[PATCH v4 20/20] tools: gpio: add debounce support to gpio-event-mon

[Kent Gibson]

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

Signed-off-by: Kent Gibson <warthog...@gmail.com>
---
 tools/gpio/gpio-event-mon.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/tools/gpio/gpio-event-mon.c b/tools/gpio/gpio-event-mon.c
index e50bb107ea3a..bd5ea3cc6e85 100644
--- a/tools/gpio/gpio-event-mon.c
+++ b/tools/gpio/gpio-event-mon.c
@@ -148,11 +148,12 @@ 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"
        );
 }
 
@@ -167,11 +168,12 @@ int main(int argc, char **argv)
        unsigned int num_lines = 0;
        unsigned int loops = 0;
        struct gpio_v2_line_config config;
-       int c;
+       int c, attr, i;
+       unsigned long debounce_period = 0;
 
        memset(&config, 0, sizeof(config));
        config.flags = GPIO_V2_LINE_FLAG_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);
@@ -187,6 +189,9 @@ int main(int argc, char **argv)
                        lines[num_lines] = strtoul(optarg, NULL, 10);
                        num_lines++;
                        break;
+               case 'b':
+                       debounce_period = strtoul(optarg, NULL, 10);
+                       break;
                case 'd':
                        config.flags |= GPIO_V2_LINE_FLAG_OPEN_DRAIN;
                        break;
@@ -205,6 +210,15 @@ int main(int argc, char **argv)
                }
        }
 
+       if (debounce_period) {
+               attr = config.num_attrs;
+               config.num_attrs++;
+               for (i = 0; i < num_lines; i++)
+                       gpiotools_set_bit(&config.attrs[attr].mask, i);
+               config.attrs[attr].attr.id = GPIO_V2_LINE_ATTR_ID_DEBOUNCE;
+               config.attrs[attr].attr.debounce_period = debounce_period;
+       }
+
        if (!device_name || num_lines == 0) {
                print_usage();
                return -1;
-- 
2.28.0