[ALSA] soc - Add device level DAPM event

Added a device level dapm event so that both the machine and codec are informed
when dapm events occur.

Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/include/sound/soc.h b/include/sound/soc.h
index c22c656..add5f94 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -425,6 +425,9 @@
 	int (*resume_pre)(struct platform_device *pdev);
 	int (*resume_post)(struct platform_device *pdev);
 
+	/* callbacks */
+	int (*dapm_event)(struct snd_soc_machine *, int event);
+
 	/* CPU <--> Codec DAI links  */
 	struct snd_soc_dai_link *dai_link;
 	int num_links;