- ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
- if (!ec_ecdt)
- return -ENOMEM;
- memset(ec_ecdt, 0, sizeof(struct acpi_ec));
-
- mutex_init(&ec_ecdt->lock);
- if (acpi_ec_mode == EC_INTR) {
- init_waitqueue_head(&ec_ecdt->wait);
- }
- ec_ecdt->command_addr = ecdt_ptr->ec_control.address;
- ec_ecdt->data_addr = ecdt_ptr->ec_data.address;
- ec_ecdt->gpe = ecdt_ptr->gpe_bit;
- /* use the GL just to be safe */
- ec_ecdt->global_lock = TRUE;
- ec_ecdt->uid = ecdt_ptr->uid;
-
- status =
- acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
- if (ACPI_FAILURE(status)) {
- goto error;
+ status = acpi_get_table(ACPI_SIG_ECDT, 1,
+ (struct acpi_table_header **)&ecdt_ptr);
+ if (ACPI_SUCCESS(status)) {
+ pr_info(PREFIX "EC description table is found, configuring boot EC\n");
+ boot_ec->command_addr = ecdt_ptr->control.address;
+ boot_ec->data_addr = ecdt_ptr->data.address;
+ boot_ec->gpe = ecdt_ptr->gpe;
+ boot_ec->handle = ACPI_ROOT_OBJECT;
+ } else {
+ /* This workaround is needed only on some broken machines,
+ * which require early EC, but fail to provide ECDT */
+ acpi_handle x;
+ printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
+ status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
+ boot_ec, NULL);
+ /* Check that acpi_get_devices actually find something */
+ if (ACPI_FAILURE(status) || !boot_ec->handle)
+ goto error;
+ /* We really need to limit this workaround, the only ASUS,
+ * which needs it, has fake EC._INI method, so use it as flag.
+ * Keep boot_ec struct as it will be needed soon.
+ */
+ if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
+ return -ENODEV;