From 8ed92556761e1f383d28215d6de92fe4ada35001 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Fri, 14 Nov 2014 17:32:01 -0800 Subject: [PATCH] Input: gpio_keys - replace timer and workqueue with delayed workqueue We do not need to roll our own implementation of delayed work now that we have proper implementation of mod_delayed_work. For interrupt-only driven buttons we retain the timer, but we rename it to release_timer to better reflect its purpose. Tested-by: Andy Shevchenko Reviewed-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/gpio_keys.c | 65 ++++++++++++++---------------- 1 file changed, 31 insertions(+), 34 deletions(-) diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c index a5ece3ff19cb..eefd976ab4eb 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, @@ -466,7 +465,7 @@ 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; } @@ -484,9 +483,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev, 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; @@ -503,8 +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; @@ -514,7 +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); -- 2.20.1