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348 lines
8.5 KiB
348 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* USB GPIO Based Connection Detection Driver |
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* |
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* Copyright (C) 2019 MediaTek Inc. |
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* |
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* Author: Chunfeng Yun <[email protected]> |
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* |
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* Some code borrowed from drivers/extcon/extcon-usb-gpio.c |
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*/ |
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#include <linux/device.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/pinctrl/consumer.h> |
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#include <linux/platform_device.h> |
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#include <linux/power_supply.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/usb/role.h> |
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#define USB_GPIO_DEB_MS 20 /* ms */ |
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#define USB_GPIO_DEB_US ((USB_GPIO_DEB_MS) * 1000) /* us */ |
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#define USB_CONN_IRQF \ |
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(IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT) |
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struct usb_conn_info { |
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struct device *dev; |
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struct usb_role_switch *role_sw; |
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enum usb_role last_role; |
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struct regulator *vbus; |
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struct delayed_work dw_det; |
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unsigned long debounce_jiffies; |
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struct gpio_desc *id_gpiod; |
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struct gpio_desc *vbus_gpiod; |
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int id_irq; |
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int vbus_irq; |
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struct power_supply_desc desc; |
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struct power_supply *charger; |
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}; |
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/* |
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* "DEVICE" = VBUS and "HOST" = !ID, so we have: |
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* Both "DEVICE" and "HOST" can't be set as active at the same time |
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* so if "HOST" is active (i.e. ID is 0) we keep "DEVICE" inactive |
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* even if VBUS is on. |
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* |
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* Role | ID | VBUS |
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* ------------------------------------ |
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* [1] DEVICE | H | H |
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* [2] NONE | H | L |
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* [3] HOST | L | H |
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* [4] HOST | L | L |
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* |
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* In case we have only one of these signals: |
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* - VBUS only - we want to distinguish between [1] and [2], so ID is always 1 |
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* - ID only - we want to distinguish between [1] and [4], so VBUS = ID |
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*/ |
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static void usb_conn_detect_cable(struct work_struct *work) |
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{ |
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struct usb_conn_info *info; |
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enum usb_role role; |
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int id, vbus, ret; |
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info = container_of(to_delayed_work(work), |
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struct usb_conn_info, dw_det); |
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/* check ID and VBUS */ |
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id = info->id_gpiod ? |
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gpiod_get_value_cansleep(info->id_gpiod) : 1; |
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vbus = info->vbus_gpiod ? |
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gpiod_get_value_cansleep(info->vbus_gpiod) : id; |
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if (!id) |
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role = USB_ROLE_HOST; |
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else if (vbus) |
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role = USB_ROLE_DEVICE; |
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else |
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role = USB_ROLE_NONE; |
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dev_dbg(info->dev, "role %d/%d, gpios: id %d, vbus %d\n", |
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info->last_role, role, id, vbus); |
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if (info->last_role == role) { |
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dev_warn(info->dev, "repeated role: %d\n", role); |
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return; |
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} |
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if (info->last_role == USB_ROLE_HOST && info->vbus) |
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regulator_disable(info->vbus); |
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ret = usb_role_switch_set_role(info->role_sw, role); |
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if (ret) |
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dev_err(info->dev, "failed to set role: %d\n", ret); |
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if (role == USB_ROLE_HOST && info->vbus) { |
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ret = regulator_enable(info->vbus); |
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if (ret) |
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dev_err(info->dev, "enable vbus regulator failed\n"); |
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} |
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info->last_role = role; |
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if (info->vbus) |
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dev_dbg(info->dev, "vbus regulator is %s\n", |
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regulator_is_enabled(info->vbus) ? "enabled" : "disabled"); |
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power_supply_changed(info->charger); |
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} |
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static void usb_conn_queue_dwork(struct usb_conn_info *info, |
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unsigned long delay) |
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{ |
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queue_delayed_work(system_power_efficient_wq, &info->dw_det, delay); |
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} |
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static irqreturn_t usb_conn_isr(int irq, void *dev_id) |
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{ |
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struct usb_conn_info *info = dev_id; |
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usb_conn_queue_dwork(info, info->debounce_jiffies); |
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return IRQ_HANDLED; |
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} |
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static enum power_supply_property usb_charger_properties[] = { |
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POWER_SUPPLY_PROP_ONLINE, |
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}; |
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static int usb_charger_get_property(struct power_supply *psy, |
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enum power_supply_property psp, |
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union power_supply_propval *val) |
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{ |
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struct usb_conn_info *info = power_supply_get_drvdata(psy); |
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switch (psp) { |
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case POWER_SUPPLY_PROP_ONLINE: |
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val->intval = info->last_role == USB_ROLE_DEVICE; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int usb_conn_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct power_supply_desc *desc; |
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struct usb_conn_info *info; |
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struct power_supply_config cfg = { |
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.of_node = dev->of_node, |
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}; |
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bool need_vbus = true; |
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int ret = 0; |
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info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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info->dev = dev; |
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info->id_gpiod = devm_gpiod_get_optional(dev, "id", GPIOD_IN); |
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if (IS_ERR(info->id_gpiod)) |
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return PTR_ERR(info->id_gpiod); |
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info->vbus_gpiod = devm_gpiod_get_optional(dev, "vbus", GPIOD_IN); |
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if (IS_ERR(info->vbus_gpiod)) |
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return PTR_ERR(info->vbus_gpiod); |
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if (!info->id_gpiod && !info->vbus_gpiod) { |
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dev_err(dev, "failed to get gpios\n"); |
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return -ENODEV; |
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} |
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if (info->id_gpiod) |
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ret = gpiod_set_debounce(info->id_gpiod, USB_GPIO_DEB_US); |
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if (!ret && info->vbus_gpiod) |
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ret = gpiod_set_debounce(info->vbus_gpiod, USB_GPIO_DEB_US); |
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if (ret < 0) |
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info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEB_MS); |
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INIT_DELAYED_WORK(&info->dw_det, usb_conn_detect_cable); |
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/* |
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* If the USB connector is a child of a USB port and that port already provides the VBUS |
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* supply, there's no need for the USB connector to provide it again. |
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*/ |
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if (dev->parent && dev->parent->of_node) { |
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if (of_find_property(dev->parent->of_node, "vbus-supply", NULL)) |
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need_vbus = false; |
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} |
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if (!need_vbus) { |
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info->vbus = devm_regulator_get_optional(dev, "vbus"); |
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if (PTR_ERR(info->vbus) == -ENODEV) |
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info->vbus = NULL; |
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} else { |
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info->vbus = devm_regulator_get(dev, "vbus"); |
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} |
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if (IS_ERR(info->vbus)) { |
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if (PTR_ERR(info->vbus) != -EPROBE_DEFER) |
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dev_err(dev, "failed to get vbus: %ld\n", PTR_ERR(info->vbus)); |
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return PTR_ERR(info->vbus); |
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} |
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info->role_sw = usb_role_switch_get(dev); |
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if (IS_ERR(info->role_sw)) { |
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if (PTR_ERR(info->role_sw) != -EPROBE_DEFER) |
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dev_err(dev, "failed to get role switch\n"); |
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return PTR_ERR(info->role_sw); |
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} |
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if (info->id_gpiod) { |
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info->id_irq = gpiod_to_irq(info->id_gpiod); |
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if (info->id_irq < 0) { |
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dev_err(dev, "failed to get ID IRQ\n"); |
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ret = info->id_irq; |
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goto put_role_sw; |
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} |
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ret = devm_request_threaded_irq(dev, info->id_irq, NULL, |
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usb_conn_isr, USB_CONN_IRQF, |
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pdev->name, info); |
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if (ret < 0) { |
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dev_err(dev, "failed to request ID IRQ\n"); |
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goto put_role_sw; |
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} |
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} |
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if (info->vbus_gpiod) { |
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info->vbus_irq = gpiod_to_irq(info->vbus_gpiod); |
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if (info->vbus_irq < 0) { |
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dev_err(dev, "failed to get VBUS IRQ\n"); |
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ret = info->vbus_irq; |
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goto put_role_sw; |
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} |
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ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL, |
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usb_conn_isr, USB_CONN_IRQF, |
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pdev->name, info); |
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if (ret < 0) { |
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dev_err(dev, "failed to request VBUS IRQ\n"); |
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goto put_role_sw; |
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} |
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} |
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desc = &info->desc; |
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desc->name = "usb-charger"; |
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desc->properties = usb_charger_properties; |
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desc->num_properties = ARRAY_SIZE(usb_charger_properties); |
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desc->get_property = usb_charger_get_property; |
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desc->type = POWER_SUPPLY_TYPE_USB; |
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cfg.drv_data = info; |
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info->charger = devm_power_supply_register(dev, desc, &cfg); |
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if (IS_ERR(info->charger)) { |
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dev_err(dev, "Unable to register charger\n"); |
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return PTR_ERR(info->charger); |
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} |
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platform_set_drvdata(pdev, info); |
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/* Perform initial detection */ |
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usb_conn_queue_dwork(info, 0); |
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return 0; |
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put_role_sw: |
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usb_role_switch_put(info->role_sw); |
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return ret; |
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} |
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static int usb_conn_remove(struct platform_device *pdev) |
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{ |
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struct usb_conn_info *info = platform_get_drvdata(pdev); |
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cancel_delayed_work_sync(&info->dw_det); |
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if (info->last_role == USB_ROLE_HOST && info->vbus) |
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regulator_disable(info->vbus); |
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usb_role_switch_put(info->role_sw); |
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return 0; |
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} |
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static int __maybe_unused usb_conn_suspend(struct device *dev) |
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{ |
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struct usb_conn_info *info = dev_get_drvdata(dev); |
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if (info->id_gpiod) |
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disable_irq(info->id_irq); |
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if (info->vbus_gpiod) |
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disable_irq(info->vbus_irq); |
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pinctrl_pm_select_sleep_state(dev); |
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return 0; |
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} |
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static int __maybe_unused usb_conn_resume(struct device *dev) |
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{ |
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struct usb_conn_info *info = dev_get_drvdata(dev); |
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pinctrl_pm_select_default_state(dev); |
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if (info->id_gpiod) |
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enable_irq(info->id_irq); |
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if (info->vbus_gpiod) |
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enable_irq(info->vbus_irq); |
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usb_conn_queue_dwork(info, 0); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(usb_conn_pm_ops, |
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usb_conn_suspend, usb_conn_resume); |
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static const struct of_device_id usb_conn_dt_match[] = { |
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{ .compatible = "gpio-usb-b-connector", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, usb_conn_dt_match); |
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static struct platform_driver usb_conn_driver = { |
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.probe = usb_conn_probe, |
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.remove = usb_conn_remove, |
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.driver = { |
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.name = "usb-conn-gpio", |
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.pm = &usb_conn_pm_ops, |
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.of_match_table = usb_conn_dt_match, |
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}, |
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}; |
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module_platform_driver(usb_conn_driver); |
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MODULE_AUTHOR("Chunfeng Yun <[email protected]>"); |
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MODULE_DESCRIPTION("USB GPIO based connection detection driver"); |
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MODULE_LICENSE("GPL v2");
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