--- /dev/null
+// 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");
projects / kernel.git / commitdiff