[PATCH V6] mfd: da9062: Add support for interrupt polarity defined in device tree

[Shreyas Joshi <shreyasjoshi15@gmail.com>]

The da9062 interrupt handler cannot necessarily be low active.
Add a function to configure the interrupt type based on what is defined in the device tree.
The allowable interrupt type is either low or high level trigger.

Signed-off-by: Shreyas Joshi <shreyas.joshi@biamp.com>
---

V6:
  Changed regmap_reg_range to exclude DA9062AA_CONFIG_B for writeable
  Added regmap_reg_range DA9062AA_CONFIG_A for readable

V5:
  Added #define for DA9062_IRQ_HIGH and DA9062_IRQ_LOW 

V4:
  Changed return code to EINVAL rather than EIO for incorrect irq type
  Corrected regmap_update_bits usage
  
V3:
  Changed regmap_write to regmap_update_bits

V2:
  Added function to update the polarity of CONFIG_A IRQ_TYPE
  
 drivers/mfd/da9062-core.c | 44 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/da9062-core.c b/drivers/mfd/da9062-core.c
index 419c73533401..fc30726e2e27 100644
--- a/drivers/mfd/da9062-core.c
+++ b/drivers/mfd/da9062-core.c
@@ -21,6 +21,9 @@
 #define	DA9062_REG_EVENT_B_OFFSET	1
 #define	DA9062_REG_EVENT_C_OFFSET	2
 
+#define	DA9062_IRQ_LOW	0
+#define	DA9062_IRQ_HIGH	1
+
 static struct regmap_irq da9061_irqs[] = {
 	/* EVENT A */
 	[DA9061_IRQ_ONKEY] = {
@@ -369,6 +372,33 @@ static int da9062_get_device_type(struct da9062 *chip)
 	return ret;
 }
 
+static u32 da9062_configure_irq_type(struct da9062 *chip, int irq, u32 *trigger)
+{
+	u32 irq_type = 0;
+	struct irq_data *irq_data = irq_get_irq_data(irq);
+
+	if (!irq_data) {
+		dev_err(chip->dev, "Invalid IRQ: %d\n", irq);
+		return -EINVAL;
+	}
+	*trigger = irqd_get_trigger_type(irq_data);
+
+	switch (*trigger) {
+	case IRQ_TYPE_LEVEL_HIGH:
+		irq_type = DA9062_IRQ_HIGH;
+		break;
+	case IRQ_TYPE_LEVEL_LOW:
+		irq_type = DA9062_IRQ_LOW;
+		break;
+	default:
+		dev_warn(chip->dev, "Unsupported IRQ type: %d\n", *trigger);
+		return -EINVAL;
+	}
+	return regmap_update_bits(chip->regmap, DA9062AA_CONFIG_A,
+			DA9062AA_IRQ_TYPE_MASK,
+			irq_type << DA9062AA_IRQ_TYPE_SHIFT);
+}
+
 static const struct regmap_range da9061_aa_readable_ranges[] = {
 	regmap_reg_range(DA9062AA_PAGE_CON, DA9062AA_STATUS_B),
 	regmap_reg_range(DA9062AA_STATUS_D, DA9062AA_EVENT_C),
@@ -388,6 +418,7 @@ static const struct regmap_range da9061_aa_readable_ranges[] = {
 	regmap_reg_range(DA9062AA_VBUCK1_A, DA9062AA_VBUCK4_A),
 	regmap_reg_range(DA9062AA_VBUCK3_A, DA9062AA_VBUCK3_A),
 	regmap_reg_range(DA9062AA_VLDO1_A, DA9062AA_VLDO4_A),
+	regmap_reg_range(DA9062AA_CONFIG_A, DA9062AA_CONFIG_A),
 	regmap_reg_range(DA9062AA_VBUCK1_B, DA9062AA_VBUCK4_B),
 	regmap_reg_range(DA9062AA_VBUCK3_B, DA9062AA_VBUCK3_B),
 	regmap_reg_range(DA9062AA_VLDO1_B, DA9062AA_VLDO4_B),
@@ -417,6 +448,7 @@ static const struct regmap_range da9061_aa_writeable_ranges[] = {
 	regmap_reg_range(DA9062AA_VBUCK1_A, DA9062AA_VBUCK4_A),
 	regmap_reg_range(DA9062AA_VBUCK3_A, DA9062AA_VBUCK3_A),
 	regmap_reg_range(DA9062AA_VLDO1_A, DA9062AA_VLDO4_A),
+	regmap_reg_range(DA9062AA_CONFIG_A, DA9062AA_CONFIG_A),
 	regmap_reg_range(DA9062AA_VBUCK1_B, DA9062AA_VBUCK4_B),
 	regmap_reg_range(DA9062AA_VBUCK3_B, DA9062AA_VBUCK3_B),
 	regmap_reg_range(DA9062AA_VLDO1_B, DA9062AA_VLDO4_B),
@@ -596,6 +628,7 @@ static int da9062_i2c_probe(struct i2c_client *i2c,
 	const struct regmap_irq_chip *irq_chip;
 	const struct regmap_config *config;
 	int cell_num;
+	u32 trigger_type = 0;
 	int ret;
 
 	chip = devm_kzalloc(&i2c->dev, sizeof(*chip), GFP_KERNEL);
@@ -654,10 +687,15 @@ static int da9062_i2c_probe(struct i2c_client *i2c,
 	if (ret)
 		return ret;
 
+	ret = da9062_configure_irq_type(chip, i2c->irq, &trigger_type);
+	if (ret < 0) {
+		dev_err(chip->dev, "Failed to configure IRQ type\n");
+		return ret;
+	}
+
 	ret = regmap_add_irq_chip(chip->regmap, i2c->irq,
-			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
-			-1, irq_chip,
-			&chip->regmap_irq);
+			trigger_type | IRQF_SHARED | IRQF_ONESHOT,
+			-1, irq_chip, &chip->regmap_irq);
 	if (ret) {
 		dev_err(chip->dev, "Failed to request IRQ %d: %d\n",
 			i2c->irq, ret);
-- 
2.20.1