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>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
index 4ce1aa7d29bd..4195810f87fe 100644
--- a/include/linux/extcon/extcon-gpio.h
+++ b/include/linux/extcon/extcon-gpio.h
@@ -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;