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path: root/drivers/input/keyboard/gpio_keys.c
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Diffstat (limited to 'drivers/input/keyboard/gpio_keys.c')
-rw-r--r--drivers/input/keyboard/gpio_keys.c114
1 files changed, 57 insertions, 57 deletions
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index d4dd78a7d56b..883d6aed5b9a 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -35,9 +35,13 @@
struct gpio_button_data {
const struct gpio_keys_button *button;
struct input_dev *input;
- struct timer_list timer;
- struct work_struct work;
- unsigned int timer_debounce; /* in msecs */
+
+ struct timer_list release_timer;
+ unsigned int release_delay; /* in msecs, for IRQ-only buttons */
+
+ struct delayed_work work;
+ unsigned int software_debounce; /* in msecs, for GPIO-driven buttons */
+
unsigned int irq;
spinlock_t lock;
bool disabled;
@@ -116,11 +120,14 @@ static void gpio_keys_disable_button(struct gpio_button_data *bdata)
{
if (!bdata->disabled) {
/*
- * Disable IRQ and possible debouncing timer.
+ * Disable IRQ and associated timer/work structure.
*/
disable_irq(bdata->irq);
- if (bdata->timer_debounce)
- del_timer_sync(&bdata->timer);
+
+ if (gpio_is_valid(bdata->button->gpio))
+ cancel_delayed_work_sync(&bdata->work);
+ else
+ del_timer_sync(&bdata->release_timer);
bdata->disabled = true;
}
@@ -343,7 +350,7 @@ static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
static void gpio_keys_gpio_work_func(struct work_struct *work)
{
struct gpio_button_data *bdata =
- container_of(work, struct gpio_button_data, work);
+ container_of(work, struct gpio_button_data, work.work);
gpio_keys_gpio_report_event(bdata);
@@ -351,13 +358,6 @@ static void gpio_keys_gpio_work_func(struct work_struct *work)
pm_relax(bdata->input->dev.parent);
}
-static void gpio_keys_gpio_timer(unsigned long _data)
-{
- struct gpio_button_data *bdata = (struct gpio_button_data *)_data;
-
- schedule_work(&bdata->work);
-}
-
static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
{
struct gpio_button_data *bdata = dev_id;
@@ -366,11 +366,10 @@ static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
if (bdata->button->wakeup)
pm_stay_awake(bdata->input->dev.parent);
- if (bdata->timer_debounce)
- mod_timer(&bdata->timer,
- jiffies + msecs_to_jiffies(bdata->timer_debounce));
- else
- schedule_work(&bdata->work);
+
+ mod_delayed_work(system_wq,
+ &bdata->work,
+ msecs_to_jiffies(bdata->software_debounce));
return IRQ_HANDLED;
}
@@ -408,7 +407,7 @@ static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
input_event(input, EV_KEY, button->code, 1);
input_sync(input);
- if (!bdata->timer_debounce) {
+ if (!bdata->release_delay) {
input_event(input, EV_KEY, button->code, 0);
input_sync(input);
goto out;
@@ -417,9 +416,9 @@ static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
bdata->key_pressed = true;
}
- if (bdata->timer_debounce)
- mod_timer(&bdata->timer,
- jiffies + msecs_to_jiffies(bdata->timer_debounce));
+ if (bdata->release_delay)
+ mod_timer(&bdata->release_timer,
+ jiffies + msecs_to_jiffies(bdata->release_delay));
out:
spin_unlock_irqrestore(&bdata->lock, flags);
return IRQ_HANDLED;
@@ -429,10 +428,10 @@ static void gpio_keys_quiesce_key(void *data)
{
struct gpio_button_data *bdata = data;
- if (bdata->timer_debounce)
- del_timer_sync(&bdata->timer);
-
- cancel_work_sync(&bdata->work);
+ if (gpio_is_valid(bdata->button->gpio))
+ cancel_delayed_work_sync(&bdata->work);
+ else
+ del_timer_sync(&bdata->release_timer);
}
static int gpio_keys_setup_key(struct platform_device *pdev,
@@ -466,23 +465,25 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
button->debounce_interval * 1000);
/* use timer if gpiolib doesn't provide debounce */
if (error < 0)
- bdata->timer_debounce =
+ bdata->software_debounce =
button->debounce_interval;
}
- irq = gpio_to_irq(button->gpio);
- if (irq < 0) {
- error = irq;
- dev_err(dev,
- "Unable to get irq number for GPIO %d, error %d\n",
- button->gpio, error);
- return error;
+ if (button->irq) {
+ bdata->irq = button->irq;
+ } else {
+ irq = gpio_to_irq(button->gpio);
+ if (irq < 0) {
+ error = irq;
+ dev_err(dev,
+ "Unable to get irq number for GPIO %d, error %d\n",
+ button->gpio, error);
+ return error;
+ }
+ bdata->irq = irq;
}
- bdata->irq = irq;
- INIT_WORK(&bdata->work, gpio_keys_gpio_work_func);
- setup_timer(&bdata->timer,
- gpio_keys_gpio_timer, (unsigned long)bdata);
+ INIT_DELAYED_WORK(&bdata->work, gpio_keys_gpio_work_func);
isr = gpio_keys_gpio_isr;
irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
@@ -499,8 +500,8 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
return -EINVAL;
}
- bdata->timer_debounce = button->debounce_interval;
- setup_timer(&bdata->timer,
+ bdata->release_delay = button->debounce_interval;
+ setup_timer(&bdata->release_timer,
gpio_keys_irq_timer, (unsigned long)bdata);
isr = gpio_keys_irq_isr;
@@ -510,7 +511,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
input_set_capability(input, button->type ?: EV_KEY, button->code);
/*
- * Install custom action to cancel debounce timer and
+ * Install custom action to cancel release timer and
* workqueue item.
*/
error = devm_add_action(&pdev->dev, gpio_keys_quiesce_key, bdata);
@@ -618,33 +619,30 @@ gpio_keys_get_devtree_pdata(struct device *dev)
i = 0;
for_each_child_of_node(node, pp) {
- int gpio = -1;
enum of_gpio_flags flags;
button = &pdata->buttons[i++];
- if (!of_find_property(pp, "gpios", NULL)) {
- button->irq = irq_of_parse_and_map(pp, 0);
- if (button->irq == 0) {
- i--;
- pdata->nbuttons--;
- dev_warn(dev, "Found button without gpios or irqs\n");
- continue;
- }
- } else {
- gpio = of_get_gpio_flags(pp, 0, &flags);
- if (gpio < 0) {
- error = gpio;
+ button->gpio = of_get_gpio_flags(pp, 0, &flags);
+ if (button->gpio < 0) {
+ error = button->gpio;
+ if (error != -ENOENT) {
if (error != -EPROBE_DEFER)
dev_err(dev,
"Failed to get gpio flags, error: %d\n",
error);
return ERR_PTR(error);
}
+ } else {
+ button->active_low = flags & OF_GPIO_ACTIVE_LOW;
}
- button->gpio = gpio;
- button->active_low = flags & OF_GPIO_ACTIVE_LOW;
+ button->irq = irq_of_parse_and_map(pp, 0);
+
+ if (!gpio_is_valid(button->gpio) && !button->irq) {
+ dev_err(dev, "Found button without gpios or irqs\n");
+ return ERR_PTR(-EINVAL);
+ }
if (of_property_read_u32(pp, "linux,code", &button->code)) {
dev_err(dev, "Button without keycode: 0x%x\n",
@@ -659,6 +657,8 @@ gpio_keys_get_devtree_pdata(struct device *dev)
button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
+ button->can_disable = !!of_get_property(pp, "linux,can-disable", NULL);
+
if (of_property_read_u32(pp, "debounce-interval",
&button->debounce_interval))
button->debounce_interval = 5;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.