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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /sound/pci/emu10k1/timer.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/pci/emu10k1/timer.c')
-rw-r--r--sound/pci/emu10k1/timer.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/timer.c b/sound/pci/emu10k1/timer.c
new file mode 100644
index 0000000000..bb24783193
--- /dev/null
+++ b/sound/pci/emu10k1/timer.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) by Lee Revell <rlrevell@joe-job.com>
+ * Clemens Ladisch <clemens@ladisch.de>
+ * Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
+ *
+ * Routines for control of EMU10K1 chips
+ */
+
+#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 int delay;
+
+ emu = snd_timer_chip(timer);
+ delay = timer->sticks - 1;
+ if (delay < 5 ) /* minimum time is 5 ticks */
+ delay = 5;
+ snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
+ outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
+ return 0;
+}
+
+static int snd_emu10k1_timer_stop(struct snd_timer *timer)
+{
+ struct snd_emu10k1 *emu;
+
+ emu = snd_timer_chip(timer);
+ snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
+ return 0;
+}
+
+static unsigned long snd_emu10k1_timer_c_resolution(struct snd_timer *timer)
+{
+ struct snd_emu10k1 *emu = snd_timer_chip(timer);
+
+ if (emu->card_capabilities->emu_model &&
+ emu->emu1010.word_clock == 44100)
+ return 22676; // 1 sample @ 44.1 kHz = 22.675736...us
+ else
+ return 20833; // 1 sample @ 48 kHz = 20.833...us
+}
+
+static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer,
+ unsigned long *num, unsigned long *den)
+{
+ struct snd_emu10k1 *emu = snd_timer_chip(timer);
+
+ *num = 1;
+ if (emu->card_capabilities->emu_model)
+ *den = emu->emu1010.word_clock;
+ else
+ *den = 48000;
+ return 0;
+}
+
+static const struct snd_timer_hardware snd_emu10k1_timer_hw = {
+ .flags = SNDRV_TIMER_HW_AUTO,
+ .ticks = 1024,
+ .start = snd_emu10k1_timer_start,
+ .stop = snd_emu10k1_timer_stop,
+ .c_resolution = snd_emu10k1_timer_c_resolution,
+ .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;
+}