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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: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
hifive-unleashed-5.1
Guenter Roeck 2013-09-12 08:49:54 +09:00 committed by Chanwoo Choi
parent 7c0f6558f8
commit 5bfbdc9caa
2 changed files with 8 additions and 0 deletions
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4
drivers/extcon/extcon-gpio.c
View File

@ -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)

4
include/linux/extcon/extcon-gpio.h
View File

@ -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;