sound/pci/azt3328.c

70  *  - built-in General DirectX timer having a 20 bits counter
88  *  since it additionally supports the card's 1MHz DirectX timer - just try
111  *  at least sometimes.   Maybe even use with hardware sequencer timer above :)
153  *  - (ab)use 1MHz DirectX timer as kernel clocksource
240 MODULE_PARM_DESC(seqtimer_scaling, "Set 1024000Hz sequencer timer scale factor (lockup danger!). Default 128.");
270 	struct snd_timer *timer;
1736 	/* ok, this one is a bit dirty: cooked_read is being polled by a timer,
1908 		/* dev_dbg(chip->card->dev, "timer %ld\n",
1912 		if (chip->timer)
1913 			snd_timer_interrupt(chip->timer, chip->timer->sticks);
1914 		/* ACK timer */
1918 		dev_dbg(chip->card->dev, "timer IRQ\n");
1928 	 * than timer and playback/recording, right? */
2126 /*** NOTE: the physical timer resolution actually is 1024000 ticks per second
2129  *** configure the timer to a 1 tick value, resulting in an absolutely fatal
2130  *** timer IRQ storm.
2131  *** Thus I chose to announce a down-scaled virtual timer to the outside and
2132  *** calculate real timer countdown values internally.
2137 snd_azf3328_timer_start(struct snd_timer *timer)
2143 	chip = snd_timer_chip(timer);
2144 	delay = ((timer->sticks * seqtimer_scaling) - 1) & TIMER_VALUE_MASK;
2153 	dev_dbg(chip->card->dev, "setting timer countdown value %d\n", delay);
2162 snd_azf3328_timer_stop(struct snd_timer *timer)
2167 	chip = snd_timer_chip(timer);
2169 	/* disable timer countdown and interrupt */
2171 	   YES indeed, otherwise a rogue timer operation - which prompts
2183 snd_azf3328_timer_precise_resolution(struct snd_timer *timer,
2203 	struct snd_timer *timer = NULL;
2216 	err = snd_timer_new(chip->card, "AZF3328", &tid, &timer);
2220 	strcpy(timer->name, "AZF3328 timer");
2221 	timer->private_data = chip;
2222 	timer->hw = snd_azf3328_timer_hw;
2224 	chip->timer = timer;
2226 	snd_azf3328_timer_stop(timer);
2243 	snd_azf3328_timer_stop(chip->timer);
2501 		 "User-scalable sequencer timer set to %dHz (1024000Hz / %d).\n",