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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [sound/] [sys_timer.c] - Rev 1772
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/* * sound/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 1993-1996 * * USS/Lite 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. */ #include <linux/config.h> #define SEQUENCER_C #include "sound_config.h" #ifdef CONFIG_SEQUENCER static volatile int opened = 0, tmr_running = 0; 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 struct timer_list def_tmr = {NULL, NULL, 0, 0, poll_def_tmr}; static unsigned long tmr2ticks (int tmr_value) { /* * Convert system timer ticks (HZ) to MIDI ticks * (divide # of MIDI ticks/minute by # of system ticks/minute). */ return ((tmr_value * curr_tempo * curr_timebase) + (30 * 100)) / (60 * HZ); } static void poll_def_tmr (unsigned long dummy) { if (opened) { { def_tmr.expires = (1) + jiffies; add_timer (&def_tmr); }; if (tmr_running) { tmr_ctr++; curr_ticks = ticks_offs + tmr2ticks (tmr_ctr); if (curr_ticks >= next_event_time) { next_event_time = (unsigned long) -1; sequencer_timer (0); } } } } static void tmr_reset (void) { unsigned long flags; save_flags (flags); cli (); tmr_offs = 0; ticks_offs = 0; tmr_ctr = 0; next_event_time = (unsigned long) -1; prev_event_time = 0; curr_ticks = 0; restore_flags (flags); } 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; } static void def_tmr_close (int dev) { opened = tmr_running = 0; del_timer (&def_tmr);; } 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; } static unsigned long def_tmr_get_time (int dev) { if (!opened) return 0; return curr_ticks; } static int def_tmr_ioctl (int dev, unsigned int cmd, caddr_t arg) { switch (cmd) { case SNDCTL_TMR_SOURCE: return snd_ioctl_return ((int *) arg, TMR_INTERNAL); break; case SNDCTL_TMR_START: tmr_reset (); tmr_running = 1; return 0; break; case SNDCTL_TMR_STOP: tmr_running = 0; return 0; break; case SNDCTL_TMR_CONTINUE: tmr_running = 1; return 0; break; case SNDCTL_TMR_TIMEBASE: { int val = get_user ((int *) arg); if (val) { if (val < 1) val = 1; if (val > 1000) val = 1000; curr_timebase = val; } return snd_ioctl_return ((int *) arg, curr_timebase); } break; case SNDCTL_TMR_TEMPO: { int val = get_user ((int *) arg); 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; } return snd_ioctl_return ((int *) arg, curr_tempo); } break; case SNDCTL_SEQ_CTRLRATE: if (get_user ((int *) arg) != 0) /* Can't change */ return -(EINVAL); return snd_ioctl_return ((int *) arg, ((curr_tempo * curr_timebase) + 30) / 60); break; case SNDCTL_TMR_METRONOME: /* NOP */ break; default:; } return -(EINVAL); } 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; } struct sound_timer_operations default_sound_timer = { {"System clock", 0}, 0, /* Priority */ 0, /* Local device link */ def_tmr_open, def_tmr_close, def_tmr_event, def_tmr_get_time, def_tmr_ioctl, def_tmr_arm }; #endif
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