[PATCH net-next v8 10/15] ACPI: utils: Introduce acpi_get_local_address()

[Rafael J. Wysocki]

On Thu, Jun 10, 2021 at 6:40 PM Ioana Ciornei <ciorneiioana at gmail.com> wrote:
>
> From: Calvin Johnson <calvin.johnson at oss.nxp.com>
>
> Introduce a wrapper around the _ADR evaluation.
>
> Signed-off-by: Calvin Johnson <calvin.johnson at oss.nxp.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko at gmail.com>
> Signed-off-by: Ioana Ciornei <ioana.ciornei at nxp.com>

Acked-by: Rafael J. Wysocki <rafael at kernel.org>

> ---
>
> Changes in v8: None
> Changes in v7: None
> Changes in v6: None
> Changes in v5:
> - Replace fwnode_get_id() with acpi_get_local_address()
>
> Changes in v4:
> - Improve code structure to handle all cases
>
> Changes in v3:
> - Modified to retrieve reg property value for ACPI as well
> - Resolved compilation issue with CONFIG_ACPI = n
> - Added more info into documentation
>
>  drivers/acpi/utils.c | 14 ++++++++++++++
>  include/linux/acpi.h |  7 +++++++
>  2 files changed, 21 insertions(+)
>
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index 3b54b8fd7396..e7ddd281afff 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -277,6 +277,20 @@ acpi_evaluate_integer(acpi_handle handle,
>
>  EXPORT_SYMBOL(acpi_evaluate_integer);
>
> +int acpi_get_local_address(acpi_handle handle, u32 *addr)
> +{
> +       unsigned long long adr;
> +       acpi_status status;
> +
> +       status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
> +       if (ACPI_FAILURE(status))
> +               return -ENODATA;
> +
> +       *addr = (u32)adr;
> +       return 0;
> +}
> +EXPORT_SYMBOL(acpi_get_local_address);
> +
>  acpi_status
>  acpi_evaluate_reference(acpi_handle handle,
>                         acpi_string pathname,
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index c60745f657e9..6ace3a0f1415 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -710,6 +710,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
>  }
>  #endif
>
> +int acpi_get_local_address(acpi_handle handle, u32 *addr);
> +
>  #else  /* !CONFIG_ACPI */
>
>  #define acpi_disabled 1
> @@ -965,6 +967,11 @@ static inline struct acpi_device *acpi_resource_consumer(struct resource *res)
>         return NULL;
>  }
>
> +static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
> +{
> +       return -ENODEV;
> +}
> +
>  #endif /* !CONFIG_ACPI */
>
>  #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
> --
> 2.31.1
>