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/*
* Driver for Digigram pcxhr compatible soundcards
*
* Copyright (c) 2004 by Digigram <alsa@digigram.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pcxhr_hrtimer.h"
void pcxhr_hr_timer_tasklet(unsigned long data)
{
pcxhr_interrupt(0, (void*)data);
}
enum hrtimer_restart pcxhr_hr_timer_callback(struct hrtimer* hr_timer)
{
struct pcxhr_mgr *mgr;
mgr = container_of(hr_timer, struct pcxhr_mgr, hr_timer);
if (!atomic_read(&mgr->hr_timer_running))
return HRTIMER_NORESTART;
tasklet_schedule(&mgr->hr_timer_tasklet);
hrtimer_forward_now(hr_timer, mgr->hr_timer_period_time);
return HRTIMER_RESTART;
}
void pcxhr_hr_timer_trig(struct pcxhr_mgr *mgr, int start, unsigned int rate) {
if (start)
{
unsigned int period = mgr->granularity/2;
long sec;
unsigned long nsecs;
sec = period/rate;
period %= rate;
nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
tasklet_kill(&mgr->hr_timer_tasklet); // Make sure the tasklet is not running.
mgr->hr_timer_period_time = ktime_set(sec, nsecs);
atomic_set(&mgr->hr_timer_running, 1);
hrtimer_start(&mgr->hr_timer, mgr->hr_timer_period_time, HRTIMER_MODE_REL);
}
else
{
atomic_set(&mgr->hr_timer_running, 0);
hrtimer_cancel(&mgr->hr_timer);
}
}
void pcxhr_hr_timer_init(struct pcxhr_mgr *mgr) {
hrtimer_init( &mgr->hr_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL );
mgr->hr_timer.function = pcxhr_hr_timer_callback;
atomic_set(&mgr->hr_timer_running, 0);
tasklet_init(&mgr->hr_timer_tasklet, pcxhr_hr_timer_tasklet,
(unsigned long)mgr);
}
void pcxhr_hr_timer_kill(struct pcxhr_mgr *mgr) {
tasklet_kill(&mgr->hr_timer_tasklet);
}
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