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[ALSA] Add pcm_class attribute to PCM sysfs entry

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This patch adds a new attribute, pcm_class, to each PCM sysfs entry.
It's useful to detect what kind of PCM stream is, for example, HAL
can check whether it's a modem or not.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai
2006-09-06 14:27:46 +02:00
committed by Jaroslav Kysela
parent a7da6ce564
commit 9d19f48cfe
3 changed files with 72 additions and 12 deletions
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24
sound/core/pcm.c
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@@ -907,6 +907,28 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
substream->pstr->substream_opened--;
}
static ssize_t show_pcm_class(struct class_device *class_device, char *buf)
{
struct snd_pcm *pcm;
const char *str;
static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
[SNDRV_PCM_CLASS_GENERIC] = "generic",
[SNDRV_PCM_CLASS_MULTI] = "multi",
[SNDRV_PCM_CLASS_MODEM] = "modem",
[SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
};
if (! (pcm = class_get_devdata(class_device)) ||
pcm->dev_class > SNDRV_PCM_CLASS_LAST)
str = "none";
else
str = strs[pcm->dev_class];
return snprintf(buf, PAGE_SIZE, "%s\n", str);
}
static struct class_device_attribute pcm_attrs =
__ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
static int snd_pcm_dev_register(struct snd_device *device)
{
int cidx, err;
@@ -945,6 +967,8 @@ static int snd_pcm_dev_register(struct snd_device *device)
mutex_unlock(&register_mutex);
return err;
}
snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
&pcm_attrs);
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
snd_pcm_timer_init(substream);
}