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ALSA: lola - Allow granularity changes 

Add some sanity checks.
Change PCM parameters appropriately per granularity.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2011-05-03 16:51:56 +02:00
parent 972505ccde
commit 8bd172dc96
3 changed files with 27 additions and 7 deletions
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27
sound/pci/lola/lola.c
View File

@ -587,14 +587,31 @@ static int __devinit lola_create(struct snd_card *card, struct pci_dev *pci,
chip->pci = pci;
chip->irq = -1;
chip->sample_rate_min = sample_rate_min[dev];
chip->granularity = granularity[dev];
/* FIXME */
if (chip->granularity != LOLA_GRANULARITY_MAX) {
switch (chip->granularity) {
case 8:
chip->sample_rate_max = 48000;
break;
case 16:
chip->sample_rate_max = 96000;
break;
case 32:
chip->sample_rate_max = 192000;
break;
default:
snd_printk(KERN_WARNING SFX
"Only %d granularity is supported for now\n",
LOLA_GRANULARITY_MAX);
"Invalid granularity %d, reset to %d\n",
chip->granularity, LOLA_GRANULARITY_MAX);
chip->granularity = LOLA_GRANULARITY_MAX;
chip->sample_rate_max = 192000;
break;
}
chip->sample_rate_min = sample_rate_min[dev];
if (chip->sample_rate_min > chip->sample_rate_max) {
snd_printk(KERN_WARNING SFX
"Invalid sample_rate_min %d, reset to 16000\n",
chip->sample_rate_min);
chip->sample_rate_min = 16000;
}
err = pci_request_regions(pci, DRVNAME);

1
sound/pci/lola/lola.h
View File

@ -367,6 +367,7 @@ struct lola {
/* parameters */
unsigned int granularity;
unsigned int sample_rate_min;
unsigned int sample_rate_max;
/* flags */
unsigned int running :1;

6
sound/pci/lola/lola_pcm.c
View File

@ -178,14 +178,16 @@ static int lola_pcm_open(struct snd_pcm_substream *substream)
str->opened = 1;
runtime->hw = lola_pcm_hw;
runtime->hw.channels_max = pcm->num_streams - str->index;
runtime->hw.rate_min = chip->sample_rate_min;
runtime->hw.rate_max = chip->sample_rate_max;
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
/* period size = multiple of chip->granularity (8, 16 or 32 frames)
* use LOLA_GRANULARITY_MAX = 32 for instance
*/
snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
LOLA_GRANULARITY_MAX);
chip->granularity);
snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
LOLA_GRANULARITY_MAX);
chip->granularity);
mutex_unlock(&chip->open_mutex);
return 0;
}