Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Andy Shevchenko <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: John Stultz <redacted>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Yu Chen <chenyu56@huawei.com>
---
v1:
* Using gpiod API with the gpios.
* Removing registering usb role switch.
* Registering usb role switch notifier.
v2:
* Fix license declaration.
* Add configuration of  gpio direction.
* Remove some log print.
v3:
* Remove property of "typec_vbus_enable_val".
* Remove gpiod_direction_output and set initial value of gpio by
* devm_gpiod_get.
v4:
* Remove 'linux/of.h' and add 'linux/mod_devicetable.h'.
* Remove unused 'root' of_node.
* Remove unuseful NULL check return by 'devm_gpiod_get'.
* Use 'devm_gpiod_get_optional' to get optional gpio.
---
---
 drivers/misc/Kconfig          |   6 ++
 drivers/misc/Makefile         |   1 +
 drivers/misc/hisi_hikey_usb.c | 162 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+)
 create mode 100644 drivers/misc/hisi_hikey_usb.c

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 42ab8ec92a04..3b3f610b80c2 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig

@@ -532,6 +532,12 @@ config PVPANIC
          a paravirtualized device provided by QEMU; it lets a virtual machine
          (guest) communicate panic events to the host.

+config HISI_HIKEY_USB
+       tristate "USB functionality of HiSilicon Hikey Platform"
+       depends on OF && GPIOLIB
+       help
+         If you say yes here you get support for usb functionality of HiSilicon Hikey Platform.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"

diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index d5b7d3404dc7..1c6c108d3a0c 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile

@@ -61,3 +61,4 @@ obj-$(CONFIG_OCXL)            += ocxl/
 obj-y                          += cardreader/
 obj-$(CONFIG_PVPANIC)          += pvpanic.o
 obj-$(CONFIG_HABANA_AI)                += habanalabs/
+obj-$(CONFIG_HISI_HIKEY_USB)   += hisi_hikey_usb.o

diff --git a/drivers/misc/hisi_hikey_usb.c b/drivers/misc/hisi_hikey_usb.c
new file mode 100644
index 000000000000..a3bb46266f04
--- /dev/null
+++ b/drivers/misc/hisi_hikey_usb.c

@@ -0,0 +1,162 @@
+// 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/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 *role_sw;
+       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 int hisi_hikey_role_switch(struct notifier_block *nb,
+                       unsigned long state, void *data)
+{
+       struct hisi_hikey_usb *hisi_hikey_usb;
+
+       hisi_hikey_usb = container_of(nb, struct hisi_hikey_usb, nb);
+
+       switch (state) {
+       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:
+               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;
+       }
+
+       return 0;
+}
+
+static int hisi_hikey_usb_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct hisi_hikey_usb *hisi_hikey_usb;
+       int ret;
+
+       hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
+       if (!hisi_hikey_usb)
+               return -ENOMEM;
+
+       hisi_hikey_usb->nb.notifier_call = hisi_hikey_role_switch;
+
+       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->role_sw = usb_role_switch_get(dev);
+       if (!hisi_hikey_usb->role_sw)
+               return -EPROBE_DEFER;
+       if (IS_ERR(hisi_hikey_usb->role_sw))
+               return PTR_ERR(hisi_hikey_usb->role_sw);
+
+       ret = usb_role_switch_register_notifier(hisi_hikey_usb->role_sw,
+                       &hisi_hikey_usb->nb);
+       if (ret) {
+               usb_role_switch_put(hisi_hikey_usb->role_sw);
+               return ret;
+       }
+
+       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);
+
+       usb_role_switch_unregister_notifier(hisi_hikey_usb->role_sw,
+                       &hisi_hikey_usb->nb);
+
+       usb_role_switch_put(hisi_hikey_usb->role_sw);
+
+       return 0;
+}
+
+static const struct of_device_id id_table_hisi_hikey_usb[] = {
+       {.compatible = "hisilicon,gpio_hubv1"},
+       {.compatible = "hisilicon,hikey960_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");
--

2.15.0-rc2