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// SPDX-License-Identifier: GPL-2.0
/*
* Support for usb functionality of Hikey series boards
* based on Hisilicon Kirin Soc.
*
* Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
* http://www.huawei.com
*
* Authors: Yu Chen <chenyu56@huawei.com>
*/
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/usb/role.h>
#define DEVICE_DRIVER_NAME "hisi_hikey_usb"
#define HUB_VBUS_POWER_ON 1
#define HUB_VBUS_POWER_OFF 0
#define USB_SWITCH_TO_HUB 1
#define USB_SWITCH_TO_TYPEC 0
#define TYPEC_VBUS_POWER_ON 1
#define TYPEC_VBUS_POWER_OFF 0
struct hisi_hikey_usb {
struct gpio_desc *otg_switch;
struct gpio_desc *typec_vbus;
struct gpio_desc *hub_vbus;
struct usb_role_switch *hub_role_sw;
struct usb_role_switch *dev_role_sw;
enum usb_role role;
struct mutex lock;
struct work_struct work;
struct notifier_block nb;
};
static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
{
gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value);
}
static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int switch_to)
{
gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
}
static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int value)
{
gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
}
static void relay_set_role_switch(struct work_struct *work)
{
struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
struct hisi_hikey_usb,
work);
struct usb_role_switch *sw;
enum usb_role role;
if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
return;
mutex_lock(&hisi_hikey_usb->lock);
switch (hisi_hikey_usb->role) {
case USB_ROLE_NONE:
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
break;
case USB_ROLE_HOST:
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
break;
case USB_ROLE_DEVICE:
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
break;
default:
break;
}
sw = hisi_hikey_usb->dev_role_sw;
role = hisi_hikey_usb->role;
mutex_unlock(&hisi_hikey_usb->lock);
usb_role_switch_set_role(sw, role);
}
static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
{
struct hisi_hikey_usb *hisi_hikey_usb = usb_role_switch_get_drvdata(sw);
if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
return -EINVAL;
mutex_lock(&hisi_hikey_usb->lock);
hisi_hikey_usb->role = role;
mutex_unlock(&hisi_hikey_usb->lock);
schedule_work(&hisi_hikey_usb->work);
return 0;
}
static int hisi_hikey_usb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct hisi_hikey_usb *hisi_hikey_usb;
struct usb_role_switch_desc hub_role_switch = {NULL};
hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
if (!hisi_hikey_usb)
return -ENOMEM;
hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
GPIOD_OUT_LOW);
if (IS_ERR(hisi_hikey_usb->typec_vbus))
return PTR_ERR(hisi_hikey_usb->typec_vbus);
hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
GPIOD_OUT_HIGH);
if (IS_ERR(hisi_hikey_usb->otg_switch))
return PTR_ERR(hisi_hikey_usb->otg_switch);
/* hub-vdd33-en is optional */
hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
GPIOD_OUT_HIGH);
if (IS_ERR(hisi_hikey_usb->hub_vbus))
return PTR_ERR(hisi_hikey_usb->hub_vbus);
hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
if (!hisi_hikey_usb->dev_role_sw)
return -EPROBE_DEFER;
if (IS_ERR(hisi_hikey_usb->dev_role_sw))
return PTR_ERR(hisi_hikey_usb->dev_role_sw);
INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
mutex_init(&hisi_hikey_usb->lock);
hub_role_switch.fwnode = dev_fwnode(dev);
hub_role_switch.set = hub_usb_role_switch_set;
hub_role_switch.driver_data = hisi_hikey_usb;
hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
&hub_role_switch);
if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
return PTR_ERR(hisi_hikey_usb->hub_role_sw);
}
platform_set_drvdata(pdev, hisi_hikey_usb);
return 0;
}
static int hisi_hikey_usb_remove(struct platform_device *pdev)
{
struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
if (hisi_hikey_usb->hub_role_sw)
usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
if (hisi_hikey_usb->dev_role_sw)
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
return 0;
}
static const struct of_device_id id_table_hisi_hikey_usb[] = {
{.compatible = "hisilicon,gpio_hubv1"},
{}
};
MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
static struct platform_driver hisi_hikey_usb_driver = {
.probe = hisi_hikey_usb_probe,
.remove = hisi_hikey_usb_remove,
.driver = {
.name = DEVICE_DRIVER_NAME,
.of_match_table = id_table_hisi_hikey_usb,
},
};
module_platform_driver(hisi_hikey_usb_driver);
MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
MODULE_LICENSE("GPL v2");
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