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Commit 5bfbdc9c authored by Guenter Roeck's avatar Guenter Roeck Committed by Chanwoo Choi
Browse files

extcon: gpio: Add support for active-low presence to detect pins 



This patch add 'gpio_active_low' field to 'struct gpio_extcon_data'
to check whether gpio active state is 1(high) or 0(low).

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent 7c0f6558

drivers/extcon/extcon-gpio.c

+4 −0
Original line number Diff line number Diff line
@@ -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;
@@ -49,6 +50,8 @@ static void gpio_extcon_work(struct work_struct *work) 
			     work);



	state = gpio_get_value(data->gpio);

	if (data->gpio_active_low)

		state = !state;

	extcon_set_state(&data->edev, state);

}
@@ -96,6 +99,7 @@ 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)

include/linux/extcon/extcon-gpio.h

+4 −0
Original line number Diff line number Diff line
@@ -27,6 +27,9 @@ 
 * struct gpio_extcon_platform_data - A simple GPIO-controlled extcon device.

 * @name:		The name of this GPIO extcon device.

 * @gpio:		Corresponding GPIO.

 * @gpio_active_low:	Boolean describing whether gpio active state is 1 or 0

 *			If true, low state of gpio means active.

 *			If false, high state of gpio means active.

 * @debounce:		Debounce time for GPIO IRQ in ms.

 * @irq_flags:		IRQ Flags (e.g., IRQF_TRIGGER_LOW).

 * @state_on:		print_state is overriden with state_on if attached.
@@ -41,6 +44,7 @@ 
struct gpio_extcon_platform_data {

	const char *name;

	unsigned gpio;

	bool gpio_active_low;

	unsigned long debounce;

	unsigned long irq_flags;