 7; /* now only need bit offset into one byte */ |
Al Viro | b87496a | 2007-03-14 09:19:50 +0000 | [diff] [blame] | 768 | x = le64_to_cpu(get_unaligned((__le64 *) report)); |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 769 | x = (x >> offset) & ((1ULL << n) - 1); /* extract bit field */ |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 770 | return (u32) x; |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * "implement" : set bits in a little endian bit stream. |
| 775 | * Same concepts as "extract" (see comments above). |
| 776 | * The data mangled in the bit stream remains in little endian |
| 777 | * order the whole time. It make more sense to talk about |
| 778 | * endianness of register values by considering a register |
| 779 | * a "cached" copy of the little endiad bit stream. |
| 780 | */ |
| 781 | static __inline__ void implement(__u8 *report, unsigned offset, unsigned n, __u32 value) |
| 782 | { |
Al Viro | b87496a | 2007-03-14 09:19:50 +0000 | [diff] [blame] | 783 | __le64 x; |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 784 | u64 m = (1ULL << n) - 1; |
| 785 | |
Jiri Kosina | c4124c9 | 2007-11-30 11:12:58 +0100 | [diff] [blame] | 786 | if (n > 32) |
| 787 | printk(KERN_WARNING "HID: implement() called with n (%d) > 32! (%s)\n", |
| 788 | n, current->comm); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 789 | |
Jiri Kosina | c4124c9 | 2007-11-30 11:12:58 +0100 | [diff] [blame] | 790 | if (value > m) |
| 791 | printk(KERN_WARNING "HID: implement() called with too large value %d! (%s)\n", |
| 792 | value, current->comm); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 793 | WARN_ON(value > m); |
| 794 | value &= m; |
| 795 | |
| 796 | report += offset >> 3; |
| 797 | offset &= 7; |
| 798 | |
Al Viro | b87496a | 2007-03-14 09:19:50 +0000 | [diff] [blame] | 799 | x = get_unaligned((__le64 *)report); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 800 | x &= cpu_to_le64(~(m << offset)); |
| 801 | x |= cpu_to_le64(((u64) value) << offset); |
Al Viro | b87496a | 2007-03-14 09:19:50 +0000 | [diff] [blame] | 802 | put_unaligned(x, (__le64 *) report); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | /* |
| 806 | * Search an array for a value. |
| 807 | */ |
| 808 | |
| 809 | static __inline__ int search(__s32 *array, __s32 value, unsigned n) |
| 810 | { |
| 811 | while (n--) { |
| 812 | if (*array++ == value) |
| 813 | return 0; |
| 814 | } |
| 815 | return -1; |
| 816 | } |
| 817 | |
| 818 | static void hid_process_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value, int interrupt) |
| 819 | { |
| 820 | hid_dump_input(usage, value); |
| 821 | if (hid->claimed & HID_CLAIMED_INPUT) |
| 822 | hidinput_hid_event(hid, field, usage, value); |
Jiri Kosina | aa938f7 | 2006-12-08 18:41:10 +0100 | [diff] [blame] | 823 | if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt && hid->hiddev_hid_event) |
| 824 | hid->hiddev_hid_event(hid, field, usage, value); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 825 | } |
| 826 | |
| 827 | /* |
| 828 | * Analyse a received field, and fetch the data from it. The field |
| 829 | * content is stored for next report processing (we do differential |
| 830 | * reporting to the layer). |
| 831 | */ |
| 832 | |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 833 | void hid_input_field(struct hid_device *hid, struct hid_field *field, __u8 *data, int interrupt) |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 834 | { |
| 835 | unsigned n; |
| 836 | unsigned count = field->report_count; |
| 837 | unsigned offset = field->report_offset; |
| 838 | unsigned size = field->report_size; |
| 839 | __s32 min = field->logical_minimum; |
| 840 | __s32 max = field->logical_maximum; |
| 841 | __s32 *value; |
| 842 | |
| 843 | if (!(value = kmalloc(sizeof(__s32) * count, GFP_ATOMIC))) |
| 844 | return; |
| 845 | |
| 846 | for (n = 0; n < count; n++) { |
| 847 | |
| 848 | value[n] = min < 0 ? snto32(extract(data, offset + n * size, size), size) : |
| 849 | extract(data, offset + n * size, size); |
| 850 | |
| 851 | if (!(field->flags & HID_MAIN_ITEM_VARIABLE) /* Ignore report if ErrorRollOver */ |
| 852 | && value[n] >= min && value[n] <= max |
| 853 | && field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1) |
| 854 | goto exit; |
| 855 | } |
| 856 | |
| 857 | for (n = 0; n < count; n++) { |
| 858 | |
| 859 | if (HID_MAIN_ITEM_VARIABLE & field->flags) { |
| 860 | hid_process_event(hid, field, &field->usage[n], value[n], interrupt); |
| 861 | continue; |
| 862 | } |
| 863 | |
| 864 | if (field->value[n] >= min && field->value[n] <= max |
| 865 | && field->usage[field->value[n] - min].hid |
| 866 | && search(value, field->value[n], count)) |
| 867 | hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt); |
| 868 | |
| 869 | if (value[n] >= min && value[n] <= max |
| 870 | && field->usage[value[n] - min].hid |
| 871 | && search(field->value, value[n], count)) |
| 872 | hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt); |
| 873 | } |
| 874 | |
| 875 | memcpy(field->value, value, count * sizeof(__s32)); |
| 876 | exit: |
| 877 | kfree(value); |
| 878 | } |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 879 | EXPORT_SYMBOL_GPL(hid_input_field); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 880 | |
| 881 | /* |
| 882 | * Output the field into the report. |
| 883 | */ |
| 884 | |
| 885 | static void hid_output_field(struct hid_field *field, __u8 *data) |
| 886 | { |
| 887 | unsigned count = field->report_count; |
| 888 | unsigned offset = field->report_offset; |
| 889 | unsigned size = field->report_size; |
Simon Budig | 46386b5 | 2007-03-12 13:52:04 +0100 | [diff] [blame] | 890 | unsigned bitsused = offset + count * size; |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 891 | unsigned n; |
| 892 | |
Simon Budig | 46386b5 | 2007-03-12 13:52:04 +0100 | [diff] [blame] | 893 | /* make sure the unused bits in the last byte are zeros */ |
| 894 | if (count > 0 && size > 0 && (bitsused % 8) != 0) |
| 895 | data[(bitsused-1)/8] &= (1 << (bitsused % 8)) - 1; |
| 896 | |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 897 | for (n = 0; n < count; n++) { |
| 898 | if (field->logical_minimum < 0) /* signed values */ |
| 899 | implement(data, offset + n * size, size, s32ton(field->value[n], size)); |
| 900 | else /* unsigned values */ |
| 901 | implement(data, offset + n * size, size, field->value[n]); |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * Create a report. |
| 907 | */ |
| 908 | |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 909 | void hid_output_report(struct hid_report *report, __u8 *data) |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 910 | { |
| 911 | unsigned n; |
| 912 | |
| 913 | if (report->id > 0) |
| 914 | *data++ = report->id; |
| 915 | |
| 916 | for (n = 0; n < report->maxfield; n++) |
| 917 | hid_output_field(report->field[n], data); |
| 918 | } |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 919 | EXPORT_SYMBOL_GPL(hid_output_report); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 920 | |
| 921 | /* |
| 922 | * Set a field value. The report this field belongs to has to be |
| 923 | * created and transferred to the device, to set this value in the |
| 924 | * device. |
| 925 | */ |
| 926 | |
| 927 | int hid_set_field(struct hid_field *field, unsigned offset, __s32 value) |
| 928 | { |
| 929 | unsigned size = field->report_size; |
| 930 | |
| 931 | hid_dump_input(field->usage + offset, value); |
| 932 | |
| 933 | if (offset >= field->report_count) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 934 | dbg_hid("offset (%d) exceeds report_count (%d)\n", offset, field->report_count); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 935 | hid_dump_field(field, 8); |
| 936 | return -1; |
| 937 | } |
| 938 | if (field->logical_minimum < 0) { |
| 939 | if (value != snto32(s32ton(value, size), size)) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 940 | dbg_hid("value %d is out of range\n", value); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 941 | return -1; |
| 942 | } |
| 943 | } |
| 944 | field->value[offset] = value; |
| 945 | return 0; |
| 946 | } |
Jiri Kosina | 229695e | 2006-12-08 18:40:53 +0100 | [diff] [blame] | 947 | EXPORT_SYMBOL_GPL(hid_set_field); |
Jiri Kosina | dde5845 | 2006-12-08 18:40:44 +0100 | [diff] [blame] | 948 | |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 949 | int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int interrupt) |
| 950 | { |
| 951 | struct hid_report_enum *report_enum = hid->report_enum + type; |
| 952 | struct hid_report *report; |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 953 | int n, rsize, i; |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 954 | |
| 955 | if (!hid) |
| 956 | return -ENODEV; |
| 957 | |
| 958 | if (!size) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 959 | dbg_hid("empty report\n"); |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 960 | return -1; |
| 961 | } |
| 962 | |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 963 | dbg_hid("report (size %u) (%snumbered)\n", size, report_enum->numbered ? "" : "un"); |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 964 | |
| 965 | n = 0; /* Normally report number is 0 */ |
| 966 | if (report_enum->numbered) { /* Device uses numbered reports, data[0] is report number */ |
| 967 | n = *data++; |
| 968 | size--; |
| 969 | } |
| 970 | |
Jiri Kosina | dfd347f | 2008-03-04 13:53:33 +0100 | [diff] [blame] | 971 | /* dump the report */ |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 972 | dbg_hid("report %d (size %u) = ", n, size); |
| 973 | for (i = 0; i < size; i++) |
| 974 | dbg_hid_line(" %02x", data[i]); |
| 975 | dbg_hid_line("\n"); |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 976 | |
| 977 | if (!(report = report_enum->report_id_hash[n])) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 978 | dbg_hid("undefined report_id %d received\n", n); |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 979 | return -1; |
| 980 | } |
| 981 | |
| 982 | rsize = ((report->size - 1) >> 3) + 1; |
| 983 | |
| 984 | if (size < rsize) { |
Jiri Kosina | 58037eb | 2007-05-30 15:07:13 +0200 | [diff] [blame] | 985 | dbg_hid("report %d is too short, (%d < %d)\n", report->id, size, rsize); |
Adam Kropelin | 8da7d1b | 2007-04-05 16:06:30 +0200 | [diff] [blame] | 986 | memset(data + size, 0, rsize - size); |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 987 | } |
| 988 | |
| 989 | if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event) |
| 990 | hid->hiddev_report_event(hid, report); |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 991 | if (hid->claimed & HID_CLAIMED_HIDRAW) |
| 992 | hidraw_report_event(hid, data, size); |
Jiri Kosina | aa8de2f | 2006-12-08 18:41:17 +0100 | [diff] [blame] | 993 | |
| 994 | for (n = 0; n < report->maxfield; n++) |
| 995 | hid_input_field(hid, report->field[n], data, interrupt); |
| 996 | |
| 997 | if (hid->claimed & HID_CLAIMED_INPUT) |
| 998 | hidinput_report_event(hid, report); |
| 999 | |
| 1000 | return 0; |
| 1001 | } |
| 1002 | EXPORT_SYMBOL_GPL(hid_input_report); |
| 1003 | |
Jiri Kosina | 86166b7 | 2007-05-14 09:57:40 +0200 | [diff] [blame] | 1004 | static int __init hid_init(void) |
| 1005 | { |
| 1006 | return hidraw_init(); |
| 1007 | } |
| 1008 | |
| 1009 | static void __exit hid_exit(void) |
| 1010 | { |
| 1011 | hidraw_exit(); |
| 1012 | } |
| 1013 | |
| 1014 | module_init(hid_init); |
| 1015 | module_exit(hid_exit); |
| 1016 | |
Jiri Kosina | aa938f7 | 2006-12-08 18:41:10 +0100 | [diff] [blame] | 1017 | MODULE_LICENSE(DRIVER_LICENSE); |
| 1018 | |