From patchwork Thu Sep 24 01:10:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 11795867 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F0C7F6CB for ; Thu, 24 Sep 2020 01:10:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D42D92145D for ; Thu, 24 Sep 2020 01:10:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="BzV1h/oi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726827AbgIXBKU (ORCPT ); Wed, 23 Sep 2020 21:10:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726466AbgIXBKT (ORCPT ); Wed, 23 Sep 2020 21:10:19 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B60EAC0613CE for ; Wed, 23 Sep 2020 18:10:19 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id d9so823162pfd.3 for ; Wed, 23 Sep 2020 18:10:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=rfxM7/I+KfynMolnQ/7xYwDSvDrAFMXPNgmT9bF/6pc=; b=BzV1h/oiYBaReYrl2BNiTM1mdBn+EvWoeKawFQOP5VHQtBqrSheGrMhEN+zAFSa/5k XiQihU9HJUaXEtM9FYZc7G/skJiwWYlW1T7GRRJ8JHzQT7/7wC4I6gPV6oCWNlX3pcfm bXSJq9CGKtF2C9mxyh/JYUGnitKRvdykjMYf0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=rfxM7/I+KfynMolnQ/7xYwDSvDrAFMXPNgmT9bF/6pc=; b=iaid7Ah0mJdRxSLZBYJ/BJOqqISIREsZx277nA4Yr+auJhw0VERpOs1JLseEPcY9Tp kE41chyBhVt6ZAkQ/rpAoHUzxix4yLAYYNaED/+r71RcKI8ZWQCoCuuHsgWtNdfGFG2F OiQMx0yj9BzP8lS/TrZM7wDTSYfclBcD5BjAxxs4RRBrXK07z+uA1Pz5b7Fc9K8fHpC0 OChKtcqE9tHsOhT/Z8qSGZHhJuF0pjEf5SW5V4nX037yQlNwRo1DE2gOhGeWlPLtS2CP eDeei3UEbPcuDg3qAbpTtRaLV7Ek6zhR/al+9VzOE9RRbNsmlXL/wU6YL9f89BptLa9C DcGA== X-Gm-Message-State: AOAM532n37mdKWMv0nN5dGZkRlfw5Kgw3FUYYmr2Rx6tVEiulZZEF4cZ Pp7uregWS27i9Ucr6nqKd2oEgg== X-Google-Smtp-Source: ABdhPJzPtYjeba5CrOvU5m9qU3CaJVwHEuBdgPcw5qhfUMWoc1MRtoCedROx/cRLP8albttSP2c0sQ== X-Received: by 2002:a65:4984:: with SMTP id r4mr1877304pgs.261.1600909817418; Wed, 23 Sep 2020 18:10:17 -0700 (PDT) Received: from localhost ([2620:15c:202:1:f693:9fff:fef4:e70a]) by smtp.gmail.com with ESMTPSA id z129sm875711pgb.84.2020.09.23.18.10.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Sep 2020 18:10:16 -0700 (PDT) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Rob Herring , Frank Rowand Cc: linux-usb@vger.kernel.org, Douglas Anderson , Bastien Nocera , Ravi Chandra Sadineni , Peter Chen , Krzysztof Kozlowski , Alan Stern , devicetree@vger.kernel.org, Stephen Boyd , linux-kernel@vger.kernel.org, Matthias Kaehlcke Subject: [PATCH v3 1/2] dt-bindings: usb: Add binding for discrete onboard USB hubs Date: Wed, 23 Sep 2020 18:10:11 -0700 Message-Id: <20200923180952.v3.1.I248292623d3d0f6a4f0c5bc58478ca3c0062b49a@changeid> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Discrete onboard USB hubs (an example for such a hub is the Realtek RTS5411) need to be powered and may require initialization of other resources (like GPIOs or clocks) to work properly. This adds a device tree binding for these hubs. Signed-off-by: Matthias Kaehlcke --- Changes in v3: - updated commit message - removed recursive reference to $self - adjusted 'compatible' definition to support multiple entries - changed USB controller phandle to be a node Changes in v2: - removed 'wakeup-source' and 'power-off-in-suspend' properties - consistently use spaces for indentation in example .../bindings/usb/onboard_usb_hub.yaml | 54 +++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml diff --git a/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml new file mode 100644 index 000000000000..c9783da3e75c --- /dev/null +++ b/Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml @@ -0,0 +1,54 @@ +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/usb/onboard_usb_hub.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Binding for onboard USB hubs + +maintainers: + - Matthias Kaehlcke + +properties: + compatible: + items: + - enum: + - realtek,rts5411 + - const: onboard-usb-hub + + vdd-supply: + description: + phandle to the regulator that provides power to the hub. + +required: + - compatible + - vdd-supply + +examples: + - | + usb_hub: usb-hub { + compatible = "realtek,rts5411", "onboard-usb-hub"; + vdd-supply = <&pp3300_hub>; + }; + + usb_controller { + dr_mode = "host"; + #address-cells = <1>; + #size-cells = <0>; + + /* 2.0 hub on port 1 */ + hub@1 { + compatible = "usbbda,5411"; + reg = <1>; + hub = <&usb_hub>; + }; + + /* 3.0 hub on port 2 */ + hub@2 { + compatible = "usbbda,411"; + reg = <2>; + hub = <&usb_hub>; + }; + }; + +... From patchwork Thu Sep 24 01:10:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Kaehlcke X-Patchwork-Id: 11795869 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5FAB1112E for ; Thu, 24 Sep 2020 01:10:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 373202223E for ; Thu, 24 Sep 2020 01:10:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="PlCuIp3X" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726890AbgIXBKZ (ORCPT ); Wed, 23 Sep 2020 21:10:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726893AbgIXBKW (ORCPT ); Wed, 23 Sep 2020 21:10:22 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C316AC0613D1 for ; Wed, 23 Sep 2020 18:10:21 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id a9so726646pjg.1 for ; Wed, 23 Sep 2020 18:10:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=8Rd62Oc3gzgsuejUMQ4/DvKo81vT+v7RQmibTThDe6s=; b=PlCuIp3XhcrdDE7p4c1/HsA1cIdVxyK4EMXG/v9gweeq3/ritZ/iqR1fxCdeUOHNyL 6AKU/m1UXR5pe7dzSon+ghGukqr5Wk0hPSt6nnfIa809CutlWA/lT9+d38PihVeIGE4X 717/6qyiua72ptNUwtCNpWWEeMWfEkhN1p+So= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=8Rd62Oc3gzgsuejUMQ4/DvKo81vT+v7RQmibTThDe6s=; b=NsfY5pciQEcEE4qhCCmnbCldoHsTkK9DoIf2uXOF5pbTsUNHUozHOPaeT30jRqgvGN 5quzdRzvZ2uRtmsmyF3H5BNMrAfRduvRBaG4xZsUmRwFxpaApkMyceyRyt5tDXwrqnA5 bI7mcVCL3PYqaorQ0yeZLppQczdnEkWGDNNTmoU2PGssCjGWLv3WCm7QBFKzb1oI13+a 4Ru9IoAh0Na+jC2HaYgJLB15jDuevw6r8LXbgI4OwVQ8B375V3fH3wZda0KmbhssHfKR gTqOILiU5tnvPJ01KJXUBbalS1wLMVuzexg7J8irRfMvIl7zv3NjsZZvY2RlhpfazbYG 1dwg== X-Gm-Message-State: AOAM532DhyueW8UbbMDuj3ZuTZv5V6jOQbB9PT/y7SBexJZdhTbIVsqP Mb7yk+JznFbKxLnjzntmpCDGqw== X-Google-Smtp-Source: ABdhPJzYLlFDG3DPAanmIle2JDPt/kPaSDsPFChs9W3RIaEF73NmgEM3ur/dwwvO1eSz3Q1EqB8qLg== X-Received: by 2002:a17:90b:d86:: with SMTP id bg6mr1721096pjb.155.1600909821207; Wed, 23 Sep 2020 18:10:21 -0700 (PDT) Received: from localhost ([2620:15c:202:1:f693:9fff:fef4:e70a]) by smtp.gmail.com with ESMTPSA id j4sm791039pfd.101.2020.09.23.18.10.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Sep 2020 18:10:20 -0700 (PDT) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Rob Herring , Frank Rowand Cc: linux-usb@vger.kernel.org, Douglas Anderson , Bastien Nocera , Ravi Chandra Sadineni , Peter Chen , Krzysztof Kozlowski , Alan Stern , devicetree@vger.kernel.org, Stephen Boyd , linux-kernel@vger.kernel.org, Matthias Kaehlcke , "Alexander A. Klimov" , Masahiro Yamada Subject: [PATCH v3 2/2] USB: misc: Add onboard_usb_hub driver Date: Wed, 23 Sep 2020 18:10:12 -0700 Message-Id: <20200923180952.v3.2.I7c9a1f1d6ced41dd8310e8a03da666a32364e790@changeid> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog In-Reply-To: <20200923180952.v3.1.I248292623d3d0f6a4f0c5bc58478ca3c0062b49a@changeid> References: <20200923180952.v3.1.I248292623d3d0f6a4f0c5bc58478ca3c0062b49a@changeid> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The main issue this driver addresses is that a USB hub needs to be powered before it can be discovered. For discrete onboard hubs (an example for such a hub is the Realtek RTS5411) this is often solved by supplying the hub with an 'always-on' regulator, which is kind of a hack. Some onboard hubs may require further initialization steps, like changing the state of a GPIO or enabling a clock, which requires even more hacks. This driver creates a platform device representing the hub which performs the necessary initialization. Currently it only supports switching on a single regulator, support for multiple regulators or other actions can be added as needed. Different initialization sequences can be supported based on the compatible string. Besides performing the initialization the driver can be configured to power the hub off during system suspend. This can help to extend battery life on battery powered devices which have no requirements to keep the hub powered during suspend. The driver can also be configured to leave the hub powered when a wakeup capable USB device is connected when suspending, and power it off otherwise. Technically the driver consists of two drivers, the platform driver described above and a very thin USB driver that subclasses the generic driver. The purpose of this driver is to provide the platform driver with the USB devices corresponding to the hub(s) (a hub controller may provide multiple 'logical' hubs, e.g. one to support USB 2.0 and another for USB 3.x). Co-developed-by: Ravi Chandra Sadineni Signed-off-by: Ravi Chandra Sadineni Signed-off-by: Matthias Kaehlcke --- Changes in v3: - updated the commit message - updated description in Kconfig - remove include of 'core/usb.h' - use 'is_powered_on' flag instead of 'has_wakeup_capable_descendants' - added 'going_away' flag to struct onboard_hub - don't allow adding new USB devices when the platform device is going away - don't bother with deleting the list item in onboard_hub_remove_usbdev() when the platform device is going away - don't assume in onboard_hub_suspend() that all USB hub devices are connected to the same controller - removed unnecessary devm_kfree() from onboard_hub_remove_usbdev() - fixed error handling in onboard_hub_remove_usbdev() - use kstrtobool() instead of strtobool() in power_off_in_suspend_store() - unbind USB devices in onboard_hub_remove() to avoid dangling references to the platform device - moved put_device() for platform device to _find_onboard_hub() - changed return value of onboard_hub_remove_usbdev() to void - evaluate return value of onboard_hub_add_usbdev() - register 'power_off_in_suspend' as managed device attribute - use USB_DEVICE macro instead manual initialization - add unwinding to onboard_hub_init() - updated MODULE_DESCRIPTION - use module_init() instead of device_initcall() Changes in v2: - check wakeup enabled state of the USB controller instead of using 'wakeup-source' property - use sysfs attribute instead of DT property to determine if the hub should be powered off at all during system suspend - added missing brace in onboard_hub_suspend() - updated commit message - use pm_ptr for pm_ops as suggested by Alan Changes in v1: - renamed the driver to 'onboard_usb_hub' - single file for platform and USB driver - USB hub devices register with the platform device - the DT includes a phandle of the platform device - the platform device now controls when power is turned off - the USB driver became a very thin subclass of the generic USB driver - enabled autosuspend support drivers/usb/misc/Kconfig | 16 ++ drivers/usb/misc/Makefile | 1 + drivers/usb/misc/onboard_usb_hub.c | 370 +++++++++++++++++++++++++++++ 3 files changed, 387 insertions(+) create mode 100644 drivers/usb/misc/onboard_usb_hub.c diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index 6818ea689cd9..df470903848c 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -275,3 +275,19 @@ config USB_CHAOSKEY To compile this driver as a module, choose M here: the module will be called chaoskey. + +config USB_ONBOARD_HUB + tristate "Onboard USB hub support" + depends on OF || COMPILE_TEST + help + Say Y here if you want to support discrete onboard USB hubs that + don't require an additional control bus for initialization (an + example for such a hub is the Realtek RTS5411). The driver powers + supported hubs on and may perform other initialization steps. + + The driver can be configured to turn off the power of the hub + during system suspend. This may reduce power consumption while + the system is suspended. + + To compile this driver as a module, choose M here: the + module will be called onboard_usb_hub. diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile index da39bddb0604..6f10a1c6f7e9 100644 --- a/drivers/usb/misc/Makefile +++ b/drivers/usb/misc/Makefile @@ -31,3 +31,4 @@ obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/ obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o +obj-$(CONFIG_USB_ONBOARD_HUB) += onboard_usb_hub.o diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c new file mode 100644 index 000000000000..390ae9fe13d0 --- /dev/null +++ b/drivers/usb/misc/onboard_usb_hub.c @@ -0,0 +1,370 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for onboard USB hubs + * + * Copyright (c) 2020, Google LLC + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/************************** Platform driver **************************/ + +struct udev_node { + struct usb_device *udev; + struct list_head list; +}; + +struct onboard_hub { + struct regulator *vdd; + struct device *dev; + bool power_off_in_suspend; + bool is_powered_on; + bool going_away; + struct list_head udev_list; + struct mutex lock; +}; + +static int onboard_hub_power_on(struct onboard_hub *hub) +{ + int err; + + err = regulator_enable(hub->vdd); + if (err) { + dev_err(hub->dev, "failed to enable regulator: %d\n", err); + return err; + } + + hub->is_powered_on = true; + + return 0; +} + +static int onboard_hub_power_off(struct onboard_hub *hub) +{ + int err; + + err = regulator_disable(hub->vdd); + if (err) { + dev_err(hub->dev, "failed to enable regulator: %d\n", err); + return err; + } + + hub->is_powered_on = false; + + return 0; +} + +static int __maybe_unused onboard_hub_suspend(struct device *dev) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + struct udev_node *node; + bool power_off; + int rc = 0; + + if (!hub->power_off_in_suspend) + return 0; + + power_off = true; + + mutex_lock(&hub->lock); + + list_for_each_entry(node, &hub->udev_list, list) { + if (!device_may_wakeup(node->udev->bus->controller)) + continue; + + if (usb_wakeup_enabled_descendants(node->udev)) { + power_off = false; + break; + } + } + + mutex_unlock(&hub->lock); + + if (power_off) + rc = onboard_hub_power_off(hub); + + return rc; +} + +static int __maybe_unused onboard_hub_resume(struct device *dev) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + int rc = 0; + + if (!hub->is_powered_on) + rc = onboard_hub_power_on(hub); + + return rc; +} + +static int onboard_hub_add_usbdev(struct onboard_hub *hub, struct usb_device *udev) +{ + struct udev_node *node; + int ret = 0; + + mutex_lock(&hub->lock); + + if (hub->going_away) { + ret = -EINVAL; + goto unlock; + } + + node = devm_kzalloc(hub->dev, sizeof(*node), GFP_KERNEL); + if (!node) { + ret = -ENOMEM; + goto unlock; + } + + node->udev = udev; + + list_add(&node->list, &hub->udev_list); + +unlock: + mutex_unlock(&hub->lock); + + return ret; +} + +static void onboard_hub_remove_usbdev(struct onboard_hub *hub, struct usb_device *udev) +{ + struct udev_node *node; + + smp_rmb(); + if (hub->going_away) { + /* + * We are most likely being called as a result of unbinding a USB device from + * onboard_hub_remove(). This function also holds the lock and iterates over + * 'udev_list'. Skip deleting the node in this case to avoid a self deadlock, + * keeping the node in the list isn't a problem, since the device is about to go + * away. + */ + return; + } + + mutex_lock(&hub->lock); + + list_for_each_entry(node, &hub->udev_list, list) { + if (node->udev == udev) { + list_del(&node->list); + break; + } + } + + mutex_unlock(&hub->lock); +} + +static ssize_t power_off_in_suspend_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", hub->power_off_in_suspend); +} + +static ssize_t power_off_in_suspend_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct onboard_hub *hub = dev_get_drvdata(dev); + bool val; + int ret; + + ret = kstrtobool(buf, &val); + if (ret < 0) + return ret; + + hub->power_off_in_suspend = val; + + return count; +} +static DEVICE_ATTR_RW(power_off_in_suspend); + +static struct attribute *onboard_hub_sysfs_entries[] = { + &dev_attr_power_off_in_suspend.attr, + NULL, +}; + +static const struct attribute_group onboard_hub_sysfs_group = { + .attrs = onboard_hub_sysfs_entries, +}; + +static int onboard_hub_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct onboard_hub *hub; + int err; + + hub = devm_kzalloc(dev, sizeof(*hub), GFP_KERNEL); + if (!hub) + return -ENOMEM; + + hub->vdd = devm_regulator_get(dev, "vdd"); + if (IS_ERR(hub->vdd)) + return PTR_ERR(hub->vdd); + + hub->dev = dev; + mutex_init(&hub->lock); + INIT_LIST_HEAD(&hub->udev_list); + + dev_set_drvdata(dev, hub); + + err = devm_device_add_group(dev, &onboard_hub_sysfs_group); + if (err) { + dev_err(dev, "failed to create sysfs entries: %d\n", err); + return err; + } + + return onboard_hub_power_on(hub); +} + +static int onboard_hub_remove(struct platform_device *pdev) +{ + struct onboard_hub *hub = dev_get_drvdata(&pdev->dev); + struct udev_node *node; + + hub->going_away = true; + + mutex_lock(&hub->lock); + + /* unbind the USB devices to avoid dangling references to this device */ + list_for_each_entry(node, &hub->udev_list, list) + device_release_driver(&node->udev->dev); + + mutex_unlock(&hub->lock); + + return onboard_hub_power_off(hub); +} + +static const struct of_device_id onboard_hub_match[] = { + { .compatible = "onboard-usb-hub" }, + { .compatible = "realtek,rts5411" }, + {} +}; +MODULE_DEVICE_TABLE(of, onboard_hub_match); + +static SIMPLE_DEV_PM_OPS(onboard_hub_pm_ops, onboard_hub_suspend, onboard_hub_resume); + +static struct platform_driver onboard_hub_driver = { + .probe = onboard_hub_probe, + .remove = onboard_hub_remove, + + .driver = { + .name = "onboard-usb-hub", + .of_match_table = onboard_hub_match, + .pm = pm_ptr(&onboard_hub_pm_ops), + }, +}; + +/************************** USB driver **************************/ + +#define VENDOR_ID_REALTEK 0x0bda + +static struct onboard_hub *_find_onboard_hub(struct device *dev) +{ + const phandle *ph; + struct device_node *np; + struct platform_device *pdev; + + ph = of_get_property(dev->of_node, "hub", NULL); + if (!ph) { + dev_err(dev, "failed to read 'hub' property\n"); + return ERR_PTR(-EINVAL); + } + + np = of_find_node_by_phandle(be32_to_cpu(*ph)); + if (!np) { + dev_err(dev, "failed find device node for onboard hub\n"); + return ERR_PTR(-EINVAL); + } + + pdev = of_find_device_by_node(np); + of_node_put(np); + if (!pdev) + return ERR_PTR(-EPROBE_DEFER); + + put_device(&pdev->dev); + + return dev_get_drvdata(&pdev->dev); +} + +static int onboard_hub_usbdev_probe(struct usb_device *udev) +{ + struct device *dev = &udev->dev; + struct onboard_hub *hub; + + /* ignore supported hubs without device tree node */ + if (!dev->of_node) + return -ENODEV; + + hub = _find_onboard_hub(dev); + if (IS_ERR(hub)) + return PTR_ERR(dev); + + dev_set_drvdata(dev, hub); + + return onboard_hub_add_usbdev(hub, udev); +} + +static void onboard_hub_usbdev_disconnect(struct usb_device *udev) +{ + struct onboard_hub *hub = dev_get_drvdata(&udev->dev); + + onboard_hub_remove_usbdev(hub, udev); +} + +static const struct usb_device_id onboard_hub_id_table[] = { + { USB_DEVICE(VENDOR_ID_REALTEK, 0x0411) }, /* RTS5411 USB 3.0 */ + { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.0 */ + {}, +}; + +MODULE_DEVICE_TABLE(usb, onboard_hub_id_table); + +static struct usb_device_driver onboard_hub_usbdev_driver = { + + .name = "onboard-usb-hub", + .probe = onboard_hub_usbdev_probe, + .disconnect = onboard_hub_usbdev_disconnect, + .generic_subclass = 1, + .supports_autosuspend = 1, + .id_table = onboard_hub_id_table, +}; + +/************************** Driver (de)registration **************************/ + +static int __init onboard_hub_init(void) +{ + int ret; + + ret = platform_driver_register(&onboard_hub_driver); + if (ret) + return ret; + + ret = usb_register_device_driver(&onboard_hub_usbdev_driver, THIS_MODULE); + if (ret) + platform_driver_unregister(&onboard_hub_driver); + + return ret; +} +module_init(onboard_hub_init); + +static void __exit onboard_hub_exit(void) +{ + usb_deregister_device_driver(&onboard_hub_usbdev_driver); + platform_driver_unregister(&onboard_hub_driver); +} +module_exit(onboard_hub_exit); + +MODULE_AUTHOR("Matthias Kaehlcke "); +MODULE_DESCRIPTION("Driver for discrete onboard USB hubs"); +MODULE_LICENSE("GPL v2");