From patchwork Wed Mar 15 19:29:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elson Roy Serrao X-Patchwork-Id: 663984 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0F50C6FD1D for ; Wed, 15 Mar 2023 19:29:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232116AbjCOT33 (ORCPT ); Wed, 15 Mar 2023 15:29:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49502 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231751AbjCOT30 (ORCPT ); Wed, 15 Mar 2023 15:29:26 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 453516B305; Wed, 15 Mar 2023 12:29:20 -0700 (PDT) Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 32FHY9Y1024142; Wed, 15 Mar 2023 19:29:14 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=qcppdkim1; bh=i0XJRS5q6hBPStYCsWrDNHvg1jTjLpcHlCzKYJqObk4=; b=X04l4+AKtNT377UJNURrKRhSS+112H5GkOZhXRQBZkPxM7HUZ3bKDj87JZX2jZGIZGfs FbPNd9ewb2kDrROXIgAMNZE8RtHtGZUp53Cz0bv2X3L8dJ4aIFrExC2MHe0PMDo+z6uR MY2Cn4Yy5jc2S1fzjMx0hg2ljX0roqH16jrZfSlnsDiDTBh2IfX0guClQsoAhFr7AySr 9FrTzgbS77/cNcsrFD1qxFJOFr0kP5OSZ/e1Urw+hS8XRXkKsNKw+3LTUrgmwZnDq+Hq 6hN1pocYwJytBKh+bwOjihOvVWYm49RwhCpBROGKW+A9SkTQ698m/ErUJXiX5jsIx99v OQ== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3pbjfu8adw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 15 Mar 2023 19:29:14 +0000 Received: from pps.filterd (NALASPPMTA05.qualcomm.com [127.0.0.1]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 32FJTDoN017463; Wed, 15 Mar 2023 19:29:13 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NALASPPMTA05.qualcomm.com (PPS) with ESMTP id 3p8jqm2j9g-1; Wed, 15 Mar 2023 19:29:13 +0000 Received: from NALASPPMTA05.qualcomm.com (NALASPPMTA05.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 32FJTDab017450; Wed, 15 Mar 2023 19:29:13 GMT Received: from hu-devc-lv-c.qualcomm.com (hu-eserrao-lv.qualcomm.com [10.47.235.164]) by NALASPPMTA05.qualcomm.com (PPS) with ESMTP id 32FJTCkL017448; Wed, 15 Mar 2023 19:29:13 +0000 Received: by hu-devc-lv-c.qualcomm.com (Postfix, from userid 464172) id BF92F20E56; Wed, 15 Mar 2023 12:29:12 -0700 (PDT) From: Elson Roy Serrao To: gregkh@linuxfoundation.org, Thinh.Nguyen@synopsys.com, balbi@kernel.org Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, quic_wcheng@quicinc.com, quic_jackp@quicinc.com, Elson Roy Serrao Subject: [PATCH v10 3/5] usb: gadget: Add function wakeup support Date: Wed, 15 Mar 2023 12:29:09 -0700 Message-Id: <1678908551-27666-4-git-send-email-quic_eserrao@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1678908551-27666-1-git-send-email-quic_eserrao@quicinc.com> References: <1678908551-27666-1-git-send-email-quic_eserrao@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: qhx48nvtvrief3pN5Ig2zIzfupFlbito X-Proofpoint-GUID: qhx48nvtvrief3pN5Ig2zIzfupFlbito X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-15_10,2023-03-15_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 spamscore=0 suspectscore=0 mlxlogscore=482 priorityscore=1501 lowpriorityscore=0 adultscore=0 phishscore=0 mlxscore=0 bulkscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2302240000 definitions=main-2303150162 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org USB3.2 spec section 9.2.5.4 quotes that a function may signal that it wants to exit from Function Suspend by sending a Function Wake Notification to the host if it is enabled for function remote wakeup. Add an api in composite layer that can be used by the function drivers to support this feature. Also expose a gadget op so that composite layer can trigger a wakeup request to the UDC driver. Reviewed-by: Thinh Nguyen Signed-off-by: Elson Roy Serrao --- drivers/usb/gadget/composite.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/linux/usb/composite.h | 6 ++++++ include/linux/usb/gadget.h | 1 + 3 files changed, 47 insertions(+) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index c9c983e..2111732 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -492,6 +492,46 @@ int usb_interface_id(struct usb_configuration *config, } EXPORT_SYMBOL_GPL(usb_interface_id); +/** + * usb_func_wakeup - sends function wake notification to the host. + * @func: function that sends the remote wakeup notification. + * + * Applicable to devices operating at enhanced superspeed when usb + * functions are put in function suspend state and armed for function + * remote wakeup. On completion, function wake notification is sent. If + * the device is in low power state it tries to bring the device to active + * state before sending the wake notification. Since it is a synchronous + * call, caller must take care of not calling it in interrupt context. + * For devices operating at lower speeds returns negative errno. + * + * Returns zero on success, else negative errno. + */ +int usb_func_wakeup(struct usb_function *func) +{ + struct usb_gadget *gadget = func->config->cdev->gadget; + int id; + + if (!gadget->ops->func_wakeup) + return -EOPNOTSUPP; + + if (!func->func_wakeup_armed) { + ERROR(func->config->cdev, "not armed for func remote wakeup\n"); + return -EINVAL; + } + + for (id = 0; id < MAX_CONFIG_INTERFACES; id++) + if (func->config->interface[id] == func) + break; + + if (id == MAX_CONFIG_INTERFACES) { + ERROR(func->config->cdev, "Invalid function\n"); + return -EINVAL; + } + + return gadget->ops->func_wakeup(gadget, id); +} +EXPORT_SYMBOL_GPL(usb_func_wakeup); + static u8 encode_bMaxPower(enum usb_device_speed speed, struct usb_configuration *c) { diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index d949e91..a2448e9 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -150,6 +150,9 @@ struct usb_os_desc_table { * GetStatus() request when the recipient is Interface. * @func_suspend: callback to be called when * SetFeature(FUNCTION_SUSPEND) is reseived + * @func_suspended: Indicates whether the function is in function suspend state. + * @func_wakeup_armed: Indicates whether the function is armed by the host for + * wakeup signaling. * * A single USB function uses one or more interfaces, and should in most * cases support operation at both full and high speeds. Each function is @@ -220,6 +223,8 @@ struct usb_function { int (*get_status)(struct usb_function *); int (*func_suspend)(struct usb_function *, u8 suspend_opt); + bool func_suspended; + bool func_wakeup_armed; /* private: */ /* internals */ struct list_head list; @@ -241,6 +246,7 @@ int config_ep_by_speed_and_alt(struct usb_gadget *g, struct usb_function *f, int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f, struct usb_ep *_ep); +int usb_func_wakeup(struct usb_function *func); #define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */ diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 1d79612..75bda078 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -310,6 +310,7 @@ struct usb_udc; struct usb_gadget_ops { int (*get_frame)(struct usb_gadget *); int (*wakeup)(struct usb_gadget *); + int (*func_wakeup)(struct usb_gadget *gadget, int intf_id); int (*set_remote_wakeup)(struct usb_gadget *, int set); int (*set_selfpowered) (struct usb_gadget *, int is_selfpowered); int (*vbus_session) (struct usb_gadget *, int is_active);