cregit-Linux how code gets into the kernel

Release 4.7 sound/oss/sys_timer.c

Directory: sound/oss
/*
 * sound/oss/sys_timer.c
 *
 * The default timer for the Level 2 sequencer interface
 * Uses the (1/HZ sec) timer of kernel.
 */
/*
 * 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)
 * Andrew Veliath  : adapted tmr2ticks from level 1 sequencer (avoid overflow)
 */
#include <linux/spinlock.h>
#include "sound_config.h"



static volatile int 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 void     poll_def_tmr(unsigned long dummy);
static DEFINE_SPINLOCK(lock);
static DEFINE_TIMER(def_tmr, poll_def_tmr, 0, 0);


static unsigned long tmr2ticks(int tmr_value) { /* * Convert timer ticks to MIDI ticks */ unsigned long tmp; unsigned long scale; /* tmr_value (ticks per sec) * 1000000 (usecs per sec) / HZ (ticks per sec) -=> usecs */ tmp = tmr_value * (1000000 / HZ); scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */ return (tmp + scale / 2) / scale; }

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static void poll_def_tmr(unsigned long dummy) { if (!opened) return; def_tmr.expires = (1) + jiffies; add_timer(&def_tmr); if (!tmr_running) return; spin_lock(&lock); 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(&lock); }

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dan carpenterdan carpenter44.76%116.67%
Total84100.00%6100.00%


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); }

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Total57100.00%3100.00%


static int def_tmr_open(int dev, int mode) { if (opened) return -EBUSY; tmr_reset(); curr_tempo = 60; curr_timebase = 100; opened = 1; { def_tmr.expires = (1) + jiffies; add_timer(&def_tmr); } return 0; }

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static void def_tmr_close(int dev) { opened = tmr_running = 0; del_timer(&def_tmr); }

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static int def_tmr_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; break; case TMR_STOP: tmr_running = 0; break; case TMR_CONTINUE: tmr_running = 1; break; case TMR_TEMPO: if (parm) { if (parm < 8) parm = 8; if (parm > 360) parm = 360; tmr_offs = tmr_ctr; ticks_offs += tmr2ticks(tmr_ctr); tmr_ctr = 0; curr_tempo = parm; } break; case TMR_ECHO: seq_copy_to_input(event, 8); break; default:; } return TIMER_NOT_ARMED; }

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

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/* same as sound_timer.c:timer_ioctl!? */
static int def_tmr_ioctl(int dev, unsigned int cmd, void __user *arg) { int __user *p = arg; int val; switch (cmd) { case SNDCTL_TMR_SOURCE: return __put_user(TMR_INTERNAL, p); 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; } return __put_user(curr_timebase, p); 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(); } return __put_user(curr_tempo, p); 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; return __put_user(val, p); case SNDCTL_SEQ_GETTIME: return __put_user(curr_ticks, p); case SNDCTL_TMR_METRONOME: /* NOP */ break; default:; } return -EINVAL; }

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static void def_tmr_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; }

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struct sound_timer_operations default_sound_timer = { .owner = THIS_MODULE, .info = {"System clock", 0}, .priority = 0, /* Priority */ .devlink = 0, /* Local device link */ .open = def_tmr_open, .close = def_tmr_close, .event = def_tmr_event, .get_time = def_tmr_get_time, .ioctl = def_tmr_ioctl, .arm_timer = def_tmr_arm };

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pre-gitpre-git85291.22%1055.56%
peter waechtlerpeter waechtler252.68%15.56%
alan coxalan cox202.14%15.56%
al viroal viro181.93%15.56%
andrew mortonandrew morton60.64%15.56%
thomas gleixnerthomas gleixner40.43%15.56%
ingo molnaringo molnar40.43%15.56%
dan carpenterdan carpenter40.43%15.56%
uwe zeisbergeruwe zeisberger10.11%15.56%
Total934100.00%18100.00%
Directory: sound/oss
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