cregit-Linux how code gets into the kernel

Release 4.7 sound/oss/sound_timer.c

Directory: sound/oss
/*
 * 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; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git54100.00%2100.00%
Total54100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git56100.00%5100.00%
Total56100.00%5100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git29100.00%3100.00%
Total29100.00%3100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git4985.96%266.67%
peter waechtlerpeter waechtler814.04%133.33%
Total57100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git41100.00%3100.00%
Total41100.00%3100.00%


static void timer_close(int dev) { opened = tmr_running = 0; tmr->tmr_disable(tmr->dev); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git24100.00%2100.00%
Total24100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git190100.00%2100.00%
Total190100.00%2100.00%


static unsigned long timer_get_time(int dev) { if (!opened) return 0; return curr_ticks; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git21100.00%1100.00%
Total21100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git24794.64%787.50%
al viroal viro145.36%112.50%
Total261100.00%8100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git40100.00%1100.00%
Total40100.00%1100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git6275.61%583.33%
peter waechtlerpeter waechtler2024.39%116.67%
Total82100.00%6100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git8389.25%583.33%
dan carpenterdan carpenter1010.75%116.67%
Total93100.00%6100.00%

EXPORT_SYMBOL(sound_timer_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git100691.21%1568.18%
peter waechtlerpeter waechtler332.99%14.55%
alan coxalan cox201.81%14.55%
adrian bunkadrian bunk151.36%14.55%
al viroal viro141.27%14.55%
dan carpenterdan carpenter100.91%14.55%
akinobu mitaakinobu mita40.36%14.55%
uwe zeisbergeruwe zeisberger10.09%14.55%
Total1103100.00%22100.00%
Directory: sound/oss
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
{% endraw %}