patch-2.3.99-pre6 linux/drivers/sound/emu10k1/timer.c

• Lines: 177
• Date: Fri Apr 21 16:08:45 2000
• Orig file: v2.3.99-pre5/linux/drivers/sound/emu10k1/timer.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre5/linux/drivers/sound/emu10k1/timer.c linux/drivers/sound/emu10k1/timer.c
@@ -0,0 +1,176 @@
+
+/*
+ **********************************************************************
+ *     timer.c
+ *     Copyright (C) 1999, 2000 Creative Labs, inc.
+ *
+ **********************************************************************
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License as
+ *     published by the Free Software Foundation; either version 2 of
+ *     the License, or (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public
+ *     License along with this program; if not, write to the Free
+ *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
+ *     USA.
+ *
+ **********************************************************************
+ */
+
+/* 3/6/2000	Improved support for different timer delays  Rui Sousa */
+
+/* 4/3/2000	Implemented timer list using list.h 	     Rui Sousa */
+
+#include "hwaccess.h"
+
+/* Try to schedule only once per fragment */
+
+void emu10k1_timer_irqhandler(struct emu10k1_card *card)
+{
+	struct emu_timer *t;
+	struct list_head *entry;
+
+	spin_lock(&card->timer_lock);
+
+	list_for_each(entry, &card->timers) {
+		t = list_entry(entry, struct emu_timer, list);
+
+		if (t->active) {
+			t->count++;
+			if (t->count == t->count_max) {
+				t->count = 0;
+				tasklet_hi_schedule(&t->tasklet);
+			}
+		}
+	}
+
+	spin_unlock(&card->timer_lock);
+
+	return;
+}
+
+struct emu_timer *emu10k1_timer_install(struct emu10k1_card *card, void (*func) (unsigned long), unsigned long data, u32 delay)
+{
+	struct emu_timer *timer;
+	struct emu_timer *t;
+	struct list_head *entry;
+	unsigned long flags;
+
+	if ((timer = (struct emu_timer *) kmalloc(sizeof(struct emu_timer), GFP_KERNEL)) == NULL)
+		return timer;
+
+	if (delay < 5)
+		delay = 5;
+
+	timer->delay = delay;
+	tasklet_init(&timer->tasklet, func, data);
+	timer->active = 0;
+
+	spin_lock_irqsave(&card->timer_lock, flags);
+
+	timer->count_max = timer->delay / (card->timer_delay < 1024 ? card->timer_delay : 1024);
+	timer->count = timer->count_max - 1;
+
+	list_add(&timer->list, &card->timers);
+
+	if (card->timer_delay > delay) {
+		if (card->timer_delay == TIMER_STOPPED)
+			emu10k1_irq_enable(card, INTE_INTERVALTIMERENB);
+
+		card->timer_delay = delay;
+		delay = (delay < 1024 ? delay : 1024);
+
+		WRITE_FN0(card, TIMER_RATE, delay);
+
+		list_for_each(entry, &card->timers) {
+			t = list_entry(entry, struct emu_timer, list);
+
+			t->count_max = t->delay / delay;
+			/* don't want to think much, just force scheduling 
+			   on the next interrupt */
+			t->count = t->count_max - 1;
+		}
+
+		DPD(2, "timer rate --> %u\n", delay);
+	}
+
+	spin_unlock_irqrestore(&card->timer_lock, flags);
+
+	return timer;
+}
+
+void emu10k1_timer_uninstall(struct emu10k1_card *card, struct emu_timer *timer)
+{
+	struct emu_timer *t;
+	struct list_head *entry;
+	u32 delay = TIMER_STOPPED;
+	unsigned long flags;
+
+	spin_lock_irqsave(&card->timer_lock, flags);
+
+	list_del(&timer->list);
+
+	list_for_each(entry, &card->timers) {
+		t = list_entry(entry, struct emu_timer, list);
+
+		if (t->delay < delay)
+			delay = t->delay;
+	}
+
+	if (card->timer_delay != delay) {
+		card->timer_delay = delay;
+
+		if (delay == TIMER_STOPPED)
+			emu10k1_irq_disable(card, INTE_INTERVALTIMERENB);
+		else {
+			delay = (delay < 1024 ? delay : 1024);
+
+			WRITE_FN0(card, TIMER_RATE, delay);
+
+			list_for_each(entry, &card->timers) {
+				t = list_entry(entry, struct emu_timer, list);
+
+				t->count_max = t->delay / delay;
+				t->count = t->count_max - 1;
+			}
+		}
+
+		DPD(2, "timer rate --> %u\n", delay);
+	}
+
+	spin_unlock_irqrestore(&card->timer_lock, flags);
+
+	tasklet_unlock_wait(&timer->tasklet);
+	kfree(timer);
+
+	return;
+}
+
+void emu10k1_timer_enable(struct emu10k1_card *card, struct emu_timer *timer)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&card->timer_lock, flags);
+	timer->active = 1;
+	spin_unlock_irqrestore(&card->timer_lock, flags);
+
+	return;
+}
+
+void emu10k1_timer_disable(struct emu10k1_card *card, struct emu_timer *timer)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&card->timer_lock, flags);
+	timer->active = 0;
+	spin_unlock_irqrestore(&card->timer_lock, flags);
+
+	return;
+}