[v3,5/5] gpiolib: add support for biasing output lines
diff mbox series

Message ID 20191020144238.14080-6-warthog618@gmail.com
State New
Headers show
Series
  • gpio: expose line bias flags to userspace
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Commit Message

Kent Gibson Oct. 20, 2019, 2:42 p.m. UTC
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(-)

Patch
diff mbox series

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);