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    Subject[PATCH v3 2/8] gpio: 104-idio-16: Implement get_multiple callback
    Date
    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>
    ---
    drivers/gpio/gpio-104-idio-16.c | 15 +++++++++++++++
    1 file changed, 15 insertions(+)

    diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
    index 2f16638a0589..5de5819e5156 100644
    --- a/drivers/gpio/gpio-104-idio-16.c
    +++ b/drivers/gpio/gpio-104-idio-16.c
    @@ -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 & 0xFF0000)
    + *bits |= (unsigned long)inb(idio16gpio->base + 1) << 16;
    + if (*mask & 0xFF000000)
    + *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];
    --
    2.16.2
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