[v3,2/3] input: gpio-keys: Use hrtimer for release timer

Commit Message

Paul Cercueil March 7, 2021, 10:22 p.m. UTC

Dealing with input, timing is important; if the button should be
released in one millisecond, then it should be done in one millisecond
and not a hundred milliseconds.

Therefore, the standard timer API is not really suitable for this task.

Convert the gpio-keys driver to use a hrtimer instead of the standard
timer to address this issue.

Note that by using a hard IRQ for the hrtimer callback, we can get rid
of the spin_lock_irqsave() and spin_unlock_irqrestore().

Signed-off-by: Paul Cercueil <[e-mail]>
---

Notes:
    v2-v3: No change

 drivers/input/keyboard/gpio_keys.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

Comments

Dmitry Torokhov March 23, 2021, 9:33 p.m. UTC | #1

On Sun, Mar 07, 2021 at 10:22:39PM +0000, Paul Cercueil wrote:
> Dealing with input, timing is important; if the button should be
> released in one millisecond, then it should be done in one millisecond
> and not a hundred milliseconds.
> 
> Therefore, the standard timer API is not really suitable for this task.
> 
> Convert the gpio-keys driver to use a hrtimer instead of the standard
> timer to address this issue.
> 
> Note that by using a hard IRQ for the hrtimer callback, we can get rid
> of the spin_lock_irqsave() and spin_unlock_irqrestore().
> 
> Signed-off-by: Paul Cercueil <[e-mail]>

Applied, thank you.

Patch

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 7fcb2c35c5cc..4b92f49decef 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -8,6 +8,7 @@ 
 
 #include <linux/module.h>
 
+#include <linux/hrtimer.h>
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/interrupt.h>
@@ -36,7 +37,7 @@  struct gpio_button_data {
 
 	unsigned short *code;
 
-	struct timer_list release_timer;
+	struct hrtimer release_timer;
 	unsigned int release_delay;	/* in msecs, for IRQ-only buttons */
 
 	struct delayed_work work;
@@ -146,7 +147,7 @@  static void gpio_keys_disable_button(struct gpio_button_data *bdata)
 		if (bdata->gpiod)
 			cancel_delayed_work_sync(&bdata->work);
 		else
-			del_timer_sync(&bdata->release_timer);
+			hrtimer_cancel(&bdata->release_timer);
 
 		bdata->disabled = true;
 	}
@@ -415,19 +416,20 @@  static irqreturn_t gpio_keys_gpio_isr(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static void gpio_keys_irq_timer(struct timer_list *t)
+static enum hrtimer_restart gpio_keys_irq_timer(struct hrtimer *t)
 {
-	struct gpio_button_data *bdata = from_timer(bdata, t, release_timer);
+	struct gpio_button_data *bdata = container_of(t,
+						      struct gpio_button_data,
+						      release_timer);
 	struct input_dev *input = bdata->input;
-	unsigned long flags;
 
-	spin_lock_irqsave(&bdata->lock, flags);
 	if (bdata->key_pressed) {
 		input_event(input, EV_KEY, *bdata->code, 0);
 		input_sync(input);
 		bdata->key_pressed = false;
 	}
-	spin_unlock_irqrestore(&bdata->lock, flags);
+
+	return HRTIMER_NORESTART;
 }
 
 static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
@@ -457,8 +459,9 @@  static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
 	}
 
 	if (bdata->release_delay)
-		mod_timer(&bdata->release_timer,
-			jiffies + msecs_to_jiffies(bdata->release_delay));
+		hrtimer_start(&bdata->release_timer,
+			      ms_to_ktime(bdata->release_delay),
+			      HRTIMER_MODE_REL_HARD);
 out:
 	spin_unlock_irqrestore(&bdata->lock, flags);
 	return IRQ_HANDLED;
@@ -471,7 +474,7 @@  static void gpio_keys_quiesce_key(void *data)
 	if (bdata->gpiod)
 		cancel_delayed_work_sync(&bdata->work);
 	else
-		del_timer_sync(&bdata->release_timer);
+		hrtimer_cancel(&bdata->release_timer);
 }
 
 static int gpio_keys_setup_key(struct platform_device *pdev,
@@ -595,7 +598,9 @@  static int gpio_keys_setup_key(struct platform_device *pdev,
 		}
 
 		bdata->release_delay = button->debounce_interval;
-		timer_setup(&bdata->release_timer, gpio_keys_irq_timer, 0);
+		hrtimer_init(&bdata->release_timer,
+			     CLOCK_REALTIME, HRTIMER_MODE_REL_HARD);
+		bdata->release_timer.function = gpio_keys_irq_timer;
 
 		isr = gpio_keys_irq_isr;
 		irqflags = 0;