linux-kernel - [PATCH v2 17/18] tools: gpio: add debounce support to gpio-event-mon

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Message-Id: <20200725041955.9985-18-warthog618@gmail.com>
Date:   Sat, 25 Jul 2020 12:19:54 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        bgolaszewski@...libre.com, linus.walleij@...aro.org
Cc:     Kent Gibson <warthog618@...il.com>
Subject: [PATCH v2 17/18] tools: gpio: add debounce support to gpio-event-mon

Add support for debouncing monitored lines to gpio-event-mon.

Signed-off-by: Kent Gibson <warthog618@...il.com>
---
 tools/gpio/gpio-event-mon.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/tools/gpio/gpio-event-mon.c b/tools/gpio/gpio-event-mon.c
index 5da980f78881..b64427d78942 100644
--- a/tools/gpio/gpio-event-mon.c
+++ b/tools/gpio/gpio-event-mon.c
@@ -129,11 +129,12 @@ void print_usage(void)
 		"  -s         Set line as open source\n"
 		"  -r         Listen for rising edges\n"
 		"  -f         Listen for falling edges\n"
+		"  -b <n>     Debounce the line with period n microseconds\n"
 		" [-c <n>]    Do <n> loops (optional, infinite loop if not stated)\n"
 		"  -?         This helptext\n"
 		"\n"
 		"Example:\n"
-		"gpio-event-mon -n gpiochip0 -o 4 -r -f\n"
+		"gpio-event-mon -n gpiochip0 -o 4 -r -f -b 10000\n"
 	);
 }
 
@@ -147,11 +148,11 @@ int main(int argc, char **argv)
 	unsigned int line = -1;
 	unsigned int loops = 0;
 	struct gpioline_config config;
-	int c;
+	int c, attr;
 
 	memset(&config, 0, sizeof(config));
 	config.flags = GPIOLINE_FLAG_V2_INPUT;
-	while ((c = getopt(argc, argv, "c:n:o:dsrf?")) != -1) {
+	while ((c = getopt(argc, argv, "c:n:o:b:dsrf?")) != -1) {
 		switch (c) {
 		case 'c':
 			loops = strtoul(optarg, NULL, 10);
@@ -162,6 +163,14 @@ int main(int argc, char **argv)
 		case 'o':
 			line = strtoul(optarg, NULL, 10);
 			break;
+		case 'b':
+			attr = config.num_attrs;
+			config.num_attrs++;
+			gpiotools_set_bit(config.attrs[attr].mask, 0);
+			config.attrs[attr].attr.id = GPIOLINE_ATTR_ID_DEBOUNCE;
+			config.attrs[attr].attr.debounce_period =
+				strtoul(optarg, NULL, 10);
+			break;
 		case 'd':
 			config.flags |= GPIOLINE_FLAG_V2_OPEN_DRAIN;
 			break;
-- 
2.27.0