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From:   Li Jun <jun.li@nxp.com>
To:     myungjoo.ham@samsung.com, cw00.choi@samsung.com, krzk@kernel.org
Cc:     linux-kernel@vger.kernel.org, frank.li@nxp.com, xu.yang_2@nxp.com
Subject: [PATCH] extcon: ptn5150: add usb role class support
Date:   Wed,  6 Apr 2022 17:42:22 +0800
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Add support of usb role class consumer to do role switch.

Signed-off-by: Li Jun <jun.li@nxp.com>
---
 drivers/extcon/Kconfig          |  1 +
 drivers/extcon/extcon-ptn5150.c | 39 +++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index 0d42e49105dd..9828ade787a8 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -132,6 +132,7 @@ config EXTCON_PTN5150
 	tristate "NXP PTN5150 CC LOGIC USB EXTCON support"
 	depends on I2C && (GPIOLIB || COMPILE_TEST)
 	select REGMAP_I2C
+	select USB_ROLE_SWITCH
 	help
 	  Say Y here to enable support for USB peripheral and USB host
 	  detection by NXP PTN5150 CC (Configuration Channel) logic chip.
diff --git a/drivers/extcon/extcon-ptn5150.c b/drivers/extcon/extcon-ptn5150.c
index 5b9a3cf8df26..821b0f390308 100644
--- a/drivers/extcon/extcon-ptn5150.c
+++ b/drivers/extcon/extcon-ptn5150.c
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/extcon-provider.h>
 #include <linux/gpio/consumer.h>
+#include <linux/usb/role.h>
 
 /* PTN5150 registers */
 #define PTN5150_REG_DEVICE_ID			0x01
@@ -52,6 +53,7 @@ struct ptn5150_info {
 	int irq;
 	struct work_struct irq_work;
 	struct mutex mutex;
+	struct usb_role_switch *role_sw;
 };
 
 /* List of detectable cables */
@@ -85,6 +87,12 @@ static void ptn5150_check_state(struct ptn5150_info *info)
 		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false);
 		gpiod_set_value_cansleep(info->vbus_gpiod, 0);
 		extcon_set_state_sync(info->edev, EXTCON_USB, true);
+
+		ret = usb_role_switch_set_role(info->role_sw, USB_ROLE_DEVICE);
+		if (ret)
+			dev_err(info->dev, "failed to set device role: %d\n",
+				ret);
+
 		break;
 	case PTN5150_UFP_ATTACHED:
 		extcon_set_state_sync(info->edev, EXTCON_USB, false);
@@ -95,6 +103,12 @@ static void ptn5150_check_state(struct ptn5150_info *info)
 			gpiod_set_value_cansleep(info->vbus_gpiod, 1);
 
 		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);
+
+		ret = usb_role_switch_set_role(info->role_sw, USB_ROLE_HOST);
+		if (ret)
+			dev_err(info->dev, "failed to set host role: %d\n",
+				ret);
+
 		break;
 	default:
 		break;
@@ -133,6 +147,13 @@ static void ptn5150_irq_work(struct work_struct *work)
 			extcon_set_state_sync(info->edev,
 					EXTCON_USB, false);
 			gpiod_set_value_cansleep(info->vbus_gpiod, 0);
+
+			ret = usb_role_switch_set_role(info->role_sw,
+						       USB_ROLE_NONE);
+			if (ret)
+				dev_err(info->dev,
+					"failed to set none role: %d\n",
+					ret);
 		}
 	}
 
@@ -194,6 +215,14 @@ static int ptn5150_init_dev_type(struct ptn5150_info *info)
 	return 0;
 }
 
+static void ptn5150_put_role_sw(void *data)
+{
+	struct ptn5150_info *info = data;
+
+	cancel_work_sync(&info->irq_work);
+	usb_role_switch_put(info->role_sw);
+}
+
 static int ptn5150_i2c_probe(struct i2c_client *i2c)
 {
 	struct device *dev = &i2c->dev;
@@ -284,6 +313,16 @@ static int ptn5150_i2c_probe(struct i2c_client *i2c)
 	if (ret)
 		return -EINVAL;
 
+	info->role_sw = usb_role_switch_get(info->dev);
+	if (IS_ERR(info->role_sw))
+		return PTR_ERR(info->role_sw);
+
+	if (info->role_sw) {
+		ret = devm_add_action_or_reset(dev, ptn5150_put_role_sw, info);
+		if (ret)
+			return ret;
+	}
+
 	/*
 	 * Update current extcon state if for example OTG connection was there
 	 * before the probe
-- 
2.25.1