From patchwork Fri Apr 26 06:47:15 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: 10918361 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 1F5CE1398 for ; Fri, 26 Apr 2019 06:47:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 040AE28B18 for ; Fri, 26 Apr 2019 06:47:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E8D4C28B22; Fri, 26 Apr 2019 06:47:51 +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 4E02C28B18 for ; Fri, 26 Apr 2019 06:47:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725942AbfDZGru (ORCPT ); Fri, 26 Apr 2019 02:47:50 -0400 Received: from Mailgw01.mediatek.com ([1.203.163.78]:30606 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725901AbfDZGru (ORCPT ); Fri, 26 Apr 2019 02:47:50 -0400 X-UUID: 2b670c16918c4daa9fff884702ae7fc9-20190426 X-UUID: 2b670c16918c4daa9fff884702ae7fc9-20190426 Received: from mtkcas34.mediatek.inc [(172.27.4.253)] by mailgw01.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLS) with ESMTP id 2088178522; Fri, 26 Apr 2019 14:47:40 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by MTKMBS31DR.mediatek.inc (172.27.6.102) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 26 Apr 2019 14:47:38 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 26 Apr 2019 14:47:37 +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 , , , , , , Biju Das , Linus Walleij Subject: [PATCH v4 4/6] usb: roles: add API to get usb_role_switch by node Date: Fri, 26 Apr 2019 14:47:15 +0800 Message-ID: <1556261237-13823-5-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1556261237-13823-1-git-send-email-chunfeng.yun@mediatek.com> References: <1556261237-13823-1-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 Tested-by: Biju Das --- v4 changes: 1. use switch_fwnode_match() to find fwnode suggested by Heikki 2. this patch now depends on [1] [1] [v6,08/13] usb: roles: Introduce stubs for the exiting functions in role.h https://patchwork.kernel.org/patch/10909971/ 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 | 25 +++++++++++++++++++++++++ include/linux/usb/role.h | 8 ++++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index f45d8df5cfb8..994fcb979795 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 +136,30 @@ struct usb_role_switch *usb_role_switch_get(struct device *dev) } EXPORT_SYMBOL_GPL(usb_role_switch_get); +/** + * 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_fwnode_match); + 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 da2b9641b877..35d460f9ec40 100644 --- a/include/linux/usb/role.h +++ b/include/linux/usb/role.h @@ -48,6 +48,8 @@ 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, @@ -72,6 +74,12 @@ static inline struct usb_role_switch *usb_role_switch_get(struct device *dev) static inline void usb_role_switch_put(struct usb_role_switch *sw) { } +static inline struct usb_role_switch * +fwnode_usb_role_switch_get(struct fwnode_handle *fwnode) +{ + return ERR_PTR(-ENODEV); +} + static inline struct usb_role_switch * usb_role_switch_register(struct device *parent, const struct usb_role_switch_desc *desc)