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Subject[net-next PATCH v5 09/15] ACPI: utils: Introduce acpi_get_local_address()
Date
Introduce a wrapper around the _ADR evaluation.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
---

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

Changes in v2: None

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 d5411a166685..0d3a2b111c0f 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -296,6 +296,20 @@ 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 053bf05fb1f7..4e5ce2b4a69d 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -699,6 +699,8 @@ 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
@@ -946,6 +948,11 @@ 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
--
2.17.1
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