From patchwork Tue Jan 17 21:55:05 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: 643647 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 7F3CEC3DA78 for ; Tue, 17 Jan 2023 21:56:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229379AbjAQV4L (ORCPT ); Tue, 17 Jan 2023 16:56:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229517AbjAQVzU (ORCPT ); Tue, 17 Jan 2023 16:55:20 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10F387495B; Tue, 17 Jan 2023 13:55:16 -0800 (PST) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30HLiOQO018484; Tue, 17 Jan 2023 21:55:10 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=DTBTVZ3J++TNyfjkCKY/j8e/JcFrazIKJqXXD7rrnKA=; b=initot5HVnjFZKu8uQwL7MBiI+W2UBUOe+i5//RfPWAB93nMbHGcED1XQNp1gYslL0nZ SvUM6V3TR2GOcCNLMwxbU82+k96nB1J+op3gJFokutj3v5Xs4GJw901WXpAWabz2d1Qr kJq/8UsOSWo/zSCARmuMSevn2N7xHB+IzanvOtSRt4O3m21U1N78hJj9/QMR+TbYmAT4 AP+xQYpOGDGzw0FuXJwFCuRJ4VaQ8AJ56gvXPdIoXbd+BnfvrS9IOaVlGyk0mkCmqALj a3CXq452KztnjQHKqJc5K1aaYt1WTaSwMZU1saUsOXPfIB69xZtc2lsXCO0q94BfngHs pg== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3n3mm9xfcf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Jan 2023 21:55:10 +0000 Received: from pps.filterd (NALASPPMTA02.qualcomm.com [127.0.0.1]) by NALASPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 30HLt9BA031282; Tue, 17 Jan 2023 21:55:09 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NALASPPMTA02.qualcomm.com (PPS) with ESMTP id 3n3nfkd825-1; Tue, 17 Jan 2023 21:55:09 +0000 Received: from NALASPPMTA02.qualcomm.com (NALASPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 30HLt9iu031275; Tue, 17 Jan 2023 21:55:09 GMT Received: from hu-devc-lv-c.qualcomm.com (hu-eserrao-lv.qualcomm.com [10.47.235.164]) by NALASPPMTA02.qualcomm.com (PPS) with ESMTP id 30HLt9lq031264; Tue, 17 Jan 2023 21:55:09 +0000 Received: by hu-devc-lv-c.qualcomm.com (Postfix, from userid 464172) id 0D26320DF8; Tue, 17 Jan 2023 13:55:09 -0800 (PST) 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 v2 3/5] usb: gadget: Add function wakeup support Date: Tue, 17 Jan 2023 13:55:05 -0800 Message-Id: <1673992507-7823-4-git-send-email-quic_eserrao@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1673992507-7823-1-git-send-email-quic_eserrao@quicinc.com> References: <1673992507-7823-1-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-GUID: yDXwWPwEsRHya-O3PXqwh7oAnlniwVjT X-Proofpoint-ORIG-GUID: yDXwWPwEsRHya-O3PXqwh7oAnlniwVjT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.923,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-17_10,2023-01-17_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 spamscore=0 priorityscore=1501 malwarescore=0 suspectscore=0 impostorscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 mlxlogscore=238 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301170175 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org A function which is in function suspend state has to send a function wake notification to the host in case it needs to exit from this state and resume data transfer. Add support to handle such requests by exposing a new gadget op. Signed-off-by: Elson Roy Serrao --- drivers/usb/gadget/composite.c | 26 ++++++++++++++++++++++++++ drivers/usb/gadget/udc/core.c | 19 +++++++++++++++++++ include/linux/usb/composite.h | 6 ++++++ include/linux/usb/gadget.h | 2 ++ 4 files changed, 53 insertions(+) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index b83963a..1672513 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -490,6 +490,32 @@ int usb_interface_id(struct usb_configuration *config, } EXPORT_SYMBOL_GPL(usb_interface_id); +int usb_func_wakeup(struct usb_function *func) +{ + int ret, id; + + if (!func->func_rw_armed) { + ERROR(func->config->cdev, "func remote wakeup not enabled\n"); + return -EINVAL; + } + + DBG(func->config->cdev, "%s function wakeup\n", func->name); + + 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 id:%d\n", id); + return -EINVAL; + } + + ret = usb_gadget_func_wakeup(func->config->cdev->gadget, id); + + return ret; +} +EXPORT_SYMBOL(usb_func_wakeup); + static u8 encode_bMaxPower(enum usb_device_speed speed, struct usb_configuration *c) { diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 23b0629..73c2346 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -819,6 +819,25 @@ int usb_gadget_activate(struct usb_gadget *gadget) } EXPORT_SYMBOL_GPL(usb_gadget_activate); +/** + * usb_gadget_func_wakeup - sends function wake notification to the host. + * If the link is in low power state, first brings the link to active state. + * @gadget: controller used to wake up the host + * @interface_id: interface on which function wake notification is sent. + * + * Returns zero on success, else negative error code if the hardware + * doesn't support such attempts. Drivers must return device descriptors that + * report their ability to support this, or hosts won't enable it. + */ +int usb_gadget_func_wakeup(struct usb_gadget *gadget, int interface_id) +{ + if (!gadget->ops->func_wakeup) + return -EOPNOTSUPP; + + return gadget->ops->func_wakeup(gadget, interface_id); +} +EXPORT_SYMBOL_GPL(usb_gadget_func_wakeup); + /* ------------------------------------------------------------------------- */ #ifdef CONFIG_HAS_DMA diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index 43ac3fa..b2cac0a 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -149,6 +149,9 @@ 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_rw_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 @@ -219,6 +222,8 @@ struct usb_function { int (*get_status)(struct usb_function *); int (*func_suspend)(struct usb_function *, u8 suspend_opt); + bool func_suspended; + bool func_rw_armed; /* private: */ /* internals */ struct list_head list; @@ -240,6 +245,7 @@ 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 15785f8..47441b0 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -309,6 +309,7 @@ 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 interface_id); int (*set_selfpowered) (struct usb_gadget *, int is_selfpowered); int (*vbus_session) (struct usb_gadget *, int is_active); int (*vbus_draw) (struct usb_gadget *, unsigned mA); @@ -612,6 +613,7 @@ 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); +int usb_gadget_func_wakeup(struct usb_gadget *gadget, int interface_id); #else static inline int usb_gadget_frame_number(struct usb_gadget *gadget) { return 0; }