From patchwork Sun Jan 6 16:02:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 10749569 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 08E036C2 for ; Sun, 6 Jan 2019 16:03:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ED15A288EE for ; Sun, 6 Jan 2019 16:03:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E1B0D28905; Sun, 6 Jan 2019 16:03:12 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 8BD6D288EE for ; Sun, 6 Jan 2019 16:03:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726437AbfAFQCh (ORCPT ); Sun, 6 Jan 2019 11:02:37 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:54848 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726341AbfAFQCe (ORCPT ); Sun, 6 Jan 2019 11:02:34 -0500 Received: from localhost.localdomain (unknown [96.44.9.229]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 73A51BB9; Sun, 6 Jan 2019 17:02:31 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1546790553; bh=OKkqu7e4MT/gRqFh+/z/f4161nrtHwosurjZQeO1mXg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cfFLla9sGKVrui+KvKU35uFFWtxhBxy6c72pNwNvZLoaTv1EVuzKwb8vpJQUPNX2o ZVeaKI+m4gQEZt0ng5WaM2NCwx8KIttrNC+s9Gt4KNfRR4VlgzyPGDDagn/kb4vdUG upxvShqhSyWiVRBkx994/otO3eFCaW3oweuN7EXk= From: Paul Elder To: laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Cc: Paul Elder , b-liu@ti.com, stern@rowland.harvard.edu, rogerq@ti.com, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/6] usb: uvc: include videodev2.h in g_uvc.h Date: Sun, 6 Jan 2019 11:02:16 -0500 Message-Id: <20190106160221.4480-2-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190106160221.4480-1-paul.elder@ideasonboard.com> References: <20190106160221.4480-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 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 V4L2_EVENT_PRIVATE_START is used in g_uvc.h but is defined in videodev2.h, which is not included and causes a compiler warning: linux/usb/g_uvc.h:15:28: error: ‘V4L2_EVENT_PRIVATE_START’ undeclared here (not in a function) #define UVC_EVENT_FIRST (V4L2_EVENT_PRIVATE_START + 0) Include videodev2.h in g_uvc.h. Signed-off-by: Paul Elder Reviewed-by: Laurent Pinchart --- No change from v3 No change from v2 No change from v1 include/uapi/linux/usb/g_uvc.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/uapi/linux/usb/g_uvc.h b/include/uapi/linux/usb/g_uvc.h index 3c9ee3020cbb..6698c3263ae8 100644 --- a/include/uapi/linux/usb/g_uvc.h +++ b/include/uapi/linux/usb/g_uvc.h @@ -11,6 +11,7 @@ #include #include #include +#include #define UVC_EVENT_FIRST (V4L2_EVENT_PRIVATE_START + 0) #define UVC_EVENT_CONNECT (V4L2_EVENT_PRIVATE_START + 0) From patchwork Sun Jan 6 16:02:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 10749567 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 7EE2F6C5 for ; Sun, 6 Jan 2019 16:03:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6ED9B288EE for ; Sun, 6 Jan 2019 16:03:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 633C528905; Sun, 6 Jan 2019 16:03:10 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 F3C94288EE for ; Sun, 6 Jan 2019 16:03:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726454AbfAFQCi (ORCPT ); Sun, 6 Jan 2019 11:02:38 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:54854 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726431AbfAFQCh (ORCPT ); Sun, 6 Jan 2019 11:02:37 -0500 Received: from localhost.localdomain (unknown [96.44.9.229]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id D6EABE46; Sun, 6 Jan 2019 17:02:33 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1546790556; bh=us7SXvcOup8YY288VjEztT4JFcsjDYfGO3KSbF0zXGQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GlKyi1mD8QIH3uO1IiJt2sU/C+iuVA7WjvJYh7tPeoHlwic8r2cJ9h5I2bEUQpMXV in+ZmxcnRoh7x6c0p2e6yyVMPNbVOF7Dkxqc1/DeAPFL0x5HVmo3MfPfNkuu4zFYJd fpApEN+cEF8D2MbRSRtFU5oCnCGudRtv1qxRsLYM= From: Paul Elder To: laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Cc: Paul Elder , b-liu@ti.com, stern@rowland.harvard.edu, rogerq@ti.com, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 2/6] usb: gadget: uvc: enqueue usb request in setup handler for control OUT Date: Sun, 6 Jan 2019 11:02:17 -0500 Message-Id: <20190106160221.4480-3-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190106160221.4480-1-paul.elder@ideasonboard.com> References: <20190106160221.4480-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 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 Currently, for uvc class-specific control IN and OUT requests, in the setup handler a UVC_EVENT_SETUP with the setup control is enqueued to userspace. In response to this, the uvc function driver expects userspace to call ioctl UVCIOC_SEND_RESPONSE containing uvc request data. In the case of control IN this is fine, but for control OUT it causes a problem. Since the host sends data immediately after the setup stage completes, it is possible that the empty uvc request data is not enqueued in time for the UDC driver to put the data stage data into (this causes some UDC drivers, such as MUSB, to reply with a STALL). This problem is remedied by having the setup handler enqueue the empty uvc request data, instead of waiting for userspace to do it. Signed-off-by: Paul Elder Reviewed-by: Laurent Pinchart --- No change from v3 No change from v2 No change from v1 drivers/usb/gadget/function/f_uvc.c | 25 +++++++++++++++++++------ drivers/usb/gadget/function/uvc_v4l2.c | 7 +++++++ 2 files changed, 26 insertions(+), 6 deletions(-) diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index 3472a2863436..96054403418a 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -223,8 +223,6 @@ static int uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) { struct uvc_device *uvc = to_uvc(f); - struct v4l2_event v4l2_event; - struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) { uvcg_info(f, "invalid request type\n"); @@ -241,10 +239,25 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN); uvc->event_length = le16_to_cpu(ctrl->wLength); - memset(&v4l2_event, 0, sizeof(v4l2_event)); - v4l2_event.type = UVC_EVENT_SETUP; - memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req)); - v4l2_event_queue(&uvc->vdev, &v4l2_event); + if (uvc->event_setup_out) { + struct usb_request *req = uvc->control_req; + + /* + * Enqueue the request immediately for control OUT as the + * host will start the data stage straight away. + */ + req->length = uvc->event_length; + req->zero = 0; + usb_ep_queue(f->config->cdev->gadget->ep0, req, GFP_KERNEL); + } else { + struct v4l2_event v4l2_event; + struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; + + memset(&v4l2_event, 0, sizeof(v4l2_event)); + v4l2_event.type = UVC_EVENT_SETUP; + memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req)); + v4l2_event_queue(&uvc->vdev, &v4l2_event); + } return 0; } diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c index 4b0a82cc4763..9f7c67f6f4b2 100644 --- a/drivers/usb/gadget/function/uvc_v4l2.c +++ b/drivers/usb/gadget/function/uvc_v4l2.c @@ -35,6 +35,13 @@ uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data) struct usb_composite_dev *cdev = uvc->func.config->cdev; struct usb_request *req = uvc->control_req; + /* + * For control OUT transfers the request has been enqueued synchronously + * by the setup handler, there's nothing to be done here. + */ + if (uvc->event_setup_out) + return 0; + if (data->length < 0) return usb_ep_set_halt(cdev->gadget->ep0); From patchwork Sun Jan 6 16:02:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 10749565 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 0CE9914E5 for ; Sun, 6 Jan 2019 16:03:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F0C10288EE for ; Sun, 6 Jan 2019 16:03:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E233F28905; Sun, 6 Jan 2019 16:03:07 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 75DCD288EE for ; Sun, 6 Jan 2019 16:03:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726480AbfAFQCl (ORCPT ); Sun, 6 Jan 2019 11:02:41 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:54866 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726463AbfAFQCk (ORCPT ); Sun, 6 Jan 2019 11:02:40 -0500 Received: from localhost.localdomain (unknown [96.44.9.229]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 9A3E1BB9; Sun, 6 Jan 2019 17:02:36 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1546790558; bh=Z0MPhiLDZSbZm52jMU4nJodTsQQaLXW3FxIcfqLjeA8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uec7nr6sluoCGbni8oTQ3U1AQPs/P0o321pIw6WTNoRdoCW137WMQ+NrG3tO8y5h3 UKpk2okv3xm+V3YNIyxEF5Te1CYK6Wy6K9xEoaOxRaHJIHMKy2sAza/yoPp1WlJ+Qa rX8zl1dg5ytZlrXBxN8nbPQa/3eldflaIg8rWwqQ= From: Paul Elder To: laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Cc: Paul Elder , b-liu@ti.com, stern@rowland.harvard.edu, rogerq@ti.com, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 3/6] usb: gadget: uvc: package setup and data for control OUT requests Date: Sun, 6 Jan 2019 11:02:18 -0500 Message-Id: <20190106160221.4480-4-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190106160221.4480-1-paul.elder@ideasonboard.com> References: <20190106160221.4480-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 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 Since "usb: gadget: uvc: enqueue uvc_request_data in setup handler for control OUT requests" it is no longer necessary for userspace to call ioctl UVCIOC_SEND_RESPONSE in response to receiving a UVC_EVENT_SETUP from the uvc function driver for a control OUT request. This change means that for control OUT userspace will receive a UVC_EVENT_SETUP and not do anything with it. This is a waste of a pair of context switches, so we put the setup and data stage data into a single UVC_EVENT_DATA to give to userspace. Previously struct uvc_request_data had 60 bytes allocated for data, and since uvc data at most is 34 bytes in UVC 1.1 and 48 bytes in UVC 1.5, we can afford to cut out 8 bytes to store the setup control. Since the setup control is discarded after the handling of the setup stage, it must be saved in struct uvc_device during the setup handler in order for the data stage handler to be able to read it and send it to userspace. Signed-off-by: Paul Elder Reviewed-by: Laurent Pinchart --- No change from v3 No change from v2 No change from v1 drivers/usb/gadget/function/f_uvc.c | 3 +++ drivers/usb/gadget/function/uvc.h | 1 + include/uapi/linux/usb/g_uvc.h | 3 ++- 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index 96054403418a..aa8262c0a650 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -215,6 +215,8 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req) v4l2_event.type = UVC_EVENT_DATA; uvc_event->data.length = req->actual; memcpy(&uvc_event->data.data, req->buf, req->actual); + memcpy(&uvc_event->data.setup, &uvc->control_setup, + sizeof(uvc_event->data.setup)); v4l2_event_queue(&uvc->vdev, &v4l2_event); } } @@ -238,6 +240,7 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) */ uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN); uvc->event_length = le16_to_cpu(ctrl->wLength); + memcpy(&uvc->control_setup, ctrl, sizeof(uvc->control_setup)); if (uvc->event_setup_out) { struct usb_request *req = uvc->control_req; diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h index 671020c8a836..1d89b1df4ba0 100644 --- a/drivers/usb/gadget/function/uvc.h +++ b/drivers/usb/gadget/function/uvc.h @@ -163,6 +163,7 @@ struct uvc_device { unsigned int control_intf; struct usb_ep *control_ep; struct usb_request *control_req; + struct usb_ctrlrequest control_setup; void *control_buf; unsigned int streaming_intf; diff --git a/include/uapi/linux/usb/g_uvc.h b/include/uapi/linux/usb/g_uvc.h index 6698c3263ae8..10fbb4382925 100644 --- a/include/uapi/linux/usb/g_uvc.h +++ b/include/uapi/linux/usb/g_uvc.h @@ -24,7 +24,8 @@ struct uvc_request_data { __s32 length; - __u8 data[60]; + struct usb_ctrlrequest setup; + __u8 data[52]; }; struct uvc_event { From patchwork Sun Jan 6 16:02:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 10749561 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 641F06C2 for ; Sun, 6 Jan 2019 16:02:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 52D29288EE for ; Sun, 6 Jan 2019 16:02:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4611928904; Sun, 6 Jan 2019 16:02:57 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 AE1D728918 for ; Sun, 6 Jan 2019 16:02:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726508AbfAFQCo (ORCPT ); Sun, 6 Jan 2019 11:02:44 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:54886 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726486AbfAFQCo (ORCPT ); Sun, 6 Jan 2019 11:02:44 -0500 Received: from localhost.localdomain (unknown [96.44.9.229]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 3267C98C; Sun, 6 Jan 2019 17:02:39 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1546790561; bh=Osp6yVep2KHQJUUi+FfW4FsPLQVxJshNS0c/BdnQb2Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V/FTVeTxEKo29RYuwu2dhvkBJYUIfMZ9ephBSWI1R/y3yOVILhVGtpR1pgfO8Sqqe dP2UXmlOgfR8/wTPr3KG2rZEpxZviU4ufGkG46YwE8UYpBqQoVdskW3IV4bVMWx2kx 15jjU5qqQ0dH6lcLGlV4qeeIJxnHFW6eMaYMcY8U= From: Paul Elder To: laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Cc: Paul Elder , b-liu@ti.com, stern@rowland.harvard.edu, rogerq@ti.com, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 4/6] usb: gadget: add mechanism to specify an explicit status stage Date: Sun, 6 Jan 2019 11:02:19 -0500 Message-Id: <20190106160221.4480-5-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190106160221.4480-1-paul.elder@ideasonboard.com> References: <20190106160221.4480-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 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 A usb gadget function driver may or may not want to delay the status stage of a control OUT request. An instance where it might want to is to asynchronously validate the data of a class-specific request. A function driver that wants an explicit status stage should set the newly added explicit_status flag of the usb_request corresponding to the data stage. Later on the function driver can explicitly complete the status stage by enqueueing a usb_request for ACK, or calling usb_ep_set_halt() for STALL. To support both explicit and implicit status stages, a UDC driver must call the newly added usb_gadget_control_complete function right after calling usb_gadget_giveback_request. The status of the request that was just given back must be fed into usb_gadget_control_complete. To support the explicit status stage, it might then check what stage the usb_request was queued in, and for control IN ACK the host's zero-length data packet, or for control OUT send a zero-length DATA1 ACK packet. Signed-off-by: Paul Elder Acked-by: Alan Stern v1 Reviewed-by: Laurent Pinchart --- Changes from v3: - More specific in commit message about what to do for udc driver acking - Set explicit_status in usb_gadget_control_complete - Make explicit_status type bool Changes from v2: Add status parameter to usb_gadget_control_complete, so that a usb_request is not queued if the status of the just given back request is nonzero. Changes from v1: Complete change of API. Now we use a flag that should be set in the usb_request that is queued for the data stage to signal to the UDC that we want to delay the status stage (as opposed to setting a flag in the UDC itself, that persists across all requests). We now also provide a function for UDC drivers to very easily allow implicit status stages, to mitigate the need to convert all function drivers to this new API at once, and to make it easier for UDC drivers to convert. drivers/usb/gadget/udc/core.c | 34 ++++++++++++++++++++++++++++++++++ include/linux/usb/gadget.h | 10 ++++++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index af88b48c1cea..d3071de2b527 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -894,6 +894,40 @@ EXPORT_SYMBOL_GPL(usb_gadget_giveback_request); /* ------------------------------------------------------------------------- */ +/** + * usb_gadget_control_complete - complete the status stage of a control + * request, or delay it + * Context: in_interrupt() + * + * @gadget: gadget whose control request's status stage should be completed + * @explicit_status: true to delay status stage, false to complete here + * @status: completion code of previously completed request + * + * This is called by device controller drivers after returning the completed + * request back to the gadget layer, to either complete or delay the status + * stage. + */ +void usb_gadget_control_complete(struct usb_gadget *gadget, + bool explicit_status, int status) +{ + struct usb_request *req; + + if (explicit_status || status) + return; + + /* Send an implicit status-stage request for ep0 */ + req = usb_ep_alloc_request(gadget->ep0, GFP_ATOMIC); + if (req) { + req->length = 0; + req->explicit_status = 1; + req->complete = usb_ep_free_request; + usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); + } +} +EXPORT_SYMBOL_GPL(usb_gadget_control_complete); + +/* ------------------------------------------------------------------------- */ + /** * gadget_find_ep_by_name - returns ep whose name is the same as sting passed * in second parameter or NULL if searched endpoint not found diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index e5cd84a0f84a..498e3eaa72f1 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -73,6 +73,7 @@ struct usb_ep; * Note that for writes (IN transfers) some data bytes may still * reside in a device-side FIFO when the request is reported as * complete. + * @explicit_status: If true, delays the status stage * * These are allocated/freed through the endpoint they're used with. The * hardware's driver can add extra per-request data to the memory it returns, @@ -114,6 +115,8 @@ struct usb_request { int status; unsigned actual; + + bool explicit_status; }; /*-------------------------------------------------------------------------*/ @@ -850,6 +853,13 @@ extern void usb_gadget_giveback_request(struct usb_ep *ep, /*-------------------------------------------------------------------------*/ +/* utility to complete or delay status stage */ + +void usb_gadget_control_complete(struct usb_gadget *gadget, + bool explicit_status, int status); + +/*-------------------------------------------------------------------------*/ + /* utility to find endpoint by name */ extern struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, From patchwork Sun Jan 6 16:02:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 10749559 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 C916A6C5 for ; Sun, 6 Jan 2019 16:02:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ABF5C288EE for ; Sun, 6 Jan 2019 16:02:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9E85328905; Sun, 6 Jan 2019 16:02:56 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 05FCA288EE for ; Sun, 6 Jan 2019 16:02:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726530AbfAFQCu (ORCPT ); Sun, 6 Jan 2019 11:02:50 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:54912 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726512AbfAFQCq (ORCPT ); Sun, 6 Jan 2019 11:02:46 -0500 Received: from localhost.localdomain (unknown [96.44.9.229]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id CFE43BB9; Sun, 6 Jan 2019 17:02:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1546790564; bh=aT4DqHvI03yWEuNNCJuWMO7H2olZIVUJCWVfSGVTFJM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LmeJUL0zfdR9U9PWSdCcmHUteDhOx5yY1z6Y6hrTggBqokfsN416ykTE717JGW0F7 txsrB1LaOr6A0Yppu7dQ30D4GXa9fAyCE06IUbj6nquOYC6ZeIFXGluViAfTPj2tkG Bbb27vJTLBIHi5mZwSeESEtLli1r/qOVXQriYHQk= From: Paul Elder To: laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Cc: Paul Elder , b-liu@ti.com, stern@rowland.harvard.edu, rogerq@ti.com, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 5/6] usb: musb: gadget: implement optional explicit status stage Date: Sun, 6 Jan 2019 11:02:20 -0500 Message-Id: <20190106160221.4480-6-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190106160221.4480-1-paul.elder@ideasonboard.com> References: <20190106160221.4480-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 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 Implement the mechanism for optional explicit status stage for the MUSB driver. This allows a function driver to specify what to reply for the status stage. The functionality for an implicit status stage is retained. Signed-off-by: Paul Elder v1 Reviewed-by: Laurent Pinchart v1 Acked-by: Bin Liu --- No change from v3 Changes from v2: - update call to usb_gadget_control_complete to include status - since sending STALL from the function driver is now done with usb_ep_set_halt, there is no need for the internal ep0_send_response to take a stall/ack parameter; remove the parameter and make the function only send ack, and remove checking for the status reply in the usb_request for the status stage Changes from v1: - obvious change to implement v2 mechanism laid out by 4/6 of this series (send_response, and musb_g_ep0_send_response function has been removed, call to usb_gadget_control_complete has been added) - ep0_send_response's ack argument has been changed from stall - last_packet flag in ep0_rxstate has been removed, since it is equal to req != NULL drivers/usb/musb/musb_gadget.c | 2 ++ drivers/usb/musb/musb_gadget_ep0.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index d3f33f449445..a7a992ab0c9d 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -145,6 +145,8 @@ __acquires(ep->musb->lock) trace_musb_req_gb(req); usb_gadget_giveback_request(&req->ep->end_point, &req->request); + usb_gadget_control_complete(&musb->g, request->explicit_status, + request->status); spin_lock(&musb->lock); ep->busy = busy; } diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c index 91a5027b5c1f..bbce8a9d77e4 100644 --- a/drivers/usb/musb/musb_gadget_ep0.c +++ b/drivers/usb/musb/musb_gadget_ep0.c @@ -458,6 +458,23 @@ __acquires(musb->lock) return handled; } +static int ep0_send_ack(struct musb *musb) +{ + void __iomem *regs = musb->control_ep->regs; + u16 ackpend; + + if (musb->ep0_state != MUSB_EP0_STAGE_RX && + musb->ep0_state != MUSB_EP0_STAGE_STATUSIN) + return -EINVAL; + + ackpend = MUSB_CSR0_P_DATAEND | MUSB_CSR0_P_SVDRXPKTRDY; + + musb_ep_select(musb->mregs, 0); + musb_writew(regs, MUSB_CSR0, ackpend); + + return 0; +} + /* we have an ep0out data packet * Context: caller holds controller lock */ @@ -504,10 +521,13 @@ static void ep0_rxstate(struct musb *musb) if (req) { musb->ackpend = csr; musb_g_ep0_giveback(musb, req); + if (req->explicit_status) + return; if (!musb->ackpend) return; musb->ackpend = 0; } + musb_ep_select(musb->mregs, 0); musb_writew(regs, MUSB_CSR0, csr); } @@ -939,6 +959,9 @@ musb_g_ep0_queue(struct usb_ep *e, struct usb_request *r, gfp_t gfp_flags) case MUSB_EP0_STAGE_ACKWAIT: /* zero-length data */ status = 0; break; + case MUSB_EP0_STAGE_STATUSIN: + status = ep0_send_ack(musb); + goto cleanup; default: musb_dbg(musb, "ep0 request queued in state %d", musb->ep0_state); From patchwork Sun Jan 6 16:02:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 10749563 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 CA6C66C2 for ; Sun, 6 Jan 2019 16:03:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BA0A7288EE for ; Sun, 6 Jan 2019 16:03:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AE61A28905; Sun, 6 Jan 2019 16:03:02 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 45C15288EE for ; Sun, 6 Jan 2019 16:03:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726544AbfAFQC4 (ORCPT ); Sun, 6 Jan 2019 11:02:56 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:54934 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726521AbfAFQCs (ORCPT ); Sun, 6 Jan 2019 11:02:48 -0500 Received: from localhost.localdomain (unknown [96.44.9.229]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 6ED82E46; Sun, 6 Jan 2019 17:02:44 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1546790566; bh=U1jryTegm2hmVhmllk2UFbRQ3ZF9pJ5jXCkhgAS5+qE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c7P6GVxNVMBvgN58l5JgECAAgusyplGZvFXFeWP0R7Fu3AdMdSkyBs1R0znrk3S4q GiYntReTjqFc9xwWu7HG57AXNma2Bln9LMtxZS3L/9qU4HKAIz4wghgf0q+3PGLAKF rTQt4gmqGobclJrvg77XSQORU7LLpDeilEOASCys= From: Paul Elder To: laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Cc: Paul Elder , b-liu@ti.com, stern@rowland.harvard.edu, rogerq@ti.com, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 6/6] usb: gadget: uvc: allow ioctl to send response in status stage Date: Sun, 6 Jan 2019 11:02:21 -0500 Message-Id: <20190106160221.4480-7-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20190106160221.4480-1-paul.elder@ideasonboard.com> References: <20190106160221.4480-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 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 We now have a mechanism to signal the UDC driver to reply to a control OUT request with STALL or ACK, and we have packaged the setup stage data and the data stage data of a control OUT request into a single UVC_EVENT_DATA for userspace to consume. The ioctl UVCIOC_SEND_RESPONSE in the case of a control OUT request sends a response to the data stage, and so the ioctl now notifies the UDC driver to reply with STALL or ACK. In the case of a control IN request, the ioctl sends the UVC data as before. Also tell the UDC to delay the status stage for this to work. Signed-off-by: Paul Elder --- No change from v3 Changes from v2: - calling usb_ep_set_halt in uvc_send_response if data->length < 0 is now common for both IN and OUT transfers so make that check common - remove now unnecessary field setting for the usb_request to be queued for the status stage Changes from v1: - remove usb_ep_delay_status call from the old proposed API - changed portions of uvc_send_response to match v2 API - remove UDC warning that send_response is not implemented drivers/usb/gadget/function/f_uvc.c | 4 ++-- drivers/usb/gadget/function/uvc_v4l2.c | 23 +++++++++++++++++------ 2 files changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index aa8262c0a650..64180529fb36 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -209,14 +209,13 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req) struct uvc_event *uvc_event = (void *)&v4l2_event.u.data; if (uvc->event_setup_out) { - uvc->event_setup_out = 0; - memset(&v4l2_event, 0, sizeof(v4l2_event)); v4l2_event.type = UVC_EVENT_DATA; uvc_event->data.length = req->actual; memcpy(&uvc_event->data.data, req->buf, req->actual); memcpy(&uvc_event->data.setup, &uvc->control_setup, sizeof(uvc_event->data.setup)); + v4l2_event_queue(&uvc->vdev, &v4l2_event); } } @@ -251,6 +250,7 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) */ req->length = uvc->event_length; req->zero = 0; + req->explicit_status = 1; usb_ep_queue(f->config->cdev->gadget->ep0, req, GFP_KERNEL); } else { struct v4l2_event v4l2_event; diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c index 9f7c67f6f4b2..0bf14891b40a 100644 --- a/drivers/usb/gadget/function/uvc_v4l2.c +++ b/drivers/usb/gadget/function/uvc_v4l2.c @@ -35,15 +35,26 @@ uvc_send_response(struct uvc_device *uvc, struct uvc_request_data *data) struct usb_composite_dev *cdev = uvc->func.config->cdev; struct usb_request *req = uvc->control_req; + if (data->length < 0) + return usb_ep_set_halt(cdev->gadget->ep0); + /* * For control OUT transfers the request has been enqueued synchronously - * by the setup handler, there's nothing to be done here. + * by the setup handler, we just need to tell the UDC whether to ACK or + * STALL the control transfer. */ - if (uvc->event_setup_out) - return 0; - - if (data->length < 0) - return usb_ep_set_halt(cdev->gadget->ep0); + if (uvc->event_setup_out) { + /* + * The length field carries the control request status. + * Negative values signal a STALL and zero values an ACK. + * Positive values are not valid as there is no data to send + * back in the status stage. + */ + if (data->length > 0) + return -EINVAL; + + return usb_ep_queue(cdev->gadget->ep0, req, GFP_KERNEL); + } req->length = min_t(unsigned int, uvc->event_length, data->length); req->zero = data->length < uvc->event_length;