From 97d86e07b71643086a6d22a60efae2fb095fa82a Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Fri, 14 Nov 2014 15:57:09 -0800 Subject: Input: gpio_keys - allow separating gpio and irq in device tree This change allows specify interrupt for buttons separately form gpio, potentially allowing to form several "clusters" of buttons on different interrupts. Button defined without both gpio and irq in device tree is a hared error instead of a warning now. Tested-by: Andy Shevchenko Reviewed-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/gpio_keys.c | 49 ++++++++++++++++++++------------------ 1 file changed, 26 insertions(+), 23 deletions(-) (limited to 'drivers/input/keyboard/gpio_keys.c') diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c index f44f05b70ee0..a5ece3ff19cb 100644 --- a/drivers/input/keyboard/gpio_keys.c +++ b/drivers/input/keyboard/gpio_keys.c @@ -470,15 +470,19 @@ static int gpio_keys_setup_key(struct platform_device *pdev, 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, @@ -618,33 +622,30 @@ 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 +660,8 @@ 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; -- cgit v1.2.3 From 8ed92556761e1f383d28215d6de92fe4ada35001 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Fri, 14 Nov 2014 17:32:01 -0800 Subject: 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(-) (limited to 'drivers/input/keyboard/gpio_keys.c') 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); -- cgit v1.2.3