From patchwork Thu Aug 30 20:16:02 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Toshi Kani X-Patchwork-Id: 1389551 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id E3954DF264 for ; Thu, 30 Aug 2012 20:23:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752338Ab2H3UV6 (ORCPT ); Thu, 30 Aug 2012 16:21:58 -0400 Received: from g1t0026.austin.hp.com ([15.216.28.33]:13735 "EHLO g1t0026.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752313Ab2H3UV5 (ORCPT ); Thu, 30 Aug 2012 16:21:57 -0400 Received: from g1t0039.austin.hp.com (g1t0039.austin.hp.com [16.236.32.45]) by g1t0026.austin.hp.com (Postfix) with ESMTP id 6B983C703; Thu, 30 Aug 2012 20:21:56 +0000 (UTC) Received: from misato.fc.hp.com (misato.fc.hp.com [16.71.12.41]) by g1t0039.austin.hp.com (Postfix) with ESMTP id F40673451D; Thu, 30 Aug 2012 20:21:55 +0000 (UTC) From: Toshi Kani To: linux-acpi@vger.kernel.org Cc: linux-kernel@vger.kernel.org, lenb@kernel.org, bhelgaas@google.com, liuj97@gmail.com, isimatu.yasuaki@jp.fujitsu.com, Toshi Kani Subject: [RFC PATCH 1/5] ACPI: Add acpi_lookup_driver() function Date: Thu, 30 Aug 2012 14:16:02 -0600 Message-Id: <1346357766-14030-2-git-send-email-toshi.kani@hp.com> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <1346357766-14030-1-git-send-email-toshi.kani@hp.com> References: <1346357766-14030-1-git-send-email-toshi.kani@hp.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Added acpi_lookup_driver(), which looks up an associated driver for the notified ACPI device object by walking through the list of ACPI drivers. Signed-off-by: Toshi Kani --- drivers/acpi/scan.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++ include/acpi/acpi_bus.h | 2 + 2 files changed, 67 insertions(+), 0 deletions(-) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index d1ecca2..d0e0d18 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1630,3 +1630,68 @@ int __init acpi_scan_init(void) return result; } + +static int acpi_match_driver(struct device_driver *drv, void *data) +{ + struct acpi_driver *driver = to_acpi_driver(drv); + struct acpi_device *device = (struct acpi_device *) data; + int ret; + + ret = acpi_match_device_ids(device, driver->ids); + if (!ret) + device->driver = driver; + + return !ret; +} + +/** + * acpi_lookup_driver: Look up a driver for the notified ACPI device + * @handle: ACPI handle of the notified device object + * @event: Notify event + * + * Look up an associated driver for the notified ACPI device object + * by walking through the list of ACPI drivers. + */ +struct acpi_driver *acpi_lookup_driver(acpi_handle handle, u32 event) +{ + struct acpi_device *device; + struct acpi_driver *driver = NULL; + unsigned long long sta; + int type; + int ret; + + /* allocate a temporary device object */ + device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); + if (!device) { + pr_err(PREFIX "No memory to allocate a tmp device\n"); + return NULL; + } + + ret = acpi_bus_type_and_status(handle, &type, &sta); + if (ret) { + pr_err(PREFIX "Failed to get type of device\n"); + goto out; + } + + /* setup this temporary device object */ + INIT_LIST_HEAD(&device->pnp.ids); + device->device_type = type; + device->handle = handle; + device->parent = acpi_bus_get_parent(handle); + device->dev.bus = &acpi_bus_type; + device->driver = NULL; + STRUCT_TO_INT(device->status) = sta; + device->status.present = 1; + + /* set HID to this device object */ + acpi_device_set_id(device); + + /* lookup a matching driver */ + (void) bus_for_each_drv(device->dev.bus, NULL, + device, acpi_match_driver); + driver = device->driver; + +out: + kfree(device); + return driver; +} diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index bde976e..a773b46 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -345,6 +345,8 @@ extern int unregister_acpi_notifier(struct notifier_block *); extern int register_acpi_bus_notifier(struct notifier_block *nb); extern void unregister_acpi_bus_notifier(struct notifier_block *nb); +extern struct acpi_driver *acpi_lookup_driver(acpi_handle handle, u32 event); + /* * External Functions */