Revision 8874e812feb4926f4a51a82c4fca75c7daa05fc5 authored by Linus Torvalds on 21 June 2012, 20:41:07 UTC, committed by Linus Torvalds on 21 June 2012, 20:41:07 UTC
Pull btrfs fixes from Chris Mason: "This is a small pull with btrfs fixes. The biggest of the bunch is another fix for the new backref walking code. We're still hammering out one btrfs dio vs buffered reads problem, but that one will have to wait for the next rc." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: Btrfs: delay iput with async extents Btrfs: add a missing spin_lock Btrfs: don't assume to be on the correct extent in add_all_parents Btrfs: introduce btrfs_next_old_item
sound_timer.c
/*
* sound/oss/sound_timer.c
*/
/*
* Copyright (C) by Hannu Savolainen 1993-1997
*
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this software
* for more info.
*/
/*
* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
*/
#include <linux/string.h>
#include <linux/spinlock.h>
#include "sound_config.h"
static volatile int initialized, opened, tmr_running;
static volatile time_t tmr_offs, tmr_ctr;
static volatile unsigned long ticks_offs;
static volatile int curr_tempo, curr_timebase;
static volatile unsigned long curr_ticks;
static volatile unsigned long next_event_time;
static unsigned long prev_event_time;
static volatile unsigned long usecs_per_tmr; /* Length of the current interval */
static struct sound_lowlev_timer *tmr;
static DEFINE_SPINLOCK(lock);
static unsigned long tmr2ticks(int tmr_value)
{
/*
* Convert timer ticks to MIDI ticks
*/
unsigned long tmp;
unsigned long scale;
tmp = tmr_value * usecs_per_tmr; /* Convert to usecs */
scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */
return (tmp + (scale / 2)) / scale;
}
void reprogram_timer(void)
{
unsigned long usecs_per_tick;
/*
* The user is changing the timer rate before setting a timer
* slap, bad bad not allowed.
*/
if(!tmr)
return;
usecs_per_tick = (60 * 1000000) / (curr_tempo * curr_timebase);
/*
* Don't kill the system by setting too high timer rate
*/
if (usecs_per_tick < 2000)
usecs_per_tick = 2000;
usecs_per_tmr = tmr->tmr_start(tmr->dev, usecs_per_tick);
}
void sound_timer_syncinterval(unsigned int new_usecs)
{
/*
* This routine is called by the hardware level if
* the clock frequency has changed for some reason.
*/
tmr_offs = tmr_ctr;
ticks_offs += tmr2ticks(tmr_ctr);
tmr_ctr = 0;
usecs_per_tmr = new_usecs;
}
EXPORT_SYMBOL(sound_timer_syncinterval);
static void tmr_reset(void)
{
unsigned long flags;
spin_lock_irqsave(&lock,flags);
tmr_offs = 0;
ticks_offs = 0;
tmr_ctr = 0;
next_event_time = (unsigned long) -1;
prev_event_time = 0;
curr_ticks = 0;
spin_unlock_irqrestore(&lock,flags);
}
static int timer_open(int dev, int mode)
{
if (opened)
return -EBUSY;
tmr_reset();
curr_tempo = 60;
curr_timebase = 100;
opened = 1;
reprogram_timer();
return 0;
}
static void timer_close(int dev)
{
opened = tmr_running = 0;
tmr->tmr_disable(tmr->dev);
}
static int timer_event(int dev, unsigned char *event)
{
unsigned char cmd = event[1];
unsigned long parm = *(int *) &event[4];
switch (cmd)
{
case TMR_WAIT_REL:
parm += prev_event_time;
case TMR_WAIT_ABS:
if (parm > 0)
{
long time;
if (parm <= curr_ticks) /* It's the time */
return TIMER_NOT_ARMED;
time = parm;
next_event_time = prev_event_time = time;
return TIMER_ARMED;
}
break;
case TMR_START:
tmr_reset();
tmr_running = 1;
reprogram_timer();
break;
case TMR_STOP:
tmr_running = 0;
break;
case TMR_CONTINUE:
tmr_running = 1;
reprogram_timer();
break;
case TMR_TEMPO:
if (parm)
{
if (parm < 8)
parm = 8;
if (parm > 250)
parm = 250;
tmr_offs = tmr_ctr;
ticks_offs += tmr2ticks(tmr_ctr);
tmr_ctr = 0;
curr_tempo = parm;
reprogram_timer();
}
break;
case TMR_ECHO:
seq_copy_to_input(event, 8);
break;
default:;
}
return TIMER_NOT_ARMED;
}
static unsigned long timer_get_time(int dev)
{
if (!opened)
return 0;
return curr_ticks;
}
static int timer_ioctl(int dev, unsigned int cmd, void __user *arg)
{
int __user *p = arg;
int val;
switch (cmd)
{
case SNDCTL_TMR_SOURCE:
val = TMR_INTERNAL;
break;
case SNDCTL_TMR_START:
tmr_reset();
tmr_running = 1;
return 0;
case SNDCTL_TMR_STOP:
tmr_running = 0;
return 0;
case SNDCTL_TMR_CONTINUE:
tmr_running = 1;
return 0;
case SNDCTL_TMR_TIMEBASE:
if (get_user(val, p))
return -EFAULT;
if (val)
{
if (val < 1)
val = 1;
if (val > 1000)
val = 1000;
curr_timebase = val;
}
val = curr_timebase;
break;
case SNDCTL_TMR_TEMPO:
if (get_user(val, p))
return -EFAULT;
if (val)
{
if (val < 8)
val = 8;
if (val > 250)
val = 250;
tmr_offs = tmr_ctr;
ticks_offs += tmr2ticks(tmr_ctr);
tmr_ctr = 0;
curr_tempo = val;
reprogram_timer();
}
val = curr_tempo;
break;
case SNDCTL_SEQ_CTRLRATE:
if (get_user(val, p))
return -EFAULT;
if (val != 0) /* Can't change */
return -EINVAL;
val = ((curr_tempo * curr_timebase) + 30) / 60;
break;
case SNDCTL_SEQ_GETTIME:
val = curr_ticks;
break;
case SNDCTL_TMR_METRONOME:
default:
return -EINVAL;
}
return put_user(val, p);
}
static void timer_arm(int dev, long time)
{
if (time < 0)
time = curr_ticks + 1;
else if (time <= curr_ticks) /* It's the time */
return;
next_event_time = prev_event_time = time;
return;
}
static struct sound_timer_operations sound_timer =
{
.owner = THIS_MODULE,
.info = {"Sound Timer", 0},
.priority = 1, /* Priority */
.devlink = 0, /* Local device link */
.open = timer_open,
.close = timer_close,
.event = timer_event,
.get_time = timer_get_time,
.ioctl = timer_ioctl,
.arm_timer = timer_arm
};
void sound_timer_interrupt(void)
{
unsigned long flags;
if (!opened)
return;
tmr->tmr_restart(tmr->dev);
if (!tmr_running)
return;
spin_lock_irqsave(&lock,flags);
tmr_ctr++;
curr_ticks = ticks_offs + tmr2ticks(tmr_ctr);
if (curr_ticks >= next_event_time)
{
next_event_time = (unsigned long) -1;
sequencer_timer(0);
}
spin_unlock_irqrestore(&lock,flags);
}
EXPORT_SYMBOL(sound_timer_interrupt);
void sound_timer_init(struct sound_lowlev_timer *t, char *name)
{
int n;
if (initialized)
{
if (t->priority <= tmr->priority)
return; /* There is already a similar or better timer */
tmr = t;
return;
}
initialized = 1;
tmr = t;
n = sound_alloc_timerdev();
if (n == -1)
n = 0; /* Overwrite the system timer */
strlcpy(sound_timer.info.name, name, sizeof(sound_timer.info.name));
sound_timer_devs[n] = &sound_timer;
}
EXPORT_SYMBOL(sound_timer_init);
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...