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gpiolib: Implement set_debounce for WM831x GPIOs

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

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2010-07-03 15:40:56 +02:00 committed by Samuel Ortiz
parent f94add3bd4
commit b12c35e22d
1 changed files with 32 additions and 0 deletions
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32
drivers/gpio/wm831x-gpio.c
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@ -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,
};