On Friday, November 21, 2014 03:11:51 PM Aaron Lu wrote:
> The same virtual GPIO strategy is also used for the AXP288 PMIC in that
> various control methods that are used to do power rail handling and
> sensor reading/setting will touch GPIO fields defined under the PMIC
> device. The GPIO fileds are only defined by the ACPI code while the
> actual hardware doesn't really have a GPIO controller, but to make those
> control method execution succeed, we have to install a GPIO handler for
> the PMIC device handle. Since we do not need the virtual GPIO strategy,
> we can simply do nothing in that handler.
>
> Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
> ---
> drivers/acpi/pmic/intel_pmic_xpower.c | 27 +++++++++++++++++++++++----
> 1 file changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/acpi/pmic/intel_pmic_xpower.c b/drivers/acpi/pmic/intel_pmic_xpower.c
> index 6c4d6ce0cff1..480c41c36444 100644
> --- a/drivers/acpi/pmic/intel_pmic_xpower.c
> +++ b/drivers/acpi/pmic/intel_pmic_xpower.c
> @@ -251,13 +251,32 @@ static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
> .thermal_table_count = ARRAY_SIZE(thermal_table),
> };
>
> +static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
> + acpi_physical_address address, u32 bit_width, u64 *value,
> + void *handler_context, void *region_context)
> +{
> + return AE_OK;
> +}
>
> static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
> {
> - struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
> - return intel_pmic_install_opregion_handler(&pdev->dev,
> - ACPI_HANDLE(pdev->dev.parent), axp20x->regmap,
> - &intel_xpower_pmic_opregion_data);
> + struct device *parent = pdev->dev.parent;
> + struct axp20x_dev *axp20x = dev_get_drvdata(parent);
> + acpi_status status;
> + int result;
> +
> + result = intel_pmic_install_opregion_handler(&pdev->dev,
> + ACPI_HANDLE(parent), axp20x->regmap,
> + &intel_xpower_pmic_opregion_data);
> + if (!result) {
> + status = acpi_install_address_space_handler(
> + ACPI_HANDLE(parent), ACPI_ADR_SPACE_GPIO,
> + intel_xpower_pmic_gpio_handler, NULL, NULL);
So here we have a problem, because we can't unregister the opregion handler
registered above if this fails. Not nice.
> + if (ACPI_FAILURE(status))
> + result = -ENODEV;
> + }
> +
> + return result;
> }
>
> static struct platform_driver intel_xpower_pmic_opregion_driver = {
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
