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[   78.427800] drivers/input/keyboard/gpio_keys.c 855 gpio_keys_init
[   78.434972] drivers/input/keyboard/gpio_keys.c 671 gpio_keys_probe
[   78.442008] gpio-keys gpio-keys.0: Unable to get irq number for GPIO 128, error -6

static int __devinit gpio_keys_setup_key(struct platform_device *pdev,
					 struct input_dev *input,
					 struct gpio_button_data *bdata,
					 const struct gpio_keys_button *button)
{
	const char *desc = button->desc ? button->desc : "gpio_keys";
	struct device *dev = &pdev->dev;
	irq_handler_t isr;
	unsigned long irqflags;
	int irq, error;
	__u32 config;

	bdata->input = input;
	bdata->button = button;
	spin_lock_init(&bdata->lock);

	if (gpio_is_valid(button->gpio)) {

		error = gpio_request(button->gpio, desc);
		if (error < 0) {
			dev_err(dev, "Failed to request GPIO %d %s, error %d\n",
				button->gpio, button->desc, error);
			return error;
		}

    config = SUNXI_PINCFG_PACK(SUNXI_PINCFG_TYPE_PUD, 1);
    pin_config_set_pin(SUNXI_PINCTRL, button->gpio, config);
    config = SUNXI_PINCFG_PACK(SUNXI_PINCFG_TYPE_DRV, 3);
    pin_config_set_pin(SUNXI_PINCTRL, button->gpio, config);
		error = gpio_direction_input(button->gpio);
		if (error < 0) {
			dev_err(dev,
				"Failed to configure direction for GPIO %d, error %d\n",
				button->gpio, error);
			goto fail;
		}

		if (button->debounce_interval) {
			error = gpio_set_debounce(button->gpio,
					button->debounce_interval * 1000);
			/* use timer if gpiolib doesn't provide debounce */
			if (error < 0)
				bdata->timer_debounce =
						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",      =================》这个位置
				button->gpio, error);
			goto fail;
		}
		bdata->irq = irq;

		INIT_WORK(&bdata->work, gpio_keys_gpio_work_func);
		setup_timer(&bdata->timer,
			    gpio_keys_gpio_timer, (unsigned long)bdata);

		isr = gpio_keys_gpio_isr;
		irqflags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;

	} else {
		if (!button->irq) {
			dev_err(dev, "No IRQ specified\n");
			return -EINVAL;
		}
		bdata->irq = button->irq;

		if (button->type && button->type != EV_KEY) {
			dev_err(dev, "Only EV_KEY allowed for IRQ buttons.\n");
			return -EINVAL;
		}

		bdata->timer_debounce = button->debounce_interval;
		setup_timer(&bdata->timer,
			    gpio_keys_irq_timer, (unsigned long)bdata);

		isr = gpio_keys_irq_isr;
		irqflags = 0;
	}

	input_set_capability(input, button->type ?: EV_KEY, button->code);

	/*
	 * If platform has specified that the button can be disabled,
	 * we don't want it to share the interrupt line.
	 */
	if (!button->can_disable)
		irqflags |= IRQF_SHARED;

	error = request_any_context_irq(bdata->irq, isr, irqflags, desc, bdata);
	if (error < 0) {
		dev_err(dev, "Unable to claim irq %d; error %d\n",
			bdata->irq, error);
		goto fail;
	}

	return 0;

fail:
	if (gpio_is_valid(button->gpio))
		gpio_free(button->gpio);

	return error;
}