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Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-gpio.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index faddeac948db..c211222f5d0c 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -22,26 +22,22 @@
/**
* struct gpio_extcon_data - A simple GPIO-controlled extcon device state container.
* @edev: Extcon device.
- * @irq: Interrupt line for the external connector.
* @work: Work fired by the interrupt.
* @debounce_jiffies: Number of jiffies to wait for the GPIO to stabilize, from the debounce
* value.
* @gpiod: GPIO descriptor for this external connector.
* @extcon_id: The unique id of specific external connector.
* @debounce: Debounce time for GPIO IRQ in ms.
- * @irq_flags: IRQ Flags (e.g., IRQF_TRIGGER_LOW).
* @check_on_resume: Boolean describing whether to check the state of gpio
* while resuming from sleep.
*/
struct gpio_extcon_data {
struct extcon_dev *edev;
- int irq;
struct delayed_work work;
unsigned long debounce_jiffies;
struct gpio_desc *gpiod;
unsigned int extcon_id;
unsigned long debounce;
- unsigned long irq_flags;
bool check_on_resume;
};
@@ -69,6 +65,8 @@ static int gpio_extcon_probe(struct platform_device *pdev)
{
struct gpio_extcon_data *data;
struct device *dev = &pdev->dev;
+ unsigned long irq_flags;
+ int irq;
int ret;
data = devm_kzalloc(dev, sizeof(struct gpio_extcon_data), GFP_KERNEL);
@@ -82,15 +80,26 @@ static int gpio_extcon_probe(struct platform_device *pdev)
* developed to get the extcon id from device-tree or others.
* On later, it have to be solved.
*/
- if (!data->irq_flags || data->extcon_id > EXTCON_NONE)
+ if (data->extcon_id > EXTCON_NONE)
return -EINVAL;
data->gpiod = devm_gpiod_get(dev, "extcon", GPIOD_IN);
if (IS_ERR(data->gpiod))
return PTR_ERR(data->gpiod);
- data->irq = gpiod_to_irq(data->gpiod);
- if (data->irq <= 0)
- return data->irq;
+ irq = gpiod_to_irq(data->gpiod);
+ if (irq <= 0)
+ return irq;
+
+ /*
+ * It is unlikely that this is an acknowledged interrupt that goes
+ * away after handling, what we are looking for are falling edges
+ * if the signal is active low, and rising edges if the signal is
+ * active high.
+ */
+ if (gpiod_is_active_low(data->gpiod))
+ irq_flags = IRQF_TRIGGER_FALLING;
+ else
+ irq_flags = IRQF_TRIGGER_RISING;
/* Allocate the memory of extcon devie and register extcon device */
data->edev = devm_extcon_dev_allocate(dev, &data->extcon_id);
@@ -109,8 +118,8 @@ static int gpio_extcon_probe(struct platform_device *pdev)
* Request the interrupt of gpio to detect whether external connector
* is attached or detached.
*/
- ret = devm_request_any_context_irq(dev, data->irq,
- gpio_irq_handler, data->irq_flags,
+ ret = devm_request_any_context_irq(dev, irq,
+ gpio_irq_handler, irq_flags,
pdev->name, data);
if (ret < 0)
return ret;