ASoC: wm_adsp: Add support for opening a compressed stream

Allow user-space to open a compressed stream, although no data will be
passed yet, as part of this adding the ability to define supported
capabilities per firmware and check these match the stream being opened.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm_adsp.h

@@ -15,6 +15,7 @@
 
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
+#include <sound/compress_driver.h>
 
 #include "wmfw.h"
 
@@ -30,6 +31,8 @@ struct wm_adsp_alg_region {
 	unsigned int base;
 };
 
+struct wm_adsp_compr;
+
 struct wm_adsp {
 	const char *part;
 	int num;
@@ -59,6 +62,8 @@ struct wm_adsp {
 
 	struct work_struct boot_work;
 
+	struct wm_adsp_compr *compr;
+
 	struct mutex pwr_lock;
 
 #ifdef CONFIG_DEBUG_FS
@@ -97,4 +102,12 @@ int wm_adsp2_early_event(struct snd_soc_dapm_widget *w,
 int wm_adsp2_event(struct snd_soc_dapm_widget *w,
 		   struct snd_kcontrol *kcontrol, int event);
 
+extern int wm_adsp_compr_open(struct wm_adsp *dsp,
+			      struct snd_compr_stream *stream);
+extern int wm_adsp_compr_free(struct snd_compr_stream *stream);
+extern int wm_adsp_compr_set_params(struct snd_compr_stream *stream,
+				    struct snd_compr_params *params);
+extern int wm_adsp_compr_get_caps(struct snd_compr_stream *stream,
+				  struct snd_compr_caps *caps);
+
 #endif