gpio: Add helpers to ease the transition towards immutable irq_chip

Add a couple of new helpers to make it slightly simpler to convert drivers to immutable irq_chip structures: - GPIOCHIP_IRQ_RESOURCE_HELPERS populates the irq_chip structure with the resource management callbacks - gpio_irq_chip_set_chip() populates the gpio_irq_chip.chip structure, avoiding the proliferation of ugly casts

Marc Zyngier committed 4 years ago

Commit 36b78aa1 parent 704f0871 file · +12 −0Browse files

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include/linux/gpio/driver.h+12−0

@@ -583,6 +583,18 @@ void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset); · 582 unmodified lines
583	583	int gpiochip_irq_reqres(struct irq_data *data);
584	584	void gpiochip_irq_relres(struct irq_data *data);
585	585
	586	+/* Paste this in your irq_chip structure */
	587	+#define GPIOCHIP_IRQ_RESOURCE_HELPERS \
	588	+ .irq_request_resources = gpiochip_irq_reqres, \
	589	+ .irq_release_resources = gpiochip_irq_relres
	590	+
	591	+static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
	592	+ const struct irq_chip *chip)
	593	+{
	594	+ /* Yes, dropping const is ugly, but it isn't like we have a choice */
	595	+ girq->chip = (struct irq_chip *)chip;
	596	+}
	597	+
586	598	/* Line status inquiry for drivers */
587	599	bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset);
588	600	bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);