From patchwork Wed Apr 3 02:09:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?Q2h1bmZlbmcgWXVuICjkupHmmKXls7Ap?= X-Patchwork-Id: 10882555 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 02A97139A for ; Wed, 3 Apr 2019 02:10:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DDA9A288F4 for ; Wed, 3 Apr 2019 02:10:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D13E728913; Wed, 3 Apr 2019 02:10:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 71978288F4 for ; Wed, 3 Apr 2019 02:10:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727254AbfDCCKP (ORCPT ); Tue, 2 Apr 2019 22:10:15 -0400 Received: from Mailgw01.mediatek.com ([1.203.163.78]:16124 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726845AbfDCCJ7 (ORCPT ); Tue, 2 Apr 2019 22:09:59 -0400 X-UUID: b78f3fae72fc42518ef56674a646ba25-20190403 X-UUID: b78f3fae72fc42518ef56674a646ba25-20190403 Received: from mtkcas34.mediatek.inc [(172.27.4.253)] by mailgw01.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLS) with ESMTP id 1738006627; Wed, 03 Apr 2019 10:09:48 +0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 3 Apr 2019 10:09:45 +0800 Received: from localhost.localdomain (10.17.3.153) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 3 Apr 2019 10:09:44 +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 , Alan Stern , , , , , Subject: [v3 PATCH 4/6] usb: roles: add API to get usb_role_switch by node Date: Wed, 3 Apr 2019 10:09:12 +0800 Message-ID: <1554257354-7440-5-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1554257354-7440-1-git-send-email-chunfeng.yun@mediatek.com> References: <1554257354-7440-1-git-send-email-chunfeng.yun@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add fwnode_usb_role_switch_get() to make easier to get usb_role_switch by fwnode which register it. It's useful when there is not device_connection registered between two drivers and only knows the fwnode which register usb_role_switch. Signed-off-by: Chunfeng Yun --- v3 changes: 1. use fwnodes instead of node suggested by Andy 2. rebuild the API suggested by Heikki v2 no changes --- drivers/usb/roles/class.c | 31 +++++++++++++++++++++++++++++++ include/linux/usb/role.h | 2 ++ 2 files changed, 33 insertions(+) diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index f45d8df5cfb8..5ecb57f8960b 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -12,6 +12,7 @@ #include #include #include +#include #include static struct class *role_class; @@ -135,6 +136,36 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) } EXPORT_SYMBOL_GPL(usb_role_switch_get); +static int __switch_match_fwnode(struct device *dev, const void *fwnode) +{ + return dev_fwnode(dev->parent) == (const struct fwnode_handle *)fwnode; +} + +/** + * fwnode_usb_role_switch_get - Find USB role switch by it's parent fwnode + * @fwnode: The fwnode that register USB role switch + * + * Finds and returns role switch registered by @fwnode. The reference count + * for the found switch is incremented. + */ +struct usb_role_switch * +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode) +{ + struct usb_role_switch *sw; + struct device *dev; + + dev = class_find_device(role_class, NULL, fwnode, + __switch_match_fwnode); + 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(fwnode_usb_role_switch_get); + /** * 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 c05ffa6abda9..d21cd55d9e45 100644 --- a/include/linux/usb/role.h +++ b/include/linux/usb/role.h @@ -46,6 +46,8 @@ 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(struct device *dev); void usb_role_switch_put(struct usb_role_switch *sw); +struct usb_role_switch * +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode); struct usb_role_switch * usb_role_switch_register(struct device *parent,