From 40f805806dfb761650080ee008aeb96c012a0e03 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Mon, 21 Dec 2015 11:32:53 +0100
Subject: gpio: pcf857x: Be sure to clamp return value

As we want gpio_chip .get() calls to be able to return negative
error codes and propagate to drivers, we need to go over all
drivers and make sure their return values are clamped to [0,1].
We do this by using the ret = !!(val) design pattern.

Also start returning the error code if something fails, as the
end of the series augment the core to support this.

Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: George Cherian <george.cherian@ti.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index bf511c0..f64380a 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -154,7 +154,7 @@ static int pcf857x_get(struct gpio_chip *chip, unsigned offset)
 	int		value;
 
 	value = gpio->read(gpio->client);
-	return (value < 0) ? 0 : (value & (1 << offset));
+	return (value < 0) ? value : !!(value & (1 << offset));
 }
 
 static int pcf857x_output(struct gpio_chip *chip, unsigned offset, int value)
-- 
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