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gpio: 104-idio-16: Implement get_multiple callback 

The ACCES I/O 104-IDIO-16 series of devices provides 16
optically-isolated digital inputs accessed via two 8-bit ports. Since
eight input lines are acquired on a single port input read, the
104-IDIO-16 GPIO driver may improve multiple input reads by utilizing a
get_multiple callback. This patch implements the
idio_16_gpio_get_multiple function which serves as the respective
get_multiple callback.

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 2018-03-22 08:59:37 -04:00 committed by Linus Walleij
parent 4784e710b1
commit 15f59cfff9
1 changed files with 15 additions and 0 deletions
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15
drivers/gpio/gpio-104-idio-16.c
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@ -90,6 +90,20 @@ static int idio_16_gpio_get(struct gpio_chip *chip, unsigned offset)
return !!(inb(idio16gpio->base + 5) & (mask>>8));
}
static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
unsigned long *mask, unsigned long *bits)
{
struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
*bits = 0;
if (*mask & GENMASK(23, 16))
*bits |= (unsigned long)inb(idio16gpio->base + 1) << 16;
if (*mask & GENMASK(31, 24))
*bits |= (unsigned long)inb(idio16gpio->base + 5) << 24;
return 0;
}
static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
@ -244,6 +258,7 @@ static int idio_16_probe(struct device *dev, unsigned int id)
idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
idio16gpio->chip.get = idio_16_gpio_get;
idio16gpio->chip.get_multiple = idio_16_gpio_get_multiple;
idio16gpio->chip.set = idio_16_gpio_set;
idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
idio16gpio->base = base[id];