linux-kernel - [PATCH] input: gpio_keys: Don't report events on gpio failure

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Date:	Mon, 27 Jul 2015 18:50:04 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] input: gpio_keys: Don't report events on gpio failure

In the cases where the gpio chip fails to acquire the current state an
error is reported back to gpio_keys. This is currently interpreted as if
the line went high, which just confuses the developer.

This patch introduces an error print in this case and skipps the
reporting of a input event; to aid in debugging this issue.

Reported-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
---
 drivers/input/keyboard/gpio_keys.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index ddf4045de084..3ce3298ac09e 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -336,8 +336,14 @@ static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
 	const struct gpio_keys_button *button = bdata->button;
 	struct input_dev *input = bdata->input;
 	unsigned int type = button->type ?: EV_KEY;
-	int state = (gpio_get_value_cansleep(button->gpio) ? 1 : 0) ^ button->active_low;
+	int state = gpio_get_value_cansleep(button->gpio);
 
+	if (state < 0) {
+		dev_err(input->dev.parent, "failed to get gpio state\n");
+		return;
+	}
+
+	state = (state ? 1 : 0) ^ button->active_low;
 	if (type == EV_ABS) {
 		if (state)
 			input_event(input, type, button->code, button->value);
-- 
1.8.2.2

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