gpio: 104-idio-16: Add set_multiple callback function support

The ACCES 104-IDIO-16 series provides registers where 8 lines of GPIO
may be set at a time. This patch add support for the set_multiple
callback function, thus allowing multiple GPIO output lines to be set
more efficiently in groups.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index 6787b8f..a57900f 100644 (file)
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -116,6 +116,25 @@ static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
        spin_unlock_irqrestore(&idio16gpio->lock, flags);
 }
 
+static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
+       unsigned long *mask, unsigned long *bits)
+{
+       struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
+       unsigned long flags;
+
+       spin_lock_irqsave(&idio16gpio->lock, flags);
+
+       idio16gpio->out_state &= ~*mask;
+       idio16gpio->out_state |= *mask & *bits;
+
+       if (*mask & 0xFF)
+               outb(idio16gpio->out_state, idio16gpio->base);
+       if ((*mask >> 8) & 0xFF)
+               outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
+
+       spin_unlock_irqrestore(&idio16gpio->lock, flags);
+}
+
 static void idio_16_irq_ack(struct irq_data *data)
 {
 }
@@ -219,6 +238,7 @@ static int idio_16_probe(struct device *dev, unsigned int id)
        idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
        idio16gpio->chip.get = idio_16_gpio_get;
        idio16gpio->chip.set = idio_16_gpio_set;
+       idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
        idio16gpio->base = base[id];
        idio16gpio->irq = irq[id];
        idio16gpio->out_state = 0xFFFF;