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wakeup = 1;
input_set_capability(input, type, button->code);
}
error = sysfs_create_group(&pdev->dev.kobj, &gpio_keys_attr_group);
if (error) {
dev_err(dev, "Unable to export keys/switches, error: %d\n",
error);
goto fail2;
}
error = input_register_device(input);
if (error) {
dev_err(dev, "Unable to register input device, error: %d\n",
error);
goto fail3;
}
…
Apply GPIO and setup the GPIO as the input, register GPIO interrupt.
static int __devinit gpio_keys_setup_key(struct platform_device *pdev,
struct gpio_button_data *bdata,
struct gpio_keys_button *button)
{
const char *desc = button->desc ? button->desc : "gpio_keys";
struct device *dev = &pdev->dev;
unsigned long irqflags;
int irq, error;
setup_timer(&bdata->timer, gpio_keys_timer, (unsigned long)bdata);
INIT_WORK(&bdata->work, gpio_keys_work_func);
error = gpio_request(button->gpio, desc);
if (error < 0) {
dev_err(dev, "failed to request GPIO %d, error %d\n",
button->gpio, error);
goto fail2;
}
error = gpio_direction_input(button->gpio);
if (error < 0) {
dev_err(dev, "failed to configure"
" direction for GPIO %d, error %d\n",
Page | 48