nfa_sys_ptim.c revision e9df6ba5a8fcccf306a80b1670b423be8fe7746a
1/******************************************************************************
2 *
3 *  Copyright (C) 2010-2012 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 *  Protocol timer services (taken from bta ptim)
22 *
23 ******************************************************************************/
24
25#include "nfc_target.h"
26#include "gki.h"
27#include "nfa_sys_ptim.h"
28#include "nfa_sys.h"
29#include "nfa_sys_int.h"
30
31/*******************************************************************************
32**
33** Function         nfa_sys_ptim_init
34**
35** Description      Initialize a protocol timer control block.  Parameter
36**                  period is the GKI timer period in milliseconds.  Parameter
37**                  timer_id is the GKI timer id.
38**
39** Returns          void
40**
41*******************************************************************************/
42void nfa_sys_ptim_init (tPTIM_CB *p_cb, UINT16 period, UINT8 timer_id)
43{
44    GKI_init_timer_list (&p_cb->timer_queue);
45    p_cb->period = period;
46    p_cb->timer_id = timer_id;
47}
48
49/*******************************************************************************
50**
51** Function         nfa_sys_ptim_timer_update
52**
53** Description      Update the protocol timer list and handle expired timers.
54**                  This function is called from the task running the protocol
55**                  timers when the periodic GKI timer expires.
56**
57** Returns          void
58**
59*******************************************************************************/
60void nfa_sys_ptim_timer_update (tPTIM_CB *p_cb)
61{
62    TIMER_LIST_ENT *p_tle;
63    BT_HDR *p_msg;
64    UINT32 new_ticks_count;
65    INT32  period_in_ticks;
66
67    /* To handle the case when the function is called less frequently than the period
68       we must convert determine the number of ticks since the last update, then
69       convert back to milliseconds before updating timer list */
70    new_ticks_count = GKI_get_tick_count ();
71
72    /* Check for wrapped condition */
73    if (new_ticks_count >= p_cb->last_gki_ticks)
74    {
75        period_in_ticks = (INT32) (new_ticks_count - p_cb->last_gki_ticks);
76    }
77    else
78    {
79        period_in_ticks = (INT32) (((UINT32) 0xffffffff - p_cb->last_gki_ticks)
80                            + new_ticks_count + 1);
81    }
82
83    /* update timer list */
84    GKI_update_timer_list (&p_cb->timer_queue, GKI_TICKS_TO_MS (period_in_ticks));
85
86    p_cb->last_gki_ticks = new_ticks_count;
87
88    /* while there are expired timers */
89    while ((p_cb->timer_queue.p_first) && (p_cb->timer_queue.p_first->ticks <= 0))
90    {
91        /* removed expired timer from list */
92        p_tle = p_cb->timer_queue.p_first;
93        NFA_TRACE_DEBUG1 ("nfa_sys_ptim_timer_update expired: %08x", 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        {
99            (*p_tle->p_cback) (p_tle);
100        }
101        else if (p_tle->event)
102        {
103            if ((p_msg = (BT_HDR *) GKI_getbuf (sizeof (BT_HDR))) != NULL)
104            {
105                p_msg->event = p_tle->event;
106                p_msg->layer_specific = 0;
107                nfa_sys_sendmsg (p_msg);
108            }
109        }
110    }
111
112    /* if timer list is empty stop periodic GKI timer */
113    if (p_cb->timer_queue.p_first == NULL)
114    {
115        NFA_TRACE_DEBUG0 ("ptim timer stop");
116        GKI_stop_timer (p_cb->timer_id);
117    }
118}
119
120/*******************************************************************************
121**
122** Function         nfa_sys_ptim_start_timer
123**
124** Description      Start a protocol timer for the specified amount
125**                  of time in seconds.
126**
127** Returns          void
128**
129*******************************************************************************/
130void nfa_sys_ptim_start_timer (tPTIM_CB *p_cb, TIMER_LIST_ENT *p_tle, UINT16 type, INT32 timeout)
131{
132    NFA_TRACE_DEBUG1 ("nfa_sys_ptim_start_timer %08x", p_tle);
133
134    /* if timer list is currently empty, start periodic GKI timer */
135    if (p_cb->timer_queue.p_first == NULL)
136    {
137        NFA_TRACE_DEBUG0 ("ptim timer start");
138        p_cb->last_gki_ticks = GKI_get_tick_count ();
139        GKI_start_timer (p_cb->timer_id, GKI_MS_TO_TICKS (p_cb->period), TRUE);
140    }
141
142    GKI_remove_from_timer_list (&p_cb->timer_queue, p_tle);
143
144    p_tle->event = type;
145    p_tle->ticks = timeout;
146
147    GKI_add_to_timer_list (&p_cb->timer_queue, p_tle);
148}
149
150/*******************************************************************************
151**
152** Function         nfa_sys_ptim_stop_timer
153**
154** Description      Stop a protocol timer.
155**
156** Returns          void
157**
158*******************************************************************************/
159void nfa_sys_ptim_stop_timer (tPTIM_CB *p_cb, TIMER_LIST_ENT *p_tle)
160{
161    NFA_TRACE_DEBUG1 ("nfa_sys_ptim_stop_timer %08x", p_tle);
162
163    GKI_remove_from_timer_list (&p_cb->timer_queue, p_tle);
164
165    /* if timer list is empty stop periodic GKI timer */
166    if (p_cb->timer_queue.p_first == NULL)
167    {
168        NFA_TRACE_DEBUG0 ("ptim timer stop");
169        GKI_stop_timer (p_cb->timer_id);
170    }
171}
172