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Wed, 12 Jul 2023 08:23:03 GMT Received: from hu-schowdhu-blr.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Wed, 12 Jul 2023 01:22:59 -0700 From: Souradeep Chowdhury To: , , Andy Gross , Konrad Dybcio , "Bjorn Andersson" , CC: , , Sibi Sankar , Rajendra Nayak , Souradeep Chowdhury Subject: [PATCH V1 1/3] usb: misc: Add the interface for notifier call for Embedded USB Debugger(EUD) Date: Wed, 12 Jul 2023 13:52:38 +0530 Message-ID: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: HmumV-VRMaraD9yASJM1jw0BP7fj7PtJ X-Proofpoint-GUID: HmumV-VRMaraD9yASJM1jw0BP7fj7PtJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-12_05,2023-07-11_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 priorityscore=1501 mlxlogscore=599 suspectscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307120073 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230712_012307_355730_312D14D7 X-CRM114-Status: GOOD ( 20.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the interface for notifier calls that can be made to check the role switch status of EUD. An external module can import this file and use the wrapper functions eud_register_notify to register a notifier to the EUD notifier chain, eud_unregister_notify to unregister the notifier from the chain, eud_notifier_call_chain to call the notifier chain to check the status of role-switch. These interfaces are provided to handle the case where multiple modules might go for a role-switch on the same port in which case EUD will be given priority over the rest. Signed-off-by: Souradeep Chowdhury --- drivers/usb/misc/qcom_eud_notifier.h | 10 ++++++++++ 1 file changed, 10 insertions(+) create mode 100644 drivers/usb/misc/qcom_eud_notifier.h diff --git a/drivers/usb/misc/qcom_eud_notifier.h b/drivers/usb/misc/qcom_eud_notifier.h new file mode 100644 index 000000000000..0cae42a5f6bf --- /dev/null +++ b/drivers/usb/misc/qcom_eud_notifier.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Released under the GPLv2 only. + */ + +#include + +extern int eud_register_notify(struct notifier_block *nb); +extern void eud_unregister_notify(struct notifier_block *nb); +extern void eud_notifier_call_chain(unsigned long role_switch_state); From patchwork Wed Jul 12 08:22:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Souradeep Chowdhury X-Patchwork-Id: 13309789 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3F00DEB64DD for ; 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Wed, 12 Jul 2023 08:23:08 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 36C8N7mo031890 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Jul 2023 08:23:07 GMT Received: from hu-schowdhu-blr.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Wed, 12 Jul 2023 01:23:03 -0700 From: Souradeep Chowdhury To: , , Andy Gross , Konrad Dybcio , "Bjorn Andersson" , CC: , , Sibi Sankar , Rajendra Nayak , Souradeep Chowdhury Subject: [PATCH V1 2/3] usb: misc: Add notifier call chain to Embedded USB Debug(EUD) driver Date: Wed, 12 Jul 2023 13:52:39 +0530 Message-ID: <18212c7abbb8c833cc07f8500d4905b79c49ec59.1689148711.git.quic_schowdhu@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: SXiq8Dlvs04sZERfyLzjmvM9owT8ZG2m X-Proofpoint-GUID: SXiq8Dlvs04sZERfyLzjmvM9owT8ZG2m X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-12_04,2023-07-11_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 adultscore=0 mlxlogscore=955 priorityscore=1501 impostorscore=0 bulkscore=0 phishscore=0 malwarescore=0 mlxscore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307120073 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230712_012311_923216_B4882E61 X-CRM114-Status: GOOD ( 26.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add the notifier call chain to EUD driver. The notifier call chain is added to check the role-switch status of EUD. When multiple modules are switching roles on the same port, they need to call this notifier to check the role-switch status of EUD. If EUD is disabled, then the modules can go for the role-switch, otherwise it needs to be blocked. The notifier chain can be used to link multiple modules switching roles on the same port and create a ordering, priority and conflict resolution among them. The wrapper functions are defined here which can be used to register a notifier block to the chain, deregister it and also call the chain. Signed-off-by: Souradeep Chowdhury --- drivers/usb/misc/qcom_eud.c | 52 +++++++++++++++++++++++++++++++++++-- 1 file changed, 50 insertions(+), 2 deletions(-) diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c index 7f371ea1248c..e6c97a2cf2df 100644 --- a/drivers/usb/misc/qcom_eud.c +++ b/drivers/usb/misc/qcom_eud.c @@ -11,10 +11,13 @@ #include #include #include +#include +#include #include #include #include #include +#include "qcom_eud_notifier.h" #define EUD_REG_INT1_EN_MASK 0x0024 #define EUD_REG_INT_STATUS_1 0x0044 @@ -22,14 +25,16 @@ #define EUD_REG_VBUS_INT_CLR 0x0080 #define EUD_REG_CSR_EUD_EN 0x1014 #define EUD_REG_SW_ATTACH_DET 0x1018 -#define EUD_REG_EUD_EN2 0x0000 +#define EUD_REG_EUD_EN2 0x0000 #define EUD_ENABLE BIT(0) -#define EUD_INT_PET_EUD BIT(0) +#define EUD_INT_PET_EUD BIT(0) #define EUD_INT_VBUS BIT(2) #define EUD_INT_SAFE_MODE BIT(4) #define EUD_INT_ALL (EUD_INT_VBUS | EUD_INT_SAFE_MODE) +static RAW_NOTIFIER_HEAD(eud_nh); + struct eud_chip { struct device *dev; struct usb_role_switch *role_sw; @@ -41,6 +46,42 @@ struct eud_chip { bool usb_attached; }; +int eud_register_notify(struct notifier_block *nb) +{ + return raw_notifier_chain_register(&eud_nh, nb); +} +EXPORT_SYMBOL_GPL(eud_register_notify); + +void eud_unregister_notify(struct notifier_block *nb) +{ + raw_notifier_chain_unregister(&eud_nh, nb); +} +EXPORT_SYMBOL_GPL(eud_unregister_notify); + +void eud_notifier_call_chain(unsigned long role_switch_state) +{ + raw_notifier_call_chain(&eud_nh, role_switch_state, NULL); +} +EXPORT_SYMBOL_GPL(eud_notifier_call_chain); + +static int eud_vbus_spoof_attach_detach(struct notifier_block *nb, unsigned long event, + void *data) +{ + struct device_node *eud = of_find_compatible_node(NULL, NULL, "qcom,eud"); + struct device *eud_device = bus_find_device_by_of_node(&platform_bus_type, eud); + struct eud_chip *eud_data = dev_get_drvdata(eud_device); + + if (eud_data->enabled && event != USB_ROLE_DEVICE) + return NOTIFY_BAD; + else + return NOTIFY_OK; +} + +static struct notifier_block eud_notifier = { + .notifier_call = eud_vbus_spoof_attach_detach, + .priority = 1, +}; + static int enable_eud(struct eud_chip *priv) { writel(EUD_ENABLE, priv->base + EUD_REG_CSR_EUD_EN); @@ -196,6 +237,10 @@ static int eud_probe(struct platform_device *pdev) return dev_err_probe(chip->dev, ret, "failed to add role switch release action\n"); + ret = eud_register_notify(&eud_notifier); + if (ret) + return dev_err_probe(chip->dev, ret, "failed to register notifier\n"); + chip->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(chip->base)) return PTR_ERR(chip->base); @@ -226,6 +271,9 @@ static void eud_remove(struct platform_device *pdev) device_init_wakeup(&pdev->dev, false); disable_irq_wake(chip->irq); + eud_unregister_notify(&eud_notifier); + + return 0; } static const struct of_device_id eud_dt_match[] = { From patchwork Wed Jul 12 08:22:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Souradeep Chowdhury X-Patchwork-Id: 13309790 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 505F2EB64DA for ; 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Signed-off-by: Souradeep Chowdhury --- MAINTAINERS | 1 + 1 file changed, 1 insertion(+) diff --git a/MAINTAINERS b/MAINTAINERS index 3be1bdfe8ecc..6d395cc6f45c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17288,6 +17288,7 @@ L: linux-arm-msm@vger.kernel.org S: Maintained F: Documentation/ABI/testing/sysfs-driver-eud F: Documentation/devicetree/bindings/soc/qcom/qcom,eud.yaml +F: drivers/usb/misc/qcom_eud_notifier.h F: drivers/usb/misc/qcom_eud.c QCOM IPA DRIVER