From patchwork Thu Jun 17 09:58:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 463285 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 93853C2B9F4 for ; Thu, 17 Jun 2021 09:59:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 74ED561410 for ; Thu, 17 Jun 2021 09:59:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231419AbhFQKBT (ORCPT ); Thu, 17 Jun 2021 06:01:19 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:45162 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232172AbhFQKBR (ORCPT ); Thu, 17 Jun 2021 06:01:17 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1623923950; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=FDIuG8YEwdWYR3GNAlZ3/WT/tm9DdB90hp34bgrxsuI=; b=Nr4bNxLjR+G6xr30ebVplWC7gFMzDNbsOgSVeRgTyTOhWO/A0Ds7hYUjBKBWyGYJMyOszome 64sn/X0p25LvbS5DnXq0argyf69zvMiYq8WGho00b26jFN6P4rzcyqT4K1DVXzrQf2TL/ob0 zN31Gi7iL363U4ojaxGlYn5VNpQ= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI1YmJiNiIsICJkZXZpY2V0cmVlQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n04.prod.us-west-2.postgun.com with SMTP id 60cb1cc2ed59bf69ccec9a04 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 17 Jun 2021 09:58:26 GMT Sender: wcheng=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 3D1C5C43149; Thu, 17 Jun 2021 09:58:26 +0000 (UTC) Received: from wcheng-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: wcheng) by smtp.codeaurora.org (Postfix) with ESMTPSA id C725FC433F1; Thu, 17 Jun 2021 09:58:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org C725FC433F1 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=wcheng@codeaurora.org From: Wesley Cheng To: balbi@kernel.org, gregkh@linuxfoundation.org, robh+dt@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org, frowand.list@gmail.com Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, jackp@codeaurora.org, fntoth@gmail.com, heikki.krogerus@linux.intel.com, andy.shevchenko@gmail.com, Wesley Cheng Subject: [PATCH v10 1/6] usb: gadget: udc: core: Introduce check_config to verify USB configuration Date: Thu, 17 Jun 2021 02:58:14 -0700 Message-Id: <1623923899-16759-2-git-send-email-wcheng@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1623923899-16759-1-git-send-email-wcheng@codeaurora.org> References: <1623923899-16759-1-git-send-email-wcheng@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Some UDCs may have constraints on how many high bandwidth endpoints it can support in a certain configuration. This API allows for the composite driver to pass down the total number of endpoints to the UDC so it can verify it has the required resources to support the configuration. Signed-off-by: Wesley Cheng --- drivers/usb/gadget/udc/core.c | 25 +++++++++++++++++++++++++ include/linux/usb/gadget.h | 5 +++++ 2 files changed, 30 insertions(+) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index b7f0b1e..e33ae2d 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1003,6 +1003,31 @@ int usb_gadget_ep_match_desc(struct usb_gadget *gadget, } EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc); +/** + * usb_gadget_check_config - checks if the UDC can support the number of eps + * @gadget: controller to check the USB configuration + * @ep_map: bitmap of endpoints being requested by a USB configuration + * + * Ensure that a UDC is able to support the number of endpoints within a USB + * configuration, and that there are no resource limitations to support all + * requested eps. + * + * Returns zero on success, else a negative errno. + */ +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map) +{ + int ret = 0; + + if (!gadget->ops->check_config) + goto out; + + ret = gadget->ops->check_config(gadget, ep_map); + +out: + return ret; +} +EXPORT_SYMBOL_GPL(usb_gadget_check_config); + /* ------------------------------------------------------------------------- */ static void usb_gadget_state_work(struct work_struct *work) diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 75c7538..fcde3b3 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -329,6 +329,7 @@ struct usb_gadget_ops { struct usb_ep *(*match_ep)(struct usb_gadget *, struct usb_endpoint_descriptor *, struct usb_ss_ep_comp_descriptor *); + int (*check_config)(struct usb_gadget *gadget, unsigned long ep_map); }; /** @@ -608,6 +609,7 @@ int usb_gadget_connect(struct usb_gadget *gadget); int usb_gadget_disconnect(struct usb_gadget *gadget); int usb_gadget_deactivate(struct usb_gadget *gadget); int usb_gadget_activate(struct usb_gadget *gadget); +int usb_gadget_check_config(struct usb_gadget *gadget, unsigned long ep_map); #else static inline int usb_gadget_frame_number(struct usb_gadget *gadget) { return 0; } @@ -631,6 +633,9 @@ static inline int usb_gadget_deactivate(struct usb_gadget *gadget) { return 0; } static inline int usb_gadget_activate(struct usb_gadget *gadget) { return 0; } +static inline int usb_gadget_check_config(struct usb_gadget *gadget, + unsigned long ep_map) +{ return 0; } #endif /* CONFIG_USB_GADGET */ /*-------------------------------------------------------------------------*/