1 /******************************************************************************
2 *
3 * Copyright (C) 2000-2012 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 /*****************************************************************************
20 *
21 * This file contains functions that manages ACL link modes.
22 * This includes operations such as active, hold,
23 * park and sniff modes.
24 *
25 * This module contains both internal and external (API)
26 * functions. External (API) functions are distinguishable
27 * by their names beginning with uppercase BTM.
28 *
29 *****************************************************************************/
30
31 #define LOG_TAG "bt_btm_pm"
32
33 #include <stdlib.h>
34 #include <string.h>
35 #include <stdio.h>
36 #include <stddef.h>
37
38 #include "bt_types.h"
39 #include "gki.h"
40 #include "hcimsgs.h"
41 #include "btu.h"
42 #include "btm_api.h"
43 #include "btm_int.h"
44 #include "l2c_int.h"
45 #include "hcidefs.h"
46 #include "bt_utils.h"
47 #include "osi/include/log.h"
48
49 /*****************************************************************************/
50 /* to handle different modes */
51 /*****************************************************************************/
52 #define BTM_PM_STORED_MASK 0x80 /* set this mask if the command is stored */
53 #define BTM_PM_NUM_SET_MODES 3 /* only hold, sniff & park */
54
55 /* Usage: (ptr_features[ offset ] & mask )?TRUE:FALSE */
56 /* offset to supported feature */
57 const UINT8 btm_pm_mode_off[BTM_PM_NUM_SET_MODES] = {0, 0, 1};
58 /* mask to supported feature */
59 const UINT8 btm_pm_mode_msk[BTM_PM_NUM_SET_MODES] = {0x40, 0x80, 0x01};
60
61 #define BTM_PM_GET_MD1 1
62 #define BTM_PM_GET_MD2 2
63 #define BTM_PM_GET_COMP 3
64
65 const UINT8 btm_pm_md_comp_matrix[BTM_PM_NUM_SET_MODES*BTM_PM_NUM_SET_MODES] =
66 {
67 BTM_PM_GET_COMP,
68 BTM_PM_GET_MD2,
69 BTM_PM_GET_MD2,
70
71 BTM_PM_GET_MD1,
72 BTM_PM_GET_COMP,
73 BTM_PM_GET_MD1,
74
75 BTM_PM_GET_MD1,
76 BTM_PM_GET_MD2,
77 BTM_PM_GET_COMP
78 };
79
80 /* function prototype */
81 static int btm_pm_find_acl_ind(BD_ADDR remote_bda);
82 static tBTM_STATUS btm_pm_snd_md_req( UINT8 pm_id, int link_ind, tBTM_PM_PWR_MD *p_mode );
83 static const char *mode_to_string(tBTM_PM_MODE mode);
84
85 /*
86 #ifdef BTM_PM_DEBUG
87 #undef BTM_PM_DEBUG
88 #define BTM_PM_DEBUG TRUE
89 #endif
90 */
91
92 #if BTM_PM_DEBUG == TRUE
93 const char * btm_pm_state_str[] =
94 {
95 "pm_active_state",
96 "pm_hold_state",
97 "pm_sniff_state",
98 "pm_park_state",
99 "pm_pend_state"
100 };
101
102 const char * btm_pm_event_str[] =
103 {
104 "pm_set_mode_event",
105 "pm_hci_sts_event",
106 "pm_mod_chg_event",
107 "pm_update_event"
108 };
109
110 const char * btm_pm_action_str[] =
111 {
112 "pm_set_mode_action",
113 "pm_update_db_action",
114 "pm_mod_chg_action",
115 "pm_hci_sts_action",
116 "pm_update_action"
117 };
118 #endif // BTM_PM_DEBUG
119
120 /*****************************************************************************/
121 /* P U B L I C F U N C T I O N S */
122 /*****************************************************************************/
123 /*******************************************************************************
124 **
125 ** Function BTM_PmRegister
126 **
127 ** Description register or deregister with power manager
128 **
129 ** Returns BTM_SUCCESS if successful,
130 ** BTM_NO_RESOURCES if no room to hold registration
131 ** BTM_ILLEGAL_VALUE
132 **
133 *******************************************************************************/
BTM_PmRegister(UINT8 mask,UINT8 * p_pm_id,tBTM_PM_STATUS_CBACK * p_cb)134 tBTM_STATUS BTM_PmRegister (UINT8 mask, UINT8 *p_pm_id, tBTM_PM_STATUS_CBACK *p_cb)
135 {
136 int xx;
137
138 /* de-register */
139 if(mask & BTM_PM_DEREG)
140 {
141 if(*p_pm_id >= BTM_MAX_PM_RECORDS)
142 return BTM_ILLEGAL_VALUE;
143 btm_cb.pm_reg_db[*p_pm_id].mask = BTM_PM_REC_NOT_USED;
144 return BTM_SUCCESS;
145 }
146
147 for(xx=0; xx<BTM_MAX_PM_RECORDS; xx++)
148 {
149 /* find an unused entry */
150 if(btm_cb.pm_reg_db[xx].mask == BTM_PM_REC_NOT_USED)
151 {
152 /* if register for notification, should provide callback routine */
153 if(mask & BTM_PM_REG_NOTIF)
154 {
155 if(p_cb == NULL)
156 return BTM_ILLEGAL_VALUE;
157 btm_cb.pm_reg_db[xx].cback = p_cb;
158 }
159 btm_cb.pm_reg_db[xx].mask = mask;
160 *p_pm_id = xx;
161 return BTM_SUCCESS;
162 }
163 }
164
165 return BTM_NO_RESOURCES;
166 }
167
168 /*******************************************************************************
169 **
170 ** Function BTM_SetPowerMode
171 **
172 ** Description store the mode in control block or
173 ** alter ACL connection behavior.
174 **
175 ** Returns BTM_SUCCESS if successful,
176 ** BTM_UNKNOWN_ADDR if bd addr is not active or bad
177 **
178 *******************************************************************************/
BTM_SetPowerMode(UINT8 pm_id,BD_ADDR remote_bda,tBTM_PM_PWR_MD * p_mode)179 tBTM_STATUS BTM_SetPowerMode (UINT8 pm_id, BD_ADDR remote_bda, tBTM_PM_PWR_MD *p_mode)
180 {
181 UINT8 *p_features;
182 int ind, acl_ind;
183 tBTM_PM_MCB *p_cb = NULL; /* per ACL link */
184 tBTM_PM_MODE mode;
185 int temp_pm_id;
186
187
188 if(pm_id >= BTM_MAX_PM_RECORDS)
189 pm_id = BTM_PM_SET_ONLY_ID;
190
191 if(p_mode == NULL)
192 return BTM_ILLEGAL_VALUE;
193
194 BTM_TRACE_API( "BTM_SetPowerMode: pm_id %d BDA: %08x mode:0x%x", pm_id,
195 (remote_bda[2]<<24)+(remote_bda[3]<<16)+(remote_bda[4]<<8)+remote_bda[5], p_mode->mode);
196
197 /* take out the force bit */
198 mode = p_mode->mode & ~BTM_PM_MD_FORCE;
199
200 acl_ind = btm_pm_find_acl_ind(remote_bda);
201 if(acl_ind == MAX_L2CAP_LINKS)
202 return (BTM_UNKNOWN_ADDR);
203
204 p_cb = &(btm_cb.pm_mode_db[acl_ind]);
205
206 if(mode != BTM_PM_MD_ACTIVE)
207 {
208 /* check if the requested mode is supported */
209 ind = mode - BTM_PM_MD_HOLD; /* make it base 0 */
210 p_features = BTM_ReadLocalFeatures();
211 if( !(p_features[ btm_pm_mode_off[ind] ] & btm_pm_mode_msk[ind] ) )
212 return BTM_MODE_UNSUPPORTED;
213 }
214
215 if(mode == p_cb->state) /* the requested mode is current mode */
216 {
217 /* already in the requested mode and the current interval has less latency than the max */
218 if( (mode == BTM_PM_MD_ACTIVE) ||
219 ((p_mode->mode & BTM_PM_MD_FORCE) && (p_mode->max >= p_cb->interval) && (p_mode->min <= p_cb->interval)) ||
220 ((p_mode->mode & BTM_PM_MD_FORCE)==0 && (p_mode->max >= p_cb->interval)) )
221 {
222 BTM_TRACE_DEBUG( "BTM_SetPowerMode: mode:0x%x interval %d max:%d, min:%d", p_mode->mode, p_cb->interval, p_mode->max, p_mode->min);
223 return BTM_SUCCESS;
224 }
225 }
226
227 temp_pm_id = pm_id;
228 if(pm_id == BTM_PM_SET_ONLY_ID)
229 temp_pm_id = BTM_MAX_PM_RECORDS;
230
231 /* update mode database */
232 if( ((pm_id != BTM_PM_SET_ONLY_ID) &&
233 (btm_cb.pm_reg_db[pm_id].mask & BTM_PM_REG_SET))
234 || ((pm_id == BTM_PM_SET_ONLY_ID) && (btm_cb.pm_pend_link != MAX_L2CAP_LINKS)) )
235 {
236 #if BTM_PM_DEBUG == TRUE
237 BTM_TRACE_DEBUG( "BTM_SetPowerMode: Saving cmd acl_ind %d temp_pm_id %d", acl_ind,temp_pm_id);
238 #endif // BTM_PM_DEBUG
239 /* Make sure mask is set to BTM_PM_REG_SET */
240 btm_cb.pm_reg_db[temp_pm_id].mask |= BTM_PM_REG_SET;
241 *(&p_cb->req_mode[temp_pm_id]) = *((tBTM_PM_PWR_MD *)p_mode);
242 p_cb->chg_ind = TRUE;
243 }
244
245 #if BTM_PM_DEBUG == TRUE
246 BTM_TRACE_DEBUG( "btm_pm state:0x%x, pm_pend_link: %d", p_cb->state, btm_cb.pm_pend_link);
247 #endif // BTM_PM_DEBUG
248 /* if mode == hold or pending, return */
249 if( (p_cb->state == BTM_PM_STS_HOLD) ||
250 (p_cb->state == BTM_PM_STS_PENDING) ||
251 (btm_cb.pm_pend_link != MAX_L2CAP_LINKS) ) /* command pending */
252 {
253 if(acl_ind != btm_cb.pm_pend_link)
254 {
255 /* set the stored mask */
256 p_cb->state |= BTM_PM_STORED_MASK;
257 BTM_TRACE_DEBUG( "btm_pm state stored:%d",acl_ind);
258 }
259 return BTM_CMD_STORED;
260 }
261
262
263
264 return btm_pm_snd_md_req(pm_id, acl_ind, p_mode);
265 }
266
267 /*******************************************************************************
268 **
269 ** Function BTM_ReadPowerMode
270 **
271 ** Description This returns the current mode for a specific
272 ** ACL connection.
273 **
274 ** Input Param remote_bda - device address of desired ACL connection
275 **
276 ** Output Param p_mode - address where the current mode is copied into.
277 ** BTM_ACL_MODE_NORMAL
278 ** BTM_ACL_MODE_HOLD
279 ** BTM_ACL_MODE_SNIFF
280 ** BTM_ACL_MODE_PARK
281 ** (valid only if return code is BTM_SUCCESS)
282 **
283 ** Returns BTM_SUCCESS if successful,
284 ** BTM_UNKNOWN_ADDR if bd addr is not active or bad
285 **
286 *******************************************************************************/
BTM_ReadPowerMode(BD_ADDR remote_bda,tBTM_PM_MODE * p_mode)287 tBTM_STATUS BTM_ReadPowerMode (BD_ADDR remote_bda, tBTM_PM_MODE *p_mode)
288 {
289 int acl_ind;
290
291 if( (acl_ind = btm_pm_find_acl_ind(remote_bda)) == MAX_L2CAP_LINKS)
292 return (BTM_UNKNOWN_ADDR);
293
294 *p_mode = btm_cb.pm_mode_db[acl_ind].state;
295 return BTM_SUCCESS;
296 }
297
298 /*******************************************************************************
299 **
300 ** Function BTM_SetSsrParams
301 **
302 ** Description This sends the given SSR parameters for the given ACL
303 ** connection if it is in ACTIVE mode.
304 **
305 ** Input Param remote_bda - device address of desired ACL connection
306 ** max_lat - maximum latency (in 0.625ms)(0-0xFFFE)
307 ** min_rmt_to - minimum remote timeout
308 ** min_loc_to - minimum local timeout
309 **
310 **
311 ** Returns BTM_SUCCESS if the HCI command is issued successful,
312 ** BTM_UNKNOWN_ADDR if bd addr is not active or bad
313 ** BTM_CMD_STORED if the command is stored
314 **
315 *******************************************************************************/
BTM_SetSsrParams(BD_ADDR remote_bda,UINT16 max_lat,UINT16 min_rmt_to,UINT16 min_loc_to)316 tBTM_STATUS BTM_SetSsrParams (BD_ADDR remote_bda, UINT16 max_lat,
317 UINT16 min_rmt_to, UINT16 min_loc_to)
318 {
319 #if (BTM_SSR_INCLUDED == TRUE)
320 int acl_ind;
321 tBTM_PM_MCB *p_cb;
322
323 if( (acl_ind = btm_pm_find_acl_ind(remote_bda)) == MAX_L2CAP_LINKS)
324 return (BTM_UNKNOWN_ADDR);
325
326 if(BTM_PM_STS_ACTIVE == btm_cb.pm_mode_db[acl_ind].state ||
327 BTM_PM_STS_SNIFF == btm_cb.pm_mode_db[acl_ind].state)
328 {
329 if (btsnd_hcic_sniff_sub_rate(btm_cb.acl_db[acl_ind].hci_handle, max_lat,
330 min_rmt_to, min_loc_to))
331 return BTM_SUCCESS;
332 else
333 return BTM_NO_RESOURCES;
334 }
335 p_cb = &btm_cb.pm_mode_db[acl_ind];
336 p_cb->max_lat = max_lat;
337 p_cb->min_rmt_to = min_rmt_to;
338 p_cb->min_loc_to = min_loc_to;
339 return BTM_CMD_STORED;
340 #else
341 return BTM_ILLEGAL_ACTION;
342 #endif // BTM_SSR_INCLUDED
343 }
344
345 /*******************************************************************************
346 **
347 ** Function btm_pm_reset
348 **
349 ** Description as a part of the BTM reset process.
350 **
351 ** Returns void
352 **
353 *******************************************************************************/
btm_pm_reset(void)354 void btm_pm_reset(void)
355 {
356 int xx;
357 tBTM_PM_STATUS_CBACK *cb = NULL;
358
359 /* clear the pending request for application */
360 if( (btm_cb.pm_pend_id != BTM_PM_SET_ONLY_ID) &&
361 (btm_cb.pm_reg_db[btm_cb.pm_pend_id].mask & BTM_PM_REG_NOTIF) )
362 {
363 cb = btm_cb.pm_reg_db[btm_cb.pm_pend_id].cback;
364 }
365
366
367 /* clear the register record */
368 for(xx=0; xx<BTM_MAX_PM_RECORDS; xx++)
369 {
370 btm_cb.pm_reg_db[xx].mask = BTM_PM_REC_NOT_USED;
371 }
372
373 if(cb != NULL && btm_cb.pm_pend_link < MAX_L2CAP_LINKS)
374 (*cb)(btm_cb.acl_db[btm_cb.pm_pend_link].remote_addr, BTM_PM_STS_ERROR, BTM_DEV_RESET, 0);
375
376 /* no command pending */
377 btm_cb.pm_pend_link = MAX_L2CAP_LINKS;
378 }
379
380 /*******************************************************************************
381 **
382 ** Function btm_pm_sm_alloc
383 **
384 ** Description This function initializes the control block of an ACL link.
385 ** It is called when an ACL connection is created.
386 **
387 ** Returns void
388 **
389 *******************************************************************************/
btm_pm_sm_alloc(UINT8 ind)390 void btm_pm_sm_alloc(UINT8 ind)
391 {
392 tBTM_PM_MCB *p_db = &btm_cb.pm_mode_db[ind]; /* per ACL link */
393 memset (p_db, 0, sizeof(tBTM_PM_MCB));
394 p_db->state = BTM_PM_ST_ACTIVE;
395 #if BTM_PM_DEBUG == TRUE
396 BTM_TRACE_DEBUG( "btm_pm_sm_alloc ind:%d st:%d", ind, p_db->state);
397 #endif // BTM_PM_DEBUG
398 }
399
400 /*******************************************************************************
401 **
402 ** Function btm_pm_find_acl_ind
403 **
404 ** Description This function initializes the control block of an ACL link.
405 ** It is called when an ACL connection is created.
406 **
407 ** Returns void
408 **
409 *******************************************************************************/
btm_pm_find_acl_ind(BD_ADDR remote_bda)410 static int btm_pm_find_acl_ind(BD_ADDR remote_bda)
411 {
412 tACL_CONN *p = &btm_cb.acl_db[0];
413 UINT8 xx;
414
415 for (xx = 0; xx < MAX_L2CAP_LINKS; xx++, p++)
416 {
417 if ((p->in_use) && (!memcmp (p->remote_addr, remote_bda, BD_ADDR_LEN))
418 #if (BLE_INCLUDED == TRUE)
419 && p->transport == BT_TRANSPORT_BR_EDR
420 #endif // BLE_INCLUDED
421 )
422 {
423 #if BTM_PM_DEBUG == TRUE
424 BTM_TRACE_DEBUG( "btm_pm_find_acl_ind ind:%d, st:%d", xx, btm_cb.pm_mode_db[xx].state);
425 #endif // BTM_PM_DEBUG
426 break;
427 }
428 }
429 return xx;
430 }
431
432 /*******************************************************************************
433 **
434 ** Function btm_pm_compare_modes
435 ** Description get the "more active" mode of the 2
436 ** Returns void
437 **
438 *******************************************************************************/
btm_pm_compare_modes(tBTM_PM_PWR_MD * p_md1,tBTM_PM_PWR_MD * p_md2,tBTM_PM_PWR_MD * p_res)439 static tBTM_PM_PWR_MD * btm_pm_compare_modes(tBTM_PM_PWR_MD *p_md1, tBTM_PM_PWR_MD *p_md2, tBTM_PM_PWR_MD *p_res)
440 {
441 UINT8 res;
442
443 if(p_md1 == NULL)
444 {
445 *p_res = *p_md2;
446 p_res->mode &= ~BTM_PM_MD_FORCE;
447
448 return p_md2;
449 }
450
451 if(p_md2->mode == BTM_PM_MD_ACTIVE || p_md1->mode == BTM_PM_MD_ACTIVE)
452 {
453 return NULL;
454 }
455
456 /* check if force bit is involved */
457 if(p_md1->mode & BTM_PM_MD_FORCE)
458 {
459 *p_res = *p_md1;
460 p_res->mode &= ~BTM_PM_MD_FORCE;
461 return p_res;
462 }
463
464 if(p_md2->mode & BTM_PM_MD_FORCE)
465 {
466 *p_res = *p_md2;
467 p_res->mode &= ~BTM_PM_MD_FORCE;
468 return p_res;
469 }
470
471 res = (p_md1->mode - 1) * BTM_PM_NUM_SET_MODES + (p_md2->mode - 1);
472 res = btm_pm_md_comp_matrix[res];
473 switch(res)
474 {
475 case BTM_PM_GET_MD1:
476 *p_res = *p_md1;
477 return p_md1;
478
479 case BTM_PM_GET_MD2:
480 *p_res = *p_md2;
481 return p_md2;
482
483 case BTM_PM_GET_COMP:
484 p_res->mode = p_md1->mode;
485 /* min of the two */
486 p_res->max = (p_md1->max < p_md2->max)? (p_md1->max) : (p_md2->max);
487 /* max of the two */
488 p_res->min = (p_md1->min > p_md2->min)? (p_md1->min) : (p_md2->min);
489
490 /* the intersection is NULL */
491 if( p_res->max < p_res->min)
492 return NULL;
493
494 if(p_res->mode == BTM_PM_MD_SNIFF)
495 {
496 /* max of the two */
497 p_res->attempt = (p_md1->attempt > p_md2->attempt)? (p_md1->attempt) : (p_md2->attempt);
498 p_res->timeout = (p_md1->timeout > p_md2->timeout)? (p_md1->timeout) : (p_md2->timeout);
499 }
500 return p_res;
501 }
502 return NULL;
503 }
504
505 /*******************************************************************************
506 **
507 ** Function btm_pm_get_set_mode
508 ** Description get the resulting mode from the registered parties, then compare it
509 ** with the requested mode, if the command is from an unregistered party.
510 ** Returns void
511 **
512 *******************************************************************************/
btm_pm_get_set_mode(UINT8 pm_id,tBTM_PM_MCB * p_cb,tBTM_PM_PWR_MD * p_mode,tBTM_PM_PWR_MD * p_res)513 static tBTM_PM_MODE btm_pm_get_set_mode(UINT8 pm_id, tBTM_PM_MCB *p_cb, tBTM_PM_PWR_MD *p_mode, tBTM_PM_PWR_MD *p_res)
514 {
515 int xx, loop_max;
516 tBTM_PM_PWR_MD *p_md = NULL;
517
518 if(p_mode != NULL && p_mode->mode & BTM_PM_MD_FORCE)
519 {
520 *p_res = *p_mode;
521 p_res->mode &= ~BTM_PM_MD_FORCE;
522 return p_res->mode;
523 }
524
525 if(!p_mode)
526 loop_max = BTM_MAX_PM_RECORDS+1;
527 else
528 loop_max = BTM_MAX_PM_RECORDS;
529
530 for( xx=0; xx<loop_max; xx++)
531 {
532 /* g through all the registered "set" parties */
533 if(btm_cb.pm_reg_db[xx].mask & BTM_PM_REG_SET)
534 {
535 if(p_cb->req_mode[xx].mode == BTM_PM_MD_ACTIVE)
536 {
537 /* if at least one registered (SET) party says ACTIVE, stay active */
538 return BTM_PM_MD_ACTIVE;
539 }
540 else
541 {
542 /* if registered parties give conflicting information, stay active */
543 if( (btm_pm_compare_modes(p_md, &p_cb->req_mode[xx], p_res)) == NULL)
544 return BTM_PM_MD_ACTIVE;
545 p_md = p_res;
546 }
547 }
548 }
549
550 /* if the resulting mode is NULL(nobody registers SET), use the requested mode */
551 if(p_md == NULL)
552 {
553 if(p_mode)
554 *p_res = *((tBTM_PM_PWR_MD *)p_mode);
555 else /* p_mode is NULL when btm_pm_snd_md_req is called from btm_pm_proc_mode_change */
556 return BTM_PM_MD_ACTIVE;
557 }
558 else
559 {
560 /* if the command is from unregistered party,
561 compare the resulting mode from registered party*/
562 if( (pm_id == BTM_PM_SET_ONLY_ID) &&
563 ((btm_pm_compare_modes(p_mode, p_md, p_res)) == NULL) )
564 return BTM_PM_MD_ACTIVE;
565 }
566
567 return p_res->mode;
568 }
569
570 /*******************************************************************************
571 **
572 ** Function btm_pm_snd_md_req
573 ** Description get the resulting mode and send the resuest to host controller
574 ** Returns tBTM_STATUS
575 **, BOOLEAN *p_chg_ind
576 *******************************************************************************/
btm_pm_snd_md_req(UINT8 pm_id,int link_ind,tBTM_PM_PWR_MD * p_mode)577 static tBTM_STATUS btm_pm_snd_md_req(UINT8 pm_id, int link_ind, tBTM_PM_PWR_MD *p_mode)
578 {
579 tBTM_PM_PWR_MD md_res;
580 tBTM_PM_MODE mode;
581 tBTM_PM_MCB *p_cb = &btm_cb.pm_mode_db[link_ind];
582 BOOLEAN chg_ind = FALSE;
583
584 mode = btm_pm_get_set_mode(pm_id, p_cb, p_mode, &md_res);
585 md_res.mode = mode;
586
587 #if BTM_PM_DEBUG == TRUE
588 BTM_TRACE_DEBUG( "btm_pm_snd_md_req link_ind:%d, mode: %d",
589 link_ind, mode);
590 #endif // BTM_PM_DEBUG
591
592 if( p_cb->state == mode)
593 {
594 /* already in the resulting mode */
595 if( (mode == BTM_PM_MD_ACTIVE) ||
596 ((md_res.max >= p_cb->interval) && (md_res.min <= p_cb->interval)) )
597 return BTM_CMD_STORED;
598 /* Otherwise, needs to wake, then sleep */
599 chg_ind = TRUE;
600 }
601 p_cb->chg_ind = chg_ind;
602
603 /* cannot go directly from current mode to resulting mode. */
604 if( mode != BTM_PM_MD_ACTIVE && p_cb->state != BTM_PM_MD_ACTIVE)
605 p_cb->chg_ind = TRUE; /* needs to wake, then sleep */
606
607 if(p_cb->chg_ind == TRUE) /* needs to wake first */
608 md_res.mode = BTM_PM_MD_ACTIVE;
609 #if (BTM_SSR_INCLUDED == TRUE)
610 else if(BTM_PM_MD_SNIFF == md_res.mode && p_cb->max_lat)
611 {
612 btsnd_hcic_sniff_sub_rate(btm_cb.acl_db[link_ind].hci_handle, p_cb->max_lat,
613 p_cb->min_rmt_to, p_cb->min_loc_to);
614 p_cb->max_lat = 0;
615 }
616 #endif // BTM_SSR_INCLUDED
617 /* Default is failure */
618 btm_cb.pm_pend_link = MAX_L2CAP_LINKS;
619
620 /* send the appropriate HCI command */
621 btm_cb.pm_pend_id = pm_id;
622
623 #if BTM_PM_DEBUG == TRUE
624 BTM_TRACE_DEBUG("btm_pm_snd_md_req state:0x%x, link_ind: %d", p_cb->state, link_ind);
625 #endif // BTM_PM_DEBUG
626
627 LOG_DEBUG("%s switching from %s to %s.", __func__, mode_to_string(p_cb->state), mode_to_string(md_res.mode));
628 switch(md_res.mode)
629 {
630 case BTM_PM_MD_ACTIVE:
631 switch(p_cb->state)
632 {
633 case BTM_PM_MD_SNIFF:
634 if (btsnd_hcic_exit_sniff_mode(btm_cb.acl_db[link_ind].hci_handle))
635 {
636 btm_cb.pm_pend_link = link_ind;
637 }
638 break;
639 case BTM_PM_MD_PARK:
640 if (btsnd_hcic_exit_park_mode(btm_cb.acl_db[link_ind].hci_handle))
641 {
642 btm_cb.pm_pend_link = link_ind;
643 }
644 break;
645 default:
646 /* Failure btm_cb.pm_pend_link = MAX_L2CAP_LINKS */
647 break;
648 }
649 break;
650
651 case BTM_PM_MD_HOLD:
652 if (btsnd_hcic_hold_mode (btm_cb.acl_db[link_ind].hci_handle,
653 md_res.max, md_res.min))
654 {
655 btm_cb.pm_pend_link = link_ind;
656 }
657 break;
658
659 case BTM_PM_MD_SNIFF:
660 if (btsnd_hcic_sniff_mode (btm_cb.acl_db[link_ind].hci_handle,
661 md_res.max, md_res.min, md_res.attempt,
662 md_res.timeout))
663 {
664 btm_cb.pm_pend_link = link_ind;
665 }
666 break;
667
668 case BTM_PM_MD_PARK:
669 if (btsnd_hcic_park_mode (btm_cb.acl_db[link_ind].hci_handle,
670 md_res.max, md_res.min))
671 {
672 btm_cb.pm_pend_link = link_ind;
673 }
674 break;
675 default:
676 /* Failure btm_cb.pm_pend_link = MAX_L2CAP_LINKS */
677 break;
678 }
679
680 if(btm_cb.pm_pend_link == MAX_L2CAP_LINKS)
681 {
682 /* the command was not sent */
683 #if BTM_PM_DEBUG == TRUE
684 BTM_TRACE_DEBUG( "pm_pend_link: %d",btm_cb.pm_pend_link);
685 #endif // BTM_PM_DEBUG
686 return (BTM_NO_RESOURCES);
687 }
688
689 return BTM_CMD_STARTED;
690 }
691
692 /*******************************************************************************
693 **
694 ** Function btm_pm_check_stored
695 **
696 ** Description This function is called when an HCI command status event occurs
697 ** to check if there's any PM command issued while waiting for
698 ** HCI command status.
699 **
700 ** Returns none.
701 **
702 *******************************************************************************/
btm_pm_check_stored(void)703 static void btm_pm_check_stored(void)
704 {
705 int xx;
706 for(xx=0; xx<MAX_L2CAP_LINKS; xx++)
707 {
708 if(btm_cb.pm_mode_db[xx].state & BTM_PM_STORED_MASK)
709 {
710 btm_cb.pm_mode_db[xx].state &= ~BTM_PM_STORED_MASK;
711 BTM_TRACE_DEBUG( "btm_pm_check_stored :%d", xx);
712 btm_pm_snd_md_req(BTM_PM_SET_ONLY_ID, xx, NULL);
713 break;
714 }
715 }
716 }
717
718
719 /*******************************************************************************
720 **
721 ** Function btm_pm_proc_cmd_status
722 **
723 ** Description This function is called when an HCI command status event occurs
724 ** for power manager related commands.
725 **
726 ** Input Parms status - status of the event (HCI_SUCCESS if no errors)
727 **
728 ** Returns none.
729 **
730 *******************************************************************************/
btm_pm_proc_cmd_status(UINT8 status)731 void btm_pm_proc_cmd_status(UINT8 status)
732 {
733 tBTM_PM_MCB *p_cb;
734 tBTM_PM_STATUS pm_status;
735
736 if(btm_cb.pm_pend_link >= MAX_L2CAP_LINKS)
737 return;
738
739 p_cb = &btm_cb.pm_mode_db[btm_cb.pm_pend_link];
740
741 if(status == HCI_SUCCESS)
742 {
743 p_cb->state = BTM_PM_ST_PENDING;
744 pm_status = BTM_PM_STS_PENDING;
745 #if BTM_PM_DEBUG == TRUE
746 BTM_TRACE_DEBUG( "btm_pm_proc_cmd_status new state:0x%x", p_cb->state);
747 #endif // BTM_PM_DEBUG
748 }
749 else /* the command was not successfull. Stay in the same state */
750 {
751 pm_status = BTM_PM_STS_ERROR;
752 }
753
754 /* notify the caller is appropriate */
755 if( (btm_cb.pm_pend_id != BTM_PM_SET_ONLY_ID) &&
756 (btm_cb.pm_reg_db[btm_cb.pm_pend_id].mask & BTM_PM_REG_NOTIF) )
757 {
758 (*btm_cb.pm_reg_db[btm_cb.pm_pend_id].cback)(btm_cb.acl_db[btm_cb.pm_pend_link].remote_addr, pm_status, 0, status);
759 }
760
761 /* no pending cmd now */
762 #if BTM_PM_DEBUG == TRUE
763 BTM_TRACE_DEBUG( "btm_pm_proc_cmd_status state:0x%x, pm_pend_link: %d(new: %d)",
764 p_cb->state, btm_cb.pm_pend_link, MAX_L2CAP_LINKS);
765 #endif // BTM_PM_DEBUG
766 btm_cb.pm_pend_link = MAX_L2CAP_LINKS;
767
768 btm_pm_check_stored();
769 }
770
771 /*******************************************************************************
772 **
773 ** Function btm_process_mode_change
774 **
775 ** Description This function is called when an HCI mode change event occurs.
776 **
777 ** Input Parms hci_status - status of the event (HCI_SUCCESS if no errors)
778 ** hci_handle - connection handle associated with the change
779 ** mode - HCI_MODE_ACTIVE, HCI_MODE_HOLD, HCI_MODE_SNIFF, or HCI_MODE_PARK
780 ** interval - number of baseband slots (meaning depends on mode)
781 **
782 ** Returns none.
783 **
784 *******************************************************************************/
btm_pm_proc_mode_change(UINT8 hci_status,UINT16 hci_handle,UINT8 mode,UINT16 interval)785 void btm_pm_proc_mode_change (UINT8 hci_status, UINT16 hci_handle, UINT8 mode, UINT16 interval)
786 {
787 tACL_CONN *p;
788 tBTM_PM_MCB *p_cb = NULL;
789 int xx, yy, zz;
790 tBTM_PM_STATE old_state;
791 tL2C_LCB *p_lcb;
792
793 /* get the index to acl_db */
794 if ((xx = btm_handle_to_acl_index(hci_handle)) >= MAX_L2CAP_LINKS)
795 return;
796
797 p = &btm_cb.acl_db[xx];
798
799 /* update control block */
800 p_cb = &(btm_cb.pm_mode_db[xx]);
801 old_state = p_cb->state;
802 p_cb->state = mode;
803 p_cb->interval = interval;
804
805 LOG_DEBUG("%s switched from %s to %s.", __func__, mode_to_string(old_state), mode_to_string(p_cb->state));
806
807 if ((p_lcb = l2cu_find_lcb_by_bd_addr(p->remote_addr, BT_TRANSPORT_BR_EDR)) != NULL)
808 {
809 if ((p_cb->state == BTM_PM_ST_ACTIVE) || (p_cb->state == BTM_PM_ST_SNIFF))
810 {
811 /* There might be any pending packets due to SNIFF or PENDING state */
812 /* Trigger L2C to start transmission of the pending packets. */
813 BTM_TRACE_DEBUG("btm mode change to active; check l2c_link for outgoing packets");
814 l2c_link_check_send_pkts(p_lcb, NULL, NULL);
815 }
816 }
817
818 /* notify registered parties */
819 for(yy=0; yy<=BTM_MAX_PM_RECORDS; yy++)
820 {
821 /* set req_mode HOLD mode->ACTIVE */
822 if( (mode == BTM_PM_MD_ACTIVE) && (p_cb->req_mode[yy].mode == BTM_PM_MD_HOLD) )
823 p_cb->req_mode[yy].mode = BTM_PM_MD_ACTIVE;
824 }
825
826 /* new request has been made. - post a message to BTU task */
827 if(old_state & BTM_PM_STORED_MASK)
828 {
829 #if BTM_PM_DEBUG == TRUE
830 BTM_TRACE_DEBUG( "btm_pm_proc_mode_change: Sending stored req:%d", xx);
831 #endif // BTM_PM_DEBUG
832 btm_pm_snd_md_req(BTM_PM_SET_ONLY_ID, xx, NULL);
833 }
834 else
835 {
836 for(zz=0; zz<MAX_L2CAP_LINKS; zz++)
837 {
838 if(btm_cb.pm_mode_db[zz].chg_ind == TRUE)
839 {
840 #if BTM_PM_DEBUG == TRUE
841 BTM_TRACE_DEBUG( "btm_pm_proc_mode_change: Sending PM req :%d", zz);
842 #endif // BTM_PM_DEBUG
843 btm_pm_snd_md_req(BTM_PM_SET_ONLY_ID, zz, NULL);
844 break;
845 }
846 }
847 }
848
849
850 /* notify registered parties */
851 for(yy=0; yy<BTM_MAX_PM_RECORDS; yy++)
852 {
853 if(btm_cb.pm_reg_db[yy].mask & BTM_PM_REG_NOTIF)
854 {
855 (*btm_cb.pm_reg_db[yy].cback)( p->remote_addr, mode, interval, hci_status);
856 }
857 }
858
859 /* If mode change was because of an active role switch or change link key */
860 btm_cont_rswitch(p, btm_find_dev(p->remote_addr), hci_status);
861 }
862
863 /*******************************************************************************
864 **
865 ** Function btm_pm_proc_ssr_evt
866 **
867 ** Description This function is called when an HCI sniff subrating event occurs.
868 **
869 ** Returns none.
870 **
871 *******************************************************************************/
872 #if (BTM_SSR_INCLUDED == TRUE)
btm_pm_proc_ssr_evt(UINT8 * p,UINT16 evt_len)873 void btm_pm_proc_ssr_evt (UINT8 *p, UINT16 evt_len)
874 {
875 UINT8 status;
876 UINT16 handle;
877 UINT16 max_rx_lat;
878 int xx, yy;
879 tBTM_PM_MCB *p_cb;
880 tACL_CONN *p_acl=NULL;
881 UINT16 use_ssr = TRUE;
882 UNUSED(evt_len);
883
884 STREAM_TO_UINT8 (status, p);
885
886 STREAM_TO_UINT16 (handle, p);
887 /* get the index to acl_db */
888 if ((xx = btm_handle_to_acl_index(handle)) >= MAX_L2CAP_LINKS)
889 return;
890
891 p += 2;
892 STREAM_TO_UINT16 (max_rx_lat, p);
893 p_cb = &(btm_cb.pm_mode_db[xx]);
894
895 p_acl = &btm_cb.acl_db[xx];
896 if(p_cb->interval == max_rx_lat)
897 {
898 /* using legacy sniff */
899 use_ssr = FALSE;
900 }
901
902 /* notify registered parties */
903 for(yy=0; yy<BTM_MAX_PM_RECORDS; yy++)
904 {
905 if(btm_cb.pm_reg_db[yy].mask & BTM_PM_REG_NOTIF)
906 {
907 if( p_acl)
908 {
909 (*btm_cb.pm_reg_db[yy].cback)( p_acl->remote_addr, BTM_PM_STS_SSR, use_ssr, status);
910 }
911 }
912 }
913 }
914 #endif // BTM_SSR_INCLUDED
915
916 /*******************************************************************************
917 **
918 ** Function btm_pm_device_in_active_or_sniff_mode
919 **
920 ** Description This function is called to check if in active or sniff mode
921 **
922 ** Returns TRUE, if in active or sniff mode
923 **
924 *******************************************************************************/
btm_pm_device_in_active_or_sniff_mode(void)925 BOOLEAN btm_pm_device_in_active_or_sniff_mode(void)
926 {
927 /* The active state is the highest state-includes connected device and sniff mode*/
928
929 /* Covers active and sniff modes */
930 if (BTM_GetNumAclLinks() > 0)
931 {
932 BTM_TRACE_DEBUG("%s - ACL links: %d", __func__, BTM_GetNumAclLinks());
933 return TRUE;
934 }
935
936 #if ((defined BLE_INCLUDED) && (BLE_INCLUDED == TRUE))
937 /* Check BLE states */
938 if (btm_ble_get_conn_st() != BLE_CONN_IDLE)
939 {
940 BTM_TRACE_DEBUG("%s - BLE state: %x", __func__, btm_ble_get_conn_st());
941 return TRUE;
942 }
943 #endif
944
945 return FALSE;
946 }
947
948 /*******************************************************************************
949 **
950 ** Function btm_pm_device_in_scan_state
951 **
952 ** Description This function is called to check if in paging, inquiry or connecting mode
953 **
954 ** Returns TRUE, if in paging, inquiry or connecting mode
955 **
956 *******************************************************************************/
btm_pm_device_in_scan_state(void)957 BOOLEAN btm_pm_device_in_scan_state(void)
958 {
959 /* Scan state-paging, inquiry, and trying to connect */
960
961 /* Check for paging */
962 if (btm_cb.is_paging || GKI_queue_length(&btm_cb.page_queue) > 0 ||
963 BTM_BL_PAGING_STARTED == btm_cb.busy_level)
964 {
965 BTM_TRACE_DEBUG("btm_pm_device_in_scan_state- paging");
966 return TRUE;
967 }
968
969 /* Check for inquiry */
970 if ((btm_cb.btm_inq_vars.inq_active & (BTM_BR_INQ_ACTIVE_MASK | BTM_BLE_INQ_ACTIVE_MASK)) != 0)
971 {
972 BTM_TRACE_DEBUG("btm_pm_device_in_scan_state- Inq active");
973 return TRUE;
974 }
975
976 return FALSE;
977 }
978
979 /*******************************************************************************
980 **
981 ** Function BTM_PM_ReadControllerState
982 **
983 ** Description This function is called to obtain the controller state
984 **
985 ** Returns Controller State-BTM_CONTRL_ACTIVE, BTM_CONTRL_SCAN, and BTM_CONTRL_IDLE
986 **
987 *******************************************************************************/
BTM_PM_ReadControllerState(void)988 tBTM_CONTRL_STATE BTM_PM_ReadControllerState(void)
989 {
990 if (TRUE == btm_pm_device_in_active_or_sniff_mode())
991 return BTM_CONTRL_ACTIVE;
992 else
993 if (TRUE == btm_pm_device_in_scan_state())
994 return BTM_CONTRL_SCAN;
995 else
996 return BTM_CONTRL_IDLE;
997 }
998
mode_to_string(tBTM_PM_MODE mode)999 static const char *mode_to_string(tBTM_PM_MODE mode) {
1000 switch (mode) {
1001 case BTM_PM_MD_ACTIVE: return "ACTIVE";
1002 case BTM_PM_MD_SNIFF: return "SNIFF";
1003 case BTM_PM_MD_PARK: return "PARK";
1004 case BTM_PM_MD_HOLD: return "HOLD";
1005 default: return "UNKNOWN";
1006 }
1007 }
1008