summaryrefslogtreecommitdiff
path: root/drivers/acpi/bus.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/bus.c')
-rw-r--r--drivers/acpi/bus.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 95855cb9d6fb..80cb5eb75b63 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -677,6 +677,48 @@ static bool acpi_of_match_device(struct acpi_device *adev,
return false;
}
+static bool acpi_of_modalias(struct acpi_device *adev,
+ char *modalias, size_t len)
+{
+ const union acpi_object *of_compatible;
+ const union acpi_object *obj;
+ const char *str, *chr;
+
+ of_compatible = adev->data.of_compatible;
+ if (!of_compatible)
+ return false;
+
+ if (of_compatible->type == ACPI_TYPE_PACKAGE)
+ obj = of_compatible->package.elements;
+ else /* Must be ACPI_TYPE_STRING. */
+ obj = of_compatible;
+
+ str = obj->string.pointer;
+ chr = strchr(str, ',');
+ strlcpy(modalias, chr ? chr + 1 : str, len);
+
+ return true;
+}
+
+/**
+ * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
+ * @adev: ACPI device object to match
+ * @default_id: ID string to use as default if no compatible string found
+ * @modalias: Pointer to buffer that modalias value will be copied into
+ * @len: Length of modalias buffer
+ *
+ * This is a counterpart of of_modalias_node() for struct acpi_device objects.
+ * If there is a compatible string for @adev, it will be copied to @modalias
+ * with the vendor prefix stripped; otherwise, @default_id will be used.
+ */
+void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
+ char *modalias, size_t len)
+{
+ if (!acpi_of_modalias(adev, modalias, len))
+ strlcpy(modalias, default_id, len);
+}
+EXPORT_SYMBOL_GPL(acpi_set_modalias);
+
static bool __acpi_match_device_cls(const struct acpi_device_id *id,
struct acpi_hardware_id *hwid)
{