linux-kernel - [PATCH] pinctrl: vt8500: Ensure value reg is updated when setting direction

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Message-Id: <1398800520-18135-1-git-send-email-alchark@gmail.com>
Date:	Tue, 29 Apr 2014 23:42:00 +0400
From:	Alexey Charkov <alchark@...il.com>
To:	linus.walleij@...aro.org, linux@...sktech.co.nz,
	linux-kernel@...r.kernel.org
Cc:	Alexey Charkov <alchark@...il.com>
Subject: [PATCH] pinctrl: vt8500: Ensure value reg is updated when setting direction

Current code only touches the direction register when setting direction
to output, which breaks logic like

echo high > /sys/class/gpio/gpio0/direction

which is expected to also set the value. This patch also adds a call
to update the value register when setting direction to output.

Signed-off-by: Alexey Charkov <alchark@...il.com>
---
 drivers/pinctrl/vt8500/pinctrl-wmt.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/pinctrl/vt8500/pinctrl-wmt.c b/drivers/pinctrl/vt8500/pinctrl-wmt.c
index 9802b67..2c61281 100644
--- a/drivers/pinctrl/vt8500/pinctrl-wmt.c
+++ b/drivers/pinctrl/vt8500/pinctrl-wmt.c
@@ -523,17 +523,6 @@ static int wmt_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
 		return GPIOF_DIR_IN;
 }
 
-static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	return pinctrl_gpio_direction_input(chip->base + offset);
-}
-
-static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
-				     int value)
-{
-	return pinctrl_gpio_direction_output(chip->base + offset);
-}
-
 static int wmt_gpio_get_value(struct gpio_chip *chip, unsigned offset)
 {
 	struct wmt_pinctrl_data *data = dev_get_drvdata(chip->dev);
@@ -568,6 +557,18 @@ static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset,
 		wmt_clearbits(data, reg_data_out, BIT(bit));
 }
 
+static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_gpio_direction_input(chip->base + offset);
+}
+
+static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
+				     int value)
+{
+	wmt_gpio_set_value(chip, offset, value);
+	return pinctrl_gpio_direction_output(chip->base + offset);
+}
+
 static struct gpio_chip wmt_gpio_chip = {
 	.label = "gpio-wmt",
 	.owner = THIS_MODULE,
-- 
1.9.1

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