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Commit ab8c1e82 authored by Linus Walleij's avatar Linus Walleij
Browse files

gpio: twl4030: Implement .get_direction() 



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: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent ecb07684

drivers/gpio/gpio-twl4030.c

+41 −1
Original line number Diff line number Diff line
@@ -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,