[PATCH 2/2] selftests: watchdog: Add command line option to show watchdog_info

[Eugeniu Rosca]

From: "George G. Davis" <george_davis@xxxxxxxxxx>

A side of affect of commit "selftests: watchdog: Add optional file
argument" is that arbitrary files may be opened for watchdog testing, e.g.
/dev/null. To prevent watchdog-test from operating on non-watchdog device
files, commit "selftests: watchdog: Validate optional file argument" was
added to validate that a file is indeed a watchdog device via an
ioctl(WDIOC_GETSUPPORT) call. Since the watchdog_info is available as a
result of the ioctl(WDIOC_GETSUPPORT) call, add a command line option to
show the watchdog_info.

Suggested-by: Eugeniu Rosca <erosca@xxxxxxxxxxxxxx>
Signed-off-by: George G. Davis <george_davis@xxxxxxxxxx>
Signed-off-by: Eugeniu Rosca <erosca@xxxxxxxxxxxxxx>
---
v1: Applied/tested on commit ce54eab71e210f ("kunit: fix failure to build without printk") of 
    https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=next

 tools/testing/selftests/watchdog/watchdog-test.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
index 6ed822dc2222..f45e510500c0 100644
--- a/tools/testing/selftests/watchdog/watchdog-test.c
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -19,7 +19,7 @@
 
 int fd;
 const char v = 'V';
-static const char sopts[] = "bdehp:t:Tn:NLf:";
+static const char sopts[] = "bdehp:t:Tn:NLf:i";
 static const struct option lopts[] = {
 	{"bootstatus",          no_argument, NULL, 'b'},
 	{"disable",             no_argument, NULL, 'd'},
@@ -32,6 +32,7 @@ static const struct option lopts[] = {
 	{"getpretimeout",       no_argument, NULL, 'N'},
 	{"gettimeleft",		no_argument, NULL, 'L'},
 	{"file",          required_argument, NULL, 'f'},
+	{"info",		no_argument, NULL, 'i'},
 	{NULL,                  no_argument, NULL, 0x0}
 };
 
@@ -72,6 +73,7 @@ static void usage(char *progname)
 	printf("Usage: %s [options]\n", progname);
 	printf(" -f, --file\t\tOpen watchdog device file\n");
 	printf("\t\t\tDefault is /dev/watchdog\n");
+	printf(" -i, --info\t\tShow watchdog_info\n");
 	printf(" -b, --bootstatus\tGet last boot status (Watchdog/POR)\n");
 	printf(" -d, --disable\t\tTurn off the watchdog timer\n");
 	printf(" -e, --enable\t\tTurn on the watchdog timer\n");
@@ -216,6 +218,18 @@ int main(int argc, char *argv[])
 		case 'f':
 			/* Handled above */
 			break;
+		case 'i':
+			/*
+			 * watchdog_info was obtained as part of file open
+			 * validation. So we just show it here.
+			 */
+			oneshot = 1;
+			printf("watchdog_info:\n");
+			printf(" identity:\t\t%s\n", info.identity);
+			printf(" firmware_version:\t%u\n",
+			       info.firmware_version);
+			printf(" options:\t\t%08x\n", info.options);
+			break;
 
 		default:
 			usage(argv[0]);
-- 
2.23.0