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gpio: acpi: Factor out acpi_gpio_to_gpiod_flags() helper 

The helper function acpi_gpio_to_gpiod_flags() will be used later to configure
pin properly whenever it's requested.

While here, introduce a checking error code returned by gpiod_configure_flags()
and bail out if it's not okay.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Andy Shevchenko 2017-05-23 20:03:22 +03:00 committed by Linus Walleij
parent ed7fcf1ed5
commit 2eca25af05
1 changed files with 36 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
drivers/gpio/gpiolib-acpi.c
View File

@ -423,6 +423,31 @@ static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
return false;
}
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;
case ACPI_IO_RESTRICT_OUTPUT:
/*
* 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.
*/
return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
default:
/*
* Assume that the BIOS has configured the direction and pull
* accordingly.
*/
return GPIOD_ASIS;
}
}
struct acpi_gpio_lookup {
struct acpi_gpio_info info;
int index;
@ -740,7 +765,6 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
struct acpi_resource *ares;
int pin_index = (int)address;
acpi_status status;
bool pull_up;
int length;
int i;
@ -755,7 +779,6 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
}
agpio = &ares->data.gpio;
pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
function == ACPI_WRITE)) {
@ -806,35 +829,23 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
}
if (!found) {
desc = gpiochip_request_own_desc(chip, pin,
"ACPI:OpRegion");
enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
const char *label = "ACPI:OpRegion";
int err;
desc = gpiochip_request_own_desc(chip, pin, label);
if (IS_ERR(desc)) {
status = AE_ERROR;
mutex_unlock(&achip->conn_lock);
goto out;
}
switch (agpio->io_restriction) {
case ACPI_IO_RESTRICT_INPUT:
gpiod_direction_input(desc);
break;
case ACPI_IO_RESTRICT_OUTPUT:
/*
* 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.
*/
gpiod_direction_output(desc, pull_up);
break;
default:
/*
* Assume that the BIOS has configured the
* direction and pull accordingly.
*/
break;
err = gpiod_configure_flags(desc, label, 0, flags);
if (err < 0) {
status = AE_NOT_CONFIGURED;
gpiochip_free_own_desc(desc);
mutex_unlock(&achip->conn_lock);
goto out;
}
conn = kzalloc(sizeof(*conn), GFP_KERNEL);