summaryrefslogtreecommitdiffstats
path: root/sound/pci/emu10k1/timer.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/pci/emu10k1/timer.c')
-rw-r--r--sound/pci/emu10k1/timer.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/timer.c b/sound/pci/emu10k1/timer.c
new file mode 100644
index 000000000..2435d3ba6
--- /dev/null
+++ b/sound/pci/emu10k1/timer.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) by Lee Revell <rlrevell@joe-job.com>
+ * Clemens Ladisch <clemens@ladisch.de>
+ * Routines for control of EMU10K1 chips
+ *
+ * BUGS:
+ * --
+ *
+ * TODO:
+ * --
+ */
+
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/emu10k1.h>
+
+static int snd_emu10k1_timer_start(struct snd_timer *timer)
+{
+ struct snd_emu10k1 *emu;
+ unsigned long flags;
+ unsigned int delay;
+
+ emu = snd_timer_chip(timer);
+ delay = timer->sticks - 1;
+ if (delay < 5 ) /* minimum time is 5 ticks */
+ delay = 5;
+ spin_lock_irqsave(&emu->reg_lock, flags);
+ snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
+ outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
+ spin_unlock_irqrestore(&emu->reg_lock, flags);
+ return 0;
+}
+
+static int snd_emu10k1_timer_stop(struct snd_timer *timer)
+{
+ struct snd_emu10k1 *emu;
+ unsigned long flags;
+
+ emu = snd_timer_chip(timer);
+ spin_lock_irqsave(&emu->reg_lock, flags);
+ snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
+ spin_unlock_irqrestore(&emu->reg_lock, flags);
+ return 0;
+}
+
+static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer,
+ unsigned long *num, unsigned long *den)
+{
+ *num = 1;
+ *den = 48000;
+ return 0;
+}
+
+static const struct snd_timer_hardware snd_emu10k1_timer_hw = {
+ .flags = SNDRV_TIMER_HW_AUTO,
+ .resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */
+ .ticks = 1024,
+ .start = snd_emu10k1_timer_start,
+ .stop = snd_emu10k1_timer_stop,
+ .precise_resolution = snd_emu10k1_timer_precise_resolution,
+};
+
+int snd_emu10k1_timer(struct snd_emu10k1 *emu, int device)
+{
+ struct snd_timer *timer = NULL;
+ struct snd_timer_id tid;
+ int err;
+
+ tid.dev_class = SNDRV_TIMER_CLASS_CARD;
+ tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
+ tid.card = emu->card->number;
+ tid.device = device;
+ tid.subdevice = 0;
+ err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer);
+ if (err >= 0) {
+ strcpy(timer->name, "EMU10K1 timer");
+ timer->private_data = emu;
+ timer->hw = snd_emu10k1_timer_hw;
+ }
+ emu->timer = timer;
+ return err;
+}