[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, 4 insertions, 0 deletions

diff --git a/include/sound/core.h b/include/sound/core.h
index 1359c532b68e..b056ea925ecf 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -26,6 +26,7 @@
 #include <linux/mutex.h>                /* struct mutex */
 #include <linux/rwsem.h>                /* struct rw_semaphore */
 #include <linux/pm.h>                   /* pm_message_t */
+#include <linux/device.h>
 
 /* forward declarations */
 #ifdef CONFIG_PCI
@@ -186,6 +187,7 @@ struct snd_minor {
         int device;                     /* device number */
         const struct file_operations *f_ops;    /* file operations */
         void *private_data;             /* private data for f_ops->open */
+        struct class_device *class_dev; /* class device for sysfs */
 };
 
 /* sound.c */
@@ -200,6 +202,8 @@ int snd_register_device(int type, struct snd_card *card, int dev,
                         const char *name);
 int snd_unregister_device(int type, struct snd_card *card, int dev);
 void *snd_lookup_minor_data(unsigned int minor, int type);
+int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
+                              const struct class_device_attribute *attr);
 
 #ifdef CONFIG_SND_OSSEMUL
 int snd_register_oss_device(int type, struct snd_card *card, int dev,