[PATCH libgpiod-v2] gpioinfo: Show edge detection and debounce period if enabled

[Ben Hutchings <ben.hutchings@mind.be>]

gpioinfo shows most settings for each GPIO line, but currently misses
edge detection and debouncing.

* If edge detection is enabled, report it as an additional flag
* If debouncing is enabled, report the duration

Signed-off-by: Ben Hutchings <ben.hutchings@mind.be>
---
 tools/gpioinfo.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/gpioinfo.c b/tools/gpioinfo.c
index cd2b9e4..ed0018c 100644
--- a/tools/gpioinfo.c
+++ b/tools/gpioinfo.c
@@ -44,6 +44,21 @@ static bool line_drive_is_open_source(struct gpiod_line_info *info)
 	return gpiod_line_info_get_drive(info) == GPIOD_LINE_DRIVE_OPEN_SOURCE;
 }
 
+static bool edge_detection_is_rising(struct gpiod_line_info *info)
+{
+	return gpiod_line_info_get_edge_detection(info) == GPIOD_LINE_EDGE_RISING;
+}
+
+static bool edge_detection_is_falling(struct gpiod_line_info *info)
+{
+	return gpiod_line_info_get_edge_detection(info) == GPIOD_LINE_EDGE_FALLING;
+}
+
+static bool edge_detection_is_both(struct gpiod_line_info *info)
+{
+	return gpiod_line_info_get_edge_detection(info) == GPIOD_LINE_EDGE_BOTH;
+}
+
 static const struct flag flags[] = {
 	{
 		.name = "used",
@@ -69,6 +84,18 @@ static const struct flag flags[] = {
 		.name = "bias-disabled",
 		.is_set = line_bias_is_disabled,
 	},
+	{
+		.name = "edge-rising",
+		.is_set = edge_detection_is_rising,
+	},
+	{
+		.name = "edge-failling",
+		.is_set = edge_detection_is_falling,
+	},
+	{
+		.name = "edge-both",
+		.is_set = edge_detection_is_both,
+	},
 };
 
 static const struct option longopts[] = {
@@ -129,6 +156,7 @@ static void list_lines(struct gpiod_chip *chip)
 	const char *name, *consumer;
 	unsigned int i, offset;
 	int direction;
+	unsigned long debounce_period;
 
 	printf("%s - %u lines:\n",
 	       gpiod_chip_get_name(chip), gpiod_chip_get_num_lines(chip));
@@ -142,6 +170,8 @@ static void list_lines(struct gpiod_chip *chip)
 		consumer = gpiod_line_info_get_consumer(info);
 		direction = gpiod_line_info_get_direction(info);
 		active_low = gpiod_line_info_is_active_low(info);
+		debounce_period = gpiod_line_info_is_debounced(info) ?
+			gpiod_line_info_get_debounce_period(info) : 0;
 
 		of = false;
 
@@ -166,6 +196,9 @@ static void list_lines(struct gpiod_chip *chip)
 		prinfo(&of, 13, "%s ",
 		       active_low ? "active-low" : "active-high");
 
+		if (debounce_period)
+			printf("debounce=%lu ", debounce_period);
+
 		flag_printed = false;
 		for (i = 0; i < ARRAY_SIZE(flags); i++) {
 			if (flags[i].is_set(info)) {
-- 
2.20.1