[PATCH v1 2/3] gpio: aggregator: Simplify isrange() by using get_option()

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

We already have a nice helper called get_option() which can be used
to validate the input format. Simplify isrange() by using it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/gpio/gpio-aggregator.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index 5be166e73381..de9ae622ca23 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -64,30 +64,17 @@ static char *get_arg(char **args)
 
 static bool isrange(const char *s)
 {
-	size_t n;
+	char **args = (char **)&s;
+	int dummy;
+	int res;
 
-	if (IS_ERR_OR_NULL(s))
+	if (IS_ERR_OR_NULL(s) || *s == '\0')
 		return false;
 
-	while (1) {
-		n = strspn(s, "0123456789");
-		if (!n)
-			return false;
-
-		s += n;
-
-		switch (*s++) {
-		case '\0':
-			return true;
-
-		case '-':
-		case ',':
-			break;
-
-		default:
-			return false;
-		}
-	}
+	do {
+		res = get_option(args, &dummy);
+	} while (res);
+	return **args == '\0';
 }
 
 static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
-- 
2.27.0