diff options
| -rw-r--r-- | drivers/gpio/gpio-axp209.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-axp209.c b/drivers/gpio/gpio-axp209.c index 3174799c27c6..d9c2a517c6df 100644 --- a/drivers/gpio/gpio-axp209.c +++ b/drivers/gpio/gpio-axp209.c @@ -77,6 +77,35 @@ static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset) return !!(val & BIT(offset + 4)); } +static int axp20x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) +{ + struct axp20x_gpio *gpio = gpiochip_get_data(chip); + unsigned int val; + int reg, ret; + + reg = axp20x_gpio_get_reg(offset); + if (reg < 0) + return reg; + + ret = regmap_read(gpio->regmap, reg, &val); + if (ret) + return ret; + + /* + * This shouldn't really happen if the pin is in use already, + * or if it's not in use yet, it doesn't matter since we're + * going to change the value soon anyway. Default to output. + */ + if ((val & AXP20X_GPIO_FUNCTIONS) > 2) + return 0; + + /* + * The GPIO directions are the three lowest values. + * 2 is input, 0 and 1 are output + */ + return val & 2; +} + static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset, int value) { @@ -123,6 +152,7 @@ static int axp20x_gpio_probe(struct platform_device *pdev) gpio->chip.label = dev_name(&pdev->dev); gpio->chip.owner = THIS_MODULE; gpio->chip.get = axp20x_gpio_get; + gpio->chip.get_direction = axp20x_gpio_get_direction; gpio->chip.set = axp20x_gpio_set; gpio->chip.direction_input = axp20x_gpio_input; gpio->chip.direction_output = axp20x_gpio_output; |