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Input: gpio-keys debouncing support

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Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Baryshkov 2008-05-07 16:30:15 -04:00 committed by Dmitry Torokhov
parent 885c316d77
commit a33466e312
2 changed files with 70 additions and 20 deletions
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89
drivers/input/keyboard/gpio_keys.c
View file

@ -26,23 +26,54 @@
#include <asm/gpio.h>
struct gpio_button_data {
struct gpio_keys_button *button;
struct input_dev *input;
struct timer_list timer;
};
struct gpio_keys_drvdata {
struct input_dev *input;
struct gpio_button_data data[0];
};
static void gpio_keys_report_event(struct gpio_keys_button *button,
struct input_dev *input)
{
unsigned int type = button->type ?: EV_KEY;
int state = (gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low;
input_event(input, type, button->code, !!state);
input_sync(input);
}
static void gpio_check_button(unsigned long _data)
{
struct gpio_button_data *data = (struct gpio_button_data *)_data;
gpio_keys_report_event(data->button, data->input);
}
static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
{
int i;
struct platform_device *pdev = dev_id;
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input = platform_get_drvdata(pdev);
struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
int i;
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &pdata->buttons[i];
int gpio = button->gpio;
if (irq == gpio_to_irq(gpio)) {
unsigned int type = button->type ?: EV_KEY;
int state = (gpio_get_value(gpio) ? 1 : 0) ^ button->active_low;
if (irq == gpio_to_irq(button->gpio)) {
struct gpio_button_data *bdata = &ddata->data[i];
if (button->debounce_interval)
mod_timer(&bdata->timer,
jiffies +
msecs_to_jiffies(button->debounce_interval));
else
gpio_keys_report_event(button, bdata->input);
input_event(input, type, button->code, !!state);
input_sync(input);
return IRQ_HANDLED;
}
}
@ -53,17 +84,21 @@ static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
static int __devinit gpio_keys_probe(struct platform_device *pdev)
{
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct gpio_keys_drvdata *ddata;
struct input_dev *input;
int i, error;
int wakeup = 0;
ddata = kzalloc(sizeof(struct gpio_keys_drvdata) +
pdata->nbuttons * sizeof(struct gpio_button_data),
GFP_KERNEL);
input = input_allocate_device();
if (!input)
return -ENOMEM;
if (!ddata || !input) {
error = -ENOMEM;
goto fail1;
}
platform_set_drvdata(pdev, input);
input->evbit[0] = BIT_MASK(EV_KEY);
platform_set_drvdata(pdev, ddata);
input->name = pdev->name;
input->phys = "gpio-keys/input0";
@ -74,16 +109,23 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
input->id.product = 0x0001;
input->id.version = 0x0100;
ddata->input = input;
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_keys_button *button = &pdata->buttons[i];
struct gpio_button_data *bdata = &ddata->data[i];
int irq;
unsigned int type = button->type ?: EV_KEY;
bdata->input = input;
setup_timer(&bdata->timer,
gpio_check_button, (unsigned long)bdata);
error = gpio_request(button->gpio, button->desc ?: "gpio_keys");
if (error < 0) {
pr_err("gpio-keys: failed to request GPIO %d,"
" error %d\n", button->gpio, error);
goto fail;
goto fail2;
}
error = gpio_direction_input(button->gpio);
@ -92,7 +134,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
" direction for GPIO %d, error %d\n",
button->gpio, error);
gpio_free(button->gpio);
goto fail;
goto fail2;
}
irq = gpio_to_irq(button->gpio);
@ -102,7 +144,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
" for GPIO %d, error %d\n",
button->gpio, error);
gpio_free(button->gpio);
goto fail;
goto fail2;
}
error = request_irq(irq, gpio_keys_isr,
@ -114,7 +156,7 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
pr_err("gpio-keys: Unable to claim irq %d; error %d\n",
irq, error);
gpio_free(button->gpio);
goto fail;
goto fail2;
}
if (button->wakeup)
@ -127,21 +169,25 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
if (error) {
pr_err("gpio-keys: Unable to register input device, "
"error: %d\n", error);
goto fail;
goto fail2;
}
device_init_wakeup(&pdev->dev, wakeup);
return 0;
fail:
fail2:
while (--i >= 0) {
free_irq(gpio_to_irq(pdata->buttons[i].gpio), pdev);
if (pdata->buttons[i].debounce_interval)
del_timer_sync(&ddata->data[i].timer);
gpio_free(pdata->buttons[i].gpio);
}
platform_set_drvdata(pdev, NULL);
fail1:
input_free_device(input);
kfree(ddata);
return error;
}
@ -149,7 +195,8 @@ static int __devinit gpio_keys_probe(struct platform_device *pdev)
static int __devexit gpio_keys_remove(struct platform_device *pdev)
{
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input = platform_get_drvdata(pdev);
struct gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
struct input_dev *input = ddata->input;
int i;
device_init_wakeup(&pdev->dev, 0);
@ -157,6 +204,8 @@ static int __devexit gpio_keys_remove(struct platform_device *pdev)
for (i = 0; i < pdata->nbuttons; i++) {
int irq = gpio_to_irq(pdata->buttons[i].gpio);
free_irq(irq, pdev);
if (pdata->buttons[i].debounce_interval)
del_timer_sync(&ddata->data[i].timer);
gpio_free(pdata->buttons[i].gpio);
}

1
include/linux/gpio_keys.h
View file

@ -9,6 +9,7 @@ struct gpio_keys_button {
char *desc;
int type; /* input event type (EV_KEY, EV_SW) */
int wakeup; /* configure the button as a wake-up source */
int debounce_interval; /* debounce ticks interval in msecs */
};
struct gpio_keys_platform_data {