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gpiolib: add support for disabling line bias

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Allow pull up/down bias to be disabled, allowing the line to float
or to be biased only by external circuitry.
Use case is for where the bias has been applied previously, either
by default or by the user, but that setting may conflict with the
current use of the line.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Kent Gibson
2019-11-05 10:04:25 +08:00
committed by Bartosz Golaszewski
parent 7b479a8448
commit 2148ad7790
3 changed files with 54 additions and 10 deletions
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2
include/uapi/linux/gpio.h
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@@ -35,6 +35,7 @@ struct gpiochip_info {
#define GPIOLINE_FLAG_OPEN_SOURCE (1UL << 4)
#define GPIOLINE_FLAG_BIAS_PULL_UP (1UL << 5)
#define GPIOLINE_FLAG_BIAS_PULL_DOWN (1UL << 6)
#define GPIOLINE_FLAG_BIAS_DISABLE (1UL << 7)
/**
* struct gpioline_info - Information about a certain GPIO line
@@ -66,6 +67,7 @@ struct gpioline_info {
#define GPIOHANDLE_REQUEST_OPEN_SOURCE (1UL << 4)
#define GPIOHANDLE_REQUEST_BIAS_PULL_UP (1UL << 5)
#define GPIOHANDLE_REQUEST_BIAS_PULL_DOWN (1UL << 6)
#define GPIOHANDLE_REQUEST_BIAS_DISABLE (1UL << 7)
/**
* struct gpiohandle_request - Information about a GPIO handle request