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| author | William Breathitt Gray <vilhelm.gray@gmail.com> | 2018-03-22 13:59:37 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-03-26 10:10:18 +0200 |
| commit | 15f59cfff92bcbbb67e1b7ebb4d10b845797bdeb (patch) | |
| tree | f730e0d79580385290b2ae9cd5a131285c51f31b | |
| parent | Documentation: gpio: Move drivers-on-gpio.txt to driver-api (diff) | |
| download | linux-15f59cfff92bcbbb67e1b7ebb4d10b845797bdeb.tar.xz linux-15f59cfff92bcbbb67e1b7ebb4d10b845797bdeb.zip | |
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>
| -rw-r--r-- | drivers/gpio/gpio-104-idio-16.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c index 2f16638a0589..96700308c1e3 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 & 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]; |