[PATCH v3 1/4] ASoC: SDCA: Add SDCA IRQ enable/disable helpers

[Charles Keepax <ckeepax@opensource.cirrus.com>]

Add helpers to enable and disable the SDCA IRQs by Function. These are
useful to sequence the powering down and up around system suspend.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---

Changes since v2:
 - Update some kernel doc.

 include/sound/sdca_interrupts.h  |  7 +++
 sound/soc/sdca/sdca_interrupts.c | 76 ++++++++++++++++++++++++++++++++
 2 files changed, 83 insertions(+)

diff --git a/include/sound/sdca_interrupts.h b/include/sound/sdca_interrupts.h
index 8f13417d129ab..9bcb5d8fd592b 100644
--- a/include/sound/sdca_interrupts.h
+++ b/include/sound/sdca_interrupts.h
@@ -84,4 +84,11 @@ int sdca_irq_populate(struct sdca_function_data *function,
 struct sdca_interrupt_info *sdca_irq_allocate(struct device *dev,
 					      struct regmap *regmap, int irq);
 
+void sdca_irq_enable_early(struct sdca_function_data *function,
+			   struct sdca_interrupt_info *info);
+void sdca_irq_enable(struct sdca_function_data *function,
+		     struct sdca_interrupt_info *info);
+void sdca_irq_disable(struct sdca_function_data *function,
+		      struct sdca_interrupt_info *info);
+
 #endif
diff --git a/sound/soc/sdca/sdca_interrupts.c b/sound/soc/sdca/sdca_interrupts.c
index ff3a7e405fdcb..afef7bbf613c9 100644
--- a/sound/soc/sdca/sdca_interrupts.c
+++ b/sound/soc/sdca/sdca_interrupts.c
@@ -541,3 +541,79 @@ struct sdca_interrupt_info *sdca_irq_allocate(struct device *sdev,
 	return info;
 }
 EXPORT_SYMBOL_NS_GPL(sdca_irq_allocate, "SND_SOC_SDCA");
+
+static void irq_enable_flags(struct sdca_function_data *function,
+			     struct sdca_interrupt_info *info, bool early)
+{
+	struct sdca_interrupt *interrupt;
+	int i;
+
+	for (i = 0; i < SDCA_MAX_INTERRUPTS; i++) {
+		interrupt = &info->irqs[i];
+
+		if (!interrupt || interrupt->function != function)
+			continue;
+
+		switch (SDCA_CTL_TYPE(interrupt->entity->type,
+				      interrupt->control->sel)) {
+		case SDCA_CTL_TYPE_S(XU, FDL_CURRENTOWNER):
+			if (early)
+				enable_irq(interrupt->irq);
+			break;
+		default:
+			if (!early)
+				enable_irq(interrupt->irq);
+			break;
+		}
+	}
+}
+
+/**
+ * sdca_irq_enable_early - Re-enable early SDCA IRQs for a given function
+ * @function: Pointer to the SDCA Function.
+ * @info: Pointer to the SDCA interrupt info for this device.
+ *
+ * The early version of the IRQ enable allows enabling IRQs which may be
+ * necessary to bootstrap functionality for other IRQs, such as the FDL
+ * process.
+ */
+void sdca_irq_enable_early(struct sdca_function_data *function,
+			   struct sdca_interrupt_info *info)
+{
+	irq_enable_flags(function, info, true);
+}
+EXPORT_SYMBOL_NS_GPL(sdca_irq_enable_early, "SND_SOC_SDCA");
+
+/**
+ * sdca_irq_enable - Re-enable SDCA IRQs for a given function
+ * @function: Pointer to the SDCA Function.
+ * @info: Pointer to the SDCA interrupt info for this device.
+ */
+void sdca_irq_enable(struct sdca_function_data *function,
+		     struct sdca_interrupt_info *info)
+{
+	irq_enable_flags(function, info, false);
+}
+EXPORT_SYMBOL_NS_GPL(sdca_irq_enable, "SND_SOC_SDCA");
+
+/**
+ * sdca_irq_disable - Disable SDCA IRQs for a given function
+ * @function: Pointer to the SDCA Function.
+ * @info: Pointer to the SDCA interrupt info for this device.
+ */
+void sdca_irq_disable(struct sdca_function_data *function,
+		      struct sdca_interrupt_info *info)
+{
+	struct sdca_interrupt *interrupt;
+	int i;
+
+	for (i = 0; i < SDCA_MAX_INTERRUPTS; i++) {
+		interrupt = &info->irqs[i];
+
+		if (!interrupt || interrupt->function != function)
+			continue;
+
+		disable_irq(interrupt->irq);
+	}
+}
+EXPORT_SYMBOL_NS_GPL(sdca_irq_disable, "SND_SOC_SDCA");
-- 
2.47.3