+/*
+ * Creates uevent modalias field for ACPI enumerated devices.
+ * Because the other buses does not support ACPI HIDs & CIDs.
+ * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
+ * "acpi:IBM0001:ACPI0001"
+ */
+int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct acpi_device *acpi_dev;
+ int len;
+
+ acpi_dev = ACPI_COMPANION(dev);
+ if (!acpi_dev)
+ return -ENODEV;
+
+ /* Fall back to bus specific way of modalias exporting */
+ if (list_empty(&acpi_dev->pnp.ids))
+ return -ENODEV;
+
+ if (add_uevent_var(env, "MODALIAS="))
+ return -ENOMEM;
+ len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
+ sizeof(env->buf) - env->buflen);
+ if (len <= 0)
+ return len;
+ env->buflen += len;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias);
+
+/*
+ * Creates modalias sysfs attribute for ACPI enumerated devices.
+ * Because the other buses does not support ACPI HIDs & CIDs.
+ * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get:
+ * "acpi:IBM0001:ACPI0001"
+ */
+int acpi_device_modalias(struct device *dev, char *buf, int size)
+{
+ struct acpi_device *acpi_dev;
+ int len;
+
+ acpi_dev = ACPI_COMPANION(dev);
+ if (!acpi_dev)
+ return -ENODEV;
+
+ /* Fall back to bus specific way of modalias exporting */
+ if (list_empty(&acpi_dev->pnp.ids))
+ return -ENODEV;
+
+ len = create_modalias(acpi_dev, buf, size -1);
+ if (len <= 0)
+ return len;
+ buf[len++] = '\n';
+ return len;
+}
+EXPORT_SYMBOL_GPL(acpi_device_modalias);
+