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gpio: twl4030: Implement .get_direction()

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It's nice to be able to read back the direction of the GPIO
line from the hardware so implement .get_direction() for
twl4030.

Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2018-09-03 09:52:10 +02:00
parent ecb07684a5
commit ab8c1e8293
1 changed files with 41 additions and 1 deletions
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42
drivers/gpio/gpio-twl4030.c
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@ -154,6 +154,23 @@ static int twl4030_set_gpio_direction(int gpio, int is_input)
return ret;
}
static int twl4030_get_gpio_direction(int gpio)
{
u8 d_bnk = gpio >> 3;
u8 d_msk = BIT(gpio & 0x7);
u8 base = REG_GPIODATADIR1 + d_bnk;
int ret = 0;
ret = gpio_twl4030_read(base);
if (ret < 0)
return ret;
/* 1 = output, but gpiolib semantics are inverse so invert */
ret = !(ret & d_msk);
return ret;
}
static int twl4030_set_gpio_dataout(int gpio, int enable)
{
u8 d_bnk = gpio >> 3;
@ -359,6 +376,28 @@ static int twl_direction_out(struct gpio_chip *chip, unsigned offset, int value)
return ret;
}
static int twl_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
/*
* Default 0 = output
* LED GPIOs >= TWL4030_GPIO_MAX are always output
*/
int ret = 0;
mutex_lock(&priv->mutex);
if (offset < TWL4030_GPIO_MAX) {
ret = twl4030_get_gpio_direction(offset);
if (ret) {
mutex_unlock(&priv->mutex);
return ret;
}
}
mutex_unlock(&priv->mutex);
return ret;
}
static int twl_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct gpio_twl4030_priv *priv = gpiochip_get_data(chip);
@ -374,8 +413,9 @@ static const struct gpio_chip template_chip = {
.request = twl_request,
.free = twl_free,
.direction_input = twl_direction_in,
.get = twl_get,
.direction_output = twl_direction_out,
.get_direction = twl_get_direction,
.get = twl_get,
.set = twl_set,
.to_irq = twl_to_irq,
.can_sleep = true,