Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / pci / emu10k1 / timer.c

diff --git a/kernel/sound/pci/emu10k1/timer.c b/kernel/sound/pci/emu10k1/timer.c
new file mode 100644 (file)
index 0000000..b69a7f8
--- /dev/null
+++ b/kernel/sound/pci/emu10k1/timer.c
@@ -0,0 +1,96 @@
+/*
+ *  Copyright (c) by Lee Revell <rlrevell@joe-job.com>
+ *                   Clemens Ladisch <clemens@ladisch.de>
+ *  Routines for control of EMU10K1 chips
+ *
+ *  BUGS:
+ *    --
+ *
+ *  TODO:
+ *    --
+ *
+ *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#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 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;
+       if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) {
+               strcpy(timer->name, "EMU10K1 timer");
+               timer->private_data = emu;
+               timer->hw = snd_emu10k1_timer_hw;
+       }
+       emu->timer = timer;
+       return err;
+}