From patchwork Wed May 19 07:43:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 12266513 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=-16.7 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,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 E4A8FC43470 for ; Wed, 19 May 2021 07:44:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5877613AD for ; Wed, 19 May 2021 07:44:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240887AbhESHpZ (ORCPT ); Wed, 19 May 2021 03:45:25 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:21628 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240746AbhESHpX (ORCPT ); Wed, 19 May 2021 03:45:23 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1621410244; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=ckvrAD8Fxy91c2VTgWm7u/5iO+iFGDaqMi7f2GgcXZY=; b=oZn6dDS/EMCr08oPCNnOuGG0Lh2tbVK54+PbLAt4PbrNB2ZSL4l5uAcKJwH0Bi8OX/GvldCq Rmgxn/doEyVgqN/FmV3P+NJ3Z91/n+gKYxsT9dgIgpqrDrPShpxIMUJYJ2/jhwS3EAC5eWuS LNhnYtjiAX0ORZ6FassmfhbfumE= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyIxZTE2YSIsICJsaW51eC11c2JAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n01.prod.us-west-2.postgun.com with SMTP id 60a4c1c32bff04e53bf279e2 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 19 May 2021 07:44:03 GMT Sender: wcheng=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 6F502C433F1; Wed, 19 May 2021 07:44:03 +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 4701AC433D3; Wed, 19 May 2021 07:44:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 4701AC433D3 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, agross@kernel.org, bjorn.andersson@linaro.org, robh+dt@kernel.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, jackp@codeaurora.org, Thinh.Nguyen@synopsys.com, Wesley Cheng Subject: [PATCH v8 1/5] usb: gadget: udc: core: Introduce check_config to verify USB configuration Date: Wed, 19 May 2021 00:43:54 -0700 Message-Id: <1621410238-31395-2-git-send-email-wcheng@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1621410238-31395-1-git-send-email-wcheng@codeaurora.org> References: <1621410238-31395-1-git-send-email-wcheng@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-usb@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 493ff93..e67fd93 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 ee04ef2..9fb69eb 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -328,6 +328,7 @@ 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); }; /** @@ -607,6 +608,7 @@ 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; } @@ -630,6 +632,9 @@ 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 */ /*-------------------------------------------------------------------------*/