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

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
...@@ -34,6 +34,7 @@ ...@@ -34,6 +34,7 @@
struct gpio_extcon_data { struct gpio_extcon_data {
struct extcon_dev edev; struct extcon_dev edev;
unsigned gpio; unsigned gpio;
bool gpio_active_low;
const char *state_on; const char *state_on;
const char *state_off; const char *state_off;
int irq; int irq;
...@@ -49,6 +50,8 @@ static void gpio_extcon_work(struct work_struct *work) ...@@ -49,6 +50,8 @@ static void gpio_extcon_work(struct work_struct *work)
work); work);
state = gpio_get_value(data->gpio); state = gpio_get_value(data->gpio);
if (data->gpio_active_low)
state = !state;
extcon_set_state(&data->edev, state); extcon_set_state(&data->edev, state);
} }
...@@ -96,6 +99,7 @@ static int gpio_extcon_probe(struct platform_device *pdev) ...@@ -96,6 +99,7 @@ static int gpio_extcon_probe(struct platform_device *pdev)
extcon_data->edev.name = pdata->name; extcon_data->edev.name = pdata->name;
extcon_data->gpio = pdata->gpio; extcon_data->gpio = pdata->gpio;
extcon_data->gpio_active_low = pdata->gpio_active_low;
extcon_data->state_on = pdata->state_on; extcon_data->state_on = pdata->state_on;
extcon_data->state_off = pdata->state_off; extcon_data->state_off = pdata->state_off;
if (pdata->state_on && pdata->state_off) if (pdata->state_on && pdata->state_off)
......
...@@ -27,6 +27,9 @@ ...@@ -27,6 +27,9 @@
* struct gpio_extcon_platform_data - A simple GPIO-controlled extcon device. * struct gpio_extcon_platform_data - A simple GPIO-controlled extcon device.
* @name: The name of this GPIO extcon device. * @name: The name of this GPIO extcon device.
* @gpio: Corresponding GPIO. * @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. * @debounce: Debounce time for GPIO IRQ in ms.
* @irq_flags: IRQ Flags (e.g., IRQF_TRIGGER_LOW). * @irq_flags: IRQ Flags (e.g., IRQF_TRIGGER_LOW).
* @state_on: print_state is overriden with state_on if attached. * @state_on: print_state is overriden with state_on if attached.
...@@ -41,6 +44,7 @@ ...@@ -41,6 +44,7 @@
struct gpio_extcon_platform_data { struct gpio_extcon_platform_data {
const char *name; const char *name;
unsigned gpio; unsigned gpio;
bool gpio_active_low;
unsigned long debounce; unsigned long debounce;
unsigned long irq_flags; unsigned long irq_flags;
......
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