From patchwork Mon Aug 10 02:25:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Chen X-Patchwork-Id: 11706875 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8BC90618 for ; Mon, 10 Aug 2020 02:26:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5AE492068F for ; Mon, 10 Aug 2020 02:26:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=nxp.com header.i=@nxp.com header.b="pkvwRMoZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726426AbgHJC0U (ORCPT ); Sun, 9 Aug 2020 22:26:20 -0400 Received: from mail-eopbgr70080.outbound.protection.outlook.com ([40.107.7.80]:49993 "EHLO EUR04-HE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726219AbgHJC0U (ORCPT ); Sun, 9 Aug 2020 22:26:20 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=F0gYxt50NF92tdfYO8COgnKv+q01OwEL2bCLUKUM65LtkpcFuRfBlJRrqkbIcO0qN6j9hjeX5CU2hdsjA6tyFFtWQx3jOsAeVw2wu7Dl/RMTevD/VDDjhaove8DyFHK/gWjLzwb+YwAVKTQTUTX+yfad5S65inkuToV7nu+V9W9yJZtSNRUOxdgoFocKoS7b/MNuXOiswEhR1hnwTJ4UtqCagQGBdV0AzJ9ZqEO4qMC0lU3QK2Sg8LSf7dnSJYl9Bs1WQHiKD1iscqmZPsX8holRUWOyILt4nX/HWpyv28Km5b7LHHrDZu0zOp97zJHkaI7vucRthXKDWXT3b2Qb0A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ZbyXripJCHFzmjrlked+NH8AMepnnYixIufdUp/SSts=; b=IOxIp4cgp0meVUwXnrUyAL3OYMOY1yxNJVK/xrz6hRbfFjwcckMLMXjEGe2k0z5ODvHwqJjXScILSfCakwJh3bfbfpaaa9UeJ2p9qelhPm7sevjSerj/cR0PundMHgccvoQTphBPfPrTlCOkcFLjbdNu6KjbpjMTgq4CYezypBrCN/fxsb5qAE32UWBN8Ba2BfmECf0Y5Xo0bEOF7iotbXsU9x1VbzcjL2ie9vC7chN3bBndcijMCfoax/oeKz+hvrAZB0Y10tDCA6mVsW7P+3Ovco9TP4PRsYDyEYN/iVR0aQkueIjoqzo9bR3JO72WVjW933mSrouMgeGCd+WVHg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ZbyXripJCHFzmjrlked+NH8AMepnnYixIufdUp/SSts=; b=pkvwRMoZ/7txZCakjYHeNNpJ9NbMomCPdo+l39uiVCFF/CAWodOTZmuGOtqGjuCcrqiDr4M3rc0D246lc0S8NzTy74AXY1/IG3ORbG6F4gpum+cMiJM2KUKuU1+wWtIjwPPzWymMFhQxDVcZOU4gMgh/5w8em91hjovGZOPRabg= Authentication-Results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=nxp.com; Received: from AM7PR04MB7157.eurprd04.prod.outlook.com (2603:10a6:20b:118::20) by AM7PR04MB7160.eurprd04.prod.outlook.com (2603:10a6:20b:119::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3261.19; Mon, 10 Aug 2020 02:26:14 +0000 Received: from AM7PR04MB7157.eurprd04.prod.outlook.com ([fe80::ed7f:8755:5994:7fcf]) by AM7PR04MB7157.eurprd04.prod.outlook.com ([fe80::ed7f:8755:5994:7fcf%5]) with mapi id 15.20.3261.023; Mon, 10 Aug 2020 02:26:14 +0000 From: Peter Chen To: balbi@kernel.org Cc: linux-usb@vger.kernel.org, linux-imx@nxp.com, gregkh@linuxfoundation.org, stern@rowland.harvard.edu, Anton Vasilyev , Evgeny Novikov , Benjamin Herrenschmidt , Peter Chen Subject: [PATCH v2 1/6] USB: UDC: Expand device model API interface Date: Mon, 10 Aug 2020 10:25:05 +0800 Message-Id: <20200810022510.6516-2-peter.chen@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200810022510.6516-1-peter.chen@nxp.com> References: <20200810022510.6516-1-peter.chen@nxp.com> X-ClientProxiedBy: SG2PR03CA0120.apcprd03.prod.outlook.com (2603:1096:4:91::24) To AM7PR04MB7157.eurprd04.prod.outlook.com (2603:10a6:20b:118::20) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from b29397-desktop.ap.freescale.net (119.31.174.67) by SG2PR03CA0120.apcprd03.prod.outlook.com (2603:1096:4:91::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3283.5 via Frontend Transport; Mon, 10 Aug 2020 02:26:10 +0000 X-Mailer: git-send-email 2.17.1 X-Originating-IP: [119.31.174.67] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 4d5cfd54-b2fc-4eb3-e844-08d83cd4c116 X-MS-TrafficTypeDiagnostic: AM7PR04MB7160: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:392; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: JUQJI5ZW3Osq3pmX8lWcweyEUcZJTCvlKIFFnfi4AqPQ6TQeW7pqER/yNzC50eJamPzpm2LAVp6vVjTNmK1pLuAkh1Vg2qT8+6iex3w3o4eX6BfMlXDtZfq+PB3ID7FWnvZIXYRSupydjQE9rKY9VzXGsFhDgztMnzPIfB3RxlFZzT0lHCotValxB3cHgiQA6c0ezt3tTcUyoudjKBSydG5wgd0YxfmAZ7aEonI+COs+zGsc3t6YBgc73Q5olEIyh+bZ/ydE0hzL22MjHgLQq2bGPtRNLAkpBNIgFcbW8OD/xrLZpzXEJ5ZBWOwOjlQNixMWRKuhSzuaTsukYKYCyA== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM7PR04MB7157.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(4636009)(366004)(346002)(376002)(136003)(39860400002)(396003)(36756003)(2906002)(86362001)(83380400001)(1076003)(5660300002)(6916009)(6666004)(6506007)(6512007)(44832011)(2616005)(956004)(8676002)(66476007)(8936002)(66946007)(66556008)(478600001)(16526019)(26005)(52116002)(316002)(186003)(54906003)(6486002)(4326008);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4d5cfd54-b2fc-4eb3-e844-08d83cd4c116 X-MS-Exchange-CrossTenant-AuthSource: AM7PR04MB7157.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Aug 2020 02:26:14.6657 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: eLuUQSKakCQk2CUVNzDUYixtHEA2wPkIPc6hmNmOsYqmmGBGRzxh9JQXEHHu44NztYMMm8sUorxOajpuuu4mIw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR04MB7160 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Alan Stern The routines used by the UDC core to interface with the kernel's device model, namely usb_add_gadget_udc(), usb_add_gadget_udc_release(), and usb_del_gadget_udc(), provide access to only a subset of the device model's full API. They include functionality equivalent to device_register() and device_unregister() for gadgets, but they omit device_initialize(), device_add(), device_del(), get_device(), and put_device(). This patch expands the UDC API by adding usb_initialize_gadget(), usb_add_gadget(), usb_del_gadget(), usb_get_gadget(), and usb_put_gadget() to fill in the gap. It rewrites the existing routines to call the new ones. CC: Anton Vasilyev CC: Evgeny Novikov CC: Benjamin Herrenschmidt Signed-off-by: Alan Stern Signed-off-by: Peter Chen --- Changes for v1 - Add my Sob Changes for RFC - %s/intialize/initialize - Delete the net2272 and 2280 description at commit log drivers/usb/gadget/udc/core.c | 78 ++++++++++++++++++++++++++++------- include/linux/usb/gadget.h | 27 +++++++++--- 2 files changed, 84 insertions(+), 21 deletions(-) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index ee226ad802a4..473e74088b1f 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1162,21 +1162,18 @@ static int check_pending_gadget_drivers(struct usb_udc *udc) } /** - * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list + * usb_initialize_gadget - initialize a gadget and its embedded struct device * @parent: the parent device to this udc. Usually the controller driver's * device. - * @gadget: the gadget to be added to the list. + * @gadget: the gadget to be initialized. * @release: a gadget release function. * * Returns zero on success, negative errno otherwise. * Calls the gadget release function in the latter case. */ -int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, +void usb_initialize_gadget(struct device *parent, struct usb_gadget *gadget, void (*release)(struct device *dev)) { - struct usb_udc *udc; - int ret = -ENOMEM; - dev_set_name(&gadget->dev, "gadget"); INIT_WORK(&gadget->work, usb_gadget_state_work); gadget->dev.parent = parent; @@ -1187,17 +1184,32 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, gadget->dev.release = usb_udc_nop_release; device_initialize(&gadget->dev); +} +EXPORT_SYMBOL_GPL(usb_initialize_gadget); + +/** + * usb_add_gadget - adds a new gadget to the udc class driver list + * @gadget: the gadget to be added to the list. + * + * Returns zero on success, negative errno otherwise. + * Does not do a final usb_put_gadget() if an error occurs. + */ +int usb_add_gadget(struct usb_gadget *gadget) +{ + struct usb_udc *udc; + int ret = -ENOMEM; udc = kzalloc(sizeof(*udc), GFP_KERNEL); if (!udc) - goto err_put_gadget; + goto error; device_initialize(&udc->dev); udc->dev.release = usb_udc_release; udc->dev.class = udc_class; udc->dev.groups = usb_udc_attr_groups; - udc->dev.parent = parent; - ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj)); + udc->dev.parent = gadget->dev.parent; + ret = dev_set_name(&udc->dev, "%s", + kobject_name(&gadget->dev.parent->kobj)); if (ret) goto err_put_udc; @@ -1239,8 +1251,30 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, err_put_udc: put_device(&udc->dev); - err_put_gadget: - put_device(&gadget->dev); + error: + return ret; +} +EXPORT_SYMBOL_GPL(usb_add_gadget); + +/** + * usb_add_gadget_udc_release - adds a new gadget to the udc class driver list + * @parent: the parent device to this udc. Usually the controller driver's + * device. + * @gadget: the gadget to be added to the list. + * @release: a gadget release function. + * + * Returns zero on success, negative errno otherwise. + * Calls the gadget release function in the latter case. + */ +int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, + void (*release)(struct device *dev)) +{ + int ret; + + usb_initialize_gadget(parent, gadget, release); + ret = usb_add_gadget(gadget); + if (ret) + usb_put_gadget(gadget); return ret; } EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release); @@ -1308,13 +1342,14 @@ static void usb_gadget_remove_driver(struct usb_udc *udc) } /** - * usb_del_gadget_udc - deletes @udc from udc_list + * usb_del_gadget - deletes @udc from udc_list * @gadget: the gadget to be removed. * - * This, will call usb_gadget_unregister_driver() if + * This will call usb_gadget_unregister_driver() if * the @udc is still busy. + * It will not do a final usb_put_gadget(). */ -void usb_del_gadget_udc(struct usb_gadget *gadget) +void usb_del_gadget(struct usb_gadget *gadget) { struct usb_udc *udc = gadget->udc; @@ -1337,7 +1372,20 @@ void usb_del_gadget_udc(struct usb_gadget *gadget) kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE); flush_work(&gadget->work); device_unregister(&udc->dev); - device_unregister(&gadget->dev); + device_del(&gadget->dev); +} +EXPORT_SYMBOL_GPL(usb_del_gadget); + +/** + * usb_del_gadget_udc - deletes @udc from udc_list + * @gadget: the gadget to be removed. + * + * Calls usb_del_gadget() and does a final usb_put_gadget(). + */ +void usb_del_gadget_udc(struct usb_gadget *gadget) +{ + usb_del_gadget(gadget); + usb_put_gadget(gadget); memset(&gadget->dev, 0x00, sizeof(gadget->dev)); } EXPORT_SYMBOL_GPL(usb_del_gadget_udc); diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 298b334e2951..791571f5191e 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -436,6 +436,7 @@ struct usb_gadget { }; #define work_to_gadget(w) (container_of((w), struct usb_gadget, work)) +/* Interface to the device model */ static inline void set_gadget_data(struct usb_gadget *gadget, void *data) { dev_set_drvdata(&gadget->dev, data); } static inline void *get_gadget_data(struct usb_gadget *gadget) @@ -444,6 +445,26 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) { return container_of(dev, struct usb_gadget, dev); } +static inline struct usb_gadget *usb_get_gadget(struct usb_gadget *gadget) +{ + get_device(&gadget->dev); + return gadget; +} +static inline void usb_put_gadget(struct usb_gadget *gadget) +{ + put_device(&gadget->dev); +} +extern void usb_initialize_gadget(struct device *parent, + struct usb_gadget *gadget, void (*release)(struct device *dev)); +extern int usb_add_gadget(struct usb_gadget *gadget); +extern void usb_del_gadget(struct usb_gadget *gadget); + +/* Legacy device-model interface */ +extern int usb_add_gadget_udc_release(struct device *parent, + struct usb_gadget *gadget, void (*release)(struct device *dev)); +extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget); +extern void usb_del_gadget_udc(struct usb_gadget *gadget); +extern char *usb_get_gadget_udc_name(void); /* iterates the non-control endpoints; 'tmp' is a struct usb_ep pointer */ #define gadget_for_each_ep(tmp, gadget) \ @@ -735,12 +756,6 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver); */ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver); -extern int usb_add_gadget_udc_release(struct device *parent, - struct usb_gadget *gadget, void (*release)(struct device *dev)); -extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget); -extern void usb_del_gadget_udc(struct usb_gadget *gadget); -extern char *usb_get_gadget_udc_name(void); - /*-------------------------------------------------------------------------*/ /* utility to simplify dealing with string descriptors */