usb: fix building musb drivers

Commit 3dacdf11 "usb: factor out state_string() on otg drivers"
broke building musb drivers since there is already another
otg_state_string() function in musb drivers, but with different
prototype. Fix musb drivers to use common otg_state_string(), too.

Also provide a nop for otg_state_string() if CONFIG_USB_OTG_UTILS
is not defined.
Signed-off-by: NAnatolij Gustschin <agust@denx.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/musb/am35x.c

@@ -151,7 +151,8 @@ static void otg_timer(unsigned long _musb)
 	 * status change events (from the transceiver) otherwise.
 	 */
 	devctl = musb_readb(mregs, MUSB_DEVCTL);
-	DBG(7, "Poll devctl %02x (%s)\n", devctl, otg_state_string(musb));
+	DBG(7, "Poll devctl %02x (%s)\n", devctl,
+		otg_state_string(musb->xceiv->state));
 
 	spin_lock_irqsave(&musb->lock, flags);
 	switch (musb->xceiv->state) {
@@ -202,7 +203,8 @@ static void am35x_musb_try_idle(struct musb *musb, unsigned long timeout)
 	/* Never idle if active, or when VBUS timeout is not set as host */
 	if (musb->is_active || (musb->a_wait_bcon == 0 &&
 				musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) {
-		DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
+		DBG(4, "%s active, deleting timer\n",
+			otg_state_string(musb->xceiv->state));
 		del_timer(&otg_workaround);
 		last_timer = jiffies;
 		return;
@@ -215,7 +217,8 @@ static void am35x_musb_try_idle(struct musb *musb, unsigned long timeout)
 	last_timer = timeout;
 
 	DBG(4, "%s inactive, starting idle timer for %u ms\n",
-	    otg_state_string(musb), jiffies_to_msecs(timeout - jiffies));
+		otg_state_string(musb->xceiv->state),
+		jiffies_to_msecs(timeout - jiffies));
 	mod_timer(&otg_workaround, timeout);
 }
 
@@ -304,7 +307,7 @@ static irqreturn_t am35x_musb_interrupt(int irq, void *hci)
 		/* NOTE: this must complete power-on within 100 ms. */
 		DBG(2, "VBUS %s (%s)%s, devctl %02x\n",
 				drvvbus ? "on" : "off",
-				otg_state_string(musb),
+				otg_state_string(musb->xceiv->state),
 				err ? " ERROR" : "",
 				devctl);
 		ret = IRQ_HANDLED;

drivers/usb/musb/blackfin.c

@@ -279,12 +279,13 @@ static void musb_conn_timer_handler(unsigned long _musb)
 		}
 		break;
 	default:
-		DBG(1, "%s state not handled\n", otg_state_string(musb));
+		DBG(1, "%s state not handled\n",
+			otg_state_string(musb->xceiv->state));
 		break;
 	}
 	spin_unlock_irqrestore(&musb->lock, flags);
 
-	DBG(4, "state is %s\n", otg_state_string(musb));
+	DBG(4, "state is %s\n", otg_state_string(musb->xceiv->state));
 }
 
 static void bfin_musb_enable(struct musb *musb)
@@ -308,7 +309,7 @@ static void bfin_musb_set_vbus(struct musb *musb, int is_on)
 
 	DBG(1, "VBUS %s, devctl %02x "
 		/* otg %3x conf %08x prcm %08x */ "\n",
-		otg_state_string(musb),
+		otg_state_string(musb->xceiv->state),
 		musb_readb(musb->mregs, MUSB_DEVCTL));
 }
 

drivers/usb/musb/da8xx.c

@@ -199,7 +199,8 @@ static void otg_timer(unsigned long _musb)
 	 * status change events (from the transceiver) otherwise.
 	 */
 	devctl = musb_readb(mregs, MUSB_DEVCTL);
-	DBG(7, "Poll devctl %02x (%s)\n", devctl, otg_state_string(musb));
+	DBG(7, "Poll devctl %02x (%s)\n", devctl,
+		otg_state_string(musb->xceiv->state));
 
 	spin_lock_irqsave(&musb->lock, flags);
 	switch (musb->xceiv->state) {
@@ -273,7 +274,8 @@ static void da8xx_musb_try_idle(struct musb *musb, unsigned long timeout)
 	/* Never idle if active, or when VBUS timeout is not set as host */
 	if (musb->is_active || (musb->a_wait_bcon == 0 &&
 				musb->xceiv->state == OTG_STATE_A_WAIT_BCON)) {
-		DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
+		DBG(4, "%s active, deleting timer\n",
+			otg_state_string(musb->xceiv->state));
 		del_timer(&otg_workaround);
 		last_timer = jiffies;
 		return;
@@ -286,7 +288,8 @@ static void da8xx_musb_try_idle(struct musb *musb, unsigned long timeout)
 	last_timer = timeout;
 
 	DBG(4, "%s inactive, starting idle timer for %u ms\n",
-	    otg_state_string(musb), jiffies_to_msecs(timeout - jiffies));
+		otg_state_string(musb->xceiv->state),
+		jiffies_to_msecs(timeout - jiffies));
 	mod_timer(&otg_workaround, timeout);
 }
 
@@ -365,7 +368,7 @@ static irqreturn_t da8xx_musb_interrupt(int irq, void *hci)
 
 		DBG(2, "VBUS %s (%s)%s, devctl %02x\n",
 				drvvbus ? "on" : "off",
-				otg_state_string(musb),
+				otg_state_string(musb->xceiv->state),
 				err ? " ERROR" : "",
 				devctl);
 		ret = IRQ_HANDLED;

drivers/usb/musb/davinci.c

@@ -220,7 +220,8 @@ static void otg_timer(unsigned long _musb)
 	* status change events (from the transceiver) otherwise.
 	 */
 	devctl = musb_readb(mregs, MUSB_DEVCTL);
-	DBG(7, "poll devctl %02x (%s)\n", devctl, otg_state_string(musb));
+	DBG(7, "poll devctl %02x (%s)\n", devctl,
+		otg_state_string(musb->xceiv->state));
 
 	spin_lock_irqsave(&musb->lock, flags);
 	switch (musb->xceiv->state) {
@@ -356,7 +357,7 @@ static irqreturn_t davinci_musb_interrupt(int irq, void *__hci)
 		davinci_musb_source_power(musb, drvvbus, 0);
 		DBG(2, "VBUS %s (%s)%s, devctl %02x\n",
 				drvvbus ? "on" : "off",
-				otg_state_string(musb),
+				otg_state_string(musb->xceiv->state),
 				err ? " ERROR" : "",
 				devctl);
 		retval = IRQ_HANDLED;

drivers/usb/musb/musb_core.c

@@ -333,26 +333,6 @@ void musb_load_testpacket(struct musb *musb)
 
 /*-------------------------------------------------------------------------*/
 
-const char *otg_state_string(struct musb *musb)
-{
-	switch (musb->xceiv->state) {
-	case OTG_STATE_A_IDLE:		return "a_idle";
-	case OTG_STATE_A_WAIT_VRISE:	return "a_wait_vrise";
-	case OTG_STATE_A_WAIT_BCON:	return "a_wait_bcon";
-	case OTG_STATE_A_HOST:		return "a_host";
-	case OTG_STATE_A_SUSPEND:	return "a_suspend";
-	case OTG_STATE_A_PERIPHERAL:	return "a_peripheral";
-	case OTG_STATE_A_WAIT_VFALL:	return "a_wait_vfall";
-	case OTG_STATE_A_VBUS_ERR:	return "a_vbus_err";
-	case OTG_STATE_B_IDLE:		return "b_idle";
-	case OTG_STATE_B_SRP_INIT:	return "b_srp_init";
-	case OTG_STATE_B_PERIPHERAL:	return "b_peripheral";
-	case OTG_STATE_B_WAIT_ACON:	return "b_wait_acon";
-	case OTG_STATE_B_HOST:		return "b_host";
-	default:			return "UNDEFINED";
-	}
-}
-
 #ifdef	CONFIG_USB_MUSB_OTG
 
 /*
@@ -373,12 +353,14 @@ void musb_otg_timer_func(unsigned long data)
 		break;
 	case OTG_STATE_A_SUSPEND:
 	case OTG_STATE_A_WAIT_BCON:
-		DBG(1, "HNP: %s timeout\n", otg_state_string(musb));
+		DBG(1, "HNP: %s timeout\n",
+			otg_state_string(musb->xceiv->state));
 		musb_platform_set_vbus(musb, 0);
 		musb->xceiv->state = OTG_STATE_A_WAIT_VFALL;
 		break;
 	default:
-		DBG(1, "HNP: Unhandled mode %s\n", otg_state_string(musb));
+		DBG(1, "HNP: Unhandled mode %s\n",
+			otg_state_string(musb->xceiv->state));
 	}
 	musb->ignore_disconnect = 0;
 	spin_unlock_irqrestore(&musb->lock, flags);
@@ -393,12 +375,13 @@ void musb_hnp_stop(struct musb *musb)
 	void __iomem	*mbase = musb->mregs;
 	u8	reg;
 
-	DBG(1, "HNP: stop from %s\n", otg_state_string(musb));
+	DBG(1, "HNP: stop from %s\n", otg_state_string(musb->xceiv->state));
 
 	switch (musb->xceiv->state) {
 	case OTG_STATE_A_PERIPHERAL:
 		musb_g_disconnect(musb);
-		DBG(1, "HNP: back to %s\n", otg_state_string(musb));
+		DBG(1, "HNP: back to %s\n",
+			otg_state_string(musb->xceiv->state));
 		break;
 	case OTG_STATE_B_HOST:
 		DBG(1, "HNP: Disabling HR\n");
@@ -412,7 +395,7 @@ void musb_hnp_stop(struct musb *musb)
 		break;
 	default:
 		DBG(1, "HNP: Stopping in unknown state %s\n",
-			otg_state_string(musb));
+			otg_state_string(musb->xceiv->state));
 	}
 
 	/*
@@ -451,7 +434,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 	 */
 	if (int_usb & MUSB_INTR_RESUME) {
 		handled = IRQ_HANDLED;
-		DBG(3, "RESUME (%s)\n", otg_state_string(musb));
+		DBG(3, "RESUME (%s)\n", otg_state_string(musb->xceiv->state));
 
 		if (devctl & MUSB_DEVCTL_HM) {
 #ifdef CONFIG_USB_MUSB_HDRC_HCD
@@ -492,7 +475,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 			default:
 				WARNING("bogus %s RESUME (%s)\n",
 					"host",
-					otg_state_string(musb));
+					otg_state_string(musb->xceiv->state));
 			}
 #endif
 		} else {
@@ -526,7 +509,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 			default:
 				WARNING("bogus %s RESUME (%s)\n",
 					"peripheral",
-					otg_state_string(musb));
+					otg_state_string(musb->xceiv->state));
 			}
 		}
 	}
@@ -542,7 +525,8 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 			return IRQ_HANDLED;
 		}
 
-		DBG(1, "SESSION_REQUEST (%s)\n", otg_state_string(musb));
+		DBG(1, "SESSION_REQUEST (%s)\n",
+			otg_state_string(musb->xceiv->state));
 
 		/* IRQ arrives from ID pin sense or (later, if VBUS power
 		 * is removed) SRP.  responses are time critical:
@@ -607,7 +591,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 		}
 
 		DBG(1, "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n",
-				otg_state_string(musb),
+				otg_state_string(musb->xceiv->state),
 				devctl,
 				({ char *s;
 				switch (devctl & MUSB_DEVCTL_VBUS) {
@@ -633,7 +617,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 #endif
 	if (int_usb & MUSB_INTR_SUSPEND) {
 		DBG(1, "SUSPEND (%s) devctl %02x power %02x\n",
-				otg_state_string(musb), devctl, power);
+			otg_state_string(musb->xceiv->state), devctl, power);
 		handled = IRQ_HANDLED;
 
 		switch (musb->xceiv->state) {
@@ -758,13 +742,13 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 			usb_hcd_resume_root_hub(hcd);
 
 		DBG(1, "CONNECT (%s) devctl %02x\n",
-				otg_state_string(musb), devctl);
+				otg_state_string(musb->xceiv->state), devctl);
 	}
 #endif	/* CONFIG_USB_MUSB_HDRC_HCD */
 
 	if ((int_usb & MUSB_INTR_DISCONNECT) && !musb->ignore_disconnect) {
 		DBG(1, "DISCONNECT (%s) as %s, devctl %02x\n",
-				otg_state_string(musb),
+				otg_state_string(musb->xceiv->state),
 				MUSB_MODE(musb), devctl);
 		handled = IRQ_HANDLED;
 
@@ -807,7 +791,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 #endif	/* GADGET */
 		default:
 			WARNING("unhandled DISCONNECT transition (%s)\n",
-				otg_state_string(musb));
+				otg_state_string(musb->xceiv->state));
 			break;
 		}
 	}
@@ -832,7 +816,8 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 				musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
 			}
 		} else if (is_peripheral_capable()) {
-			DBG(1, "BUS RESET as %s\n", otg_state_string(musb));
+			DBG(1, "BUS RESET as %s\n",
+				otg_state_string(musb->xceiv->state));
 			switch (musb->xceiv->state) {
 #ifdef CONFIG_USB_OTG
 			case OTG_STATE_A_SUSPEND:
@@ -846,8 +831,8 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 			case OTG_STATE_A_WAIT_BCON:	/* OPT TD.4.7-900ms */
 				/* never use invalid T(a_wait_bcon) */
 				DBG(1, "HNP: in %s, %d msec timeout\n",
-						otg_state_string(musb),
-						TA_WAIT_BCON(musb));
+					otg_state_string(musb->xceiv->state),
+					TA_WAIT_BCON(musb));
 				mod_timer(&musb->otg_timer, jiffies
 					+ msecs_to_jiffies(TA_WAIT_BCON(musb)));
 				break;
@@ -858,7 +843,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 				break;
 			case OTG_STATE_B_WAIT_ACON:
 				DBG(1, "HNP: RESET (%s), to b_peripheral\n",
-					otg_state_string(musb));
+					otg_state_string(musb->xceiv->state));
 				musb->xceiv->state = OTG_STATE_B_PERIPHERAL;
 				musb_g_reset(musb);
 				break;
@@ -871,7 +856,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 				break;
 			default:
 				DBG(1, "Unhandled BUS RESET as %s\n",
-					otg_state_string(musb));
+					otg_state_string(musb->xceiv->state));
 			}
 		}
 	}
@@ -1713,7 +1698,7 @@ musb_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 	int ret = -EINVAL;
 
 	spin_lock_irqsave(&musb->lock, flags);
-	ret = sprintf(buf, "%s\n", otg_state_string(musb));
+	ret = sprintf(buf, "%s\n", otg_state_string(musb->xceiv->state));
 	spin_unlock_irqrestore(&musb->lock, flags);
 
 	return ret;

drivers/usb/musb/musb_debug.h

@@ -54,8 +54,6 @@ static inline int _dbg_level(unsigned l)
 	return musb_debug >= l;
 }
 
-extern const char *otg_state_string(struct musb *);
-
 #ifdef CONFIG_DEBUG_FS
 extern int musb_init_debugfs(struct musb *musb);
 extern void musb_exit_debugfs(struct musb *musb);

drivers/usb/musb/musb_gadget.c

@@ -1556,7 +1556,8 @@ static int musb_gadget_wakeup(struct usb_gadget *gadget)
 		status = 0;
 		goto done;
 	default:
-		DBG(2, "Unhandled wake: %s\n", otg_state_string(musb));
+		DBG(2, "Unhandled wake: %s\n",
+			otg_state_string(musb->xceiv->state));
 		goto done;
 	}
 
@@ -2039,7 +2040,7 @@ void musb_g_resume(struct musb *musb)
 		break;
 	default:
 		WARNING("unhandled RESUME transition (%s)\n",
-				otg_state_string(musb));
+				otg_state_string(musb->xceiv->state));
 	}
 }
 
@@ -2069,7 +2070,7 @@ void musb_g_suspend(struct musb *musb)
 		 * A_PERIPHERAL may need care too
 		 */
 		WARNING("unhandled SUSPEND transition (%s)\n",
-				otg_state_string(musb));
+				otg_state_string(musb->xceiv->state));
 	}
 }
 
@@ -2104,7 +2105,7 @@ void musb_g_disconnect(struct musb *musb)
 	default:
 #ifdef	CONFIG_USB_MUSB_OTG
 		DBG(2, "Unhandled disconnect %s, setting a_idle\n",
-			otg_state_string(musb));
+			otg_state_string(musb->xceiv->state));
 		musb->xceiv->state = OTG_STATE_A_IDLE;
 		MUSB_HST_MODE(musb);
 		break;

drivers/usb/musb/musb_host.c

@@ -2304,7 +2304,7 @@ static int musb_bus_suspend(struct usb_hcd *hcd)
 
 	if (musb->is_active) {
 		WARNING("trying to suspend as %s while active\n",
-				otg_state_string(musb));
+				otg_state_string(musb->xceiv->state));
 		return -EBUSY;
 	} else
 		return 0;

drivers/usb/musb/musb_virthub.c

@@ -98,7 +98,7 @@ static void musb_port_suspend(struct musb *musb, bool do_suspend)
 #endif
 		default:
 			DBG(1, "bogus rh suspend? %s\n",
-				otg_state_string(musb));
+				otg_state_string(musb->xceiv->state));
 		}
 	} else if (power & MUSB_POWER_SUSPENDM) {
 		power &= ~MUSB_POWER_SUSPENDM;
@@ -208,7 +208,8 @@ void musb_root_disconnect(struct musb *musb)
 		musb->xceiv->state = OTG_STATE_B_IDLE;
 		break;
 	default:
-		DBG(1, "host disconnect (%s)\n", otg_state_string(musb));
+		DBG(1, "host disconnect (%s)\n",
+			otg_state_string(musb->xceiv->state));
 	}
 }
 

drivers/usb/musb/omap2430.c

@@ -114,7 +114,8 @@ static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
 	/* Never idle if active, or when VBUS timeout is not set as host */
 	if (musb->is_active || ((musb->a_wait_bcon == 0)
 			&& (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
-		DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
+		DBG(4, "%s active, deleting timer\n",
+			otg_state_string(musb->xceiv->state));
 		del_timer(&musb_idle_timer);
 		last_timer = jiffies;
 		return;
@@ -131,7 +132,7 @@ static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout)
 	last_timer = timeout;
 
 	DBG(4, "%s inactive, for idle timer for %lu ms\n",
-		otg_state_string(musb),
+		otg_state_string(musb->xceiv->state),
 		(unsigned long)jiffies_to_msecs(timeout - jiffies));
 	mod_timer(&musb_idle_timer, timeout);
 }
@@ -195,7 +196,7 @@ static void omap2430_musb_set_vbus(struct musb *musb, int is_on)
 
 	DBG(1, "VBUS %s, devctl %02x "
 		/* otg %3x conf %08x prcm %08x */ "\n",
-		otg_state_string(musb),
+		otg_state_string(musb->xceiv->state),
 		musb_readb(musb->mregs, MUSB_DEVCTL));
 }
 

drivers/usb/musb/tusb6010.c

@@ -422,7 +422,7 @@ static void musb_do_idle(unsigned long _musb)
 			&& (musb->idle_timeout == 0
 				|| time_after(jiffies, musb->idle_timeout))) {
 			DBG(4, "Nothing connected %s, turning off VBUS\n",
-					otg_state_string(musb));
+					otg_state_string(musb->xceiv->state));
 		}
 		/* FALLTHROUGH */
 	case OTG_STATE_A_IDLE:
@@ -481,7 +481,8 @@ static void tusb_musb_try_idle(struct musb *musb, unsigned long timeout)
 	/* Never idle if active, or when VBUS timeout is not set as host */
 	if (musb->is_active || ((musb->a_wait_bcon == 0)
 			&& (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) {
-		DBG(4, "%s active, deleting timer\n", otg_state_string(musb));
+		DBG(4, "%s active, deleting timer\n",
+			otg_state_string(musb->xceiv->state));
 		del_timer(&musb_idle_timer);
 		last_timer = jiffies;
 		return;
@@ -498,7 +499,7 @@ static void tusb_musb_try_idle(struct musb *musb, unsigned long timeout)
 	last_timer = timeout;
 
 	DBG(4, "%s inactive, for idle timer for %lu ms\n",
-		otg_state_string(musb),
+		otg_state_string(musb->xceiv->state),
 		(unsigned long)jiffies_to_msecs(timeout - jiffies));
 	mod_timer(&musb_idle_timer, timeout);
 }
@@ -573,7 +574,7 @@ static void tusb_musb_set_vbus(struct musb *musb, int is_on)
 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 
 	DBG(1, "VBUS %s, devctl %02x otg %3x conf %08x prcm %08x\n",
-		otg_state_string(musb),
+		otg_state_string(musb->xceiv->state),
 		musb_readb(musb->mregs, MUSB_DEVCTL),
 		musb_readl(tbase, TUSB_DEV_OTG_STAT),
 		conf, prcm);
@@ -702,13 +703,13 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
 				musb->is_active = 0;
 			}
 			DBG(2, "vbus change, %s, otg %03x\n",
-				otg_state_string(musb), otg_stat);
+				otg_state_string(musb->xceiv->state), otg_stat);
 			idle_timeout = jiffies + (1 * HZ);
 			schedule_work(&musb->irq_work);
 
 		} else /* A-dev state machine */ {
 			DBG(2, "vbus change, %s, otg %03x\n",
-				otg_state_string(musb), otg_stat);
+				otg_state_string(musb->xceiv->state), otg_stat);
 
 			switch (musb->xceiv->state) {
 			case OTG_STATE_A_IDLE:
@@ -756,7 +757,8 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *tbase)
 	if (int_src & TUSB_INT_SRC_OTG_TIMEOUT) {
 		u8	devctl;
 
-		DBG(4, "%s timer, %03x\n", otg_state_string(musb), otg_stat);
+		DBG(4, "%s timer, %03x\n",
+			otg_state_string(musb->xceiv->state), otg_stat);
 
 		switch (musb->xceiv->state) {
 		case OTG_STATE_A_WAIT_VRISE:

include/linux/usb/otg.h

@@ -168,6 +168,7 @@ otg_shutdown(struct otg_transceiver *otg)
 #ifdef CONFIG_USB_OTG_UTILS
 extern struct otg_transceiver *otg_get_transceiver(void);
 extern void otg_put_transceiver(struct otg_transceiver *);
+extern const char *otg_state_string(enum usb_otg_state state);
 #else
 static inline struct otg_transceiver *otg_get_transceiver(void)
 {
@@ -177,6 +178,11 @@ static inline struct otg_transceiver *otg_get_transceiver(void)
 static inline void otg_put_transceiver(struct otg_transceiver *x)
 {
 }
+
+static inline const char *otg_state_string(enum usb_otg_state state)
+{
+	return NULL;
+}
 #endif
 
 /* Context: can sleep */
@@ -246,6 +252,5 @@ otg_unregister_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
 
 /* for OTG controller drivers (and maybe other stuff) */
 extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
-extern const char *otg_state_string(enum usb_otg_state state);
 
 #endif /* __LINUX_USB_OTG_H */