redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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 <andriy.shevchenko@linux.intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.2
Andy Shevchenko 2019-04-10 18:39:19 +03:00 committed by Linus Walleij
parent 80c8d927da
commit 24a4954333
1 changed files with 17 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/gpio/gpiolib-acpi.c
View File

@ -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