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Linux/sound/pci/emu10k1/timer.c

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  1 /*
  2  *  Copyright (c) by Lee Revell <rlrevell@joe-job.com>
  3  *                   Clemens Ladisch <clemens@ladisch.de>
  4  *  Routines for control of EMU10K1 chips
  5  *
  6  *  BUGS:
  7  *    --
  8  *
  9  *  TODO:
 10  *    --
 11  *
 12  *   This program is free software; you can redistribute it and/or modify
 13  *   it under the terms of the GNU General Public License as published by
 14  *   the Free Software Foundation; either version 2 of the License, or
 15  *   (at your option) any later version.
 16  *
 17  *   This program is distributed in the hope that it will be useful,
 18  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 19  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 20  *   GNU General Public License for more details.
 21  *
 22  *   You should have received a copy of the GNU General Public License
 23  *   along with this program; if not, write to the Free Software
 24  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 25  *
 26  */
 27 
 28 #include <linux/time.h>
 29 #include <sound/core.h>
 30 #include <sound/emu10k1.h>
 31 
 32 static int snd_emu10k1_timer_start(struct snd_timer *timer)
 33 {
 34         struct snd_emu10k1 *emu;
 35         unsigned long flags;
 36         unsigned int delay;
 37 
 38         emu = snd_timer_chip(timer);
 39         delay = timer->sticks - 1;
 40         if (delay < 5 ) /* minimum time is 5 ticks */
 41                 delay = 5;
 42         spin_lock_irqsave(&emu->reg_lock, flags);
 43         snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
 44         outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
 45         spin_unlock_irqrestore(&emu->reg_lock, flags);
 46         return 0;
 47 }
 48 
 49 static int snd_emu10k1_timer_stop(struct snd_timer *timer)
 50 {
 51         struct snd_emu10k1 *emu;
 52         unsigned long flags;
 53 
 54         emu = snd_timer_chip(timer);
 55         spin_lock_irqsave(&emu->reg_lock, flags);
 56         snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
 57         spin_unlock_irqrestore(&emu->reg_lock, flags);
 58         return 0;
 59 }
 60 
 61 static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer,
 62                                                unsigned long *num, unsigned long *den)
 63 {
 64         *num = 1;
 65         *den = 48000;
 66         return 0;
 67 }
 68 
 69 static struct snd_timer_hardware snd_emu10k1_timer_hw = {
 70         .flags = SNDRV_TIMER_HW_AUTO,
 71         .resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */
 72         .ticks = 1024,
 73         .start = snd_emu10k1_timer_start,
 74         .stop = snd_emu10k1_timer_stop,
 75         .precise_resolution = snd_emu10k1_timer_precise_resolution,
 76 };
 77 
 78 int snd_emu10k1_timer(struct snd_emu10k1 *emu, int device)
 79 {
 80         struct snd_timer *timer = NULL;
 81         struct snd_timer_id tid;
 82         int err;
 83 
 84         tid.dev_class = SNDRV_TIMER_CLASS_CARD;
 85         tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 86         tid.card = emu->card->number;
 87         tid.device = device;
 88         tid.subdevice = 0;
 89         if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) {
 90                 strcpy(timer->name, "EMU10K1 timer");
 91                 timer->private_data = emu;
 92                 timer->hw = snd_emu10k1_timer_hw;
 93         }
 94         emu->timer = timer;
 95         return err;
 96 }
 97 

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