gpio: mockup: support irqmask and irqunmask

Even though this is a testing module, be nice and actually implement
these functions.

Signed-off-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-mockup.c

···
 struct gpio_mockup_line_status {
 	int dir;
 	bool value;
+	bool irq_enabled;
 };
 
 struct gpio_mockup_irq_context {
···
 	return chip->irq_base + offset;
 }
 
-/*
- * While we should generally support irqmask and irqunmask, this driver is
- * for testing purposes only so we don't care.
- */
-static void gpio_mockup_irqmask(struct irq_data *d) { }
-static void gpio_mockup_irqunmask(struct irq_data *d) { }
+static void gpio_mockup_irqmask(struct irq_data *data)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
+
+	chip->lines[data->irq - gc->irq_base].irq_enabled = false;
+}
+
+static void gpio_mockup_irqunmask(struct irq_data *data)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+	struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
+
+	chip->lines[data->irq - gc->irq_base].irq_enabled = true;
+}
 
 static struct irq_chip gpio_mockup_irqchip = {
 	.name		= GPIO_MOCKUP_NAME,
···
 
 	for (i = 0; i < gc->ngpio; i++) {
 		irq_set_chip(irq_base + i, gc->irqchip);
+		irq_set_chip_data(irq_base + i, gc);
 		irq_set_handler(irq_base + i, &handle_simple_irq);
 		irq_modify_status(irq_base + i,
 				  IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
···
 	desc = priv->desc;
 	chip = priv->chip;
 	gc = &chip->gc;
+
+	if (!chip->lines[priv->offset].irq_enabled)
+		return size;
 
 	if (copy_from_user(&buf, usr_buf, 1))
 		return -EFAULT;