278 lines
7.3 KiB
C
278 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Support for usb functionality of Hikey series boards
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* based on Hisilicon Kirin Soc.
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*
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* Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
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* http://www.huawei.com
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*
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* Authors: Yu Chen <chenyu56@huawei.com>
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/kernel.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/usb/role.h>
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#define DEVICE_DRIVER_NAME "hisi_hikey_usb"
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#define HUB_VBUS_POWER_ON 1
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#define HUB_VBUS_POWER_OFF 0
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#define USB_SWITCH_TO_HUB 1
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#define USB_SWITCH_TO_TYPEC 0
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#define TYPEC_VBUS_POWER_ON 1
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#define TYPEC_VBUS_POWER_OFF 0
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struct hisi_hikey_usb {
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struct device *dev;
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struct gpio_desc *otg_switch;
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struct gpio_desc *typec_vbus;
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struct gpio_desc *reset;
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struct regulator *regulator;
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struct usb_role_switch *hub_role_sw;
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struct usb_role_switch *dev_role_sw;
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enum usb_role role;
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struct mutex lock;
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struct work_struct work;
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struct notifier_block nb;
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};
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static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
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{
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int ret, status;
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if (!hisi_hikey_usb->regulator)
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return;
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status = regulator_is_enabled(hisi_hikey_usb->regulator);
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if (status == !!value)
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return;
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if (value)
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ret = regulator_enable(hisi_hikey_usb->regulator);
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else
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ret = regulator_disable(hisi_hikey_usb->regulator);
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if (ret)
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dev_err(hisi_hikey_usb->dev,
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"Can't switch regulator state to %s\n",
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value ? "enabled" : "disabled");
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}
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static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
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int switch_to)
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{
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if (!hisi_hikey_usb->otg_switch)
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return;
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gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
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}
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static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
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int value)
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{
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if (!hisi_hikey_usb->typec_vbus)
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return;
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gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
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}
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static void relay_set_role_switch(struct work_struct *work)
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{
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struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
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struct hisi_hikey_usb,
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work);
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struct usb_role_switch *sw;
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enum usb_role role;
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if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
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return;
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mutex_lock(&hisi_hikey_usb->lock);
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switch (hisi_hikey_usb->role) {
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case USB_ROLE_NONE:
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usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
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usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
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hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
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break;
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case USB_ROLE_HOST:
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hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
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usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
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usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
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break;
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case USB_ROLE_DEVICE:
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hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
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usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
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usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
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break;
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default:
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break;
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}
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sw = hisi_hikey_usb->dev_role_sw;
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role = hisi_hikey_usb->role;
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mutex_unlock(&hisi_hikey_usb->lock);
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usb_role_switch_set_role(sw, role);
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}
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static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
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{
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struct hisi_hikey_usb *hisi_hikey_usb = usb_role_switch_get_drvdata(sw);
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if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
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return -EINVAL;
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mutex_lock(&hisi_hikey_usb->lock);
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hisi_hikey_usb->role = role;
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mutex_unlock(&hisi_hikey_usb->lock);
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schedule_work(&hisi_hikey_usb->work);
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return 0;
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}
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static int hisi_hikey_usb_of_role_switch(struct platform_device *pdev,
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struct hisi_hikey_usb *hisi_hikey_usb)
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{
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struct device *dev = &pdev->dev;
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struct usb_role_switch_desc hub_role_switch = {NULL};
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if (!device_property_read_bool(dev, "usb-role-switch"))
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return 0;
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hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
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GPIOD_OUT_HIGH);
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if (IS_ERR(hisi_hikey_usb->otg_switch)) {
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dev_err(dev, "get otg-switch failed with error %ld\n",
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PTR_ERR(hisi_hikey_usb->otg_switch));
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return PTR_ERR(hisi_hikey_usb->otg_switch);
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}
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hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
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GPIOD_OUT_LOW);
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if (IS_ERR(hisi_hikey_usb->typec_vbus)) {
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dev_err(dev, "get typec-vbus failed with error %ld\n",
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PTR_ERR(hisi_hikey_usb->typec_vbus));
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return PTR_ERR(hisi_hikey_usb->typec_vbus);
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}
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hisi_hikey_usb->reset = devm_gpiod_get_optional(dev,
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"hub-reset-en",
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GPIOD_OUT_HIGH);
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if (IS_ERR(hisi_hikey_usb->reset)) {
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dev_err(dev, "get hub-reset-en failed with error %ld\n",
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PTR_ERR(hisi_hikey_usb->reset));
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return PTR_ERR(hisi_hikey_usb->reset);
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}
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hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
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if (!hisi_hikey_usb->dev_role_sw)
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return -EPROBE_DEFER;
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if (IS_ERR(hisi_hikey_usb->dev_role_sw)) {
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dev_err(dev, "get device role switch failed with error %ld\n",
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PTR_ERR(hisi_hikey_usb->dev_role_sw));
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return PTR_ERR(hisi_hikey_usb->dev_role_sw);
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}
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INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
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hub_role_switch.fwnode = dev_fwnode(dev);
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hub_role_switch.set = hub_usb_role_switch_set;
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hub_role_switch.driver_data = hisi_hikey_usb;
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hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
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&hub_role_switch);
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if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
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dev_err(dev,
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"failed to register hub role with error %ld\n",
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PTR_ERR(hisi_hikey_usb->hub_role_sw));
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usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
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return PTR_ERR(hisi_hikey_usb->hub_role_sw);
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}
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return 0;
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}
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static int hisi_hikey_usb_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct hisi_hikey_usb *hisi_hikey_usb;
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int ret;
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hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
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if (!hisi_hikey_usb)
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return -ENOMEM;
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hisi_hikey_usb->dev = &pdev->dev;
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mutex_init(&hisi_hikey_usb->lock);
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hisi_hikey_usb->regulator = devm_regulator_get(dev, "hub-vdd");
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if (IS_ERR(hisi_hikey_usb->regulator)) {
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if (PTR_ERR(hisi_hikey_usb->regulator) == -EPROBE_DEFER) {
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dev_info(dev, "waiting for hub-vdd-supply\n");
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return PTR_ERR(hisi_hikey_usb->regulator);
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}
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dev_err(dev, "get hub-vdd-supply failed with error %ld\n",
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PTR_ERR(hisi_hikey_usb->regulator));
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return PTR_ERR(hisi_hikey_usb->regulator);
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}
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ret = hisi_hikey_usb_of_role_switch(pdev, hisi_hikey_usb);
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if (ret)
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return ret;
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platform_set_drvdata(pdev, hisi_hikey_usb);
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return 0;
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}
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static int hisi_hikey_usb_remove(struct platform_device *pdev)
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{
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struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
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if (hisi_hikey_usb->hub_role_sw) {
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usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
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if (hisi_hikey_usb->dev_role_sw)
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usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
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} else {
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hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
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}
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return 0;
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}
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static const struct of_device_id id_table_hisi_hikey_usb[] = {
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{ .compatible = "hisilicon,usbhub" },
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{}
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};
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MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
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static struct platform_driver hisi_hikey_usb_driver = {
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.probe = hisi_hikey_usb_probe,
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.remove = hisi_hikey_usb_remove,
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.driver = {
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.name = DEVICE_DRIVER_NAME,
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.of_match_table = id_table_hisi_hikey_usb,
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},
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};
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module_platform_driver(hisi_hikey_usb_driver);
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MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
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MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
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MODULE_LICENSE("GPL v2");
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