From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91E2CC43381 for ; Fri, 8 Mar 2019 06:15:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 62B5620811 for ; Fri, 8 Mar 2019 06:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726483AbfCHGPA (ORCPT ); Fri, 8 Mar 2019 01:15:00 -0500 Received: from Mailgw01.mediatek.com ([1.203.163.78]:36613 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725372AbfCHGO7 (ORCPT ); Fri, 8 Mar 2019 01:14:59 -0500 X-UUID: e3828aa423c04757893a6e4cdf560519-20190308 X-UUID: e3828aa423c04757893a6e4cdf560519-20190308 Received: from mtkcas32.mediatek.inc [(172.27.4.253)] by mailgw01.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLS) with ESMTP id 575490657; Fri, 08 Mar 2019 14:14:52 +0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 8 Mar 2019 14:14:44 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 8 Mar 2019 14:14:36 +0800 From: Chunfeng Yun To: Rob Herring , Greg Kroah-Hartman , Heikki Krogerus CC: Mark Rutland , Chunfeng Yun , Matthias Brugger , Adam Thomson , Li Jun , Badhri Jagan Sridharan , Hans de Goede , Andy Shevchenko , Min Guo , , , , , Subject: [PATCH 3/5] usb: roles: add API to get usb_role_switch by node Date: Fri, 8 Mar 2019 14:13:40 +0800 Message-ID: <1552025622-15582-4-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1552025622-15582-1-git-send-email-chunfeng.yun@mediatek.com> References: <1552025622-15582-1-git-send-email-chunfeng.yun@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add usb_role_switch_get_by_node() to make easier to get usb_role_switch by node which register it. It's useful when there is not device_connection registered between two drivers and only knows the node which register usb_role_switch. Signed-off-by: Chunfeng Yun --- drivers/usb/roles/class.c | 30 ++++++++++++++++++++++++++++++ include/linux/usb/role.h | 1 + 2 files changed, 31 insertions(+) diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index 99116af07f1d..284b19856dc4 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -11,6 +11,7 @@ #include #include #include +#include #include static struct class *role_class; @@ -121,6 +122,35 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) } EXPORT_SYMBOL_GPL(usb_role_switch_get); +static int __switch_match_node(struct device *dev, const void *node) +{ + return dev->parent->of_node == (const struct device_node *)node; +} + +/** + * usb_role_switch_get_by_node - Find USB role switch by it's parent node + * @node: The node that register USB role switch + * + * Finds and returns role switch registered by @node. The reference count + * for the found switch is incremented. + */ +struct usb_role_switch *usb_role_switch_get_by_node(struct device_node *node) +{ + struct usb_role_switch *sw; + struct device *dev; + + dev = class_find_device(role_class, NULL, node, + __switch_match_node); + if (!dev) + return ERR_PTR(-EPROBE_DEFER); + + sw = to_role_switch(dev); + WARN_ON(!try_module_get(sw->dev.parent->driver->owner)); + + return sw; +} +EXPORT_SYMBOL_GPL(usb_role_switch_get_by_node); + /** * usb_role_switch_put - Release handle to a switch * @sw: USB Role Switch diff --git a/include/linux/usb/role.h b/include/linux/usb/role.h index edc51be4a77c..056498b83dee 100644 --- a/include/linux/usb/role.h +++ b/include/linux/usb/role.h @@ -42,6 +42,7 @@ struct usb_role_switch_desc { int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role); enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw); +struct usb_role_switch *usb_role_switch_get_by_node(struct device_node *node); struct usb_role_switch *usb_role_switch_get(struct device *dev); void usb_role_switch_put(struct usb_role_switch *sw); -- 2.20.1