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gpiolib: add support for biasing output lines

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Allow pull up/down bias to be set on output lines.
Use case is for open source or open drain applications where
internal pull up/down may conflict with external biasing.

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 10:04:26 +08:00 committed by Bartosz Golaszewski
parent 2148ad7790
commit 2821ae5f30
1 changed files with 6 additions and 2 deletions
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8
drivers/gpio/gpiolib.c
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@ -556,8 +556,9 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
(lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
return -EINVAL;
/* Bias flags only allowed for input mode. */
if (!(lflags & GPIOHANDLE_REQUEST_INPUT) &&
/* Bias flags only allowed for input or output mode. */
if (!((lflags & GPIOHANDLE_REQUEST_INPUT) ||
(lflags & GPIOHANDLE_REQUEST_OUTPUT)) &&
((lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE) ||
(lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP) ||
(lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)))
@ -3169,6 +3170,9 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
}
set_output_value:
ret = gpio_set_bias(gc, desc);
if (ret)
return ret;
return gpiod_direction_output_raw_commit(desc, value);
set_output_flag: