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Subject[PATCH 3/5] usb: musb: ux500: add otg notifier support
Date
Add transceiver notifier event handling to the ux500 driver to set vbus
on specific transceiver events.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
---
drivers/usb/musb/ux500.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)

diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c
index 5b742ba..b20326bb 100644
--- a/drivers/usb/musb/ux500.c
+++ b/drivers/usb/musb/ux500.c
@@ -98,6 +98,36 @@ static void ux500_musb_set_vbus(struct musb *musb, int is_on)
musb_readb(musb->mregs, MUSB_DEVCTL));
}

+static int musb_otg_notifications(struct notifier_block *nb,
+ unsigned long event, void *unused)
+{
+ struct musb *musb = container_of(nb, struct musb, nb);
+
+ dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
+ event, otg_state_string(musb->xceiv->state));
+
+ switch (event) {
+ case USB_EVENT_ID:
+ dev_dbg(musb->controller, "ID GND\n");
+ ux500_musb_set_vbus(musb, 1);
+ break;
+ case USB_EVENT_VBUS:
+ dev_dbg(musb->controller, "VBUS Connect\n");
+ break;
+ case USB_EVENT_NONE:
+ dev_dbg(musb->controller, "VBUS Disconnect\n");
+ if (is_host_active(musb))
+ ux500_musb_set_vbus(musb, 0);
+ else
+ musb->xceiv->state = OTG_STATE_B_IDLE;
+ break;
+ default:
+ dev_dbg(musb->controller, "ID float\n");
+ return NOTIFY_DONE;
+ }
+ return NOTIFY_OK;
+}
+
static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
{
unsigned long flags;
@@ -120,12 +150,21 @@ static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)

static int ux500_musb_init(struct musb *musb)
{
+ int status;
+
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(musb->xceiv)) {
pr_err("HS USB OTG: no transceiver configured\n");
return -EPROBE_DEFER;
}

+ musb->nb.notifier_call = musb_otg_notifications;
+ status = usb_register_notifier(musb->xceiv, &musb->nb);
+ if (status < 0) {
+ dev_dbg(musb->controller, "notification register failed\n");
+ return status;
+ }
+
musb->isr = ux500_musb_interrupt;

return 0;
@@ -133,6 +172,8 @@ static int ux500_musb_init(struct musb *musb)

static int ux500_musb_exit(struct musb *musb)
{
+ usb_unregister_notifier(musb->xceiv, &musb->nb);
+
usb_put_phy(musb->xceiv);

return 0;
--
1.8.1.3


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