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tools: gpio: add debounce support to gpio-event-mon

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

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Kent Gibson 2020-09-28 08:28:07 +08:00 • committed by Bartosz Golaszewski
parent 62757c32d5
commit cf048e05b6
1 changed files with 17 additions and 3 deletions

20
tools/gpio/gpio-event-mon.c
View file

@ -148,11 +148,12 @@ void print_usage(void)
" -s Set line as open source\n" " -s Set line as open source\n"
" -r Listen for rising edges\n" " -r Listen for rising edges\n"
" -f Listen for falling 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" " [-c <n>] Do <n> loops (optional, infinite loop if not stated)\n"
" -? This helptext\n" " -? This helptext\n"
"\n" "\n"
"Example:\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 num_lines = 0;
unsigned int loops = 0; unsigned int loops = 0;
struct gpio_v2_line_config config; struct gpio_v2_line_config config;
int c; int c, attr, i;
unsigned long debounce_period_us = 0;
memset(&config, 0, sizeof(config)); memset(&config, 0, sizeof(config));
config.flags = GPIO_V2_LINE_FLAG_INPUT; 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) { switch (c) {
case 'c': case 'c':
loops = strtoul(optarg, NULL, 10); loops = strtoul(optarg, NULL, 10);
@ -187,6 +189,9 @@ int main(int argc, char **argv)
lines[num_lines] = strtoul(optarg, NULL, 10); lines[num_lines] = strtoul(optarg, NULL, 10);
num_lines++; num_lines++;
break; break;
case 'b':
debounce_period_us = strtoul(optarg, NULL, 10);
break;
case 'd': case 'd':
config.flags |= GPIO_V2_LINE_FLAG_OPEN_DRAIN; config.flags |= GPIO_V2_LINE_FLAG_OPEN_DRAIN;
break; break;
@ -205,6 +210,15 @@ int main(int argc, char **argv)
} }
} }
if (debounce_period_us) {
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_us = debounce_period_us;
}
if (!device_name || num_lines == 0) { if (!device_name || num_lines == 0) {
print_usage(); print_usage();
return -1; return -1;