linux-kernel - [PATCH 3/6] extcon-gpio: Add support for active-low presence detect pins

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Date:	Thu, 29 Aug 2013 21:29:35 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	devicetree@...r.kernel.org, Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Grant Likely <grant.likely@...aro.org>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 3/6] extcon-gpio: Add support for active-low presence detect pins

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/extcon/extcon-gpio.c       |    4 +++-
 include/linux/extcon/extcon-gpio.h |    1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index 973600e..d4e3c89 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -34,6 +34,7 @@
 struct gpio_extcon_data {
 	struct extcon_dev edev;
 	unsigned gpio;
+	bool gpio_active_low;
 	const char *state_on;
 	const char *state_off;
 	int irq;
@@ -48,7 +49,7 @@ static void gpio_extcon_work(struct work_struct *work)
 		container_of(to_delayed_work(work), struct gpio_extcon_data,
 			     work);
 
-	state = gpio_get_value(data->gpio);
+	state = gpio_get_value(data->gpio) ^ data->gpio_active_low;
 	extcon_set_state(&data->edev, state);
 }
 
@@ -96,6 +97,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
 
 	extcon_data->edev.name = pdata->name;
 	extcon_data->gpio = pdata->gpio;
+	extcon_data->gpio_active_low = pdata->gpio_active_low;
 	extcon_data->state_on = pdata->state_on;
 	extcon_data->state_off = pdata->state_off;
 	if (pdata->state_on && pdata->state_off)
diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
index 2d8307f..1613899 100644
--- a/include/linux/extcon/extcon-gpio.h
+++ b/include/linux/extcon/extcon-gpio.h
@@ -41,6 +41,7 @@
 struct gpio_extcon_platform_data {
 	const char *name;
 	unsigned gpio;
+	bool gpio_active_low;
 	unsigned long debounce;
 	unsigned long irq_flags;
 
-- 
1.7.9.7

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