From: Kent Gibson <warthog618@gmail.com>
To: linux-gpio@vger.kernel.org, bgolaszewski@baylibre.com,
linus.walleij@linaro.org, bamv2005@gmail.com
Cc: drew@pdp7.com, Kent Gibson <warthog618@gmail.com>
Subject: [PATCH v3 5/5] gpiolib: add support for biasing output lines
Date: Sun, 20 Oct 2019 22:42:38 +0800 [thread overview]
Message-ID: <20191020144238.14080-6-warthog618@gmail.com> (raw)
In-Reply-To: <20191020144238.14080-1-warthog618@gmail.com>
This patch allows pull up/down bias to be set on outputs.
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>
---
drivers/gpio/gpiolib.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index b6fdaedc793a..f1f6a390e7f5 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -555,8 +555,9 @@ 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_DOWN) ||
(lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)))
@@ -3132,6 +3133,7 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
}
set_output_value:
+ gpio_set_bias(gc, desc);
return gpiod_direction_output_raw_commit(desc, value);
}
EXPORT_SYMBOL_GPL(gpiod_direction_output);
--
2.23.0
prev parent reply other threads:[~2019-10-20 14:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-20 14:42 [PATCH v3 0/5] gpio: expose line bias flags to userspace Kent Gibson
2019-10-20 14:42 ` [PATCH v3 1/5] gpio: expose pull-up/pull-down line " Kent Gibson
2019-10-20 14:42 ` [PATCH v3 2/5] gpiolib: add support for pull up/down to lineevent_create Kent Gibson
2019-10-20 14:42 ` [PATCH v3 3/5] gpio: mockup: add set_config to support pull up/down Kent Gibson
2019-10-20 14:42 ` [PATCH v3 4/5] gpiolib: add support for disabling line bias Kent Gibson
2019-10-20 14:42 ` Kent Gibson [this message]
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