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Commit b12c35e2 authored by Mark Brown's avatar Mark Brown Committed by Samuel Ortiz
Browse files

gpiolib: Implement set_debounce for WM831x GPIOs 



The debounce times are approximate, they can be selected using the two
input functions.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent f94add3b

drivers/gpio/wm831x-gpio.c

+32 −0
Original line number Diff line number Diff line
@@ -108,6 +108,37 @@ static int wm831x_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 
	return wm831x->irq_base + WM831X_IRQ_GPIO_1 + offset;

}



static int wm831x_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,

				    unsigned debounce)

{

	struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip);

	struct wm831x *wm831x = wm831x_gpio->wm831x;

	int reg = WM831X_GPIO1_CONTROL + offset;

	int ret, fn;



	ret = wm831x_reg_read(wm831x, reg);

	if (ret < 0)

		return ret;



	switch (ret & WM831X_GPN_FN_MASK) {

	case 0:

	case 1:

		break;

	default:

		/* Not in GPIO mode */

		return -EBUSY;

	}



	if (debounce >= 32 && debounce <= 64)

		fn = 0;

	else if (debounce >= 4000 && debounce <= 8000)

		fn = 1;

	else

		return -EINVAL;



	return wm831x_set_bits(wm831x, reg, WM831X_GPN_FN_MASK, fn);

}



#ifdef CONFIG_DEBUG_FS

static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)

{
@@ -208,6 +239,7 @@ static struct gpio_chip template_chip = { 
	.direction_output	= wm831x_gpio_direction_out,

	.set			= wm831x_gpio_set,

	.to_irq			= wm831x_gpio_to_irq,

	.set_debounce		= wm831x_gpio_set_debounce,

	.dbg_show		= wm831x_gpio_dbg_show,

	.can_sleep		= 1,

};