linux-kernel - [PATCH 7/7] usb: dwc3: qcom: Enable gpio-usb-conn based role-switching

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Date:   Wed, 11 Mar 2020 19:15:01 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     balbi@...nel.org, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org, jackp@...eaurora.org, robh@...nel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 7/7] usb: dwc3: qcom: Enable gpio-usb-conn based role-switching

This patch adds the ability to receive a notification from the DRD code for
role-switch events and in doing so it introduces a disjunction between
gpio-usb-conn or extcon mode.

This is what we want to do, since the two methods are mutually exclusive.

Cc: Andy Gross <agross@...nel.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Felipe Balbi <balbi@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Jack Pham <jackp@...eaurora.org>
Cc: linux-arm-msm@...r.kernel.org
Cc: linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Tested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 6f4b2b3cffce..f6a7ede5953e 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -571,6 +571,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	struct device		*dev = &pdev->dev;
 	struct dwc3_qcom	*qcom;
 	struct resource		*res, *parent_res = NULL;
+	struct dwc3		*dwc;
 	int			ret, i;
 	bool			ignore_pipe_clk;
 
@@ -669,8 +670,16 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	if (qcom->mode == USB_DR_MODE_PERIPHERAL)
 		dwc3_qcom_vbus_overrride_enable(qcom, true);
 
-	/* register extcon to override sw_vbus on Vbus change later */
-	ret = dwc3_qcom_register_extcon(qcom);
+	if (dwc3_qcom_find_gpio_usb_connector(qcom->dwc3)) {
+		/* Using gpio-usb-conn register a notifier for VBUS */
+		dwc = platform_get_drvdata(qcom->dwc3);
+		qcom->vbus_nb.notifier_call = dwc3_qcom_vbus_notifier;
+		ret = dwc3_role_switch_notifier_register(dwc, &qcom->vbus_nb);
+	} else {
+		/* register extcon to override sw_vbus on Vbus change later */
+		ret = dwc3_qcom_register_extcon(qcom);
+	}
+
 	if (ret)
 		goto depopulate;
 
@@ -702,8 +711,11 @@ static int dwc3_qcom_remove(struct platform_device *pdev)
 {
 	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
+	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
 	int i;
 
+	dwc3_role_switch_notifier_unregister(dwc, &qcom->vbus_nb);
+
 	of_platform_depopulate(dev);
 
 	for (i = qcom->num_clocks - 1; i >= 0; i--) {
-- 
2.25.1