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authorSean Anderson <sean.anderson@seco.com>2024-01-24 01:51:10 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2024-01-28 04:37:22 +0300
commit562898808cb17fdea92953e6a69c193b783d7b3f (patch)
treeb82a9482056c57023cda7e3bd57ffb5bbb4358df
parent75fd6485cccef269ac9eb3b71cf56753341195ef (diff)
downloadlinux-562898808cb17fdea92953e6a69c193b783d7b3f.tar.xz
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@seco.com> Link: https://lore.kernel.org/r/20240123225111.1629405-4-sean.anderson@seco.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/phy/phy-generic.c45
1 files changed, 17 insertions, 28 deletions
diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index 16494030209e..f7db24b5ed5c 100644
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -74,33 +74,26 @@ 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;
}
@@ -120,14 +113,9 @@ 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;
@@ -291,6 +279,7 @@ 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;
}