+static void snd_hda_do_register(struct work_struct *work)
+{
+ struct hda_beep *beep =
+ container_of(work, struct hda_beep, register_work);
+
+ mutex_lock(&beep->mutex);
+ if (beep->enabled && !beep->dev)
+ snd_hda_do_attach(beep);
+ mutex_unlock(&beep->mutex);
+}
+
+static void snd_hda_do_unregister(struct work_struct *work)
+{
+ struct hda_beep *beep =
+ container_of(work, struct hda_beep, unregister_work.work);
+
+ mutex_lock(&beep->mutex);
+ if (!beep->enabled && beep->dev)
+ snd_hda_do_detach(beep);
+ mutex_unlock(&beep->mutex);
+}
+
+int snd_hda_enable_beep_device(struct hda_codec *codec, int enable)
+{
+ struct hda_beep *beep = codec->beep;
+ enable = !!enable;
+ if (beep == NULL)
+ return 0;
+ if (beep->enabled != enable) {
+ beep->enabled = enable;
+ if (!enable) {
+ /* turn off beep */
+ snd_hda_codec_write(beep->codec, beep->nid, 0,
+ AC_VERB_SET_BEEP_CONTROL, 0);
+ }
+ if (beep->mode == HDA_BEEP_MODE_SWREG) {
+ if (enable) {
+ cancel_delayed_work(&beep->unregister_work);
+ schedule_work(&beep->register_work);
+ } else {
+ schedule_delayed_work(&beep->unregister_work,
+ HZ);
+ }
+ }
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_HDA(snd_hda_enable_beep_device);
+
+int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
+{
+ struct hda_beep *beep;
+
+ if (!snd_hda_get_bool_hint(codec, "beep"))
+ return 0; /* disabled explicitly by hints */
+ if (codec->beep_mode == HDA_BEEP_MODE_OFF)
+ return 0; /* disabled by module option */
+
+ beep = kzalloc(sizeof(*beep), GFP_KERNEL);
+ if (beep == NULL)
+ return -ENOMEM;
+ snprintf(beep->phys, sizeof(beep->phys),
+ "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);