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gpio: 104-idio-16: Clear pending interrupt in IRQ handler 

The ACCES 104-IDIO-16 uses a single interrupt to indicate a possible
change-of-state in any of the digital input lines. As such, only a
single write to the device's "Clear Interrupt" register is necessary to
acknowledge the IRQ for all respective GPIO.

This patch moves the "Clear Interrupt" register write operation from the
irq_ack callback to the IRQ handler function, wherefore each interrupt
may be cleared respectively by executing a single outb call at the end
of the idio_16_irq_handler function, rather than multiple redundant outb
calls as a result of the generic_handle_irq call for each masked GPIO.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
William Breathitt Gray 2015-12-02 20:23:04 -05:00 committed by Linus Walleij
parent 01821412ee
commit 12b61c9d7e
1 changed files with 7 additions and 10 deletions
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17
drivers/gpio/gpio-104-idio-16.c
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@ -117,15 +117,6 @@ static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
static void idio_16_irq_ack(struct irq_data *data)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct idio_16_gpio *const idio16gpio = to_idio16gpio(chip);
unsigned long flags;
spin_lock_irqsave(&idio16gpio->lock, flags);
outb(0, idio16gpio->base + 1);
spin_unlock_irqrestore(&idio16gpio->lock, flags);
}
static void idio_16_irq_mask(struct irq_data *data)
@ -159,7 +150,6 @@ static void idio_16_irq_unmask(struct irq_data *data)
if (!prev_irq_mask) {
spin_lock_irqsave(&idio16gpio->lock, flags);
outb(0, idio16gpio->base + 1);
inb(idio16gpio->base + 2);
spin_unlock_irqrestore(&idio16gpio->lock, flags);
@ -193,6 +183,12 @@ static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
generic_handle_irq(irq_find_mapping(chip->irqdomain, gpio));
spin_lock(&idio16gpio->lock);
outb(0, idio16gpio->base + 1);
spin_unlock(&idio16gpio->lock);
return IRQ_HANDLED;
}
@ -244,6 +240,7 @@ static int __init idio_16_probe(struct platform_device *pdev)
/* Disable IRQ by default */
outb(0, base + 2);
outb(0, base + 1);
err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
handle_edge_irq, IRQ_TYPE_NONE);