From patchwork Fri Mar 15 07:38:32 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: 10854165 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 AEF501575 for ; Fri, 15 Mar 2019 07:40:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 96A7B2A890 for ; Fri, 15 Mar 2019 07:40:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8AD152A892; Fri, 15 Mar 2019 07:40:45 +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=ham 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 B30C02A890 for ; Fri, 15 Mar 2019 07:40:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728577AbfCOHkj (ORCPT ); Fri, 15 Mar 2019 03:40:39 -0400 Received: from mailgw02.mediatek.com ([1.203.163.81]:23140 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1728547AbfCOHkf (ORCPT ); Fri, 15 Mar 2019 03:40:35 -0400 X-UUID: 3596eb8be7884ae99aed1ef2a487aa87-20190315 X-UUID: 3596eb8be7884ae99aed1ef2a487aa87-20190315 Received: from mtkcas32.mediatek.inc [(172.27.4.253)] by mailgw02.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLS) with ESMTP id 1718115147; Fri, 15 Mar 2019 15:40:27 +0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 15 Mar 2019 15:40:26 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 15 Mar 2019 15:40:24 +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 , , , , , Subject: [PATCH v2 5/6] usb: roles: add driver of USB Type-B role switch by GPIO Date: Fri, 15 Mar 2019 15:38:32 +0800 Message-ID: <1552635513-2378-6-git-send-email-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1552635513-2378-1-git-send-email-chunfeng.yun@mediatek.com> References: <1552635513-2378-1-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 introduce a Type-B connector driver and try to replace the function provided by extcon-usb-gpio driver Signed-off-by: Chunfeng Yun --- v2 changes: 1. file name is changed 2. use new compatible --- drivers/usb/roles/Kconfig | 14 ++ drivers/usb/roles/Makefile | 1 + drivers/usb/roles/typeb-switch-gpio.c | 285 ++++++++++++++++++++++++++ 3 files changed, 300 insertions(+) create mode 100644 drivers/usb/roles/typeb-switch-gpio.c diff --git a/drivers/usb/roles/Kconfig b/drivers/usb/roles/Kconfig index e4194ac94510..3c4320a73d17 100644 --- a/drivers/usb/roles/Kconfig +++ b/drivers/usb/roles/Kconfig @@ -24,4 +24,18 @@ 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_SWITCH_GPIO + tristate "USB Type-B Role Switch Via GPIO" + depends on GPIOLIB + help + The driver supports USB role switch between host and device via GPIO + based USB cable detection, used typically if GPIO is used for USB ID + pin detection. And it's used to replace the function provided by + drivers/extcon/extcon-usb-gpio.c driver due to the requirement by + connector/usb-connector.txt + + Say Y here if your USB Type-B Connector supports Dual-Role mode. + To compile the driver as a module, choose M here: the module will + be called usb-b-connector.ko + endif # USB_ROLE_SWITCH diff --git a/drivers/usb/roles/Makefile b/drivers/usb/roles/Makefile index c02873206fc1..00f697bd419f 100644 --- a/drivers/usb/roles/Makefile +++ b/drivers/usb/roles/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_USB_ROLE_SWITCH) += roles.o roles-y := class.o +obj-$(CONFIG_TYPEB_SWITCH_GPIO) += typeb-switch-gpio.o obj-$(CONFIG_USB_ROLES_INTEL_XHCI) += intel-xhci-usb-role-switch.o diff --git a/drivers/usb/roles/typeb-switch-gpio.c b/drivers/usb/roles/typeb-switch-gpio.c new file mode 100644 index 000000000000..d8a15269bf8f --- /dev/null +++ b/drivers/usb/roles/typeb-switch-gpio.c @@ -0,0 +1,285 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * USB Type-B 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 + +#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 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; + info->id_gpiod = devm_gpiod_get_optional(dev, "id", GPIOD_IN); + if (IS_ERR(info->id_gpiod)) + return PTR_ERR(info->id_gpiod); + + info->vbus_gpiod = devm_gpiod_get_optional(dev, "vbus", GPIOD_IN); + if (IS_ERR(info->vbus_gpiod)) + return PTR_ERR(info->vbus_gpiod); + + if (!info->id_gpiod && !info->vbus_gpiod) { + dev_err(dev, "failed to get gpios\n"); + return -ENODEV; + } + + 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); + } + + parent = of_get_parent(np); + info->role_sw = usb_role_switch_get_by_node(parent); + if (IS_ERR_OR_NULL(info->role_sw)) { + dev_err(dev, "failed to get role switch\n"); + return PTR_ERR(info->role_sw); + } + + of_node_put(parent); + + 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-switch-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 = "usb_b_conn", + .pm = DEV_PMS_OPS, + .of_match_table = usb_conn_dt_match, + }, +}; + +module_platform_driver(usb_conn_driver); + +MODULE_AUTHOR("Chunfeng Yun "); +MODULE_DESCRIPTION("USB GPIO conn driver"); +MODULE_LICENSE("GPL v2");