From patchwork Fri Apr 26 06:47:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?Q2h1bmZlbmcgWXVuICjkupHmmKXls7Ap?= X-Patchwork-Id: 10918383 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7DCC71395 for ; Fri, 26 Apr 2019 06:48:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6BB9228B18 for ; Fri, 26 Apr 2019 06:48:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 601C828B22; Fri, 26 Apr 2019 06:48:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9CE9228B18 for ; Fri, 26 Apr 2019 06:48:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726321AbfDZGr4 (ORCPT ); Fri, 26 Apr 2019 02:47:56 -0400 Received: from Mailgw01.mediatek.com ([1.203.163.78]:30606 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726065AbfDZGry (ORCPT ); Fri, 26 Apr 2019 02:47:54 -0400 X-UUID: a2617321b56145769ac57800272f8e1f-20190426 X-UUID: a2617321b56145769ac57800272f8e1f-20190426 Received: from mtkcas34.mediatek.inc [(172.27.4.253)] by mailgw01.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLS) with ESMTP id 611823525; Fri, 26 Apr 2019 14:47:42 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by MTKMBS31N2.mediatek.inc (172.27.4.87) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 26 Apr 2019 14:47:40 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 26 Apr 2019 14:47:39 +0800 From: Chunfeng Yun To: Rob Herring , Greg Kroah-Hartman , Heikki Krogerus CC: Mark Rutland , Chunfeng Yun , Matthias Brugger , Adam Thomson , Li Jun , Badhri Jagan Sridharan , Hans de Goede , Andy Shevchenko , Min Guo , , , , , , Biju Das , Linus Walleij Subject: [PATCH v4 5/6] usb: roles: add USB Type-B GPIO connector driver Date: Fri, 26 Apr 2019 14:47:16 +0800 Message-ID: <1556261237-13823-6-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1556261237-13823-1-git-send-email-chunfeng.yun@mediatek.com> References: <1556261237-13823-1-git-send-email-chunfeng.yun@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Due to the requirement of usb-connector.txt binding, the old way using extcon to support USB Dual-Role switch is now deprecated when use Type-B connector. This patch introduces a driver of Type-B connector which typically uses an input GPIO to detect USB ID pin, and try to replace the function provided by extcon-usb-gpio driver Signed-off-by: Chunfeng Yun --- v4 changes: 1. remove linux/gpio.h suggested by Linus 2. put node when error happens v3 changes: 1. treat bype-B connector as a virtual device; 2. change file name again v2 changes: 1. file name is changed 2. use new compatible --- drivers/usb/roles/Kconfig | 11 + drivers/usb/roles/Makefile | 1 + drivers/usb/roles/typeb-conn-gpio.c | 305 ++++++++++++++++++++++++++++ 3 files changed, 317 insertions(+) create mode 100644 drivers/usb/roles/typeb-conn-gpio.c diff --git a/drivers/usb/roles/Kconfig b/drivers/usb/roles/Kconfig index f8b31aa67526..d1156e18a81a 100644 --- a/drivers/usb/roles/Kconfig +++ b/drivers/usb/roles/Kconfig @@ -26,4 +26,15 @@ config USB_ROLES_INTEL_XHCI To compile the driver as a module, choose M here: the module will be called intel-xhci-usb-role-switch. +config TYPEB_CONN_GPIO + tristate "USB Type-B GPIO Connector" + depends on GPIOLIB + help + The driver supports USB role switch between host and device via GPIO + based USB cable detection, used typically if an input GPIO is used + to detect USB ID pin. + + To compile the driver as a module, choose M here: the module will + be called typeb-conn-gpio.ko + endif # USB_ROLE_SWITCH diff --git a/drivers/usb/roles/Makefile b/drivers/usb/roles/Makefile index 757a7d2797eb..5d5620d9d113 100644 --- a/drivers/usb/roles/Makefile +++ b/drivers/usb/roles/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_USB_ROLE_SWITCH) += roles.o roles-y := class.o obj-$(CONFIG_USB_ROLES_INTEL_XHCI) += intel-xhci-usb-role-switch.o +obj-$(CONFIG_TYPEB_CONN_GPIO) += typeb-conn-gpio.o diff --git a/drivers/usb/roles/typeb-conn-gpio.c b/drivers/usb/roles/typeb-conn-gpio.c new file mode 100644 index 000000000000..097d2ca12a12 --- /dev/null +++ b/drivers/usb/roles/typeb-conn-gpio.c @@ -0,0 +1,305 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * USB Type-B GPIO Connector Driver + * + * Copyright (C) 2019 MediaTek Inc. + * + * Author: Chunfeng Yun + * + * Some code borrowed from drivers/extcon/extcon-usb-gpio.c + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define USB_GPIO_DEB_MS 20 /* ms */ +#define USB_GPIO_DEB_US ((USB_GPIO_DEB_MS) * 1000) /* us */ + +#define USB_CONN_IRQF \ + (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT) + +struct usb_conn_info { + struct device *dev; + struct usb_role_switch *role_sw; + enum usb_role last_role; + struct regulator *vbus; + struct delayed_work dw_det; + unsigned long debounce_jiffies; + + struct gpio_desc *id_gpiod; + struct gpio_desc *vbus_gpiod; + int id_irq; + int vbus_irq; +}; + +/** + * "DEVICE" = VBUS and "HOST" = !ID, so we have: + * Both "DEVICE" and "HOST" can't be set as active at the same time + * so if "HOST" is active (i.e. ID is 0) we keep "DEVICE" inactive + * even if VBUS is on. + * + * Role | ID | VBUS + * ------------------------------------ + * [1] DEVICE | H | H + * [2] NONE | H | L + * [3] HOST | L | H + * [4] HOST | L | L + * + * In case we have only one of these signals: + * - VBUS only - we want to distinguish between [1] and [2], so ID is always 1 + * - ID only - we want to distinguish between [1] and [4], so VBUS = ID + */ +static void usb_conn_detect_cable(struct work_struct *work) +{ + struct usb_conn_info *info; + enum usb_role role; + int id, vbus, ret; + + info = container_of(to_delayed_work(work), + struct usb_conn_info, dw_det); + + /* check ID and VBUS */ + id = info->id_gpiod ? + gpiod_get_value_cansleep(info->id_gpiod) : 1; + vbus = info->vbus_gpiod ? + gpiod_get_value_cansleep(info->vbus_gpiod) : id; + + if (!id) + role = USB_ROLE_HOST; + else if (vbus) + role = USB_ROLE_DEVICE; + else + role = USB_ROLE_NONE; + + dev_dbg(info->dev, "role %d/%d, gpios: id %d, vbus %d\n", + info->last_role, role, id, vbus); + + if (info->last_role == role) { + dev_warn(info->dev, "repeated role: %d\n", role); + return; + } + + if (info->last_role == USB_ROLE_HOST) + regulator_disable(info->vbus); + + ret = usb_role_switch_set_role(info->role_sw, role); + if (ret) + dev_err(info->dev, "failed to set role: %d\n", ret); + + if (role == USB_ROLE_HOST) { + ret = regulator_enable(info->vbus); + if (ret) + dev_err(info->dev, "enable vbus regulator failed\n"); + } + + info->last_role = role; + + dev_dbg(info->dev, "vbus regulator is %s\n", + regulator_is_enabled(info->vbus) ? "enabled" : "disabled"); +} + +static void usb_conn_queue_dwork(struct usb_conn_info *info, + unsigned long delay) +{ + queue_delayed_work(system_power_efficient_wq, &info->dw_det, delay); +} + +static irqreturn_t usb_conn_isr(int irq, void *dev_id) +{ + struct usb_conn_info *info = dev_id; + + usb_conn_queue_dwork(info, info->debounce_jiffies); + + return IRQ_HANDLED; +} + +static int usb_conn_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct device_node *parent; + struct device_node *child; + struct usb_conn_info *info; + int ret = 0; + + if (!np) + return -EINVAL; + + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->dev = dev; + + child = of_get_child_by_name(np, "connector"); + if (!child) { + dev_err(dev, "failed to find connector node\n"); + return -ENODEV; + } + + info->id_gpiod = devm_gpiod_get_from_of_node( + dev, child, "id-gpios", 0, GPIOD_IN, "idpin"); + if (IS_ERR(info->id_gpiod)) { + of_node_put(child); + return PTR_ERR(info->id_gpiod); + } + + info->vbus_gpiod = devm_gpiod_get_from_of_node( + dev, child, "vbus-gpios", 0, GPIOD_IN, + "vbuspin"); + if (IS_ERR(info->vbus_gpiod)) { + of_node_put(child); + return PTR_ERR(info->vbus_gpiod); + } + + if (!info->id_gpiod && !info->vbus_gpiod) { + dev_err(dev, "failed to get gpios\n"); + return -ENODEV; + } + + of_node_put(child); + + if (info->id_gpiod) + ret = gpiod_set_debounce(info->id_gpiod, USB_GPIO_DEB_US); + if (!ret && info->vbus_gpiod) + ret = gpiod_set_debounce(info->vbus_gpiod, USB_GPIO_DEB_US); + if (ret < 0) + info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEB_MS); + + INIT_DELAYED_WORK(&info->dw_det, usb_conn_detect_cable); + + info->vbus = devm_regulator_get(dev, "vbus"); + if (IS_ERR(info->vbus)) { + dev_err(dev, "failed to get vbus\n"); + return PTR_ERR(info->vbus); + } + + child = of_graph_get_endpoint_by_regs(np, -1, 0); + parent = of_graph_get_remote_port_parent(child); + info->role_sw = fwnode_usb_role_switch_get(of_fwnode_handle(parent)); + of_node_put(child); + of_node_put(parent); + if (IS_ERR(info->role_sw)) { + dev_err(dev, "failed to get role switch\n"); + return PTR_ERR(info->role_sw); + } + + if (info->id_gpiod) { + info->id_irq = gpiod_to_irq(info->id_gpiod); + if (info->id_irq < 0) { + dev_err(dev, "failed to get ID IRQ\n"); + return info->id_irq; + } + + ret = devm_request_threaded_irq(dev, info->id_irq, NULL, + usb_conn_isr, USB_CONN_IRQF, + pdev->name, info); + if (ret < 0) { + dev_err(dev, "failed to request ID IRQ\n"); + return ret; + } + } + + if (info->vbus_gpiod) { + info->vbus_irq = gpiod_to_irq(info->vbus_gpiod); + if (info->vbus_irq < 0) { + dev_err(dev, "failed to get VBUS IRQ\n"); + return info->vbus_irq; + } + + ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL, + usb_conn_isr, USB_CONN_IRQF, + pdev->name, info); + if (ret < 0) { + dev_err(dev, "failed to request VBUS IRQ\n"); + return ret; + } + } + + platform_set_drvdata(pdev, info); + + /* Perform initial detection */ + usb_conn_queue_dwork(info, 0); + + return 0; +} + +static int usb_conn_remove(struct platform_device *pdev) +{ + struct usb_conn_info *info = platform_get_drvdata(pdev); + + cancel_delayed_work_sync(&info->dw_det); + + if (info->last_role == USB_ROLE_HOST) + regulator_disable(info->vbus); + + usb_role_switch_put(info->role_sw); + + return 0; +} + +static int __maybe_unused usb_conn_suspend(struct device *dev) +{ + struct usb_conn_info *info = dev_get_drvdata(dev); + + if (info->id_gpiod) + disable_irq(info->id_irq); + if (info->vbus_gpiod) + disable_irq(info->vbus_irq); + + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +static int __maybe_unused usb_conn_resume(struct device *dev) +{ + struct usb_conn_info *info = dev_get_drvdata(dev); + + pinctrl_pm_select_default_state(dev); + + if (info->id_gpiod) + enable_irq(info->id_irq); + if (info->vbus_gpiod) + enable_irq(info->vbus_irq); + + usb_conn_queue_dwork(info, 0); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(usb_conn_pm_ops, + usb_conn_suspend, usb_conn_resume); + +#define DEV_PMS_OPS (IS_ENABLED(CONFIG_PM_SLEEP) ? &usb_conn_pm_ops : NULL) + +static const struct of_device_id usb_conn_dt_match[] = { + { .compatible = "linux,typeb-conn-gpio", }, + { } +}; +MODULE_DEVICE_TABLE(of, usb_conn_dt_match); + +static struct platform_driver usb_conn_driver = { + .probe = usb_conn_probe, + .remove = usb_conn_remove, + .driver = { + .name = "typeb-conn-gpio", + .pm = DEV_PMS_OPS, + .of_match_table = usb_conn_dt_match, + }, +}; + +module_platform_driver(usb_conn_driver); + +MODULE_AUTHOR("Chunfeng Yun "); +MODULE_DESCRIPTION("USB Type-B GPIO connector driver"); +MODULE_LICENSE("GPL v2");