Initial import

1 files changed, 280 insertions, 0 deletions

diff --git a/sound/oss/sys_timer.c b/sound/oss/sys_timer.c
new file mode 100644
index 000000000..2226dda0e
--- /dev/null
+++ b/sound/oss/sys_timer.c
@@ -0,0 +1,280 @@
+/*
+ * 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;
+}
+
+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);
+}
+
+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
+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;
+}
+
+/* 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;
+}
+
+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 =
+{
+	.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
+};