1/******************************************************************************
2 *
3 *  Copyright (C) 2010-2014 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 *  Protocol timer services (taken from bta ptim)
22 *
23 ******************************************************************************/
24#include <android-base/stringprintf.h>
25#include <base/logging.h>
26
27#include "nfa_sys_ptim.h"
28#include "nfa_sys.h"
29
30using android::base::StringPrintf;
31
32extern bool nfc_debug_enabled;
33
34/*******************************************************************************
35**
36** Function         nfa_sys_ptim_init
37**
38** Description      Initialize a protocol timer control block.  Parameter
39**                  period is the GKI timer period in milliseconds.  Parameter
40**                  timer_id is the GKI timer id.
41**
42** Returns          void
43**
44*******************************************************************************/
45void nfa_sys_ptim_init(tPTIM_CB* p_cb, uint16_t period, uint8_t timer_id) {
46  GKI_init_timer_list(&p_cb->timer_queue);
47  p_cb->period = period;
48  p_cb->timer_id = timer_id;
49}
50
51/*******************************************************************************
52**
53** Function         nfa_sys_ptim_timer_update
54**
55** Description      Update the protocol timer list and handle expired timers.
56**                  This function is called from the task running the protocol
57**                  timers when the periodic GKI timer expires.
58**
59** Returns          void
60**
61*******************************************************************************/
62void nfa_sys_ptim_timer_update(tPTIM_CB* p_cb) {
63  TIMER_LIST_ENT* p_tle;
64  NFC_HDR* p_msg;
65  uint32_t new_ticks_count;
66  int32_t period_in_ticks;
67
68  /* To handle the case when the function is called less frequently than the
69     period
70     we must convert determine the number of ticks since the last update, then
71     convert back to milliseconds before updating timer list */
72  new_ticks_count = GKI_get_tick_count();
73
74  /* Check for wrapped condition */
75  if (new_ticks_count >= p_cb->last_gki_ticks) {
76    period_in_ticks = (int32_t)(new_ticks_count - p_cb->last_gki_ticks);
77  } else {
78    period_in_ticks = (int32_t)(((uint32_t)0xffffffff - p_cb->last_gki_ticks) +
79                                new_ticks_count + 1);
80  }
81
82  /* update timer list */
83  GKI_update_timer_list(&p_cb->timer_queue, GKI_TICKS_TO_MS(period_in_ticks));
84
85  p_cb->last_gki_ticks = new_ticks_count;
86
87  /* while there are expired timers */
88  while ((p_cb->timer_queue.p_first) &&
89         (p_cb->timer_queue.p_first->ticks <= 0)) {
90    /* removed expired timer from list */
91    p_tle = p_cb->timer_queue.p_first;
92    DLOG_IF(INFO, nfc_debug_enabled)
93        << StringPrintf("nfa_sys_ptim_timer_update expired: %p", p_tle);
94    GKI_remove_from_timer_list(&p_cb->timer_queue, p_tle);
95
96    /* call timer callback */
97    if (p_tle->p_cback) {
98      (*p_tle->p_cback)(p_tle);
99    } else if (p_tle->event) {
100      p_msg = (NFC_HDR*)GKI_getbuf(sizeof(NFC_HDR));
101      if (p_msg != NULL) {
102        p_msg->event = p_tle->event;
103        p_msg->layer_specific = 0;
104        nfa_sys_sendmsg(p_msg);
105      }
106    }
107  }
108
109  /* if timer list is empty stop periodic GKI timer */
110  if (p_cb->timer_queue.p_first == NULL) {
111    DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("ptim timer stop");
112    GKI_stop_timer(p_cb->timer_id);
113  }
114}
115
116/*******************************************************************************
117**
118** Function         nfa_sys_ptim_start_timer
119**
120** Description      Start a protocol timer for the specified amount
121**                  of time in seconds.
122**
123** Returns          void
124**
125*******************************************************************************/
126void nfa_sys_ptim_start_timer(tPTIM_CB* p_cb, TIMER_LIST_ENT* p_tle,
127                              uint16_t type, int32_t timeout) {
128  DLOG_IF(INFO, nfc_debug_enabled)
129      << StringPrintf("nfa_sys_ptim_start_timer %p", p_tle);
130
131  /* if timer list is currently empty, start periodic GKI timer */
132  if (p_cb->timer_queue.p_first == NULL) {
133    DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("ptim timer start");
134    p_cb->last_gki_ticks = GKI_get_tick_count();
135    GKI_start_timer(p_cb->timer_id, GKI_MS_TO_TICKS(p_cb->period), true);
136  }
137
138  GKI_remove_from_timer_list(&p_cb->timer_queue, p_tle);
139
140  p_tle->event = type;
141  p_tle->ticks = timeout;
142
143  GKI_add_to_timer_list(&p_cb->timer_queue, p_tle);
144}
145
146/*******************************************************************************
147**
148** Function         nfa_sys_ptim_stop_timer
149**
150** Description      Stop a protocol timer.
151**
152** Returns          void
153**
154*******************************************************************************/
155void nfa_sys_ptim_stop_timer(tPTIM_CB* p_cb, TIMER_LIST_ENT* p_tle) {
156  DLOG_IF(INFO, nfc_debug_enabled)
157      << StringPrintf("nfa_sys_ptim_stop_timer %p", p_tle);
158
159  GKI_remove_from_timer_list(&p_cb->timer_queue, p_tle);
160
161  /* if timer list is empty stop periodic GKI timer */
162  if (p_cb->timer_queue.p_first == NULL) {
163    DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("ptim timer stop");
164    GKI_stop_timer(p_cb->timer_id);
165  }
166}
167