1 /****************************************************************************** 2 * 3 * Copyright (C) 2009-2012 Broadcom Corporation 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19 //#if (defined(BTA_HH_INCLUDED) && (BTA_HH_INCLUDED == TRUE)) 20 21 #include <ctype.h> 22 #include <fcntl.h> 23 #include <sys/poll.h> 24 #include <pthread.h> 25 #include <stdio.h> 26 #include <string.h> 27 #include <stdint.h> 28 #include <errno.h> 29 #include <linux/uhid.h> 30 #include "btif_hh.h" 31 #include "bta_api.h" 32 #include "bta_hh_api.h" 33 34 35 36 const char *dev_path = "/dev/uhid"; 37 38 39 /*Internal function to perform UHID write and error checking*/ 40 static int uhid_write(int fd, const struct uhid_event *ev) 41 { 42 ssize_t ret; 43 ret = write(fd, ev, sizeof(*ev)); 44 if (ret < 0){ 45 int rtn = -errno; 46 APPL_TRACE_ERROR2("%s: Cannot write to uhid:%s", __FUNCTION__, strerror(errno)); 47 return rtn; 48 } else if (ret != sizeof(*ev)) { 49 APPL_TRACE_ERROR3("%s: Wrong size written to uhid: %ld != %lu", 50 __FUNCTION__, ret, sizeof(*ev)); 51 return -EFAULT; 52 } else { 53 return 0; 54 } 55 } 56 57 /* Internal function to parse the events received from UHID driver*/ 58 static int uhid_event(btif_hh_device_t *p_dev) 59 { 60 struct uhid_event ev; 61 ssize_t ret; 62 memset(&ev, 0, sizeof(ev)); 63 if(!p_dev) 64 { 65 APPL_TRACE_ERROR1("%s: Device not found",__FUNCTION__) 66 return -1; 67 } 68 ret = read(p_dev->fd, &ev, sizeof(ev)); 69 if (ret == 0) { 70 APPL_TRACE_ERROR2("%s: Read HUP on uhid-cdev %s", __FUNCTION__, 71 strerror(errno)); 72 return -EFAULT; 73 } else if (ret < 0) { 74 APPL_TRACE_ERROR2("%s:Cannot read uhid-cdev: %s", __FUNCTION__, 75 strerror(errno)); 76 return -errno; 77 } else if (ret != sizeof(ev)) { 78 APPL_TRACE_ERROR3("%s:Invalid size read from uhid-dev: %ld != %lu", 79 __FUNCTION__, ret, sizeof(ev)); 80 return -EFAULT; 81 } 82 83 switch (ev.type) { 84 case UHID_START: 85 APPL_TRACE_DEBUG0("UHID_START from uhid-dev\n"); 86 break; 87 case UHID_STOP: 88 APPL_TRACE_DEBUG0("UHID_STOP from uhid-dev\n"); 89 break; 90 case UHID_OPEN: 91 APPL_TRACE_DEBUG0("UHID_OPEN from uhid-dev\n"); 92 break; 93 case UHID_CLOSE: 94 APPL_TRACE_DEBUG0("UHID_CLOSE from uhid-dev\n"); 95 break; 96 case UHID_OUTPUT: 97 APPL_TRACE_DEBUG2("UHID_OUTPUT: Report type = %d, report_size = %d" 98 ,ev.u.output.rtype, ev.u.output.size); 99 //Send SET_REPORT with feature report if the report type in output event is FEATURE 100 if(ev.u.output.rtype == UHID_FEATURE_REPORT) 101 btif_hh_setreport(p_dev,BTHH_FEATURE_REPORT,ev.u.output.size,ev.u.output.data); 102 else if(ev.u.output.rtype == UHID_OUTPUT_REPORT) 103 btif_hh_setreport(p_dev,BTHH_OUTPUT_REPORT,ev.u.output.size,ev.u.output.data); 104 else 105 btif_hh_setreport(p_dev,BTHH_INPUT_REPORT,ev.u.output.size,ev.u.output.data); 106 break; 107 case UHID_OUTPUT_EV: 108 APPL_TRACE_DEBUG0("UHID_OUTPUT_EV from uhid-dev\n"); 109 break; 110 case UHID_FEATURE: 111 APPL_TRACE_DEBUG0("UHID_FEATURE from uhid-dev\n"); 112 break; 113 case UHID_FEATURE_ANSWER: 114 APPL_TRACE_DEBUG0("UHID_FEATURE_ANSWER from uhid-dev\n"); 115 break; 116 117 default: 118 APPL_TRACE_DEBUG1("Invalid event from uhid-dev: %u\n", ev.type); 119 } 120 121 return 0; 122 } 123 124 /******************************************************************************* 125 ** 126 ** Function create_thread 127 ** 128 ** Description creat a select loop 129 ** 130 ** Returns pthread_t 131 ** 132 *******************************************************************************/ 133 static inline pthread_t create_thread(void *(*start_routine)(void *), void * arg){ 134 APPL_TRACE_DEBUG0("create_thread: entered"); 135 pthread_attr_t thread_attr; 136 137 pthread_attr_init(&thread_attr); 138 pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_JOINABLE); 139 pthread_t thread_id = -1; 140 if ( pthread_create(&thread_id, &thread_attr, start_routine, arg)!=0 ) 141 { 142 APPL_TRACE_ERROR1("pthread_create : %s", strerror(errno)); 143 return -1; 144 } 145 APPL_TRACE_DEBUG0("create_thread: thread created successfully"); 146 return thread_id; 147 } 148 149 /******************************************************************************* 150 ** 151 ** Function btif_hh_poll_event_thread 152 ** 153 ** Description the polling thread which polls for event from UHID driver 154 ** 155 ** Returns void 156 ** 157 *******************************************************************************/ 158 static void *btif_hh_poll_event_thread(void *arg) 159 { 160 161 btif_hh_device_t *p_dev = arg; 162 APPL_TRACE_DEBUG2("%s: Thread created fd = %d", __FUNCTION__, p_dev->fd); 163 struct pollfd pfds[1]; 164 int ret; 165 pfds[0].fd = p_dev->fd; 166 pfds[0].events = POLLIN; 167 168 while(p_dev->hh_keep_polling){ 169 ret = poll(pfds, 1, 500); 170 if (ret < 0) { 171 APPL_TRACE_ERROR2("%s: Cannot poll for fds: %s\n", __FUNCTION__, strerror(errno)); 172 break; 173 } 174 if (pfds[0].revents & POLLIN) { 175 APPL_TRACE_DEBUG0("btif_hh_poll_event_thread: POLLIN"); 176 ret = uhid_event(p_dev); 177 if (ret){ 178 break; 179 } 180 } 181 } 182 183 p_dev->hh_poll_thread_id = -1; 184 return 0; 185 } 186 187 static inline void btif_hh_close_poll_thread(btif_hh_device_t *p_dev) 188 { 189 APPL_TRACE_DEBUG1("%s", __FUNCTION__); 190 p_dev->hh_keep_polling = 0; 191 if(p_dev->hh_poll_thread_id > 0) 192 pthread_join(p_dev->hh_poll_thread_id,NULL); 193 194 return; 195 } 196 197 void bta_hh_co_destroy(int fd) 198 { 199 struct uhid_event ev; 200 memset(&ev, 0, sizeof(ev)); 201 ev.type = UHID_DESTROY; 202 uhid_write(fd, &ev); 203 close(fd); 204 } 205 206 int bta_hh_co_write(int fd, UINT8* rpt, UINT16 len) 207 { 208 APPL_TRACE_DEBUG0("bta_hh_co_data: UHID write"); 209 struct uhid_event ev; 210 memset(&ev, 0, sizeof(ev)); 211 ev.type = UHID_INPUT; 212 ev.u.input.size = len; 213 if(len > sizeof(ev.u.input.data)){ 214 APPL_TRACE_WARNING1("%s:report size greater than allowed size",__FUNCTION__); 215 return -1; 216 } 217 memcpy(ev.u.input.data, rpt, len); 218 return uhid_write(fd, &ev); 219 220 } 221 222 223 /******************************************************************************* 224 ** 225 ** Function bta_hh_co_open 226 ** 227 ** Description When connection is opened, this call-out function is executed 228 ** by HH to do platform specific initialization. 229 ** 230 ** Returns void. 231 *******************************************************************************/ 232 void bta_hh_co_open(UINT8 dev_handle, UINT8 sub_class, tBTA_HH_ATTR_MASK attr_mask, 233 UINT8 app_id) 234 { 235 UINT32 i; 236 btif_hh_device_t *p_dev = NULL; 237 238 if (dev_handle == BTA_HH_INVALID_HANDLE) { 239 APPL_TRACE_WARNING2("%s: Oops, dev_handle (%d) is invalid...", __FUNCTION__, dev_handle); 240 return; 241 } 242 243 for (i = 0; i < BTIF_HH_MAX_HID; i++) { 244 p_dev = &btif_hh_cb.devices[i]; 245 if (p_dev->dev_status != BTHH_CONN_STATE_UNKNOWN && p_dev->dev_handle == dev_handle) { 246 // We found a device with the same handle. Must be a device reconnected. 247 APPL_TRACE_WARNING2("%s: Found an existing device with the same handle " 248 "dev_status = %d",__FUNCTION__, 249 p_dev->dev_status); 250 APPL_TRACE_WARNING6("%s: bd_addr = [%02X:%02X:%02X:%02X:%02X:]", __FUNCTION__, 251 p_dev->bd_addr.address[0], p_dev->bd_addr.address[1], p_dev->bd_addr.address[2], 252 p_dev->bd_addr.address[3], p_dev->bd_addr.address[4]); 253 APPL_TRACE_WARNING4("%s: attr_mask = 0x%04x, sub_class = 0x%02x, app_id = %d", 254 __FUNCTION__, p_dev->attr_mask, p_dev->sub_class, p_dev->app_id); 255 256 if(p_dev->fd<0) { 257 p_dev->fd = open(dev_path, O_RDWR | O_CLOEXEC); 258 if (p_dev->fd < 0){ 259 APPL_TRACE_ERROR2("%s: Error: failed to open uhid, err:%s", 260 __FUNCTION__,strerror(errno)); 261 }else 262 APPL_TRACE_DEBUG2("%s: uhid fd = %d", __FUNCTION__, p_dev->fd); 263 } 264 p_dev->hh_keep_polling = 1; 265 p_dev->hh_poll_thread_id = create_thread(btif_hh_poll_event_thread, p_dev); 266 break; 267 } 268 p_dev = NULL; 269 } 270 271 if (p_dev == NULL) { 272 // Did not find a device reconnection case. Find an empty slot now. 273 for (i = 0; i < BTIF_HH_MAX_HID; i++) { 274 if (btif_hh_cb.devices[i].dev_status == BTHH_CONN_STATE_UNKNOWN) { 275 p_dev = &btif_hh_cb.devices[i]; 276 p_dev->dev_handle = dev_handle; 277 p_dev->attr_mask = attr_mask; 278 p_dev->sub_class = sub_class; 279 p_dev->app_id = app_id; 280 281 btif_hh_cb.device_num++; 282 // This is a new device,open the uhid driver now. 283 p_dev->fd = open(dev_path, O_RDWR | O_CLOEXEC); 284 if (p_dev->fd < 0){ 285 APPL_TRACE_ERROR2("%s: Error: failed to open uhid, err:%s", 286 __FUNCTION__,strerror(errno)); 287 }else{ 288 APPL_TRACE_DEBUG2("%s: uhid fd = %d", __FUNCTION__, p_dev->fd); 289 p_dev->hh_keep_polling = 1; 290 p_dev->hh_poll_thread_id = create_thread(btif_hh_poll_event_thread, p_dev); 291 } 292 293 294 break; 295 } 296 } 297 } 298 299 if (p_dev == NULL) { 300 APPL_TRACE_ERROR1("%s: Error: too many HID devices are connected", __FUNCTION__); 301 return; 302 } 303 304 p_dev->dev_status = BTHH_CONN_STATE_CONNECTED; 305 APPL_TRACE_DEBUG2("%s: Return device status %d", __FUNCTION__, p_dev->dev_status); 306 } 307 308 309 /******************************************************************************* 310 ** 311 ** Function bta_hh_co_close 312 ** 313 ** Description When connection is closed, this call-out function is executed 314 ** by HH to do platform specific finalization. 315 ** 316 ** Parameters dev_handle - device handle 317 ** app_id - application id 318 ** 319 ** Returns void. 320 *******************************************************************************/ 321 void bta_hh_co_close(UINT8 dev_handle, UINT8 app_id) 322 { 323 UINT32 i; 324 btif_hh_device_t *p_dev = NULL; 325 326 APPL_TRACE_WARNING3("%s: dev_handle = %d, app_id = %d", __FUNCTION__, dev_handle, app_id); 327 if (dev_handle == BTA_HH_INVALID_HANDLE) { 328 APPL_TRACE_WARNING2("%s: Oops, dev_handle (%d) is invalid...", __FUNCTION__, dev_handle); 329 return; 330 } 331 332 for (i = 0; i < BTIF_HH_MAX_HID; i++) { 333 p_dev = &btif_hh_cb.devices[i]; 334 if (p_dev->dev_status != BTHH_CONN_STATE_UNKNOWN && p_dev->dev_handle == dev_handle) { 335 APPL_TRACE_WARNING3("%s: Found an existing device with the same handle " 336 "dev_status = %d, dev_handle =%d" 337 ,__FUNCTION__,p_dev->dev_status 338 ,p_dev->dev_handle); 339 btif_hh_close_poll_thread(p_dev); 340 break; 341 } 342 } 343 344 } 345 346 347 /******************************************************************************* 348 ** 349 ** Function bta_hh_co_data 350 ** 351 ** Description This function is executed by BTA when HID host receive a data 352 ** report. 353 ** 354 ** Parameters dev_handle - device handle 355 ** *p_rpt - pointer to the report data 356 ** len - length of report data 357 ** mode - Hid host Protocol Mode 358 ** sub_clas - Device Subclass 359 ** app_id - application id 360 ** 361 ** Returns void 362 *******************************************************************************/ 363 void bta_hh_co_data(UINT8 dev_handle, UINT8 *p_rpt, UINT16 len, tBTA_HH_PROTO_MODE mode, 364 UINT8 sub_class, UINT8 ctry_code, BD_ADDR peer_addr, UINT8 app_id) 365 { 366 btif_hh_device_t *p_dev; 367 368 APPL_TRACE_DEBUG6("%s: dev_handle = %d, subclass = 0x%02X, mode = %d, " 369 "ctry_code = %d, app_id = %d", 370 __FUNCTION__, dev_handle, sub_class, mode, ctry_code, app_id); 371 372 p_dev = btif_hh_find_connected_dev_by_handle(dev_handle); 373 if (p_dev == NULL) { 374 APPL_TRACE_WARNING2("%s: Error: unknown HID device handle %d", __FUNCTION__, dev_handle); 375 return; 376 } 377 // Send the HID report to the kernel. 378 if (p_dev->fd >= 0) { 379 bta_hh_co_write(p_dev->fd, p_rpt, len); 380 }else { 381 APPL_TRACE_WARNING3("%s: Error: fd = %d, len = %d", __FUNCTION__, p_dev->fd, len); 382 } 383 } 384 385 386 /******************************************************************************* 387 ** 388 ** Function bta_hh_co_send_hid_info 389 ** 390 ** Description This function is called in btif_hh.c to process DSCP received. 391 ** 392 ** Parameters dev_handle - device handle 393 ** dscp_len - report descriptor length 394 ** *p_dscp - report descriptor 395 ** 396 ** Returns void 397 *******************************************************************************/ 398 void bta_hh_co_send_hid_info(btif_hh_device_t *p_dev, char *dev_name, UINT16 vendor_id, 399 UINT16 product_id, UINT16 version, UINT8 ctry_code, 400 int dscp_len, UINT8 *p_dscp) 401 { 402 int result; 403 struct uhid_event ev; 404 405 if (p_dev->fd < 0) { 406 APPL_TRACE_WARNING3("%s: Error: fd = %d, dscp_len = %d", __FUNCTION__, p_dev->fd, dscp_len); 407 return; 408 } 409 410 APPL_TRACE_WARNING4("%s: fd = %d, name = [%s], dscp_len = %d", __FUNCTION__, 411 p_dev->fd, dev_name, dscp_len); 412 APPL_TRACE_WARNING5("%s: vendor_id = 0x%04x, product_id = 0x%04x, version= 0x%04x," 413 "ctry_code=0x%02x",__FUNCTION__, 414 vendor_id, product_id, 415 version, ctry_code); 416 417 //Create and send hid descriptor to kernel 418 memset(&ev, 0, sizeof(ev)); 419 ev.type = UHID_CREATE; 420 strncpy((char*)ev.u.create.name, dev_name, sizeof(ev.u.create.name) - 1); 421 ev.u.create.rd_size = dscp_len; 422 ev.u.create.rd_data = p_dscp; 423 ev.u.create.bus = BUS_BLUETOOTH; 424 ev.u.create.vendor = vendor_id; 425 ev.u.create.product = product_id; 426 ev.u.create.version = version; 427 ev.u.create.country = ctry_code; 428 result = uhid_write(p_dev->fd, &ev); 429 430 APPL_TRACE_WARNING4("%s: fd = %d, dscp_len = %d, result = %d", __FUNCTION__, 431 p_dev->fd, dscp_len, result); 432 433 if (result) { 434 APPL_TRACE_WARNING2("%s: Error: failed to send DSCP, result = %d", __FUNCTION__, result); 435 436 /* The HID report descriptor is corrupted. Close the driver. */ 437 close(p_dev->fd); 438 p_dev->fd = -1; 439 } 440 } 441 442 443