[PATCH 1/3] usb: common: usb-conn-gpio: fix NULL pointer dereference of charger

[PATCH 1/3] usb: common: usb-conn-gpio: fix NULL pointer dereference of charger

[Chunfeng Yun]

When power on system with OTG cable, IDDIG's interrupt arises before
the charger registration, it will cause a NULL pointer dereference,
fix the issue by registering the power supply before requesting
IDDIG/VBUS irq.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
 drivers/usb/common/usb-conn-gpio.c | 44 ++++++++++++++++++------------
 1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index 6c4e3a19f42c..c9545a4eff66 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -149,14 +149,32 @@ static int usb_charger_get_property(struct power_supply *psy,
 	return 0;
 }
 
-static int usb_conn_probe(struct platform_device *pdev)
+static int usb_conn_psy_register(struct usb_conn_info *info)
 {
-	struct device *dev = &pdev->dev;
-	struct power_supply_desc *desc;
-	struct usb_conn_info *info;
+	struct device *dev = info->dev;
+	struct power_supply_desc *desc = &info->desc;
 	struct power_supply_config cfg = {
 		.of_node = dev->of_node,
 	};
+
+	desc->name = "usb-charger";
+	desc->properties = usb_charger_properties;
+	desc->num_properties = ARRAY_SIZE(usb_charger_properties);
+	desc->get_property = usb_charger_get_property;
+	desc->type = POWER_SUPPLY_TYPE_USB;
+	cfg.drv_data = info;
+
+	info->charger = devm_power_supply_register(dev, desc, &cfg);
+	if (IS_ERR(info->charger))
+		dev_err(dev, "Unable to register charger\n");
+
+	return PTR_ERR_OR_ZERO(info->charger);
+}
+
+static int usb_conn_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct usb_conn_info *info;
 	bool need_vbus = true;
 	int ret = 0;
 
@@ -218,6 +236,10 @@ static int usb_conn_probe(struct platform_device *pdev)
 		return PTR_ERR(info->role_sw);
 	}
 
+	ret = usb_conn_psy_register(info);
+	if (ret)
+		goto put_role_sw;
+
 	if (info->id_gpiod) {
 		info->id_irq = gpiod_to_irq(info->id_gpiod);
 		if (info->id_irq < 0) {
@@ -252,20 +274,6 @@ static int usb_conn_probe(struct platform_device *pdev)
 		}
 	}
 
-	desc = &info->desc;
-	desc->name = "usb-charger";
-	desc->properties = usb_charger_properties;
-	desc->num_properties = ARRAY_SIZE(usb_charger_properties);
-	desc->get_property = usb_charger_get_property;
-	desc->type = POWER_SUPPLY_TYPE_USB;
-	cfg.drv_data = info;
-
-	info->charger = devm_power_supply_register(dev, desc, &cfg);
-	if (IS_ERR(info->charger)) {
-		dev_err(dev, "Unable to register charger\n");
-		return PTR_ERR(info->charger);
-	}
-
 	platform_set_drvdata(pdev, info);
 
 	/* Perform initial detection */
-- 
2.18.0
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[PATCH 2/3] usb: common: usb-conn-gpio: use dev_err_probe() to print log

[Chunfeng Yun]

Use dev_err_probe() to print debug or error message depending on
whether the error value is -DPROBE_DEFER or not.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
 drivers/usb/common/usb-conn-gpio.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index c9545a4eff66..dfbbc4f51ed6 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -223,18 +223,14 @@ static int usb_conn_probe(struct platform_device *pdev)
 	}
 
 	if (IS_ERR(info->vbus)) {
-		if (PTR_ERR(info->vbus) != -EPROBE_DEFER)
-			dev_err(dev, "failed to get vbus: %ld\n", PTR_ERR(info->vbus));
-		return PTR_ERR(info->vbus);
+		ret = PTR_ERR(info->vbus);
+		return dev_err_probe(dev, ret, "failed to get vbus :%d\n", ret);
 	}
 
 	info->role_sw = usb_role_switch_get(dev);
-	if (IS_ERR(info->role_sw)) {
-		if (PTR_ERR(info->role_sw) != -EPROBE_DEFER)
-			dev_err(dev, "failed to get role switch\n");
-
-		return PTR_ERR(info->role_sw);
-	}
+	if (IS_ERR(info->role_sw))
+		return dev_err_probe(dev, PTR_ERR(info->role_sw),
+				     "failed to get role switch\n");
 
 	ret = usb_conn_psy_register(info);
 	if (ret)
-- 
2.18.0
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[PATCH 3/3] Revert "usb: common: usb-conn-gpio: Make VBUS supply optional"

[Chunfeng Yun]

Vbus is already an optional supply, if the vbus-supply is not
provided in DTS, will use a dummy regulator,
the warning log is as below:
"supply vbus not found, using dummy regulator"

This reverts commit 4ddf1ac79e5f082451cd549283d2eb7559ab6ca9.

Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
 drivers/usb/common/usb-conn-gpio.c | 29 ++++++-----------------------
 1 file changed, 6 insertions(+), 23 deletions(-)

diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index dfbbc4f51ed6..143bbd8f557a 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -91,14 +91,14 @@ static void usb_conn_detect_cable(struct work_struct *work)
 		return;
 	}
 
-	if (info->last_role == USB_ROLE_HOST && info->vbus)
+	if (info->last_role == USB_ROLE_HOST)
 		regulator_disable(info->vbus);
 
 	ret = usb_role_switch_set_role(info->role_sw, role);
 	if (ret)
 		dev_err(info->dev, "failed to set role: %d\n", ret);
 
-	if (role == USB_ROLE_HOST && info->vbus) {
+	if (role == USB_ROLE_HOST) {
 		ret = regulator_enable(info->vbus);
 		if (ret)
 			dev_err(info->dev, "enable vbus regulator failed\n");
@@ -106,9 +106,8 @@ static void usb_conn_detect_cable(struct work_struct *work)
 
 	info->last_role = role;
 
-	if (info->vbus)
-		dev_dbg(info->dev, "vbus regulator is %s\n",
-			regulator_is_enabled(info->vbus) ? "enabled" : "disabled");
+	dev_dbg(info->dev, "vbus regulator is %s\n",
+		regulator_is_enabled(info->vbus) ? "enabled" : "disabled");
 
 	power_supply_changed(info->charger);
 }
@@ -205,23 +204,7 @@ static int usb_conn_probe(struct platform_device *pdev)
 
 	INIT_DELAYED_WORK(&info->dw_det, usb_conn_detect_cable);
 
-	/*
-	 * If the USB connector is a child of a USB port and that port already provides the VBUS
-	 * supply, there's no need for the USB connector to provide it again.
-	 */
-	if (dev->parent && dev->parent->of_node) {
-		if (of_find_property(dev->parent->of_node, "vbus-supply", NULL))
-			need_vbus = false;
-	}
-
-	if (!need_vbus) {
-		info->vbus = devm_regulator_get_optional(dev, "vbus");
-		if (PTR_ERR(info->vbus) == -ENODEV)
-			info->vbus = NULL;
-	} else {
-		info->vbus = devm_regulator_get(dev, "vbus");
-	}
-
+	info->vbus = devm_regulator_get(dev, "vbus");
 	if (IS_ERR(info->vbus)) {
 		ret = PTR_ERR(info->vbus);
 		return dev_err_probe(dev, ret, "failed to get vbus :%d\n", ret);
@@ -288,7 +271,7 @@ static int usb_conn_remove(struct platform_device *pdev)
 
 	cancel_delayed_work_sync(&info->dw_det);
 
-	if (info->last_role == USB_ROLE_HOST && info->vbus)
+	if (info->last_role == USB_ROLE_HOST)
 		regulator_disable(info->vbus);
 
 	usb_role_switch_put(info->role_sw);
-- 
2.18.0
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