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| author | William Breathitt Gray <vilhelm.gray@gmail.com> | 2018-03-17 11:49:56 -0400 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2018-03-17 16:21:27 +0000 |
| commit | dcbe3ccd8ad5a0cef2a038478ad80e3d6f921815 (patch) | |
| tree | 07d978edcf3a9465af0a1899e7dc427efd0a538b /drivers/iio/adc/stx104.c | |
| parent | c26dd817d99bc50acf2667ee27c39414a7a6638e (diff) | |
| download | linux-dcbe3ccd8ad5a0cef2a038478ad80e3d6f921815.tar.gz linux-dcbe3ccd8ad5a0cef2a038478ad80e3d6f921815.tar.bz2 linux-dcbe3ccd8ad5a0cef2a038478ad80e3d6f921815.zip | |
iio: stx104: Implement get_multiple callback
The Apex Embedded Systems STX104 series of devices provides 4 TTL
compatible lines of inputs accessed via a single 4-bit port. Since four
input lines are acquired on a single port input read, the STX104 GPIO
driver may improve multiple input reads by utilizing a get_multiple
callback. This patch implements the stx104_gpio_get_multiple function
which serves as the respective get_multiple callback.
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/adc/stx104.c')
| -rw-r--r-- | drivers/iio/adc/stx104.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/iio/adc/stx104.c b/drivers/iio/adc/stx104.c index 17b021f33180..0662ca199eb0 100644 --- a/drivers/iio/adc/stx104.c +++ b/drivers/iio/adc/stx104.c @@ -233,6 +233,16 @@ static int stx104_gpio_get(struct gpio_chip *chip, unsigned int offset) return !!(inb(stx104gpio->base) & BIT(offset)); } +static int stx104_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, + unsigned long *bits) +{ + struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip); + + *bits = inb(stx104gpio->base); + + return 0; +} + static void stx104_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { @@ -342,6 +352,7 @@ static int stx104_probe(struct device *dev, unsigned int id) stx104gpio->chip.direction_input = stx104_gpio_direction_input; stx104gpio->chip.direction_output = stx104_gpio_direction_output; stx104gpio->chip.get = stx104_gpio_get; + stx104gpio->chip.get_multiple = stx104_gpio_get_multiple; stx104gpio->chip.set = stx104_gpio_set; stx104gpio->chip.set_multiple = stx104_gpio_set_multiple; stx104gpio->base = base[id] + 3; |