4 * The default timer for the Level 2 sequencer interface
5 * Uses the (1/HZ sec) timer of kernel.
8 * Copyright (C) by Hannu Savolainen 1993-1997
10 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
11 * Version 2 (June 1991). See the "COPYING" file distributed with this software
15 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
16 * Andrew Veliath : adapted tmr2ticks from level 1 sequencer (avoid overflow)
18 #include "sound_config.h"
20 static volatile int opened = 0, tmr_running = 0;
21 static volatile time_t tmr_offs, tmr_ctr;
22 static volatile unsigned long ticks_offs;
23 static volatile int curr_tempo, curr_timebase;
24 static volatile unsigned long curr_ticks;
25 static volatile unsigned long next_event_time;
26 static unsigned long prev_event_time;
28 static void poll_def_tmr(unsigned long dummy);
31 static struct timer_list def_tmr =
32 {function: poll_def_tmr};
35 tmr2ticks(int tmr_value)
38 * Convert timer ticks to MIDI ticks
44 /* tmr_value (ticks per sec) *
45 1000000 (usecs per sec) / HZ (ticks per sec) -=> usecs */
46 tmp = tmr_value * (1000000 / HZ);
47 scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */
48 return (tmp + scale / 2) / scale;
52 poll_def_tmr(unsigned long dummy)
59 def_tmr.expires = (1) + jiffies;
66 curr_ticks = ticks_offs + tmr2ticks(tmr_ctr);
68 if (curr_ticks >= next_event_time)
70 next_event_time = (unsigned long) -1;
87 next_event_time = (unsigned long) -1;
94 def_tmr_open(int dev, int mode)
107 def_tmr.expires = (1) + jiffies;
115 def_tmr_close(int dev)
117 opened = tmr_running = 0;
118 del_timer(&def_tmr);;
122 def_tmr_event(int dev, unsigned char *event)
124 unsigned char cmd = event[1];
125 unsigned long parm = *(int *) &event[4];
130 parm += prev_event_time;
136 if (parm <= curr_ticks) /* It's the time */
137 return TIMER_NOT_ARMED;
140 next_event_time = prev_event_time = time;
167 ticks_offs += tmr2ticks(tmr_ctr);
174 seq_copy_to_input(event, 8);
180 return TIMER_NOT_ARMED;
184 def_tmr_get_time(int dev)
192 /* same as sound_timer.c:timer_ioctl!? */
193 static int def_tmr_ioctl(int dev, unsigned int cmd, caddr_t arg)
198 case SNDCTL_TMR_SOURCE:
199 return __put_user(TMR_INTERNAL, (int *)arg);
201 case SNDCTL_TMR_START:
206 case SNDCTL_TMR_STOP:
210 case SNDCTL_TMR_CONTINUE:
214 case SNDCTL_TMR_TIMEBASE:
215 if (__get_user(val, (int *)arg))
224 return __put_user(curr_timebase, (int *)arg);
226 case SNDCTL_TMR_TEMPO:
227 if (__get_user(val, (int *)arg))
235 ticks_offs += tmr2ticks(tmr_ctr);
240 return __put_user(curr_tempo, (int *)arg);
242 case SNDCTL_SEQ_CTRLRATE:
243 if (__get_user(val, (int *)arg))
245 if (val != 0) /* Can't change */
247 val = ((curr_tempo * curr_timebase) + 30) / 60;
248 return __put_user(val, (int *)arg);
250 case SNDCTL_SEQ_GETTIME:
251 return __put_user(curr_ticks, (int *)arg);
253 case SNDCTL_TMR_METRONOME:
263 def_tmr_arm(int dev, long time)
266 time = curr_ticks + 1;
267 else if (time <= curr_ticks) /* It's the time */
270 next_event_time = prev_event_time = time;
275 struct sound_timer_operations default_sound_timer =
278 info: {"System clock", 0},
279 priority: 0, /* Priority */
280 devlink: 0, /* Local device link */
282 close: def_tmr_close,
283 event: def_tmr_event,
284 get_time: def_tmr_get_time,
285 ioctl: def_tmr_ioctl,
286 arm_timer: def_tmr_arm