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1a59d1b8e0
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Lee Revell <rlrevell@joe-job.com>
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* Clemens Ladisch <clemens@ladisch.de>
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* Routines for control of EMU10K1 chips
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*
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* BUGS:
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* --
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*
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* TODO:
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* --
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*/
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#include <linux/time.h>
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#include <sound/core.h>
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#include <sound/emu10k1.h>
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static int snd_emu10k1_timer_start(struct snd_timer *timer)
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{
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struct snd_emu10k1 *emu;
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unsigned long flags;
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unsigned int delay;
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emu = snd_timer_chip(timer);
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delay = timer->sticks - 1;
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if (delay < 5 ) /* minimum time is 5 ticks */
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delay = 5;
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spin_lock_irqsave(&emu->reg_lock, flags);
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snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
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outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
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spin_unlock_irqrestore(&emu->reg_lock, flags);
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return 0;
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}
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static int snd_emu10k1_timer_stop(struct snd_timer *timer)
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{
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struct snd_emu10k1 *emu;
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unsigned long flags;
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emu = snd_timer_chip(timer);
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spin_lock_irqsave(&emu->reg_lock, flags);
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snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
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spin_unlock_irqrestore(&emu->reg_lock, flags);
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return 0;
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}
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static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer,
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unsigned long *num, unsigned long *den)
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{
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*num = 1;
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*den = 48000;
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return 0;
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}
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static struct snd_timer_hardware snd_emu10k1_timer_hw = {
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.flags = SNDRV_TIMER_HW_AUTO,
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.resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */
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.ticks = 1024,
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.start = snd_emu10k1_timer_start,
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.stop = snd_emu10k1_timer_stop,
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.precise_resolution = snd_emu10k1_timer_precise_resolution,
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};
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int snd_emu10k1_timer(struct snd_emu10k1 *emu, int device)
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{
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struct snd_timer *timer = NULL;
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struct snd_timer_id tid;
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int err;
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tid.dev_class = SNDRV_TIMER_CLASS_CARD;
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tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
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tid.card = emu->card->number;
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tid.device = device;
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tid.subdevice = 0;
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if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) {
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strcpy(timer->name, "EMU10K1 timer");
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timer->private_data = emu;
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timer->hw = snd_emu10k1_timer_hw;
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}
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emu->timer = timer;
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return err;
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}
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