Create an ALSA control to read the value of the firmware
CAL_SET_STATUS control. This reports whether the firmware is
using a calibration blob or the default calibration from the
.bin file.

The firmware only reports a valid value in this register while
audio is actually playing and the internal PLL is locked to the
audio clock. Otherwise it returns a status of "unknown".

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
 include/sound/cs35l56.h           |  9 ++++++
 sound/soc/codecs/cs35l56-shared.c | 48 +++++++++++++++++++++++++++++++
 sound/soc/codecs/cs35l56.c        | 16 +++++++++++
 3 files changed, 73 insertions(+)

diff --git a/include/sound/cs35l56.h b/include/sound/cs35l56.h
index 0a740a99ad31..bd13958bf19d 100644
--- a/include/sound/cs35l56.h
+++ b/include/sound/cs35l56.h
@@ -16,6 +16,8 @@
 #include <linux/spi/spi.h>
 #include <sound/cs-amp-lib.h>
 
+struct snd_ctl_elem_value;
+
 #define CS35L56_DEVID					0x0000000
 #define CS35L56_REVID					0x0000004
 #define CS35L56_RELID					0x000000C
@@ -268,6 +270,10 @@
 #define CS35L56_CAL_STATUS_SUCCESS			1
 #define CS35L56_CAL_STATUS_OUT_OF_RANGE			3
 
+#define CS35L56_CAL_SET_STATUS_UNKNOWN			0
+#define CS35L56_CAL_SET_STATUS_DEFAULT			1
+#define CS35L56_CAL_SET_STATUS_SET			2
+
 #define CS35L56_CONTROL_PORT_READY_US			2200
 #define CS35L56_HALO_STATE_POLL_US			1000
 #define CS35L56_HALO_STATE_TIMEOUT_US			250000
@@ -363,6 +369,7 @@ extern const struct regmap_config cs35l63_regmap_i2c;
 extern const struct regmap_config cs35l63_regmap_sdw;
 
 extern const struct cirrus_amp_cal_controls cs35l56_calibration_controls;
+extern const char * const cs35l56_cal_set_status_text[3];
 
 extern const char * const cs35l56_tx_input_texts[CS35L56_NUM_INPUT_SRC];
 extern const unsigned int cs35l56_tx_input_values[CS35L56_NUM_INPUT_SRC];
@@ -396,6 +403,8 @@ ssize_t cs35l56_cal_data_debugfs_write(struct cs35l56_base *cs35l56_base,
 void cs35l56_create_cal_debugfs(struct cs35l56_base *cs35l56_base,
 				const struct cs35l56_cal_debugfs_fops *fops);
 void cs35l56_remove_cal_debugfs(struct cs35l56_base *cs35l56_base);
+int cs35l56_cal_set_status_get(struct cs35l56_base *cs35l56_base,
+			       struct snd_ctl_elem_value *uvalue);
 int cs35l56_read_prot_status(struct cs35l56_base *cs35l56_base,
 			     bool *fw_missing, unsigned int *fw_version);
 void cs35l56_log_tuning(struct cs35l56_base *cs35l56_base, struct cs_dsp *cs_dsp);
diff --git a/sound/soc/codecs/cs35l56-shared.c b/sound/soc/codecs/cs35l56-shared.c
index fe0693c3f7de..4fba4127c40c 100644
--- a/sound/soc/codecs/cs35l56-shared.c
+++ b/sound/soc/codecs/cs35l56-shared.c
@@ -1262,6 +1262,54 @@ void cs35l56_remove_cal_debugfs(struct cs35l56_base *cs35l56_base)
 }
 EXPORT_SYMBOL_NS_GPL(cs35l56_remove_cal_debugfs, "SND_SOC_CS35L56_SHARED");
 
+const char * const cs35l56_cal_set_status_text[] = {
+	"Unknown", "Default", "Set",
+};
+EXPORT_SYMBOL_NS_GPL(cs35l56_cal_set_status_text, "SND_SOC_CS35L56_SHARED");
+
+int cs35l56_cal_set_status_get(struct cs35l56_base *cs35l56_base,
+			       struct snd_ctl_elem_value *uvalue)
+{
+	struct cs_dsp *dsp = cs35l56_base->dsp;
+	__be32 cal_set_status_be;
+	int alg_id;
+	int ret;
+
+	switch (cs35l56_base->type) {
+	case 0x54:
+	case 0x56:
+	case 0x57:
+		alg_id = 0x9f210;
+		break;
+	default:
+		alg_id = 0xbf210;
+		break;
+	}
+
+	scoped_guard(mutex, &dsp->pwr_lock) {
+		ret = cs_dsp_coeff_read_ctrl(cs_dsp_get_ctl(dsp,
+							    "CAL_SET_STATUS",
+							    WMFW_ADSP2_YM, alg_id),
+					      0, &cal_set_status_be,
+					      sizeof(cal_set_status_be));
+	}
+	if (ret) {
+		uvalue->value.enumerated.item[0] = CS35L56_CAL_SET_STATUS_UNKNOWN;
+		return 0;
+	}
+
+	switch (be32_to_cpu(cal_set_status_be)) {
+	case CS35L56_CAL_SET_STATUS_DEFAULT:
+	case CS35L56_CAL_SET_STATUS_SET:
+		uvalue->value.enumerated.item[0] = be32_to_cpu(cal_set_status_be);
+		return 0;
+	default:
+		uvalue->value.enumerated.item[0] = CS35L56_CAL_SET_STATUS_UNKNOWN;
+		return 0;
+	}
+}
+EXPORT_SYMBOL_NS_GPL(cs35l56_cal_set_status_get, "SND_SOC_CS35L56_SHARED");
+
 int cs35l56_read_prot_status(struct cs35l56_base *cs35l56_base,
 			     bool *fw_missing, unsigned int *fw_version)
 {
diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c
index 091a72325507..e1eb7360b058 100644
--- a/sound/soc/codecs/cs35l56.c
+++ b/sound/soc/codecs/cs35l56.c
@@ -66,6 +66,18 @@ static int cs35l56_dspwait_put_volsw(struct snd_kcontrol *kcontrol,
 
 static DECLARE_TLV_DB_SCALE(vol_tlv, -10000, 25, 0);
 
+static SOC_ENUM_SINGLE_DECL(cs35l56_cal_set_status_enum, SND_SOC_NOPM, 0,
+			    cs35l56_cal_set_status_text);
+
+static int cs35l56_cal_set_status_ctl_get(struct snd_kcontrol *kcontrol,
+					  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct cs35l56_private *cs35l56 = snd_soc_component_get_drvdata(component);
+
+	return cs35l56_cal_set_status_get(&cs35l56->base, ucontrol);
+}
+
 static const struct snd_kcontrol_new cs35l56_controls[] = {
 	SOC_SINGLE_EXT("Speaker Switch",
 		       CS35L56_MAIN_RENDER_USER_MUTE, 0, 1, 1,
@@ -83,6 +95,8 @@ static const struct snd_kcontrol_new cs35l56_controls[] = {
 	SOC_SINGLE_EXT("Posture Number", CS35L56_MAIN_POSTURE_NUMBER,
 		       0, 255, 0,
 		       cs35l56_dspwait_get_volsw, cs35l56_dspwait_put_volsw),
+	SOC_ENUM_EXT("CAL_SET_STATUS", cs35l56_cal_set_status_enum,
+		     cs35l56_cal_set_status_ctl_get, NULL),
 };
 
 static const struct snd_kcontrol_new cs35l63_controls[] = {
@@ -102,6 +116,8 @@ static const struct snd_kcontrol_new cs35l63_controls[] = {
 	SOC_SINGLE_EXT("Posture Number", CS35L63_MAIN_POSTURE_NUMBER,
 		       0, 255, 0,
 		       cs35l56_dspwait_get_volsw, cs35l56_dspwait_put_volsw),
+	SOC_ENUM_EXT("CAL_SET_STATUS", cs35l56_cal_set_status_enum,
+		     cs35l56_cal_set_status_ctl_get, NULL),
 };
 
 static SOC_VALUE_ENUM_SINGLE_DECL(cs35l56_asp1tx1_enum,
-- 
2.47.3