regmap: regmap-irq/gpio-max77620: add level-irq support

Add level active IRQ support to regmap-irq irqchip. Change breaks
existing regmap-irq type setting. Convert the existing drivers which
use regmap-irq with trigger type setting (gpio-max77620) to work
with this new approach. So we do not magically support level-active
IRQs on gpio-max77620 - but add support to the regmap-irq for chips
which support them =)

We do not support distinguishing situation where HW supports rising
and falling edge detection but not both. Separating this would require
inventing yet another flags for IRQ types.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap-irq.c

@@ -199,7 +199,7 @@ static void regmap_irq_enable(struct irq_data *data)
 	const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->hwirq);
 	unsigned int mask, type;
 
-	type = irq_data->type_falling_mask | irq_data->type_rising_mask;
+	type = irq_data->type.type_falling_val | irq_data->type.type_rising_val;
 
 	/*
 	 * The type_in_mask flag means that the underlying hardware uses
@@ -234,27 +234,42 @@ static int regmap_irq_set_type(struct irq_data *data, unsigned int type)
 	struct regmap_irq_chip_data *d = irq_data_get_irq_chip_data(data);
 	struct regmap *map = d->map;
 	const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->hwirq);
-	int reg = irq_data->type_reg_offset / map->reg_stride;
+	int reg;
+	const struct regmap_irq_type *t = &irq_data->type;
 
-	if (!(irq_data->type_rising_mask | irq_data->type_falling_mask))
-		return 0;
+	if ((t->types_supported & type) != type)
+		return -ENOTSUPP;
 
-	d->type_buf[reg] &= ~(irq_data->type_falling_mask |
-					irq_data->type_rising_mask);
+	reg = t->type_reg_offset / map->reg_stride;
+
+	if (t->type_reg_mask)
+		d->type_buf[reg] &= ~t->type_reg_mask;
+	else
+		d->type_buf[reg] &= ~(t->type_falling_val |
+				      t->type_rising_val |
+				      t->type_level_low_val |
+				      t->type_level_high_val);
 	switch (type) {
 	case IRQ_TYPE_EDGE_FALLING:
-		d->type_buf[reg] |= irq_data->type_falling_mask;
+		d->type_buf[reg] |= t->type_falling_val;
 		break;
 
 	case IRQ_TYPE_EDGE_RISING:
-		d->type_buf[reg] |= irq_data->type_rising_mask;
+		d->type_buf[reg] |= t->type_rising_val;
 		break;
 
 	case IRQ_TYPE_EDGE_BOTH:
-		d->type_buf[reg] |= (irq_data->type_falling_mask |
-					irq_data->type_rising_mask);
+		d->type_buf[reg] |= (t->type_falling_val |
+					t->type_rising_val);
 		break;
 
+	case IRQ_TYPE_LEVEL_HIGH:
+		d->type_buf[reg] |= t->type_level_high_val;
+		break;
+
+	case IRQ_TYPE_LEVEL_LOW:
+		d->type_buf[reg] |= t->type_level_low_val;
+		break;
 	default:
 		return -EINVAL;
 	}