Add support for specifying event actions to trigger wakeup when using
the gpio-keys input device as a wakeup source.
This would allow the device to configure when to wakeup the system. For
example a gpio-keys input device for pen insert, may only want to wakeup
the system when ejecting the pen.
Suggested-by: Brian Norris <briannorris@xxxxxxxxxxxx>
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
---
Changes in v3:
Adding more comments as Brian suggested.
Changes in v2:
Specify wakeup event action instead of irq trigger type as Brian
suggested.
drivers/input/keyboard/gpio_keys.c | 39 ++++++++++++++++++++++++++++++++++
include/linux/gpio_keys.h | 2 ++
include/uapi/linux/input-event-codes.h | 9 ++++++++
3 files changed, 50 insertions(+)
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 87e613dc33b8..607f3960c886 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -45,6 +45,8 @@ struct gpio_button_data {
unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
unsigned int irq;
+ unsigned int irq_trigger_type;
+ unsigned int wakeup_trigger_type;
spinlock_t lock;
bool disabled;
bool key_pressed;
@@ -540,6 +542,8 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
}
if (bdata->gpiod) {
+ int active_low = gpiod_is_active_low(bdata->gpiod);
+
if (button->debounce_interval) {
error = gpiod_set_debounce(bdata->gpiod,
button->debounce_interval * 1000);
@@ -568,6 +572,22 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
isr = gpio_keys_gpio_isr;
irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
+ switch (button->wakeup_event_action) {
+ case EV_ACT_ASSERTED:
+ bdata->wakeup_trigger_type = active_low ?
+ IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
+ break;
+ case EV_ACT_DEASSERTED:
+ bdata->wakeup_trigger_type = active_low ?
+ IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
+ break;
+ default:
+ /*
+ * For other cases, we are OK letting suspend/resume
+ * not reconfigure the trigger type.
+ */
+ break;
+ }
} else {
if (!button->irq) {
dev_err(dev, "Found button without gpio or irq\n");
@@ -586,6 +606,12 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
isr = gpio_keys_irq_isr;
irqflags = 0;
+
+ /*
+ * For IRQ buttons, the irq trigger type for press and release
+ * are the same. So we don't need to reconfigure the trigger
+ * type for wakeup.
+ */
}
bdata->code = &ddata->keymap[idx];
@@ -618,6 +644,8 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
return error;
}
+ bdata->irq_trigger_type = irq_get_trigger_type(bdata->irq);
+
return 0;
}
@@ -718,6 +746,9 @@ gpio_keys_get_devtree_pdata(struct device *dev)
/* legacy name */
fwnode_property_read_bool(child, "gpio-key,wakeup");
+ fwnode_property_read_u32(child, "wakeup-event-action",
+ &button->wakeup_event_action);
+
button->can_disable =
fwnode_property_read_bool(child, "linux,can-disable");
@@ -854,6 +885,10 @@ static int __maybe_unused gpio_keys_suspend(struct device *dev)
if (device_may_wakeup(dev)) {
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
+
+ if (bdata->button->wakeup && bdata->wakeup_trigger_type)
+ irq_set_irq_type(bdata->irq,
+ bdata->wakeup_trigger_type);
if (bdata->button->wakeup)
enable_irq_wake(bdata->irq);
bdata->suspended = true;
@@ -878,6 +913,10 @@ static int __maybe_unused gpio_keys_resume(struct device *dev)
if (device_may_wakeup(dev)) {
for (i = 0; i < ddata->pdata->nbuttons; i++) {
struct gpio_button_data *bdata = &ddata->data[i];
+
+ if (bdata->button->wakeup && bdata->wakeup_trigger_type)
+ irq_set_irq_type(bdata->irq,
+ bdata->irq_trigger_type);
if (bdata->button->wakeup)
disable_irq_wake(bdata->irq);
bdata->suspended = false;
diff --git a/include/linux/gpio_keys.h b/include/linux/gpio_keys.h
index d06bf77400f1..7160df54a6fe 100644
--- a/include/linux/gpio_keys.h
+++ b/include/linux/gpio_keys.h
@@ -13,6 +13,7 @@ struct device;
* @desc: label that will be attached to button's gpio
* @type: input event type (%EV_KEY, %EV_SW, %EV_ABS)
* @wakeup: configure the button as a wake-up source
+ * @wakeup_event_action: event action to trigger wakeup
* @debounce_interval: debounce ticks interval in msecs
* @can_disable: %true indicates that userspace is allowed to
* disable button via sysfs
@@ -26,6 +27,7 @@ struct gpio_keys_button {
const char *desc;
unsigned int type;
int wakeup;
+ int wakeup_event_action;
int debounce_interval;
bool can_disable;
int value;
diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
index 53fbae27b280..d7917b0bd438 100644
--- a/include/uapi/linux/input-event-codes.h
+++ b/include/uapi/linux/input-event-codes.h
@@ -32,6 +32,15 @@
#define INPUT_PROP_CNT (INPUT_PROP_MAX + 1)
/*
+ * Event action types
+ */
+#define EV_ACT_ANY 0x00 /* asserted or deasserted */
+#define EV_ACT_ASSERTED 0x01 /* asserted */
+#define EV_ACT_DEASSERTED 0x02 /* deasserted */
+#define EV_ACT_MAX 0x02
+#define EV_ACT_CNT (EV_ACT_MAX+1)
+
+/*
* Event types
*/
--
2.11.0
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