ASoC: wcd9335: add CLASS-H Controller support

CLASS-H controller/Amplifier is common accorss Qualcomm WCD codec series.
This patchset adds basic CLASS-H controller apis for WCD codecs after
wcd9335 to use.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Makefile

@@ -192,7 +192,7 @@ snd-soc-twl4030-objs := twl4030.o
 snd-soc-twl6040-objs := twl6040.o
 snd-soc-uda134x-objs := uda134x.o
 snd-soc-uda1380-objs := uda1380.o
-snd-soc-wcd9335-objs := wcd9335.o
+snd-soc-wcd9335-objs := wcd-clsh.o wcd9335.o
 snd-soc-wl1273-objs := wl1273.o
 snd-soc-wm-adsp-objs := wm_adsp.o
 snd-soc-wm0010-objs := wm0010.o

sound/soc/codecs/wcd-clsh.h

+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _WCD_CLSH_V2_H_
+#define _WCD_CLSH_V2_H_
+#include <sound/soc.h>
+
+enum wcd_clsh_event {
+	WCD_CLSH_EVENT_PRE_DAC = 1,
+	WCD_CLSH_EVENT_POST_PA,
+};
+
+/*
+ * Basic states for Class H state machine.
+ * represented as a bit mask within a u8 data type
+ * bit 0: EAR mode
+ * bit 1: HPH Left mode
+ * bit 2: HPH Right mode
+ * bit 3: Lineout mode
+ */
+#define	WCD_CLSH_STATE_IDLE	0
+#define	WCD_CLSH_STATE_EAR	BIT(0)
+#define	WCD_CLSH_STATE_HPHL	BIT(1)
+#define	WCD_CLSH_STATE_HPHR	BIT(2)
+#define	WCD_CLSH_STATE_LO	BIT(3)
+#define WCD_CLSH_STATE_MAX	4
+#define NUM_CLSH_STATES_V2	BIT(WCD_CLSH_STATE_MAX)
+
+enum wcd_clsh_mode {
+	CLS_H_NORMAL = 0, /* Class-H Default */
+	CLS_H_HIFI, /* Class-H HiFi */
+	CLS_H_LP, /* Class-H Low Power */
+	CLS_AB, /* Class-AB */
+	CLS_H_LOHIFI, /* LoHIFI */
+	CLS_NONE, /* None of the above modes */
+};
+
+struct wcd_clsh_ctrl;
+
+extern struct wcd_clsh_ctrl *wcd_clsh_ctrl_alloc(
+				struct snd_soc_component *component,
+				int version);
+extern void wcd_clsh_ctrl_free(struct wcd_clsh_ctrl *ctrl);
+extern int wcd_clsh_ctrl_get_state(struct wcd_clsh_ctrl *ctrl);
+extern int wcd_clsh_ctrl_set_state(struct wcd_clsh_ctrl *ctrl,
+				   enum wcd_clsh_event event,
+				   int state,
+				   enum wcd_clsh_mode mode);
+
+#endif /* _WCD_CLSH_V2_H_ */

sound/soc/codecs/wcd9335.c

@@ -21,6 +21,7 @@
 #include <dt-bindings/mfd/wcd9335.h>
 #include <linux/mfd/wcd9335/wcd9335.h>
 #include <linux/mfd/wcd9335/registers.h>
+#include "wcd-clsh.h"
 
 #define WCD9335_RATES_MASK (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
 			    SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_48000 |\
@@ -181,6 +182,7 @@ struct wcd9335_codec {
 	int sido_ccl_cnt;
 	enum wcd_clock_type clk_type;
 
+	struct wcd_clsh_ctrl *clsh_ctrl;
 	u32 hph_mode;
 };
 
@@ -1066,6 +1068,13 @@ static int wcd9335_codec_probe(struct snd_soc_component *component)
 	int i;
 
 	snd_soc_component_init_regmap(component, wcd->regmap);
+	/* Class-H Init*/
+	wcd->clsh_ctrl = wcd_clsh_ctrl_alloc(component, wcd->version);
+	if (IS_ERR(wcd->clsh_ctrl))
+		return PTR_ERR(wcd->clsh_ctrl);
+
+	/* Default HPH Mode to Class-H HiFi */
+	wcd->hph_mode = CLS_H_HIFI;
 	wcd->component = component;
 
 	wcd9335_codec_init(component);
@@ -1080,6 +1089,7 @@ static void wcd9335_codec_remove(struct snd_soc_component *comp)
 {
 	struct wcd9335_codec *wcd = dev_get_drvdata(comp->dev);
 
+	wcd_clsh_ctrl_free(wcd->clsh_ctrl);
 	free_irq(regmap_irq_get_virq(wcd->irq_data, WCD9335_IRQ_SLIMBUS), wcd);
 }