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| author | Drew Fustini <drew@pdp7.com> | 2019-11-05 10:04:23 +0800 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2019-11-12 16:30:30 +0100 |
| commit | 9225d5169d110734099a82c39c073a11e399cb3f (patch) | |
| tree | ce801bf8c51d4dc21533dca65d8c2f8d87562a2a /include | |
| parent | f932a68695e4c7d92e721d2c23580d9f35494662 (diff) | |
| download | linux-9225d5169d110734099a82c39c073a11e399cb3f.tar.gz linux-9225d5169d110734099a82c39c073a11e399cb3f.tar.bz2 linux-9225d5169d110734099a82c39c073a11e399cb3f.zip | |
gpio: expose pull-up/pull-down line flags to userspace
Add pull-up/pull-down flags to the gpio line get and
set ioctl() calls. Use cases include a push button
that does not have an external resistor.
Addition use cases described by Limor Fried (ladyada) of
Adafruit in this PR for Adafruit_Blinka Python lib:
https://github.com/adafruit/Adafruit_Blinka/pull/59
Signed-off-by: Drew Fustini <drew@pdp7.com>
[Kent: added BIAS to GPIO flag names and restrict application to input
lines]
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/gpio.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/uapi/linux/gpio.h b/include/uapi/linux/gpio.h index 4ebfe0ac6c5b..39e6c7854d63 100644 --- a/include/uapi/linux/gpio.h +++ b/include/uapi/linux/gpio.h @@ -33,6 +33,8 @@ struct gpiochip_info { #define GPIOLINE_FLAG_ACTIVE_LOW (1UL << 2) #define GPIOLINE_FLAG_OPEN_DRAIN (1UL << 3) #define GPIOLINE_FLAG_OPEN_SOURCE (1UL << 4) +#define GPIOLINE_FLAG_BIAS_PULL_UP (1UL << 5) +#define GPIOLINE_FLAG_BIAS_PULL_DOWN (1UL << 6) /** * struct gpioline_info - Information about a certain GPIO line @@ -62,6 +64,8 @@ struct gpioline_info { #define GPIOHANDLE_REQUEST_ACTIVE_LOW (1UL << 2) #define GPIOHANDLE_REQUEST_OPEN_DRAIN (1UL << 3) #define GPIOHANDLE_REQUEST_OPEN_SOURCE (1UL << 4) +#define GPIOHANDLE_REQUEST_BIAS_PULL_UP (1UL << 5) +#define GPIOHANDLE_REQUEST_BIAS_PULL_DOWN (1UL << 6) /** * struct gpiohandle_request - Information about a GPIO handle request |