From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=pass header.oldest-pass=0 smtp.remote-ip=52.101.126.127 ARC-Seal: i=2; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=pass; t=1794216247; b=pag9M+J+ZxVl7g4gR8nAeU/RiBTWZCMLOswUEVJssRysnixfWNB/F9S6ybRAnPCBUymF 86MvUhzu8j4NsgDUdBB2pf0ZU4t/h1OkT0T0eSEzGLc7OLlzybDgZnUkVO8Rf4HUsMC6F qYpu0tkXN1ECpkhQyHmCMoejdWYF4Hw+QNoheK4nadu92sMibNPGCCT63aHiac4M6FQmu 0Huy3TLemCgk9+8hx0n1vcj3IrcInfzC0Mk0nfycHULaUsSfgnuWbq5DyCndNzF2CYlhV PlXncHi0u7DHroqtMFotwaTAvOJkW4uYG2BXDOWSi2ocqCgF/9IxdCDoYuJ5AE8071g== ARC-Message-Signature: i=2; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794216247; h=DMARC-Filter:Received:Received:X-MS-Exchange-Authentication-Results: Received-SPF:Received:Received:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding:X-EOPAttributedMessage: X-MS-PublicTrafficType:X-MS-TrafficTypeDiagnostic:Content-Type: X-MS-Office365-Filtering-Correlation-Id:X-MS-Exchange-SenderADCheck: X-MS-Exchange-AntiSpam-Relay:X-Microsoft-Antispam: X-Microsoft-Antispam-Message-Info:X-Forefront-Antispam-Report: X-MS-Exchange-AntiSpam-MessageData-ChunkCount: X-MS-Exchange-AntiSpam-MessageData-0:X-OriginatorOrg: X-MS-Exchange-CrossTenant-OriginalArrivalTime: X-MS-Exchange-CrossTenant-Network-Message-Id: X-MS-Exchange-CrossTenant-Id: X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: X-MS-Exchange-CrossTenant-AuthSource:X-MS-Exchange-CrossTenant-AuthAs: X-MS-Exchange-CrossTenant-FromEntityHeader: X-MS-Exchange-Transport-CrossTenantHeadersStamped; bh=pQjruqb1wtBHETrS/p6VE2nxbmPA0vX0Bfh3UUsGs4U=; b=SSDkizIQ+Qwq0+I98eMtJv2uFyMNqVtwqpfI4LB7wsazXrzFxtqd6n+lXkCWKFUM2Tib QYiW4aXbvqaaXWviqH0e0Z2I8yfqmWnALEongv53yQJb9lxIAVK94g4mVKSN3ru+yXVdv Ewcz+HD72OJBUcyrYlDq0917yBAeXhSnj4DeNtImoqWanzt9NYj0okbNOuid35fHO+0Lg HNMkNqmzcfZwEukRrEnZzMgzqJymJLW2xJKAD5kZC1jWZOWfFV7iRS25c6mArzYaVmyXb 2dhLdofQDaB4EmrwMj7l/GBQ0OQ+6EVsOFYCBUFwuOsFYLhTZZvyCte74LWnJV6dXIQ== ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=none header.from=cixtech.com; spf=pass smtp.mailfrom=cixtech.com; arc=pass header.oldest-pass=0 smtp.remote-ip=52.101.126.127 Received: from TYPPR03CU001.outbound.protection.outlook.com (mail-japaneastazon11022127.outbound.protection.outlook.com [52.101.126.127]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (secp384r1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E18B606D816; Mon, 9 Nov 2026 09:24:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 9E18B606D816 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=cixtech.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cixtech.com ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Li4ewb4/jWcfWlwH20nTfQTgLdB+h1rEALCNLsOFx/vn1kVBB3aruHTE3zb5/KgokCgRDJKNM9SDwQTuCnsvXZgI6oFRlmaRSKFa8uBMFlJLShXklhOFAcvxBXekrgE9KExLFIb9Eh41CNcka7oFJn5VR74muiqX5rD7sdqzsodeArAYQVG8ZUW7yjo7jPMzKwSLZYLlvx9lwnZgXvp/8haMbxifsutjPTF78nZrWmTcYnAb/K4Q/a93YT7V54K/KeWMy5S4/gtdUluw7fVuTSmg0uoAR9KawKmc7rE4stFbV4/I9TKc3mOgOWKCWSRKBsCSFPNUR4J2cTlCH0pFOw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=pQjruqb1wtBHETrS/p6VE2nxbmPA0vX0Bfh3UUsGs4U=; b=J11oMUPMi75OUe9BrvXIDmLWAcx5OkDvh2q1my3pb9HSJVz2Zo8Oh9NCnaYjOlCY89PeY1IIxqsno7FvvgrXLHzSRVbARIVY8UHF5Cd6LBW9vWtVuW5/Vk88vD1TbUplgEqhQDbP8/ReVktL9mjj5mPqJdFuBgHmsu9v/c6ODTj8Tj/1mJr32wbRAMdow1YIt4D0YYvhHBtd/mJ3TPJzxs8govhPpCNRyEb97/ctHt26rLneAcmrAMYIU9AqcpZTpxYA5KxPGZTFGzMAmd1ls4ADmL3G3QqDVTL/hldtyWGj+JrBvTv/TBS8aUl8nwu6GA4PP+E5vmRjxlmuMlDQag== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 222.71.101.198) smtp.rcpttodomain=cixtech.com smtp.mailfrom=cixtech.com; dmarc=bestguesspass action=none header.from=cixtech.com; dkim=none (message not signed); arc=none (0) Received: from SI2PR06CA0017.apcprd06.prod.outlook.com (2603:1096:4:186::15) by KL1PR06MB6591.apcprd06.prod.outlook.com (2603:1096:820:f8::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.615.7; Mon, 9 Nov 2026 09:24:01 +0000 Received: from SG1PEPF000082E8.apcprd02.prod.outlook.com (2603:1096:4:186:cafe::6f) by SI2PR06CA0017.outlook.office365.com (2603:1096:4:186::15) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.21.592.13 via Frontend Transport; Mon, 9 Nov 2026 09:24:01 +0000 X-MS-Exchange-Authentication-Results: mx.microsoft.com 1; spf=pass (sender IP is 222.71.101.198) smtp.mailfrom=cixtech.com; dkim=none (message not signed) header.d=none;dmarc=bestguesspass action=none header.from=cixtech.com; Received-SPF: Pass (protection.outlook.com: domain of cixtech.com designates 222.71.101.198 as permitted sender) receiver=protection.outlook.com; client-ip=222.71.101.198; helo=smtprelay.cixcomputing.com; pr=C Received: from smtprelay.cixcomputing.com (222.71.101.198) by SG1PEPF000082E8.mail.protection.outlook.com (10.167.240.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.615.4 via Frontend Transport; Mon, 9 Nov 2026 09:24:01 +0000 Received: from gary-System-Product-Name (unknown [172.16.64.55]) by smtprelay.cixcomputing.com (Postfix) with ESMTPSA id 70B6F40920EB; Mon, 9 Nov 2026 17:24:00 +0800 (CST) From: Gary Yang To: Heikki Krogerus , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Fugang Duan Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, cix-kernel-upstream@cixtech.com, gary.yang@cixtech.com Subject: [PATCH v2 2/2] usb: typec: add CIX Type-C PD controller driver Date: Mon, 9 Nov 2026 17:24:00 +0800 Message-ID: <20261109092400.202219-3-gary.yang@cixtech.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20261109092400.202219-1-gary.yang@cixtech.com> References: <20261109092400.202219-1-gary.yang@cixtech.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SG1PEPF000082E8:EE_|KL1PR06MB6591:EE_ Content-Type: text/plain X-MS-Office365-Filtering-Correlation-Id: 9070b425-1058-4f76-7352-08df3e4330d7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|36860700016|1800799024|82310400026|5023799004|56012099006|261021135927099003|261021121427099003|261022075727099003|261022105027099003|261009223027099003|261026140227099003|261028144727099003|261026121527099003|261102123227099003|10067099003|18092099006|18002099003|22082099003|6133799003|3023799007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:222.71.101.198;CTRY:CN;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:smtprelay.cixcomputing.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(23010399003)(376014)(36860700016)(1800799024)(82310400026)(5023799004)(56012099006)(261021135927099003)(261021121427099003)(261022075727099003)(261022105027099003)(261009223027099003)(261026140227099003)(261028144727099003)(261026121527099003)(261102123227099003)(10067099003)(18092099006)(18002099003)(22082099003)(6133799003)(3023799007);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Tf/Q1cNG+80f2PQtlOV5bN+8kJIkul1OrBBEj566uU7StIPwLQN6N4lkiS1XwcUU/mkSJhtBjuXTw2wIY+AtSVuOEZYgBEHZPJdgBO5dfw7qb73eCV3/+AGubrixjrjBayFJppe4PxFL4qUw0DJMhyiZv6gYYOMHCh1R55BJB649RTSkTKZRlgJKX1Z4WUdDlwnrOvgdigllUKCi6bt680gKPeeDu1U+0zu8kX4YwWPeuESOm79abq6lXsgEFtygw5DJzqF/Z05ov/0P3C1L3TMluNit8sQsesnQrsqzfj7XRYkaP/gVn0MsKOVjVU+wBdpiBnK2krFQXc1Seg9Lh06wD863TA8ghdk3eUhGs9fCSCdMuDMmcaQYG9X7RVseLyEIqgkjLUfy2QNEgPwlz32Bmv/XtL2NZSD/gmgWe01ZszVjuXk6xSgpucl5y2kv X-OriginatorOrg: cixtech.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Nov 2026 09:24:01.0727 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9070b425-1058-4f76-7352-08df3e4330d7 X-MS-Exchange-CrossTenant-Id: 0409f77a-e53d-4d23-943e-ccade7cb4811 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=0409f77a-e53d-4d23-943e-ccade7cb4811;Ip=[222.71.101.198];Helo=[smtprelay.cixcomputing.com] X-MS-Exchange-CrossTenant-AuthSource: SG1PEPF000082E8.apcprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: KL1PR06MB6591 Add a driver for the CIX Type-C PD controller, which is connected over I2C and reports power, data and plug orientation changes through a level-triggered interrupt. The Realtek RTS5453H is the first supported device. The controller runs the Type-C and PD state machines in firmware and exposes the current port status over I2C. The driver translates that into Type-C class notifications, driving the orientation switch and mode mux registered by the platform PHY for the DisplayPort alternate mode. It also drives the platform USB role switch so that the USB controller follows the negotiated data role. Several controller instances can share a single interrupt line, so each instance registers a handler on it with IRQF_SHARED and only accesses its own registers. The driver is named after the CIX platform integration rather than the RTS5453H so that further register-compatible PD controllers can be supported without renaming it. Signed-off-by: Gary Yang --- MAINTAINERS | 7 + drivers/usb/typec/Kconfig | 13 + drivers/usb/typec/Makefile | 1 + drivers/usb/typec/cix_pd.c | 687 +++++++++++++++++++++++++++++++++++++ 4 files changed, 708 insertions(+) create mode 100644 drivers/usb/typec/cix_pd.c diff --git a/MAINTAINERS b/MAINTAINERS index 93abbb315065..bd99313bf91d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6522,6 +6522,13 @@ M: Satish Kharat S: Supported F: drivers/infiniband/hw/usnic/ +CIX USB TYPE-C PD CONTROLLER +M: Gary Yang +L: linux-usb@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/usb/realtek,rts5453h.yaml +F: drivers/usb/typec/cix_pd.c + CLANG CONTEXT ANALYSIS M: Marco Elver R: Bart Van Assche diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig index 2f80c2792dbd..4d62f5deeeba 100644 --- a/drivers/usb/typec/Kconfig +++ b/drivers/usb/typec/Kconfig @@ -110,6 +110,19 @@ config TYPEC_WUSB3801 If you choose to build this driver as a dynamically linked module, the module will be called wusb3801.ko. +config TYPEC_CIX_PD + tristate "CIX Type-C PD controller driver" + depends on I2C + depends on USB_ROLE_SWITCH + depends on ARCH_CIX || COMPILE_TEST + select REGMAP_I2C + help + Say Y or M here if your system has a CIX Type-C PD controller. + This driver currently supports the Realtek RTS5453H controller. + + If you choose to build this driver as a dynamically linked module, the + module will be called cix_pd.ko. + source "drivers/usb/typec/mux/Kconfig" source "drivers/usb/typec/altmodes/Kconfig" diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile index 8a6a1c663eb6..bb3f3139fd7e 100644 --- a/drivers/usb/typec/Makefile +++ b/drivers/usb/typec/Makefile @@ -11,4 +11,5 @@ obj-$(CONFIG_TYPEC_HD3SS3220) += hd3ss3220.o obj-$(CONFIG_TYPEC_STUSB160X) += stusb160x.o obj-$(CONFIG_TYPEC_RT1719) += rt1719.o obj-$(CONFIG_TYPEC_WUSB3801) += wusb3801.o +obj-$(CONFIG_TYPEC_CIX_PD) += cix_pd.o obj-$(CONFIG_TYPEC) += mux/ diff --git a/drivers/usb/typec/cix_pd.c b/drivers/usb/typec/cix_pd.c new file mode 100644 index 000000000000..30c879f976c2 --- /dev/null +++ b/drivers/usb/typec/cix_pd.c @@ -0,0 +1,687 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2025 Cix Technology Group Co., Ltd. + * + * Driver for the CIX Type-C PD controller. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RTS_DATA_CONTROL 0x50 +#define I2C_INT_ACK_BIT BIT(2) +#define HPD_IRQ_ACK BIT(5) +#define RTS_DATA_STATUS 0x5F +/* byte 1 */ +#define CONNECTION_ORIENTATION BIT(1) +#define USB2_CONNECTION BIT(4) +#define USB3_2_CONNECTION BIT(5) +#define USB_DATA_ROLE BIT(7) +/* byte 2 */ +#define DP_CONNECTION BIT(0) +#define DP_SOURCE_SINK BIT(1) +#define DEBUG_ACCESSORY_ATTACHED BIT(4) +#define HPD_IRQ BIT(6) +#define HPD_STATE BIT(7) +/* byte 3 */ +#define POWER_SOURCE BIT(0) +#define POWER_SINK BIT(1) +#define POWER_MASK 3 + +#define DATA_STATUS_COUNT 6 + +struct cix_pd { + struct device *dev; + struct regmap *regmap; + struct mutex lock; /* device lock */ + struct mutex irq_lock; /* protects IRQ state transitions */ + int id; + int irq; + u8 data_status[DATA_STATUS_COUNT]; + struct typec_displayport_data dp_data; + struct typec_mux_state state; + struct typec_capability caps; + struct typec_mux *mux; + struct usb_role_switch *role_sw; + struct typec_altmode *port_altmode; + struct typec_altmode *partner_altmode; + struct typec_port *port; + enum usb_role role; + unsigned long mode; + u32 hpd_status; + struct typec_partner *partner; + struct typec_partner_desc desc; + bool wake_enabled; +}; + +static int cix_pd_block_read(struct cix_pd *rts, u8 reg, void *val, size_t len) +{ + return regmap_bulk_read(rts->regmap, reg, val, len); +} + +static int cix_pd_block_write(struct cix_pd *rts, u8 reg, + const void *val, size_t len) +{ + return regmap_bulk_write(rts->regmap, reg, val, len); +} + +static const struct regmap_config cix_pd_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x7F, +}; + +static const char *const dp_only_mode = "Alt Mode:DP"; +static const char *const dp_usb_mode = "Alt Mode:DP + USB"; +static const char *const usb_mode = "Alt Mode:USB"; + +static const char *const power_source = "power source"; +static const char *const power_sink = "power sink"; + +static const char *const orientation_normal = "orientation normal"; +static const char *const orientation_reverse = "orientation reverse"; + +static const char *const data_host = "usb host"; +static const char *const data_device = "usb device"; + +static const char *cix_pd_pwr_role_str(const struct cix_pd *rts) +{ + switch (rts->data_status[3] & POWER_MASK) { + case POWER_SOURCE: + return power_source; + case POWER_SINK: + return power_sink; + default: + return "unknown"; + } +} + +/* + * The controller negotiates the DisplayPort alternate mode autonomously, + * so the capabilities below describe the fixed set supported by the + * platform DP output: a receptacle exposing DFP_D with pin assignments + * C, D and E. + */ +#define CIX_PD_DP_PIN_ASSIGN (BIT(DP_PIN_ASSIGN_C) | BIT(DP_PIN_ASSIGN_D) | \ + BIT(DP_PIN_ASSIGN_E)) + +static const struct typec_altmode_desc cix_pd_dp_port_altmode = { + .svid = USB_TYPEC_DP_SID, + .mode = USB_TYPEC_DP_MODE, + .vdo = DP_CAP_DFP_D | DP_CAP_RECEPTACLE | + (CIX_PD_DP_PIN_ASSIGN << 8), +}; + +static const struct typec_altmode_desc cix_pd_dp_partner_altmode = { + .svid = USB_TYPEC_DP_SID, + .mode = USB_TYPEC_DP_MODE, + .vdo = DP_CAP_UFP_D | DP_CAP_RECEPTACLE | + (CIX_PD_DP_PIN_ASSIGN << 16), + .mode_selection = true, +}; + +static int cix_pd_typec_port_update(struct cix_pd *typec) +{ + struct typec_displayport_data *dp_data = &typec->dp_data; + enum typec_orientation orientation; + enum usb_role role; + bool usb2, usb3, dp, connected; + int ret, err; + + usb2 = typec->data_status[1] & USB2_CONNECTION; + usb3 = typec->data_status[1] & USB3_2_CONNECTION; + dp = typec->data_status[2] & DP_CONNECTION; + + /* + * Debug accessories are not supported, so they are reported as + * disconnected instead of being passed on to the framework. + */ + if (typec->data_status[2] & DEBUG_ACCESSORY_ATTACHED) { + dev_err(typec->dev, + "debug accessory mode not supported, try another usb cable\n"); + connected = false; + } else { + connected = usb2 || usb3 || dp; + } + + if (!connected) + orientation = TYPEC_ORIENTATION_NONE; + else if (typec->data_status[1] & CONNECTION_ORIENTATION) + orientation = TYPEC_ORIENTATION_REVERSE; + else + orientation = TYPEC_ORIENTATION_NORMAL; + + ret = typec_set_orientation(typec->port, orientation); + if (ret) + return ret; + + if (!connected || !(usb2 || usb3)) + role = USB_ROLE_NONE; + else if (typec->data_status[1] & USB_DATA_ROLE) + role = USB_ROLE_DEVICE; + else + role = USB_ROLE_HOST; + + if (typec->role != role) { + err = 0; + if (typec->role_sw) { + err = usb_role_switch_set_role(typec->role_sw, role); + if (err) + dev_err(typec->dev, + "typec port(%d): failed to set USB role: %d\n", + typec->id, err); + } + + /* Only cache the role once the switch accepted it. */ + if (!err) { + typec->role = role; + if (role == USB_ROLE_DEVICE) + typec_set_data_role(typec->port, TYPEC_DEVICE); + else if (role == USB_ROLE_HOST) + typec_set_data_role(typec->port, TYPEC_HOST); + } + } + + if ((typec->data_status[3] & POWER_MASK) == POWER_SOURCE) { + typec_set_pwr_role(typec->port, TYPEC_SOURCE); + } else if ((typec->data_status[3] & POWER_MASK) == POWER_SINK) { + typec_set_pwr_role(typec->port, TYPEC_SINK); + } else { + dev_dbg(typec->dev, "typec port(%d): unknown power state %d\n", + typec->id, typec->data_status[3]); + } + + if (!connected) { + if (typec->partner_altmode) { + typec_altmode_update_active(typec->partner_altmode, + false); + typec_unregister_altmode(typec->partner_altmode); + typec->partner_altmode = NULL; + } + if (typec->partner) { + dev_info(typec->dev, "typec port(%d): unregister partner\n", + typec->id); + typec_unregister_partner(typec->partner); + typec->partner = NULL; + } + } else { + if (!typec->partner) { + dev_info(typec->dev, "typec port(%d): register partner\n", + typec->id); + typec->partner = typec_register_partner(typec->port, + &typec->desc); + if (IS_ERR(typec->partner)) { + dev_err(typec->dev, + "typec port(%d): failed to register partner: %ld\n", + typec->id, PTR_ERR(typec->partner)); + typec->partner = NULL; + } + } + + if (typec->partner_altmode && !dp) { + typec_altmode_update_active(typec->partner_altmode, + false); + typec_unregister_altmode(typec->partner_altmode); + typec->partner_altmode = NULL; + } + + if (typec->partner && dp && !typec->partner_altmode) { + typec->partner_altmode = + typec_partner_register_altmode(typec->partner, + &cix_pd_dp_partner_altmode); + if (IS_ERR(typec->partner_altmode)) { + dev_err(typec->dev, + "typec port(%d): failed to register DP altmode: %ld\n", + typec->id, + PTR_ERR(typec->partner_altmode)); + typec->partner_altmode = NULL; + } else { + typec_altmode_update_active(typec->partner_altmode, + true); + } + } + } + + dp_data->status = 0; + typec->state.data = NULL; + typec->state.alt = NULL; + + /* + * Only pass a DisplayPort state to the mux when the alternate mode + * was registered successfully; the state points at it. + */ + if (connected && dp && typec->partner_altmode) { + dp_data->status = DP_STATUS_ENABLED; + if (typec->data_status[2] & HPD_STATE) + dp_data->status |= DP_STATUS_HPD_STATE; + if (typec->data_status[2] & HPD_IRQ) + dp_data->status |= DP_STATUS_IRQ_HPD; + + typec->state.data = dp_data; + typec->state.alt = typec->partner_altmode; + typec->state.mode = usb3 ? TYPEC_DP_STATE_D : + TYPEC_DP_STATE_E; + } else if (connected && (usb2 || usb3)) { + typec->state.mode = TYPEC_STATE_USB; + } else { + typec->state.mode = TYPEC_STATE_SAFE; + } + + ret = typec_mux_set(typec->mux, &typec->state); + if (ret) + return ret; + + if (typec->mode == typec->state.mode && + typec->hpd_status == dp_data->status) + return 0; + + if (typec->state.mode == TYPEC_DP_STATE_D) + dev_info(typec->dev, + "typec port(%d): alt mode(%s) orientation(%s), usb_data_role(%s), power role(%s), hpd_state(%d)\n", + typec->id, dp_usb_mode, + orientation == TYPEC_ORIENTATION_REVERSE ? + orientation_reverse : orientation_normal, + role == USB_ROLE_DEVICE ? data_device : data_host, + cix_pd_pwr_role_str(typec), + (int)(dp_data->status & DP_STATUS_HPD_STATE)); + else if (typec->state.mode == TYPEC_DP_STATE_E) + dev_info(typec->dev, + "typec port(%d): alt mode(%s) orientation(%s), power role(%s), hpd_state(%d)\n", + typec->id, dp_only_mode, + orientation == TYPEC_ORIENTATION_REVERSE ? + orientation_reverse : orientation_normal, + cix_pd_pwr_role_str(typec), + (int)(dp_data->status & DP_STATUS_HPD_STATE)); + else if (typec->state.mode == TYPEC_STATE_USB) + dev_info(typec->dev, + "typec port(%d): alt mode(%s) orientation(%s), power role(%s), usb_data_role(%s)\n", + typec->id, usb_mode, + orientation == TYPEC_ORIENTATION_REVERSE ? + orientation_reverse : orientation_normal, + cix_pd_pwr_role_str(typec), + role == USB_ROLE_DEVICE ? data_device : data_host); + else if (typec->state.mode == TYPEC_STATE_SAFE) + dev_info(typec->dev, "typec port(%d): disconnect state\n", + typec->id); + + typec->mode = typec->state.mode; + typec->hpd_status = dp_data->status; + + return 0; +} + +static void cix_pd_typec_init_state(struct cix_pd *typec) +{ + typec->state.alt = NULL; + typec->state.mode = TYPEC_STATE_SAFE; + typec->state.data = NULL; + typec->partner = NULL; + typec->desc.accessory = TYPEC_ACCESSORY_NONE; + /* + * The data status registers only report the source/sink state, not + * whether USB PD is being used, so the partner is not advertised as + * PD capable. + */ + typec->desc.usb_pd = 0; +} + +static int cix_pd_event_handler(struct cix_pd *rts, u8 clear_irq) +{ + int ret, err = 0; + u8 data_control[3] = {0}; + + mutex_lock(&rts->lock); + if (clear_irq) { + data_control[0] = 2; + data_control[1] = I2C_INT_ACK_BIT; + data_control[2] = 0; + + ret = cix_pd_block_write(rts, RTS_DATA_CONTROL, data_control, 3); + if (ret) + goto i2c_err; + } + + ret = cix_pd_block_read(rts, RTS_DATA_STATUS, rts->data_status, 6); + if (ret) + goto i2c_err; + + dev_dbg(rts->dev, + "typec port(%d): data status = 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", + rts->id, rts->data_status[0], rts->data_status[1], + rts->data_status[2], rts->data_status[3], rts->data_status[4], + rts->data_status[5]); + + err = cix_pd_typec_port_update(rts); + if (err) + dev_err(rts->dev, "typec port(%d): failed to update port: %d\n", + rts->id, err); + + if (rts->data_status[2] & HPD_IRQ) { + data_control[0] = 2; + data_control[1] = 0; + data_control[2] = HPD_IRQ_ACK; + ret = cix_pd_block_write(rts, RTS_DATA_CONTROL, data_control, 3); + if (ret) + goto i2c_err; + } + + mutex_unlock(&rts->lock); + return err; + +i2c_err: + /* + * Report the controller as unresponsive; the IRQ handler turns this + * into IRQ_NONE so a stuck line is throttled by the IRQ core. + */ + dev_err(rts->dev, "typec port(%d): i2c transfer error = %d\n", + rts->id, ret); + mutex_unlock(&rts->lock); + return -ESHUTDOWN; +} + +static int cix_pd_typec_parse_port_props(struct typec_capability *cap, + struct fwnode_handle *fwnode, + struct device *dev) +{ + int ret; + + memset(cap, 0, sizeof(*cap)); + ret = typec_get_fw_cap(cap, fwnode); + if (ret) + return dev_err_probe(dev, ret, + "failed to parse connector properties\n"); + + cap->fwnode = fwnode_handle_get(fwnode); + cap->orientation_aware = true; + /* Alternate modes are entered and exited by the controller firmware. */ + cap->no_mode_control = true; + + return 0; +} + +static int cix_pd_typec_get_handles(struct cix_pd *typec, + struct fwnode_handle *fwnode, + struct device *dev) +{ + int ret; + + typec->mux = fwnode_typec_mux_get(fwnode); + if (IS_ERR(typec->mux)) + return dev_err_probe(dev, PTR_ERR(typec->mux), + "failed to get mux\n"); + + typec->role_sw = fwnode_usb_role_switch_get(fwnode); + if (IS_ERR(typec->role_sw)) { + ret = PTR_ERR(typec->role_sw); + typec->role_sw = NULL; + + /* The role switch is optional. */ + if (ret != -ENODEV) { + typec_mux_put(typec->mux); + typec->mux = NULL; + return dev_err_probe(dev, ret, + "failed to get USB role switch\n"); + } + } + + if (!typec->mux) + dev_dbg(dev, "mux not found\n"); + + return 0; +} + +static void cix_pd_unregister_ports(struct cix_pd *typec) +{ + if (!IS_ERR_OR_NULL(typec->port)) { + typec->state.alt = NULL; + typec->state.mode = TYPEC_STATE_SAFE; + typec->state.data = NULL; + usb_role_switch_set_role(typec->role_sw, USB_ROLE_NONE); + typec_set_orientation(typec->port, TYPEC_ORIENTATION_NONE); + typec_mux_set(typec->mux, &typec->state); + + if (typec->partner_altmode) + typec_altmode_update_active(typec->partner_altmode, + false); + typec_unregister_altmode(typec->partner_altmode); + typec->partner_altmode = NULL; + typec_unregister_partner(typec->partner); + typec->partner = NULL; + typec_unregister_altmode(typec->port_altmode); + typec->port_altmode = NULL; + + typec_unregister_port(typec->port); + typec->port = NULL; + } + + usb_role_switch_put(typec->role_sw); + typec->role_sw = NULL; + typec_mux_put(typec->mux); + typec->mux = NULL; + fwnode_handle_put(typec->caps.fwnode); + typec->caps.fwnode = NULL; +} + +static irqreturn_t cix_pd_irq_handle(int irq, void *data) +{ + struct cix_pd *rts = data; + + if (cix_pd_event_handler(rts, 1) == -ESHUTDOWN) + return IRQ_NONE; + + return IRQ_HANDLED; +} + +static int cix_pd_init_ports(struct cix_pd *typec) +{ + struct device *dev = typec->dev; + struct typec_altmode_desc desc = cix_pd_dp_port_altmode; + struct fwnode_handle *fwnode; + int ret; + + fwnode = device_get_named_child_node(dev, "connector"); + if (!fwnode) + return dev_err_probe(dev, -ENODEV, "no connector node found\n"); + + ret = cix_pd_typec_get_handles(typec, fwnode, dev); + if (ret) + goto out_put_fwnode; + + ret = cix_pd_typec_parse_port_props(&typec->caps, fwnode, dev); + if (ret) + goto out_unregister_ports; + + typec->port = typec_register_port(dev, &typec->caps); + if (IS_ERR(typec->port)) { + ret = PTR_ERR(typec->port); + typec->port = NULL; + dev_err_probe(dev, ret, "failed to register port\n"); + goto out_unregister_ports; + } + + desc.roles = typec->caps.data; + typec->port_altmode = typec_port_register_altmode(typec->port, &desc); + if (IS_ERR(typec->port_altmode)) { + ret = PTR_ERR(typec->port_altmode); + typec->port_altmode = NULL; + dev_err_probe(dev, ret, "failed to register DP altmode\n"); + goto out_unregister_ports; + } + + fwnode_handle_put(fwnode); + + return 0; + +out_unregister_ports: + cix_pd_unregister_ports(typec); +out_put_fwnode: + fwnode_handle_put(fwnode); + return ret; +} + +static int cix_pd_probe(struct i2c_client *client) +{ + struct cix_pd *rts; + int ret; + + rts = devm_kzalloc(&client->dev, sizeof(*rts), GFP_KERNEL); + if (!rts) + return -ENOMEM; + + rts->dev = &client->dev; + rts->irq = client->irq; + mutex_init(&rts->lock); + mutex_init(&rts->irq_lock); + cix_pd_typec_init_state(rts); + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) + return dev_err_probe(&client->dev, -ENODEV, + "i2c check functionality failed\n"); + + rts->regmap = devm_regmap_init_i2c(client, &cix_pd_regmap_config); + if (IS_ERR(rts->regmap)) + return dev_err_probe(&client->dev, PTR_ERR(rts->regmap), + "failed to init regmap\n"); + + i2c_set_clientdata(client, rts); + rts->id = client->addr; + + ret = cix_pd_init_ports(rts); + if (ret) + return ret; + + ret = cix_pd_event_handler(rts, 0); + if (ret) { + dev_err(&client->dev, "failed to read initial status: %d\n", ret); + if (ret == -ESHUTDOWN) + ret = -EIO; + goto err_unregister_ports; + } + + if (client->irq > 0) { + ret = request_threaded_irq(client->irq, NULL, cix_pd_irq_handle, + IRQF_SHARED | IRQF_ONESHOT, + dev_name(&client->dev), rts); + if (ret) { + dev_err(&client->dev, "failed to request irq: %d\n", ret); + goto err_unregister_ports; + } + } + + device_set_wakeup_capable(&client->dev, true); + + return 0; + +err_unregister_ports: + cix_pd_unregister_ports(rts); + return ret; +} + +static void cix_pd_remove(struct i2c_client *client) +{ + struct cix_pd *rts = i2c_get_clientdata(client); + + if (rts->irq > 0) { + if (rts->wake_enabled) { + disable_irq_wake(rts->irq); + rts->wake_enabled = false; + } + free_irq(rts->irq, rts); + } + + cix_pd_unregister_ports(rts); +} + +static const struct of_device_id cix_pd_of_match[] = { + { .compatible = "realtek,rts5453h", }, + {} +}; +MODULE_DEVICE_TABLE(of, cix_pd_of_match); + +static const struct i2c_device_id cix_pd_id[] = { + { .name = "rts5453h" }, + {} +}; +MODULE_DEVICE_TABLE(i2c, cix_pd_id); + +static int __maybe_unused cix_pd_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct cix_pd *rts = i2c_get_clientdata(client); + + if (client->irq > 0 && device_may_wakeup(dev)) { + mutex_lock(&rts->irq_lock); + if (!rts->wake_enabled) { + enable_irq_wake(client->irq); + rts->wake_enabled = true; + } + mutex_unlock(&rts->irq_lock); + } + + return 0; +} + +static int __maybe_unused cix_pd_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct cix_pd *rts = i2c_get_clientdata(client); + int ret; + + mutex_lock(&rts->irq_lock); + if (rts->wake_enabled) { + disable_irq_wake(client->irq); + rts->wake_enabled = false; + } + mutex_unlock(&rts->irq_lock); + + /* Force the USB role to be reprogrammed after system resume. */ + rts->role = USB_ROLE_NONE; + + ret = cix_pd_event_handler(rts, 0); + if (ret) { + dev_err(dev, "failed to refresh status: %d\n", ret); + if (ret == -ESHUTDOWN) + ret = -EIO; + } + + return ret; +} + +static const struct dev_pm_ops cix_pd_pm_ops = { + .suspend = pm_sleep_ptr(cix_pd_suspend), + .resume = pm_sleep_ptr(cix_pd_resume), + .freeze = pm_sleep_ptr(cix_pd_suspend), + .thaw = pm_sleep_ptr(cix_pd_resume), + .poweroff = pm_sleep_ptr(cix_pd_suspend), + .restore = pm_sleep_ptr(cix_pd_resume), +}; + +static struct i2c_driver cix_pd_i2c_driver = { + .driver = { + .name = "rts5453h", + .of_match_table = cix_pd_of_match, + .pm = pm_ptr(&cix_pd_pm_ops), + }, + .id_table = cix_pd_id, + .probe = cix_pd_probe, + .remove = cix_pd_remove, +}; + +module_i2c_driver(cix_pd_i2c_driver); +MODULE_DESCRIPTION("CIX Type-C PD controller driver"); +MODULE_AUTHOR("Chao Zeng "); +MODULE_AUTHOR("Gary Yang "); +MODULE_LICENSE("GPL"); -- 2.50.1