ALSA: info: Add standard helpers for card proc file entries

[linux-2.6-microblaze.git] / sound / core / info.c

diff --git a/sound/core/info.c b/sound/core/info.c
index 5cd0062..6c149fa 100644 (file)
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -866,6 +866,38 @@ int snd_info_register(struct snd_info_entry *entry)
 }
 EXPORT_SYMBOL(snd_info_register);
 
+/**
+ * snd_card_rw_proc_new - Create a read/write text proc file entry for the card
+ * @card: the card instance
+ * @name: the file name
+ * @private_data: the arbitrary private data
+ * @read: the read callback
+ * @write: the write callback, NULL for read-only
+ *
+ * This proc file entry will be registered via snd_card_register() call, and
+ * it will be removed automatically at the card removal, too.
+ */
+int snd_card_rw_proc_new(struct snd_card *card, const char *name,
+                        void *private_data,
+                        void (*read)(struct snd_info_entry *,
+                                     struct snd_info_buffer *),
+                        void (*write)(struct snd_info_entry *entry,
+                                      struct snd_info_buffer *buffer))
+{
+       struct snd_info_entry *entry;
+
+       entry = snd_info_create_card_entry(card, name, card->proc_root);
+       if (!entry)
+               return -ENOMEM;
+       snd_info_set_text_ops(entry, private_data, read);
+       if (write) {
+               entry->mode |= 0200;
+               entry->c.text.write = write;
+       }
+       return 0;
+}
+EXPORT_SYMBOL_GPL(snd_card_rw_proc_new);
+
 /*
 
  */