diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-07-03 15:40:56 +0200 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2010-08-12 11:27:57 +0200 |
| commit | b12c35e22d102172cd2a69581f939ec9a70a7942 (patch) | |
| tree | 2d75e053ab44cbec78b4389b395cc9b5048fa430 /drivers/gpio | |
| parent | f94add3bd4468939ae5ea639b34a173534a0c135 (diff) | |
| download | linux-b12c35e22d102172cd2a69581f939ec9a70a7942.tar.bz2 | |
gpiolib: Implement set_debounce for WM831x GPIOs
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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/wm831x-gpio.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/gpio/wm831x-gpio.c b/drivers/gpio/wm831x-gpio.c index 1fa449a1a4cb..309644cf4d9b 100644 --- a/drivers/gpio/wm831x-gpio.c +++ b/drivers/gpio/wm831x-gpio.c @@ -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, }; |