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authorTakashi Iwai <tiwai@suse.de>2006-09-06 14:27:46 +0200
committerJaroslav Kysela <perex@suse.cz>2006-09-23 10:46:32 +0200
commit9d19f48cfe2570562c2c6226780a7ca627b0f1f1 (patch)
treedffe11da7daa0b27225c08badee58628923d961b /sound/core/pcm.c
parenta7da6ce564a80952d9c0b210deca5a8cd3474a31 (diff)
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[ALSA] Add pcm_class attribute to PCM sysfs entry
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>
Diffstat (limited to 'sound/core/pcm.c')
-rw-r--r--sound/core/pcm.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index ed3b094..bf8f412 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -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);
}