From: Andy Shevchenko Date: Wed, 10 Apr 2019 15:39:19 +0000 (+0300) Subject: gpiolib: acpi: Set pin value, based on bias, more accurately X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=24a49543336dbaecb83862a17f6a05d53ec2592f;p=linux.git gpiolib: acpi: Set pin value, based on bias, more accurately ACPI GpioIo() resource may have different bias settings. For now, we distinguish only PullUp() setting in order to configure the initial state of a pin. Take into consideration the rest of the possible choices as well, i.e. PullDown, PullNone and PullDefault, when configuring the initial state of the pin. Signed-off-by: Andy Shevchenko Acked-by: Hans de Goede Reviewed-by: Mika Westerberg Signed-off-by: Linus Walleij --- diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 36cd9abe5e555..878c7a7dea8b2 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -444,8 +444,6 @@ static bool acpi_get_driver_gpio_data(struct acpi_device *adev, static enum gpiod_flags acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio) { - bool pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP; - switch (agpio->io_restriction) { case ACPI_IO_RESTRICT_INPUT: return GPIOD_IN; @@ -454,16 +452,26 @@ acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio) * ACPI GPIO resources don't contain an initial value for the * GPIO. Therefore we deduce that value from the pull field * instead. If the pin is pulled up we assume default to be - * high, otherwise low. + * high, if it is pulled down we assume default to be low, + * otherwise we leave pin untouched. */ - return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; + switch (agpio->pin_config) { + case ACPI_PIN_CONFIG_PULLUP: + return GPIOD_OUT_HIGH; + case ACPI_PIN_CONFIG_PULLDOWN: + return GPIOD_OUT_LOW; + default: + break; + } default: - /* - * Assume that the BIOS has configured the direction and pull - * accordingly. - */ - return GPIOD_ASIS; + break; } + + /* + * Assume that the BIOS has configured the direction and pull + * accordingly. + */ + return GPIOD_ASIS; } static int