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gpioevents: add support for pull-down and floating input pins.

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The pin-mode (ft, pd, pu for floating, pull-down, pull-up) is
specified after the intr-config (no, eb, ef, er) for each pin.

Tested on my Raspberry Pi 1B.

PR:		268504
Approved by:	manu
MFC after:      1 week
This commit is contained in:
Rene Ladan 2022-12-21 22:24:11 +01:00
parent 702b53dd2a
commit 453db42291
1 changed files with 41 additions and 6 deletions
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47
tools/test/gpioevents/gpioevents.c
View file

@ -66,7 +66,7 @@ static void
usage() usage()
{ {
fprintf(stderr, "usage: %s [-f ctldev] [-m method] [-s] [-n] [-S] [-u]" fprintf(stderr, "usage: %s [-f ctldev] [-m method] [-s] [-n] [-S] [-u]"
"[-t timeout] [-d delay-usec] pin intr-config [pin intr-config ...]\n\n", "[-t timeout] [-d delay-usec] pin intr-config pin-mode [pin intr-config pin-mode ...]\n\n",
getprogname()); getprogname());
fprintf(stderr, " -d delay before each call to read/poll/select/etc\n"); fprintf(stderr, " -d delay before each call to read/poll/select/etc\n");
fprintf(stderr, " -n Non-blocking IO\n"); fprintf(stderr, " -n Non-blocking IO\n");
@ -85,7 +85,11 @@ usage()
fprintf(stderr, " no\t no interrupt\n"); fprintf(stderr, " no\t no interrupt\n");
fprintf(stderr, " er\t edge rising\n"); fprintf(stderr, " er\t edge rising\n");
fprintf(stderr, " ef\t edge falling\n"); fprintf(stderr, " ef\t edge falling\n");
fprintf(stderr, " eb\t edge both\n"); fprintf(stderr, " eb\t edge both\n\n");
fprintf(stderr, "Possible options for pin-mode:\n\n");
fprintf(stderr, " ft\t floating\n");
fprintf(stderr, " pd\t pull-down\n");
fprintf(stderr, " pu\t pull-up\n");
} }
static void static void
@ -539,8 +543,15 @@ main(int argc, char *argv[])
return EXIT_FAILURE; return EXIT_FAILURE;
} }
if (argc % 2 == 1) { if (argc == 1) {
fprintf(stderr, "%s: Invalid number of pin intr-conf pairs.\n", fprintf(stderr, "%s: No trigger type specified.\n",
getprogname());
usage();
return EXIT_FAILURE;
}
if (argc % 3 != 0) {
fprintf(stderr, "%s: Invalid number of (pin intr-conf mode) triplets.\n",
getprogname()); getprogname());
usage(); usage();
return EXIT_FAILURE; return EXIT_FAILURE;
@ -567,7 +578,7 @@ main(int argc, char *argv[])
err(EXIT_FAILURE, "cannot set O_NONBLOCK on %s", file); err(EXIT_FAILURE, "cannot set O_NONBLOCK on %s", file);
} }
for (int i = 0; i <= argc - 2; i += 2) { for (int i = 0; i <= argc - 3; i += 3) {
errno = 0; errno = 0;
pin_config.g_pin = strtol(argv[i], NULL, 10); pin_config.g_pin = strtol(argv[i], NULL, 10);
@ -604,7 +615,31 @@ main(int argc, char *argv[])
return EXIT_FAILURE; return EXIT_FAILURE;
} }
pin_config.g_flags |= GPIO_PIN_INPUT | GPIO_PIN_PULLUP; if (strnlen(argv[i + 2], 2) < 2) {
fprintf(stderr, "%s: Invalid pin mode (argument "
"too short).\n", getprogname());
usage();
return EXIT_FAILURE;
}
switch((argv[i + 2][0] << 8) + argv[i + 2][1]) {
case ('f' << 8) + 't':
/* no changes to pin_config */
break;
case ('p' << 8) + 'd':
pin_config.g_flags |= GPIO_PIN_PULLDOWN;
break;
case ('p' << 8) + 'u':
pin_config.g_flags |= GPIO_PIN_PULLUP;
break;
default:
fprintf(stderr, "%s: Invalid pin mode.\n",
getprogname());
usage();
return EXIT_FAILURE;
}
pin_config.g_flags |= GPIO_PIN_INPUT;
res = gpio_pin_set_flags(handle, &pin_config); res = gpio_pin_set_flags(handle, &pin_config);
if (res < 0) if (res < 0)