linux-kernel - [PATCH 3/4] usb: phy: generic: Implement otg->set

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Message-Id: <20220114170941.800068-4-sean.anderson@seco.com>
Date:   Fri, 14 Jan 2022 12:09:40 -0500
From:   Sean Anderson <sean.anderson@...o.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Cc:     Robert Jarzmik <robert.jarzmik@...e.fr>,
        Felipe Balbi <balbi@...nel.org>, linux-kernel@...r.kernel.org,
        Sean Anderson <sean.anderson@...o.com>
Subject: [PATCH 3/4] usb: phy: generic: Implement otg->set_vbus

Some USB controller drivers call otg_set_vbus when entering host or
device mode. Implement this callback so that VBUS can be turned on and
off automatically. This is especially useful when there is no property
for a VBUS supply in the controller's binding.

This results in a change in semantics of the vbus_draw regulator.
Whereas before it represented the VBUS supplied by an A-Device when we
acted as a B-Device, now it represents an internal VBUS source.
Accordingly, we no longer set the current limit or enable/disable the
bus from nop_gpio_vbus_thread. Because this supply was never initialized
before the previous commit, there should be no change in behavior.

Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---

 drivers/usb/phy/phy-generic.c | 45 +++++++++++++----------------------
 1 file changed, 17 insertions(+), 28 deletions(-)

diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index 34b9f8140187..2c2553bc9b54 100644
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -68,33 +68,26 @@ static void nop_reset(struct usb_phy_generic *nop)
 }
 
 /* interface to regulator framework */
-static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
+static int nop_set_vbus(struct usb_otg *otg, bool enable)
 {
-	struct regulator *vbus_draw = nop->vbus_draw;
-	int enabled;
-	int ret;
+	int ret = 0;
+	struct usb_phy_generic *nop = dev_get_drvdata(otg->usb_phy->dev);
 
-	if (!vbus_draw)
-		return;
+	if (!nop->vbus_draw)
+		return 0;
 
-	enabled = nop->vbus_draw_enabled;
-	if (mA) {
-		regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
-		if (!enabled) {
-			ret = regulator_enable(vbus_draw);
-			if (ret < 0)
-				return;
-			nop->vbus_draw_enabled = 1;
-		}
-	} else {
-		if (enabled) {
-			ret = regulator_disable(vbus_draw);
-			if (ret < 0)
-				return;
-			nop->vbus_draw_enabled = 0;
-		}
+	if (enable && !nop->vbus_draw_enabled) {
+		ret = regulator_enable(nop->vbus_draw);
+		if (ret)
+			nop->vbus_draw_enabled = false;
+		else
+			nop->vbus_draw_enabled = true;
+
+	} else if (!enable && nop->vbus_draw_enabled) {
+		ret = regulator_disable(nop->vbus_draw);
+		nop->vbus_draw_enabled = false;
 	}
-	nop->mA = mA;
+	return ret;
 }
 
 
@@ -114,14 +107,9 @@ static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
 		otg->state = OTG_STATE_B_PERIPHERAL;
 		nop->phy.last_event = status;
 
-		/* drawing a "unit load" is *always* OK, except for OTG */
-		nop_set_vbus_draw(nop, 100);
-
 		atomic_notifier_call_chain(&nop->phy.notifier, status,
 					   otg->gadget);
 	} else {
-		nop_set_vbus_draw(nop, 0);
-
 		status = USB_EVENT_NONE;
 		otg->state = OTG_STATE_B_IDLE;
 		nop->phy.last_event = status;
@@ -285,6 +273,7 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop)
 	nop->phy.otg->usb_phy		= &nop->phy;
 	nop->phy.otg->set_host		= nop_set_host;
 	nop->phy.otg->set_peripheral	= nop_set_peripheral;
+	nop->phy.otg->set_vbus          = nop_set_vbus;
 
 	return 0;
 }
-- 
2.25.1