| 1 | /*
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| 2 | * Copyright (c) by Lee Revell <rlrevell@joe-job.com>
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| 3 | *
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| 4 | * Routines for control of EMU10K1 chips
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| 5 | *
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| 6 | * Copied from similar code by Clemens Ladisch in the ymfpci driver
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| 7 | *
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| 8 | * BUGS:
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| 9 | * --
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| 10 | *
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| 11 | * TODO:
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| 12 | * --
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| 13 | *
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| 14 | * This program is free software; you can redistribute it and/or modify
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| 15 | * it under the terms of the GNU General Public License as published by
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| 16 | * the Free Software Foundation; either version 2 of the License, or
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| 17 | * (at your option) any later version.
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| 18 | *
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| 19 | * This program is distributed in the hope that it will be useful,
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| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 22 | * GNU General Public License for more details.
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| 23 | *
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| 24 | * You should have received a copy of the GNU General Public License
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| 25 | * along with this program; if not, write to the Free Software
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| 26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 27 | *
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| 28 | */
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| 29 |
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| 30 | #include <sound/driver.h>
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| 31 | #include <linux/time.h>
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| 32 | #include <sound/core.h>
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| 33 | #include <sound/emu10k1.h>
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| 34 |
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| 35 | static int snd_emu10k1_timer_start(snd_timer_t *timer)
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| 36 | {
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| 37 | emu10k1_t *emu;
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| 38 | unsigned long flags;
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| 39 | unsigned int delay;
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| 40 |
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| 41 | emu = snd_timer_chip(timer);
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| 42 | delay = timer->sticks - 1;
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| 43 | if (delay < 5 ) /* minimum time is 5 ticks */
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| 44 | delay = 5;
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| 45 | spin_lock_irqsave(&emu->reg_lock, flags);
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| 46 | snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB);
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| 47 | outw(delay & TIMER_RATE_MASK, emu->port + TIMER);
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| 48 | spin_unlock_irqrestore(&emu->reg_lock, flags);
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| 49 | return 0;
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| 50 | }
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| 51 |
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| 52 | static int snd_emu10k1_timer_stop(snd_timer_t *timer)
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| 53 | {
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| 54 | emu10k1_t *emu;
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| 55 | unsigned long flags;
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| 56 |
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| 57 | emu = snd_timer_chip(timer);
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| 58 | spin_lock_irqsave(&emu->reg_lock, flags);
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| 59 | snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB);
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| 60 | spin_unlock_irqrestore(&emu->reg_lock, flags);
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| 61 | return 0;
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| 62 | }
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| 63 |
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| 64 | static int snd_emu10k1_timer_precise_resolution(snd_timer_t *timer,
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| 65 | unsigned long *num, unsigned long *den)
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| 66 | {
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| 67 | *num = 1;
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| 68 | *den = 48000;
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| 69 | return 0;
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| 70 | }
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| 71 |
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| 72 | static struct _snd_timer_hardware snd_emu10k1_timer_hw = {
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| 73 | /*.flags = */SNDRV_TIMER_HW_AUTO,
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| 74 | /*.resolution = */20833, /* 1 sample @ 48KHZ = 20.833...us */
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| 75 | 0, 0,
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| 76 | /*.ticks = */1024,
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| 77 | NULL, NULL, NULL,
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| 78 | /*.start = */snd_emu10k1_timer_start,
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| 79 | /*.stop = */snd_emu10k1_timer_stop,
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| 80 | NULL,
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| 81 | /*.precise_resolution = */snd_emu10k1_timer_precise_resolution
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| 82 | };
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| 83 |
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| 84 | int __devinit snd_emu10k1_timer(emu10k1_t *emu, int device)
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| 85 | {
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| 86 | snd_timer_t *timer = NULL;
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| 87 | snd_timer_id_t tid;
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| 88 | int err;
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| 89 |
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| 90 | tid.dev_class = SNDRV_TIMER_CLASS_CARD;
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| 91 | tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
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| 92 | tid.card = emu->card->number;
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| 93 | tid.device = device;
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| 94 | tid.subdevice = 0;
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| 95 | if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) {
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| 96 | strcpy(timer->name, "EMU10K1 timer");
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| 97 | timer->private_data = emu;
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| 98 | timer->hw = snd_emu10k1_timer_hw;
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| 99 | }
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| 100 | emu->timer = timer;
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| 101 | return err;
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| 102 | }
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