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authorJeffy Chen <jeffy.chen@rock-chips.com>2018-03-08 16:03:27 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2018-03-14 10:13:22 -0700
commit83fc580dcc2f0f36114477c4ac7adbe5c32329a3 (patch)
tree848ad4e17ccb5afa3e056de894955b4b6efd28d2 /drivers
parentInput: appletouch - use true and false for boolean values (diff)
downloadlinux-dev-83fc580dcc2f0f36114477c4ac7adbe5c32329a3.tar.xz
linux-dev-83fc580dcc2f0f36114477c4ac7adbe5c32329a3.zip
Input: gpio-keys - add support for wakeup event action
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@chromium.org> Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/keyboard/gpio_keys.c145
1 files changed, 131 insertions, 14 deletions
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 87e613dc33b8..052e37675086 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -30,6 +30,7 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/spinlock.h>
+#include <dt-bindings/input/gpio-keys.h>
struct gpio_button_data {
const struct gpio_keys_button *button;
@@ -45,6 +46,7 @@ struct gpio_button_data {
unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
unsigned int irq;
+ 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) {
+ bool active_low = gpiod_is_active_low(bdata->gpiod);
+
if (button->debounce_interval) {
error = gpiod_set_debounce(bdata->gpiod,
button->debounce_interval * 1000);
@@ -568,6 +572,24 @@ 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 ?
+ IRQ_TYPE_EDGE_FALLING : IRQ_TYPE_EDGE_RISING;
+ break;
+ case EV_ACT_DEASSERTED:
+ bdata->wakeup_trigger_type = active_low ?
+ IRQ_TYPE_EDGE_RISING : IRQ_TYPE_EDGE_FALLING;
+ break;
+ case EV_ACT_ANY:
+ /* fall through */
+ 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 +608,11 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
isr = gpio_keys_irq_isr;
irqflags = 0;
+
+ /*
+ * For IRQ buttons, there is no interrupt for release.
+ * So we don't need to reconfigure the trigger type for wakeup.
+ */
}
bdata->code = &ddata->keymap[idx];
@@ -718,6 +745,9 @@ 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");
@@ -845,19 +875,112 @@ static int gpio_keys_probe(struct platform_device *pdev)
return 0;
}
+static int __maybe_unused
+gpio_keys_button_enable_wakeup(struct gpio_button_data *bdata)
+{
+ int error;
+
+ error = enable_irq_wake(bdata->irq);
+ if (error) {
+ dev_err(bdata->input->dev.parent,
+ "failed to configure IRQ %d as wakeup source: %d\n",
+ bdata->irq, error);
+ return error;
+ }
+
+ if (bdata->wakeup_trigger_type) {
+ error = irq_set_irq_type(bdata->irq,
+ bdata->wakeup_trigger_type);
+ if (error) {
+ dev_err(bdata->input->dev.parent,
+ "failed to set wakeup trigger %08x for IRQ %d: %d\n",
+ bdata->wakeup_trigger_type, bdata->irq, error);
+ disable_irq_wake(bdata->irq);
+ return error;
+ }
+ }
+
+ return 0;
+}
+
+static void __maybe_unused
+gpio_keys_button_disable_wakeup(struct gpio_button_data *bdata)
+{
+ int error;
+
+ /*
+ * The trigger type is always both edges for gpio-based keys and we do
+ * not support changing wakeup trigger for interrupt-based keys.
+ */
+ if (bdata->wakeup_trigger_type) {
+ error = irq_set_irq_type(bdata->irq, IRQ_TYPE_EDGE_BOTH);
+ if (error)
+ dev_warn(bdata->input->dev.parent,
+ "failed to restore interrupt trigger for IRQ %d: %d\n",
+ bdata->irq, error);
+ }
+
+ error = disable_irq_wake(bdata->irq);
+ if (error)
+ dev_warn(bdata->input->dev.parent,
+ "failed to disable IRQ %d as wake source: %d\n",
+ bdata->irq, error);
+}
+
+static int __maybe_unused
+gpio_keys_enable_wakeup(struct gpio_keys_drvdata *ddata)
+{
+ struct gpio_button_data *bdata;
+ int error;
+ int i;
+
+ for (i = 0; i < ddata->pdata->nbuttons; i++) {
+ bdata = &ddata->data[i];
+ if (bdata->button->wakeup) {
+ error = gpio_keys_button_enable_wakeup(bdata);
+ if (error)
+ goto err_out;
+ }
+ bdata->suspended = true;
+ }
+
+ return 0;
+
+err_out:
+ while (i--) {
+ bdata = &ddata->data[i];
+ if (bdata->button->wakeup)
+ gpio_keys_button_disable_wakeup(bdata);
+ bdata->suspended = false;
+ }
+
+ return error;
+}
+
+static void __maybe_unused
+gpio_keys_disable_wakeup(struct gpio_keys_drvdata *ddata)
+{
+ struct gpio_button_data *bdata;
+ int i;
+
+ for (i = 0; i < ddata->pdata->nbuttons; i++) {
+ bdata = &ddata->data[i];
+ bdata->suspended = false;
+ if (irqd_is_wakeup_set(irq_get_irq_data(bdata->irq)))
+ gpio_keys_button_disable_wakeup(bdata);
+ }
+}
+
static int __maybe_unused gpio_keys_suspend(struct device *dev)
{
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
- int i;
+ int error;
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)
- enable_irq_wake(bdata->irq);
- bdata->suspended = true;
- }
+ error = gpio_keys_enable_wakeup(ddata);
+ if (error)
+ return error;
} else {
mutex_lock(&input->mutex);
if (input->users)
@@ -873,15 +996,9 @@ static int __maybe_unused gpio_keys_resume(struct device *dev)
struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev);
struct input_dev *input = ddata->input;
int error = 0;
- int i;
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)
- disable_irq_wake(bdata->irq);
- bdata->suspended = false;
- }
+ gpio_keys_disable_wakeup(ddata);
} else {
mutex_lock(&input->mutex);
if (input->users)