gus_timer.c

Go to the documentation of this file.

/*
 *  Routines for Gravis UltraSound soundcards - Timers
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *
 *  GUS have similar timers as AdLib (OPL2/OPL3 chips).
 *
 *
 *   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/gus.h>

/*
 *  Timer 1 - 80us
 */

static int snd_gf1_timer1_start(struct snd_timer * timer)
{
    unsigned long flags;
    unsigned char tmp;
    unsigned int ticks;
    struct snd_gus_card *gus;

    gus = snd_timer_chip(timer);
    spin_lock_irqsave(&gus->reg_lock, flags);
    ticks = timer->sticks;
    tmp = (gus->gf1.timer_enabled |= 4);
    snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_1, 256 - ticks);   /* timer 1 count */
    snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* enable timer 1 IRQ */
    snd_gf1_adlib_write(gus, 0x04, tmp >> 2);   /* timer 2 start */
    spin_unlock_irqrestore(&gus->reg_lock, flags);
    return 0;
}

static int snd_gf1_timer1_stop(struct snd_timer * timer)
{
    unsigned long flags;
    unsigned char tmp;
    struct snd_gus_card *gus;

    gus = snd_timer_chip(timer);
    spin_lock_irqsave(&gus->reg_lock, flags);
    tmp = (gus->gf1.timer_enabled &= ~4);
    snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* disable timer #1 */
    spin_unlock_irqrestore(&gus->reg_lock, flags);
    return 0;
}

/*
 *  Timer 2 - 320us
 */

static int snd_gf1_timer2_start(struct snd_timer * timer)
{
    unsigned long flags;
    unsigned char tmp;
    unsigned int ticks;
    struct snd_gus_card *gus;

    gus = snd_timer_chip(timer);
    spin_lock_irqsave(&gus->reg_lock, flags);
    ticks = timer->sticks;
    tmp = (gus->gf1.timer_enabled |= 8);
    snd_gf1_write8(gus, SNDRV_GF1_GB_ADLIB_TIMER_2, 256 - ticks);   /* timer 2 count */
    snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* enable timer 2 IRQ */
    snd_gf1_adlib_write(gus, 0x04, tmp >> 2);   /* timer 2 start */
    spin_unlock_irqrestore(&gus->reg_lock, flags);
    return 0;
}

static int snd_gf1_timer2_stop(struct snd_timer * timer)
{
    unsigned long flags;
    unsigned char tmp;
    struct snd_gus_card *gus;

    gus = snd_timer_chip(timer);
    spin_lock_irqsave(&gus->reg_lock, flags);
    tmp = (gus->gf1.timer_enabled &= ~8);
    snd_gf1_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, tmp);   /* disable timer #1 */
    spin_unlock_irqrestore(&gus->reg_lock, flags);
    return 0;
}

/*

 */

static void snd_gf1_interrupt_timer1(struct snd_gus_card * gus)
{
    struct snd_timer *timer = gus->gf1.timer1;

    if (timer == NULL)
        return;
    snd_timer_interrupt(timer, timer->sticks);
}

static void snd_gf1_interrupt_timer2(struct snd_gus_card * gus)
{
    struct snd_timer *timer = gus->gf1.timer2;

    if (timer == NULL)
        return;
    snd_timer_interrupt(timer, timer->sticks);
}

/*

 */

static struct snd_timer_hardware snd_gf1_timer1 =
{
    .flags =    SNDRV_TIMER_HW_STOP,
    .resolution =   80000,
    .ticks =    256,
    .start =    snd_gf1_timer1_start,
    .stop =     snd_gf1_timer1_stop,
};

static struct snd_timer_hardware snd_gf1_timer2 =
{
    .flags =    SNDRV_TIMER_HW_STOP,
    .resolution =   320000,
    .ticks =    256,
    .start =    snd_gf1_timer2_start,
    .stop =     snd_gf1_timer2_stop,
};

static void snd_gf1_timer1_free(struct snd_timer *timer)
{
    struct snd_gus_card *gus = timer->private_data;
    gus->gf1.timer1 = NULL;
}

static void snd_gf1_timer2_free(struct snd_timer *timer)
{
    struct snd_gus_card *gus = timer->private_data;
    gus->gf1.timer2 = NULL;
}

void snd_gf1_timers_init(struct snd_gus_card * gus)
{
    struct snd_timer *timer;
    struct snd_timer_id tid;

    if (gus->gf1.timer1 != NULL || gus->gf1.timer2 != NULL)
        return;

    gus->gf1.interrupt_handler_timer1 = snd_gf1_interrupt_timer1;
    gus->gf1.interrupt_handler_timer2 = snd_gf1_interrupt_timer2;

    tid.dev_class = SNDRV_TIMER_CLASS_CARD;
    tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
    tid.card = gus->card->number;
    tid.device = gus->timer_dev;
    tid.subdevice = 0;

    if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
        strcpy(timer->name, "GF1 timer #1");
        timer->private_data = gus;
        timer->private_free = snd_gf1_timer1_free;
        timer->hw = snd_gf1_timer1;
    }
    gus->gf1.timer1 = timer;

    tid.device++;

    if (snd_timer_new(gus->card, "GF1 timer", &tid, &timer) >= 0) {
        strcpy(timer->name, "GF1 timer #2");
        timer->private_data = gus;
        timer->private_free = snd_gf1_timer2_free;
        timer->hw = snd_gf1_timer2;
    }
    gus->gf1.timer2 = timer;
}

void snd_gf1_timers_done(struct snd_gus_card * gus)
{
    snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_TIMER1 | SNDRV_GF1_HANDLER_TIMER2);
    if (gus->gf1.timer1) {
        snd_device_free(gus->card, gus->gf1.timer1);
        gus->gf1.timer1 = NULL;
    }
    if (gus->gf1.timer2) {
        snd_device_free(gus->card, gus->gf1.timer2);
        gus->gf1.timer2 = NULL;
    }
}