From patchwork Fri Jan 14 16:39:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Anderson X-Patchwork-Id: 12713839 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 030EAC433EF for ; Fri, 14 Jan 2022 16:40:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239364AbiANQkU (ORCPT ); Fri, 14 Jan 2022 11:40:20 -0500 Received: from mail-db8eur05on2045.outbound.protection.outlook.com ([40.107.20.45]:63713 "EHLO EUR05-DB8-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S236457AbiANQkT (ORCPT ); Fri, 14 Jan 2022 11:40:19 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=PsNuawV0CU++UoLdK6nQoHuOLnR+AR5l7XgoBhbTsOuOUqNhD/V6QQKz7hEjZBCpNZKbxIWXKOD/mjPnX0vnkYjlGSvTcqMIEwsH8FaQwRKd9S28pOoyEv/gKu36qlq6HzQhD2tfEMLylms1fGTT8QNtdPEmO39BEJgL+ABC6vzzByYeadXty2TtHtnFZpl1GzFySNEiBJufPTXK0vFyhhqM9xMn61NilKz91/uuy1pmykTeerDZ/lYyOXBl7mkBPzqqLgTq1AaTHmP7Ba0onwX4DN5+TlnyFEAh/cfdiV8a8WMp+pMOqRlVRP6ZOnb2yfXe4Re0AwAlnv6I7IRNZg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=5TtOfKTEI06+FyDYOZxDAqYsImAJxPrsoqL9H1PI+PA=; b=JpxtByylbnNjWJY9YXWzkPDmTQJzDAvQHugfLUwnN6SwxhxBK7P/QLGuhtRGMCcM0pDTOGR33jqab1sS/q2LKycqZ3z7HpwC334kVLOqasVQbnYdd9rbDl279jZyLHV/OKEJrIH4GPyW6prZZoihzNUuPE83eaisOfJQAEjQdRNNH0CVbjJtSr+tMuvdTTJ7cHCaAq3G1MULuuXQbBCD5JfahXUbQzUUe9xeeBjCJej29TcMRfBXj6JFQWHW2n6pZEopGJALrRE0yVPOKLw+WicQv5I/y734iiJM46g6jZ3hDP39nOD2xcYhGonCcUw+VA2QSSQnkYR4zFPxCz9KRw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=seco.com; dmarc=pass action=none header.from=seco.com; dkim=pass header.d=seco.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=seco.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=5TtOfKTEI06+FyDYOZxDAqYsImAJxPrsoqL9H1PI+PA=; b=fM8fWcXun5GiovgaXZWgWsfvGJArh8AqN8bClk0BIfWsJdJCdSeYXPAXOBgSiPuBhVQcLInvqyA6Id9xmqDh/3WDS+N8QwoOn91Gx46c8yBoio9W75tXo6T3/ojLF2xaqGEKQTitcr7s4yeTzKqRS+kci7x1BfIEw47muYEdRIQ= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=seco.com; Received: from DB7PR03MB4523.eurprd03.prod.outlook.com (2603:10a6:10:19::27) by AM6PR03MB3509.eurprd03.prod.outlook.com (2603:10a6:209:2f::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4888.11; Fri, 14 Jan 2022 16:40:17 +0000 Received: from DB7PR03MB4523.eurprd03.prod.outlook.com ([fe80::d47e:81b0:256:3005]) by DB7PR03MB4523.eurprd03.prod.outlook.com ([fe80::d47e:81b0:256:3005%4]) with mapi id 15.20.4888.011; Fri, 14 Jan 2022 16:40:17 +0000 From: Sean Anderson To: Greg Kroah-Hartman , linux-usb@vger.kernel.org Cc: Heikki Krogerus , linux-kernel@vger.kernel.org, Sean Anderson Subject: [PATCH] usb: ulpi: Add debugfs support Date: Fri, 14 Jan 2022 11:39:47 -0500 Message-Id: <20220114163947.790078-1-sean.anderson@seco.com> X-Mailer: git-send-email 2.25.1 X-ClientProxiedBy: BL0PR02CA0133.namprd02.prod.outlook.com (2603:10b6:208:35::38) To DB7PR03MB4523.eurprd03.prod.outlook.com (2603:10a6:10:19::27) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b774ce2b-992c-4f75-2685-08d9d77c8ba1 X-MS-TrafficTypeDiagnostic: AM6PR03MB3509:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:785; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DB7PR03MB4523.eurprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(8676002)(66946007)(8936002)(6512007)(66556008)(86362001)(6506007)(6666004)(52116002)(66476007)(36756003)(5660300002)(1076003)(4326008)(54906003)(44832011)(26005)(107886003)(316002)(508600001)(2616005)(186003)(38100700002)(38350700002)(83380400001)(6486002)(2906002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: seco.com X-MS-Exchange-CrossTenant-Network-Message-Id: b774ce2b-992c-4f75-2685-08d9d77c8ba1 X-MS-Exchange-CrossTenant-AuthSource: DB7PR03MB4523.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jan 2022 16:40:16.9552 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: bebe97c3-6438-442e-ade3-ff17aa50e733 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: A1YdRZJpxDHnaghb9tVcx1Ci1KhB2xWW+ka6XatzmdPv+jKzcLFd5eFkC0PmNtxEmlkvc1LPgcbq7980QLKIJQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR03MB3509 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This adds a debugfs file for ULPI devices which contains a dump of their registers. This is useful for debugging basic connectivity problems. The file is created in ulpi_register because many devices will never have a driver bound (as they are managed in hardware by the USB controller device). Signed-off-by: Sean Anderson --- drivers/usb/common/ulpi.c | 100 ++++++++++++++++++++++++++++++++++-- include/linux/ulpi/driver.h | 3 ++ 2 files changed, 99 insertions(+), 4 deletions(-) diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c index 4169cf40a03b..a39c48e04013 100644 --- a/drivers/usb/common/ulpi.c +++ b/drivers/usb/common/ulpi.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -228,9 +229,64 @@ static int ulpi_read_id(struct ulpi *ulpi) return 0; } +static int __maybe_unused ulpi_regs_read(struct seq_file *seq, void *data) +{ + struct ulpi *ulpi = seq->private; + +#define ulpi_print(name, reg) do { \ + int ret = ulpi_read(ulpi, reg); \ + if (ret < 0) \ + return ret; \ + seq_printf(seq, name " %.02x\n", ret); \ +} while (0) + + ulpi_print("Vendor ID Low ", ULPI_VENDOR_ID_LOW); + ulpi_print("Vendor ID High ", ULPI_VENDOR_ID_HIGH); + ulpi_print("Product ID Low ", ULPI_PRODUCT_ID_LOW); + ulpi_print("Product ID High ", ULPI_PRODUCT_ID_HIGH); + ulpi_print("Function Control ", ULPI_FUNC_CTRL); + ulpi_print("Interface Control ", ULPI_IFC_CTRL); + ulpi_print("OTG Control ", ULPI_OTG_CTRL); + ulpi_print("USB Interrupt Enable Rising ", ULPI_USB_INT_EN_RISE); + ulpi_print("USB Interrupt Enable Falling", ULPI_USB_INT_EN_FALL); + ulpi_print("USB Interrupt Status ", ULPI_USB_INT_STS); + ulpi_print("USB Interrupt Latch ", ULPI_USB_INT_LATCH); + ulpi_print("Debug ", ULPI_DEBUG); + ulpi_print("Scratch Register ", ULPI_SCRATCH); + ulpi_print("Carkit Control ", ULPI_CARKIT_CTRL); + ulpi_print("Carkit Interrupt Delay ", ULPI_CARKIT_INT_DELAY); + ulpi_print("Carkit Interrupt Enable ", ULPI_CARKIT_INT_EN); + ulpi_print("Carkit Interrupt Status ", ULPI_CARKIT_INT_STS); + ulpi_print("Carkit Interrupt Latch ", ULPI_CARKIT_INT_LATCH); + ulpi_print("Carkit Pulse Control ", ULPI_CARKIT_PLS_CTRL); + ulpi_print("Transmit Positive Width ", ULPI_TX_POS_WIDTH); + ulpi_print("Transmit Negative Width ", ULPI_TX_NEG_WIDTH); + ulpi_print("Receive Polarity Recovery ", ULPI_POLARITY_RECOVERY); + + return 0; +} + +static int __maybe_unused ulpi_regs_open(struct inode *inode, struct file *f) +{ + struct ulpi *ulpi = inode->i_private; + + return single_open(f, ulpi_regs_read, ulpi); +} + +static const struct file_operations __maybe_unused ulpi_regs_ops = { + .owner = THIS_MODULE, + .open = ulpi_regs_open, + .release = single_release, + .read = seq_read, + .llseek = seq_lseek +}; + +static struct dentry *ulpi_root = (void *)-EPROBE_DEFER; + static int ulpi_register(struct device *dev, struct ulpi *ulpi) { int ret; + struct dentry *regs; ulpi->dev.parent = dev; /* needed early for ops */ ulpi->dev.bus = &ulpi_bus; @@ -245,16 +301,39 @@ static int ulpi_register(struct device *dev, struct ulpi *ulpi) ret = ulpi_read_id(ulpi); if (ret) - return ret; + goto err_of; ret = device_register(&ulpi->dev); if (ret) - return ret; + goto err_of; + + if (IS_ENABLED(CONFIG_DEBUG_FS)) { + ulpi->root = debugfs_create_dir(dev_name(dev), ulpi_root); + if (IS_ERR(ulpi->root)) { + ret = PTR_ERR(ulpi->root); + goto err_dev; + } + + regs = debugfs_create_file("regs", 0444, ulpi->root, ulpi, + &ulpi_regs_ops); + if (IS_ERR(regs)) { + ret = PTR_ERR(regs); + goto err_debugfs; + } + } dev_dbg(&ulpi->dev, "registered ULPI PHY: vendor %04x, product %04x\n", ulpi->id.vendor, ulpi->id.product); return 0; + +err_debugfs: + debugfs_remove(ulpi->root); +err_dev: + device_unregister(&ulpi->dev); +err_of: + of_node_put(ulpi->dev.of_node); + return ret; } /** @@ -296,8 +375,9 @@ EXPORT_SYMBOL_GPL(ulpi_register_interface); */ void ulpi_unregister_interface(struct ulpi *ulpi) { - of_node_put(ulpi->dev.of_node); + debugfs_remove_recursive(ulpi->root); device_unregister(&ulpi->dev); + of_node_put(ulpi->dev.of_node); } EXPORT_SYMBOL_GPL(ulpi_unregister_interface); @@ -305,13 +385,25 @@ EXPORT_SYMBOL_GPL(ulpi_unregister_interface); static int __init ulpi_init(void) { - return bus_register(&ulpi_bus); + int ret; + + if (IS_ENABLED(CONFIG_DEBUG_FS)) { + ulpi_root = debugfs_create_dir("ulpi", NULL); + if (IS_ERR(ulpi_root)) + return PTR_ERR(ulpi_root); + } + + ret = bus_register(&ulpi_bus); + if (ret) + debugfs_remove(ulpi_root); + return ret; } subsys_initcall(ulpi_init); static void __exit ulpi_exit(void) { bus_unregister(&ulpi_bus); + debugfs_remove(ulpi_root); } module_exit(ulpi_exit); diff --git a/include/linux/ulpi/driver.h b/include/linux/ulpi/driver.h index c7a1810373e3..083ea2d2e873 100644 --- a/include/linux/ulpi/driver.h +++ b/include/linux/ulpi/driver.h @@ -6,6 +6,7 @@ #include +struct dentry; struct ulpi_ops; /** @@ -13,10 +14,12 @@ struct ulpi_ops; * @id: vendor and product ids for ULPI device * @ops: I/O access * @dev: device interface + * @root: root directory for debugfs files */ struct ulpi { struct ulpi_device_id id; const struct ulpi_ops *ops; + struct dentry *root; struct device dev; };