ASoC: Add MBHC and IRQ driver for WCD937X

Add MBHC and IRQ driver for tanggu codec.
MBHC and IRQ for tanggu are initialized from
core driver. IRQ driver uses REGMAP-IRQ
framework.

CRs-Fixed: 2281591
Change-Id: I06adb3081dd17f896b3e6a3ce0c4c46b5ef1cbea
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>

asoc/codecs/wcd937x/wcd937x-mbhc.h

@@ -0,0 +1,70 @@
+/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#ifndef __WCD937X_MBHC_H__
+#define __WCD937X_MBHC_H__
+#include "../wcd-mbhc-v2.h"
+
+struct wcd937x_mbhc {
+	struct wcd_mbhc wcd_mbhc;
+	struct blocking_notifier_head notifier;
+	struct fw_info *fw_data;
+	bool mbhc_started;
+};
+
+#if IS_ENABLED(CONFIG_SND_SOC_WCD937X)
+extern int wcd937x_mbhc_init(struct wcd937x_mbhc **mbhc,
+			   struct snd_soc_codec *codec,
+			   struct fw_info *fw_data);
+extern void wcd937x_mbhc_hs_detect_exit(struct snd_soc_codec *codec);
+extern int wcd937x_mbhc_hs_detect(struct snd_soc_codec *codec,
+				struct wcd_mbhc_config *mbhc_cfg);
+extern void wcd937x_mbhc_deinit(struct snd_soc_codec *codec);
+extern int wcd937x_mbhc_post_ssr_init(struct wcd937x_mbhc *mbhc,
+				    struct snd_soc_codec *codec);
+extern int wcd937x_mbhc_get_impedance(struct wcd937x_mbhc *wcd937x_mbhc,
+				    uint32_t *zl, uint32_t *zr);
+#else
+static inline int wcd937x_mbhc_init(struct wcd937x_mbhc **mbhc,
+				  struct snd_soc_codec *codec,
+				  struct fw_info *fw_data)
+{
+	return 0;
+}
+static inline void wcd937x_mbhc_hs_detect_exit(struct snd_soc_codec *codec)
+{
+}
+static inline int wcd937x_mbhc_hs_detect(struct snd_soc_codec *codec,
+				       struct wcd_mbhc_config *mbhc_cfg)
+{
+		return 0;
+}
+static inline void wcd937x_mbhc_deinit(struct snd_soc_codec *codec)
+{
+}
+static inline int wcd937x_mbhc_post_ssr_init(struct wcd937x_mbhc *mbhc,
+					   struct snd_soc_codec *codec)
+{
+	return 0;
+}
+
+static inline int wcd937x_mbhc_get_impedance(struct wcd937x_mbhc *wcd937x_mbhc,
+					   uint32_t *zl, uint32_t *zr)
+{
+	if (zl)
+		*zl = 0;
+	if (zr)
+		*zr = 0;
+	return -EINVAL;
+}
+#endif
+
+#endif /* __WCD937X_MBHC_H__ */