[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>

1 files changed, 24 insertions, 0 deletions

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index ed3b09469560..bf8f412988b8 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);
         }